CN115332542B - Battery core pole piece substrate and pole piece production equipment - Google Patents
Battery core pole piece substrate and pole piece production equipment Download PDFInfo
- Publication number
- CN115332542B CN115332542B CN202211248591.5A CN202211248591A CN115332542B CN 115332542 B CN115332542 B CN 115332542B CN 202211248591 A CN202211248591 A CN 202211248591A CN 115332542 B CN115332542 B CN 115332542B
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- pole piece
- cutting
- precutting
- foil
- line
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/72—Grids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention relates to the technical field of power batteries, and provides a battery core pole piece substrate which comprises a foil, a coating area arranged on the foil and white parts arranged on two sides of the coating area; the coating area is provided with a cutting line, and the blank part is provided with a precutting line. This electric core pole piece substrate through set up the part tangent line on the foil to set up the line in advance on leaving white portion, follow the part tangent line and carry out the mechanical cutting back with the line in advance, can directly pass through modes such as laser cutting, the border part of keeping away from the foil from leaving white portion is perpendicular and cut with the line both ends in advance, thereby forms utmost point ear, cuts the waste material district, the required stroke of laser cutting in the follow-up course of working that reduces, thereby improves cutting efficiency, reduction in production cost.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a battery core pole piece base material and pole piece production equipment.
Background
In the course of working at lamination pole piece, need at first with coating electrode material on the substrate to carry out the roll-in through the compression roller to the pole piece, make firm attached to on the substrate of electrode material, the pole piece is divided into two through the hobbing cutter cutting in the middle of the pole piece that the compression is accomplished, and both sides are because need utmost point ear to adopt laser cutting usually, leave utmost point ear after cutting off blank area.
The prior art discloses a method for laser flaking a lithium battery pole piece with publication number CN110666446A, which comprises the steps of compacting a pole piece dressing and a metal coiled material through rolling, and then cutting out a pole lug through laser cutting, wherein the laser cutting stroke is long, so that gas raw materials such as carbon dioxide, nitrogen and the like consumed in the cutting process are increased, and meanwhile, the production and processing efficiency of the pole piece is low due to the fact that the laser cutting speed is low and the pole piece is influenced by the cutting stroke.
Disclosure of Invention
In view of the above, the invention provides a cell pole piece substrate and pole piece production equipment, which reduce the subsequent laser cutting stroke, reduce the production cost and improve the processing efficiency by pre-cutting a foil, and simultaneously reduce the length of a production line and the equipment cost by synchronously operating rolling and cutting.
The technical scheme of the invention is realized as follows:
on one hand, the battery pole piece substrate comprises a foil, a coating area arranged on the foil and white parts arranged on two sides of the coating area; wherein the content of the first and second substances,
the coating area is provided with a parting line, and the blank part is provided with a precutting line.
On the basis of the above technical solution, preferably, the extension direction of the dividing line is the same as the length direction of the foil, the number of the precut lines is multiple, and the plurality of precut lines are arranged at equal intervals along the length direction of the blank part.
On the basis of the above technical solution, preferably, the distance between each precut line and the adjacent coating zone is 0-3mm.
In addition to the above technical solution, preferably, the width of the margin is 10 to 15mm.
On the basis of the technical scheme, preferably, the distance between every two adjacent precut lines in the length direction of the foil is 10-25mm.
On the other hand, the invention provides pole piece production equipment which is used for pressing electrode coating on a coating area of the battery core pole piece base material and comprises an upper roller and a lower roller, wherein the upper roller comprises a slitting cutting ring and two precutting cutting rings, wherein,
the cutting ring cutter is positioned in the middle of the upper roller and is used for cutting a cutting line on the battery cell pole piece substrate;
the two pre-cutting ring cutters are respectively positioned at two ends of the upper roller in the length direction and are used for cutting a pre-cutting line on the blank leaving part.
On the basis of the technical scheme, preferably, the upper roll further comprises a compression roller and two mounting assemblies, wherein the two mounting assemblies are respectively fixed with the two precutting cutting rings and are respectively detachably fixed at two ends of the compression roller.
On the basis of the technical scheme, preferably, the lower roller is provided with three cutting grooves, and the three cutting grooves are respectively in one-to-one correspondence with the splitting cutting ring knife and the two pre-cutting ring knives.
On the basis of the technical scheme, preferably, resistance reducing layers are arranged outside the upper roller and the lower roller and are used for contacting electrode paint.
Further preferably, the resistance reducing layer is a teflon coating.
Compared with the prior art, the battery cell pole piece substrate and the pole piece production equipment have the following beneficial effects:
(1) The battery cell pole piece substrate is provided with the parting line on the foil, the precutting line is arranged on the blank part, and after mechanical cutting is carried out along the parting line and the precutting line, the edge part of the blank part far away from the foil can be directly cut vertically and at two ends of the precutting line in a laser cutting mode and the like, so that a tab is formed, a waste material area is cut off, and the required stroke of laser cutting in the subsequent processing process is reduced, so that the cutting efficiency is improved, and the production cost is reduced;
(2) When the pole piece production equipment is used for processing the cell pole piece base material, the pole piece production equipment can directly cut the cell pole piece base material along a cutting line and a precutting line through the cutting ring knife and the two precutting ring knives when pressing is carried out, so that the precutting and pressing steps are carried out simultaneously, and the production line length and the equipment cost can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cell pole piece substrate according to the present invention;
FIG. 2 is a perspective view of the pole piece manufacturing apparatus of the present invention;
FIG. 3 is a side view of the pole piece manufacturing apparatus of the present invention;
FIG. 4 is an exploded view of the pole piece manufacturing apparatus mounting assembly of the present invention;
fig. 5 is a side view of a pre-cut ring cutter of the pole piece manufacturing equipment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the cell pole piece substrate of the present invention includes a foil 1, the foil 1 is a coiled aluminum foil or copper foil, a direction in which a pulled-out end of the foil 1 enters a production line is a length direction of the foil 1, and the foil 1 is provided with four coating areas 2, a slitting line 3, and two blank portions 4.
The four coating areas 2 are respectively located on two sides of the foil 1, namely the four coating areas 2 are respectively arranged on two sides of the foil 1 in the thickness direction, and in the processing process, the electrode material is covered on the coating areas 2 in a coating mode, so that the electrode material is firmly attached to the foil 1 through subsequent pressing.
The parting line 3 is positioned on one side adjacent to the two coating areas 2 on the same side, the extending direction of the parting line 3 is the same as the length direction of the foil 1, the parting line 3 is positioned in the middle of the foil 1, the foil 1 can be divided into two parts through the parting line 3, and meanwhile, the two coating areas 2 on the same side are separated from the electrode material pressed on the coating areas 2.
The two blank portions 4 are respectively located at two ends of the foil 1 far from the dividing line 3, after the foil 1 is divided into two parts by the dividing line 3, the two blank portions 4 are respectively located on the two parts, meanwhile, a plurality of precut lines 41 are arranged on the blank portions 4, the precut lines 41 are distributed at equal intervals along the length direction of the foil 1, the blank portions 4 are composed of a plurality of tabs and waste material areas, the tabs and the waste material areas are sequentially arranged in a staggered mode to form the blank portions 4, the precut lines 41 are arranged on the waste material areas in a one-to-one correspondence mode, two ends of the precut lines 41 are perpendicular to the precut lines 41, the blank portions 4 are cut through laser, the waste material areas can be cut off, the remaining portions connected to the coating area 2 are tabs of the electrode plates, the electrode plates can be obtained by cutting perpendicular to the precut lines 41 along the width direction of the foil 1, attention needs to be paid, when the precut lines 41 are cut perpendicular to the precut lines 41, each precut line 41 only corresponds to one-time, if the electrode plates are cut perpendicular to the middle of the precut lines 41, the electrode plates are located in the middle of the electrode plates, and the electrode plates are prevented from being cut, and the electrode plates from being deviated in the cutting process of a machine, and the electrode plate cutting process of cutting, which is prevented from being affected by the electrode cutting machine.
In the above embodiment, if the dividing lines 3 are irregular and arranged along the length direction of the foil 1, the side of the formed pole piece far from the tab will be formed into the shape corresponding to the dividing lines 3.
As a preferred embodiment, the distance between each precut line 41 and the adjacent coating area 2 is 0-3mm, when the distance between the precut line 41 and the adjacent coating area 2 is zero, the distance from one end of the tab far away from the coating area 2 to the coating area 2 will be equal to the width of the margin 4, which is the longest protruding length of the tab, whereas when the distance between the precut line 41 and the adjacent coating area 2 is 3mm, the protruding length of the tab will be correspondingly reduced, the tab is too short, which will increase the difficulty of subsequent lamination and other processing processes, and the distance between the precut line 41 and the adjacent coating area 2 is too small, which may cause waste of raw materials due to cutting precision deviation and affect the stability of the electrode materials pressed on the coating area 2.
As a preferred embodiment, the width of the blank part 4 is 10-15mm, the width of the blank part 4 is the range of the protruding length of the tab, the width of the blank part 4 is less than 10mm, the tab may be too short, which affects subsequent processing, and the width of the blank part 4 is greater than 15mm, which may result in excessive waste material cutting and waste of a large amount of raw materials, and it should be noted that, in the prior art, the protruding length of the tab on the pole piece is generally about 10 mm.
As a preferred embodiment, the distance between two adjacent precut lines 41 in the length direction of the foil 1 is 10-25mm, that is, the length of the tab in the length direction of the foil 1 is 10-25mm, this length interval is the protruding width range of the tab in the prior art, and the specific length of the tab in the length direction of the foil 1 can be determined according to specific application scenarios and the like.
The specific principle of the battery cell pole piece substrate is as follows: after the mechanical cutting is carried out along the parting line 3 and the precutting line 41, the edge part of the foil 1 is kept away from the blank part 4 and the two ends of the precutting line 41 are cut vertically in a laser cutting mode and the like, so that a tab is formed, a waste material area is cut, the required stroke of laser cutting is reduced in the subsequent processing process, the cutting efficiency is improved, and the production cost is reduced.
As shown in fig. 1 to 5, the pole piece production equipment of the present invention is used for laminating an electrode coating on the coating area 2 of the above-mentioned electric core pole piece substrate, and includes an upper roller 5 and a lower roller 6, a certain space is left between the upper roller 5 and the lower roller 6, the space is about half of the thickness of the electrode material coated on the coating area 2 of the foil 1, when the foil 1 and the electrode material pass through, the electrode material is laminated on the foil 1, the upper roller 5 includes a slitting ring cutter 51 and two precutting ring cutters 52, the slitting ring cutter 51 is located in the middle of the upper roller 5, when the upper roller 5 and the lower roller 6 laminate the foil 1 and the electrode material, a parting line 3 is cut on the electric core pole piece substrate, so as to divide the foil 1 into two parts, the two precutting ring cutters 52 are respectively located at two ends of the length direction of the upper roller 5, the upper roller 5 and the lower roller 6 laminate the foil 1 and the electrode material, and simultaneously, a parting line 41 is cut on the remaining part 4, the slitting ring cutter 51 and the two precutting ring cutters 52 are both made of stainless steel or the like, and a full-arc-cutting gap is formed between the outer sides of the arc-shaped cutting ring cutters 52, so that an arc-shaped cutting gap is formed between the arc-shaped cutting ring cutter, and the arc-shaped cutting ring cutters 41 is formed.
It should be noted that, in order to prevent the upper roller 5 and the lower roller 6 from deforming along the length direction when extruding the electrode material, which would affect the cutting precision of the tab, and the waste material region cannot be completely cut off from the tab, the length of the precutting line 41 needs to be slightly smaller than that of the waste material region, that is, the length of the cutting arc is smaller than that of the waste material region, cutting is performed by an L-shaped cutting method, so that after the foil 1 is deformed to a small extent, the cutting path can still be butted to the precutting line 41, and the waste material region is cut off, where the specific cutting path is shown as a dotted line portion in fig. 1.
As a preferred embodiment, the upper roller 5 further includes a pressing roller 53 and two mounting assemblies 54, the two mounting assemblies 54 are respectively fixed to the two pre-cutting ring cutters 52 and respectively detachably fixed to two ends of the pressing roller 53, and by selecting the mounting assemblies 54 with different widths, the distance between the pre-cutting ring cutters 52 and the pressing roller 53 can be changed, so as to adjust the distance between the pre-cutting line 41 and the slitting line 3.
Specifically, the mounting assembly 54 includes a long screw, a mounting portion and an adjusting portion, the precutting cutting ring 52 and the mounting portion are sequentially arranged along the length direction of the pressing roller 53, the long screw is used for fixing the adjusting portion, the precutting cutting ring 52 and the mounting portion on the pressing roller 53, and the position adjustment of the precutting cutting ring 52 can be completed by replacing the adjusting portions with different thicknesses.
As a preferred embodiment, the lower roller 6 is provided with three cutting grooves 61, and the three cutting grooves 61 correspond to the splitting ring cutter 51 and the two pre-cutting ring cutters 52 one by one, so that the splitting ring cutter 51 and the two pre-cutting ring cutters 52 can be respectively inserted into the three cutting grooves 61 during the cutting process to perform the cutting in a matching manner, thereby avoiding incomplete cutting and separation and affecting subsequent processing operations.
As a preferred embodiment, resistance reducing layers 7 are arranged outside the upper roller 5 and the lower roller 6, the resistance reducing layers 7 are used for contacting electrode coatings, the resistance reducing layers 7 contact electrode materials, and press-fit the electrode materials on the foil 1, so that the electrode materials can be prevented from being adhered to the upper roller 5 and the lower roller 6, and meanwhile, the phenomenon that the electrode materials are unevenly pressed and distributed due to overlarge friction force in the extrusion process, and the production quality of the pole piece is poor is prevented.
Specifically, the resistance reducing layer 7 is a teflon coating, and can be directly arranged on the upper roller 5 and the lower roller 6 in a coating mode, or a sleeve made of the teflon coating is arranged on the teflon coating, and the teflon coating is a nose of a non-stick coating, combines heat resistance, chemical inertness, excellent insulation stability and low friction, and has the comprehensive advantage that other coatings cannot resist.
The working principle of the pole piece production equipment is as follows: the upper roller 5 and the lower roller 6 continuously roll to extrude the passing foil 1, so that the electrode material coated on the foil 1 is pressed and firmly adhered on the foil 1, and the electrode material is cut on the electrode sheet base material along the cutting line 3 and the precutting line 41 by the slitting cutting ring 51 and the two precutting cutting rings 52 while being pressed and adhered.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (9)
1. The utility model provides a pole piece production facility for with electrode coating pressfitting to electric core pole piece substrate on, its characterized in that: the battery core pole piece substrate comprises a foil (1), a coating area (2) arranged on the foil (1) and white parts (4) arranged on two sides of the coating area (2), wherein a parting line (3) is arranged on the coating area (2), a precutting line (41) is arranged on the white parts (4), the pole piece production equipment comprises an upper roller (5) and a lower roller (6), the upper roller (5) and the lower roller (6) are used for laminating an electrode coating to the coating area (2), the upper roller (5) comprises a slitting cutting ring cutter (51) and two precutting cutting ring cutters (52), wherein,
the slitting ring cutter (51) is positioned in the middle of the upper roller (5) and is used for cutting the slitting line (3) on the cell pole piece base material;
the two precutting cutting rings (52) are respectively located at two ends of the upper roll (5) in the length direction, avoidance holes are formed in the outer sides of the precutting cutting rings (52), so that a C-shaped cutting arc is formed in the outer sides of the precutting cutting rings (52), and the precutting cutting rings (52) are used for cutting the precutting lines (41) in the blank parts (4).
2. The pole piece production apparatus of claim 1, wherein: the extension direction of the dividing line (3) is the same as the length direction of the foil (1), the number of the precutting lines (41) is multiple, and the precutting lines (41) are arranged at equal intervals along the length direction of the blank leaving part (4).
3. The pole piece production apparatus of claim 1, wherein: the distance between each precut line (41) and the adjacent coating area (2) is 0-3mm.
4. The pole piece production apparatus of claim 1, wherein: the width of the white part (4) is 10-15mm.
5. The pole piece production apparatus of claim 1, wherein: the distance between two adjacent precut lines (41) in the length direction of the foil (1) is 10-25mm.
6. The pole piece production apparatus of claim 1, wherein: the upper roll (5) further comprises a press roll (53) and two mounting assemblies (54), wherein the two mounting assemblies (54) are respectively fixed with the two precutting cutting rings (52) and respectively detachably fixed at two ends of the press roll (53).
7. The pole piece production apparatus of claim 1, wherein: the lower roll (6) is provided with three cutting grooves (61), and the three cutting grooves (61) are respectively in one-to-one correspondence with the splitting cutting ring knife (51) and the two pre-cutting ring knives (52).
8. The pole piece production apparatus of claim 1, wherein: the resistance reducing layer (7) is arranged outside the upper roller (5) and the lower roller (6), and the resistance reducing layer (7) is used for contacting electrode paint.
9. The pole piece production apparatus of claim 8, wherein: the resistance reducing layer (7) is a Teflon coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211248591.5A CN115332542B (en) | 2022-10-12 | 2022-10-12 | Battery core pole piece substrate and pole piece production equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211248591.5A CN115332542B (en) | 2022-10-12 | 2022-10-12 | Battery core pole piece substrate and pole piece production equipment |
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| Publication Number | Publication Date |
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| CN115332542A CN115332542A (en) | 2022-11-11 |
| CN115332542B true CN115332542B (en) | 2023-04-07 |
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| CN202211248591.5A Active CN115332542B (en) | 2022-10-12 | 2022-10-12 | Battery core pole piece substrate and pole piece production equipment |
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| JP2007329050A (en) * | 2006-06-08 | 2007-12-20 | Mitsubishi Cable Ind Ltd | Sheet type battery and its manufacturing method |
| JP2008066050A (en) * | 2006-09-06 | 2008-03-21 | Matsushita Electric Ind Co Ltd | Manufacturing method of electrode plate for lithium secondary battery |
| KR20080058772A (en) * | 2006-12-22 | 2008-06-26 | 에스케이에너지 주식회사 | Manufacturing method of electrode for battery |
| JP5383571B2 (en) * | 2010-03-26 | 2014-01-08 | 三菱重工業株式会社 | Electrode plate manufacturing equipment |
| JP5757414B2 (en) * | 2010-08-18 | 2015-07-29 | 株式会社Ｇｓユアサ | Battery electrode sheet and manufacturing method thereof |
| WO2012059982A1 (en) * | 2010-11-02 | 2012-05-10 | トヨタ自動車株式会社 | Coating method and coating apparatus |
| JP5772397B2 (en) * | 2011-08-30 | 2015-09-02 | 株式会社Ｇｓユアサ | Battery electrode manufacturing method and battery electrode |
| JP2016001575A (en) * | 2014-06-12 | 2016-01-07 | 株式会社デンソー | Method for manufacturing electrode |
| JP6690486B2 (en) * | 2016-01-06 | 2020-04-28 | 株式会社豊田自動織機 | Electrode manufacturing equipment |
| JP2018018678A (en) * | 2016-07-27 | 2018-02-01 | 株式会社豊田自動織機 | Method for manufacturing power storage device and power storage device |
| KR102162773B1 (en) * | 2016-10-07 | 2020-10-07 | 주식회사 엘지화학 | Method for Manufacturing Electrode for Secondary Battery Comprising Pre-Slitting Process |
| JP6809139B2 (en) * | 2016-10-31 | 2021-01-06 | 株式会社豊田自動織機 | Electrode manufacturing equipment |
| KR102549528B1 (en) * | 2019-05-09 | 2023-06-30 | 주식회사 엘지에너지솔루션 | The Electrode And The Method For Manufacturing Thereof |
| CN210730683U (en) * | 2019-08-29 | 2020-06-12 | 宁德时代新能源科技股份有限公司 | Pole piece preparation system |
| CN111660015A (en) * | 2020-06-18 | 2020-09-15 | 昆山聚创新能源科技有限公司 | Laser die cutting method for pole piece |
| JP7275173B2 (en) * | 2021-01-29 | 2023-05-17 | プライムプラネットエナジー＆ソリューションズ株式会社 | Method for manufacturing secondary battery and secondary battery |
| CN115020630A (en) * | 2022-06-23 | 2022-09-06 | 三一技术装备有限公司 | Pole piece and pole piece unit processing method, pole piece, battery and pole lug roller cutting device |
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