CN219575880U - Assembly structure of cylindrical battery, battery module and battery pack - Google Patents

Abstract

The utility model provides an assembly structure of a cylindrical battery, the cylindrical battery, a battery module and a battery pack, and relates to the field of batteries. The assembly structure of the cylindrical battery is used for assembling the cylindrical battery therein; the assembly structure comprises: positive electrode current collecting plate and positive electrode post. The positive pole post comprises a first circular ring which is arranged along the axial direction; the first ring comprises a first ring first surface and a first ring second surface which is contacted with the first surface of the positive electrode current collecting disc; the positive electrode current collecting disc comprises a positive electrode current collecting disc first surface, a positive electrode current collecting disc second surface in contact with the bare cell and a positive electrode circular ring axially protruding in the middle of the positive electrode current collecting disc first surface; the protruding direction of the positive electrode ring is close to that of the first ring, and the circumferential outer wall of the positive electrode ring is abutted with the circumferential inner wall of the first ring; the positive electrode current collecting disc is configured to electrically connect the positive electrode tab and the positive electrode post. By using the assembly structure provided by the utility model, the overcurrent capacity of the battery cell is improved, so that the service life of the battery cell can be prolonged.

Description

Assembly structure of cylindrical battery, battery module and battery pack

Technical Field

The utility model relates to the field of batteries, in particular to an assembly structure of a cylindrical battery, the cylindrical battery, a battery module and a battery pack.

Background

The cylindrical battery cell is a battery technology, and has outstanding advantages in battery performance and economy. At present, two packaging forms of the cylindrical battery cell exist, one is laser welding, and the other is pier sealing; the cover plate is directly welded on the shell by laser welding, and compared with the pier sealed volume, the laser welding has the advantages of higher utilization rate, better sealing performance and higher overcurrent capacity, and is widely applied to the packaging scheme of the cylindrical battery cell.

However, the packaging is performed in a laser welding mode at present, and the problem that the overcurrent capacity cannot meet the requirement of a high-rate quick-charging battery still exists.

Disclosure of Invention

In view of the above problems, an object of the embodiments of the present utility model is to provide a cylindrical battery assembly structure, a cylindrical battery, a battery module, and a battery pack, where the cylindrical battery assembly structure improves the current capacity of a battery cell by improving the design of a positive current collecting plate, so as to prolong the service life of the battery cell.

In a first aspect, embodiments of the present utility model provide an assembling structure of a cylindrical battery, for assembling the cylindrical battery therein; the cylindrical battery has an axial direction and a radial direction which are perpendicular to each other; the assembly structure includes: a positive electrode current collecting plate and a positive electrode post; the positive pole post comprises a first circular ring arranged along the axial direction; the first ring comprises a first ring first surface and a first ring second surface which is contacted with the first surface of the positive electrode current collecting disc; the positive electrode current collecting disc comprises a positive electrode current collecting disc first surface, a positive electrode current collecting disc second surface in contact with the bare cell and a positive electrode circular ring which is convexly arranged in the axial middle of the positive electrode current collecting disc first surface along the axial direction; the protruding direction of the positive electrode circular ring is close to that of the first circular ring, and the circumferential outer wall of the positive electrode circular ring is abutted with the circumferential inner wall of the first circular ring; the positive electrode current collecting disc is configured to electrically connect a positive electrode tab and the positive electrode post.

In the implementation process, the assembly structure provided by the embodiment of the utility model is characterized in that a thickened convex part (positive electrode circular ring) is arranged at the center of the positive electrode current collecting disc, and the convex part is connected with the positive electrode post; through the special design of the positive electrode current collecting disc, the overcurrent capacity of the battery cell is improved while the simplification of the process is ensured.

Optionally, in an embodiment of the present utility model, the positive electrode current collecting disc further includes a through hole; the through holes are arranged along the radial direction, and the through holes are configured to observe the contact state of the positive electrode current collecting disc and the positive electrode lug.

In the implementation process, the positive electrode current collecting disc in the assembly structure of the cylindrical battery provided by the embodiment of the utility model is provided with a plurality of through holes along the radial direction, so that the contact state of the positive electrode current collecting disc and the positive electrode lug can be better observed through the through holes, and the efficiency of assembling the battery cell can be greatly improved.

Optionally, in an embodiment of the present utility model, the assembly structure further includes a housing; the positive electrode current collecting disc also comprises a positive electrode turnover piece; the positive electrode turnover piece is arranged at the radial tail end of the positive electrode current collecting disc, turnover towards the direction close to the positive electrode post and is abutted to the shell so as to fix the positive electrode current collecting disc.

In the implementation process, the radial tail end of the positive electrode current collecting disc in the assembly structure provided by the embodiment of the utility model is expected to be close to the direction of the positive electrode post to be folded, and when the positive electrode current collecting disc is assembled, the folded edge is deformed inwards to be abutted with the shell; due to the arrangement of the turnover edges, the reinforcement and support effects can be generated, so that the positive electrode current collecting disc is better packaged in the shell, and the structural stability of the cylindrical battery assembled by adopting the assembly structure is improved.

Optionally, in an embodiment of the present utility model, the assembly structure further includes a first sealing spike; the positive pole post further comprises a second circular ring along the axial direction; the second circular ring is connected to the first surface of the first circular ring along the axial direction; the inner diameter and the outer diameter of the second circular ring are larger than the inner diameter of the first circular ring and smaller than the outer diameter of the first circular ring; the first sealing nail comprises a first cylinder and a second cylinder along the axial direction; the diameter of the first cylinder is equal to the inner diameter of the positive electrode circular ring, and the first cylinder is configured to be clamped in a first cavity formed by the positive electrode circular ring; the diameter of the second cylinder is equal to the inner diameter of the second circular ring, and the second cylinder is configured to be clamped in a second cavity formed by the inner walls of the second circular ring; the first sealing spike is configured to seal the liquid injection hole.

In the implementation process, the battery assembly structure provided by the embodiment of the utility model comprises the first sealing nail, wherein when the first cylinder of the first sealing nail is clamped in the first cavity formed by the positive electrode circular ring, the second cylinder is clamped in the cavity formed by the inner wall of the second circular ring; in the sealing process, the first sealing nail is applied with acting force for extruding the central circular ring, so that the first sealing nail is compressed and deformed to form sealing of the liquid injection hole, the risk of leakage of electrolyte from the liquid injection hole can be reduced, and the safety of the cylindrical battery adopting the assembly structure is improved under the use condition.

Optionally, in an embodiment of the present utility model, the assembly structure further includes a second sealing spike; the positive pole post further comprises a third circular ring connected with the second circular ring along the axial direction; the inner diameter of the third ring is larger than the inner diameter of the second ring and smaller than the outer diameter of the second ring; the outer diameter of the third circular ring is larger than that of the second circular ring; the second sealing nail is configured to be clamped in a third cavity formed by the inner wall of the third circular ring; the second seal pin is configured to be insulated from the first seal pin.

In the implementation process, the battery assembly structure provided by the embodiment of the utility model further comprises the second sealing nail, and the second sealing nail isolates the inside and the outside of the opening, so that the functions of insulation and sealing are realized; meanwhile, under the cooperation of the first sealing nail and the second sealing nail, the problem of electrolyte leakage under the condition of poor welding of the second sealing nail can be effectively avoided.

Optionally, in an embodiment of the present utility model, the assembly structure further includes an insulating member; the insulating piece is sleeved between the shell and the positive pole post so as to isolate the positive pole post from the shell.

In the implementation process, the assembly structure provided by the embodiment of the utility model further comprises an insulating part sleeved between the shell and the positive pole, and the shell and the positive pole can be insulated and isolated through the cooperation of the insulating part.

Optionally, in an embodiment of the present utility model, the assembly structure further includes: a negative electrode current collecting plate; the negative current collecting disc has a negative current collecting disc first surface proximate to the bare cell; the negative electrode current collecting disc comprises a negative electrode circular ring which is convexly arranged in the axial direction of the axial middle part of the first surface of the negative electrode current collecting disc; the negative electrode ring is connected with the winding pin hole of the bare cell so as to connect the negative electrode current collecting disc with the bare cell.

In the implementation process, the assembly structure of the cylindrical battery provided by the embodiment of the utility model further comprises a negative electrode current collecting disc; the negative electrode current collecting disc is provided with the negative electrode circular ring protruding towards the direction of the bare cell, and the alignment and welding of the rolling pin hole of the bare cell in the assembly process are facilitated through the arrangement of the negative electrode circular ring, so that the assembly difficulty is reduced.

Optionally, in an embodiment of the present utility model, the assembly structure further includes: a negative electrode cover plate; the negative electrode cover plate is provided with a protruding structure protruding towards the negative electrode current collecting disc, and the protruding structure is configured to increase the strength of the joint surface.

In the implementation process, the negative electrode cover plate in the assembly structure provided by the embodiment of the utility model is provided with the protruding structure protruding towards the direction of the negative electrode current collecting disc, and the protruding structure can increase the strength of the joint surface, so that the assembly structure provided by the utility model and the stability of the cylindrical battery adopting the assembly structure in structure are increased.

In a second aspect, an embodiment of the present utility model provides a cylindrical battery including: bare cell and the assembly structure provided by the first aspect of the utility model.

In a third aspect, an embodiment of the present utility model provides a battery module, which includes the cylindrical battery provided in the second aspect of the present utility model.

In a fourth aspect, an embodiment of the present utility model provides a battery pack, including the battery module provided in the third aspect of the present utility model.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded first schematic view of an assembly structure provided by an embodiment of the present utility model;

FIG. 2 is a schematic view of an assembly structure according to an embodiment of the present utility model;

FIG. 3 is a partial cross-sectional view of an assembled structure provided in an embodiment of the present utility model;

FIG. 4 is an exploded second schematic view of the mounting structure provided by the embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a positive current collecting plate according to an embodiment of the present utility model;

FIG. 6 is a partial cross-sectional view of an anode of an assembly structure according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a negative current collecting plate according to an embodiment of the present utility model;

fig. 8 is a schematic structural diagram of a negative electrode cover plate according to an embodiment of the present utility model.

Reference numerals: bare cell-1; a housing-2; an opening-21; a liquid injection hole-3; -100 of an assembly structure; a positive electrode current collecting plate-110; positive electrode current collecting plate first surface-1111; a second surface-1112 of the positive current collecting plate; positive pole ring-112; a circumferential outer wall-1121 of the positive electrode ring; a through hole-113; positive pole turnover piece-114; positive electrode post-120; a first ring-121; first annular first surface-1211; first annular second surface-1212; a circumferential inner wall-1213 of the first annular ring; a second ring-122; a third ring-123; a first seal pin-130; a first cylinder-131; a second cylinder-132; a second sealing spike-140; an insulator-150; an upper insulator-151; a gasket-152; a lower insulator-153; a negative electrode current collecting plate-160; negative current collecting plate first surface-161; negative pole ring-162; bar-shaped through holes-163; annular through-hole-164; a negative electrode cover plate-170; raised structures-171; an outer ring step-172; through groove-173.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the utility model may be combined with other embodiments.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present utility model is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present utility model, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present utility model, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the utility model shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the utility model in any way.

In the embodiment of the utility model, the circle is not necessarily a perfect circle, and includes a perfect circle and a suspected circle.

The applicant has found during the course of research that at present, the following problems exist with the cylindrical cell designs using the laser welding form: the overcurrent capacity between the positive terminal and the current collecting disc still cannot meet the requirements of the high-rate quick-charging battery; most designs adopt liquid injection from the holes on the side of the positive electrode terminal, but poor welding can be caused by factors such as gasification of electrolyte and the like during the subsequent sealing nail welding, and the yield is affected; sealing between the shell and the pole, and welding between the cathode current collecting disc and the shell as well as between the cathode current collecting disc and the cover plate.

Based on the above, the embodiment of the utility model provides an assembly structure of a cylindrical battery, the cylindrical battery, a battery module and a battery pack; the assembly structure of the cylindrical battery not only can ensure the insulation tightness, but also can simplify the process; meanwhile, the overcurrent capacity of the battery core can be improved through the special design of the positive electrode current collecting disc and the negative electrode current collecting disc.

Referring to fig. 1, fig. 1 is an exploded first schematic view of an assembly structure according to an embodiment of the utility model; referring to fig. 2 and 3 in combination, fig. 2 is a schematic view of an assembling structure according to an embodiment of the utility model; FIG. 3 is a cross-sectional view of an assembled structure according to an embodiment of the present utility model; fig. 3 is an enlarged schematic view of a portion a in fig. 2, and an embodiment of the present utility model provides an assembly structure 100 of a cylindrical battery; the mounting structure 100 is for mounting a cylindrical battery therein; the cylindrical battery has an axial direction and a radial direction perpendicular to each other, and the a direction is the axial direction and the b direction is the radial direction as shown in fig. 1.

As shown in fig. 1, the fitting structure 100 includes: a positive current collecting plate 100 and a positive electrode post 120.

The bare cell is a component of a cylindrical battery, in which chemical reaction occurs, and is mainly formed by winding or stacking a positive electrode plate and a negative electrode plate, and a separator is generally disposed between the positive electrode plate and the negative electrode plate. The parts of the positive pole piece and the negative pole piece with active substances form the main body part of the bare cell, and the parts of the positive pole piece and the negative pole piece without active substances form the electrode lugs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. In the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the lugs are connected with the poles to form a current loop.

The battery also comprises a positive electrode current collecting disc and a negative electrode current collecting disc; the electrode pole of the battery cell is connected with the bare cell through the current collecting disc, so that the electric energy of the bare cell is led out through the electrode pole.

With continued reference to fig. 1 and 3, the positive electrode post 120 includes a first annular ring 121 disposed along the axial direction a. The first ring 121 includes a first ring first surface 1211 and a first ring second surface 1212 in contact with the positive current collector plate first surface 1111.

The positive electrode current collecting plate 100 comprises a positive electrode current collecting plate first surface 1111, a positive electrode current collecting plate second surface 1112 in contact with the bare cell 1 along the axial direction a, and a positive electrode circular ring 112 protruding in the middle of the positive electrode current collecting plate first surface 1111 along the axial direction a.

The positive electrode ring 112 is projected in a direction close to the first ring 121, and the circumferential outer wall 1121 of the positive electrode ring abuts against the circumferential inner wall 1213 of the first ring. The positive electrode collector plate 100 is configured to electrically connect the positive electrode tab and the positive electrode post 120.

In some embodiments, the positive ring 1121 is designed with localized thickening to enhance the overcurrent capability between the positive terminal and the current collecting plate. Illustratively, the thickness of the positive electrode ring 1121 may be between 0.5 and 1.0mm, and the outer diameter of the positive electrode ring 1121 may be between 6 and 10 mm.

As can be seen from fig. 1 and 3, the assembly structure provided by the embodiment of the present utility model is provided with a thickened convex portion at the center of the positive current collecting plate, and the convex portion is connected with the positive post; through the special design of the positive electrode current collecting disc, the overcurrent capacity of the battery cell is improved while the simplification of the process is ensured.

With continued reference to fig. 4 and 5, fig. 4 is an exploded second schematic view of the assembly structure according to the embodiment of the present utility model; fig. 5 is a schematic structural diagram of a positive current collecting plate according to an embodiment of the present utility model; the positive electrode current collecting plate 100 further includes a through hole 113; the through holes 113 are disposed along the radial direction b, and are configured to observe the contact state of the positive electrode collector plate 100 and the positive electrode tab. For example, the positive electrode collector plate 100 is provided with a plurality of through holes 113 at equal angles along the radial direction b, through which the contact state of the positive electrode collector plate 100 and the positive electrode tab can be observed.

Therefore, in the assembly structure of the cylindrical battery provided by the embodiment of the utility model, the positive electrode current collecting disc is provided with a plurality of through holes along the radial direction b, and the contact state of the positive electrode current collecting disc and the positive electrode lug can be better observed through the through holes.

In fig. 4, the assembly structure 100 further comprises a housing 2; the case 2 has an opening 21, as shown in fig. 3, a liquid injection hole 3 is provided between the positive electrode post 120 and the current collecting plate, and the liquid injection hole 3 communicates with the inside and outside space of the case 2 so that the electrolyte flows into the inside of the case 2 through the liquid injection hole 3.

The positive electrode current collecting plate 100 further includes a positive electrode turnover member 114, and the positive electrode turnover member 114 is disposed at the radial b end of the positive electrode current collecting plate 100, turned in a direction close to the positive electrode post 120, and abuts against the case 2 to fix the positive electrode current collecting plate 100.

Therefore, the radial end b of the positive electrode current collecting disc in the assembly structure provided by the embodiment of the utility model is expected to be close to the direction of the positive electrode post to be folded, and when the positive electrode current collecting disc is assembled, the folded edge is deformed inwards to be abutted with the shell; due to the arrangement of the turnover edges, the reinforcement and support effects can be generated, so that the positive electrode current collecting disc is better packaged in the shell, and the structural stability of the cylindrical battery assembled by adopting the assembly structure is improved.

With continued reference to fig. 4, as shown in fig. 4, the mounting structure 100 provided by the embodiment of the present utility model further includes a first sealing pin 130. Referring to fig. 6, fig. 6 is a partial cross-sectional view of an anode of an assembly structure according to an embodiment of the utility model, and fig. 6 is an enlarged schematic view of a portion B in fig. 2. The first sealing pin 130 includes a first cylinder 131 and a second cylinder 132 in the axial direction a.

With continued reference to fig. 6, the positive electrode post 120 according to the embodiment of the present utility model further includes a second ring 122 along the axial direction a. The second ring 122 is connected to the first ring first surface 1211 along the axial direction a; the inner and outer diameters of the second ring 122 are larger than the inner diameter of the first ring 121 and smaller than the outer diameter of the first ring 121.

The diameter of the first cylinder 131 is equal to the inner diameter of the positive electrode ring 112, and the first cylinder 131 is configured to be clamped in a first cavity formed by the positive electrode ring 112. The diameter of the second cylinder 132 is equal to the inner diameter of the second ring 122, and the second cylinder 132 is configured to be clamped in a second cavity formed by the inner walls of the second ring; the first sealing spike 130 is configured to seal the pouring orifice 3.

Therefore, the battery assembly structure provided by the embodiment of the utility model comprises the first sealing nail, wherein when the first cylinder of the first sealing nail is clamped in the first cavity formed by the positive electrode circular ring, the second cylinder is clamped in the cavity formed by the inner wall of the second circular ring; in the sealing process, the first sealing nail is applied with acting force for extruding the central circular ring, so that the first sealing nail is compressed and deformed to form sealing of the liquid injection hole, the risk of leakage of electrolyte from the liquid injection hole can be reduced, and the safety of the cylindrical battery adopting the assembly structure is improved under the use condition.

With continued reference to fig. 4 and 6, the mounting structure 100 further includes a second sealing spike 140; the positive electrode post 120 further includes a third ring 123 connected to the second ring 122 along the axial direction a. The inner diameter of the third ring 123 is larger than the inner diameter of the second ring 122 and smaller than the outer diameter of the second ring 122; the outer diameter of the third ring 123 is larger than the outer diameter of the second ring 122.

The second sealing nail 140 is configured to be clamped in a third cavity formed by the inner wall of the third circular ring 123; the second sealing nail 140 is configured to be insulated from the first sealing nail 130.

In some embodiments, the circumferential inner wall of the third ring 123 may be provided in a chamfered groove shape; meanwhile, the circumferential outer wall of the second sealing nail 140 is matched therewith; the circumferential outer wall of the second sealing nail 140 is clamped to the circumferential inner wall of the third ring 123, so that welding is convenient, and sealing performance can be improved.

Therefore, the battery assembly structure provided by the embodiment of the utility model further comprises the second sealing nail, and the second sealing nail isolates the inside and the outside of the opening, so that the functions of insulation and sealing are realized; meanwhile, under the cooperation of the first sealing nail and the second sealing nail, the problem of electrolyte leakage under the condition of poor welding of the second sealing nail can be effectively avoided.

In an alternative embodiment, with continued reference to fig. 4 and 6, the mounting structure 100 further includes an insulator 150. The insulator 150 is sleeved between the case 2 and the positive electrode post 120 to isolate the positive electrode post 120 from the case 2.

In some possible embodiments, the insulator 150 includes an upper insulator 151, a gasket 152, and a lower insulator 153; the upper insulating member 151 may be made of a hard plastic material, the sealing pad 152 may be made of an electrolyte-resistant rubber material such as ethylene propylene diene monomer rubber, and the lower insulating member 153 may be made of a soft plastic material such as PET; the gasket 152 is an interference fit to ensure tightness, and the positive electrode post 120 is punched downward during assembly to compress the upper insulator 151, the gasket 152, and the lower insulator 153.

Therefore, the assembly structure provided by the embodiment of the utility model further comprises an insulating part sleeved between the shell and the positive pole, and the shell and the positive pole can be insulated and isolated through the cooperation of the insulating part.

In an alternative embodiment, as shown in fig. 4, the mounting structure 100 further includes: and a negative current collecting plate 160. Referring to fig. 7, fig. 7 is a schematic structural diagram of a negative current collecting plate according to an embodiment of the present utility model; the negative current collector plate 160 has a negative current collector plate first surface 161 proximate to the bare cell 1; the anode current collecting plate 160 includes an anode ring 162 protruding in the axial direction a at the middle of the axial direction a of the anode current collecting plate first surface 161.

The negative electrode ring 162 is connected with the winding pin hole of the bare cell to connect the negative electrode current collecting disc 162 and the bare cell 1.

As can be seen from fig. 4 and 7, the assembly structure of the cylindrical battery provided by the embodiment of the utility model further includes a negative electrode current collecting plate; the negative electrode current collecting disc is provided with the negative electrode circular ring protruding towards the direction of the bare cell, and the alignment and welding of the rolling pin hole of the bare cell in the assembly process are facilitated through the arrangement of the negative electrode circular ring, so that the assembly difficulty is reduced.

In some possible embodiments, the anode current collecting plate 160 is provided with a bar-shaped through hole 163 along the radial direction b, and an annular through hole 164 is provided at the radial direction b end of the anode current collecting plate 160; the strip-shaped through holes 163 and the annular through holes 164 are beneficial to contact between the negative electrode current collecting disc 160 and the negative electrode lugs, and meanwhile, the subsequent infiltration of electrolyte is facilitated.

In some possible embodiments, the radial b end portion of the negative current collecting plate 160 is slotted and is beveled in the axial direction a, in a direction away from the bare cell 1, forming a negative beveled edge; through the arrangement of the negative electrode turning edge, the negative electrode turning edge can be set to be 3-6 petals, and 4 petals are optimal, so that the negative electrode turning edge is beneficial to tightly welding with the shell 2 in contact during subsequent assembly.

In an alternative embodiment, as shown in fig. 4, the mounting structure 100 further includes: and a negative electrode cap plate 170. Referring to fig. 8, fig. 8 is a schematic structural diagram of a negative electrode cover plate 170 according to an embodiment of the utility model; the anode cap plate 170 is provided with a protrusion structure 171 protruding toward the anode current collecting plate 160, and the protrusion structure 171 is configured to increase the strength of the coupling surface.

As can be seen from fig. 8, in the assembly structure provided by the embodiment of the utility model, the anode cover plate is provided with a protruding structure protruding towards the anode current collecting disc, and the protruding structure can increase the strength of the joint surface, so that the assembly structure provided by the utility model and the stability of the cylindrical battery adopting the assembly structure in structure are increased.

In some possible embodiments, the radial b end of the negative cover plate 170 is stamped inward to form an outer ring step 172 to facilitate overlap and laser welding with the housing 2 during subsequent assembly.

In some possible embodiments, the periphery of the raised structure 171 of the negative cover plate 170 is provided with a ring of unsealed through-slots 173, and the through-slots 173 function as explosion-proof valves.

A second aspect of the present utility model provides a cylindrical battery, referring to fig. 8, comprising: a bare cell 1 and a mounting structure 100 as provided in the first aspect.

The assembly process of the cylindrical battery is as follows:

firstly, the bare cell is respectively welded with the positive electrode current collecting disc and the negative electrode current collecting disc by laser. And plugging the bare cell into the shell assembly, wherein the positive electrode circular ring of the positive electrode current collecting disc is flush with the first circular ring of the positive electrode post, and welding seams between the positive electrode circular ring and the first circular ring by laser welding.

Further, reversely placing the cylindrical battery cell, placing a negative electrode cover plate, and performing laser welding; after the welding is finished, the working procedures of liquid injection, formation and the like are carried out; after the secondary injection is completed, the first sealing nail is plugged into the positive pole post; alcohol wiping and cleaning are carried out on the top of the positive pole post, a second sealing manuscript is put into the positive pole post, and sealing nail laser welding is carried out; thus, the battery is assembled, and the final procedures of capacity division, OCV and the like are performed.

The battery module power battery module of the third aspect of the utility model comprises the cylindrical battery of the second aspect, the battery pack of the fourth aspect comprises the battery module of the third aspect, and the battery module power battery module also has at least all the beneficial effects brought by the technical scheme of the assembly structure embodiment of the positive electrode post and the positive electrode current collecting disc.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (11)

1. An assembling structure of a cylindrical battery, characterized in that the assembling structure is used for assembling the cylindrical battery therein; the cylindrical battery has an axial direction and a radial direction which are perpendicular to each other;

the assembly structure includes: a positive electrode current collecting plate and a positive electrode post;

the positive pole post comprises a first circular ring arranged along the axial direction; the first ring comprises a first ring first surface and a first ring second surface which is contacted with the first surface of the positive electrode current collecting disc;

the positive electrode current collecting disc comprises a positive electrode current collecting disc first surface, a positive electrode current collecting disc second surface in contact with the bare cell and a positive electrode circular ring which is convexly arranged in the axial middle of the positive electrode current collecting disc first surface along the axial direction;

the protruding direction of the positive electrode circular ring is close to that of the first circular ring, and the circumferential outer wall of the positive electrode circular ring is abutted with the circumferential inner wall of the first circular ring;

the positive electrode current collecting disc is configured to electrically connect a positive electrode tab and the positive electrode post.

2. The assembly structure of claim 1, wherein the positive current collecting plate further comprises a through hole;

the through holes are arranged along the radial direction, and the through holes are configured to observe the contact state of the positive electrode current collecting disc and the positive electrode lug.

3. The fitting structure of claim 1, further comprising a housing;

the positive electrode current collecting disc also comprises a positive electrode turnover piece;

the positive electrode turnover piece is arranged at the radial tail end of the positive electrode current collecting disc, turnover towards the direction close to the positive electrode post and is abutted to the shell so as to fix the positive electrode current collecting disc.

4. The fitting structure of claim 3, further comprising a first sealing spike; the positive pole post further comprises a second circular ring along the axial direction;

the second circular ring is connected to the first surface of the first circular ring along the axial direction; the inner diameter and the outer diameter of the second circular ring are larger than the inner diameter of the first circular ring and smaller than the outer diameter of the first circular ring;

the first sealing nail comprises a first cylinder and a second cylinder along the axial direction;

the diameter of the first cylinder is equal to the inner diameter of the positive electrode circular ring, and the first cylinder is configured to be clamped in a first cavity formed by the positive electrode circular ring;

the diameter of the second cylinder is equal to the inner diameter of the second circular ring, and the second cylinder is configured to be clamped in a second cavity formed by the inner walls of the second circular ring;

the first sealing spike is configured to seal the liquid injection hole.

5. The fitting structure of claim 4, further comprising a second sealing spike; the positive pole post further comprises a third circular ring connected with the second circular ring along the axial direction;

the inner diameter of the third ring is larger than the inner diameter of the second ring and smaller than the outer diameter of the second ring; the outer diameter of the third circular ring is larger than that of the second circular ring;

the second sealing nail is configured to be clamped in a third cavity formed by the inner wall of the third circular ring; the second seal pin is configured to be insulated from the first seal pin.

6. The fitting structure of claim 5, further comprising an insulator;

the insulating piece is sleeved between the shell and the positive pole post so as to isolate the positive pole post from the shell.

7. The fitting structure of claim 5, further comprising: a negative electrode current collecting plate;

the negative current collecting disc has a negative current collecting disc first surface proximate to the bare cell;

the negative electrode current collecting disc comprises a negative electrode circular ring which is convexly arranged in the axial direction of the axial middle part of the first surface of the negative electrode current collecting disc;

the negative electrode ring is connected with the winding pin hole of the bare cell so as to connect the negative electrode current collecting disc with the bare cell.

8. The fitting structure of claim 7, wherein said fitting structure further comprises: a negative electrode cover plate;

the negative electrode cover plate is provided with a protruding structure protruding towards the negative electrode current collecting disc, and the protruding structure is configured to increase the strength of the joint surface.

9. A cylindrical battery, characterized in that the cylindrical battery comprises: bare cell and mounting structure according to any of claims 1-8.

10. A battery module comprising the cylindrical battery of claim 9.

11. A battery pack, characterized in that the battery pack comprises the battery module according to claim 10.