CN207572477U - Electrode assembly and secondary cell - Google Patents

Electrode assembly and secondary cell Download PDF

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Publication number
CN207572477U
CN207572477U CN201721725456.XU CN201721725456U CN207572477U CN 207572477 U CN207572477 U CN 207572477U CN 201721725456 U CN201721725456 U CN 201721725456U CN 207572477 U CN207572477 U CN 207572477U
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winding
initial segment
negative
electrode assembly
plate
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梁涛
李白清
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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

The utility model provides a kind of electrode assembly and secondary cell.Electrode assembly includes positive plate, negative plate and the diaphragm for separating positive plate and negative plate, and positive plate, negative plate and diaphragm arranged stacked are simultaneously wound together.Positive plate includes plus plate current-collecting body and positive electrode active material layer, and negative plate includes negative current collector and negative electrode active material layer.Positive plate has the anode winding the initial segment extended along its length.Negative plate cathode winding the initial segment head end towards the electrode assembly winding center inflection and form body region and inflection area;Body region extends along its length, and body region and anode winding the initial segment are respectively positioned at the both sides of the winding center of the electrode assembly;Inflection area is clamped between body region and anode winding the initial segment.In anode winding the initial segment, positive electrode active material layer is equipped on two surfaces of plus plate current-collecting body;In cathode winding the initial segment, negative electrode active material layer is equipped on two surfaces of negative current collector.

Description

Electrode assembly and secondary cell
Technical field
The utility model is related to field of batteries more particularly to a kind of electrode assemblies and secondary cell.
Background technology
Secondary cell (such as lithium ion battery) can realize the direct mutual conversion of electric energy and chemical energy, be a kind of repeatable The green battery used.In recent years, under the background for vigorously advocating new-energy automobile in national governments, secondary cell causes common people Extensive concern.As the energy resource supply of electric vehicle, the energy density of secondary cell, which is promoted, becomes cell engineering Shi Gongtong faces The problem of facing.
In the winding-structure of current inside lithium ion cell, in order to improve battery energy density, with reference to Fig. 3, the volume Negative electrode active material layer 22 is equipped with around the two sides of the negative plate 2 of structure innermost layer, however, since the inner end of negative plate 2 is by just The corner part package of pole piece 1, so leading to coefficient of balance (i.e. negative electrode active of the lithium ion battery at the head end of negative plate 2 The ratio of the capacity of material and the capacity of positive electrode active materials) less than 1, lithium ion battery is in turn resulted in during charge and discharge Lithium is analysed, seriously affects the performance and service life of lithium ion battery.
Utility model content
In view of the problem of background technology, the purpose of this utility model is to provide a kind of electrode assemblies and secondary electricity Pond can increase capacity, improve performance and prolong the service life.
To achieve these goals, in a first aspect, the utility model provides a kind of electrode assembly, including anode Piece, negative plate and the diaphragm for separating positive plate and negative plate, the positive plate, negative plate and diaphragm arranged stacked are simultaneously wound Together.Positive plate includes plus plate current-collecting body and the positive electrode active material layer for being arranged on plus plate current-collecting body surface, and negative plate includes Negative current collector and the negative electrode active material layer for being arranged on negative current collector surface.Positive plate has to be extended just along its length Pole winds the initial segment.There is negative plate cathode to wind the initial segment, and the head end of cathode winding the initial segment is towards the electrode assembly Winding center inflection simultaneously forms body region and inflection area;Body region extends along its length, and body region and anode winding starting Section is respectively positioned at the both sides of the winding center through-thickness of the electrode assembly;Inflection area is clamped in body region and anode winding Between the initial segment.In anode winding the initial segment, positive electrode active material layer is equipped on two surfaces of plus plate current-collecting body;Negative In the winding the initial segment of pole, negative electrode active material layer is equipped on two surfaces of negative current collector.
To achieve these goals, in second aspect, the utility model provides a kind of secondary cell, including according to this Electrode assembly described in utility model first aspect.
The beneficial effects of the utility model are as follows:
In electrode assembly according to the present utility model and secondary cell, the positive-active of the inside of anode winding the initial segment Material layer is opposite with the negative electrode active material layer of the body region of cathode winding the initial segment, and therefore, lithium ion can be in the anode Embedded and deintercalation back and forth between active material layer and the negative electrode active material layer, so as to improve the capacity of the electrode assembly, Avoid the waste of active material.Simultaneously as the winding center of head end towards the electrode assembly of cathode winding the initial segment returns Folding avoids the head end of cathode winding the initial segment from being wrapped up by the corner part of positive plate, prevents the electrode assembly from being wound in cathode Coefficient of balance at the head end of the initial segment is less than 1, and then the electrode assembly is avoided to analyse lithium during charge and discharge, improves negative The utilization rate of negative electrode active material layer in the winding the initial segment of pole, improves the performance of electrode assembly and secondary cell, extends The service life of electrode assembly and secondary cell.
Description of the drawings
Fig. 1 is the schematic diagram according to the electrode assembly of the utility model.
Fig. 2 is the telescopiny schematic diagram of the lithium ion in the electrode assembly according to the utility model.
Fig. 3 is the telescopiny schematic diagram of the lithium ion in the electrode assembly of the prior art.
Wherein, the reference numerals are as follows:
1 positive plate S2 cathode wind the initial segment
11 plus plate current-collecting body S21 body regions
12 positive electrode active material layer S22 inflection areas
2 negative plate S3 membrane winding the initial segments
21 negative current collector X length directions
22 negative electrode active material layer Y thickness directions
3 diaphragm C winding centers
S1 anodes wind the initial segment
Specific embodiment
It is described in detail the electrode assembly of the utility model and secondary cell with reference to the accompanying drawings.
Illustrate the electrode assembly according to the utility model first aspect first.
Referring to Figures 1 and 2, electrode assembly according to the present utility model includes positive plate 1, negative plate 2 and by positive plate 1 The diaphragm 3 separated with negative plate 2, the positive plate 1, negative plate 2 and 3 arranged stacked of diaphragm are simultaneously wound together.Positive plate 1 wraps It includes plus plate current-collecting body 11 and is arranged on the positive electrode active material layer 12 on 11 surface of plus plate current-collecting body, negative plate 2 includes negative pole currect collecting Body 21 and the negative electrode active material layer 22 for being arranged on 21 surface of negative current collector.Positive plate 1 has X extensions along its length just Pole winding the initial segment S1.There is negative plate 2 cathode to wind the initial segment S2, and the head end of cathode winding the initial segment S2 is towards the electrode The winding center C inflection of component simultaneously forms body region S21 and inflection area S22;X extends, and main body body region S21 along its length Area S21 and anode winding the initial segment S1 are respectively positioned at the both sides of the winding center C through-thickness Y of the electrode assembly;Inflection Area S22 is clamped between body region S21 and anode winding the initial segment S1.On anode winding the initial segment S1, plus plate current-collecting body 11 Two surfaces on be equipped with positive electrode active material layer 12;On cathode winding the initial segment S2, two tables of negative current collector 21 Negative electrode active material layer 22 is equipped on face.
Positive plate 1, diaphragm 3 and negative plate 2 are stacked successively first, then under the traction of spool on spool simultaneously Flat jelly web-like is formed, spool is detached after the completion of winding.Position where spool may be defined as the electrode assembly Winding center C.Positive plate 1 is defined as anode winding the initial segment S1 close to one section that winding center C is set, and negative plate 2 is close to volume One section around center C settings is defined as cathode winding the initial segment S2.Aftermentioned inside each means the side towards winding center C, Outside is away from the side of winding center C.
Positive electrode active material layer 12 include positive electrode active materials, the positive electrode active materials for can deintercalate lithium ions, sodium from The material of son or zinc ion.Negative electrode active material layer 22 includes negative electrode active material.
Illustrate the electrode assembly of the utility model for being capable of the positive electrode active materials of deintercalate lithium ions below.
The positive electrode active materials include one or more of cobalt acid lithium, lithium nickelate, LiFePO4 or LiMn2O4;It is described Negative electrode active material includes one or more of native graphite, Delanium, hard carbon, silicon, silico-carbo compound.Diaphragm 3 is poly- Ethylene PE monofilms, polypropylene PP monofilms or PP/PE/PP sandwich diaphragms.Plus plate current-collecting body 11 can be aluminium foil, negative pole currect collecting Body 21 can be copper foil.
The body region S21 of the positive electrode active material layer 12 of the inside of anode winding the initial segment S1 and cathode winding the initial segment S2 Negative electrode active material layer 22 it is opposite, therefore, lithium ion can be in the positive electrode active material layer 12 and the negative electrode active material Embedded and deintercalation back and forth, so as to improve the capacity of the electrode assembly, avoids the waste of active material between matter layer 22.Meanwhile With reference to Fig. 2, since the head end of cathode winding the initial segment S2 is towards the winding center C inflection of the electrode assembly, cathode is avoided to roll up Head end around the initial segment S2 is wrapped up by the corner part of positive plate 1, prevents the electrode assembly cathode winding the initial segment S2's Coefficient of balance (i.e. the ratio of the capacity of the capacity and positive electrode active materials of negative electrode active material) at head end is kept away less than 1 Exempt from the electrode assembly and lithium is analysed during charge and discharge, raising cathode winds the negative electrode active material layer 22 on the initial segment S2 Utilization rate improves the performance of electrode assembly, extends the service life of electrode assembly.
The head end of positive electrode active material layer 12 from plus plate current-collecting body 11 extends to the tail end of plus plate current-collecting body 11.Due to anode Collector 11 is covered with positive electrode active material layer 12 on the direction of extension, so during positive plate 1 is prepared, by slurry (for example, can be mixed by ternary material NCM, conductive carbon, binding agent and solvent) is continuously coated on the two of plus plate current-collecting body 11 A surface is coated with without gap, so as to improve coating efficiency and excellent rate, reduces cost.
The head end of negative electrode active material layer 22 from negative current collector 21 extends to the tail end of negative current collector 21.Due to cathode Collector 21 is covered with negative electrode active material layer 22 on the direction of extension, so during negative plate 2 is prepared, by slurry (for example, can be mixed by graphite, conductive carbon, bonding agent, thickener and solvent) is continuously coated on the two of negative current collector 21 A surface is coated with without gap, so as to improve coating efficiency and excellent rate, reduces cost.
The length of inflection area S22 is that cathode winds the 2%~15% of the initial segment S2 entire lengths, preferably 5%.Inflection area The negative electrode active material layer 22 of the inside of S22 can not be opposite with positive electrode active material layer 12, it is possible that negative electrode active can be caused The waste of material, therefore, the length of inflection area S22 should be small as far as possible, as long as the head of cathode winding the initial segment S2 can be prevented End analysis lithium, so as to reduce the waste of negative electrode active material as far as possible.
The length of the diaphragm 3 of anode winding the initial segment S1 through-thickness Y both sides is more than the length of anode winding the initial segment S1 Degree, and diaphragm 3 beyond the part of anode winding the initial segment S1 as membrane winding the initial segment S3 and towards the electrode assembly Winding center C inflection.Membrane winding the initial segment S3 is namely close to one section of diaphragm of winding center C.The membrane winding of inflection rises Beginning section S3 can wrap up the head end of anode winding the initial segment S1, avoid the corner part of anode winding the initial segment S1 and negative plate 2 Contact, prevents short circuit.
The length of membrane winding the initial segment S3 winds the 2%~15% of the length of the initial segment S1 for anode, and preferably 5%.
With reference to Fig. 1, the number of plies of the diaphragm 3 between anode winding the initial segment S1 and cathode winding the initial segment S2 is less than or equal to 3. Since membrane winding the initial segment S3 needs to be folded back between pole winding the initial segment S1 and cathode winding the initial segment S2, so can increase Anode winds the number of plies of the diaphragm 3 between the initial segment S1 and cathode winding the initial segment S2, but is had in winding by diaphragm 3 The number of plies control within 3 layers, otherwise will appear plus and negative induced polarization method problem.
Secondly illustrate the secondary cell according to the utility model second aspect.
With reference to Fig. 1, the secondary cell of the utility model includes the electrode assembly according to the utility model first aspect.
The electrolyte that the secondary cell further includes the housing of receiving electrode assembly and is housed in housing.
The secondary cell can be lithium ion battery, Zinc ion battery or sodium-ion battery.

Claims (10)

1. a kind of electrode assembly, including positive plate (1), negative plate (2) and by positive plate (1) and negative plate (2) separate every Film (3), the positive plate (1), negative plate (2) and diaphragm (3) arranged stacked are simultaneously wound together;
Positive plate (1) is including plus plate current-collecting body (11) and is arranged on the positive electrode active material layer on plus plate current-collecting body (11) surface (12);
Negative plate (2) is including negative current collector (21) and is arranged on the negative electrode active material layer on negative current collector (21) surface (22);
It is characterized in that,
Positive plate (1) has the anode winding the initial segment (S1) of (X) extension along its length;
Negative plate (2) has cathode winding the initial segment (S2), and the head end of cathode winding the initial segment (S2) is towards the electrode assembly Winding center (C) inflection and form body region (S21) and inflection area (S22);(X) extends along its length for body region (S21), And body region (S21) and anode winding the initial segment (S1) are located at winding center (C) through-thickness of the electrode assembly respectively (Y) both sides;Inflection area (S22) is clamped between body region (S21) and anode winding the initial segment (S1);
In anode winding the initial segment (S1), positive electrode active material layer is equipped on two surfaces of plus plate current-collecting body (11) (12);In cathode winding the initial segment (S2), negative electrode active material layer is equipped on two surfaces of negative current collector (21) (22)。
2. electrode assembly according to claim 1, which is characterized in that
The head end of positive electrode active material layer (12) from plus plate current-collecting body (11) extends to the tail end of plus plate current-collecting body (11);
The head end of negative electrode active material layer (22) from negative current collector (21) extends to the tail end of negative current collector (21).
3. electrode assembly according to claim 1, which is characterized in that the length of inflection area (S22) is cathode winding starting The 2%~15% of section (S2) entire length.
4. electrode assembly according to claim 3, which is characterized in that the length of inflection area (S22) is cathode winding starting The 5% of section (S2) entire length.
5. electrode assembly according to claim 1, which is characterized in that anode winds the initial segment (S1) through-thickness (Y) The length of the diaphragm (3) of both sides is more than the length of anode winding the initial segment (S1), and diaphragm (3) winds the initial segment beyond anode (S1) part is as membrane winding the initial segment (S3) and towards winding center (C) inflection of the electrode assembly.
6. electrode assembly according to claim 5, which is characterized in that the length of membrane winding the initial segment (S3) is rolled up for anode Around the 2%~15% of the length of the initial segment (S1).
7. electrode assembly according to claim 6, which is characterized in that the length of membrane winding the initial segment (S3) is rolled up for anode Around the 5% of the length of the initial segment (S1).
8. electrode assembly according to claim 1, which is characterized in that anode winding the initial segment (S1) and cathode winding starting The number of plies of diaphragm (3) between section (S2) is less than or equal to 3.
9. electrode assembly according to claim 1, which is characterized in that
Positive electrode active material layer (12) includes positive electrode active materials, and the positive electrode active materials are energy deintercalate lithium ions, sodium ion Or the material of zinc ion.
10. a kind of secondary cell, which is characterized in that including the electrode assembly according to any one of claim 1-9.
CN201721725456.XU 2017-12-12 2017-12-12 Electrode assembly and secondary cell Active CN207572477U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020118884A1 (en) * 2018-12-12 2020-06-18 宁德时代新能源科技股份有限公司 Wound-type cell, lithium ion secondary battery and negative electrode plate
CN112563560A (en) * 2021-02-23 2021-03-26 江苏时代新能源科技有限公司 Battery cell, battery, electric device, and method for manufacturing battery cell

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020118884A1 (en) * 2018-12-12 2020-06-18 宁德时代新能源科技股份有限公司 Wound-type cell, lithium ion secondary battery and negative electrode plate
CN111312987A (en) * 2018-12-12 2020-06-19 宁德时代新能源科技股份有限公司 Winding type battery cell, lithium ion secondary battery and negative pole piece
CN111312987B (en) * 2018-12-12 2021-08-17 宁德时代新能源科技股份有限公司 Winding type battery cell, lithium ion secondary battery and negative pole piece
CN112563560A (en) * 2021-02-23 2021-03-26 江苏时代新能源科技有限公司 Battery cell, battery, electric device, and method for manufacturing battery cell
CN112563560B (en) * 2021-02-23 2021-05-18 江苏时代新能源科技有限公司 Battery cell, battery, electric device, and method for manufacturing battery cell

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