CN109962244B - Current collector, battery core and battery - Google Patents
Current collector, battery core and battery Download PDFInfo
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- CN109962244B CN109962244B CN201711418135.XA CN201711418135A CN109962244B CN 109962244 B CN109962244 B CN 109962244B CN 201711418135 A CN201711418135 A CN 201711418135A CN 109962244 B CN109962244 B CN 109962244B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/76—Containers for holding the active material, e.g. tubes, capsules
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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
Abstract
The invention provides a current collector, an electric core and a battery, wherein an etching pattern formed by a non-through nick groove is arranged on the surface of the current collector, the etching pattern is composed of a plurality of continuous or discontinuous closed curves, and the closed curves are closed curves formed by straight lines, closed curves formed by curves or closed curves formed by combination of the straight lines and the curves. The current collector can effectively improve the safety of the battery when the battery is punctured by a hard object, and meanwhile, the normal use of the battery cannot be influenced.
Description
Technical Field
The invention relates to the field of batteries, in particular to a current collector, a battery core and a battery.
Background
In the process of the gradual popularization of the electric automobile, the energy density of the battery becomes a future development hotspot. The service life of the battery can be greatly prolonged by increasing the energy density, the endurance mileage of the electric automobile is increased, the safety of the battery is reduced, and the safety risk of the electric automobile is increased. Particularly, when the battery is pierced by a hard object or the like, the electric vehicle has a great potential safety hazard, and therefore, an effective means is required to improve the safety of the battery.
The wide use of the ceramic coating on the surface of the isolating membrane improves the safety of the battery to a certain extent, reduces the risk of short circuit of the cathode and the anode caused by abuse in the using process, but has the defects that the cost of the battery is greatly improved, and the electrochemical performance of the battery is also deteriorated to a certain extent by the ceramic coating on the surface of the isolating membrane. In addition, the improvement effect of the ceramic coating on the safety of the battery is limited, and especially the safety of the battery when the battery is punctured by a hard object is still not effectively solved.
Disclosure of Invention
In view of the problems in the background art, the present invention is directed to a current collector, a battery cell, and a battery, which can effectively improve the safety of the battery when the battery is punctured by a hard object, and at the same time, the normal use of the battery is not affected.
In order to achieve the above object, in one aspect of the present invention, an etching pattern formed by non-through score grooves is disposed on a surface of a current collector, and the etching pattern is composed of a plurality of continuous or discontinuous closed curves, and the closed curves are closed curves formed by straight lines, closed curves formed by curves, or closed curves formed by a combination of straight lines and curves.
In another aspect of the invention, the invention provides a battery cell, which includes a cathode plate, an anode plate and a separator. Wherein the cathode plate uses the current collector according to one aspect of the invention; or the anode piece using a current collector according to an aspect of the invention; or said cathode sheet uses a current collector according to an aspect of the invention and said anode sheet also uses a current collector according to an aspect of the invention.
In yet another aspect of the present invention, the present invention provides a battery comprising a cathode sheet, an anode sheet, a separator, an electrolyte, and a packaging case. Wherein the cathode plate uses the current collector according to one aspect of the invention; or the anode piece using a current collector according to an aspect of the invention; or said cathode sheet uses a current collector according to an aspect of the invention and said anode sheet also uses a current collector according to an aspect of the invention.
Compared with the prior art, the invention at least comprises the following beneficial effects:
in the current collector, the current collector is etched in advance, an etched pattern formed by a pattern surrounded by a plurality of continuous or discontinuous closed curves is formed on the surface of the current collector, active substance slurry can be normally coated on the surface of the etched current collector, and a pole piece can be manufactured through working procedures of cold pressing and the like, so that the normal use of a battery is not influenced, and the electrochemical performance of the battery is not influenced.
In the current collector, when the battery is pierced by a hard object such as a piercing nail, the stress of the partial current collector in the piercing area is larger than that of the current collector in other areas, and the thickness of the notch groove of the etched pattern is thinner, so that the partial current collector in the piercing area is easy to fall off from the current collector main body, the other parts on the current collector main body are prevented from being in contact short circuit with the counter electrode, only the falling area and the counter electrode form a short circuit point, the short circuit area of a cathode and an anode is greatly reduced, the heat generation quantity of a short circuit loop is reduced, the heat accumulation is effectively controlled, and the safety of the battery can be greatly improved, particularly the safety of the battery when the battery is pierced by the hard object.
Drawings
Fig. 1 to 9 show various shapes of a figure surrounded by closed curves according to the present invention.
Fig. 10 is a schematic view of a laser etched current collector in embodiment 1 of the present invention.
Fig. 11 is a schematic view of a laser-etched current collector in embodiment 2 of the present invention.
Fig. 12 is a schematic view of a laser etched current collector in embodiment 3 of the present invention.
Detailed Description
The current collector, the battery cell and the battery according to the present invention will be described in detail below.
First, a current collector according to a first aspect of the present invention is described, wherein an etching pattern formed by a plurality of continuous or discontinuous closed curves is provided on a surface of the current collector. The closed curve is formed by straight lines, curved lines or a combination of the straight lines and the curved lines.
From the mechanism of the existing nail penetration test, the key point for improving the battery safety lies in how to control the heat accumulation of the nail penetration short-circuit point, the heat accumulation of the short-circuit point is caused by the short circuit of the cathode and the anode, and the short circuit of the cathode and the anode at the nail penetration moment can cause a large amount of heat accumulation to cause thermal failure. In the current collector of the first aspect of the invention, the current collector is etched in advance, an etched pattern formed by a pattern surrounded by a plurality of continuous or discontinuous closed curves is formed on the surface of the current collector, and the surface of the etched current collector can be normally coated with active substance slurry and made into a pole piece through working procedures of cold pressing and the like, so that the normal use of a battery is not influenced, and the electrochemical performance of the battery is not influenced; meanwhile, when the battery is pierced by hard objects such as piercing pins, the stress of a part of the current collector in the piercing area is larger than that of the current collector in other areas, and the thickness of the notch groove of the etching pattern is thinner, so that the part of the current collector in the piercing area is easy to fall off from the current collector main body, namely, a graph formed by one or a plurality of closed curves directly falls off from the current collector main body, the other parts on the current collector main body are prevented from being in contact short circuit with a counter electrode, only the falling area and the counter electrode form a short circuit point, the short circuit area of a cathode and an anode is greatly reduced, the heat generation quantity of a short circuit loop is reduced, the heat accumulation is effectively controlled, the safety of the battery can be greatly improved, and particularly the safety of the battery when the battery is pierced by the hard objects is improved.
In the current collector of the first aspect of the present invention, the method of etching is not limited, and preferably, the etching pattern may be formed by laser etching. Preferably, the laser walking speed is 30-500 mm/s, the laser frequency is 20-500 Hz, and the laser duty ratio is 5-95%.
In the current collector of the first aspect of the present invention, the pattern defined by the closed curves includes a regular pattern or an irregular pattern. Preferably, the figure enclosed by the closed curve can be selected from one or more of a circle (figure 1), an ellipse (figure 2), a polygon (figures 3 to 6), a polygon circumscribed circle (figures 7 and 8), a polygon inscribed circle (figure 9) and a sector. Preferably, the number of sides of the polygon can be 3-40, and the sides of the polygon can be equal or unequal, preferably equal (i.e. regular polygon). From the viewpoint of practical convenience, the closed curve may preferably form a circle, a regular triangle, or a square.
In the current collector of the first aspect of the present invention, a linear length of a straight line segment in the closed curve is 0.5mm to 5mm, and a curvature radius of a curved line segment in the closed curve is 0.25mm to 2.5 mm. Correspondingly, when the graph enclosed by the closed curves is a circle, the diameter of the circle is 0.5 mm-5 mm; when the figure enclosed by the closed curve is an ellipse, the major axis and the minor axis of the ellipse are both between 0.5mm and 5mm, and the length of the minor axis is less than that of the major axis; when the figure enclosed by the closed curve is a polygon, the side length of each polygon is 0.5 mm-5 mm; when the figure enclosed by the closed curve is a polygon circumcircle and a polygon inscribed circle, the diameter of the circle can be 0.5 mm-5 mm, and the side length of the polygon can be 0.5 mm-5 mm; when the figure enclosed by the closed curve is a sector, the radius of the sector is 0.25 mm-2.5 mm.
In the current collector of the first aspect of the present invention, the area of the pattern enclosed by each closed curve is 1mm2～15mm2。
In the current collector of the first aspect of the present invention, preferably, the depth of the score groove is 1/4 to 2/3, preferably 1/2 to 2/3, of the thickness of the current collector.
In the current collector of the first aspect of the present invention, preferably, the thickness of the current collector may be 5 μm to 20 μm.
In the current collector of the first aspect of the present invention, preferably, a width of the score groove is 0.5 to 5 times a depth of the score groove.
In the current collector of the first aspect of the present invention, preferably, when the etching pattern is composed of a plurality of discontinuous patterns surrounded by closed curves, a distance between the patterns surrounded by two adjacent closed curves is 0.5mm to 3 mm.
In the current collector of the first aspect of the present invention, preferably, the current collector is an aluminum foil or a copper foil.
Next, a battery cell according to a second aspect of the present invention is described, which includes a cathode sheet, an anode sheet, and a separator. Wherein the cathode plate uses the current collector according to the first aspect of the invention; or the anode sheet uses the current collector according to the first aspect of the invention; or said cathode sheet uses a current collector according to the first aspect of the invention and said anode sheet also uses a current collector according to the first aspect of the invention. The isolating membrane is used for separating the cathode pole piece and the anode pole piece, and the material of the isolating membrane can be a film made of one or more materials of polyethylene, polypropylene, non-woven fabric and poly fiber material.
A battery according to a third aspect of the invention is explained again, which comprises a cathode sheet, an anode sheet, a separator, an electrolyte, and a packaging case. Wherein the cathode plate uses the current collector according to the first aspect of the invention; or the anode sheet uses the current collector according to the first aspect of the invention; or said cathode sheet uses a current collector according to the first aspect of the invention and said anode sheet also uses a current collector according to the first aspect of the invention.
The type of the battery according to the third aspect of the present invention is not limited, and may be a lithium ion battery, a lithium metal battery, a sodium ion battery, a zinc ion battery, a magnesium ion battery, or the like.
Taking a lithium ion battery as an example:
the cathode pole piece comprises a cathode current collector and a cathode diaphragm which is arranged on the surface of the cathode current collector and contains cathode active substances, wherein the cathode active substances can be selected from Li in chemical formulaaM1-xM’xO2The layered lithium transition metal oxide has a chemical formula of LiFeyMn1-y-zM”zPO4Wherein a is more than or equal to 0.9 and less than or equal to 1.1, x is more than or equal to 0 and less than or equal to 0.1, M is selected from one or more of Co, Mn and Ni, M' is selected from one or more of Al, Mg, B, Zr, Si, Ti, Cr, Fe, V, Cu, Ca, Zn, Nb, Mo, Sr, Sb, W and Bi, and 0<y≤1，0≤z<1, M' is selected from one or more of Cr, Mg, Ti, Al, Zn, W, Nb and Zr.
The anode plate comprises an anode current collector and an anode membrane which is arranged on the surface of the anode current collector and contains an anode active substance, wherein the anode active substance can be selected from materials capable of receiving and releasing lithium ions, such as one or more of soft carbon, hard carbon, artificial graphite, natural graphite, silicon-oxygen compound, silicon-carbon compound, lithium titanate and metal capable of forming an alloy with lithium.
The electrolyte includes an organic solvent and a lithium salt, and the specific kinds of the organic solvent and the lithium salt are not particularly limited and may be selected according to actual requirements. Preferably, the organic solvent is selected from carbonate solvents and carboxylate solvents with electronic insulation and ionic conduction, for example, the organic solvent is selected from one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethyl formate, ethyl acetate and propyl acetate. Preferably, the lithium salt may be selected from LiPF6、LiBF4、LiBOB、LiAsF6、Li(CF3SO2)2N、LiCF3SO3、LiClO4One or more of them.
The present application is further illustrated below with reference to examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
Example 1
(1) Preparation of current collectors
Referring to fig. 10, an aluminum foil with a thickness of 13 μm is etched in advance by using laser, the laser speed is controlled to be 100mm/s, the laser frequency is controlled to be 300Hz, the laser duty ratio is controlled to be 65%, a laser etching pattern is composed of a plurality of continuous or discontinuous circles, the diameter of each circle is 3mm, the depth of each nicking groove is 6 μm, the width of each nicking groove is 10 μm, dust is carefully controlled in the processing process, after the laser etching is finished, the surface of a current collector is cleaned, metal dust on the surface is removed, and then active material slurry can be coated.
(2) Preparation of cathode plate
LiNi as a cathode active material1/3Co1/3Mn1/3O2The conductive agent Super-P and the adhesive polyvinylidene fluoride are fully stirred and mixed for 60min to 150min in an N-methyl pyrrolidone solvent system according to the weight ratio of 94:3:3, and the stirring linear speed is controlled to be 4m/min to 10 m/min. After being uniformly mixed, the cathode active material slurry is coated on the aluminum foil after the laser etching treatmentAnd drying, cold pressing, splitting and cutting the surface of the current collector to obtain the cathode pole piece.
(3) Preparation of anode plate
The anode plate is prepared by the steps of fully stirring and uniformly mixing anode active substance artificial graphite, a conductive agent Super-P, a binder styrene butadiene rubber and a thickening agent carboxymethylcellulose sodium in a deionized water solvent system according to the weight ratio of 96:1:2:1, coating the mixture on the surface of a copper foil current collector with the thickness of 8 mu m, and drying, cold pressing, splitting and cutting the mixture.
(4) Preparation of the separator
A PE/PP/PE three-layer porous polymer film is used as a separation film.
(5) Preparation of the Battery
And winding the cathode pole piece, the isolating film and the anode pole piece in sequence, wherein the winding control isolating film is positioned in the middle of the cathode pole piece and the anode pole piece to play a role in isolation, the winding control dislocation between the cathode pole piece and the anode pole piece and the isolating film is realized, and the battery cell is obtained after winding. And welding the qualified battery core on the top cover through the lug, completing the shell entering and baking, and then performing the processes of liquid injection, formation and the like to obtain the battery.
Example 2
A battery was prepared according to the method of example 1, except that:
(1) preparation of current collectors
Referring to fig. 11, an aluminum foil with a thickness of 13 μm is etched in advance by using laser, the laser speed is controlled to be 100mm/s, the laser frequency is controlled to be 300Hz, the laser duty ratio is controlled to be 65%, a laser etching pattern is composed of a plurality of continuous squares, the side length of each square is 3mm, the depth of each indented groove is 6 μm, the width of each indented groove is 10 μm, dust is carefully controlled in the processing process, after the laser etching is finished, the surface of a current collector is cleaned, metal dust on the surface is removed, and then active material slurry can be coated.
Example 3
A battery was prepared according to the method of example 1, except that:
(1) preparation of current collectors
Referring to fig. 12, an aluminum foil with a thickness of 13 μm is etched in advance by using laser, the laser speed is controlled to be 100mm/s, the laser frequency is controlled to be 300Hz, the laser duty ratio is controlled to be 65%, a laser etching pattern is composed of a plurality of continuous square circumscribed circles, the diameter of each circle is 3mm, the side length of each square is 2.121mm, the depth of each nicking groove is 6 μm, the width of each nicking groove is 10 μm, dust is carefully controlled in the processing process, after the laser etching is finished, the surface of a current collector is cleaned, metal dust on the surface is removed, and then active substance slurry can be coated.
Comparative example 1
A battery was prepared according to the method of example 1, except that: the aluminum foil current collector is not subjected to laser etching treatment, and cathode active substance slurry is directly coated on the surface of the aluminum foil current collector.
Next, the test of the cell will be described, and 20 cells in each of examples and comparative examples were tested under the same conditions.
(1) Nail penetration performance test of battery
At normal temperature, the battery is charged to 4.2V at a constant current of 0.5C (namely, the current value of which the theoretical capacity is completely discharged within 2 h), then is charged to 0.05C at a constant voltage, and is discharged to 3.0V at a constant current of 0.5C; the cells were left to stand for 24h, charged to 4.2V at a constant current of 0.5C, then charged to 0.05C at a constant voltage, and then the 100% SOC cells were subjected to a nail penetration test. The nail penetration speed is controlled to be 80mm/s, the nail penetration direction is vertical to the surface of the battery pole piece, and the nail penetration diameter is 6 mm.
Table 1 shows the results of the nail penetration performance tests of examples 1 to 3 and comparative example 1, in table 1, the failure level HL5 indicates that a larger spark occurs at the battery explosion-proof valve first and then the spark burns, the failure level HL4 indicates that the spark occurs at the battery explosion-proof valve but the spark does not burn, and the failure level HL3 indicates that no significant spark occurs at the battery explosion-proof valve and the battery has no liquid leakage.
TABLE 1 nailing Performance test results of examples 1-3 and comparative example 1
As can be seen in table 1, the nail penetration performance of the batteries of examples 1 to 3 was greatly improved compared to that of comparative example 1.
In comparative example 1, the aluminum foil current collector was not treated, the battery was substantially difficult to pass through during nail penetration, all had flaming combustion, and all had a failure rating of HL 5.
In example 1, a plurality of continuous or discontinuous circles are etched on the surface of the aluminum foil current collector through laser, the nail penetration performance of the battery is improved, but some batteries have sparks during nail penetration, but the ignition and combustion do not occur.
Example 2 a plurality of continuous squares were laser etched on the surface of the aluminum foil current collector, and the nail penetration performance of the battery was improved, but to a lesser extent.
In the embodiment 3, the plurality of continuous square circumscribed circles are etched on the surface of the aluminum foil current collector through laser, the battery has good nail penetration performance and can basically and completely pass through, the failure grade is HL3, no obvious sparks appear, the highest temperature on the surface of the battery is not more than 90 ℃, and the improvement effect on the nail penetration performance of the battery is most obvious.
(2) Electrochemical performance testing of batteries
And (3) gram capacity test: and after winding to obtain a battery cell, putting the battery cell into a shell, baking, injecting liquid, charging to 3.85V at a constant current of 0.2C, then charging to 4.2V at a constant current of 0.5C, then charging to 0.05C at a constant voltage, then discharging to 3.0V at a constant current of 0.5C, recording the capacity of the battery in the discharging process, and calculating to obtain the actual gram discharge capacity of the battery by taking the capacity as a numerator and the mass of the cathode active material as a denominator.
And (3) impedance testing: after the gram capacity test, the battery was charged to 3.85V at a constant current of 0.5C and then to 0.05C at a constant voltage, and the impedance of the battery was measured using a resistance tester with a frequency set at about 100 Hz.
TABLE 2 results of electrochemical Performance test of examples 1-3 and comparative example 1
As can be seen from table 2, the actual discharge gram capacities and impedances of examples 1 to 3 were not significantly changed compared to comparative example 1, indicating that etching an etching pattern consisting of a pattern surrounded by a plurality of continuous or discontinuous closed curves on the surface of the current collector did not affect the electrochemical performance of the battery and the normal use of the battery.
Claims (11)
1. A current collector is characterized in that an etching pattern formed by a non-through nick groove is arranged on the surface of the current collector, the etching pattern is composed of a plurality of continuous or discontinuous closed curves, and the closed curves are closed curves formed by straight lines, closed curves formed by curves, or closed curves formed by combination of straight lines and curves;
the figure enclosed by the closed curve comprises a square circumscribed circle.
2. The current collector of claim 1, wherein the etched pattern is formed by laser etching.
3. The current collector of claim 1, wherein the closed curve defines a pattern further selected from one or more of a circle, an ellipse, a polygon, a polygonal inscribed circle and a sector.
4. The current collector of claim 1, wherein the area of the pattern defined by each closed curve is 1mm2～15mm2。
5. The current collector of claim 1, wherein the depth of the score groove is 1/4-2/3 of the thickness of the current collector.
6. The current collector of claim 5, wherein the depth of the score groove is 1/2-2/3 of the thickness of the current collector.
7. The current collector of claim 1, wherein the current collector has a thickness of 5 μ ι η to 20 μ ι η.
8. The current collector of claim 1, wherein the width of the score groove is 0.5 to 5 times the depth of the score groove.
9. The current collector of claim 1, wherein when the etching pattern is formed by a plurality of discontinuous closed curves, the distance between the patterns formed by two adjacent closed curves is 0.5mm to 3 mm.
10. A battery cell comprises a cathode pole piece, an anode pole piece and a separation film, and is characterized in that,
the cathode pole piece using the current collector according to any one of claims 1 to 9; or
The anode sheet uses the current collector according to any one of claims 1 to 9; or
The cathode sheet uses the current collector according to any of claims 1-9 and the anode sheet uses the current collector according to any of claims 1-8.
11. A battery comprises a cathode pole piece, an anode pole piece, a separation film, electrolyte and a packaging shell, and is characterized in that,
the cathode pole piece using the current collector according to any one of claims 1 to 9; or
The anode sheet uses the current collector according to any one of claims 1 to 9; or
The cathode sheet uses the current collector according to any one of claims 1 to 9 and the anode sheet uses the current collector according to any one of claims 1 to 9.
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| CN201711418135.XA CN109962244B (en) | 2017-12-25 | 2017-12-25 | Current collector, battery core and battery |
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| CN201711418135.XA CN109962244B (en) | 2017-12-25 | 2017-12-25 | Current collector, battery core and battery |
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| CN206250289U (en) * | 2016-11-30 | 2017-06-13 | 宁德时代新能源科技股份有限公司 | Collector, pole piece and secondary cell |
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