A button-type lithium battery containing solid electrolyte and a method for manufacturing the same

Abstract

The invention discloses a button-type lithium battery containing a solid electrolyte and a manufacturing method thereof, comprising a battery core, wherein a positive electrode steel shell and a negative electrode steel shell are provided on the surface of the battery core, the battery core comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet comprises a positive electrode collector, a first positive electrode material layer and a second positive electrode material layer are coated on both sides of the positive electrode collector, the first positive electrode material layer is coated with a first solid electrolyte layer, the second positive electrode material layer is coated with a second solid electrolyte layer, the negative electrode sheet comprises a negative electrode collector, a first negative electrode material layer and a second negative electrode material layer are coated on both sides of the negative electrode collector, the first negative electrode material layer is coated with a third solid electrolyte layer, and the second negative electrode material layer is coated with a fourth solid electrolyte layer. The invention can improve the safety and energy density of the button-type lithium battery, and improve the charge and discharge rate of the solid-state battery, and the manufacturing method is simple and practical, and has higher production efficiency and yield rate.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state lithium batteries, and in particular to a button-type lithium battery containing a solid electrolyte and a manufacturing method thereof. Background Art

[0002] Among the existing energy storage technologies, lithium-ion batteries have been widely used in consumer electronic products due to their advantages such as high energy density, high operating voltage, long service life and no memory effect. With the development of consumer electronic products, the miniaturization of batteries has become particularly important. Flexible, high-energy-density batteries have also continued to move forward with the rise of consumer electronic products. However, traditional lithium-ion batteries use flammable liquid organic electrolytes, which poses a safety hazard and has encountered a bottleneck in development. The use of solid-state electrolytes instead of organic liquid electrolytes will not only make new all-solid-state lithium batteries safer, but also have greater room for improving specific energy, specific power density and cycle performance. They are expected to become the next generation of lithium-ion batteries and the preferred energy source for consumer electronic products.

[0003] At present, the mass production of all-solid-state batteries is still very difficult and can only be produced in small batches. There are many problems with the manufacturing process. At this stage, there are still many problems to be solved in the safety and manufacturing process of button lithium batteries. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a button-type lithium battery containing a solid electrolyte and a method for manufacturing the same, which can improve the safety and energy density of the button-type lithium battery and increase the charge and discharge rate of the solid-state battery. The manufacturing method is simple and practical and has higher production efficiency and yield rate.

[0005] To achieve the above-mentioned purpose, the present invention provides a button-type lithium battery containing a solid electrolyte, comprising a battery cell, wherein a positive electrode steel shell is provided on one side of the battery cell, and a negative electrode steel shell is provided on the other side, wherein the battery cell is formed by stacking positive electrode sheets and negative electrode sheets alternately, wherein the positive electrode sheet comprises a positive electrode collector, wherein a first positive electrode material layer is coated on one side of the positive electrode collector, and a second positive electrode material layer is coated on the other side of the positive electrode collector, wherein a first solid electrolyte layer is coated on the first positive electrode material layer, and a second solid electrolyte layer is coated on the second positive electrode material layer, wherein a positive electrode tab is provided on the positive electrode collector, wherein the negative electrode sheet comprises a negative electrode collector, wherein a first negative electrode material layer is coated on one side of the negative electrode collector, and a second negative electrode material layer is coated on the other side of the negative electrode collector, wherein a third solid electrolyte layer is coated on the first negative electrode material layer, and a fourth solid electrolyte layer is coated on the second negative electrode material layer, and wherein a negative electrode tab is provided on the negative electrode collector.

[0006] Preferably, the negative electrode sheet is composed of a negative electrode current collector and a negative electrode tab, the negative electrode current collector is made of a lithium foil material component, and the thickness of the negative electrode current collector is between 45-55 um.

[0007] Preferably, the contact surface between the positive electrode sheet and the positive electrode steel shell is a single-sided positive electrode material, and the contact surface between the negative electrode sheet and the negative electrode steel shell is a single-sided negative electrode material.

[0008] Preferably, all the positive pole tabs inside the battery cell are welded together and welded on the surface of the positive electrode steel shell, all the negative pole tabs inside the battery cell are welded together and welded on the surface of the negative electrode steel shell, the battery cell is loaded between the positive electrode steel shell and the negative electrode steel shell, and the positive electrode steel shell and the negative electrode steel shell are sealed and connected.

[0009] Preferably, the positive electrode current collector is an aluminum foil current collector, and the negative electrode current collector is a copper foil current collector.

[0010] Preferably, the number of stacked layers of the positive electrode sheets and the negative electrode sheets is between 2 and 200.

[0011] The present invention also provides a method for manufacturing a button-type lithium battery containing a solid electrolyte, comprising the following steps:

[0012] S1, preparing a solid electrolyte; dissolving polyethylene oxide and polyvinyl pyrrolidone in a ratio of 8:1 in N-methyl pyrrolidone, adding lithium bis(trifluoromethanesulfonyl imide) as a lithium salt, wherein the ratio of ethylene oxide to lithium in the lithium bis(trifluoromethanesulfonyl imide) is 8:1, and then adding a conductive nano-ceramic powder, wherein the oxide composition of the conductive nano-ceramic powder is Li6.4La3Zr1.4Ta0.6O12, and the mass of polyethylene oxide in the conductive nano-ceramic powder is between 10-20%, performing homogenization and dispersion to form a solid electrolyte;

[0013] S2, preparing positive electrode slurry; dissolving positive electrode active material, carbon black Super-P, carbon black KS-6, and polyvinylidene fluoride in a ratio of 96:1:1.5:1.5, wherein the positive electrode active material includes lithium cobalt oxide, lithium iron phosphate, and ternary NCM, in N-methylpyrrolidone, performing homogenization and dispersion, and after uniform mixing, polyethylene oxide accounts for 5% of the active material, and then adding the solid electrolyte prepared in S1, and stirring evenly to form a positive electrode slurry;

[0014] S3, preparing negative electrode slurry; dissolving negative electrode active material, carbon black Super-P as an electric agent, sodium carboxymethyl cellulose as a binder and styrene-butadiene rubber latex in a ratio of 96:1.5:1:1.5, wherein the negative electrode active material includes graphite and lithium titanate, in water, performing homogenization and dispersion, and after uniform mixing, polyethylene oxide accounts for 5% of the active material, and then adding the solid electrolyte prepared in S1, and stirring evenly to form a negative electrode slurry;

[0015] S4, making positive electrode sheets and negative electrode sheets;

[0016] S5, welding the positive electrode tab on the positive electrode sheet, and welding the negative electrode tab on the negative electrode sheet;

[0017] S6, stacking the positive electrode sheet and the negative electrode sheet to form a battery cell;

[0018] S7, all the positive electrode tabs are welded together and welded on the surface of the positive electrode steel shell, all the negative electrode tabs are welded together and welded on the surface of the negative electrode steel shell, the battery cell is installed between the positive electrode steel shell and the negative electrode steel shell, and the positive electrode steel shell and the negative electrode steel shell are sealed and connected.

[0019] Preferably, the steps for making the positive electrode sheet in step S4 are as follows:

[0020] S41, coating the positive electrode slurry on the upper and lower surfaces of the positive electrode current collector to form a first positive electrode material layer and a second positive electrode material layer, and then coating, forming and drying;

[0021] S42, coating a solid electrolyte on the surface of the first positive electrode material layer and the second positive electrode material layer to form a first solid electrolyte layer and a second solid electrolyte layer, and coating, forming and drying;

[0022] S43, punching it into corresponding shapes using a punching machine to make a positive electrode sheet.

[0023] Preferably, the steps for making the negative electrode sheet in step S4 are as follows:

[0024] S44, coating the negative electrode slurry on the upper and lower surfaces of the negative electrode current collector to form a first negative electrode material layer and a second negative electrode material layer, and then coating, forming and drying;

[0025] S45, coating a solid electrolyte on the surface of the first negative electrode material layer and the second negative electrode material layer to form a third solid electrolyte layer and a fourth solid electrolyte layer, and coating, forming and drying;

[0026] S46, punching it into a corresponding shape using a punching machine to make a negative electrode sheet.

[0027] Preferably, the number of stacked layers of the positive electrode sheets and the negative electrode sheets in step S6 is between 2 and 200.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. In the present invention, solid electrolytes are added to the first positive electrode material layer, the second positive electrode material layer, the first negative electrode material layer, and the second negative electrode material layer, which can reduce the solid-solid interface and thus improve the charge and discharge rate of the solid-state battery.

[0030] 2. The positive electrode sheet of the present invention is coated with a first solid electrolyte layer and a second solid electrolyte layer, and the negative electrode sheet is coated with a third solid electrolyte layer and a fourth solid electrolyte layer, thereby eliminating the positive and negative electrode bag making process, reducing the volume of the button lithium battery, and improving the energy density of the button lithium battery. At the same time, it can improve the production efficiency and improve the safety performance of the battery.

[0031] 3. The battery cell of the present invention is formed by stacking positive and negative electrode sheets alternately. The button-type lithium battery is manufactured by stacking or laminating technology, which is simpler and more practical than the winding technology and has higher production efficiency and yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the exploded structure of a button-type lithium battery containing a solid electrolyte provided by the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of a positive electrode sheet of a button-type lithium battery containing a solid electrolyte provided by the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of a negative electrode sheet of a button-type lithium battery containing a solid electrolyte provided by the present invention;

[0036] Figure 4 It is a schematic structural diagram of a button-type lithium battery containing a solid electrolyte provided by the present invention, in which a negative electrode current collector and a negative electrode tab are assembled together.

[0037] Included in the figure are:

[0038] 1-battery cell, 2-positive electrode steel shell, 3-negative electrode steel shell, 4-positive electrode sheet, 5-negative electrode sheet, 41-positive electrode collector, 42-first positive electrode material layer, 43-second positive electrode material layer, 44-first solid electrolyte layer, 45-second solid electrolyte layer, 46-positive electrode tab, 51-negative electrode collector, 52-first negative electrode material layer, 53-second negative electrode material layer, 54-third solid electrolyte layer, 55-fourth solid electrolyte layer, 56-negative electrode tab. DETAILED DESCRIPTION

[0039] The technical scheme in this embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in this embodiment of the present invention. Obviously, the described embodiment is one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0040] Please refer to Figures 1 to 4 Embodiment 1 of the present invention provides a button-type lithium battery containing a solid electrolyte, including a battery cell 1, wherein one side of the battery cell 1 is provided with a positive electrode steel shell 2, and the other side is provided with a negative electrode steel shell 3, wherein the battery cell 1 is formed by stacking positive electrode sheets 4 and negative electrode sheets 5 alternately, and the button-type lithium battery is manufactured by stacking or laminating process, which is simpler and more practical than the winding process, and has higher production efficiency and yield rate.

[0041] like Figure 2 As shown, the positive electrode sheet 4 includes a positive electrode collector 41, one side of the positive electrode collector 41 is coated with a first positive electrode material layer 42, and the other side of the positive electrode collector 41 is coated with a second positive electrode material layer 43, the first positive electrode material layer 42 is coated with a first solid electrolyte layer 44, and the second positive electrode material layer 43 is coated with a second solid electrolyte layer 45, and the positive electrode collector 41 is provided with a positive electrode tab 46, as shown in FIG. Figure 3 As shown, the negative electrode sheet 5 includes a negative electrode collector 51, one side surface of the negative electrode collector 51 is coated with a first negative electrode material layer 52, and the other side surface is coated with a second negative electrode material layer 53, the first negative electrode material layer 52 is coated with a third solid electrolyte layer 54, the second negative electrode material layer 53 is coated with a fourth solid electrolyte layer 55, the negative electrode collector 51 is provided with a negative electrode tab 56, the positive electrode sheet 4 is coated with a first solid electrolyte layer 44 and a second solid electrolyte layer 45, and the negative electrode sheet 5 is coated with a third solid electrolyte layer 54 and a fourth solid electrolyte layer 55, thereby eliminating the positive and negative electrode bag making process, reducing the volume of the button lithium battery, and improving the energy density of the button lithium battery, while improving the production efficiency and the safety performance of the battery.

[0042] At the same time, the first positive electrode material layer 42 and the second positive electrode material layer 43 are both added with solid electrolytes, and the first negative electrode material layer 52 and the second negative electrode material layer 53 are both added with solid electrolytes, so that the button-type lithium battery has better ion conductivity and smaller solid-solid interface, so that the button-type lithium battery has a higher charge and discharge rate. The button-type lithium battery manufactured by the lamination process has a higher energy density, and the yield and safety of the button-type lithium battery are improved.

[0043] like Figure 1As shown, the contact surface between the positive electrode sheet 4 and the positive electrode steel shell 2 is a single-sided positive electrode material, and the contact surface between the negative electrode sheet 5 and the negative electrode steel shell 3 is a single-sided negative electrode material.

[0044] All the positive pole tabs 46 inside the battery cell 1 are welded together and welded on the surface of the positive pole steel shell 2, all the negative pole tabs 56 inside the battery cell 1 are welded together and welded on the surface of the negative pole steel shell 3, the battery cell 1 is loaded between the positive pole steel shell 2 and the negative pole steel shell 3, and the positive pole steel shell 2 and the negative pole steel shell 3 are sealed and connected.

[0045] The positive electrode current collector 11 is an aluminum foil current collector, and the negative electrode current collector 12 is a copper foil current collector.

[0046] The number of stacked layers of the positive electrode sheet 4 and the negative electrode sheet 5 is between 2 and 200. The number of stacked layers can be selected according to actual conditions and is not limited to this embodiment. Example

[0047] The second embodiment of the present invention provides a button-type lithium battery containing a solid electrolyte. The button-type lithium battery described in the second embodiment has a structure similar to that of the button-type lithium battery described in the first embodiment. The similarities are not repeated here. The difference is that: Figure 4 As shown, the negative electrode sheet 5 is composed of a negative electrode current collector 51 and a negative electrode tab 56. The negative electrode current collector 51 is made of a lithium foil material component, and the thickness of the negative electrode current collector 51 is between 45-55 um. Example

[0048] Embodiment 3 of the present invention provides a method for manufacturing a button-type lithium battery containing a solid electrolyte, comprising the following steps:

[0049] Step S1, preparing a solid electrolyte; dissolving polyethylene oxide (PEO) and polyvinyl pyrrolidone (PVP) in a ratio of 8:1 in N-methylpyrrolidone (NMP), adding lithium bis(trifluoromethanesulfonyl)imide (LITFSI) as a lithium salt, wherein the ratio of ethylene oxide (EO) to lithium (Li) in the lithium bis(trifluoromethanesulfonyl)imide is 8:1, and then adding a conductive nano-ceramic powder (LLZTO), wherein the oxide composition of the conductive nano-ceramic powder is Li6.4La3Zr1.4Ta0.6O12, and the mass of polyethylene oxide (PEO) in the conductive nano-ceramic powder is between 10-20%, performing homogenization and dispersion, and forming a solid electrolyte;

[0050] S2, preparing positive electrode slurry; dissolving positive electrode active material, carbon black Super-P, carbon black KS-6, and polyvinylidene fluoride in N-methylpyrrolidone (NMP) at a ratio of 96:1:1.5:1.5, wherein the positive electrode active material includes lithium cobalt oxide, lithium iron phosphate, and ternary NCM, and performing homogenization and dispersion. After uniform mixing, polyethylene oxide (PEO) accounts for 5% of the active material, and then adding the solid electrolyte prepared in S1, and stirring evenly to form a positive electrode slurry;

[0051] S3, preparing negative electrode slurry; dissolving negative electrode active material, carbon black Super-P as an electric agent, sodium carboxymethyl cellulose as a binder and styrene-butadiene rubber latex in water at a ratio of 96:1.5:1:1.5, wherein the negative electrode active material includes graphite and lithium titanate, and performing homogenization and dispersion. After uniform mixing, polyethylene oxide (PEO) accounts for 5% of the active material, and then adding the solid electrolyte prepared in S1, and stirring evenly to form negative electrode slurry;

[0052] S4, manufacturing a positive electrode sheet 4 and a negative electrode sheet 5; the manufacturing steps of the positive electrode sheet 4 are as follows:

[0053] S41, coating the positive electrode slurry on the upper and lower surfaces of the positive electrode current collector 41 to form a first positive electrode material layer 42 and a second positive electrode material layer 43, and then coating, forming and drying;

[0054] S42, coating a solid electrolyte on the surface of the first positive electrode material layer 42 and the second positive electrode material layer 43 to form a first solid electrolyte layer 44 and a second solid electrolyte layer 45, and then coating, forming and drying;

[0055] S43, punching it into a corresponding shape using a punching machine to make a positive electrode sheet 4;

[0056] The steps for making the negative electrode sheet 5 are as follows:

[0057] S44, coating the negative electrode slurry on the upper and lower surfaces of the negative electrode current collector 51 to form a first negative electrode material layer 52 and a second negative electrode material layer 53, and then coating, forming and drying;

[0058] S45, coating a solid electrolyte on the surface of the first negative electrode material layer 52 and the second negative electrode material layer 53 to form a third solid electrolyte layer 54 and a fourth solid electrolyte layer 55, and then coating, forming and drying;

[0059] S46, punching it into a corresponding shape using a punching machine to make a negative electrode sheet 5;

[0060] S5, welding the positive electrode tab 46 on the positive electrode sheet 4, and welding the negative electrode tab 56 on the negative electrode sheet 5;

[0061] S6, stacking the positive electrode sheet 4 and the negative electrode sheet 5 to form a battery cell 1; the number of stacking layers of the positive electrode sheet 4 and the negative electrode sheet 5 is between 2 and 200 layers, and the number of stacking layers can be selected according to actual conditions and is not limited to this embodiment;

[0062] S7, all the positive electrode tabs 46 are welded together and welded on the surface of the positive electrode steel shell 2, all the negative electrode tabs 56 are welded together and welded on the surface of the negative electrode steel shell 3, the battery cell 1 is loaded between the positive electrode steel shell 2 and the negative electrode steel shell 3, and the positive electrode steel shell 2 and the negative electrode steel shell 3 are sealed and connected. Example

[0063] Embodiment 4 of the present invention provides a method for manufacturing a button-type lithium battery containing a solid electrolyte. The manufacturing method of the button-type lithium battery described in the fourth embodiment is similar to the manufacturing method of the button-type lithium battery described in the third embodiment, and the similarities are not repeated here. The difference is that: Figure 4 As shown, the steps for making the negative electrode sheet 5 are as follows: the negative electrode sheet 5 is composed of a negative electrode collector 51 and a negative electrode tab 56, the negative electrode collector 51 is made of a lithium foil material component, the thickness of the negative electrode collector 51 is between 45-55um, and it is punched into a corresponding shape by a punching machine to make the negative electrode sheet 5.

[0064] In summary, the beneficial effects of the present invention are:

[0065] In the present invention, solid electrolytes are added to the first positive electrode material layer 42, the second positive electrode material layer 43, the first negative electrode material layer 52 and the second negative electrode material layer 53, which can reduce the solid-solid interface, thereby improving the charge and discharge rate of the solid-state battery; the positive electrode sheet 4 of the present invention is coated with the first solid electrolyte layer 44 and the second solid electrolyte layer 45, and the negative electrode sheet 5 is coated with the third solid electrolyte layer 54 and the fourth solid electrolyte layer 55, thereby eliminating the positive and negative electrode bag making process, reducing the volume of the button lithium battery, and improving the energy density of the button lithium battery. At the same time, it can improve the production efficiency and the safety performance of the battery; the battery cell 1 of the present invention is formed by the positive electrode sheet 4 and the negative electrode sheet 5 being stacked alternately with each other, and the button lithium battery is made by stacking or laminating technology, which is simpler and more practical than the winding process, and has higher production efficiency and yield rate.

Claims

1. A button-type lithium battery containing a solid electrolyte, characterized in that: The invention comprises a battery cell (1), wherein one side of the battery cell (1) is provided with a positive electrode steel shell (2), and the other side is provided with a negative electrode steel shell (3), wherein the battery cell (1) is formed by stacking positive electrode sheets (4) and negative electrode sheets (5) alternately, wherein the positive electrode sheets (4) comprise a positive electrode current collector (41), wherein one side of the surface of the positive electrode current collector (41) is coated with a first positive electrode material layer (42), and the other side of the surface is coated with a second positive electrode material layer (43), wherein the first positive electrode material layer (42) is coated with a first solid electrolyte layer (44), and the second positive electrode material layer (43) is coated with a second positive electrode material layer (45). The invention relates to a method for manufacturing a semiconductor device ...

2. A button-type lithium battery containing a solid electrolyte according to claim 1, characterized in that: The negative electrode sheet (5) is composed of a negative electrode current collector (51) and a negative electrode tab (56); the negative electrode current collector (51) is made of a lithium foil material component; and the thickness of the negative electrode current collector (51) is between 45 and 55 μm.

3. A button-type lithium battery containing a solid electrolyte according to claim 1, characterized in that: The contact surface between the positive electrode sheet (4) and the positive electrode steel shell (2) is a single-sided positive electrode material, and the contact surface between the negative electrode sheet (5) and the negative electrode steel shell (3) is a single-sided negative electrode material.

4. A button-type lithium battery containing a solid electrolyte according to claim 1, characterized in that: All positive electrode tabs (46) inside the battery cell (1) are welded together and welded to the surface of the positive electrode steel shell (2); all negative electrode tabs (56) inside the battery cell (1) are welded together and welded to the surface of the negative electrode steel shell (3); the battery cell (1) is inserted between the positive electrode steel shell (2) and the negative electrode steel shell (3); and the positive electrode steel shell (2) and the negative electrode steel shell (3) are sealed and connected.

5. A button-type lithium battery containing a solid electrolyte according to claim 1, characterized in that: The positive electrode current collector (11) is an aluminum foil current collector, and the negative electrode current collector (12) is a copper foil current collector.

6. A button-type lithium battery containing a solid electrolyte according to claim 1, characterized in that: The number of stacked layers of the positive electrode sheet (4) and the negative electrode sheet (5) is between 2 and 200.

7. A method for manufacturing a button-type lithium battery containing a solid electrolyte according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, preparing a solid electrolyte; dissolving polyethylene oxide and polyvinyl pyrrolidone in a ratio of 8:1 in N-methyl pyrrolidone, adding lithium bis(trifluoromethanesulfonyl imide) as a lithium salt, wherein the ratio of ethylene oxide to lithium in the lithium bis(trifluoromethanesulfonyl imide) is 8:1, and then adding a conductive nano-ceramic powder, wherein the oxide composition of the conductive nano-ceramic powder is Li6.4La3Zr1.4Ta0.6O12, and the mass of polyethylene oxide in the conductive nano-ceramic powder is between 10-20%, performing homogenization and dispersion to form a solid electrolyte; S2, preparing positive electrode slurry; dissolving positive electrode active material, carbon black Super-P, carbon black KS-6, and polyvinylidene fluoride in a ratio of 96:1:1.5:1.5, wherein the positive electrode active material includes lithium cobalt oxide, lithium iron phosphate, and ternary NCM, in N-methylpyrrolidone, performing homogenization and dispersion, and after uniform mixing, polyethylene oxide accounts for 5% of the active material, and then adding the solid electrolyte prepared in S1, and stirring evenly to form a positive electrode slurry; S3, preparing the negative electrode slurry; the negative electrode active material, as an electric agent carbon black Super-P, as a binder sodium carboxymethyl cellulose and styrene-butadiene rubber emulsion by 96: The negative electrode active material includes graphite and lithium titanate, which are dissolved in water and dispersed in a homogenous slurry. After uniform mixing, polyethylene oxide accounts for 5% of the active material. The solid electrolyte prepared in S1 is added and stirred evenly to form a negative electrode slurry. S4, manufacturing a positive electrode sheet (4) and a negative electrode sheet (5); S5, welding the positive electrode tab (46) on the positive electrode sheet (4), and welding the negative electrode tab (56) on the negative electrode sheet (5); S6, stacking the positive electrode sheet (4) and the negative electrode sheet (5) to form a battery cell (1); S7, all positive electrode tabs (46) are welded together and welded on the surface of the positive electrode steel shell (2), all negative electrode tabs (56) are welded together and welded on the surface of the negative electrode steel shell (3), the battery cell (1) is installed between the positive electrode steel shell (2) and the negative electrode steel shell (3), and the positive electrode steel shell (2) and the negative electrode steel shell (3) are sealed and connected.

8. The method for manufacturing a button-type lithium battery containing a solid electrolyte according to claim 7, characterized in that: The steps for making the positive electrode sheet (4) in step S4 are as follows: S41, coating the positive electrode slurry on the upper and lower surfaces of the positive electrode current collector (41) to form a first positive electrode material layer (42) and a second positive electrode material layer (43), and then coating, shaping and drying; S42, coating a solid electrolyte on the surface of the first positive electrode material layer (42) and the second positive electrode material layer (43) to form a first solid electrolyte layer (44) and a second solid electrolyte layer (45), and then coating, shaping and drying; S43, punching it into a corresponding shape using a punching machine to make a positive electrode sheet (4).

9. The method for manufacturing a button-type lithium battery containing a solid electrolyte according to claim 7, characterized in that: The steps for making the negative electrode sheet (5) in step S4 are as follows: S44, coating the negative electrode slurry on the upper and lower surfaces of the negative electrode current collector (51) to form a first negative electrode material layer (52) and a second negative electrode material layer (53), and then coating, shaping and drying; S45, coating a solid electrolyte on the surface of the first negative electrode material layer (52) and the second negative electrode material layer (53) to form a third solid electrolyte layer (54) and a fourth solid electrolyte layer (55), and then coating, shaping and drying; S46, punching it into a corresponding shape using a punching machine to make a negative electrode sheet (5).

10. The method for manufacturing a button-type lithium battery containing a solid electrolyte according to claim 7, characterized in that: In step S6, the number of stacked layers of the positive electrode sheet (4) and the negative electrode sheet (5) is between 2 and 200.

Images