CN103887564B - A kind of fluid injection Activiation method of electrokinetic cell - Google Patents
A kind of fluid injection Activiation method of electrokinetic cell Download PDFInfo
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- CN103887564B CN103887564B CN201210558933.3A CN201210558933A CN103887564B CN 103887564 B CN103887564 B CN 103887564B CN 201210558933 A CN201210558933 A CN 201210558933A CN 103887564 B CN103887564 B CN 103887564B
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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
- H01M10/42—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
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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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Abstract
The present invention proposes a kind of fluid injection Activiation method of electrokinetic cell, comprising: carry out first time electrolyte injection to electrokinetic cell; In the first Preset Time, first time activating charge is carried out to electrokinetic cell with the first predetermined current; Electrokinetic cell is left standstill the second Preset Time, and wherein, the second Preset Time is greater than the first Preset Time; Carry out second time activating charge to electrokinetic cell, second time activating charge is pulse constant current constant voltage charge, and wherein, the charging current of second time activating charge is less than the first predetermined current, and the charging interval of second time activating charge is greater than the first Preset Time; And second time electrolyte is carried out to electrokinetic cell be injected into full.The present invention can form stable fine and close solid electrolyte interface film on battery plus-negative plate plate material surface, effectively improve ferric phosphate electrokinetic cell performance, reduce electric liquid loss simultaneously, improve the operating environment of fluid injection operation, and there is simple to operate, safe and reliable advantage.
Description
Technical field
The present invention relates to technical field of lithium batteries, be specifically related to a kind of fluid injection Activiation method of electrokinetic cell.
Background technology
The features such as voltage is high owing to having for lithium ion secondary power battery, energy density is large, memory-less effect and green non-pollution, in recent years on the equipment such as extensive use electric tool and electric automobile.
In the production process of lithium ion secondary power battery, it is wherein very important technological operation that battery core fluid injection activates, after electrokinetic cell has assembled, electrolyte is injected to battery, and charging is carried out to battery after fluid injection activate, then extract the gas of generation out and vacuum seal, fluid injection is that electric liquid is injected battery, electrolyte fully infiltrates battery diaphragm, positive and negative pole material, as lithium-ion electric stream transmission medium in battery charge and discharge process.Activation uses charge and discharge system to activate lithium ion battery plus-negative plate material, makes battery core both positive and negative polarity polar board surface form one deck densification, even, stable SEI film (SolidElectrolyteInterface, solid electrolyte interface film).Lithium ion battery is in initial charge process, lithium ion and organic electrolyte react in the solid liquid interface of cell negative electrode material and electrolyte, at the thin layer of Surface Creation one deck densification of negative material, this thin layer is that lithium ion enters the ion channel of negative material from electrolyte, the performance of the fine or not direct relation lithium ion battery that SEI film is formed.Therefore SEI film formed quality, stability, interface optimization be determine the very important key factor of battery life.Thus the fluid injection activation of lithium ion battery is the committed step of connection-related electricity use tankage, self-discharge performance, cycle performance and security performance.The quality of battery core fluid injection activation technology directly has influence on the formational situation of battery SEI film, thus has influence on the chemical property of battery.
What current ferric phosphate lithium cell adopted is after a fluid injection completes, and standing a period of time re-uses small area analysis preliminary filling mode, the fluid injection that traditional approach uses, the mode once filling electric liquid can cause electric liquid in the fabrication process to be contacted with air for a long time by liquid injection hole, moisture in air is absorbed in electric liquid, moisture can cause electrolytic salt in electric liquid to decomposite hydrogen fluoride (HF), the positive and negative pole material of HF and battery pole plates reacts, the SEI film formed in infringement activation, worsen battery performance, infringement battery, once fill the gas that too much electric liquid early can be generated in activation to take out of simultaneously, electric liquid is caused to waste, increase manufacturing cost, the HF acid volatilization that electric liquid dissolves and electrolytic salt hydrolysis is formed simultaneously in atmosphere, work the mischief to operating personnel are healthy.Simultaneously for a long time small area analysis constant current charge SEI film poor stability in the process of the follow-up use of electrokinetic cell that can be formed, the battery consistency produced in enormous quantities is not high, cause Vehicular dynamic battery power density, energy density recycle in process decay too fast, simultaneously unstable in recycling SEI film can react repeatedly with battery plus-negative plate material, cause the decomposition of organic principle in electric liquid, produce gas simultaneously, inner pressure of battery is caused to raise, battery bulging, also battery continuation use can be embedded in potential safety hazard.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to propose a kind of fluid injection Activiation method with simple to operate, safe and reliable electrokinetic cell.
According to the fluid injection Activiation method of the electrokinetic cell of the embodiment of the present invention, comprising: first time electrolyte injection is carried out to described electrokinetic cell; In the first Preset Time, first time activating charge is carried out to described electrokinetic cell with the first predetermined current; Described electrokinetic cell is left standstill the second Preset Time, and wherein, described second Preset Time is greater than described first Preset Time; Second time activating charge is carried out to described electrokinetic cell, described second time activating charge is pulse constant current constant voltage charge, wherein, the charging current of described second time activating charge is less than described first predetermined current, and the charging interval of described second time activating charge is greater than described first Preset Time; And second time electrolyte is carried out to described electrokinetic cell be injected into full.
Further, the amount of described first time electrolyte injection is the 50-80% of total electrolyte injection rate.
Further, described first predetermined current is 0.4-0.8C.
Further, described first Preset Time is 10-60S.
Further, described second Preset Time is 1-5h.
Further, describedly second time activating charge is carried out to described electrokinetic cell comprise further: with the second predetermined current, activating charge is carried out with by described power battery charging to the first predeterminated voltage to described electrokinetic cell, and described electrokinetic cell meets first pre-conditioned under described first predeterminated voltage; Described electrokinetic cell is left standstill the 3rd Preset Time; With the 3rd predetermined current, activating charge is carried out with by described power battery charging to the second predeterminated voltage to described electrokinetic cell, and described electrokinetic cell meets second pre-conditioned under described second predeterminated voltage, wherein, described second predeterminated voltage is greater than described first predeterminated voltage, and described 3rd predetermined current is greater than described second predetermined current; Described electrokinetic cell is left standstill the 4th Preset Time; With the 4th predetermined current to described electrokinetic cell carry out activating charge with by described power battery charging to the 3rd predeterminated voltage, and described electrokinetic cell meets the 3rd pre-conditioned under described 3rd predeterminated voltage, wherein, described 3rd predeterminated voltage is greater than described second predeterminated voltage, and described 4th predetermined current is greater than described 3rd predetermined current; And described electrokinetic cell is left standstill the 5th Preset Time.
Further, described 3rd Preset Time, the 4th Preset Time are identical with the 5th Preset Time.
Further, described first predetermined current is 0.01-0.1C, and described second predetermined current is 0.1-0.3C, and described 3rd predetermined current is 0.3-0.6C.
Further, described first predeterminated voltage is 1.3-1.6V, and described second predeterminated voltage is 2.8-3.2V, and described 3rd predeterminated voltage is 3.2-3.6V.
Further, described first pre-conditioned be under described first predeterminated voltage, the electric current of described electrokinetic cell reached for the first charging interval of presetting Limited Current or described electrokinetic cell and reaches first and preset binding hours; Described second pre-conditioned be under described second predeterminated voltage, the electric current of described electrokinetic cell reached for the second charging interval of presetting Limited Current or described electrokinetic cell and reaches second and preset binding hours; And described 3rd pre-conditioned be under described 3rd predeterminated voltage, the electric current of described electrokinetic cell reached for the 3rd charging interval of presetting Limited Current or described electrokinetic cell and reaches the 3rd and preset binding hours;
Further, the described first default Limited Current is 0.001-0.01C, and the described second default Limited Current is 0.01-0.1C, and the described 3rd default Limited Current is 0.01-0.1C.
Further, it is identical that described first presets binding hours, the described second default binding hours and the described 3rd presets binding hours.
The invention has the advantages that and can form stable fine and close SEI film on battery plus-negative plate plate material surface, effectively improve the rate of decay of the power density of ferric phosphate electrokinetic cell in cyclic process, energy density, circulation volume, security performance, promote the consistency of electrokinetic cell; Reduce the loss in the fabrication process of electric liquid simultaneously, improve the operating environment of fluid injection operation, while reducing manufacturing cost, strengthen the protection of operating personnel's personal safety; And the present invention is simple to operate, reliability is high, is particularly useful for lithium iron phosphate battery for electric automobile, can be applicable.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the flow chart of the fluid injection Activiation method of the electrokinetic cell of the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature immediately below second feature and tiltedly below, or only represent that fisrt feature level height is less than second feature.
Fig. 1 is the flow chart of the fluid injection Activiation method of the electrokinetic cell of the embodiment of the present invention.As shown in Figure 1, according to the fluid injection Activiation method of the electrokinetic cell of the embodiment of the present invention, this electrokinetic cell can be ferric phosphate lithium cell or other batteries, and the method comprises the following steps:
Steps A. first time electrolyte injection is carried out to electrokinetic cell.
In one embodiment of the invention, the amount of first time electrolyte injection is the 50-80% of total electrolyte injection rate.
Step B. carries out first time activating charge to electrokinetic cell with the first predetermined current in the first Preset Time.
In one embodiment of the invention, the first predetermined current is 0.4-0.8C, and the first Preset Time is 10-60S.
Electrokinetic cell is left standstill the second Preset Time by step C., and wherein, the second Preset Time is greater than the first Preset Time.
In one embodiment of the invention, the second Preset Time is 1-5h.
Step D. carries out second time activating charge to electrokinetic cell, and second time activating charge is pulse constant current constant voltage charge, and wherein, the charging current of second time activating charge is less than the first predetermined current, and the charging interval of second time activating charge is greater than the first Preset Time.
In one embodiment of the invention, step D comprises further: step D1. carries out activating charge with by power battery charging to the first predeterminated voltage with the second predetermined current to electrokinetic cell, and electrokinetic cell meets first pre-conditioned under the first predeterminated voltage; Electrokinetic cell is left standstill the 3rd Preset Time by step D2.; Step D3. carries out activating charge with by power battery charging to the second predeterminated voltage with the 3rd predetermined current to electrokinetic cell, and electrokinetic cell meets second pre-conditioned under the second predeterminated voltage, wherein, second predeterminated voltage is greater than the first predeterminated voltage, and the 3rd predetermined current is greater than the second predetermined current; Electrokinetic cell is left standstill the 4th Preset Time by step D4.; Step D5. with the 4th predetermined current to electrokinetic cell carry out activating charge with by power battery charging to the 3rd predeterminated voltage, and electrokinetic cell meets the 3rd pre-conditioned under the 3rd predeterminated voltage, wherein, 3rd predeterminated voltage is greater than the second predeterminated voltage, and the 4th predetermined current is greater than the 3rd predetermined current; Step D6. and by electrokinetic cell leave standstill the 5th Preset Time.
In one embodiment of the invention, the 3rd Preset Time, the 4th Preset Time are identical with the 5th Preset Time.
In one embodiment of the invention, the first predetermined current is 0.01-0.1C, and the second predetermined current is 0.1-0.3C, and the 3rd predetermined current is 0.3-0.6C.
In one embodiment of the invention, the first predeterminated voltage is 1.3-1.6V, and the second predeterminated voltage is 2.8-3.2V, and the 3rd predeterminated voltage is 3.2-3.6V.
In one embodiment of the invention, first pre-conditioned be under the first predeterminated voltage, the electric current of electrokinetic cell reached for the first charging interval of presetting Limited Current or electrokinetic cell and reaches first and preset binding hours; Second pre-conditioned be under the second predeterminated voltage, the electric current of electrokinetic cell reached for the second charging interval of presetting Limited Current or electrokinetic cell and reaches second and preset binding hours; And the 3rd pre-conditioned be under the 3rd predeterminated voltage, the electric current of electrokinetic cell reached for the 3rd charging interval of presetting Limited Current or electrokinetic cell and reaches the 3rd and preset binding hours;
In one embodiment of the invention, the first default Limited Current is 0.001-0.01C, and the second default Limited Current is 0.01-0.1C, and the 3rd default Limited Current is 0.01-0.1C.
In one embodiment of the invention, it is identical that first presets binding hours, the second default binding hours and the 3rd presets binding hours.
Step e. second time electrolyte is carried out to electrokinetic cell and is injected into full.
For making those skilled in the art understand the present invention better, describe electric core aging method and the effect thereof of lithium rechargeable battery of the present invention in detail below by specific embodiment and comparative example.
It should be noted that, the fluid injection Activiation method of lithium rechargeable battery provided by the present invention is applicable to all LiFePO 4 material batteries.
Embodiment 1:
In the present embodiment, power battery liquid-injection activation is carried out according to the following steps.
S1: the lithium iron phosphate dynamic battery assembled carries out opening fluid injection first, reservoir quantity is 65% of total fluid-injecting amount.
S2: carry out large current charge first immediately by after fluid injection, charging current is 0.4C, time 30S.
S3: by large current charge battery standing 3-4h.
S4: time of repose is arrived, battery carries out secondary activating charging subsequently, and secondary activating is charged as pulse constant voltage charge, and point 3 stages carry out:
In 1st stage, with the charging current of 0.03C, battery is charged, to make cell voltage reach 1.5V, maintain 1.5V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.003C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 30min, stop constant voltage charge.Leave standstill 5min subsequently.
In 2nd stage: battery is charged with the charging current of 0.10C, to make cell voltage reach 3.0V, maintain 3.0V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.01C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 1h, stop constant voltage charge.Leave standstill 5min subsequently.
In 3rd stage: battery is charged with the charging current of 0.4C, to make cell voltage reach 3.3V, maintain 3.3V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.05C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 1h, stop constant voltage charge.
S5: Exhaust Gas is vacuumized to charging complete battery.
S6: carry out fluid injection again to the battery of Exhaust Gas, reservoir quantity is 35% of total fluid-injecting amount.
S7: battery is sealed.
Embodiment 2:
In the present embodiment, power battery liquid-injection activation is carried out according to the following steps.
S1: the lithium iron phosphate dynamic battery assembled carries out opening fluid injection first, reservoir quantity is 75% of total fluid-injecting amount.
S2: carry out large current charge first immediately by after fluid injection, charging current is 0.45C, time 30S.
S3: by large current charge battery standing 3-4h.
S4: time of repose is completed battery and carry out secondary activating charging.Secondary activating is charged as pulse constant voltage charge, and point 3 stages carry out:
In 1st stage, with the charging current of 0.04C, battery is charged, to make cell voltage reach 1.5V, maintain 1.5V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.004C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 30min, stop constant voltage charge.Leave standstill 5min subsequently.
In 2nd stage: battery is charged with the charging current of 0.13C, to make cell voltage reach 3.0V, maintain 3.0V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.01C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 1h, stop constant voltage charge.Leave standstill 5min subsequently.
In 3rd stage: battery is charged with the charging current of 0.45C, to make cell voltage reach 3.3V, maintain 3.3V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.05C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 1h, stop constant voltage charge.
S5: Exhaust Gas is vacuumized to charging complete battery.
S6: carry out fluid injection again to the battery of Exhaust Gas, reservoir quantity is 25% of total fluid-injecting amount.
S7: battery is sealed.
Embodiment 3:
In the present embodiment, power battery liquid-injection activation is carried out according to the following steps.
S1: the lithium iron phosphate dynamic battery assembled carries out opening fluid injection first, reservoir quantity is 80% of total fluid-injecting amount.
S2: carry out large current charge first immediately by after fluid injection, charging current is 0.5C, time 30S.
S3: by large current charge battery standing 3-4h.
S4: time of repose is completed battery and carry out secondary activating charging.Secondary activating is charged as pulse constant voltage charge, and point 3 stages carry out:
In 1st stage, with the charging current of 0.05C, battery is charged, to make cell voltage reach 1.5V, maintain 1.5V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.005C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 30min, stop constant voltage charge.Leave standstill 5min subsequently.
In 2nd stage: battery is charged with the charging current of 0.15C, to make cell voltage reach 3.0V, maintain 3.0V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.01C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 1h, stop constant voltage charge.Leave standstill 5min subsequently.
In 3rd stage: battery is charged with the charging current of 0.5C, to make cell voltage reach 3.3V, maintain 3.3V constant voltage subsequently and continue charging a period of time.Usually, along with battery is full of gradually during constant voltage charge, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to when electric current and stop constant voltage charge after 0.05C.Or, from the timing of constant voltage charge beginning, after more than constant voltage charge 1h, stop constant voltage charge.
S5: Exhaust Gas is vacuumized to charging complete battery.
S6: carry out fluid injection again to the battery of Exhaust Gas, reservoir quantity is 20% of total fluid-injecting amount.
S7: battery is sealed.
Comparative example:
As a comparison, battery battery core fluid injection activation is carried out according to the following steps.
S1: complete battery to assembling and carry out fluid injection, reservoir quantity is 100% of total fluid-injecting amount.
S2: after fluid injection being completed, battery carries out standing 5 hours.
S3: be suitable for traditional step:
First stage: charging current 0.05C, charging interval 60min.
Second stage: charging current 0.2C, charging interval 60min.
S4: vacuumizing and exhausting is carried out to battery.
S5: battery is sealed.
In order to the effect that the battery core fluid injection evaluating each battery activates, after battery core is analyzed, cycle detection is carried out to the battery of the various embodiments described above and comparative example, analyzed capacity attenuation situation in different dynamic circulating battery process; Comparison point is respectively the capacity attenuation of the 100th circulation, the 300th circulation, the 800th circulation time.At room temperature, by battery with 1.0C current charges to 3.65V, shelve 10 minutes, then carry out being discharged to 2.0V with 1.0C electric current, shelve 20 minutes, record initial discharge capacity D1.Repeat previous step and charge and discharge cycles test is carried out to battery, and record each discharge capacity, stop cycle detection when discharge capacity is less than battery initial capacity 80%.Circulate 100 capacity attenuation rate=1-D100/D1; Circulate 300 capacity attenuation rate=1-D300/D1, and circulate 500 capacity attenuation rate=1-D500/D1; D100 represents discharge capacity of the cell during the 100th loop test, and D300 represents discharge capacity of the cell during the 300th loop test, and D800 represents discharge capacity of the cell during the 800th loop test;
The test result of the various embodiments described above and comparative example is shown in table 1.
Table 1 embodiment and comparative example battery performance test result
From the data of upper table, the battery capacity rate of decay adopting the inventive method to carry out fluid injection activation is significantly less than the battery that conventional method manufactures; That is the battery that the electrical property of the battery of battery core fluid injection activation process, security performance, the obvious excellence of cycle life and traditional fluid injection active mode manufacture is carried out according to method of the present invention; This illustrates that adopting the inventive method to control electric core aging process obviously can eliminate the bad side reaction of inside battery, is conducive to stable at cell negative plate Surface Creation, fine and close, uniform SEI film, thus improves the chemical property of battery
And the inventive method manufacturing operation is simple and reliable, be adapted at large-scale application in lithium iron phosphate dynamic battery manufacture process, effectively can promote automobile power cell performance and reduce battery manufacture cost;
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.
Claims (11)
1. a fluid injection Activiation method for electrokinetic cell, is characterized in that, comprising:
First time electrolyte injection is carried out to described electrokinetic cell;
In the first Preset Time, first time activating charge is carried out to described electrokinetic cell with the first predetermined current;
Described electrokinetic cell is left standstill the second Preset Time, and wherein, described second Preset Time is greater than described first Preset Time;
Second time activating charge is carried out to described electrokinetic cell, described second time activating charge is pulse constant current constant voltage charge, wherein, the charging current of described second time activating charge is less than described first predetermined current, and the charging interval of described second time activating charge is greater than described first Preset Time; And
Carrying out second time electrolyte to described electrokinetic cell is injected into full.
2. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, is characterized in that, the amount of described first time electrolyte injection is the 50-80% of total electrolyte injection rate.
3. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, it is characterized in that, described first predetermined current is 0.4-0.8C.
4. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, it is characterized in that, described first Preset Time is 10-60S.
5. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, it is characterized in that, described second Preset Time is 1-5h.
6. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, is characterized in that, describedly carries out second time activating charge to described electrokinetic cell and comprises further:
With the second predetermined current, activating charge is carried out with by described power battery charging to the first predeterminated voltage to described electrokinetic cell, and described electrokinetic cell meets under described first predeterminated voltage first pre-conditioned;
Described electrokinetic cell is left standstill the 3rd Preset Time;
With the 3rd predetermined current, activating charge is carried out with by described power battery charging to the second predeterminated voltage to described electrokinetic cell, and described electrokinetic cell meets second pre-conditioned under described second predeterminated voltage, wherein, described second predeterminated voltage is greater than described first predeterminated voltage, and described 3rd predetermined current is greater than described second predetermined current;
Described electrokinetic cell is left standstill the 4th Preset Time;
With the 4th predetermined current to described electrokinetic cell carry out activating charge with by described power battery charging to the 3rd predeterminated voltage, and described electrokinetic cell meets the 3rd pre-conditioned under described 3rd predeterminated voltage, wherein, described 3rd predeterminated voltage is greater than described second predeterminated voltage, and described 4th predetermined current is greater than described 3rd predetermined current; And
Described electrokinetic cell is left standstill the 5th Preset Time.
7. the fluid injection Activiation method of electrokinetic cell as claimed in claim 6, it is characterized in that, described 3rd Preset Time, the 4th Preset Time are identical with the 5th Preset Time.
8. the fluid injection Activiation method of electrokinetic cell as claimed in claim 6, it is characterized in that, described first predeterminated voltage is 1.3-1.6V, and described second predeterminated voltage is 2.8-3.2V, and described 3rd predeterminated voltage is 3.2-3.6V.
9. the fluid injection Activiation method of electrokinetic cell as claimed in claim 6, is characterized in that,
Described first pre-conditioned be under described first predeterminated voltage, the electric current of described electrokinetic cell reached for the first charging interval of presetting Limited Current or described electrokinetic cell and reaches first and preset binding hours;
Described second pre-conditioned be under described second predeterminated voltage, the electric current of described electrokinetic cell reached for the second charging interval of presetting Limited Current or described electrokinetic cell and reaches second and preset binding hours; And
Described 3rd pre-conditioned be under described 3rd predeterminated voltage, the electric current of described electrokinetic cell reached for the 3rd charging interval of presetting Limited Current or described electrokinetic cell and reaches the 3rd and preset binding hours.
10. the fluid injection Activiation method of electrokinetic cell as claimed in claim 9, is characterized in that, the described first default Limited Current is 0.001-0.01C, and the described second default Limited Current is 0.01-0.1C, and the described 3rd default Limited Current is 0.01-0.1C.
The fluid injection Activiation method of 11. electrokinetic cells as claimed in claim 9, is characterized in that, it is identical that described first presets binding hours, the described second default binding hours and the described 3rd presets binding hours.
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| CN105024098B (en) * | 2015-06-03 | 2017-05-10 | 奇瑞汽车股份有限公司 | Lithium ion battery formation method |
| CN109119589A (en) * | 2018-09-10 | 2019-01-01 | 江西安驰新能源科技有限公司 | A kind of efficient liquid injection process of high specific energy power battery |
| CN114976261A (en) * | 2022-06-02 | 2022-08-30 | 江西巴特威新能源科技有限公司 | High-efficiency formation method of lithium ion battery |
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| CN101872879A (en) * | 2010-06-01 | 2010-10-27 | 奇瑞汽车股份有限公司 | Chemical combination method of lithium-ion recharging battery |
| CN101950815A (en) * | 2010-08-23 | 2011-01-19 | 八叶(厦门)新能源科技有限公司 | Method for forming cylindrical lithium-ion secondary battery |
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