Battery injection molding packaging structure

Abstract

The utility model relates to a battery injection molding packaging structure which comprises a battery cell, one end defining the height direction of the battery cell as a top surface, a packaging bag, a protection plate assembly and an injection molding piece, the packaging bag wraps the outer side of the battery cell, the packaging bag comprises a top sealing part located on the top surface, the battery cell comprises a pole lug, and the pole lug is connected with the protection plate assembly. The tab extends out of the top sealing part and is connected with the protection plate assembly, the projections of the protection plate assembly, the tab and the top sealing part in the height direction are all located on the inner side of the top surface, and the outer sides of the protection plate assembly, the tab and the top sealing part are wrapped with the injection molding part. The battery pack is simple in structure, stable and reliable in structure, good in waterproof performance, small in occupied space and beneficial to improvement of battery capacity, and the top sealing part, the tabs and the protection plate can be effectively fixed.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery injection molding packaging structure. Background Technology

[0002] A pouch battery is a type of battery that uses an aluminum-plastic film to package the battery cell. Its top surface has a top seal formed by heat-sealing the aluminum-plastic film, and the battery cell's tabs extend from the top seal and connect to the protection board. During the manufacturing process of pouch batteries, adhesive tape is typically used to bond the top seal and the protection board, thus securing them together. Waterproof tape is also wrapped around the outside of the protection board and the top seal to improve the battery's waterproof performance. However, this method is complex, difficult to operate, resulting in low production efficiency and structural instability, making it prone to deformation under external forces, thus affecting product quality. Utility Model Content

[0003] The purpose of this utility model is to provide a battery injection molding packaging structure, which has a simple structure, can effectively fix the top seal, the tabs and the protection plate, has a stable and reliable structure, good waterproof performance, and occupies little space, which is conducive to improving battery capacity.

[0004] A battery injection molding packaging structure includes a battery cell, defining one end of the battery cell in the height direction as a top surface, and further includes a packaging bag, a protective plate assembly, and an injection molded part. The packaging bag wraps around the outside of the battery cell and includes a top seal located on the top surface. The battery cell includes a tab that extends from the top seal and connects to the protective plate assembly. The projections of the protective plate assembly, the tab, and the top seal in the height direction are all located inside the top surface. The injection molded part wraps around the outside of the protective plate assembly, the tab, and the top seal.

[0005] In the above technical solution, the injection-molded part wraps around the top seal, tabs, and protective plate assembly, providing stable support for these components, enhancing structural strength, and providing protection. The injection-molded part completely encloses the components, preventing moisture ingress and improving waterproofing. The projections of the protective plate assembly, tabs, and top seal in the height direction are all located inside the top surface, ensuring that the injection-molded part, after molding, is positioned above the top surface, effectively reducing the space occupied and facilitating larger battery sizes and increased cell capacity. The injection-molded part has a simple structure, is easy to manufacture, simplifies production processes, and improves production efficiency.

[0006] Furthermore, the top sealing portion includes a first section, a second section, and a bent section. The first section extends outward perpendicular to the top surface. The two ends of the bent section are respectively connected to the first section and the second section. The second section is parallel to the top surface. The injection molded part extends between the second section and the top surface.

[0007] In the above technical solution, the bending of the top seal section makes the second section close to and parallel to the top surface, which reduces the space occupied by the top seal on the top of the battery and helps to reduce the size of the battery. The injection molded part extends between the second section and the top surface, which on the one hand tightens the second section and makes the overall structure more stable, and on the other hand, the injection molded part can abut against the top surface, thereby preventing the injection molded part from shaking and improving the stability and reliability of the structure.

[0008] Furthermore, the protective plate assembly has a connector on the side facing the top seal, and the connector is electrically connected to the tab.

[0009] In the above technical solution, the protection plate is electrically connected to the electrode tab through a connector. Under the protection of the injection molded part, the connection can be kept stable and the reliability of the product can be improved.

[0010] Furthermore, the electrode extends out from the top seal and then bends in the opposite direction to form a connecting section. The connecting section extends in a direction parallel to the top surface and is electrically connected to the connector.

[0011] In the above technical solution, the connecting section extends in a direction parallel to the top surface after bending, which can reduce the height of the overall structure and is beneficial to the control of battery volume.

[0012] Furthermore, an adhesive is provided between the connector and the top sealing part.

[0013] In the above technical solution, before the injection molded part is formed, the adhesive part can fix the connector and the top seal, thereby fixing the protective plate assembly and ensuring the stability of the protective plate in the injection molding process.

[0014] Furthermore, the protection board assembly includes a main board and a flexible board stacked together, with the flexible board located on the side of the main board closer to the battery cell.

[0015] Furthermore, one end of the flexible board is provided with a connector, which extends outward from the outside of the injection molded part.

[0016] In the above technical solution, the connector extends outward from the injection molded part, which facilitates its connection to external devices and makes it more convenient to use.

[0017] Furthermore, the connector is connected to the flexible board via a flexible connection portion, which has at least one arc-shaped portion.

[0018] In the above technical solution, the flexible connection portion can change its angle as needed, facilitating the connection between the connector and external devices. The flexible connection portion is formed by at least one arc-shaped portion, giving it redundancy and allowing it to expand and contract as needed to meet different connection distance requirements.

[0019] Furthermore, the projection of the injection molded part in the height direction is located inside the top surface.

[0020] In the above technical solution, the projection of the injection molded part in the height direction is located inside the top surface, so that the entire injection molded part is located above the top surface, thereby effectively reducing the space occupied and facilitating the increase of battery size.

[0021] Furthermore, the packaging bag is made of aluminum-plastic film.

[0022] Compared with existing technologies, the beneficial effects of this utility model are as follows: The injection-molded part, wrapped around the top seal, electrode tabs, and protective plate assembly, provides stable support for these components, enhances structural strength, and provides protection. The injection-molded part completely encloses the components, preventing moisture ingress and improving waterproofing. The projections of the protective plate assembly, electrode tabs, and top seal in the height direction are all located inside the top surface, ensuring that the injection-molded part, after molding, is positioned above the top surface, effectively reducing the space occupied and facilitating larger battery sizes and increased cell capacity. The injection-molded part has a simple structure, is easy to manufacture, simplifies production processes, and improves production efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery injection molding packaging structure according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the hidden injection molded part according to an embodiment of the present utility model.

[0025] Figure 3 for Figure 2 A magnified view of part A in the diagram.

[0026] Figure 4 This is a cross-sectional schematic diagram of the battery injection molding packaging structure according to an embodiment of the present invention.

[0027] Explanation of icon numbers:

[0028] 1. Battery cell, 11. Top surface, 12. Electrode, 121. Connecting section, 2. Packaging bag, 21. Top seal, 211. First section, 212. Second section, 213. Bending section, 213. Protection board assembly, 31. Connector, 32. Main board, 33. Flexible board, 34. Connector, 35. Flexible connection, 36. Arc-shaped part, 4. Injection molded part, 5. Adhesive part. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] Please refer to Figures 1 to 4 In a preferred embodiment, the battery injection molding packaging structure of this utility model mainly includes a battery cell 11, a packaging bag 2, a protection plate assembly 3, and an injection molded part 4. For ease of explanation, one end of the battery cell 11 in the height direction is defined as the top surface. The packaging bag 2 wraps around the outside of the battery cell 11 and includes a top sealing portion 21 located on the top surface. The battery cell 11 includes a tab 12, which extends from the top sealing portion 21 and connects to the protection plate assembly 3. The projections of the protection plate assembly 3, the tab 12, and the top sealing portion 21 in the height direction are all located inside the top surface. The injection molded part 4 wraps around the outside of the protection plate assembly 3, the tab 12, and the top sealing portion 21.

[0032] For example, the battery cell 11 is formed as a cuboid, from Figure 1 Viewed from the top, the upper end of the battery cell 11 forms the top surface. The packaging bag 2 can use existing packaging materials for the battery cell 11; in this embodiment, the packaging bag 2 is an aluminum-plastic film. The packaging bag 2 wraps around the outside of the battery cell 11, and its upper end is heat-sealed to form a top seal 21 extending along the length of the battery cell 11. The top of the battery cell 11 is provided with two tabs 12, specifically, two tabs 12, which are respectively connected to the positive and negative terminals of the battery cell 11. The tabs 12 extend from the top seal 21 and are connected to the protection board assembly 3. The protection board assembly 3 is used to control and monitor the charging and discharging state of the battery cell 11 to protect the battery cell 11.

[0033] Injection molded part 4 can be formed by injection molding with insulating material. It wraps around the top seal 21, the tabs 12, and the protective plate assembly 3, providing stable support for these components, increasing structural strength, and providing protection. The injection molded part 4 completely covers the components, preventing moisture ingress and improving waterproofing. The projections of the protective plate assembly 3, the tabs 12, and the top seal 21 in the height direction are all located inside the top surface, ensuring that the injection molded part 4, after molding, is positioned above the top surface, effectively reducing the space occupied and facilitating larger battery size and increased cell capacity 11. The injection molded part 4 has a simple structure, is easy to manufacture, simplifies production processes, and improves production efficiency.

[0034] Please refer to Figure 3 and Figure 4 The top sealing portion 21 includes a first segment 211, a second segment 212, and a bent segment 213. The first segment 211 extends outward perpendicular to the top surface. The two ends of the bent segment 213 connect the first segment 211 and the second segment 212, respectively. The second segment 212 is parallel to the top surface. The injection molded part 4 extends between the second segment 212 and the top surface. The bending of the bent segment 213 of the top sealing portion 21 makes the second segment 212 close to and parallel to the top surface, which can reduce the space occupied by the top sealing portion 21 on the top of the battery, thus helping to reduce the size of the battery. The injection molded part 4 extends between the second segment 212 and the top surface, which on the one hand can tighten the second segment 212, making the overall structure more stable, and on the other hand, the injection molded part 4 can abut against the top surface, thereby preventing the injection molded part 4 from shaking and improving the stability and reliability of the structure.

[0035] In this embodiment, the protective plate assembly 3 has a connector 31 on the side facing the top seal 21, and the connector 31 is electrically connected to the tab 12. For example, the connector 31 can be made of conductive metal and is generally U-shaped. One end of the tab 12 extends into the opening of the connector 31 and is welded to the connector 31. The protective plate is electrically connected to the tab 12 via the connector 31. Under the enclosure of the injection molded part 4, the connection is stable, improving the reliability of the product.

[0036] The tab 12 extends from the top seal 21 and is bent in the opposite direction to form a connecting section 121. The connecting section 121 extends in a direction parallel to the top surface and is electrically connected to the connector 31. For example, the tab 12 extends horizontally outward from the second section 212 of the top seal 21, and after being bent in the opposite direction, it forms the connecting section 121. The connecting section 121 extends in a direction parallel to the top surface and is connected to the connector 31. By bending the tab 12 to form a horizontal connecting section 121, the height of the overall structure can be reduced, which is beneficial for controlling the battery volume.

[0037] An adhesive component 5 is provided between the connector 31 and the top seal 21. Specifically, the adhesive component 5 can be double-sided adhesive tape. Before the injection molded part 4 is formed, the adhesive component 5 can pre-fix the connector 31 and the top seal 21, thereby fixing the protective plate assembly 3 and ensuring the stability of the protective plate in the injection molding process.

[0038] In this embodiment, the protection board assembly 3 includes a main board 32 and a flexible board 33 stacked together, with the flexible board 33 located on the side of the main board 32 closer to the battery cell 11. One end of the flexible board 33 is provided with a connector 34, which extends outward from the injection-molded part 4. The connector 34 extending outward from the injection-molded part 4 facilitates connection to external devices, making it more convenient to use.

[0039] The connector 34 is connected to the flexible circuit board 33 via a flexible connection portion 35, which has at least one arc-shaped portion 36. The flexible connection portion 35 can change its angle as needed, facilitating the connection of the connector 34 to external devices. The flexible connection portion 35 is formed with at least one arc-shaped portion 36, giving it redundancy and allowing it to extend and retract as needed to meet different connection distance requirements.

[0040] In this embodiment, the projection of the injection molded part 4 in the height direction is located inside the top surface, so that the injection molded part 4 is located above the top surface, thereby effectively reducing the space occupied and facilitating the increase of battery size.

[0041] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery injection packaging structure comprising a battery cell, one end of the battery cell in the direction of the height of the battery cell being defined as a top surface, characterized in that, It also includes a packaging bag, a protective plate assembly, and an injection molded part. The packaging bag wraps around the outside of the battery cell and includes a top seal on the top surface. The battery cell includes a tab that extends from the top seal and connects to the protective plate assembly. The projections of the protective plate assembly, the tab, and the top seal in the height direction are all located inside the top surface. The injection molded part wraps around the outside of the protective plate assembly, the tab, and the top seal.

2. The battery injection package structure of claim 1, wherein, The top sealing portion includes a first section, a second section, and a bent section. The first section extends outward perpendicular to the top surface. The two ends of the bent section are respectively connected to the first section and the second section. The second section is parallel to the top surface. The injection molded part extends between the second section and the top surface.

3. The battery injection package structure of claim 1, wherein, The protective plate assembly has a connector on the side facing the top seal, and the connector is electrically connected to the tab.

4. The battery injection package structure of claim 3, wherein, The electrode extends out from the top seal and then bends in the opposite direction to form a connecting section. The connecting section extends in a direction parallel to the top surface and is electrically connected to the connector.

5. The battery injection molding packaging structure according to claim 3, characterized in that, An adhesive is provided between the connector and the top sealing part.

6. The battery injection molding packaging structure according to claim 1, characterized in that, The protection board assembly includes a main board and a flexible board stacked together, with the flexible board located on the side of the main board closer to the battery cell.

7. The battery injection molding packaging structure according to claim 6, characterized in that, One end of the flexible board is provided with a connector, which extends out of the outside of the injection molded part.

8. The battery injection molding packaging structure according to claim 7, characterized in that, The connector is connected to the flexible board via a flexible connection portion, which has at least one arc-shaped portion.

9. The battery injection molding packaging structure according to claim 1, characterized in that, The projection of the injection molded part in the height direction is located inside the top surface.

10. The battery injection molding packaging structure according to claim 1, characterized in that, The packaging bag is made of aluminum-plastic film.

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