CN115714221A

CN115714221A - Cylindrical battery cover plate, cylindrical battery and assembly method

Info

Publication number: CN115714221A
Application number: CN202211601684.1A
Authority: CN
Inventors: 黄兴; 朱杰; 韩翰; 邓庆雄; 辛塍
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-02-24

Abstract

The invention discloses a cylindrical battery cover plate, a cylindrical battery and an assembly method. This cylinder battery apron includes utmost point post, base plate, goes up current collection dish and rivet, and utmost point post, base plate and last current collection dish pass through rivet connection and are in the same place, and rivet electric connection utmost point post and last current collection dish, go up current collection dish and lie in the bottom of base plate, and the position of skew base plate center is located to the rivet. The rivet is arranged at a position deviated from the center of the base plate, so that the upper current collecting disc is rotated around the axis of the rivet, the welding area of the upper current collecting disc and the lug of the battery core can be rotated out from the bottom of the base plate for welding, and the upper current collecting disc is rotated back to the bottom of the base plate after welding is finished, so that a connecting structure for folding is omitted on the structure of the existing upper current collecting disc, the structure is simplified, the cost is reduced, the internal space of the battery is saved, a folding process is not needed during assembly of the upper current collecting plate, and the production efficiency is improved; the influence of the thickness does not need to be considered when designing and manufacturing.

Description

Cylindrical battery cover plate, cylindrical battery and assembly method

Technical Field

The invention relates to the technical field of battery end covers, in particular to a cylindrical battery cover plate, a cylindrical battery and an assembly method.

Background

With the continuous improvement of new energy battery technology, the requirements on the lithium ion battery are higher and higher, and high energy density and high safety become the main targets of the development of the lithium ion battery. Currently, lithium ion batteries can be roughly divided into three directions: soft package battery, square battery and cylindrical battery, at present, the big cylindrical battery of full utmost point ear has become the important direction of lithium ion battery development.

The existing big cylindrical battery structure with full lugs mainly comprises: punch in the middle of the apron, will lap top utmost point post and lap the side on the current-collecting tray be connected through the rivet, lap and utmost point post and lap and go up through increasing the insulating part between the current-collecting tray, guarantee utmost point post and apron and go up the current-collecting tray and lap insulating. During assembly, the positive and negative upper current collecting discs are respectively welded with the end faces of the rolled core after being flattened, so that the conduction of the positive and negative electrode posts of the battery and the rolled core is ensured, the upper current collecting discs are welded to complete Z-shaped compression bending of the upper current collecting discs, the center of the cylindrical battery cover plate is aligned with the center of the rolled core, and the assembly process of the cover plate and the rolled core is realized.

If in chinese utility model patent CN212934806U and CN 216311911U's specification, just disclose this kind of common full utmost point ear cylinder battery cover plate structure, battery utmost point post is put at apron central point, goes up the tray welding and accomplishes the back, through twice buckling and accomplish on the tray welding face parallel with the apron, roll up the core and align with the apron center, realize the assembly fixed. And after the assembly, the stress extrusion of the current collecting disc and the plastic structural member on the positive and negative electrodes prevents the winding core from shaking up and down, or prevents the battery core from shaking up and down by carrying out rolling groove design on the cylindrical shell.

The current full-lug cylindrical battery cover plate structure has the following disadvantages:

1. during assembly, the current collecting disc on each cylindrical battery cover plate needs to be bent twice to form a Z shape, and from the aspect of the manufacturing process of the battery, the number of control points needed by the twice bending process is large, and deviation occurs to one bending size, so that dislocation between the current collecting disc and the cover plate can be caused, the shell entering accuracy of the cylindrical battery cover plate is influenced, and the production efficiency is reduced.

2. Along with the design growth of cylinder battery energy density, capacity and multiplying power, for satisfying the ability of overflowing of cylinder battery apron, the thickness of going up the current collection dish needs to last the increase, and the degree of difficulty that corresponding upward current collection dish buckled also can greatly increased, and the actual manufacturing processing is difficult, and upward current collection dish material aluminium or copper anti deformability are not enough, are difficult to satisfy the demand of buckling of current collection dish on large capacity, the big multiplying power battery.

3. At present to the technology that goes on buckling of last current collection dish, after the shell was assembled to electric core, for preventing to roll up the core and rock about battery is inside, can form certain extrusion force to rolling up the core through plastic construction spare and last current collection dish, lead to two bendings of current collection dish to be in the inside atress that lasts of electric core, the position stress concentration of buckling gets off the inside microcrack that probably produces of material for a long time, has the cracked potential safety hazard of position of bending. In addition, the thickness of the plastic structural parts of the positive and negative cover plates and the thickness of the bent upper current collecting disc can reduce the space utilization rate in the height direction of the winding core, actually reduce the size in the height direction of the winding core, and reduce the energy density of the battery.

4. At present, the technology of rolling up the core and preventing the core from shaking up and down is carried out on the shell, the rolling groove position at least needs to occupy 2-3 mm of space, and the space utilization rate and the energy density of the battery cell are reduced. Roll up the core and adopt the roll slot fixed, it is not high to increase the back reliability when electric core diameter, and electric core vibration in-process causes to loose core in the middle of rolling up the core on the direction of height, is unfavorable for big cylinder structural design.

Disclosure of Invention

The invention aims to solve the technical problem of providing a cylindrical battery cover plate, a cylindrical battery and an assembling method, wherein the riveting position of a rivet is deviated from the center of a base plate, the structure and the connection mode of an upper current collecting disc are optimized, the upper current collecting disc does not need to be folded during assembling, the production efficiency and the space utilization rate are improved, and the positioning of a battery cell is reliable.

In order to solve the technical problem, the cylindrical battery cover plate comprises a pole, a base plate, an upper current collecting disc and a rivet, wherein the pole, the base plate and the upper current collecting disc are connected together through the rivet, the rivet is electrically connected with the pole and the upper current collecting disc, the upper current collecting disc can rotate around the axis of the rivet relative to the base plate, the rivet is arranged at a position deviated from the center of the base plate, so that the upper current collecting disc can rotate around the axis of the rivet, a welding area of the upper current collecting disc and a lug of an electric core can be rotated out from the bottom of the base plate, and the upper current collecting disc and the lug of the electric core rotate back to the bottom of the base plate after welding is completed.

In the cylindrical battery cover plate, the rivet is arranged at a position deviated from the center of the base plate, so that the upper current collecting disc is rotated around the axis of the rivet, the welding area of the upper current collecting disc and the lug of the battery cell can be rotated out of the bottom of the base plate for welding, and the upper current collecting disc is rotated back to the bottom of the base plate after welding is finished, so that a connecting structure for folding is omitted on the structure of the conventional upper current collecting disc, the structure is simplified, the cost is reduced, the internal space of the battery is saved, a folding process is not needed during assembly of the upper current collecting plate, and the production efficiency is improved; the influence of the thickness does not need to be considered when designing and manufacturing. In addition, the upper flow collecting plate has small floating in the thickness direction before and after rotation, the axial extrusion limit of the battery cell is reliable, the use of structures such as plastic limit structural members and rolling grooves can be saved, and the space utilization rate is improved.

As an improvement of the cylindrical battery cover plate, a lower insulating base plate is arranged between the base plate and the upper current collecting plate, and a fourth through hole for the rivet column to pass through is formed in the lower insulating base plate. The substrate and the upper current collecting disc are insulated and separated through the lower insulating base plate, and the short circuit phenomenon is avoided. Preferably, the lower insulating base plate can also be provided with a positioning structure to position the winding core.

Furthermore, a rotating auxiliary part is arranged between the lower insulating base plate and the upper flow collecting disc and used for reducing the rotating friction force between the upper flow collecting disc and the lower insulating base plate. Preferably, the head of the rivet is arranged at the bottom of the upper header plate. The top end of the rivet can be movably connected with the pole, the substrate and the upper current collecting disc in a pressure riveting mode; the pole can be connected in a mode of welding with the pole, and a certain pressure is applied to the pole to compress the substrate and the upper current collecting disc before welding.

After the rivet is movably pressed and riveted or connected in other modes, the static friction force generated by the axial force needs to be overcome when the upper flow collecting disc rotates, the rotary friction force of the upper flow collecting disc is reduced through the rotary auxiliary piece, so that the rotary operation is easy, the influence on the axial connecting force is small, the rivet is kept in good contact with the upper flow collecting disc and the pole, and a good conduction state is kept.

Furthermore, the rotating auxiliary piece is sleeved on the rivet column. Preferably, the rotation aid is a flat bearing.

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

In the existing upper current collecting disc structure, a connecting part needing to be folded is removed, and only a part welded with a battery core tab and a part connected with a rivet are reserved, so that the upper current collecting disc structure and the connecting mode are optimized. The size of the upper flow collecting disc is smaller than that of the base plate, and the upper flow collecting disc is completely covered at the bottom of the base plate when viewed from the top of the base plate, so that the manufacturing cost is greatly saved, and the structure is simplified. The plate-like body can be rotated about the rivet axis, out of the bottom of the base plate, so that there is ample space for the welding operation.

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

In order to solve the technical problem, the cylindrical battery comprises the cylindrical battery cover plate, a shell, a lower current collecting disc and a winding core, wherein a port of the shell is hermetically welded with the edge of the base plate, the upper current collecting disc is welded with an anode tab of the winding core, and the lower current collecting disc is welded with a cathode tab of the winding core and is fixedly welded with a bottom plate of the shell.

In the cylindrical battery, the rivet of the battery cover plate is arranged at a position deviated from the center of the base plate, so that the upper current collecting disc is rotated around the axis of the rivet, the welding area of the upper current collecting disc and the lug of the battery core can be rotated out of the bottom of the base plate for welding, and the upper current collecting disc is rotated to the bottom of the base plate after the welding is finished, namely the existing folding current collecting disc is changed into a rotating type, so that a connecting structure for folding is omitted on the structure of the existing upper current collecting disc, the structure is simplified, the cost is reduced, the internal space of the battery is saved, a folding process is not needed when the upper current collecting plate is assembled, and the production efficiency is improved; the influence of the thickness does not need to be considered when designing and manufacturing. In addition, the upper flow collecting plate has small floating in the thickness direction before and after rotation, the axial extrusion limit of the battery cell is reliable, the use of structures such as plastic limit structural members and rolling grooves can be saved, and the space utilization rate is improved.

In order to solve the technical problem, the assembly method based on the cylindrical battery comprises the following steps:

the method comprises the following steps: connecting the pole, the substrate and the upper current collecting disc through rivets;

step two: rotating the upper current collecting disc to enable a welding area of the upper current collecting disc and a lug of the battery core to rotate to one side of the substrate;

step three: welding the flat end surface of the positive electrode of the winding core with an upper current collecting disc;

step four: the upper current-collecting disc is rotated to the position of the bottom of the base plate, and the axis of the winding core and the axis of the base plate are collinear.

Further, the method also comprises the following steps:

step five: welding a lower current collecting disc on the rolled flat end surface of the negative electrode of the winding core;

step six: putting the winding core into the shell;

step seven: sealing and welding the edge of the substrate and the port of the shell;

step eight: the lower flow collecting disc is welded with the bottom plate of the shell through the liquid injection hole and the winding needle hole of the winding core.

In the assembling method, after the riveting of the battery cover plate is completed, the welding area of the upper current collecting disc and the battery core lug is rotated out from the bottom of the base plate through the rotating operation for welding, and the welding area is rotated back to the bottom of the base plate after the welding is completed, so that the folding operation is not needed, and the production efficiency is greatly improved.

In conclusion, by adopting the cylindrical battery cover plate, the cylindrical battery and the assembling method, through the optimization of the structure and the connection mode of the upper current collecting disc, the structure of the upper current collecting disc is simplified, the bending deformation does not need to be considered during design and manufacturing, the manufacturing cost is reduced, the axial limiting of the battery core is reliable, the optimization of the battery space is facilitated, in addition, the battery production and assembly processes can be simplified, and the efficiency is improved.

Drawings

In the drawings:

fig. 1 is a schematic cross-sectional view of a cylindrical battery cover plate according to the present invention.

Fig. 2 is a disassembled structure view of the cylindrical battery cover plate of the present invention.

Fig. 3 is a bottom view of the cylindrical battery cover plate of the present invention.

Fig. 4 is a top view of a cylindrical battery cover plate of the present invention.

Fig. 5 is a structural view of a rotation aid for a cylindrical battery cap plate according to the present invention.

Fig. 6 is a structural view of a lower insulating gasket of the cap plate for a cylindrical battery according to the present invention.

Fig. 7 is a structural view of an upper current collecting tray of a cylindrical battery cap plate according to the present invention.

Fig. 8 is a disassembled structural view of the cylindrical battery of the present invention.

Fig. 9 is a view showing the structure of a lower current collecting tray of the cylindrical battery according to the present invention.

Fig. 10 is a bottom view of the cylindrical battery cover plate with the upper current collector turned out of the base plate.

In the figure, 1, a pole; 11. a first through hole; 2. an upper insulating spacer; 21. a second through hole; 3. a substrate; 31. a third through hole; 32. a liquid injection hole; 4. a seal member; 5. a lower insulating base plate; 51. a fourth via hole; 52. a fifth through hole; 53. a cushion block; 54. rotating the limiting block; 6. an upper current collecting tray; 61. a sixth through hole; 62. a plate-like main body; 63. a lug; 64. a seventh via hole; 7. riveting; 8. a rotation aid; 81. rolling a groove; 82. a ball bearing; 91. a housing; 92. a lower current collecting disc; 921. a blade section; 922. a fixed part; 93. and (6) winding cores.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

Fig. 1-5 illustrate a cylindrical battery cover plate of the present invention. As shown in fig. 1-4, the cylindrical battery cover plate comprises a pole post 1, a base plate 3, an upper current collecting disc 6 and a rivet 7, wherein the pole post 1, the base plate 3 and the upper current collecting disc 6 are connected together through the rivet 7, the rivet 7 electrically connects the pole post 1 and the upper current collecting disc 6, the upper current collecting disc 6 can rotate around the axis of the rivet 7 relative to the base plate 3, and the rivet 7 is arranged at a position deviated from the center of the base plate 3.

Optionally, the head of the rivet 7 is provided at the bottom of the upper header tray 6. The top end of the rivet 7 can be movably connected with the pole 1, the substrate 3 and the upper current collecting disc 6 in a press riveting mode; the pole can also be connected with the pole 1 in a welding mode, and a certain pressure can be applied to the pole 1 to compress the substrate 3 and the upper current collecting disc 6 before welding.

During the use, go up current collection dish 6 whole and be located the bottom region of base plate 3, rotate current collection dish 6 around rivet 7 axis, can go out the welding region of going up current collection dish 6 and electric core utmost point ear from the bottom of base plate 3 and weld, rotate the bottom of getting back to base plate 3 after the welding is accomplished. In the assembling process, the upper flow collecting disc 6 does not need to be bent, each original cover plate needs to be bent twice and reduced to be bent to zero, the size deviation caused by the bending process is completely avoided, the accuracy of the electric core entering the shell is improved, the production efficiency is improved, meanwhile, the bad scrap generated by the bending process is avoided, and the production cost is reduced. In addition, after the upper current collecting disc 6 is bent, the risk of fracture caused by long-term stress on the bent part is avoided, and the safety performance of the battery is improved.

As shown in fig. 1 and 2, an upper insulating spacer 2 is disposed between the post 1 and the substrate 3, a first through hole 11 for a rivet 7 to pass through is disposed on the post 1, and a second through hole 21 for the rivet 7 to pass through is disposed on the upper insulating spacer 2.

Optionally, a counter bore groove adapted to the nut of the rivet 7 is formed at the top end of the first through hole 11, and is used for embedding the nut of the rivet 7. Go up insulating gasket 2's top surface be equipped with the recess of utmost point post 1 adaptation for inlay and put utmost point post 1, and separate utmost point post 1 and base plate 3 insulation, utmost point post 1 and last insulating gasket 2 are squarely.

As shown in fig. 1 and 2, a third through hole 31 for the rivet 7 to pass through is formed in the base plate 3, a sealing member 4 is disposed on the third through hole 31, and the sealing member 4 is used for sealing between the third through hole 31 and the rivet 7. The sealing member 4 may be an O-ring, and is disposed at the bottom end of the third through hole 31.

As shown in fig. 1 and 2, a lower insulating pad 5 is provided between the base plate 3 and the upper current collecting plate 6 to insulate and separate them, and the lower insulating pad 5 and the base plate 3 are both disc-shaped. The lower insulating base plate 5 is provided with a fourth through hole 51 for the nail column of the rivet 7 to pass through.

Optionally, a rotation auxiliary 8 is disposed between the lower insulating pad 5 and the upper current collecting disc 6, and the rotation auxiliary 8 is used to reduce the rotational friction between the upper current collecting disc 6 and the lower insulating pad 5.

After the rivet 7 is connected with the base plate 3 and the upper current collecting disc 6, the static friction force generated by axial force such as riveting force needs to be overcome by the rotation of the upper current collecting disc 6, the static friction force is too large and is not convenient for rotation operation, the rotary friction force of the upper current collecting disc 6 is reduced through the rotary auxiliary part 8, so that the rotation operation is easy, the influence on the axial connecting force is small, and the rivet 7 is kept in good contact with the upper current collecting disc 6 and the pole 1, namely, a good conduction state is kept.

In addition, the rotary auxiliary member 8 can be a plane bearing sleeved on the rivet column of the rivet 7, the structure is simple, the rotation is flexible, and the axial direction can bear larger axial force, such as riveting force and the like. The rotation auxiliary member 8 may be a flat rolling disk structure as shown in fig. 5, and has an annular base body, a rolling groove 81 is provided on an end surface of the base body, a ball 82 is fitted into the rolling groove 81, and the ball 82 protrudes from a surface of the rolling groove 81 and is in rolling contact with a surface of the upper current collecting disk 6.

Optionally, as shown in fig. 6, a cushion block 53 and a rotation limiting block 54 are further disposed on the bottom surface of the lower insulating base plate 5, the height of the cushion block 53 is the same as that of the rotation auxiliary member 8, and the cushion block 53 is used for providing a supporting force when the winding core 93 is axially extruded for limiting, and the rotation limiting block 54 is used for limiting the rotation of the upper current collecting disc 6, so as to ensure that the welded current collecting disc can return to the original design position and be aligned with the center of the base plate 3.

Optionally, as shown in fig. 1 and 2, the center of the substrate 3 is provided with an electrolyte injection hole 32, the lower insulating base plate 5 is provided with a fifth through hole 52, the upper current collecting disc 6 is provided with a sixth through hole 61, and the electrolyte injection hole 32, the fifth through hole 52 and the sixth through hole 61 are vertically aligned, so that on one hand, the electrolyte injection is smoother, during the electrolyte injection, the electrolyte is directly injected from the center of the winding core 93 and permeates and diffuses towards the inside, the electrolyte permeation pressure is more uniform than that during the electrolyte injection from the eccentric position of the traditional cover plate, the electrolyte permeation speed is higher, the electrolyte injection time is favorably reduced, and the electrolyte injection production efficiency is improved; on the other hand, when the lower current collecting disc 92 is welded to the bottom of the case 91, the welding head may be extended from the position of the liquid pouring hole 32, and fixed by ultrasonic welding or resistance welding through the winding pin hole in the winding core 93 to the welding region of the lower current collecting disc 92. An explosion-proof valve 33 is also provided on the base plate 3.

As shown in fig. 7, the upper current collecting plate 6 includes a rectangular plate-shaped main body 62 and a lug 63 provided on one side of the plate-shaped main body 62, the plate-shaped main body 62 is used for welding with a battery cell tab, and the lug 63 is provided with a seventh through hole 64 for passing a stud of the rivet 7.

In the existing upper current collecting disc 6 structure, the connecting part needing to be folded is removed, and only the part welded with the pole ear of the battery core and the part riveted with the rivet 7 are reserved, namely the upper current collecting disc 6 structure of the invention. Therefore, the size of the upper flow collecting disc 6 is smaller than that of the base plate 3, and the upper flow collecting disc 6 is completely covered at the bottom of the base plate 3 when viewed from the top of the base plate 3, so that the manufacturing cost is greatly saved, and the structure is simplified.

The design requirement of a cylindrical battery with high capacity and high multiplying power can be met, in order to meet the overcurrent capacity of the battery, the thickness of the upper current collecting disc 6 can be increased within the design range, the processing difficulty caused by bending is not needed to be considered, meanwhile, compared with a bendable current collecting disc, the length of the rotary current collecting disc is greatly shortened, the material cost is reduced in terms of cost, and in the physical aspect, under the condition that the material, the sectional area and the like of a lug are consistent, the shorter the length of the lug is, the lower the internal resistance of the battery is, and the smaller the heat generated when the current flows through the rotary current collecting disc is, so that the safety performance of the battery is facilitated.

The plate-like body 62 is rectangular, and a lug 63 is formed by protruding from one side of the plate-like body, and a seventh through hole 64 is formed thereon to be engaged with the rivet 7, so that the plate-like body 62 can rotate. When riveting, the plate-like body 62 is located at a position coinciding with the center of the base plate 3, that is, at a position where one side of the lug 63 contacts and is limited by the rotation limiting block 54, and when welding, the plate-like body 62 is rotated out of the bottom of the base plate 3, so that there is a sufficient space for welding operation, and after welding, the plate-like body 62 is rotated back to the initial riveting position.

Optionally, a welding area is disposed on the plate-shaped body 62, and a top surface of the welding area protrudes from the plate-shaped column 62, so as to facilitate laser welding. The weld zone is in a symmetrical V-shape.

Fig. 8 shows a cylindrical battery of the present invention. As shown in fig. 8, the cylindrical battery includes the cylindrical battery cover plate as described above, and further includes a case 91, a lower current collecting disk 92 and a winding core 93, the end of the case 91 is welded to the edge of the base plate 3 in a sealing manner, the upper current collecting disk 6 is welded to the positive electrode tab of the winding core 93, and the lower current collecting disk 92 is welded to the negative electrode tab of the winding core 93 and is welded to the bottom plate of the case 91.

In order to prevent the winding core 93 from shaking up and down in the shell 91, the base plate 3, the lower insulating base plate 5, the upper current collecting disc 6 and the lower current collecting disc 92 are extruded and stressed at the bottom of the shell 91 at two ends of the battery winding core 93, so that the tight fit of the battery is ensured. Compared with the traditional positive and negative electrode double cover plate structure and the rolling groove structure, the invention improves the space utilization rate of the roll core 93 in the height direction in the shell 91, improves the energy density of the single battery, only needs one peripheral welding operation of the positive electrode substrate 3 and the port of the shell 91, improves the peripheral welding production efficiency, reduces the reject ratio generated by peripheral welding process welding and reduces the production cost.

As shown in fig. 9, the lower collector 92 has a four-bladed shape, and includes four negative electrode welding blade portions 921 to the winding core 93, and a central fixing portion 922 to the bottom plate.

The invention relates to an assembly method based on the cylindrical battery, which comprises the following steps:

step S10: the pole 1, the base plate 3 and the upper current collecting plate 6 are connected by a rivet 7. The post of the rivet 7 sequentially penetrates through the pole 1, the upper insulating gasket 2, the base plate 3, the sealing element 4, the lower insulating base plate 5 and the through hole in the upper current collecting disc 6, and is riveted and fixed to assemble the battery cover plate.

Step S20: the upper current collecting disc 6 is rotated to rotate the welding area of the upper current collecting disc 6 and the cell tab to one side of the substrate 3, as shown in fig. 10.

Step S30: the flattened end face of the positive electrode of the winding core 93 is welded, typically by laser welding, to the upper current collector 6, the welding area being as shown in fig. 7.

Step S40: and rotating the upper current collecting disc 6 to return to the position at the bottom of the base plate 3, and enabling the axis of the winding core 93 to be collinear with the axis of the base plate 3, so that the welding of the battery cover plate and the winding core 93 is completed.

Optionally, the method further includes:

step S50: the lower current collecting plate 92 is welded to the negative electrode flat end surface of the winding core 93.

Step S60: core 93 is placed into shell 91. The winding core 93 after the upper current collecting disc 6 and the lower current collecting disc 92 are welded is placed into the shell, and the winding core 93 is guaranteed not to shake up and down in the shell 91.

Step S70: the edge of the substrate 3 is seal-welded to the port of the housing 91. Then, the edge of the base plate 3 and the edge of the case 91 are welded by laser welding.

Step S80: the lower collector plate 92 is welded to the bottom plate of the casing 91 through the pour hole 32 and the winding hole of the winding core 93. And (3) extending a welding head from the position of the battery cell liquid injection hole 32 to the fixing part 922 of the lower current collecting disc 92 through the center of the winding core 93, and welding the negative current collecting disc with the bottom of the shell 91 by using an ultrasonic welding or resistance welding mode.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading this disclosure, those skilled in the art will be able to make various changes, modifications and equivalents to the embodiments of the invention, which fall within the scope of the appended claims.

Claims

1. The utility model provides a cylinder battery apron, its characterized in that includes utmost point post (1), base plate (3), goes up current collection dish (6) and rivet (7), utmost point post (1) base plate (3) with go up current collection dish (6) and pass through rivet (7) link together, just rivet (7) electric connection utmost point post (1) with go up current collection dish (6), go up current collection dish (6) can wind rivet (7) axis rotates, the skew is located in rivet (7) the position at base plate (3) center.

2. The cylindrical battery cover plate according to claim 1, wherein an upper insulating gasket (2) is arranged between the pole (1) and the substrate (3), a first through hole (11) for the rivet (7) to pass through is formed in the pole (1), and a second through hole (21) for the rivet (7) to pass through is formed in the upper insulating gasket (2).

3. The cylindrical battery cover plate according to claim 1, wherein a third through hole (31) for the stud of the rivet (7) to pass through is formed in the base plate (3), a sealing member (4) is disposed on the third through hole (31), and the sealing member (4) is used for sealing between the third through hole (31) and the stud of the rivet (7).

4. The cylindrical battery cover plate according to claim 1, wherein a lower insulating pad (5) is arranged 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 arranged on the lower insulating pad (5).

5. The cylindrical battery cover plate according to claim 4, wherein a rotation auxiliary member (8) is provided between the lower insulating pad (5) and the upper current collecting disc (6), and the rotation auxiliary member (8) is used for reducing the rotational friction force between the upper current collecting disc (6) and the lower insulating pad (5).

6. The cylindrical battery cover plate according to claim 5, wherein the base plate (3) is provided with a liquid injection hole (32) at the center, the lower insulating pad (5) is provided with a fifth through hole (52), the upper current collecting plate (6) is provided with a sixth through hole (61), and the liquid injection hole (32), the fifth through hole (52) and the sixth through hole (61) are vertically aligned.

7. The cylindrical battery cover plate of claim 1, wherein the upper current collecting plate (6) comprises a rectangular plate-shaped main body (62) and a lug (63) arranged on one side of the plate-shaped main body (62), the plate-shaped main body (62) is used for welding with a battery cell tab, and a seventh through hole (64) for the rivet (7) to pass through is arranged on the lug (63).

8. A cylindrical battery comprising the cylindrical battery cover plate according to any one of claims 1 to 7, and further comprising a shell (91), a lower current collecting disk (92) and a winding core (93), wherein the end opening of the shell (91) is hermetically welded with the edge of the base plate (3), the upper current collecting disk (6) is welded with the positive electrode tab of the winding core (93), and the lower current collecting disk (92) is welded with the negative electrode tab of the winding core (93) and is fixedly welded with the bottom plate of the shell (91).

9. A method for assembling a cylindrical battery according to claim 8, comprising the steps of:

the method comprises the following steps: connecting the pole (1), the substrate (3) and the upper current collecting disc (6) through a rivet (7);

step two: rotating the upper current collecting disc (6) to enable a welding area of the upper current collecting disc (6) and the electric core lug to rotate to one side of the substrate (3);

step three: welding the anode flattening end surface of the winding core (93) with the upper current collecting disc (6);

step four: the upper collector (6) is rotated back to the position at the bottom of the base plate (3) and the core (93) is brought into line with the axis of the base plate (3).

10. An assembly method according to claim 9, further comprising:

step five: a lower current collecting disc (92) is welded on the anode flattened end surface of the winding core (93);

step six: placing the winding core (93) into the shell (91);

step seven: sealing and welding the edge of the substrate (3) and the port of the shell (91);

step eight: the lower collecting tray (92) is welded with the bottom plate of the shell (91) through the liquid injection hole (32) and the winding needle hole of the winding core (93).