CN113764743A - Method for reducing gas generation bulge of soft package lithium ion battery and soft package lithium ion battery - Google Patents
Method for reducing gas generation bulge of soft package lithium ion battery and soft package lithium ion battery Download PDFInfo
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- CN113764743A CN113764743A CN202111131433.7A CN202111131433A CN113764743A CN 113764743 A CN113764743 A CN 113764743A CN 202111131433 A CN202111131433 A CN 202111131433A CN 113764743 A CN113764743 A CN 113764743A
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- lithium ion
- ion battery
- package lithium
- soft package
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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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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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
Abstract
The invention discloses a method for reducing gas generation bulges of a soft package lithium ion battery and the soft package lithium ion battery, wherein the method comprises the following steps: s1, standing the liquid-injected soft package lithium ion battery to enable a pole piece, a diaphragm and electrolyte of the soft package lithium ion battery to be fully soaked; s2, carrying out chemical composition and volume grading treatment on the soft package lithium ion battery; s3, carrying out shallow cycle charge and discharge treatment on the soft package lithium ion battery; s4, measuring a first open circuit voltage of the soft package lithium ion battery; s5, carrying out high-temperature aging treatment on the soft package lithium ion battery; s6, measuring a second open circuit voltage of the soft package lithium ion battery; s7, performing air extraction and secondary sealing treatment on the soft package lithium ion battery; the invention can effectively solve the problem of the traditional method that the soft package lithium ion battery is blown out due to gas generation in the following stage of capacity grading, shallow cycle charging and discharging, high temperature aging and the like because the air is immediately exhausted and sealed after the formation stage.
Description
Technical Field
The invention relates to the technical field of lithium ion battery manufacturing, in particular to a method for reducing gas generation bulges of a soft package lithium ion battery and the soft package lithium ion battery.
Background
The soft package lithium ion battery has the characteristics of high energy density, long storage time, small volume, more recycling times and the like, and is widely applied to a plurality of fields of electric automobiles and the like. Before the soft package lithium ion battery leaves a factory, the soft package lithium ion battery needs to be charged and discharged for the first time, and gases such as hydrogen, ethylene, carbon monoxide and the like can be released in the process of charging and discharging for the first time, so that the soft package lithium ion battery bulges due to gas generation, and the use of the soft package lithium ion battery is seriously influenced. Therefore, it is necessary to perform degassing treatment before shipment of the soft package lithium ion battery. In the prior art, air extraction and sealing operations are mainly performed immediately after the formation stage of the soft package lithium ion battery.
However, the soft package lithium ion battery can generate gas in the formation stage, and also can generate gas in the charging and discharging and high-temperature aging stages several times before and after the formation, and the existing air draft sealing operation can only solve the problem that the bulge is caused by gas generation in the formation stage, and can not completely remove the bulge caused by gas generation in other stages after the formation stage.
Disclosure of Invention
The invention aims to provide a method for reducing gas generation bulge of a soft package lithium ion battery and the soft package lithium ion battery, which can effectively solve the problem of bulge of the soft package lithium ion battery caused by gas generation in the conventional method because the subsequent capacity grading stage, the shallow cycle charge and discharge stage, the high-temperature aging stage and the like are omitted because the gas is immediately pumped out and sealed after the formation stage.
In order to achieve the aim, the invention discloses a method for reducing gas generation bulges of a soft package lithium ion battery, which comprises the following steps:
s1, standing the liquid-injected soft package lithium ion battery to enable a pole piece, a diaphragm and electrolyte of the soft package lithium ion battery to be fully soaked;
s2, carrying out chemical composition and volume grading treatment on the soft package lithium ion battery;
s3, carrying out shallow cycle charge and discharge treatment on the soft package lithium ion battery;
s4, measuring a first open circuit voltage of the soft package lithium ion battery;
s5, carrying out high-temperature aging treatment on the soft package lithium ion battery;
s6, measuring a second open circuit voltage of the soft package lithium ion battery;
and S7, performing air extraction and secondary sealing treatment on the soft package lithium ion battery.
Preferably, the step S1 specifically includes:
s11, standing the liquid-injected soft package lithium ion battery at normal temperature for a first preset time;
and S12, standing the soft package lithium ion battery at a first preset temperature for a second preset time to enable the pole piece, the diaphragm and the electrolyte of the soft package lithium ion battery to be fully soaked.
Preferably, the step S2 specifically includes:
s21, placing the soft package lithium ion battery which is fully soaked into formation equipment for formation treatment so as to enable the soft package lithium ion battery to be in a full-charge state;
s22, after the soft package lithium ion battery is subjected to constant current discharge to a first preset voltage by a first preset current, measuring the cell capacity of the soft package lithium ion battery;
and S23, carrying out capacity grading treatment on the soft package lithium ion battery according to the battery cell capacity of the soft package lithium ion battery.
Specifically, the step S21 specifically includes:
s211, placing the soft package lithium ion battery which is fully soaked into formation equipment;
s212, charging the soft package lithium ion battery to a second preset voltage at a second preset current in a constant current manner;
s213, charging the soft package lithium ion battery to a third preset voltage at a third preset current in a constant current manner;
s214, standing the soft package lithium ion battery for a third preset time;
and S215, charging the soft package lithium ion battery to a fourth preset voltage at a constant current and a constant voltage by using a fourth preset current so as to enable the cutoff current of the soft package lithium ion battery to be a preset cutoff current.
Preferably, the step S3 specifically includes:
s31, charging the soft package lithium ion battery to a fifth preset voltage at a fifth preset current in a constant current manner;
s32, discharging the soft package lithium ion battery to a sixth preset voltage at a sixth preset current in a constant current manner;
the above steps S31 to S32 are repeated a preset number of times.
Preferably, after the step S3 and before the step S4, the method further includes:
s301, standing the soft package lithium ion battery at a second preset temperature for a fourth preset time.
Preferably, the step S5 specifically includes:
and S51, standing the soft package lithium ion battery at a third preset temperature for a fifth preset time.
Preferably, the step S7 specifically includes:
s71, performing air extraction treatment on the soft package lithium ion battery;
and S72, carrying out secondary sealing treatment on the soft package lithium ion battery.
Preferably, the step S1 is preceded by:
s101, performing liquid injection treatment on the soft package lithium ion battery;
and S102, carrying out primary sealing treatment on the soft package lithium ion battery.
Correspondingly, the invention also discloses a soft package lithium ion battery which is prepared by the method for reducing the gas generation bulge of the soft package lithium ion battery.
Compared with the prior art, the invention arranges the air exhaust secondary seal after the second open-circuit voltage measurement of the soft package lithium ion battery, so as to exhaust the gas generated in the formation stage, the capacity grading stage, the shallow cycle charge-discharge stage, the high-temperature aging stage and the like at one time and seal the gas, thereby effectively solving the problem of the soft package lithium ion battery bulging caused by gas generation in the subsequent capacity grading stage, the shallow cycle charge-discharge stage, the high-temperature aging stage and the like because the air exhaust sealing is immediately performed after the formation stage in the traditional method.
Drawings
Fig. 1 is a flow chart of a method for reducing gassing bulges of a soft package lithium ion battery according to the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the soft-package lithium ion battery of the embodiment is manufactured by a method for reducing gas generation bulges of the soft-package lithium ion battery, and the method for reducing the gas generation bulges of the soft-package lithium ion battery includes the following steps:
s1, standing the liquid-injected soft package lithium ion battery to enable a pole piece, a diaphragm and electrolyte of the soft package lithium ion battery to be fully soaked;
s2, carrying out chemical composition and volume grading treatment on the soft package lithium ion battery;
s3, carrying out shallow cycle charge and discharge treatment on the soft package lithium ion battery;
s4, measuring a first open circuit voltage of the soft package lithium ion battery;
s5, carrying out high-temperature aging treatment on the soft package lithium ion battery;
s6, measuring a second open circuit voltage of the soft package lithium ion battery;
and S7, performing air extraction and secondary sealing treatment on the soft package lithium ion battery.
It can be understood that the soft package lithium ion battery is subjected to two open-circuit voltage tests in stages, so that defective products are removed through the voltage difference of the two open-circuit voltages. Of course, if the difference between the open-circuit voltage measured at a single time and the preset measurement standard is larger, the method can also be used as a principle of defective product rejection.
Preferably, the step S1 specifically includes:
and S11, standing the liquid-injected soft package lithium ion battery at normal temperature for a first preset time.
Preferably, the first predetermined time is between 23 hours and 25 hours, and preferably, the first predetermined time is 24 hours.
And S12, standing the soft package lithium ion battery at a first preset temperature for a second preset time to enable the pole piece, the diaphragm and the electrolyte of the soft package lithium ion battery to be fully soaked.
Preferably, the first predetermined temperature is between 40 ℃ and 50 ℃, and preferably, the first predetermined temperature is 45 ℃.
The second predetermined time is between 11 hours and 25 hours, preferably between 12 hours and 24 hours.
Preferably, the step S2 specifically includes:
and S21, placing the fully soaked soft package lithium ion battery into formation equipment for formation treatment so as to enable the soft package lithium ion battery to be in a full-charge state.
And S22, after the soft package lithium ion battery is subjected to constant current discharge to a first preset voltage by a first preset current, measuring the cell capacity of the soft package lithium ion battery.
Preferably, the first predetermined current is 0.4C to 0.6C of the nominal capacity of the soft package lithium ion battery, and preferably, the first predetermined current is 0.5C of the nominal capacity of the soft package lithium ion battery.
The first predetermined voltage is between 2.9V and 3.1V, and preferably, the first predetermined voltage is 3.0V.
And S23, carrying out capacity grading treatment on the soft package lithium ion battery according to the battery cell capacity of the soft package lithium ion battery. The cell capacity of the soft package lithium ion battery can be accurately measured through the steps, so that the capacity grading accuracy is improved.
Specifically, the step S21 specifically includes:
s211, placing the fully soaked soft package lithium ion battery into formation equipment.
And S212, charging the soft package lithium ion battery to a second preset voltage at a second preset current in a constant current manner.
Preferably, the second predetermined current is 0.09C to 0.11C of the nominal capacity of the soft pack lithium ion battery, and preferably, the second predetermined current is 0.1C of the nominal capacity of the soft pack lithium ion battery.
The second predetermined voltage is between 2.9V and 3.1V, and preferably, the second predetermined voltage is 3.0V.
And S213, charging the soft package lithium ion battery to a third preset voltage at a third preset current in a constant current manner.
Preferably, the third predetermined current is 0.19C to 0.21C of the nominal capacity of the soft pack lithium ion battery, and preferably, the third predetermined current is 0.2C of the nominal capacity of the soft pack lithium ion battery.
The third predetermined voltage is between 3.4V and 3.6V, and preferably, the third predetermined voltage is 3.5V.
S214, standing the soft package lithium ion battery for a third preset time.
Preferably, the third predetermined time is between 4 minutes and 6 minutes, and preferably, the third predetermined time is 5 minutes.
And S215, charging the soft package lithium ion battery to a fourth preset voltage at a constant current and a constant voltage by using a fourth preset current so as to enable the cutoff current of the soft package lithium ion battery to be a preset cutoff current.
Preferably, the fourth predetermined current is 0.4C to 0.6C of the nominal capacity of the soft pack lithium ion battery, and preferably, the fourth predetermined current is 0.5C of the nominal capacity of the soft pack lithium ion battery.
The fourth predetermined voltage is between 4.1V and 4.3V, and preferably, the fourth predetermined voltage is 4.2V.
The preset cut-off current is between 0.01C and 0.03C of the nominal capacity of the soft package lithium ion battery, and preferably, the preset cut-off current is 0.02C of the nominal capacity of the soft package lithium ion battery.
Preferably, the step S3 specifically includes:
and S31, charging the soft package lithium ion battery to a fifth preset voltage at a fifth preset current in a constant current manner.
Preferably, the fifth predetermined current is 0.4C to 0.6C of the nominal capacity of the soft pack lithium ion battery, and preferably, the fifth predetermined current is 0.5C of the nominal capacity of the soft pack lithium ion battery.
The fifth predetermined voltage is between 3.7V and 3.9V, and preferably, the fifth predetermined voltage is 3.8V.
And S32, discharging the soft package lithium ion battery to a sixth preset voltage at a sixth preset current in a constant current manner.
Preferably, the sixth predetermined current is 0.4C to 0.6C of the nominal capacity of the soft pack lithium ion battery, and preferably, the sixth predetermined current is 0.5C of the nominal capacity of the soft pack lithium ion battery.
The sixth predetermined voltage is between 2.9V and 3.1V, and preferably, the sixth predetermined voltage is 3.0V.
The above steps S31 to S32 are repeated a preset number of times. Through multiple experiments, the shallow-cycle charge and discharge requirements of the soft package lithium ion battery can be met by repeating the steps S31 to S32 once.
Preferably, after the step S3 and before the step S4, the method further includes:
s301, standing the soft package lithium ion battery at a second preset temperature for a fourth preset time.
Preferably, the second predetermined temperature is between 20 ℃ and 30 ℃, and preferably, the second predetermined temperature is 25 ℃.
The fourth predetermined time is between 47 hours and 49 hours, preferably 48 hours.
Preferably, the step S5 specifically includes:
and S51, standing the soft package lithium ion battery at a third preset temperature for a fifth preset time.
Preferably, the third predetermined temperature is between 40 ℃ and 50 ℃, and preferably, the third predetermined temperature is 45 ℃.
The fifth predetermined time is between 71 hours and 73 hours, preferably, the fifth predetermined time is 72 hours.
Preferably, the step S7 specifically includes:
and S71, performing air extraction treatment on the soft package lithium ion battery.
Specifically, the air bag of the soft package lithium ion battery is punctured by air extraction equipment for air extraction treatment.
And S72, carrying out secondary sealing treatment on the soft package lithium ion battery.
Specifically, the air bag of the soft package lithium ion battery is sealed through a sealing device.
Preferably, the step S1 is preceded by:
and S101, performing liquid injection treatment on the soft package lithium ion battery.
Specifically, liquid injection treatment is carried out on the soft package lithium ion battery through liquid injection equipment.
And S102, carrying out primary sealing treatment on the soft package lithium ion battery.
Specifically, the soft package lithium ion battery is sealed through a sealing device.
With reference to fig. 1, the present invention arranges a pumping secondary seal after the second open-circuit voltage measurement of the soft-package lithium ion battery, so as to pump away the gas generated in the formation stage, the capacity grading stage, the shallow cycle charge-discharge stage, the high-temperature aging stage, and the like, and effectively solve the problem of the soft-package lithium ion battery bulging caused by gas generation in the subsequent capacity grading stage, the shallow cycle charge-discharge stage, the high-temperature aging stage, and the like, because the gas is pumped out immediately after the formation stage and sealed.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A method for reducing gas generation bulges of a soft package lithium ion battery is characterized by comprising the following steps:
standing the liquid-injected soft package lithium ion battery to enable a pole piece, a diaphragm and electrolyte of the soft package lithium ion battery to be fully soaked;
carrying out formation and capacity grading treatment on the soft package lithium ion battery;
carrying out shallow-cycle charge and discharge treatment on the soft package lithium ion battery;
measuring a first open-circuit voltage of the soft package lithium ion battery;
carrying out high-temperature aging treatment on the soft package lithium ion battery;
measuring a second open-circuit voltage of the soft package lithium ion battery;
and performing air exhaust secondary sealing treatment on the soft package lithium ion battery.
2. The method for reducing the gassing swell of the soft-package lithium ion battery according to claim 1, wherein the soft-package lithium ion battery after being injected with the liquid is subjected to standing treatment so as to enable a pole piece, a diaphragm and an electrolyte of the soft-package lithium ion battery to be fully infiltrated, and specifically comprises the following steps:
standing the liquid-injected soft package lithium ion battery at normal temperature for a first preset time;
and standing the soft package lithium ion battery at a first preset temperature for a second preset time to enable the pole piece, the diaphragm and the electrolyte of the soft package lithium ion battery to be fully soaked.
3. The method for reducing gassing bulges of a soft package lithium ion battery according to claim 1, wherein said subjecting said soft package lithium ion battery to a chemical composition and volume treatment comprises:
placing the fully soaked soft package lithium ion battery into formation equipment for formation treatment so as to enable the soft package lithium ion battery to be in a full-charge state;
after the soft package lithium ion battery is subjected to constant current discharge to a first preset voltage at a first preset current, measuring the cell capacity of the soft package lithium ion battery;
and carrying out capacity grading treatment on the soft package lithium ion battery according to the battery cell capacity of the soft package lithium ion battery.
4. The method for reducing gassing bulges of a soft package lithium ion battery according to claim 3, wherein said placing said soft package lithium ion battery that is sufficiently soaked into a formation equipment for a formation treatment comprises:
placing the fully soaked soft package lithium ion battery into formation equipment;
charging the soft package lithium ion battery to a second preset voltage at a second preset current in a constant current manner;
charging the soft package lithium ion battery to a third preset voltage at a third preset current in a constant current manner;
standing the soft package lithium ion battery for a third preset time;
and charging the soft package lithium ion battery to a fourth preset voltage at a constant current and a constant voltage by using a fourth preset current so as to enable the cutoff current of the soft package lithium ion battery to be a preset cutoff current.
5. The method for reducing gassing bulges in a soft-pack lithium ion battery according to claim 1, wherein the performing of the shallow cycle charge-discharge treatment on the soft-pack lithium ion battery comprises:
charging the soft package lithium ion battery to a fifth preset voltage at a fifth preset current in a constant current manner;
discharging the soft package lithium ion battery to a sixth preset voltage at a sixth preset current in a constant current manner;
and repeating the steps for preset times.
6. The method for reducing gassing swell of a soft-pack lithium ion battery according to claim 1, further comprising, after said subjecting said soft-pack lithium ion battery to a shallow cycle charge-discharge treatment and before said measuring a first open circuit voltage of said soft-pack lithium ion battery:
and standing the soft package lithium ion battery at a second preset temperature for a fourth preset time.
7. The method for reducing gassing bulges in a soft-pack lithium ion battery according to claim 1, wherein said subjecting said soft-pack lithium ion battery to a high temperature aging process comprises:
and standing the soft package lithium ion battery at a third preset temperature for a fifth preset time.
8. The method for reducing gassing swell of a soft pack lithium ion battery according to claim 1, wherein said subjecting said soft pack lithium ion battery to a secondary air-extraction process comprises:
carrying out air extraction treatment on the soft package lithium ion battery;
and carrying out secondary sealing treatment on the soft package lithium ion battery.
9. The method for reducing gassing bulges of a soft-package lithium ion battery according to claim 1, wherein the soft-package lithium ion battery after liquid injection is subjected to standing treatment so that a pole piece, a diaphragm and an electrolyte of the soft-package lithium ion battery are fully infiltrated, and the method further comprises the following steps:
carrying out liquid injection treatment on the soft package lithium ion battery;
and carrying out primary sealing treatment on the soft package lithium ion battery.
10. A soft-packed lithium ion battery, characterized by being prepared by the method for reducing gassing of the soft-packed lithium ion battery according to any one of claims 1 to 9.
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