CN114447282A - Pole piece, processing method thereof and lithium battery - Google Patents

Pole piece, processing method thereof and lithium battery Download PDF

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Publication number
CN114447282A
CN114447282A CN202011193013.7A CN202011193013A CN114447282A CN 114447282 A CN114447282 A CN 114447282A CN 202011193013 A CN202011193013 A CN 202011193013A CN 114447282 A CN114447282 A CN 114447282A
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CN
China
Prior art keywords
pole piece
active layer
tab
edge
current collector
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Pending
Application number
CN202011193013.7A
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Chinese (zh)
Inventor
刘云龙
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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Application filed by Beijing Xiaomi Mobile Software Co Ltd filed Critical Beijing Xiaomi Mobile Software Co Ltd
Priority to CN202011193013.7A priority Critical patent/CN114447282A/en
Publication of CN114447282A publication Critical patent/CN114447282A/en
Pending legal-status Critical Current

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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
    • H01M4/139—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
    • 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
    • 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

Abstract

The disclosure relates to the technical field of lithium batteries, and particularly provides a pole piece, a processing method of the pole piece and a lithium battery. The pole piece processing method comprises the following steps: forming an active layer on a current collector; removing a portion of the active material along a first edge of the active layer; the first edge is an edge close to the side where the lug on the current collector is located in a preset position; processing the current collector to form at least one tab in the tab preset position; and forming an insulating layer at the position of the at least one tab close to the active layer to obtain the pole piece. The pole piece processed by the method disclosed by the invention eliminates the sudden increase of the edge thickness of the active layer, ensures the smoothness of the pole piece, improves the performance and prolongs the service life of the battery.

Description

Pole piece, processing method thereof and lithium battery
Technical Field
The disclosure relates to the technical field of lithium batteries, in particular to a pole piece, a processing method thereof and a lithium battery.
Background
The lithium ion battery is used as an energy storage device capable of being charged and discharged circularly, and is widely applied to the fields of electronic products, new energy automobiles and the like at present. In the cell structure of the lithium ion battery, in order to improve the cell safety, in the related art, when the pole pieces are processed, an insulating coating is often required to be coated on the edge of an active material layer of the positive pole piece, so that the insulativity between the positive pole piece and the negative pole piece, particularly the positions of the pole lugs, is better, and the short circuit risk is reduced. However, in the related art, the flatness of the cell pole piece is poor, the problem of poor edge interface in the cyclic charge and discharge process occurs, the cell performance is damaged, and even a short circuit risk is caused.
Disclosure of Invention
In order to solve the technical problem of poor smoothness of a pole piece of a battery cell in the related art, the embodiment of the disclosure provides a pole piece, a processing method of the pole piece and a lithium battery.
In a first aspect, an embodiment of the present disclosure provides a pole piece processing method, including:
forming an active layer on a current collector;
removing a portion of the active material along a first edge of the active layer; the first edge is an edge close to the side where the lug on the current collector is located in a preset position;
processing the current collector to form at least one tab in the tab preset position;
and forming an insulating layer at the position of the at least one tab close to the active layer to obtain the pole piece.
In some embodiments, the removing a portion of the active material along a first edge of the active layer comprises:
removing the active material of a first preset width along the first edge of the active layer; the first preset width is 0.5 mm-7 mm.
In some embodiments, the removing a portion of the active material along a first edge of the active layer comprises:
cutting out the active material along the first edge of the active layer by laser cutting or mechanical cutting.
In some embodiments, the forming of the insulating layer at the position of the at least one tab near the active layer includes:
forming an insulating layer with a second preset width at the position of the at least one tab close to the active layer; the second preset width is 1 mm-3 mm.
In some embodiments, the forming of the insulating layer at the position of the at least one tab near the active layer includes:
coating an insulating material at the position of the tab close to the active layer to form the insulating layer; or
And adhering insulating gummed paper at the position of the lug close to the active layer to form the insulating layer.
In some embodiments, the insulating layer has a cover area partially covering the active layer, and the cover area has a width of 0mm to 0.8 mm.
In some embodiments, said treating said current collector to form at least one tab in said tab pre-set position comprises:
and cutting the current collector to form the at least one tab in the tab preset position.
In some embodiments, the forming an active layer on the current collector comprises:
and coating an active substance on the current collector, and drying and rolling the active substance to obtain the active layer.
In a second aspect, an embodiment of the present disclosure provides a pole piece, which is processed by the method described in any one of the embodiments of the first aspect.
In a third aspect, an embodiment of the present disclosure provides a lithium battery, including the pole piece described in any embodiment of the second aspect.
The pole piece processing method comprises the steps of forming an active layer on a current collector, removing partial active substances along a first edge of the active layer, processing the current collector to form at least one lug in a preset position of the lug, and forming an insulating layer at the position, close to the active layer, of the at least one lug to obtain a pole piece. According to the method, before the insulating layer is formed, the active substances on the edge are removed along the edge of the active layer, the problem of thick edge of the active layer is solved, the smoothness of the pole piece is guaranteed, then the insulating layer is formed at the position where the pole lug is close to the active layer, on the basis of guaranteeing good insulativity of the pole piece, the thickness increase of the pole piece edge caused by the covering thickness of the insulating layer and the active layer is reduced, and the performance of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1a to 1c are schematic views of a processing process of a pole piece processing method in the related art.
Fig. 2 is a flow chart of a pole piece processing method according to some embodiments of the present disclosure.
Fig. 3a to 3e are schematic views illustrating a process of a pole piece processing method according to an embodiment of the present disclosure.
FIG. 4 is an enlarged partial view of the location of the insulation layer of a pole piece according to another embodiment of the present disclosure.
Detailed Description
The technical solutions of the present disclosure will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. In addition, technical features involved in different embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.
The pole piece and the processing method thereof provided by the embodiment of the disclosure are suitable for lithium batteries which generally comprise a positive pole piece, a negative pole piece, a diaphragm, organic electrolyte and the like. The lithium battery can be generally divided into a winding type and a laminated type according to different battery cell structures, and the scheme of the embodiment of the disclosure is suitable for both the winding type pole piece and the laminated type pole piece.
The pole piece comprises a current collector and an active layer coated on the current collector, wherein the active layer can be positiveThe negative electrode is selected from different active materials, for example, the positive electrode active material can be lithium cobaltate LiCoO2Lithium manganate LiMn2O4, lithium iron phosphate LiFePO4 and the like; the negative active material can be graphite and lithium titanate Li2TiO3And the like.
In order to improve the insulation of the edges of the positive and negative electrode plates and prevent the positive and negative electrodes from short-circuiting, an insulating material with a certain width is often coated on the edges of the positive electrode plates or the negative electrode plates to form an insulating layer. In the related art, reference may be made to fig. 1a to 1c for a processing manner of a pole piece having an insulating layer, and fig. 1a to 1c illustrate a processing manner of a multi-tab winding type pole piece in the related art.
As shown in fig. 1a, an active material, typically a liquid slurry, is first coated on a current collector 10 to form an active layer 20, and the active layer 20 is formed after the active material is dried and rolled. As shown in fig. 1b, the insulating layer 30 having a certain width is formed at the edge of the active layer 20, and the insulating layer may be formed by coating an insulating material having a certain width, for example, alumina, liquid ceramic, etc., on the edge of the active layer 20. As shown in fig. 1c, after the insulating layer 30 is formed, the electrode tab is cut and formed, and the insulating layer 30 having a certain width and an excess current collector are cut, thereby forming a plurality of tabs 40. It can be seen that the insulating layer 30 with a certain width is remained at one end of the tab 40 close to the active layer 20, so that after the pole piece is packaged, the good insulating property of the edges of the positive pole piece and the negative pole piece can be ensured, and the safety of the battery is improved.
However, in the related art, due to the tension problem during drying, the two edges of the active layer 20 are prone to have a "thick edge" problem of a sudden increase in thickness, that is, the coating thickness of the two long edges of the active layer 20 in fig. 1a is greater, which results in uneven pole piece. The sudden increase of the edge coating thickness can cause Cell Balance of the positive electrode and the negative electrode to be reduced, and further causes side reactions such as lithium precipitation and the like to occur at the edge of the pole piece in the circulating charge-discharge process, so that the joint effect of the edge of the pole piece and a diaphragm interface is poor, the local expansion and thickening of the edge of the battery core are caused, and the performance of the battery is reduced.
Based on the defects in the related art, the embodiments of the present disclosure provide a pole piece processing method, and fig. 2 and fig. 3a to 3c illustrate some embodiments of the method of the present disclosure, which are described in detail below with reference to the accompanying drawings.
As shown in fig. 2, in some embodiments, the pole piece processing method of the present disclosure includes:
and S10, forming an active layer on the current collector.
Specifically, the current collector is a pole piece substrate, which generally employs an aluminum foil, and an active layer is formed by coating an active material on the current collector.
The active material can be selected from different liquid slurries according to the positive and negative electrode plates, for example, common positive electrode active materials include lithium cobaltate LiCoO2Lithium manganate LiMn2O4, lithium iron phosphate LiFePO4 and the like; the negative active material comprises graphite and lithium titanate Li2TiO3And the like.
The current collector is formed by coating a liquid active material on the current collector and then performing processes such as drying, rolling and the like.
In one example, as shown in fig. 3a, the electrode sheet is a wound multi-tab positive electrode sheet, and for example, lithium cobaltate LiCoO is coated on the current collector 100 by a coating process2And the positive electrode active material is dried and rolled, thereby forming an active layer 200 on the current collector 100, the active layer 200 having a coating width of L1.
As can be seen from the foregoing, the thickness at both edges of the formed active layer 200 is thicker than at other positions.
S20, removing part of active substances along the first edge of the active layer; the first edge is an edge close to the side where the lug on the current collector is preset.
Specifically, at least one inventive concept of the disclosed method is to: before the insulating layer is coated, the part with the suddenly increased thickness at the edge of the active layer is removed, so that the flatness of the active layer is ensured. Therefore, in this step, the active material of a certain width is removed from both side edges of the active layer.
As shown in fig. 3b, the tab presetting bit 300 refers to a reserved position on the current collector for cutting to form a tab, in this example, the pole piece is a multi-tab pole piece, and therefore, a plurality of tab presetting bits 300 are reserved on two edges of the active layer 200, for convenience of expression, an edge of the active layer 200 close to the tab presetting bit 300 is defined as a first edge, that is, in this example, long edges on upper and lower sides of the active layer 200 are first edges.
As shown in fig. 3c, the active material is removed by a certain width along the upper and lower first edges of the active layer 200 (shown in the dotted line of the edge). In one example, the active material may be cut off by a first preset width along two first edges of the active layer 200 by means of laser cutting or mechanical cutting.
It will be appreciated that the purpose of cutting out the active substance is to eliminate the thickness jump of the edge, so that the person skilled in the art can know the width of the active substance removal according to a particular scenario. For example, in the example of fig. 3c, the first predetermined width of the single-sided excision active substance is from 0.5mm to 7 mm.
Comparing fig. 3b and 3c, the width of the active layer 200 before removal is L1, and the width of the active layer 200 after removal is L2, with L1 being greater than L2. Therefore, through cutting off active substances at the edge of the active layer 200, the edge thickness sudden increase is eliminated, the smoothness of the pole piece is ensured, and the problem of side reaction caused by the edge thickness is avoided.
And S30, processing the current collector to form at least one tab in the tab preset position.
Specifically, as shown in fig. 3d, in the present step, the current collector is cut by laser cutting or mechanical cutting, and the current collector part except for the tab presetting site 300 is cut off, so that the tab presetting site 300 forms a plurality of tab 310 structures.
And S40, forming an insulating layer at the position of at least one tab close to the active layer to obtain the pole piece.
Specifically, as shown in fig. 3e, an insulating layer 400 with a certain width is formed on one end of the tab near the edge of the active layer 200, so as to cover the bottom of the tab 310 in an insulating manner, thereby ensuring the insulation of the tab position of the pole piece.
In one example, an insulation material, such as alumina, liquid ceramic, etc., of a second predetermined width is coated on the tab 310, thereby forming the insulation layer 400.
In another example, a second predetermined width of an insulation paper tape is attached to the tab 310, thereby forming the insulation layer 400.
It should be noted that, because the tab 310 extends out of the diaphragm between the positive and negative electrode plates, the insulating layer 400 is disposed at the tab 310 to ensure the insulation between the positive and negative electrode plates. The skilled person can know the setting width of the insulating layer 400 according to a specific scenario. For example, in the example of fig. 3e, the second predetermined width of insulating layer 400 on pole piece 310 is 1mm to 3 mm.
Therefore, in the embodiment of the disclosure, after the active layer is formed, the active material is removed along the edge of the active layer, so that the abrupt increase of the edge thickness of the active layer is eliminated, the smoothness of the pole piece is ensured, the good pole piece interface is maintained in the process of cyclic charge and discharge of the battery core, the performance is improved, and the service life of the battery is prolonged.
It should be noted that, referring to fig. 1b, in the related art, when the insulating layer 30 is coated, there may be an overlapping region with the edge of the active layer 20, and on the one hand, due to the coverage of the insulating layer 30, the active material in the overlapping region is not available, so that the battery capacity is reduced. On the other hand, the thickness of the edge of the pole piece is further increased due to the coverage of the insulating layer 30, so that the flatness of the pole piece is further deteriorated.
In some embodiments of the present disclosure, the insulating layer 400 may also have a covering region that partially covers the active layer 200. For example, in the example of fig. 4, the width of the coverage area of the insulating layer 400 and the active layer 200 is L3, and L3 is preferably 0mm to 0.8 mm.
It is understood that, in the embodiment of the present disclosure, there may be a partial coverage area between the insulating layer 400 and the active layer 200, or there may be no coverage area, which is not limited thereto. Even in the case of having a cover region, compared with the pole piece in the related art in fig. 1c, the pole piece of the present disclosure still eliminates the defect of abrupt increase of edge thickness caused by the active layer, and also greatly reduces the area of the cover region, and after the pole piece is wound, the thickness of the edge of the pole piece caused by the cover region is greatly reduced.
Therefore, the pole piece processing method eliminates the problem of the edge thickness of the pole piece, enables the pole piece to have good smoothness, improves the performance of the battery, greatly reduces the coverage area of the insulating layer on the active layer, and effectively improves the capacity of the battery.
The above detailed description of the pole piece processing method provided by the present disclosure provides a pole piece, and in the scheme of the present disclosure, the pole piece is obtained by using the processing method in any of the above embodiments.
In the embodiment of fig. 3a to 3e, the pole piece is a multi-tab winding type positive pole piece. In other embodiments, the pole piece is not limited to a positive pole piece, but may be a negative pole piece; the pole piece is not limited to a winding pole piece, and can be a laminated pole piece; the number of tabs of the pole pieces is also not limited and can be any number suitable for implementation. It will be appreciated by those skilled in the art that the present disclosure is not described in detail herein.
On the other hand, the embodiment of the present disclosure further provides a battery cell structure and a lithium battery, which are manufactured by stacking or winding the pole pieces in any of the above embodiments. On the basis of the above disclosure, those skilled in the art can implement the method in combination with the related art without any doubt, and the detailed description of the disclosure is omitted.
Therefore, the pole piece, the battery cell structure and the lithium battery provided by the embodiment of the disclosure have good pole piece smoothness, are favorable for maintaining a good pole piece interface during long-term charge-discharge circulation, and avoid side reactions caused by abrupt increase of the edge thickness of the pole piece, so that the service life of the battery is prolonged, and the battery has higher capacity.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the present disclosure may be made without departing from the scope of the present disclosure.

Claims (10)

1. A pole piece processing method is characterized by comprising the following steps:
forming an active layer on a current collector;
removing a portion of the active material along a first edge of the active layer; the first edge is an edge close to the side where the lug on the current collector is located in a preset position;
processing the current collector to form at least one tab in the tab preset position;
and forming an insulating layer at the position of the at least one tab close to the active layer to obtain the pole piece.
2. The method of claim 1, wherein removing a portion of the active material along the first edge of the active layer comprises:
removing the active material of a first preset width along the first edge of the active layer; the first preset width is 0.5 mm-7 mm.
3. The method of claim 1 or 2, wherein removing a portion of the active material along the first edge of the active layer comprises:
cutting away the active material along the first edge of the active layer by laser cutting or mechanical cutting.
4. The method of claim 1, wherein forming an insulating layer at the location of the at least one tab adjacent to the active layer comprises:
forming an insulating layer with a second preset width at the position of the at least one tab close to the active layer; the second preset width is 1 mm-3 mm.
5. The method as claimed in claim 1 or 4, wherein the forming of the insulation layer at the position of the at least one tab near the active layer comprises:
coating an insulating material at the position of the lug close to the active layer to form the insulating layer; or
And adhering insulating gummed paper at the position of the lug close to the active layer to form the insulating layer.
6. The method of claim 1,
the insulating layer has a cover area partially covering the active layer, and the width of the cover area is 0mm to 0.8 mm.
7. The method of claim 1, wherein the treating the current collector to form at least one tab at the tab preset location comprises:
and cutting the current collector to form the at least one tab in the tab preset position.
8. The method of claim 1, wherein the forming an active layer on the current collector comprises:
and coating an active substance on the current collector, and drying and rolling the active substance to obtain the active layer.
9. A pole piece, wherein the pole piece is processed by the method according to any one of claims 1 to 8.
10. A lithium battery comprising a pole piece according to claim 9.
CN202011193013.7A 2020-10-30 2020-10-30 Pole piece, processing method thereof and lithium battery Pending CN114447282A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2914338Y (en) * 2005-10-18 2007-06-20 比亚迪股份有限公司 Laminated positive plate of lithium ion secondary battery, pole core and battery thereof
CN104167553A (en) * 2014-06-19 2014-11-26 合肥国轩高科动力能源股份公司 Square winding type battery pole piece and manufacturing technology thereof
CN104170126A (en) * 2013-03-11 2014-11-26 株式会社Lg化学 Cathode including insulating layer on cathode tap and secondary battery including cathode
WO2014191020A1 (en) * 2013-05-28 2014-12-04 Thyssenkrupp System Engineering Gmbh Method for producing an electrode and device for producing an electrode
CN206250283U (en) * 2016-12-02 2017-06-13 东莞新能源科技有限公司 A kind of cathode sheet and battery core
CN109686912A (en) * 2018-12-26 2019-04-26 蜂巢能源科技有限公司 Battery pole piece and preparation method thereof, lithium ion battery
CN111668451A (en) * 2020-05-22 2020-09-15 惠州锂威新能源科技有限公司 Preparation method of pole piece for winding type multi-tab battery cell, pole piece and battery cell
US20200321658A1 (en) * 2016-05-27 2020-10-08 Panasonic Corporation Method for manufacturing secondary battery

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2914338Y (en) * 2005-10-18 2007-06-20 比亚迪股份有限公司 Laminated positive plate of lithium ion secondary battery, pole core and battery thereof
CN104170126A (en) * 2013-03-11 2014-11-26 株式会社Lg化学 Cathode including insulating layer on cathode tap and secondary battery including cathode
WO2014191020A1 (en) * 2013-05-28 2014-12-04 Thyssenkrupp System Engineering Gmbh Method for producing an electrode and device for producing an electrode
CN104167553A (en) * 2014-06-19 2014-11-26 合肥国轩高科动力能源股份公司 Square winding type battery pole piece and manufacturing technology thereof
US20200321658A1 (en) * 2016-05-27 2020-10-08 Panasonic Corporation Method for manufacturing secondary battery
CN206250283U (en) * 2016-12-02 2017-06-13 东莞新能源科技有限公司 A kind of cathode sheet and battery core
CN109686912A (en) * 2018-12-26 2019-04-26 蜂巢能源科技有限公司 Battery pole piece and preparation method thereof, lithium ion battery
CN111668451A (en) * 2020-05-22 2020-09-15 惠州锂威新能源科技有限公司 Preparation method of pole piece for winding type multi-tab battery cell, pole piece and battery cell

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