CN103887564A - Method for activating injection liquid in power battery - Google Patents
Method for activating injection liquid in power battery Download PDFInfo
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- CN103887564A CN103887564A CN201210558933.3A CN201210558933A CN103887564A CN 103887564 A CN103887564 A CN 103887564A CN 201210558933 A CN201210558933 A CN 201210558933A CN 103887564 A CN103887564 A CN 103887564A
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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 invention provides a method for activating injection liquid in power battery. The method comprises the following steps: injecting electrolyte into a power battery for the first time; carrying out first activation charging on the power battery with a first preset current within a first preset time; allowing the power battery to stand still for a second preset time, wherein the second preset time is longer than the first preset time; carrying out second activation charging on the power batter with a constant pulse current under a constant voltage, wherein the second current intensity is smaller than the first preset current intensity, and the second activation charging time is longer than the first preset time; and finally injecting electrolyte into the power battery until the power battery is fully filled. The method can form stable and compact solid electrolyte interfacial membrane on the surfaces of positive electrode and negative electrode of a power battery, thus effectively improves the properties of iron phosphate power battery, reduces the electrolyte loss at the same time, improves the operation environment of liquid injection process, and has the advantages of simple operation, reliability, and safety.
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, battery is injected to electrolyte, and to the activation of charging of battery after fluid injection, then extract the gas the vacuum seal that produce out, fluid injection is that electric liquid is injected to battery, electrolyte fully infiltrates battery diaphragm, positive and negative pole material, in battery charge and discharge process, flows transmission medium as lithium-ion electric.Activation is to use 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 (Solid Electrolyte Interface, 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 lithium ion enters negative material ion channel from electrolyte, the performance of the film formed fine or not direct relation lithium ion battery of SEI.Therefore the optimization at the film formed quality of SEI, stability, interface is to determine the very important key factor of battery life.Thereby the fluid injection of lithium ion battery activation 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, thereby has influence on the chemical property of battery.
What at present ferric phosphate lithium cell adopted is after a fluid injection completes, and standing a period of time re-uses little pre-charge mode, the fluid injection that traditional approach uses, the mode that once fills electric liquid can cause electric liquid in manufacture process to contact 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), HF reacts with the positive and negative pole material of battery pole plates, the SEI film forming in infringement activation, worsen battery performance, infringement battery, once fill the gas that too much electric liquid early can be generated in activation takes out of simultaneously, cause electric liquid waste, increase manufacturing cost, the HF acid volatilization that simultaneously electric liquid dissolves and electrolytic salt hydrolysis forms is in air, work the mischief to operating personnel are healthy.SEI film poor stability in the process of the follow-up use of electrokinetic cell that long little electric current constant current charge can form simultaneously, the battery consistency of producing in enormous quantities is not high, cause Vehicular dynamic battery power density, energy density recycle in process, decay too fast, in recycling, unsettled SEI film can react repeatedly with battery plus-negative plate material simultaneously, cause the decomposition of organic principle in electric liquid, produce gas simultaneously, cause inner pressure of battery to raise, battery bulging, also can battery continuation use be embedded in potential safety hazard.
Summary of the invention
The present invention is intended at least solve one of technical problem existing 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: described electrokinetic cell is carried out to electrolyte for the first time and inject; In the first Preset Time, described electrokinetic cell is carried out to activating charge for the first time with the first predetermined current; Described electrokinetic cell is left standstill to the second Preset Time, and wherein, described the second Preset Time is greater than described the first Preset Time; Described electrokinetic cell is carried out to activating charge for the second time, described activating charge is for the second time pulse constant current constant voltage charge, wherein, the charging current of described activating charge is for the second time less than described the first predetermined current, and the charging interval of described activating charge is for the second time greater than described the first Preset Time; And described electrokinetic cell is carried out for the second time to electrolyte be injected into full.
Further, the amount that described electrolyte for the first time injects is the 50-80% of total electrolyte injection rate.
Further, described the first predetermined current is 0.4-0.8C.
Further, described the first Preset Time is 10-60S.
Further, described the second Preset Time is 1-5h.
Further, describedly described electrokinetic cell is carried out to activating charge for the second time further comprise: with the second predetermined current, described electrokinetic cell is carried out to activating charge with by described power battery charging to the first predeterminated voltage, and described electrokinetic cell meets under described the first predeterminated voltage first pre-conditioned; Described electrokinetic cell is left standstill to the 3rd Preset Time; With the 3rd predetermined current, described electrokinetic cell is carried out to activating charge with by described power battery charging to the second predeterminated voltage, and described electrokinetic cell meets second pre-conditioned under described the second predeterminated voltage, wherein, described the second predeterminated voltage is greater than described the first predeterminated voltage, and described the 3rd predetermined current is greater than described the second predetermined current; Described electrokinetic cell is left standstill to the 4th Preset Time; With the 4th predetermined current, described electrokinetic cell is carried out to activating charge with by described power battery charging to the three predeterminated voltages, and described electrokinetic cell meets the 3rd pre-conditioned under described the 3rd predeterminated voltage, wherein, described the 3rd predeterminated voltage is greater than described the second predeterminated voltage, and described the 4th predetermined current is greater than described the 3rd predetermined current; And described electrokinetic cell is left standstill to the 5th Preset Time.
Further, described the 3rd Preset Time, the 4th Preset Time are identical with the 5th Preset Time.
Further, described the first predetermined current is 0.01-0.1C, and described the second predetermined current is 0.1-0.3C, and described the 3rd predetermined current is 0.3-0.6C.
Further, described the first predeterminated voltage is 1.3-1.6V, and described the second predeterminated voltage is 2.8-3.2V, and described the 3rd predeterminated voltage is 3.2-3.6V.
Further, described first pre-conditioned be under described the first predeterminated voltage, the charging interval that the electric current of described electrokinetic cell reaches the first pre-set limit electric current or described electrokinetic cell reached for the first pre-set limit time; Described second pre-conditioned be under described the second predeterminated voltage, the charging interval that the electric current of described electrokinetic cell reaches the second pre-set limit electric current or described electrokinetic cell reached for the second pre-set limit time; And described the 3rd pre-conditioned be under described the 3rd predeterminated voltage, the charging interval that the electric current of described electrokinetic cell reaches the 3rd pre-set limit electric current or described electrokinetic cell reached for the 3rd pre-set limit time;
Further, described the first pre-set limit electric current is 0.001-0.01C, and described the second pre-set limit electric current is 0.01-0.1C, and described the 3rd pre-set limit electric current is 0.01-0.1C.
Further, described the first pre-set limit time, described the second pre-set limit time are identical with described the 3rd pre-set limit time.
The invention has the advantages that and can form and stablize fine and close SEI film on battery plus-negative plate plate material surface, effectively improve the rate of decay of power density in cyclic process of ferric phosphate electrokinetic cell, energy density, circulation volume, security performance, promoted the consistency of electrokinetic cell; Reduce the loss in manufacture process of electric liquid simultaneously, improve the operating environment of fluid injection operation, in reducing manufacturing cost, strengthened 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.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, 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
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " 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 instructions 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 device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of 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 terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, also can comprise that the first and second features are not directly contacts but by the other feature contact between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic under Second Characteristic and tiltedly, or only represent that First Characteristic level height is less than Second Characteristic.
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. electrokinetic cell is carried out to electrolyte for the first time and inject.
In one embodiment of the invention, the amount that electrolyte injects is for the first time the 50-80% of total electrolyte injection rate.
Step B. carries out for the 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 activating charge for the second time to electrokinetic cell, and activating charge is pulse constant current constant voltage charge for the second time, and wherein, the charging current of activating charge is less than the first predetermined current for the second time, and the charging interval of activating charge is greater than the first Preset Time for the second time.
In one embodiment of the invention, step D further comprises: 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, the 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. carries out activating charge with by power battery charging to the three predeterminated voltages with the 4th predetermined current to electrokinetic cell, and electrokinetic cell meets the 3rd pre-conditioned under the 3rd predeterminated voltage, wherein, the 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 charging interval that the electric current of electrokinetic cell reaches the first pre-set limit electric current or electrokinetic cell reached for the first pre-set limit time; Second pre-conditioned be under the second predeterminated voltage, the charging interval that the electric current of electrokinetic cell reaches the second pre-set limit electric current or electrokinetic cell reached for the second pre-set limit time; And the 3rd pre-conditioned be under the 3rd predeterminated voltage, the charging interval that the electric current of electrokinetic cell reaches the 3rd pre-set limit electric current or electrokinetic cell reached for the 3rd pre-set limit time;
In one embodiment of the invention, the first pre-set limit electric current is 0.001-0.01C, and the second pre-set limit electric current is 0.01-0.1C, and the 3rd pre-set limit electric current is 0.01-0.1C.
In one embodiment of the invention, the first pre-set limit time, the second pre-set limit time are identical with the 3rd pre-set limit time.
Step e. electrokinetic cell is carried out to electrolyte for the second time and be injected into full.
For making those skilled in the art understand better the present invention, 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, carry out according to the following steps power battery liquid-injection activation.
S1: the lithium iron phosphate dynamic battery having assembled carries out opening fluid injection first, reservoir quantity is total fluid-injecting amount 65%.
S2: will carry out immediately large current charge first 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, and battery carries out secondary activating charging subsequently, and secondary activating is charged as pulse constant voltage charge, point 3 stages carry out:
The 1st stage, with the charging current of 0.03C, battery is charged, so that cell voltage reaches 1.5V, maintain subsequently 1.5V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.003C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 30min is above, stop constant voltage charge.Leave standstill subsequently 5min.
In the 2nd stage: the charging current with 0.10C is charged to battery, so that cell voltage reaches 3.0V, maintain subsequently 3.0V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.01C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 1h is above, stop constant voltage charge.Leave standstill subsequently 5min.
In the 3rd stage: the charging current with 0.4C is charged to battery, so that cell voltage reaches 3.3V, maintain subsequently 3.3V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.05C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 1h is above, stop constant voltage charge.
S5: battery vacuumizes Exhaust Gas to having charged.
S6: the battery of Exhaust Gas is carried out to fluid injection again, and reservoir quantity is total fluid-injecting amount 35%.
S7: battery is sealed.
Embodiment 2:
In the present embodiment, carry out according to the following steps power battery liquid-injection activation.
S1: the lithium iron phosphate dynamic battery having assembled carries out opening fluid injection first, reservoir quantity is total fluid-injecting amount 75%.
S2: will carry out immediately large current charge first 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 to battery and carry out secondary activating charging.Secondary activating is charged as pulse constant voltage charge, and point 3 stages carry out:
The 1st stage, with the charging current of 0.04C, battery is charged, so that cell voltage reaches 1.5V, maintain subsequently 1.5V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.004C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 30min is above, stop constant voltage charge.Leave standstill subsequently 5min.
In the 2nd stage: the charging current with 0.13C is charged to battery, so that cell voltage reaches 3.0V, maintain subsequently 3.0V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.01C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 1h is above, stop constant voltage charge.Leave standstill subsequently 5min.
In the 3rd stage: the charging current with 0.45C is charged to battery, so that cell voltage reaches 3.3V, maintain subsequently 3.3V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.05C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 1h is above, stop constant voltage charge.
S5: battery vacuumizes Exhaust Gas to having charged.
S6: the battery of Exhaust Gas is carried out to fluid injection again, and reservoir quantity is total fluid-injecting amount 25%.
S7: battery is sealed.
Embodiment 3:
In the present embodiment, carry out according to the following steps power battery liquid-injection activation.
S1: the lithium iron phosphate dynamic battery having assembled carries out opening fluid injection first, reservoir quantity is total fluid-injecting amount 80%.
S2: will carry out immediately large current charge first 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 to battery and carry out secondary activating charging.Secondary activating is charged as pulse constant voltage charge, and point 3 stages carry out:
The 1st stage, with the charging current of 0.05C, battery is charged, so that cell voltage reaches 1.5V, maintain subsequently 1.5V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.005C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 30min is above, stop constant voltage charge.Leave standstill subsequently 5min.
In the 2nd stage: the charging current with 0.15C is charged to battery, so that cell voltage reaches 3.0V, maintain subsequently 3.0V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.01C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 1h is above, stop constant voltage charge.Leave standstill subsequently 5min.
In the 3rd stage: the charging current with 0.5C is charged to battery, so that cell voltage reaches 3.3V, maintain subsequently 3.3V constant voltage and continue charging a period of time.Usually, when constant voltage charge, along with battery is full of gradually, charged electrical fails to be convened for lack of a quorum and gradually declines.Be down to and stop constant voltage charge after 0.05C when electric current.Or, from the timing of constant voltage charge beginning, after constant voltage charge 1h is above, stop constant voltage charge.
S5: battery vacuumizes Exhaust Gas to having charged.
S6: the battery of Exhaust Gas is carried out to fluid injection again, and reservoir quantity is total fluid-injecting amount 20%.
S7: battery is sealed.
Comparative example:
As a comparison, carry out according to the following steps battery battery core fluid injection activation.
S1: carry out fluid injection to having assembled battery, reservoir quantity is total fluid-injecting amount 100%.
S2: after fluid injection is completed, battery leaves standstill 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: battery is carried out to vacuumizing and exhausting.
S5: battery is sealed.
The effect activating in order to evaluate the battery core fluid injection of each battery, after battery core is analyzed, has carried out cycle detection to the battery of the various embodiments described above and comparative example, analyzes 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, be then discharged to 2.0V with 1.0C electric current, shelve 20 minutes, record initial discharge capacity D1.Repeat step above battery is carried out to charge and discharge cycles test, and record each discharge capacity, in the time that discharge capacity is less than battery initial capacity 80%, end cycle detection.Capacity attenuation rate=1-D100/D1 circulates 100 times; Capacity attenuation rate=the 1-D300/D1 that circulates 300 times, capacity attenuation rate=1-D500/D1 circulates 500 times; Discharge capacity of the cell when D100 represents the 100th loop test, discharge capacity of the cell when D300 represents the 300th loop test, discharge capacity of the cell when D800 represents 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 that adopts the inventive method to carry out fluid injection activation is significantly less than the battery that conventional method is manufactured; That is to say that the method according to this invention carries out battery core fluid injection and activate the battery of the obvious excellence of electrical property, security performance, cycle life and the traditional fluid injection active mode manufacture of the battery of processing; This explanation adopts the inventive method control electric core aging process can obviously eliminate the bad side reaction of inside battery, is conducive to, uniformly SEI film stable, fine and close at cell negative plate Surface Creation, thereby has improved 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, can effectively promote automobile power cell performance and reduce battery manufacture cost;
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described 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 in the situation that not departing from principle of the present invention and aim, amendment, replacement and modification.
Claims (12)
1. a fluid injection Activiation method for electrokinetic cell, is characterized in that, comprising:
Described electrokinetic cell is carried out to electrolyte for the first time to be injected;
In the first Preset Time, described electrokinetic cell is carried out to activating charge for the first time with the first predetermined current;
Described electrokinetic cell is left standstill to the second Preset Time, and wherein, described the second Preset Time is greater than described the first Preset Time;
Described electrokinetic cell is carried out to activating charge for the second time, described activating charge is for the second time pulse constant current constant voltage charge, wherein, the charging current of described activating charge is for the second time less than described the first predetermined current, and the charging interval of described activating charge is for the second time greater than described the first Preset Time; And
Described electrokinetic cell is carried out to electrolyte to be for the second time injected into full.
2. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, is characterized in that, the amount that described electrolyte for the first time injects is the 50-80% of total electrolyte injection rate.
3. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, is characterized in that, described the first predetermined current is 0.4-0.8C.
4. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, is characterized in that, described the first Preset Time is 10-60S.
5. the fluid injection Activiation method of electrokinetic cell as claimed in claim 1, is characterized in that, described the 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 described electrokinetic cell is carried out to activating charge for the second time further comprises:
With the second predetermined current, described electrokinetic cell is carried out to activating charge with by described power battery charging to the first predeterminated voltage, and described electrokinetic cell meets under described the first predeterminated voltage first pre-conditioned;
Described electrokinetic cell is left standstill to the 3rd Preset Time;
With the 3rd predetermined current, described electrokinetic cell is carried out to activating charge with by described power battery charging to the second predeterminated voltage, and described electrokinetic cell meets second pre-conditioned under described the second predeterminated voltage, wherein, described the second predeterminated voltage is greater than described the first predeterminated voltage, and described the 3rd predetermined current is greater than described the second predetermined current;
Described electrokinetic cell is left standstill to the 4th Preset Time;
With the 4th predetermined current, described electrokinetic cell is carried out to activating charge with by described power battery charging to the three predeterminated voltages, and described electrokinetic cell meets the 3rd pre-conditioned under described the 3rd predeterminated voltage, wherein, described the 3rd predeterminated voltage is greater than described the second predeterminated voltage, and described the 4th predetermined current is greater than described the 3rd predetermined current; And
Described electrokinetic cell is left standstill to the 5th Preset Time.
7. the fluid injection Activiation method of electrokinetic cell as claimed in claim 6, is characterized in that, described the 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, is characterized in that, described the first predetermined current is 0.01-0.1C, and described the second predetermined current is 0.1-0.3C, and described the 3rd predetermined current is 0.3-0.6C.
9. the fluid injection Activiation method of electrokinetic cell as claimed in claim 6, is characterized in that, described the first predeterminated voltage is 1.3-1.6V, and described the second predeterminated voltage is 2.8-3.2V, and described the 3rd predeterminated voltage is 3.2-3.6V.
10. the fluid injection Activiation method of electrokinetic cell as claimed in claim 6, is characterized in that,
Described first pre-conditioned be under described the first predeterminated voltage, the charging interval that the electric current of described electrokinetic cell reaches the first pre-set limit electric current or described electrokinetic cell reached for the first pre-set limit time;
Described second pre-conditioned be under described the second predeterminated voltage, the charging interval that the electric current of described electrokinetic cell reaches the second pre-set limit electric current or described electrokinetic cell reached for the second pre-set limit time; And
Described the 3rd pre-conditioned be under described the 3rd predeterminated voltage, the charging interval that the electric current of described electrokinetic cell reaches the 3rd pre-set limit electric current or described electrokinetic cell reached for the 3rd pre-set limit time.
The fluid injection Activiation method of 11. electrokinetic cells as claimed in claim 10, is characterized in that, described the first pre-set limit electric current is 0.001-0.01C, and described the second pre-set limit electric current is 0.01-0.1C, and described the 3rd pre-set limit electric current is 0.01-0.1C.
The fluid injection Activiation method of 12. electrokinetic cells as claimed in claim 10, is characterized in that, described the first pre-set limit time, described the second pre-set limit time are identical with described the 3rd pre-set limit time.
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