CN215644564U

CN215644564U - Pole piece assembly, battery and electronic equipment

Info

Publication number: CN215644564U
Application number: CN202122024158.0U
Authority: CN
Inventors: 陈志勇
Original assignee: Guangdong Mic Power New Energy Co Ltd
Current assignee: Guangdong Mic Power New Energy Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-01-25
Anticipated expiration: 2031-08-25

Abstract

The disclosed embodiment provides a pole piece assembly, a battery and electronic equipment, which comprises a positive pole piece, wherein the positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer and the positive current collector are arranged in a stacked manner; the negative pole piece comprises a negative current collector and a negative active material layer, and the negative active material layer and the negative current collector are stacked; the support body is of a sheet structure, the positive current collector is formed on one surface of the support body, the negative current collector is formed on the surface of the support body opposite to the positive current collector, and the positive pole piece, the negative pole piece and the support body form an integrated structure.

Description

Pole piece assembly, battery and electronic equipment

Technical Field

The disclosed embodiments relate to lithium ion batteries, and more particularly, to a pole piece assembly, a battery, and an electronic device.

Background

With the widespread use of secondary batteries, particularly lithium ion secondary batteries are widely used in various fields because of their superior performance.

Currently, a lithium ion battery includes a separator, a positive electrode sheet, a negative electrode sheet, and an electrolyte. In general, an active material layer is coated on a metal current collector to form a positive electrode sheet and a negative electrode sheet. And then the positive pole piece, the negative pole piece and the diaphragm are laminated and then wound or stacked to form the battery cell.

However, when the battery is wound in this way, the positive electrode sheet and the negative electrode sheet are often dislocated or deviated, which seriously affects the performance of the battery.

Disclosure of Invention

An object of the present disclosure is to provide a new technical solution for a pole piece assembly, a battery and an electronic device.

The embodiment of the disclosure provides a pole piece assembly, which comprises a positive pole piece, wherein the positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer and the positive current collector are arranged in a stacked manner; the negative pole piece comprises a negative current collector and a negative active material layer, and the negative active material layer and the negative current collector are stacked; the support body is of a sheet structure, the positive current collector is formed on one surface of the support body, the negative current collector is formed on the surface of the support body opposite to the positive current collector, and the positive pole piece, the negative pole piece and the support body form an integrated structure.

Optionally, the positive electrode current collector and the negative electrode current collector are respectively formed on two opposite surfaces of the support body by electroplating.

Optionally, the width of the negative electrode current collector is greater than the width of the positive electrode current collector.

Optionally, the positive electrode current collector and the negative electrode current collector are metal.

Alternatively, the positive electrode active material layer is a lithium ion compound, and the negative electrode active material layer is a carbon-based compound.

Optionally, the support is a resin.

In another aspect, a battery is provided that includes a separator and a pole piece assembly, the separator covering the positive electrode active material layer or the negative electrode active material layer.

Optionally, the membrane forms a unitary structure with the pole piece assembly.

Optionally, the battery comprises a cell, and the pole piece assembly is stacked or wound to form the cell.

An electronic device is also provided that includes a battery.

The beneficial effects of this disclosed embodiment lie in, through forming integrative pole piece subassembly, avoided coiling or pile up the in-process that forms electric core, the drawback that can't align and misplace takes place easily with single negative pole piece for single positive pole piece, is favorable to the improvement of the stability of battery.

Other features of the present description and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

Fig. 1 is a schematic structural diagram of a pole piece assembly in an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a battery portion in an embodiment of the present disclosure.

Description of reference numerals:

1, a pole piece assembly; 10, a positive pole piece; 101, a positive current collector; 102, a positive electrode active material layer; 11, a negative pole piece; 111, a negative current collector; 112, an anode active material layer; 12, a support body; 2, a diaphragm; 3, a positive electrode tab; and 4, a negative electrode tab.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The features of the terms first and second in the description and in the claims of the present disclosure may explicitly or implicitly include one or more of such features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specified.

In the description of the present disclosure, it is to be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing and simplifying the disclosure, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the disclosure.

In the description of the present disclosure, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

The disclosed embodiment provides a pole piece assembly 1. The pole piece assembly 1 comprises a positive pole piece 10, a negative pole piece 11 and a support body 12. The positive electrode tab 10 includes a positive electrode collector 101 and a positive electrode active material layer 102, and the positive electrode active material layer 102 and the positive electrode collector 101 are stacked.

The positive electrode active material layer 102 is a lithium ion compound. A lithium ion compound is formed on the surface of the positive electrode current collector 101 by means of coating.

The positive electrode active material layer 102 is one of LiCoO2, Li2MnO3, LiFePO4, or Li2FePO 4F.

The pole piece assembly 1 further comprises a negative pole piece 11. The negative electrode tab 11 includes a negative electrode collector 111 and a negative electrode active material layer 112, and the negative electrode active material layer 112 and the negative electrode collector 111 are stacked.

The negative electrode active material layer 112 is a carbon-based compound such as graphite, petroleum coke, carbon fiber, pyrolytic resin carbon, or the like. The negative electrode active material layer 112 is formed on the surface of the negative electrode collector 111 by coating.

The positive electrode collector 101 and the negative electrode collector 111 are made of metal. For example, the positive electrode collector 101 is an aluminum foil. The negative electrode collector 111 is a copper foil.

Lithium ions move between the positive pole piece 10 and the negative pole piece 11 to realize the charge and discharge functions of the battery. During the charge and discharge process, lithium ions are intercalated and deintercalated between the two electrodes: during charging, lithium ions are extracted from the positive electrode and are inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

The pole piece assembly 1 further includes a support body 12, referring to fig. 1, the support body 12 is a sheet structure, the positive current collector 101 is formed on one surface of the support body 12, the negative current collector 111 is formed on the surface of the support body 12 opposite to the positive current collector 101, and the positive pole piece 10, the negative pole piece 11 and the support body 12 form an integral structure.

The support 12 is a resin film, a PP film, or a PET film.

A positive electrode current collector 101 is formed on one surface of the support 12, a positive electrode active material layer 102 is formed on a surface of the positive electrode current collector 101 opposite to the support 12, and the positive electrode current collector 101 is located between the support 12 and the positive electrode active material layer 102.

A negative electrode current collector 111 is formed on the surface of the support 12 opposite to the positive electrode current collector 101, and a negative electrode active material layer 112 is formed on the surface of the negative electrode current collector 111 remote from the support 12.

In this way, the positive electrode tab 10, the support 12 and the negative electrode tab 11 are integrally formed.

Through the mode, the dislocation caused in the winding or stacking process of the split positive pole piece and the split negative pole piece in the prior art is avoided, and the defect of battery performance reduction caused by the dislocation of the split positive pole piece and the split negative pole piece is avoided.

In some embodiments of the present disclosure, the positive electrode current collector 101 and the negative electrode current collector 111 are formed on two opposite surfaces of the support 12 by means of electroplating. The positive electrode current collector 101 and the negative electrode current collector 111 may be formed on the respective opposite surfaces of the support 12 by vapor deposition.

In this way, the connection between the positive and negative electrode current collectors 101 and 111 and the support body 12 is made more firm, thereby forming an integral structure.

In addition, the thickness of the pole piece assembly 1 cannot be increased, and the performance of the battery is improved.

In some embodiments of the present disclosure, the width of the negative electrode current collector 111 is greater than the width of the positive electrode current collector 101. In this way, the positive active material of the positive electrode sheet 10 is maximally utilized, thereby improving the performance of the battery.

The embodiment of the disclosure provides a battery, which is a secondary battery and comprises a diaphragm 2 and a pole piece assembly 1. The battery also comprises a cell, and the pole piece assembly 1 is stacked or wound to form the cell.

The separator 2 is provided on the surface of one side of the pole piece assembly 1 to cover the positive electrode active material layer 102 or the negative electrode active material layer 112. The pole piece assembly 1 is wound or stacked to form a cell. The battery core is positioned in the shell of the battery.

Referring to fig. 2, the battery includes a cell formed by winding the pole piece assembly 1. The width of the diaphragm 2 is greater than the width of the pole piece assembly 1, and the length of the diaphragm 2 is greater than the length of the pole piece assembly 1.

By the mode, short circuit caused by direct contact between the positive electrode and the negative electrode of the battery core is avoided, and the performance of the battery is improved.

A reel is provided from one end of the separator 2 and the pole piece assembly 1 is wound along the reel to form a spiral cylindrical cell.

A positive electrode tab 3 is formed on the surface of the positive electrode current collector 101 of the pole piece assembly 1, and the positive electrode tab 3 extends from the core and is connected with the shell.

A negative electrode tab 4 is formed on the surface of the negative electrode current collector 111 of the pole piece assembly 1, and the negative electrode tab 4 extends from the core and is connected with the casing.

The positive electrode tab 3 and the negative electrode tab 4 are welded to the inner surface of the case by laser welding, resistance welding, or the like.

The positive electrode tab 3 and the positive electrode current collector 101 may be an integral structure, or the positive electrode tab 3 may be welded on the surface of the positive electrode current collector 101.

In another embodiment of the present disclosure, the pole piece assemblies 1 are stacked to form a cell

A plurality of positive electrode tabs 3 are formed on the surface of the positive electrode current collector 101, and one end of each of the plurality of positive electrode tabs 3 is welded to the case of the battery. Similarly, a plurality of negative electrode tabs 4 are formed on the surface of the negative electrode current collector 111, and one end of each of the plurality of negative electrode tabs 4 is welded to the outer case of the battery.

In some embodiments of the present disclosure, as shown in fig. 2, the diaphragm 2 is formed as a unitary structure with the pole piece assembly 1. The pole piece assembly 1 is fixed on the diaphragm 2, and is connected with the diaphragm 2 by bonding or hot pressing. The integral structure formed by the diaphragm 2 and the pole piece assembly 1 is formed into a cell in a winding or stacking mode. In such a way, the problem that the battery performance is reduced due to the fact that the diaphragm 2 and the pole piece assembly 1 are dislocated in the process of forming the battery core is further avoided.

The embodiment of the disclosure also provides an electronic device, and the battery supplies power to the electronic device. The electronic device is an electronic product or a vehicle. Electronic products such as earphones, mobile phones, computers, headsets and the like, and vehicles such as electric automobiles and electric bicycles and the like.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present disclosure have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A pole piece assembly, comprising:

the positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer and the positive current collector are stacked;

the negative pole piece comprises a negative current collector and a negative active material layer, and the negative active material layer and the negative current collector are stacked; and

the support body is of a sheet structure, the positive current collector is formed on one surface of the support body, the negative current collector is formed on the surface of the support body opposite to the positive current collector, and the positive pole piece, the negative pole piece and the support body form an integrated structure.

2. The pole piece assembly of claim 1, wherein the positive electrode current collector and the negative electrode current collector are formed on two opposite surfaces of the support body by means of electroplating.

3. The pole piece assembly of claim 1, wherein a width of the negative current collector is greater than a width of the positive current collector.

4. The pole piece assembly of claim 1, wherein the positive and negative current collectors are metal.

5. The pole piece assembly of claim 1, wherein the positive active material layer is a lithium ion compound and the negative active material layer is a carbon-based compound.

6. The pole piece assembly of claim 1 wherein the support is a resin.

7. A battery comprising a separator and the pole piece assembly of any one of claims 1 to 6, wherein the separator is covered on the positive electrode active material layer or the negative electrode active material layer.

8. The battery of claim 7, wherein the separator forms a unitary structure with the pole piece assembly.

9. The battery of claim 7, wherein the battery comprises a cell, and wherein the pole piece assembly is stacked or wound to form the cell.

10. An electronic device comprising the battery according to any one of claims 7 to 9.