CN117239259A - Pre-lithium battery cell winding processing method - Google Patents
Pre-lithium battery cell winding processing method Download PDFInfo
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- CN117239259A CN117239259A CN202310948148.7A CN202310948148A CN117239259A CN 117239259 A CN117239259 A CN 117239259A CN 202310948148 A CN202310948148 A CN 202310948148A CN 117239259 A CN117239259 A CN 117239259A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 149
- 238000004804 winding Methods 0.000 title claims abstract description 137
- 238000003672 processing method Methods 0.000 title claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 137
- 238000005520 cutting process Methods 0.000 claims abstract description 62
- 239000011265 semifinished product Substances 0.000 claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000007731 hot pressing Methods 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims description 122
- 238000000034 method Methods 0.000 claims description 22
- 238000007493 shaping process Methods 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000007774 longterm Effects 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000001502 supplementing effect Effects 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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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
-
- 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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- Battery Electrode And Active Subsutance (AREA)
- Primary Cells (AREA)
Abstract
The invention discloses a winding processing method of a pre-lithium battery cell, which comprises the following steps: s1: sequentially winding the first diaphragm, the negative electrode plate, the second diaphragm and the positive electrode plate along the rotation direction of the winding needle to form a winding core semi-finished product without a lithium belt; s2: cutting the negative plate and the positive plate according to a set length, and superposing a first diaphragm and a second diaphragm to form a diaphragm assembly; s3: cutting a first lithium sheet to a fixed length, feeding one end of the first lithium sheet into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle to drive the diaphragm assembly to rotate so as to wind the first lithium sheet on the winding core semi-finished product; s4: cutting the first diaphragm and the second diaphragm, and finishing the manufacturing of the winding core after subsequent tape sticking and hot pressing; the winding processing method completes the addition of the lithium sheet in the manufacturing process of the winding core, and avoids the potential safety hazard caused by long-term exposure of the lithium sheet in the air.
Description
Technical Field
The invention relates to the technical field of lithium battery preparation, in particular to a winding processing method of a pre-lithium battery core.
Background
Lithium ion batteries have been widely used in recent years in new energy automobile power systems because of their high energy ratio and long life. The new energy battery industry continuously and rapidly develops in recent years, and cruising is also a problem of great concern for new energy automobile owners. The industry also places higher stringent demands on the safety performance and high energy density of batteries. In the current production of lithium ion batteries, when the battery is charged and discharged for the first time, a part of lithium ions are lost. It is necessary to offset this loss of lithium ions by means of pre-lithium to improve the capacity and cycle performance of the battery.
The conventional technical route is to add lithium-rich materials in the manufacturing process of the battery cell so as to achieve the effect of supplementing lithium ions. Generally, after the battery cell is manufactured, a procedure is additionally added, the lithium sheet which is cut in advance is placed on the upper surface and the lower surface of the battery cell, the battery cell and the lithium sheet winding procedure are integrated through the winding of the diaphragm, the efficiency is extremely low, the activity of lithium is high, and the lithium sheet which is cut in advance is exposed in the air for a long time, so that a certain safety risk exists.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a pre-lithium battery cell winding processing method, and the addition of lithium sheets is completed in the process of manufacturing a winding core, so that the potential safety hazard caused by long-term exposure of the lithium sheets to air is avoided.
The invention provides a winding processing method of a pre-lithium battery cell, which comprises the following steps:
s1: sequentially winding the first diaphragm, the negative electrode plate, the second diaphragm and the positive electrode plate along the rotation direction of the winding needle to form a winding core semi-finished product without a lithium belt;
s2: cutting the negative plate and the positive plate according to a set length, and superposing a first diaphragm and a second diaphragm to form a diaphragm assembly;
s3: cutting a first lithium sheet to a fixed length, feeding one end of the first lithium sheet into a gap included angle between a diaphragm assembly and a winding core semi-finished product, and enabling a winding needle to drive the diaphragm assembly to rotate so as to wind the first lithium sheet on the winding core semi-finished product, wherein when the first lithium sheet is fed into the gap included angle, the winding needle pauses to rotate along the rotation direction;
s4: cutting the first diaphragm and the second diaphragm, and performing subsequent adhesive tape pasting and hot pressing to finish the manufacturing of the winding core.
Further, the winding core semi-finished product is arranged in a middle horizontal mode and in radians of two sides, in the step S3, one or more first lithium sheets are wound on the same winding core semi-finished product, and the first lithium sheets are sequentially arranged at two opposite middle horizontal positions.
Further, the first lithium sheet takes copper foil as a base material, lithium metal is coated on one side or two sides of the first lithium sheet, and the thickness of the copper foil is 3-20um; the thickness of the lithium metal layer is 10-200um.
Further, the tab of the first lithium sheet does not contain a lithium metal coating and coincides with the tab of the negative electrode sheet.
Further, in step S1, the first diaphragm is obtained by unreeling the first diaphragm feeding mechanism;
the second diaphragm is obtained by unreeling a second diaphragm feeding mechanism;
the negative plate is obtained by unreeling a negative plate feeding mechanism;
the positive plate is obtained by unreeling through a positive plate feeding mechanism.
Further, a first cutting mechanism for cutting the first diaphragm, a second cutting mechanism for cutting the second diaphragm, a third cutting mechanism for cutting the negative plate and a fourth cutting mechanism for cutting the positive plate are arranged at the position close to the winding needle.
Further, a first shaping mechanism is arranged between the third cutting mechanism and the negative plate feeding mechanism, and a second shaping mechanism is arranged between the fourth cutting mechanism and the positive plate feeding mechanism.
Further, in step S2, the first lithium sheet is unwound by the lithium tape feeding mechanism, a fifth cutting mechanism for cutting the first lithium sheet is provided near the winding needle, and a third shaping mechanism is provided between the fifth cutting mechanism and the lithium tape feeding mechanism.
Further, the winding needle is positioned in the middle, and the first diaphragm feeding mechanism, the negative plate feeding mechanism, the second diaphragm feeding mechanism, the positive plate feeding mechanism and the lithium belt feeding mechanism are sequentially and adjacently arranged.
The winding processing method of the pre-lithium battery cell has the advantages that: according to the winding processing method of the pre-lithium battery cell, which is provided by the structure, the addition of the lithium sheet is completed in the manufacturing process of the winding core, so that the potential safety hazard caused by long-term exposure of the lithium sheet in the air is avoided; meanwhile, the pre-lithium winding core added with the lithium sheet, the positive electrode sheet, the negative electrode sheet and the diaphragm are subjected to hot pressing simultaneously, so that the integration is stronger, the position deviation can not occur in the subsequent assembly process, and the manufacturing qualification rate of the winding core is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic cross-sectional view of a pre-lithium winding core;
FIG. 3 is a schematic cross-sectional view of another pre-lithium winding core;
the lithium ion battery comprises a 10-first diaphragm feeding mechanism, a 20-negative electrode plate feeding mechanism, a 30-second diaphragm feeding mechanism, a 40-positive electrode plate feeding mechanism, a 50-lithium belt feeding mechanism, a 100-winding needle, a 101-first diaphragm, a 102-negative electrode plate, a 103-second diaphragm, a 104-positive electrode plate, a 501-first lithium plate and a 502-second lithium plate.
Detailed Description
In the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 3, the winding processing method of the pre-lithium battery cell provided by the invention comprises the following steps:
s1: sequentially winding a first diaphragm 101, a negative electrode plate 102, a second diaphragm 103 and a positive electrode plate 104 along the rotation direction of a winding needle 100 to form a winding core semi-finished product without a lithium belt;
for square lithium battery, the semi-finished product of the winding core is arranged horizontally in the middle and in radians on two sides, and the appearance is waist-shaped. The first diaphragm 101 and the second diaphragm 103 are single-sided or double-sided glue-coated diaphragms, and the materials of the negative electrode plate 102 and the positive electrode plate 104 are ternary or common battery material systems such as lithium iron phosphate, lithium manganate and the like.
The first diaphragm 101 is obtained through unreeling of the first diaphragm feeding mechanism 10, the first diaphragm unreeling system comprises a first diaphragm feeding mechanism 10, a first roller passing mechanism and a first cutting mechanism which are sequentially arranged, the first roller passing mechanism is composed of a plurality of roller passing mechanisms, a first deviation correcting component and a first tension component are arranged in the first roller passing mechanism, the first deviation correcting component and the first tension component are used for assisting stable conveying of the first diaphragm 101, the first diaphragm 10 unreeled by the first diaphragm feeding mechanism 10 is conveyed through the first roller passing mechanism, is wound on a winding needle 100 and is cut by the first cutting mechanism when unreeled to a set length.
The second diaphragm 103 is obtained by unreeling through a second diaphragm feeding mechanism 30, the second diaphragm unreeling system comprises a second diaphragm feeding mechanism 30, a second roller passing mechanism and a second cutting mechanism which are sequentially arranged, the second roller passing mechanism is composed of a plurality of roller passing mechanisms, a second deviation correcting component and a second tension component are arranged in the second roller passing mechanism, the second deviation correcting component and the second tension component are used for assisting stable conveying of the second diaphragm 103, the second diaphragm 103 unreeled by the second diaphragm feeding mechanism 30 is conveyed through the second roller passing mechanism, is wound on a winding needle 100 and is cut by the second cutting mechanism when unreeled to a set length.
The negative electrode plate 102 is obtained by unreeling a negative electrode plate feeding mechanism 20; the negative plate unreeling system comprises a negative plate feeding mechanism 20, a third roller passing mechanism, a first shaping mechanism and a third cutting mechanism which are sequentially arranged, wherein the third roller passing mechanism is composed of a plurality of roller passing mechanisms, a third deviation rectifying assembly and a third tension assembly are arranged in the third roller passing mechanism and used for assisting stable conveying of the negative plate 102, the negative plate 102 unreeled by the negative plate feeding mechanism 20 is conveyed through the third roller passing mechanism and shaped through the first shaping mechanism, wound on a winding needle 100 and cut through the third cutting mechanism when being unreeled to a set length, the first shaping mechanism can clamp the cut negative plate 102 so as to avoid the defect that one end of the cut negative plate 102 falls down to affect the next use, and in addition, a first clamping conveying mechanism can be arranged on one side of the first shaping mechanism and used for conveying the cut negative plate 102 to the position of the winding needle 100 again for next winding.
The positive plate 104 is obtained by unreeling through the positive plate feeding mechanism 40, the positive plate unreeling system comprises a positive plate feeding mechanism 40, a fourth roller passing mechanism, a second shaping mechanism and a fourth cutting mechanism which are sequentially arranged, the fourth roller passing mechanism is composed of a plurality of rollers, a fourth deviation rectifying component and a fourth tension component are arranged in the fourth roller passing mechanism, the fourth deviation rectifying component and the fourth tension component are used for assisting in stable conveying of the positive plate 104, the positive plate 104 unreeled by the positive plate feeding mechanism 40 is conveyed through the fourth roller passing mechanism and shaped through the second shaping mechanism, wound on the winding needle 100 and cut through the fourth cutting mechanism when being unreeled to a set length, the second shaping mechanism can clamp the cut positive plate 104 so as to avoid the defect that one end of the cut positive plate 104 falls down to affect the next use, and in addition, a second clamping conveying mechanism can be arranged on one side of the second shaping mechanism, and the cut positive plate 104 is conveyed to the position of the winding needle 100 again through the second clamping conveying mechanism for next winding.
S2: cutting the negative electrode plate 102 and the positive electrode plate 104 according to a set length, and superposing the first diaphragm 101 and the second diaphragm 103 to form a diaphragm assembly;
after the negative electrode sheet 102 and the positive electrode sheet 104 are cut, the formed winding core semi-finished product without the lithium band is formed by completely winding the negative electrode sheet 102 and the positive electrode sheet 104, and the first membrane 101 and the second membrane 103 are still in an unreeled state, so that the four-layer structure of the first membrane 101, the negative electrode sheet 102, the second membrane 103 and the positive electrode sheet 104 is changed into the two-layer structure of the first membrane 101 and the second membrane 103, and the first membrane 101 and the second membrane 103 are overlapped together as a membrane assembly to continue the subsequent winding operation.
S3: cutting a first lithium sheet 501 to a fixed length, feeding one end of the first lithium sheet 501 into a gap included angle between a diaphragm assembly and a winding core semi-finished product, and enabling a winding needle 100 to drive the diaphragm assembly to rotate so as to wind the first lithium sheet 501 on the winding core semi-finished product, wherein when the first lithium sheet 501 is fed into the gap included angle, the winding needle 100 pauses rotating along a rotating direction;
the first lithium sheet 501 uses copper foil as a base material, lithium metal is coated on one side or two sides, and the thickness of the copper foil is 3-20um; the thickness of the lithium metal layer is 10-200um; the tab of the first lithium sheet 501 does not contain a lithium metal coating and coincides with the tab position of the negative electrode sheet 102.
The first lithium sheet 501 is obtained by unreeling through a lithium belt feeding mechanism 50, the lithium belt unreeling system comprises a mechanism 50, a fifth roller passing mechanism, a third shaping mechanism and a fifth cutting mechanism, the fifth roller passing mechanism is composed of a plurality of roller passing mechanisms, a fifth deviation correcting component and a fifth tension component are arranged in the fifth roller passing mechanism, the fifth deviation correcting component and the fifth tension component are used for assisting in stable conveying of the first lithium sheet 501, the first lithium sheet 501 unreeled by the lithium belt feeding mechanism 50 is conveyed through the fifth roller passing mechanism and shaped through the third shaping mechanism, is wound on a core semi-finished product without a lithium belt, and is cut through the fifth cutting mechanism when unreeled to a set length.
The diaphragm assembly formed by overlapping the first diaphragm 101 and the second diaphragm 103 in the step S2 is taken as a basis, at this time, the diaphragm assembly forms a certain angle with the outer surface of the winding core semi-finished product in the winding process, and one end of the first lithium sheet 501 is inserted into the clearance angle for fixing, so that the first lithium sheet 501 can be arranged on the outer surface of the winding core semi-finished product without displacement in the winding process along with the diaphragm assembly, and therefore, the winding of the first lithium sheet 501 is realized, and for square batteries, in order to exert the lithium supplementing effect of the first lithium sheet 501, the first lithium sheet 501 is arranged at the horizontal position of the winding core semi-finished product, and the lithium supplementing operation is carried out on the battery core to a greater extent.
It should be noted that, during the process of inserting the first lithium sheet 501 into the gap angle, the winding needle 100 pauses winding, and after the first lithium sheet 501 is inserted, the winding needle 100 starts the winding operation, so that the first lithium sheet 501 can be wound on the outer surface of the core semi-finished product during the movement of the winding needle 100.
In particular, in order to effectively supplement lithium to both sides of the prismatic battery, a second lithium sheet 502 is inserted into a position of the winding core semi-finished product opposite to the first lithium sheet 501, and the insertion and winding of the second lithium sheet 502 are identical to those of the first lithium sheet 501; meanwhile, multiple layers of first lithium pieces 501 or second lithium pieces 502 may be respectively disposed on two sides of the core semi-finished product (the lithium pieces on the same side of the core semi-finished product are used as the first lithium pieces 501 or the second lithium pieces 502).
The winding needle is divided into a left part and a right part, and the first diaphragm winding system, the negative electrode plate winding system, the positive electrode plate winding system, the second diaphragm winding system and the lithium belt winding system are clamped at the same time. The winding needle 100 is positioned in the middle, and the first diaphragm feeding mechanism 10, the negative electrode plate feeding mechanism 20, the second diaphragm feeding mechanism 30, the positive electrode plate feeding mechanism 40 and the lithium belt feeding mechanism 50 are sequentially and adjacently arranged.
S4: cutting the first diaphragm 101 and the second diaphragm 103, and finishing the manufacturing of the winding core after subsequent tape pasting and hot pressing;
the first diaphragm 101 and the second diaphragm 103 are cut through the first cutting mechanism and the second cutting mechanism, and the adhesive tape pasting and hot pressing procedures can be realized by adopting the existing winding core forming structure.
According to the steps S1 to S4, the addition of the lithium sheet is completed in the manufacturing process of the winding core, so that the potential safety hazard caused by long-term exposure of the lithium sheet to air is avoided; meanwhile, the pre-lithium winding core added with the lithium sheet, the positive electrode sheet, the negative electrode sheet and the diaphragm are subjected to hot pressing simultaneously, so that the integration is stronger, the position deviation can not occur in the subsequent assembly process, and the manufacturing qualification rate of the winding core is improved.
Steps S1 to S4 are processes for disposing lithium sheets on one side of the core semi-finished product, and a process for disposing one or more lithium sheets on both sides of the core semi-finished product is described below.
A first embodiment is shown in fig. 1 and 2:
s11: sequentially winding a first diaphragm 101, a negative electrode plate 102, a second diaphragm 103 and a positive electrode plate 104 along the rotation direction of a winding needle 100 to form a winding core semi-finished product without a lithium belt;
s12: cutting the negative electrode plate 102 and the positive electrode plate 104 according to a set length, and superposing the first diaphragm 101 and the second diaphragm 103 to form a diaphragm assembly;
s13: cutting the first lithium sheet 501 to a fixed length, feeding one end of the first lithium sheet 501 into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle 100 to drive the diaphragm assembly to rotate for half a turn so as to wind the first lithium sheet 501 in the horizontal direction of the winding core semi-finished product;
s14: cutting a second lithium sheet 502 to a fixed length, feeding one end of the second lithium sheet 502 into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle 100 to drive the diaphragm assembly to rotate for half a circle so as to wind the second lithium sheet 502 on the horizontal direction of the winding core semi-finished product;
s15: cutting the first diaphragm 101 and the second diaphragm 103, and performing subsequent tape pasting and hot pressing to finish the winding core manufacturing.
Through steps S11 to S15, a process of respectively setting one lithium sheet on both sides of the winding core semi-finished product is realized.
A second embodiment is shown in fig. 1 and 2:
s21: sequentially winding a first diaphragm 101, a negative electrode plate 102, a second diaphragm 103 and a positive electrode plate 104 along the rotation direction of a winding needle 100 to form a winding core semi-finished product without a lithium belt;
s22: cutting the negative electrode plate 102 and the positive electrode plate 104 according to a set length, and superposing the first diaphragm 101 and the second diaphragm 103 to form a diaphragm assembly;
s23: cutting the first lithium sheet 501 to a fixed length, feeding one end of the first lithium sheet 501 into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle 100 to drive the diaphragm assembly to rotate for half a turn so as to wind the first lithium sheet 501 in the horizontal direction of the winding core semi-finished product;
s24: cutting a second lithium sheet 502 to a fixed length, feeding one end of the second lithium sheet 502 into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle 100 to drive the diaphragm assembly to rotate for half a circle so as to wind the second lithium sheet 502 on the horizontal direction of the winding core semi-finished product;
s25: steps S23 to S24 are repeated until the insertion of one or more first lithium sheets 501 and one or more second lithium sheets 502, respectively, is completed.
S26: cutting the first diaphragm 101 and the second diaphragm 103, and performing subsequent tape pasting and hot pressing to finish the winding core manufacturing.
Through steps S21 to S26, the process of respectively arranging more than one lithium sheet on the two sides of the winding core semi-finished product is realized.
A third embodiment is shown in fig. 1 and 3:
s31: sequentially winding a first diaphragm 101, a negative electrode plate 102, a second diaphragm 103 and a positive electrode plate 104 along the rotation direction of a winding needle 100 to form a winding core semi-finished product without a lithium belt;
s32: cutting the negative electrode plate 102 and the positive electrode plate 104 according to a set length, and superposing the first diaphragm 101 and the second diaphragm 103 to form a diaphragm assembly;
s33: cutting the first lithium sheet 501 to a fixed length, feeding one end of the first lithium sheet 501 into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle 100 to drive the diaphragm assembly to rotate for half a turn so as to wind the first lithium sheet 501 in the horizontal direction of the winding core semi-finished product;
s34: cutting a second lithium sheet 502 to a fixed length, feeding one end of the second lithium sheet 502 into a gap included angle between the diaphragm assembly and the winding core semi-finished product, and enabling the winding needle 100 to drive the diaphragm assembly to rotate for half a circle so as to wind the second lithium sheet 502 on the horizontal direction of the winding core semi-finished product;
s35: the negative electrode sheet 102 is sent between the first diaphragm 101 and the winding core semi-finished product after the step S34, the positive electrode sheet 104 is sent between the second diaphragm 103 and the first diaphragm 101, and the steps S31 to 34 are repeated until one or more first lithium sheets 501 and one or more second lithium sheets 502 are respectively added and wound;
s36: cutting the first diaphragm 101 and the second diaphragm 103, and performing subsequent tape pasting and hot pressing to finish the winding core manufacturing.
Through steps S31 to S36, the process of respectively arranging more than one lithium sheet on the two sides of the winding core semi-finished product is realized.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. The winding processing method of the pre-lithium battery cell is characterized by comprising the following steps of:
s1: sequentially winding a first diaphragm (101), a negative electrode plate (102), a second diaphragm (103) and a positive electrode plate (104) along the rotation direction of a winding needle (100) to form a winding core semi-finished product without a lithium belt;
s2: cutting the negative plate (102) and the positive plate (104) according to a set length, and superposing the first diaphragm (101) and the second diaphragm (103) to form a diaphragm assembly;
s3: cutting a first lithium sheet (501) to a fixed length, feeding one end of the first lithium sheet (501) into a gap included angle between a diaphragm assembly and a winding core semi-finished product, and enabling a winding needle (100) to drive the diaphragm assembly to rotate so as to wind the first lithium sheet (501) on the winding core semi-finished product, wherein when the first lithium sheet (501) is fed into the gap included angle, the winding needle (100) pauses to rotate along a rotation direction;
s4: cutting the first diaphragm (101) and the second diaphragm (103), and performing subsequent tape pasting and hot pressing to finish the winding core manufacturing.
2. The method for winding a pre-lithium battery cell according to claim 1, wherein the winding core semi-finished product is provided with a middle level and two side radians, and in step S3, one or more first lithium sheets (501) are wound on the same winding core semi-finished product, and the first lithium sheets (501) are sequentially provided at two opposite middle level positions.
3. The method for winding the pre-lithium battery cell according to claim 1, wherein the first lithium sheet (501) uses copper foil as a base material, lithium metal is coated on one side or both sides, and the thickness of the copper foil is 3-20um; the thickness of the lithium metal layer is 10-200um.
4. A method of winding a pre-lithium battery cell according to claim 3, wherein the tab of the first lithium sheet (501) does not contain a lithium metal coating and coincides with the tab position of the negative electrode sheet (102).
5. The pre-lithium cell winding process according to claim 1, characterized in that in step S1, the first separator (101) is obtained by unreeling by a first separator feeding mechanism (10);
the second diaphragm (103) is obtained by unreeling a second diaphragm feeding mechanism (30);
the negative plate (102) is obtained by unreeling a negative plate feeding mechanism (20);
the positive plate (104) is obtained by unreeling a positive plate feeding mechanism (40).
6. The method according to claim 5, wherein a first cutting mechanism for cutting the first separator (101), a second cutting mechanism for cutting the second separator (103), a third cutting mechanism for cutting the negative electrode sheet (102), and a fourth cutting mechanism for cutting the positive electrode sheet (104) are provided near the winding needle (100).
7. The method according to claim 6, wherein a first shaping mechanism is provided between the third cutting mechanism and the negative electrode sheet feeding mechanism (20), and a second shaping mechanism is provided between the fourth cutting mechanism and the positive electrode sheet feeding mechanism (40).
8. The method according to claim 5, wherein in step S2, the first lithium sheet (501) is unwound by a lithium tape feeding mechanism (50), a fifth cutting mechanism for cutting the first lithium sheet (501) is provided near the winding needle (100), and a third shaping mechanism is provided between the fifth cutting mechanism and the lithium tape feeding mechanism (50).
9. The method for winding the pre-lithium battery cell according to claim 8, wherein the winding needle (100) is positioned in the middle, and the first diaphragm feeding mechanism (10), the negative electrode plate feeding mechanism (20), the second diaphragm feeding mechanism (30), the positive electrode plate feeding mechanism (40) and the lithium belt feeding mechanism (50) are sequentially and adjacently arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310948148.7A CN117239259A (en) | 2023-07-31 | 2023-07-31 | Pre-lithium battery cell winding processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310948148.7A CN117239259A (en) | 2023-07-31 | 2023-07-31 | Pre-lithium battery cell winding processing method |
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| CN117239259A true CN117239259A (en) | 2023-12-15 |
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| CN202310948148.7A Pending CN117239259A (en) | 2023-07-31 | 2023-07-31 | Pre-lithium battery cell winding processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118073668A (en) * | 2024-04-19 | 2024-05-24 | 中能瑞新(深圳)能源科技有限公司 | Sectional winding method, winding core and winding battery |
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2023
- 2023-07-31 CN CN202310948148.7A patent/CN117239259A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118073668A (en) * | 2024-04-19 | 2024-05-24 | 中能瑞新(深圳)能源科技有限公司 | Sectional winding method, winding core and winding battery |
| CN118073668B (en) * | 2024-04-19 | 2024-07-19 | 中能瑞新(深圳)能源科技有限公司 | Sectional winding method, winding core and winding battery |
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