Cylindrical battery

Abstract

The utility model provides a cylindrical battery. The cylindrical battery comprises a shell, a roll core, a sealing part, a positive collector plate and a negative cover plate assembly, the shell is provided with a liquid injection hole and a storage cavity which are communicated with each other; the roll core is located in the containing cavity and connected with the shell. The sealing part is positioned in the liquid injection hole and is connected with the shell; the positive collector plate is positioned in the accommodating cavity, is respectively connected with the shell and the roll core, and is arranged close to the sealing part; and the negative electrode cover plate assembly covers the opening of the storage cavity and is provided with a negative electrode current collecting disc, and the negative electrode current collecting disc is connected to the roll core. The cylindrical battery is convenient to process and manufacture.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrochemical devices, and in particular to a cylindrical battery. Background Art

[0002] Cylindrical batteries are an electrochemical device that is cylindrical in shape and can convert chemical energy into electrical energy. Cylindrical batteries are widely used in new energy vehicles, laptops, digital cameras, lighting fixtures, energy storage devices, and toy products.

[0003] In the prior art, a traditional cylindrical battery includes a shell structure, a core structure and two cover plate assemblies. The shell structure is provided with a storage cavity, the core structure is located in the storage cavity, a cover plate assembly is covered in the storage cavity and is sealed and welded to one end of the shell structure, and another cover plate assembly is covered in the storage cavity and is sealed and welded to the other end of the shell structure, and both ends of the core structure are respectively welded to the two cover plate assemblies, such as the Chinese patent No. CN201410016749.5.

[0004] However, since one cover plate assembly is covered in the storage cavity and sealed and welded to one end of the shell structure, and the other cover plate assembly is covered in the storage cavity and sealed and welded to the other end of the shell structure, so that the two ends of the shell structure are respectively sealed and welded to the two cover plate assemblies, the sealing welding operation steps between the shell structure and the cover plate assembly are more, and the sealing welding operation time between the shell structure and the cover plate assembly is longer, thereby making the sealing welding operation efficiency between the shell structure and the cover plate assembly low, which is not convenient for the processing and manufacturing of cylindrical batteries, and further makes the processing and manufacturing convenience of cylindrical batteries poor. Utility Model Content

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cylindrical battery that is easier to process and manufacture.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A cylindrical battery, comprising:

[0008] The shell is provided with a liquid injection hole and a receiving cavity which are connected to each other;

[0009] A winding core, located in the storage cavity and connected to the shell;

[0010] A sealing portion, located in the injection hole and connected to the shell;

[0011] A positive electrode current collecting disk is located in the receiving cavity, the positive electrode current collecting disk is connected to the shell and the winding core respectively, and the positive electrode current collecting disk is arranged adjacent to the sealing portion;

[0012] The negative electrode cover plate assembly is covered at the opening of the storage cavity. The negative electrode cover plate assembly is provided with a negative electrode current collecting disk, and the negative electrode current collecting disk is connected to the winding core.

[0013] In one of the embodiments, the injection hole is opened at the end of the shell away from the negative electrode cover plate assembly.

[0014] In one of the embodiments, the central axis of the injection hole is coaxially arranged with the central axis of the shell.

[0015] In one embodiment, the injection hole includes a connected sealing groove and a through hole, the sealing groove is located on the outer side of the end of the shell away from the negative electrode cover plate assembly, the sealing groove is connected to the storage cavity through the through hole, and the sealing part is located in the sealing groove and connected to the shell.

[0016] In one of the embodiments, the positive electrode current collecting disk is provided with avoidance holes, and the avoidance holes are respectively connected to the injection hole and the receiving cavity.

[0017] In one embodiment, the positive electrode current collecting disc is welded to the shell and the winding core respectively.

[0018] In one embodiment, the negative electrode cover plate assembly also includes a cover plate body, an insulating part and a pole column, the cover plate body is provided with a connecting through hole, the insulating part is provided with a accommodating groove, the accommodating groove is respectively connected with the connecting through hole and the storage cavity, the pole column is sequentially passed through the connecting through hole and the accommodating groove, the pole column is respectively connected with the cover plate body and the insulating part, the cover plate body is connected with the insulating part, the negative electrode current collector is bent toward the inner side of the accommodating groove so that the negative electrode current collector is located in the storage cavity, the pole column is connected to the end of the negative electrode current collector away from the winding core; the cover plate body is covered with the storage cavity and sealed and welded with the shell, and the insulating part is located in the storage cavity.

[0019] In one embodiment, the negative electrode cover plate assembly also includes an explosion-proof valve, the cover plate body is also provided with an installation through hole, and the insulating part is also provided with an air groove, the air groove is respectively connected to the installation through hole and the storage cavity, and the explosion-proof valve is located in the installation through hole and connected to the cover plate body.

[0020] In one of the embodiments, a sealing ring is provided at the connection between the pole body and the cover plate body.

[0021] In one embodiment, the pole body is riveted to the cover body and the insulating portion respectively.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] Since the positive current collector is connected to the shell and the winding core respectively, so that the positive current collector is located between the shell and the winding core, so that one side of the positive current collector is connected to the end of the shell, the other side of the positive current collector is connected to one end of the winding core, and one side of the positive current collector is connected to the end of the shell to form the positive terminal of the cylindrical battery together, the negative cover plate assembly is covered at the opening of the storage cavity, so that the negative cover plate assembly and the shell are sealed and welded, the negative current collector is connected to the winding core, so that the negative cover plate assembly serves as the negative terminal of the cylindrical battery, so that the negative terminal of the cylindrical battery is sealed and welded with the negative cover plate assembly, and the positive terminal of the cylindrical battery replaces the traditional positive cover plate assembly by the combination of the positive current collector and the shell, so there is no need to add the positive cover plate assembly, so that the structure of the cylindrical battery is simpler;

[0024] In addition, since the positive end of the cylindrical battery does not need to be sealed and welded with the positive cover assembly, it is only necessary to perform sealing welding at the connection between one end of the shell and the negative cover assembly, thereby solving the problem in the prior art that sealing welding operations need to be performed with two cover assemblies at both ends of the shell structure respectively, so that at least one cover assembly operation step is reduced when sealing and welding between the shell and the cover assembly, so that the sealing welding operation steps between the shell and the cover assembly are reduced, so that the sealing welding operation time between the shell and the cover assembly is shorter, thereby making the sealing welding operation efficiency between the shell and the cover assembly higher, which is beneficial to improving the efficiency and convenience of the processing and manufacturing of cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of a cylindrical battery according to an embodiment;

[0027] Figure 2 for Figure 1 A schematic structural diagram of a cylindrical battery from another perspective;

[0028] Figure 3 for Figure 2 A cross-sectional view of the cylindrical battery shown along line AA;

[0029] Figure 4 for Figure 3 An enlarged schematic diagram of the cylindrical battery at point B is shown;

[0030] Figure 5 for Figure 1 A schematic structural diagram of a negative electrode cover assembly of a cylindrical battery shown;

[0031] Figure 6 for Figure 5 The three-dimensional exploded structural schematic diagram of the negative electrode cover assembly is shown. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] The present invention provides a cylindrical battery, comprising a shell, a winding core, a sealing portion, a positive electrode collector disk and a negative electrode cover plate assembly; the shell is provided with a connected injection hole and a storage cavity; the winding core is located in the storage cavity and connected to the shell; the sealing portion is located in the injection hole and connected to the shell; the positive electrode collector disk is located in the storage cavity, the positive electrode collector disk is respectively connected to the shell and the winding core, and the positive electrode collector disk is arranged adjacent to the sealing portion; the negative electrode cover plate assembly is covered at the opening of the storage cavity, the negative electrode cover plate assembly is provided with a negative electrode collector disk, and the negative electrode collector disk is connected to the winding core.

[0036] In the cylindrical battery, the positive current collector is connected to the shell and the winding core respectively, so that the positive current collector is located between the shell and the winding core, so that one side of the positive current collector is connected to the end of the shell, and the other side of the positive current collector is connected to one end of the winding core. One side of the positive current collector is connected to the end of the shell to form the positive terminal of the cylindrical battery. The negative cover plate assembly is covered at the opening of the storage cavity so that the negative cover plate assembly and the shell are sealed and welded. The negative current collector is connected to the winding core so that the negative cover plate assembly serves as the negative terminal of the cylindrical battery, so that the negative terminal of the cylindrical battery is sealed and welded with the negative cover plate assembly. The positive terminal of the cylindrical battery replaces the traditional positive cover plate assembly by using the combination of the positive current collector and the shell. In this way, there is no need to add the positive cover plate assembly, so that the structure of the cylindrical battery is simpler.

[0037] In addition, since the positive end of the cylindrical battery does not need to be sealed and welded with the positive cover assembly, it is only necessary to perform sealing welding at the connection between one end of the shell and the negative cover assembly, thereby solving the problem in the prior art that sealing welding operations need to be performed with two cover assemblies at both ends of the shell structure respectively, so that at least one cover assembly operation step is reduced when sealing and welding between the shell and the cover assembly, so that the sealing welding operation steps between the shell and the cover assembly are reduced, so that the sealing welding operation time between the shell and the cover assembly is shorter, thereby making the sealing welding operation efficiency between the shell and the cover assembly higher, which is beneficial to improving the efficiency and convenience of the processing and manufacturing of cylindrical batteries.

[0038] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0039] like Figures 1 to 6 As shown, a cylindrical battery 10 of an embodiment includes a shell 100, a winding core 200, a sealing portion 300, a positive electrode current collecting disc 400 and a negative electrode cover plate assembly 500; the shell 100 is provided with a connected injection hole 121 and a storage cavity 111; the winding core 200 is located in the storage cavity 111 and connected to the shell 100; the sealing portion 300 is located in the injection hole 121 and connected to the shell 100; the positive electrode current collecting disc 400 is located in the storage cavity 111, the positive electrode current collecting disc 400 is respectively connected to the shell 100 and the winding core 200, and the positive electrode current collecting disc 400 is arranged adjacent to the sealing portion 300; the negative electrode cover plate assembly 500 is covered at the opening of the storage cavity 111, and the negative electrode cover plate assembly 500 is provided with a negative electrode current collecting disc 510, and the negative electrode current collecting disc 510 is connected to the winding core 200.

[0040] In this embodiment, the positive current collecting disc 400 is connected to the housing 100 and the winding core 200 respectively, so that the positive current collecting disc 400 is located between the housing 100 and the winding core 200, so that one side of the positive current collecting disc 400 is connected to the end of the housing 100, the other side of the positive current collecting disc 400 is connected to one end of the winding core 200, and one side of the positive current collecting disc 400 is connected to the end of the housing 100 to form the positive end of the cylindrical battery 10. The negative electrode cover plate assembly 500 is covered at the opening of the storage cavity 111, so that the negative electrode cover plate assembly 500 and the housing 100 are sealed and welded.

[0041] In the cylindrical battery 10, since the positive electrode current collecting disk 400 is connected to the shell 100 and the winding core 200 respectively, the positive electrode current collecting disk 400 is located between the shell 100 and the winding core 200, so that one side of the positive electrode current collecting disk 400 is connected to the end of the shell 100, the other side of the positive electrode current collecting disk 400 is connected to one end of the winding core 200, and one side of the positive electrode current collecting disk 400 is connected to the end of the shell 100 to form the positive end of the cylindrical battery 10, and the negative electrode cover plate assembly 500 is covered in the storage cavity 11 1, so that the negative electrode cover plate assembly 500 is sealed and welded with the shell 100, and the negative electrode current collecting plate 510 is connected to the winding core 200, so that the negative electrode cover plate assembly 500 serves as the negative terminal of the cylindrical battery 10, so that the negative terminal of the cylindrical battery 10 is sealed and welded with the negative electrode cover plate assembly 500, and the positive terminal of the cylindrical battery 10 replaces the traditional positive electrode cover plate assembly through the combination of the positive electrode current collecting plate 400 and the shell 100, so that there is no need to add a positive electrode cover plate assembly, so that the structure of the cylindrical battery 10 is simpler;

[0042] In addition, since the positive end of the cylindrical battery 10 does not need to be sealed and welded with the positive electrode cover plate assembly, it is only necessary to perform sealing welding at the connection between one end of the shell 100 and the negative electrode cover plate assembly 500, thereby solving the problem in the prior art that sealing welding operations need to be performed with two cover plate assemblies at both ends of the shell structure, so that at least one cover plate assembly operation step is reduced when sealing and welding between the shell 100 and the cover plate assembly, so that the sealing welding operation steps between the shell 100 and the cover plate assembly are reduced, so that the sealing welding operation time between the shell 100 and the cover plate assembly is shorter, thereby making the sealing welding operation efficiency between the shell 100 and the cover plate assembly higher, which is beneficial to improving the efficiency and convenience of the processing and manufacturing of the cylindrical battery 10.

[0043] like Figures 1 to 4 As shown, in one embodiment, the injection hole 121 is opened at the end of the shell 100 away from the negative electrode cover plate assembly 500.

[0044] Furthermore, the housing 100 includes a column housing portion 110 and an end housing portion 120, the column housing portion 110 and the end housing portion 120 are connected to form a storage chamber 111, the injection hole 121 is provided in the end housing portion 120, the winding core 200 is connected to the column housing portion 110, the sealing portion 300 and the positive electrode current collecting plate 400 are both connected to the end housing portion 120, and the negative electrode cover plate assembly 500 is sealed and welded to the column housing portion 110; the column housing portion 110 and the end housing portion 120 are an integrally formed structure. In this embodiment, the column housing portion 110 and the end housing portion 120 are an integrally formed structure, so that the structural strength between the column housing portion 110 and the end housing portion 120 is high, thereby making the structural stability of the housing 100 better.

[0045] like Figures 1 to 4 As shown, in one embodiment, the central axis of the injection hole 121 is coaxially arranged with the central axis of the shell 100, that is, the central axis of the injection hole 121 is coaxially arranged with the central axis of the end shell 120, so that the injection hole 121 is arranged in the center of the end shell 120, which is beneficial to the processing of the injection hole 121, so that the processing and manufacturing of the cylindrical battery 10 is more convenient.

[0046] like Figures 1 to 4 As shown, in one embodiment, the injection hole 121 includes a connected sealing groove 1211 and a through hole 1212, the sealing groove 1211 is located outside the end of the housing 100 away from the negative electrode cover plate assembly 500, the sealing groove 1211 is connected to the storage cavity 111 through the through hole 1212, and the sealing part 300 is located in the sealing groove 1211 and connected to the housing 100. In this embodiment, the sealing part 300 is welded to the housing 100, so that the connection strength between the sealing part 300 and the housing 100 is good.

[0047] like Figures 1 to 4 As shown, in one embodiment, the positive electrode current collecting plate 400 is provided with an avoidance hole 410, and the avoidance hole 410 is respectively connected to the injection hole 121 and the receiving cavity 111, so that the electrolyte enters the receiving cavity 111 along the injection hole 121 and the avoidance hole 410, so as to facilitate the injection process of the cylindrical battery 10, so that the processing and manufacturing convenience of the cylindrical battery 10 is better.

[0048] like Figure 3 to Figure 4 As shown, in one of the embodiments, the positive electrode current collecting disc 400 is welded to the shell 100 and the winding core 200 respectively, so that the connection strength between one side of the positive electrode current collecting disc 400 and the shell 100 is relatively high, and the connection strength between the other side of the positive electrode current collecting disc 400 and the winding core 200 is relatively high, thereby making the structural stability of the cylindrical battery 10 better.

[0049] like Figure 1 , Figure 2 , Figure 5 and Figure 6As shown in one embodiment, the negative electrode cover plate assembly 500 further includes a cover plate body 520, an insulating portion 530 and a pole column 540, the cover plate body 520 is provided with a connecting through hole 521, the insulating portion 530 is provided with a receiving groove 531, the receiving groove 531 is respectively connected to the connecting through hole 521 and the receiving cavity 111, the pole column 540 is sequentially penetrated through the connecting through hole 521 and the receiving groove 531, and the pole column 540 is respectively connected to the cover plate body 520. The plate body 520 and the insulating part 530 are connected, the cover plate body 520 is connected to the insulating part 530, the negative electrode current collecting disc 510 is bent toward the inner side of the receiving slot 531, so that the negative electrode current collecting disc 510 is located in the storage cavity 111, and the pole body 540 is connected to the end of the negative electrode current collecting disc 510 away from the winding core 200; the cover plate body 520 is covered in the storage cavity 111 and sealed and welded with the shell 100, and the insulating part 530 is located in the storage cavity 111. In this embodiment, the cover plate body 520 and the insulating part 530 are bonded to facilitate the connection between the cover plate body 520 and the insulating part 530, so that the connection between the cover plate body 520 and the insulating part 530 is more convenient.

[0050] like Figures 5 and 6 As shown, in one embodiment, the negative electrode cover plate assembly 500 further includes an explosion-proof valve 550, the cover plate body 520 further has an installation hole 522, the insulating portion 530 further has an air passage groove 532, the air passage groove 532 is respectively connected to the installation hole 522 and the storage cavity 111, and the explosion-proof valve 550 is located in the installation hole 522 and connected to the cover plate body 520. In this embodiment, the explosion-proof valve 550 is used to discharge the gas in the cylindrical battery 10 to improve the safety of the cylindrical battery 10.

[0051] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in one embodiment, a sealing ring 523 is provided at the connection between the pole body 540 and the cover body 520 to ensure better sealing performance of the connection between the pole body 540 and the cover body 520.

[0052] like Figures 5 and 6 As shown, in one embodiment, the pole column 540 is riveted to the cover body 520 and the insulating portion 530 respectively, so that the connection strength between one end of the pole column 540 and the insulating portion 530 is high, and the connection strength between the other end of the pole column 540 and the cover body 520 is high, thereby making the structural stability of the cylindrical battery 10 better.

[0053] Furthermore, if Figures 1 to 6As shown, in one embodiment, the positive current collecting disc 400 and the shell 100 are penetration welded, that is, the positive current collecting disc 400 and the end shell portion 120 are penetration welded; the sealing groove 1211 includes a large groove 1211a and a small groove 1211b that are connected, and the through hole 1212 is connected to the small groove 1211b, so that the inner wall of the through hole 1212 and the small groove 1211b jointly forms a penetration welding step 1211c, and the laser performs a penetration welding operation through the penetration welding step 1211c, so that the reliability of the penetration welding operation is higher, and at the same time, the problem of the bulge in the welding area affecting the assembly of the sealing part 300 after laser penetration welding is avoided; the sealing part 300 is located in the large groove 1211a and is welded to the shell 100, and the inner wall of the large groove 1211a is welded to the sealing part 300, so that the connection strength between the sealing part 300 and the shell 100 is higher, so that the structural stability of the cylindrical battery 10 is better.

[0054] Furthermore, the large grooves 1211 a , the small grooves 1211 b , and the via holes 1212 are distributed in a stepped manner, and the diameters of the large grooves 1211 a , the small grooves 1211 b , and the via holes 1212 decrease in sequence.

[0055] In order to ensure the strength of the housing 100 and facilitate the smoothness of liquid injection, further, the inner wall of the small groove 1211b is extended to the position of the large groove 1211a to form a liquid guiding slope (not shown).

[0056] Furthermore, the liquid guiding slope is an arc-shaped slope to reduce stress generation.

[0057] Furthermore, the positive electrode current collecting disc 400 is provided with a welding position 420 , which is welded to the shell 100 , and the contour of the small groove 1211 b is arranged around the orthographic projection of the welding position 420 on the shell 100 .

[0058] Furthermore, the cylindrical battery 10 has a cover assembly sealed and welded only at one end, so that the cylindrical battery 10 has a single-head negative cover structure, and no positive cover structure invades the interior of the shell 100, so that the pole piece width of the cylindrical battery 10 of the same size is designed to be wider, so as to improve the energy density of the cylindrical battery 10 and at the same time make the production cost of the cylindrical battery 10 lower.

[0059] Furthermore, the positive electrode current collecting disc 400 and the shell 100 are penetrated and welded, so that the welding difficulty between the positive electrode current collecting disc 400 and the shell 100 is relatively small, so that the current carrying capacity of the positive electrode current collecting disc 400 is improved. In this embodiment, the shell 100 and the positive electrode current collecting disc 400 are both aluminum-based structures, and the safe current carrying value of aluminum is 3 to 5A / mm 2 , conductivity 369000S / cm; the dimensions of the positive electrode current collector 400 are: width 14mm, thickness 0.3mm, current carrying area 4.2mm 2The positive electrode current collector 400 is penetrated and welded with the shell 100, with a welding width of 1mm to 2mm, a welding diameter of 10mm, a thickness of 0.3mm, and a current carrying area of ​​about 9.42mm. 2 .

[0060] Furthermore, one side of the positive electrode current collecting plate 400 is connected to the end of the shell 100 to form the positive terminal of the cylindrical battery 10. That is, the positive terminal of the cylindrical battery 10 replaces the traditional positive electrode cover plate assembly by combining the positive electrode current collecting plate 400 and the shell 100. The shell 100 and the negative electrode cover plate assembly 500 are sealed and welded so that the cylindrical battery 10 can achieve external current diversion on the same side.

[0061] Furthermore, the pole body 540 is riveted to the cover plate body 520 and the insulating portion 530 respectively, thereby avoiding the problem of welding penetration and fluid leakage caused by pole welding.

[0062] Furthermore, the injection hole 121 is arranged at the center of the shell 100 to facilitate the positioning of the injection hole 121, so that the cylindrical battery 10 does not need to be rotated during the primary injection, secondary injection and negative pressure formation process, thereby avoiding scratching the outer surface of the cylindrical battery 10.

[0063] Furthermore, the sealing part 300 is in a sheet shape, so that the processing of the sealing part 300 is simple, and the production cost of the sealing part 300 is low.

[0064] Furthermore, the diameter of the cylindrical battery 10 is 32 to 80 mm; the height of the cylindrical battery 10 is 70 mm to 300 mm. Since the positive electrode cover plate assembly is omitted, the winding core 200 is directly connected to the shell 100 through the positive electrode collecting plate 400, which not only simplifies the processing procedure of the cylindrical battery 10, but also under the condition of the same height of the cylindrical battery 10, the energy density of the cylindrical battery 10 is higher.

[0065] Compared with the prior art, the present invention has at least the following advantages:

[0066] Since the positive electrode current collecting disk 400 is connected to the shell 100 and the winding core 200 respectively, so that the positive electrode current collecting disk 400 is located between the shell 100 and the winding core 200, one side of the positive electrode current collecting disk 400 is connected to the end of the shell 100, and the other side of the positive electrode current collecting disk 400 is connected to one end of the winding core 200. One side of the positive electrode current collecting disk 400 is connected to the end of the shell 100 to form the positive terminal of the cylindrical battery 10. The negative electrode cover plate assembly 500 is covered at the opening of the storage cavity 111. , so that the negative electrode cover plate assembly 500 is sealed and welded with the shell 100, the negative electrode collector plate 510 is connected to the winding core 200, so that the negative electrode cover plate assembly 500 serves as the negative terminal of the cylindrical battery 10, so that the negative terminal of the cylindrical battery 10 is sealed and welded with the negative electrode cover plate assembly 500, and the positive terminal of the cylindrical battery 10 replaces the traditional positive electrode cover plate assembly through the combination of the positive electrode collector plate 400 and the shell 100, so that there is no need to add a positive electrode cover plate assembly, so that the structure of the cylindrical battery 10 is simpler;

[0067] In addition, since the positive end of the cylindrical battery 10 does not need to be sealed and welded with the positive electrode cover plate assembly, it is only necessary to perform sealing welding at the connection between one end of the shell 100 and the negative electrode cover plate assembly 500, thereby solving the problem in the prior art that sealing welding operations need to be performed with two cover plate assemblies at both ends of the shell structure, so that at least one cover plate assembly operation step is reduced when sealing and welding between the shell 100 and the cover plate assembly, so that the sealing welding operation steps between the shell 100 and the cover plate assembly are reduced, so that the sealing welding operation time between the shell 100 and the cover plate assembly is shorter, thereby making the sealing welding operation efficiency between the shell 100 and the cover plate assembly higher, which is beneficial to improving the efficiency and convenience of the processing and manufacturing of the cylindrical battery 10.

[0068] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A cylindrical battery, characterized in that: include: The shell is provided with a liquid injection hole and a receiving cavity which are connected to each other; A winding core, located in the storage cavity and connected to the shell; A sealing portion, located in the injection hole and connected to the shell; A positive electrode current collecting disk is located in the receiving cavity, the positive electrode current collecting disk is connected to the shell and the winding core respectively, and the positive electrode current collecting disk is arranged adjacent to the sealing portion; The negative electrode cover plate assembly is covered at the opening of the storage cavity. The negative electrode cover plate assembly is provided with a negative electrode current collecting disk, and the negative electrode current collecting disk is connected to the winding core.

2. The cylindrical battery according to claim 1, characterized in that: The liquid injection hole is opened at the end of the shell away from the negative electrode cover plate assembly.

3. The cylindrical battery according to claim 2, characterized in that: The central axis of the liquid injection hole is coaxially arranged with the central axis of the shell.

4. The cylindrical battery according to claim 2, characterized in that: The injection hole includes a connected sealing groove and a through hole. The sealing groove is located on the outer side of the end of the shell away from the negative electrode cover plate assembly. The sealing groove is connected to the storage cavity through the through hole. The sealing part is located in the sealing groove and connected to the shell.

5. The cylindrical battery according to claim 1, characterized in that: The positive electrode current collecting disk is provided with avoidance holes, and the avoidance holes are respectively communicated with the injection hole and the receiving cavity.

6. The cylindrical battery according to claim 1, characterized in that: The positive electrode current collecting disk is welded to the shell and the winding core respectively.

7. The cylindrical battery according to claim 1, characterized in that: The negative electrode cover assembly also includes a cover body, an insulating part and a pole column, the cover body is provided with a connecting through hole, the insulating part is provided with a accommodating groove, the accommodating groove is respectively connected with the connecting through hole and the storage cavity, the pole column is sequentially penetrated through the connecting through hole and the accommodating groove, the pole column is respectively connected with the cover body and the insulating part, the cover body is connected with the insulating part, the negative current collector is bent toward the inner side of the accommodating groove so that the negative current collector is located in the storage cavity, the pole column is connected to the end of the negative current collector away from the winding core; the cover body is covered with the storage cavity and sealed and welded with the shell, and the insulating part is located in the storage cavity.

8. The cylindrical battery according to claim 7, characterized in that: The negative electrode cover assembly also includes an explosion-proof valve, the cover body is also provided with a mounting through hole, the insulating portion is also provided with an air passage groove, the air passage groove is respectively connected to the mounting through hole and the storage cavity, the explosion-proof valve is located in the mounting through hole and connected to the cover body.

9. The cylindrical battery according to claim 7, characterized in that: A sealing ring is provided at the connection between the pole body and the cover plate body.

10. The cylindrical battery according to claim 7, characterized in that: The pole body is riveted to the cover plate body and the insulating portion respectively.

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