CN114944531B - Cylindrical battery cover plate assembly, battery and preparation method - Google Patents
Cylindrical battery cover plate assembly, battery and preparation method Download PDFInfo
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- CN114944531B CN114944531B CN202210861360.5A CN202210861360A CN114944531B CN 114944531 B CN114944531 B CN 114944531B CN 202210861360 A CN202210861360 A CN 202210861360A CN 114944531 B CN114944531 B CN 114944531B
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- 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
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- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
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- 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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
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- 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
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- 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
- H01M50/543—Terminals
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a cylindrical battery cover plate component, a battery and a preparation method, and relates to the field of lithium batteries, wherein a sealing ring is arranged to seal a cover plate and a joint, and the cover plate, a pole and a plastic part are fixed together by being matched with the plastic part for integral injection molding, so that the sealing performance of the sealing ring is good, and the assembly process is simple; in addition, the cover plate adopting the process only needs to be welded and sealed with the cylindrical shell, and after the welding is finished, the pole is insulated from the shell; thirdly, the cover plate adopting the process can ensure the sealing performance and thin the pole, so that the pole and the current collecting disc can be conveniently welded from the outside of the battery, and the design of the bent piece of the current collecting disc is omitted; the middle part of the pole column protrudes upwards relative to the edge part of the pole column, so that the welding position of the middle part of the pole column and the first current collecting disc is far away from the winding core.
Description
Technical Field
The invention relates to the technical field of cylindrical batteries, in particular to a cylindrical battery cover plate assembly, a battery and a preparation method.
Background
With the rapid development of lithium ion battery technology, the lithium battery has the characteristics of high capacity and high safety, and is widely applied to the fields of automobiles, aerospace, consumer electronics and the like.
Lithium batteries are now roughly divided into three directions: pouch batteries, square batteries, and cylindrical batteries. With the release of 4680 batteries, the cylindrical batteries were again successfully pushed to another height. Patent CN213401445U discloses a common large cylindrical aluminum-shell battery structure, which adopts a structure that positive and negative electrodes are symmetrically arranged at two ends of a cylindrical shell respectively, two positive poles or two negative poles are arranged at the inner side and the outer side of a cover plate respectively, an insulating pad is arranged between the two positive poles or the two negative poles and the cover plate respectively, the cover plate and two poles at two sides of the cover plate are fixed through rivets, and finally the cover plate and the cylindrical shell are welded and sealed. The structure is very complicated, the space utilization rate in the height direction is low, the battery is also very unstable in the long-term use process, the pole is easy to loosen and even fall off, and the battery is easily broken or even explodes.
Patent CN112151732a discloses a circular lithium battery and a method for manufacturing the same, which directly omits a pole, and uses a positive cover plate to replace the pole, meanwhile, the positive cover plate is partially embedded in a sealing body and integrally cast and molded, and finally, the sealing body and an opening of a cylindrical shell are sealed and fixed. Compared with the prior art, the process for sealing the opening of the sealing body and the cylindrical shell has the advantages that the process complexity is high and the sealing reliability is lower due to the fact that the cover plate and the opening of the cylindrical shell are directly welded. Therefore, it is necessary to improve it.
In a pouring molding process, patent CN216085075U discloses a common square hard-shell lithium ion battery post cover plate assembly, which forms a plastic part on the cover plate, and the plastic part and the cover plate and the post form a mortise and tenon structure, respectively, so as to fix the cover plate and the post together and seal the space between the cover plate and the post by matching with a sealing ring. However, above structure is used for square hard shell lithium ion, and to cylinder type lithium ion battery, its volume is less, and the utmost point post of thickness will reduce energy density more importantly because utmost point post is thicker, can't be welded through, can only current welding mode: firstly, the current collecting disc and the pole are welded from one side of the current collecting disc, and the current collecting disc is welded with the flat-rolled end face of the foil on the winding core in advance, so that the bending piece is required to be led out from the current collecting disc and is used for being welded with the pole and then bent. The arrangement of the bending piece of the current collecting disc makes the structure complicated, occupies the internal space and is easy to cause short circuit.
Therefore, it is necessary to improve the sealing structure of the existing cylindrical battery cover plate and the pole to prevent the pole from loosening and falling off during the long-term use of the battery.
Disclosure of Invention
In view of this, the invention provides a cylindrical battery cover plate assembly, a battery and a preparation method thereof.
The technical scheme of the invention is realized as follows:
in one aspect, the present invention provides a cylindrical battery cover plate assembly, which comprises a cover plate and a pole, wherein,
the surface of the cover plate is provided with a first through hole;
the pole comprises a continuous pole middle part and a continuous pole edge part, wherein the pole edge part is arranged around the pole middle part; the middle part of the pole is arranged right opposite to the first through hole, and the edge part of the pole is arranged below the cover plate;
also comprises a sealing ring and a plastic rubber piece, wherein,
the sealing ring is arranged between the edge part of the pole and the cover plate;
the plastic part is filled between the lower surface of the cover plate, the sealing ring and the pole continuously, the cover plate, the pole and the plastic part are fixed through integrated injection molding, and part of the plastic part extends to the position below the lowest height of the cover plate.
On the basis of the technical scheme, preferably, the plastic part is continuously filled among the lower surface of the cover plate, the sealing ring and the pole, and part of the plastic part extends to a position below the lowest height of the cover plate.
On the basis of the above technical scheme, preferably, the cover plate comprises a cover plate body and a second limiting part, and the second limiting part is arranged on the lower surface of the cover plate body; the pole is provided with a fifth limiting part, and the plastic part is continuously filled on the surfaces of the second limiting part and the fifth limiting part.
Preferably, the second limiting part is annular and encloses with the bottom surface of the cover plate body to form a first counter bore, the size of the opening of the first counter bore is smaller than that of the bottom of the first counter bore, and the plastic part is filled in the first counter bore.
Further preferably, the first counter bore and the first through hole are coaxially arranged, and the distance between the edge of the bottom of the first counter bore and the edge of the outer ring of the sealing ring is 3-7mm.
Preferably, the periphery of the edge portion of the pole is a fifth limiting portion, and the fifth limiting portion is inserted into the plastic part and is injection molded with the plastic part.
On the basis of the above technical scheme, it is preferred that the apron includes apron body and first spacing portion, seted up first through-hole on the apron body, the apron body is close to first through-hole edge downwardly extending and forms first spacing portion, and the sealing washer sets up between apron body and utmost point post edge portion and supports with first spacing portion counterbalance.
On the basis of the technical scheme, preferably, the plastic part is continuously filled between the upper surface of the cover plate, the sealing ring and the pole.
Further preferably, a third limiting portion is arranged on the middle portion of the pole, a fourth limiting portion is arranged on the cover plate, and the plastic part is continuously filled in the surfaces of the third limiting portion and the fourth limiting portion.
Preferably, the plastic part comprises an upper plastic part and a lower plastic part which are separated from each other, the upper plastic part is continuously filled between the upper surface of the cover plate, the sealing ring and the pole, and the lower plastic part is filled on the lower surface of the cover plate.
In a second aspect, the present invention provides a cylindrical battery, which comprises a cylindrical casing, wherein at least one end of the cylindrical casing is open, the cylindrical battery comprises the cylindrical battery cover plate assembly according to the first aspect of the present invention, and a cover plate is arranged at least one opening of the cylindrical casing and is welded and sealed with the opening.
On above technical scheme's basis, preferred, it includes rolls up core and first current collector dish, roll up core one end and include a plurality of rings of anodal foil, the other end includes a plurality of rings of negative pole foil, the foil terminal surface is rubbed flatly, and first current collector dish bottom surface supports with the foil terminal surface and holds and weld, first current collector dish and utmost point post electric connection.
Preferably, the upper end and the lower end of the plastic part are respectively abutted against the bottom surface of the cover plate and the upper surface of the first collecting plate.
Preferably, the upper surface of the first current collecting disc and the bottom surface of the middle part of the pole support against each other and are welded and fixed from the outer side of the battery.
More preferably, the thickness of the pole intermediate part is 0.5 to 0.8mm.
Still further preferably, the utmost point post intermediate part is upwards protruding for utmost point post edge portion, and utmost point post intermediate part bottom forms open cavity, and first current collecting disc stretches into utmost point post intermediate part bottom cavity and supports each other, welds.
Preferably, the battery comprises a continuous current collecting disc middle part and a continuous current collecting disc edge part, wherein the current collecting disc edge part is formed by horizontally extending the current collecting disc middle part and is abutted to and welded with the foil end face, the current collecting disc middle part is upwards protruded relative to the current collecting disc edge part, the plastic part is provided with a second through hole, the second through hole is arranged right opposite to the first through hole, the current collecting disc middle part penetrates through the second through hole, the upper surface of the current collecting disc middle part is abutted to the bottom surface of the pole, and the current collecting disc middle part is welded and fixed with the pole from the outer side of the battery.
Still further preferably, the upper surface of the first current collecting disc and the bottom surface of the middle part of the pole are in tight fit.
Preferably, the cylindrical shell has an opening at one end and a bottom plate at the other end, and further comprises a second current collecting disc, wherein the upper surface and the lower surface of the second current collecting disc are respectively abutted against and welded with the end face of the foil and the inner surface of the bottom plate of the cylindrical shell.
In a third aspect, the invention provides a method for preparing the cylindrical battery cover plate assembly of the first aspect of the invention, comprising the following steps of arranging the cover plate, the sealing ring and the pole in a position relationship and placing the cover plate, the sealing ring and the pole into a cavity of an injection mold, wherein the surface of one side of the cover plate to be subjected to injection molding faces upwards; closing the mold, wherein the injection mold presses the pole, and the pole compresses the sealing ring under the action of pressure; and finally, performing integral injection molding to obtain the plastic part.
Compared with the prior art, the cylindrical battery cover plate component, the battery and the preparation method have the following beneficial effects:
(1) The sealing ring is arranged, so that the cover plate and the connecting part are sealed, the plastic part is matched for integral injection molding, the cover plate, the pole and the plastic part are fixed together, the sealing performance of the sealing ring is good, and the assembly process is simple; in addition, the cover plate adopting the process only needs to be welded and sealed with the cylindrical shell, and after the welding is finished, the pole is insulated from the shell; thirdly, the cover plate adopting the process can ensure the sealing performance and thin the pole, so that the pole and the current collecting disc can be conveniently welded from the outside of the battery, and the design of the bent piece of the current collecting disc is omitted;
(2) The invention provides two key plastic part structures, one is arranged on the lower surface of a cover plate, part of the plastic part extends to the position below the lowest height of the cover plate, a current collecting disc and the cover plate are isolated, the insulating effect is achieved, the plastic part is formed in a one-step injection molding mode, and the obtained plastic part simultaneously achieves the fixing and insulating effects; the other type of the pole-fixing device is arranged on the upper surface of the cover plate, and the pole-fixing device has the advantages that the strength of the pole-fixing part is high, the pole-fixing part can also play a role in fixing, but a lower plastic part is additionally arranged to isolate the current-collecting disc and the cover plate, and two times of injection molding are needed;
(3) The middle part of the pole is upwards protruded relative to the edge part of the pole, so that the welding position of the middle part of the pole and the first current collecting disc is far away from the winding core, and the welding position adopts continuous laser welding, so that the heat productivity is relatively large, and the heat accumulation can be prevented from damaging the isolation film;
(4) The upper surface of the first current collecting disc and the bottom surface of the middle part of the pole are in tight fit, and a cover plate cannot be covered and welded on the premise that the first current collecting disc and the bottom surface of the middle part of the pole are not tightly pressed, so that insufficient welding can be prevented;
(5) One end of the cylindrical battery adopts the improved cover plate component, and the pole column is insulated with the cylindrical shell; the other end of the cylindrical shell can adopt a simple design, and the current collecting disc is welded with the cylindrical shell and electrically connected with the cylindrical shell, so that the cylindrical shell is electrified, a pole column and a cover plate are omitted, the cost is low, and the assembly efficiency is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a perspective view of a cylindrical battery of example 2;
fig. 2 is a plan view of a cylindrical battery of example 2;
FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is an enlarged view of the oval area in FIG. 3;
FIG. 5 is a perspective view of a cover plate in example 1;
fig. 6 is a perspective view of a pole in example 1;
FIG. 7 is a perspective view of a plastic part according to embodiment 1;
fig. 8 is a perspective view of a first catch plate in embodiment 1;
fig. 9 is a perspective view of a second catch plate in embodiment 1;
fig. 10 is a front sectional view of the cylinder type battery cover plate assembly of example 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1~4, the cylindrical battery cover plate assembly of the present invention includes a cover plate 1, a post 2, a sealing ring 4 and a plastic component 5. The cylindrical battery of the invention also comprises a cylindrical shell 6, a winding core 7, a first current collecting disc 8 and a second current collecting disc 9.
As shown in fig. 5, the cover plate 1 is generally made of a metal conductive material, so that the cover plate is convenient to weld and has the advantage of high strength. Specifically, the cover plate 1 is provided with a liquid injection hole 105 for injecting electrolyte. Specifically, the cover plate 1 is provided with an explosion-proof valve hole 104 for placing the explosion-proof valve A1. Specifically, the explosion-proof valve comprises an explosion-proof valve sticking film A2 which is stuck to the surface of the explosion-proof valve hole 104 and protects the explosion-proof valve A1 from being damaged by external force.
The opening of the cover plate 1 and the cylindrical shell 6 is generally welded in a sealing mode, the process is simple, and the sealing is firm. However, as described in the background section of the present invention, if the cover plate 1 is welded to the cylindrical housing 6 in a sealed manner, the cover plate 1 is electrically connected to the cylindrical housing 6, and thus at least one of the positive and negative poles 2 must be insulated from the cover plate 1. In order to achieve the insulation effect, the cover plate 1 is separated from the pole 2, a hole is formed in the cover plate 1, and the pole 2 penetrates through the hole in the cover plate and is sealed.
Specifically, the surface of the cover plate 1 is provided with a first through hole 101 for mounting the pole 2.
As shown in fig. 6, the pole 2 includes a continuous pole middle portion 21 and a pole edge portion 22, wherein: the pole edge part 22 is arranged around the pole middle part 21, the pole edge part 22 is arranged below the cover plate 1, and the pole edge part 22 and the cover plate 1 jointly compress the sealing ring 4 to prevent liquid leakage; the pole edge part 22 can also be used for clamping and fixing with the plastic part 5; the pole intermediate portion 21 is disposed facing the first through hole 101, electrically connected to the winding core 7 internally, and serves as an electrode lead-out terminal externally. As the name implies, the pole edge portion 22 is arranged around the pole intermediate portion 21, preferably, the pole edge portion 22 may be arranged in a ring shape to support the sealing ring 4 against leakage. Preferably, the pole edge portion 22 or the pole middle portion 21 may be provided with some grooves or protrusions for limiting horizontal rotation thereof, so as to cooperate with the plastic part 5 to prevent the pole 2 from rotating in a horizontal plane.
And a seal ring 4 disposed between the pole edge portion 22 and the cover plate 1. On one hand, the insulating function can be achieved, and the electric contact between the pole edge part 22 and the cover plate 1 is prevented; on the other hand, the sealing function can be achieved.
As shown in fig. 7, the plastic part 5 is continuously filled between the cover plate 1, the sealing ring 4 and the post 2, and the cover plate 1, the post 2 and the plastic part 5 are fixed by integral injection molding. So, can fix fast and assemble apron 1, utmost point post 2 and sealing washer 4, need not screw connection or welding, with low costs, and sealing washer 4's sealed effect is fine.
The plastic part 5 is filled on the upper surface or the lower surface of the cover plate 1, and can play a role in quick fixation, the embodiment adopts a mode that the plastic part 5 is filled on the lower surface of the cover plate 1, and the embodiment 3 adopts a mode that the plastic part 5 is filled on the upper surface of the cover plate 1.
Specifically, the plastic part 5 is continuously filled between the lower surface of the cover plate 1, the sealing ring 4 and the pole 2, and part of the plastic part 5 extends to a position below the lowest height of the cover plate 1. So, through once injection moulding, the plastic part 5 that obtains extends to apron 1 below the minimum height to can keep apart apron 1 and roll core 7, prevent that apron 1 from touchhing the utmost point ear or the current collection dish on rolling up core 7, lead to the short circuit. Preferably, the plastic member 5 covers the bottom surface of the cover plate 1 as full as possible to prevent short circuit caused by erroneous contact or deformation due to pressing.
After the injection molding of the plastic part 5, a structure similar to a mortise and tenon joint is required to be formed between the plastic part and the cover plate 1 and the pole 2, so that the fixing effect is achieved. Specifically, the cover plate 1 includes a cover plate body 11 and a second limiting portion 13, and the second limiting portion 13 is disposed on the lower surface of the cover plate body 11; the pole column 2 is provided with a fifth limiting part 220, and the plastic part 5 is continuously filled on the surfaces of the second limiting part 13 and the fifth limiting part 220. Specifically, the second limiting part 13 provides an upward limiting support for the plastic part 5, and prevents the plastic part and the lower surface of the cover plate 1 from moving up and down relatively; the second limiting part 13 also provides limiting support for the plastic part 5 in the horizontal direction, and prevents relative displacement between the plastic part and the plastic part in the horizontal plane.
The second limiting part 13 can be designed into any shape, and only needs to be matched with the lower surface of the cover plate body 11 to limit the plastic part 5. Specifically, as an optional implementation manner of the second limiting portion 13, the second limiting portion 13 is annular and surrounds the bottom surface of the cover plate body 11 to form a first counter bore 102, the size of an opening of the first counter bore 102 is smaller than that of the bottom, and the plastic part 5 is filled in the first counter bore 102. The first counter bore 102 designed into a conical structure is more balanced in stress in the horizontal direction, and the anti-falling effect is better. Specifically, the first counterbore 102 and the first through hole 101 are coaxially arranged, so that when the pole 2 in the first through hole 101 is subjected to a force in the vertical direction, the plastic part 5 in the first counterbore 102 can provide an equal supporting force to the pole in each direction, and the stress strength of the whole body in the vertical direction is improved. The bottom edge of the first counterbore 102 can be far away from the pole 2 and can also be close to the pole 2, and considering that the stress strength of the plastic part 5 is limited, if the design that the bottom edge of the first counterbore 102 is far away from the pole 2 is adopted, the sealing performance of the contact surface between the first counterbore 102 and the plastic part 5 is poor when the pole 2 is stressed vertically downwards, therefore, the bottom edge of the first counterbore 102 is close to the pole 2, and particularly, the distance between the bottom edge of the first counterbore 102 and the outer ring edge of the sealing ring 4 is 3 to 7mm.
The fifth limiting part 220 can be designed into any shape, and only needs to be matched with the plastic part 5, so that the mutual limiting of the pole 2 and the plastic part 5 is realized. Specifically, the periphery of the pole edge portion 22 is the fifth limiting portion 220, and the fifth limiting portion 220 is inserted into the plastic part 5 and is injection molded integrally therewith.
In order to prevent the sealing ring 4 from being disengaged, the cover plate 1 includes a cover plate body 11 and a first limiting portion 12, a first through hole 101 has been opened on the cover plate body 11, the cover plate body 11 is close to the first through hole 101 and extends downwards to form the first limiting portion 12, and the sealing ring 4 is disposed between the cover plate body 11 and the pole edge portion 22 and is abutted against the first limiting portion 12. Specifically, for the design that the plastic part 5 is disposed on the lower surface of the cover plate body 11 in this embodiment, the first limiting portion 12 and the inner ring surface of the sealing ring 4 abut against each other; for the design of the embodiment 3 in which the plastic part 5 is disposed on the upper surface of the cover plate body 11, the first limiting portion 12 and the outer ring surface of the sealing ring 4 are abutted against each other.
The following describes a method for manufacturing a cylindrical battery cover plate assembly according to the present embodiment, including the following steps:
firstly, placing a cover plate 1, a sealing ring 4 and an electrode post 2 in a position relation and placing the cover plate, the sealing ring 4 and the electrode post 2 into a cavity of an injection mold, wherein the surface of one side of the cover plate 1 to be subjected to injection molding faces upwards, and the sealing ring 4 is nested outside a first limiting part 12 and the end surface of the sealing ring is tightly attached to an edge part 22 of the electrode post;
the mold is closed, the injection mold presses the pole 2, and the pole 2 compresses the sealing ring 4 under the action of pressure to achieve the sealing effect;
and finally, pouring hot-melt injection molding slurry to enable the injection molding slurry to flow over the surface of the cover plate 1 with the lowest height (namely, the highest height with the bottom surface upward), and cooling and molding to obtain the plastic part 5.
Example 2
The following describes the cylindrical battery of the present embodiment, using the cylindrical battery cover plate assembly of embodiment 1 of the present invention.
The cylindrical shell 6 is generally made of metal conductive materials, is convenient to weld and has the advantage of high strength. At least one end of the cover plate is opened and is used for being plugged into the winding core 7, and the cover plate 1 is arranged at least one opening of the cylindrical shell 6 and is welded and sealed with the cylindrical shell. Specifically, the cylindrical housing 6 may be designed to have two open ends, and this design is usually applied to a battery having its positive and negative electrodes insulated from the cylindrical housing 6; in this embodiment, the cylindrical housing 6 is designed to be a cylindrical structure with an open end and a bottom plate at the other end, that is, the cylindrical housing 6 is electrically connected to one of the positive electrode and the negative electrode and is insulated from the other.
The cylindrical battery cover plate component in embodiment 1 of the invention can be matched with a single-pole lug, a multi-pole lug or a full-pole lug winding core, and because the mainstream design of the conventional power battery is the multi-pole lug, the multi-pole lug winding core is adopted in the embodiment for description.
Specifically, roll up core 7 one end and include a plurality of circles of anodal foil, the other end includes a plurality of circles of negative pole foil, the foil terminal surface is rubbed flatly. The above is the prior art of the full-tab cylindrical battery, and is not described herein again.
As shown in fig. 8, the bottom surface of the first current collecting plate 8 abuts against and is welded to the end surface of the foil, and is electrically connected to the pole 2. Specifically, the first current collecting plate 8 may be a conventional current collecting plate with a bent piece, but as a preferred embodiment, the upper surface of the first current collecting plate 8 and the bottom surface of the pole intermediate portion 21 are abutted against each other and welded and fixed from the outside of the battery. Therefore, the first current collecting plate 8 can be welded from the outside of the battery, and compared with a mode of welding from the inside of the battery, the first current collecting plate 8 does not need to be provided with a bending piece, so that materials and processes are saved, the occupation of the bending piece in the height direction can be reduced, and the energy density of the battery is higher.
Because the pole middle part 21 and the first current collecting disc 8 need to be welded from the outside, the pole middle part 21 cannot be too thick, otherwise, the pole middle part cannot be welded through, and the thickness of the pole middle part 21 is preferably 0.5-0.8mm.
Compared with the first current collecting plate 8 and the end face of the foil material, the laser pulse welding method is generally adopted, and the heating amount in a short time is relatively small. Generally, the pole intermediate portion 21 and the first current collecting plate 8 need to be continuously welded by laser, and the separator inside the winding core 7 is easily damaged due to a large amount of heat generated in a short time. Therefore, as a preferred embodiment, the pole middle portion 21 protrudes upward relative to the pole edge portion 22, the bottom of the pole middle portion 21 forms an open cavity, and the first current collecting plate 8 extends into the cavity at the bottom of the pole middle portion 21 and abuts against and is welded to each other. Thus, the pole intermediate portion 21 protruding upward is away from the winding core 7, and the isolation film inside the winding core 7 is prevented from being damaged in the welding process.
Based on the same consideration, the first current collecting plate 8 is preferably configured to be an upward-protruding structure, specifically, the first current collecting plate 8 includes a continuous current collecting plate middle portion 81 and a current collecting plate edge portion 82, the current collecting plate edge portion 82 is formed by horizontally extending the current collecting plate middle portion 81 and abuts against and is welded to the end face of the foil, the current collecting plate middle portion 81 protrudes upward relative to the current collecting plate edge portion 82, the plastic part 5 is provided with a second through hole 502, the second through hole 502 is disposed opposite to the first through hole 101, the current collecting plate middle portion 81 penetrates through the second through hole 502, the upper surface abuts against the bottom face of the pole post 2, and the current collecting plate middle portion 81 and the pole post 2 are welded and fixed from the outside of the battery. In this way, the separator inside the winding core 7 is prevented from being damaged in the process of welding the current collecting plate intermediate portion 81 and the pole intermediate portion 21.
Specifically, the upper part of the pole middle part 21 is a flat plate, the side part is annular or hollow round table-shaped, and the pole edge part 22 is annular, so that the structure is convenient to mold. Specifically, the collecting plate middle part 81 can also adopt the same structure as the pole middle part 21, so as to be nested together and welded conveniently.
Since the current collecting plate intermediate part 81 and the post intermediate part 21 are welded to each other on the outside, a cold joint is likely to occur because no welding surface can be observed, and as a preferred embodiment, the upper surface of the first current collecting plate 8 and the bottom surface of the post intermediate part 21 are tightly fitted to each other. Specifically, after the cover plate 1 is covered, the cover plate 1 and the cylindrical shell 6 can be welded only when the middle part 81 of the current collecting plate and the middle part 21 of the pole are tightly pressed; otherwise, the cover plate 1 and the cylindrical housing 6 cannot be assembled. Therefore, the current collecting plate middle part 81 and the pole post middle part 21 can be tightly pressed, welding is performed on the basis, the probability of insufficient welding can be reduced, and the yield is improved.
Considering that insulation treatment is needed between the first collecting tray 8 and the cover plate 1, the upper end and the lower end of a part of the plastic part 5 are respectively propped against the bottom surface of the cover plate 1 and the upper surface of the first collecting tray 8. Specifically, the plastic member 5 covers the bottom surface of the cover plate 1 as full as possible to prevent short circuit caused by erroneous contact or extrusion deformation.
The positive and negative electrodes of the cylindrical battery of the present invention may be the cylindrical battery cover plate assembly of embodiment 1 of the present invention.
However, in view of a simpler, low-cost, and high-energy-density structure, the present embodiment preferably employs the following structure:
as shown in fig. 9, one end of the cylindrical shell 6 is open, the other end is a bottom plate, and the cylindrical shell further comprises a second current collecting plate 9, wherein the upper surface and the lower surface of the second current collecting plate 9 are respectively abutted against and welded with the end face of the foil and the inner surface of the bottom plate of the cylindrical shell 6.
Thus, the foil corresponding to the second current collecting plate 9 is directly electrically connected to the cylindrical housing 6, so that the housing is charged.
Specifically, one end of the cylindrical battery cover plate assembly in embodiment 1 of the present invention is a battery cathode, the end corresponding to the second current collecting plate 9 is a battery anode, and the cylindrical casing 6 is positively charged.
The assembly steps of the cylindrical battery of the present embodiment are described below:
the wound winding core 7 is welded with a first current collecting disc 8 and a second current collecting disc 9 respectively;
welding an assembly body of the collecting plate and a 106 cylindrical shell 6, welding a bottom plate of the cylindrical shell 6 of a second collecting plate 9, covering a cover plate 1 at an opening of the cylindrical shell 6, pressing, welding and sealing;
after the welding is completed, the terminal intermediate portion 21 is welded and fixed to the first current collecting plate 8 on the outside of the battery.
Example 3
This embodiment is substantially the same as embodiment 1 except that: the plastic part 5 is continuously filled between the upper surface of the cover plate 1, the sealing ring 4 and the pole 2.
After the injection molding of the plastic part 5, a structure similar to a mortise and tenon joint is required to be formed between the plastic part and the cover plate 1 and the pole 2, so that the fixing effect is achieved. Specifically, a third limiting portion 210 is arranged on the pole intermediate portion 21, a fourth limiting portion 103 is arranged on the cover plate 1, and the plastic part 5 is continuously filled on the surfaces of the third limiting portion 210 and the fourth limiting portion 103.
Specifically, the fourth limiting portion 103 may be a protruding ring or a ring groove that is provided on the surface of the cover plate 1 and coaxial with the post 2, and the cover plate 1 may be limited to move in the horizontal plane relative to the plastic part 5 by filling the plastic part 5 on the surface of the fourth limiting portion 103.
Specifically, the third limiting portion 210 may be a raised ring or a ring groove formed on the middle portion 21 of the pole, and the plastic member 5 is filled on the surface of the third limiting portion 210, so that the cover plate 1 can be limited from moving in a horizontal plane relative to the plastic member 5. The third limiting part 210 and the fourth limiting part 103 act together to prevent the plastic part 5 from moving in the vertical direction relative to the cover plate 1 and the pole 2, so that the three parts are fixed together.
Specifically, in order to prevent the rotation of the plastic part 5, a rotation-preventing groove may be formed on the surface of the cover plate 1 or the surface of the pole 2, and after the plastic part 5 is filled, the plastic part, the cover plate and the pole can be prevented from rotating in a horizontal plane.
In this embodiment, in order to facilitate filling the plastic part 5 and prevent the sealing ring 4 from falling off, the first limiting portion 12 and the outer circumferential surface of the sealing ring 4 abut against each other.
Considering that insulation treatment is needed between the cover plate 1 and the winding core 7, the cover plate 1 is prevented from touching a lug or a current collecting disc on the winding core 7 to cause short circuit. The plastic part 5 of this embodiment includes the last plastic part 51 and the lower plastic part 52 of alternate segregation, goes up plastic part 51 and fills in between apron 1 upper surface, sealing washer 4 and utmost point post 2 in succession, and lower plastic part 52 fills in apron 1 lower surface. Thus, the plastic part 5 is formed by injection molding twice, and the upper plastic part 51 can play a role in sealing and fixing the cover plate 1, the sealing ring 4 and the pole 2; the lower plastic part 52 may serve to separate the cover plate 1 from the reeling core 7.
The following describes a method for manufacturing a cylindrical battery cover plate assembly according to the present embodiment, including the following steps:
the upper plastic part 51 is molded first.
Firstly, placing a cover plate 1, a sealing ring 4 and a pole 2 in a position relation and placing the cover plate, the sealing ring 4 and the pole 2 into a cavity of an injection mold, wherein the upper surface of the cover plate 1 faces upwards, the sealing ring 4 is placed in a first limiting part 12, and the end surface of the sealing ring is attached to the edge part 22 of the pole;
closing the mold, wherein the injection mold supports the pole 2 from the bottom, and meanwhile, the injection mold presses the cover plate 1, and the cover plate 1 compresses the sealing ring 4 under the action of pressure to achieve the sealing effect;
finally, the hot-melt injection molding slurry is poured and cooled to form the upper plastic part 51.
The lower plastic portion 52 is then molded.
The bottom surface of the cover plate 1 faces upwards and is placed into a cavity of an injection mold, hot-melt injection molding slurry is poured in so that the injection molding slurry flows over the surface of the cover plate 1 with the lowest height (namely, the highest height after the bottom surface faces upwards), and the lower plastic part 52 is obtained through cooling and molding.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (18)
1. A cylindrical battery comprises a roll core (7) and a first current collecting disc (8), wherein one end of the roll core (7) comprises a plurality of circles of anode foils, the other end of the roll core comprises a plurality of circles of cathode foils, the end face of each foil is rubbed flat, and the bottom face of the first current collecting disc (8) is abutted to and welded with the end face of each foil; also comprises a cylindrical battery cover plate component which comprises a cover plate (1) and a pole (2), wherein,
the cover plate (1) is provided with a first through hole (101) on the surface;
the pole (2) comprises a continuous pole middle part (21) and a pole edge part (22), and the pole edge part (22) is arranged around the pole middle part (21); the middle part (21) of the pole is arranged right opposite to the first through hole (101), and the edge part (22) of the pole is arranged below the cover plate (1);
the method is characterized in that: also comprises a sealing ring (4) and a plastic part (5), wherein,
the sealing ring (4) is arranged between the edge part (22) of the pole and the cover plate (1);
the plastic part (5) is continuously filled among the cover plate (1), the sealing ring (4) and the pole (2), and the cover plate (1), the pole (2) and the plastic part (5) are fixed through integral injection molding;
the upper surface of the first current collecting disc (8) and the bottom surface of the middle part (21) of the pole support against each other and are welded and fixed from the outer side of the battery.
2. The cylindrical battery as defined in claim 1, wherein: the plastic part (5) is continuously filled among the lower surface of the cover plate (1), the sealing ring (4) and the pole (2), and part of the plastic part (5) extends to a position below the lowest height of the cover plate (1).
3. The cylindrical battery as defined in claim 2, wherein: the cover plate (1) comprises a cover plate body (11) and a second limiting part (13), wherein the second limiting part (13) is arranged on the lower surface of the cover plate body (11); be provided with spacing portion of fifth (220) on utmost point post (2), plastic part (5) are filled in spacing portion of second (13) and spacing portion of fifth (220) surface in succession.
4. The cylindrical battery as defined in claim 3, wherein: the second limiting part (13) is annular and surrounds the bottom surface of the cover plate body (11) to form a first counter bore (102), the size of an opening of the first counter bore (102) is smaller than that of the bottom, and the plastic part (5) is filled in the first counter bore (102).
5. The cylindrical battery as defined in claim 4, wherein: the first counter bore (102) and the first through hole (101) are coaxially arranged, and the distance between the edge of the bottom of the first counter bore (102) and the edge of the outer ring of the sealing ring (4) is 3-7 mm.
6. The cylindrical battery as defined in claim 3, wherein: the periphery of the pole edge part (22) is a fifth limiting part (220), and the fifth limiting part (220) is inserted into the plastic part (5) and is integrally injection-molded with the plastic part.
7. The cylindrical battery as defined in claim 1, wherein: the cover plate (1) comprises a cover plate body (11) and a first limiting portion (12), a first through hole (101) is formed in the cover plate body (11), the cover plate body (11) is close to the edge of the first through hole (101) and extends downwards to form the first limiting portion (12), and a sealing ring (4) is arranged between the cover plate body (11) and an electrode column edge portion (22) and is abutted to the first limiting portion (12).
8. The cylindrical battery as defined in claim 1, wherein: the plastic part (5) is continuously filled between the upper surface of the cover plate (1), the sealing ring (4) and the pole (2).
9. The cylindrical battery as defined in claim 8, wherein: be provided with spacing portion of third (210) on utmost point post intermediate portion (21), be provided with spacing portion of fourth (103) on apron (1), plastic part (5) are filled in spacing portion of third (210) and spacing portion of fourth (103) surface in succession.
10. The cylindrical battery as defined in claim 1, wherein: plastic part (5) are including plastic portion (51) and lower plastic portion (52) on the alternate segregation, go up plastic portion (51) and fill in apron (1) upper surface, between sealing washer (4) and utmost point post (2) in succession, and lower plastic portion (52) are filled in apron (1) lower surface.
11. The utility model provides a cylinder type battery, its includes cylinder type casing (6), at least one end opening of cylinder type casing (6), its characterized in that: comprising a cylindrical battery cover plate assembly according to claim 1, the cover plate (1) being arranged in and welded to at least one opening of the cylindrical housing (6).
12. The cylindrical battery as defined in claim 11, wherein: the upper end and the lower end of a part of plastic parts (5) are respectively propped against the bottom surface of the cover plate (1) and the upper surface of the first current collecting disc (8).
13. The cylindrical battery as defined in claim 11, wherein: the thickness of the pole middle part (21) is 0.5-0.8mm.
14. The cylindrical battery as defined in claim 11, wherein: utmost point post intermediate part (21) are for utmost point post edge portion (22) upwards protruding, and utmost point post intermediate part (21) bottom forms open cavity, and first current collecting tray (8) stretch into utmost point post intermediate part (21) bottom cavity and support each other and hold, weld.
15. The cylindrical battery as defined in claim 11, wherein: including continuous current-collecting tray intermediate part (81) and current-collecting tray edge portion (82), current-collecting tray edge portion (82) are formed by current-collecting tray intermediate part (81) horizontal extension and are supported and weld with the foil terminal surface, current-collecting tray intermediate part (81) are for current-collecting tray edge portion (82) upwards protruding, second through-hole (502) have been seted up on plastic part (5), second through-hole (502) just set up first through-hole (101), current-collecting tray intermediate part (81) pass second through-hole (502) and upper surface and utmost point post (2) bottom surface support each other, current-collecting tray intermediate part (81) and utmost point post (2) from the battery outside welded fastening.
16. The cylindrical battery as defined in claim 11, wherein: the upper surface of the first current collecting disc (8) is in tight fit with the bottom surface of the pole middle part (21).
17. The cylindrical battery as defined in claim 11, wherein: one end of the cylindrical shell (6) is opened, the other end of the cylindrical shell is a bottom plate, the cylindrical shell further comprises a second current collecting disc (9), and the upper surface and the lower surface of the second current collecting disc (9) are respectively abutted against and welded with the end face of the foil and the inner surface of the bottom plate of the cylindrical shell (6).
18. The method for producing a cylindrical battery as defined in any one of claims 1 to 10, wherein: the method comprises the following steps of putting a cover plate (1), a sealing ring (4) and a pole (2) in a position relation and placing the cover plate, the sealing ring and the pole into a cavity of an injection mold, wherein the surface of one side of the cover plate (1) to be subjected to injection molding faces upwards; the mold is closed, the injection mold presses the pole (2), and the pole (2) compresses the sealing ring (4) under the action of pressure to achieve the sealing effect; and finally, integrally injection-molding to obtain the plastic part (5).
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| CN116169421A (en) * | 2022-09-09 | 2023-05-26 | 湖北亿纬动力有限公司 | Battery and method for assembling the same |
| CN116706355B (en) * | 2023-08-03 | 2024-01-23 | 深圳海辰储能控制技术有限公司 | Top cap subassembly, battery device and energy storage system |
| CN117497924B (en) * | 2023-12-28 | 2024-03-26 | 星恒电源股份有限公司 | Cover plate and battery top cover forming process |
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