Cylindrical battery structure and secondary battery thereof

Abstract

The utility model belongs to the technical field of battery structures, and particularly discloses a cylindrical battery structure and a secondary battery thereof. The cylindrical battery structure comprises a shell, a roll core, a top cover, a collector plate and a sealing element, a welding through hole is formed in the top cover; the collector plate is positioned between the top cover and the roll core; an assembling groove matched with the flow collecting disc in shape is formed in the side, facing the flow collecting disc, of the top cover; the welding through hole of the top cover penetrates through the assembling groove. The collector plate is in a flat plate shape, the height space occupied by welding concave-convex positions and a folding structure is reduced, the roll core and the collector plate are tightly attached through the top cover, and gaps between the collector plate and the roll core and the top cover can be effectively reduced, so that the space in the battery is effectively utilized; the positions of the current collecting disc and the roll core are fixed by the top cover before the current collecting disc and the roll core are welded, so that when the current collecting disc and the roll core are welded, the current collecting disc does not need to be fixed by an additional clamp, the welding process is simpler, the operation is more convenient, and the assembling efficiency of the cylindrical battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a cylindrical battery structure and a secondary battery thereof. Background Art

[0002] At present, the negative electrode current collector of the existing cylindrical battery is provided with a welding plate and an extension ear welded to the winding core tab. The welding plate needs to be designed with concave and convex welding positions for contact welding with the winding core; and the extension ear is welded to the negative electrode of the cover plate, and then through one or two bending processes, the cover plate and the shell are assembled and formed. However, after the negative electrode current collector disc is folded once or multiple times, the space occupied by the negative electrode current collector disc in the height direction becomes larger, resulting in a large gap between the cover plate and the core, and the space in the battery cannot be effectively utilized; and since concave and convex welding positions need to be set for welding with the core, the core and the negative electrode current collector disc cannot be tightly fitted, and there are also many gaps between the core and the negative electrode current collector disc, which further reduces the space utilization rate; moreover, when the battery needs to be assembled, the negative electrode current collector disc and the core need to be welded and assembled first, and then the core and the negative electrode current collector disc are sealed with a shell cover. When the core and the negative electrode collector disc are welded, an additional clamp is required to fix the negative electrode current collector disc on the core, and the negative electrode collector disc is small in size and difficult to clamp and fix, resulting in a more cumbersome welding operation. Utility Model Content

[0003] The purpose of the utility model is to provide a cylindrical battery structure and a secondary battery thereof, so as to solve the technical problems in the prior art of cylindrical batteries, such as large gaps between the current collecting disk and the winding core, and between the current collecting disk and the top cover, low space utilization, and complicated welding steps of the current collecting disk.

[0004] In order to achieve the above objectives, the present invention provides a cylindrical battery structure, which includes:

[0005] A housing having an opening; an interior of the housing having a mounting cavity communicating with the opening;

[0006] a winding core, which is arranged in the installation cavity;

[0007] a top cover connected to the housing and closing the opening; the top cover is provided with a welding through hole;

[0008] a collecting tray located between the top cover and the winding core;

[0009] seals;

[0010] In which, the side of the top cover facing the collecting plate is provided with an assembly groove whose shape is adapted to the collecting plate; the top cover is used to press the collecting plate toward the winding core; the welding through hole of the top cover passes through the assembly groove; the collecting plate is flat, and the side of the collecting plate facing the winding core is provided with a first fitting surface for fitting with the winding core; the side of the collecting plate facing the top cover is provided with a second fitting surface for fitting with the assembly groove; the sealing member is provided at the welding through hole and is used to seal the welding through hole.

[0011] Preferably, the collecting plate is provided with a positioning hole, and the assembly groove is provided with a positioning column for extending into the positioning hole.

[0012] Preferably, the top cover includes a cover plate and an insulating member; the insulating member is connected to the cover plate, the insulating member is located on the side of the cover plate facing the winding core, the assembly groove is provided on the side of the insulating member facing the winding core, and the cover plate cooperates with the insulating member to press the collecting plate toward the winding core; the cover plate is provided with a first through hole, and the insulating member is provided with a second through hole connected to the first through hole, and the first through hole and the second through hole cooperate to form the welding through hole.

[0013] Preferably, the sealing member includes a sealing rubber plug; the sealing rubber plug is located in the second through hole, and the sealing rubber plug seals the second through hole.

[0014] Preferably, the sealing member further includes a sealing plate; the sealing plate is connected to the sealing rubber plug, and the sealing plate seals the first through hole.

[0015] Preferably, the sealing plate is an aluminum plate, and the sealing plate is welded to the cover plate.

[0016] Preferably, the cross-sectional area of ​​the first through hole is greater than the cross-sectional area of ​​the second through hole.

[0017] Preferably, the positioning holes are circular holes, and the number of the positioning holes is at least two, and the number of the corresponding positioning posts is also at least two.

[0018] Preferably, the number of the welding through holes is two, and the welding through holes are strip-shaped holes.

[0019] The second aspect of the present invention further provides a secondary battery, which includes the cylindrical battery structure as described above.

[0020] The cylindrical battery structure and secondary battery provided by the present invention have the following beneficial effects: the current collecting disc is flat, which reduces the height space occupied by welding concave and convex parts and the folding structure, and the top cover adopts an assembly groove to accommodate the current collecting disc, and the top cover presses the current collecting disc toward the winding core, so that the winding core and the current collecting disc are tightly fitted, which can effectively reduce the gap between the current collecting disc, the winding core and the top cover, so as to effectively utilize the space in the battery and improve the space utilization rate in the battery; and, before welding the current collecting disc and the winding core, the top cover is used to fix the position of the current collecting disc and the winding core. Therefore, when welding the current collecting disc and the winding core, there is no need to use an additional clamp to fix the current collecting disc, so that the welding assembly of the current collecting disc and the winding core can be completed after the top cover is sealed, thereby making the welding process of the current collecting disc and the winding core simpler, more convenient to operate, and improving the efficiency of cylindrical battery assembly.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the exploded structure of the cylindrical battery structure of an embodiment of the present utility model;

[0023] Figure 2 This is a partial structural schematic diagram of a cylindrical battery structure after dissection in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic structural diagram of an insulating member according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic structural diagram of the assembled insulating member and the current collecting plate of an embodiment of the present utility model;

[0026] Figure 5 It is a structural schematic diagram of a sealing member according to an embodiment of the present utility model.

[0027] In the figure, 100, shell; 110, opening; 120, installation cavity; 200, winding core; 300, top cover; 310, welding through hole; 320, assembly groove; 330, positioning column; 340, cover plate; 341, first through hole; 350, insulating member; 351, second through hole; 400, collecting plate; 410, first fitting surface; 420, second fitting surface; 430, positioning hole; 500, sealing member; 510, sealing plug; 520, sealing plate. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Please also refer to Figures 1 to 5 , the cylindrical battery structure provided by the embodiment of the present invention is now described.

[0033] like Figure 1 and Figure 2 As shown, a cylindrical battery structure according to an embodiment of the present invention includes: a housing 100, a winding core 200, a top cover 300, a current collecting plate 400, and a sealing member 500;

[0034] Reference Figures 1 to 5, wherein the shell 100 has an opening 110; the shell 100 has an installation cavity 120 connected to the opening 110; the winding core 200 is arranged in the installation cavity 120; the top cover 300 is connected to the shell 100, and the top cover 300 closes the opening 110; the top cover 300 is provided with a welding through hole 310; the collecting plate 400 is located between the top cover 300 and the winding core 200; the top cover 300 is provided with an assembly groove 320 with a shape adapted to the collecting plate 400 on the side facing the collecting plate 400; the top cover 300 Used to press the collecting plate 400 toward the winding core 200; the welding through hole 310 of the top cover 300 penetrates into the assembly groove 320; the side of the collecting plate 400 facing the winding core 200 is provided with a first fitting surface 410 for fitting with the winding core 200; the collecting plate 400 is flat, and the side of the collecting plate 400 facing the top cover 300 is provided with a second fitting surface 420 for fitting with the assembly groove 320; the sealing member 500 is provided at the welding through hole 310 and is used to seal the welding through hole 310.

[0035] The collecting tray 400 is in the shape of a flat plate, that is, neither the first fitting surface 410 nor the second fitting surface 420 of the collecting tray 400 requires a concave or convex welding position. The collecting tray 400 is installed in the assembly groove 320, so that the collecting tray 400 can be connected to the negative pole on the top cover 300. There is no need to set an additional extension ear, nor is there a need to perform a bending process on the collecting tray 400, which can effectively reduce the space occupied by the collecting tray 400 in the height direction; and the collecting tray 400 adopts the second fitting surface 420 to fit with the top cover 300 and the first fitting surface 410 to fit with the core 200, so that the core 200 and the collecting tray 400 can be tightly fitted, which can effectively reduce the gap between the collecting tray 400 and the core 200 and the top cover 300, so as to effectively utilize the space in the battery and improve the space utilization rate in the battery.

[0036] When assembling a cylindrical battery, the core 200 can be placed into the shell 100 first, and then the assembly groove 320 of the top cover 300 can be used to accommodate the collecting plate 400, and the opening 110 of the shell 100 can be sealed to complete the preliminary assembly. Then, the welding equipment can be used to pass through the welding through-hole 310 and contact the welding equipment with the collecting plate 400 in the assembly groove 320, so that the collecting plate 400 and the core 200 are welded. Finally, the sealing member 500 is used to seal the welding through-hole 310 to prevent the collecting plate 400 from being exposed, and the assembly of the cylindrical battery is completed. Therefore, when the collecting plate 400 and the core 200 are welded, the top cover 300 has been used to fix the collecting plate 400, and there is no need to use an additional clamp to fix the collecting plate 400, thereby making the welding process of the collecting plate 400 and the core 200 simpler and more convenient to operate, thereby improving the efficiency of cylindrical battery assembly.

[0037] The current collecting disk 400 of the cylindrical battery structure of this embodiment is in a flat plate shape, which reduces the height space occupied by the welding concave and convex parts, and the top cover 300 adopts the assembly groove 320 to accommodate the current collecting disk 400, and the top cover 300 presses the current collecting disk 400 toward the core 200, so that the core 200 and the current collecting disk 400 are tightly fitted, which can effectively reduce the gap between the current collecting disk 400 and the core 200 and the top cover 300, so as to effectively utilize the space in the battery and improve the space utilization rate in the battery; and, before welding the current collecting disk 400 and the core 200, the top cover 300 is used to fix the position of the current collecting disk 400 and the core 200. Therefore, when welding the current collecting disk 400 and the core 200, there is no need to use an additional clamp to fix the current collecting disk 400, thereby making the welding process of the current collecting disk 400 and the core 200 simpler and the operation more convenient, thereby improving the efficiency of cylindrical battery assembly.

[0038] It can be understood that the current collecting disk 400 of this embodiment is a negative electrode current collecting disk 400 . In addition, in other embodiments, it can be a positive electrode current collecting disk 400 .

[0039] Reference Figures 3 and 4 In some embodiments of the present invention, the current collecting tray 400 is provided with a positioning hole 430, and the assembly groove 320 is provided with a positioning post 330 for extending into the positioning hole 430. That is, when the battery is assembled, the positioning hole 430 can be used to cooperate with the positioning post 330 to position and assemble the current collecting tray 400 in the assembly groove 320, so as to position and assemble the current collecting tray 400. It can also prevent the current collecting tray 400 from shaking randomly during welding, ensuring that the position of the current collecting tray 400 is fixed. On the basis of the above, the number of the positioning holes 430 is at least two, and the corresponding number of the positioning posts 330 is also at least two. At least two positioning posts 330 can better prevent the current collecting tray 400 from shaking randomly and better play the role of fixing the current collecting tray 400. It can be understood that the positioning hole 430 can be a through hole of a circular hole, a square hole, or other shape, and the corresponding positioning post 330 is a positioning post whose shape is adapted to the shape of the positioning hole 430.

[0040] Reference Figures 1 to 5In some embodiments of the present invention, the top cover 300 includes a cover plate 340 and an insulating member 350. The insulating member 350 is connected to the cover plate 340 and is located on the side of the cover plate 340 facing the winding core 200. The assembly groove 320 is located on the side of the insulating member 350 facing the winding core 200. The cover plate 340 cooperates with the insulating member 350 to press the current collecting plate 400 toward the winding core 200. The cover plate 340 is provided with a first through hole 341, and the insulating member 350 is provided with a second through hole 351 communicating with the first through hole 341. The first through hole 341 and the second through hole 351 cooperate to form the welding through hole 310. The insulating member 350 is provided between the cover plate 340 and the current collecting plate 400 to effectively prevent electrical conduction between the current collecting plate 400 and other parts of the cover plate 340, thereby preventing leakage. Furthermore, the insulating member 350 may be made of rubber. The insulating member 350 made of rubber has a certain elasticity and can effectively seal the opening 110 of the housing 100 .

[0041] Reference Figures 1 to 5 In some embodiments of the present invention, the sealing member 500 includes a sealing plug 510 ; the sealing plug 510 is located in the second through hole 351 and seals the second through hole 351 . That is, the sealing plug 510 is used to seal the second through hole 351 to prevent the current collecting plate 400 from being exposed.

[0042] Reference Figures 1 to 5 In some embodiments of the present invention, the sealing member 500 further includes a sealing plate 520 ; the sealing plate 520 is connected to the sealing plug 510 , and the sealing plate 520 seals the first through hole 341 . That is, the sealing plate 520 and the sealing plug 510 fill the entire welding through hole 310 to ensure sealing performance.

[0043] Reference Figures 1 to 5 In some embodiments of the present invention, the sealing plate 520 is an aluminum plate and is welded to the cover plate 340. This prevents the sealing member 500 from falling out of the welding through-hole 310 after the cylindrical battery is assembled, thereby ensuring the airtightness of the cylindrical battery. It should be noted that a recessed platform is provided at the edge of the first through-hole 341 to facilitate sealing of the sealing plate 520 of the sealing member 500 against the first through-hole 341 and to facilitate welding of the sealing plate 520 to the cover plate 340.

[0044] Reference Figures 1 to 5In some embodiments of the present invention, the cross-sectional area of ​​the first through hole 341 is larger than the cross-sectional area of ​​the second through hole 351, so that the sealing plug 510 can better pass through the first through hole 341 and enter the second through hole 351, avoiding the sealing plug 510 from being stuck in the first through hole 341 so as to fill the welding through hole 310.

[0045] Reference Figures 1 to 5 In some embodiments of the present invention, the number of the welding through holes 310 is two, and the welding through holes 310 are strip holes. The strip holes allow the welding equipment to weld the collecting plate 400 along the length direction of the strip holes. Moreover, there are two strip holes, so that both sides of the collecting plate 400 can be welded to the winding core 200, ensuring welding performance.

[0046] This embodiment further provides a secondary battery, which can provide electrical energy to electrical equipment. The secondary battery includes the cylindrical battery structure as described above.

[0047] The secondary battery uses the cylindrical battery structure as described above. When assembling the secondary battery, the core 200 can be placed in the shell 100 first, and then the assembly groove 320 of the top cover 300 can be used to accommodate the collecting plate 400, and the opening 110 of the shell 100 can be sealed to complete the preliminary assembly. Then, the welding equipment can be used to pass through the welding through-hole 310, and the welding equipment can be brought into contact with the collecting plate 400 in the assembly groove 320, so that the collecting plate 400 and the core 200 are welded. Finally, the sealing member 500 is used to seal the welding through-hole 310 to prevent the collecting plate 400 from being exposed, thereby completing the assembly of the secondary battery.

[0048] Therefore, the welding assembly of the collecting plate 400 and the winding core 200 can be completed after the top cover 300 is sealed; and when the collecting plate 400 and the winding core 200 are welded, the top cover 300 has been used to fix the collecting plate 400, and there is no need to use an additional clamp to fix the collecting plate 400, thereby making the welding process of the collecting plate 400 and the winding core 200 simpler, the operation more convenient, and improving the efficiency of secondary battery assembly.

[0049] Moreover, the current collecting disk 400 of the cylindrical battery structure is in a flat shape, which reduces the height space occupied by the welding concave and convex parts and the folding structure, and the top cover 300 adopts an assembly groove 320 to accommodate the current collecting disk 400, and the top cover 300 presses the current collecting disk 400 toward the core 200, so that the core 200 and the current collecting disk 400 fit tightly, which can effectively reduce the gap between the current collecting disk 400 and the core 200 and the top cover 300, so as to effectively utilize the space in the battery and improve the space utilization rate in the battery; and, before welding the current collecting disk 400 and the core 200, the top cover 300 is used to fix the position of the current collecting disk 400 and the core 200, so when welding the current collecting disk 400 and the core 200, there is no need to use an additional clamp to fix the current collecting disk 400, thereby making the welding process of the current collecting disk 400 and the core 200 simpler and the operation more convenient, thereby improving the efficiency of cylindrical battery assembly.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A cylindrical battery structure, characterized in that: include: A housing having an opening; an interior of the housing having a mounting cavity communicating with the opening; a winding core, which is arranged in the installation cavity; a top cover connected to the housing and closing the opening; the top cover is provided with a welding through hole; a collecting tray located between the top cover and the winding core; seals; In which, the side of the top cover facing the collecting plate is provided with an assembly groove whose shape is adapted to the collecting plate; the top cover is used to press the collecting plate toward the winding core; the welding through hole of the top cover passes through the assembly groove; the collecting plate is flat, and the side of the collecting plate facing the winding core is provided with a first fitting surface for fitting with the winding core; the side of the collecting plate facing the top cover is provided with a second fitting surface for fitting with the assembly groove; the sealing member is provided at the welding through hole and is used to seal the welding through hole.

2. The cylindrical battery structure according to claim 1, characterized in that: The collecting plate is provided with a positioning hole, and the assembly groove is provided with a positioning column for extending into the positioning hole.

3. The cylindrical battery structure according to claim 1, characterized in that: The top cover includes a cover plate and an insulating member; the insulating member is connected to the cover plate, the insulating member is located on the side of the cover plate facing the winding core, the assembly groove is provided on the side of the insulating member facing the winding core, and the cover plate cooperates with the insulating member to press the collecting plate toward the winding core; the cover plate is provided with a first through hole, and the insulating member is provided with a second through hole connected to the first through hole, and the first through hole and the second through hole cooperate to form the welding through hole.

4. The cylindrical battery structure according to claim 3, characterized in that: The sealing component includes a sealing rubber plug; the sealing rubber plug is located in the second through hole, and the sealing rubber plug seals the second through hole.

5. The cylindrical battery structure according to claim 4, characterized in that: The sealing member further includes a sealing plate; the sealing plate is connected to the sealing rubber plug, and the sealing plate seals the first through hole.

6. The cylindrical battery structure according to claim 5, characterized in that: The sealing plate is an aluminum plate, and the sealing plate is welded to the cover plate.

7. The cylindrical battery structure according to claim 5, characterized in that: A cross-sectional area of ​​the first through hole is greater than a cross-sectional area of ​​the second through hole.

8. The cylindrical battery structure according to claim 2, characterized in that: The number of the positioning holes is at least two, and the number of the corresponding positioning posts is also at least two.

9. The cylindrical battery structure according to claim 1, characterized in that: The number of the welding through holes is two, and the welding through holes are strip-shaped holes.

10. A secondary battery, characterized in that: The cylindrical battery structure comprises the cylindrical battery structure according to any one of claims 1 to 9.

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