Internal parallel battery cell structure

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to an internal parallel battery cell structure which comprises a first lamination body, a second lamination body and a shell, wherein the first lamination body and the second lamination body are connected in parallel through the connecting tabs; the shell is provided with at least two assembling cavities, and the assembling cavities are used for assembling the first lamination body and the second lamination body; by adopting the improvement measures of the parallel battery cells, the parallel connection is completed before the battery cells are mounted into the shell, so that the subsequent sealing process of the battery cells is simplified, and the stability of the connection between the parallel battery cells is enhanced; in addition, through adaptive adjustment of the shell and the battery cells, the shaking phenomenon of the parallel battery cells in actual operation is further reduced, and the stability of the battery formed by the parallel battery cells in operation is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to an internal parallel cell structure. Background Technology

[0002] In the new energy battery industry, battery technology is undergoing rapid development due to the increasing popularity of electric vehicles, wearable devices, and portable electronic products. Among these technologies, the internal parallel cell structure has become a promising technical solution due to its ability to provide higher power density and good energy efficiency. However, several technical bottlenecks still exist in the design and manufacturing of current internal parallel cells, limiting their wider application and efficiency improvement.

[0003] Current internal parallel cell structure designs improve energy storage capacity by stacking two cells vertically. In practical applications of these internal parallel cells, the two cells are currently separated by an aluminum-plastic film, meaning they can only be fixed to the film using hot-melt adhesive paper. However, this method of fixing with hot-melt adhesive paper is highly susceptible to cell movement, which can negatively impact the quality of the finished cell and the stability of battery operation.

[0004] Therefore, it is urgent to improve the existing internal parallel cell structure to solve the defects of the aforementioned technology. Utility Model Content

[0005] The purpose of this utility model is to provide an internal parallel cell structure that can improve the stability of the cell structure, in order to address the shortcomings of the existing technology.

[0006] To achieve the above technical objective, this application implements the following technical solution:

[0007] An internal parallel cell structure includes a first stacked cell, a second stacked cell, and a housing; wherein the first stacked cell and the second stacked cell are connected in parallel via connecting tabs; the housing is provided with at least two assembly cavities for assembling the first stacked cell and the second stacked cell.

[0008] The above technical solution produces the following technical effects:

[0009] This application relates to an innovative internal parallel cell structure that abandons the traditional top-and-bottom stacking method, instead employing a first and second stack arranged in parallel. In this technical solution, the first and second stacks are connected in parallel within the cell before encapsulation via connecting tabs. This not only simplifies the subsequent sealing process but also enhances the stability of the internal parallel cell connection. Furthermore, this application's technical solution further integrates the two internally parallel cells into a single housing via an assembly cavity, effectively solving the problems of wobbling and insufficient stability found in existing internal parallel cell structures.

[0010] As a further improvement to the internal parallel cell structure of this utility model, both the first stack body and the second stack body include a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode.

[0011] As a further improvement to the internal parallel cell structure of this utility model, a first empty foil is provided extending from the first stacked body along the first direction; and a second empty foil is provided extending from the second stacked body along the first direction.

[0012] Both the first empty foil and the second empty foil are used to connect to the external electrode tab.

[0013] As a further improvement to the internal parallel cell structure of this utility model, the housing is provided with a top sealing area along the first direction of the housing, and the external electrode tab is inserted through the top sealing area.

[0014] As a further improvement to the internal parallel cell structure of this utility model, the first empty foil is formed by stacking and welding together positive empty foil segments extending from the positive electrode sheet, and the second empty foil is formed by stacking and welding together negative empty foil segments extending from the negative electrode sheet.

[0015] As a further improvement to the internal parallel cell structure of this utility model, the external electrode includes a positive external electrode and a negative external electrode. The positive external electrode is used to connect to the first empty foil, and the negative external electrode is used to connect to the second empty foil.

[0016] As a further improvement to the internal parallel cell structure of this utility model, along the second direction of the first stacked body, the first stacked body extends to provide a first positive electrode empty foil and a first negative electrode empty foil.

[0017] Along the second direction of the second stacked body, the second stacked body extends to provide a second positive electrode empty foil and a second negative electrode empty foil; the second positive electrode empty foil is connected to the first positive electrode empty foil through the connecting tab, and the second negative electrode empty foil is connected to the first negative electrode empty foil through the connecting tab.

[0018] As a further improvement to the internal parallel cell structure of this utility model, the connecting tab includes a connecting body and positioning bodies disposed at both ends of the connecting body in the length direction;

[0019] The positioning body is used to connect the first positive electrode empty foil to the second positive electrode empty foil or to connect the first negative electrode empty foil to the second negative electrode empty foil.

[0020] As a further improvement to the internal parallel cell structure of this utility model, the connector is provided with a sealing area, and the sealing area is provided with tab adhesive.

[0021] As a further improvement to the internal parallel cell structure of this utility model, a protective adhesive area is provided at the connection point between the connecting tab and the first positive electrode empty foil and / or at the connection point with the second positive electrode empty foil;

[0022] The protective adhesive area is provided with protective adhesive. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the shell structure in Embodiment 1 of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the first and second stacked sheets in Embodiment 1 of this utility model;

[0027] Figure 4 This is a side view of the first and second stacked sheets in Embodiment 2 of this utility model;

[0028] Figure 5 This is a schematic diagram of the connecting tab structure in Embodiment 3 of this utility model;

[0029] in:

[0030] 100-Internal parallel cell structure;

[0031] 11-First stacked body;

[0032] 111 - First empty foil sheet;

[0033] 112 - First positive electrode empty foil;

[0034] 113 - First negative electrode empty foil;

[0035] 12-Second stack;

[0036] 121 - Second empty foil;

[0037] 122 - Second positive electrode empty foil;

[0038] 123 - First negative electrode empty foil;

[0039] 13-Positive electrode sheet;

[0040] 131 – Positive electrode empty foil section;

[0041] 14- Negative electrode plate;

[0042] 141 - Negative electrode empty foil section;

[0043] 15-September;

[0044] 2-Connect the electrode tabs;

[0045] 21-Connector;

[0046] 211-Sealed Zone;

[0047] 22-Positioning body;

[0048] 23 - Protect the adhesive area;

[0049] 3-Shell;

[0050] 31-Assembly cavity;

[0051] 32-Top sealing area;

[0052] 33-Airbag;

[0053] 4-External electrode tab;

[0054] 41 - Positive external electrode tab;

[0055] 42 - Negative external electrode tab. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application.

[0057] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0059] The present invention will be further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0060] Implementation Method 1

[0061] like Figure 1-3 As shown, in order to solve the shaking problem caused by the weak adhesion of hot melt adhesive paper to the aluminum-plastic film in the existing internal parallel battery cell structure 100, this application improves the existing internal parallel battery cell structure 100.

[0062] Specifically, the stacked cells in this application are arranged in a separate parallel configuration, rather than being stacked first and then connected in parallel. The internally parallel cell includes a first stacked cell 11, a second stacked cell 12, and a housing 3. The first stacked cell 11 and the second stacked cell 12 are connected in parallel via connecting tabs 2. The housing 3 has at least two assembly cavities 31 for assembling the first stacked cell 11 and the second stacked cell 12. Furthermore, the housing 3 also has at least two air bags 33. The air bags 33 are designed to further absorb and buffer internal pressure changes that may occur during battery charging and discharging, thereby preventing cell damage due to excessive pressure.

[0063] In its implementation, the material selection and design of the airbag 33 take into account the temperature and pressure range of the battery's operating environment, ensuring that it can maintain its function even under extreme conditions. In this way, the battery's lifespan is significantly extended, while reducing safety risks caused by battery failure.

[0064] The above-mentioned technical solution addresses the technical defects of the existing parallel cell structure 100 by optimizing the cell assembly structure. This allows the cells to be connected in parallel before being installed into the housing 3, thus avoiding relative movement between cells that may occur in traditional stacking methods. This improvement not only simplifies the cell sealing process but also significantly enhances the stability of the cell connections. The adaptation and adjustment between the housing 3 and the cells further reduces the shaking phenomenon generated by the parallel cells during actual operation, thereby improving the stability of the battery composed of these parallel cells during operation.

[0065] Furthermore, the assembly cavity 31 provided in the housing 3 can ensure that the first stacked wafers 11 and the second stacked wafers 12 are stably assembled sequentially inside the housing 3, thereby ensuring the overall structural stability of the battery prepared with the parallel cells of this application. Embodiment 2

[0066] like Figure 1-4 As shown, unlike Embodiment 1, in order to further improve the stability of the internal battery cell structure 100 of this application, both the first stack 11 and the second stack 12 include a positive electrode 13, a negative electrode 14, and a separator 15 disposed between the positive electrode 13 and the negative electrode 14. This design ensures more uniform chemical reactions during the charging and discharging process of the battery, thereby improving the cycle life and stability of the battery.

[0067] Furthermore, in order to achieve parallel connection within the battery cells, along the first direction of the first stack 11 (specifically, the length or width direction of the first stack 11),

[0068] Figure 1-3 Taking the Y-axis direction as an example, but not limited to the direction shown in the figure), the first stacked sheet 11 extends with a first empty foil 111; along the first direction of the second stacked sheet 12 (specifically, it can be the length direction or the width direction of the second stacked sheet). Figure 1-3 Taking the Y-axis direction as an example (but not limited to the direction shown in the figure), the second stack body 12 extends with second empty foils 121. These empty foils are connected to the external electrode tabs 4, allowing the cells to be connected in parallel before packaging, thereby simplifying the subsequent sealing process and enhancing the stability of the cell connection. Furthermore, within each stack body (the first stack body 11 and the second stack body 12), the positive and negative electrode empty foils are stacked and welded to enhance conductivity and mechanical stability, thus providing a good connection surface for engagement with the external electrode tabs 4.

[0069] Among them, such as Figure 4 As shown, the first stack 11 and the second stack 12 are constructed by repeatedly stacking a positive electrode, a separator 15, and a negative electrode. The first empty foil 111 is formed by stacking and welding together an extended section 131 of the positive electrode 13. The second empty foil 121 is formed by stacking and welding together an extended section 141 of the negative electrode 14. Thus, the first empty foil 111 and the second empty foil 121 serve as the positive electrode of the parallel-connected battery cell, thereby achieving a positive and negative electrode connection. The external tab 4 includes a positive external tab 414 and a negative external tab 4. The positive external tab 414 is used to connect the first empty foil 111, and the negative external tab 4 is used to connect the second empty foil 121. In this way, after encapsulation, the battery cell can achieve a complete electrical circuit through the positive and negative external tabs 414 and 4.

[0070] Furthermore, in order to ensure the stability and sealing of the battery cell within the housing 3, along the first direction of the housing 3 (specifically, the length or width direction of the housing). Figure 2 Taking the Y-axis direction as an example (but not limited to the direction shown in the figure), the housing 3 has a top sealing area 32, through which the external electrode 4 passes. This design allows the external electrode 4 to smoothly pass through the top sealing area 32 of the housing 3 during the packaging process, thereby realizing the connection between the battery cell and the external circuit. At the same time, the design of the top sealing area 32 also ensures the sealing of the battery cell during the packaging process, preventing electrolyte leakage and ensuring the safe use of the battery.

[0071] Other aspects that are the same as in Embodiment 1 will not be described again in this application. Embodiment 3

[0072] like Figure 1-5 As shown, unlike Embodiment 1, in order to further improve the parallel stability of the internal parallel cell structure 100, further, in this application, along the second direction of the first stack body 11 (the direction perpendicular to the Y-axis), in Figure 1-3 Taking the X-axis direction as an example), the first stacked body 11 extends with a first positive electrode empty foil 112 and a first negative electrode empty foil 123; along the second direction of the second stacked body 12 (the direction perpendicular to the Y-axis, in Figure 1-3 (Taking the X-axis direction as an example), the second stacked body 12 extends and is provided with a second positive electrode empty foil 122 and a second negative electrode empty foil 123; the second positive electrode empty foil 122 is connected to the first positive electrode empty foil 112 through the connecting tab 2, and the second negative electrode empty foil 123 is connected to the first negative electrode empty foil 113 through the connecting tab 2.

[0073] Specifically, the first positive empty foil 112 and the second positive empty foil 122, and the first negative empty foil 123 and the second negative empty foil are connected by connecting tabs 2, respectively. This method allows current to be transmitted in parallel from the two cells, improving the overall design efficiency. Specifically, by connecting the positive empty foils (first positive empty foil 112 and second positive empty foil 122) in the first and second stacked bodies 12, the flow of positive charge can be freely switched; correspondingly, by connecting the negative empty foils (first negative empty foil 123 and second negative empty foil), the flow of negative charge is synchronized.

[0074] Furthermore, the connecting tab 2 includes a connecting body 21 and positioning bodies 22 disposed at both ends of the connecting body 21 along its length (X-axis direction). The positioning bodies 22 are used to connect the first positive empty foil 112 to the second positive empty foil 122 or to connect the first negative empty foil 123 to the second negative empty foil. In specific implementation, the positioning bodies 22 are welded or laser welded to ensure that the first stacked foil 11 and the second stacked foil 12 are firmly connected together, further improving the conductivity of the connecting body 21.

[0075] Furthermore, the connector 21 is provided with a sealing area 211, and the sealing area 211 is provided with tab adhesive. By applying tab adhesive to the sealing area 211 of the connecting tab 2, the connection strength between the connecting tab 2 and the empty foil can be further strengthened, ensuring the stability of the battery cell during operation. In addition, the use of tab adhesive can also play a certain role in insulation, preventing short circuits that may occur when the battery cell is operating under high load.

[0076] Furthermore, a protective adhesive area 23 is provided at the connection point between the connecting tab 2 and the first positive electrode empty foil 112 and / or the connection point with the second positive electrode empty foil 122; a protective adhesive area 23 is also provided at the connection point between the connecting tab 2 and the first negative electrode empty foil 123 and / or the connection point with the second negative electrode empty foil; wherein, the protective adhesive area 23 is provided with protective adhesive. Moreover, the provision of the protective adhesive area 23 can effectively prevent wear or corrosion of the connection points caused by vibration or temperature changes during battery cell operation, thereby extending the battery's service life. In addition, the protective adhesive not only provides additional mechanical protection but also absorbs, to a certain extent, the thermal expansion generated during charging and discharging of the battery cell, reducing battery cell damage caused by thermal stress. Furthermore, the use of protective adhesive also helps prevent electrolyte leakage, ensuring the battery's safety performance.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An internal parallel cell structure, characterized in that, include: The first stacked plate (11), the second stacked plate (12), and the shell (3); The first stacked body (11) and the second stacked body (12) are connected in parallel via connecting tabs (2); The housing (3) is provided with at least two assembly cavities (31), which are used to assemble the first stacked body (11) and the second stacked body (12).

2. The internal parallel cell structure according to claim 1, characterized in that, Both the first stacked sheet body (11) and the second stacked sheet body (12) include a positive electrode sheet (13), a negative electrode sheet (14), and a separator (15) disposed between the positive electrode sheet (13) and the negative electrode sheet (14).

3. The internal parallel cell structure according to claim 2, characterized in that, Along the first direction of the first stacked sheet body (11), a first empty foil (111) is provided extending from the first stacked sheet body (11); along the first direction of the second stacked sheet body (12), a second empty foil (121) is provided extending from the second stacked sheet body (12). Both the first empty foil (111) and the second empty foil (121) are used to connect to the external electrode (4).

4. The internal parallel cell structure according to claim 3, characterized in that, Along the first direction of the housing (3), the housing (3) is provided with a top sealing area (32), and an external electrode (4) passes through the top sealing area (32).

5. The internal parallel cell structure according to claim 3, characterized in that, The first empty foil (111) is formed by stacking and welding together the positive electrode empty foil segments (131) extending from the positive electrode (13), and the second empty foil (121) is formed by stacking and welding together the negative electrode empty foil segments (141) extending from the negative electrode (14).

6. The internal parallel cell structure according to claim 3, characterized in that, The external tab (4) includes a positive external tab (41) and a negative external tab (42). The positive external tab (41) is used to connect to the first empty foil (111), and the negative external tab (42) is used to connect to the second empty foil (121).

7. The internal parallel cell structure according to claim 3, characterized in that, Along the second direction of the first stacked sheet body (11), the first stacked sheet body (11) is provided with a first positive electrode empty foil (112) and a first negative electrode empty foil (113); Along the second direction of the second stacked body (12), the second stacked body (12) extends to provide a second positive electrode empty foil (122) and a second negative electrode empty foil (123); the second positive electrode empty foil (122) is connected to the first positive electrode empty foil (112) through the connecting tab (2), and the second negative electrode empty foil (123) is connected to the first negative electrode empty foil (113) through the connecting tab (2).

8. The internal parallel cell structure according to claim 7, characterized in that, The connecting tab (2) includes a connecting body (21) and positioning bodies (22) disposed at both ends of the connecting body (21) along its length. The positioning body (22) is used to connect the first positive electrode empty foil (112) to the second positive electrode empty foil (122) or to connect the first negative electrode empty foil (113) to the second negative electrode empty foil (123).

9. The internal parallel cell structure according to claim 8, characterized in that, The connector (21) is provided with a sealing area (211), and the sealing area (211) is provided with tab adhesive.

10. The internal parallel cell structure according to claim 7, characterized in that, The connection point of the connecting tab (2) to the first positive electrode empty foil (112) and / or to the second positive electrode empty foil (122) is provided with a protective adhesive area (23); The protective adhesive area (23) is provided with protective adhesive.

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