Cover plate assembly and blade battery

Abstract

A cover plate assembly and a blade battery include a cover plate body with a through hole, a terminal post connected to the through hole, and a sealing plate. The terminal post has a through groove along a first direction, and the sealing plate is welded into the through groove. A tab is welded to the bottom surface of the sealing plate perpendicular to the first direction, and a hollow cavity is formed in the through groove area on the bottom surface of the sealing plate. A bent tab is installed in the hollow cavity, resulting in good space utilization. Specifically, a through groove is formed in the center of the terminal post, and a sealing plate is welded to the upper part of the through groove. The hollow cavity is formed inside the through groove below the sealing plate, and the bent tab is installed inside the hollow cavity. No additional installation space is required for the installation and welding of the tab. Furthermore, during installation, the tab can first be passed through the through groove, and then laser-welded to the bottom surface of the sealing plate. The welded tab is then bent into the hollow cavity, and finally, laser welding is performed between the sealing plate and the terminal post. This effectively utilizes space and greatly improves space utilization.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to 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. In addition, the tabs and terminals need to be connected by connecting pieces, resulting in more parts, complicated installation process, and higher internal resistance. Furthermore, the bending of the tabs takes up a lot of space, resulting in low overall space utilization of the product.

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

[0005] Therefore, it is necessary to provide a cover plate assembly and blade battery to address the above-mentioned technical problems. The overall installation structure greatly reduces the internal resistance of the battery, reduces the number of processing steps, ensures the reliability of welding the sealing plate to other components, maximizes space utilization, and significantly improves battery 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 cover plate assembly, comprising:

[0008] The cover plate body has through holes;

[0009] The pole is inserted into the through hole of the cover plate body;

[0010] The sealing plate and the pole post have a through groove along the first direction, and the sealing plate is welded into the through groove.

[0011] The sealing plate has a welding lug on its bottom surface perpendicular to the first direction, and a hollow cavity H is formed in the through groove area on the bottom surface of the sealing plate.

[0012] The bottom surface of the sealing plate, perpendicular to the first direction, is chamfered.

[0013] As a further improvement to the above technical solution:

[0014] The electrode tabs are bent and arranged inside the hollow cavity H.

[0015] A sealing ring and a welding block are installed on the outer surface of the pole perpendicular to the first 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.

[0016] A recessed platform is provided above the through groove of the pole post.

[0017] The electrode lugs are installed inside the through groove along the first direction of the sinking platform.

[0018] The sealing plate has an annular recess at one end along the first direction and a boss at the other end along the first direction. The bottom surface of the boss along the first direction has a chamfer.

[0019] The bottom surface of the boss, perpendicular to the first direction, forms a welding surface that mates with the electrode lug.

[0020] The sealing plate has a racetrack-shaped cross-section perpendicular to the first direction.

[0021] The thickness of the sealing plate along the first direction is 3mm-5mm.

[0022] A second 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, with tabs at both ends of the electrode assembly, and one end of the tab is connected to a sealing plate.

[0023] The beneficial effects of this application are as follows:

[0024] This application provides a novel cover plate assembly with a simple overall structure, convenient manufacturing and installation, and low cost.

[0025] This application features a dedicated hollow cavity within the cover plate assembly, where a bent electrode lug is installed, resulting in excellent space utilization. Specifically, a through groove is formed in the center of the electrode post, and a sealing plate is welded to the upper part of the through groove. This hollow cavity is formed inside the through groove below the sealing plate, and the bent electrode lug is installed within the hollow cavity. No additional installation space is required for the installation and welding of the electrode lug. Furthermore, during installation, the electrode lug can first be passed through the through groove, and then laser-welded to the bottom surface of the sealing plate. The welded electrode lug is then bent into the hollow cavity, and finally, laser welding is performed between the sealing plate and the electrode post. This effectively utilizes space and significantly improves space efficiency.

[0026] 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.

[0027] 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.

[0028] In this application, the pole post and the welding block are connected by laser welding, which rivets the riveting ribs of the pole post and melts and fixes them together with the welding block, thereby realizing the assembly of the cover plate assembly and achieving good installation reliability.

[0029] 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

[0030] Figure 1 This is a schematic diagram of the blade battery structure in one embodiment of this application (installed state).

[0031] Figure 2 for Figure 1 A partial view.

[0032] Figure 3 for Figure 2 Cross-sectional view.

[0033] Figure 4 This is a schematic diagram of the blade battery structure in one embodiment of this application (with the sealing plate not installed).

[0034] Figure 5 for Figure 4 A partial view.

[0035] Figure 6 for Figure 5 Cross-sectional view.

[0036] Figure 7 This is a schematic diagram (front view) of the sealing plate in one embodiment of this application.

[0037] Figure 8 This is a schematic diagram (reverse side) of the sealing plate in one embodiment of this application.

[0038] Figure 9 This is a cross-sectional view of the sealing plate in one embodiment of this application.

[0039] Figure 10 This is a schematic diagram of the installation of the pole post in one embodiment of this application.

[0040] Figure 11 for Figure 10 Cross-sectional view.

[0041] Figure 12 for Figure 11A magnified view of part A in the middle.

[0042] Figure label:

[0043] 10. Blade Battery;

[0044] 20. Pole post;

[0045] 21. Sunken platform;

[0046] 30. Sealing plate;

[0047] 31. Annular recessed platform; 32. Boss; 33. Chamfer;

[0048] 40. Shell;

[0049] 50. Cover plate body;

[0050] 60. Second plastic part;

[0051] 70. First plastic part;

[0052] 80. Sealing ring;

[0053] 90. Extreme ear;

[0054] 100, Pole Group;

[0055] 110. Welding block. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] like Figure 1 As shown, the first direction defined in this embodiment is the axial direction of the blade battery 10.

[0063] Example 1:

[0064] like Figures 1-12 As shown, the cover plate assembly of this embodiment includes:

[0065] The cover plate body 50 has a through hole; the cover plate body 50 can be made of conductive material or insulating material, and can be replaced according to different actual applications, making it flexible in use.

[0066] The pole post 20 is inserted through the through hole in the cover plate body 50; the pole post 20 adopts an integrated structure, which is compact and easy to manufacture.

[0067] The sealing plate 30 and the pole post 20 have a through groove along the first direction, and the sealing plate 30 is welded into the through groove.

[0068] The electrode tab 90 is welded to the bottom surface of the sealing plate 30 perpendicular to the first direction. The through groove area on the bottom surface of the sealing plate 30 forms a hollow cavity H. The electrode tab 90 is bent and arranged in the hollow cavity H. In this way, the electrode tab 90 does not need additional space to be placed. After bending, it is directly arranged in the hollow cavity H, which greatly utilizes the space between the electrode post 20 and the sealing plate 30, resulting in a high space utilization rate.

[0069] The sealing plate 30 has a chamfer 33 on its bottom surface perpendicular to the first direction. This facilitates the formation of a relatively flat welding surface, making welding with the tab 90 easier and ensuring welding accuracy and reliable contact between the sealing plate 30 and the tab 90.

[0070] The pole post 20 is fitted with a sealing ring 80 and a welding block 110 on its outer surface perpendicular to the first direction. The cover plate body 50 is also provided with a first plastic part 70 and a second plastic part 60 at its upper and lower ends along the first direction, respectively. The overall installation is convenient and quick, and has good reliability.

[0071] like Figure 6 As shown, a recessed platform 21 is provided above the through groove of the pole post 20. The recessed platform 21 is tightly fitted with the sealing plate 30 and connected by laser welding.

[0072] The tab 90 is installed inside the through groove along the first direction of the sinking platform 21, which can ensure the installation reliability between the sealing plate 30 and the pole post 20.

[0073] An annular recess 31 is provided at one end of the sealing plate 30 along the first direction. The annular recess 31 is flush with the top surface of the pole post 20, which facilitates welding.

[0074] A boss 32 is provided at the other end of the sealing plate 30 along the first direction, and a chamfer 33 is provided on the bottom surface of the boss 32 along the first direction. The bottom surface of the boss 32 perpendicular to the first direction forms a welding surface that mates with the tab 90. The chamfer 33 design can effectively highlight the welding surface, reliably laser weld the bottom surface of the boss 32 to the tab 90, and prevent interference or other effects when the tab 90 is bent.

[0075] The sealing plate 30 has a racetrack-shaped cross-section perpendicular to the first direction.

[0076] In this embodiment, the sealing plate 30 has an elliptical structure in any cross-section perpendicular to the first direction, resulting in high overall strength.

[0077] The thickness of the sealing plate 30 along the first direction is 3mm-5mm to ensure the strength of the sealing plate 30.

[0078] Example 2:

[0079] The blade battery 10 of this embodiment includes a housing 40, an electrode assembly 100, and a cover plate assembly as described in Embodiment 1. The electrode assembly 100 is arranged inside the housing 40, and electrode tabs 90 are located at both ends of the electrode assembly 100. One end of the electrode tab 90 is connected to the sealing plate 30.

[0080] In this embodiment, the structure of the other end of the pole group 100 may be the same as or different from that of the cover plate assembly.

[0081] This application addresses the problems existing in the prior art by providing a novel solution. The pole post 20 adopts a hollow racetrack-shaped structure design. The pole tab 90 passes through the hollow cavity H and is laser-welded to the sealing plate 30. After welding, the pole tab 90 is bent inside the hollow cavity H, effectively utilizing space and improving space utilization. Finally, the sealing plate 30 is welded to the pole post 20 to achieve a seal.

[0082] Meanwhile, the pole post 20 and the welding block 110 are connected by laser welding to fused and solidify the riveting ribs of the pole post 20 and the welding block 110, thereby realizing the assembly of the cover plate assembly. The assembly has good reliability and long service life.

[0083] Compared with the prior art, this application eliminates the design of the connecting piece, and the tab 90 is directly welded to the sealing plate 30. This reduces the internal resistance of the product, reduces the welding process and parts, greatly reduces the cost, and ensures the reliability of welding the sealing plate 30 to other components, thereby improving the performance of the battery.

[0084] 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.

[0085] 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 cover assembly, characterized by include: The cover plate body has through holes; The pole is inserted into the through hole of the cover plate body; The sealing plate and the pole post have a through groove along the first direction, and the sealing plate is welded into the through groove. The electrode lugs are welded to the bottom surface of the sealing plate perpendicular to the first direction, and the through groove area on the bottom surface of the sealing plate forms a hollow cavity. The bottom surface of the sealing plate, perpendicular to the first direction, is chamfered.

2. The cover plate assembly of claim 1, wherein, The electrode tabs are bent and arranged inside the hollow cavity.

3. The cover plate assembly of claim 1, wherein, A sealing ring and a welding block are installed on the outer surface of the pole perpendicular to the first 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.

4. The cover plate assembly of claim 1, wherein, A recessed platform is provided above the through groove of the pole in the first direction.

5. The cover plate assembly of claim 4, wherein, The electrode lugs are installed inside the through groove along the first direction of the sinking platform.

6. The cover plate assembly of claim 1, wherein, The sealing plate has an annular recess at one end along the first direction and a boss at the other end along the first direction. The bottom surface of the boss along the first direction has a chamfer.

7. The cover plate assembly of claim 6, wherein, The bottom surface of the boss, perpendicular to the first direction, forms a welding surface that mates with the electrode lug.

8. The cover plate assembly of claim 6, wherein, The sealing plate has a racetrack-shaped cross-section perpendicular to the first direction.

9. The cover plate assembly of claim 6, wherein, The thickness of the sealing plate along the first direction is 3mm-5mm.

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 1-9. The electrode assembly is arranged inside the housing, with electrode tabs at both ends of the electrode assembly, and one end of the electrode tab is connected to a sealing plate.

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