Solid-state battery with series-parallel connection structure and preparation method of solid-state battery

Abstract

The invention relates to the technical field of solid-state batteries, in particular to a solid-state battery with a series-parallel connection structure and a preparation method thereof.The solid-state battery comprises a plurality of independent solid-state battery cells, and tabs of every two adjacent independent solid-state battery cells are connected in a welded mode so that a series connection mode or a parallel connection mode can be formed between the independent solid-state battery cells; and the shell main body is used for accommodating the plurality of independent solid-state battery cells. The solid-state battery has the effect of improving the voltage and capacity of the solid-state battery.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state batteries, and in particular to a solid-state battery with a series-parallel structure and a preparation method thereof. Background Art

[0002] Solid-state batteries are a cutting-edge battery technology. With the emergence of solid-state batteries, the electrolyte will no longer be shared inside the battery cell. It uses solid electrolytes to replace the liquid electrolytes in traditional lithium-ion batteries. Compared with liquid electrolytes, solid electrolytes are non-flammable, non-volatile, highly safe and have a long service life.

[0003] In the prior art, solid-state electrolytes have higher ionic conductivity and electrochemical window, so that solid-state batteries can operate at higher voltages without electrolyte decomposition or runaway electrochemical reactions. However, when preparing solid-state batteries, the material voltage platform of the solid electrolyte during solidification is generally between 0.1-7.0V, so the voltage and capacitance improvements of a single battery are limited and need to be improved. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a solid-state battery with a series-parallel structure and a preparation method thereof.

[0005] The above invention objectives of the present application are achieved through the following technical solutions: In a first aspect, the present invention provides a solid-state battery with a series-parallel structure, comprising a plurality of independent solid-state cells, wherein the tabs of two adjacent independent solid-state cells are connected by welding, so that a series mode or a parallel mode is formed between the independent solid-state cells; A shell body for accommodating a plurality of independent solid-state battery cells.

[0006] By adopting the above technical solution, each independent solid-state battery cell has its own solid electrolyte and electrode structure. Through the welding connection of the pole ears, it is possible to flexibly establish electrical connections between several independent solid-state battery cells, that is, to combine several independent solid-state battery cells in series or parallel to form an overall solid-state battery pack, so as to break through the voltage or capacity limitations of a single battery cell. In the series mode, the battery voltage can be increased, and in the parallel mode, the battery capacity can be increased, so that the voltage and capacity of the overall solid-state battery pack can be flexibly adjusted, without being limited by the material voltage platform range of the solid electrolyte in a single independent solid-state battery cell, so as to meet the needs of different application scenarios. At the same time, by setting the outer shell body, several independent solid-state battery cells can be packaged and integrated as a whole.

[0007] In a preferred example, the present application may be further configured as follows: the independent solid-state battery cell includes a plastic shell and a battery cell body, the plastic shell is a closed structure, and the battery cell body is arranged inside the plastic shell.

[0008] By adopting the above technical solution, during the process of independent heating, pressurization and formation of independent solid-state battery cells, the plastic shell serving as the outer shell of the independent solid-state battery cells can be quickly formed and sealed, thereby improving the efficiency of solid-state battery preparation. In addition, the cost of the plastic shell is relatively low, which can effectively reduce the preparation cost of the overall solid-state battery pack.

[0009] In a preferred example, the present application can be further configured as follows: the shell body is an aluminum-plastic film, the two ends of the shell body are open and are respectively provided with a first cover and a second cover, the first cover and the second cover are both provided with pits, the pits are located inside the shell body, a first sealing layer is provided between the outer wall of the pit and the inner wall of the shell body, the pit located in the first cover is provided with a protrusion, the protrusion has a number of makeshift openings corresponding to the number of battery cell ears, a second sealing layer is provided between the inner wall of the protrusion and the battery cell ears, and the shell body is installed on the outside of several of the independent solid-state battery cells in a wrapped manner.

[0010] By adopting the above technical scheme, the outer shell body with openings at both ends is matched with the first cover and the second cover, and cooperates with the first cover and the second cover to form a box-type packaging structure for accommodating a number of independent solid-state battery cells. The structure can form a complete battery package without relying on the depth of the punching holes of the aluminum-plastic film to accommodate the battery cells. The size of the overall solid-state battery pack can be flexibly adjusted according to the number of battery cells. The outer shell body is formed by wrapping the aluminum-plastic film, which can ensure the consistency and stability of the aluminum-plastic film structure at the main body of the overall solid-state battery pack, and make the packaging and integration of the independent solid-state battery cells easier, reduce the assembly difficulty of the battery cell splicing process, reduce the manufacturing cost, and is suitable for the preparation conditions of soft-pack batteries.

[0011] In a preferred example, the present application can be further configured as follows: the recess and the protrusion are both formed by stamping.

[0012] By adopting the above technical solution and a highly automated and repeatable stamping method, the structural consistency and stability of each pit and protrusion can be ensured, thereby improving the production quality of the battery.

[0013] In a preferred example, the present application can be further configured as follows: the outer shell body is a metal shell, and a positive electrode access port and a negative electrode access port are respectively provided on the outer side of the outer shell body.

[0014] By adopting the above technical solution and using a metal shell as the main body of the outer shell, the overall solid-state battery pack can be provided with good protection and can resist external physical impact and damage. In addition, through the setting of the positive electrode access port and the negative electrode access port, the connection between the overall solid-state battery pack and the external circuit is more convenient and reliable, and is suitable for the working conditions of square shell batteries and cylindrical batteries.

[0015] In a second aspect, the present invention provides a method for preparing a solid-state battery with a series-parallel structure, comprising the following steps: According to the size requirements of the battery body, prepare a plastic shell of corresponding size; After placing the battery cell body into the plastic shell, the plastic shell is hot-melt packaged to form a plastic battery structure; The plastic battery structure is dried and dehydrated by a battery cell drying device, and then the electrolyte is poured into the plastic battery structure; The plastic battery structure is subjected to a curing process of heating, pressurizing, and charging and discharging to complete the curing of the electrolyte and form an independent solid-state battery cell; According to the requirements, the above steps are repeated to prepare a plurality of independent solid-state battery cells, and the tabs of two adjacent independent solid-state battery cells are connected by welding, so that the independent solid-state battery cells are assembled into a series mode or a parallel mode to form a solid-state battery pack; According to the size of the solid-state battery pack, a shell body is prepared, and the solid-state battery pack is encapsulated inside the shell body to form an assembled battery series-parallel structure.

[0016] By adopting the above technical scheme, during the preparation process, the size of the plastic shell is determined according to the size of the battery body to ensure that the plastic shell can completely wrap the battery body and leave enough margin for subsequent hot-melt packaging and curing molding, and the plastic battery structure is dried by the battery drying device to remove the moisture inside it to reduce the subsequent impact on the electrolyte, and then the plastic battery structure is heated, pressurized and charged and discharged to form an independent solid-state battery cell, and then the pole ears of several independent solid-state battery cells are electrically connected by welding to form a series mode or a parallel mode to form a solid-state battery pack, and the shell body is packaged to complete the manufacture of the assembled battery series-parallel structure, wherein the plastic shell can be quickly formed and sealed under heating and pressurizing conditions to improve the efficiency of solid-state battery preparation, and the cost of the plastic shell is low, which can effectively reduce the preparation cost of the solid-state battery pack.

[0017] In a preferred example, the present application can be further configured as follows: the battery cell body is prepared by laminating with a laminating machine or by a winding process.

[0018] By adopting the above technical solution, it can adapt to the working conditions of various battery cells.

[0019] In a preferred example, the present application can be further configured as follows: the plastic shell is prepared by stamping.

[0020] By adopting the above technical solution and a highly automated and repeatable stamping method, it is possible to ensure that each plastic shell can accurately match the size of the battery cell and that the plastic shell can tightly wrap the battery cell. At the same time, the stamping method is adapted to the plasticity and mechanical strength of the plastic shell and the working conditions of the plastic shell.

[0021] In a preferred example, the present application can be further configured as follows: after the plastic battery structure completes the curing process, the redundant edge sealing of the plastic battery structure is cut off.

[0022] By adopting the above technical solution, the appearance and performance of the independent solid-state battery cell can be improved, so that the solid-state battery pack can be formed and encapsulated inside the shell body.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Each independent solid-state battery cell has its own solid electrolyte and electrode structure. Through the welding connection of the pole ears, it is possible to flexibly establish electrical connections between several independent solid-state battery cells, that is, to combine several independent solid-state battery cells in series or parallel to form an overall solid-state battery pack, so as to break through the voltage or capacity limitations of a single battery cell. In the series mode, the battery voltage can be increased, and in the parallel mode, the battery capacity can be increased, so that the voltage and capacity of the overall solid-state battery pack can be flexibly adjusted, without being limited by the material voltage platform range of the solid electrolyte in a single independent solid-state battery cell, so as to meet the needs of different application scenarios. At the same time, by setting the outer shell body, several independent solid-state battery cells can be packaged and integrated as a whole.

[0024] 2. During the independent heating, pressurizing and formation process of the independent solid-state battery cells, the plastic shell, as the outer shell of the independent solid-state battery cells, can be quickly formed and sealed, thereby improving the efficiency of solid-state battery preparation. In addition, the cost of the plastic shell is relatively low, which can effectively reduce the preparation cost of the overall solid-state battery pack.

[0025] 3. When assembling a battery series-parallel structure as a soft-pack battery, the outer shell body with openings at both ends is matched with a first cover and a second cover, and cooperates with the first cover and the second cover to form a first sealing layer between the pits and the outer shell body to form a box-type packaging structure for accommodating a number of independent solid-state battery cells. This structure can form a complete battery package without relying on the depth of the pits of the aluminum-plastic film to accommodate the battery cells. The size of the overall solid-state battery pack can be flexibly adjusted according to the number of battery cells, and the outer shell body is formed by wrapping the aluminum-plastic film. The consistency and stability of the aluminum-plastic film structure at the main body of the overall solid-state battery pack can be ensured, and the packaging and integration process of the independent solid-state battery cells can be simplified, the assembly difficulty of the battery cell splicing process can be reduced, and the manufacturing cost can be reduced. It is suitable for the preparation conditions of soft-pack batteries.

[0026] 4. When assembling the battery series-parallel structure as a square shell battery or a cylindrical battery, a metal shell is used as the outer shell body, which can provide good protection for the overall solid-state battery pack and resist external physical impact and damage. In addition, through the setting of the positive electrode access port and the negative electrode access port, the connection between the overall solid-state battery pack and the external circuit is more convenient and reliable, which is suitable for the working conditions of square shell batteries and cylindrical batteries.

[0027] 5. During the preparation process, the size of the plastic shell is determined according to the size of the battery cell body to ensure that the plastic shell can completely wrap the battery cell body and leave enough margin for subsequent hot-melt packaging and curing molding, and the plastic battery structure is dried by a battery cell drying device to remove the moisture inside it to reduce the subsequent impact on the electrolyte. The plastic battery structure is then heated, pressurized, and charged and discharged to form an independent solid-state battery cell. Subsequently, the pole ears of several independent solid-state battery cells are electrically connected by welding to form a series mode or a parallel mode to form a solid-state battery pack, and the shell body is packaged to complete the manufacture of the assembled battery series-parallel structure, wherein the plastic shell can be quickly formed and sealed under heating and pressurization conditions to improve the efficiency of solid-state battery preparation, and the cost of the plastic shell is low, which can effectively reduce the preparation cost of the solid-state battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an assembly schematic diagram of a battery series-parallel structure when the housing body is an aluminum-plastic film in one embodiment of the present application; Figure 2 is a schematic structural diagram of a first cover and a second cover in an embodiment of the present application; Figure 3 It is a schematic diagram of the overall structure of the assembled battery series-parallel structure when the shell body is an aluminum-plastic film in one embodiment of the present application; Figure 4It is an assembly diagram of a battery series-parallel structure when the housing body is a metal shell in one embodiment of the present application; Figure 5 It is an assembly diagram of a battery series-parallel structure when the housing body is a metal shell in another embodiment of the present application; Figure 6 This is a preparation flow chart of assembling a battery series-parallel structure as a soft-pack battery in one embodiment of the present application; Figure 7 This is a preparation flow chart of assembling a battery series-parallel structure as a square shell battery in one embodiment of the present application; Figure 8 This is a preparation flow chart for assembling a battery series-parallel structure as a cylindrical battery in one embodiment of the present application.

[0029] Figure numerals: 1. Independent solid-state battery cell; 2. Shell body; 3. Ear; 4. Plastic shell; 5. First cover; 6. Second cover; 7. Pit; 8. First sealing layer; 9. Protrusion; 10. Make way; 11. Second sealing layer. DETAILED DESCRIPTION

[0030] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0031] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure.

[0032] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0033] A solid-state battery with a series-parallel structure of the present application is described below with reference to the accompanying drawings.

[0034] Reference Figures 1 to 8 , among which, Figure 1 , Figure 4 and Figure 5 As shown, a solid-state battery with a series-parallel structure includes a plurality of independent solid-state battery cells 1 and a shell body 2, wherein the pole ears 3 of two adjacent independent solid-state battery cells 1 are connected by welding so that a series mode or a parallel mode is formed between the plurality of independent solid-state battery cells 1, and the shell body 2 is used to accommodate the plurality of independent solid-state battery cells 1, wherein each independent solid-state battery cell 1 has its own solid electrolyte and electrode structure, and through the welding connection of the pole ears 3, an electrical connection can be flexibly established between the plurality of independent solid-state battery cells 1, that is, a plurality of independent solid-state battery cells 1 are combined in series or in parallel to form an overall solid-state battery pack, so as to break through the voltage or capacity limitation of a single battery cell, and the battery voltage can be increased in the series mode, and the battery capacity can be increased in the parallel mode, so that the voltage and capacity of the overall solid-state battery pack can be flexibly adjusted, and are not limited by the material voltage platform range of the solid electrolyte in a single independent solid-state battery cell 1, so as to meet the needs of different application scenarios, and at the same time, by setting the shell body 2, a plurality of independent solid-state battery cells 1 can be packaged and integrated as a whole.

[0035] Specifically, the independent solid-state battery cell 1 includes a plastic shell 4 and a battery cell body (not shown in the figure). The plastic shell 4 is a closed structure, and the battery cell body is arranged inside the plastic shell 4, so that during the independent heating, pressurization and formation of the independent solid-state battery cell 1, the plastic shell 4 serves as the outer shell of the independent solid-state battery cell 1, and can be quickly formed and sealed, thereby improving the efficiency of solid-state battery preparation, and the cost of the plastic shell 4 is relatively low, which can effectively reduce the preparation cost of the overall solid-state battery pack.

[0036] In one embodiment, if Figure 1 , Figure 2 and Figure 3As shown, the shell body 2 is an aluminum-plastic film, the two ends of the shell body 2 are open and respectively provided with a first cover 5 and a second cover 6, the first cover 5 and the second cover 6 are both provided with a pit 7, the pit 7 is located inside the shell body 2, and a first sealing layer 8 is provided between the outer wall of the pit 7 and the inner wall of the shell body 2, the pit 7 located in the first cover 5 is provided with a protrusion 9, and the protrusion 9 is provided with a plurality of make way openings 10 corresponding to the number of battery cell pole ears 3, and a second sealing layer 11 is provided between the inner wall of the protrusion 9 and the battery cell pole ears 3. The shell body 2 is installed on the outside of a plurality of independent solid-state battery cells 1 in a wrapped manner, wherein the shell body 2 with openings at both ends is matched with the first cover 5 and the second cover 6, and cooperates with the first sealing layer 8 to seal the outer wall of the shell body 2. A first sealing layer 8 is arranged between a recess 7 provided on both the first cover 5 and the second cover 6 and the outer shell body 2 to form a box-type packaging structure for accommodating a plurality of independent solid-state battery cells 1. This structure can form a complete battery package without relying on the depth of the recess of the aluminum-plastic film to accommodate the battery cells. The size of the overall solid-state battery pack can be flexibly adjusted according to the number of battery cells. The outer shell body 2 is formed by wrapping the aluminum-plastic film, which can ensure the consistency and stability of the aluminum-plastic film structure at the main body of the overall solid-state battery pack, and make the packaging and integration of the independent solid-state battery cells 1 easier, reduce the assembly difficulty of the battery cell splicing process, reduce the manufacturing cost, and is suitable for the preparation conditions of soft-pack batteries.

[0037] It should be noted that, in the present embodiment, the first sealing layer 8 and the second sealing layer 11 are both formed by hot-melt sealing, which has strong adaptability, good sealing effect and high sealing efficiency, and is suitable for the working conditions of soft-pack batteries.

[0038] Furthermore, the recesses 7 and protrusions 9 are formed by stamping. By adopting a stamping method with high automation and repeatability, the structural consistency and stability of each recess 7 and protrusion 9 can be ensured, thereby improving the production quality of the battery.

[0039] In another embodiment, if Figure 4 and Figure 5 As shown, the outer shell body 2 is a metal shell, such as an aluminum alloy shell, a steel shell, a titanium alloy shell, etc., and a positive electrode access port (not shown in the figure) and a negative electrode access port (not shown in the figure) are respectively arranged on the outer side of the outer shell body 2. By adopting a metal shell as the outer shell body 2, the overall solid-state battery pack can be provided with good protection, and can resist external physical impact and damage. In addition, through the setting of the positive electrode access port and the negative electrode access port, the connection between the overall solid-state battery pack and the external circuit is more convenient and reliable, which is suitable for the working conditions of square shell batteries and cylindrical batteries.

[0040] like Figure 6 , Figure 7 and Figure 8 As shown, the present invention provides a method for preparing a solid-state battery with a series-parallel structure, comprising the following steps: According to the size requirements of the battery body, prepare a plastic shell 4 of corresponding size; After the battery cell body is placed in the plastic shell 4, the plastic shell 4 is hot-melt packaged to form a plastic battery structure; The plastic battery structure is dried and dehydrated by a battery cell drying device, and then the electrolyte is poured into the plastic battery structure; The plastic battery structure is subjected to a curing process of heating, pressurizing, and charging and discharging to complete the curing of the electrolyte and form an independent solid-state battery cell 1; According to the requirements, the above steps are repeated to prepare a plurality of independent solid-state battery cells 1, and the tabs 3 of two adjacent independent solid-state battery cells 1 are connected by welding, so that the independent solid-state battery cells 1 are assembled into a series mode or a parallel mode to form a solid-state battery pack; According to the size of the solid-state battery pack, a shell body 2 is prepared, and the solid-state battery pack is encapsulated inside the shell body 2 to form an assembled battery series-parallel structure.

[0041] In the preparation process of the present application, the size of the plastic shell 4 is determined according to the size of the battery body to ensure that the plastic shell 4 can completely wrap the battery body and leave enough margin for subsequent hot-melt packaging and curing molding, and the plastic battery structure is dried by a battery drying device to remove the moisture inside it to reduce the subsequent impact on the electrolyte, and then the plastic battery structure is heated, pressurized and charged and discharged to form an independent solid-state battery cell 1, and then the pole ears 3 of several independent solid-state battery cells 1 are electrically connected by welding to form a series mode or a parallel mode to form a solid-state battery pack, and the outer shell body 2 is packaged to complete the manufacture of the assembled battery series-parallel structure, wherein the plastic shell can be quickly formed and sealed under heating and pressurization conditions to improve the efficiency of solid-state battery preparation, and the cost of the plastic shell 4 is low, which can effectively reduce the preparation cost of the solid-state battery pack.

[0042] It should be noted that the battery cell drying device is a device specifically used to remove water and dry batteries. The common battery cell drying devices on the market can be used. Its specific structure and working principle are common knowledge to those skilled in the art and will not be elaborated or limited here.

[0043] Among them, the battery cell body can be prepared by stacking with a stacking machine or by a winding process, so as to reflect the strong versatility of the assembled battery structure and be able to adapt to the working conditions of various battery cells.

[0044] Furthermore, the plastic shell 4 is prepared by stamping. By adopting a stamping method with high automation and repeatability, it can ensure that each plastic shell 4 can accurately match the size of the battery cell and that the plastic shell 4 can tightly wrap the battery cell. At the same time, the stamping method is adapted to the plasticity and mechanical strength of the plastic shell 4 and adapts to the working conditions of the plastic shell 4.

[0045] Preferably, after the plastic battery structure completes the curing process, the excess sealing edge of the plastic battery structure is cut off to improve the appearance and performance of the independent solid-state battery cell 1, so as to form a solid-state battery pack and encapsulate it into the shell body 2.

[0046] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A solid-state battery with a series-parallel structure, characterized in that: include: A plurality of independent solid-state battery cells (1), wherein the tabs (3) of two adjacent independent solid-state battery cells (1) are connected by welding, so that a series connection mode or a parallel connection mode is formed between the independent solid-state battery cells (1); A casing body (2) is used to accommodate a plurality of independent solid-state battery cells (1).

2. A solid-state battery with a series-parallel structure as claimed in claim 1, characterized in that: The independent solid-state battery cell (1) comprises a plastic shell (4) and a battery cell body; the plastic shell (4) is a closed structure; and the battery cell body is arranged inside the plastic shell (4).

3. A solid-state battery with a series-parallel structure as claimed in claim 1, characterized in that: The shell body (2) is an aluminum-plastic film. The two ends of the shell body (2) are open and are respectively provided with a first cover (5) and a second cover (6). The first cover (5) and the second cover (6) are both provided with a pit (7). The pit (7) is located inside the shell body (2). A first sealing layer (8) is provided between the outer wall of the pit (7) and the inner wall of the shell body (2). The pit (7) located on the first cover (5) is provided with a protrusion (9). The protrusion (9) is provided with a number of clearance openings (10) corresponding to the number of battery cell tabs (3). A second sealing layer (11) is provided between the inner wall of the protrusion (9) and the battery cell tabs (3). The shell body (2) is installed on the outer side of the plurality of independent solid-state battery cells (1) in a wrapped manner.

4. A solid-state battery with a series-parallel structure as claimed in claim 3, characterized in that: The concave pit (7) and the protrusion (9) are both formed by stamping.

5. A solid-state battery with a series-parallel structure as claimed in claim 1, characterized in that: The outer shell body (2) is a metal shell, and a positive electrode access port and a negative electrode access port are respectively arranged on the outer side of the outer shell body (2).

6. A method for preparing a solid-state battery with a series-parallel structure as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: According to the size requirements of the battery cell body, prepare a plastic shell (4) of corresponding size; After placing the battery cell body into the plastic shell (4), the plastic shell (4) is hot-melt packaged to form a plastic battery structure; The plastic battery structure is dried and dehydrated by a battery cell drying device, and then the electrolyte is poured into the plastic battery structure; The plastic battery structure is subjected to a curing process of heating, pressurizing, and charging and discharging to complete the curing of the electrolyte and form an independent solid-state battery cell (1); According to the requirements, the above steps are repeated to prepare a plurality of independent solid-state battery cells (1), and the tabs (3) of two adjacent independent solid-state battery cells (1) are connected by welding, so that the plurality of independent solid-state battery cells (1) are assembled into a series mode or a parallel mode to form a solid-state battery pack; According to the size of the solid-state battery pack, a shell body (2) is prepared, and the solid-state battery pack is encapsulated inside the shell body (2) to form an assembled battery series-parallel structure.

7. A method for preparing a solid-state battery with a series-parallel structure as claimed in claim 6, characterized in that: The battery cell body is prepared by laminating with a laminating machine or by a winding process.

8. The method for preparing a solid-state battery with a series-parallel structure according to claim 6, characterized in that: The plastic shell (4) is prepared by stamping.

9. The method for preparing a solid-state battery with a series-parallel structure according to claim 6, characterized in that: After the plastic battery structure completes the curing process, the redundant sealing edge of the plastic battery structure is cut off.

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