CN112786897A - Current collector, pole piece, battery and manufacturing method of pole piece - Google Patents

Current collector, pole piece, battery and manufacturing method of pole piece Download PDF

Info

Publication number
CN112786897A
CN112786897A CN202110277667.6A CN202110277667A CN112786897A CN 112786897 A CN112786897 A CN 112786897A CN 202110277667 A CN202110277667 A CN 202110277667A CN 112786897 A CN112786897 A CN 112786897A
Authority
CN
China
Prior art keywords
layer
current collector
pole piece
bending
bent
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.)
Pending
Application number
CN202110277667.6A
Other languages
Chinese (zh)
Inventor
吴颖
王磊
姜倩荣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hubei Eve Power Co Ltd
Original Assignee
Hubei Eve Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hubei Eve Power Co Ltd filed Critical Hubei Eve Power Co Ltd
Priority to CN202110277667.6A priority Critical patent/CN112786897A/en
Publication of CN112786897A publication Critical patent/CN112786897A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

The invention relates to the technical field of power batteries, and discloses a current collector, a pole piece, a battery and a manufacturing method of the pole piece. The mass flow body includes the mass flow base member, and the mass flow base member includes polymer layer and metal level, and the metal level setting is in polymer layer both sides, and the mass flow base member is bent the shaping and is noumenon portion and the portion of bending, bends the portion and is less than 90 with the contained angle between the noumenon portion. The current collecting matrix consists of a polymer layer and a metal layer, is light in weight and can improve the energy density of the battery; the metal level of the current collector both sides of being convenient for all is connected with external terminal electricity in the setting up of the portion of bending, simple structure, with low costs, convenient operation, efficient. The pole piece is convenient to manufacture by arranging the current collector, and the energy density of the battery can be improved. The battery of the invention has high energy density, simple structure and low cost by arranging the current collector. The pole piece manufactured by the method for manufacturing the pole piece is light in weight and is convenient to be electrically connected with other parts.

Description

Current collector, pole piece, battery and manufacturing method of pole piece
Technical Field
The invention relates to the technical field of power batteries, in particular to a current collector, a pole piece, a battery and a manufacturing method of the pole piece.
Background
The lithium ion battery has the characteristics of high energy density, long cycle life, no memory effect and the like, and is widely applied to the fields of 3C electronic products, energy storage, electric automobiles and the like. With the wide application of lithium batteries, people put higher demands on the energy density of lithium batteries.
The current collectors of the current lithium ion batteries are aluminum foils (anodes) and copper foils (cathodes), account for about 8% of the weight of the batteries, and are influenced by the upstream aluminum foil and copper foil processing technology, so that the thickness of the current collectors reaches the limit slowly and cannot meet the further requirements of weight reduction of the batteries. Among the prior art, there is a mass flow body, including the PET layer (Polyethylene terephthalate, thermoplastic polyester), the both sides on PET layer are plated respectively and are equipped with the metal level, the whole weight of this kind of mass flow body is lighter, can improve the energy density of battery, but in the power battery production, need be in the same place battery mass flow body and outer terminal welding, and this mass flow body is because the middle PET layer that has the nonconducting, it can realize the electricity with outer terminal to be difficult to guarantee that the both sides metal level of mass flow body all can be connected, when welding mass flow body and outer terminal promptly, there is very big difficulty. In order to solve the problem, patent CN108336357A discloses an ultra-light lithium ion battery current collector and a preparation method thereof, in which a U-shaped metal sheet is arranged at the edge of the current collector, and the metal layers on two sides of a PET layer are electrically connected through the U-shaped metal sheet, so as to solve the problem of difficulty in welding the current collector and an outer terminal. However, the current collector has a very thin thickness, so that the U-shaped metal sheet with a proper size is difficult to process, and the steps of connecting the U-shaped metal sheet with the metals on the two sides of the PET layer are complicated, which results in high production cost and low production efficiency of the current collector.
Therefore, a current collector, a pole piece, a battery and a method for manufacturing the pole piece are needed to solve the above technical problems.
Disclosure of Invention
The first purpose of the present invention is to provide a current collector which has a small overall mass, a simple structure, a convenient processing, a low cost, and is convenient for realizing electrical connection with other components.
The second objective of the present invention is to provide a pole piece, which is convenient to process and can improve the energy density of the battery by providing the current collector.
The third objective of the present invention is to provide a battery, which is convenient to assemble, high in efficiency and high in energy density by providing the above-mentioned pole piece.
The fourth purpose of the invention is to provide a manufacturing method of the pole piece, and the pole piece manufactured by the method is light in weight and convenient to be electrically connected with other components.
In order to achieve the purpose, the invention adopts the following technical scheme:
a current collector comprises a current collecting base body, wherein the current collecting base body comprises a polymer layer and metal layers, the metal layers are arranged on two sides of the polymer layer, the current collecting base body is bent to form a body portion and a bending portion, and an included angle between the bending portion and the body portion is smaller than 90 degrees.
Optionally, the bending portion includes:
a first bending part having one end connected to the body part;
and the second bending part is formed by bending one end of the first bending part, which is far away from the body part, and the second bending part is clamped between the first bending part and the body part.
Optionally, the bending portion is attached to the main body portion and is connected to the main body portion in an adhering manner.
Optionally, the metal layer is a copper layer or an aluminum layer.
Optionally, said polymer layer is extruded from PET and/or PP and/or PVC and/or PP and/or PEN and/or PA.
Optionally, the thickness of the polymer layer is 3.5-4.5 μm; the thickness of the metal layer is 1-2 μm.
A pole piece comprises the current collector, wherein a slurry layer is formed by locally coating one side of the body part, which is far away from the bent part; or the two sides of the body part are partially coated with slurry layers.
A battery comprises the pole piece.
A manufacturing method of a pole piece comprises the following steps:
plating metal layers on two sides of the polymer layer to form a current collecting matrix;
and bending the edge of the current collecting base body to enable the current collecting base body to form a body part and a bending part, wherein the included angle between the bending part and the body part is less than 90 degrees.
Optionally, the manufacturing method of the pole piece further includes:
manufacturing a material belt, and coating a slurry layer on a preset area on one side of the material belt; die-cutting a material belt into a flow collecting matrix, wherein the slurry layer covers the local position of the torrent matrix; bending the part of the current collecting substrate, which does not cover the slurry layer area, towards one side away from the slurry layer to form the body part and the bent part; or
And coating a slurry layer on one side of the main body part, which is far away from the bending part.
The current collecting matrix of the current collector consists of the polymer layer and the metal layer, so that the weight of the current collector is reduced, and the energy density of a battery is improved; the setting of the portion of bending makes the metal level that deviates from portion one side of bending at least part lie in same one side of this somatic part with the metal level that is close to the portion of bending to when welding the mass flow body with external terminal or other structures, be convenient for realize the metal level of mass flow body both sides all is connected with the external terminal electricity, and simple structure, shaping convenience, with low costs, convenient operation, efficient.
The pole piece is convenient to manufacture by arranging the current collector, and the energy density of the battery can be improved.
The battery provided by the invention has the advantages that the pole piece is arranged, the energy density is high, the structure is simple, the cost is low, the operation of electrically connecting the external terminal and the current collector is convenient, and the efficiency is high.
The pole piece manufactured by the manufacturing method of the pole piece is light in weight and is convenient to be electrically connected with other parts.
Drawings
Fig. 1 is a front view of a current collecting substrate according to an embodiment of the present invention;
fig. 2 is a side view of a current collecting substrate according to one embodiment of the present invention;
fig. 3 is a front view of a current collector provided in accordance with a first embodiment of the present invention;
fig. 4 is a side view of a first current collector provided in accordance with a first embodiment of the present invention;
fig. 5 is a side view of a second current collector provided in accordance with a first embodiment of the present invention;
FIG. 6 is a side view of a first electrode plate according to an embodiment of the present invention;
FIG. 7 is a side view of a second pole piece according to one embodiment of the present invention;
fig. 8 is a front view of a current collecting substrate provided in accordance with a second embodiment of the present invention;
fig. 9 is a side view of a second embodiment of the invention providing a current collecting substrate with one side completely coated with a slurry;
fig. 10 is a side view of a second embodiment of the present invention after removal of slurry at the edge of the current collecting substrate;
FIG. 11 is a front view of a pole piece provided in accordance with a second embodiment of the present invention;
fig. 12 is a sectional view a-a in fig. 11.
In the figure:
1-a current collecting matrix; 11-a polymer layer; 12-a metal layer;
21-a body portion; 22-bending part; 221-a first bend; 222-a second bend;
3-slurry layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
The embodiment provides a mass flow body, pole piece and battery, and the battery includes the pole piece, and the pole piece includes the mass flow body and the coating at the thick liquids layer of mass flow body one side. In this embodiment, the battery is a pouch battery, and the current collector is a current collector of a pouch battery as an example, the current collector includes a current collecting base body 1, as shown in fig. 1, when viewed from the appearance, the current collecting base body 1 includes a body region and a tab region protruding from the body region, where the body region, the tab region and one end connected to the body region belong to a body portion 21, and the end of the tab region far from the body region belongs to a bent portion 22, as shown in fig. 1 to 5, the current collecting base body 1 includes a polymer layer 11 and a metal layer 12, the metal layer 12 is disposed on two sides of the polymer layer 11, the current collecting base body 1 is bent to form the body portion 21 and the bent portion 22, and an included angle between the bent portion 22 and.
The current collecting substrate 1 of the embodiment is composed of the polymer layer 11 and the metal layer 12, so that the weight of the current collector is reduced, and the energy density of the battery is improved; the metal layer 12 that the setting of portion of bending 22 made and deviates from portion of bending 22 one side is located same one side of this somatic part 21 with the metal layer 12 that is close to portion of bending 22 at least partially to when welding current collector and external terminal (or other adjacent structure), be convenient for realize the metal layer 12 of current collector both sides all is connected with external terminal (or other adjacent structure) electricity, and simple structure, with low costs, convenient operation, efficient. The pole piece of this embodiment is through setting up foretell mass flow body, through adopting foretell mass flow body, and the quality is light, the preparation is convenient, is convenient for be connected with other structures. The battery of this embodiment is through setting up foretell pole piece, and energy density is high, simple structure, with low costs, and realizes convenient operation, efficient that external terminal (or other adjacent structures) and mass flow body electricity are connected.
The term "the angle between the bent portion 22 and the main body portion 21" refers to the relative angle between the plane in which the bent portion 22 extends and the plane in which the main body portion 21 extends after the bending molding. It should be understood that, under the influence of the angle at which the current collecting substrate 1 is bent during the bending process, the actual shape of the bending portion (i.e., the connection portion) of the bending portion 22 and the main body portion 21 may be a standard angle, an arc (shown in fig. 4), a pi shape, or the like. When the bending part is arc-shaped, the included angle can be understood as the relative included angle between the extending direction of the main body part 21 and the extending direction of the bending part 22; when the bending position is n-shaped, the included angle is understood to be the included angle between the bending portion 22 at both sides of the n-shape and the extending direction of the main body portion 21. It should be understood that they are all intended to be encompassed by the present application.
In this embodiment, the polymer layer 11 may be formed by extrusion of one or more of PET, PP, PVC, PP, PEN, and PA, and is easy to form, light in weight, and low in cost.
Optionally, the metal layer 12 is a copper layer or an aluminum layer. When the metal layer 12 is a copper layer, the current collector is used for manufacturing a negative electrode plate of the battery, and when the metal layer 12 is an aluminum layer, the current collector can be used for manufacturing a positive electrode plate of the battery. Preferably, the metal layer 12 is formed on the polymer layer 11 by an evaporation process, so as to ensure that the metal layer 12 is uniformly distributed and has a small thickness, so as to further improve the energy density of the battery. The specific steps and parameters of the evaporation process are not described herein.
Preferably, the thickness of the polymer layer 11 is 3.5 to 4.5 μm, and the thickness of the metal layer 12 is 1 to 2 μm. The thickness of the whole current collector is thin, the weight is light, and the energy density of the battery is further improved. Of course, the thicknesses of the polymer layer 11 and the metal layer 12 are not limited thereto.
Preferably, the included angle between the bending portion 22 and the body portion 21 is smaller than 45 °, the forming is convenient, and the bending portion 22 is prevented from tilting the body portion 21 too high to affect the subsequent manufacturing steps of the current collector. In this embodiment, as shown in fig. 4, an included angle between the bent portion 22 and the main body portion 21 is 0 °, that is, the bent portion 22 and the main body portion 21 are attached to each other, so that the structure of the whole current collector is relatively flat, and convenience in welding the current collector and an external terminal (or other adjacent structures) is further improved.
In another embodiment, as shown in fig. 5, the bending portion 22 includes a first bending portion 221 and a second bending portion 222, one end of the first bending portion 221 is connected to the main body portion 21, the second bending portion 222 is formed by bending the first bending portion 221 at an end away from the main body portion 21, and the second bending portion 222 is interposed between the first bending portion 221 and the main body portion 21, so that an end surface of the non-conductive polymer layer 11 is wound between the first bending portion 221 and the main body portion 21, and therefore reliability of electrical connection between the current collector and the external terminal (or other adjacent structures) can be improved. In another embodiment, the specific structure of the bending portion 22 is not limited, as long as it is ensured that the metal layer 12 on the side away from the bending portion 22 is at least partially bent to the same side of the main body portion 21 as the metal layer 12 close to the bending portion 22. Optionally, the width of the bent portion 22 may be set between 2mm and 27mm, and the specific width may be set according to the overall size of the current collector, which is not specifically limited herein.
Furthermore, the bending portion 22 is attached to the body portion 21 and is bonded to the body portion, so that the bending portion 22 is prevented from being warped or rebounded after bonding, the reliability of the bending structure is ensured, and the convenience in welding the current collector and the external terminal is further improved. Alternatively, the bent portion 22 and the body portion 21 may be bonded by a nylon-based adhesive. It should be noted that, when the bending portion 22 includes the first bending portion 221 and the second bending portion 222, in an embodiment, the adhesive is only disposed between the main body portion 21 and a side of the second bending portion 222 facing the main body portion 21, so as to ensure that the whole bending portion 22 does not tilt or rebound. In another embodiment, the adhesive is disposed between the first bending portion 221 and the second bending portion 222 and on the side of the main body 21 and the second bending portion 222 facing the main body 21, so that the whole bending portion 22 can be attached to the main body 21, and the structure of the bending portion 22 itself can be made compact.
Preferably, the pole piece includes a current collector, and in one embodiment, as shown in fig. 6, when the bending portion 22 is directly attached to the main body portion 21, a side of the main body portion 21 of the current collector facing away from the bending portion 22 is partially coated with the slurry layer 3. The slurry layer 3 can play a role in improving the reaction depth and the utilization rate of the current collecting substrate 1, and the local slurry coating layer 3 enables the metal layer 12 with a partial area on one side of the body part 21 departing from the bending part 22 to be in an exposed state, so that one side of the pole piece departing from the bending part 22 is conveniently electrically connected with other structures (such as another current collector). In another embodiment, as shown in fig. 7, when the bending portion 22 includes the first bending portion 221 and the second bending portion 222, both sides of the body portion 21 of the current collector may be partially coated with the slurry layer 3. When the second bending portion 222 is sandwiched between the first bending portion 221 and the main body portion 21, the metal layers 12 on both sides of the polymer layer 11 are in conduction with each other, and when a plurality of pole pieces are stacked, the metal layers 12 on both sides can transmit electrons, so that the energy density of the battery can be improved. When the metal layer 12 is a copper layer, the paste layer 3 applied to the main body portion 21 is a negative electrode paste to form a negative electrode sheet. If the metal layer 12 is an aluminum layer, the paste layer 3 applied to the main body 21 is a positive paste to form a positive electrode sheet. The specific components of the positive electrode slurry and the negative electrode slurry are not particularly limited, as long as they can be obtained by the prior art.
The embodiment also provides a manufacturing method of the pole piece, which comprises the following steps:
plating metal layers 12 on two sides of the high polymer layer 11 to form a current collecting base body 1;
the edge of the current collecting base body 1 is bent to enable the current collecting base body 1 to form a body part 21 and a bent part 22, and the included angle between the bent part 22 and the body part 21 is smaller than 90 degrees.
The pole piece manufactured by the manufacturing method of the pole piece is light in weight and convenient to manufacture, and is convenient to electrically connect with an external terminal or other adjacent structures.
Specifically, the manufacturing method of the pole piece comprises the following steps:
manufacturing a material belt, wherein the material belt comprises a polymer layer 11, and metal layers 12 are plated on two sides of the polymer layer 11;
coating a slurry layer 3, wherein the slurry layer 3 is coated in a preset area on one side of the material belt;
die cutting, namely die cutting is carried out on the material belt to form the shape of the current collecting base body 1 shown in fig. 1, and the slurry layer 3 is ensured to cover only the body area of the current collecting base body 1; (the tab region is not coated with the slurry layer 3 to ensure that the side of the pole piece away from the bending part 22 can be electrically connected with other structures such as adjacent pole pieces);
and (3) bending, namely bending the bent part 22 of the current collecting substrate 1 to one side away from the slurry layer 3, so that the bent part 22 is attached to the body part 21 to form the pole piece.
In other embodiments, if mass production of the pole pieces is not required, the pole pieces can be formed by partially coating the paste layer 3 on the side of the body portion 21 facing away from the bent portion 22 after the current collecting substrate 1 is bent (in this manner, the tab region still does not need to be coated with the paste layer 3).
Example two
The present embodiment has the same inventive concept as the first embodiment, but the difference is that:
as shown in fig. 8-11, the pole pieces are circular, which can be used in button cells.
The manufacturing method of the pole piece of the embodiment comprises the following steps:
manufacturing a material belt, wherein the material belt comprises a polymer layer 11, and metal layers 12 are plated on two sides of the polymer layer 11;
coating slurry on the whole area of one side of the material belt, (improving the convenience of operation);
punching, as shown in fig. 8 and 9, a circular current collecting base 1 is punched and cut from a material strip;
tabletting, as shown in fig. 10, tabletting the current collecting substrate 1 to remove the slurry at the edge of the current collecting substrate 1 to form a slurry layer 3; (at this time, the circular area in the middle of one side of the current collecting base body 1 is coated with the slurry layer 3, the annular area close to the edge is not coated with the slurry, and the area of the slurry-uncoated area is larger than that of the bending part 22);
as shown in fig. 11 and 12, the region of the current collecting substrate 1 not coated with the paste layer 3 is partially bent toward the side away from the paste layer 3 to form a bent portion 22 and a main body portion 21, and the pole piece is formed. (at this point, the side of the pole piece facing away from the bend 22 still remains the area of the partially uncoated paste layer 3, i.e., the metal layer 12 is still partially exposed for electrical connection with other structures, such as adjacent pole pieces.)
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the invention and are not to be construed as limitations of the embodiments of the present invention, but may be modified in various embodiments and applications by those skilled in the art according to the spirit of the present invention, and the content of the present description should not be construed as a limitation of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The current collector is characterized by comprising a current collecting base body (1), wherein the current collecting base body (1) comprises a polymer layer (11) and a metal layer (12), the metal layer (12) is arranged on two sides of the polymer layer (11), the current collecting base body (1) is bent to form a body part (21) and a bent part (22), and an included angle between the bent part (22) and the body part (21) is smaller than 90 degrees.
2. The current collector of claim 1, wherein the bent portion (22) comprises:
a first bent portion (221) having one end connected to the main body portion (21);
and a second bending portion (222) formed by bending one end of the first bending portion (221) away from the main body portion (21), wherein the second bending portion (222) is interposed between the first bending portion (221) and the main body portion (21).
3. The current collector of claim 1, wherein the bent portion (22) is attached to the body portion (21) and adhesively connected thereto.
4. The current collector of any of claims 1 to 3, wherein the metal layer (12) is a copper or aluminum layer.
5. The current collector of any of claims 1 to 3, wherein said macromolecular layer (11) is extruded from PET and/or PP and/or PVC and/or PP and/or PEN and/or PA.
6. The current collector of any of claims 1 to 3, wherein the thickness of the polymer layer (11) is from 3.5 to 4.5 μm; the thickness of the metal layer (12) is 1-2 μm.
7. A pole piece, characterized in that it comprises a current collector according to any one of claims 1 to 6, the side of the body portion (21) facing away from the bent portion (22) being locally coated with a layer of paste (3); or both sides of the body part (21) are partially coated with slurry layers (3).
8. A battery comprising the pole piece of claim 7.
9. A manufacturing method of a pole piece is characterized by comprising the following steps:
plating metal layers (12) on two sides of the polymer layer (11) to form a current collecting base body (1);
the edge of the current collecting base body (1) is bent, so that the current collecting base body (1) forms a body part (21) and a bent part (22), and the included angle between the bent part (22) and the body part (21) is smaller than 90 degrees.
10. The method of claim 9, further comprising:
manufacturing a material belt, and coating a slurry layer (3) in a preset area on one side of the material belt; the method comprises the following steps of die-cutting a material belt into a flow collecting base body (1), wherein a slurry layer (3) covers a local position of the flow collecting base body (1); bending the part of the current collecting substrate (1) which is not covered with the slurry layer (3) towards the side away from the slurry layer (3) to form the body part (21) and the bent part (22); or
And a slurry layer (3) is locally coated on one side of the main body part (21) departing from the bending part (22).
CN202110277667.6A 2021-03-15 2021-03-15 Current collector, pole piece, battery and manufacturing method of pole piece Pending CN112786897A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110277667.6A CN112786897A (en) 2021-03-15 2021-03-15 Current collector, pole piece, battery and manufacturing method of pole piece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110277667.6A CN112786897A (en) 2021-03-15 2021-03-15 Current collector, pole piece, battery and manufacturing method of pole piece

Publications (1)

Publication Number Publication Date
CN112786897A true CN112786897A (en) 2021-05-11

Family

ID=75762661

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110277667.6A Pending CN112786897A (en) 2021-03-15 2021-03-15 Current collector, pole piece, battery and manufacturing method of pole piece

Country Status (1)

Country Link
CN (1) CN112786897A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023123500A1 (en) * 2021-12-31 2023-07-06 东莞新能源科技有限公司 Battery and electronic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023123500A1 (en) * 2021-12-31 2023-07-06 东莞新能源科技有限公司 Battery and electronic device

Similar Documents

Publication Publication Date Title
JP2020109762A5 (en)
US12095097B2 (en) Current collector for electrode
EP2602846B1 (en) Electrode terminal for secondary battery and lithium secondary battery comprising same
CN112400244A (en) Collector for electrode
CN112259742B (en) Composite base material, preparation method thereof, battery and electric vehicle
WO2021149644A1 (en) Secondary battery and manufacturing method for same
CN113708018B (en) Welding structure and welding method for composite current collector tab and battery
JP2006269288A (en) Thin battery
WO2019073914A1 (en) Secondary battery and method for manufacturing secondary battery
US20060154142A1 (en) New-type Ni-MH power battery
CN114361385B (en) Battery and electronic equipment
CN112786897A (en) Current collector, pole piece, battery and manufacturing method of pole piece
US20040185332A1 (en) Tabs for electrochemical cells
CN214505546U (en) Current collector, pole piece and battery
CN116826066A (en) Composite current collector tab and preparation method and application thereof
JP7548303B2 (en) Secondary battery
WO2022085682A1 (en) Secondary battery
JP2020173923A (en) Secondary battery and manufacturing method thereof
US11764445B2 (en) Battery and battery production method
CN221407570U (en) Battery connection piece, group battery and vehicle
CN219779156U (en) Composite current collector tab connection structure
CN218918948U (en) Battery cell
CN218731327U (en) Easy-to-assemble button cell
WO2019073916A1 (en) Secondary battery and method for manufacturing secondary battery
CN221102131U (en) Composite conductive foil, electrode plate and battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination