All-solid-state battery, preparation method thereof, battery pack and vehicle

Abstract

The invention relates to an all-solid-state battery, a preparation method thereof, a battery pack and a vehicle, and belongs to the technical field of batteries. The all-solid-state battery comprises a plurality of material area pole groups, a plurality of first current collectors and a plurality of second current collectors, each material area pole group comprises a positive electrode material area, a solid electrolyte and a negative electrode material area which are sequentially pressed together, and the plurality of material area pole groups are sequentially stacked along a first direction; a first current collector or a second current collector is arranged between every two adjacent material area pole groups, the two ends of the plurality of material area pole groups along the first direction are respectively provided with a first current collector or a second current collector, the first current collectors are attached to the positive material areas of the material area pole groups, and the second current collectors are attached to the negative material areas of the material area pole groups. And the second current collector is attached to the negative electrode material area of the material area pole group. According to the all-solid-state battery and the preparation method thereof, the battery pack and the vehicle disclosed by the invention, the damage to the current collector when the all-solid-state battery is pressed by adopting an isostatic pressing technology can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and particularly to an all-solid-state battery, a preparation method thereof, a battery pack, and a vehicle. Background Art

[0002] During the production process of all-solid-state batteries, generally, a positive electrode sheet, a solid electrolyte, and a negative electrode sheet are stacked together for assembly. In order to form a good solid-solid contact interface between the solid electrolyte and the electrode and avoid problems such as contact loss and lithium dendrite formation during cycling, it is necessary to apply high pressure during stacking to make the materials densely packed.

[0003] Based on Pascal's principle, the isostatic pressing technology places the powder of the workpiece to be pressed in a high-pressure container and uses the properties of the incompressibility and uniform pressure transmission of liquid or gas media to uniformly press the workpiece from all directions, so that the powder is subjected to the same pressure in all directions, thereby realizing the forming of a green body with high density and high uniformity. For all-solid-state batteries, the isostatic pressing technology can effectively eliminate the voids inside the battery, improve the contact effect between the internal components of the battery, and then enhance the conductivity and increase the energy density.

[0004] However, when using the isostatic pressing technology to press all-solid-state batteries, since current collectors such as copper foils and aluminum foils cannot be compressed synchronously with the material area, after the material area shrinks and the gap between the sheets decreases, it is easy to cause foil damage and electrode sheet material loss. Therefore, the short-circuit probability of the prepared multi-layer solid-state battery is relatively high, and the production rate is low. Summary of the Invention

[0005] In view of this, the embodiments of the present disclosure provide an all-solid-state battery, a preparation method thereof, a battery pack, and a vehicle, which can reduce the damage to the current collector when using the isostatic pressing technology to press all-solid-state batteries. The technical solutions are as follows:

[0006] In a first aspect, an all-solid-state battery is provided. The all-solid-state battery includes a plurality of material area electrode groups, a plurality of first current collectors, and a plurality of second current collectors;

[0007] The material area electrode group includes a positive electrode material area, a solid electrolyte, and a negative electrode material area pressed together, and the solid electrolyte is located between the positive electrode material area and the negative electrode material area. The plurality of material area electrode groups are stacked in sequence along a first direction, and there is one of the first current collectors or one of the second current collectors between every two adjacent material area electrode groups, and one of the first current collectors or one of the second current collectors is respectively provided at both ends of the plurality of material area electrode groups along the first direction;

[0008] Wherein, the first current collector is attached to the positive electrode material area of the material area electrode group, and the second current collector is attached to the negative electrode material area of the material area electrode group.

[0009] In a possible implementation, the projection of the positive electrode material region of the material region electrode group along the first direction is located inside the projection of the solid electrolyte along the first direction.

[0010] In a possible implementation, the material region electrode group further includes a first insulating adhesive, and the first insulating adhesive is coated on the outer edge of the positive electrode material region.

[0011] In a possible implementation, the plurality of first current collectors are connected in sequence to form a continuously extending serpentine structure;

[0012] Or,

[0013] The plurality of second current collectors are connected in sequence to form a continuously extending serpentine structure.

[0014] In a possible implementation, the plurality of first current collectors are connected in sequence to form a continuously extending serpentine structure, and the thickness of the first current collector is less than the thickness of the second current collector;

[0015] Or,

[0016] The plurality of second current collectors are connected in sequence to form a continuously extending serpentine structure, and the thickness of the second current collector is less than the thickness of the first current collector.

[0017] In a possible implementation, the plurality of first current collectors are connected in sequence to form a continuously extending serpentine structure. The continuous structure extends along the second direction from the first side of the corresponding two material region electrode groups to between the corresponding two positive electrode material regions, and extends out from the second side of the corresponding two material region electrode groups. Moreover, the first end of the first current collector along the third direction extends out from between the corresponding two positive electrode material regions, and the second end of the second current collector along the third direction extends out from between the corresponding two positive electrode material regions;

[0018] Or,

[0019] The plurality of second current collectors are connected in sequence to form a continuously extending serpentine structure. The continuous structure extends along the second direction from the first side of the corresponding two material region electrode groups to between the corresponding two negative electrode material regions, and extends out from the second side of the corresponding two material region electrode groups. Moreover, the first end of the second current collector along the third direction extends out from between the corresponding two negative electrode material regions, and the second end of the first current collector along the third direction extends out from between the corresponding two negative electrode material regions; [[ID=�2]]

[0020] Wherein, the second direction is perpendicular to the third direction, and both the second direction and the third direction are perpendicular to the first direction.

[0021] In a possible implementation, the all-solid-state battery further includes a second insulating adhesive. The first end of the continuous structure in the third direction extends beyond the electrode stack in the material region, and the second insulating adhesive is coated at least on the second end of the electrode stack in the material region and the second end of the continuous structure in the third direction.

[0022] In a second aspect, a method for manufacturing an all-solid-state battery is provided. The manufacturing method is used to manufacture the all-solid-state battery according to any one of the first aspect, and includes the following steps:

[0023] Step a includes: sequentially stacking the positive electrode material region, the solid electrolyte, and the negative electrode material region and then pressing them to obtain the electrode stack in the material region;

[0024] Step b includes: sequentially stacking a plurality of the electrode stacks in the material region, a plurality of the first current collectors, and a plurality of the second current collectors in a cyclic manner along the first direction in the order of one electrode stack in the material region, one first current collector, one electrode stack in the material region, and one second current collector to form a laminate;

[0025] Step c includes: welding the positive electrode tab and the negative electrode tab on the laminate, encapsulating it with an aluminum-plastic film, and then performing isostatic pressing on the laminate to obtain the all-solid-state battery.

[0026] In a possible implementation, the projections of the positive electrode material region, the solid electrolyte, and the negative electrode material region used to manufacture the electrode stack in the material region coincide in the first direction. The manufacturing method further includes the following steps:

[0027] Step d includes: using a laser to cut the outer edge of each positive electrode material region so that the projection of the positive electrode material region of each electrode stack in the material region in the first direction is located inside the projection of the corresponding solid electrolyte in the first direction;

[0028] Wherein, the thickness of the positive electrode material region ≤ the thickness of the laser cutting < the thickness of the positive electrode material region + the thickness of the solid electrolyte;

[0029] Wherein, step d is located between step a and step b.

[0030] In a possible implementation, step b further includes:

[0031] After stacking one electrode stack in the material region each time, at least coat the second insulating adhesive on the second end of the corresponding electrode stack in the third direction.

[0032] In a third aspect, a battery pack is provided. The battery pack includes the all-solid-state battery according to any one of the second aspect.

[0033] Fourthly, a vehicle is provided, which includes the battery pack as described in the third aspect.

[0034] In the solution shown in the present disclosure, a plurality of material area electrode groups, a plurality of first current collectors, and a plurality of second current collectors can be pressed together by an isostatic pressing technique. Moreover, since the material area electrode group includes a positive electrode material area, a solid electrolyte, and a negative electrode material area that are pre-pressed together, the voids inside the material area electrode group have been somewhat eliminated, and at the same time, the volume of the material area electrode group has been reduced. Therefore, the areas of the first current collector and the second current collector can be relatively small. Meanwhile, when the isostatic pressing technique is used to press the material area electrode group together with the first current collector and the second current collector, the shrinkage of the material area electrode group and the reduction of the voids in the material area electrode group can be reduced, thereby reducing the damage to the first current collector and the second current collector. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of the first all-solid-state battery provided by the embodiment of the present disclosure;

[0037] Figure 2 is a schematic structural diagram of a material area electrode group provided by the embodiment of the present disclosure;

[0038] Figure 3 is a schematic top view structural diagram of a material area electrode group provided by the embodiment of the present disclosure;

[0039] Figure 4 is a schematic structural diagram of the second all-solid-state battery provided by the embodiment of the present disclosure;

[0040] Figure 5 is a schematic front view structural diagram of the second all-solid-state battery with a tape pasted thereon provided by the embodiment of the present disclosure;

[0041] Figure 6 is a provided by the embodiment of the present disclosure Figure 5 partial enlarged structural diagram B;

[0042] Figure 7 is a provided by the embodiment of the present disclosure Figure 5 A-A sectional structural diagram;

[0043] Figure 8 is a provided by the embodiment of the present disclosure Figure 7 partial enlarged structural diagram C;

[0044] Figure 9 is a schematic flow chart of a preparation method of a all - solid - state battery provided by an embodiment of the present disclosure;

[0045] Figure 10 is a schematic diagram of the preparation process of a material area electrode group provided by an embodiment of the present disclosure;

[0046] Figure 11 is a schematic diagram of the preparation process of a all - solid - state battery provided by an embodiment of the present disclosure.

[0047] Explanation of reference numerals

[0048] 1. Material area electrode group; 11. Positive electrode material area; 12. Solid - state electrolyte; 13. Negative electrode material area; 14. First insulating glue; 2. First current collector; 3. Second current collector; 4. Laminate; 6. Continuous structure; 7. Second insulating glue; 8. Tape.

[0049] 501. Step a; 502. Step b; 503. Step c; 504. Step d; 505. Step e; 506. Step f. Detailed implementation manners

[0050] To make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0051] In a first aspect, this embodiment relates to a all - solid - state battery. Referring to Figure 1 as shown, the all - solid - state battery includes a plurality of material area electrode groups 1, a plurality of first current collectors 2 and a plurality of second current collectors 3. Among them, referring to Figure 2 as shown, the material area electrode group 1 includes a positive electrode material area 11, a solid - state electrolyte 12 and a negative electrode material area 13 pressed together, and the solid - state electrolyte 12 is located between the positive electrode material area 11 and the negative electrode material area 13. Thus, the material area electrode group 1 has a smaller volume and fewer gaps due to being pressurized once. Among them, the positive electrode material area 11 generally includes positive electrode active materials, binders, conductive agents, etc., and can form a positive electrode sheet with a positive electrode current collector. The negative electrode material area 13 generally includes negative electrode active materials, binders, conductive agents, etc., and can form a negative electrode sheet with a negative electrode current collector.

[0052] Continuing to refer to Figure 1 as shown, the plurality of material area electrode groups 1 are stacked in sequence along a first direction, and there is a first current collector 2 or a second current collector 3 between every two adjacent material area electrode groups 1, and there is a first current collector 2 or a second current collector 3 at both ends of the plurality of material area electrode groups 1 along the first direction respectively.

[0053] Among them, the first current collector 2 is attached to the positive electrode material area 11 of the material area electrode group 1, and the second current collector 3 is attached to the negative electrode material area 13 of the material area electrode group 1. For example, the first current collector 2 can be aluminum foil, and the second current collector 2 can be copper foil.

[0054] For example Figure 1 As shown, in order to make the first current collector 2 attached to the positive electrode material area 11 of the material area electrode group 1, correspondingly, one side of the positive electrode material areas 11 of the two material area electrode groups 1 adjacent to the first current collector 2 can face each other, so that the corresponding first current collector 2 can be clamped between the two positive electrode material areas 11.

[0055] Moreover, one end of the plurality of material area electrode groups 1 in the first direction can be the positive electrode material area 11. At the same time, a first current collector 2 can be located at the corresponding end of the plurality of material area electrode groups 1 in the first direction and attached to the corresponding positive electrode material area 11. Both ends of the plurality of material area electrode groups 1 in the first direction can also be the positive electrode material areas 11, then the two first current collectors 2 can be respectively located at both ends of the plurality of material area electrode groups 1 in the first direction and attached to the corresponding positive electrode material areas 11.

[0056] At the same time, in order to make the second current collector 3 attached to the negative electrode material area 13 of the material area electrode group 1, correspondingly, one side of the negative electrode material areas 13 of the two material area electrode groups 1 adjacent to the second current collector 3 can face each other, so that the corresponding second current collector 3 can be clamped between the two negative electrode material areas 13.

[0057] Moreover, one end of the plurality of material area electrode groups 1 in the first direction can be the negative electrode material area 13. At the same time, a second current collector 3 can be located at the corresponding end of the plurality of material area electrode groups 1 in the first direction and attached to the corresponding negative electrode material area 13. Both ends of the plurality of material area electrode groups 1 in the first direction can also be the negative electrode material areas 13, then the two second current collectors 3 can be respectively located at both ends of the plurality of material area electrode groups 1 in the first direction and attached to the corresponding negative electrode material areas 13.

[0058] As described above, the plurality of material area electrode groups 1, the plurality of first current collectors 2 and the plurality of second current collectors 3 can be pressed together by isostatic pressing technology. And since the material area electrode group 1 includes the positive electrode material area 11, the solid electrolyte 12 and the negative electrode material area 13 pre-pressed together, the voids inside the material area electrode group 1 have been somewhat eliminated, and at the same time the volume of the material area electrode group 1 has been reduced. Therefore, the areas of the first current collector 2 and the second current collector 3 can be smaller. At the same time, when isostatic pressing technology is used to press the material area electrode group 1 together with the first current collector 2 and the second current collector 3, the shrinkage of the material area electrode group 1 and the reduction of the voids in the material area electrode group 1 can be reduced, so that the damage to the first current collector 2 and the second current collector 3 is reduced.

[0059] In one example, referring to Figure 2 Combined with Figure 3As shown, the projection of the positive electrode material area 11 of the material area electrode group 1 in the first direction is located inside the projection of the solid electrolyte 12 in the first direction. For example, the area of the positive electrode material area 11 can be smaller than the areas of the solid electrolyte 12 and the negative electrode material area 13.

[0060] Thus, the solid electrolyte 12 can separate the positive electrode material area 11 from the negative electrode material area 13, and the positive electrode material area 11 and the negative electrode material area 13 will not come into contact to cause a short circuit. At the same time, it can prevent the problem of lithium deposition caused by the lack of a position for the lithium ions inserted into the negative electrode during the charging process, resulting in the decline of the all-solid-state battery and a significant shortening of the cycle life.

[0061] In one example, continue to refer to Figure 2 Combined with Figure 3 As shown, the material area electrode group 1 further includes a first insulating adhesive 14, and the first insulating adhesive 14 is coated on the outer edge of the positive electrode material area 11.

[0062] Since the material area electrode group 1 also needs to be subjected to isostatic pressing together with the first current collector 2 and the second current collector 3, during the pressing process, the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 will also have a certain deformation in the plane perpendicular to the first direction, and there may be a risk of contact between the positive electrode material area 11 and the negative electrode material area 13. By coating the first insulating adhesive 14 on the outer edge of the positive electrode material area 11, it is beneficial to prevent contact between the positive electrode material area 11 and the negative electrode material area 13 after deformation.

[0063] At the same time, the first insulating adhesive 14 can fill the outer edge of the positive electrode material area 11 to play an adhesion role. When performing the joint pressing of the material area electrode group 1 with the first current collector 2 and the second current collector 3, it can prevent the risk of misalignment that may be caused by the difference in the area of the positive electrode material area 11 from the areas of the solid electrolyte 12 and the negative electrode material area 13.

[0064] In one example, refer to Figure 4 As shown, a plurality of first current collectors 2 can be connected in sequence to form a continuous structure 6 extending in a serpentine shape, or a plurality of second current collectors 3 can be connected in sequence to form a continuous structure 6 extending in a serpentine shape. For example, in Figure 4 it can be that a plurality of second current collectors 3 are connected in sequence to form a continuous structure 6 extending in a serpentine shape, but it can also be that a plurality of first current collectors 2 are connected in sequence to form a continuous structure 6 extending in a serpentine shape.

[0065] In this way, the continuous structure 6 can play the role of replacing the continuous separator in the traditional lithium battery, improve the stacking efficiency of the material area electrode group 1, the first current collector 2, and the second current collector 3, realize continuous production, and at the same time is beneficial to preventing misalignment during the stacking and pressing of the material area electrode group 1, the first current collector 2, and the second current collector 3.

[0066] Such as Figure 4As shown, in this embodiment, taking the second current collector 2 as a copper foil and a plurality of second current collectors 3 being connected in sequence to form a continuous structure 6 extending in a serpentine shape as an example. The continuous structure 6 can be a continuous copper foil.

[0067] In one example, it can be that a plurality of first current collectors 2 are connected in sequence to form a continuous structure 6 extending in a serpentine shape, and the thickness of the first current collector 2 is less than the thickness of the second current collector 3.

[0068] Or it can be that a plurality of second current collectors 3 are connected in sequence to form a continuous structure 6 extending in a serpentine shape, and the thickness of the second current collector 3 is less than the thickness of the first current collector 2.

[0069] In this way, using the thinner current collector among the first current collector 2 and the second current collector 3 to form the continuous structure 6 is beneficial to avoiding deformation problems such as wrinkles and folding of the thinner current collector before stacking and pressing, and improving the quality of the all-solid-state battery.

[0070] For example Figure 4 As shown, taking the first current collector 2 as an aluminum foil and the second current collector 2 as a copper foil as an example. The thickness of the copper foil can be less than the thickness of the aluminum foil. Thus, it can be that a plurality of second current collectors 3 are connected in sequence to form a continuous structure 6 extending in a serpentine shape.

[0071] In one example, it can be that a plurality of first current collectors 2 are connected in sequence to form a continuous structure 6 extending in a serpentine shape. The continuous structure 6 extends from the first side of the corresponding two material area electrode groups 1 to between the corresponding two positive electrode material areas 11 in the second direction, and extends out from the second side of the corresponding two material area electrode groups 1. And the first end of the first current collector 2 in the third direction extends out from between the corresponding two positive electrode material areas 11, and the second end of the second current collector 3 in the third direction extends out from between the corresponding two negative electrode material areas 13.

[0072] However, in Figures 5 to 8 it can also be that a plurality of second current collectors 3 are connected in sequence to form a continuous structure 6 extending in a serpentine shape. As shown in Figure 7 and Figure 8 shown, the continuous structure 6 can extend from the first side of the corresponding two material area electrode groups 1 to between the corresponding two negative electrode material areas 13 in the second direction, and extend out from the second side of the corresponding two material area electrode groups 1. And as shown in Figure 5 and Figure 6 shown, the first end of the second current collector 3 in the third direction extends out from between the corresponding two negative electrode material areas 13, and the second end of the first current collector 2 in the third direction extends out from between the corresponding two positive electrode material areas 11.

[0073] Wherein, the second direction and the third direction are perpendicular to each other, and both the second direction and the third direction are perpendicular to the first direction.

[0074] Thus, the positive electrode tab and the negative electrode tab can be welded at the first end and the second end of the all-solid-state battery along the third direction respectively, which can avoid short circuit between the positive electrode tab and the negative electrode tab.

[0075] In one example, it can be that a plurality of first current collectors 2 are connected in sequence to form a continuous structure 6 extending in a serpentine shape. The continuous structure 6 can extend beyond the material area electrode group 1 at the first end along the third direction, and the second current collector 3 extends out from between two corresponding negative electrode material areas 13 at the second end along the third direction.

[0076] Or it can be that a plurality of second current collectors 3 are connected in sequence to form a continuous structure 6 extending in a serpentine shape. The continuous structure 6 can extend beyond the material area electrode group 1 at the first end along the third direction, and the first current collector 2 extends out from between two corresponding positive electrode material areas 11 at the second end along the third direction.

[0077] For example Figures 5 to 8 As shown, a plurality of second current collectors 3 can be connected in sequence to form a continuous structure 6 extending in a serpentine shape. The continuous structure 6 can be a continuous copper foil extending in a serpentine shape along the first direction. The part of the continuous copper foil in contact with the negative electrode material area 13 can be the second current collector 3. As Figure 5 shown, the continuous copper foil can extend beyond the material area electrode group 1 at the first end along the third direction, and the first current collector 2 extends out from between two corresponding positive electrode material areas 11 at the second end along the third direction. In this way, since the continuous structure 6 extends beyond the material area electrode group 1 as a whole along the third direction, therefore, mutual support can be generated between adjacent second current collectors 3 through the connected parts, which is beneficial to avoiding the part of the second current collector 3 extending beyond the material area electrode group 1 from being bent and contacting the positive electrode material area 11 or the first current collector 2 to cause short circuit.

[0078] In one example, referring to Figure 5 as shown, the all-solid-state battery further includes a second insulating adhesive 7. The continuous structure 6 extends beyond the material area electrode group 1 at the first end along the third direction, and the second insulating adhesive 7 is coated at least on the second end of the material area electrode group 1 along the third direction and the second end of the continuous structure 6 along the third direction.

[0079] For example, in Figure 5 it can be that a plurality of second current collectors 3 are connected in sequence to form a continuous structure 6 extending in a serpentine shape, and the first current collector 2 extends out from between two corresponding positive electrode material areas 11 at the second end along the third direction. The second insulating adhesive 7 can be coated on the second end of the material area electrode group 1 along the third direction and the second end of the continuous structure 6 along the third direction. In this way, it can be avoided that the part of the first current collector 2 extending out from between two corresponding positive electrode material areas 11 at the second end along the third direction contacts the negative electrode material area 13 or the second current collector 3 due to possible bending to cause short circuit.

[0080] In one example, in Figure 5In [the above], it can be that multiple second current collectors 3 are connected in sequence to form a continuously snake-shaped extending structure 6. The second insulating adhesive 7 can also be coated on the second end of the material area electrode assembly 1 along the third direction and the second end of the first current collector 2 along the third direction. This is more conducive to avoiding the part of the second current collector 3 beyond the material area electrode assembly 1 from being bent and coming into contact with the positive electrode material area 11 or the first current collector 2, thereby causing a short circuit.

[0081] It can also be that multiple first current collectors 2 are connected in sequence to form a continuously snake-shaped extending structure 6. The second insulating adhesive 7 can also be coated on the second end of the material area electrode assembly 1 along the third direction and the second end of the second current collector 3 along the third direction. This is more conducive to avoiding the part of the first current collector 2 beyond the material area electrode assembly 1 from being bent and coming into contact with the negative electrode material area 13 or the second current collector 3, thereby causing a short circuit.

[0082] In one example, the first insulating adhesive 14 and the second insulating adhesive 7 can be polyurethane.

[0083] In one example, the width of the first insulating adhesive 14 can be 0.5 mm to 4.0 mm. For example, the width of the first insulating adhesive 14 can be 0.5 mm, 1.5 mm, or 4 mm, etc.

[0084] In one example, the width of the second insulating adhesive 7 can be 0.5 mm to 4.0 mm. For example, the width of the first insulating adhesive 14 can be 0.5 mm, 1.5 mm, or 4 mm, etc.

[0085] In the embodiments of the present disclosure, multiple material area electrode assemblies 1, multiple first current collectors 2, and multiple second current collectors 3 can be pressed together by an isostatic pressing technique. And, since the material area electrode assembly 1 includes a positive electrode material area 11, a solid electrolyte 12, and a negative electrode material area 13 that are pre-pressed together, the voids inside the material area electrode assembly 1 have been somewhat eliminated, and at the same time, the volume of the material area electrode assembly 1 has been reduced. Thus, the areas of the first current collector 2 and the second current collector 3 can be smaller. At the same time, when using the isostatic pressing technique to jointly pressurize the material area electrode assembly 1 with the first current collector 2 and the second current collector 3, the shrinkage of the material area electrode assembly 1 and the reduction of the voids in the material area electrode assembly 1 can be reduced, thereby reducing the damage to the first current collector 2 and the second current collector 3.

[0086] In a second aspect, the embodiments of the present disclosure also provide a method for manufacturing an all-solid-state battery. Refer to Figures 9 to 11 as shown, the manufacturing method is used to manufacture any all-solid-state battery as shown in the present disclosure, and includes the following steps:

[0087] Step a501 includes: sequentially stacking the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 and then pressing them to obtain the material area electrode group 1. For example, the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 can be sequentially stacked and then pressed using isostatic pressing technology to obtain the material area electrode group 1; however, it is also possible to first roll the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 into sheets separately, and then sequentially stack them and press them using isostatic pressing technology to obtain the material area electrode group 1.

[0088] Reference Figure 11 As shown, step b502 includes: sequentially stacking multiple material area electrode groups 1, multiple first current collectors 2, and multiple second current collectors 3 in a cycle along the first direction in the order of one material area electrode group 1, one first current collector 2, one material area electrode group 1, and one second current collector 3 to form a laminate 4.

[0089] Step c503 includes: welding the positive electrode tab and the negative electrode tab on the laminate 4, encapsulating it with an aluminum-plastic film, and then performing isostatic pressing on the laminate 4 to obtain a all-solid-state battery.

[0090] In this embodiment, taking the example that multiple second current collectors 3 are sequentially connected to form a continuous structure 6 extending in a serpentine shape. The part of the first end of the second current collector 3 extending between the corresponding two negative electrode material areas 13 along the third direction can be welded together with a metal sheet to form a negative electrode tab. The part of the second end of the first current collector 2 extending between the corresponding two negative electrode material areas 13 along the third direction can be welded together with a metal sheet to form a negative electrode tab.

[0091] As described above, the damage to the first current collector 2 and the second current collector 3 of the all-solid-state battery prepared by the present disclosure can be reduced.

[0092] In one example, as Figure 10 shown, step a501 may further include cutting the material area electrode group 1 obtained by sequentially stacking and pressing the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 into the required size along the plane where the first direction is located. For example, the obtained larger-sized material area electrode group 1 can be cut into a material area electrode group 1 with a length of 320 mm and a width of 91 mm.

[0093] In one example, referring to Figure 10 shown, the projections of the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 used to prepare the material area electrode group 1 coincide along the first direction. Thus, the areas of the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 are equal, which can reduce the risk of misalignment of the positive electrode material area 11, the solid electrolyte 12, and the negative electrode material area 13 when pressing the material area electrode group 1, making it easier to press the material area electrode group 1 into shape.

[0094] The preparation method further includes the following steps:

[0095] Step d504 includes: cutting along the outer edge of each positive electrode material area 11 by using a laser, so that the projection of each positive electrode material area 11 of the electrode group 1 in the first direction is located inside the projection of the corresponding solid electrolyte 12 in the first direction. Thus, it is beneficial to avoid contact between the positive electrode material area 11 and the negative electrode material area 13 and short circuit.

[0096] Wherein, the thickness of the positive electrode material area 11 ≤ the thickness of the laser cutting < the thickness of the positive electrode material area 11 + the thickness of the solid electrolyte 12. In this way, it can be avoided that the solid electrolyte 12 is penetrated due to laser cutting, and the positive electrode material area 11 and the negative electrode material area 13 may come into contact and cause a short circuit.

[0097] Wherein, step d504 is located between step a501 and step b502. In this way, it is convenient for the laser to cut the outer edge of the positive electrode material area 11.

[0098] In one example, the cutting width of the laser on the outer edge of the positive electrode material area 11 can be 0.5 mm to 4.0 mm. For example, the cutting width of the laser on the outer edge of the positive electrode material area 11 can be 0.5 mm, 1.5 mm or 4 mm, etc. The first insulating glue 14 can be applied to the area cut off by the laser on the outer edge of the positive electrode material area 11.

[0099] In one example, referring to Figure 9 As shown, step b502 further includes: after stacking one electrode group 1 in each material area each time, applying the second insulating glue 7 at least at the second end of the corresponding electrode group 1 in the third direction. In this way, it is beneficial to the continuous production of all-solid-state batteries, and at the same time, it is beneficial to avoid the misalignment of the electrode groups 1 in the material areas.

[0100] In one example, referring to Figure 9 As shown, the preparation method further includes the following steps:

[0101] Step e505 includes: applying the first insulating glue 14 on the outer edge of the positive electrode material area 11.

[0102] Wherein, step e505 is located between step d504 and step b502. In this way, the application of the first insulating glue 14 can be carried out more conveniently.

[0103] In one example, referring to Figure 9 As shown, the preparation method further includes the following steps:

[0104] Step f506 includes: pressing the laminate 4 in the first direction. For example, pressure can be applied at both ends of the laminate 4 in the first direction, which helps to prevent the laminate 4 from coming loose. And tapes 8 are pasted at both ends of the laminate 4 in the second direction. The tapes 8 extend from the first end of the laminate 4 in the first direction to the second end of the laminate 4 in the first direction. Thus, it is convenient to move the laminate 4 and facilitate the subsequent steps.

[0105] Among them, step f506 is located between step b502 and step c503.

[0106] In one example, multiple first current collectors 2 are connected in sequence to form a continuously serpentine structure 6. After each feeding of the second current collector 3, the excess material can be cut off using a laser, so that the second current collector 3 can be a single sheet.

[0107] In the embodiments of the present disclosure, multiple material area electrode groups 1, multiple first current collectors 2, and multiple second current collectors 3 can be pressed together using isostatic pressing technology. And since the material area electrode group 1 includes a positive electrode material area 11, a solid electrolyte 12, and a negative electrode material area 13 that are pre-pressed together, the voids inside the material area electrode group 1 have been somewhat eliminated, and at the same time, the volume of the material area electrode group 1 has been reduced. Therefore, the areas of the first current collector 2 and the second current collector 3 can be smaller. At the same time, when using isostatic pressing technology to jointly press the material area electrode group 1 with the first current collector 2 and the second current collector 3, the shrinkage of the material area electrode group 1 and the reduction of the voids in the material area electrode group 1 can be reduced, thereby reducing the damage to the first current collector 2 and the second current collector 3.

[0108] The following is a comparison between preparing a all-solid-state battery using the present disclosure and preparing a all-solid-state battery using the current process method.

[0109] Example 1 of the preparation method of the all-solid-state battery using the present disclosure:

[0110] A material area electrode group 1 is made by isostatic pressing using a positive electrode material area 11 with a single-sided areal capacity of 5.48 mAh / cm², a solid electrolyte 12 with a thickness of 50 μm, and a negative electrode material area 13 with a single-sided areal capacity of 6.03 mAh / cm². The thickness of the material area electrode group 1 is 0.296 mm, the length is 320 mm, and the width is 91 mm. The width of the outer edge of the positive electrode material area 11 cut by laser is 1.5 mm. After laser cutting, the length of the positive electrode material area 11 is 317 mm and the width is 88 mm.

[0111] An aluminum foil is used as the first current collector 2, a copper foil is used as the second current collector 3, and the continuous structure 6 can be a continuous copper foil. The thickness of the copper foil is 10 μm and the width is 332 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 88 mm.

[0112] The width of the first insulating adhesive 14 is 1.5 mm, and the width of the second insulating adhesive 7 is 1.5 mm.

[0113] Example 2 of the preparation method of the all-solid-state battery of the present disclosure:

[0114] The positive electrode material region 11 with a single-sided areal capacity of 5.48 mAh / cm², the solid electrolyte 12 with a thickness of 50 μm, and the negative electrode material region 13 with a single-sided areal capacity of 6.03 mAh / cm² are made into the material region electrode group 1 by isostatic pressing. The thickness of the material region electrode group 1 is 0.296 mm, the length is 320 mm, and the width is 91 mm. The width of the outer edge of the positive electrode material region 11 cut by laser is 1.5 mm. After laser cutting, the length of the positive electrode material region 11 is 317 mm and the width is 88 mm.

[0115] Aluminum foil is used as the first current collector 2, copper foil is used as the second current collector 3, and the continuous structure 6 can be a continuous copper foil. The thickness of the copper foil is 10 μm and the width is 332 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 88 mm.

[0116] The width of the first insulating adhesive 14 is 1.5 mm, and the width of the second insulating adhesive 7 is 0.5 mm.

[0117] Example 3 of the preparation method of the all-solid-state battery of the present disclosure:

[0118] The positive electrode material region 11 with a single-sided areal capacity of 5.48 mAh / cm², the solid electrolyte 12 with a thickness of 50 μm, and the negative electrode material region 13 with a single-sided areal capacity of 6.03 mAh / cm² are made into the material region electrode group 1 by isostatic pressing. The thickness of the material region electrode group 1 is 0.296 mm, the length is 320 mm, and the width is 91 mm. The width of the outer edge of the positive electrode material region 11 cut by laser is 0.5 mm. After laser cutting, the length of the positive electrode material region 11 is 319 mm and the width is 90 mm.

[0119] Aluminum foil is used as the first current collector 2, copper foil is used as the second current collector 3, and the continuous structure 6 can be a continuous copper foil. The thickness of the copper foil is 10 μm and the width is 332 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 90 mm.

[0120] The width of the first insulating adhesive 14 is 0.5 mm, and the width of the second insulating adhesive 7 is 1.5 mm.

[0121] Example 4 of the preparation method of the all-solid-state battery of the present disclosure:

[0122] The positive electrode material region 11 with a single-sided areal capacity of 5.48 mAh / cm², the solid electrolyte 12 with a thickness of 50 μm, and the negative electrode material region 13 with a single-sided areal capacity of 6.03 mAh / cm² are made into the material region electrode group 1 by isostatic pressing. The thickness of the material region electrode group 1 is 0.296 mm, the length is 320 mm, and the width is 91 mm. The width of the outer edge of the positive electrode material region 11 cut by laser is 0.5 mm. After laser cutting, the length of the positive electrode material region 11 is 319 mm and the width is 90 mm.

[0123] Aluminum foil is used as the first current collector 2, copper foil is used as the second current collector 3, and the continuous structure 6 can be continuous copper foil. The thickness of the copper foil is 10 μm and the width is 332 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 90 mm.

[0124] The width of the first insulating adhesive 14 is 0.5 mm, and the width of the second insulating adhesive 7 is 0.5 mm.

[0125] Example 5 of the preparation method of the all-solid-state battery of the present disclosure is adopted:

[0126] The positive electrode material region 11 with a single-sided areal capacity of 5.48 mAh / cm², the solid electrolyte 12 with a thickness of 50 μm, and the negative electrode material region 13 with a single-sided areal capacity of 6.03 mAh / cm² are made into the material region electrode group 1 by isostatic pressing. The thickness of the material region electrode group 1 is 0.296 mm, the length is 320 mm, and the width is 91 mm. The width of the outer edge of the positive electrode material region 11 cut by laser is 0.5 mm. After laser cutting, the length of the positive electrode material region 11 is 319 mm and the width is 90 mm.

[0127] Aluminum foil is used as the first current collector 2, copper foil is used as the second current collector 3, and the continuous structure 6 can be continuous copper foil. The thickness of the copper foil is 10 μm and the width is 332 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 90 mm.

[0128] The width of the first insulating adhesive 14 is 0.5 mm, and the width of the second insulating adhesive 7 is 4 mm.

[0129] Example 6 of the preparation method of the all-solid-state battery of the present disclosure is adopted:

[0130] The positive electrode material region 11 with a single-sided areal capacity of 5.48 mAh / cm², the solid electrolyte 12 with a thickness of 50 μm, and the negative electrode material region 13 with a single-sided areal capacity of 6.03 mAh / cm² are made into the material region electrode group 1 by isostatic pressing. The thickness of the material region electrode group 1 is 0.296 mm, the length is 320 mm, and the width is 91 mm. The width of the outer edge of the positive electrode material region 11 cut by laser is 4 mm. After laser cutting, the length of the positive electrode material region 11 is 312 mm and the width is 83 mm.

[0131] The aluminum foil is used as the first current collector 2, and the copper foil is used as the second current collector 3. The continuous structure 6 can be a continuous copper foil. The thickness of the copper foil is 10 μm, and the width is 332 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 83 mm.

[0132] The width of the first insulating adhesive 14 is 4 mm, and the width of the second insulating adhesive 7 is 4 mm.

[0133] Comparative example using the current process method:

[0134] The positive electrode sheet with a single-sided areal capacity of 5.48 mAh / cm², the solid electrolyte sheet with a thickness of 50 μm, and the negative electrode sheet with a single-sided areal capacity of 6.03 mAh / cm² are respectively isostatically pressed. After pressing, the thickness of the positive electrode sheet is 151 μm, and the thickness of the negative electrode sheet is 80 μm. The widths of the negative electrode sheet and the solid electrolyte sheet are both 91 mm, and the lengths are both 320 mm. The width of the positive electrode sheet is 88 mm, and the length is 317 mm. The overhang of the part of the negative electrode sheet exceeding the positive electrode sheet is 1.5 mm.

[0135] The aluminum foil is used as the negative current collector, and the copper foil is used as the positive current collector. The thickness of the copper foil is 10 μm, the width is 332 mm, and the length is 91 mm. The thickness of the aluminum foil is 12 μm, the width is 332 mm, and the length is 88 mm.

[0136] The following is a comparison of the technical indicators between the all-solid-state batteries prepared in Examples 1 to 6 and the comparative example.

[0137]

[0138] Thirdly, the embodiments of the present disclosure further provide a battery pack, which includes the all-solid-state battery according to any one of the second aspects.

[0139] In the embodiments of the present disclosure, a plurality of material area electrode groups 1, a plurality of first current collectors 2, and a plurality of second current collectors 3 can be pressed together by isostatic pressing technology. And, since the material area electrode group 1 includes a positive electrode material area 11, a solid electrolyte 12, and a negative electrode material area 13 that are pre-pressed together, the voids inside the material area electrode group 1 have been partially eliminated, and at the same time, the volume of the material area electrode group 1 has been reduced. Therefore, the areas of the first current collector 2 and the second current collector 3 can be smaller. At the same time, when isostatic pressing technology is used to jointly press the material area electrode group 1 with the first current collector 2 and the second current collector 3, the shrinkage of the material area electrode group 1 and the reduction of the voids in the material area electrode group 1 can be reduced, so that the damage to the first current collector 2 and the second current collector 3 is reduced.

[0140] Fourthly, the embodiments of the present disclosure further provide a vehicle, which includes the battery pack according to the third aspect.

[0141] In the embodiments of the present disclosure, a plurality of material area electrode groups 1, a plurality of first current collectors 2, and a plurality of second current collectors 3 can be pressed together by an isostatic pressing technique. Moreover, since the material area electrode group 1 includes a positive electrode material area 11, a solid electrolyte 12, and a negative electrode material area 13 that are pre-pressed together, the voids inside the material area electrode group 1 have been somewhat eliminated, and at the same time, the volume of the material area electrode group 1 has been reduced. Therefore, the areas of the first current collector 2 and the second current collector 3 can be smaller. Meanwhile, when using the isostatic pressing technique to apply pressure to the material area electrode group 1, the first current collector 2, and the second current collector 3 together, the shrinkage of the material area electrode group 1 and the reduction of the voids in the material area electrode group 1 can be reduced, thereby reducing the damage suffered by the first current collector 2 and the second current collector 3.

[0142] It should be noted that in the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0143] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise clearly specifically limited.

[0144] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of this application.

[0145] The above are only the embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the principles of this application shall be included in the protection scope of this application.

Claims

1. A all-solid-state battery, characterized in that, The all-solid-state battery includes a plurality of electrode groups in material regions (1), a plurality of first current collectors (2), and a plurality of second current collectors (3); The electrode group in the material region (1) includes a positive electrode material region (11), a solid electrolyte (12), and a negative electrode material region (13) pressed together, and the solid electrolyte (12) is located between the positive electrode material region (11) and the negative electrode material region (13). The plurality of electrode groups in the material regions (1) are stacked in sequence along a first direction, and there is one of the first current collectors (2) or one of the second current collectors (3) between every two adjacent electrode groups in the material regions (1), and one of the first current collectors (2) or one of the second current collectors (3) is respectively provided at both ends of the plurality of electrode groups in the material regions (1) along the first direction; Wherein, the first current collector (2) is in contact with the positive electrode material region (11) of the electrode group in the material region (1), and the second current collector (3) is in contact with the negative electrode material region (13) of the electrode group in the material region (1).

2. The all-solid-state battery according to claim 1, characterized in that, The projection of the positive electrode material region (11) of the electrode group in the material region (1) along the first direction is located inside the projection of the solid electrolyte (12) along the first direction.

3. The all-solid-state battery according to claim 2, characterized in that, The electrode group in the material region (1) further includes a first insulating adhesive (14), and the first insulating adhesive (14) is coated on the outer edge of the positive electrode material region (11).

4. The all-solid-state battery according to claim 1, wherein, The plurality of first current collectors (2) are connected in sequence to form a continuously structured (6) that extends in a serpentine shape; Or, The plurality of second current collectors (3) are connected in sequence to form a continuously structured (6) that extends in a serpentine shape.

5. The all-solid-state battery according to claim 4, characterized in that, The plurality of first current collectors (2) are connected in sequence to form a continuously structured (6) that extends in a serpentine shape, and the thickness of the first current collector (2) is less than the thickness of the second current collector (3); Or, The plurality of second current collectors (3) are connected in sequence to form a continuously structured (6) that extends in a serpentine shape, and the thickness of the second current collector (3) is less than the thickness of the first current collector (2).

6. The all-solid-state battery according to claim 4, characterized in that, The plurality of first current collectors (2) are connected in sequence to form a continuously structured (6) that extends in a serpentine shape. The continuously structured (6) extends from the first side of the corresponding two electrode groups in the material regions (1) to between the corresponding two positive electrode material regions (11) along a second direction, and extends out from the second side of the corresponding two electrode groups in the material regions (1), and the first end of the first current collector (2) along a third direction extends out from between the corresponding two positive electrode material regions (11), and the second end of the second current collector (3) along the third direction extends out from between the corresponding two positive electrode material regions (11); Or, The plurality of second current collectors (3) are connected in sequence to form a continuously structured (6) that extends in a serpentine shape. The continuously structured (6) extends from the first side of the corresponding two electrode groups in the material regions (1) to between the corresponding two negative electrode material regions (13) along the second direction, and extends out from the second side of the corresponding two electrode groups in the material regions (1), and the first end of the second current collector (3) along the third direction extends out from between the corresponding two negative electrode material regions (13), and the second end of the first current collector (2) along the third direction extends out from between the corresponding two negative electrode material regions (13); Wherein, the second direction is perpendicular to the third direction, and both the second direction and the third direction are perpendicular to the first direction.

7. The all-solid-state battery according to claim 6, wherein The all-solid-state battery further includes a second insulating adhesive (7). The first end of the continuous structure (6) in the third direction extends beyond the material region electrode group (1), and the second insulating adhesive (7) is coated at least on the second end of the material region electrode group (1) in the third direction and the second end of the continuous structure (6) in the third direction.

8. A method for preparing an all-solid-state battery, characterized in that, The preparation method is used to prepare the all-solid-state battery according to any one of claims 1 to 7, and includes the following steps: Step a (501), including: sequentially stacking the positive electrode material region (11), the solid electrolyte (12), and the negative electrode material region (13) and then pressing them to obtain the material region electrode group (1); Step b (502), including: cyclically stacking a plurality of the material region electrode groups (1), a plurality of the first current collectors (2), and a plurality of the second current collectors (3) in the first direction in the order of one material region electrode group (1), one first current collector (2), one material region electrode group (1), and one second current collector (3) to form a laminate (4); Step c (503), including: welding positive and negative electrode tabs on the laminate (4), encapsulating with an aluminum-plastic film, and then performing isostatic pressing on the laminate (4) to obtain the all-solid-state battery.

9. The preparation method according to claim 8, characterized in that, The projections of the positive electrode material region (11), the solid electrolyte (12), and the negative electrode material region (13) used to prepare the material region electrode group (1) in the first direction coincide. The preparation method further includes the following steps: Step d (504), including: using a laser to cut the outer edge of each positive electrode material region (11) so that the projection of the positive electrode material region (11) of each material region electrode group (1) in the first direction is located inside the projection of the corresponding solid electrolyte (12) in the first direction; Wherein, the thickness of the positive electrode material region (11) ≤ the thickness of the laser cutting < the thickness of the positive electrode material region (11) + the thickness of the solid electrolyte (12); Wherein, step d (504) is located between step a (501) and step b (502).

10. The preparation method according to claim 9, characterized in that, Step b (502) further includes: After stacking one material region electrode group (1) each time, at least coat the second insulating adhesive (7) on the second end of the corresponding material region electrode group (1) in the third direction.

11. A battery pack, characterized in that, The battery pack includes the all-solid-state battery according to any one of claims 1 to 7.

12. A vehicle, characterized in that, The vehicle includes the battery pack according to claim 11.

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