CN114744376A - Dislocation tab welding method for reducing foil waste and improving welding yield - Google Patents
Dislocation tab welding method for reducing foil waste and improving welding yield Download PDFInfo
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- CN114744376A CN114744376A CN202210544267.1A CN202210544267A CN114744376A CN 114744376 A CN114744376 A CN 114744376A CN 202210544267 A CN202210544267 A CN 202210544267A CN 114744376 A CN114744376 A CN 114744376A
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- 238000003466 welding Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000011888 foil Substances 0.000 title claims abstract description 22
- 239000002699 waste material Substances 0.000 title claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 202
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 238000003475 lamination Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000004080 punching Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims 1
- 238000005457 optimization Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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- 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- 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
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- 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
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- General Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a dislocation tab welding method for reducing foil waste and improving welding yield, which comprises the following steps: the method comprises the following steps of: s1, calculation in the early stage: designing the total winding core size and the number of layers of battery core pole pieces according to the capacity and size of a designed battery and the positive and negative characteristics of a battery material, equally grouping the battery pole pieces according to the number of layers of the battery core pole pieces, dividing the battery pole pieces into an A-type winding core, a B-type winding core and a C-type winding core, and designing the positions of lugs on the positive and negative pole pieces in the A-type winding core, the B-type winding core and the C-type winding core so as to ensure that the lug positions in the upper and lower adjacent winding core groups are arranged in a staggered manner; then coating by S2; s3, punching; s4, lamination: s5, after the detection process, a class A winding core, a class B winding core and a class C winding core are manufactured, the method divides the winding cores in the same battery into a plurality of winding cores with proper thickness by carrying out tab dislocation, and welds the tabs of the winding cores by adopting specially-made positive and negative tab connecting sheets.
Description
Technical Field
The invention belongs to the technical field of new energy batteries, and particularly relates to a dislocation tab welding method for reducing foil waste and improving welding yield.
Background
In recent years, the lithium battery industry is rapidly developed, and the market share is gradually increased; the lithium ion battery can be divided into a winding type and a lamination type according to different core making.
The core that rolls up that adopts the preparation of lamination formula at present piles up through using positive, negative pole piece to add the diaphragm and make, specifically is: the laminated battery core is characterized in that negative plates, diaphragms, positive plates, diaphragms and negative plates … are stacked layer by layer, a stacked winding core is shown in figure 1, the stacked winding core is welded with a cover plate after simple treatment, tabs are firstly gathered in the middle of the winding core for prewelding during welding, the capacity requirement of the battery is increased along with market demands, the thickness of the winding core is increased, the height of the tabs is enough for welding the tabs on the outer side, gap type coating is mainly used in the pole piece coating mode of the laminated battery core at present, and the coating gap is increased when the tabs are high.
The foils (anode aluminum foil and cathode copper foil) at the tab gap part can not be used, so that the foils at the tab gap part need to be removed, thereby increasing waste and improving production cost.
In addition, when the whole welding is carried out, the power and the amplitude of the ultrasonic welding machine are relatively large, the outside pole lug is extremely easy to break and drop, the inside pole lug is also torn and the roll core is thick, and the inside pole lug is easy to deform in the transfer process after welding, so that the reject ratio of the roll core is increased.
Disclosure of Invention
The invention provides a dislocation tab welding method for reducing foil waste and improving welding yield, which divides a tab of a winding core in the same battery into a plurality of winding cores with proper thickness by performing tab dislocation on the winding core, and welds the tab of each winding core by adopting a specially-made positive and negative tab connecting piece.
In order to solve the technical problems, the invention provides the following technical scheme:
a dislocation tab welding method for reducing foil waste and improving welding yield comprises the following steps: the method comprises the following steps of:
s1, calculation in the early stage: designing the total winding core size and the number of layers of battery core pole pieces according to the capacity and size of a designed battery and the positive and negative characteristics of a battery material, then equally grouping the battery pole pieces according to the number of layers of the battery core pole pieces, dividing the battery pole pieces into an A-type winding core, a B-type winding core and a C-type winding core, and then designing the positions of lugs on the positive and negative pole pieces in the A-type winding core, the B-type winding core and the C-type winding core so as to ensure that the lug positions in the upper and lower adjacent winding core groups are arranged in a staggered manner;
s2, coating: coating the positive electrode and the negative electrode according to the sizes of the positive electrode sheet and the negative electrode sheet in the A-type winding core, the B-type winding core and the C-type winding core;
s3, punching: performing mass production on the positive and negative plates in the A-type winding core, the B-type winding core and the C-type winding core by adopting a laser cutting die to obtain an A-type positive plate and an A-type negative plate, a B-type positive plate and a B-type negative plate, and a C-type positive plate and a C-type negative plate;
s4, lamination: laminating three different types of positive and negative plates to form a type A winding core, a type B winding core and a type C winding core;
s5, detection: and (3) performing conventional shaping and short circuit testing on the prepared A-type winding core, B-type winding core and C-type winding core, and fixing the periphery of the A-type winding core, B-type winding core and C-type winding core by using a transparent adhesive tape to obtain the A-type winding core, B-type winding core and C-type winding core.
The following is the further optimization of the technical scheme of the invention:
in the step S4, the class a positive plate and the class a negative plate form a class a winding core, and a distance between a side of the class a winding core, which is far away from the class a positive tab and the class a negative tab, and two side edges of the class a winding core is L1.
Further optimization: in the step S4, the class B positive plate and the class B negative plate form a class B winding core, and a distance between a side of the class B winding core where the class B positive tab and the class B negative tab are far away from each other and two side edges of the class B winding core is L2.
Further optimization: in the step S4, the class C positive plate and the class C negative plate form a class C winding core, and a distance between a side of the class C positive tab and a side of the class C negative tab, which are away from each other, on the class C winding core and two side edges of the class C winding core is L3.
Further optimization: the lengths of the L1, L2, and L3 were: l1 < L2 < L3 or L1 > L2 > L3.
Further optimization: the method also comprises the production steps of the battery winding core group:
d1, assembling: respectively taking an A-type winding core, a B-type winding core and a C-type winding core, and sequentially stacking to form a large winding core, wherein the large winding core is the total winding core of the battery;
d2, preparing a positive tab connecting sheet and a negative tab connecting sheet: the positive tab connecting piece is made of an aluminum material, and the negative tab connecting piece is made of a copper material;
d3, welding: welding the positive tab connecting sheet and the negative tab connecting sheet with the positive and negative tabs on the A-type winding core, the B-type winding core and the C-type winding core by adopting an ultrasonic welding process;
d4, obtaining a finished product: and after the welding is finished, performing conventional shaping and short circuit testing on the battery general winding core, and finishing the manufacture of a finished product.
Further optimization: the positive lug connecting piece comprises a positive lug connecting main body, and one side of the positive lug connecting main body is integrally connected with a type A positive connecting piece, a type B positive connecting piece and a type C positive connecting piece; the A-type positive connecting sheet, the B-type positive connecting sheet and the C-type positive connecting sheet are arranged in parallel at intervals.
And (4) further optimizing: the negative electrode tab connecting piece comprises a negative electrode tab connecting main body, and one side of the negative electrode tab connecting main body is integrally connected with a class A negative electrode connecting piece, a class B negative electrode connecting piece and a class C negative electrode connecting piece; the A-type negative electrode connecting sheet, the B-type negative electrode connecting sheet and the C-type negative electrode connecting sheet are arranged in parallel at intervals.
Further optimization: in the step D3, welding the A-type positive electrode connecting sheet and the A-type positive electrode lug; the B-type positive electrode connecting sheet is welded with the B-type positive electrode lug; and the C-type positive electrode connecting sheet is welded with the C-type positive electrode lug.
Further optimization: in the step D3, welding the A-type negative electrode connecting sheet with the A-type negative electrode lug; the B-type negative electrode connecting sheet is welded with the B-type negative electrode lug; and the C-type negative electrode connecting sheet is welded with the C-type negative electrode lug.
By adopting the technical scheme, the invention has ingenious conception, fully considers the foil waste problem of the lithium ion battery in the manufacturing process and the welding problem possibly occurring in the ultrasonic welding, divides the whole battery roll core into a plurality of independent small roll cores according to the total layer number of the battery roll core, and prepares the unique positive lug connecting sheet and the unique negative lug connecting sheet in the same way, so that the positive lug and the negative lug on each small roll core are respectively subjected to the ultrasonic welding with the corresponding positive lug connecting sheet and the corresponding negative lug connecting sheet.
The method disclosed by the invention can reduce the number of layers for welding the lug, reduce the deformation of the outer lug and reduce the gap distance during coating, thereby achieving the purpose of reducing the waste of foil.
The invention is further illustrated with reference to the following figures and examples.
Drawings
FIG. 1 is a schematic diagram of a battery roll core in the prior art;
FIG. 2 is a schematic structural view of a battery total roll core according to the present invention;
FIG. 3 is a schematic structural view of a tab of a positive tab of the present invention;
FIG. 4 is a schematic structural view of a negative tab connection tab according to the present invention;
FIG. 5 is a schematic view of a class A core according to the present invention;
FIG. 6 is a schematic view of a type B core in accordance with the present invention;
FIG. 7 is a schematic view of a class C core according to the present invention.
In the figure: 1-class a winding core; 11-type a positive tab; 12-a type negative tab; 2-class B cores; 21-type B positive tab; 22-class B negative electrode tabs; a class 3-C core; 31-class C positive tab; a 32-C type negative tab; 4-positive lug connecting sheet; 41-positive tab connection body; 42-A type positive electrode connecting sheet; a 43-B type positive electrode connecting sheet; a 44-C type positive electrode connecting sheet; 5-connecting a negative pole lug; 51-negative tab connection body; a 52-A type negative electrode connecting sheet; 53-B type negative electrode connecting sheets; 54-C type negative pole connecting piece.
Detailed Description
Example 1: as shown in fig. 2-7, a method for welding a tab with a dislocation to reduce the waste of foil and improve the welding yield is provided: comprises the steps of producing the positive and negative plates of the battery and producing the battery winding core group.
The production steps of the positive and negative electrode plates of the battery comprise:
s1, calculation in the early stage: the design of the total winding core size and the number of layers of the battery core pole pieces is carried out according to the capacity, the size, the positive and negative characteristics and other related data of the designed battery, then the battery pole pieces are divided into a type A winding core 1, a type B winding core 2 and a type C winding core 3 according to the number of layers of the battery core pole pieces, then the positions of the lugs on the positive and negative pole pieces in the type A winding core 1, the type B winding core 2 and the type C winding core 3 are designed, and the lug positions in the upper and lower adjacent winding core groups are arranged in a staggered mode.
In this embodiment, the number of layers of the core electrode sheet layer of this battery total winding core is 180 layers, and the lamination order in every layer of core electrode sheet layer is: negative plate-diaphragm-positive plate-diaphragm.
When the number of layers of the battery core electrode sheet layer of the battery core is 180 layers, the number of layers of the battery core electrode sheet layer in the A-type core 1, the B-type core 2 and the C-type core 3 is 60 layers.
In this embodiment, the type a winding core 1, the type B winding core 2 and the type C winding core 3 are stacked to form a battery total winding core.
S2, coating: and coating the positive electrode and the negative electrode according to the sizes of the positive electrode sheet and the negative electrode sheet in the designed A-type winding core 1, the B-type winding core 2 and the C-type winding core 3.
The coating mode in the step S2 adopts intermittent coating
S3, punching: preparing three groups of laser cutting dies with different sizes according to the overall shapes and sizes of the positive and negative plates in the early calculation, and then carrying out mass production on the positive and negative plates in the A-type winding core 1, the B-type winding core 2 and the C-type winding core 3 by adopting the three groups of laser cutting dies; and obtaining the A-type positive plate and the A-type negative plate, the B-type positive plate and the B-type negative plate, and the C-type positive plate and the C-type negative plate.
In the step S3, the three types of pole pieces are uniformly punched every day during mass production.
S4, lamination: laminating three different types of positive and negative plates, matching the type A positive plate with the type A negative plate, matching the type B positive plate with the type B negative plate, and matching the type C positive plate with the type C negative plate; the lamination sequence is as follows: negative plate-diaphragm-positive plate-diaphragm-negative plate … negative plate.
The type A winding core 1 is composed of the type A positive plate and the type A negative plate, the overall structure of the type A winding core 1 is shown in fig. 5, and the distance between the side, away from each other, of the type A positive tab 11 and the type A negative tab 12 on the type A winding core 1 and the two side edges of the type A winding core 1 is L1.
The type B positive plate and the type B negative plate form a type B winding core 2, the overall structure of the type B winding core 2 is shown in fig. 6, and the distance between one side, away from each other, of a type B positive lug 21 and a type B negative lug 22 on the type B winding core 2 and the two side edges of the type B winding core 2 is L2.
The type C winding core 3 is formed by the type C positive plate and the type C negative plate, the overall structure of the type C winding core 3 is shown in fig. 7, and the distance between the side, away from each other, of the type C positive lug 31 and the type C negative lug 32 on the type C winding core 3 and the two side edges of the type C winding core 3 is L3.
In this embodiment, the lengths of the L1, L2, and L3 are: l1 < L2 < L3.
By the design, the positions of the positive and negative lugs in the A-type winding core 1, the B-type winding core 2 and the C-type winding core 3 which are finished in production are different in the same plane, and the positive and negative lugs in the A-type winding core 1, the B-type winding core 2 and the C-type winding core 3 are arranged in a staggered mode.
S5, detection: and carrying out conventional shaping and short circuit testing on the prepared A-type winding core 1, B-type winding core 2 and C-type winding core 3, fixing the periphery of the prepared A-type winding core 1, B-type winding core 2 and C-type winding core 3 by using a transparent adhesive tape, and obtaining the A-type winding core 1, B-type winding core 2 and C-type winding core 3 after the detection is qualified.
The production steps of the battery winding core group comprise:
d1, assembling: a type A winding core 1, a type B winding core 2 and a type C winding core 3 are respectively taken and stacked in sequence to form a large winding core, the large winding core is a battery general winding core, and then the periphery of the battery general winding core is fastened by adopting a transparent adhesive tape.
The battery total winding core prepared in the step D1 is shown in fig. 2, and positive and negative electrode tabs in the a-type winding core 1, the B-type winding core 2 and the C-type winding core 3 are arranged in a staggered manner.
D2, preparing a positive tab connecting sheet and a negative tab connecting sheet: the positive tab connecting piece 4 is made of an aluminum material, and the negative tab connecting piece 5 is made of a copper material.
The integral structure of the positive lug connecting piece 4 comprises a positive lug connecting main body 41, and one side of the positive lug connecting main body 41 is integrally connected with an A-type positive connecting piece 42, a B-type positive connecting piece 43 and a C-type positive connecting piece 44.
The A-type positive connecting sheet 42, the B-type positive connecting sheet 43 and the C-type positive connecting sheet 44 are arranged in parallel at intervals.
The length of the A-type positive connecting piece 42 is equal to that of the C-type positive connecting piece 44, and the length of the B-type positive connecting piece 43 is smaller than that of the A-type positive connecting piece 42.
The overall structure of the negative electrode tab connecting piece 5 comprises a negative electrode tab connecting body 51, wherein one side of the negative electrode tab connecting body 51 is integrally connected with an A-type negative electrode connecting piece 52, a B-type negative electrode connecting piece 53 and a C-type negative electrode connecting piece 54.
The A-type negative electrode connecting piece 52, the B-type negative electrode connecting piece 53 and the C-type negative electrode connecting piece 54 are arranged in parallel at intervals.
The length of the A-type negative electrode connecting piece 52 is equal to that of the C-type negative electrode connecting piece 54, and the length of the B-type negative electrode connecting piece 53 is smaller than that of the A-type negative electrode connecting piece 52.
D3, welding: welding the positive tab connecting piece 4 and the negative tab connecting piece 5 by adopting an ultrasonic welding process, wherein the A-type positive tab connecting piece 42 is welded with the A-type positive tab 11 during welding; the B-type positive electrode connecting sheet 43 is welded with the B-type positive electrode lug 21; the type C positive electrode connecting piece 44 is welded to the type C positive electrode tab 31.
The A-type negative electrode connecting sheet 52 is welded with the A-type negative electrode tab 12; the B-type negative electrode connecting sheet 53 is welded with the B-type negative electrode lug 22; the class C negative electrode tab 54 is welded to the class C negative electrode tab 32.
D4, obtaining a finished product: and after the positive lug connecting sheet 4 and the negative lug connecting sheet 5 are welded, performing conventional shaping and short circuit test on the battery general winding core, and then finishing the manufacture of a finished product.
Example 2: in this embodiment 2, when the battery pole pieces are equally grouped according to the number of layers of the cell pole pieces, the method may further include: a class A core, a class B core, a class C core, and a class D core.
In this embodiment 2, the number of layers of the cell pole piece layer of the total winding core of the battery is 200, and the sequence of the lamination in each layer of the cell pole piece layer is: negative plate-diaphragm-positive plate-diaphragm.
When the number of layers of the battery core electrode plate layer of the battery core is 180 layers, the number of layers of the battery core electrode plate layer in the A-type core, the B-type core, the C-type core and the D-type core is 50 layers.
And after the A-type winding core, the B-type winding core, the C-type winding core and the D-type winding core are prepared into the battery assembly winding core, the A-type winding core, the B-type winding core, the C-type winding core and the D-type winding core are also arranged in a staggered manner.
In this embodiment 2, the overall structure of the positive tab connecting piece 4 should be four positive tab connecting pieces, and the four positive tab connecting pieces are respectively welded to the positive tabs on the type a winding core, the type B winding core, the type C winding core and the type D winding core.
The overall structure of the negative electrode lug connecting piece 5 also needs to be four negative electrode connecting pieces, and the four negative electrode connecting pieces are respectively welded with the negative electrode lugs on the A-type winding core, the B-type winding core, the C-type winding core and the D-type winding core.
Example 3: in this embodiment 2, when the battery pole pieces are equally grouped according to the number of layers of the cell pole pieces, the grouping is divided into: a class a core, a class B core, and a class C core.
The distance between the side of the type A winding core 1, far away from the type A positive tab 11 and the type A negative tab 12, and the two side edges of the type A winding core 1 is L1.
The distance between the side of the type B winding core 2, far away from the type B positive tab 21 and the type B negative tab 22, and the two sides of the type B winding core 2 is L2.
The distance between the side of the C-type winding core 3 where the C-type positive tab 31 and the C-type negative tab 32 are far away from each other and the two side edges of the C-type winding core 3 is L3.
In this embodiment 3, the lengths of the L1, L2, and L3 are: l1 > L2 > L3.
By the design, the positions of the positive and negative lugs in the A-type winding core 1, the B-type winding core 2 and the C-type winding core 3 which are finished in production are different in the same plane, and then the positive and negative lugs in the A-type winding core 1, the B-type winding core 2 and the C-type winding core 3 are still arranged in a staggered mode.
It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.
Claims (10)
1. The utility model provides a dislocation utmost point ear welding method of reducing foil waste and promoting welding yields which characterized in that: the method comprises the following steps of:
s1, calculation in the early stage: designing the total winding core size and the number of layers of a battery core pole piece according to the capacity and size of a designed battery and the positive and negative characteristics of a battery material, then, equally grouping the battery pole pieces according to the number of layers of the battery core pole piece, dividing the battery pole pieces into an A-type winding core (1), a B-type winding core (2) and a C-type winding core (3), then designing the positions of lugs on the positive and negative pole pieces in the A-type winding core (1), the B-type winding core (2) and the C-type winding core (3), and ensuring that the lug positions in the upper and lower adjacent winding core groups are arranged in a staggered manner;
s2, coating: coating the positive electrode and the negative electrode according to the sizes of the positive electrode sheet and the negative electrode sheet in the designed A-type winding core (1), B-type winding core (2) and C-type winding core (3);
s3, punching: carrying out mass production on the positive and negative plates in the A-type winding core (1), the B-type winding core (2) and the C-type winding core (3) by adopting a laser cutting die to obtain an A-type positive plate and an A-type negative plate, a B-type positive plate and a B-type negative plate, and a C-type positive plate and a C-type negative plate;
s4, lamination: laminating three different types of positive and negative plates to form a type A winding core (1), a type B winding core (2) and a type C winding core (3);
s5, detection: and (3) carrying out conventional shaping and short circuit testing on the prepared A-type winding core (1), B-type winding core (2) and C-type winding core (3), and fixing the periphery by using a transparent adhesive tape to obtain the A-type winding core (1), the B-type winding core (2) and the C-type winding core (3).
2. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 1, which is characterized in that: in the step S4, the class a positive plate and the class a negative plate form a class a winding core (1), and the distance between the side of the class a winding core (1) where the class a positive tab (11) and the class a negative tab (12) are far away from each other and the two side edges of the class a winding core (1) is L1.
3. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 2, wherein the welding method comprises the following steps: in the step S4, the class B positive plate and the class B negative plate form a class B winding core (2), and the distance between the side of the class B positive tab (21) and the side of the class B negative tab (22) on the class B winding core (2) that are away from each other and the two side edges of the class B winding core (2) is L2.
4. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 3, wherein the welding method comprises the following steps: in the step S4, the class C positive plate and the class C negative plate form a class C winding core (3), and a distance between a side of the class C positive tab (31) and a side of the class C negative tab (32) on the class C winding core (3) away from each other and two sides of the class C winding core (3) is L3.
5. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 4, wherein the welding method comprises the following steps: the lengths of the L1, L2 and L3 are as follows: l1 < L2 < L3 or L1 > L2 > L3.
6. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 5, wherein the welding method comprises the following steps: the method also comprises the following steps:
d1, assembling: a type A winding core (1), a type B winding core (2) and a type C winding core (3) are respectively taken and stacked in sequence to form a large winding core, and the large winding core is the total winding core of the battery;
d2, preparing a positive tab connecting sheet and a negative tab connecting sheet: the positive lug connecting piece (4) is made of an aluminum material, and the negative lug connecting piece (5) is made of a copper material;
d3, welding: welding the positive and negative electrode tabs (4, 5) with the A-type winding core (1), the B-type winding core (2) and the C-type winding core (3) by an ultrasonic welding process;
d4, obtaining a finished product: and after the welding is finished, performing conventional shaping and short circuit testing on the battery general winding core, and finishing the manufacture of a finished product.
7. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 6, wherein the welding method comprises the following steps: the positive lug connecting piece (4) comprises a positive lug connecting main body (41), and one side of the positive lug connecting main body (41) is integrally connected with an A-type positive connecting piece (42), a B-type positive connecting piece (43) and a C-type positive connecting piece (44); the A-type positive electrode connecting sheet (42), the B-type positive electrode connecting sheet (43) and the C-type positive electrode connecting sheet (44) are arranged in parallel at intervals.
8. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 7, wherein the welding method comprises the following steps: the negative electrode tab connecting piece (5) comprises a negative electrode tab connecting main body (51), and one side of the negative electrode tab connecting main body (51) is integrally connected with an A-type negative electrode connecting piece (52), a B-type negative electrode connecting piece (53) and a C-type negative electrode connecting piece (54); the A-type negative electrode connecting sheet (52), the B-type negative electrode connecting sheet (53) and the C-type negative electrode connecting sheet (54) are arranged in parallel at intervals.
9. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 8, wherein the welding method comprises the following steps: in the step D3, welding the A-type positive electrode connecting sheet (42) with the A-type positive electrode lug (11); the B-type positive electrode connecting sheet (43) is welded with the B-type positive electrode lug (21); the C-type positive electrode connecting sheet (44) is welded with the C-type positive electrode lug (31).
10. The welding method of the staggered tab for reducing foil waste and improving welding yield of the tab of claim 9, wherein the welding method comprises the following steps: in the step D3, welding the A-type negative electrode connecting sheet (52) with the A-type negative electrode lug (12); the B-type negative electrode connecting sheet (53) is welded with the B-type negative electrode lug (22); the C-type negative electrode connecting sheet (54) is welded with the C-type negative electrode lug (32).
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