CN116053403A - Pole piece, pole piece mother board, processing method of pole piece and battery - Google Patents
Pole piece, pole piece mother board, processing method of pole piece and battery Download PDFInfo
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- CN116053403A CN116053403A CN202211741155.1A CN202211741155A CN116053403A CN 116053403 A CN116053403 A CN 116053403A CN 202211741155 A CN202211741155 A CN 202211741155A CN 116053403 A CN116053403 A CN 116053403A
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- 238000003672 processing method Methods 0.000 title claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 126
- 239000000463 material Substances 0.000 claims abstract description 60
- 239000013543 active substance Substances 0.000 claims abstract description 30
- 239000011149 active material Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 22
- 238000005406 washing Methods 0.000 claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims 3
- 239000011888 foil Substances 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 102100029469 WD repeat and HMG-box DNA-binding protein 1 Human genes 0.000 description 2
- 101710097421 WD repeat and HMG-box DNA-binding protein 1 Proteins 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to a pole piece, a pole piece mother board, a processing method of the pole piece and a battery. The utility model provides a pole piece, includes the electric current collector, and electric current collector thickness direction's both sides all include material district, washing district and first attenuate district, and the washing district is used for the welded end of welding utmost point ear, and one side of washing district along the width direction of pole piece is equipped with first attenuate district, and first attenuate district and the adjacent setting of corresponding washing district and extend to the corresponding side edge of pole piece, and first attenuate district and material district have the same active material, and the thickness of first attenuate district is less than or equal to the thickness of material district and the difference of the thickness of homonymy utmost point ear. Under the premise of ensuring the welding quality of the current collector at the lug and the cleaning area, a notch is not needed to be punched, the current collector at the first thinning area is reserved, the mechanical strength of the pole piece is higher, and the belt breakage risk during pole piece winding can be reduced. And the first thinning area is also provided with the same active substance as the material area, so that compared with the prior art, the battery capacity is larger, and the first thinning area is not required to be pasted with gummed paper in the subsequent process.
Description
Technical Field
The invention relates to the technical field of pole pieces, in particular to a pole piece, a pole piece mother board, a processing method of the pole piece and a battery.
Background
The processing method of the pole piece structure in the pole lug of the conventional winding type lithium ion battery is shown in fig. 1: in the step of cleaning the tab slot 2 in a large roll, a plurality of tab slots 2 are formed on a material area motherboard 42 of a tab motherboard 4 in a cleaning mode along the width direction of the tab, the current collector motherboard 41 is exposed at the tab slot 2, then the tab motherboard 4 is cut along the length direction of the tab, in an ideal state, the tab motherboard 4 is directly cut at the edge position of the tab slot 2, but due to the cutting tolerance, when the fluid motherboard 41 is in a slitting forming process of the tab, the edge position of the tab slot 2 is not cut, when in a slitting cutting process, as shown by a cutting line 5 in fig. 1, a material area of 1mm-2mm is reserved at one side of the tab slot 2 corresponding to the cutting of the tab, and then a notch 3 is formed after the punching and penetrating of the reserved tab portion at the material area, so that the tab can be well welded with the current collector 11 at the tab slot 2, and the welding quality is ensured. The pole piece processed by the method comprises a current collector 11, material areas 12 on two sides of the current collector 11, lug grooves 2 on two sides of the current collector 11 and notches 3, the lugs can be well welded with the current collector 11 at the lug grooves 2 due to the presence of the notches 3, welding quality is guaranteed, but the mechanical strength of the pole piece is reduced due to the fact that the pole piece is punched with a notch, so that the risk of breakage exists when the pole piece is wound, the pole piece is easily damaged due to the punching process, and the yield of the pole piece is easily affected.
Disclosure of Invention
The invention aims at: aiming at the problems that in the prior art, a gap is required to be formed by punching, so that the mechanical strength of the pole piece is low, and the risk of breakage exists when the pole piece is wound, the pole piece, a pole piece motherboard, a processing method of the pole piece and a battery are provided.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a pole piece, includes the current collector, current collector thickness direction's both sides all include material district, washing district and first attenuate district, the washing district is used for the welding end of welding utmost point ear, the washing district is equipped with along the width direction's of pole piece one side first attenuate district, first attenuate district with correspond the washing district is adjacent to be set up and extend to the corresponding side edge of pole piece, first attenuate district with the material district has the same active material, the thickness of first attenuate district is less than or equal to the thickness of material district with homonymy the difference of the thickness of utmost point ear.
The electrode lugs are welded in the cleaning area, and the parts of the electrode lugs entering the pole piece horizontal area are all positioned in the first thinning area and the cleaning area; the electrode lugs are not extruded on the material area 12 of the electrode plates which are not cleaned, so that the problem that the electrode lugs cannot be welded with the current collector 11 in the cleaning area or the welding quality of the electrode lugs with the current collector 11 at the cleaning area is poor is avoided.
The pole piece, the current collector, the material area, the cleaning area and the like can be the same as those in the prior art. The first thinning area is arranged on one side, close to the lug, of the cleaning area, and the first thinning area and the material area are provided with the same active substances and are of the same structure, and the first thinning area is formed after the material area is thinned in thickness. The thickness of the first thinning area is smaller than or equal to the difference between the thickness of the material area and the thickness of the lug on the same side, under the thickness condition, the lug can be directly attached to the first thinning area and welded with the current collector at the cleaning area, the welding quality of the lug and the current collector at the cleaning area is not affected, the thickness of a battery core is not affected, and the first thinning area is arranged to replace a notch part in the prior art, so that a pole piece in the scheme does not need to be punched, the current collector at the first thinning area is reserved, the mechanical strength of the pole piece is higher, and the breakage risk of the pole piece during winding can be reduced. Besides, as the first thinning area is provided with the active substance which is the same as that of the material area, compared with the pole piece active substance in the prior art, the volume of the battery can be increased, and the active substance exists in the first thinning area, no gummed paper is needed in the subsequent process, and the working procedures are fewer. And need not die-cut breach, the yields of pole piece is higher.
Preferably, the thickness of the first thinning area is greater than or equal to the particle size of the active material, so that the exposed foil caused by the excessive thickness of the first thinning area is avoided.
Preferably, when the difference between the thickness of the material region and the thickness of the tab on the same side is greater than or equal to the particle size of the active material, the thickness of the first thinning region is the difference between the thickness of the material region and the thickness of the tab on the same side, and on the basis of ensuring the welding quality that the tab is attached to the first thinning region and welded to the cleaning region, a thicker active material layer of the first thinning region is reserved as much as possible, so that the battery capacity is increased.
Preferably, the cleaning area and the first thinning area are rectangular in cross section, so that the processing is facilitated.
Preferably, the cleaning area and the first thinning area have the same size along the length direction of the pole piece, so that the cleaning area and the corresponding first thinning area can be processed synchronously.
Preferably, the other side of the cleaning area along the width direction of the pole piece is provided with a second thinning area.
The pole piece motherboard is used for cutting and forming a plurality of pole pieces, and a second thinning area is arranged on the other side of the cleaning area of the pole piece along the width direction of the pole piece;
the pole piece mother board comprises a current collector mother board, wherein both sides of the thickness direction of the current collector mother board comprise a material area mother board, a plurality of cleaning areas and thinning areas corresponding to the cleaning areas, all the thinning areas are respectively arranged on the same sides of the cleaning areas along the width direction of the pole piece, the thinning areas are adjacently arranged with the cleaning areas, all the cleaning areas are arranged on the pole piece mother board along the width direction of the pole piece at intervals, the size of the thinning areas along the width direction of the pole piece is larger than the scalar sum of positive and negative tolerances of a cutting tool, and the thinning areas can be cut along the length direction of the pole piece to form a first thinning area and a second thinning area of an adjacent pole piece.
The pole piece mother board in the scheme is similar to the conventional pole piece mother board in structure, and is provided with a current collector mother board, a material area mother board and a plurality of cleaning areas, wherein the same sides of all the cleaning areas are provided with thinning areas, the size of the thinning areas along the width direction of the pole piece is larger than the scalar sum of positive and negative tolerances of a cutting tool, the cutting position of the cutting tool is always in the range of the thinning areas, the thinning areas can be cut along the length direction of the pole piece to form a first thinning area and a second thinning area of an adjacent pole piece, and then the pole piece with the first thinning area and the second thinning area is formed, and the first thinning area can be matched with the corresponding cleaning area to ensure the welding quality of the pole piece. By adopting the scheme, the pole piece mother board can be cut rapidly and in batches to form the pole piece in the application, a notch is not needed to be punched, and the yield of the pole piece is higher.
Preferably, the dimension of the thinning area along the width direction of the pole piece is smaller than or equal to the scalar sum of positive and negative tolerances of the cutting tool plus 2mm. The size of the thinning area along the width direction of the pole piece is too large, so that the active material capacity of the pole piece can be influenced, and when the size of the thinning area along the width direction of the pole piece is smaller than or equal to the scalar sum of positive and negative tolerances of a cutting tool and 2mm, the influence on the active material capacity of the pole piece can be reduced, and the pole piece mother board can be conveniently cut synchronously to form the pole piece.
The processing method of the pole piece is used for processing the pole piece, and a second thinning area is arranged on the other side of the cleaning area of the pole piece along the width direction of the pole piece;
the processing method of the pole piece comprises the following steps:
s1, processing the pole piece mother board;
s2, cutting the pole piece through the thinning area along the length direction of the pole piece to form a first thinning area and a second thinning area of the adjacent pole piece, and finishing the pole piece processing.
By adopting the processing method of the pole piece, the pole piece disclosed by the application can be rapidly produced in batches, a notch is not required to be punched, and the yield of the pole piece is higher.
Preferably, in step S1, the cleaning area of the pole piece mother board and the corresponding thinning area are cleaned synchronously, so that the processing of the cleaning area and the corresponding thinning area is more convenient, and the cleaning steps are reduced.
Preferably, the step of synchronously cleaning the cleaning area and the corresponding thinning area of the pole piece motherboard comprises the following steps:
dividing the cleaning area into at least two times along the thickness direction of the pole piece, and cleaning each time along the width direction of the pole piece, wherein at least one time of cleaning covers the plane range of the thinning area.
In the above manner, the active material to be cleaned in the cleaning region is cleaned in layers in the thickness direction, and then at least one cleaning process extends and covers the planar range of the thinning region, so that the number of times the thinning region is cleaned is smaller than that of the cleaning region, and when the active material layer in the cleaning region is cleaned and the current collector motherboard is exposed, at least one unwashed active material layer still remains in the thinning region. By adopting the mode to synchronously clean the cleaning area and the corresponding thinning area of the pole piece motherboard, the construction process can be reduced, and the cleaning tool is prevented from being adjusted or added for multiple times.
A battery comprises a shell, a cap and a battery cell;
the battery cell comprises a negative electrode plate, a diaphragm and a positive electrode plate, wherein the positive electrode plate and/or the negative electrode plate adopt the electrode plates, and the negative electrode plate, the diaphragm and the positive electrode plate are stacked and wound into a winding body;
the shell is provided with a mounting groove, the battery cell is arranged in the mounting groove, and the cap is plugged in the notch of the mounting groove.
Adopt above-mentioned battery, the positive pole piece and/or the negative pole piece of its electric core adopt this application the pole piece, replace prior art's breach part through setting up first attenuate district, so the pole piece need not die-cut breach, and the mass flow body of first attenuate district department is kept for the mechanical strength of pole piece is higher, can reduce the broken area risk when pole piece is convoluteed. Besides, as the first thinning area is provided with the active substance which is the same as that of the material area, compared with the pole piece active substance in the prior art, the volume of the battery can be increased, and the active substance exists in the first thinning area, no gummed paper is needed in the subsequent process, and the working procedures are fewer. And need not die-cut breach, the yields of pole piece is higher. The capacity of the battery is higher, the quality is better, and the volume can be kept in a normal state.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the pole piece, the gap of the existing pole piece is replaced by the first thinning area arranged on the side, close to the pole lug, of the cleaning area, the thickness of the first thinning area is smaller than or equal to the difference between the thickness of the material area and the thickness of the pole lug on the same side, and under the condition of the thickness, the pole lug can be directly attached to the first thinning area and welded with the current collector at the cleaning area, and the welding quality of the pole lug and the current collector at the cleaning area is not affected, so that the pole piece in the scheme does not need to punch the gap, the current collector at the first thinning area is reserved, the mechanical strength of the pole piece is higher, and the belt breakage risk during pole piece winding can be reduced. Besides, as the first thinning area is also provided with the active substance which is the same as that of the material area, compared with the pole piece active substance in the prior art, the volume of the battery can be increased, and the active substance exists in the first thinning area, no gummed paper is needed in the subsequent process, the procedures are fewer, and the cost can be saved. And need not die-cut breach, the yields of pole piece is higher.
2. According to the pole piece, the thickness of the first thinning area is larger than or equal to the particle size of the active substance, so that the exposed foil caused by the excessive thickness of the first thinning area is avoided. When the difference between the thickness of the material region and the thickness of the tab on the same side is larger than or equal to the particle size of the active material, the thickness of the first thinning region is the difference between the thickness of the material region and the thickness of the tab on the same side, and on the basis of ensuring the welding quality that the tab is attached to the first thinning region and welded to the cleaning region, the thicker active material layer of the first thinning region is reserved as much as possible, so that the battery capacity is increased.
3. According to the pole piece mother board, the thinning areas are arranged on the same side of all the cleaning areas, the size of each thinning area along the width direction of the pole piece is larger than the scalar sum of positive and negative tolerances of the cutting tool, so that the cutting position of the cutting tool can be always within the range of the thinning areas, the thinning areas can be cut along the length direction of the pole piece to form a first thinning area and a second thinning area of an adjacent pole piece, further, the pole piece with the first thinning area and the second thinning area is formed, the first thinning area can be matched with the corresponding cleaning area to ensure the welding quality of the pole piece, the pole piece can be quickly and batched cut to form the pole piece in the invention, a punching notch is not needed, and the yield of the pole piece is higher.
4. The processing method of the pole piece can rapidly produce the pole piece in batches, does not need to punch gaps, and has higher yield.
5. According to the processing method of the pole piece, the cleaning area and the corresponding thinning area of the pole piece mother board are cleaned synchronously, active substances required to be cleaned in the cleaning area are cleaned in a layered manner in the thickness direction, and then the process of at least one cleaning extends and covers the plane range of the thinning area, so that the number of times of cleaning the thinning area is smaller than that of the cleaning area, and when the active substance layer in the cleaning area is cleaned and exposes out of the current collector mother board, at least one non-cleaned active substance layer remains in the thinning area, so that the construction procedure can be reduced, and multiple adjustment of cleaning tools or addition of the cleaning tools to the cleaning tools are avoided.
6. According to the battery, the positive electrode plate and/or the negative electrode plate of the battery core are/is higher in mechanical strength, the belt breakage risk during winding of the electrode plate can be reduced, the first thinning area is provided with the active substances identical to the material area, the active substances of the positive electrode plate and/or the negative electrode plate are more, the capacity of the battery is higher, the quality of the battery is better, the thickness of the battery core is not increased, and the volume of the battery can be kept in a normal state.
Drawings
FIG. 1 is a schematic illustration of the processing of a prior art pole piece;
the icon in fig. 1: 11-current collector; 12-material area; 2-tab slots; 3-notch; 4-pole piece mother board; 41-a current collector motherboard; 42-material area mother board; 5-cutting line.
FIG. 2 is a schematic plan view of the pole piece described in example 1;
FIG. 3 is a schematic cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view at B-B in FIG. 2;
FIG. 5 is a schematic cross-sectional view taken at C-C of FIG. 2;
FIG. 6 is a schematic cross-sectional view taken at D-D in FIG. 2;
FIG. 7 is a schematic view of the welding of the pole piece to the tab described in example 1;
FIG. 8 is a schematic plan view of the mother plate of the pole piece in example 2;
fig. 9 is a schematic diagram of cutting the mother sheet of the electrode sheet in example 2.
The icons in fig. 2-9: 11-current collector; 12-material area; 2-a cleaning zone; 3-thinning areas; 31-a first thinning region; 32-a second thinning region; 4-pole piece mother board; 41-a current collector motherboard; 42-material area mother board; 5-cutting line; and 6-electrode lugs.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment provides a pole piece, referring to fig. 2-6, the left-right direction of fig. 2 is the length direction of the pole piece, the up-down direction is the width direction of the pole piece, and the inner-outer direction is the thickness direction of the pole piece; the left-right direction of fig. 3-6 is the length direction of the pole piece, and the up-down direction is the thickness direction of the pole piece.
In this embodiment, as shown in fig. 2-6, the pole piece includes a current collector 11, both sides of the thickness direction of the current collector 11 include a material region 12, a cleaning region 2, and a first thinning region 31, and the cleaning region 2 is used for welding a welding end of the tab 6, as shown in fig. 7. As shown in fig. 2, the cleaning region 2 is provided with the first thinning region 31 at one side along the width direction of the pole piece, the first thinning region 31 is disposed adjacent to the cleaning region 2 and extends to the corresponding side edge of the pole piece, the first thinning region 31 and the material region 12 have the same active material, and the thickness of the first thinning region 31 is less than or equal to the difference between the thickness of the material region 12 and the thickness of the tab 6 at the same side.
When the tab 6 is welded to the cleaning area 2, as shown in fig. 7, the portion of the tab 6 entering the pole piece horizontal area should be located in the first thinning area 31 and the cleaning area 2; the electrode lug 6 can not be extruded on the material area 12 of the electrode piece which is not cleaned, and the problem that the electrode lug 6 can not be welded with the current collector 11 in the cleaning area 2 or the welding quality of the electrode lug and the current collector 11 at the cleaning area 2 is poor is avoided.
The pole piece, the current collector 11, the material area 12, the cleaning area 2 and the like can be the same as the prior art, and the current collector 11 is copper foil or aluminum foil and the like; the material region 12 is composed of an active material, and is coated on both sides of the current collector 11 in the thickness direction; the cleaning region 2 is a region where the active material is directly exposed to the current collector 11 after cleaning, as shown in fig. 4. As shown in fig. 2, by providing the first thinning area 31 on the side of the cleaning area 2, which is disposed toward the tab 6, the first thinning area 31 and the material area 12 have the same active material, and are the same structure, but the first thinning area 31 is formed after thinning in the thickness of the material area 12, as shown in fig. 3. The thickness of the first thinned region 31 is smaller than or equal to the difference between the thickness of the material region 12 and the thickness of the tab 6 on the same side, as shown in fig. 3, the thickness of the upper material region 12 is reduced by the thickness of the tab 6 on the upper side or the thickness of the tab 6 on the upper side should be greater than or equal to the thickness of the first thinned region 31 on the upper side. Under the condition of the thickness, the tab 6 can be directly attached to the first thinning area 31 and welded with the current collector 11 at the cleaning area 2, as shown in fig. 7, the welding quality of the tab 6 and the current collector 11 at the cleaning area 2 is not affected, the tab 6 does not protrude outwards to the material area 12 at the same side, the thickness of the battery core is not affected, and the volume of the battery is not affected.
In this embodiment, since the first thinning area 31 is provided to replace the notch portion in the prior art, the pole piece in this embodiment does not need to be punched with a notch, and the current collector 11 at the first thinning area 31 is retained, so that the mechanical strength of the pole piece is higher, and the risk of breakage of the pole piece during winding can be reduced. Besides, because the first thinning region 31 is also provided with the active substance which is the same as that of the material region 12, compared with the pole piece active substance in the prior art, the volume of the battery can be increased, and the active substance exists in the first thinning region 31, no gummed paper is needed in the subsequent process, and the working procedures are fewer. And need not die-cut breach, the yields of pole piece is higher.
As shown in fig. 3, in this embodiment, the thickness of the first thinning region 31 is preferably greater than or equal to the particle size of the active material, so that the exposure of the foil due to the excessively thin thickness of the first thinning region 31, that is, the exposure of the current collector 11 at the first thinning region 31, the need for rubberizing in the later stage, and the reduction of the processing cost are avoided. And when the difference between the thickness of the material region 12 and the thickness of the tab 6 on the same side is greater than or equal to the particle size of the active material, the thickness of the first thinning region 31 is the difference between the thickness of the material region 12 and the thickness of the tab 6 on the same side, and on the basis of ensuring the welding quality that the tab 6 is attached to the first thinning region 31 and welded to the cleaning region 2, a thicker active material layer of the first thinning region 31 is reserved as much as possible, so that the battery capacity is increased. If the particle size of the active material is 10um, when the difference between the thickness of the material region 12 and the thickness of the tab 6 on the same side is greater than or equal to 10um, the thickness of the first thinning region 31 is the difference between the thickness of the material region 12 and the thickness of the tab 6 on the same side; when the difference between the thickness of the material region 12 and the thickness of the tab 6 on the same side is smaller than 10um, the thickness of the first thinning region 31 is 10um.
In the present embodiment, the first thinning-out region 31 and the cleaning region 2 are not limited. But for the convenience of processing, and the capacity of the active position of the pole piece can be better guaranteed, the cleaning area 2 and the first thinning area 31 are both suitable to be rectangular in cross section, and the cleaning area 2 and the first thinning area 31 are the same in size along the length direction of the pole piece, so that the cleaning area 2 and the corresponding first thinning area 31 can be processed synchronously.
In this embodiment, as shown in fig. 2 and fig. 6, the other side of the cleaning area 2 of the pole piece along the width direction of the pole piece is provided with a second thinning area 32, the second thinning area 32 and the first thinning area 31 are located at two sides of the cleaning area 2, and the widths of the two areas are the same, which is mainly formed by batch processing of the pole piece mother board 4.
Example 2
The present embodiment provides a pole piece motherboard for cutting to form a plurality of pole pieces described in embodiment 1, referring to fig. 8 and 9, the left-right direction is the length direction of the pole piece, and the up-down direction is the width direction of the pole piece. The other side of the cleaning zone 2 of the pole piece in the width direction of the pole piece is provided with a second thinning zone 32, as shown in fig. 2.
The pole piece mother board 4 comprises a current collector mother board 41, the current collector mother board 41 is copper foil or aluminum foil, and the like, and both sides of the current collector mother board 41 in the thickness direction comprise a material area mother board 42, a plurality of cleaning areas 2 and thinning areas 3 corresponding to the cleaning areas 2, wherein the material area mother board 42 is composed of active substances, and the thinning areas 3 are also composed of active substances and are thinned compared with the material area mother board 42 in thickness. All the thinning areas 3 are respectively disposed on the same side of the cleaning area 2 along the width direction of the pole piece, as shown in fig. 8, and the thinning areas 3 are all disposed on the upper side of the cleaning area 2. The thinning areas 3 are arranged adjacent to the cleaning areas 2, all the cleaning areas 2 are arranged on the pole piece mother board 4 at intervals along the width direction of the pole piece, the size of the thinning areas 3 along the width direction of the pole piece is larger than the scalar sum of positive and negative tolerances of a cutting tool, and the thinning areas 3 can be cut along the length direction of the pole piece to form a first thinning area 31 and a second thinning area 32 of the adjacent pole piece. If the positive tolerance and the negative tolerance of the cutting tool are +1mm and-1 mm respectively, the dimension of the thinning area 3 along the width direction of the pole piece is larger than 2mm.
The pole piece mother board in this embodiment is a structure when a single pole piece is not cut, similar to a conventional pole piece mother board in structure, including a current collector mother board 41, a material area mother board 42 and a plurality of cleaning areas 2, and is different in that in this embodiment, the same sides of all the cleaning areas 2 are provided with thinning areas 3, and the size of the thinning areas 3 along the width direction of the pole piece is greater than the scalar sum of positive and negative tolerances of the cutting tools, so that the cutting position of the cutting tools is always within the range of the thinning areas 3, the thinning areas 3 can be cut along the length direction of the pole piece to form a first thinning area 31 and a second thinning area 32 of an adjacent pole piece, as shown in fig. 9, when the cutting tools cut the pole piece mother board 4, the cutting lines 5 always fall within the range of the thinning areas 3, and then form pole pieces with the first thinning areas 31 and the second thinning areas 32, and the first thinning areas 31 can cooperate with the corresponding cleaning areas 2 to ensure the welding quality of the pole ears 6. The pole piece mother board in this embodiment, like the pole piece in embodiment 1, can be made without considering the shapes of the thinning area 3 and the cleaning area 2, but is preferably rectangular in cross section. By adopting the pole piece mother board, the pole pieces in the embodiment 1 can be rapidly and batched cut, punching gaps are not needed, and the yield of the pole pieces is higher.
The excessive size of the thinning area 3 along the width direction of the pole piece can affect the active material capacity of the pole piece, and as a better choice, the size of the thinning area 3 along the width direction of the pole piece is smaller than or equal to the scalar sum of positive and negative tolerances of a cutting tool and 2mm. When the dimension of the thinning area 3 along the width direction of the pole piece is smaller than or equal to the scalar sum of the positive tolerance and the negative tolerance of the cutting tool and is added by 2mm, if the positive tolerance and the negative tolerance of the cutting tool are respectively +1mm and-1 mm, the dimension of the thinning area 3 along the width direction of the pole piece is 4mm, the influence on the active material capacity of the pole piece can be reduced, and the pole piece mother board 4 is convenient to cut synchronously to form the pole piece.
Example 3
A method for processing a pole piece, for processing the pole piece described in embodiment 1, wherein the cleaning region 2 of the pole piece is provided with a second thinning region 32 along the other side of the width direction of the pole piece;
the processing method of the pole piece comprises the following steps:
s1, processing a pole piece mother board as in the embodiment 2;
s2, cutting along the length direction of the pole piece through the thinning area 3 to form a first thinning area 31 and a second thinning area 32 of the adjacent pole piece, and finishing pole piece processing.
By adopting the processing method of the pole piece, the pole piece in the embodiment 1 can be rapidly produced in batches, a notch is not required to be punched, and the yield of the pole piece is higher.
In step S1, the cleaning area 2 of the pole piece mother board and the corresponding thinning area 3 can be cleaned synchronously, so that the cleaning area 2 and the corresponding thinning area 3 are more convenient to process, and the cleaning steps are reduced. The cleaning area 2 and the corresponding thinning area 3 for synchronously cleaning the pole piece mother board can adopt the following steps: the cleaning area 2 is divided into at least two times of cleaning along the thickness direction of the pole piece, and each time of cleaning is performed along the width direction of the pole piece, wherein at least one time of cleaning covers the plane range of the thinning area 3.
In the above manner, that is, the active material to be cleaned in the cleaning region 2 is subjected to the layered cleaning in the thickness direction, and then the process of at least one cleaning is extended and covered to the plane range of the thinning region 3, so that the thinning region 3 is cleaned less frequently than the cleaning region 2, and when the active material layer of the cleaning region 2 is cleaned and the current collector mother plate 41 is exposed, the thinning region 3 also remains with at least one non-cleaned active material layer. Such as: when the active substances required to be cleaned in the cleaning area 2 are divided into two times of cleaning in the thickness direction, the first time of cleaning passes through the range of the laser cleaning area 2 and the range of the corresponding thinning area 3, and the thickness of the thinning area 3 after the first time of cleaning can be controlled to reach the standard, and the second time of cleaning only the range of the cleaning area 2 can ensure that the cleaning area 2 and the corresponding thinning area 3 are synchronously cleaned, and the corresponding thinning area 3 is not required to be cleaned after the cleaning area 2 is cleaned. The cleaning area 2 and the corresponding thinning area 3 of the pole piece mother board are synchronously cleaned in the mode, so that the construction process can be reduced, and the cleaning tool is prevented from being adjusted for multiple times or added.
Example 4
The embodiment provides a battery, which comprises a shell, a cap and a battery cell;
the battery cell comprises a negative electrode plate, a diaphragm and a positive electrode plate, wherein the positive electrode plate and/or the negative electrode plate adopts the electrode plate in the embodiment 1, and the negative electrode plate, the diaphragm and the positive electrode plate are stacked and wound into a winding body;
the shell is provided with a mounting groove, the battery cell is arranged in the mounting groove, and the cap is plugged in the notch of the mounting groove.
By adopting the battery, the positive electrode plate and/or the negative electrode plate of the battery core adopt the electrode plate in the embodiment 1, the positive electrode plate and the negative electrode plate can be adopted or both are adopted, and the notch part in the prior art is replaced by arranging the first thinning area 31, so that the electrode plate does not need to be punched with a notch, the current collector 11 at the first thinning area 31 is reserved, the mechanical strength of the electrode plate is higher, and the breakage risk of the electrode plate during winding can be reduced. Besides, because the first thinning region 31 is also provided with the active substance which is the same as that of the material region 12, compared with the pole piece active substance in the prior art, the volume of the battery can be increased, and the active substance exists in the first thinning region 31, no gummed paper is needed in the subsequent process, and the working procedures are fewer. And need not die-cut breach, the yields of pole piece is higher.
The positive electrode plate and/or the negative electrode plate of the battery core adopt the electrode plate in the embodiment 1, the mechanical strength of the positive electrode plate and/or the negative electrode plate is higher, the belt breakage risk during the winding of the electrode plate can be reduced, the first thinning region 31 is also provided with active substances the same as the material region 12, the active substances of the positive electrode plate and/or the negative electrode plate are more, the capacity of the battery is higher, the quality is better, the thickness of the battery core is not increased, and the volume of the battery can be kept in a normal state.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a pole piece, its characterized in that includes current collector (11), current collector (11) thickness direction's both sides all include material district (12), washing district (2) and first attenuate district (31), washing district (2) are used for welding the welding end of utmost point ear (6), washing district (2) are equipped with along one side of the width direction of pole piece first attenuate district (31), first attenuate district (31) with correspond washing district (2) adjacent setting and extend to the corresponding side edge of pole piece, first attenuate district (31) with material district (12) have the same active material, the thickness of first attenuate district (31) is less than or equal to thickness and homonymy of material district (12) the thickness of utmost point ear (6) is different.
2. Pole piece according to claim 1, characterized in that the thickness of the first thinned region (31) is greater than or equal to the particle size of the active substance.
3. Pole piece according to claim 2, characterized in that the thickness of the first thinned region (31) is the difference between the thickness of the material region (12) and the thickness of the tab (6) on the same side when the difference between the thickness of the material region (12) and the thickness of the tab (6) on the same side is greater than or equal to the particle size of the active substance.
4. A pole piece according to any of claims 1-3, characterized in that the washing zone (2) and the first thinning zone (31) are rectangular in cross-section.
5. A pole piece motherboard, characterized in that the pole piece motherboard is used for cutting and forming a plurality of pole pieces according to any one of claims 1-4, and the other side of the cleaning area (2) of the pole piece along the width direction of the pole piece is provided with a second thinning area (32);
the pole piece mother board comprises a current collector mother board (41), two sides of the current collector mother board (41) in the thickness direction all comprise a material area mother board (42), a plurality of cleaning areas (2) and thinning areas (3) corresponding to the cleaning areas (2), all the thinning areas (3) are respectively arranged on the same sides of the cleaning areas (2) along the width direction of the pole piece, the thinning areas (3) are adjacently arranged corresponding to the cleaning areas (2), all the cleaning areas (2) are arranged at intervals along the width direction of the pole piece mother board, the size of the thinning areas (3) along the width direction of the pole piece is larger than the scalar sum of positive and negative tolerances of a cutting tool, and the thinning areas (3) can be cut along the length direction of the pole piece to form a first thinning area (31) and a second thinning area (32) of an adjacent pole piece.
6. Pole piece motherboard according to claim 5, characterized in that the dimension of the thinning area (3) in the pole piece width direction is smaller than or equal to the scalar sum of the positive and negative tolerances of the cutting tool plus 2mm.
7. A method of machining a pole piece, characterized in that it is used for machining a pole piece according to any one of claims 1-4, said washing zone (2) of said pole piece having a second thinning zone (32) on the other side in the width direction of the pole piece;
the processing method of the pole piece comprises the following steps:
s1, processing the pole piece mother board according to any one of claims 5-6;
s2, penetrating the thinning area (3) along the length direction of the pole piece to form a first thinning area (31) and a second thinning area (32) of the adjacent pole piece, and finishing pole piece processing.
8. The method according to claim 7, characterized in that in step S1, the washing zone (2) of the pole piece mother plate and the corresponding thinning zone (3) are washed out simultaneously.
9. A method of machining a pole piece according to claim 8, characterized in that the simultaneous cleaning of the cleaning zone (2) and the corresponding thinning zone (3) of the pole piece master plate comprises the steps of:
the cleaning area (2) is divided into at least two times of cleaning along the thickness direction of the pole piece, each time of cleaning is carried out along the width direction of the pole piece, and at least one time of cleaning covers the plane range of the thinning area (3).
10. A battery is characterized by comprising a shell, a cap and a battery cell;
the battery cell comprises a negative electrode plate, a diaphragm and a positive electrode plate, wherein the positive electrode plate and/or the negative electrode plate adopt the electrode plate according to any one of claims 1-4, and the negative electrode plate, the diaphragm and the positive electrode plate are stacked and wound into a winding body;
the shell is provided with a mounting groove, the battery cell is arranged in the mounting groove, and the cap is plugged in the notch of the mounting groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211741155.1A CN116053403A (en) | 2022-12-30 | 2022-12-30 | Pole piece, pole piece mother board, processing method of pole piece and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211741155.1A CN116053403A (en) | 2022-12-30 | 2022-12-30 | Pole piece, pole piece mother board, processing method of pole piece and battery |
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| Publication Number | Publication Date |
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| CN116053403A true CN116053403A (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211741155.1A Pending CN116053403A (en) | 2022-12-30 | 2022-12-30 | Pole piece, pole piece mother board, processing method of pole piece and battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116565130A (en) * | 2023-07-10 | 2023-08-08 | 宁德新能源科技有限公司 | Pole piece assembly, electrode assembly, electrochemical device and electric equipment |
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2022
- 2022-12-30 CN CN202211741155.1A patent/CN116053403A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116565130A (en) * | 2023-07-10 | 2023-08-08 | 宁德新能源科技有限公司 | Pole piece assembly, electrode assembly, electrochemical device and electric equipment |
| CN116565130B (en) * | 2023-07-10 | 2024-05-14 | 宁德新能源科技有限公司 | Pole piece assembly, electrode assembly, electrochemical device and electric equipment |
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