CN114447266A - Pole piece, roll up core and battery - Google Patents
Pole piece, roll up core and battery Download PDFInfo
- Publication number
- CN114447266A CN114447266A CN202111547797.3A CN202111547797A CN114447266A CN 114447266 A CN114447266 A CN 114447266A CN 202111547797 A CN202111547797 A CN 202111547797A CN 114447266 A CN114447266 A CN 114447266A
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- China
- Prior art keywords
- pole piece
- insulating layer
- current collector
- winding core
- insulating
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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
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a pole piece, a winding core and a battery, wherein the pole piece comprises a current collector, and an active layer and an insulating layer which are arranged on the current collector, wherein the active layer and the insulating layer are respectively arranged in the width direction of the current collector in a full-length mode, and the active layer and the insulating layer are alternately arranged at intervals in the length direction of the current collector. Compared with the prior art, the invention effectively improves the conditions of pole piece light leakage and pole piece fracture which may occur in the hot pressing or using process of the corner position of the inner/outer ring of the winding type winding core on the premise of not influencing the battery performance, and simultaneously, the insulating layer is arranged in the head and tail feeding and ending areas of the pole piece of the winding core, thereby improving the problem of dust and particle falling when the pole piece is cut off. Above all can promote the security of using electric core by a wide margin, reduce the electric core short circuit inefficacy risk that pole piece fracture and granule lead to.
Description
Technical Field
The invention relates to the technical field of battery design and manufacture, in particular to a pole piece, a winding core and a battery.
Background
At present, two mainstream assembly processes, namely a lamination process and a winding process, exist in the conventional lithium ion. The winding process is high in efficiency and speed, and is approved by lithium battery manufacturers. However, the winding type battery has a winding corner, and the corner of the inner ring is bent greatly, so that the problem of light transmission or breakage is easily caused under high pressure, and the consistency and safety of the lithium battery are seriously influenced.
In the prior art, for the safety problem of corner fracture, chinese patent CN110364769A discloses a winding battery core and a battery, and the problem of pole piece fracture during hot pressing or recycling is solved by adopting a pole piece rubberizing mode inside the winding core. However, the method increases the thickness of the positive pole piece by rubberizing the corner of the positive pole piece, and the corresponding rubberizing area can generate a high-stress environment to influence the local electrical property. The corner of the negative pole piece can cover a negative pole lithium intercalation active area, and the lithium intercalation function of a local position near the area can be influenced, so that abnormal conditions such as lithium precipitation and the like can be caused;
in addition, because the pole piece cutting is needed to be done to coiling type core head pan feeding and afterbody final phase department, directly adopt five metals or laser to cut the problem that probably leads to the powder to drop in active material department, lead to the battery from discharging too big.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a pole piece, a winding core and a battery, which have high safety and long service life and do not influence the performance of the battery.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a pole piece, includes the mass flow body and collects active layer and insulating layer on the body, active layer and insulating layer lay along the width direction full length of the body respectively, active layer and insulating layer lay along the length direction interval in turn of the mass flow body.
Further, the contact area between the active layer and the insulating layer has an overlapping area.
Further, the material of the insulating layer comprises an insulating ceramic material and an insulating glue material.
Further, the insulating ceramic material comprises one or more of alumina, zirconia and magnesia.
Further, the insulating rubber material comprises one or more of polyvinylidene fluoride, styrene butadiene rubber, polytetrafluoroethylene and polyacrylic acid.
Further, the current collector is an aluminum foil, a copper foil or a stainless steel foil.
A winding core comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate and the negative plate are provided with the pole pieces, and the distribution area of an insulating layer comprises the corner area of the winding core.
Further, the distribution area of the insulating layer also comprises a pole piece end part.
Furthermore, the insulating layer on the positive plate completely covers the insulating layer on the corresponding position of the negative plate.
A battery comprises the winding core.
Compared with the prior art, the invention has the following beneficial effects:
(1) the pole piece comprises a current collector, and an active layer and an insulating layer which are arranged on the current collector, wherein the active layer and the insulating layer are respectively arranged along the width direction of the current collector in a full-length mode, the active layer and the insulating layer are alternately arranged along the length direction of the current collector at intervals, the insulating layer is positioned in the corner area of a winding core, and the problems of light transmission and breakage of the pole piece after the pole piece is bent at 180 degrees in a winding type winding core inner ring, particularly in a pole piece product designed in a high-compaction mode, can be effectively solved, so that the risk of short circuit in a battery is reduced, and the safety characteristic of the battery is improved; the outer ring of the winding type winding core can effectively improve the breaking strength of the pole piece, reduce the problem that the corner winding core pole piece is pulled to crack after long circulation of the winding type winding core, particularly under the condition of high expansion force, improve the safety characteristic and prolong the service life of the battery, the insulating layer is directly contacted with the current collector, the thickness of the pole piece cannot be increased, the local electrical property of the battery cell cannot be influenced, equipment and processes are not additionally added in the processing process of the pole piece, and the cost is low;
(2) according to the invention, the insulating layers are arranged at the end parts of the pole pieces, namely the feeding and ending positions of the winding core, the cutting positions are positioned at the insulating layers, so that the situation that dust and particles at the cutting positions fall off can be effectively reduced, the self-discharge of the battery is reduced, the safety is improved, the thickness of the insulating layers is controllable, the cutting device is suitable for the cutting manufacturability of the pole pieces, and no cutting dust is generated;
(3) according to the invention, the contact area between the active layer and the insulating layer has an overlapping area, so that the current collector is covered by the active layer or the insulating layer, and no empty uncoated area exists on the current collector;
(4) the material of the insulating layer comprises an insulating ceramic material and an insulating adhesive material, wherein the insulating ceramic material comprises one or more of alumina, zirconia and magnesia, the insulating adhesive material comprises one or more of polyvinylidene fluoride, styrene butadiene rubber, polytetrafluoroethylene and polyacrylic acid, and the insulating layer has better toughness, strength and insulating property;
(5) the insulating layer on the positive plate completely covers the insulating layer on the corresponding position of the negative plate so as to ensure that the lithium is not separated during the charging of the battery.
Drawings
FIG. 1 is a schematic diagram of a battery;
FIG. 2 is a top view of a pole piece;
FIG. 3 is a cross-sectional view of a pole piece;
the reference numbers in the figures illustrate:
1. current collector, 2 active layer, 3 insulating layer.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A pole piece, as shown in fig. 2 and fig. 3, comprises a current collector 1, and an active layer 2 and an insulating layer 3 on the current collector 1, wherein the active layer 2 and the insulating layer 3 are respectively arranged along the width direction of the current collector 1, and the active layer 2 and the insulating layer 3 are alternately arranged at intervals along the length direction of the current collector 1.
Since the gap coating has a certain coating length tolerance for the active layer 2 or the insulating layer 3 with a fixed coating length, in order to ensure that no empty uncoated area exists on the current collector 1, the contact area between the active layer 2 and the insulating layer 3 has an overlapping area, the length of the overlapping area along the length direction of the pole piece ranges from 0mm to 100mm, preferably ranges from 0mm to 30mm, and the current collector 1 is ensured to be covered by the active layer 2 or the insulating layer 3.
The insulating layer is formed by mixing an insulating ceramic material and an insulating rubber material, wherein the insulating ceramic material comprises one or more of alumina, zirconia and magnesia, and the insulating rubber material comprises one or more of polyvinylidene fluoride, styrene-butadiene rubber, polytetrafluoroethylene and polyacrylic acid;
the insulating layer 3 has good toughness, strength and insulating property, and can effectively improve the problems of light transmission and fracture of a pole piece after the pole piece is bent at 180 degrees in an inner ring of a winding type winding core, particularly in a pole piece product designed in a high compaction mode, so that the risk of short circuit in a battery is reduced, and the safety property of the battery is improved; in addition, the thickness of the insulating layer 3 is controllable, the insulating layer is suitable for hardware cutting or laser cutting, cutting dust is not generated, and the insulating layer is particularly suitable for cutting pole pieces with thick coating thickness.
The pole piece with the insulating layer 3 can effectively improve the breaking strength of the pole piece on the outer ring of the winding type winding core, and reduce the problem that the corner winding core pole piece is cracked after long circulation, particularly under the condition of high expansion force.
The safety characteristic of the battery is improved;
the processing process of the pole piece comprises the following steps:
in the process of coating the active layer 2 on the current collector 1, the insulating layer 3 is coated in a clearance mode, the active layer 2 and the insulating layer 3 are uniformly coated in the width direction of the current collector 1, and the coating clearance length of the insulating layer 3 is accurately controlled through a clearance valve and the coating tape speed.
The processing process of the pole piece does not additionally increase equipment and process, the insulating layer is directly contacted with the current collector, the thickness of the pole piece cannot be increased, and the local electrical property of the battery cell is not influenced.
The thickness range of insulating layer 3 is 1um ~ 200um, and preferred thickness range is 10um ~ 80 um.
The current collector 1 is an aluminum foil, a copper foil or a stainless steel foil.
Example 2
A winding core comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate and the negative plate adopt the plate in example 1, and the distribution area of an insulating layer 3 comprises the corner area of the winding core and the end part of the plate.
The insulating layer 3 can be coated on the current collector 1 of the positive plate or/and the negative plate, a single plate has a fixed length, the number of the insulating layers 3 coated on the single plate can be one or more, and the specific number depends on the number of corners in the winding core;
the insulating layer 3 is arranged in the corner area of the winding core, and the problems of light transmission and breakage of the pole piece after the pole piece is bent at 180 degrees in the inner ring of the winding core, particularly in a pole piece product with high compaction design, can be effectively solved, so that the risk of short circuit in the battery is reduced, and the safety characteristic of the battery is improved; the outer ring of the winding type winding core can effectively improve the breaking strength of the pole piece, reduce the problem that the corner winding core pole piece is cracked after long circulation of the winding type winding core, particularly under the condition of high expansion force, improve the safety characteristic and the service life of the battery,
according to the invention, the insulating layers 3 are arranged at the end parts of the pole pieces, namely the feeding and ending positions of the winding core, so that the cutting position is positioned at the insulating layer, the situation that dust and particles at the cutting position fall off can be effectively reduced, the self-discharge of the battery is reduced, and the safety is improved.
As shown in fig. 1, the insulating layer 3 on the positive plate completely covers the insulating layer 3 on the corresponding position of the negative plate to ensure that the battery is charged without lithium deposition.
Example 3
A battery comprising the winding core of embodiment 2.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The pole piece is characterized by comprising a current collector (1), and an active layer (2) and an insulating layer (3) which are arranged on the current collector (1), wherein the active layer (2) and the insulating layer (3) are respectively arranged along the width direction of the current collector (1), and the active layer (2) and the insulating layer (3) are alternately arranged at intervals along the length direction of the current collector (1).
2. A pole piece according to claim 1, characterized in that there is an overlap in the contact area between the active layer (2) and the insulating layer (3).
3. A pole piece according to claim 1, characterized in that the material of the insulating layer (3) comprises insulating ceramic material and insulating glue material.
4. A pole piece according to claim 3, wherein said insulating ceramic material comprises one or more of alumina, zirconia and magnesia.
5. A pole piece as claimed in claim 3, wherein the insulating adhesive material comprises one or more of polyvinylidene fluoride, styrene butadiene rubber, polytetrafluoroethylene and polyacrylic acid.
6. A pole piece according to claim 1, characterized in that the current collector (1) is an aluminum foil, a copper foil or a stainless steel foil.
7. A winding core, characterized by comprising a positive plate, a negative plate and a diaphragm, wherein the positive plate and the negative plate adopt the plate of any one of claims 1 to 6, and the distribution area of the insulating layer (3) comprises the corner area of the winding core.
8. Winding core according to claim 7, characterized in that the distribution area of the insulating layer (3) also comprises pole piece ends.
9. A winding core according to claim 7, characterized in that the insulating layer (3) on the positive electrode sheet completely covers the insulating layer (3) on the corresponding position of the negative electrode sheet.
10. A battery comprising a jellyroll according to any one of claims 7-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111547797.3A CN114447266A (en) | 2021-12-16 | 2021-12-16 | Pole piece, roll up core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111547797.3A CN114447266A (en) | 2021-12-16 | 2021-12-16 | Pole piece, roll up core and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114447266A true CN114447266A (en) | 2022-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111547797.3A Pending CN114447266A (en) | 2021-12-16 | 2021-12-16 | Pole piece, roll up core and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114447266A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020632A (en) * | 2022-08-10 | 2022-09-06 | 江苏时代新能源科技有限公司 | Positive pole piece and preparation method thereof, electrode assembly, battery monomer and battery |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205992575U (en) * | 2016-07-21 | 2017-03-01 | 中航锂电（洛阳）有限公司 | Positive plate and coiled lithium-ion power battery core and lithium-ion-power cell |
| CN209071507U (en) * | 2018-12-29 | 2019-07-05 | 蜂巢能源科技有限公司 | Pole piece and Special-shaped battery |
| CN112687964A (en) * | 2018-11-05 | 2021-04-20 | 宁德新能源科技有限公司 | Electrochemical device |
| CN214254464U (en) * | 2020-12-02 | 2021-09-21 | 惠州锂威新能源科技有限公司 | Safe lithium ion battery positive plate and lithium ion battery |
| CN113646917A (en) * | 2019-04-09 | 2021-11-12 | 株式会社村田制作所 | Battery with a battery cell |
| CN113707843A (en) * | 2021-09-29 | 2021-11-26 | 珠海冠宇电池股份有限公司 | Battery cell and electrochemical device |
| CN215008336U (en) * | 2021-03-31 | 2021-12-03 | 惠州锂威新能源科技有限公司 | Safe lithium ion battery rolls up core, lithium ion battery |
-
2021
- 2021-12-16 CN CN202111547797.3A patent/CN114447266A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205992575U (en) * | 2016-07-21 | 2017-03-01 | 中航锂电（洛阳）有限公司 | Positive plate and coiled lithium-ion power battery core and lithium-ion-power cell |
| CN112687964A (en) * | 2018-11-05 | 2021-04-20 | 宁德新能源科技有限公司 | Electrochemical device |
| CN209071507U (en) * | 2018-12-29 | 2019-07-05 | 蜂巢能源科技有限公司 | Pole piece and Special-shaped battery |
| CN113646917A (en) * | 2019-04-09 | 2021-11-12 | 株式会社村田制作所 | Battery with a battery cell |
| CN214254464U (en) * | 2020-12-02 | 2021-09-21 | 惠州锂威新能源科技有限公司 | Safe lithium ion battery positive plate and lithium ion battery |
| CN215008336U (en) * | 2021-03-31 | 2021-12-03 | 惠州锂威新能源科技有限公司 | Safe lithium ion battery rolls up core, lithium ion battery |
| CN113707843A (en) * | 2021-09-29 | 2021-11-26 | 珠海冠宇电池股份有限公司 | Battery cell and electrochemical device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020632A (en) * | 2022-08-10 | 2022-09-06 | 江苏时代新能源科技有限公司 | Positive pole piece and preparation method thereof, electrode assembly, battery monomer and battery |
| CN115020632B (en) * | 2022-08-10 | 2022-11-25 | 江苏时代新能源科技有限公司 | Positive pole piece and preparation method thereof, electrode assembly, battery monomer and battery |
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