CN109585932B - Manufacturing method of symmetrical battery and symmetrical battery - Google Patents
Manufacturing method of symmetrical battery and symmetrical battery Download PDFInfo
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- CN109585932B CN109585932B CN201811563769.9A CN201811563769A CN109585932B CN 109585932 B CN109585932 B CN 109585932B CN 201811563769 A CN201811563769 A CN 201811563769A CN 109585932 B CN109585932 B CN 109585932B
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- 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
- H01M10/058—Construction or manufacture
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- 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
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a manufacturing method of a symmetrical battery and the symmetrical battery, wherein the manufacturing method of the symmetrical battery comprises the following steps: placing the two working electrodes welded with the tabs and the counter electrode welded with the tabs into a containing cavity of a stamped aluminum-plastic film, arranging a diaphragm between the working electrodes and the counter electrode, and leading the tabs out of the aluminum-plastic film; packaging the aluminum-plastic film, and sealing after injecting electrolyte; carrying out charging and discharging operation to enable the two working electrodes to reach a target SOC state; and taking the counter electrode out of the aluminum plastic film, and sealing again to obtain the symmetrical battery. The invention utilizes the characteristic that the aluminum plastic film can be cut and is easy to be packaged, and the design of 'removable symmetrical electrodes' greatly simplifies the manufacturing process of the symmetrical battery, simultaneously ensures that the electrodes of the symmetrical battery are always in the electrolyte environment, avoids the influence of adverse external environment, ensures the stability of the electrode property to the maximum extent, and ensures that the subsequent electrochemical test structure is more accurate and reliable.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a manufacturing method of a symmetrical battery and the symmetrical battery.
Background
The lithium ion battery is used as a green and environment-friendly new energy source, has the advantages of good reliability, high safety, small volume, light weight and the like, and is widely applied to the fields of digital products, electric automobiles, military products and the like. At present, the research on anode and cathode materials before the preparation of the lithium ion battery is sufficient, but the research on the rear electrode material of the prepared lithium ion battery is deficient.
The research on the ohmic impedance, the electrochemical impedance spectrum and the cycle voltammetry performance of the lithium ion battery is realized by manufacturing the symmetrical battery, and the research on the overall performance improvement of the lithium ion battery is of great significance.
SOC, collectively referred to as State of Charge, also called the remaining Charge, represents the ratio of the remaining capacity of a battery after a period of use or after long standing to its capacity in a fully charged State, expressed in percent. When the SOC is 0, it indicates that the battery is completely discharged, and when the SOC is 1, it indicates that the battery is completely charged. In the prior art, a method for manufacturing a symmetric battery generally includes adjusting charging and discharging of a finished lithium ion battery to an SOC state to be tested, disassembling the battery, and taking out two identical positive plates (or negative plates) to assemble a symmetric electrode. The manufacturing method mainly has the defects that the manufacturing process is too complicated, errors are easy to occur, the state of an electrode is changed in the process, and the like.
Disclosure of Invention
One object of the present invention is to provide a method for manufacturing a symmetrical battery, which is simple, fast and accurate.
It is another object of the present invention to provide a symmetrical battery that can be used for electrochemical testing to detect electrode performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
on the one hand, the manufacturing method of the symmetrical battery is provided, and comprises the following steps:
s10, providing two same-polarity electrodes as working electrodes, and enabling the two working electrodes to be respectively welded with a first tab;
s20, providing a counter electrode, and enabling the counter electrode to be welded with the second pole ear;
s30, providing an aluminum-plastic film, wherein the aluminum-plastic film is provided with a containing cavity formed by punching, so that the working electrode and the counter electrode are both arranged in the containing cavity, the counter electrode is arranged between the two working electrodes, a diaphragm is arranged between the working electrode and the counter electrode, and the first tab and the second tab are both led out of the aluminum-plastic film;
s40, packaging the aluminum plastic film, and sealing after injecting electrolyte;
s50, performing charge and discharge operation to enable the two working electrodes to reach a target SOC state;
and S60, separating the counter electrode from the aluminum plastic film, and sealing again to obtain the symmetrical battery.
In a preferred embodiment of the present invention, the two working electrodes have the same size and are arranged in mirror symmetry with respect to the counter electrode.
In a preferred embodiment of the present invention, the size of the counter electrode is larger than the sizes of the two working electrodes, so that the two working electrodes are completely located within the area of the counter electrode.
In a preferred embodiment of the present invention, the second tab and the two first tabs are led out from different sides of the aluminum-plastic film.
As a preferable scheme of the present invention, the two first tabs are respectively led out from two opposite sides of the aluminum-plastic film, and a leading-out direction of the second tab is perpendicular to a leading-out direction of the two first tabs.
In a preferred embodiment of the present invention, the separators on opposite sides of the counter electrode together form a separator bag enclosing the counter electrode.
In a preferred embodiment of the present invention, the membrane bag is at least one layer.
As a preferable embodiment of the present invention, step S50 specifically includes the following steps:
s510, connecting the two first lugs to the positive electrode of a power supply, and connecting the second lug to the negative electrode of the power supply;
and S520, performing charging and discharging operation to enable the two working electrodes to reach a target SOC state.
In a preferred embodiment of the present invention, the two working electrodes are subjected to at least one charge-discharge cycle before the target SOC state is reached.
On the other hand, a symmetrical battery is provided, which is manufactured by the manufacturing method of the symmetrical battery according to any one of the above technical solutions.
The invention has the beneficial effects that: the invention utilizes the characteristic that the aluminum plastic film can be cut and is easy to be packaged, and the design of 'removable symmetrical electrodes' greatly simplifies the manufacturing process of the symmetrical battery, simultaneously ensures that the electrodes of the symmetrical battery are always in the electrolyte environment, avoids the influence of adverse external environment, ensures the stability of the electrode property to the maximum extent, and ensures that the subsequent electrochemical test structure is more accurate and reliable.
Drawings
Fig. 1 is a schematic structural diagram of a symmetrical battery according to an embodiment of the present invention.
In the figure:
1. a working electrode; 10. a first tab; 2. a counter electrode; 20. a second tab; 3. a first membrane bag; 4. a second membrane bag; 5. and (3) an aluminum plastic film.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Example one
As shown in fig. 1, the method for manufacturing the symmetrical battery of the present embodiment is as follows:
two like pole pieces which are prepared by die cutting are taken as working electrodes 1 and are respectively welded with two first pole lugs 10. A piece of prepared counter electrode 2 is taken and welded with the second lug 20. Taking an aluminum plastic film 5 which is subjected to punch forming, wherein the aluminum plastic film 5 is provided with a containing cavity. Two working electrodes 1 are placed in a containing cavity of an aluminum plastic film 5, a first diaphragm bag 3 is placed between the two working electrodes 1, a counter electrode 2 is placed in a second diaphragm bag 4, and then the second diaphragm bag 4 is integrally placed in the first diaphragm bag 3.
The two first tabs 10 are respectively led out from two opposite sides of the aluminum-plastic film 5, the second tab 20 is led out from the direction vertical to the leading-out direction of the two first tabs 10, the aluminum-plastic film 5 is packaged, and the first sealing is carried out after the electrolyte is injected.
After the first sealing is finished, connecting the two first lugs 10 with the anode of an external power supply, and connecting the second lug 20 with the cathode of the external power supply, and performing charge-discharge circulation. After at least one charge-discharge cycle, the two working electrodes 1 are adjusted to the target SOC state.
And after the two working electrodes 1 are adjusted to the target SOC state, cutting off the aluminum plastic film on one side of the second lug 20, taking the second diaphragm bag 4 and the counter electrode 2 out of the aluminum plastic film 5, and sealing for the second time to obtain the manufactured symmetrical battery.
In this embodiment, the second separator bag 4 has a size smaller than that of the first separator bag 3, so that the second separator bag 4 containing the counter electrode 2 can be entirely placed inside the first separator bag 3. The double-layer diaphragm bag can effectively reduce the risk of short circuit in the battery on one hand, and on the other hand, the taking-out operation of the counter electrode 2 is simpler and more convenient.
Preferably, the first tab 10 is an aluminum tab and the second tab 20 is a nickel or copper plated nickel tab.
Preferably, the counter electrode 2 is a lithium sheet.
Optionally, the counter electrode 2 is graphite or a lithium-containing compound. If the working electrode 1 is made of lithium source-containing materials such as nickel cobalt lithium manganate, the counter electrode 2 can be made of materials such as graphite, lithium sheets and lithium-containing compounds. If the working electrode 1 is made of a material having no lithium source such as graphite, the counter electrode 2 needs to be made of a material such as a lithium sheet or a lithium-containing compound.
In this embodiment, two working electrodes 1 are all taken from the same batch, and the two are the same in size, and are arranged outside the first membrane bag 3 in mirror symmetry with respect to the counter electrode 2, and mirror symmetry arrangement specifically means: the projections of the two working electrodes 1 in the horizontal direction coincide completely. Meanwhile, the size of the counter electrode 2 is larger than the sizes of the two working electrodes 1, and both the two working electrodes 1 are completely within the area range of the counter electrode 2. On one hand, the working electrode 1 is kept consistent, so that the electrode of the symmetrical battery has good symmetry, and the electrochemical test result is more accurate and reliable; on the other hand, the counter electrode 2 can be ensured to have enough capacity for accommodating lithium ions, so that lithium ions are prevented from being separated out to form lithium dendrites when the surface of the counter electrode 2 is subjected to reduction reaction in the charging process, and further the diaphragms are pierced to cause short circuit in the symmetrical battery.
In this embodiment, since the counter electrode 2 needs to be removed from the aluminum-plastic film 5 after the two working electrodes 1 are adjusted to the target SOC state, the second tab 20 and the two first tabs 10 are led out from different sides, and the taking-out operation can be completed by only cutting off the aluminum-plastic film on one side of the second tab 20, which is time-saving and labor-saving.
In other embodiments, the two first tabs 10 can also be led out from the same side of the aluminum plastic film 5, and the second tab 20 is led out from the adjacent side or the opposite side of the two first tabs 10.
In this embodiment, tab glue is disposed at the joint of the two first tabs 10 and the second tabs 20 and the edge of the aluminum-plastic film 5, so as to facilitate the packaging operation of the aluminum-plastic film 5 and avoid short circuit caused by contact between the two first tabs 10 and the metal layer in the aluminum-plastic film 5 and the two second tabs 20.
In this embodiment, symmetrical batteries in different SOC states under the same number of charge and discharge cycles may be prepared, or symmetrical batteries in the same SOC state under different number of charge and discharge cycles may be prepared, so as to sufficiently test the electrode performance.
Example two
This embodiment simplifies the manufacturing method based on the first embodiment by eliminating the second separator bag 4 and placing the counter electrode 2 directly in the first separator bag 3. After the two working electrodes 1 are adjusted to the target SOC state, the aluminum-plastic film on one side of the second lug 20 is cut off, the counter electrode 2 is taken out from the aluminum-plastic film 5, and other manufacturing methods are not changed.
EXAMPLE III
In this embodiment, the membrane bag in the first embodiment or the second embodiment is replaced by a membrane sheet, and the membrane sheet is folded at least once, so that the counter electrode 2 and the two working electrodes 1 are separated by at least one membrane.
Optionally, the diaphragm is folded into an M shape, so that the counter electrode 2 is separated from the two working electrodes 1 by two layers of diaphragms.
Example four
The symmetrical battery manufactured by the manufacturing method of the symmetrical battery in any embodiment is formed by soaking electrodes consisting of two same-polarity pole pieces in an aluminum-plastic film container filled with electrolyte, the electrodes are isolated by a diaphragm, and the pole lugs of the electrodes extend to the outside of the aluminum-plastic film. The symmetrical battery of this embodiment utilizes the characteristics that the plastic-aluminum membrane can be tailor, easy encapsulation, through this design of "symmetrical electrode that can remove", has not only simplified the manufacture process of symmetrical battery greatly, makes the electrode be in the electrolyte environment all the time simultaneously, has avoided adverse external environment's influence, has guaranteed the stability of electrode nature to the at utmost, makes the follow-up electrochemistry test structure of going on more accurate reliable.
Reference throughout this specification to the description of the terms "preferred," "optional," or the like, as used in describing preferred embodiments of the present invention, means that a particular feature, structure, material, or characteristic described in connection with the example or illustration is included in at least one example or illustration of the present invention. 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.
The above examples are only intended to illustrate the details of the invention, which is not limited to the above details, i.e. it is not intended that the invention must be implemented in such detail. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (8)
1. A manufacturing method of a symmetrical battery is characterized by comprising the following steps:
s10, providing two same-polarity electrodes as working electrodes, and enabling the two working electrodes to be respectively welded with a first tab;
s20, providing a counter electrode, and enabling the counter electrode to be welded with the second pole ear;
s30, providing an aluminum-plastic film, wherein the aluminum-plastic film is provided with a containing cavity formed by punching, so that the working electrode and the counter electrode are both arranged in the containing cavity, the counter electrode is arranged between the two working electrodes, a diaphragm is arranged between the working electrode and the counter electrode, so that the first tab and the second tab are both led out of the aluminum-plastic film, the second tab and the two first tabs are led out from different sides of the aluminum-plastic film, the two first tabs are respectively led out from two opposite sides of the aluminum-plastic film, and the leading-out direction of the second tab is vertical to the leading-out direction of the two first tabs;
s40, packaging the aluminum plastic film, and sealing after injecting electrolyte;
s50, performing charge and discharge operation to enable the two working electrodes to reach a target SOC state;
and S60, separating the counter electrode from the aluminum plastic film, and sealing again to obtain the symmetrical battery.
2. The method of claim 1, wherein the two working electrodes are the same size and are arranged mirror-symmetrically about the counter electrode.
3. The method of claim 2, wherein the counter electrode size is greater than the two working electrode sizes such that the two working electrodes are entirely within the area of the counter electrode.
4. The method of claim 1, wherein the separators on opposite sides of the counter electrode collectively form a separator bag encasing the counter electrode.
5. The method of claim 4, wherein the separator bag comprises at least one layer.
6. The method for manufacturing a symmetrical battery according to claim 1, wherein the step S50 specifically comprises the steps of:
s510, connecting the two first lugs to the positive electrode of a power supply, and connecting the second lug to the negative electrode of the power supply;
and S520, performing charging and discharging operation to enable the two working electrodes to reach a target SOC state.
7. The method of claim 6, wherein both of the working electrodes undergo at least one charge-discharge cycle before reaching a target SOC state.
8. A symmetrical battery, wherein the symmetrical battery is manufactured according to the method of any one of claims 1 to 7.
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| CN201811563769.9A CN109585932B (en) | 2018-12-20 | 2018-12-20 | Manufacturing method of symmetrical battery and symmetrical battery |
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| CN201811563769.9A CN109585932B (en) | 2018-12-20 | 2018-12-20 | Manufacturing method of symmetrical battery and symmetrical battery |
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| CN109585932B true CN109585932B (en) | 2021-06-29 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111009688B (en) * | 2019-11-12 | 2023-02-21 | 浙江锋锂新能源科技有限公司 | Novel adjustable SOC symmetrical battery and preparation method thereof |
| CN113138345B (en) * | 2021-03-22 | 2023-08-15 | 万向一二三股份公司 | Method for evaluating performance of lithium ion battery by using symmetrical battery |
| CN113078374A (en) * | 2021-03-25 | 2021-07-06 | 湖南美尼科技有限公司 | Symmetric battery and test method |
| CN114114042A (en) * | 2021-10-21 | 2022-03-01 | 合肥国轩高科动力能源有限公司 | Method capable of separately representing impedance of positive electrode and negative electrode in full battery |
| CN114236239B (en) * | 2021-12-15 | 2024-02-02 | 湖北亿纬动力有限公司 | Testing device and testing method for ion conductivity of diaphragm |
| CN114824663B (en) * | 2022-07-01 | 2022-09-02 | 河南锂动电源有限公司 | Preparation method of symmetrical battery and symmetrical battery |
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| JP4283951B2 (en) * | 1999-10-08 | 2009-06-24 | パナソニック株式会社 | Sealed prismatic battery |
| US20090123846A1 (en) * | 2007-11-12 | 2009-05-14 | Kyushu University | All-solid-state cell |
| CN203774410U (en) * | 2014-03-18 | 2014-08-13 | 惠州亿纬锂能股份有限公司 | Lithium ion battery formation cabinet |
| US20180074345A1 (en) * | 2016-09-12 | 2018-03-15 | Johnson & Johnson Vision Care, Inc. | Clam shell form biomedical device batteries |
| CN108508067A (en) * | 2018-02-11 | 2018-09-07 | 多氟多（焦作）新能源科技有限公司 | A method of evaluating the battery material of lithium ion battery using Symmetrical cells |
| CN109560245B (en) * | 2018-10-18 | 2020-05-12 | 欣旺达电子股份有限公司 | Symmetrical battery and preparation method thereof |
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