CN113809444B - Battery cell - Google Patents
Battery cell Download PDFInfo
- Publication number
- CN113809444B CN113809444B CN202111095220.3A CN202111095220A CN113809444B CN 113809444 B CN113809444 B CN 113809444B CN 202111095220 A CN202111095220 A CN 202111095220A CN 113809444 B CN113809444 B CN 113809444B
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- China
- Prior art keywords
- affected zone
- top cover
- heat affected
- cover plate
- conductive
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- 238000003466 welding Methods 0.000 claims abstract description 123
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 230000035515 penetration Effects 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/153—Lids or covers characterised by their shape for button or coin cells
-
- 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
- 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
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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 invention provides a battery, which comprises a cover plate assembly, a conductive shell and a battery cell, wherein the cover plate assembly is arranged on the conductive shell, and the battery cell is positioned in a cavity of the conductive shell. The cover plate assembly comprises a conductive top cover and a cover plate, the cover plate is connected with the conductive shell in a sealing manner, and the conductive top cover is connected with the cover plate in an insulating manner through an insulating piece. The cover plate assembly further comprises a continuous welding line, the continuous welding line comprises a head end, a main body section and a tail end which are sequentially connected, the main body section continuously extends to the tail end from the head end, namely, the formed continuous welding line is a continuous and uninterrupted welding line, and is formed continuously in one-time welding rather than splicing, so that the phenomenon of overlapping of the welding lines is reduced or avoided, the continuous welding line has lower heat, the problem that an insulating part is heated and melted can be effectively reduced or avoided, and the yield of a finished product of the battery is improved.
Description
Technical Field
The invention relates to the technical field of battery structures, in particular to a battery.
Background
The battery is a small-sized device capable of converting chemical energy into electric energy, such as a button battery, and is generally applied to electronic devices such as electronic watches, bluetooth headsets, electric toys, etc. to provide a power source for the electronic devices, and is very important in daily work and life.
Taking button cell as an example, mainly include conductive shell and apron subassembly, wherein, apron subassembly and conductive shell enclose to establish and are formed with the cavity, and apron subassembly is including conductive top cap and apron, is provided with the insulating part between conductive top cap and apron to keep apart conductive top cap and apron. The cover plate assembly typically has a weld, such as a joint weld, between the cover plate assembly and the conductive housing, or a weld between internal structures of the cover plate assembly, such as between a seal on the cover plate assembly and a conductive top cover of the cover plate assembly. At present, the welding seam on the cover plate assembly is usually formed by spot welding, for example, a plurality of spot welding seams are usually formed on a welding surface, and in order to ensure the welding strength, a long total welding seam is usually formed by splicing the plurality of spot welding seams, and meanwhile, the spot welding seams are partially overlapped, so that the welding strength, the welding tightness and the like are improved.
However, the overlap between the welds may result in higher heat build-up, which may cause the insulation between the conductive top cap and the cover plate to melt by heat, reducing the yield of the battery.
Disclosure of Invention
The invention provides a battery, which solves the problems that in the existing battery, the overlapping between welding seams on a cover plate assembly can cause higher heat accumulation, and an insulating part between a conductive top cover and a cover plate is easy to be heated and melted, so that the yield of the battery is reduced.
The present invention provides a battery comprising: the battery pack comprises a cover plate assembly, a conductive shell and a battery cell, wherein the cover plate assembly is arranged on the conductive shell, the conductive shell is provided with a cavity, the battery cell is positioned in the cavity, the battery cell comprises a first tab and a second tab, and the first tab is electrically connected with the conductive shell;
the cover plate assembly comprises a conductive top cover and a cover plate, a through hole is formed in the cover plate, and the conductive top cover is arranged on the through hole in a penetrating mode and is electrically connected with the second lug; the cover plate is connected with the conductive shell in a sealing way, and the conductive top cover is connected with the cover plate in an insulating way through an insulating piece;
the cover plate assembly is provided with a continuous welding seam, the continuous welding seam comprises a head end, a main body section and a tail end which are sequentially connected, and the main body section continuously extends from the head end to the tail end.
Wherein, the continuous welding seam refers to a continuous and uninterrupted welding seam, namely the welding seam is continuously formed in one welding rather than being formed by splicing a plurality of welding spots or spot welding seams and the like. That is, the head end, the body section, and the tail end are co-located to form a continuous weld, and the body section extends continuously from the head end to the tail end without a splice weld in the head end, the body section, and the tail end. Namely, during welding, one part of the cover plate assembly is taken as a starting point, the other part of the cover plate assembly is taken as a finishing point, the welding is started from the starting point and continuously extends to the finishing point to form the continuous welding seam, wherein the welding seam formed at the starting point position can be the head end of the continuous welding seam, the welding seam formed at the finishing point position is taken as the tail end, and the welding seam between the starting point and the finishing point is taken as the main body section.
The cover plate assembly is welded with other structures through the continuous welding seam, namely the welding seam on the cover plate assembly can be connected through one-time continuous welding, the welding is fast and efficient, the welding duration can be effectively shortened, the working efficiency of welding operation is improved, and therefore the production efficiency of a battery is effectively improved. And the continuous welding seam extends from the head end to the tail end continuously and can be formed into a long welding seam at one time, compared with the long welding seam formed by splicing a plurality of spot welding seams, the phenomenon of overlapping and splicing the welding seams does not exist, so that the continuous welding seam has lower heat, the problem that an insulating part is heated and melted can be effectively reduced or avoided, the yield of a finished product of a battery is effectively improved, and the economic cost is reduced.
In one possible implementation manner, the conductive top cover is provided with a liquid injection hole, the liquid injection hole is communicated with the cavity, and the liquid injection hole is provided with a sealing element;
the continuous weld extends from a side of the seal facing away from the conductive top cap into the conductive top cap, and the seal is connected with the conductive top cap through the continuous weld.
In one possible implementation, the head end and the tail end are connected, and the head end and the tail end are partially overlapped, and the continuous weld seam is annular.
In one possible implementation, the continuous weld is annular, the radial width of the trailing end gradually decreasing from an end of the trailing end adjacent the main body section to an end of the trailing end facing away from the main body section.
In one possible implementation, the center angle of the tail end is in the range of 10 ° -90 °.
In one possible implementation, the welding device further comprises a first heat affected zone and a second heat affected zone, the first heat affected zone and the second heat affected zone respectively extending from a face of the sealing member facing away from the conductive top cap into the conductive top cap, the first heat affected zone and the second heat affected zone respectively being located on two sides of the continuous weld.
In one possible implementation, the first heat affected zone and the second heat affected zone are annular, the first heat affected zone, the second heat affected zone, and the continuous weld are disposed concentrically, and a diameter of the first heat affected zone is greater than a diameter of the second heat affected zone.
In one possible implementation, the radial width of the first heat affected zone ranges from 0.05mm to 0.5mm;
the radial width of the second heat affected zone ranges from 0.05mm to 0.5mm.
In one possible implementation, the radial width of the head end and the body section ranges from 0.1mm to 0.3mm.
In one possible implementation, the seal has a thickness of 0.05mm to 0.15mm, the conductive cap has a thickness of 0.1mm to 0.25mm, and the conductive cap has a thickness greater than the seal;
the penetration of the continuous weld is greater than the seal thickness, and the penetration of the continuous weld is less than the sum of the seal thickness and the conductive cap thickness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural view of a battery non-mounted sealing member according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a continuous weld provided in an embodiment of the present application;
FIG. 4 is a photograph of a continuous weld provided in an embodiment of the present application;
FIG. 5 is a photograph of a tail end provided in an embodiment of the present application;
fig. 6 is a cross-sectional view of a battery provided in an embodiment of the present application;
fig. 7 is a partial enlarged view of the area a in fig. 6.
Reference numerals illustrate:
100-cell; 10-a cover plate assembly; 11-a conductive top cover;
111-a liquid injection hole; 12-cover plate; 20-an electrically conductive housing;
30-an insulator; 40-sealing member; 50-continuous weld;
51-head end; 52-a body segment; 53-tail end;
60-a first heat affected zone; 70-a second heat affected zone.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural view of a battery without a sealing member, and fig. 2 is a schematic structural view of a battery according to an embodiment of the present application.
In this embodiment, the button battery is taken as an example for explanation, and the button battery is a power supply device commonly used in electronic equipment, such as electronic watches, bluetooth headsets, and electric toys, and has very wide application, and it mainly generates electric energy by chemical reaction of internal positive electrode materials and negative electrode materials in electrolyte.
The electrolyte is typically disposed in a cavity of a button cell, for example, as shown in fig. 1, the cell 100 may include a conductive housing 20, a cover assembly 10, and a cell (not shown), wherein the cover assembly 10 is disposed on the conductive housing 20, the conductive housing 20 has a cavity, and the cell is disposed in the cavity.
Specifically, for example, the conductive housing 20 may include a bottom wall and a side wall surrounding the bottom wall, where the bottom wall and the side wall of the conductive housing 20 together define a cavity of the conductive housing 20. Electrolyte may also be disposed within the cavity of the conductive housing 20, where the cells chemically react to generate electrical energy.
The battery cell can include a battery cell body, a first tab and a second tab which are arranged on the battery cell body, and the first tab and the second tab are electrically connected with the battery cell body. The first tab may be a positive tab, and the second tab may be a negative tab. Alternatively, the first tab may be a negative tab, and the second tab may be a positive tab.
In this embodiment, taking the first tab as the negative electrode tab and the second tab as the positive electrode tab as an example, the first tab may be electrically connected with the conductive top cover 11, and the second tab may be electrically connected with the conductive shell 20, so that the electric energy generated by the battery core can be transmitted to the conductive top cover 11 and the conductive shell 20, and the conductive top cover 11 is the negative electrode end of the battery 100, and the conductive shell 20 is the positive electrode end of the battery 100.
Alternatively, the first tab may be electrically connected to the conductive housing 20, and the second tab may be electrically connected to the conductive top cover 11, so that the conductive housing 20 is the negative terminal of the battery 100, and the conductive top cover 11 is the positive terminal of the battery 100.
Specifically, the cover assembly 10 includes a conductive top cover 11 and a cover 12, wherein the cover 12 is disposed on the conductive housing 20, and the cover 12 is hermetically connected to the conductive housing 20. The cover plate 12 is provided with a through hole, and the conductive top cover 11 is arranged on the through hole in a penetrating way and is electrically connected with the second lug.
For example, in one possible embodiment, the conductive top cover 11 is partially located on the side of the cover plate 12 facing away from the conductive housing 20, and the side of the conductive top cover 11 facing toward the cover plate has a protrusion. Wherein the protruding portion of the conductive top cover 11 passes through the through hole of the cover plate 12 to be electrically connected with the second lug.
Alternatively, in another possible embodiment, the conductive top cover 11 is partially located on the side of the cover plate 12 facing the conductive housing 20, and the side of the conductive top cover 11 facing the cover plate 12 has a protrusion. One side of the conductive top cover 11, which is away from the cover plate 12, is electrically connected with the second electrode lug, and the protruding portion of the conductive top cover 11 passes through the through hole of the cover plate 12, so that the positive electrode of the battery can be led out to the outside of the battery through the protruding portion, and the battery can be conveniently connected with other circuit structures.
Wherein, the cover plate 12 and the conductive top cover 11 are connected in an insulating manner, for example, an insulating member 30 may be disposed between the conductive top cover 11 and the cover plate 12 to insulate the conductive top cover 11 and the cover plate 12 from each other, i.e. to insulate the conductive top cover 11 and the conductive housing 20 from each other. In addition, the insulating member 30 has a certain sealing effect, and can provide a certain sealing property between the conductive top cover 11 and the cover plate 12, thereby preventing the electrolyte from leaking out from the gap between the conductive top cover 11 and the cover plate 12.
Currently, there is typically a weld on the cover plate assembly 10, such as the weld may be a connection weld between the cover plate assembly 10 and the conductive housing 20. Alternatively, the weld may also be a connection weld between the cover plate assembly 10 and the seal 40, such as on the cover plate assembly 10. Alternatively, a joint weld between the cover plate assembly 10 and other structures is also possible.
In the related art, the welding seam on the cover plate assembly 10 is generally formed by pulse spot welding, so that a spot-column-shaped welding seam is formed on a welding surface (such as the surface of the cover plate assembly 10), a plurality of spot welding seams are generally formed to ensure the welding connection strength, a longer total welding seam is formed by splicing the plurality of spot welding seams, and two adjacent spot welding seams are generally partially overlapped to further improve the welding strength of the welding seam and improve the sealing property of the welding seam connection.
However, when the total welding seam requirement is completed by the splicing of a plurality of spot welds, the required welding time is longer and the working efficiency is lower. Moreover, since the plurality of spot welds overlap each other, heat is concentrated more, and the temperature of the welds is increased, which easily causes the insulating member 30 between the conductive top cover 11 and the cap plate 12 to be melted by heat, thereby reducing the yield of the battery 100 and increasing the economic cost.
Based on the above-mentioned problems, the battery 100 provided in the embodiments of the present application can make the weld joint on the cover plate assembly 10 complete quickly and effectively. And, the heat of the welding seam can be effectively reduced, thereby reducing or avoiding the phenomenon that the insulating member 30 is melted, improving the yield of the finished product of the battery 100, and reducing the cost. Fig. 3 is a schematic structural view of a continuous weld according to an embodiment of the present application.
In the present application, with continued reference to fig. 2, the battery 100 further includes a continuous weld 50, which may be a connection weld between the cover plate assembly 10 and the conductive housing 20. Alternatively, the continuous weld may be a connecting weld between the cover plate assembly 10 and the seal 40. Alternatively, the continuous weld may be a connection weld between the cover plate assembly 10 and other structures.
For example, referring to FIG. 2, in the present embodiment, the cover plate assembly 10 and the seal 40 are illustrated as being joined by the continuous weld.
It should be noted that, the continuous weld 50 refers to a continuous, uninterrupted weld, that is, a weld formed continuously in one welding, rather than being formed by splicing a plurality of welding points or spot welding points.
Referring to fig. 3, the continuous weld 50 includes a head end 51, a body section 52, and a tail end 53 that are sequentially connected, wherein the body section 52 extends continuously from the head end 51 to the tail end 53. The head end 51, the body section 52 and the tail end 53 together define a continuous weld 50. That is, where no splice weld exists in the head end 51, the body section 52, and the tail end 53, the body section 52 extends continuously from the head end 51 to the tail end 53. That is, during welding, one of the positions on the sealing member 40 is taken as a starting point, the other position on the sealing member 40 is taken as an ending point, and the continuous welding seam 50 is formed by starting welding from the starting point and continuously extending and welding to the ending point, wherein the welding seam formed at the starting point position can be the head end 51 of the continuous welding seam 50, the welding seam formed at the ending point position is the tail end 53, and the welding seam between the starting point and the ending point is the main body section 52.
For example, the continuous weld 50 may be formed by continuous laser welding, which is a welding method of performing welding once by continuously heating and melting a base material by a laser beam, and is a type of laser penetration welding, in which a weld formed by performing a welding operation is a continuous weld 50.
The welding connection between the sealing element 40 and the conductive top cover 11 is realized through the continuous welding seam 50, namely, the sealing element 40 and the conductive top cover 11 can be connected through one-time continuous welding, the welding is fast and efficient, the welding duration can be effectively shortened, the working efficiency of the welding operation is improved, and the production efficiency of the battery 100 is effectively improved.
In addition, the continuous welding seam 50 extends continuously from the head end 51 to the tail end 53 and can be formed into a long welding seam at one time, compared with the long welding seam formed by splicing a plurality of spot welding seams, the phenomenon of overlapping and splicing the welding seams does not exist, so that the continuous welding seam 50 has lower heat, the problem that the insulating part 30 is heated and melted can be effectively reduced or avoided, the yield of the battery 100 is effectively improved, and the economic cost is reduced.
Specifically, the conductive top cover 11 is provided with a liquid injection hole 111 (see fig. 1), the liquid injection hole 111 is communicated with the cavity of the conductive housing 20, the electrolyte can be injected into the cavity of the conductive housing 20 through the liquid injection hole 111, and after the injection of the electrolyte is completed, the liquid injection hole 111 can be provided with a sealing member 40 (see fig. 2) to seal the liquid injection hole 111, so that the electrolyte can be prevented from leaking out of the cavity.
The conductive top cover 11 and the sealing member 40 may be made of aluminum. Alternatively, the conductive top cover 11 and the sealing member 40 may be made of other materials with welding performance, and specifically, the molding materials of the conductive top cover 11 and the sealing member 40 may be selected and set according to specific application scenarios.
When the sealing member 40 and the conductive top cover 11 are connected by continuous welding, the continuous welding seam 50 extends from the surface of the sealing member 40 away from the conductive top cover 11 into the conductive top cover 11, so that the sealing member 40 can be connected with the conductive top cover 11 through the continuous welding seam 50. That is, the side of the sealing member 40 facing away from the conductive top cover 11 is used as a welding surface, and the continuous welding seam 50 extends into the conductive top cover 11, but does not extend out of the side of the conductive top cover 11 facing away from the sealing member 40.
Thus, the electric connection between the conductive top cover 11 and the second lug can be facilitated, so that the reliability and the firmness of the connection between the conductive top cover 11 and the second lug are improved, and the reliability and the stability of the battery 100 are improved.
With continued reference to fig. 3, the shape of the continuous bead 50 may be annular, where the leading end 51 and the trailing end 53 of the continuous bead 50 are connected, and the leading end 51 and the trailing end 53 are partially overlapped to form a completely closed annular continuous bead 50, so that stability and reliability of connection between the sealing member 40 and the conductive top cover 11 can be effectively improved, and at the same time, tightness between the sealing member 40 and the conductive top cover 11 can be effectively improved, thereby avoiding leakage of electrolyte, and further improving stability and reliability of the battery 100.
The continuous welding seam may be a regular ring, or the continuous welding seam may be an irregular ring, so long as the sealing connection between the sealing member 40 and the conductive top cover 11 can be achieved. As shown in fig. 3, in this embodiment, the solid base material located at two sides of the continuous weld 50 is subjected to a significant change in structure and performance, that is, in the process of forming the continuous weld 50 between the sealing member 40 and the conductive top cover 11, two sides of the continuous weld 50 are close to each other, and the internal structures of the materials of the sealing member 40 and the conductive top cover 11 are changed, so that the appearance of the solid base material is different.
Specifically, a first heat affected zone 60 and a second heat affected zone 70 are included, wherein the first heat affected zone 60 and the second heat affected zone 70 are located on two sides of the continuous weld 50, respectively, and the first heat affected zone 60 and the second heat affected zone 70 extend from a side of the seal 40 facing away from the conductive top cap 11 to the conductive top cap 11, respectively.
Wherein the shape of the first heat affected zone 60 and the second heat affected zone 70 may be the same as the shape of the continuous weld 50, e.g., the shape of the first heat affected zone 60 and the second heat affected zone 70 are both annular, and the first heat affected zone 60, the second heat affected zone 70, and the continuous weld 50 are concentrically disposed.
The diameter of the first heat affected zone 60 may be greater than the diameter of the second heat affected zone 70, i.e., the inner diameter of the first heat affected zone 60 is greater than the outer diameter of the second heat affected zone 70, the first heat affected zone 60 is located outside of the annular continuous weld 50, and the second heat affected zone 70 is located inside of the annular continuous weld 50.
Fig. 4 is a real photograph of a continuous weld provided in an embodiment of the present application, and fig. 5 is a real photograph of a tail end provided in an embodiment of the present application.
With continued reference to fig. 3, the shape of the tail end 53 of the continuous weld 50 may be shaped, for example, from an end of the tail end 53 adjacent to the main body section 52 to an end of the tail end 53 facing away from the main body section 52, the radial width of the tail end 53 gradually decreases, wherein the radial direction refers to a direction extending from the center of the annular shape along the radius of the annular shape. That is, the energy of the weld may be gradually reduced from the end of the tail 53 adjacent the body section 52 to the end of the tail 53 facing away from the body section 52, e.g., the tail 53 gradually reduces the energy of the laser as it is terminated, until the release of the laser energy is completely terminated.
As shown in fig. 4 and 5, the transition of the welding seam at the tail end 53 is smoother, the occurrence of welding seam defects caused by rapid stopping of welding energy can be effectively prevented, the flatness and continuity of the whole continuous welding seam 50 are improved, and the connection strength and sealing strength of the continuous welding seam 50 are improved. Furthermore, the overall aesthetic appearance of the continuous weld 50 can be improved.
The central angle α (shown in fig. 3) of the tail end 53 of the continuous welding seam 50 may have a value ranging from 10 ° to 90 °, so that the tail end 53 may be more smoothly transited and terminated, thereby further improving the flatness and continuity of the whole continuous welding seam 50, further improving the connectivity and sealing of the continuous welding seam 50, and improving the yield of the battery 100.
Fig. 6 is a cross-sectional view of a battery according to an embodiment of the present application, and fig. 7 is a partial enlarged view of a region a in fig. 6.
In this embodiment of the present application, the thickness range of the sealing element 40 may be 0.05mm-0.15mm, and the thickness range of the conductive top cover 11 may be 0.1mm-0.25mm, and the thickness of the conductive top cover 11 is greater than the thickness of the sealing element 40, so that the diffusion of the weld residual heat to the side of the conductive top cover 11 away from the sealing element 40 can be reduced, the heat received by the insulating element 30 can be further effectively reduced, and the condition that the insulating element 30 is melted by heating is reduced or avoided, thereby effectively improving the yield of the battery 100.
In addition, as shown in fig. 6 and 7, the penetration of the continuous weld 50 is greater than the thickness of the sealing member 40 and less than the sum of the thickness of the sealing member 40 and the thickness of the conductive top cover 11, so that the continuous weld 50 can serve to connect the sealing member 40 and the conductive top cover 11, and at the same time, the continuous weld 50 does not extend to the side of the conductive top cover 11 facing away from the sealing member 40, that is, the side of the conductive top cover 11 facing away from the sealing member 40 has no weld or heat affected zone, that is, the conductive top cover 11 has no change in material structure and performance on the side connected to the first tab.
Therefore, the first tab and the conductive top cover 11 can be conveniently connected, and the connection accuracy between the first tab and the conductive top cover 11 is high in requirement and operation difficulty is high when the first tab and the conductive top cover 11 are connected in a welding mode. The continuous welding seam 50 does not exist on the surface of the conductive top cover 11, which is away from the sealing element 40, so that the effect on the welding connection between the first tab and the conductive top cover 11 is avoided, the degree of freedom of the welding position between the first tab and the conductive top cover 11 is improved, the welding difficulty between the first tab and the conductive top cover 11 is reduced, and the efficiency of welding operation is improved. And helps to promote the connection between the first tab and the conductive top cap 11, thereby promoting the stability and reliability of the battery 100.
In the present embodiment, the radial width of the head end 51 and the body section 52 in the continuous weld 50 ranges from 0.1mm to 0.3mm. The penetration of the weld and the width of the weld depend on the amount of welding energy, the greater the welding energy, the deeper the penetration of the weld, and the greater the width of the weld. Conversely, the smaller the welding energy, the smaller the penetration of the weld, and consequently the smaller the width of the weld.
That is, there is also a correlation between the weld width and the weld penetration, and therefore, the radial width of the head end 51 and the main body section 52 of the continuous weld 50 is made to be 0.1mm to 0.3mm, and the penetration of the continuous weld 50 corresponding to the width range can effectively satisfy the connectivity and the sealability between the sealing member 40 and the conductive top cover 11. Meanwhile, the conductive top cover 11 can be prevented from being changed on the side away from the sealing piece 40 due to the influence of residual heat of the welding seam, the connection firmness and reliability between the conductive top cover 11 and the first tab are improved, and the stability and reliability of the battery 100 are improved.
In addition, the width of the welding seam is in the width range, the diffusion of the waste heat of the welding seam to the insulating piece 30 can be reduced, the condition that the insulating piece 30 is heated and melted is effectively reduced or avoided, the yield of the battery 100 is further improved, and the cost of the battery 100 is reduced.
In the present embodiment, the radial width of the first heat affected zone 60 ranges from 0.05mm to 0.5mm and the radial width of the second heat affected zone 70 ranges from 0.05mm to 0.5mm. The penetration of the weld and the heat affected zone area of the weld also depend on the magnitude of the welding energy, the greater the welding energy, the deeper the penetration of the weld, and the greater the heat affected zone area. Conversely, the smaller the welding energy, the smaller the weld penetration, and the smaller the area of the heat affected zone.
That is, there is also a correlation between the area and size of the heat affected zone and the weld penetration such that the radial width of the first heat affected zone 60 and the second heat affected zone 70 ranges from 0.05mm to 0.5mm and the radial width of the second heat affected zone 70 ranges from 0.05mm to 0.5mm. The penetration of the continuous weld 50 corresponding to this width range is effective to satisfy connectivity and tightness between the seal 40 and the conductive top cover 11. At the same time, it is also ensured that the conductive top cover 11 is not affected by the residual heat of the weld joint on the side away from the sealing member 40, and the stability and reliability of the battery 100 are improved.
In addition, the radial width of the first heat affected zone and the radial width of the second heat affected zone are in the above width range, so that the diffusion of the weld residual heat to the insulating member 30 can be reduced, the condition that the insulating member 30 is heated and melted is effectively reduced or avoided, and the yield of the battery 100 is further improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can lead the connection between the two elements or the interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. The battery is characterized by comprising a cover plate assembly, a conductive shell, a battery cell, a first heat affected zone and a second heat affected zone, wherein the cover plate assembly is arranged on the conductive shell, the conductive shell is provided with a cavity, the battery cell is positioned in the cavity, the battery cell comprises a first tab and a second tab, and the first tab is electrically connected with the conductive shell;
the cover plate assembly comprises a conductive top cover and a cover plate, a through hole is formed in the cover plate, and the conductive top cover is arranged on the through hole in a penetrating mode and is electrically connected with the second lug; the cover plate is connected with the conductive shell in a sealing way, and the conductive top cover is connected with the cover plate in an insulating way through an insulating piece;
the cover plate assembly is provided with a continuous welding seam, the continuous welding seam comprises a head end, a main body section and a tail end which are sequentially connected, and the main body section continuously extends from the head end to the tail end;
the head end is connected with the tail end, the head end is overlapped with the tail end, and the continuous welding seam is annular;
the continuous weld seam is in a circular ring shape, and the radial width of the tail end gradually decreases from one end of the tail end adjacent to the main body section to one end of the tail end away from the main body section; the circle center angle of the tail end ranges from 10 degrees to 90 degrees; the radial width of the head end and the main body section ranges from 0.1mm to 0.3mm;
the conductive top cover is provided with a liquid injection hole, the liquid injection hole is communicated with the cavity, and the liquid injection hole is provided with a sealing piece;
the continuous weld extends from a side of the sealing member facing away from the conductive top cover into the conductive top cover, thereby connecting the sealing member with the conductive top cover through the continuous weld;
the thickness of the conductive top cover is greater than the thickness of the sealing element;
the penetration of the continuous weld is greater than the thickness of the sealing element, and the penetration of the continuous weld is less than the sum of the thickness of the sealing element and the thickness of the conductive top cover;
the first heat affected zone and the second heat affected zone extend into the conductive top cover from one face of the sealing member away from the conductive top cover, respectively, and the first heat affected zone and the second heat affected zone are located on two sides of the continuous weld;
the radial width of the first heat affected zone ranges from 0.05mm to 0.5mm;
the radial width of the second heat affected zone ranges from 0.05mm to 0.5mm.
2. The battery of claim 1, wherein the first heat affected zone and the second heat affected zone are annular, the first heat affected zone, the second heat affected zone, and the continuous weld are disposed concentrically, and a diameter of the first heat affected zone is greater than a diameter of the second heat affected zone.
3. The battery of claim 1 or 2, wherein the seal has a thickness of 0.05mm to 0.15mm and the conductive cap has a thickness of 0.1mm to 0.25mm.
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| CN214672776U (en) * | 2021-04-02 | 2021-11-09 | 广东微电新能源有限公司 | Battery cover plate and battery |
| WO2023186049A1 (en) * | 2022-03-31 | 2023-10-05 | 珠海冠宇电池股份有限公司 | Battery |
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| US9061373B2 (en) * | 2011-11-30 | 2015-06-23 | Medtronic, Inc. | Welding method including continuous wave welding and pulse welding for component of an implantable medical device |
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| JP2002042742A (en) * | 2000-07-31 | 2002-02-08 | Toyota Central Res & Dev Lab Inc | Manufacturing method of sealed battery |
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