Solid-state battery with series-parallel connection structure

Abstract

The utility model relates to the technical field of solid-state batteries, in particular to a solid-state battery with a series-parallel connection structure, which comprises a plurality of independent solid-state battery cells, tabs of two adjacent independent solid-state battery cells are connected in a welding manner, so that a series connection mode or a parallel connection mode is formed between the plurality of 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 utility model relates to the technical field of solid state battery especially to a solid state battery with series-parallel connection structure. BACKGROUND

[0002] Solid state battery is a kind of frontier battery technology, the appearance of solid state battery, battery cell will no longer share electrolyte, its use solid electrolyte replaces the liquid electrolyte in traditional lithium-ion battery, compared with liquid electrolyte, solid electrolyte is not flammable, not volatile, high safety, long service life.

[0003] In prior art, solid electrolyte has higher ionic conductivity and electrochemical window, so that solid state battery can work at higher voltage without decomposition of electrolyte or loss of control of electrochemical reaction, but when preparing solid state battery, the material voltage platform of solid electrolyte during solidification is usually between 0.1-7.0V, so the voltage and capacitance of single battery are limited, and improvement is needed. SUMMARY

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

[0005] The above utility model object of the present application is realized by the following technical scheme:

[0006] A solid state battery with series-parallel connection structure comprises a plurality of independent solid state battery cells, the tabs of two adjacent independent solid state battery cells are connected by welding to form a series or parallel mode between the plurality of independent solid state battery cells.

[0007] A housing body for accommodating the plurality of independent solid state battery cells.

[0008] By adopting the above technical scheme, each independent solid state battery cell has its own solid electrolyte and electrode structure, and the tabs are connected by welding to establish electrical connection between the plurality of independent solid state battery cells, i.e. the plurality of independent solid state battery cells are combined to form a whole solid state battery pack in series or parallel mode, to break through the voltage or capacity limit of single battery cell, to increase battery voltage in series mode and to increase battery capacity in parallel mode, so that the voltage and capacity of the whole solid state battery pack can be flexibly adjusted, and are not limited by the material voltage platform range of the solid electrolyte in single independent solid state battery cell, to meet the needs of different application scenarios, and the housing body is provided to enable the plurality of independent solid state battery cells to be packaged and integrated as a whole.

[0009] In a preferred example, the independent solid-state battery cell can be further configured to include a plastic shell and a cell body, the plastic shell being a closed structure, and the cell body being arranged inside the plastic shell.

[0010] By adopting the above technical solution, during the independent heating, pressurizing and formation of the independent solid-state battery cell, the plastic shell as the shell of the independent solid-state battery cell can be quickly formed and sealed, thereby improving the efficiency of the preparation of the solid-state battery, and the cost of the plastic shell is relatively low, which can effectively reduce the preparation cost of the overall solid-state battery pack.

[0011] In a preferred example, the shell body can be an aluminum plastic film, both 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 a recess, the recess is located inside the shell body, a first sealing layer is arranged between the outer side wall of the recess and the inner side wall of the shell body, the recess of the first cover is provided with a protrusion, a plurality of accommodation openings are arranged on the protrusion corresponding to the number of cell tabs, a second sealing layer is arranged between the inner side wall of the protrusion and the cell tabs, and the shell body is wrapped around the outside of the plurality of independent solid-state battery cells.

[0012] By adopting the above technical solution, the shell body with both ends open is matched with the first cover and the second cover, and the first sealing layer is arranged between the recess of the first cover and the second cover and the shell body, so as to form a box-shaped packaging structure for accommodating a plurality of independent solid-state battery cells. This structure can form a complete battery packaging, does not need to rely on the punching depth of the aluminum plastic film to accommodate the battery cell, can flexibly adjust the size of the overall solid-state battery pack according to the number of battery cells, and can ensure the consistency and stability of the aluminum plastic film structure of the main body of the overall solid-state battery pack by wrapping the shell body with the aluminum plastic film. This structure can make the packaging and integration of a plurality of independent solid-state battery cells more convenient, reduce the assembly difficulty of the cell splicing process, reduce the manufacturing cost, and is suitable for the preparation of soft package batteries.

[0013] In a preferred example, the recess and the protrusion can be formed by stamping.

[0014] By adopting the above technical solution, the stamping method with high automation and repeatability can ensure the consistency and stability of the structure of each recess and protrusion, thereby improving the production quality of the battery.

[0015] In a preferred example, the shell body can be a metal shell, and the shell body is respectively provided with a positive electrode access port and a negative electrode access port.

[0016] By adopting the above technical scheme, the metal shell is adopted as the shell main body, which can provide good protection for the overall solid-state battery pack, can resist external physical impact and damage, and through the setting of the positive electrode access port and the negative electrode access port, the connection of the overall solid-state battery pack and the external circuit is more convenient and reliable, which is suitable for the working conditions of the square shell battery and the cylindrical battery.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. Each independent solid-state electric core has its own solid electrolyte and electrode structure, which can flexibly establish electrical connection between several independent solid-state electric cores through the welding connection of the tabs, that is, several independent solid-state electric cores are combined to form an overall solid-state battery pack in series or parallel mode, so as to break through the voltage or capacity limit of a single electric core, improve the battery voltage in series mode, and improve the battery capacity in parallel mode, so that the voltage and capacity of the overall solid-state battery pack can be flexibly adjusted, which is not limited by the material voltage platform range of the solid electrolyte in a single independent solid-state electric core, so as to meet the needs of different application scenarios, and the shell main body is set to enable several independent solid-state electric cores to complete overall packaging and integration.

[0019] 2. In the process of independent heating, pressurizing and forming of the independent solid-state electric core, the plastic shell body as the shell of the independent solid-state electric core can be quickly formed and sealed, thereby improving the efficiency of solid-state battery preparation, and the cost of the plastic shell body is relatively low, which can effectively reduce the preparation cost of the overall solid-state battery pack.

[0020] 3. When assembling the battery series-parallel structure as a soft package battery, the two-end-open shell main body is matched with the first cover and the second cover, and the first sealing layer is arranged between the recesses provided on the first cover and the second cover and the shell main body, so as to form a box-type packaging structure for accommodating several independent solid-state electric cores. This structure can form a complete battery packaging, does not need to rely on the punching depth of the aluminum plastic film to accommodate the electric core, can flexibly adjust the size of the overall solid-state battery pack according to the number of electric cores, and forms the shell main body through the aluminum plastic film wrapping method, 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 makes the packaging and integration of several independent solid-state electric cores more convenient, reduces the assembly difficulty of the electric core splicing process, reduces the manufacturing cost, and is suitable for the preparation working condition of the soft package battery.

[0021] 4. When assembling the battery series-parallel structure as a square shell battery or a cylindrical battery, the metal shell is adopted as the shell main body, which can provide good protection for the overall solid-state battery pack, can resist external physical impact and damage, and through the setting of the positive electrode access port and the negative electrode access port, the connection of the overall solid-state battery pack and the external circuit is more convenient and reliable, which is suitable for the working conditions of the square shell battery and the cylindrical battery. Attached Figure Description

[0022] Figure 1 This is an assembly diagram of the battery series-parallel structure when the outer shell body is an aluminum-plastic film in one embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the first and second caps in one embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the overall structure of the battery series-parallel connection structure when the outer shell body is an aluminum-plastic film in one embodiment of this application;

[0025] Figure 4 This is an assembly diagram of the battery series-parallel structure when the outer shell is a metal shell in one embodiment of this application;

[0026] Figure 5 This is an assembly diagram of the battery series-parallel structure when the outer casing is a metal casing, according to another embodiment of this application.

[0027] Figure 6 This is a flowchart illustrating the fabrication process when assembling a series-parallel battery structure as a pouch battery in one embodiment of this application.

[0028] Figure 7 This is a flowchart illustrating the fabrication process when assembling a prismatic battery in one embodiment of this application;

[0029] Figure 8 This is a flowchart illustrating the fabrication process when assembling a cylindrical battery in a series-parallel configuration according to one embodiment of this application.

[0030] Reference numerals: 1. Independent solid-state battery cell; 2. Casing body; 3. Electrode; 4. Plastic casing; 5. First cover; 6. Second cover; 7. Recess; 8. First sealing layer; 9. Protrusion; 10. Relief opening; 11. Second sealing layer. Detailed Implementation

[0031] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0032] It should be noted that the terms "first", "second", and the like in the present utility model are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the 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.

[0033] In addition, the term "and / or" herein is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects unless otherwise specified.

[0034] A solid-state battery with a series-parallel structure is described below with reference to the accompanying drawings.

[0035] Referring to Figures 1 to 8 , as shown in Figure 1 , Figure 4 and Figure 5 , the solid-state battery with a series-parallel structure includes a plurality of independent solid-state battery cells 1 and a shell body 2. The tabs 3 of two adjacent independent solid-state battery cells 1 are connected by welding to form a series or parallel mode between the plurality of independent solid-state battery cells 1. The shell body 2 is used to accommodate the plurality of independent solid-state battery cells 1. Each independent solid-state battery cell 1 has its own solid electrolyte and electrode structure. Through the welding connection of the tabs 3, the electrical connection between the plurality of independent solid-state battery cells 1 can be flexibly established, i.e., the plurality of independent solid-state battery cells 1 are combined to form an overall solid-state battery pack in series or parallel, to break through the voltage or capacity limit of a single cell. In series mode, the battery voltage can be increased, and in 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, and are not limited by the material voltage platform range of the solid electrolyte in a single independent solid-state battery cell 1, to meet the needs of different application scenarios. At the same time, by providing the shell body 2, the plurality of independent solid-state battery cells 1 can be completely packaged and integrated.

[0036] 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. During the independent heating, pressurizing and formation of the independent solid-state battery cell 1, the plastic shell 4 serves as the shell of the independent solid-state battery cell 1, which can be quickly formed and sealed, thereby improving the efficiency of solid-state battery preparation. Moreover, the cost of the plastic shell 4 is relatively low, which can effectively reduce the preparation cost of the overall solid-state battery pack.

[0037] In an embodiment, asFigure 1 、 Figure 2 and Figure 3 As shown in the drawings, the shell body 2 is an aluminum plastic film, the shell body 2 is open at both ends and is 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 recess 7, the recess 7 is located inside the shell body 2, a first sealing layer 8 is arranged between the outer side wall of the recess 7 and the inner side wall of the shell body 2, the recess 7 located at the first cover 5 is provided with a protrusion 9, the protrusion 9 is provided with a plurality of accommodation openings 10 corresponding to the number of the cell tabs 3, a second sealing layer 11 is arranged between the inner side wall of the protrusion 9 and the cell tabs 3, and the shell body 2 is wrapped around the outer side of the plurality of independent solid-state cells 1, wherein the open-ended shell body 2 is matched with the first cover 5 and the second cover 6, and the first sealing layer 8 arranged between the recess 7 of the first cover 5 and the second cover 6 and the shell body 2 is matched with the first sealing layer 8 arranged between the recess 7 of the first cover 5 and the second cover 6 and the shell body 2 to form a box-type packaging structure for accommodating the plurality of independent solid-state cells 1. This structure can form a complete battery package without relying on the punching depth of the aluminum plastic film to accommodate the cells. The size of the overall solid-state battery pack can be flexibly adjusted according to the number of cells, and the shell body 2 is formed by wrapping the aluminum plastic film. The consistency and stability of the aluminum plastic film structure of the overall solid-state battery pack can be ensured, and the packaging and integration of the plurality of independent solid-state cells 1 are more convenient. The assembly difficulty of the cell splicing process is reduced, the manufacturing cost is reduced, and it is suitable for the preparation conditions of soft package batteries.

[0038] It should be noted that in this embodiment, the first sealing layer 8 and the second sealing layer 11 are both formed by hot melting. Hot melting sealing has strong adaptability, good sealing effect and high sealing efficiency, and is suitable for the working conditions of soft package batteries.

[0039] Further, the recess 7 and the protrusion 9 are both formed by stamping. By using 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.

[0040] In another embodiment, as shown in Figure 4 and Figure 5 The shell body 2 is a metal shell, such as an aluminum alloy shell, a steel shell, a titanium alloy shell, etc. The outer side of the shell body 2 is respectively provided with a positive electrode inlet (not shown in the figure) and a negative electrode inlet (not shown in the figure). By using a metal shell as the shell body 2, the overall solid-state battery pack can be provided with good protection, which can resist external physical impact and damage. The connection between the overall solid-state battery pack and the external circuit is more convenient and reliable through the arrangement of the positive electrode inlet and the negative electrode inlet, which is suitable for the working conditions of square cell batteries and cylindrical batteries.

[0041] As shown in Figure 6 , Figure 7 and Figure 8As shown, the preparation process of the solid-state battery with series-parallel structure in the application includes the following steps:

[0042] According to the size requirements of the battery core body, a plastic shell 4 with corresponding size is prepared;

[0043] After the battery core body is placed inside the plastic shell 4, the plastic shell 4 is heat-sealed and packaged to form a plastic battery structure;

[0044] The plastic battery structure is dried by a battery core drying device, and then electrolyte is injected into the plastic battery structure;

[0045] The plastic battery structure is subjected to a curing process of warming, pressurizing and charging and discharging to complete electrolyte curing and form an independent solid-state battery core 1;

[0046] According to requirements, the above steps are repeated to prepare several independent solid-state battery cores 1, and the tabs 3 of adjacent two independent solid-state battery cores 1 are connected by welding to form a series mode or a parallel mode among the several independent solid-state battery cores 1, thereby forming a solid-state battery pack;

[0047] According to the size of the solid-state battery pack, a shell body 2 is prepared, and the solid-state battery pack is packaged into the shell body 2 to form an assembled battery series-parallel structure.

[0048] In the preparation process of the application, the size of the plastic shell 4 is determined according to the size of the battery core body to ensure that the plastic shell 4 can completely wrap the battery core body and have sufficient excess to facilitate subsequent heat-sealing and curing molding, and the plastic battery structure is dried by a battery core drying device to remove moisture inside, thereby reducing the influence on the electrolyte in the subsequent process. Then, the plastic battery structure is subjected to a process of warming, pressurizing and charging and discharging to form an independent solid-state battery core 1, and then the tabs 3 of several independent solid-state battery cores 1 are electrically connected by welding to form a series mode or a parallel mode, thereby forming a solid-state battery pack, and the shell body 2 is packaged to complete the manufacturing of the assembled battery series-parallel structure. The plastic shell can be quickly molded and sealed under the working condition of warming and pressurizing to improve 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 solid-state battery pack.

[0049] It should be noted that the battery core drying device is a device specially used for drying and removing water from the battery. Common battery core drying devices on the market can be used, and the specific structure and working principle thereof are well known to those skilled in the art, which will not be described or limited here.

[0050] The battery core body can be prepared by lamination or winding process to reflect the strong universality of the assembled battery structure, which can adapt to various working conditions of the battery core.

[0051] Further, the plastic shell 4 is prepared by stamping, and by using the stamping method with high automation and repeatability, it can be ensured that each plastic shell 4 can accurately match the size of the battery cell, and ensure that the plastic shell 4 can tightly wrap the battery cell. The stamping method is suitable for the plasticity and mechanical strength of the plastic shell 4, and adapts to the working condition of the plastic shell 4.

[0052] Preferably, after the plastic battery structure completes the curing process, the excess edge of the plastic battery structure is cut off to improve the appearance and performance of the independent solid-state battery cell 1, and to facilitate the formation of the solid-state battery pack and the packaging into the shell body 2.

[0053] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A solid-state battery with a series-parallel structure, characterized in that, The utility model relates to a solid-state battery module, comprising: a plurality of independent solid-state battery cells (1), the tabs (3) of two adjacent independent solid-state battery cells (1) are connected by welding to form a series mode or a parallel mode among the plurality of independent solid-state battery cells (1); a shell body (2) for accommodating the plurality of independent solid-state battery cells (1).

2. A solid state battery with series-parallel connection 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 series-parallel connection as claimed in claim 1, characterized in that, The shell body (2) is an aluminum plastic film, both 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 recess (7), the recess (7) is located inside the shell body (2), a first sealing layer (8) is arranged between the outer side wall of the recess (7) and the inner side wall of the shell body (2), the recess (7) located at the first cover (5) is provided with a protrusion (9), a plurality of accommodation openings (10) corresponding to the number of battery cell tabs (3) are formed in the protrusion (9), a second sealing layer (11) is arranged between the inner side wall of the protrusion (9) and the battery cell tab (3), and the shell body (2) is wrapped around the plurality of independent solid-state battery cells (1) on the outside.

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

5. The solid state battery with series-parallel connection structure according to claim 1, characterized in that, The shell body (2) is a metal shell, and a positive electrode inlet and a negative electrode inlet are respectively arranged on the outer side of the shell body (2).

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