Sealing plate, cover plate assembly and blade cell

Abstract

This utility model relates to a sealing plate, a cover plate assembly, and a blade battery. It includes a sealing plate body, with an annular recessed platform at one end along a first direction, a welding surface on the outer side of the sealing plate body, and a guide angle at the end of the sealing plate body away from the annular recessed platform along the first direction. This application features a novel design with two terminal tabs, one of which is a cover plate. The terminal post adopts a hollow, racetrack-shaped structure, and a double-layer seal with inner and outer rings is designed inside the cover plate assembly. The inner sealing ring prevents air leakage due to poor welding between the terminal post and the welding block, while the outer ring prevents air leakage between the welding block and the cover plate body, resulting in good overall manufacturing reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to sealing plates, cover plate assemblies and blade batteries. Background Technology

[0002] Blade battery, also known as blade-shaped lithium iron phosphate battery, is a specially designed lithium-ion battery. It is long and thin in shape and can be inserted into the battery pack like a "blade", hence the name. It uses lithium iron phosphate as the cathode material.

[0003] With the development of technology, people are becoming increasingly eager for faster battery charging. Currently, the blade battery technology is characterized by its thinness and the fact that its cover plate and terminals are mostly circular, which cannot meet the requirements of overcurrent. Furthermore, the tabs and terminals need to be connected by connecting pieces, resulting in many parts, complicated installation procedures, and high internal resistance. In addition, the terminals cannot be processed in one step and require secondary processing, which increases the processing cost.

[0004] In summary, the traditional blade battery design has obvious drawbacks such as complex structure and high processing cost, and cannot meet the usage requirements. Utility Model Content

[0005] Based on this, it is necessary to address the technical problems of connecting tabs and terminals, such as the need for connecting plates, numerous components, high internal resistance, and high processing costs. This paper proposes a sealing plate, cover plate assembly, and blade battery, which changes the structural design, greatly reduces the battery's internal resistance, reduces processing steps, ensures the reliability of welding the sealing plate to other components, and significantly improves the battery's performance to meet usage requirements.

[0006] The technical solution adopted in this application is as follows:

[0007] The first aspect of this application provides a sealing plate, including a sealing plate body.

[0008] An annular recessed platform is provided at one end of the sealing plate body along the first direction.

[0009] The outer side of the sealing plate body is provided with a sealing plate welding surface.

[0010] A guide angle is provided at the end of the sealing plate body away from the annular recess of the sealing plate along the first direction.

[0011] As a further improvement to the above technical solution:

[0012] The sealing plate body adopts a one-piece structure.

[0013] The cross-section of the sealing plate body perpendicular to the first direction has a racetrack-shaped structure.

[0014] The depth L of the annular recess of the sealing plate along the first direction is greater than or equal to 0.15 mm, and the width W of the annular recess of the sealing plate along the second direction perpendicular to the first direction is greater than or equal to 0.5 mm.

[0015] The thickness H of the sealing plate body along the first direction is greater than or equal to 2 mm.

[0016] The second aspect of this application provides a cover plate assembly, which includes the sealing plate described above. The cover plate assembly also includes an electrode post and a cover plate body. The cover plate body is provided with a mounting hole, the electrode post is fixed in the mounting hole, the electrode post has a through hole in a first direction, and the sealing plate is welded in the through hole.

[0017] As a further improvement to the above technical solution:

[0018] A sealing ring and a welding block are installed on the outer surface of the pole along the second direction; a first plastic part and a second plastic part are respectively arranged at the upper and lower ends of the cover plate body along the first direction.

[0019] Laser seam welding is used to seal the welded surface of the sealing plate and the inner surface of the through hole of the pole.

[0020] The inner surface of the through hole of the pole is provided with a pole welding slope. The welding surface of the sealing plate and the pole welding slope cooperate to form a welding surface. The height h of the welding surface in the first direction is greater than or equal to 0.8 mm.

[0021] A third aspect of this application provides a blade battery, including a housing, an electrode assembly, and a cover plate assembly. The electrode assembly is arranged inside the housing, and electrode tabs are located at both ends of the electrode assembly. One end of the electrode tab is connected to a sealing plate.

[0022] The beneficial effects of this application are as follows:

[0023] This application provides a novel sealing cap structure, which is simple in overall structure, easy to manufacture and install, and low in cost.

[0024] This application presents a novel design with two outlet tabs, one of which is a cover plate. The pole adopts a hollow racetrack-shaped structure design and features a double-layer seal with inner and outer rings inside the cover plate assembly. The inner ring seal is designed to prevent air leakage caused by poor welding between the pole and the welding block, while the outer ring prevents air leakage between the welding block and the cover plate body. The overall processing reliability is good.

[0025] This application eliminates the connecting piece, and the electrode tab is directly welded to the sealing plate, which reduces the internal resistance of the product, reduces welding processes and components, and greatly reduces costs.

[0026] This application involves welding the sealing plate to the terminal post. However, because welding the terminal post and the sealing plate may involve welding defects such as porosity and explosion points, and there is a risk of air leakage at the weld, the matching parameters of the terminal post and the sealing plate, as well as the parameters of the sealing plate, have been set to ensure the reliability of the welding between the sealing plate and the terminal post and improve the performance of the battery. Attached Figure Description

[0027] Figure 1 This is a schematic diagram (front view) of the sealing plate in one embodiment of this application.

[0028] Figure 2 This is a schematic diagram (reverse side) of the sealing plate in one embodiment of this application.

[0029] Figure 3 This is a top view of the sealing plate in one embodiment of this application.

[0030] Figure 4 for Figure 3 Full sectional view along section AA.

[0031] Figure 5 This is a schematic diagram of the blade battery structure in one embodiment of this application.

[0032] Figure 6 for Figure 5 A partial view.

[0033] Figure 7 for Figure 5 Cross-sectional view.

[0034] Figure 8 for Figure 7 A magnified view of part B in the middle.

[0035] Figure label:

[0036] 10. Sealing plate body;

[0037] 11. Annular recessed platform of sealing plate; 12. Welding surface of sealing plate; 13. Guide angle;

[0038] 20. Pole post;

[0039] 21. Pole post recess; 22. Pole post welding bevel;

[0040] 30. First plastic part;

[0041] 40. Cover plate body;

[0042] 50. Sealing ring;

[0043] 60. Welding blocks;

[0044] 70. Second plastic part;

[0045] 80. Pole group;

[0046] 90. Shell;

[0047] 100. Cover plate assembly;

[0048] 200. Blade Battery. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0055] Example 1:

[0056] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the sealing plate of this embodiment includes a sealing plate body 10. One end of the sealing plate body 10 along the first direction is provided with a sealing plate annular recess 11. The outer side of the sealing plate body 10 is provided with a sealing plate welding surface 12. The end of the sealing plate body 10 along the first direction and away from the sealing plate annular recess 11 is provided with a guide angle 13 to facilitate the assembly between the sealing plate and the pole post 20. Its overall structure is simple and easy to manufacture.

[0057] The sealing plate body 10 adopts an integrated structure, which is simple in structure and easy and reliable to install.

[0058] The sealing plate body 10 has a racetrack-shaped cross-section perpendicular to the first direction. Specifically, in this embodiment, any cross-section of the sealing plate body 10 perpendicular to the first direction has an elliptical structure, which has a good fit with the pole post 20.

[0059] The depth L of the annular recess 11 of the sealing plate along the first direction is greater than or equal to 0.15 mm, and the width W of the annular recess 11 along the second direction perpendicular to the first direction is greater than or equal to 0.5 mm. The thickness H of the sealing plate body 10 along the first direction is greater than or equal to 2 mm. This ensures the welding strength between the sealing plate and the busbar and prevents laser penetration of the sealing plate, which could affect product performance.

[0060] The welding surface 12 of the sealing plate is an inclined surface. The angle between the welding surface 12 of the sealing plate and the plane containing the central axis of the sealing plate body 10 is 2°-75°, preferably 3°. The two fit tightly together and the welding effect is good.

[0061] The sealing plate has a compact overall structure, which allows for good fit with the pole post 20, and the processing and installation costs are low.

[0062] Example 2:

[0063] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the cover plate assembly 100 of this embodiment includes the sealing plate of Embodiment 1. The cover plate assembly 100 also includes the pole post 20 and the cover plate body 40. The cover plate body 40 is provided with a mounting hole. The pole post 20 is fixed in the mounting hole. The pole post 20 has a through hole in a first direction. The sealing plate is welded in the through hole.

[0064] A sealing ring 50 and a welding block 60 are installed on the outer surface of the pole post 20 along the second direction; a first plastic part 30 and a second plastic part 70 are respectively arranged at the upper and lower ends of the cover plate body 40 along the first direction.

[0065] The pole post 20 adopts a hollow racetrack-shaped structure design. The pole post 20 is equipped with riveting ribs. The assembly is achieved by folding the riveting ribs and connecting them to the welding block 60, and then melting and fixing the pole post 20 and the welding block 60 together by laser welding, thereby realizing the assembly of the cover plate assembly 100.

[0066] In this embodiment, the cover plate assembly 100 is designed with double-layer sealing of inner and outer rings. The inner ring sealing ring is designed to prevent air leakage caused by poor welding between the pole post 20 and the welding block 60, while the outer ring is designed to prevent air leakage between the welding block 60 and the cover plate body 40.

[0067] In addition, the sealing plate welding surface 12 and the inner surface of the through hole of the pole post 20 are sealed by laser seam welding. The inner surface of the through hole of the pole post 20 is provided with a pole post welding slope 22. The sealing plate welding surface 12 and the pole post welding slope 22 cooperate to form a welding surface. The height h of the welding surface in the first direction is greater than or equal to 0.8 mm, ensuring that the weld has sufficient weld width and depth.

[0068] The through hole of the pole post 20 is provided with a pole post countersunk platform 21, which is aligned with the annular countersunk platform 11 of the sealing plate. The depth of both the pole post countersunk platform 21 and the annular countersunk platform 11 of the sealing plate is greater than or equal to 0.15 mm and the width is greater than or equal to 0.5 mm, to prevent the weld point from protruding from the large surface of the sealing plate, so as not to affect the welding of the Busbar.

[0069] By setting the mating parameters of the terminal post 20 and the sealing plate, as well as the parameters of the sealing plate, the reliability of the welding between the sealing plate and the terminal post 20 was ensured, and the performance of the battery was improved.

[0070] Example 3:

[0071] like Figure 5 , Figure 6 and Figure 7 As shown, the blade battery 200 of this embodiment includes a housing 90, an electrode group 80, and a cover plate assembly 100. The electrode group 80 is arranged inside the housing 90, and electrode tabs are located at both ends of the electrode group 80. One end of the electrode tab is connected to a sealing plate.

[0072] In this embodiment, the structure of the other end of the pole group 80 may be the same as that of the cover plate assembly 100 or may be different from that of the cover plate assembly 100.

[0073] Compared with the prior art, this application eliminates the design of the connecting piece, and the electrode tab is directly welded to the sealing plate. This reduces the internal resistance of the product, reduces welding processes and components, greatly reduces costs, and ensures the reliability of welding the sealing plate to other components, thereby improving battery performance.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A sealing plate, characterized in that Including the sealing plate body, An annular recessed platform is provided at one end of the sealing plate body along the first direction. The outer side of the sealing plate body is provided with a sealing plate welding surface. A guide angle is provided at the end of the sealing plate body away from the annular recess of the sealing plate along the first direction.

2. The seal plate of claim 1, wherein The sealing plate body adopts a one-piece structure.

3. The seal plate of claim 1, wherein The cross-section of the sealing plate body perpendicular to the first direction has a racetrack-shaped structure.

4. The seal plate of claim 1, wherein The depth L of the annular recess of the sealing plate along the first direction is greater than or equal to 0.15 mm, and the width W of the annular recess of the sealing plate along the second direction perpendicular to the first direction is greater than or equal to 0.5 mm.

5. The seal plate of claim 1, wherein The thickness H of the sealing plate body along the first direction is greater than or equal to 2 mm.

6. A cover assembly characterized by, The cover plate assembly includes the sealing plate according to any one of claims 1-5. The cover plate assembly further includes an electrode post and a cover plate body. The cover plate body is provided with a mounting hole. The electrode post is fixed in the mounting hole. The electrode post has a through hole in a first direction. The sealing plate is welded in the through hole.

7. The cover plate assembly of claim 6, wherein, A sealing ring and a welding block are installed on the outer surface of the pole along the second direction; a first plastic part and a second plastic part are respectively arranged at the upper and lower ends of the cover plate body along the first direction.

8. The cover plate assembly of claim 6, wherein, Laser seam welding is used to seal the welded surface of the sealing plate and the inner surface of the through hole of the pole.

9. The cover plate assembly of claim 8, wherein, The inner surface of the through hole of the pole is provided with a pole welding slope. The welding surface of the sealing plate and the pole welding slope cooperate to form a welding surface. The height h of the welding surface in the first direction is greater than or equal to 0.8 mm.

10. A bladed battery characterized by, It includes a housing, an electrode assembly, and a cover plate assembly as described in any one of claims 6-9. The electrode assembly is arranged inside the housing, and electrode tabs are located at both ends of the electrode assembly. One end of the electrode tab is connected to a sealing plate.

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