Solid state battery and continuous manufacturing method thereof

Abstract

The invention provides a solid-state battery and a continuous manufacturing method thereof. The continuous manufacturing method of the solid-state battery comprises the following steps: preparing a positive plate monomer; transferring the solid electrolyte to a corresponding position of the negative electrode belt or the positive electrode sheet monomer; an edge modification layer is prepared on the surface of the negative belt corresponding to the position of the positive plate monomer, a positive electrode placement area is arranged in the edge modification layer, and the size of the positive electrode placement area is consistent with that of the positive plate monomer; after the positive plate monomers are placed in the positive electrode placing area, densification is carried out, so that a densified composite material belt is formed; and carrying out die cutting on the composite material belt to obtain the solid-state battery cell unit. Compared with the prior art, the continuous manufacturing method of the solid-state battery does not need an additional packaging procedure before densification and an unsealing procedure after densification, and the manufacturing efficiency of the solid-state battery can be greatly improved; and the conditions of layer staggering and collapse of the positive plate monomers can be effectively avoided, and the yield of the obtained solid-state battery cell unit is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a solid-state battery and a continuous manufacturing method thereof. Background Art

[0002] Solid-state lithium-ion batteries use solid electrolytes as ion transport media, which can match higher capacity and higher voltage positive and negative electrode material systems, thereby effectively improving the safety performance and energy density of the battery cell, and therefore have attracted much attention from the industry. However, how to achieve efficient and continuous production of solid-state batteries is still a problem that the industry urgently needs to solve.

[0003] In the current solid-state battery preparation process, the densification process is one of the main challenges for the efficient production of solid-state batteries. The existing densification process mainly adopts isostatic pressing, and the cells are individually pressed after packaging, which has low production efficiency. In addition, due to the edge shear force problem, it is easy to cause edge collapse and pole piece dislocation, resulting in short circuit of the cell and low production yield, further reducing production efficiency. Summary of the invention

[0004] In view of this, the embodiments of the present application are dedicated to providing a solid-state battery and a continuous manufacturing method thereof to solve the problems of low production efficiency and low yield of solid-state battery cell units in the prior art.

[0005] On the one hand, the present application provides a method for continuous manufacturing of a solid-state battery, comprising:

[0006] preparing a cathode sheet monomer;

[0007] Transferring the solid electrolyte to the corresponding position of the negative electrode belt or the positive electrode sheet monomer;

[0008] An edge modification layer is prepared on the surface of the negative electrode belt corresponding to the position of the positive electrode sheet monomer, wherein a positive electrode placement area is provided in the edge modification layer, and the size of the positive electrode placement area is consistent with the size of the positive electrode sheet monomer;

[0009] After placing the positive electrode sheet monomer in the positive electrode placement area, densification is performed to form a densified composite material strip;

[0010] The composite material strip is die-cut to obtain a solid-state battery cell unit.

[0011] In one embodiment of the present application, the edge finishing layer is configured to consist of a heat-fusible polymer or a composite material of a heat-fusible polymer and an inorganic filler.

[0012] In one embodiment of the present application, the steps of transferring the solid electrolyte to the corresponding position of the negative electrode belt or the positive electrode sheet monomer are:

[0013] Transferring the solid electrolyte to the corresponding position of the negative electrode belt;

[0014] Wherein, the height of the edge modification layer is configured to be the same as the height of the positive electrode sheet monomer, or 0-20 μm higher than the height of the positive electrode sheet monomer.

[0015] In one embodiment of the present application, the step of transferring the solid electrolyte to the corresponding position of the positive electrode sheet monomer is:

[0016] Transferring the solid electrolyte to the corresponding position of the positive electrode sheet monomer;

[0017] The height of the edge modification layer is configured to be the same as the overall height of the positive electrode sheet monomer and the solid electrolyte, or 0-20 μm higher than the overall height of the positive electrode sheet monomer and the solid electrolyte.

[0018] In one embodiment of the present application, the method for preparing the edge modification layer includes at least one of spraying, screen printing, and placing in a glue frame.

[0019] In one embodiment of the present application, it also includes: stacking the solid-state battery cells in series or in parallel.

[0020] A second aspect of the present application provides a continuous manufacturing device for solid-state batteries, comprising:

[0021] a negative electrode tape conveyor assembly configured to convey a negative electrode tape;

[0022] An edge modification layer preparation component, wherein the edge modification layer preparation component is configured to prepare an edge modification layer on the negative electrode belt, wherein a positive electrode placement area is provided in the edge modification layer, and the size of the positive electrode placement area is consistent with the size of the positive electrode sheet monomer;

[0023] A positive electrode sheet placement assembly, the positive electrode sheet placement assembly being configured to place a positive electrode sheet monomer in the positive electrode placement area to form a composite material strip to be densified, wherein a solid electrolyte is disposed between the positive electrode sheet and the negative electrode strip of the composite material strip to be densified;

[0024] The densification component is configured to densify the composite material strip to be densified after the composite material strip to be densified is driven by the negative electrode belt conveyor component to move to the densification component, so as to obtain a densified composite material strip.

[0025] In one embodiment of the present application, a die-cutting unit is further included, and the die-cutting unit is configured to die-cut the composite material strip to obtain a solid-state battery cell unit.

[0026] In one embodiment of the present application, it also includes a lamination unit, which is configured to stack the solid-state battery cells in series or in parallel.

[0027] A third aspect of the present application provides a solid-state battery prepared using the continuous manufacturing method of the solid-state battery.

[0028] The continuous manufacturing method of the solid-state battery of the present application first arranges an edge modification layer, a positive electrode sheet monomer and a solid electrolyte on the negative electrode strip to form a composite material strip, and then performs densification and die-cutting to obtain a solid-state battery cell unit. Compared with the prior art, no additional pre-densification packaging and post-densification unpacking steps are required, which can greatly improve the manufacturing efficiency of the solid-state battery.

[0029] By preparing an edge modification layer on the surface of the negative electrode belt corresponding to the position of the positive electrode sheet monomer, and providing a positive electrode placement area in the edge modification layer, the placement position of the positive electrode sheet monomer can be effectively restricted, thereby effectively avoiding the misplacement of the positive electrode sheet monomer, the solid electrolyte, and the negative electrode sheet monomer in the solid-state battery cell unit after subsequent densification due to the misplacement of the positive electrode sheet monomer, thereby improving the yield of the obtained solid-state battery cell unit.

[0030] Furthermore, since the edge modification layer has a certain height, it can bear pressure together with the edge of the positive electrode sheet, and try to avoid the edge of the positive electrode sheet bearing pressure alone, thereby reducing the edge collapse of the positive electrode sheet and improving the yield of the obtained solid-state battery cell unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shown is a schematic diagram of the steps of the continuous manufacturing method of the solid-state battery of the present application;

[0032] Figure 2 Shown is a schematic diagram of the structure of the solid-state battery obtained in this application;

[0033] Figure 3 Shown is another structural schematic diagram of the solid-state battery obtained in this application.

[0034] Figure ID:

[0035] 1. Positive electrode monomer; 2. Negative electrode monomer; 3. Edge modification layer; 4. Solid electrolyte. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] like Figures 1 to 3 As shown, the present disclosure provides a continuous manufacturing method of a solid-state battery, comprising:

[0038] Step S101: preparing a positive electrode sheet monomer 1.

[0039] The positive electrode sheet monomer 1 mainly includes a positive electrode current collector and a positive electrode film layer, and can be obtained by cutting a positive electrode sheet strip, or by other methods, which are not limited here.

[0040] Step S102: transfer the solid electrolyte 4 to the corresponding position of the negative electrode belt or the positive electrode sheet monomer 1.

[0041] The negative electrode belt mainly includes a negative electrode current collector in a belt shape and a negative electrode film layer. The solid electrolyte 4 can be a common solid-state battery electrolyte such as a sulfide electrolyte, a polymer electrolyte, an oxide electrolyte and a composite thereof with ion conductivity, which is not limited here.

[0042] like Figure 2 and Figure 3 As shown, the continuous manufacturing method of the solid-state battery of the present application can be divided into two slightly different methods, one of which is to transfer the solid electrolyte 4 to the corresponding position of the negative electrode band, and the other method is to transfer the solid electrolyte 4 to the corresponding position of the positive electrode sheet monomer 1. The height limit of the edge modification layer 3 in the two methods is slightly different, and the other parts are basically the same.

[0043] Step S103: preparing an edge modification layer 3 on the surface of the negative electrode strip corresponding to the position of the positive electrode sheet monomer 1.

[0044] A positive electrode placement area is provided in the edge modification layer 3 , and the size of the positive electrode placement area is consistent with the size of the positive electrode sheet monomer 1 , so as to limit the placement range of the positive electrode sheet monomer 1 and prevent a gap from appearing between the electrode sheet monomer and the edge modification layer 3 .

[0045] Specifically, the method for preparing the edge modification layer 3 includes at least one of spraying, screen printing, and placing in a glue frame. Although the spraying and screen printing methods are more expensive, the position of the obtained edge modification layer 3 is more accurate, which is convenient for the accuracy of the position after the subsequent placement of the positive electrode sheet monomer 1. The method of placing a glue frame requires the edge modification layer 3 to be prepared in advance, and then the edge modification layer 3 is placed in the corresponding position. Although it is more cumbersome, the processing cost is lower.

[0046] The edge modification layer 3 is composed of a heat-fusible polymer or a composite material of a heat-fusible polymer and an inorganic filler, so as to be closely combined with the positive electrode sheet monomer 1 during the subsequent rolling process. Specifically, the heat-fusible polymer can be polyolefin, polyester, polyurethane, polyamide, styrene and its block copolymer, and other polymers, and the type of inorganic filler is not specifically limited.

[0047] After the edge modification layer 3 is prepared by spraying, screen printing, or placing a glue frame, the negative electrode tape may be dried to ensure that there is no liquid on the surface of the negative electrode tape.

[0048] Step S104: After placing the positive electrode sheet monomer 1 in the positive electrode placement area, densification is performed to form a densified composite material strip.

[0049] Specifically, the corresponding areas of the positive electrode sheet monomer 1 and the edge modification layer 3 can be densified by roller pressing / flat plate hot pressing, so as to form a densified composite material strip, which forms a densified battery cell unit. In addition, roller pressing / flat plate hot pressing and other methods are highly controllable and convenient for real-time monitoring.

[0050] Step S105: die-cut the composite material strip to obtain a solid-state battery cell unit.

[0051] After densification, the negative electrode tape is cut according to the position of the edge modification layer 3 to obtain a solid electrolytic unit having a positive electrode sheet monomer 1, a solid electrolyte 4, and a negative electrode sheet monomer 2. It is understandable that the edge modification layer 3 can be retained in the solid battery cell to protect the positive electrode sheet and / or the solid electrolyte 4.

[0052] It can be seen that the continuous manufacturing method of the solid-state battery of the present application first arranges the edge modification layer 3, the positive electrode sheet monomer 1 and the solid electrolyte 4 on the negative electrode strip to form a composite material strip, and then performs densification and die-cutting to obtain a solid-state battery cell unit. Compared with the prior art, no additional pre-densification packaging and post-densification unpacking steps are required, which can greatly improve the manufacturing efficiency of the solid-state battery.

[0053] By preparing an edge modification layer 3 on the surface of the negative electrode belt corresponding to the position of the positive electrode sheet monomer 1, a positive electrode placement area is provided in the edge modification layer 3, which can effectively limit the placement position of the positive electrode sheet monomer 1, thereby effectively avoiding the misplacement of the positive electrode sheet, the solid electrolyte 4, and the negative electrode sheet monomer 2 in the solid-state battery cell unit after subsequent densification due to the misplacement of the positive electrode sheet monomer 1, thereby improving the yield of the obtained solid-state battery cell unit.

[0054] Furthermore, since the edge modification layer 3 has a certain height, it can bear pressure together with the edge of the positive electrode sheet monomer 1, and try to avoid the edge of the positive electrode sheet monomer 1 bearing pressure alone, thereby reducing the edge collapse of the positive electrode sheet monomer 1 and improving the yield of the obtained solid-state battery cell unit.

[0055] It can be understood that in one embodiment of the present application, in the step of transferring the solid electrolyte 4 to the corresponding position of the negative electrode band or the positive electrode sheet monomer 1, the solid electrolyte 4 is transferred to the corresponding position of the negative electrode band, that is, when the solid electrolyte 4 is transferred to the corresponding position of the negative electrode band, the height of the edge modification layer 3 is constructed to be the same as the height of the positive electrode sheet monomer 1, or 0-20μm higher than the height of the positive electrode sheet monomer 1, so as to ensure that during the densification process, the height of the edge modification layer 3 is the same as the height of the positive electrode sheet monomer 1, or slightly higher than the positive electrode sheet monomer 1, and the edge modification layer 3 can bear pressure together with the edge of the positive electrode sheet monomer 1 to avoid the edge of the positive electrode sheet monomer 1 from bearing pressure alone, thereby avoiding the edge collapse of the positive electrode sheet monomer 1, and further improving the yield of the obtained solid-state battery cell unit.

[0056] In one embodiment of the present application, in the step of transferring the solid electrolyte 4 to the corresponding position of the positive electrode sheet monomer 1, the solid electrolyte 4 is transferred to the corresponding position of the positive electrode sheet monomer 1, that is, when the solid electrolyte 4 is transferred to the corresponding position of the positive electrode sheet monomer 1, the height of the edge modification layer 3 is constructed to be the same as the overall height of the positive electrode sheet monomer 1 and the solid electrolyte 4, or 0-20μm higher than the overall height of the positive electrode sheet monomer 1 and the solid electrolyte 4, to ensure that during the densification process, the height of the edge modification layer 3 is the same as the height of the positive electrode sheet monomer 1 and the solid electrolyte 4, or slightly higher than the positive electrode sheet monomer 1 and the solid electrolyte 4, the edge modification layer 3 can bear pressure together with the edge of the positive electrode sheet monomer 1, to avoid the edge of the positive electrode sheet monomer 1 from bearing pressure alone, thereby avoiding the edge collapse of the positive electrode sheet monomer 1, and further improving the yield of the obtained solid-state battery cell unit.

[0057] Further, such as Figure 1 As shown, in one embodiment of the present application, the continuous manufacturing method of the solid-state battery of the present application further includes:

[0058] Step S106: stacking the solid-state battery cells in series or in parallel.

[0059] It can be understood that stacking solid-state battery cells in series means that adjacent solid-state battery cells are in direct contact with each other through the positive and negative electrodes. Stacking solid-state battery cells in parallel means that two adjacent solid-state battery cells are in contact with each other through the positive electrode, and the other two sides are arranged in a manner that the negative electrodes of the two cells are respectively. Among them, in order to facilitate the subsequent electrical connection of the solid-state battery cell units, the solid-state battery cell units after series connection may not retain the positive and negative pole ears, and the solid-state battery cell units after parallel connection need to retain the positive and negative pole ears.

[0060] Therefore, the continuous manufacturing method of the solid-state battery of the present application does not require additional pre-densification packaging and post-densification unpacking processes, and can directly perform lamination after die-cutting, thereby greatly improving the manufacturing efficiency of the solid-state battery.

[0061] The present application also provides a continuous manufacturing device for solid-state batteries, comprising:

[0062] A negative electrode tape conveyor assembly, the negative electrode tape conveyor assembly is configured to convey a negative electrode tape;

[0063] An edge modification layer 3 preparation component is configured to prepare an edge modification layer 3 on the negative electrode belt, wherein a positive electrode placement area is provided in the edge modification layer 3, and the size of the positive electrode placement area is consistent with the size of the positive electrode sheet monomer 1;

[0064] A positive electrode sheet placement assembly, the positive electrode sheet placement assembly is configured to place a positive electrode sheet monomer 1 in a positive electrode placement area to form a composite material strip to be densified, wherein a solid electrolyte 4 is arranged between the positive electrode sheet and the negative electrode strip of the composite material strip to be densified;

[0065] The densification component is configured to densify the composite material strip to be densified after the composite material strip to be densified is driven by the negative electrode belt conveyor component to move to the densification component, so as to obtain a densified composite material strip.

[0066] Furthermore, in one embodiment of the present application, the continuous manufacturing equipment of the solid-state battery of the present application also includes a die-cutting unit, and the die-cutting unit is configured to die-cut the composite material strip to obtain a solid-state battery cell unit.

[0067] Furthermore, in one embodiment of the present application, the continuous manufacturing equipment of the solid-state battery of the present application also includes a stacking unit, and the stacking unit is configured to stack the solid-state battery cell units in series or in parallel.

[0068] It can be understood that before the continuous manufacturing equipment of the solid-state battery of the present application is used, the solid electrolyte 4 has been transferred to the corresponding position of the negative electrode belt or the positive electrode sheet monomer 1.

[0069] During the operation of the continuous manufacturing equipment of the solid-state battery of the present application, the negative electrode belt conveyor assembly can be used to convey the negative electrode belt; during the movement of the negative electrode belt, the edge modification layer 3 preparation assembly can continuously prepare the edge modification layer 3 on the negative electrode belt, and the positive electrode sheet placement assembly can continuously place the positive electrode sheet monomer 1 in the positive electrode placement area, and then, when the positive electrode sheet moves to the densification assembly with the negative electrode belt, the densification assembly can densify the material belt at the corresponding position of the positive electrode sheet and the edge modification layer 3 to obtain a densified composite material belt. Then, the die-cutting unit can die-cut the densified composite material belt to obtain a solid-state battery cell unit, and further, the lamination unit can also laminate the solid-state battery cell unit in series or parallel.

[0070] Compared with the prior art, the continuous manufacturing equipment for solid-state batteries of the present application can continuously manufacture solid-state battery cells and die-cut and stack the solid-state battery cells without the need for additional pre-densification packaging and post-densification unpacking processes, which can greatly improve the manufacturing efficiency of solid-state batteries.

[0071] In addition, by setting the edge modification layer 3 to the position of the positive electrode sheet monomer 1 corresponding to the surface of the negative electrode belt, and providing a positive electrode placement area in the edge modification layer 3, the placement position of the positive electrode sheet monomer 1 can be effectively limited, thereby effectively avoiding the misplacement of the positive electrode sheet monomer 1, resulting in the subsequent densification, and the occurrence of misalignment of the positive electrode sheet, the solid electrolyte 4, and the negative electrode sheet monomer 2 in the solid-state battery cell unit, thereby improving the yield of the obtained solid-state battery cell unit. Since the edge modification layer 3 has a certain height, it can bear pressure together with the edge of the positive electrode sheet monomer 1, and try to avoid the edge of the positive electrode sheet monomer 1 bearing pressure alone, thereby reducing the edge collapse of the positive electrode sheet monomer 1, and can also improve the yield of the obtained solid-state battery cell unit. The present application also provides a solid-state battery, which is prepared by the above-mentioned continuous manufacturing method of the solid-state battery. Compared with the existing solid-state battery, the solid-state battery of the present application not only has high processing efficiency, but also has a relatively high yield.

[0072] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for continuous manufacturing of solid-state batteries, characterized in that: include: Preparing a positive electrode sheet monomer (1); Transferring the solid electrolyte (4) to the corresponding position of the negative electrode strip or the positive electrode sheet monomer (1); An edge modification layer (3) is prepared on the surface of the negative electrode strip at a position corresponding to the positive electrode sheet monomer (1), wherein a positive electrode placement area is provided in the edge modification layer (3), and the size of the positive electrode placement area is consistent with the size of the positive electrode sheet monomer (1); After placing the positive electrode sheet monomer (1) in the positive electrode placement area, densification is performed to form a densified composite material strip; The composite material strip is die-cut to obtain a solid-state battery cell unit.

2. The method for continuous manufacturing of solid-state batteries according to claim 1, characterized in that: The edge finishing layer (3) is constructed to be composed of a heat-fusible polymer or a composite material of a heat-fusible polymer and an inorganic filler.

3. The method for continuous manufacturing of solid-state batteries according to claim 1, characterized in that: The steps of transferring the solid electrolyte (4) to the corresponding position of the negative electrode belt or the positive electrode sheet monomer (1) are: Transferring the solid electrolyte (4) to the corresponding position of the negative electrode strip; The height of the edge modification layer (3) is configured to be the same as the height of the positive electrode sheet monomer (1), or 0-20 μm higher than the height of the positive electrode sheet monomer (1).

4. The method for continuous manufacturing of solid-state batteries according to claim 1, characterized in that: The steps of transferring the solid electrolyte (4) to the corresponding position of the positive electrode sheet monomer (1) are: Transferring the solid electrolyte (4) to the corresponding position of the positive electrode sheet monomer (1); The height of the edge modification layer (3) is constructed to be the same as the overall height of the positive electrode sheet monomer (1) and the solid electrolyte (4), or 0-20 μm higher than the overall height of the positive electrode sheet monomer (1) and the solid electrolyte (4).

5. The method for continuous manufacturing of solid-state batteries according to claim 1, characterized in that: The method for preparing the edge modification layer (3) comprises at least one of spraying, screen printing, and placing in a glue frame.

6. The method for continuous manufacturing of solid-state batteries according to claim 1, characterized in that: Also includes: The solid-state battery core units are stacked in series or in parallel.

7. A continuous manufacturing device for solid-state batteries, characterized in that: include: a negative electrode tape conveyor assembly configured to convey a negative electrode tape; An edge modification layer (3) preparation component, the edge modification layer (3) preparation component is configured to prepare an edge modification layer (3) on the negative electrode belt, a positive electrode placement area is provided in the edge modification layer (3), and the size of the positive electrode placement area is consistent with the size of the positive electrode sheet monomer (1); A positive electrode sheet placement assembly, the positive electrode sheet placement assembly being configured to place a positive electrode sheet monomer (1) in the positive electrode placement area to form a composite material strip to be densified, wherein a solid electrolyte (4) is arranged between the positive electrode sheet and the negative electrode strip of the composite material strip to be densified; The densification component is configured to densify the composite material strip to be densified after the composite material strip to be densified is driven by the negative electrode belt conveyor component to move to the densification component, so as to obtain a densified composite material strip.

8. The continuous manufacturing equipment for solid-state batteries according to claim 7, characterized in that: It also includes a die-cutting unit, which is configured to die-cut the composite material strip to obtain a solid-state battery cell unit.

9. The continuous manufacturing equipment for solid-state batteries according to claim 8, characterized in that: It also includes a lamination unit, which is configured to stack the solid-state battery cells in series or in parallel.

10. A solid-state battery, characterized in that: It is prepared by the continuous manufacturing method of the solid-state battery according to any one of claims 1 to 9.

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