CN112599935A - Lithium ion power soft package battery tab and manufacturing method of battery - Google Patents
Lithium ion power soft package battery tab and manufacturing method of battery Download PDFInfo
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- CN112599935A CN112599935A CN202011467641.XA CN202011467641A CN112599935A CN 112599935 A CN112599935 A CN 112599935A CN 202011467641 A CN202011467641 A CN 202011467641A CN 112599935 A CN112599935 A CN 112599935A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 72
- 239000011888 foil Substances 0.000 claims abstract description 67
- 238000005452 bending Methods 0.000 claims abstract description 27
- 239000004033 plastic Substances 0.000 claims abstract description 13
- 229920003023 plastic Polymers 0.000 claims abstract description 13
- 239000002390 adhesive tape Substances 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims description 21
- 239000003292 glue Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000005253 cladding Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000004806 packaging method and process Methods 0.000 abstract description 14
- 238000003475 lamination Methods 0.000 abstract description 4
- 238000001192 hot extrusion Methods 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 239000002985 plastic film Substances 0.000 description 7
- 229920006255 plastic film Polymers 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
Abstract
The invention provides a manufacturing method of a lithium ion power soft package battery tab and a battery, which comprises the steps of firstly stacking and wrapping a positive plate, a negative plate and a diaphragm in a lamination/winding mode to form a core package, welding and forming a foil reserved at the end part by using an offset welding mode, then cutting the foil, then welding an L-shaped tab and the foil together by main welding, then pasting a protective adhesive tape, placing a plastic gasket, bending the foil, and then putting the foil into a shell for hot extrusion packaging to finish battery assembly. According to the manufacturing method of the lithium ion power soft package battery tab and the battery, the space length of the welding area is reduced on the premise that the main body and the packaging area of the battery are not changed, so that the length of the battery is reduced, and the volume energy density of the battery is improved.
Description
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to a lithium ion power soft package battery tab and a manufacturing method of a battery.
Background
The lithium ion power soft package battery is generally structurally composed of a core package, a tab, a protective adhesive tape, an aluminum plastic film and the like. Firstly, stacking and wrapping the positive plate, the negative plate and the diaphragm in a lamination/winding mode to form a core package, welding and forming the foil reserved at the end part by pre-welding (ultrasonic welding), then cutting the foil (enabling the end surface of the foil to be neat and facilitating main welding), then performing main welding (welding the lug on the foil by ultrasonic/laser), and finally performing hot extrusion packaging to complete battery assembly. The battery structure was analyzed, and the length thereof was defined as the battery body length + the soldering region length × 2+ the package region length × 2. Wherein the body length is dependent on the battery capacity/energy design; the length of the packaging area depends on the requirement of packaging strength; the length of the welding area is used for connecting the main body and the packaging area. For example, a VDA310 type cell has a single side weld zone of about 8mm space length and 16mm total sides. Under the currently generally adopted process method, all connections of the welding part of the battery in the length direction are horizontal connections, and the required length space is large. The volume of the existing battery is large, the energy storage is small, and the volume energy density of the battery is small.
Disclosure of Invention
In view of this, the invention aims to provide a lithium ion power soft package battery tab to solve the problem that the volume energy density of the existing battery is small.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a lithium ion power laminate polymer battery utmost point ear, includes that substrate and utmost point ear glue, and the substrate is planar structure, and the middle part of the tow sides of substrate is compound one deck or multilayer utmost point ear glue respectively, and one side of substrate is bent and is formed utmost point ear welding area territory for the substrate is L type structure.
Furthermore, the tab glue is made of PP material.
Furthermore, the distance between the bending starting position and the edge of the tab glue is 1-1.5 mm.
Compared with the prior art, the lithium ion power soft package battery tab has the following advantages:
(1) the lithium ion power soft package battery tab reduces the space length of the welding area on the premise of not changing the main body and the packaging area of the battery, thereby reducing the length of the battery and improving the volume energy density of the battery.
The invention also aims to provide a manufacturing method of the lithium ion power soft package battery, so as to solve the problems of large battery volume, small energy storage and small battery volume energy density.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a manufacturing method of a lithium ion power soft package battery comprises the following steps:
s1, forming a core package by winding or laminating pole pieces and diaphragms required by the battery, wherein the end part of the core package is made of a foil material;
s2, prewelding the foil at the end of the core bag by adopting an offset welding method;
s3, cutting off redundant foil;
s4, welding the tabs to the foil at the end of the core bag;
s5, bending the foil to enable the large surface of the tab to be changed from vertical to horizontal;
s6, putting the core package processed in the step S5 into a battery shell;
and S7, performing heat sealing on the core package and the to-be-sealed part of the battery shell to complete battery assembly.
Further, the "off-side welding" method in step S2 specifically includes: when in welding, the foil is integrally pressed to be parallel to the foil at the bottom edge by the welding head or the pressing mechanism, and then welding is carried out.
Further, the specific method of step S4 is as follows: and welding the L-shaped tab on the core cladding foil by an ultrasonic welding or laser welding process.
Further, after the tab in step S4 is welded to the foil, an adhesive tape is attached to the outside of the welding surface, and the adhesive tape is wrapped around the edge of the tab.
Further, before the foil is bent in step S5, a plastic pad is placed at a portion of the foil to be bent.
Further, the specific process of bending the foil in step S5 is as follows: the bending roller is pushed to the bending position through the air cylinder, and the foil is bent by taking the bending roller as a reference point, so that the large surface of the tab is changed from vertical to horizontal.
Compared with the prior art, the manufacturing method of the lithium ion power soft package battery has the following advantages:
(1) the manufacturing method of the lithium ion power soft package battery comprises the steps of firstly stacking and wrapping a positive plate, a negative plate and a diaphragm in a lamination/winding mode to form a core package, welding and forming foil reserved at the end part by using 'side welding', then cutting the foil, welding an 'L-shaped' tab and the foil together by main welding, then pasting a protective tape, placing a plastic gasket, bending the foil, then putting the foil into a shell for hot extrusion packaging, completing battery assembly, and reducing the space length of a welding area on the premise of not changing a battery main body and a packaging area, so that the length of the battery is reduced, and the volume energy density of the battery is improved.
(2) The manufacturing method of the lithium ion power soft package battery adopts the 'side welding' method, and can effectively ensure that the large surface of the tab and the packaging surface can still keep the same plane.
(3) According to the manufacturing method of the lithium ion power soft package battery, the adhesive tape is pasted outside the welding surface, the edges of the tabs are wrapped by the adhesive tape, the aluminum plastic film is physically isolated from the metal sheets of the positive and negative tabs, and the aluminum plastic film is effectively protected.
(4) The manufacturing method of the lithium ion power soft package battery comprises the steps of placing a plastic gasket at a part of a foil to be bent; the internal structure of the battery can be effectively supported and the core package can be protected.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a tab structure in the prior art;
fig. 2 is a schematic diagram of a tab of a lithium-ion power soft package battery according to an embodiment of the invention;
FIG. 3 is a schematic illustration of an off-side weld according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an L-shaped tab battery according to an embodiment of the present invention before being bent;
fig. 5 is a schematic view of an L-shaped tab battery according to an embodiment of the present invention after being bent;
fig. 6 is a schematic structural diagram of a lithium-ion power soft package battery according to an embodiment of the invention;
fig. 7 is a cross-sectional view of a lithium-ion power soft package battery according to an embodiment of the invention;
fig. 8 is an enlarged view of a portion a in fig. 7.
Description of reference numerals:
1-a substrate; 2, pole lug glue; 3-tab welding area; 4-a separator; 5, positive plate; 6-negative pole piece; 7-foil material; 8-mounting a plastic compaction block; 9-lower plastic compression block, 10-welding area; 11-foil cutting area; 12-bending rolls; 13-L type pole ear; 14-a core pack body; 15-bending direction; 16-shell.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The utility model provides a lithium ion power laminate polymer battery utmost point ear, as shown in figure 2, glues 2 including substrate 1 and utmost point ear, and substrate 1 is planar structure, and the middle part of the tow sides of substrate 1 compounds one deck or multilayer utmost point ear respectively and glues 2, and one side of substrate 1 is bent and is formed utmost point ear welding area territory 3 for substrate 1 is L type structure.
The tab glue 2 is made of PP material; the thickness range of the tab glue 2 is 0.1-0.2 mm, the width is 8-12 mm, and the length of the tab glue 2 is 6-10 mm greater than that of the base material 1; the edge of the tab glue 2 is 6mm away from the edge of the substrate 1.
The substrate 1 is a metal sheet, and in one or more embodiments, the material of the metal sheet is aluminum or copper-plated nickel, and the thickness of the metal sheet is generally 0.2 to 0.6 mm.
The angle of bending is 90 +/-5 degrees, the radius of bending is 0.5-1 mm, the structural strength of the base material 1 is not affected after the tab is bent, the distance between the bending initial position and the edge of the tab glue 2 is 1-1.5 mm, and the connection strength of the tab glue 2 and the base material 1 is not affected after the tab is bent.
As shown in fig. 1 and 2, in the L-shaped tab structure, the welding area is changed from "horizontal" to "vertical" and "the length is changed by thickness", in one or more embodiments, the edge of the tab glue 2 is 6mm away from the edge of the substrate 1, the distance between the tab glue 2 and the initial position of bending is 1.2mm, and the bending radius is 0.8mm, so that the length of the bent substrate 1 is reduced by 4mm, the spatial length of the tab welding area 3 is reduced by about 4mm on one side, and the overall battery length is reduced by about 8mm (on one side, i.e., "positive side or negative side", and on both sides, i.e., "positive side + negative side"); taking a VDA310 type battery as an example, the length is reduced from 309 to 301mm, and the volumetric energy density is improved by about 2.7%, which is calculated as follows:
the energy density increase ratio is E/x y 301/(E/x y 309) -1, where E is the cell energy, x is the cell thickness, y is the cell width, and 301 and 309 are both the cell length. Substituting the specific numerical values into the formula, wherein x is equal to 11, y is equal to 100, and calculating the following process: the energy density increase ratio is E/11 × 100 × 301/(E/11 × 100 × 309) -1 ≈ 2.7%.
A method for manufacturing a lithium ion power soft package battery, as shown in fig. 6 and 7, includes the following steps:
s1, forming a core package by winding or laminating pole pieces and diaphragms required by the battery, wherein the end part of the core package is made of a foil material;
the specific method for winding to form the core package comprises the following steps: the negative plate, the diaphragm and the positive plate are stacked in sequence by using a winding machine, and the ending adhesive tape is pasted after the negative plate, the diaphragm and the positive plate rotate for a certain number of turns (the number of the rotation turns is selected according to the actual requirement of the battery), so that a core package is formed, the end part of the core package is made of foil, and the positive pole lug and the negative pole lug are both L-shaped lug structures.
The specific method for forming the core package by the lamination comprises the following steps: the battery core package is characterized in that the battery core package is formed by stacking a diaphragm, a negative plate, a diaphragm, a positive plate, a diaphragm and a negative plate … … in sequence, sticking a termination adhesive tape after a certain number of layers is achieved (the number of layers is selected according to the actual requirement of the battery), and forming a core package (the end part is made of a positive foil and a negative foil), as shown in fig. 3, wherein the positive tab and the negative tab are both in an L-shaped tab structure.
S2, prewelding the foil at the end of the core bag by adopting an offset welding method;
as shown in fig. 3, the structure of the welding part is schematic, and only the negative electrode side is shown, and the positive electrode side is aluminum foil, and the structure is similar to that; in fig. 3, from top to bottom, there are sequentially a separator 4, a negative plate 6 (dark black horizontal line in the figure), a separator 4, a positive plate 5 (light horizontal line in the figure, and short length), a separator 4, etc., and the top of each negative plate is a reserved optical foil (no active material), a welding area 10 is formed on the right side of a plurality of foils 7, and the "off-side welding" method specifically includes: during welding, the foil 7 is integrally pressed to be parallel to the bottom edge foil 7 through a welding head or a pressing mechanism (a group of air cylinder and plastic pressing block mechanisms are respectively arranged at the positive positions above and below the welding area 10, and the air cylinders respectively push the upper plastic pressing block 8 and the lower plastic pressing block 9 to be pressed oppositely), and then welding is carried out, so that the foil is guaranteed to be bent to have enough space on the next step. The large surface (namely the plane of the substrate 1) of the tab and the packaging surface can be effectively ensured to be kept on the same plane.
The current commonly used welding structure of the foil material at the end part of the core cladding is 'middle symmetrical welding', and the purpose of the welding structure is to ensure that a lug and a packaging surface are in the same plane when the core cladding enters a shell subsequently. And during welding, the foil is pressed to the middle layer through the welding head or the pressing mechanism, and then welding is performed.
S3, cutting redundant foil;
as shown in fig. 3, the excess foil portion is cut away in the foil cutting area 11 to the right of the welding area 10 using a cutter, preferably a high hardness die steel, to facilitate subsequent welding.
S4, carrying out primary welding on the tabs;
and welding the L-shaped tab 13 on the core cladding foil material in the tab welding area through ultrasonic welding or laser welding.
S5, pasting an adhesive tape on the outside of the welding surface, and enabling the adhesive tape to wrap the edge of the tab;
to utmost point ear edge and plastic-aluminum membrane contact position, paste the protection sticky tape outside the face of weld to wrap up utmost point ear edge, preferred, the sticky tape is the PET sticky tape, and thickness is 30 ~ 50 um. The function of protecting the aluminum-plastic film is achieved, namely the aluminum-plastic film is physically isolated from the metal sheets of the anode lug and the cathode lug.
S6, placing a plastic gasket at the part of the foil to be bent;
and (3) aiming at the gap between the bent foil and the top of the core bag, arranging a plastic gasket at the part of the foil to be bent, preferably, the plastic gasket is made of high-temperature-resistant and corrosion-resistant materials such as PE (polyethylene) and has the thickness of 0.5-1 mm, and plays a role in structural support and protection.
S7, bending the foil;
as shown in fig. 4 and 5, the specific process of bending the foil is as follows: the bending roller 12 with the outer diameter of 0.5mm is pushed to the bending position of the core cladding main body 14 through the air cylinder, the foil 7 is bent by taking the bending roller 12 as a reference point, the part of the foil 7 is bent by 90 degrees, the bending radius is 0.25-0.5 mm, and the large surface of the L-shaped tab 13 is changed from vertical to horizontal.
S8, placing the processed core package into a battery shell;
the battery shell is an aluminum plastic film packaging shell.
And S9, performing heat sealing on the core package and the to-be-packaged part of the battery to complete battery assembly.
And (2) extruding the parts to be packaged together through a heat sealing head (usually special alloy die steel or copper materials) by using packaging equipment, and maintaining at a high temperature (170-210 ℃) for several seconds to melt and bond the PP layer and the tab glue layer of the aluminum plastic film of the parts to be packaged together.
This scheme designs "L type" utmost point ear, reduces welding area's space length under the prerequisite that does not change battery main part and encapsulation area to reduce battery length, promote the volume energy density of battery.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a lithium ion power laminate polymer battery utmost point ear which characterized in that: the tab welding structure comprises a substrate and tab glue, wherein the substrate is of a planar structure, one or more layers of tab glue are compounded at the middle parts of the front surface and the back surface of the substrate respectively, and one side of the substrate is bent to form a tab welding area, so that the substrate is of an L-shaped structure.
2. The lithium ion power soft package battery tab according to claim 1, characterized in that: the tab glue is made of PP material.
3. The lithium ion power soft package battery tab according to claim 1, characterized in that: the distance between the bending starting position and the edge of the tab glue is 1-1.5 mm.
4. The manufacturing method of the lithium ion power soft package battery is characterized by comprising the following steps:
s1, forming a core package by winding or laminating pole pieces and diaphragms required by the battery, wherein the end part of the core package is made of a foil material;
s2, prewelding the foil at the end of the core bag by adopting an offset welding method;
s3, cutting off redundant foil;
s4, welding the tabs to the foil at the end of the core bag;
s5, bending the foil to enable the large surface of the tab to be changed from vertical to horizontal;
s6, putting the core package processed in the step S5 into a battery shell;
and S7, performing heat sealing on the core package and the to-be-sealed part of the battery shell to complete battery assembly.
5. The manufacturing method of the lithium ion power soft package battery according to claim 4, characterized in that: the "offset welding" method in step S2 specifically includes: when in welding, the foil is integrally pressed to be parallel to the foil at the bottom edge by the welding head or the pressing mechanism, and then welding is carried out.
6. The manufacturing method of the lithium ion power soft package battery according to claim 4, characterized in that: the specific method of step S4 is as follows: and welding the L-shaped tab on the core cladding foil by an ultrasonic welding or laser welding process.
7. The manufacturing method of the lithium ion power soft package battery according to claim 4, characterized in that: and (4) after the tab in the step (S4) is welded on the foil, sticking an adhesive tape on the outside of the welding surface, and enabling the adhesive tape to wrap the edge of the tab.
8. The manufacturing method of the lithium-ion power soft package battery according to claim 4 or 7, characterized in that: before the foil is bent in step S5, plastic spacers are placed on the portions of the foil to be bent.
9. The manufacturing method of the lithium ion power soft package battery according to claim 4, characterized in that: the specific process of bending the foil in step S5 is as follows: the bending roller is pushed to the bending position through the air cylinder, and the foil is bent by taking the bending roller as a reference point, so that the large surface of the tab is changed from vertical to horizontal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381131A (en) * | 2021-05-27 | 2021-09-10 | 万向一二三股份公司 | Method for improving fracture of lithium ion battery tab foil |
| CN113451712A (en) * | 2021-07-29 | 2021-09-28 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| CN114367554A (en) * | 2021-12-04 | 2022-04-19 | 万向一二三股份公司 | Power battery current collector tab shaping method and battery thereof |
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| CN113381131A (en) * | 2021-05-27 | 2021-09-10 | 万向一二三股份公司 | Method for improving fracture of lithium ion battery tab foil |
| CN113381131B (en) * | 2021-05-27 | 2022-09-02 | 万向一二三股份公司 | Method for improving fracture of lithium ion battery tab foil |
| CN113451712A (en) * | 2021-07-29 | 2021-09-28 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| CN113451712B (en) * | 2021-07-29 | 2024-04-09 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| CN114367554A (en) * | 2021-12-04 | 2022-04-19 | 万向一二三股份公司 | Power battery current collector tab shaping method and battery thereof |
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Application publication date: 20210402 |