CN115275531A - Preparation method of multi-tab battery cell and multi-tab battery cell - Google Patents

Preparation method of multi-tab battery cell and multi-tab battery cell Download PDF

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Publication number
CN115275531A
CN115275531A CN202211171617.0A CN202211171617A CN115275531A CN 115275531 A CN115275531 A CN 115275531A CN 202211171617 A CN202211171617 A CN 202211171617A CN 115275531 A CN115275531 A CN 115275531A
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Prior art keywords
lug
tab
pole
pole piece
battery cell
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CN202211171617.0A
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CN115275531B (en
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张国帅
朱金保
于哲勋
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Jiangsu Zenio New Energy Battery Technologies Co Ltd
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Jiangsu Zenio New Energy Battery Technologies Co Ltd
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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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M10/0587—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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention relates to a preparation method of a multi-tab battery cell and the multi-tab battery cell, wherein the preparation method comprises the following steps: s1, winding a first pole piece, a diaphragm and a second pole piece to form a full-lug battery cell; s2, die-cutting the whole lug area of the full lug battery cell to form a multi-lug rudiment with a first pole piece lug, a second pole piece lug and a diaphragm false lug overlapped; and S3, removing the overlapped multi-pole lug rudiment regionally and selectively to obtain a first pole lug formed by only overlapping the first pole lug and a second pole lug formed by only overlapping the second pole lug. The invention changes the process steps of the prior art, adopts the manufacturing idea of integrating and then locally from top to bottom, obtains an integral structure in advance through a one-step forming method, and then obtains a finished product through local repair, thereby improving the integral processing efficiency and quality.

Description

Preparation method of multi-tab battery cell and multi-tab battery cell
Technical Field
The invention relates to the technical field of battery cell preparation, in particular to a preparation method of a multi-tab battery cell and the multi-tab battery cell.
Background
In recent years, industries related to new energy resources develop rapidly, the lithium ion battery technology is popularized and applied in a burst mode in the subdivided fields of electric automobiles, base station energy storage, electric tools and the like, and the requirements of the market on the performance and the capacity of the lithium ion battery technology are further increased. In order to improve power performance, the full-tab technology is adopted in more and more batteries at present, and on the basis, the full-tab technology is gradually developed into the multi-tab technology in order to further improve energy density.
For example, patent nos.: chinese patents CN113851604A, CN111668444A, CN114300751A, and the like all disclose a method for preparing a multi-tab electrical core, and as shown in fig. 1 and fig. 2, in combination with the above patents, a conventional core forming method adopted by the existing multi-tab technology is summarized, which specifically includes the following main steps:
step 1, cutting a first pole piece 10 and a second pole piece 20 which are taken as components in advance through a die cutting process to form a first pole piece tab 102, a first pole piece main body 101, a second pole piece tab 202 and a second pole piece main body 201; because the tabs on the first pole piece 10 and the second pole piece 20 need to be overlapped subsequently, the size of the tab spacing is controlled accurately when the tabs are respectively subjected to die cutting and forming, therefore, no matter a mechanical cutter or laser cutting is adopted, precise equipment is needed, each tab spacing can be accurately controlled, the equipment investment and maintenance cost are quite high, and meanwhile, due to the high cutting frequency, the damage to the active main body material area of the tabs cannot be avoided in the process, and the material waste and quality risk are caused.
Step 2, after the die cutting pretreatment is finished, winding and forming the first pole piece 10 and the second pole piece 20; because the tab part of the die-cut pole piece is in a discontinuous state, as shown in a position a in fig. 2, the tab is easy to warp upwards, downwards or warp in the tape moving process, and even the root of the tab is torn when passing through a rotating roller, so that the material waste is caused, and the integral winding forming efficiency is also seriously tired; in addition, the pole piece supplied materials have coating weight/thickness fluctuation, and inherent problems such as tension fluctuation exist in the winding process, for example, at the position b in fig. 2, the winding core tab after winding is easy to form a dislocation phenomenon, and subsequent assembly processing and battery performance are influenced.
In summary, the conventional bottom-up assembly concept (local assembly and integral assembly) in the manufacturing industry is adopted in the preparation method of the multi-tab battery cell in the prior art, and the method is mature and reliable, and has the defects that each component needs to be preprocessed in advance, so that on one hand, the workload is greatly increased, and on the other hand, high requirements are placed on the single size design, the processing precision and the integral matching precision of each component.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of the prior art for preparing the multi-tab battery cell, and the method for preparing the multi-tab battery cell and the multi-tab battery cell prepared by the method are provided.
In order to solve the technical problem, the invention provides a preparation method of a multi-tab battery cell, which comprises the following steps:
s1, winding a first pole piece, a diaphragm and a second pole piece to form a full-lug battery cell;
s2, die-cutting the whole lug area of the full lug battery cell to form a multi-lug rudiment with a first pole piece lug, a second pole piece lug and a diaphragm false lug overlapped;
and S3, performing regional and selective removal treatment on the overlapped multi-pole-lug prototypes to obtain a first pole lug formed by only overlapping the first pole lug and a second pole lug formed by only overlapping the second pole lug.
In one embodiment of the present invention, in step S1, the first pole piece and the second pole piece are arranged to partially protrude from the separator in the tab area.
In one embodiment of the present invention, in step S2, after the die cutting process, the multi-tab prototype includes a first tab part, a second tab part and an edge overlapping part, wherein:
the first pole lug part and the second pole lug part respectively comprise a plurality of layers of first pole piece tabs, diaphragms and second pole piece tabs which are alternately partially overlapped;
the edge overlapping part comprises a plurality of layers of first pole piece tabs, a diaphragm and second pole piece tabs which are alternately and completely overlapped.
In an embodiment of the present invention, in step S3, the following steps are specifically included:
s3-1-1, soaking the first pole lug part and all the edge overlapped parts in a first chemical liquid, corroding off a second pole lug in the first pole lug part and the edge overlapped parts, only reserving the first pole lug, forming a first pole lug only reserving the first pole lug on the first pole lug part, and forming first pole lug cladding redundancy on the edge overlapped parts, namely enabling the edge overlapped parts of the first pole piece to protrude out of the connection position of the first pole lug and the first pole piece;
and S3-1-2, soaking the second pole lug part and part of the edge overlapping part in a second chemical solution, corroding off a first pole lug in the second pole lug part and the edge overlapping part, only reserving the second pole lug, forming a second pole lug only reserving the second pole lug on the second pole lug part, and forming second pole lug coating redundancy on the edge overlapping part, namely enabling the edge overlapping part of the second pole lug to protrude out of the connecting position of the second pole lug and the second pole.
In an embodiment of the invention, the method further includes step S3-1-3, after the first tab and the second tab are obtained, performing edge cleaning on the first tab and the second tab, and removing the residual first chemical liquid and second chemical liquid.
In one embodiment of the invention, in step S3-1-3, a third chemical solution is used to perform edge cleaning, and the membrane at the first tab and the second tab is removed by etching while cleaning.
In an embodiment of the present invention, before step S1, the first pole piece and the second pole piece are subjected to a pre-damage treatment, and a first tab pre-damage and a second tab pre-damage larger than a target tab width are formed on the first pole piece and the second pole piece, respectively.
In an embodiment of the present invention, in step S3, the following steps are specifically included:
and S3-2-1, removing the first pole piece lug and the second pole piece lug along the first pole piece lug and the second pole piece lug in advance respectively to form a first pole lug only retaining the first pole piece lug and a second pole lug only retaining the second pole piece lug.
In one embodiment of the invention, the method of pre-wound treatment comprises localized linear micro-hole cutting or linear chemical etching.
In order to solve the technical problem, the invention also provides a multi-tab battery cell which is prepared by the method,
compared with the prior art, the technical scheme of the invention has the following advantages:
the invention discloses a preparation method of a multi-pole lug battery cell, which is based on the preparation idea, changes the preparation steps of the prior art, adopts the manufacturing idea of integrating and then locally from top to bottom, and first winds a first pole piece, a diaphragm and a second pole piece used for preparing the battery cell to form the full-pole lug battery cell, obtains an integral structure in advance through a one-step forming method, then carries out local repair, carries out die cutting treatment on the whole pole lug area of the full-pole lug battery cell to obtain a multi-pole lug rudiment, the multi-pole lug rudiment is formed by overlapping the first pole piece pole lug, the second pole piece pole lug and a diaphragm false pole lug at the moment, only forms a battery cell structure in shape but cannot carry out safe charging and discharging, and finally carries out regional and selective removal treatment on the multi-pole lug rudiment, selectively removes the first pole piece pole lug and the second pole piece lug in different regions, thereby respectively forming a first pole lug formed by overlapping the first pole piece pole lug and a second pole piece lug formed by overlapping only;
according to the preparation method of the multi-tab battery cell, the first pole piece, the diaphragm and the second pole piece are wound and formed, then the whole die cutting is carried out, the whole-tab thinking is used for replacing the traditional tab-whole route, namely, the post-processing of the roll core level is used for replacing the die cutting of the traditional method at the pole piece level, the problems of the traditional multi-tab winding are avoided, and the preparation method has obvious advantages in the aspects of production efficiency, product yield and the like; and moreover, material waste caused by the connection and disconnection of the pole pieces and the poor size of the pole lugs is reduced, the cost of related equipment is reduced, potential mechanical damage possibly caused to the pole pieces by a die cutting process is avoided, and the performance of the battery is improved.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
Fig. 1 is a flow chart of the steps of a prior art method of making a multi-tab cell;
fig. 2 is a process flow diagram of a prior art method of making a multi-tab cell;
fig. 3 is a flow chart of the steps of a method of making a multi-tab cell of the present invention;
fig. 4 is a process flow diagram of a method of making a multi-tab cell of the present invention;
fig. 5 is a schematic structural diagram of a top projection of a full tab cell in step S1 in embodiment 1 of the present invention;
FIG. 6 is a process flow chart of step S2 in example 1 of the present invention;
FIG. 7 is a process flow chart of step S3 in example 1 of the present invention;
FIG. 8 is a process flow diagram of a pre-injury treatment according to example 2 of the present invention;
FIG. 9 is a process flow chart of step S3 in example 2 of the present invention.
Description reference numbers indicate: 10. a first pole piece; 101. a first pole piece main body; 102. a first pole tab; 102S, pre-damaging a first tab; 20. a second pole piece; 201. a second diode body; 202. a second pole tab; 202S, pre-damaging a second tab; 30A, a full-tab battery cell; 30B, semi-finished multi-tab battery cells; 30C, finished product multi-tab battery cell; 301. a body region; 302. a polar ear region; 3021. a first pole piece tab; 3021A, a first tab portion; 3022. a second pole piece tab; 3022A, second pole ear; 3023. a diaphragm false tab; 303. an edge overlapping portion; s01, first chemical liquid; s02, second chemical liquid; s03, third chemical liquid.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As described above, the multi-tab battery cell is formed by winding the first pole piece 10, the second pole piece 20 and the diaphragm which are arranged in a stacked manner, in the prior art, when the multi-tab battery cell is prepared, the first pole piece 10 and the second pole piece 20 are cut by adopting a die cutting process to form a plurality of first pole tab pieces 102 and second pole tab pieces 202, then the first pole piece 10, the second pole piece 20 and the diaphragm are wound, after winding, different first pole tab pieces 102 are mutually overlapped to form a first tab, different second pole tab pieces 202 are mutually overlapped to form a second tab, and the first tab and the second pole tab are arranged at intervals; in order to overlap the first pole lug piece 102 and the second pole lug piece 202 at different positions after winding and to form a first pole lug and a second pole lug which can be arranged at intervals, it is conceivable that the positions of each pole lug piece after die cutting need to be accurately calculated according to the curvature radius of winding before cutting, and the pole lug pieces after winding can be overlapped only by the method.
The invention analyzes the difficulty of the multi-tab battery cell prepared by the existing preparation method, changes the preparation steps of the prior art from the preparation idea, adopts the manufacturing idea of whole and part from top to bottom, and discloses a preparation method of the multi-tab battery cell, which is shown by reference to fig. 3 and 4 and comprises the following steps:
step S1, winding a first pole piece 10, a diaphragm, and a second pole piece 20 by using a conventional winding technology to form a full tab cell 30A, where the full tab cell 30A includes a main body region 301 and a tab region 302, and because a first pole tab 102 and a second pole tab 202 are not formed by cutting the first pole piece 10 and the second pole piece 20, it is not necessary to consider whether positions of the pole tabs overlap or not during winding, and it is not necessary to consider whether there is a relative position slip between the first pole piece 10 and the second pole piece 20 during winding, and meanwhile, there is no requirement for a coating thickness and a coating weight of the first pole piece 10 and the second pole piece 20;
in the embodiment, a lamination technology may also be adopted, and the first pole piece 10, the diaphragm, and the second pole piece 20 are stacked to form a full tab battery cell 30A;
step S2, carrying out die cutting treatment on the whole pole ear area 302 of the full-pole ear cell 30A to obtain a semi-finished product multi-pole ear cell 30B with a multi-pole ear rudiment, wherein the multi-pole ear rudiment comprises a first pole piece pole ear 3021, a second pole piece pole ear 3022 and a diaphragm false pole ear 3023 which are arranged in an overlapping manner, and the multi-pole ear rudiment subjected to integral die cutting treatment is adopted and has a certain overlapped pole ear structure, but the multi-pole ear rudiment obtained at the moment is formed by overlapping the first pole piece pole ear 3021, the second pole piece pole ear 3022 and the diaphragm false pole ear 3023, only an electric core structure is formed in shape, but safe charging and discharging cannot be carried out;
and S3, performing regional and selective removal treatment on the overlapped multi-tab prototype to obtain a first tab formed by only overlapping the first pole tab 3021 and a second tab formed by only overlapping the second pole tab 3022, so as to obtain a finished multi-tab battery cell 30C, wherein the multi-tab prototype obtained in the step S2 is formed by overlapping the first pole tab 3021, the second pole tab 3022 and the membrane dummy tab 3023, when the first tab is required to be obtained, the second pole tab 3022 and the membrane dummy tab 3023 in the multi-tab prototype structure can be removed, and when the second tab is required to be obtained, the first pole tab 3021 and the membrane dummy tab 3023 in the multi-tab prototype structure can be removed.
According to the preparation method of the multi-tab battery cell, the first pole piece 10, the diaphragm and the second pole piece 20 are wound and formed, then the integral die cutting is carried out, the idea of firstly preparing the integral winding structure and then preparing the tabs is used for replacing the traditional method of firstly preparing the tabs, the post-processing of a winding core level is adopted for replacing the traditional method of die cutting at the pole piece level in the integral winding route, the problems of the traditional multi-tab winding are avoided, and the preparation method has remarkable advantages in the aspects of production efficiency, product yield and the like; and moreover, material waste caused by the connection and disconnection of the pole pieces and the poor size of the pole lugs is reduced, the cost of related equipment is reduced, potential mechanical damage possibly caused to the pole pieces by a die cutting process is avoided, and the performance of the battery is improved.
According to the preparation method of the multi-pole-ear battery cell, the winding process and the die cutting process are respectively adopted in the step S1 and the step S2 for processing treatment, the difference from the traditional process is not large, the key point and the difficulty of the preparation method are that the step S3 is that part of the structure is removed regionally and selectively in the first pole piece 3021, the second pole piece 3022 and the diaphragm false pole ear 3023 which are arranged in a laminated manner after winding, and only the required structure is reserved; since the thicknesses of the first pole piece 10, the second pole piece 20 and the diaphragm are all relatively thin, layered cutting cannot be achieved by adopting a physical cutting method (such as a water knife, an air knife, a laser knife mold, a hardware prop and the like), and the first pole piece 10, the second pole piece 20 and the diaphragm are arranged in an overlapping manner, and a layer-by-layer selective cutting cannot be achieved by adopting a mechanical cutting method.
Example 1
Referring to fig. 5 to 7, the method specifically includes the following steps:
step S1, because the winding core of the current multi-tab winding technology is generally a same-side tab, the same-side tab is explained in this embodiment, as shown in fig. 5, a first pole piece 10, a separator, and a second pole piece 20 are wound to form a full-tab electric core 30A, the first pole piece 10 includes a first pole piece main body 101 and a first pole tab 102, and the second pole piece 20 includes a second pole piece main body 201 and a second pole tab 202, for safety, a pole piece covering redundancy design must exist in the current lithium ion battery winding core, especially in a region near a tab lead-out region, so in this example, the first pole tab 102 and the second pole tab 202 are arranged to partially protrude from the separator, specifically, the first pole tab 102 and the second pole tab 202 are arranged to protrude from the separator at the same height, the heights of the pole tabs formed by the pole pieces are ensured to be the same, the lengths of the first pole tab 102 and the second pole tab 202 are arranged to be different, and the lengths of the overlapping portions of the first pole tab 102 and the second pole tab 202 are also different, where the length of the first pole tab 102 and the overlapping portion of the separator 202 is D2.
Step S2, as shown in fig. 6, performing die cutting processing on the whole tab area 302 of the full tab electric core 30A, and after performing the die cutting processing, forming a multi-tab prototype, where the multi-tab prototype includes a first tab part 3021A, a second tab part 3022A, and an edge overlapping part 303, where:
each of the first tab part 3021A and the second tab part 3022A includes a plurality of layers of first tab 3021, a separator, and a second tab 3022, which are alternately and partially overlapped;
the edge overlap 303 includes a plurality of layers of first pole piece tabs 3021, separators, and second pole piece tabs 3022 alternately arranged to overlap;
specifically, in the multi-tab prototype formed after die cutting, the first tab part 3021A and the second tab part 3022A are still in a state where the first tab part 3021 and the second tab part 3022A are alternately overlapped in multiple layers, and the cut edge projections of the first tab part 3021, the second tab part 3022, and the diaphragm of the edge overlapping part 303 completely overlap, that is, the coating redundancies D2 and D2 are both 0, so that the semi-finished multi-tab battery cell 30B manufactured by the full tab battery cell 30A with tabs on the same side through a simple cutting method cannot be manufactured into a rechargeable battery, and even if the multi-tab battery cell 30B is a tab on the opposite side, the manufactured semi-finished multi-tab battery cell 30B cannot be safely charged and discharged because the coating redundancies of the tab parts are zero.
Step S3, performing a regional and selective removal process on the overlapped multi-tab prototype, removing the separator and the second tab 3022 in the first tab portion 3021A to obtain a first tab overlapped only by the first tab 3021, and removing the separator and the first tab 3021 in the second tab portion 3022A to obtain a second tab overlapped only by the second tab 3022; referring to fig. 7, in this embodiment, the step S3 specifically includes the following steps:
step S3-1-1, soaking the first tab part 3021A and the entire edge overlapping portion 303 in a first chemical liquid S01, ensuring that the first tab part 3021 can be completely soaked in the first chemical liquid S01, that is, the height of the edge overlapping portion 303 soaked in the first chemical liquid S01 is D2, etching off the second tab part 3022 in the first tab part 3021A and the edge overlapping portion 303, leaving only the first tab part 3021, forming a first tab part in the first tab part 3021A, leaving only the first tab part 3021, forming a first tab part in the edge overlapping portion 303 with a height of D2, and covering redundancy with the first tab part 3021;
step S3-1-2, soaking the second pole lug 3022A and a part of the edge overlapping portion 303 in a second chemical solution S02, so as to ensure that the second pole lug 3022 can be completely soaked in the second chemical solution S02, that is, the height of the edge overlapping portion 303 soaked in the second chemical solution S02 is d2, etching off the first pole lug 3021 in the second pole lug 3022A and the edge overlapping portion 303, leaving only the second pole lug 3022, forming a second pole lug in the second pole lug 3022A, and forming a second pole lug 3022 with a height of d2 in the edge overlapping portion 303 to cover redundancy.
In this embodiment, a chemical etching method is used to achieve a delamination removal effect, the substrate used for the first electrode sheet 10 is generally a copper foil, the substrate used for the second electrode sheet 20 is generally an aluminum foil, and the chemical reaction properties of the copper foil and the aluminum foil are significantly different, and different chemical solutions can be respectively configured by using the chemical properties, specifically, the first chemical solution S01 can be a dilute hydrochloric acid solution or a sodium hydroxide solution, and these chemical solutions can react with an aluminum base to achieve a purpose of removing the aluminum base electrode tab, so that the first electrode tab portion 3021A and the second electrode tab 3022 in the edge overlapping portion 303 can be etched by using the first chemical solution S01, the second chemical solution S02 can be concentrated nitric acid, and these chemical solutions can react with a copper base to achieve a purpose of removing the copper base electrode tab, so that the second electrode tab portion 3022A and the first electrode tab 3021 in the edge overlapping portion 303 can be etched by using the second chemical solution S02.
In the embodiment, the method further comprises the step S3-1-3 of cleaning the edges of the first lug and the second lug after the first lug and the second lug are obtained, and removing the residual first chemical liquid S01 and the residual second chemical liquid S02;
specifically, the third chemical liquid S03 is used for edge cleaning, and the third chemical liquid S03 is an organic solvent, such as xylene, tetrahydronaphthalene, decahydronaphthalene, and the like, which does not affect the first tab and the second tab but can react with the membrane, so that the membrane at the first tab and the second tab can be corroded and removed while cleaning.
Example 2
Based on the preparation method of the present invention, an improved scheme is also proposed in this embodiment, which is shown in fig. 8 and 9, and specifically includes the following steps:
before the step S1, performing pre-damage treatment on the first pole piece 10 and the second pole piece 20, respectively forming a first tab pre-damage 102S and a second tab pre-damage 202S on the first pole piece 10 and the second pole piece 20, which are larger than a target tab width, respectively, specifically, the pre-damage treatment does not cut off the first pole piece 10 and the second pole piece 20, the first tab pre-damage 102S and the second tab pre-damage 202S are set to extend only in a pole piece winding direction, and the pre-damage size is set to be smaller in proportion to the whole winding core width size, so that the pre-damage treatment is performed before winding, which can meet local pre-damage requirements, and can not influence the winding speed and the goodness of the whole tab due to too large and overweight wounds.
In this embodiment, step S1 and step S2 are the same as those in embodiment 1, and are not described herein, and step S3 is different from embodiment 1, and specifically includes the following steps:
step S3-2-1, respectively removing the first pole piece tab 3021 and the second pole piece tab 3022 along the first pole piece pre-damage 102S and the second pole piece pre-damage 202S to form a first pole tab only retaining the first pole piece tab 3021 and a second pole tab only retaining the second pole piece tab 3022, in this embodiment, because the pre-damage treatment is performed on the first pole piece 10 and the second pole piece 20 before step S1, and after winding and die cutting, only the positions of the first pole piece pre-damage 102S and the second pole piece pre-damage 202S need to be re-treated, including repeated bending, high-frequency oscillation, and other methods, the fracture removal of the first pole piece pre-damage 102S and the second pole piece pre-damage 202S is realized, so that the target effect that only the first pole piece 3021 is left in the first pole piece portion 3021A and only the second pole piece portion 3022A remains in the second pole piece tab 3022 is realized.
Specifically, according to the actual situation, the method of pre-damage treatment may adopt a mechanical cutting method, which may cut local linear micropores, and a chemical etching method, which may spray chemical etching liquid linearly.
Example 3
The invention also discloses a multi-tab battery cell which is prepared based on the preparation methods of the embodiment 1 and the embodiment 2.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A preparation method of a multi-tab battery cell is characterized by comprising the following steps:
s1, preparing a first pole piece, a diaphragm and a second pole piece to form a full-lug battery cell;
s2, performing die cutting treatment on the whole lug area of the full lug battery cell to form a multi-lug rudiment with a first pole piece lug, a second pole piece lug and a diaphragm false lug overlapped;
and S3, removing the overlapped multi-pole lug rudiment regionally and selectively to obtain a first pole lug formed by only overlapping the first pole lug and a second pole lug formed by only overlapping the second pole lug.
2. The method for preparing a multi-tab battery cell according to claim 1, wherein the method comprises the following steps: in step S1, when forming a full tab electric core, the first pole piece and the second pole piece partially protrude from the diaphragm in the tab area.
3. The method for preparing a multi-tab cell of claim 2, wherein: in step S2, after the die-cutting process is performed, the multi-tab prototype includes a first tab portion, a second tab portion, and an edge overlapping portion, wherein:
the first pole lug part and the second pole lug part respectively comprise a plurality of layers of first pole piece tabs, diaphragms and second pole piece tabs which are alternately partially overlapped;
the edge overlapping part comprises a plurality of layers of first pole piece tabs, a diaphragm and second pole piece tabs which are arranged in an alternating and all-overlapping mode.
4. The method for preparing a multi-tab cell as claimed in claim 3, wherein: in step S3, the method specifically includes the following steps:
s3-1-1, soaking the first pole lug part and all the edge overlapped parts in a first chemical liquid, removing a second pole lug positioned in the first pole lug part and the edge overlapped parts, only reserving the first pole lug, forming a first pole lug only reserving the first pole lug on the first pole lug part, forming first pole lug cladding redundancy on the edge overlapped parts, namely enabling the edge overlapped parts of the first pole piece to protrude out of the connection position of the first pole lug and the first pole piece;
and S3-1-2, soaking the second pole piece part and part of the edge overlapping part in a second chemical solution, corroding a first pole piece tab in the second pole piece part and the edge overlapping part, only reserving the second pole piece tab, forming a second pole piece tab only reserving the second pole piece tab on the second pole piece part, and forming a second pole piece tab coating redundancy on the edge overlapping part, namely enabling the edge overlapping part of the second pole piece to protrude out of the connecting position of the second pole piece and the second pole piece.
5. The method for preparing a multi-tab battery cell according to claim 4, wherein the method comprises the following steps: and the method further comprises the step S3-1-3 of cleaning the edges of the first tab and the second tab after the first tab and the second tab are obtained, and removing the residual first chemical liquid and second chemical liquid.
6. The method for preparing a multi-tab battery cell according to claim 5, wherein the method comprises the following steps: in step S3-1-3, edge cleaning is performed by using a third chemical solution, and the diaphragms at the first lug and the second lug are etched and removed while cleaning.
7. The method for preparing a multi-tab battery cell according to claim 1, wherein the method comprises the following steps: before the step S1, pre-damage treatment is respectively carried out on the first pole piece and the second pole piece, and a first pole lug pre-damage and a second pole lug pre-damage which can cover the width of a target pole lug are respectively formed on the first pole piece and the second pole piece.
8. The method for preparing a multi-tab cell of claim 7, wherein the method comprises the following steps: in step S3, the method specifically includes the following steps:
and S3-2-1, respectively removing the first pole piece lug and the second pole piece lug along the first pole piece pre-damage and the second pole piece pre-damage to form a first pole piece lug only retaining the first pole piece lug and a second pole piece lug only retaining the second pole piece lug.
9. The method for preparing a multi-tab cell of claim 7, wherein the method comprises the following steps: the method for pre-injury treatment comprises local linear micropore cutting or linear chemical corrosion.
10. The utility model provides a many utmost point ear electricity core which characterized in that: prepared by the process of any one of claims 1 to 9.
CN202211171617.0A 2022-09-26 2022-09-26 Preparation method of multi-tab battery cell and multi-tab battery cell Active CN115275531B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108550896A (en) * 2018-05-29 2018-09-18 江苏海基新能源股份有限公司 A kind of full lug coiling column lithium ion battery assembly method
CN114300751A (en) * 2021-12-15 2022-04-08 惠州锂威新能源科技有限公司 Multi-electrode ear lithium ion battery and preparation method thereof
CN216773467U (en) * 2022-02-24 2022-06-17 中创新航科技股份有限公司 Battery and battery pack

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108550896A (en) * 2018-05-29 2018-09-18 江苏海基新能源股份有限公司 A kind of full lug coiling column lithium ion battery assembly method
CN114300751A (en) * 2021-12-15 2022-04-08 惠州锂威新能源科技有限公司 Multi-electrode ear lithium ion battery and preparation method thereof
CN216773467U (en) * 2022-02-24 2022-06-17 中创新航科技股份有限公司 Battery and battery pack

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