CN115347328B - Cylindrical battery switching structure, cylindrical battery and assembly method of cylindrical battery - Google Patents
Cylindrical battery switching structure, cylindrical battery and assembly method of cylindrical battery Download PDFInfo
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- CN115347328B CN115347328B CN202210898569.9A CN202210898569A CN115347328B CN 115347328 B CN115347328 B CN 115347328B CN 202210898569 A CN202210898569 A CN 202210898569A CN 115347328 B CN115347328 B CN 115347328B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 84
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 230000035515 penetration Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
-
- 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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention belongs to the technical field of batteries, and particularly relates to a cylindrical battery switching structure, a cylindrical battery and an assembly method thereof, wherein the cylindrical battery switching structure comprises a cover body, a sealing piece and a first current collecting member, and the cover body is provided with a first through hole; the sealing piece covers the first through hole and is fixedly connected with the cover body; the first current collecting member is arranged at one side of the cover body; the first current collecting member comprises a base and a convex part, the base and the cover are mutually abutted, and the convex part is used for being electrically connected with the first electrode lead. In the battery assembly process, the first current collecting member and the cover body are welded in advance to form a first welding assembly, a convex part which is formed by bending towards the direction close to the electrode assembly is arranged on the first current collecting member, a first through hole is correspondingly formed in the cover body, and the first current collecting member and a first electrode lead of the electrode assembly can be welded through the first through hole, so that the problem of high difficulty in laser welding of the current collecting member and the cover plate is solved, and in addition, the welding rate is improved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a cylindrical battery switching structure, a cylindrical battery and an assembly method of the cylindrical battery.
Background
At present, a cylindrical full-tab power battery mainly adopts and kneads a flat tab, then a tab and a switching piece are connected in a connection mode of kneading plane welding of a connecting piece and the tab, then a positive connecting piece and a positive post are welded, and a first switching piece and the inner wall of a steel shell or a cover body are welded.
However, the conventional first switching piece and the inner wall of the steel shell are difficult to weld, and the welding rate is low; the welding area of the first switching sheet may occupy a certain space at the negative end in the shell, which reduces the space utilization rate of the inside of the battery cell, and if the welding area is at the pier sealing opening, the problem of poor tightness of the pier sealing is caused.
In view of the above problems, new solutions have also been partially proposed, namely: the first switching piece is directly welded with the cover body by laser, so that the cover body has the advantages of small occupied space, large welding area, small resistance and the like.
However, when the production process is adopted, the first switching piece is usually welded with the cathode lug firstly, then the cover body is welded with the steel shell in a sealing way, and finally the cover body is welded with the first switching piece, but as the thickness of the cover body is thicker than that of the first switching piece, laser penetration welding of the first switching piece from the cover body side in a laser welding way can cause poor welding or risk of welding through, and the process is difficult.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, a cylindrical battery switching structure is provided to solve the problem that the current switching piece and the cover plate are difficult to weld by laser.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the cylindrical battery switching structure comprises a cover body, a sealing piece and a first current collecting member, wherein the cover body is provided with a first through hole penetrating through the thickness of the cover body; the sealing piece covers the first through hole and is fixedly connected with the cover body; the first current collecting member is arranged at one side of the cover body; the first current collecting member comprises a base part and a convex part formed by the protrusion of the base part in a direction away from the cover body, wherein the base part and the cover body are mutually abutted, and the convex part is used for being electrically connected with the first electrode lead.
Further, in the axial direction of the cover, the projection of the convex portion and the projection of the cover do not overlap.
Further, the seal member includes a welded portion and an extension portion formed by the welded portion protruding in a direction approaching the first current collecting member, the extension portion being accommodated in the first through hole.
Further, the first through hole is located in the middle of the cover body, and the ratio of the aperture of the first through hole to the diameter of the cover body is 35% -80%.
Further, the thickness of the welding part is 0.2 mm-0.4 mm, and the thickness of the cover body is 0.4 mm-0.8 mm.
Further, the welding part is provided with an annular sinking table, and the depth of the annular sinking table is 0.2 mm-1 mm.
Further, an annular weak area is arranged on the sealing element and is used for pressure relief.
The second object of the present invention is: there is provided a cylindrical battery including: the electrode assembly comprises a shell, an electrode assembly, a pole column, a second current collecting member and the cylindrical battery switching structure, wherein the shell is of a cylindrical structure with an open end; the electrode assembly is arranged in the shell, and a first electrode lead and a second electrode lead are respectively led out from two ends of the electrode assembly; the pole is arranged at one end of the shell far away from the open end; the second current collecting member is electrically connected with the second electrode lead, and one end of the pole column penetrates through the shell and is connected with the second current collecting member; the cover body is arranged on the open opening and is in sealing connection with the shell, and the first current collecting component is electrically connected with the first electrode lead.
Further, a first insulator is included for sealing a gap between the pole and the housing.
Further, the electrode assembly further comprises a second insulating member, and an end portion of the second insulating member facing the electrode assembly is formed with an abutting portion protruding outward in a thickness direction of the second insulating member, the abutting portion being for abutting against the electrode assembly.
Further, the abutting portion is surrounded to form an accommodating cavity, and the second collecting member is arranged in the accommodating cavity.
The third object of the present invention is to: there is provided an assembling method of a cylindrical battery, comprising the steps of:
the cover body and the first current collecting member are welded to form a first welding assembly;
a second electrode lead welded to the second current collecting member; a first electrode lead welded with a first current collecting member in the first welding assembly;
the electrode assembly is placed in the case;
the second current collecting component is welded with the pole by ultrasonic torque;
the cover body in the first welding component and the shell are sealed by laser welding;
injecting electrolyte from the first through hole of the cover body;
the sealing member covers the first through hole, and the sealing member and the cover body are welded.
The invention has the beneficial effects that: the cylindrical battery switching structure comprises a cover body, a sealing piece and a first current collecting member, wherein the cover body is provided with a first through hole penetrating through the thickness of the cover body; the sealing piece covers the first through hole and is fixedly connected with the cover body; the first current collecting member is arranged at one side of the cover body; the first current collecting member comprises a base part and a convex part formed by the base part protruding away from the cover body, the base part and the cover body are mutually abutted, and the projection of the convex part and the projection of the cover body are not overlapped in the axial direction of the cover body. The invention provides a cylindrical battery switching structure, in the battery assembling process, a first current collecting member and a cover body are welded in advance to form a first welding assembly, a convex part which is formed by bending towards the direction close to an electrode assembly is arranged on the first current collecting member, a first through hole is arranged in a region of the cover body corresponding to the convex part, and the first current collecting member and a first electrode lead of the electrode assembly can be welded through the first through hole, so that the welding difficulty of the first current collecting member is reduced, and the problem of cold joint of the first current collecting member and the first electrode lead during welding is avoided.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of a structure of a vehicle in embodiment 1 of the invention;
fig. 2 is one of schematic structural views of a cylindrical battery in embodiment 1 of the present invention;
fig. 3 is a second schematic structural view of the cylindrical battery in embodiment 1 of the present invention;
FIG. 4 is a left side view of FIG. 2;
FIG. 5 is a right side view of FIG. 2;
fig. 6 is a schematic structural diagram of a cover in embodiment 1 of the present invention;
FIG. 7 is a schematic view showing the structure of a seal member in embodiment 1 of the present invention;
FIG. 8 is a second schematic structural view of the seal member in the embodiment 1 of the present invention;
fig. 9 is a schematic structural view of a first current collecting member in embodiment 1 of the present invention;
fig. 10 is a schematic structural view of a first insulating member in embodiment 1 of the present invention.
Wherein reference numerals are as follows:
1. a cover body; 1a, the axis direction of the cover body; 11. a first through hole; 2. a seal; 21. a welding part; 22. an extension; 3. a first current collecting member; 31. a base; 32. a convex portion; 4. a housing; 5. an electrode assembly; 6. a pole; 7. a second current collecting member; 8. a first insulating member; 81. a first insulating portion; 82. a connection part; 83. a second insulating portion; 9. a second insulating member; 91. an abutting portion;
h1, depth of the annular sinking platform; d1, thickness of the welding part;
100. a vehicle; 101. and a battery.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to 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 application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; unless specified or indicated otherwise, the terms "coupled," "fixed," and the like are to be construed broadly and are, for example, capable of being coupled either permanently or detachably, or integrally or electrically; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The present invention will be described in further detail with reference to fig. 1 to 10, but the present invention is not limited thereto.
Example 1
Referring to fig. 2, this embodiment 1 provides a cylindrical battery including a case 4, an electrode assembly 5, and a cap body 1 connected to the case 4.
The electrode assembly 5 in embodiment 1 of the present invention is formed into a body by winding a first electrode sheet, a second electrode sheet, and a separator together around a winding axis, wherein the separator is an insulator interposed between the first electrode sheet and the second electrode sheet. The first pole piece can be a positive pole piece or a negative pole piece; correspondingly, the second electrode sheet is a negative electrode sheet or a positive electrode sheet, and the electrode assembly 5 has two opposite end portions in the axial direction of the case 4, and the two end portions lead out the first electrode lead and the second electrode lead, respectively. In this embodiment 1, the first electrode lead is a positive electrode tab or a negative electrode tab, and equivalently, the second electrode lead is a negative electrode tab or a positive electrode tab, that is, the polarities of the first electrode lead and the second electrode lead are always opposite.
The case 4 in embodiment 1 of the present invention is hollow in the inside and has a cylindrical structure with an opening, and the cover 1 is disposed in the opening and is connected to the case 4 by a laser welding process.
Referring to fig. 2, a first current collecting member 3 is provided at one side of a cap body 1 in embodiment 1 of the present invention.
The inventors found that although the laser welding of the first current collecting member 3 and the cap body 1 has the advantages of small occupied space, large welding area, small resistance, etc., the current welding process is that the electrode assembly 5 is put into a case, then the first current collecting member 3 and the tab are welded, then the cap body 1 and the steel case are sealed and welded, and finally the cap body 1 and the first current collecting member 3 are welded by laser penetration welding. Although the process has certain advantages, in the actual battery production and manufacturing process, the process difficulty is high in specific application, and the risk of poor welding or penetration welding is easy to occur.
The inventors have found through analysis that, in the actual production process, in order to ensure that the strength of the cap 1 meets the production requirement, the thickness of the cap 1 is often thicker than that of the first current collecting member 3, so that when the electrode assembly 5 is put into the case 4, the cap 1 and the first current collecting member 3 are welded together from the side of the cap 1 by laser welding, which easily causes a risk of poor welding or penetration.
Based on this, the first current collecting member 3 and the cap 1 in embodiment 1 of the present invention are welded in advance to form a first welded assembly, that is, the first current collecting member 3 and the cap 1 are welded in advance to form a first welded piece before the electrode assembly 5 is put into the case 4, so that the first current collecting member 3 and the cap 1 can be welded from the side of the first current collecting member 3, avoiding the risk of poor welding or welding through the first current collecting member 3.
In order to ensure that the battery can adopt the connection mode in the production and manufacturing process, the cylindrical battery is further improved in embodiment 1 of the invention, which specifically comprises the following steps:
in embodiment 1 of the present invention, the middle part of the cap body 1 is provided with a first through hole 11 penetrating the thickness thereof, and in this embodiment 1, the aperture of the first through hole 11 is 35% to 80% of the diameter of the cap body 1, and the first through hole 11 is sealed by the sealing member 2, so that the case 4 and the cap body 1 form a closed space accommodating the electrode assembly 5.
More specifically, in this embodiment 1, the first current collecting member 3 includes the base portion 31 and the convex portion 32 formed by the base portion 31 protruding in a direction away from the lid body 1, the base portion 31 and the lid body 1 are abutted against each other, the projection of the convex portion 32 and the projection of the lid body 1 do not overlap in the thickness direction 1a of the lid body, and the end face of the convex portion 32 and the first electrode lead are welded together by laser penetration welding.
In order to ensure that the welding quality between the protruding portion 32 and the first electrode lead does not overlap with the projection of the lid 1, that is, the protruding portion 32 is disposed corresponding to the first through hole 11 of the lid 1, in this embodiment 1, the first through hole 11 is located at the middle position of the lid 1, and the aperture of the first through hole 11 is 35% -80% of the diameter of the lid 1, more preferably, the ratio of the aperture of the first through hole 11 to the diameter of the lid 1 is selected from 0.5, 0.6, 0.7 and 0.8. By the design, in actual welding, the convex part 32 and the first electrode lead can be welded together through the first through hole 11, so that laser can penetrate through the thickness of the convex part 32, cold joint is avoided, and welding yield is improved.
In embodiment 1, considering that the first current collecting member 3 and the first electrode lead have a sufficient welding area, since the end face of the protrusion 32 is used for welding with the first electrode lead, the end face area of the protrusion 32 determines the welding area, and in welding, in order to avoid the occurrence of false welding by laser, it is necessary to weld the protrusion 32 on the end face of the first electrode lead through the first through hole, and therefore, the ratio of the aperture of the first through hole 11 to the diameter of the lid 1 is set to 0.6, and thus, by such a design, the aperture of the first through hole 11 can be made sufficiently large, and the end face area of the protrusion 32 can meet the welding requirement, so that the protrusion 32 provided corresponding to the first through hole 11 is welded on one side of the first electrode lead through the first through hole 11, and at the same time, the rigidity strength of the battery end face is also ensured, so that the battery end face is not easily deformed under the impact of external force.
Further, referring to fig. 2 and 8, the sealing member 2 includes a welding portion 21, and an extension portion 22 formed by the welding portion 21 partially protruding toward the first current collecting member 3, the extension portion 22 being accommodated in the first through hole 11. More specifically, the welding portion is provided with an annular sinking table, the depth H1 of the annular sinking table is 0.2 mm-1 mm, and therefore, the periphery of the welding portion 21 is provided with an annular table surface, the annular table surface surrounds the periphery of the extending portion 22, when the first welding component is assembled with the shell 4, the annular table surface is abutted against the end face of the cover body 1, the sealing member 2 can be lapped on one end face of the cover body 1, then the welding portion 21 of the sealing member 2 is fixedly connected with the cover body 1 in a laser welding mode, and by adopting the lap welding mode, the risk that the sealing member 2 falls into the battery when being impacted by external force can be avoided, and the connection firmness of the sealing member 2 and the cover body 1 is enhanced.
In this embodiment 1, a groove is disposed on a side of the sealing element 2 facing away from the first current collecting member 3, the groove and the first through hole 11 are disposed correspondingly, and an explosion-proof score can be etched in the groove, so that the surface of the sealing element 2 has a weak area, and when the air pressure in the battery reaches the upper limit air pressure value, the weak area is exploded to form a pressure relief opening, so that the air or liquid in the battery is discharged through the pressure relief opening, and explosion of the battery is avoided.
The thickness D1 of the welded portion 21 in example 1 was 0.2mm to 0.4mm, and the thickness of the lid 1 was 0.4mm to 0.8mm. The design is beneficial to welding the welding part 21 and the cover body 1 together by adopting laser penetration welding from the side of the welding part 21, and improves the welding rate.
In this embodiment 1, the extension 22 has a cylindrical shape, and the diameter of the extension 22 is smaller than or equal to the aperture of the first through hole 11. By the design, when the air pressure in the battery reaches the upper limit air pressure, the extension part 22 can be timely exploded to form a pressure relief opening, so that gas or liquid in the battery can be conveniently discharged, and explosion of the battery is avoided.
In this embodiment 1, the end of the housing 4 remote from the open end is provided with a mounting hole penetrating the thickness of the end wall of the housing 4, and the pole 6 is partially inserted in the mounting hole, and one end of the pole 6 passes through the mounting hole and is fixedly connected with the second current collecting member 7.
More specifically, the second current collecting member 7 and the second electrode lead are electrically connected, and the electric power of the electrode assembly 5 can be drawn out to the outside of the case 4 by welding the second current collecting member 7 to one end surface of the electrode post 6.
In this embodiment 1, in order to ensure that insulation is maintained between the pole 6 and the housing 4, a gap is formed between the housing 4 and the pole 6, and the first insulating member 8 is partially filled in the gap.
Wherein, the first insulating member 8 includes a first insulating portion 81, a connecting portion 82 and a second insulating portion 83, and the first insulating portion 81 and the second insulating portion 83 are respectively disposed at both ends of the connecting portion 82 to form an i-shaped structure. The connection portion 82 is used for sealing a gap between the pole 6 and the housing 4, and an annular clamping portion is formed between the first insulation portion 81, the connection portion 82 and the second insulation portion 83 in a surrounding mode, and the annular clamping portion and the housing 4 are matched with each other, so that the first insulation piece 8 is clamped on the end face of the housing 4.
In embodiment 1, the pole 6 and the connection portion 82 are connected by interference fit.
In order to prevent the second current collecting member 7 from moving and communicating with the housing 4 by an external force, in the present embodiment 1, a second insulator 9 is further provided between the second current collecting member 7 and the housing 4.
In the conventional battery, a certain movable space exists between the two end surfaces of the electrode assembly 5 and the shell 4 in the assembly or use process, so that the electrode assembly 5 is easy to move back and forth in the shell 4, and when the electrode assembly 5 moves in the shell 4 towards the direction close to one end of the pole 6, a first electrode lead led out from the other end of the electrode assembly 5 and the first current collecting member 3 are easy to fall off, so that the battery is subjected to cold welding. In order to prevent this problem, the second insulator 9 in this embodiment 1 is formed with an abutment portion 91 protruding outward in the thickness direction thereof, one end of the abutment portion 91 abuts on the electrode assembly 5, the abutment portion 91 is surrounded with a receiving chamber in which the second current collecting member 7 is disposed. The abutting portion 91 abuts against one end face of the electrode assembly 5, so that the electrode assembly 5 can be limited, the electrode assembly 5 is limited in the battery cavity of the casing 4, and the electrode assembly 5 is prevented from moving in the battery cavity, so that stability and reliability of the battery are guaranteed.
The cylindrical battery provided in this embodiment 1 is suitable for various electric devices using the battery.
The powered device may be a vehicle 100, a cell phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 100 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.
For convenience of description, the following embodiments will take the electric device as an example of the vehicle 100.
For example, as shown in fig. 1, a schematic structural diagram of a vehicle 100 according to an embodiment of the present application, the vehicle 100 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle 100 may have a motor, a controller for controlling the battery 101 to supply power to the motor, and a battery 101. For example, the battery 101 may be provided at the bottom or the head or tail of the vehicle 100. The battery 101 may be used to power the vehicle 100, for example, the battery 101 may be used as an operating power source for the vehicle 100, for the circuitry of the vehicle 100, for example, for starting, navigating, and operating power requirements of the vehicle 100 when in operation. In another embodiment of the present application, the battery 101 may not only serve as an operating power source for the vehicle 100, but also as a driving power source for the vehicle 100, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 100.
Example 2
The present embodiment 2 provides a method for assembling a cylindrical battery, wherein the cylindrical battery in the present embodiment 2 is the cylindrical battery in the above embodiment 1, and the method comprises the following steps:
s1, winding a first pole piece, a second pole piece and a diaphragm to form an electrode assembly 5;
s2, respectively flattening a first electrode lead and a second electrode lead which are positioned at two ends of the electrode assembly 5;
s3, welding the cover body 1 and the first current collecting member 3 to form a first welding assembly;
s4, welding the second electrode lead and the second current collecting member 7; the first electrode lead is welded with the first current collecting member 3 in the first welding assembly;
s5, placing the electrode assembly 5 into the shell 4;
s6, ultrasonic torque welding of the second current collecting member and the pole;
s7, sealing the cover body 1 and the shell 4 in the first welding assembly through laser welding;
s8, injecting electrolyte from the first through hole 11 of the cover body 1;
s9, the sealing member 2 covers the first through hole 11, and the sealing member 2 and the cover 1 are welded to form a second welding assembly.
Example 3
Embodiment 3 provides a method for assembling a cylindrical battery, where the cylindrical battery in embodiment 3 is the cylindrical battery in embodiment 1, and the method includes the following steps:
s1, respectively die-cutting a plurality of first electrode leads and a plurality of second electrode leads by a first pole piece and a second pole piece;
s2, winding the first pole piece, the second pole piece and the diaphragm to form an electrode assembly 5, and respectively flattening a plurality of first electrode leads and a plurality of second electrode leads;
s3, welding the cover body 1 and the first current collecting member 3 to form a first welding assembly;
s4, welding the second electrode lead and the second current collecting member 7; the first electrode lead is welded with the first current collecting member 3 in the first welding assembly;
s5, placing the electrode assembly 5 into the shell 4;
s6, ultrasonic torque welding of the second current collecting member and the pole;
s7, sealing the cover body 1 and the shell 4 in the first welding assembly through laser welding;
s8, injecting electrolyte from the first through hole 11 of the cover body 1;
s9, the sealing member 2 covers the first through hole 11, and the sealing member 2 and the cover 1 are welded to form a second welding assembly.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the invention pertains from the foregoing disclosure and teachings. Therefore, the present invention is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (12)
1. A cylindrical battery switching structure which is characterized in that: comprising the following steps:
the device comprises a cover body (1), wherein the cover body (1) is provided with a first through hole (11) penetrating through the thickness of the cover body;
the sealing piece (2) covers the first through hole (11) and is fixedly connected with the cover body (1);
a first current collecting member (3), the first current collecting member (3) being disposed at one side of the cover (1);
the first current collecting member (3) comprises a base (31) and a convex part (32) formed by the part of the base (31) protruding away from the cover body (1), the base (31) and the cover body (1) are mutually abutted, the convex part area corresponds to the first through hole on the cover body, and the convex part (32) is in laser penetration welding with a first electrode lead through the first through hole (11).
2. The cylindrical battery switching structure as claimed in claim 1, wherein: in the axial direction of the cover (1), the projection of the convex part (32) and the projection of the cover (1) do not overlap.
3. The cylindrical battery switching structure as claimed in claim 1, wherein: the sealing element (2) comprises a welding part (21) and an extension part (22) formed by the part of the welding part (21) protruding towards the direction close to the first current collecting member (3), wherein the extension part (22) is accommodated in the first through hole (11).
4. The cylindrical battery switching structure as claimed in claim 1, wherein: the first through hole (11) is positioned in the middle of the cover body (1), and the ratio of the aperture of the first through hole (11) to the diameter of the cover body (1) is 35% -80%.
5. A cylindrical battery transfer structure as in claim 3, wherein: the thickness of the welding part (21) is 0.2 mm-0.4 mm, and the thickness of the cover body (1) is 0.4 mm-0.8 mm.
6. A cylindrical battery transfer structure as in claim 3, wherein: the welding part (21) is provided with an annular sinking table, and the depth of the annular sinking table is 0.2 mm-1 mm.
7. The cylindrical battery switching structure as claimed in claim 1, wherein: an annular weak area is arranged on the sealing element and used for pressure relief.
8. A cylindrical battery, comprising:
the shell (4), the said shell (4) is a tubular structure with open one end;
the electrode assembly (5) is arranged in the shell (4), and a first electrode lead and a second electrode lead are respectively led out from two ends of the electrode assembly (5);
a pole (6), the pole (6) being arranged at one end of the housing (4) remote from the open mouth;
a second current collecting member (7), wherein the second current collecting member (7) is electrically connected with the second electrode lead, and one end of the pole (6) passes through the shell (4) and is connected with the second current collecting member (7);
the cylindrical battery adapting structure according to any one of claims 1 to 7, wherein a cover body (1) is provided at the open mouth and is in sealing connection with the case (4), and a first current collecting member (3) is electrically connected with the first electrode lead.
9. A cylindrical battery as in claim 8, wherein: further comprising a first insulation (8), said first insulation (8) being used to seal a gap between said pole (6) and said housing (4).
10. A cylindrical battery as in claim 8, wherein: the electrode assembly further comprises a second insulating part (9), wherein an abutting part (91) is formed by protruding outwards of one end part of the second insulating part (9) facing the electrode assembly (5) along the thickness direction of the second insulating part (9), and the abutting part (91) is used for abutting the electrode assembly (5).
11. A cylindrical battery according to claim 10, comprising: the abutting part (91) is surrounded to form an accommodating cavity, and the second collecting member (7) is arranged in the accommodating cavity.
12. A method of assembling a cylindrical battery as claimed in any one of claims 8 to 11, comprising the steps of:
the cover body (1) and the first current collecting member (3) are welded to form a first welding assembly;
the second electrode lead is welded with a second current collecting member (7); a first electrode lead is welded with a first current collecting member (3) in the first welding assembly;
the electrode assembly (5) is placed in the case (4);
the second current collecting component (7) is welded with the pole (6) through ultrasonic torque;
the cover body (1) in the first welding assembly and the shell (4) are sealed by laser welding;
injecting electrolyte from the first through hole (11) of the cover body (1);
a seal (2) covers the first through hole (11), and the seal (2) and the cover (1) are welded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210898569.9A CN115347328B (en) | 2022-07-28 | 2022-07-28 | Cylindrical battery switching structure, cylindrical battery and assembly method of cylindrical battery |
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| CN202210898569.9A CN115347328B (en) | 2022-07-28 | 2022-07-28 | Cylindrical battery switching structure, cylindrical battery and assembly method of cylindrical battery |
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| CN115347328B true CN115347328B (en) | 2024-03-15 |
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| WO2024133409A1 (en) * | 2022-12-23 | 2024-06-27 | Northvolt Ab | Secondary cell |
| WO2024133384A1 (en) * | 2022-12-23 | 2024-06-27 | Northvolt Ab | Secondary cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000323114A (en) * | 1999-05-12 | 2000-11-24 | At Battery:Kk | Sealed battery |
| JP2016225014A (en) * | 2015-05-27 | 2016-12-28 | 日立オートモティブシステムズ株式会社 | Cylindrical secondary battery |
| CN114725628A (en) * | 2022-04-21 | 2022-07-08 | 远景动力技术(江苏)有限公司 | Battery assembly and battery manufacturing method |
| CN217062293U (en) * | 2022-01-25 | 2022-07-26 | 云山新能源材料技术(深圳)有限公司 | Cylindrical battery |
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- 2022-07-28 CN CN202210898569.9A patent/CN115347328B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000323114A (en) * | 1999-05-12 | 2000-11-24 | At Battery:Kk | Sealed battery |
| JP2016225014A (en) * | 2015-05-27 | 2016-12-28 | 日立オートモティブシステムズ株式会社 | Cylindrical secondary battery |
| CN217062293U (en) * | 2022-01-25 | 2022-07-26 | 云山新能源材料技术(深圳)有限公司 | Cylindrical battery |
| CN114725628A (en) * | 2022-04-21 | 2022-07-08 | 远景动力技术(江苏)有限公司 | Battery assembly and battery manufacturing method |
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Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Country or region after: China Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |