CN112687840A - Electrode sheet and battery - Google Patents
Electrode sheet and battery Download PDFInfo
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- CN112687840A CN112687840A CN202011577515.XA CN202011577515A CN112687840A CN 112687840 A CN112687840 A CN 112687840A CN 202011577515 A CN202011577515 A CN 202011577515A CN 112687840 A CN112687840 A CN 112687840A
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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
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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
Abstract
The present invention provides an electrode sheet and a battery, the electrode sheet including: a current collector; the active material layer comprises a first active material layer arranged on the first surface of the current collector; the glue film, the glue film is established in the first empty foil region of mass flow body, and first empty foil region is the regional that mass flow body first surface does not be equipped with first active material layer, and the glue film is including establishing the first glue film in first empty foil region. According to the invention, the adhesive layer is formed in the empty foil area of the electrode plate, so that the stress on two sides of the electrode plate is consistent, and the problem that the battery performance is low due to the wrinkles on the surface of the electrode plate is avoided, thereby improving the stability of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an electrode plate and a battery.
Background
At present, most of lithium ion batteries on the market adopt a winding type production process, namely, a positive plate, a negative plate and a diaphragm are combined and formed in a winding mode to form a battery core, and the battery formed by the battery core is called as a winding type battery.
However, in the production process of the wound battery, there may be a situation that the coverage areas of the active material layers on the two sides of the current collector are not consistent, and there are empty foil regions on the two sides of the current collector, which results in different stresses on the two sides of the current collector, and the surface of the electrode sheet produced under the situation may have wrinkles, and the electrode active material at the wrinkles cannot normally participate in the electrochemical reaction, which seriously affects the performance of the battery.
Disclosure of Invention
The embodiment of the invention aims to provide an electrode plate and a battery, and solves the technical problem that the performance of the battery is influenced due to the fact that wrinkles appear on the surface of the electrode plate.
In order to achieve the above object, an embodiment of the present invention provides an electrode sheet, including:
a current collector;
an active material layer comprising a first active material layer disposed on a first surface of the current collector;
the glue film, the glue film is established the first empty foil area of mass flow body, first empty foil area does the mass flow body first surface does not be equipped with the region of first active substance layer, the glue film is including establishing the regional first glue film of first empty foil.
Optionally, the glue film is the rubberizing that first compound is constituteed, the thickness of rubberizing is 1um to 10 um.
Optionally, the glue layer is a coating layer composed of a second compound, and the thickness of the coating layer is 1um to 5 um.
Optionally, the active material layer comprises a second active material layer disposed on a second surface of the current collector;
the glue film still establishes the empty foil of second of mass flow body is regional, the empty foil of second is regional do the mass flow body second surface is not equipped with the region of second active substance layer, the glue film is including establishing the empty foil of second is regional second glue film.
Optionally, the first and second empty foil regions are located at a head of the current collector.
Optionally, the electrode plate further comprises a tab disposed in the first empty foil region;
the ratio of the area of the first adhesive layer to the area of the first empty foil region is 70% to 95%, and the ratio of the area of the second adhesive layer to the area of the second empty foil region is greater than 80%.
Optionally, a ratio of an area of the first glue layer to an area of the first empty foil region is 85% to 95%, and a ratio of an area of the second glue layer to an area of the second empty foil region is greater than 90%.
Optionally, the electrode plate further comprises a tab arranged in a coating area, the tab is connected with the current collector, and the coating area is an area where the active material layer is arranged on the surface of the current collector;
the ratio of the area of the first adhesive layer to the area of the first empty foil region is greater than 80%, and the ratio of the area of the second adhesive layer to the area of the second empty foil region is greater than 80%.
Optionally, a ratio of an area of the first glue layer to an area of the first empty foil region is greater than 90%, and a ratio of an area of the second glue layer to an area of the second empty foil region is greater than 90%.
The embodiment of the invention also provides a battery, which comprises the electrode plate, the battery comprises a packaging shell and a winding battery cell, the winding battery cell is formed by winding a first pole piece, a diaphragm and a second pole piece after being stacked, the first pole piece is the electrode plate, and in the winding battery cell, the adhesive layer is positioned inside the winding battery cell.
One of the above technical solutions has the following advantages or beneficial effects:
the active material layer coverage area may not be uniform on both sides of the current collector, and thus there may be empty foil areas on both sides of the current collector. In the embodiment of the invention, the adhesive layer is formed in the empty foil area of the current collector, so that the stress on two sides of the current collector is consistent, and the problem that the battery performance is low due to the wrinkles on the surface of the electrode plate is avoided, thereby improving the stability of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a structural diagram of an electrode pad according to an embodiment of the present invention;
fig. 2 is another structural diagram of an electrode sheet according to an embodiment of the present invention;
fig. 3 is a further structural diagram of an electrode pad provided in an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
30 | Glue layer |
| 20 | |
31 | First adhesive layer |
| 21 | A first |
32 | Second adhesive layer |
| 22 | Second |
40 | Tab for fixing a terminal |
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrode sheet according to an embodiment of the present invention. The electrode sheet includes:
a current collector 10; an active material layer 20, the active material layer 20 including a first active material layer 21 provided on a first surface of the current collector 10; glue film 30, glue film 30 establishes the first empty foil area of mass flow body 10, first empty foil area does the mass flow body 10 first surface is not equipped with the region of first active substance layer 21, glue film 30 is including establishing the regional first glue film 31 of first empty foil.
The electrode sheet in this embodiment may be a negative electrode sheet or a positive electrode sheet, and in a preferred embodiment, the electrode sheet is a negative electrode sheet. The active material layer 20 includes a first active material layer 21 provided on the first surface of the current collector 10.
The current collector 10 may be a copper foil, or a foil made of another material.
There may be a case where the first active material layer 21 is provided only on a partial area of the first surface of the current collector 10, that is, there is an area of the first surface of the current collector 10 where the first active material layer 21 is not provided, and an area of the first surface of the current collector 10 where the first active material layer 21 is not provided is referred to as a first empty foil area.
In this embodiment, the adhesive layer 30 is disposed in the first empty foil area, the adhesive layer 30 is composed of a non-soluble colloid or a non-soluble glue, the stress on both sides of the current collector 10 is balanced by disposing the adhesive layer 30, and the non-soluble adhesive layer 30 does not electrochemically react with the electrolyte, so as to ensure the normal performance of the battery.
It should be understood that the above-mentioned glue layers 30 comprise a first glue layer 31, and the glue layer 30 provided in the first empty foil area is referred to as the first glue layer 31.
It should be understood that, in order to secure the conductive performance of the electrode sheet, the thickness of the gel layer 30 is defined to be smaller than that of the active material layer 20.
In the embodiment of the invention, the adhesive layer 30 is formed in the empty foil area of the current collector 10, so that the stresses on two sides of the current collector 10 are consistent, and the problem that the battery performance is low due to the wrinkles on the surface of an electrode plate is avoided, thereby improving the stability of the battery.
Optionally, the glue layer 30 is a rubberizing composed of a first compound, and the thickness of the rubberizing is 1um to 10 um.
Preparing a rubberizing glue by using a first compound, wherein the rubberizing glue is in a roll shape and has adhesive property; cutting the adhesive according to the size of the electrode slice; and arranging the rubberizing on the empty foil area of the electrode plate by using a glue pressing device.
An alternative embodiment is to form the glue layer 30 on the first and second empty foil regions of the electrode sheet using a winding process.
In the above embodiment, the first compound is used to prepare a coating adhesive in a roll shape, which has adhesiveness and does not electrochemically react with the electrolyte.
Further, the first compound comprises 25% to 37.5% of acrylamide, 12.5% to 25% of methacrylic acid or 12.5% to 25% of acrylic acid, 6.25% to 12.5% of methyl methacrylate, 1.25% to 6.25% of polyvinyl alcohol, 18.75% to 31.25% of styrene and 1.25% to 3.75% of emulsifier. It is understood that in some embodiments, the skim coating may also be prepared by adjusting the ratios of the components of the first compound.
In this embodiment, the rubberizing is cut into the same or similar size with the electrode sheet through cutting knife or other cutting tools. In order to cover the entire surface of the electrode sheet with the adhesive, the size of the cut adhesive is not smaller than the size of the electrode sheet.
The adhesive pressing device in one embodiment may be a vacuum rubber roller, the adhesive is adsorbed on the vacuum rubber roller, the surface of the current collector 10 is scanned by using a charge-coupled device, the position of the empty foil area of the current collector 10 is determined, and the vacuum rubber roller is controlled to press and paste the adhesive on the empty foil area of the electrode plate.
In the above embodiment, the position of the empty foil area may also be located without using a charge-coupled device, and the vacuum rubber roller is directly controlled to press and paste the paste on the surface of the electrode sheet.
In some embodiments, the adhesive pressing device may be other devices capable of pressing the adhesive to the empty foil area, which are not described herein.
Optionally, the glue layer is a coating layer composed of a second compound, and the thickness of the coating layer is 1um to 5 um.
Preparing glue solution by using a second compound; coating the glue solution to the empty foil area of the electrode plate by using a coating device; and drying the glue solution arranged in the empty foil area to form the glue layer 30.
An alternative embodiment is to use a coating process to form the glue layer 30 in the empty foil area of the electrode sheet.
In the above embodiment, the second compound is used to prepare an emulsion-like liquid adhesive that has adhesiveness and does not electrochemically react with the electrolyte.
The second compound at least comprises acrylamide, methacrylic acid, acrylic acid, methyl methacrylate, polyvinyl alcohol, styrene, an emulsifier and deionized water.
Further, the second compound comprises 25% to 37.5% of acrylamide, 12.5% to 25% of methacrylic acid or 12.5% to 25% of acrylic acid, 6.25% to 12.5% of methyl methacrylate, 1.25% to 6.25% of polyvinyl alcohol, 18.75% to 31.25% of styrene, 1.25% to 3.75% of emulsifier and 10% to 35% of deionized water. It is understood that in some embodiments, the glue solution may also be prepared by adjusting the ratio of the components of the second compound.
In an embodiment, the coating device may be a micro-gravure roll coater, the glue solution is coated on the empty foil area of the electrode sheet by using the micro-gravure roll coater, and then the coated electrode sheet is placed in an oven to be baked, so as to dry the glue solution. In a preferred embodiment, the baking temperature is set to 60 ℃ to 80 ℃, and the electrode sheet is baked at a speed of 30m/min to 60 m/min.
In another embodiment, the coating device may be other coating devices, and this embodiment is not described herein.
Optionally, the active material layer has a thickness of 80um to 130 um.
It is to be understood that the active material layer 20 includes a binder, a conductive agent, and an electrode active material including at least one of a carbon-based active material, a silicon-based active material, and an alloy-based active material.
Optionally, the active material layer 20 includes a second active material layer 22 provided on the second surface of the current collector 10;
In this embodiment, the first active material layer 21 disposed on the first surface of the current collector 10 and the second active material layer 22 disposed on the second surface of the current collector 10 may be composed of the same active material or different active materials, and are not limited herein.
There may be a case where the second active material layer 22 is provided only on a partial area of the second surface of the current collector 10, that is, there is an area of the second surface of the current collector 10 where the second active material layer 22 is not provided, and an area of the second surface of the current collector 10 where the second active material layer 22 is not provided is referred to as a second empty foil area.
It should be understood that the above-mentioned glue layers 30 further comprise a second glue layer 32, and the glue layer 30 provided in the second empty foil area is referred to as the second glue layer 32.
It is to be understood that if the first adhesive layer 31 is thicker than the second adhesive layer 32 and the first active material layer 21 is thinner than the second adhesive layer 32, the thickness of the first adhesive layer 31 should be smaller than the thickness of the first active material layer 21.
There may be a case where the active material layers 20 on both sides of the current collector 10 may be unevenly attached, resulting in a first empty foil area on the first surface of the current collector 10 and a second empty foil area on the second surface of the current collector 10. It should be noted that, if the first empty foil area is larger than the second empty foil area, it indicates that there are more active material layers 20 disposed on one side of the first surface of the current collector 10, and thus, the stress on the first surface of the current collector 10 is larger than the stress on the second surface of the current collector 10, which causes different stresses on two sides of the electrode plate, and in this case, the surface of the electrode plate may have wrinkles, which further affects the performance of the battery. It should be noted that the above problem may also occur if the second empty foil area is larger than the first empty foil area.
Optionally, the first and second empty foil regions are located at the head of the current collector 10.
Referring to fig. 1, in the present embodiment, as shown in the figure, the first adhesive layer 31 disposed in the first empty foil area and the second adhesive layer 32 disposed in the second empty foil area are both disposed at the head of the current collector 10, and the adhesive layer 30 is not disposed at the tail of the current collector 10.
It should be understood that the end of the electrode sheet inside the jelly roll after the winding process is completed is referred to as the head of the current collector 10.
Optionally, the electrode sheet further comprises a tab 40 disposed in the first empty foil region; the ratio of the area of the first glue layer 31 to the area of the first empty foil region is 70% to 95%; the ratio of the area of the second glue layer 32 to the area of the second empty foil area is greater than 80%.
Optionally, a ratio of an area of the first glue layer to an area of the first empty foil region is 85% to 95%, and a ratio of an area of the second glue layer to an area of the second empty foil region is greater than 90%.
Referring to fig. 2, as shown in the figure, the electrode sheet of the present embodiment further includes a tab 40, and the tab 40 is disposed in the first empty foil area. In this case, since the adhesive layer 30 is not required to be disposed in the region where the tab 40 is welded to the current collector 10, the area of the first adhesive layer 31 accounts for 70% to 95% of the total area of the first empty foil region, and as a preferable mode, the area of the first adhesive layer 31 accounts for 85% to 95% of the total area of the first empty foil region.
In this case, the area of the second adhesive layer 32 occupies 80% or more of the total area of the second empty foil regions, and preferably, the area of the second adhesive layer 32 occupies 90% or more of the total area of the second empty foil regions, and preferably, the area of the second adhesive layer 32 occupies 100% of the total area of the second empty foil regions.
Optionally, the electrode plate further comprises a tab 40 arranged in a coating area, wherein the tab 40 is connected with the current collector 10, and the coating area is an area where the active material layer 20 is arranged on the surface of the current collector 10; the ratio of the area of the first glue layer 31 to the area of the first empty foil region is greater than 80%, and the ratio of the area of the second glue layer 32 to the area of the second empty foil region is greater than 80%.
Optionally, a ratio of an area of the first glue layer to an area of the first empty foil region is greater than 90%, and a ratio of an area of the second glue layer to an area of the second empty foil region is greater than 90%.
Referring to fig. 3, as shown, in one case, the tab 40 is disposed in the electrode sheet, it should be understood that when the active material layer 20 is provided with a groove exposing the current collector 10, and the tab 40 is welded in the groove and connected with the current collector 10, the tab 40 is disposed in the electrode sheet. Alternatively, tab 40 is integral with current collector 10, and tab 40 protrudes from the main portion of current collector 10, it being understood that the main portion of current collector 10 is the remainder of current collector 10 except for the head and tail portions of current collector 10.
In both cases, the area of the first glue layer 31 is set to account for more than 80% of the total area of the first empty foil regions, and the area of the second glue layer 32 is set to account for more than 80% of the total area of the second empty foil regions. In a preferred embodiment, the area of the first adhesive layer 31 is greater than or equal to 90% of the total area of the first empty foil regions, and the area of the second adhesive layer 32 is greater than or equal to 90% of the total area of the second empty foil regions. In another preferred embodiment, the first glue layer 31 is provided in an area of 100% of the total area of the first empty foil areas and the second glue layer 32 is provided in an area of 100% of the total area of the second empty foil areas.
An embodiment of the present invention further provides a battery, where the battery includes the electrode sheet, and the structure of the electrode sheet may refer to the above embodiment, and details are not repeated herein, and the battery includes an encapsulation shell and a winding battery cell, where the winding battery cell is formed by winding a first electrode sheet, a diaphragm, and a second electrode sheet after being stacked, the first electrode sheet is the electrode sheet, and in the winding battery cell, a glue layer is located inside the winding battery cell.
The winding battery core of the battery is formed by at least laminating and winding a first pole piece, a diaphragm and a second pole piece, and the diaphragm is arranged between the first pole piece and the second pole piece of the winding battery core. The structure of the first electrode sheet can refer to the above examples, and a preferred embodiment is that the structure of the negative electrode sheet of the battery is identical to the structure of the electrode sheet in the above examples.
In the case where the tab in the electrode sheet is welded in the first empty foil region, the area of the first adhesive layer is set to 70% to 95% of the total area of the first empty foil region, and as a preferable mode, the area of the first adhesive layer is set to 85% to 95% of the total area of the first empty foil region.
In this case, the area of the second adhesive layer may be set to account for 80% or more of the total area of the second empty foil regions, and as a preferable mode, the area of the second adhesive layer may be set to account for 90% or more of the total area of the second empty foil regions, and as another preferable mode, the area of the second adhesive layer may be set to account for 100% of the total area of the second empty foil regions.
In the pole ear of the electrode plate, or the pole ear and the current collector are integrated, and the pole ear is protruded from the main body of the current collector, the area of the first glue layer is more than 80% of the total area of the first hollow foil area, and the area of the second glue layer is more than 80% of the total area of the second hollow foil area. In a preferred embodiment, the area of the first adhesive layer is greater than 90% of the total area of the first foil region, and the area of the second adhesive layer is greater than 90% of the total area of the second foil region. In another preferred embodiment, the area of the first glue layer is arranged to account for 100% of the total area of the first empty foil regions and the area of the second glue layer is arranged to account for 100% of the total area of the second empty foil regions.
And after the winding of the winding core is finished, putting the winding core into a packaging bag, injecting electrolyte, and packaging the packaging bag to form the battery.
Since the electrode tabs in the above embodiments are used in this embodiment, the battery provided by the embodiment of the present invention has the same advantageous effects as those of the electrode tabs in the above embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electrode sheet, comprising:
a current collector;
an active material layer comprising a first active material layer disposed on a first surface of the current collector;
the glue film, the glue film is established the first empty foil area of mass flow body, first empty foil area does the mass flow body first surface does not be equipped with the region of first active substance layer, the glue film is including establishing the regional first glue film of first empty foil.
2. The electrode sheet according to claim 1, wherein the adhesive layer is a coating adhesive composed of a first compound, and the thickness of the coating adhesive is 1um to 10 um.
3. The electrode sheet according to claim 1, wherein the adhesive layer is a coating layer composed of a second compound, and the thickness of the coating layer is 1um to 5 um.
4. The electrode sheet of claim 1, wherein the active material layer comprises a second active material layer disposed on a second surface of the current collector;
the glue film still establishes the empty foil of second of mass flow body is regional, the empty foil of second is regional do the mass flow body second surface is not equipped with the region of second active substance layer, the glue film is including establishing the empty foil of second is regional second glue film.
5. The electrode sheet of claim 4, wherein the first and second empty foil regions are located at a head of the current collector.
6. The electrode sheet of claim 4, further comprising a tab disposed in the first empty foil region;
the ratio of the area of the first adhesive layer to the area of the first empty foil region is 70% to 95%, and the ratio of the area of the second adhesive layer to the area of the second empty foil region is greater than 80%.
7. The electrode sheet as claimed in claim 6, wherein the ratio of the area of the first glue layer to the area of the first empty foil region is 85% to 95%, and the ratio of the area of the second glue layer to the area of the second empty foil region is greater than 90%.
8. The electrode sheet according to claim 4, further comprising a tab arranged in a coating area, wherein the tab is connected with the current collector, and the coating area is an area where the active material layer is arranged on the surface of the current collector;
the ratio of the area of the first adhesive layer to the area of the first empty foil region is greater than 80%, and the ratio of the area of the second adhesive layer to the area of the second empty foil region is greater than 80%.
9. The electrode sheet of claim 8, wherein the ratio of the area of the first glue layer to the area of the first empty foil region is greater than 90%, and the ratio of the area of the second glue layer to the area of the second empty foil region is greater than 90%.
10. A battery comprising the electrode sheet of any one of claims 1-9, wherein the battery comprises an enclosure and a wound cell, wherein the wound cell is formed by stacking a first pole piece, a separator and a second pole piece and winding the stacked first pole pieces, the first pole piece being the electrode sheet, and wherein the adhesive layer is located inside the wound cell.
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| CN202011577515.XA CN112687840A (en) | 2020-12-28 | 2020-12-28 | Electrode sheet and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577515.XA CN112687840A (en) | 2020-12-28 | 2020-12-28 | Electrode sheet and battery |
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| CN112687840A true CN112687840A (en) | 2021-04-20 |
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| CN113193163A (en) * | 2021-04-28 | 2021-07-30 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| CN113193163B (en) * | 2021-04-28 | 2022-08-12 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| CN113707839A (en) * | 2021-08-02 | 2021-11-26 | 惠州锂威新能源科技有限公司 | Stripe pole piece, rolling process thereof and multi-pole-lug pole piece |
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