CN117374486A - Cylindrical battery and method for assembling the same - Google Patents
Cylindrical battery and method for assembling the same Download PDFInfo
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- CN117374486A CN117374486A CN202311390604.7A CN202311390604A CN117374486A CN 117374486 A CN117374486 A CN 117374486A CN 202311390604 A CN202311390604 A CN 202311390604A CN 117374486 A CN117374486 A CN 117374486A
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- current collecting
- bare cell
- collecting disc
- negative electrode
- positive electrode
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- 238000000034 method Methods 0.000 title claims description 13
- 239000011888 foil Substances 0.000 claims abstract description 73
- 229910052751 metal Inorganic materials 0.000 claims abstract description 66
- 239000002184 metal Substances 0.000 claims abstract description 66
- 238000003466 welding Methods 0.000 claims description 64
- 239000011248 coating agent Substances 0.000 claims description 43
- 238000000576 coating method Methods 0.000 claims description 43
- 230000035515 penetration Effects 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 239000011889 copper foil Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 description 76
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000005476 soldering 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
- H01M50/645—Plugs
- H01M50/655—Plugs specially adapted for venting
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a cylindrical battery, comprising: the shell comprises a columnar main body, wherein a first opening is formed in one end of the columnar main body, a second opening is formed in the other end of the columnar main body, one end of the columnar main body extends into the first opening to form a connecting part, the connecting part is bent towards the second opening to form an annular part, and the annular part is bent towards the axis direction of the columnar main body to form a bearing platform part; the periphery of the bare cell is also provided with a metal foil layer electrically connected with the negative electrode lug, and the metal foil layer extends to the end face of the first end of the bare cell and is surrounded on the periphery of the positive electrode lug; the current collecting disc comprises a first current collecting disc connected with the positive electrode lug and a second current collecting disc connected with the metal foil layer, and the second current collecting disc is welded with the inner side surface of the bearing platform part. According to the invention, the metal foil layer is arranged to lead the negative electrode lug at the lower end of the bare cell to the upper end of the bare cell, so that the same-end output of the positive electrode and the negative electrode of the bare cell is realized, and the resistor strung into the shell is avoided.
Description
Technical Field
The invention relates to the field of batteries, in particular to a cylindrical battery and an assembly method thereof.
Background
At present, the lithium ion/sodium ion cylindrical battery gradually becomes a main stream product in new energy industry due to the advantages of high energy density, good capacity consistency and the like, wherein the adoption of a full-tab/current collecting disc structure is determined as a cylindrical battery structure optimal direction by more and more manufacturers, and common problems are that:
1. the current collecting disc of the conventional cylindrical power battery is directly connected into the shell to implement side wall welding assembly, the current collecting disc is welded at the other end of the bare cell and is in electric resistance welding connection with the bottom of the shell close to a small welding area, namely, the anode and the cathode of the battery are connected into the shell resistance in series, so that the resistance value of the cylindrical battery is larger; it is difficult to realize high-rate charge and discharge and the temperature rise is large.
2. The cylinder power battery is difficult to implement explosion-proof valve decompression (one end with a polar post cannot implement the explosion-proof valve due to the too small area, and the middle part of the other end is fixed with the bottom of the shell by resistance welding, so that the explosion-proof valve decompression cannot be implemented), thereby bringing about the safety problem.
Disclosure of Invention
The invention aims to provide a cylindrical battery and an assembly method thereof, so as to realize the same-end output of the positive electrode and the negative electrode of a bare cell, thereby avoiding the problems of stringing into a shell, reducing the resistance of the cylindrical battery and improving the high-rate performance and the charge-discharge temperature rise of the cylindrical power battery.
In order to achieve the above object, in a first aspect, the present invention provides a cylindrical battery comprising: the shell comprises a columnar main body, wherein the columnar main body is of a hollow structure, a first opening is formed in one end of the columnar main body, a second opening is formed in the other end of the columnar main body, one end of the columnar main body extends into the first opening to form a connecting part, the connecting part is bent towards the second opening to form an annular part, and the annular part is bent towards the axis direction of the columnar main body to form a bearing platform part; the bare cell is arranged in the shell, the bare cell is provided with a first end and a second end opposite to the first end, the first end of the bare cell is provided with a positive electrode lug, the second end of the bare cell is provided with a negative electrode lug, the periphery of the bare cell is also provided with a metal foil layer electrically connected with the negative electrode lug, and the metal foil layer extends to the end face of the first end of the bare cell, is enclosed on the periphery of the positive electrode lug and is arranged at intervals with the positive electrode lug; the current collecting disc comprises a first current collecting disc connected with the positive electrode lug, a second current collecting disc connected with the metal foil layer and a third current collecting disc connected with the negative electrode lug, wherein the first current collecting disc and the second current collecting disc are both positioned at the first end of the bare cell, an insulating layer is arranged between the first current collecting disc and the second current collecting disc, and the second current collecting disc is positioned at the inner side of the bearing platform part and is welded with the inner side surface of the bearing platform part.
Preferably, the bare cell includes a cylindrical body formed by stacking and winding a positive electrode sheet, a separator layer, and a negative electrode sheet, wherein the negative electrode sheet includes a negative electrode coating region and the negative electrode tab provided on a lower side in a width direction of the negative electrode coating region, the negative electrode sheet is further provided with a metal region integrally provided with the negative electrode coating region and the negative electrode tab in a length direction thereof, and an upper side edge of the metal region in the width direction of the negative electrode coating region is higher than an upper side edge of the negative electrode coating region in the width direction thereof so that the metal region is located outside the bare cell and forms the metal foil layer; the positive plate comprises a positive electrode coating region and a positive electrode lug arranged on the upper side of the positive electrode coating region in the width direction, and the length of the positive electrode lug is smaller than that of the positive electrode coating region.
Preferably, the number of layers of the metal foil layer is greater than or equal to 5 and less than or equal to 15.
Preferably, the second current collecting disc is hollow and annular, the second current collecting disc comprises a protruding portion and an edge portion formed by extending the bottom of the protruding portion located on the outer side to the outer side of the protruding portion, the edge portion is in welded connection with the metal foil layer, and the top of the protruding portion is in welded connection with the inner side face of the bearing platform portion.
Preferably, the insulating layer is hollow annular, the protruding portion is fixedly connected with the outer side of the insulating layer, and the inner side of the insulating layer is fixedly connected with the first current collecting disc to form an integrally arranged composite current collecting disc.
Preferably, the cylindrical battery further comprises a cover plate assembly, the cover plate assembly comprises an upper cover plate and a bottom welding lug, the edge of the upper cover plate is erected on the bearing platform part and seals the first opening, and the bottom welding lug seals the second opening and is provided with an explosion-proof part.
Preferably, when the shell is a steel shell, the metal foil layer is a copper foil layer, the negative electrode lug is a copper foil full-electrode lug, and the positive electrode lug is an aluminum foil full-electrode lug; or when the shell is an aluminum shell, the metal foil layer is an aluminum foil layer, the negative electrode lug is an aluminum foil full electrode lug, and the positive electrode lug is a copper foil full electrode lug.
In a second aspect, the present invention further provides a method for assembling the cylindrical battery, including the following steps: providing a bare cell, wherein the bare cell is provided with a first end and a second end opposite to the first end, the first end of the bare cell is provided with a positive electrode lug, the second end of the bare cell is provided with a negative electrode lug, the periphery of the bare cell is also provided with a metal foil layer electrically connected with the negative electrode lug, and the metal foil layer extends to the end face of the first end of the bare cell, is arranged around the periphery of the positive electrode lug and is arranged at a distance from the positive electrode lug; providing a current collecting disc, wherein the current collecting disc comprises a first current collecting disc used for being connected with the positive electrode lug, a second current collecting disc used for being connected with the metal foil layer positioned on the first end face of the bare cell, and a third current collecting disc used for being connected with the negative electrode lug, and the negative electrode lug of the bare cell is connected with the third current collecting disc; connecting the positive electrode lug of the bare cell with the first current collecting disc, connecting the metal foil layer positioned on the first end face of the bare cell with the second current collecting disc, and arranging an insulating layer between the first current collecting disc and the second current collecting disc; the method comprises the steps that a shell is provided, the shell comprises a columnar main body, the columnar main body is of a hollow structure, a first opening is formed in one end of the columnar main body, a second opening is formed in the other end of the columnar main body, one end of the columnar main body extends into the first opening to form a connecting part, the connecting part is bent towards the second opening to form an annular part, the annular part is bent towards the axis direction of the columnar main body to form a bearing platform part, a bare cell is mounted in the shell, the positive electrode lug, the first current collecting disc and the second current collecting disc are located at the first opening, and the negative electrode lug and the third current collecting disc are located at the second opening; and pushing the second end of the bare cell by adopting a clamp, and welding and connecting the second current collecting disc with the inner side surface of the bearing platform part.
Preferably, the second current collecting disc is hollow and annular, the second current collecting disc includes a protruding portion and an edge portion formed by extending from a bottom of the protruding portion located at an outer side to an outer side of the protruding portion, and the step of connecting the metal foil layer located on the first end face of the bare cell to the second current collecting disc includes: welding the metal foil layer positioned on the first end face of the bare cell with the edge part; and the step of connecting the second collecting tray with the inner side surface of the bearing platform part comprises the following steps: and welding the top of the protruding part with the inner side surface of the bearing platform part in a laser penetration welding mode.
Preferably, after the step of propping up the second end of the bare cell with the clamp and welding and connecting the second current collecting disc with the inner side surface of the bearing platform part, the method further comprises the following steps: providing a cover plate assembly, wherein the cover plate assembly comprises an upper cover plate and a bottom welding lug, and a pole is arranged in the middle of the upper cover plate; closing the second opening with the bottom tab; the edge of the upper cover plate is erected on the bearing platform part, and the upper cover plate is utilized to close the first opening; a liquid injection hole is formed in the middle of the bottom welding lug, a clamp penetrates through the liquid injection hole and props against the middle of the first current collecting disc so as to fix the pole and the first current collecting disc by laser penetration welding; the liquid injection hole is sealed by the liquid injection Kong Zhuye and a sealing nail.
Compared with the prior art, the positive electrode lug and the negative electrode lug are respectively arranged at the two ends of the bare cell of the cylindrical battery, and the metal foil layer is arranged at the outer side of the bare cell, so that the negative electrode lug at the lower end of the bare cell is led to the upper end of the bare cell, the same end out of the positive electrode and the negative electrode of the bare cell is realized, the resistor which is connected into the shell in series is avoided, the resistance of the cylindrical battery is reduced, the high-rate performance, the charge-discharge temperature rise and the like of the cylindrical power battery are improved.
Drawings
Fig. 1 is a perspective view of a cylindrical battery case according to the present invention.
Fig. 2 is a sectional structural view of the cylindrical battery case of the present invention.
Fig. 3 is a partial sectional structural view of the cylindrical battery case of the present invention.
Fig. 4 is a schematic structural diagram of a positive plate of a bare cell of a cylindrical battery according to the present invention.
Fig. 5 is a schematic structural view of a negative electrode sheet of a bare cell of a cylindrical battery according to the present invention.
Fig. 6 is a view showing the structure of the cylindrical battery of the present invention at an angle after the positive electrode sheet, the separator layer and the negative electrode sheet are wound.
Fig. 7 is a view showing the structure of the cylindrical battery of the present invention at another angle after the positive electrode sheet, the separator layer and the negative electrode sheet are wound.
Fig. 8 is a schematic structural diagram of a bare cell formed by winding a positive plate, a separator layer and a negative plate of the cylindrical battery and leveling or rubbing the metal foil layer, the positive tab, the separator layer and the negative tab.
Fig. 9 is a structural view of a third current collecting plate of the cylindrical battery of the present invention.
Fig. 10 is a structural view of an integrated composite current collecting tray composed of a first current collecting tray, a second current collecting tray and an insulating layer of the cylindrical battery of the present invention.
Fig. 11 is a cross-sectional view of fig. 10.
Fig. 12 is a structural diagram of a bare cell of a cylindrical battery according to the present invention after the first current collecting plate, the second current collecting plate and the third current collecting plate are mounted.
Fig. 13 is a cross-sectional view of fig. 12.
Fig. 14 is a structural view of the bare cell after the first current collecting plate, the second current collecting plate and the third current collecting plate are mounted in the case.
Fig. 15 is a cross-sectional view of fig. 14.
Fig. 16 is a structural view of a cylindrical battery according to the present invention.
Fig. 17 is a cross-sectional view of fig. 16.
Fig. 18 is an enlarged view at C in fig. 17.
Fig. 19 is an enlarged view of D in fig. 17.
Detailed Description
In order to describe the technical content, the constructional features and the effects achieved by the present invention in detail, the following description is made with reference to the embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 to 19, the present invention provides a cylindrical battery including: the device comprises a shell 1, a bare cell 2 and a current collecting disc, wherein the shell 1 comprises a columnar main body 11, the columnar main body 11 is of a hollow structure, a first opening 12 is formed in one end of the columnar main body 11, a second opening 13 is formed in the other end of the columnar main body 11, one end of the columnar main body 11 extends into the first opening 12 to form a connecting part 14, the connecting part 14 is bent towards the second opening 13 to form an annular part 15, and the annular part 15 is bent towards the axis direction of the columnar main body 11 to form a bearing platform part 16; the bare cell 2 is arranged in the shell 1, the bare cell 2 is provided with a first end and a second end opposite to the first end, the first end of the bare cell 2 is provided with a positive electrode lug 212, the second end of the bare cell 2 is provided with a negative electrode lug 222, the periphery of the bare cell 2 is also provided with a metal foil layer 225 electrically connected with the negative electrode lug 222, and the metal foil layer 225 extends to the end face of the first end of the bare cell 2, is arranged around the periphery of the positive electrode lug 212 and is arranged at intervals with the positive electrode lug 212; the current collecting disc comprises a first current collecting disc 31 connected with the positive electrode lug 212, a second current collecting disc 32 connected with the metal foil layer 225 and a third current collecting disc 33 connected with the negative electrode lug 222, wherein the first current collecting disc 31 and the second current collecting disc 32 are positioned at the first end of the bare cell 2, an insulating layer 34 is arranged between the first current collecting disc 31 and the second current collecting disc 32, and the second current collecting disc 32 is positioned at the inner side of the bearing platform part 16 and welded with the inner side surface of the bearing platform part 16.
Specifically, as shown in fig. 1 to 3, the housing 1 is of an open structure at two ends, the first opening 12 is disposed at an upper end of the housing 1, the second opening 13 is disposed at a lower end of the housing 1, the bearing platform portion 16 is of a hollow annular structure, the connection portion 14, the annular portion 15 and the bearing platform portion 16 form a stepped structure, as shown in fig. 3, the connection portion 14 is disposed in an annular shape, a first width a of the connection portion 14 in an axial direction toward the columnar body 11 is greater than or equal to 1.0 mm, a height c of the annular portion 15 in the axial direction toward the columnar body 11 is greater than or equal to 0.25 mm, a second width b of the bearing platform portion 16 in the axial direction toward the columnar body 11 is greater than or equal to 1.0 mm, and a sum of the first width a of the connection portion 14 in the axial direction toward the columnar body 11 and the second width b of the bearing platform portion 16 in the axial direction toward the columnar body 11 is smaller than a radius of the columnar body 11. Specifically, for example, the diameter of the cylindrical battery is greater than 18 mm, the height is greater than 70 mm, the first width a of the connecting portion 14 in the axial direction of the cylindrical body 11 is preferably greater than or equal to 1 mm and less than or equal to 5 mm, the height c of the annular portion 15 in the axial direction of the cylindrical body 11 is preferably greater than or equal to 0.25 mm and less than or equal to 1.2 mm, and the second width b of the carrying platform portion 16 in the axial direction of the cylindrical body 11 is preferably greater than or equal to 1 mm and less than or equal to 4 mm. The positive tab 212 is of a full tab structure, the negative tab 222 is of a full tab structure, the insulating layer 34 is made of PP insulating plastic, and the bearing platform part 16 is of a certain area, so that the second current collecting disc 32 and the inner side surface of the bearing platform part 16 can be welded and connected by laser penetration welding, meanwhile, the first current collecting disc 31 and the positive tab 212 are welded and connected by laser penetration welding, the third current collecting disc 33 and the negative tab 222 are welded and connected by laser penetration welding, the small-area resistance welding is replaced by laser welding with a larger welding area, and the welding is firmer.
In the embodiment of the present invention, as shown in fig. 4 to 8, the bare cell 2 includes a cylindrical body formed by stacking and winding a positive electrode sheet 21, a separator layer and a negative electrode sheet 22, the negative electrode sheet 22 includes a negative electrode coating region 221 and a negative electrode tab 222 provided on a lower side in a width direction of the negative electrode coating region 221, the negative electrode sheet 22 is further provided with a metal region 223 integrally provided with the negative electrode coating region 221 and the negative electrode tab 222 in a length direction thereof, an upper side edge of the metal region 223 in the width direction of the negative electrode coating region 221 is higher than an upper side edge of the negative electrode coating region 221 in the width direction thereof so that the metal region 223 is located outside the bare cell 2 and forms a metal foil layer 225; the positive electrode sheet 21 includes a positive electrode coating region 211, and a positive electrode tab 212 provided on the widthwise upper side of the positive electrode coating region 211, the length of the positive electrode tab 212 being smaller than the length of the positive electrode coating region 211.
Specifically, as shown in fig. 4 to 8, arrow a and arrow B indicate the winding feeding direction and represent the front along the arrow direction, and as shown in fig. 5, the foils in the front area above the anode coating area 221 of the anode sheet 22 are all cut by laser, only part of the foils in the second tail area 224 above the anode coating area 221 is reserved, and at the same time, the foil area with a preset length behind the anode coating area 221 is reserved, so as to form a metal foil layer 225 with a required number of layers; as shown in fig. 4, a part of the foil material of the first tail area 213 above the positive electrode coating area 211 of the positive electrode sheet 21 is cut off by laser, and the side portion of the positive electrode coating area 211 and the foil material below the positive electrode sheet 21 are cut off by laser, and the length and width of the negative electrode coating area 221 are slightly larger than those of the positive electrode coating area 211, so that the powder material of the negative electrode coating area 221 can cover the powder material of the positive electrode coating area 211, and since a part of the foil material of the second tail area 224 above the negative electrode coating area 221 is reserved, and meanwhile, a foil material area with a preset length behind the negative electrode coating area 221 is reserved, the upper end surface of the metal foil layer 225 is higher than the heights of the negative electrode coating area 221 and the positive electrode coating area 211, and the part of the metal foil layer 225 exceeding the negative electrode coating area 221 and the positive electrode coating area 211 forms a connection area 2251, and a gap with a preset spacing is arranged between the positive electrode tab 212 and the metal foil layer 225. The width of the separator layer is set corresponding to the width of the anode coating area 221, and is generally 1 mm to 1.5 mm wider than the single side of the anode coating area 221, the length of the separator layer and the length of the corresponding anode coating area 221 are set, and are generally 3 mm to 5 mm longer than the anode coating area 221, of course, the specific setting of the separator layer is based on actual needs, when the bare cell 2 is wound, the anode plate 22 is positioned at the outermost side, and the separator layer and the cathode plate 21 are sequentially stacked on the anode plate 22 to form a cylinder, as shown in fig. 6 to 7; after winding, the positive electrode tab 212, the separator end 23 at the upper end of the separator layer, the negative electrode tab 222, and the connection region 2251 of the metal foil layer 225 are flattened or beaten, and the structure of the flattened or beated bare cell 2 is as shown in fig. 8, at this time, the connection region 2251 of the metal foil layer 225 is attached to the first end face of the bare cell 2, and the gap between the positive electrode tab 212 and the connection region 2251 is the flattened or beated separator end 23.
In an embodiment of the present invention, the number of layers of the metal foil layer 225 is greater than or equal to 5 and less than or equal to 15. The specific layer number is selected according to actual needs, and the electrical performance of the cylindrical battery and the size requirement of the cylindrical battery are only ensured.
In the embodiment of the present invention, as shown in fig. 10 to 15, the second current collecting plate 32 is in a hollow ring shape, the second current collecting plate 32 includes a protruding portion 321 and an edge portion 322 formed by extending from the bottom of the protruding portion 321 located at the outer side to the outer side of the protruding portion 321, the edge portion 322 is welded with the metal foil layer 225, and the top of the protruding portion 321 is welded with the inner side surface of the carrying platform portion 16. Specifically, the protruding portion 321 of the second current collecting plate 32 may be formed by bending, the second current collecting plate 32 is annular, the first current collecting plate 31 is plate-shaped, the first current collecting plate 31 has a first welding area 311 recessed toward the inner side of the cylindrical battery, the first welding area 311 may be uniformly distributed in plurality to enhance the welding effect, the first current collecting plate 31 is disposed in the middle of the second current collecting plate 32, and an insulating layer 34 is disposed between the first current collecting plate 31 and the second current collecting plate 32.
In the embodiment of the present invention, the insulating layer 34 is hollow and annular, the protruding portion 321 is fixedly connected to the outer side of the insulating layer 34, and the inner side of the insulating layer 34 is fixedly connected to the first current collecting plate 31 to form an integrally arranged composite current collecting plate. Specifically, the material of the insulating layer 34 may be specifically PP insulating plastic, and the bottom of the second current collecting disc 32 and the outer edge of the first current collecting disc 31 are injection molded with PP insulating plastic and cured with the injection molded PP insulating plastic to form a composite current collecting disc, so that the composite current collecting disc formed integrally in advance is convenient to use and install, and time can be effectively saved.
In some other embodiments, the first current collecting plate 31, the second current collecting plate 32 and the insulating layer 34 may be separately provided, and the specific arrangement is not limited, so long as insulation between the first current collecting plate 31 and the second current collecting plate 32 is ensured.
In the embodiment of the present invention, as shown in fig. 16 to 19, the cylindrical battery further includes a cover plate assembly, the cover plate assembly includes an upper cover plate 41 and a bottom welding tab 42, the edge of the upper cover plate 41 is lapped on the carrying platform portion 16 and seals the first opening 12, the bottom welding tab 42 seals the second opening 13, and an explosion-proof portion 421 is provided on the bottom welding tab 42. Specifically, be equipped with utmost point post 411 on upper cover plate 41, be provided with sealing washer 412 between utmost point post 411 and the upper cover plate 41, upper cover plate 41 corresponds the edge of loading platform portion 16 still is provided with first step portion 414 in order to realize the radial spacing of upper cover plate 41, so that the connection between upper cover plate 41 and the casing 1 is more firm, the top of first current collection dish 31 still is provided with insulating gasket 413, insulating gasket 413 is the type of falling U, insulating gasket 413 includes the tank bottom and the cell wall of being connected with the tank bottom, the cell wall supports and presses on the upper side of insulating layer 34, tank bottom and upper cover plate 41 butt are in order to be used for spacing naked electric core 2, the dodging mouthful is seted up at the middle part of tank bottom in order to form dodging the position of utmost point post 411 installation. Through the use of the insulating gasket 413 to further limit the position in the axial direction of the bare cell 2, the influence of the axial movement of the bare cell 2 on the welding effect of the bare cell 2 and the shell 1 is avoided, the connection between the upper cover plate 41 and the shell 1 can be connected in a laser penetration welding manner through the connection between the upper cover plate 41 and the outer side surface of the bearing platform part 16 facing the outer side, the connection between the upper cover plate 41 and the shell 1 can also be connected in a laser seam welding manner through the upper cover plate 41 and the annular part 15, and the periphery of the bottom welding lug 42 is provided with a second step part 422 in welded connection with the lower end of the shell 1.
In the embodiment of the invention, when the shell 1 is a steel shell, the metal foil layer 225 is a copper foil layer, the negative electrode lug 222 is a copper foil full-tab, and the positive electrode lug 212 is an aluminum foil full-tab.
In some other embodiments of the present invention, when the case 1 is an aluminum case, the polarity is reversed, i.e. the metal foil layer 225 is an aluminum foil layer, the negative tab 222 is then an aluminum foil full tab, and the positive tab 212 is then a copper foil full tab.
According to the embodiment of the invention, the anode lug 212 and the cathode lug 222 are arranged at two ends of the bare cell 2 of the cylindrical battery, a multi-layer copper foil structure is arranged at the outer side, the cathode lug 222 at the second end of the bottom of the bare cell 2 is welded with the third current collecting disc 33 by laser, the second current collecting disc at the outer side of the composite current collecting disc is respectively connected with the outer metal foil layer 225 by laser welding, the top of the protruding part 321 of the second current collecting disc 32 is welded with the inner side surface of the bearing platform part 16 by laser, the first current collecting disc 31 at the inner side of the composite current collecting disc is connected with the anode lug 212 by laser welding, the first current collecting disc 31 and the second current collecting disc 32 are isolated and insulated by adopting the insulating layer 34 made of PP insulating plastic, the same end of the anode and the cathode of the bare cell 2 is finally realized, the resistance of the shell 1 is avoided by using ultrasonic welding or laser welding with larger welding area to replace resistance welding with smaller welding area, the battery resistance is reduced, the battery resistance is realized, the safety valve function can be implemented on the bottom welding sheet 42, the high-rate performance, the charge-discharge temperature rise, the safety and the like of the cylindrical power battery are improved.
The above is an explanation of the structure of the cylindrical battery according to the embodiment of the present invention, and the embodiment of the present invention further provides an assembly method of the cylindrical battery, including the following steps:
s1, providing a bare cell 2, wherein the bare cell 2 is provided with a first end and a second end opposite to the first end, the first end of the bare cell 2 is provided with a positive electrode lug 212, the second end of the bare cell 2 is provided with a negative electrode lug 222, the periphery of the bare cell 2 is also provided with a metal foil layer 225 electrically connected with the negative electrode lug 222, and the metal foil layer 225 extends to the end face of the first end of the bare cell 1, is arranged around the periphery of the positive electrode lug 212 and is arranged at a distance from the positive electrode lug 212; specifically, the structure of the bare cell 2 is as described above, and the positive electrode tab 212, the negative electrode tab 222, and the metal foil layer 225 of the bare cell 2 are flattened or beaten; specifically, as shown in fig. 6 and 8, after the positive electrode sheet 21, the separator layer, and the negative electrode sheet 22 are stacked and wound to form a cylinder, the positive electrode tab 212 in the middle of the upper end of the bare cell 2 is flattened or beaten, and the negative electrode tab 222 and the separator layer are flattened or beaten.
S2, providing a current collecting disc, wherein the current collecting disc comprises a first current collecting disc 31 for connecting with the positive electrode lug 212, a second current collecting disc 32 for connecting with a metal foil layer 225 positioned on the first end face of the bare cell 2, and a third current collecting disc 33 for connecting with the negative electrode lug 222; the negative electrode lug 222 of the bare cell 2 is connected with the third current collecting disc 33; specifically, as shown in fig. 9 and fig. 12 to 13, the third current collecting plate 33 is in a plate shape, the third current collecting plate 33 has a second welding area 331 protruding toward the inner side of the cylindrical battery, the second welding area 331 may be a plurality of evenly distributed to enhance the welding effect, and the anode tab 222 may be welded to the second welding area 331 of the third current collecting plate 33 by laser penetration welding, and the specific structures of the first current collecting plate 31 and the second current collecting plate 32 are as shown above, which are not described herein again.
S3, connecting the positive electrode lug 212 of the bare cell 2 with a first current collecting disc 31, connecting a metal foil layer 225 positioned on the first end face of the bare cell 2 with a second current collecting disc 32, and arranging an insulating layer 34 between the first current collecting disc 31 and the second current collecting disc 32; specifically, as shown in fig. 10 to 13, the positive electrode tab 212 and the first current collecting plate 31 may be welded and fixed, and the metal foil layer 225 located on the end surface of the first end of the bare cell 2 and the second current collecting plate 32 may be welded and fixed, respectively, by laser penetration welding.
S4, providing a shell 1, mounting the bare cell 2 in the shell 1, wherein the positive electrode lug 212, the first current collecting disc 31 and the second current collecting disc 32 are positioned at the first opening 12, and the negative electrode lug 222 and the third current collecting disc 33 are positioned at the second opening 13; specifically, as shown in fig. 14 to 15, the bare cell 2 is mounted inside the case 1 through the second opening 13 of the case 1, the positive tab 212 is located at the upper end, and the negative tab 222 is located at the lower end.
And S5, supporting the second end of the bare cell 2 by adopting a clamp and welding and connecting the second current collecting disc 32 with the inner side surface of the bearing platform part 16.
In the embodiment of the present invention, as shown in fig. 9 to 13, the second current collecting plate 32 is in a hollow ring shape, the second current collecting plate 32 includes a protruding portion 321 and an edge portion 322 formed by extending from a bottom of the protruding portion 321 located at the outer side to the outer side of the protruding portion 321, the specific structure of the second current collecting plate 32 is as above, and the step S3 of connecting the metal foil layer 225 located on the first end face of the bare cell 2 with the second current collecting plate 32 includes:
s31, welding and connecting a metal foil layer 225 positioned on the first end face of the bare cell 2 with an edge part 322; and
in step S5, the step of welding and connecting the second current collecting plate 32 to the inner side surface of the platform portion 16 includes:
and S51, welding and connecting the top of the protruding part 321 with the inner side surface of the bearing platform part 16 by adopting a laser penetration welding mode.
In the embodiment of the present invention, after the step of using the fixture to prop up the second end of the bare cell 2 and weld and connect the second current collecting disc 32 with the inner side surface of the bearing platform portion 16 in the step S5, the method further includes the following steps:
s6, providing a cover plate assembly, wherein the cover plate assembly comprises an upper cover plate 41 and a bottom welding lug 42, and a pole 411 is arranged in the middle of the upper cover plate 41; specifically, as shown in fig. 16 to 19, a pole 411 is disposed on the upper cover plate 41, a first step portion 414 is further disposed on an edge of the upper cover plate 41 corresponding to the bearing platform portion 16 to achieve radial limiting of the upper cover plate 41, so that connection between the upper cover plate 41 and the housing 1 is firmer, an insulating gasket 413 is further disposed above the first current collecting disc 31, the insulating gasket 413 is in an inverted U shape, the insulating gasket 413 includes a groove bottom and a groove wall connected with the groove bottom, the groove wall is pressed against an upper side surface of the insulating layer 34, the groove bottom is abutted to the upper cover plate 41 to be used for limiting the bare cell 2, and an avoidance port is formed in the middle of the groove bottom to form an avoidance position for mounting the pole 411.
S7, closing the second opening 13 by adopting a bottom soldering lug 42; specifically, as shown in fig. 16 to 19, an explosion-proof portion 421 is provided on the bottom tab 42, and a second step portion 422 is provided on the edge of the bottom tab 42 to be fitted to the other end portion of the case 1, and laser seam welding is performed by the side connecting seam.
S8, the edge of the upper cover plate 41 is arranged on the bearing platform part 16, and the upper cover plate 41 is used for sealing the first opening 12; specifically, as shown in fig. 16 to 19, the upper cover 41 is set up on the carrying platform portion 16 and limited by the first step portion 414, specifically, the connection between the upper cover 41 and the housing 1 may be connected by laser penetration welding between the upper cover 41 and the outer side surface facing the outer side on the carrying platform portion 16, and the connection between the upper cover 41 and the housing 1 may also be connected by laser seam welding between the upper cover 41 and the annular portion 15.
And S9, a liquid injection hole is formed in the middle of the bottom welding lug 42, a clamp is adopted to penetrate through the liquid injection hole and prop against the middle position of the first current collecting disc 31, and the pole 411 and the first current collecting disc 31 are fixedly connected by laser penetration welding.
S10, filling the liquid Kong Zhuye, and sealing the liquid filling hole by adopting a sealing nail.
The foregoing disclosure is merely illustrative of the principles of the present invention, and thus, it is intended that the scope of the invention be limited thereto and not by this disclosure, but by the claims appended hereto.
Claims (10)
1. A cylindrical battery, comprising:
the shell comprises a columnar main body, wherein the columnar main body is of a hollow structure, a first opening is formed in one end of the columnar main body, a second opening is formed in the other end of the columnar main body, one end of the columnar main body extends into the first opening to form a connecting part, the connecting part is bent towards the second opening to form an annular part, and the annular part is bent towards the axis direction of the columnar main body to form a bearing platform part;
the bare cell is arranged in the shell, the bare cell is provided with a first end and a second end opposite to the first end, the first end of the bare cell is provided with a positive electrode lug, the second end of the bare cell is provided with a negative electrode lug, the periphery of the bare cell is also provided with a metal foil layer electrically connected with the negative electrode lug, and the metal foil layer extends to the end face of the first end of the bare cell, is enclosed on the periphery of the positive electrode lug and is arranged at intervals with the positive electrode lug;
the current collecting disc comprises a first current collecting disc connected with the positive electrode lug, a second current collecting disc connected with the metal foil layer on the end face of the first end of the bare cell and a third current collecting disc connected with the negative electrode lug, wherein the first current collecting disc and the second current collecting disc are both positioned at the first end of the bare cell, an insulating layer is arranged between the first current collecting disc and the second current collecting disc, and the second current collecting disc is positioned at the inner side of the bearing platform part and is welded and connected with the inner side face of the bearing platform part.
2. The cylindrical battery according to claim 1, wherein the bare cell includes a cylindrical body formed by stacking and winding a positive electrode sheet, a separator layer, and a negative electrode sheet, the negative electrode sheet including a negative electrode coating region and the negative electrode tab provided on a lower side in a width direction of the negative electrode coating region, the negative electrode sheet further being provided in a length direction thereof with a metal region integrally provided with the negative electrode coating region and the negative electrode tab, an upper side edge of the metal region in the width direction of the negative electrode coating region being higher than an upper side edge of the negative electrode coating region in the width direction thereof so that the metal region is located outside the bare cell and forms the metal foil layer; the positive plate comprises a positive electrode coating region and a positive electrode lug arranged on the upper side of the positive electrode coating region in the width direction, and the length of the positive electrode lug is smaller than that of the positive electrode coating region.
3. The cylindrical battery of claim 1, wherein the number of metal foil layers is greater than or equal to 5 and less than or equal to 15.
4. The cylindrical battery of claim 1, wherein the second current collecting plate is hollow and annular, the second current collecting plate comprises a protruding portion and an edge portion formed by extending the bottom of the protruding portion located at the outer side to the outer side of the protruding portion, the edge portion is welded with the metal foil layer, and the top of the protruding portion is welded with the inner side surface of the bearing platform portion.
5. The cylindrical battery according to claim 4, wherein the insulating layer is hollow and annular, the protruding portion is fixedly connected to the outer side of the insulating layer, and the inner side of the insulating layer is fixedly connected to the first current collecting plate to form an integrally provided composite current collecting plate.
6. The cylindrical battery of claim 1, further comprising a cover plate assembly comprising an upper cover plate and a bottom tab, wherein an edge of the upper cover plate is erected on the load-bearing platform portion and closes the first opening, wherein the bottom tab closes the second opening and wherein the bottom tab is provided with an explosion-proof portion.
7. The cylindrical battery according to claim 1, wherein when the case is a steel case, the metal foil layer is a copper foil layer, the negative electrode tab is a copper foil full tab, and the positive electrode tab is an aluminum foil full tab; or (b)
When the shell is an aluminum shell, the metal foil layer is an aluminum foil layer, the negative electrode lug is an aluminum foil full electrode lug, and the positive electrode lug is a copper foil full electrode lug.
8. A method of assembling a cylindrical battery as claimed in any one of claims 1 to 7, comprising the steps of:
providing a bare cell, wherein the bare cell is provided with a first end and a second end opposite to the first end, the first end of the bare cell is provided with a positive electrode lug, the second end of the bare cell is provided with a negative electrode lug, the periphery of the bare cell is also provided with a metal foil layer electrically connected with the negative electrode lug, and the metal foil layer extends to the end face of the first end of the bare cell, is arranged around the periphery of the positive electrode lug and is arranged at a distance from the positive electrode lug;
providing a current collecting disc, wherein the current collecting disc comprises a first current collecting disc used for being connected with the positive electrode lug, a second current collecting disc used for being connected with the metal foil layer positioned on the first end face of the bare cell, and a third current collecting disc used for being connected with the negative electrode lug, and the negative electrode lug of the bare cell is connected with the third current collecting disc;
connecting the positive electrode lug of the bare cell with the first current collecting disc, connecting the metal foil layer positioned on the first end face of the bare cell with the second current collecting disc, and arranging an insulating layer between the first current collecting disc and the second current collecting disc;
the method comprises the steps that a shell is provided, the shell comprises a columnar main body, the columnar main body is of a hollow structure, a first opening is formed in one end of the columnar main body, a second opening is formed in the other end of the columnar main body, one end of the columnar main body extends into the first opening to form a connecting part, the connecting part is bent towards the second opening to form an annular part, the annular part is bent towards the axis direction of the columnar main body to form a bearing platform part, a bare cell is mounted in the shell, the positive electrode lug, the first current collecting disc and the second current collecting disc are located at the first opening, and the negative electrode lug and the third current collecting disc are located at the second opening;
and pushing the second end of the bare cell by adopting a clamp, and welding and connecting the second current collecting disc with the inner side surface of the bearing platform part.
9. The method of assembling a cylindrical battery according to claim 8, wherein the second current collecting plate has a hollow ring shape, the second current collecting plate includes a convex portion and an edge portion formed by extending a bottom portion of the convex portion located outside to an outside of the convex portion, and the step of connecting the metal foil layer located on the first end face of the bare cell to the second current collecting plate includes:
welding the metal foil layer positioned on the first end face of the bare cell with the edge part; and
the step of connecting the second collecting tray with the inner side surface of the bearing platform part comprises the following steps:
and welding the top of the protruding part with the inner side surface of the bearing platform part in a laser penetration welding mode.
10. The method of assembling a cylindrical battery according to claim 8, further comprising, after the step of abutting the second end of the bare cell with a jig and welding the second current collecting plate to the inner side surface of the load-bearing platform portion, the steps of:
providing a cover plate assembly, wherein the cover plate assembly comprises an upper cover plate and a bottom welding lug, and a pole is arranged in the middle of the upper cover plate;
closing the second opening with the bottom tab;
the edge of the upper cover plate is erected on the bearing platform part, and the upper cover plate is utilized to close the first opening;
a liquid injection hole is formed in the middle of the bottom welding lug, a clamp penetrates through the liquid injection hole and props against the middle of the first current collecting disc so as to fix the pole and the first current collecting disc by laser penetration welding;
the liquid injection hole is sealed by the liquid injection Kong Zhuye and a sealing nail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311390604.7A CN117374486A (en) | 2023-10-24 | 2023-10-24 | Cylindrical battery and method for assembling the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311390604.7A CN117374486A (en) | 2023-10-24 | 2023-10-24 | Cylindrical battery and method for assembling the same |
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| CN202311390604.7A Pending CN117374486A (en) | 2023-10-24 | 2023-10-24 | Cylindrical battery and method for assembling the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119674368A (en) * | 2024-11-25 | 2025-03-21 | 东莞市创明电池技术有限公司 | Power battery |
| WO2025148501A1 (en) * | 2024-01-10 | 2025-07-17 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, and electrical device |
-
2023
- 2023-10-24 CN CN202311390604.7A patent/CN117374486A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025148501A1 (en) * | 2024-01-10 | 2025-07-17 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, and electrical device |
| CN119674368A (en) * | 2024-11-25 | 2025-03-21 | 东莞市创明电池技术有限公司 | Power battery |
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