Cylindrical battery cover, cylindrical battery and assembly method

Abstract

The present invention discloses a cylindrical battery cover, a cylindrical battery, and an assembly method. The cylindrical battery cover includes a pole, a base plate, an upper current collecting plate, and a rivet. The pole, the base plate, and the upper current collecting plate are connected together by rivets, and the rivets electrically connect the pole and the upper current collecting plate. The upper current collecting plate is located at the bottom of the base plate, and the rivet is located at a position offset from the center of the base plate. By arranging the rivet at a position offset from the center of the base plate, the upper current collecting plate can be rotated around the rivet axis, and the welding area between the upper current collecting plate and the battery cell tab can be rotated out from the bottom of the base plate for welding. After the welding is completed, it can be rotated back to the bottom of the base plate, thereby eliminating the connection structure for folding on the existing upper current collecting plate structure, achieving structural simplification, reducing costs, saving internal space of the battery, and no folding process is required when assembling the upper current collecting plate, thereby improving production efficiency; and there is no need to consider the influence of thickness during design and manufacturing.

Description

Technical Field

[0001] The present invention relates to the technical field of battery end covers, and in particular to a cylindrical battery cover plate, a cylindrical battery and an assembly method. Background Art

[0002] As new energy battery technology continues to improve, the requirements for lithium-ion batteries are becoming increasingly stringent. High energy density and high safety have become the main goals of lithium-ion battery development. Currently, lithium-ion batteries can be roughly divided into three categories: soft-pack batteries, prismatic batteries, and cylindrical batteries. Currently, large cylindrical batteries with full tabs have become a key development direction for lithium-ion batteries.

[0003] The existing structure of a large cylindrical battery with full tabs is as follows: a hole is drilled in the center of the cover plate, and the upper pole of the cover plate is connected to the upper current collector plate below the cover plate with rivets. Insulators are added between the cover plate and the pole, and between the cover plate and the upper current collector plate to ensure insulation between the pole and the cover plate, and between the upper current collector plate and the cover plate. During assembly, the positive and negative upper current collector plates are welded to the flattened end faces of the winding core to ensure electrical continuity between the positive and negative poles of the battery and the winding core. After welding, the upper current collector plate is compressed and bent in a "Z" shape to align the center of the cylindrical battery cover plate with the center of the winding core, completing the assembly process of the cover plate and the winding core.

[0004] For example, the specifications of Chinese utility model patents CN212934806U and CN216311911U disclose this common cover structure for cylindrical batteries with full lugs. The battery pole is located at the center of the cover. After the upper collector plate is welded, it is bent twice to align the welded surface of the upper collector plate with the cover plate, and the winding core is aligned with the center of the cover plate to achieve assembly and fixation. After assembly, the compression between the positive and negative upper collector plates and the plastic structural components prevents the winding core from shaking up and down, or the cylindrical shell is designed with grooves to prevent the battery cell from shaking up and down.

[0005] The current full-tab cylindrical battery cover structure has the following disadvantages:

[0006] 1. During assembly, the current collecting plate on each cylindrical battery cover must be bent twice into a "Z" shape. From the perspective of battery manufacturing technology, the two bending processes require more control points. If there is a deviation in any of the bending dimensions, the upper current collecting plate and the cover will be misaligned, affecting the accuracy of the cylindrical battery cover entering the shell and reducing production efficiency.

[0007] 2. With the design increase of energy density, capacity and rate of cylindrical batteries, in order to meet the current flow capacity of the cylindrical battery cover, the thickness of the upper collector plate needs to be continuously increased. Correspondingly, the difficulty of bending the upper collector plate will also be greatly increased, and the actual manufacturing and processing will be difficult. The upper collector plate material aluminum or copper has insufficient deformation resistance and it is difficult to meet the bending requirements of the upper collector plate of large-capacity and high-rate batteries.

[0008] 3. The current bending process for the upper collector plate, after the battery cell is assembled into the battery case, creates a certain amount of squeezing pressure on the core through the plastic structural member and the upper collector plate to prevent the core from wobbling inside the battery. This causes the two bends of the upper collector plate to be continuously stressed inside the battery cell, concentrating stress at the bends. Over time, this can cause microcracks within the material, posing a safety hazard of fracture at the bends. Furthermore, the thickness of the plastic structural member of the positive and negative electrode covers, as well as the thickness of the bent upper collector plate, reduces the space utilization along the core's height, effectively reducing the core's height dimensions and lowering the battery's energy density.

[0009] 4. The current process of grooved casings to prevent the core from shaking requires at least 2-3 mm of space, reducing the cell's space utilization and energy density. The core is secured with grooves, which reduces reliability as the cell diameter increases. Vibration can cause the core to pull out in the middle of the roll, hindering the design of large cylindrical structures. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a cylindrical battery cover, a cylindrical battery and an assembly method, offset the rivet riveting position from the center of the substrate, optimize the structure and connection method of the upper collecting plate, so that the upper collecting plate does not need to be folded during assembly, thereby improving production efficiency and space utilization, and reliably positioning the battery cells.

[0011] In order to solve the above technical problems, the present invention provides a cylindrical battery cover plate, comprising a pole, a substrate, an upper current collecting plate and a rivet, wherein the pole, the substrate and the upper current collecting plate are connected together by the rivet, and the rivet electrically connects the pole and the upper current collecting plate, and the upper current collecting plate can rotate around the rivet axis relative to the substrate, and the rivet is arranged at a position deviating from the center of the substrate, so that the upper current collecting plate is rotated around the rivet axis, so that the welding area between the upper current collecting plate and the battery cell tab can be rotated out from the bottom of the substrate, and then rotated back to the bottom of the substrate after welding is completed.

[0012] In the aforementioned cylindrical battery cover, by positioning the rivets offset from the center of the base plate, the upper current collector plate can be rotated about the rivet axis, allowing the welding area between the upper current collector plate and the battery cell tab to be rotated outward from the bottom of the base plate for welding. After welding is completed, the upper current collector plate can be rotated back to the bottom of the base plate. This eliminates the need for folding connection structures in the existing upper current collector plate structure, simplifying the structure, reducing costs, and conserving internal battery space. Furthermore, the upper current collector plate assembly does not require a folding process, improving production efficiency. The thickness effect does not need to be considered during design and manufacturing. Furthermore, before and after rotation, the upper current collector plate exhibits minimal thickness fluctuation, providing reliable axial extrusion control for the battery cell. This eliminates the need for plastic retaining structures and rolling grooves, thereby improving space utilization.

[0013] As an improvement to the cylindrical battery cover of the present invention, a lower insulating plate is provided between the base plate and the upper current collecting plate. The lower insulating plate is provided with a fourth through-hole for the rivet stud to pass through. The lower insulating plate insulates the base plate from the upper current collecting plate to prevent short circuits. Preferably, the lower insulating plate can also be designed with a positioning structure to position the winding core.

[0014] Furthermore, a rotational assist member is provided between the lower insulating plate and the upper current collecting plate, and is used to reduce rotational friction between the upper current collecting plate and the lower insulating plate. Preferably, the rivet cap is provided at the bottom of the upper current collecting plate. The top of the rivet can be connected to the pole, base plate, and upper current collecting plate using a movable press riveting method; alternatively, the rivet can be connected by welding to the pole. Before welding, a certain amount of pressure is applied to the pole to compress the base plate and upper current collecting plate.

[0015] Since the rotation of the upper collector plate needs to overcome the static friction caused by the axial force after the rivet is connected by active press riveting or other means, the rotation of the upper collector plate is reduced by the rotation auxiliary part, making the rotation operation easy and having little effect on the axial connection force, so that the rivet maintains good contact with the upper collector plate and the pole, that is, maintains a good conduction state.

[0016] Furthermore, the rotation auxiliary member is sleeved on the rivet column. Preferably, the rotation auxiliary member adopts a plane bearing.

[0017] As another improvement of the cylindrical battery cover of the present invention, the upper current collecting plate includes a rectangular plate-shaped body and a lug arranged on one side of the plate-shaped body. The plate-shaped body is used for welding to the battery cell tab, and the lug is provided with a seventh through hole for the rivet column to pass through.

[0018] By removing the foldable connection portion of the existing upper collector plate structure, retaining only the portion welded to the cell tabs and the portion connected to the rivets, the upper collector plate structure and connection method are optimized. The upper collector plate is smaller than the base plate, and when viewed from the top, it completely covers the base plate's bottom, significantly reducing manufacturing costs and simplifying the structure. The plate-like body can be rotated around the rivet axis, swinging out of the base plate's bottom, leaving ample space for welding operations.

[0019] Preferably, the center of the plate-shaped body can be vertically aligned with the center of the base plate.

[0020] In order to solve the above technical problems, the present invention provides a cylindrical battery, comprising the cylindrical battery cover plate as described above, and also comprising a shell, a lower current collecting plate and a winding core, the port of the shell being sealed and welded to the edge of the substrate, the upper current collecting plate being welded to the positive electrode tab of the winding core, the lower current collecting plate being welded to the negative electrode tab of the winding core, and being welded and fixed to the bottom plate of the shell.

[0021] In the aforementioned cylindrical battery, by positioning the rivets on the battery cover at a position offset from the center of the base plate, the upper current collector plate can be rotated about the rivet axis, allowing the welding area between the upper current collector plate and the cell tab to be rotated outward from the bottom of the base plate for welding. After welding is completed, the upper current collector plate can be rotated back to the bottom of the base plate. This design transforms the existing folding current collector plate into a rotating one, thereby eliminating the folding connection structure in the existing upper current collector plate structure. This simplifies the structure, reduces costs, and saves internal battery space. Furthermore, the upper current collector plate assembly does not require a folding process, improving production efficiency. The thickness effect does not need to be considered during design and manufacturing. Furthermore, before and after rotation, the upper current collector plate exhibits minimal fluctuation in thickness, providing reliable axial extrusion control for the cell. This eliminates the need for plastic limiting structures and rolling grooves, thereby improving space utilization.

[0022] In order to solve the above technical problems, the present invention provides an assembly method based on the above cylindrical battery, comprising the following steps:

[0023] Step 1: Connect the pole, base plate and upper collecting plate with rivets;

[0024] Step 2: Rotate the upper current collecting plate so that the welding area between the upper current collecting plate and the battery cell tab is rotated to one side of the substrate;

[0025] Step 3: Weld the flattened end surface of the core positive electrode to the upper current collecting plate;

[0026] Step 4: Rotate the upper collecting plate back to the bottom of the base plate and align the winding core with the axis of the base plate.

[0027] Furthermore, it also includes:

[0028] Step 5: Weld the lower current collecting plate onto the flattened end surface of the negative electrode of the core;

[0029] Step 6: Place the core into the shell;

[0030] Step 7: Sealing and welding the edge of the substrate to the port of the shell;

[0031] Step 8: Weld the lower collecting plate to the bottom plate of the shell through the liquid injection hole and the winding needle hole of the winding core.

[0032] In the above assembly method, after the battery cover is riveted, the welding area between the upper collecting plate and the battery cell tab is rotated out from the bottom of the substrate for welding. After welding is completed, it is rotated back to the bottom of the substrate, thereby eliminating the need for folding operation and greatly improving production efficiency.

[0033] In summary, the use of the cylindrical battery cover, cylindrical battery and assembly method, through the optimization of the upper current collecting plate structure and connection method, not only simplifies the structure of the upper current collecting plate, so that there is no need to consider bending deformation during design and manufacturing, thereby reducing manufacturing costs, but also provides reliable axial limitation of the battery cell, which is beneficial to the optimization of the battery space. In addition, it can also simplify the battery production and assembly process and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In the attached figure:

[0035] Figure 1 Schematic cross-sectional view of the cylindrical battery cover of the present invention.

[0036] Figure 2 This is a disassembled structural diagram of the cylindrical battery cover of the present invention.

[0037] Figure 3 This is a bottom view of the cylindrical battery cover of the present invention.

[0038] Figure 4 This is a top view of the cylindrical battery cover of the present invention.

[0039] Figure 5 This is a structural diagram of the rotation auxiliary component of the cylindrical battery cover of the present invention.

[0040] Figure 6 This is a structural diagram of the lower insulating pad of the cylindrical battery cover of the present invention.

[0041] Figure 7 This is a structural diagram of the upper current collecting plate of the cylindrical battery cover of the present invention.

[0042] Figure 8 This is a disassembled structural diagram of the cylindrical battery of the present invention.

[0043] Figure 9 This is a structural diagram of the lower current collecting plate of the cylindrical battery of the present invention.

[0044] Figure 10 This is a schematic diagram of the bottom of the base plate after the upper current collecting plate of the cylindrical battery cover of the present invention is rotated out.

[0045] In the figure, 1. pole; 11. first through hole; 2. upper insulating gasket; 21. second through hole; 3. substrate; 31. third through hole; 32. injection hole; 4. sealing member; 5. lower insulating gasket; 51. fourth through hole; 52. fifth through hole; 53. pad; 54. rotation limit block; 6. upper collecting plate; 61. sixth through hole; 62. plate-like body; 63. lug; 64. seventh through hole; 7. rivet; 8. rotation auxiliary member; 81. rolling groove; 82. ball; 91. shell; 92. lower collecting plate; 921. blade portion; 922. fixing portion; 93. winding core. DETAILED DESCRIPTION

[0046] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0047] Figure 1-5 FIG. 1 shows a cylindrical battery cover of the present invention. Figure 1-4 As shown, the cylindrical battery cover includes a pole 1, a base plate 3, an upper current collecting plate 6 and a rivet 7. The pole 1, the base plate 3 and the upper current collecting plate 6 are connected together by the rivet 7, and the rivet 7 electrically connects the pole 1 and the upper current collecting plate 6. The upper current collecting plate 6 can rotate around the axis of the rivet 7 relative to the base plate 3. The rivet 7 is arranged at a position deviating from the center of the base plate 3.

[0048] Optionally, the cap of the rivet 7 is provided at the bottom of the upper collecting plate 6. The top of the rivet 7 can be connected to the pole 1, the base plate 3, and the upper collecting plate 6 by active riveting; or it can be connected by welding to the pole 1. Before welding, a certain pressure can be applied to the pole 1 to press the base plate 3 and the upper collecting plate 6.

[0049] During use, the upper collector plate 6 is positioned entirely at the bottom of the base plate 3. By rotating the upper collector plate 6 about the axis of the rivet 7, the welding area between the upper collector plate 6 and the cell tab can be moved outward from the bottom of the base plate 3 for welding. Once welding is complete, the upper collector plate 6 can be rotated back to the bottom of the base plate 3. This eliminates the need for a bending process during assembly, reducing the number of bending steps required for each cover plate from two to zero. This eliminates the dimensional deviations caused by the bending process, improves the accuracy of cell insertion, and enhances production efficiency. It also avoids defective products resulting from the bending process, reducing production costs. Furthermore, eliminating the need to bend the upper collector plate 6 prevents the risk of fracture caused by prolonged stress on the bent area, thereby improving battery safety.

[0050] like Figure 1 and Figure 2 As shown, an upper insulating gasket 2 is provided between the pole 1 and the base plate 3 , the pole 1 is provided with a first through hole 11 for the rivet 7 to pass through, and the upper insulating gasket 2 is provided with a second through hole 21 for the rivet 7 to pass through.

[0051] Optionally, the top of the first through hole 11 is provided with a countersunk groove adapted to the head of the rivet 7 for embedding the head of the rivet 7. The top surface of the upper insulating gasket 2 is provided with a groove adapted to the pole 1 for embedding the pole 1 and insulating the pole 1 from the base plate 3. The pole 1 and the upper insulating gasket 2 are square.

[0052] like Figure 1 and Figure 2As shown, the base plate 3 has a third through hole 31 for the rivet 7 to pass through. A seal 4 is provided on the third through hole 31 to seal between the third through hole 31 and the rivet 7. The seal 4 can be an O-ring and is provided at the bottom end of the third through hole 31.

[0053] like Figure 1 and Figure 2 As shown, a lower insulating plate 5 is provided between the base plate 3 and the upper current collecting plate 6 to insulate the two. Both the lower insulating plate 5 and the base plate 3 are disc-shaped. The lower insulating plate 5 is provided with a fourth through hole 51 for the rivet 7 to pass through.

[0054] Optionally, a rotation auxiliary component 8 is provided between the lower insulating plate 5 and the upper current collecting plate 6 , and the rotation auxiliary component 8 is used to reduce the rotational friction between the upper current collecting plate 6 and the lower insulating plate 5 .

[0055] After the rivet 7 connects the base plate 3 and the upper collecting plate 6, the rotation of the upper collecting plate 6 needs to overcome the static friction caused by the axial force such as the riveting force. This static friction is too large to facilitate the rotation operation. The rotational friction of the upper collecting plate 6 is reduced by the rotation auxiliary part 8, making the rotation operation easy and having little effect on the axial connection force, so that the rivet 7 maintains good contact with the upper collecting plate 6 and the pole 1, that is, maintains a good conduction state.

[0056] In addition, the rotation auxiliary member 8 can be a plane bearing sleeved on the rivet 7 nail column, which has a simple structure, flexible rotation, and can withstand a large axial force in the axial direction, such as pressure riveting force. Figure 5 The flat roller structure shown has an annular base with a rolling groove 81 provided on the end surface of the base. Balls 82 are embedded in the rolling groove 81 . The balls 82 protrude from the surface of the rolling groove 81 and are in rolling contact with the surface of the upper collecting plate 6 .

[0057] Optional, such as Figure 6 As shown, a pad 53 and a rotation limit block 54 are also provided on the bottom surface of the lower insulating pad 5. The pad 53 has the same height as the rotation auxiliary part 8 and is used to provide support force when the axial extrusion core 93 is limited. The rotation limit block 54 is used to limit the rotation of the upper collecting plate 6 to ensure that it can return to the original design position after welding and align with the center of the substrate 3.

[0058] Optional, such as Figure 1 and 2As shown, the base plate 3 has an injection hole 32 at its center, the lower insulating pad 5 has a fifth through-hole 52, and the upper collector plate 6 has a sixth through-hole 61. The injection hole 32, fifth through-hole 52, and sixth through-hole 61 are vertically aligned, which makes injection smoother. During injection, the electrolyte is injected directly from the center of the winding core 93 and diffuses inward. Compared to injecting from an off-center position on a conventional cover plate, the electrolyte penetration pressure is more uniform, and the electrolyte penetration rate is faster, which helps reduce injection time and improve injection production efficiency. Furthermore, when welding the lower collector plate 92 to the bottom of the housing 91, the welding head can be inserted from the injection hole 32, through the needle hole in the winding core 93, to the welding area of ​​the lower collector plate 92, and then fixed using ultrasonic welding or resistance welding. An explosion-proof valve 33 is also provided on the base plate 3.

[0059] like Figure 7 As shown, the upper collecting plate 6 includes a rectangular plate-shaped body 62 and a lug 63 provided on one side of the plate-shaped body 62. The plate-shaped body 62 is used for welding with the battery cell tab. The lug 63 is provided with a seventh through hole 64 for the rivet 7 to pass through.

[0060] The existing upper collecting plate 6 structure is constructed by removing the folded connection portion, leaving only the portion welded to the cell tab and the portion riveted to the rivet 7. This makes the upper collecting plate 6 smaller than the base plate 3. When viewed from the top of the base plate 3, the upper collecting plate 6 is completely covered by the bottom of the base plate 3, significantly saving manufacturing costs and simplifying the structure.

[0061] It can meet the design requirements of large-capacity and high-rate cylindrical batteries. In order to meet the battery's overcurrent capacity, the thickness of the upper current collecting plate 6 can be increased within the design range without considering the processing difficulties caused by bending. At the same time, compared with the bendable current collecting plate, the length of the rotating current collecting plate of the present invention is greatly shortened, which reduces the material cost in terms of cost. From a physical point of view, when the material, cross-sectional area, etc. of the pole ear are consistent, the shorter the pole ear length, the lower the internal resistance of the battery and the less heat generated when current passes through, which is beneficial to the safety performance of the battery.

[0062] The plate-like body 62 is rectangular, with a lug 63 protruding from one side. A seventh through-hole 64 engages with the rivet 7, allowing the plate-like body 62 to rotate. During riveting, the plate-like body 62 is positioned aligned with the center of the base plate 3, where one side of the lug 63 contacts the rotation stop 54. During welding, the plate-like body 62 is rotated outward from the bottom of the base plate 3 to provide ample space for welding. After welding, the plate-like body 62 is returned to its initial riveted position.

[0063] Optionally, a welding area is provided on the plate-shaped main body 62, and the top surface of the welding area protrudes from the plate-shaped column 62 to facilitate laser welding. The welding area is symmetrically V-shaped.

[0064] Figure 8 FIG. 1 shows a cylindrical battery of the present invention. Figure 8 As shown, the cylindrical battery includes the cylindrical battery cover plate as described above, and also includes a shell 91, a lower current collecting plate 92 and a winding core 93. The port of the shell 91 is sealed and welded to the edge of the substrate 3, the upper current collecting plate 6 is welded to the positive pole tab of the winding core 93, and the lower current collecting plate 92 is welded to the negative pole tab of the winding core 93, and is welded and fixed to the bottom plate of the shell 91.

[0065] To prevent the winding core 93 from wobbling within the housing 91, the base plate 3, lower insulating pad 5, upper current collecting plate 6, and lower current collecting plate 92 are squeezed against the bottom of the housing 91 at both ends of the battery winding core 93 to ensure a tight fit. Compared to traditional double-plate structures for positive and negative electrodes and grooved structures, this invention improves the spatial utilization of the winding core 93 within the height direction of the housing 91, increasing the energy density of the single cell. Only one peripheral weld is required between the positive electrode base plate 3 and the end of the housing 91, improving perimeter welding efficiency, reducing the defect rate during the perimeter welding process, and lowering production costs.

[0066] like Figure 9 As shown, the lower collecting plate 92 is in a four-leaf shape, including four blade portions 921 welded to the negative electrode of the winding core 93, and a central fixing portion 922 welded to the bottom plate.

[0067] The present invention provides an assembly method based on the above cylindrical battery, comprising the following steps:

[0068] Step S10: Connect the pole 1, base plate 3, and upper current collecting plate 6 with rivets 7. The rivet 7 is passed through the through holes of the pole 1, upper insulating gasket 2, base plate 3, seal 4, lower insulating gasket 5, and upper current collecting plate 6 in sequence, and riveted together to assemble the battery cover.

[0069] Step S20: Rotate the upper collecting plate 6 so that the welding area between the upper collecting plate 6 and the battery cell tab is rotated to one side of the substrate 3, as shown in FIG. Figure 10 Position shown.

[0070] Step S30: Weld the flattened positive end surface of the winding core 93 to the upper current collecting plate 6, usually by laser welding. The welding area is as follows: Figure 7 shown.

[0071] Step S40: rotating the upper collecting plate 6 back to the bottom of the base plate 3 and aligning the winding core 93 with the axis of the base plate 3 to complete the welding of the battery cover and the winding core 93.

[0072] Optionally, also include:

[0073] Step S50 : welding the lower current collecting plate 92 to the flattened negative electrode end surface of the winding core 93 .

[0074] Step S60: placing the winding core 93 into the housing 91. After the upper collecting plate 6 and the lower collecting plate 92 are welded, the winding core 93 is placed into the housing to ensure that the winding core 93 does not shake up and down inside the housing 91.

[0075] Step S70: sealingly welding the edge of the substrate 3 to the port of the housing 91. Then, laser welding is used to weld the edge of the substrate 3 to the edge of the housing 91.

[0076] Step S80: Weld the lower current collector plate 92 to the bottom plate of the casing 91 through the liquid injection hole 32 and the winding needle hole of the winding core 93. Extend the welding head from the battery cell liquid injection hole 32 through the center of the winding core 93 to the fixing portion 922 of the lower current collector plate 92. Use ultrasonic welding or resistance welding to weld the negative current collector plate to the bottom of the casing 91.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A cylindrical battery cover, characterized in that: The invention comprises a pole (1), a base plate (3), an upper current collecting plate (6) and a rivet (7), wherein the pole (1), the base plate (3) and the upper current collecting plate (6) are connected together by the rivet (7), and the rivet (7) electrically connects the pole (1) and the upper current collecting plate (6), and the upper current collecting plate (6) can rotate around the axis of the rivet (7), and the rivet (7) is arranged at a position deviated from the center of the base plate (3); A lower insulating pad (5) is provided between the base plate (3) and the upper current collecting plate (6), and a fourth through hole (51) for the rivet (7) to pass through is provided on the lower insulating pad (5); A rotation auxiliary component (8) is provided between the lower insulating pad (5) and the upper current collecting plate (6), and the rotation auxiliary component (8) is used to reduce the rotational friction between the upper current collecting plate (6) and the lower insulating pad (5); A pad (53) and a rotation limiting block (54) are further provided on the bottom surface of the lower insulating pad (5); the pad (53) has the same height as the rotation auxiliary component (8); and the rotation limiting block (54) is used to limit the rotation of the upper collecting plate (6); The rotation auxiliary component (8) is sleeved on the rivet (7) column, and the rotation auxiliary component (8) adopts a plane bearing.

2. A cylindrical battery cover according to claim 1, characterized in that: An upper insulating gasket (2) is provided between the pole (1) and the base plate (3); a first through hole (11) is provided on the pole (1) for the rivet (7) to pass through; and a second through hole (21) is provided on the upper insulating gasket (2) for the rivet (7) to pass through.

3. The cylindrical battery cover according to claim 1, characterized in that: The substrate (3) is provided with a third through hole (31) for the rivet (7) post to pass through, and a sealing member (4) is provided on the third through hole (31), and the sealing member (4) is used to seal between the third through hole (31) and the rivet (7) post.

4. The cylindrical battery cover according to claim 1, characterized in that: A liquid injection hole (32) is provided at the center of the base plate (3), a fifth through hole (52) is provided on the lower insulating pad (5), and a sixth through hole (61) is provided on the upper collecting plate (6); the liquid injection hole (32), the fifth through hole (52) and the sixth through hole (61) are vertically aligned.

5. The cylindrical battery cover according to claim 1, characterized in that: The upper collecting plate (6) comprises a rectangular plate-shaped body (62) and a lug (63) provided on one side of the plate-shaped body (62); the plate-shaped body (62) is used for welding to the battery cell tab; the lug (63) is provided with a seventh through hole (64) for the rivet (7) to pass through.

6. A cylindrical battery, characterized in that: The invention comprises a cylindrical battery cover as described in any one of claims 1 to 5, and further comprises a shell (91), a lower current collecting plate (92) and a winding core (93), wherein the port of the shell (91) is sealed and welded to the edge of the substrate (3), the upper current collecting plate (6) is welded to the positive electrode tab of the winding core (93), the lower current collecting plate (92) is welded to the negative electrode tab of the winding core (93), and is welded and fixed to the bottom plate of the shell (91).

7. A method for assembling a cylindrical battery according to claim 6, characterized in that: The steps include: Step 1: Connect the pole (1), the base plate (3) and the upper collecting plate (6) via rivets (7); Step 2: rotating the upper current collecting plate (6) so that the welding area of ​​the upper current collecting plate (6) and the battery cell tab is rotated to one side of the substrate (3); Step 3: Welding the flattened end surface of the positive electrode of the winding core (93) to the upper current collecting plate (6); Step 4: Rotate the upper collecting plate (6) back to the position at the bottom of the base plate (3), and make the winding core (93) and the axis of the base plate (3) collinear.

8. An assembly method according to claim 7, characterized in that: Also includes: Step 5: Welding the lower current collecting plate (92) on the flattened negative electrode end surface of the winding core (93); Step 6: Place the winding core (93) into the housing (91); Step 7: Sealing and welding the edge of the substrate (3) to the port of the shell (91); Step eight: Weld the lower collecting plate (92) to the bottom plate of the shell (91) through the liquid injection hole (32) and the winding needle hole of the winding core (93).

Images