CN218299825U - Positive plate, roll core and battery - Google Patents
Positive plate, roll core and battery Download PDFInfo
- Publication number
- CN218299825U CN218299825U CN202222748788.7U CN202222748788U CN218299825U CN 218299825 U CN218299825 U CN 218299825U CN 202222748788 U CN202222748788 U CN 202222748788U CN 218299825 U CN218299825 U CN 218299825U
- Authority
- CN
- China
- Prior art keywords
- active material
- material layer
- current collector
- electrode sheet
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the application provides a positive plate, roll up core and battery, wherein, positive plate includes the mass flow body, and on the length direction of the mass flow body, the first active material layer and the second active material layer of having arranged on the first surface of mass flow body, the electric conductivity on first active material layer is less than the electric conductivity on second active material layer. Because the electric conductivity of the first active material layer is less than that of the second active material layer, when the electric core is of a roll core type structure, the position of the roll core, which is closer to the center, namely the rate of lithium release and insertion of the innermost 1-2 layers (such as a positive plate with the first active material layer) of the roll core is reduced, the occurrence of the lithium precipitation phenomenon is reduced, and the cycle life of the lithium ion battery is further prolonged.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a positive plate, a winding core and a battery.
Background
The lithium ion battery is a common failure cause of the battery, specifically, lithium ions shuttle back and forth between a positive electrode and a negative electrode in the charging and discharging process, however, when the lithium ions are extracted from the positive electrode, the lithium ions need to be inserted into the negative electrode, but when the vacancies which can be inserted into the positive electrode and the negative electrode are insufficient, or the insertion speed of one electrode is obviously delayed from the extraction speed of the lithium ions of the other electrode, the lithium ions are deposited and separated from the cycle process on the surface of the negative electrode or the surface of a diaphragm, that is, the lithium extraction phenomenon is caused. The lithium precipitation phenomenon not only can cause that lithium ions are separated from the charge-discharge cycle of the battery to reduce the capacity of the battery, but also can cause that the gradually growing lithium crystal branches can pierce a diaphragm to cause the short circuit of the battery. The lithium analysis region is a weak region in the process of battery safety test, so that the conditions of fire explosion and the like are easier to occur.
At present, a winding type battery cell structure is generally adopted by a small lithium ion battery, a battery roll core is closer to the center, namely, the innermost 1-2 layers of the roll core are rolled, and due to battery dynamics, the small lithium ion battery has relatively higher current density, so that the lithium ion moving speed of the area is fast, and the lithium ion battery is easy to separate, and further the cycle life of the lithium ion battery is influenced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a positive plate, roll up core and battery to solve because the battery rolls up the core and more is close to the position at center, and it is bigger relatively to roll up the innermost 1-2 layers of current density of core promptly, thereby it influences lithium ion battery's cycle life's problem to separate out the lithium phenomenon more seriously.
In a first aspect, an embodiment of the present application provides a positive electrode sheet, including a current collector, in a length direction of the current collector, a first active material layer and a second active material layer are arranged on a first surface of the current collector, and an electrical conductivity of the first active material layer is smaller than an electrical conductivity of the second active material layer.
Optionally, the first active material layer and the second active material layer do not overlap.
Optionally, the first active material layer and the second active material layer are arranged on the first surface of the current collector at intervals; alternatively, the first and second liquid crystal display panels may be,
the first active material layer and the second active material layer are continuously arranged on the first surface of the current collector.
Optionally, the first active material layer has a dimension from the first end that is less than or equal to 4% of the current collector length.
Optionally, in a length direction of the current collector, a size of the first active material layer is greater than 4% and less than 25% of the length of the current collector.
Optionally, in the length direction of the current collector, a third active material layer and a fourth active material layer are arranged on the second surface of the current collector, and the conductivity of the third active material layer is smaller than that of the fourth active material layer.
Optionally, the third active material layer and the fourth active material layer are arranged on the second surface of the current collector at intervals; alternatively, the first and second electrodes may be,
the third active material layer and the fourth active material layer are continuously arranged on the second surface of the current collector.
Optionally, the conductivity of the third active material layer is the same as the conductivity of the first active material layer;
the fourth active material layer has the same conductivity as the second active material layer.
Optionally, the conductivity of the first active material layer is less than 5% or more of the conductivity of the second active material layer;
the conductivity of the third active material layer is less than 5% or more of the conductivity of the fourth active material layer.
Optionally, in a case where the first active material layer and the second active material layer are disposed at an interval on the first surface of the current collector, and the interval distance between the first active material layer and the second active material layer is N1;
and/or;
in the case that the third active material layer and the fourth active material layer are arranged on the second surface of the current collector at intervals, the interval distance between the third active material layer and the fourth active material layer is N2;
and both N1 and N2 are more than or equal to the thickness of the coated positive plate and less than or equal to 15mm.
In a second aspect, an embodiment of the present application provides a winding core, which includes a negative electrode sheet, a separator, and a positive electrode sheet according to the first aspect, wherein the separator is disposed between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the separator and the negative electrode sheet are stacked and wound to form the winding core.
In a third aspect, the present application provides a battery, including the winding core according to the second aspect.
In this application embodiment, this positive plate includes the mass flow body, and in the length direction of the mass flow body, the first surface of mass flow body has arranged first active material layer and second active material layer, and the electric conductivity on first active material layer is less than the electric conductivity on second active material layer. Because the electric conductivity of the first active material layer is smaller than that of the second active material layer, when the electric core is of a roll core type structure, the rate of releasing and embedding lithium in an area (such as a positive plate with the first active material layer) close to the inner part of the roll core is reduced, the occurrence of a lithium precipitation phenomenon is reduced, and the cycle life of the lithium ion battery is further prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a first schematic structural diagram of a positive electrode plate provided in an embodiment of the present application;
fig. 2 is a second schematic structural diagram of a positive electrode plate provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram three of the positive electrode plate provided in the embodiment of the present application;
fig. 4 is a fourth schematic structural diagram of a positive electrode plate provided in the embodiment of the present application;
fig. 5 is a fifth schematic structural diagram of the positive electrode sheet provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein do not denote any order, quantity, or importance. But merely to distinguish between different components. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Fig. 1 to 5 are schematic structural diagrams of a positive plate according to an embodiment of the present disclosure. As shown in fig. 1, the positive electrode sheet includes a current collector 10, and a first active material layer 11 and a second active material layer 12 are sequentially arranged at a first end of a first surface of the current collector 10 in a longitudinal direction of the current collector 10, and an electrical conductivity of the first active material layer 11 is smaller than an electrical conductivity of the second active material layer 12.
The application is applicable to batteries with roll core type structures. The battery comprises a positive plate, a negative plate and a diaphragm, wherein the diaphragm is positioned between the positive plate and the negative plate, the positive plate, the diaphragm and the negative plate are stacked and wound to form a winding core.
It is to be understood that the first end is a winding start end of the current collector 10, the first active material layer 11 is a side close to the winding start end, and the second active material layer 12 is a side far from the winding start end.
It is to be understood that the conductivity of first active material layer 11 and second active material layer 12 can be detected in various ways, for example, the sheet resistance of the electrode sheet coated with first active material layer 11 and second active material layer 12 can be measured by a resistance meter, and the sheet resistance level can reflect the resistance magnitude of the electrode sheet in the area coated with first active material layer 11 and second active material layer 12, so that the conductivity of this area can be obtained by calculation. The resistance meter may be a three-probe resistance meter, a four-probe resistance meter, and the like, which is not limited in this embodiment. In addition, it should be noted that, after the pole pieces coated with the first active material layer 11 and the second active material layer 12 are subjected to the rolling process, the pole pieces should be tested in the same test environment by using the same parameters under the premise of meeting the use operation specifications of the resistance meter sample, so as to improve the measurement accuracy.
In the embodiment of the present application, the positive electrode sheet includes a current collector 10, a first active material layer 11 and a second active material layer 12 are arranged on a first surface of the current collector 10 in a length direction of the current collector 10, and the electrical conductivity of the first active material layer 11 is smaller than that of the second active material layer 12. Because the electric conductivity of the first active material layer 11 is less than that of the second active material layer 12, when the electric core is of a roll core type structure, the position of the roll core closer to the center, namely the rate of releasing and inserting lithium of the innermost 1-2 layers (such as the positive plate with the first active material layer 11) of the roll core is reduced, the occurrence of the lithium precipitation phenomenon is reduced, and the cycle life of the lithium ion battery is further prolonged.
It should be understood that the first surface of the current collector 10 may have a first exposed area, and the first exposed area, the first active material layer 11 and the second active material layer 12 may be sequentially arranged on the first surface of the current collector 10, and the tab may be disposed on the first exposed area, which may also be referred to as a tab slot. In some embodiments, the tab may be disposed in the first exposed area by welding.
In some alternative embodiments, a tab groove area may be provided on the first surface of the current collector 10 for receiving a tab, and a projection of the area of the tab groove is located in the area of the first active material layer 11 (not shown in the figure). Alternatively, the projection of the region of the tab slot may also be located in the region of the second active material layer 12 (not shown in the figures).
In specific implementation, both the first composition forming the first active material layer 11 and the second composition forming the second active material layer 12 may include an active material, a conductive agent, a binder, and an auxiliary additive. Wherein, the active substance can comprise at least one of lithium iron phosphate, lithium cobaltate, lithium manganate, ternary system, lithium titanate and other lithium transition metal oxides, and usually accounts for 60 to 99.8 percent of the total mass of the composition; the conductive agent can comprise at least one of various activated carbon, carbon nano tube, graphene, hollow graphene ball, carbon black, acetylene black, carbon fiber, ketjen black and the like, and generally accounts for 0.5-40% of the total mass of the composition; the binder may comprise at least one of polyvinylidene fluoride, styrene butadiene rubber, methyl cellulose phosphate, polytetrafluoroethylene, polyolefin, typically 0.5 to 40% by weight of the total composition; the auxiliary additive may include at least one of a dispersant, a flame retardant, a ceramic powder, a metal powder, a leveling agent, a defoaming agent, a lithium supplement, a filler, and the like, and generally accounts for 0 to 20% of the total mass in the composition. In order to make the conductivity of the first active material layer 11 smaller than that of the second active material layer 12, the substance constituting the first composition may be different in composition or content from the substance constituting the second composition.
In an alternative embodiment, in the case of the same active material component, at least one of the particle size of the active material or the crystal phase of the particles in the first composition or each component material of the composite active material is different from that in the second composition, while at least one of the composition or content of the other inactive materials (i.e., conductive agent, binder, auxiliary additive) is the same. For example: the first composition forming the first active material layer 11 uses 95% of an active material, the active material is lithium iron phosphate, and the second composition forming the second active material layer 12 also uses 95% by mass of lithium iron phosphate, but the particle size of the second composition is selected to be significantly smaller than that of the lithium iron phosphate material used in the first composition. Also for example: the first composition forming the first active material layer 11 used 95% of the composite active material, 90% of the active material was lithium iron phosphate, and 10% was a ternary system, while the second composition forming the second active material layer 12 used 95% of the composite active material, 80% of the active material was lithium iron phosphate, and 20% was a ternary system.
In another alternative embodiment, where the active material components are identical, the particle size of the active material or the crystalline phase of the particles or the component materials of the composite active material in the first composition are identical to the active material in the second composition, and at least one of the components or contents of the other inactive materials (i.e., conductive agent, binder, auxiliary additive) is different. For example: the first composition for forming the first active material layer 11 contains 95% of an active material, 2% of a conductive agent, 2% of a binder and 1% of an auxiliary additive, the active material is lithium iron phosphate, and the second composition for forming the second active material layer 12 uses 94% of lithium iron phosphate, 3% of a conductive agent, 2% of a binder and 1% of an auxiliary additive. Also for example: the first composition forming the first active material layer 11 contains 95% of an active material, 2% of a conductive agent, 2% of a binder, and 1% of an auxiliary additive, the active material being lithium iron phosphate, and the second composition forming the second active material layer 12 also uses 95% of an active material, 2% of a conductive agent, 2% of a binder, and 1% of an auxiliary additive, the active material being lithium iron phosphate, but the conductive agent in the first composition is entirely acetylene black powder, and the conductive agent in the second composition is a composite conductive agent of acetylene black powder and carbon nanotubes.
In this embodiment, by adjusting the mass percentage or the components of the substance forming the composition, the conductivity of the first composition can be smaller than the conductivity of the second composition, so that the conductivity of the formed first active material layer 11 is smaller than the conductivity of the second active material layer 12, and the transition deposition of lithium ions in the negative electrode sheet region corresponding to the first active material layer 11 region and the second active material layer 12 region of the positive electrode sheet, especially the position closer to the center of the winding core, i.e. the innermost 1-2 layers of the winding core, is avoided, and by reducing the lithium desorption rate of the positive electrode sheet, the difference of the lithium ion transmission rates between the positive electrode and the negative electrode is reduced, so that the occurrence of the lithium desorption phenomenon is reduced, and the cycle life of the lithium ion battery is further prolonged.
Alternatively, the electrical conductivity of first active material layer 11 is less than 5% or more of the electrical conductivity of second active material layer 12. In an alternative embodiment, the first active material layer 11 and the second active material layer 12 do not overlap.
It should be understood that the first active material layer 11 and the second active material layer 12 are disposed on the current collector 10 along the length direction, and are not overlapped or overlapped by a distance less than or equal to 5mm, so that the first active material layer 11 and the second active material layer 12 are independent of each other on the first surface of the current collector 10 and are not influenced by each other, and in addition, the surface of the formed positive electrode sheet can be more flat, thereby improving the quality of the electrode sheet.
In an alternative embodiment, as shown in fig. 2, the first active material layer 11 and the second active material layer 12 are disposed on the first surface of the current collector 10 at intervals. In a specific implementation, the spacing distance between the first active material layer 11 and the second active material layer 12 is N1, and N1 is equal to or greater than the thickness of the positive electrode sheet after coating and equal to or less than 15mm.
In another alternative embodiment, as shown in fig. 1, the first active material layer 11 and the second active material layer 12 are continuously disposed on the first surface of the current collector 10.
Alternatively, the size of the first active material layer 11 from the first end is less than or equal to 4% of the length of the current collector 10.
Alternatively, the size of the first active material layer 11 is greater than 4% and less than 25% of the length of the current collector 10 in the length direction of the current collector 10. In the present embodiment, the size of the first active material layer 11 in the longitudinal direction of the current collector 10 is set to be greater than 4% and less than 25% of the length of the current collector 10. The conductivity of the first active material layer 11 is smaller than that of the second active material layer 12, so that the first active material layer 11 with small conductivity has little influence on the energy density and the cell flatness of the battery, the cycle life of the battery is prolonged, and the safety performance of the battery is improved.
It should be noted that, because the current collector 10 further has a second surface, the second surface and the first surface are two surfaces oppositely disposed on the current collector 10, and the second surface is also provided with a bare region, and is also provided with an active material layer for battery capacity, a tab may be disposed in the first bare region of the first surface, may be disposed in a blank region in the first active material layer 11, may be disposed in a blank region in the second active material layer 12, and may also be disposed in the second bare region of the second surface, or may be disposed in a blank region (not shown in the figure) in the active material layer of the second surface, when the active material layer has the same conductivity as the second active material layer 12, when the battery core is of a roll core type structure, the position of the roll core closer to the center, that is, the rate of 1-2 layers of lithium deintercalation in the innermost portion of the roll core, is reduced, thereby reducing the occurrence of the lithium ion phenomenon, and further prolonging the cycle life of the lithium ion battery.
In an alternative embodiment, as shown in fig. 3 to 5, in the longitudinal direction of the current collector 10, a third active material layer 13 and a fourth active material layer 14 are sequentially arranged at the first end of the second surface of the current collector 10, and the conductivity of the third active material layer 13 is smaller than that of the fourth active material layer 14.
In this embodiment, the third active material layer 13 and the fourth active material layer 14 are sequentially arranged on the second surface of the current collector 10, and the electrical conductivity of the third active material layer 13 is smaller than that of the fourth active material layer 14, so that when the electric core is of a roll core type structure, the position closer to the center of the roll core is close to the position of the roll core, that is, the lithium releasing and embedding rate of the innermost 1-2 layers (such as the positive plate with the third active material layer 13) of the roll core is reduced, the occurrence of the lithium precipitation phenomenon is reduced, and the cycle life of the lithium ion battery is further prolonged.
In a specific implementation, the third active material layer 13 and the fourth active material layer 14 may be disposed at intervals on the second surface of the current collector 10. In a specific implementation, the spacing distance between the third active material layer 13 and the fourth active material layer 14 is N2, and N2 is equal to or greater than the thickness of the positive electrode sheet after coating and equal to or less than 15mm.
Alternatively, the third active material layer 13 and the fourth active material layer 14 are continuously disposed on the second surface of the current collector 10.
In an alternative embodiment, the second exposed region corresponds to the first exposed region of the first surface, the third active material layer 13 corresponds to the first active material layer 11 of the first surface, and the fourth active material layer 14 corresponds to the second active material layer 12 of the first surface.
In an alternative embodiment, the second exposed region corresponds to the first exposed region of the first surface, the third active material layer 13 corresponds to the first active material layer 11 of the first surface, and the size of the fourth active material layer 14 on the second surface is the same as or different from the size of the second active material layer 12 on the first surface.
Alternatively, the conductivity of the third active material layer 13 is the same as that of the first active material layer 11, and the conductivity of the fourth active material layer 14 is the same as that of the second active material layer 12, so that the first surface and the second surface of the current collector 10 have the same conductivity, the lithium deposition phenomenon in this region is reduced, the cycle life of the battery is extended, and the battery safety performance is improved.
Alternatively, the conductivity of the third active material layer 13 is less than 5% or more of the conductivity of the fourth active material layer 14.
The embodiment of the application further provides a roll core, which comprises a negative plate and a diaphragm, and further comprises the positive plate, wherein the diaphragm is arranged between the positive plate and the negative plate, and the roll core is formed by winding the positive plate, the diaphragm and the negative plate in a stacking mode. Since the technical solution of this embodiment includes all technical solutions of the above embodiments, at least all technical effects of the above embodiments can be achieved, and details are not repeated here.
The conductivity of the first active material layer is smaller than that of the second active material layer, wherein the first active material layer is close to the starting winding end, so that the position of the winding core close to the center is achieved, namely the rate of lithium release and intercalation of the innermost 1-2 layers of the winding core is reduced, the occurrence of the lithium precipitation phenomenon is reduced, and the cycle life of the lithium ion battery is prolonged.
The embodiment of the application also provides a battery, which comprises the winding core. Since the technical solution of this embodiment includes all technical solutions of the above embodiments, at least all technical effects of the above embodiments can be achieved, and details are not repeated here.
The above description is only for the specific embodiments of the present application, but the scope of the present application 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 application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. The utility model provides a positive plate, its characterized in that includes the mass flow body on the length direction of the mass flow body, first active material layer and second active material layer have been arranged in proper order to the first end on the first surface of the mass flow body, the electric conductivity on first active material layer is less than the electric conductivity on second active material layer.
2. The positive electrode sheet according to claim 1, wherein the first active material layer and the second active material layer do not overlap.
3. The positive electrode sheet according to claim 2, wherein the first active material layer and the second active material layer are provided at the first surface of the current collector at intervals; alternatively, the first and second electrodes may be,
the first active material layer and the second active material layer are continuously arranged on the first surface of the current collector.
4. The positive electrode sheet according to claim 1, wherein the first active material layer has a dimension from the first end of less than or equal to 4% of the length of the current collector.
5. The positive electrode sheet according to claim 4, wherein the size of the first active material layer in the longitudinal direction of the current collector is greater than 4% and less than 25% of the length of the current collector.
6. The positive electrode sheet according to claim 3, wherein a first end of the second surface of the current collector is provided with a third active material layer and a fourth active material layer in a longitudinal direction of the current collector, and an electrical conductivity of the third active material layer is smaller than an electrical conductivity of the fourth active material layer.
7. The positive electrode sheet according to claim 6, wherein the third active material layer and the fourth active material layer are provided on the second surface of the current collector at intervals; alternatively, the first and second electrodes may be,
the third active material layer and the fourth active material layer are continuously arranged on the second surface of the current collector.
8. The positive electrode sheet according to claim 6, wherein the conductivity of the third active material layer is the same as the conductivity of the first active material layer;
the fourth active material layer has the same conductivity as the second active material layer.
9. The positive electrode sheet according to claim 6, wherein the electrical conductivity of the first active material layer is less than 5% or more of the electrical conductivity of the second active material layer;
the conductivity of the third active material layer is less than 5% or more of the conductivity of the fourth active material layer.
10. The positive electrode sheet according to claim 6, wherein in a case where the first active material layer and the second active material layer are provided at an interval on the first surface of the current collector, and the interval distance between the first active material layer and the second active material layer is N1;
and/or;
in the case that the third active material layer and the fourth active material layer are arranged on the second surface of the current collector at intervals, the interval distance between the third active material layer and the fourth active material layer is N2;
and both N1 and N2 are more than or equal to the thickness of the coated positive plate and less than or equal to 15mm.
11. A winding core, characterized by comprising a negative electrode sheet and a separator, and further comprising a positive electrode sheet according to any one of claims 1 to 10, wherein the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the separator and the negative electrode sheet are arranged in a stacked manner and wound to form the winding core.
12. A battery comprising the jellyroll of claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222748788.7U CN218299825U (en) | 2022-10-17 | 2022-10-17 | Positive plate, roll core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222748788.7U CN218299825U (en) | 2022-10-17 | 2022-10-17 | Positive plate, roll core and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218299825U true CN218299825U (en) | 2023-01-13 |
Family
ID=84807091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222748788.7U Active CN218299825U (en) | 2022-10-17 | 2022-10-17 | Positive plate, roll core and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218299825U (en) |
-
2022
- 2022-10-17 CN CN202222748788.7U patent/CN218299825U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022116588A1 (en) | Lithium-supplementing negative electrode piece, preparation method therefor and lithium ion battery | |
| WO2021223655A1 (en) | Positive electrode plate, preparation method therefor, and lithium ion battery comprising same | |
| CN103367712B (en) | The preparation method of a kind of lithium ion battery coating pole piece | |
| CN111969214A (en) | Positive plate with special-shaped structure and lithium ion battery comprising same | |
| CN101699590B (en) | Hybrid supercapacitor | |
| CN111540880B (en) | Negative plate, preparation method and lithium ion battery comprising negative plate | |
| CN111554878B (en) | Positive plate, preparation method and lithium ion battery comprising positive plate | |
| CN113488637B (en) | Composite negative electrode material, negative plate and lithium ion battery | |
| CN102956895A (en) | Surface composite coated anode material, preparation method thereof and lithium ion battery | |
| CN112582583A (en) | Preparation method of quick-charging type lithium ion battery pole piece, pole piece and lithium ion battery | |
| CN109599524B (en) | Ion selective composite diaphragm and preparation method and application thereof | |
| CN112290080A (en) | Lithium ion battery capable of being charged at low temperature | |
| Liu et al. | Analysis of the relationship between vertical imparity distribution of conductive additive and electrochemical behaviors in lithium ion batteries | |
| US20190097198A1 (en) | Separator for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery | |
| CN115810718A (en) | Negative pole piece and secondary battery comprising same | |
| CN114050231A (en) | Negative plate and lithium ion battery | |
| CN115458707A (en) | Secondary battery and electric equipment | |
| CN114204038A (en) | Current collector and application thereof | |
| CN114242932A (en) | Lithium ion battery | |
| CN114050233A (en) | Negative pole piece and battery | |
| CN220382154U (en) | Secondary battery and electronic device | |
| CN218299825U (en) | Positive plate, roll core and battery | |
| CN112151757A (en) | Negative plate with multilayer film structure and mixed solid-liquid electrolyte lithium storage battery thereof | |
| CN116014361A (en) | Lithium battery diaphragm, lithium battery and preparation method | |
| CN115632158A (en) | Secondary battery and power consumption device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |