CN208336372U - Electrode plates, electrode assembly and secondary cell - Google Patents

Electrode plates, electrode assembly and secondary cell Download PDF

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Publication number
CN208336372U
CN208336372U CN201820381376.5U CN201820381376U CN208336372U CN 208336372 U CN208336372 U CN 208336372U CN 201820381376 U CN201820381376 U CN 201820381376U CN 208336372 U CN208336372 U CN 208336372U
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China
Prior art keywords
electrode plates
layer
current collector
electrode
cathode
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CN201820381376.5U
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Chinese (zh)
Inventor
郑拓
郭超
郑建峰
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

It includes cathode active material layer, cathode current collector, insulating bond, conductive layer and anode active material layer that the utility model, which provides a kind of electrode plates, electrode assembly and secondary cell, electrode plates,.Wherein, cathode active material layer is arranged on one of surface of cathode current collector, insulating bond is arranged on another surface of cathode current collector, insulating bond is arranged in far from the surface of cathode current collector in conductive layer, and conductive layer is arranged in far from the surface of insulating bond in anode active material layer.The electrode plates of the utility model can improve the gravimetric energy density of electrode assembly and secondary cell using it.

Description

Electrode plates, electrode assembly and secondary cell
Technical field
The utility model relates to field of batteries more particularly to a kind of electrode plates, electrode assembly and secondary cell.
Background technique
Lithium ion battery is widely used in every field, particularly, sends a telegram here in recent years as a kind of novel green power supply Explosive growth trend is presented in dynamic vehicle lithium-ion power battery, and how to improve the gravimetric energy density of lithium ion battery always The problem that each enterprise and scientific research institution assault fortified position.
For lithium ion battery, weight is mainly derived from the weight of cathode sheet and anode pole piece, cathode sheet Generally include cathode current collector (usually aluminium foil, density 2.702g/cm3) and the cathode on cathode current collector surface is set Active material layer, anode pole piece generally include anode collector (usually copper foil, density 8.960g/cm3) and setting exist The anode active material layer on anode collector surface.For electrode plates, collector proportion is very big.Prior art master If reducing its proportion by the thickness for reducing copper foil and aluminium foil, but with the reduction of copper foil and aluminum foil thickness, one Its manufacture difficulty of aspect increases, and on the other hand it also will appear various problems in use, for example, copper foil and aluminium foil are thinner Its more easy disconnected band in use, seriously affects production.
Utility model content
In view of the problems in the background art, the purpose of this utility model is to provide a kind of electrode plates, electrode group Part and secondary cell can improve gravimetric energy density.
In order to achieve the above object, in the utility model in a first aspect, the utility model provides a kind of electrode plates, It includes cathode active material layer, cathode current collector, insulating bond, conductive layer and anode active material layer.Wherein, cathode Active material layer is arranged on one of surface of cathode current collector, and another of cathode current collector is arranged in insulating bond On surface, insulating bond is arranged in far from the surface of cathode current collector in conductive layer, and anode active material layer is arranged in conduction Layer is far from the surface of insulating bond.
In the second aspect of the utility model, the utility model provides a kind of electrode assembly, by the utility model The electrode plates of one side and diaphragm are rolled and/or stacked form.
In the third aspect of the utility model, the utility model provides a kind of secondary cell comprising the utility model Electrode assembly described in second aspect.
Compared with the existing technology, the utility model include at least it is as described below the utility model has the advantages that
The electrode plates of the utility model are by cathode sheet used in existing electrode assembly and secondary cell and anode pole Piece is brought together, and eliminates anode collector in the prior art, such as the use of copper foil, therefore can reduce electrode assembly and two The weight of primary cell improves gravimetric energy density.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the electrode plates of the utility model.
Fig. 2 is the structural schematic diagram of the electrode assembly of the utility model.
Wherein, the reference numerals are as follows:
1 electrode plates
11 cathode active material layers
12 cathode current collectors
13 insulating bonds
14 conductive layers
15 anode active material layers
16 dielectric ceramic layers
2 diaphragms
T thickness direction
W width direction
Specific embodiment
It is described in detail the electrode plates, electrode assembly and secondary cell of the utility model with reference to the accompanying drawing.
Illustrate the electrode plates according to the utility model first aspect first.
Referring to Fig.1, electrode plates 1 according to the present utility model include cathode active material layer 11, cathode current collector 12, absolutely Edge adhesive layer 13, conductive layer 14 and anode active material layer 15.Wherein, cathode active material layer 11 is arranged in cathode current collector On 12 one of surface, insulating bond 13 is arranged on another surface of cathode current collector 12, and conductive layer 14 is arranged On surface of the insulating bond 13 far from cathode current collector 12, the setting of anode active material layer 15 is in conductive layer 14 far from insulation On the surface of adhesive layer 13.
The electrode plates of the utility model are by cathode sheet used in existing electrode assembly and secondary cell and anode pole Piece is brought together, i.e., is combined into one the cathode sheet being used separately in the prior art and anode pole piece, eliminates existing skill Art Anodic collector, such as the use of copper foil, therefore the weight of electrode assembly and secondary cell can be reduced, improve weight energy Density.
In the electrode plates 1 of the utility model, insulating bond 13 plays insulating effect, prevents conductive layer 14 and cathode Collector 12 directly contacts and internal short-circuit occurs;Insulating bond 13 also acts as conductive layer 14 and the bonding of cathode current collector 12 is solid Fixed effect.Insulating bond 13 is insulating polymer resins, wherein the specific type of insulating polymer resins is unrestricted, As long as insulating effect and cementation can be played.Specifically, insulating polymer resins preferably can be selected from polyolefin or contain Fluorine polyolefin, polyolefin preferably can be polypropylene (PP), polyethylene (PE) etc., and fluorine-containing polyolefin preferably can be Kynoar (PVDF).Preferably, insulating polymer resins PVDF.
In the electrode plates 1 of the utility model, conductive layer 14 plays the role of conducting electronics.Conductive layer 14 may include leading Electrical carbon, wherein conductive carbon can be selected from graphene, electrically conductive graphite, carbon nanotube, gas-phase growth of carbon fibre, one in conductive black Kind is several.In addition to conductive carbon, conductive layer 14 may also include a small amount of binder.
In the electrode plates 1 of the utility model, cathode current collector 12 can be aluminium foil, punching aluminium foil or carbon-coated aluminum foils.
In the electrode plates 1 of the utility model, insulating bond 13 with a thickness of 1 μm~5 μm.
In the electrode plates 1 of the utility model, conductive layer 14 with a thickness of 1 μm~5 μm.
In the electrode plates 1 of the utility model, cathode active material layer 11 may include active material of cathode, conductive agent with And binder.Wherein, the type of active material of cathode, conductive agent and binder is unrestricted, can be selected according to demand It selects.
In the electrode plates 1 of the utility model, anode active material layer 15 may include active material of positive electrode, conductive agent with And binder.Wherein, the type of active material of positive electrode, conductive agent and binder is unrestricted, can be selected according to demand It selects.
In the electrode plates 1 of the utility model, the thickness of cathode active material layer 11 and anode active material layer 15 It is unrestricted, can the energy density according to needed for battery core component and secondary cell be adaptively adjusted.
In the electrode plates 1 of the utility model, electrode plates 1 may also include dielectric ceramic layer 16, dielectric ceramic layer 16 The region of the uncoated cathode active material layer 11 in both ends of W in the width direction of cathode current collector 12 is set, and playing prevents tab 12 burrs on edges of cathode current collector pierces through diaphragm and causes the effect of short circuit in die cutting process, while being formed on cathode current collector 12 The region overhang.
In one embodiment, referring to Fig.1, the thickness A of dielectric ceramic layer 16 can be 20 μm~50 μm.Dielectric ceramic layer 16 The thickness of thickness and cathode active material layer 11 may be the same or different.
In one embodiment, dielectric ceramic layer 16 may include inorganic ceramic material.Preferably, inorganic ceramic material can be selected from Al2O3、SiO2、ZrO2And TiO2One or more of.
Secondly illustrate the electrode assembly according to the utility model second aspect.
Referring to Fig. 2, according to the electrode assembly of the utility model second aspect by the electrode pole of the utility model first aspect Piece 1 and diaphragm 2 are rolled and/or stacked form.
The electrode assembly of the utility model can be takeup type or stacked or volume plus stacked.In Fig. 2, electrode pole is only shown Coiled electrode assemblies structure made of piece 1 and diaphragm 2 are rolled, but the utility model is without being limited thereto.
The electrode assembly of the utility model eliminates existing electrode assembly Anodic collector, such as the use of copper foil, because This can reduce the overall weight of electrode assembly, improve gravimetric energy density.
Compared with the electrode assembly of the prior art includes cathode sheet, anode pole piece and diaphragm, the electricity of the utility model Cathode sheet and anode pole piece set are only included after gathering into the same electrode plates, therefore in electrode assembly by pole component Electrode plates and diaphragm, can greatly improve the preparation efficiency of electrode assembly, while save manufacturing cost.
Finally illustrate the secondary cell according to the utility model third aspect.
Secondary cell according to the utility model third aspect include electrode assembly described in the utility model second aspect, It accommodates the shell of electrode assembly and is contained in the intracorporal electrolyte of shell.
The secondary cell of the utility model third aspect can for lithium ion battery, sodium-ion battery, Magnesium ion battery and Other any secondary cells using electrode assembly described in the utility model second aspect.

Claims (10)

1. a kind of electrode plates (1) characterized by comprising
Cathode current collector (12);
Cathode active material layer (11) is arranged on one of surface of cathode current collector (12);
Insulating bond (13) is arranged on another surface of cathode current collector (12);
Conductive layer (14) is arranged on the surface of insulating bond (13) far from cathode current collector (12);And
Anode active material layer (15) is arranged on the surface of conductive layer (14) far from insulating bond (13).
2. electrode plates (1) according to claim 1, which is characterized in that insulating bond (13) is selected from insulating polymer Resin.
3. electrode plates (1) according to claim 1, which is characterized in that insulating bond (13) with a thickness of 1 μm~5 μ m。
4. electrode plates (1) according to claim 1, which is characterized in that conductive layer (14) includes conductive carbon, conductive carbon choosing From one of graphene, electrically conductive graphite, carbon nanotube, gas-phase growth of carbon fibre, conductive black.
5. electrode plates (1) according to claim 1, which is characterized in that conductive layer (14) with a thickness of 1 μm~5 μm.
6. electrode plates (1) according to any one of claims 1-5, which is characterized in that electrode plates (1) further include exhausted The uncoated cathode active material layer in both ends (11) in cathode current collector (12) (W) in the width direction is arranged in edge ceramic layer (16) Region.
7. electrode plates (1) according to claim 6, which is characterized in that dielectric ceramic layer (16) with a thickness of 20 μm~ 50μm。
8. electrode plates (1) according to claim 6, which is characterized in that dielectric ceramic layer (16) includes inorganic ceramic material Material.
9. a kind of electrode assembly, which is characterized in that by electrode plates according to claim 1 to 8 (1) with every Film (2) is rolled and/or stacked forms.
10. a kind of secondary cell, which is characterized in that including electrode assembly according to claim 9.
CN201820381376.5U 2018-03-20 2018-03-20 Electrode plates, electrode assembly and secondary cell Active CN208336372U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820381376.5U CN208336372U (en) 2018-03-20 2018-03-20 Electrode plates, electrode assembly and secondary cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820381376.5U CN208336372U (en) 2018-03-20 2018-03-20 Electrode plates, electrode assembly and secondary cell

Publications (1)

Publication Number Publication Date
CN208336372U true CN208336372U (en) 2019-01-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110120545A (en) * 2019-05-13 2019-08-13 浙江锋锂新能源科技有限公司 Contactless mixing solid-liquid electrolyte lithium battery of one kind and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110120545A (en) * 2019-05-13 2019-08-13 浙江锋锂新能源科技有限公司 Contactless mixing solid-liquid electrolyte lithium battery of one kind and preparation method thereof

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