CN112103474A - Processing method of winding type lithium battery positive plate and winding type lithium battery positive plate - Google Patents
Processing method of winding type lithium battery positive plate and winding type lithium battery positive plate Download PDFInfo
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- CN112103474A CN112103474A CN202010967583.0A CN202010967583A CN112103474A CN 112103474 A CN112103474 A CN 112103474A CN 202010967583 A CN202010967583 A CN 202010967583A CN 112103474 A CN112103474 A CN 112103474A
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- Prior art keywords
- current collector
- lithium battery
- cut
- positive plate
- cutting
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H37/00—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations
- B65H37/04—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations for securing together articles or webs, e.g. by adhesive, stitching or stapling
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a processing method of a winding type lithium battery positive plate and the winding type lithium battery positive plate, belongs to the technical field of energy storage devices, and is designed for solving the problems that burrs are difficult to thoroughly eliminate by the existing processing method. Before the cutting process is executed, a cutting empty foil area exposing the surface of a current collector is formed at a cutting position, active substance coatings are respectively arranged on two sides of the cutting empty foil area, and a rubberizing is pasted at the cutting empty foil area; when the cutting process is executed, the current collector and the adhesive tape are cut simultaneously by the cutter. The processing method of the winding type lithium battery positive plate and the contact area between the adhesive of the winding type lithium battery positive plate and the current collector are large, and the adhesive structure is more stable; burrs can be better prevented from being generated on the end surface of the current collector in the cutting process, so that the internal short circuit of the battery cell caused by the burrs of the positive plate in the winding process of the battery cell is avoided; the processing method is convenient to operate, practical and convenient for batch production.
Description
Technical Field
The invention relates to the technical field of energy storage devices, in particular to a processing method of a winding type lithium battery positive plate, a winding type lithium battery positive plate manufactured by the processing method of the winding type lithium battery positive plate, and a lithium battery comprising the winding type lithium battery positive plate.
Background
The lithium battery is an energy storage device and can provide electric energy for various electric appliances such as mobile phones and the like. The lithium battery is provided with a positive plate, a negative plate, a diaphragm and other structures, and the positive plate, the negative plate and the diaphragm need to be wound into a pole group during processing. Because the positive plate is processed continuously, need cut into the segment according to specific needs. When the cutter is used for cutting, burrs are formed on the end face of the positive plate. The burr is located between two-layer diaphragm after the coiling, and along with the inflation and the shrink of battery charge-discharge in-process pole piece, the burr of positive plate terminal surface probably pierces through the diaphragm and contacts the short circuit with the negative pole of diaphragm opposite side, causes the safety risk.
In order to solve the problem, the existing method for winding and deburring the lithium ion battery pole piece is as follows: coating the active material layer on the mass flow body, forming the positive plate, pasting the sticky tape (namely, one part of the sticky tape is pasted on the mass flow body, the other part is pasted on the active material layer) on the side of the obtained positive plate, and cutting the sticky tape, the mass flow body and the active material layer simultaneously with the cutter to prevent the formation of burrs after the positive plate is cut.
The drawbacks of this method include at least: 1. under the action of shearing force, the deformation capacities of the current collector and the active material layer are different, so that the pulling force applied to the adhesive tape adhered to the current collector and the pulling force applied to the adhesive tape adhered to the active material layer are different during cutting, further the stress on the positive electrode piece is unbalanced, and burrs cannot be thoroughly eliminated; 2. the side surface area of the positive plate is limited, the adhesive tape is poor in adhesion firmness, the adhesive tape is likely to displace when the cutter cuts, the processing efficiency is low, and the yield is low.
Disclosure of Invention
The invention aims to provide a processing method of a winding type lithium battery positive plate, which has the advantages of more thorough burr elimination, firmer rubberizing and pasting and high processing efficiency.
Another object of the present invention is to provide a winding type lithium battery positive plate with more complete burr elimination.
It is a further object of the present invention to provide a lithium battery with a more stable operating state.
To achieve the purpose, on one hand, the invention adopts the following technical scheme:
a processing method of a winding type lithium battery positive plate comprises the steps of forming a cutting empty foil area exposing the surface of a current collector at a cutting position before a cutting process is executed, wherein two sides of the cutting empty foil area are respectively provided with an active substance coating, and pasting a rubberizing at the cutting empty foil area; when the cutting process is executed, the current collector and the adhesive tape are cut by the cutter simultaneously.
In particular, the processing method comprises the following steps:
step S1, preparing the strip-shaped current collector;
step S2 of coating the active material coating on the current collector, exposing the surface of the current collector at the cutting position, and forming the cut-off hollow foil region;
step S3, pasting the rubberizing on the cut empty foil area, wherein the adhesive layer of the rubberizing is pasted on the surface of the current collector;
and step S4, executing a cutting process, and simultaneously cutting the current collector and the rubberizing by a cutter.
In particular, in step S2, the active material coating layer is continuously applied to the current collector, and the active material coating layer at the cutting position is scraped off to form the cut empty foil region; or, the active material coating is coated on the current collector at a position other than the cutting position, and the coating of the active material coating is stopped at the cutting position, so as to form the cut empty foil region.
Particularly, an electrode lug welding empty foil area is formed on the positive plate of the winding type lithium battery, and the two sides of the electrode lug welding empty foil area are provided with the active material coating and the bottom of the active material coating and exposed out of the surface of the current collector.
In particular, the current collector is made of aluminum foil, and has a thickness of 10um to 25 um.
Particularly, the distance from the active substance coating on one side to the active substance coating on the other side of the cut hollow foil area is the length A of the cut hollow foil area, and A belongs to [5mm, 50mm ]; the width B of the cut-off hollow foil area is equal to the width of the current collector.
In particular, the adhesive has a length along the length direction of the cut empty foil region and a width along the width direction of the cut empty foil region; the length C of rubberizing is greater than decide empty regional length A of paper tinsel, the width D of rubberizing is greater than decide empty regional width B of paper tinsel.
Particularly, C-A is more than or equal to 3mm and less than or equal to 10mm, and/or D-B is more than or equal to 1mm and less than or equal to 4mm, and the rubberizing completely covers the cut empty foil area.
On the other hand, the invention adopts the following technical scheme:
the utility model provides a coiling type lithium cell positive plate who is made by foretell coiling type lithium cell positive plate's processing method, includes banding mass flow body and coating the active material coating on the mass flow body, the active material coating is deciding the disconnection of position department in order to form and decides empty paper tinsel region, decide the regional department of empty paper tinsel and expose the surface of mass flow body.
On the other hand, the invention adopts the following technical scheme:
a lithium battery comprises the winding type lithium battery positive plate.
According to the processing method of the wound lithium battery positive plate, the cut-off hollow foil area is formed on the surface of the current collector, the adhesive is tightly adhered to the cut-off hollow foil area, the contact area between the adhesive and the current collector is large, and the adhesive structure is more stable; the adhesive is only adhered to the current collector, and the deformation of the current collector is consistent when the current collector is cut by a cutter, so that the pulling force on the adhesive is balanced, burrs can be better prevented from being generated on the end surface of the current collector in the cutting process, and the internal short circuit of the battery cell caused by the burrs of the positive plate in the winding process of the battery cell is avoided; the processing method is convenient to operate, practical and convenient for batch production.
The lithium battery comprises the wound lithium battery positive plate, burrs can be better prevented from being generated on the end surface of a current collector in the cutting process, so that the internal short circuit of a battery cell caused by the burrs of the positive plate in the winding process of the battery cell is avoided, and the working state of the lithium battery is more stable; the positive plate has high processing efficiency and is convenient for batch production.
Drawings
FIG. 1 is a front view of a pre-processed positive plate for a coiled lithium battery provided in an embodiment of the present invention;
FIG. 2 is an exploded view of a positive plate of a rolled lithium battery provided in accordance with an embodiment of the present invention before processing;
fig. 3 is a front view of a positive electrode sheet of a lithium battery according to an embodiment of the present invention.
In the figure:
1. a current collector; 2. cutting off the empty foil area; 3. gluing; 4. welding a tab with an empty foil area; 5. an active material coating; 6. and (7) a tab.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment discloses a method for processing a positive plate of a winding type lithium battery, a winding type lithium battery positive plate manufactured by the method for processing the positive plate of the winding type lithium battery, and a lithium battery comprising the winding type lithium battery positive plate. The processing method comprises the following steps: before the cutting process is executed, a cutting empty foil area 2 exposing the surface of the current collector 1 is formed at a cutting position, active substance coatings 5 are respectively arranged on two sides of the cutting empty foil area 2, and the adhesive 3 is adhered to the cutting empty foil area 2; when the cutting process is executed, the current collector 1 and the rubberizing 3 are simultaneously cut by the cutter. The topping tape 3 may be, but is not limited to, a high temperature tape.
Correspondingly, the winding type lithium battery positive plate manufactured by the processing method comprises a strip-shaped current collector 1 and an active substance coating 5 coated on the current collector 1, wherein the active substance coating 5 is cut off at a cutting position to form a cutting empty foil area 2, and the surface of the current collector 1 is exposed at the cutting empty foil area 2.
The active material coating 5 functions to intercalate and deintercalate lithium ions, and to store and pass electric energy of the lithium battery. The cutting position is positioned at the edge of the positive plate, and the area is small, so that the normal work of the positive plate is not influenced by the non-active substance coating 5. The surface of the current collector 1 is directly exposed at the cutting position, the adhesive 3 is directly adhered to the current collector 1, the contact area between the adhesive 3 and the current collector 1 is large, and the adhering structure is more stable; the adhesive 3 is only adhered to the current collector 1, and the deformation of the current collector 1 is consistent when the current collector is cut by a cutter, so that the pulling force on the adhesive 3 is balanced, burrs can be better prevented from being generated on the end surface of the current collector 1 in the cutting process, and the internal short circuit of a battery cell caused by the burrs of a positive plate in the winding process of the battery cell is avoided; the processing method is convenient to operate, practical and convenient for batch production.
The specific steps of the processing method are not limited, and it is sufficient to form the cut foil area 2 on the surface of the current collector 1 and adhere the adhesive 3 to the cut foil area 2. Preferably, the processing method comprises the following steps:
and step S1, preparing the strip-shaped current collector 1. Preferably, current collector 1 is made by the aluminium foil, and thickness is 10um to 25um, and preferred thickness value is 10um, 12um, 14um, 15um, 20um or 25um etc..
Step S2 is to coat the active material coating 5 on the current collector 1, and to form the cut hollow foil region 2 by exposing the surface of the current collector 1 at the cutting position. The specific method of forming the cut-off blank foil region 2 is not limited, and preferably, the active material coating 5 may be continuously applied to the current collector 1, and the cut-off blank foil region 2 may be formed by scraping off the active material coating 5 at the cut-off position; it is also possible to apply the active material coating 5 at a non-cutting position on the current collector 1 and stop applying the active material coating 5 at the cutting position to form the cut-off foil area 2.
In step S3, the adhesive 3 is applied to the cut foil area 2, and the adhesive layer of the adhesive 3 is applied to the surface of the current collector 1. The active substance coating 5 is arranged on both sides of the cut empty foil area 2, the distance from the active substance coating 5 on one side to the active substance coating 5 on the other side is defined as the length A of the cut empty foil area 2, and the A belongs to [5mm, 50mm ], preferably 5mm, 15mm, 25mm, 35mm or 45mm and the like; the direction perpendicular to the longitudinal direction is the width direction, and the width B of the cut-out foil region 2 is equal to the width of the current collector 1.
The length of the adhesive tape 3 in the longitudinal direction of the cut blank foil region 2 and the width of the adhesive tape 3 in the width direction of the cut blank foil region 2 are defined as follows. The length C of the adhesive 3 is greater than the length A of the cut empty foil area 2, and the width D of the adhesive 3 is greater than the width B of the cut empty foil area 2. Preferably, C-A is more than or equal to 3mm and less than or equal to 10mm, D-B is more than or equal to 1mm and less than or equal to 4mm, the cut hollow foil area 2 is completely covered by the adhesive 3, the whole cut hollow foil area 2 can be cut, the operation is more convenient, and the cutting knife is prevented from being aligned to the adhesive 3 in a time-consuming manner when the cutting is carried out. Since the adhesive 3 is longer than the cut foil area 2, both ends of the adhesive 3 are inevitably stuck to the active material coatings 5, respectively, and in order to avoid imbalance in the pulling force of the active material coatings 5 on both sides to the adhesive 3, it is preferable to make the adhesive width between the adhesive 3 and the active material coatings 5 on both sides the same, as shown in fig. 3, C1-a1 ≈ C2-a 2.
And step S4, executing a cutting process, and simultaneously cutting the current collector 1 and the rubberizing 3 by a cutter. The end face of the obtained current collector 1 is smoother, and burrs are avoided.
And a tab welding empty foil area 4 is also formed on the positive plate of the winding lithium battery, wherein the two sides of the tab welding empty foil area 4 are provided with active substance coatings 5, and the bottom of the tab welding empty foil area is exposed out of the surface of the current collector 1. When a winding type lithium battery positive plate is processed, a tab 6 is welded at the position of a tab welding empty foil area 4, and then protective layers are arranged on the whole tab welding empty foil area 4 and the tab 6, so that the exposed current collector 1 can be protected on one hand, and the tab 6 is prevented from falling off from the current collector 1 on the other hand.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A processing method of a winding type lithium battery positive plate is characterized in that a cutting empty foil area (2) exposing the surface of a current collector (1) is formed at a cutting position before a cutting process is executed, active substance coatings (5) are respectively arranged on two sides of the cutting empty foil area (2), and a rubberizing (3) is pasted at the cutting empty foil area (2); when the cutting process is executed, the current collector (1) and the rubberizing (3) are cut by the cutter at the same time.
2. The method of processing a positive electrode sheet for a rolled lithium battery according to claim 1, comprising the steps of:
step S1, preparing the strip-shaped current collector (1);
step S2 of applying the active material coating layer (5) on the current collector (1), and forming the cut-off hollow foil region (2) by exposing the surface of the current collector (1) at the cut-off position;
step S3, adhering the adhesive (3) to the cut empty foil area (2), wherein the adhesive layer of the adhesive (3) is adhered to the surface of the current collector (1);
and step S4, executing a cutting process, and simultaneously cutting the current collector (1) and the rubberizing (3) by a cutter.
3. The method of processing a positive electrode sheet for a lithium battery according to claim 2, wherein in step S2, the active material coating layer (5) is continuously applied to the current collector (1), and the cut-off empty foil region (2) is formed by scraping off the active material coating layer (5) at the cut-off position; or the like, or, alternatively,
applying the active material coating (5) on the current collector (1) at a position other than the cutting position, and stopping applying the active material coating (5) at the cutting position to form the cut-off empty foil region (2).
4. The processing method of the positive plate of the coiled lithium battery as claimed in any one of claims 1 to 3, wherein a tab welding empty foil area (4) is further formed on the positive plate of the coiled lithium battery, the active material coating (5) is arranged on two sides of the tab welding empty foil area (4), and the surface of the current collector (1) is exposed at the bottom of the tab welding empty foil area.
5. The method for processing a positive electrode sheet for a coiled lithium battery according to any one of claims 1 to 3, wherein the current collector (1) is made of aluminum foil and has a thickness of 10 to 25 um.
6. A method of processing a positive electrode sheet for a lithium battery in a roll form according to any one of claims 1 to 3, wherein the distance from the active material coating layer (5) on one side to the active material coating layer (5) on the other side of the cut-off foil region (2) is a length a, a e [5mm, 50mm ]; the width B of the cut-off hollow foil area (2) is equal to the width of the current collector (1).
7. The method for processing a positive electrode sheet for a lithium battery according to claim 6, wherein the adhesive (3) has a length in a longitudinal direction of the cut-off foil area (2) and a width in a width direction of the cut-off foil area (2); the length C of rubberizing (3) is greater than decide the length A of empty foil region (2), the width D of rubberizing (3) is greater than decide the width B of empty foil region (2).
8. The processing method of the positive plate of the coiled lithium battery as claimed in claim 7, wherein C-A is more than or equal to 3mm and less than or equal to 10mm, and/or D-B is more than or equal to 1mm and less than or equal to 4mm, and the rubberizing (3) completely covers the cut empty foil area (2).
9. A coiled lithium battery positive electrode sheet manufactured by the processing method of the coiled lithium battery positive electrode sheet according to any one of claims 1 to 8, comprising a strip-shaped current collector (1) and an active material coating (5) coated on the current collector (1), wherein the active material coating (5) is broken at a cutting position to form a cut-off hollow foil area (2), and the surface of the current collector (1) is exposed at the cut-off hollow foil area (2).
10. A lithium battery comprising the positive electrode sheet for a rolled lithium battery according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010967583.0A CN112103474A (en) | 2020-09-15 | 2020-09-15 | Processing method of winding type lithium battery positive plate and winding type lithium battery positive plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010967583.0A CN112103474A (en) | 2020-09-15 | 2020-09-15 | Processing method of winding type lithium battery positive plate and winding type lithium battery positive plate |
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| CN112103474A true CN112103474A (en) | 2020-12-18 |
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| CN202010967583.0A Pending CN112103474A (en) | 2020-09-15 | 2020-09-15 | Processing method of winding type lithium battery positive plate and winding type lithium battery positive plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903921A (en) * | 2021-11-18 | 2022-01-07 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| WO2022188400A1 (en) * | 2021-03-12 | 2022-09-15 | 横店集团东磁股份有限公司 | Cylindrical lithium ion battery and manufacturing method therefor |
| WO2024007258A1 (en) * | 2022-07-07 | 2024-01-11 | 宁德时代新能源科技股份有限公司 | Electrode sheet assembly, electrode assembly, battery cell, battery, and electric device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20201218 |