CN113782838B - Cell thermal compounding manufacturing process - Google Patents
Cell thermal compounding manufacturing process Download PDFInfo
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- CN113782838B CN113782838B CN202111330000.4A CN202111330000A CN113782838B CN 113782838 B CN113782838 B CN 113782838B CN 202111330000 A CN202111330000 A CN 202111330000A CN 113782838 B CN113782838 B CN 113782838B
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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
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
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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
- 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
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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
Abstract
The invention discloses a process for manufacturing a battery cell by thermal compounding, which comprises the following process steps: the pole piece is made: forming a pole piece strip with a strip-shaped structure through a pole lug, and cutting the pole piece to form a single-sheet pole piece; pole piece bag making: the single-sheet first pole piece or the single-sheet second pole piece is respectively bonded on the front side wall and the back side wall in a thermal compounding way through diaphragms on the two sides, the diaphragms on the front side and the back side extend to the outer side of the first pole piece or the second pole piece and are bonded with each other to form a continuous pole piece bag, and the continuous pole piece bag is cut into the single-sheet bag; preparing a battery core: the single pole piece and the single pole piece bag are mutually staggered and overlapped to form the battery core. The invention solves the diaphragm wrinkling problem, ensures the position precision between the positive and negative pole pieces, simplifies the single diaphragm contraposition process of the traditional lamination by adopting the diaphragm larger than the size of the pole pieces, effectively improves the lamination efficiency, reduces the short circuit and flammability condition and improves the safety coefficient of the battery.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a thermal compounding and manufacturing process of a battery core in the field of lithium ion power batteries.
Background
With the development of new energy greatly promoted by the state, the demand of various industries on lithium ion power batteries is increasing day by day, and a battery cell in a composition structure of the lithium ion power battery is a core component of the lithium ion power battery, and the battery cell is generally formed by mutually overlapping positive and negative pole pieces in a staggered manner. The battery cell composition structure comprises a plurality of positive and negative pole pieces which are staggered and superposed up and down, and the positive and negative pole pieces are isolated and insulated through diaphragms.
The existing battery core manufacturing process comprises two modes of strip lamination and single lamination according to different diaphragm inserting processes, namely continuous diaphragms and single diaphragm lamination are adopted during lamination. The belt-shaped lamination process is more widely applied in domestic markets due to higher productivity, and the single lamination process is less applied due to the fact that the productivity cannot meet the actual production requirement. For the strip lamination process, positive and negative pole pieces are alternately placed on a lamination platform during lamination, a strip diaphragm is circularly pulled back and forth above the lamination platform, the positive pole piece or the negative pole piece is covered on the surface of the positive pole piece or the negative pole piece after being laminated, and then the diaphragm is cut; this kind of lamination mode, belt form diaphragm tensioning and by the round trip pulling in the lamination process, there is stress inside, and the diaphragm surface can appear wrinkling the circumstances such as after deciding, influences electric core quality. For the single lamination process, the diaphragm is firstly cut into a single structure before lamination, and the single diaphragm is laminated on the surface of the positive pole piece or the negative pole piece after the positive pole piece and the negative pole piece are laminated to realize lamination.
The lithium battery devices with more advanced technology at home are mainly mastered by foreign device suppliers, and compared with the ribbon stacking process and the single-sheet stacking process, the lithium battery devices with more advanced technology at present are the lamination devices of the korean LG company, the equipment adopts a manufacturing process to synchronously and linearly drive the negative pole piece and the positive pole piece forwards to form two linear transmission paths which are parallel and spaced up and down, at the same time, two coiled strip diaphragms are correspondingly arranged below the negative pole piece transmission path and between the positive pole piece transmission path and the negative pole piece transmission path, and the strip diaphragm is horizontally pulled out, and passes through the hot-pressing rollers which are arranged at intervals up and down together with the positive and negative pole pieces for hot compounding, cutting the strip diaphragm along the gap between two adjacent pole pieces in the horizontal direction to form a unit body which is sequentially provided with the diaphragm, a negative pole piece, the diaphragm and a positive pole piece from top to bottom, and then sequentially laminating the unit body after the unit body is aligned by a CCD (charge coupled device) to form a battery cell; according to the manufacturing process, the middle unit body is added, the diaphragm is bonded on the surfaces of the positive and negative pole pieces in a thermal compounding mode before being cut, the problem of internal stress existing in direct lamination of the strip diaphragm is solved to a certain extent, and meanwhile, the CCD aligning part improves the aligning precision when the unit bodies are laminated. However, in the unit body manufacturing process, the unit body is manufactured in a blind stacking manner, that is, positive and negative electrode plates are synchronously and linearly conveyed and stacked, and alignment between the vertically arranged positive and negative electrode plates is lacked, so that the precision of the positive and negative electrode plates in the unit body cannot be ensured. In addition, the side parts of the positive and negative electrode plates of the laminated battery core manufactured by the manufacturing process are all in an open structure, and the electrolyte is filled around the outside of the laminated battery core, so that the outer edges of the positive electrode plate and the negative electrode plate in the open structure are both in contact with the electrolyte around the outside, and the short circuit and flammability potential safety hazard exists in the actual use process. Aiming at the domestic lithium battery industry and the technical current situation, a brand-new battery core manufacturing process and a manufacturing production line thereof are designed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pole piece bag which is manufactured by sealing and coating an upper layer and a lower layer of diaphragms on a single pole piece, and a battery core is formed by aligning and laminating the pole piece and the pole piece bag, thereby solving the problem of diaphragm wrinkling, ensuring the position precision between a positive pole piece and a negative pole piece, simplifying the single diaphragm alignment procedure of the traditional lamination by adopting the diaphragms with the size larger than that of the pole piece in the bag manufacturing process, effectively improving the lamination efficiency, and reducing the short circuit and flammability condition and improving the battery core thermal compounding manufacturing process by utilizing the diaphragm bag to block the direct contact of the pole piece in the diaphragm fully-coated single pole piece after the electrolyte is filled.
The technical scheme adopted by the invention is as follows: a process for manufacturing a battery cell by thermal compounding comprises the following process steps:
s1, manufacturing a first pole piece: forming a first pole piece belt of a belt-shaped structure through a pole lug, and cutting the pole piece to form a single-piece first pole piece;
s2, preparing a second pole piece: forming a second pole piece belt of a belt-shaped structure with the polarity opposite to that of the first pole piece in the step S1 through a pole lug, and cutting the pole piece to form a second pole piece in a single sheet shape;
s3, pole piece bag making: in the process of linear transmission of the first or second single-sheet pole piece in the step S1 or S2, the front and back sides of the first or second pole piece are synchronously covered with strip-shaped diaphragms, the diaphragms on the two sides are respectively bonded with the front and back side walls of the first or second pole piece in a thermal compounding manner, the diaphragms on the front and back sides extend to the outer side of the first or second pole piece and are bonded with each other to form a continuous pole piece bag wrapping the first or second pole piece, and the continuous pole piece bag is cut into single pole piece bags;
s4, preparing a battery cell: when the first pole piece is used for making the bag in the step S3, the second pole piece in the step S2 and the single pole piece bag in the step S3 are overlapped in a staggered mode to form a battery cell; when the second pole piece is used for making the pouch in step S3, the first pole piece in step S1 and the single pole piece pouch in step S3 are overlapped in an interlaced manner to form a battery cell.
Preferably, the first pole piece in the step S1 is a positive pole piece, and the process in the step S1 sequentially includes unwinding and deviation rectifying of the positive pole piece, tension buffering, process deviation rectifying, die forming of a tab, CCD detection of tab size, die cutting of a sheet material, CCD detection of the sheet material, blanking of the positive pole piece, and buffering of the positive pole piece.
Preferably, the second pole piece in the step S2 is a negative pole piece, and the process in the step S2 sequentially includes unwinding and deviation rectifying of the negative pole piece, tension buffering, process deviation rectifying, laser forming of the tab, CCD detection of the tab size, laser cutting of the tab piece, dust removal of the pole piece, and CCD detection of the pole piece size.
Preferably, the pole piece bag making in the step S3 is a negative pole piece, and the process in the step S3 sequentially includes pole piece and diaphragm compounding, pole piece and diaphragm protection film entering, pole piece preheating, pole piece hot pressing, pole piece short circuit testing, CCD diaphragm size detection, die diaphragm cutting, negative pole piece bag blanking and negative pole piece bag caching.
Preferably, in step S3, two sides of the monolithic negative electrode sheet linearly and horizontally conveyed forward are respectively provided with a separator roll, and the separator on the separator roll is respectively pulled out along the conveying direction of the monolithic negative electrode sheet and passes through the hot press rolls symmetrically arranged on two sides of the monolithic negative electrode sheet.
Preferably, the two sides of the monolithic negative pole piece are respectively provided with a protective film material roll, a tensioning roll and a material receiving roll, and a protective film pulled out by the protective film material roll covers the surface of the diaphragm when passing through the hot pressing roll, so that the diaphragm is protected when the hot pressing roll hot presses the composite diaphragm on the monolithic negative pole piece; the protective film passes through the hot pressing roller, is tensioned by the tensioning roller, is wound on the material receiving roller, and is wound and recovered by the material receiving roller.
Preferably, the diaphragm and the single-sheet negative pole piece are subjected to surface thermal compounding between hot press rollers and then penetrate between two symmetrically arranged bonding rollers, and the bonding rollers are used for thermally compounding and bonding the diaphragms extending to the outer edge part of the single-sheet negative pole piece into a whole to form a continuous pole piece bag.
Preferably, the continuous pole piece bags are conveyed to the cutting mechanism forwards, and the cutting mechanism is used for sequentially cutting the diaphragm at the central line position of the gap between two adjacent monolithic negative pole pieces to form the negative pole piece bag.
Preferably, the positive electrode plate and the negative electrode plate bag are overlapped in the step S4, and the process in the step S4 sequentially comprises CCD alignment lamination, full-overlapping manipulator blanking, jig transfer transmission, battery encapsulation, OMM size detection, short circuit/thickness/weight detection and good product/NG battery blanking.
Preferably, in step S4, the positive electrode tab and the negative electrode tab pocket are aligned by the CCD, and then are stacked in a staggered manner to form the battery cell, wherein the two outer layers of the battery cell are the negative electrode tab pockets, respectively.
The invention has the beneficial effects that:
the invention designs a pole piece bag which is manufactured by sealing and coating a single pole piece by an upper layer of diaphragm and a lower layer of diaphragm, and forms a battery cell by aligning and superposing the pole piece and the pole piece bag, thereby solving the problem of diaphragm wrinkling, ensuring the position precision between a positive pole piece and a negative pole piece, simplifying the single diaphragm aligning procedure of the traditional lamination by adopting the diaphragm with the size larger than the size of the pole piece in the bag manufacturing process, effectively improving the lamination efficiency, reducing the short circuit and flammability condition and improving the battery cell thermal compounding manufacturing process with safety coefficient by using the diaphragm bag to block the direct contact of the pole piece in the diaphragm fully-coated single pole piece structure after the electrolyte is filled.
The invention belongs to a single-sheet stacking process, which integrally comprises a single-sheet manufacturing process, a pole piece bag making process and a battery core manufacturing process with two attributes.
The invention replaces the open type unit body structure which sequentially comprises the diaphragm, the negative pole piece, the diaphragm and the positive pole piece from top to bottom by creatively introducing the pole piece bag manufacturing process, thereby realizing the lamination of the single diaphragm; the problem that the quality of a battery core is influenced by wrinkling of the surface of the laminated diaphragm caused by the stress problem in the traditional strip diaphragm laminating process is solved; meanwhile, compared with the traditional single diaphragm and single anode and cathode pole piece process, the number of times of lamination of a single battery cell in the lamination section is reduced by more than one time, and the lamination efficiency is effectively improved. Meanwhile, compared with the problem that the positive pole piece and the negative pole piece are blindly stacked in the unit body structure process, the position accuracy of the positive pole piece and the negative pole piece in the unit body cannot be accurately ensured; meanwhile, the upper and lower layers of diaphragms extending outwards to the outer edge part of the pole piece are subjected to hot-pressing adhesion at the outer edge part to form a sealed bag body, and in the subsequent manufacturing of the battery cell, compared with the traditional technology for sealing the pole piece with one attribute, the pole piece bag disclosed by the invention has the advantages that the pole piece with one attribute is isolated, only one attribute pole piece of the battery cell is directly contacted with the electrolyte, so that the short circuit spontaneous combustion problem caused by two-stage conduction in the use process of the battery cell can be effectively reduced, and the safety performance of the battery cell is improved. In addition, in the pole piece bag making process, the upper and lower two layers of diaphragms need to be bonded from the outer edge to the outer side of the pole piece, so that the size of the diaphragm is larger than that of the pole piece in the diaphragm, the requirement on the diaphragm position accuracy is relatively low, an independent procedure is not needed for accurate diaphragm alignment, the traditional battery core making process is effectively simplified, and the battery core making efficiency is improved.
Specifically, the method comprises the following steps: compared with the battery core of the Korean LG company, the pole piece bag with the structure is adopted to replace the unit bodies of the LG company which sequentially comprise the diaphragm, the negative pole piece, the diaphragm and the positive pole piece from top to bottom, and in the process of manufacturing the pole piece bag, the pole piece bag with one attribute is only involved, so that the alignment of the positive pole piece and the negative pole piece is not needed; meanwhile, in the bag making process, the size of the diaphragm is larger than that of the pole piece, so that the diaphragm can extend to the outer edge of the pole piece in the horizontal plane and the upper diaphragm and the lower diaphragm are adhered to each other at the outer edge part, the requirement on the diaphragm alignment precision is lower, and a special diaphragm alignment procedure is not needed; therefore, in the integral manufacturing process of the battery cell, the CCD is aligned only when the pole piece and the pole piece bag are overlapped, and the lamination precision is effectively ensured.
Meanwhile, the three-layer structure is formed by manufacturing the pole piece bag once, and compared with the traditional battery core manufacturing process, the battery core manufacturing method has the advantages that the diaphragm stacking process, the negative pole piece stacking process, the diaphragm stacking process, the positive pole piece stacking process and the four-time stacking process are carried out; the invention can be completed only by two lamination processes of laminating the positive pole piece and the positive pole piece, the efficiency of the lamination manufacturing section is doubled, and the accumulated position error of multiple laminations can be reduced.
In addition, the pole piece belt manufacturing process is originally created, full coating of the diaphragm of the counter pole piece layer is achieved, compared with a traditional pole piece side part open type battery core, the battery core with one polarity in the battery core is completely coated by the diaphragm, after electrolyte is filled, the pole piece with only one polarity is directly communicated with electrolyte outside the battery core, the structure plays a role in protecting and blocking the pole pieces in the pole piece belt, short circuit and spontaneous combustion conditions caused by conduction of the pole pieces with different polarities in the battery core can be effectively avoided in the use process of the battery, and the safety coefficient of the use of the battery is improved.
In addition, aiming at the condition that the size of the current negative pole piece is larger than that of the current positive pole piece, the negative pole piece is preferably used as the manufactured pole piece in the pole piece bag, and the reason is that in the bag manufacturing process, when the upper and lower layers of diaphragms are hot rolled from the upper and lower sides of the edge of the pole piece to the middle part of the pole piece along the outline of the pole piece, the diaphragm is punctured by external reaction force generated by rolling the corners of the pole piece, so that the pole piece is exposed outside. The battery core internal state finally made in the process of laminating the pole piece and the pole piece bag up and down is still separated by the diaphragm between the positive pole piece and the negative pole piece, and the size of the negative pole piece is larger than that of the positive pole piece, the outer edge of the negative pole piece can extend to the outer side of the positive pole piece, so that the edge of the negative pole piece coated by the diaphragm is spaced from the side edge of the positive pole piece after lamination, the edge position of the negative pole piece can not contact with the positive pole piece, and the short circuit condition caused by the contact of the positive pole piece and the negative pole piece is avoided.
Drawings
FIG. 1 is a schematic diagram of the process steps of the present invention.
FIG. 2 is a schematic process flow diagram of FIG. 1.
Fig. 3 is a schematic flow chart of a bag making process in example 1 of the present invention.
Fig. 4 is a schematic flow chart of a bag making process in example 2 of the present invention.
Fig. 5 is a schematic diagram illustrating lamination of a pole piece and a pole piece pocket in a battery cell manufactured according to the present invention.
Fig. 6 is a second schematic diagram illustrating the lamination of a pole piece and a pole piece bag in a battery cell manufactured by the invention.
Fig. 7 is a cross-sectional view of a cell formed according to the present invention.
Fig. 8 is a schematic diagram of a pole piece pocket of a battery cell manufactured according to the present invention.
Fig. 9 is a schematic diagram illustrating lamination of a pole piece and a pole piece pocket in another cell manufactured according to the present invention.
Fig. 10 is a second schematic diagram illustrating lamination of a pole piece and a pole piece pocket in another cell manufactured according to the present invention.
Fig. 11 is a cross-sectional view of another cell formed according to the present invention.
Fig. 12 is a schematic diagram of a pole piece pouch of another cell made according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
example 1: as shown in fig. 1 to 3, the technical solution adopted in embodiment 1 of the present invention is as follows: a process for manufacturing a battery cell by thermal compounding comprises the following process steps:
s1, manufacturing a first pole piece: forming a first pole piece belt of a belt-shaped structure through a pole lug, and cutting the pole piece to form a single-piece first pole piece;
s2, preparing a second pole piece: forming a second pole piece belt of a belt-shaped structure with the polarity opposite to that of the first pole piece in the step S1 through a pole lug, and cutting the pole piece to form a second pole piece in a single sheet shape;
s3, pole piece bag making: in the process of linear transmission of the first or second single-sheet pole piece in the step S1 or S2, the front and back sides of the first or second pole piece are synchronously covered with strip-shaped diaphragms, the diaphragms on the two sides are respectively bonded with the front and back side walls of the first or second pole piece in a thermal compounding manner, the diaphragms on the front and back sides extend to the outer side of the first or second pole piece and are bonded with each other to form a continuous pole piece bag wrapping the first or second pole piece, and the continuous pole piece bag is cut into single pole piece bags;
s4, preparing a battery cell: when the first pole piece is used for making the bag in the step S3, the second pole piece in the step S2 and the single pole piece bag in the step S3 are overlapped in a staggered mode to form a battery cell; when the second pole piece is used for making the pouch in step S3, the first pole piece in step S1 and the single pole piece pouch in step S3 are overlapped in an interlaced manner to form a battery cell.
The first pole piece in the step S1 is a positive pole piece, and the process in the step S1 sequentially includes positive pole piece unwinding correction, tension caching, process correction, die forming of a tab, CCD detection of tab size, die cutting of a sheet material, CCD detection of a pole piece, positive pole piece blanking and positive pole piece caching.
The second pole piece in the step S2 is a negative pole piece, and the process in the step S2 sequentially includes negative pole piece unwinding correction, tension buffer, process correction, laser forming of a pole tab, CCD detection of the size of the pole tab, laser cutting of a sheet material, pole piece dust removal, and CCD detection of the size of the pole piece.
The pole piece bag making in the step S3 is a negative pole piece, and the process in the step S3 sequentially comprises the steps of pole piece and diaphragm compounding, pole piece and diaphragm protection film entering, pole piece preheating, pole piece hot pressing, pole piece short circuit testing, diaphragm size detection by a CCD (charge coupled device), diaphragm cutting by a die, negative pole piece bag blanking and negative pole piece bag caching.
In the step S3, the diaphragm material rolls 1 are respectively disposed on both sides of the monolithic negative electrode tab a1 that is linearly, horizontally and forwards transferred, and the diaphragms 2 on the diaphragm material rolls 1 are respectively pulled out along the transfer direction of the monolithic negative electrode tab a1 and pass through the hot press rolls 5 symmetrically disposed on both sides of the monolithic negative electrode tab a 1.
The two sides of the monolithic negative pole piece A1 are respectively provided with a protective film coil 3, a tension roller 7 and a material receiving roller 8, and a protective film 4 pulled out by the protective film coil 3 covers the surface of the diaphragm 2 when passing through the hot-pressing roller 5, so that the diaphragm 2 is protected when the hot-pressing roller 5 hot-presses the composite diaphragm 2 on the monolithic negative pole piece A1; the protective film 4 penetrates through the hot pressing roller 5, is tensioned by the tensioning roller 7, is wound on the material receiving roller 8, and is wound and recovered by the material receiving roller 8.
The diaphragm 2 and the single-sheet negative pole piece A1 pass through the two symmetrically arranged bonding rollers 6 after surface thermal compounding is completed between the hot pressing rollers 5, and the bonding rollers 6 thermally compound and bond the diaphragm 2 at two sides extending to the outer edge part of the single-sheet negative pole piece A1 into a whole to form a continuous pole piece bag.
The continuous pole piece bags are conveyed forwards to the cutting mechanism 9, the cutting mechanism 9 sequentially cuts the diaphragm 2 at the middle line position of the gap between two adjacent single-piece negative pole piece A1 to form a negative pole piece bag A2.
And in the step S4, the positive pole piece and the negative pole piece are mutually overlapped, and in the step S4, the process sequentially comprises CCD alignment lamination, full-overlapping manipulator blanking, jig transfer transmission, battery encapsulation, OMM size detection, short circuit/thickness/weight detection and good product/NG battery blanking.
In step S4, the positive electrode tab B and the negative electrode tab bag a2 are aligned by the CCD10 and then are stacked in a staggered manner to form a battery cell, wherein the two outer layers of the battery cell are the negative electrode tab bag a 2.
Furthermore, the invention designs a pole piece bag which is manufactured by sealing and coating a single pole piece by an upper layer of diaphragm and a lower layer of diaphragm, and forms a battery core by aligning and superposing the pole piece and the pole piece bag, thereby solving the problem of diaphragm wrinkling, ensuring the position precision between a positive pole piece and a negative pole piece, simplifying the single diaphragm aligning procedure of the traditional lamination by adopting the diaphragm with the size larger than the size of the pole piece in the bag manufacturing process, effectively improving the lamination efficiency, and the structure of the diaphragm fully coated single pole piece utilizes the diaphragm bag to block the pole piece in the diaphragm from directly contacting with the electrolyte after the electrolyte is filled, reducing the short circuit and flammability conditions, and improving the battery safety coefficient and the battery core thermal compounding manufacturing process.
The invention belongs to a single-sheet stacking process, which integrally comprises a single-sheet manufacturing process, a pole piece bag making process and a battery core manufacturing process with two attributes.
The invention replaces the open type unit body structure which sequentially comprises the diaphragm, the negative pole piece, the diaphragm and the positive pole piece from top to bottom by creatively introducing the pole piece bag manufacturing process, thereby realizing the lamination of the single diaphragm; the problem that the quality of a battery core is influenced by wrinkling of the surface of the laminated diaphragm caused by the stress problem in the traditional strip diaphragm laminating process is solved; meanwhile, compared with the traditional single diaphragm and single anode and cathode pole piece process, the number of times of lamination of a single battery cell in the lamination section is reduced by more than one time, and the lamination efficiency is effectively improved. Meanwhile, compared with the problem that the positive pole piece and the negative pole piece are blindly stacked in the unit body structure process, the position accuracy of the positive pole piece and the negative pole piece in the unit body cannot be accurately ensured; meanwhile, the upper and lower layers of diaphragms extending outwards to the outer edge part of the pole piece are subjected to hot-pressing adhesion at the outer edge part to form a sealed bag body, and in the subsequent manufacturing of the battery cell, compared with the traditional technology for sealing the pole piece with one attribute, the pole piece bag disclosed by the invention has the advantages that the pole piece with one attribute is isolated, only one attribute pole piece of the battery cell is directly contacted with the electrolyte, so that the short circuit spontaneous combustion problem caused by two-stage conduction in the use process of the battery cell can be effectively reduced, and the safety performance of the battery cell is improved. In addition, in the pole piece bag making process, the upper and lower two layers of diaphragms need to be bonded from the outer edge to the outer side of the pole piece, so that the size of the diaphragm is larger than that of the pole piece in the diaphragm, the requirement on the diaphragm position accuracy is relatively low, an independent procedure is not needed for accurate diaphragm alignment, the traditional battery core making process is effectively simplified, and the battery core making efficiency is improved.
Specifically, the method comprises the following steps: compared with the battery core of the Korean LG company, the pole piece bag with the structure is adopted to replace the unit bodies of the LG company which sequentially comprise the diaphragm, the negative pole piece, the diaphragm and the positive pole piece from top to bottom, and in the process of manufacturing the pole piece bag, the pole piece bag with one attribute is only involved, so that the alignment of the positive pole piece and the negative pole piece is not needed; meanwhile, in the bag making process, the size of the diaphragm is larger than that of the pole piece, so that the diaphragm can extend to the outer edge of the pole piece in the horizontal plane and the upper diaphragm and the lower diaphragm are adhered to each other at the outer edge part, the requirement on the diaphragm alignment precision is lower, and a special diaphragm alignment procedure is not needed; therefore, in the integral manufacturing process of the battery cell, the CCD is aligned only when the pole piece and the pole piece bag are overlapped, and the lamination precision is effectively ensured.
Meanwhile, the three-layer structure is formed by manufacturing the pole piece bag once, and compared with the traditional battery core manufacturing process, the battery core manufacturing method has the advantages that the diaphragm stacking process, the negative pole piece stacking process, the diaphragm stacking process, the positive pole piece stacking process and the four-time stacking process are carried out; the invention can be completed only by two lamination processes of laminating the positive pole piece and the positive pole piece, the efficiency of the lamination manufacturing section is doubled, and the accumulated position error of multiple laminations can be reduced.
In addition, the pole piece belt manufacturing process is originally created, full coating of the diaphragm of the counter pole piece layer is achieved, compared with a traditional pole piece side part open type battery core, the battery core with one polarity in the battery core is completely coated by the diaphragm, after electrolyte is filled, the pole piece with only one polarity is directly communicated with electrolyte outside the battery core, the structure plays a role in protecting and blocking the pole pieces in the pole piece belt, short circuit and spontaneous combustion conditions caused by conduction of the pole pieces with different polarities in the battery core can be effectively avoided in the use process of the battery, and the safety coefficient of the use of the battery is improved.
In addition, aiming at the condition that the size of the current negative pole piece is larger than that of the current positive pole piece, the negative pole piece is preferably used as the manufactured pole piece in the pole piece bag, and the reason is that in the bag manufacturing process, when the upper and lower layers of diaphragms are hot rolled from the upper and lower sides of the edge of the pole piece to the middle part of the pole piece along the outline of the pole piece, the diaphragm is punctured by external reaction force generated by rolling the corners of the pole piece, so that the pole piece is exposed outside. The battery core internal state finally made in the process of laminating the pole piece and the pole piece bag up and down is still separated by the diaphragm between the positive pole piece and the negative pole piece, and the size of the negative pole piece is larger than that of the positive pole piece, the outer edge of the negative pole piece can extend to the outer side of the positive pole piece, so that the edge of the negative pole piece coated by the diaphragm is spaced from the side edge of the positive pole piece after lamination, the edge position of the negative pole piece can not contact with the positive pole piece, and the short circuit condition caused by the contact of the positive pole piece and the negative pole piece is avoided.
The invention replaces the open type unit body structure which sequentially comprises the diaphragm, the negative pole piece, the diaphragm and the positive pole piece from top to bottom by creatively introducing the pole piece bag manufacturing process, thereby realizing the lamination of the single diaphragm; the problem that the quality of a battery core is influenced by wrinkling of the surface of the laminated diaphragm caused by the stress problem in the traditional strip diaphragm laminating process is solved; meanwhile, compared with the traditional single diaphragm and single anode and cathode pole piece process, the number of times of lamination of a single battery cell in the lamination section is reduced by more than one time, and the lamination efficiency is effectively improved. Meanwhile, compared with the problem that the positive pole piece and the negative pole piece are blindly stacked in the unit body structure process, the position accuracy of the positive pole piece and the negative pole piece in the unit body cannot be accurately ensured; meanwhile, the upper and lower layers of diaphragms extending outwards to the outer edge part of the pole piece are subjected to hot-pressing adhesion at the outer edge part to form a sealed bag body, and in the subsequent manufacturing of the battery cell, compared with the traditional technology for sealing the pole piece with one attribute, the pole piece bag disclosed by the invention has the advantages that the pole piece with one attribute is isolated, only one attribute pole piece of the battery cell is directly contacted with the electrolyte, so that the short circuit spontaneous combustion problem caused by two-stage conduction in the use process of the battery cell can be effectively reduced, and the safety performance of the battery cell is improved. In addition, in the pole piece bag making process, the upper and lower two layers of diaphragms need to be bonded from the outer edge to the outer side of the pole piece, so that the size of the diaphragm is larger than that of the pole piece in the diaphragm, the requirement on the diaphragm position accuracy is relatively low, an independent procedure is not needed for accurate diaphragm alignment, the traditional battery core making process is effectively simplified, and the battery core making efficiency is improved.
Specifically, the method comprises the following steps: compared with the battery core of the Korean LG company, the pole piece bag with the structure is adopted to replace the unit bodies of the LG company which sequentially comprise the diaphragm, the negative pole piece, the diaphragm and the positive pole piece from top to bottom, and in the process of manufacturing the pole piece bag, the pole piece bag with one attribute is only involved, so that the alignment of the positive pole piece and the negative pole piece is not needed; meanwhile, in the bag making process, the size of the diaphragm is larger than that of the pole piece, so that the diaphragm can extend to the outer edge of the pole piece in the horizontal plane and the upper diaphragm and the lower diaphragm are adhered to each other at the outer edge part, the requirement on the diaphragm alignment precision is lower, and a special diaphragm alignment procedure is not needed; therefore, in the integral manufacturing process of the battery cell, the CCD is aligned only when the pole piece and the pole piece bag are overlapped, and the lamination precision is effectively ensured.
Meanwhile, the three-layer structure is formed by manufacturing the pole piece bag once, and compared with the traditional battery core manufacturing process, the battery core manufacturing method has the advantages that the diaphragm stacking process, the negative pole piece stacking process, the diaphragm stacking process, the positive pole piece stacking process and the four-time stacking process are carried out; the invention can be completed only by two lamination processes of laminating the positive pole piece and the positive pole piece, the efficiency of the lamination manufacturing section is doubled, and the accumulated position error of multiple laminations can be reduced.
In addition, the pole piece belt manufacturing process is originally created, full coating of the diaphragm of the counter pole piece layer is achieved, compared with a traditional pole piece side part open type battery core, the battery core with one polarity in the battery core is completely coated by the diaphragm, after electrolyte is filled, the pole piece with only one polarity is directly communicated with electrolyte outside the battery core, the structure plays a role in protecting and blocking the pole pieces in the pole piece belt, short circuit and spontaneous combustion conditions caused by conduction of the pole pieces with different polarities in the battery core can be effectively avoided in the use process of the battery, and the safety coefficient of the use of the battery is improved.
In addition, aiming at the condition that the size of the current negative pole piece is larger than that of the current positive pole piece, the negative pole piece is preferably used as the manufactured pole piece in the pole piece bag, and the reason is that in the bag manufacturing process, when the upper and lower layers of diaphragms are hot rolled from the upper and lower sides of the edge of the pole piece to the middle part of the pole piece along the outline of the pole piece, the diaphragm is punctured by external reaction force generated by rolling the corners of the pole piece, so that the pole piece is exposed outside. The battery core internal state finally made in the process of laminating the pole piece and the pole piece bag up and down is still separated by the diaphragm between the positive pole piece and the negative pole piece, and the size of the negative pole piece is larger than that of the positive pole piece, the outer edge of the negative pole piece can extend to the outer side of the positive pole piece, so that the edge of the negative pole piece coated by the diaphragm is spaced from the side edge of the positive pole piece after lamination, the edge position of the negative pole piece can not contact with the positive pole piece, and the short circuit condition caused by the contact of the positive pole piece and the negative pole piece is avoided.
Example 2: as shown in fig. 4, a schematic diagram of a bag making process flow in embodiment 2 of the present invention is shown, and the production line in this embodiment has the same components as the production line in embodiment 1, and the difference is that the production line in this embodiment exchanges the order of the edge thermal compounding bag making process and the bag making process, that is, after the surface thermal compounding process is completed, the diaphragms are cut along the middle of the space between two adjacent pole pieces, and after the cutting is completed, the diaphragms on the upper and lower sides of the outer edge of the pole piece are subjected to edge thermal compounding along the outer contour of the pole piece by the bonding roller 6 to form a bag. The process comprises the steps of embodiment 1, cutting continuous diaphragms after edge thermal compounding, and due to the fact that stress exists in the continuous diaphragms after tensioning, the situation that the upper and lower diaphragms are bonded and then separated after variable-pressure thermal compounding due to the internal stress of the continuous diaphragms possibly occurs after the edge thermal compounding. However, because the diaphragm is made of flexible materials, the edges of the cut upper and lower layers of diaphragms are in a suspended state, and the problem that the thermal compounding quality of the subsequent edges is affected due to the fact that the surfaces of the edges of the diaphragms are bent and the like in the conveying process of conveying the cut diaphragms to the bonding roller 6 also exists.
As shown in fig. 5 to 8, a schematic diagram of a cell structure manufactured by the process of the present invention includes a pole piece bag and a second pole piece b, wherein the pole piece bag includes a first pole piece a1 and a diaphragm a2, the diaphragm a2 includes two pieces, and the two diaphragms a2 respectively horizontally cover the upper and lower surfaces of the first pole piece a1 and are bonded to the surface of the first pole piece a1 by thermal recombination; the diaphragm a2 horizontally extends to the outer edge of the first pole piece a1, the outer edge parts a3 of the diaphragms a2 on the upper and lower sides are bent towards the middle part along the outer contour of the first pole piece a1 and are thermally compounded and bonded together to form a closed pole piece bag which covers the first pole piece a 1; and after the electrode piece bag and the second electrode piece b are aligned by the CCD, the electrode piece bag and the second electrode piece b are overlapped in a staggered mode to form the battery cell. The membrane a2 is bonded by hot-rolling on the surface of the first pole piece a1 by a hot-rolling roller. The outer edge parts a3 of the two diaphragms a2 are bent around the surface of the first pole piece a1 by a hot pressing roller and pressed to the middle part of the first pole piece a1 by the hot pressing roller and are integrally bonded with each other. The first pole piece a1 is a negative pole piece, the second pole piece b is a positive pole piece, and the side edge of the first pole piece a1 extends to the outer side of the side edge of the second pole piece b. After the second pole piece b is overlapped with the pole piece bag, the outer side edge of the second pole piece b forms a distance with the outer side edge of the pole piece bag, so that the short circuit caused by the contact of a puncture part formed by the side edge angle of the first pole piece a1 puncturing the diaphragm a2 and the second pole piece b when the outer edge part a3 is bonded by hot rolling is avoided. The second pole piece b and the pole piece bag are overlapped to form a battery core, an electrolyte layer c is filled outside the battery core, the electrolyte layer c is directly contacted with the second pole piece b, and the first pole piece a1 is insulated and isolated from the second pole piece b and the electrolyte layer c through a diaphragm a2 outside the pole piece bag.
As shown in fig. 9 to 12, another schematic diagram of the cell structure manufactured by the process of the present invention is shown, in which a negative electrode plate is replaced by a positive electrode plate in a pole piece pocket of the cell, and the structure of the pole piece pocket is still the same as that of the cell in fig. 4, i.e., the pole piece pocket sequentially includes a diaphragm layer, a pole piece layer, and a diaphragm layer from bottom to top, only the property of the pole piece layer is replaced by the positive electrode plate, and correspondingly, the single pole piece during lamination is the negative electrode plate. Because the sizes of the positive pole piece and the negative pole piece are different, when the pole pieces and the pole piece bags are aligned and laminated by the CCD, the side corners of the pole piece bags are laminated and then are attached to the surface of the negative pole piece and are in direct contact with the negative pole piece, so that if a diaphragm at the corner position of the pole piece bag is punctured in the process of manufacturing the pole piece bag, the positive pole piece and the negative pole piece can be in direct contact, and short circuit is caused. When the negative pole piece is adopted as the pole piece layer of the pole piece bag in the battery core in fig. 4, the corners of the laminated pole piece bag are in a suspended state, that is, the laminated pole piece bag is not in contact with the surface of the positive pole piece. This cell is slightly less secure in terms of the safety factor with which it is made, compared to the cell in fig. 5.
The embodiments of the present invention are merely illustrative of specific embodiments thereof, and are not intended to limit the scope thereof. Since the present invention can be modified by a person skilled in the art, the present invention is not limited to the embodiments described above.
Claims (9)
1. A cell thermal compounding manufacturing process is characterized by comprising the following process steps:
s1, manufacturing a first pole piece: forming a first pole piece belt of a belt-shaped structure through a pole lug, and cutting the pole piece to form a single-piece first pole piece;
s2, preparing a second pole piece: forming a second pole piece belt of a belt-shaped structure with the polarity opposite to that of the first pole piece in the step S1 through a pole lug, and cutting the pole piece to form a second pole piece in a single sheet shape;
s3, pole piece bag making: in the process of linear transmission of the first or second single-sheet pole piece in the step S1 or S2, the front and back sides of the first or second pole piece are synchronously covered with strip-shaped diaphragms, the diaphragms on the two sides are respectively bonded with the front and back side walls of the first or second pole piece in a thermal compounding manner, the diaphragms on the front and back sides extend to the outer side of the first or second pole piece and are bonded with each other to form a continuous pole piece bag wrapping the first or second pole piece, and the continuous pole piece bag is cut into single-pole piece bags;
s4, preparing a battery cell: when the first pole piece is used for making the bag in the step S3, the second pole piece in the step S2 and the single pole piece bag in the step S3 are aligned by the CCD and are mutually staggered and superposed to form a battery cell; when the second pole piece is used for making the bag in the step S3, the first pole piece in the step S1 and the single pole piece bag in the step S3 are aligned by the CCD and are mutually staggered and superposed to form a battery cell;
the pole piece bag in the step S3 is made into a negative pole piece, the size of the negative pole piece is larger than that of the positive pole piece, the outer edge of the negative pole piece extends to the outer side of the positive pole piece, and two sides of the single-piece negative pole piece (A1) which is linearly, horizontally and forwards transmitted in the step S3 are respectively provided with a diaphragm (2);
surface thermal compounding is completed between the hot pressing roller (5) by the diaphragm (2) and the single-sheet negative pole piece (A1), the diaphragm passes through two symmetrically arranged bonding rollers (6), the bonding rollers (6) are used for bonding the diaphragm (2) on two sides of the outer edge part of the single-sheet negative pole piece (A1) into a whole in a thermal compounding way, a continuous pole piece bag is formed, the continuous pole piece bag is cut into a negative pole piece bag (A2), and the negative pole piece bag (A2) is a closed pole piece bag which covers the single-sheet negative pole piece (A1).
2. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: the first pole piece is the positive pole piece in the step S1, and the process in the step S1 sequentially comprises the steps of unwinding and deviation rectifying of the positive pole piece, tension caching, process deviation rectifying, die forming of a pole lug, CCD detection of the size of the pole lug, die cutting of a die into a sheet material, CCD detection of the pole piece, blanking of the positive pole piece and caching of the positive pole piece.
3. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: the second pole piece in the step S2 is a negative pole piece, and the process in the step S2 sequentially comprises the steps of unwinding and deviation rectifying of the negative pole piece, tension caching, process deviation rectifying, laser forming of the pole lug, CCD detection of the size of the pole lug, laser cutting of the pole piece, dust removal of the pole piece and CCD detection of the size of the pole piece.
4. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: the step S3 is characterized in that the process sequentially comprises the steps of compounding a pole piece and a diaphragm, putting the pole piece and the diaphragm into a protective film, preheating the pole piece, hot-pressing the pole piece, testing the short circuit of the pole piece, detecting the size of the diaphragm by a CCD (charge coupled device), cutting the diaphragm by a die, blanking a negative pole piece bag and caching the negative pole piece bag.
5. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: and in the step S3, diaphragm material rolls (1) are respectively arranged on two sides of the single-sheet negative pole piece (A1) which is linearly, horizontally and forwards conveyed, and diaphragms (2) on the diaphragm material rolls (1) are respectively pulled out along the conveying direction of the single-sheet negative pole piece (A1) and pass through hot pressing rollers (5) symmetrically arranged on two sides of the single-sheet negative pole piece (A1).
6. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: the two sides of the monolithic negative pole piece (A1) are respectively provided with a protective film material roll (3), a tensioning roll (7) and a material receiving roll (8), a protective film (4) pulled out by the protective film material roll (3) covers the surface of the diaphragm (2) when penetrating through the hot pressing roll (5), and the hot pressing roll (5) hot presses the protective film (4) to thermally compound the diaphragm (2) and the monolithic negative pole piece (A1); the protective film (4) passes through the hot pressing roller (5), is tensioned by the tensioning roller (7), is wound on the material receiving roller (8), and is wound and recovered by the material receiving roller (8).
7. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: the continuous pole piece bags are conveyed to the cutting mechanism (9) forwards, and the cutting mechanism (9) cuts the continuous pole piece bags at the position of the middle line of the gap between two adjacent single-sheet negative pole pieces (A1) one by one to form a negative pole piece bag (A2).
8. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: the positive pole piece and the negative pole piece bag are mutually overlapped in the step S4, and the process in the step S4 sequentially comprises CCD alignment lamination, full-overlapping mechanical arm blanking, jig transfer transmission, battery encapsulation, OMM size detection, short circuit/thickness/weight detection and good product/NG battery blanking.
9. The process for thermally compounding and manufacturing the battery cell according to claim 1, wherein: in the step S4, the positive electrode tab (B) and the negative electrode tab bag (a 2) are aligned by the CCD (10), and then are stacked in a staggered manner to form a battery cell, wherein the upper layer and the lower layer of the battery cell are the negative electrode tab bags (a 2), respectively.
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| CN114614104A (en) * | 2022-03-23 | 2022-06-10 | 上海兰钧新能源科技有限公司 | Lamination method and lithium battery |
| CN115411378A (en) * | 2022-09-14 | 2022-11-29 | 苏州天准科技股份有限公司 | Bag-making type laminated battery cell of composite positive electrode, production equipment and preparation method |
| CN115799597A (en) * | 2023-01-06 | 2023-03-14 | 深圳市兴禾自动化股份有限公司 | Pole piece thermal compounding mechanism and pole piece processing equipment |
| CN115832403B (en) * | 2023-01-06 | 2023-09-22 | 深圳市兴禾自动化股份有限公司 | Pole piece compounding equipment and battery core manufacturing equipment |
| CN116073076B (en) * | 2023-03-08 | 2023-06-20 | 中创新航科技(四川)有限公司 | Compounding method and compounding device for diaphragm and pole piece |
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