CN116598670A - Cylindrical battery - Google Patents

Cylindrical battery Download PDF

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Publication number
CN116598670A
CN116598670A CN202310393043.XA CN202310393043A CN116598670A CN 116598670 A CN116598670 A CN 116598670A CN 202310393043 A CN202310393043 A CN 202310393043A CN 116598670 A CN116598670 A CN 116598670A
Authority
CN
China
Prior art keywords
negative electrode
cylindrical battery
opening
explosion
positive electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310393043.XA
Other languages
Chinese (zh)
Inventor
甘强
计进超
程骞
朱冠楠
文哲泽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Xuanyi New Energy Development Co ltd
Original Assignee
Shanghai Xuanyi New Energy Development Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Xuanyi New Energy Development Co ltd filed Critical Shanghai Xuanyi New Energy Development Co ltd
Priority to CN202310393043.XA priority Critical patent/CN116598670A/en
Publication of CN116598670A publication Critical patent/CN116598670A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The present invention provides a cylindrical battery comprising: the shell is internally provided with a containing cavity, and two sides of the containing cavity are respectively provided with a positive electrode opening and a negative electrode opening; the winding core is arranged in the accommodating cavity and comprises a positive electrode end and a negative electrode end, the positive electrode end is close to the positive electrode opening, and the negative electrode end is close to the negative electrode opening; the negative electrode busbar is arranged in the negative electrode opening and is respectively connected with the negative electrode end and the inner wall of the shell; the negative electrode cover plate is arranged at the opening of the negative electrode and is connected with the shell, the negative electrode cover plate comprises two groups of reinforcing areas, a flat area arranged between the two groups of reinforcing areas and an explosion-proof area arranged in the flat area, a reinforcing structure protruding towards the direction deviating from the negative electrode busbar is arranged in the reinforcing area, and a plurality of explosion-proof pieces are arranged in the explosion-proof area. According to the cylindrical battery, the negative electrode cover plate is connected with the inner wall of the shell in a fitting way, so that the connection difficulty is reduced, the transverse space size is reduced, and meanwhile, the number of parts is reduced by arranging the explosion-proof piece on the negative electrode cover plate.

Description

Cylindrical battery
Technical Field
The invention relates to the technical field of new energy, in particular to a cylindrical battery.
Background
The existing cylindrical battery cap structure has more parts, and all parts are matched layer by layer, so that the utilization rate of the internal space of the cylindrical battery is low. Wherein, a plurality of mounting holes need be seted up to the negative pole apron, and the explosion-proof piece sets up in the mounting hole on the negative pole apron as independent part, and the explosion-proof piece can be to the inside protrusion of battery case, has taken the inner space of battery case. In addition, a large number of stop parts are arranged between the negative electrode busbar and the negative electrode cover plate, and the space utilization rate can be reduced due to the large number of stop parts. If no stop part is arranged, the fixing capability of the battery cathode cover plate and the winding core is weak, and the safety and reliability of the product are affected.
Disclosure of Invention
In view of the above, the present invention provides a cylindrical battery capable of effectively improving the space utilization.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an embodiment of the present invention, a cylindrical battery includes: the device comprises a shell, a winding core, a negative electrode busbar and a negative electrode cover plate. Wherein, the housing is internally provided with a containing cavity, and both sides of the containing cavity are respectively provided with a positive electrode opening and a negative electrode opening; the winding core is arranged in the accommodating cavity and comprises a positive electrode end and a negative electrode end, the positive electrode end is close to the positive electrode opening, and the negative electrode end is close to the negative electrode opening; the negative electrode busbar is arranged in the negative electrode opening and is respectively connected with the negative electrode end and the inner wall of the shell; the negative electrode cover plate is arranged at the opening of the negative electrode and is connected with the inner wall of the shell, the negative electrode cover plate is connected with the inner wall of the shell and is attached to the negative electrode busbar, the negative electrode cover plate comprises a reinforcing area and a flat area, an explosion-proof area is arranged in the flat area, a reinforcing structure protruding towards the direction deviating from the negative electrode busbar is arranged in the reinforcing area, and an explosion-proof piece is formed in the explosion-proof area.
According to the cylindrical battery provided by the embodiment of the invention, the negative electrode cover plate is attached to the inner wall of the shell, so that the connection difficulty is reduced, and the transverse space size is reduced. Meanwhile, the reinforcing area and the flat area are arranged on the negative electrode cover plate, the explosion-proof area is arranged in the flat area, and the explosion-proof pieces are arranged in the explosion-proof area, so that the number of parts can be reduced, and the stability of the battery structure is enhanced. In addition, through set up additional strengthening in the enhancement district, can be when installing each part connection, reduce the influence to negative pole apron shape and function, guaranteed explosion-proof piece's stability and reliability.
In one embodiment of the invention, the reinforcing region comprises two groups, wherein the reinforcing structures of the two groups of reinforcing regions respectively protrude towards a first annular boss and a second annular boss which are away from the negative bus bar, and the diameter of the second annular boss is larger than that of the first annular boss.
Through set up convex first annular boss and second annular boss on the negative pole apron, can effectively improve the intensity and the rigidity of negative pole apron, avoid the negative pole apron to take place to warp.
In one embodiment of the invention, the thickness of the rupture disc is less than the thickness of the flat region. That is, the explosion-proof sheet is weaker than the flat area of the negative electrode cover plate, so that the battery can be ensured to form an exhaust channel in time to exhaust gas.
In one embodiment of the invention, the rupture disc is formed in a C-shape, and a plurality of rupture discs are arranged in an annular space.
The explosion-proof sheets are arranged at intervals in a plurality of rings, so that the battery can be ensured to form an exhaust channel in time, explosion is avoided, and the safety is improved.
In one embodiment of the invention, the diameter of the anode cover plate is the same as the diameter of the anode opening of the shell, a welding port which bends towards the direction of the anode bus bar is formed on the periphery of the anode cover plate, a welding connection point is arranged on the cavity wall at the inner side of the anode opening, and the anode cover plate is connected with the welding connection point through the welding port so as to be connected with the inner wall of the shell. .
That is, the welding joint that the negative electrode cover plate upwards buckles to negative electrode busbar direction in circumference is connected after laminating with the welding joint laminating of negative electrode opening inner wall to can effectively reduce the welding degree of difficulty of negative electrode cover plate and casing.
In one embodiment of the invention, the negative cover plate is attached to the negative bus bar.
That is, the negative electrode busbar disposed in the negative electrode opening can position the negative electrode cover plate, and at the same time, the welding opening of the negative electrode cover plate bent inwards can provide support for the negative electrode busbar and the winding core, so that the stop component is eliminated, the number of parts is reduced, and meanwhile, the stability of the structure is increased.
In one embodiment of the present invention, the center of the negative electrode cover plate is provided with a through liquid injection hole, and the cylindrical battery further comprises: a sealing rubber plug and a sealing steel sheet. Wherein, the sealing rubber plug is arranged in the liquid injection hole; the sealing steel sheet cover is arranged on one side of the liquid injection hole, which is away from the negative electrode busbar.
Specifically, the sealing steel sheet is welded above the liquid injection hole. After the sealing rubber plug is placed in the liquid injection hole, the sealing steel sheet is used for sealing the liquid injection hole, so that the sealing performance is effectively improved, and the stability and the reliability of the battery are ensured.
In one embodiment of the invention, the outside of the winding core is wrapped with winding core insulating tape. Therefore, the winding core can be further insulated and sealed, and the safety of the cylindrical battery is effectively improved.
In one embodiment of the invention, the cylindrical battery further comprises: positive electrode bus bar, positive electrode post and positive electrode insulating sheet. The positive electrode busbar is arranged in the positive electrode opening and is connected with the positive electrode end; the positive pole is respectively connected with the positive bus bar and the shell; the positive electrode insulating sheet is arranged between the positive electrode busbar and the positive electrode post.
Specifically, the positive pole post is riveted with the shell, and is welded with the positive busbar, so that the connection is firm, and the stability of the battery can be effectively improved.
The technical scheme of the invention has at least one of the following beneficial effects:
according to the cylindrical battery, the negative electrode cover plate is attached to the inner wall of the shell, so that the connection difficulty is reduced, and the transverse space size is reduced. Meanwhile, the reinforcing area and the flat area are arranged on the negative electrode cover plate, the explosion-proof area is arranged in the flat area, and the explosion-proof piece is arranged in the explosion-proof area, so that the number of parts is reduced, and the stability of the battery structure is enhanced. In addition, through set up additional strengthening in the enhancement district, can be when installing each part connection, reduce the influence to negative pole apron shape and function, guaranteed explosion-proof piece's stability and reliability.
Drawings
Fig. 1 is an exploded view of a cylindrical battery according to an embodiment of the present invention;
fig. 2 is another exploded view of a cylindrical battery according to an embodiment of the present invention;
fig. 3 is an enlarged schematic view of the positive electrode end of the cylindrical battery according to the embodiment of the present invention;
fig. 4 is a cross-sectional view of a negative electrode cap plate of a cylindrical battery according to an embodiment of the present invention.
Reference numerals: 100. a housing; 200. a winding core; 201. winding a core insulating tape; 210. a negative terminal; 300. a negative electrode bus bar; 310. a bending part; 400. a negative electrode cover plate; 410. explosion-proof sheet; 420. a first annular boss; 430. a second annular boss; 440. a welding port; 450. a liquid injection hole; 460. sealing the rubber plug; 470. sealing steel sheet; 500. a positive bus bar; 600. a positive electrode post; 700. and a positive electrode insulating sheet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
In order to facilitate understanding of the technical scheme of the present invention, first, the technical problem to be solved by the present invention will be described.
In some schemes, the cylindrical battery cap has more structural parts, and all parts are matched layer by layer, so that the utilization rate of the internal space of the cylindrical battery is low. Wherein, a plurality of mounting holes need be seted up to the negative pole apron, and the explosion-proof piece sets up in the mounting hole on the negative pole apron as independent part, and the explosion-proof piece can be to the inside protrusion of battery case, has taken the inner space of battery case. Meanwhile, a winding core of an electric core in the cylindrical battery is generally made of flexible materials, the surface of a negative electrode end of the winding core is uneven, a negative electrode bus bar arranged on the upper layer of the winding core is uneven, the thickness of a negative electrode cover plate is 0.2-0.4 mm, and the winding core is easy to deform. For the above reasons, after the anode cover plate and the case are welded, a gap is formed between the anode cover plate and the anode bus bar, and a series of failures such as a contact failure and a short circuit are likely to occur. In addition, a large number of stop parts are arranged between the negative electrode bus bar and the negative electrode cover plate, and the space utilization rate is reduced due to the large number of stop parts. If no stop part is arranged, the fixing capability of the battery cathode cover plate and the winding core is weak, and the safety and reliability of the product are affected.
Based on the technical problems, the invention provides the cylindrical battery, which has the advantages of small number of battery parts, compact structure, stable performance and high safety.
A cylindrical battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is an exploded view of a cylindrical battery according to an embodiment of the present invention. As shown in fig. 1, a cylindrical battery according to an embodiment of the present invention includes: the battery pack includes a case 100, a winding core 200, a negative electrode bus bar 300, and a negative electrode cap 400. Wherein, the housing 100 is provided with a receiving cavity therein, and both sides of the receiving cavity are respectively provided with a positive electrode opening and a negative electrode opening. The winding core 200 is arranged in the accommodating cavity, the winding core 200 comprises a positive electrode end and a negative electrode end 210, the positive electrode end is close to the positive electrode opening, and the negative electrode end 210 is close to the negative electrode opening; the negative electrode busbar 300 is arranged in the negative electrode opening and is respectively welded with the negative electrode end 210 and the inner wall of the shell 100; the negative electrode cover plate 400 is arranged at the opening of the negative electrode and is connected with the inner wall of the shell 100, the negative electrode cover plate 400 comprises a reinforcing area, a flat area and an explosion-proof area, the explosion-proof area is arranged in the flat area, a reinforcing structure protruding towards the direction deviating from the negative electrode busbar 300 is arranged in the reinforcing area, and a plurality of explosion-proof pieces 410 are arranged in the explosion-proof area.
Specifically, in the cylindrical battery provided by the embodiment of the invention, the negative electrode cover plate 400 is attached to the inner wall of the casing 100, so that the welding difficulty is reduced, and the transverse space size is reduced. Meanwhile, by providing the reinforcing region and the flat region on the anode cover plate 400, the explosion-proof region in the flat region directly forms the explosion-proof sheet 410, for example, the thickness of the flat region is thinned by means of chiseling and the like, so that the explosion-proof sheet mounting hole is not required to be provided on the anode cover plate 400. The explosion-proof sheet is not required to be fixed in the explosion-proof sheet mounting hole, so that the number of parts is reduced, and the stability of the battery structure is enhanced. In addition, the reinforcing structure protruding towards the direction away from the negative electrode busbar 300 is arranged in the reinforcing area, so that on one hand, the strength and rigidity of the negative electrode cover plate 400 can be improved, the influence on the shape of the negative electrode cover plate 400 is reduced when the negative electrode cover plate 400 is welded with the inner wall of the shell 100, and the stability and reliability of the explosion-proof piece 410 on the negative electrode cover plate 400 are ensured. On the other hand, since the reinforcing structure protrudes in a direction away from the negative electrode bus bar 300, other portions of the negative electrode cap plate 400 may be recessed so as to be fully contacted with the negative electrode bus bar 300, and thus, occurrence of faults such as poor contact or short circuit may be effectively prevented.
Referring to fig. 2, fig. 2 is another exploded view of a cylindrical battery according to an embodiment of the present invention. In one embodiment of the present invention, the reinforcing region includes two sets, wherein the reinforcing structures of the two sets of reinforcing regions include a first annular boss 420 and a second annular boss 430 protruding in a direction away from the negative bus bar 300, respectively, the second annular boss 430 having a larger diameter than the first annular boss 420.
With further reference to fig. 3, fig. 3 is an enlarged structural schematic diagram of the positive electrode end of the cylindrical battery according to the embodiment of the present invention, by disposing the first annular boss 420 and the second annular boss 430 protruding on the negative electrode cover plate 400, the strength and rigidity of the negative electrode cover plate 400 can be effectively improved, deformation of the negative electrode cover plate 400 is avoided, and when the negative electrode cover plate 400 is welded to the inner wall of the casing 100, the influence on the shape of the negative electrode cover plate 400 is reduced, so that the stability and reliability of the rupture disc 410 on the negative electrode cover plate 400 are ensured. In addition, since the reinforcing structure protrudes in a direction away from the anode bus bar 300, the flat region of the anode cap plate 400 is concave to be in full contact with the anode bus bar 300. After the anode cover 400 is welded to the case 100, the occurrence of failures such as poor contact and short circuit can be effectively avoided.
In one embodiment of the invention, the thickness of the rupture disc 410 is less than the thickness of the flat area. That is, the rupture disc 410 is weaker than the flat area of the negative cover plate. Therefore, when the battery is in fault, the explosion-proof piece 410 can be quickly broken through by gas in the battery, an exhaust channel is formed in time, the gas in the battery is exhausted, explosion is avoided, and the safety is improved.
Further, the explosion-proof sheet 410 may be a score formed by embossing or stamping, and the explosion-proof sheet 410 is disposed on a side of the negative electrode cap 400 facing the negative electrode bus 300.
In some embodiments, the explosion-proof sheet 410 can be directly formed in the explosion-proof area on the negative electrode cover plate 400 through chiseling, so that the explosion-proof sheet mounting holes and the explosion-proof sheet fixing devices are not required to be arranged, the number of parts can be effectively reduced, and the utilization rate of the internal space can be improved. In addition, for rust prevention, an anti-rust coating may be disposed on the outer side of the negative electrode cap plate 400, and if the anti-explosion sheet 410 is chiseled on the outer side, the anti-explosion sheet 410 is easy to rust and corrode after contacting with air, so that potential safety hazards exist. And the explosion-proof piece 410 is chiseled on one side of the negative electrode cover plate 400 facing the negative electrode busbar 300, namely, the inner side of the negative electrode cover plate 400, so that the explosion-proof piece 410 can be prevented from being contacted with air, and further, the explosion-proof piece 410 is prevented from being corroded, and the safety performance is improved while the service life of the explosion-proof piece 410 is prolonged. Referring to fig. 2, in one embodiment of the present invention, the rupture discs 410 are formed in a C-shape, and a plurality of rupture discs 410 are disposed at annular intervals.
That is, the plurality of explosion-proof sheets 410 are arranged in a ring shape at intervals, so that the battery can form enough exhaust channels in time, and the gas is discharged in time, so that explosion is avoided, and the safety is further improved.
Referring to fig. 4, fig. 4 is a schematic structural view of a negative electrode cap plate 400 of a cylindrical battery according to an embodiment of the present invention. In one embodiment of the invention, a plurality of rupture discs 410 are spaced between a first annular boss 420 and a second annular boss 430.
Specifically, the explosion-proof sheet 410 is disposed between the first annular boss 420 and the second annular boss 430 at intervals, so that the force applied to the explosion-proof sheet 410 can be reduced when the first annular boss 420 and the second annular boss 430 are processed, and the stability and reliability of the explosion-proof sheet 410 are ensured. Meanwhile, the explosion-proof sheet 410 is in contact with the negative electrode busbar 300, so that the battery can be ensured to form an exhaust channel in time, explosion is avoided, and safety is improved.
As shown in fig. 3 and 4, in one embodiment of the present invention, the anode cover 400 has the same diameter as the anode opening of the case 100, a welding port 440 bent toward the anode bus bar 300 is formed in the circumference of the anode cover 400, and a welding connection point is provided at the inner cavity wall of the anode opening, and the anode cover 400 is connected to the welding connection point through the welding port to be connected to the inner wall of the case 100. And the negative electrode cap 400 is attached to the negative electrode bus bar 300.
That is, the welding joint 440 bent in the circumferential direction of the anode cover 400 is attached to the welding joint of the inner wall of the anode opening, and the edge of the anode cover 400 does not exceed the opening of the casing 100, so that the welding difficulty of the anode cover 400 and the casing 100 can be effectively reduced. In addition, the anode cover 400 is attached to the anode bus bar 300, and on the one hand, the anode bus bar 300 disposed in the anode opening can position the anode cover 400. On the other hand, the welding hole 440 of the anode cover 400 bent inwards may also laterally limit the anode bus bar 300 and the winding core 200, so as to provide support for the anode bus bar 300 and the winding core 200. Thus, the stop member is eliminated, the number of parts is reduced, and the structural stability is increased. As shown in fig. 3, in one embodiment of the present invention, a bending portion 310 bending in the negative electrode direction of the winding core 200 is formed on the negative electrode bus bar, and the negative electrode bus bar is connected to the inner wall of the case 100 through the bending portion 310. That is, the welding opening 440 bent in the circumferential direction of the negative electrode bus bar 300 is attached to the inner wall of the housing 100, so that the welding difficulty between the negative electrode bus bar 300 and the housing 100 can be effectively reduced.
As shown in fig. 2, in one embodiment of the present invention, the anode cover 400 is provided with a through filling hole 450 at the center, and the cylindrical battery further includes: a sealing rubber plug 460 and a sealing steel sheet 470. Wherein, the sealing rubber plug 460 is arranged in the liquid injection hole 450, and the sealing steel sheet 470 is covered on one side of the liquid injection hole 450 away from the negative electrode busbar 300.
Specifically, after the sealing rubber plug 460 is placed in the liquid injection hole 450, the sealing steel sheet 470 is welded on the sealing liquid injection hole 450 by using laser welding, so that the sealing performance is effectively improved, and the stability and the reliability of the battery are ensured. Meanwhile, the laser welding heat is small, and the deformation amount of the cathode cover plate 400 is small, so that the acting force on the explosion-proof piece 410 on the cathode cover plate 400 is reduced, and the safety and the consistency in exhaust are ensured.
In one embodiment of the invention, the core 200 is surrounded by a core insulating tape 201. Therefore, the winding core 200 can be further insulated and sealed, and the safety of the cylindrical battery is effectively improved. In one embodiment of the invention, the cylindrical battery further comprises: positive electrode bus bar 500, positive electrode column 600, and positive electrode insulating sheet 700. The positive electrode busbar 500 is disposed in the positive electrode opening and connected to the positive electrode terminal. The positive electrode post 600 is connected to the positive electrode bus bar 500 and the case 100, respectively. The positive electrode insulating sheet 700 is disposed between the positive electrode bus bar 500 and the positive electrode post 600.
Specifically, the positive electrode post 600 is riveted with the case 100 while being welded with the positive electrode buss bar 500, and is firmly connected, so that the stability of the battery can be effectively improved.
According to the cylindrical battery, the negative electrode cover plate 400 is attached to the inner wall of the shell 100, so that the connection difficulty is reduced, and the transverse space size is reduced. Meanwhile, the explosion-proof sheet 410 is arranged on the negative electrode cover plate 400, so that the number of parts is reduced, and the stability of the battery structure is enhanced. In addition, by providing the reinforcing structure on the negative electrode cap plate 400, the influence on the shape and function of the negative electrode cap plate 400 can be reduced when the parts are connected and mounted, and the stability and reliability of the explosion-proof sheet 410 are ensured.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.

Claims (10)

1. A cylindrical battery, comprising:
the shell is internally provided with a containing cavity, and two sides of the containing cavity are respectively provided with an anode opening and a cathode opening;
the winding core is arranged in the accommodating cavity and comprises a positive electrode end and a negative electrode end, the positive electrode end is close to the positive electrode opening, and the negative electrode end is close to the negative electrode opening;
the negative electrode busbar is arranged in the negative electrode opening and is respectively connected with the negative electrode end and the inner wall of the shell;
the negative electrode cover plate is arranged at the opening of the negative electrode, the negative electrode cover plate is connected with the inner wall of the shell and attached to the negative electrode busbar, the negative electrode cover plate comprises a reinforcing area and a flat area, an explosion-proof area is arranged in the flat area, a reinforcing structure protruding towards the direction away from the negative electrode busbar is arranged in the reinforcing area, and an explosion-proof piece is formed in the explosion-proof area.
2. The cylindrical battery of claim 1, wherein the reinforcing regions comprise two sets, wherein the reinforcing structures of the two sets of reinforcing regions are first and second annular bosses protruding away from the negative bus bar, respectively, the second annular boss having a diameter greater than the first annular boss.
3. The cylindrical battery of claim 1, wherein the rupture disc has a thickness less than the thickness of the flat region.
4. The cylindrical battery of claim 3, wherein the rupture disc is formed in a C-shape.
5. The cylindrical battery of claim 4, wherein a plurality of said rupture discs are provided, and a plurality of said rupture discs are spaced apart and are annularly disposed about.
6. The cylindrical battery of claim 1, wherein the anode cap plate diameter is the same as the anode opening diameter of the housing.
7. The cylindrical battery according to claim 6, wherein a welding port is formed in the circumferential direction of the negative electrode cap plate so as to be bent in the negative electrode bus bar direction, a welding connection point is provided on the inner cavity wall of the negative electrode opening, and the negative electrode cap plate is connected to the welding connection point through the welding port so as to be connected to the inner wall of the case.
8. The cylindrical battery of claim 2, wherein the negative cap plate is centrally provided with a through-going liquid injection hole, the cylindrical battery further comprising:
the sealing rubber plug is arranged in the liquid injection hole;
and the sealing steel sheet is covered on one side of the liquid injection hole, which is away from the negative electrode busbar.
9. The cylindrical battery of claim 1, wherein the winding core is surrounded by a winding core insulating tape.
10. The cylindrical battery of claim 1, further comprising:
the positive electrode busbar is arranged in the positive electrode opening and is connected with the positive electrode end;
the positive pole is respectively connected with the positive bus bar and the shell;
and the positive electrode insulating sheet is arranged between the positive electrode busbar and the positive electrode post.
CN202310393043.XA 2023-04-13 2023-04-13 Cylindrical battery Pending CN116598670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310393043.XA CN116598670A (en) 2023-04-13 2023-04-13 Cylindrical battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310393043.XA CN116598670A (en) 2023-04-13 2023-04-13 Cylindrical battery

Publications (1)

Publication Number Publication Date
CN116598670A true CN116598670A (en) 2023-08-15

Family

ID=87592685

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310393043.XA Pending CN116598670A (en) 2023-04-13 2023-04-13 Cylindrical battery

Country Status (1)

Country Link
CN (1) CN116598670A (en)

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