CN111900451B - Conical surface sealing type cylindrical battery and preparation method thereof - Google Patents
Conical surface sealing type cylindrical battery and preparation method thereof Download PDFInfo
- Publication number
- CN111900451B CN111900451B CN202010584563.5A CN202010584563A CN111900451B CN 111900451 B CN111900451 B CN 111900451B CN 202010584563 A CN202010584563 A CN 202010584563A CN 111900451 B CN111900451 B CN 111900451B
- Authority
- CN
- China
- Prior art keywords
- sealing
- steel shell
- structural member
- cylinder structure
- pole group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- 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 conical surface sealing type cylindrical battery, wherein a pole group is arranged in a steel shell, electrolyte is injected into the steel shell, a sealing ring is matched and sleeved in the steel shell, a sealing structural member is matched and sleeved in the sealing ring, the upper end of the steel shell, the corresponding sealing ring and the side wall of the sealing structural member are jointly extruded inwards to form an extrusion part with the lower end being an inwards inclined plane and the upper end being a vertical straight line, the upper end of the sealing ring and the upper end of the side wall of the sealing structural member are jointly bent outwards by 180 degrees to tightly wrap the top of the steel shell to form a sealing part, the bottom of the sealing structural member is welded with the upward end of the pole group, the periphery of a substrate of an upper sealing cover plate is welded on the bottom of the sealing structural member, a safety valve is arranged in a space formed between the upper sealing cover plate and the sealing structural member, and the downward end of the pole group is welded with the bottom of the steel shell. Also provided is a method of making the battery of the invention. The battery has the advantages of novel structure, lower internal resistance, lower cost, good sealing strength and simpler preparation process.
Description
Technical Field
The invention relates to a conical surface sealing type cylindrical battery and a preparation method thereof.
Background
The cylindrical secondary battery mainly comprises a steel shell, a negative electrode current collector, a pole group, a positive electrode current collector, an insulating ring, an insulating tape, a sealing ring and a cap, and the existing manufacturing process is generally as follows: winding the positive plate, the diaphragm and the negative plate into a pole group and winding glue for fixation, welding a positive current collector at the positive end of the pole group, namely the part of the positive plate exceeding the diaphragm, welding a negative electrode current collector at the negative electrode end of the electrode group, namely the part of the negative electrode sheet exceeding the diaphragm, placing an insulating ring at the positive electrode end or the negative electrode end of the electrode group and wrapping the insulating ring by using an insulating tape to prevent the positive electrode end or the negative electrode end of the electrode group from being extruded at the slot rolling part of the steel shell to cause short circuit, enabling a tab of the positive electrode current collector or the negative electrode current collector to penetrate through the insulating ring, placing and wrapping the electrode group in the steel shell in a mode that one end of the insulating ring faces upwards, welding the negative electrode current collector or the positive electrode current collector at the end facing downwards of the electrode group on the bottom of the steel shell, then rolling the steel shell to perform slot rolling, and injecting liquid into the steel shell, and then welding the lug of the positive electrode current collector or the lug of the negative electrode current collector at the upward end of the electrode group with the cap combination, and finally sealing the cap to obtain the battery. The preparation process has the advantages that a plurality of parts are used, a plurality of parts are connected in a spot welding mode, the steel shell needs to be subjected to slot rolling, the available space in the steel shell can be reduced to a certain extent through the slot rolling process, the available space of a pole group of a high-capacity battery is limited, in addition, in order to prevent the slot rolling position of the steel shell from being in short connection with the pole group, an insulating adhesive tape and an insulating ring need to be arranged at the slot rolling position, the material cost and the operation cost are increased to a certain extent, in addition, the sealing of the existing preparation process adopts a sealing process of horizontal edge covering of the steel shell, the edge covering direction of the sealing is vertical to the internal pressure direction of the battery, the stress structure is not good, and when the battery is charged, the sealing force of the edge covering sealing of the steel shell can be broken along with the rise of the internal pressure of the battery, and finally, the liquid leakage of the battery is caused, and even the battery explodes.
Disclosure of Invention
The invention aims to provide a conical surface sealed cylindrical battery which has the advantages of novel structure, lower internal resistance, lower cost and good sealing strength. The invention also provides a preparation method of the conical surface sealing type cylindrical battery, and the process is simplified.
The invention is realized by the following scheme:
a conical surface sealing type cylindrical battery comprises a positive plate, a negative plate, a diaphragm and a steel shell, wherein the positive plate, the diaphragm and the negative plate are wound into a pole group in a mode that the positive plate and the negative plate are staggered and one side of a pole strip of the positive plate exceeds the diaphragm and one side of a pole strip of the negative plate exceeds the diaphragm, the pole group is arranged in the steel shell, electrolyte is injected into the steel shell, the conical surface sealing type cylindrical battery further comprises a sealing structural member, a sealing upper cover plate, a safety valve and a sealing ring, the sealing structural member is of a cylindrical structure with a closed bottom, the bottom of the sealing structural member is provided with an exhaust hole, the exhaust hole is opposite to a central hole of the pole group, namely a hole formed by a winding needle after the pole group is wound and molded, the sealing upper cover plate comprises a circular base plate, the middle position of the base plate is upwards arched to form a cylindrical protruding part, the sealing ring is of a cylindrical structure with the top and the bottom not closed, the sealing ring is sleeved in the steel shell in a matched mode, and the bottom of the sealing ring is contacted with one end of the pole group upwards, the sealing structure is sleeved in the sealing ring in a matched mode that the opening faces upwards, the upper end of the steel shell and the corresponding sealing ring and the side wall of the sealing structure are jointly inwards extruded to form an extrusion part with an inwards inclined plane at the lower end and a vertical straight line at the upper end, the bottom end of the extrusion part and the upward end of the pole group are separated by a certain distance, namely, the lower end of the sealing ring and the lower end of the side wall of the sealing structure are not inwards extruded, the upper end of the sealing ring and the upper end of the side wall of the sealing structure are jointly outwards bent by 180 degrees to tightly wrap the top of the steel shell to form a sealing part, the downward side of the bottom of the sealing structure is welded with the upward end of the pole group, the periphery of the substrate of the sealing upper cover plate is welded on the upward side of the bottom of the sealing structure, the cylindrical bulge of the sealing upper cover plate is just communicated with the exhaust hole of the sealing structure, and the safety valve is arranged in an up-down compression state to form a hollow space between the cylindrical bulge of the sealing upper cover plate and the bottom of the sealing structure In the chamber, the top of the safety valve props against the top of the cylindrical convex part of the sealing upper cover plate, the bottom of the safety valve completely covers the exhaust hole of the sealing structural part, a gap is reserved between the periphery of the safety valve and the inner wall of the cylindrical convex part of the sealing upper cover plate, and the downward end of the pole group is welded with the bottom of the steel shell.
Furthermore, at least one air relief hole is formed in the position, located on the periphery of the bottom of the protruding part of the cylinder, of the base plate of the upper cover plate of the seal. The number of the air leakage holes can be designed according to needs, and the number of the air leakage holes is 2-5 in general design.
Further, the outer diameter of the sealing part does not exceed the outer diameter of the steel shell.
In order to guarantee the light weight of the steel shell and guarantee the welding strength of the part, exceeding the diaphragm, of the bottom of the steel shell and the negative pole piece of the pole group, the thickness of the bottom of the steel shell is 0.1-0.2 mm thicker than that of the side wall of the steel shell.
Further, the top surface of the cylindrical convex part of the sealing upper cover plate is lower than the top surface of the sealing part.
Further, the bent part of the sealing ring exceeds the bent part of the side wall of the sealing structure.
In order to meet the process requirement of the sealing part, the included angle between the inclined plane of the extrusion part and the horizontal plane is 15-45 degrees.
The preparation method of the conical surface sealing type cylindrical battery comprises the following steps:
(1) winding the prepared positive plate, the diaphragm and the prepared negative plate into a pole group in a way that the positive plate and the negative plate are staggered, and the side where the pole belt of the positive plate is positioned exceeds the diaphragm, and the side where the pole belt of the negative plate is positioned exceeds the diaphragm, winding and fixing the pole group, and then placing the pole group in a steel shell, so that the downward end of the pole group is contacted with the bottom of the steel shell; the positive plate and the negative plate are prepared according to the prior preparation process of the positive plate and the negative plate of the end-face welding battery, namely, if the current collectors of the positive plate and the negative plate are nickel-plated punched steel strips, a white edge can be directly reserved on one side of the positive plate and the negative plate to be used as a polar band of the positive plate and the negative plate, and no other polar band needs to be welded; if the current collectors of the positive plate and the negative plate are foamed nickel, a white edge is reserved on one side of the positive plate and the negative plate, a pole strip is welded on the white edge, the pole strip is made of a nickel strip or a nickel-plated strip, and the pole strip is used as a part welded with the bottom of the sealing structural member and the bottom of the steel shell; the pole group is prepared according to the existing preparation process of the pole group of the end face welding battery; after the pole group is arranged in the steel shell, the upward end of the pole group can be a positive pole end, namely a positive pole piece exceeds a diaphragm part, or a negative pole end, namely a negative pole piece exceeds the diaphragm part, if the upward end of the pole group is the positive pole end, the sealing upper cover plate and the sealing structural member are used as the positive pole output end of the battery, the steel shell is used as the negative pole output end of the battery, and correspondingly, the outermost ring of the pole group is in contact with the inner wall of the steel shell and is a negative pole piece; if the upward end of the pole group is a negative end, the sealing upper cover plate and the sealing structural member are used as a negative output end of the battery, the steel shell is used as a positive output end of the battery, and correspondingly, a positive plate is arranged between the outermost ring of the pole group and the inner wall of the steel shell in contact;
(2) firstly, a sealing ring is sleeved in a steel shell in a matching way, so that the bottom of the sealing ring is contacted with the upward end of a pole group, and the top of the sealing ring exceeds the top of the steel shell, then a sealing structural member is sleeved in the sealing ring in a matching way with an upward opening, so that the bottom of the sealing structural member is contacted with the upward end of the pole group, and the top of the side wall of the sealing structural member exceeds the top of the sealing ring, then the downward surface of the bottom of the sealing structural member is welded with the upward end of the pole group, the downward end of the pole group is welded with the bottom of the steel shell, then the upper end of the steel shell, the corresponding sealing ring and the side wall of the sealing structural member are jointly inwards extruded to form an extrusion part with the lower end being an inwards inclined plane and the upper end being a vertical straight line, so that a certain distance is kept between the bottom of the extrusion part and the upward end of the pole group, then the upper end of the sealing ring and the upper end of the side wall of the sealing structural member are jointly outwards bent by 180 degrees to tightly wrap the top of the steel shell to form a sealing part, then injecting electrolyte into the steel shell through the vent hole of the sealing structural part;
(3) place the relief valve on the bottom one side up that seals the structure earlier, make the bottom of relief valve cover the exhaust hole that seals the structure completely, later will seal the cylinder bulge cover of upper cover plate and extrude the relief valve, make the relief valve compress from top to bottom, the top of relief valve supports and seals and leaves the space between the periphery of the cylinder bulge's of upper cover plate top and relief valve and the inner wall that seals the cylinder bulge of upper cover plate, the base plate periphery that will seal the upper cover plate at last and the bottom one side welding up that seals the structure together.
The welding modes involved in the steps (2) and (3) can adopt laser welding and other modes.
The conical surface sealing type cylindrical battery is novel in structure, does not need an anode current collector, a cathode current collector, an insulating ring at a rolling groove part, an insulating tape and the like, reduces the cost of parts, thereby reducing the manufacturing cost, improves the available space in the height direction in a steel shell, reduces the overall height of the battery and also can improve the battery capacity by reducing the use of the anode current collector, the cathode current collector and the insulating ring at the rolling groove part; the sealing structure piece is in the same place with the one end lug weld up of utmost point group, the steel casing bottom is in the same place with the one end lug weld down of utmost point group, welding area of contact increases, simultaneously because of having reduced the internal resistance and the welding internal resistance of materials such as negative current collector, positive current collector itself, make the whole internal resistance of battery greatly reduce, the battery heavy current charge-discharge performance has also been improved simultaneously, directly with the steel casing, the sealing washer, the common extrusion of sealing structure piece lateral wall forms the extrusion portion, and the sealing washer upper end, sealing structure piece lateral wall upper end is outwards buckled 180 jointly and is closely wrapped the steel casing top and form the sealing portion, sealing portion atress structure is superior to the level and is bordured sealing structure, seal intensity is good. The preparation method of the conical surface sealed cylindrical battery does not need the working procedure of welding the positive electrode current collector and the negative electrode current collector, does not need to roll the steel shell, eliminates the steps of placing the insulating ring at the upward end of the electrode group and pasting the insulating tape, and simplifies the process.
Drawings
FIG. 1 is a schematic view showing the structure of a conical-sealed cylindrical battery according to example 1;
FIG. 2 is a sectional view of a conical-sealed cylindrical battery in example 1;
FIG. 3 is an enlarged, partial, top cross-sectional view of a conical-capped cylindrical battery of example 1;
FIG. 4 is an enlarged partial bottom cross-sectional view of a conical-sealed cylindrical battery of example 1;
FIG. 5(a) is a schematic structural diagram of the upper cover plate of the closure in example 1;
fig. 5(b) is a schematic structural view of the upper cover plate of the seal in embodiment 1 (ii).
Detailed Description
The invention will be further described with reference to the following examples and drawings, but the invention is not limited to the examples.
Example 1
A conical surface sealing type cylindrical battery is disclosed, as shown in figures 1, 2, 3 and 4, and comprises a positive plate 1, a negative plate 2, a diaphragm 3, a steel shell 4, a sealing structural member 5, a sealing upper cover plate 6, a safety valve 7 and a sealing ring 8, wherein the thickness of the bottom of the steel shell 4 is 0.1mm thicker than that of the side wall of the steel shell 4, the positive plate 1, the diaphragm 3 and the negative plate 2 are wound into a pole group 9 in a way that the positive plate 1 and the negative plate 2 are staggered, the side where a pole zone of the positive plate 1 is located exceeds the diaphragm 3, and the side where a pole zone of the negative plate 2 is located exceeds the diaphragm 3, the outermost ring of the pole group is in contact with the inner wall of the steel shell and is a negative plate, the pole group 9 is arranged in the steel shell 4 in a way that the positive end, namely the part of the positive plate 1 exceeds the diaphragm 3, faces upwards, electrolyte is injected into the steel shell 4, the sealing structural member 5 is of a cylinder structure with a closed bottom, a central hole 51 is arranged at the middle position of the bottom of the sealing structural member 5, and is provided with a vent hole 51 and is formed by a winding needle after being wound with the pole group 9, as shown in fig. 5(a) and 5(b), the upper cover plate 6 of the closure includes a circular base plate 61, the middle position of the base plate 61 is arched upwards to form a cylindrical convex part 62, and three air release holes 63 are uniformly distributed on the base plate 61 at the bottom periphery of the cylindrical convex part 62; the sealing ring 8 is a cylinder structure with the top and the bottom not closed, the sealing ring 8 is sleeved in the steel shell 4 in a matching way, the bottom of the sealing ring 8 is contacted with the upward end of the pole group 9, namely the positive pole end (the positive pole piece exceeds the diaphragm part), the sealing structural member 5 is sleeved in the sealing ring 8 in a matching way with the upward opening, the upper end of the steel shell 4, the corresponding side wall of the sealing structural member 5 and the corresponding sealing ring 8 are jointly inwards extruded to form an extruding part 10 with the lower end being an inwards inclined plane and the upper end being a vertical straight line, the included angle between the inclined plane of the extruding part 10 and the horizontal plane is 25 degrees, the distance between the bottom end of the extruding part 10 and the upward end of the pole group 9, namely the positive pole end (the positive pole piece exceeds the diaphragm part) is kept, the top end of the sealing ring 8 and the upper end of the side wall of the sealing structural member 5 are jointly outwards bent by 180 degrees to tightly wrap the top of the steel shell 4 to form a sealing part, the outer diameter of the sealing part does not exceed the outer diameter of the steel shell, the bent part of the sealing ring 8 exceeds the bent part of the side wall of the sealing structural member 5, the bottom downward surface of the sealing structure member 5 is welded with the upward end of the pole group 9, namely the positive pole end (the positive pole piece exceeds the diaphragm part), the periphery of the substrate 61 of the sealing upper cover plate 6 is welded on the middle position of the upward surface of the bottom of the sealing structure member 5, the cylindrical bulge part 62 of the sealing upper cover plate 6 is oppositely communicated with the vent hole 51 of the sealing structure member 5, the top surface of the cylindrical bulge part of the sealing upper cover plate is lower than the top surface of the sealing part, the safety valve 7 is arranged in a space formed between the cylindrical bulge part 62 of the sealing upper cover plate 6 and the bottom of the sealing structure member 5 in an up-down compression state, the top of the safety valve 7 is propped against the top of the cylindrical bulge part 62 of the sealing upper cover plate 6, the bottom of the safety valve 7 completely covers the vent hole 51 of the sealing structure member 5, and a gap is left between the periphery of the safety valve 7 and the inner wall of the cylindrical bulge part 62 of the sealing upper cover plate 6, the downward end of the pole group 9, namely the negative end (the part of the negative pole piece beyond the diaphragm) is welded with the bottom of the steel shell 4.
The method for preparing the conical-surface-sealed cylindrical battery in the embodiment 1 comprises the following steps:
(1) winding the prepared positive plate, the diaphragm and the prepared negative plate into a plate group in a way that the positive plate and the negative plate are staggered, one side of the positive plate with a plate strip exceeds the diaphragm, and one side of the negative plate with a plate strip exceeds the diaphragm, the negative plate is contacted with the inner wall of the steel shell at the outermost ring of the plate group, winding and fixing the plate group, and then placing the plate group into the steel shell in a way that the positive end, namely the part of the positive plate exceeding the diaphragm, faces upwards, so that the downward end, namely the negative end (the part of the negative plate exceeding the diaphragm) of the plate group is contacted with the bottom of the steel shell;
(2) firstly, the sealing ring is sleeved in a steel shell in a matching way, so that the bottom of the sealing ring is in contact with one upward end of the pole group, namely the positive pole end (the positive pole piece exceeds the diaphragm part), and the top of the sealing ring exceeds the top of the steel shell, then the sealing structural member is sleeved in the sealing ring in a matching way with an upward opening, so that the bottom of the sealing structural member is in contact with one upward end of the pole group, namely the positive pole end (the positive pole piece exceeds the diaphragm part), and the top of the side wall of the sealing structural member exceeds the top of the sealing ring, then the downward surface of the sealing structural member is welded with the upward end of the pole group, namely the positive pole end (the positive pole piece exceeds the diaphragm part) in a laser welding way, the downward end of the pole group, namely the negative pole end (the negative pole piece exceeds the diaphragm part) is welded with the bottom of the steel shell in a laser welding way, then the upper end of the steel shell, the corresponding sealing structural member and the sealing side wall are jointly inwards extruded to form a lower end which is an inwards inclined plane, The upper end of the extrusion part is a vertical straight line, so that the included angle between the inclined plane of the extrusion part and the horizontal plane is 25 degrees, the bottom end of the extrusion part is away from the upward end of the electrode group, namely the positive electrode end (the positive electrode plate exceeds the diaphragm part) by a certain distance, then the upper end of the sealing ring and the upper end of the side wall of the sealing structural member are bent outwards by 180 degrees together to tightly wrap the top of the steel shell to form a sealing part, and then electrolyte is injected into the steel shell through the exhaust hole of the sealing structural member;
(3) place the relief valve earlier on the intermediate position of the bottom one side up of sealing the structure, make the bottom of relief valve cover the exhaust hole of sealing the structure completely, later will seal the cylinder bulge of upper cover plate and cover between two parties and extrude the relief valve, make the relief valve compress from top to bottom, the top of relief valve supports and seals and leaves the space between the periphery of the cylinder bulge of upper cover plate's top and relief valve and the inner wall of the cylinder bulge of upper cover plate, the base plate periphery that will seal the upper cover plate at last and the bottom one side of sealing the structure adopt laser welding's mode welding to be in the same place up.
Example 2
A conical-sealed cylindrical battery having a structure similar to that of the conical-sealed cylindrical battery of embodiment 1, except that: the thickness of steel casing bottom is 0.2mm than the thickness of steel casing lateral wall thickness, utmost point group outer lane and steel casing inner wall contact be the positive plate, utmost point group uses the negative pole end promptly the negative plate to surpass the diaphragm part mode upwards to arrange in the steel casing, the one end up after the steel casing is arranged in to utmost point group promptly is the negative pole end promptly, the inclined plane of extrusion portion is 45 with the contained angle of horizontal plane, extrusion portion bottom and utmost point group one end up promptly the negative pole end (the negative plate surpasss diaphragm part) at a certain distance away, the bottom of sealing the structure is down the one side and the one end up of utmost point group promptly the negative pole end (the negative plate surpasss diaphragm part) weld together, the one end down of utmost point group promptly the positive pole end (the positive plate surpasss diaphragm part) and steel casing bottom phase weld together.
The process for manufacturing a conical-capped cylindrical battery of example 2 is substantially the same as the process for manufacturing a conical-capped cylindrical battery of example 1, except that:
1. in the step (1), the outermost ring of the pole group is in contact with the inner wall of the steel shell and is a positive plate, and the pole group is wound and fixed and then is placed in the steel shell in a mode that the negative end, namely the negative plate exceeds the diaphragm part and faces upwards, so that the downward end, namely the positive end (the positive plate exceeds the diaphragm part) of the pole group is in contact with the bottom of the steel shell;
2. in step (2), the sealing washer bottom contacts with the one end up of utmost point group promptly negative pole end (negative pole piece surpasses diaphragm portion) promptly, seal the structure bottom and the one end up of utmost point group promptly negative pole end (negative pole piece surpasss diaphragm portion) and contact, the bottom of sealing the structure one side down and the one end up of utmost point group promptly negative pole end (negative pole piece surpasss diaphragm portion) adopt laser welding's mode to weld together, the one end down of utmost point group promptly positive pole end (positive pole piece surpasss diaphragm portion) and the steel casing bottom adopt laser welding's mode to weld together, the slope inclined plane of extrusion portion is 45 with the contained angle of horizontal plane, and extrusion portion bottom and the one end up of utmost point group promptly negative pole end (positive pole piece surpasss diaphragm portion) at a distance from each other.
Claims (7)
1. The utility model provides a conical surface seals type cylinder battery, includes positive plate, negative pole piece, diaphragm and steel casing, positive plate, diaphragm, negative pole piece are crossed dislocation and positive plate utmost point area place one side surpasss diaphragm, negative pole piece utmost point area place one side and surpasss diaphragm's mode coiling extremely group, utmost point group arranges in the steel casing, annotates electrolyte, its characterized in that in the steel casing: the sealing structure is a cylinder structure with a closed bottom, an exhaust hole is formed in the bottom of the sealing structure and is opposite to a central hole of a pole group, the sealing upper cover plate comprises a circular base plate, the middle position of the base plate is arched upwards to form a cylinder protruding part, the sealing ring is a cylinder structure with the top and the bottom not closed, the sealing ring is sleeved in a steel shell in a matching mode, the bottom of the sealing ring is in contact with one end of the pole group facing upwards, the sealing structure is sleeved in the sealing ring in a matching mode with the opening facing upwards, the upper end of the steel shell, the corresponding sealing ring and the side wall of the sealing structure are jointly extruded inwards to form an extrusion part, the lower end of the extrusion part is an inwards inclined plane, the upper end of the extrusion part is a vertical straight line, a certain distance is reserved between the bottom end of the extrusion part and one end of the pole group facing upwards, and the upper end, the lower end of the sealing ring, the cylinder structure is a cylinder structure with a closed bottom, the cylinder structure is opened and the cylinder structure is opened upwards, the cylinder structure is opened, the cylinder structure is opened in a cylinder structure, the cylinder structure is opened in the cylinder structure, the cylinder structure is opened in the cylinder structure, the cylinder structure is sealed in the cylinder structure, the cylinder structure is sealed in the cylinder structure, the cylinder structure is sealed structure, the cylinder structure is sealed structure, the cylinder structure is sealed structure, the cylinder structure is sealed in the cylinder structure, the cylinder structure is sealed structure, the cylinder structure is sealed structure, the cylinder structure, the, The upper end of the side wall of the sealing structural member is bent outwards 180 degrees together to tightly wrap the top of the steel shell to form a sealing part, the downward surface of the bottom of the sealing structural member is welded with the upward end of the pole group, the periphery of the substrate of the upper sealing cover plate is welded on the upward surface of the bottom of the sealing structural member, the cylindrical convex part of the upper sealing cover plate is oppositely communicated with the exhaust hole of the sealing structural member, the safety valve is arranged in a space formed between the cylinder bulge part of the sealing upper cover plate and the bottom of the sealing structural member in an up-down compression state, the top of the safety valve props against the top of the cylindrical protruding part of the sealing upper cover plate, the bottom of the safety valve completely covers the exhaust hole of the sealing structural part, a gap is reserved between the periphery of the safety valve and the inner wall of the cylindrical protruding part of the sealing upper cover plate, and the downward end of the pole group is welded with the bottom of the steel shell.
2. The conical-sealed cylindrical battery according to claim 1, wherein: at least one air leakage hole is formed in the position, located on the periphery of the bottom of the protruding portion of the cylinder, of the base plate of the upper cover plate of the seal.
3. The conical-sealed cylindrical battery according to claim 2, wherein: the outer diameter of the sealing part is not more than the outer diameter of the steel shell.
4. The conical-sealed cylindrical battery according to claim 1, wherein: the thickness of the bottom of the steel shell is 0.1-0.2 mm thicker than that of the side wall of the steel shell.
5. The conical-sealed cylindrical battery according to any one of claims 1 to 4, wherein: the top surface of the cylindrical convex part of the sealing upper cover plate is lower than the top surface of the sealing part.
6. The conical-sealed cylindrical battery according to any one of claims 1 to 4, wherein: the bent part of the sealing ring exceeds the bent part of the side wall of the sealing structural part.
7. A method for manufacturing a conical-surface-sealed cylindrical battery according to any one of claims 1 to 6, comprising: the method comprises the following steps:
(1) winding the prepared positive plate, the diaphragm and the prepared negative plate into a pole group in a way that the positive plate and the negative plate are staggered, and the side where the pole belt of the positive plate is positioned exceeds the diaphragm, and the side where the pole belt of the negative plate is positioned exceeds the diaphragm, winding and fixing the pole group, and then placing the pole group in a steel shell, so that the downward end of the pole group is contacted with the bottom of the steel shell;
(2) firstly, a sealing ring is sleeved in a steel shell in a matching way, so that the bottom of the sealing ring is contacted with the upward end of a pole group, and the top of the sealing ring exceeds the top of the steel shell, then a sealing structural member is sleeved in the sealing ring in a matching way with an upward opening, so that the bottom of the sealing structural member is contacted with the upward end of the pole group, and the top of the side wall of the sealing structural member exceeds the top of the sealing ring, then the downward surface of the bottom of the sealing structural member is welded with the upward end of the pole group, the downward end of the pole group is welded with the bottom of the steel shell, then the upper end of the steel shell, the corresponding sealing ring and the side wall of the sealing structural member are jointly inwards extruded to form an extrusion part with the lower end being an inwards inclined plane and the upper end being a vertical straight line, so that a certain distance is kept between the bottom of the extrusion part and the upward end of the pole group, then the upper end of the sealing ring and the upper end of the side wall of the sealing structural member are jointly outwards bent by 180 degrees to tightly wrap the top of the steel shell to form a sealing part, then injecting electrolyte into the steel shell through the vent hole of the sealing structural part;
(3) place the relief valve on the bottom one side up that seals the structure earlier, make the bottom of relief valve cover the exhaust hole that seals the structure completely, later will seal the cylinder bulge cover of upper cover plate and extrude the relief valve, make the relief valve compress from top to bottom, the top of relief valve supports and seals and leaves the space between the periphery of the cylinder bulge's of upper cover plate top and relief valve and the inner wall that seals the cylinder bulge of upper cover plate, the base plate periphery that will seal the upper cover plate at last and the bottom one side welding up that seals the structure together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010584563.5A CN111900451B (en) | 2020-06-24 | 2020-06-24 | Conical surface sealing type cylindrical battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010584563.5A CN111900451B (en) | 2020-06-24 | 2020-06-24 | Conical surface sealing type cylindrical battery and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111900451A CN111900451A (en) | 2020-11-06 |
| CN111900451B true CN111900451B (en) | 2022-05-10 |
Family
ID=73207956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010584563.5A Active CN111900451B (en) | 2020-06-24 | 2020-06-24 | Conical surface sealing type cylindrical battery and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111900451B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4398369A1 (en) * | 2022-05-09 | 2024-07-10 | Contemporary Amperex Technology Co., Limited | Device and method for preparing battery cell |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6229057A (en) * | 1985-07-31 | 1987-02-07 | Shin Kobe Electric Mach Co Ltd | Manufacture of cylindrical cell |
| CN1636283A (en) * | 2000-06-21 | 2005-07-06 | 永备电池有限公司 | Battery construction having cover assembly and method therefor |
| CN1748329A (en) * | 2003-02-11 | 2006-03-15 | 永备电池有限公司 | Electrochemical cell with low volume cover assembly |
| CN201758146U (en) * | 2010-08-16 | 2011-03-09 | 宁波富邦电池有限公司 | Battery cathode bottom cover |
| CN107710447A (en) * | 2015-06-17 | 2018-02-16 | 罗伯特·博世有限公司 | Stackable battery unit and the battery module for including stackable battery unit |
| CN209843826U (en) * | 2019-03-17 | 2019-12-24 | 河南超力新能源有限公司 | Cylindrical battery |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938012B (en) * | 2009-06-29 | 2014-04-30 | 深圳市比克电池有限公司 | Method for manufacturing cylindrical battery capable of improving battery capacity |
| CN109301104B (en) * | 2018-10-29 | 2021-04-20 | 湖南科霸汽车动力电池有限责任公司 | Cap assembly for cylindrical battery and cylindrical secondary battery |
-
2020
- 2020-06-24 CN CN202010584563.5A patent/CN111900451B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6229057A (en) * | 1985-07-31 | 1987-02-07 | Shin Kobe Electric Mach Co Ltd | Manufacture of cylindrical cell |
| CN1636283A (en) * | 2000-06-21 | 2005-07-06 | 永备电池有限公司 | Battery construction having cover assembly and method therefor |
| CN1748329A (en) * | 2003-02-11 | 2006-03-15 | 永备电池有限公司 | Electrochemical cell with low volume cover assembly |
| CN201758146U (en) * | 2010-08-16 | 2011-03-09 | 宁波富邦电池有限公司 | Battery cathode bottom cover |
| CN107710447A (en) * | 2015-06-17 | 2018-02-16 | 罗伯特·博世有限公司 | Stackable battery unit and the battery module for including stackable battery unit |
| CN209843826U (en) * | 2019-03-17 | 2019-12-24 | 河南超力新能源有限公司 | Cylindrical battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111900451A (en) | 2020-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3813171B1 (en) | Button battery for improving utilization rate of radial space | |
| CN110085921B (en) | Rechargeable hard shell lithium ion battery | |
| CN111354912B (en) | Electric connection method, electric connection structure and product of button cell pole shell and electrode lug | |
| CN111463371B (en) | Anti-seepage welding method and welding structure of button battery and application of anti-seepage welding method and welding structure | |
| CN111463395B (en) | Button cell production method capable of reducing false welding rate and button cell produced by button cell production method | |
| CN214378547U (en) | Button type lithium ion battery | |
| CN111900451B (en) | Conical surface sealing type cylindrical battery and preparation method thereof | |
| CN117996380B (en) | 1.5V lithium battery and manufacturing method thereof | |
| CN111900452B (en) | Vertical sealed cylindrical battery and preparation method thereof | |
| CN201069794Y (en) | A secondary lithium ion battery component with secure valve | |
| CN105932337A (en) | Processing method of chargeable crust lithium ion battery | |
| CN113013527A (en) | Novel button battery and manufacturing and mounting method of shell sealing element structure | |
| CN218351579U (en) | Utmost point post seal structure and battery monomer thereof | |
| CN111354916A (en) | Electric connection method, electric connection structure and product of button cell pole shell and electrode lug | |
| CN217158396U (en) | Pole welding structure of square steel shell battery and battery | |
| CN212517323U (en) | Novel structure of round soft-shell battery | |
| CN217214907U (en) | Lithium ion battery cover plate and lithium ion battery comprising same | |
| CN111082158B (en) | Quick-charging button battery and manufacturing method thereof | |
| CN112382811A (en) | Novel structure of round soft-shell battery | |
| CN211719699U (en) | Winding type lithium ion battery | |
| CN111341967A (en) | Production method of anti-seepage button battery and button battery manufactured by same | |
| CN211578869U (en) | Button cell pole shell and electrode lug electric connection structure | |
| CN219350444U (en) | Button cell cover plate and button cell thereof | |
| CN213959095U (en) | Miniature lithium ion battery | |
| CN214754058U (en) | Sealing structure for positive terminal of lithium battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210721 Address after: 410100 first floor, building 10, advanced energy storage and energy conservation demonstration Industrial Park, No. 169, Section 2, Renmin East Road, Changsha Economic and Technological Development Zone, Hunan Province Applicant after: NATIONAL ENGINEERING RESEARCH OF ADVANCED ENERGY STORAGE MATERIALS Address before: 410205 No. 348, west slope, Tongzi high tech Development Zone, Hunan, Changsha Applicant before: HUNAN COPOWER EV BATTERY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |