CN109273663A - A kind of battery electrolyte injection method - Google Patents
A kind of battery electrolyte injection method Download PDFInfo
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- CN109273663A CN109273663A CN201811391571.7A CN201811391571A CN109273663A CN 109273663 A CN109273663 A CN 109273663A CN 201811391571 A CN201811391571 A CN 201811391571A CN 109273663 A CN109273663 A CN 109273663A
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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
Abstract
The present invention provides a kind of battery electrolyte injection method.The described method includes: (1) injects the electrolyte into battery to be processed, battery after being injected carries out negative pressure to the battery after the injection and stands pretreatment, and progress positive pressure stands pretreatment after being vented to normal pressure, after being vented to normal pressure, pretreated battery is obtained；(2) pretreated battery is stood under negative pressure, is stood under positive pressure after being vented to normal pressure later, complete a pressure differential circulation after being vented to normal pressure；(3) pressure differential for repeating step (2) recycles at least 1 time, obtains the battery of circular treatment；(4) negative pressure is carried out to the battery of circular treatment and stands post-processing, obtain the battery of completion fluid injection after being vented to normal pressure.The method of the invention realizes the shortenings of time of repose needed for waiting electrolyte complete wetting after the completion of the reduction of the dry area's area of electrode after fluid injection, the promotion of electrolyte wet-out rate and liquid injection process.
Description
Technical field
The invention belongs to technical field of energy storage, are related to a kind of cell production method more particularly to a kind of battery electrolyte injection method.
Background technique
With science and technology and rapid economic development, the function of market electronic product is stronger and stronger, and the requirement of shape molded dimension
It is smaller and smaller, weight demands are more and more lighter.Lithium ion battery is small in size, energy is high, high working voltage, non-environmental-pollution, circulation
The advantages that service life is long, operating temperature range is wide.
Lithium ion battery generally comprises battery case and is contained in the intracorporal battery core of battery case and nonaqueous electrolytic solution, the battery core
Including anode, cathode and the diaphragm between anode and cathode.The preparation method of the battery, with the positive electrode, the negative electrode and the separator system
At battery core, then battery core is placed in battery case, nonaqueous electrolytic solution injects in battery case.The nonaqueous electrolytic solution generally contains
There are organic solvent and lithium salts.Therefore electrolyte uptake number be related to battery capacity and cycle life, the suction of electrolyte
Receiving deficiency will cause decline, the increase of the internal resistance of cell and the rapid decaying of cycle life that battery holds reason.Lithium ion battery is continuous
Reduce volume, high-energy direction develop, in battery for accommodate electrolyte space it is very limited.It therefore must be limited
Space absorbs the electrolyte more than possibility as much as possible, provides battery needed electrolyte, improves the cycle life of battery.
Fluid injection (i.e. injection electrolyte) is the critical process for manufacturing battery.Reservoir quantity directly affect battery security performance and
Capacity.The method mostly extension fluid injection time that the country solves fluid injection difficulty can only extend production in order not to reduce production efficiency
Line increases multistation equipment.Which increase the costs of equipment, have aggravated plant maintenance, can also reduce the stability of liquid injection system,
Improve equipment failure rate.In current electrolyte filling method, technique is stood for 24 hours using room temperature after sealing in pole piece wellability,
But it has no equipment or battery cannot be dismantled to destruction and check dry area's size, therefore the technique is technique mark general in industry
Standard can not affirm the wet face state of pole piece；The infiltration of pole piece be after fluid injection room temperature stand when slowly infiltrate pole piece with every
Film simultaneously reaches balance complete wetting, but initially dry area is in different size for battery pole piece, and time of repose should also be inconsistent, so
It is extremely important to optimize battery pole piece wellability in liquid injection process.When electrolyte effect of impregnation is bad, ion transmission path becomes remote,
Shuttle of the lithium ion between positive and negative anodes is hindered, cell electrochemical reaction can not be participated in not in contact with the pole piece of electrolyte, simultaneously
Cell interface resistance increases.
CN104466083A discloses the electrolyte filling method in a kind of Production Process of Lithium Battery, includes the following steps, 1), to lithium
Battery pumping high vacuum, and 12~16s is kept, high vacuum is -0.09~-0.12Mpa；2), fluid injection is carried out to lithium battery；3), right
Lithium battery is at the uniform velocity filled with 1~3s of nitrogen, and pressure reaches 0.5~0.7Mpa, keeps 145~155s；4), lithium battery is at the uniform velocity taken out low
1~3s of vacuum, and 32~38s is kept, low vacuum is -0.06~-0.08Mpa；5) step 3) and step 4), are repeated several times；
6), high pressure keeps 55~65s, and the high pressure is 0.5~0.7Mpa, and injection process is completed.
CN105702909A discloses a kind of electrolyte filling method of cylindrical battery, and the method at least includes the following steps:
Battery roll core is placed in electrolyte by step S01. to be impregnated；The battery roll core impregnated by electrolyte is packed by step S02.
Battery case；Step S03. injects the electrolyte, and vacuumize process, pressurized treatments into the battery case；Wherein, the leaching
Bubble, placement and dress shell processing are both needed to carry out in environment of the dew point lower than -35 DEG C；The volume of the electrolyte of injection accounts for described
The 0.07%~20% of battery case cavity volume.
CN108054338A discloses a kind of liquid injection process of lithium-ion-power cell, has specifically included following steps: first
The battery core of lithium-ion-power cell is first entered shell to be placed on liquid injection industrial installation, it is taken out very with -0.08~-0.09MPa vacuum degree
Sky, breaking vacuum flows into electrolyte in battery case naturally after standing, then with 0.09-0.15MPa after equipressure inside and outside shell
Electrolyte is pressed into shell by high-pressure inert gas, and high pressure is slowly abolished to the primary note of completion after finally high pressure conditions being kept to stand
Liquid circulation.
However above-mentioned liquid injection process can not efficiently reduce the dry area that battery pole piece after liquid injection process does not infiltrate, and
And process flow is all long, wet-out rate also needs to be advanced optimized.
Therefore, developing a kind of more optimal battery electrolyte injection method of parameter has important meaning to this field.
Summary of the invention
For the above-mentioned problems in the prior art, the purpose of the present invention is to provide a kind of battery electrolyte injection methods.This
The battery electrolyte injection method that invention provides can greatly reduce the dry sector width in battery pole piece, increase wetting velocity, improve battery
Production efficiency solves the problems, such as liquid injection process in the prior art because time-consuming and becomes the bottleneck in battery manufacture.
To achieve this purpose, the present invention adopts the following technical scheme:
The present invention provides a kind of battery electrolyte injection method, the described method comprises the following steps:
(1) it injects the electrolyte into battery to be processed, battery after being injected, negative pressure is carried out to the battery after the injection
Pretreatment is stood, progress positive pressure stands pretreatment after being vented to normal pressure, after being vented to normal pressure, obtains pretreated battery；
(2) step (1) the pretreated battery is stood under negative pressure, is vented to after normal pressure later under positive pressure
It is stood, completes a pressure differential circulation after being vented to normal pressure；
(3) pressure differential for repeating step (2) recycles at least 1 time, obtains the battery of circular treatment；
(4) negative pressure is carried out to the battery of step (3) described circular treatment and stands post-processing, completed after being vented to normal pressure
The battery of fluid injection.
In electrolyte filling method provided by the invention, positive pressure value influences most battery pole piece Zhong Gan area's size in injection process
To be significant, influence of the negative pressure value to dry area is taken second place, by designing reasonable vacuum → normal pressure → positive pressure → normal pressure pressure differential
Circulation improves solid-liquid contact probability, and infiltrating time can be shortened, subtract in the case where electrolyte content is constant by expanding contact area
Time needed for working hour needed for few liquid injection process and electrolyte complete wetting increases the rate of electrolyte infiltration pole piece,
And dry area's area can be effectively reduced.
In electrolyte filling method provided by the invention, electrolyte is along in the steel shell and cell gap and core of battery to be processed
Heart hole flow to rapidly bottom, i.e. electrolyte infiltrates pole piece path and infiltrated from upper and lower both sides to centre, therefore reasonable by setting
Liquid filling pressure is poor, and fluid injection wet-out rate is increased, and intermediate dry sector width/area is smaller.
The negative pressure of step (1) stands pretreatment and positive pressure stands pretreatment and the negative pressure of step (4) stands post-processing pair
In the wetting velocity for accelerating electrolyte, reducing the area electrode Zhong Gan area also has important role.
Step (2) pressure differential circulation refers to be stood under the negative pressure in the step, is vented to later often
It is stood under positive pressure after pressure, is vented to a whole set of operation of normal pressure.
In step (3), the pressure differential for repeating step (2) is recycled at least 1 time, such as 1 time, 2 times, 3 times, 4 times, 5 times, 6
It is secondary, 7 times or 8 inferior.
In the present invention, the positive pressure and negative pressure refer to ambient pressure value locating for battery, not the pressure value of inside battery.
In the present invention, the normal pressure refers to 1 atmospheric pressure.
It is used as currently preferred technical solution below, but not as the limitation to technical solution provided by the invention, leads to
Following preferred technical solution is crossed, can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, step (1) battery to be processed is 18650 batteries.
Preferably, the shape of the battery to be processed is cylinder.
As currently preferred technical solution, in step (1), the injection rate of electrolyte is battery case inner cavity to be processed
The 24.505%~25.570% of volume, for example, 24.505%, 24.608%, 24.752%, 24.861%, 25.012%,
25.239%, 25.397% or 25.570% etc., it is not limited to cited numerical value, other are unlisted in the numberical range
Numerical value it is equally applicable.The reservoir quantity range can improve infiltration under conditions of army's battery electrical property has an adverse effect
Speed.
As currently preferred technical solution, it includes: first first that step (1) negative pressure, which stands pretreated method,
The first negative pressure time of repose is maintained under negative pressure, after being vented to normal pressure, then the second negative pressure time of repose is maintained under the second negative pressure.
Pretreatment is stood in negative pressure and carries out Negative pressure twice, can be prevented after once vacuumizing, though battery local environment
So reach the negative pressure value of setting, but the negative pressure value of inside battery does not reach the negative pressure value of setting and influences the note of electrolyte
Enter effect.
Preferably, first negative pressure be -100~-90kPa, such as -100kPa, -98kPa, -96kPa, -95kPa, -
93kPa, -91kPa or -90kPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable, preferably -95kPa.
Preferably, the first negative pressure time of repose is 60~80s, such as 60s, 65s, 70s, 75s or 80s etc., but simultaneously
It is not limited only to cited numerical value, other unlisted numerical value are equally applicable in the numberical range, preferably 70s.
Preferably, second negative pressure be -100~-90kPa, such as -100kPa, -98kPa, -96kPa, -95kPa, -
93kPa, -91kPa or -90kPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable, preferably -95kPa.
Preferably, the second negative pressure time of repose is 50~70s, such as 50s, 55s, 60s, 65s or 70s, etc., but simultaneously
It is not limited only to cited numerical value, other unlisted numerical value are equally applicable in the numberical range, preferably 60s.
Preferably, the time of normal pressure is vented between first negative pressure and the second negative pressure as 4~10s, such as 4s,
4.5s, 5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited numerical value, interior other of the numberical range are not arranged
The numerical value of act is equally applicable.
Preferably, described to be vented to often before positive pressure stands pretreatment after negative pressure stands pretreatment in step (1)
The time of pressure is 4~10s, such as 4s, 4.5s, 5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited
Numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
As currently preferred technical solution, it includes: first first that step (1) positive pressure, which stands pretreated method,
Direct draught maintains the first positive pressure time of repose, after being vented to normal pressure, then in the second direct draught the second positive pressure time of repose of maintenance.
Preferably, first positive pressure be 0.3~0.4MPa, such as 0.3MPa, 0.32MPa, 0.35MPa, 0.38MPa or
0.4MPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, preferably
0.35MPa。
Preferably, the first positive pressure time of repose is 180~190s, such as 180s, 183s, 185s, 187s or 190s
Deng, it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, preferably 185s.
Preferably, second positive pressure be 0.3~0.4MPa, such as 0.3MPa, 0.32MPa, 0.35MPa, 0.38MPa or
0.4MPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, preferably
0.35MPa。
Preferably, the second positive pressure time of repose be 90~110s, such as 90s, 92s, 95s, 98s, 100s, 102s,
104s, 106s, 108s or 110s etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable, preferably 100s.
Preferably, the time of normal pressure is vented between first positive pressure and the second positive pressure as 8~12s, such as 8s, 9s,
10s, 11s or 12s etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With preferably 10s.
Preferably, in step (1), after positive pressure stands pretreatment, the time for being vented to normal pressure is 4~10s, such as
4s, 4.5s, 5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited numerical value, in the numberical range other
Unlisted numerical value is equally applicable.
In preferred embodiment of the invention, when step (1) negative pressure stands pretreatment and positive pressure standing pretreated maintenance
Between it is all long, and be divided into and apply pressure twice, be preferably to progressively reach setting value for cell internal pressure, simultaneously
Enter electrolyte in diaphragm gap to be infiltrated.
As currently preferred technical solution, step (2) negative pressure be -100~-90kPa, such as -100kPa, -
98kPa, -96kPa, -95kPa, -93kPa, -91kPa or -90kPa etc., it is not limited to cited numerical value, the numerical value model
Other unlisted numerical value are equally applicable in enclosing, preferably -95kPa.
Preferably, step (2) time stood under negative pressure is 25~35s, such as 25s, 27s, 30s, 32s
Or 35s etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, preferably
30s。
Preferably, in step (2), after negative pressure is stood, before positive pressure is stood, the time for being vented to normal pressure is 4~10s,
Such as 4s, 4.5s, 5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited numerical value, in the numberical range
Other unlisted numerical value are equally applicable.
Preferably, step (2) positive pressure be 0.3~0.4MPa, such as 0.3MPa, 0.32MPa, 0.35MPa,
0.38MPa or 0.4MPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With preferably 0.35MPa.Here, if positive pressure value is excessively high, it will lead to equipment positive pressure tracheae gas leakage；If positive pressure is worth too low, meeting
Cause electrolyte not inject in battery all, leads to electrolyte solution loss.
Preferably, step (2) time stood under positive pressure is 50~70s, such as 50s, 52s, 55s, 58s
Or 60s etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, preferably
60s。
Preferably, in step (2), positive pressure stand after, the time for being vented to normal pressure be 4~10s, such as 4s, 4.5s,
5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited numerical value, other are unlisted in the numberical range
Numerical value is equally applicable.
In the present invention, the item that is recycled using above-mentioned preferred positive pressure value and negative pressure value and time of repose as pressure differential
Part can better ensure that the effect of impregnation of electrolyte in battery, it is made more fully to infiltrate the gap of pole piece.
As currently preferred technical solution, step (3) the duplicate number be 4 times~8 times, such as 4 times, 5 times,
6 times, 7 times or 8 times, preferably 6 times.It can either guarantee the effect of impregnation of electrolyte using above-mentioned preferred cycle criterion,
Working hour needed for battery liquid-filling will not be spun out again.
As currently preferred technical conditions, the method that step (4) negative pressure stands post-processing includes: first in third
Third negative pressure time of repose is maintained under negative pressure, after being vented to normal pressure, then the 4th negative pressure time of repose is maintained under the 4th negative pressure.
Preferably, the third negative pressure be -100~-90kPa, such as -100kPa, -98kPa, -96kPa, -95kPa, -
93kPa, -91kPa or -90kPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable, preferably -95kPa.
Preferably, the third negative pressure time of repose is 20~30s, such as 20s, 23s, 25s, 27s or 30s etc., but simultaneously
It is not limited only to cited numerical value, other unlisted numerical value are equally applicable in the numberical range, preferably 25s.
Preferably, the 4th negative pressure be -100~-90kPa, such as -100kPa, -98kPa, -96kPa, -95kPa, -
93kPa, -91kPa or -90kPa etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable, preferably -95kPa.
Preferably, the 4th negative pressure time of repose is 20~30s, such as 20s, 23s, 25s, 27s or 30s etc., but simultaneously
It is not limited only to cited numerical value, other unlisted numerical value are equally applicable in the numberical range, preferably 25s.
In the present invention, post-processing approach is stood using above-mentioned preferred negative pressure, carries out negative pressure stewing process twice, and use
Above-mentioned preferred negative pressure value and time of repose can be extracted out with the inside battery air after fluid injection, increase the leaching of electrolyte and pole piece
Moisten rate, is finally completed injection process.
Preferably, the time of normal pressure is vented between the third negative pressure and the 4th negative pressure as 4~10s, such as 4s,
4.5s, 5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited numerical value, interior other of the numberical range are not arranged
The numerical value of act is equally applicable.
Preferably, in step (4), after negative pressure stands post-processing, the time for being vented to normal pressure is 4~10s, such as
4s, 4.5s, 5s, 5.5s, 6s, 7s, 8s, 9s or 10s etc., it is not limited to cited numerical value, in the numberical range other
Unlisted numerical value is equally applicable.
As currently preferred technical solution, the positive pressure is obtained by being passed through protective gas.
Preferably, the protective gas includes nitrogen.
Preferably, the negative pressure is by vacuumizing acquisition.
Preferably, it in step (1), is injected the electrolyte into battery to be processed with fluid injection cup.
As the further preferred technical solution of electrolyte filling method of the present invention, the described method comprises the following steps:
(1) it injects the electrolyte into battery to be processed, battery after being injected, to the battery after the injection first -100
60~80s is maintained under~-90kPa, 4~10s of final vacuum to normal pressure, then 50~70s is maintained at -100~-90kPa, exhaust
After 4~10s to normal pressure, 180~190s is first maintained at 0.3~0.4MPa, after being vented to normal pressure, then in 0.3~0.4MPa
90~110s of lower maintenance obtains pretreated battery after being vented 4~10s to normal pressure；
Wherein, the injection rate of electrolyte is the 24.505%~25.570% of battery case cavity volume to be processed；
(2) step (1) the pretreated battery is stood at -100~-90kPa, time of repose be 25~
35s, final vacuum 4~10s to normal pressure after stood at 0.3~0.4MPa, time of repose be 50~70s, exhaust 4~
A pressure differential circulation is completed after 10s to normal pressure；
(3) pressure differential for repeating step (2) recycles 4 times~8 times, obtains the battery of circular treatment；
(4) at -100~-90kPa maintenance 20~30s first to the battery of step (3) described circular treatment, exhaust 4~
After 10s to normal pressure, then 20~30s is maintained at -100~-90kPa, obtain the electricity of completion fluid injection after being vented 4~10s to normal pressure
Pond.
Compared with prior art, the invention has the following advantages:
Battery electrolyte injection method process provided by the invention is short, easy to operate, is easy to apply in industrialization mass production, and
Using negative pressure value (vacuum degree) and positive pressure value and positive pressure, the optimization of negative pressure held time and to vacuum → normal pressure → positive pressure
The optimization of the pressure differential circulation of → normal pressure, realizes that electrode after fluid injection does the reduction of area's area, electrolyte wet-out rate mentions
The shortening of time of repose needed for waiting electrolyte complete wetting after the completion of liter and liquid injection process.Battery liquid-filling provided by the invention
Method realizes the dry sector width of electrode of 18650 cylindrical batteries after the completion of fluid injection in 1.4cm hereinafter, dry area's area exists
66cm2Hereinafter, the technique only needs to carry out 4h standing electrolyte i.e. complete wetting pole piece again after the fluid injection of complete battery pair.
Detailed description of the invention
Fig. 1 a is the photo of the pole piece obtained after disassembling the battery for completing fluid injection in the embodiment of the present invention 1, black line in figure
Between part be dry area；
Fig. 1 b is the photo of the pole piece obtained after the battery of completion fluid injection in comparative example 1 is disassembled, the portion in figure between black line
It is divided into dry area；
Fig. 2 is the case line that pole piece does area's area in the battery for the completion fluid injection that the embodiment of the present invention 1 and comparative example 1 obtain
Figure；
Fig. 3 is the pole piece of battery after injecting electrolyte in the embodiment of the present invention 1 as the progress of liquid injection process is when different
The distribution trend figure of the area Jian Gan area.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, below further specifically to the present invention
It is bright.But following embodiments is only simple example of the invention, does not represent or limit the scope of the present invention, this
Invention protection scope is subject to claims.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1
This implementation provides a kind of battery electrolyte injection method, the described method comprises the following steps:
(1) it is injected the electrolyte into cylindrical 18650 battery to be processed with fluid injection cup, battery after being injected, to described
Battery after injection first maintains 70s at -95kPa, final vacuum 5s to normal pressure, then 60s is maintained at -95kPa, exhaust 5s is extremely
After normal pressure, 185s is first maintained at 0.35MPa, after being vented 10s to normal pressure, then maintains 100s at 0.35MPa, and exhaust 5s is extremely
After normal pressure, pretreated battery is obtained；
Wherein, the injection rate of electrolyte is the 25.04% of battery case cavity volume to be processed；
(2) step (1) the pretreated battery is stood at -95kPa, time of repose 30s, final vacuum
It is stood at 0.35MPa after 5s to normal pressure, time of repose 60s, completes a pressure differential after exhaust 5s to normal pressure and follow
Ring；
(3) pressure differential for repeating step (2) recycles 6 times, obtains the battery of circular treatment；
(4) 25s is first maintained at -95kPa to the battery of step (3) described circular treatment, after being vented 5s to normal pressure, then
25s is maintained at -95kPa, obtains the battery of completion fluid injection after being vented 5s to normal pressure.
In the present embodiment, positive pressure is obtained by inflated with nitrogen, by vacuumizing acquisition negative pressure.
In the battery for the completion fluid injection that this implementation obtains, the dry sector width of electrode is 1.2cm, and dry area's area is
52.71cm2, the technique is after injecting the electrolyte into battery to be processed, it is only necessary to and liquid injection process can be completed in the 1100s time,
4h is only needed to stand i.e. complete wetting pole piece.
Table 1 is the parameter list that each step carries out pressure control in the present embodiment, and one column of step number therein will be adjusted each time
Section pressure is considered as a work step.
Table 1
Fig. 1 a is the photo of the pole piece obtained after disassembling the battery for completing fluid injection in the embodiment of the present invention 1, black line in figure
Between part be dry area, can be seen that dry sector width is relatively narrow by the figure, non-wetted area is smaller.
Fig. 3 is the pole piece of battery after injecting electrolyte in the embodiment of the present invention 1 as the progress of liquid injection process is when different
The distribution trend figure of the area Jian Gan area can be seen that electrolyte enters the pass of battery Hou Gan area's area and time of repose by the figure
System, it can be seen that after room temperature stands 4h, non-wetted area area is 0, i.e. complete wetting.
Embodiment 2
This implementation provides a kind of battery electrolyte injection method, the described method comprises the following steps:
(1) it is injected the electrolyte into cylindrical 18650 battery to be processed with fluid injection cup, battery after being injected, to described
Battery after injection first maintains 60s at -100kPa, final vacuum 10s maintain 50s to normal pressure, then at -100kPa, be vented
After 10s to normal pressure, first 180s is maintained at 0.4MPa, after being vented 12s to normal pressure, then at 0.4MPa maintain 90s, be vented
After 10s to normal pressure, pretreated battery is obtained；
Wherein, the injection rate of electrolyte is the 25.570% of battery case cavity volume to be processed；
(2) step (1) the pretreated battery is stood at -100kPa, time of repose 25s, heel row
It is stood at 0.4MPa after gas 10s to normal pressure, time of repose 50s, completes a pressure differential after being vented 10s to normal pressure
Circulation；
(3) pressure differential for repeating step (2) recycles 8 times, obtains the battery of circular treatment；
(4) 20s is first maintained at -100kPa to the battery of step (3) described circular treatment, after being vented 10s to normal pressure, then
20s is maintained at -100kPa, obtains the battery of completion fluid injection after being vented 10s to normal pressure.
In the battery for the completion fluid injection that this implementation obtains, the dry sector width of electrode is 0.8cm, and dry area's area is
34.75cm2, the technique is after injecting the electrolyte into battery to be processed, it is only necessary to and liquid injection process can be completed in the 1242s time,
4h is only needed to stand i.e. complete wetting pole piece.
Embodiment 3
(1) it is injected the electrolyte into cylindrical 18650 battery to be processed with fluid injection cup, battery after being injected, to described
Battery after injection first maintains 80s at -90kPa, final vacuum 5s to normal pressure, then 70s is maintained at -90kPa, exhaust 4s is extremely
After normal pressure, first 190s being maintained at 0.3MPa, after being vented 8s to normal pressure, then maintaining 110s at 0.3MPa, exhaust 4s is to normal
After pressure, pretreated battery is obtained；
Wherein, the injection rate of electrolyte is the 24.505% of battery case cavity volume to be processed；
(2) step (1) the pretreated battery is stood at -90kPa, time of repose 35s, final vacuum
It is stood at 0.3MPa after 4s to normal pressure, time of repose 70s, completes a pressure differential after exhaust 4s to normal pressure and follow
Ring；
(3) pressure differential for repeating step (2) recycles 4 times, obtains the battery of circular treatment；
(4) 30s is first maintained at -90kPa to the battery of step (3) described circular treatment, after being vented 4s to normal pressure, then
30s is maintained at -90kPa, obtains the battery of completion fluid injection after being vented 4s to normal pressure.
In the battery for the completion fluid injection that this implementation obtains, the dry sector width of electrode is 1.4cm, and dry area's area is
65.62cm2, the technique is after injecting the electrolyte into battery to be processed, it is only necessary to which liquid injection process can be completed in the 951s time, only
4h is needed to stand i.e. complete wetting pole piece.
Embodiment 4
This implementation provides a kind of battery electrolyte injection method, the described method comprises the following steps:
(1) it is injected the electrolyte into cylindrical 18650 battery to be processed with fluid injection cup, battery after being injected, to described
Battery after injection first maintains 70s at -90kPa, final vacuum 5s to normal pressure, then maintain 60s at -100kPa, be vented 5s
To normal pressure, 185s is first maintained at 0.3MPa, after being vented 10s to normal pressure, then maintains 100s at 0.4MPa, and exhaust 5s is extremely
After normal pressure, pretreated battery is obtained；
Wherein, the injection rate of electrolyte is battery case cavity volume 25.04% to be processed；
(2) step (1) the pretreated battery is stood at -98kPa, time of repose 30s, final vacuum
It is stood at 0.38MPa after 5s to normal pressure, time of repose 60s, completes a pressure differential after exhaust 5s to normal pressure and follow
Ring；
(3) pressure differential for repeating step (2) recycles 6 times, obtains the battery of circular treatment；
(4) 25s is first maintained at -95kPa to the battery of step (3) described circular treatment, after being vented 5s to normal pressure, then
25s is maintained at -100kPa, obtains the battery of completion fluid injection after being vented 5s to normal pressure.
In the present embodiment, positive pressure is obtained by inflated with nitrogen, by vacuumizing acquisition negative pressure.
In the battery for the completion fluid injection that this implementation obtains, the dry sector width of electrode is 1.4cm, and dry area's area is
62.36cm2, the technique is after injecting the electrolyte into battery to be processed, it is only necessary to and liquid injection process can be completed in the 1100s time,
4h is only needed to stand i.e. complete wetting pole piece.
Comparative example 1
The battery electrolyte injection method of this comparative example the following steps are included:
(1) it is injected the electrolyte into cylindrical 18650 battery to be processed with fluid injection cup, battery after being injected, to described
Battery after injection first maintains 70s at -70kPa, final vacuum 5s to normal pressure, then 60s is maintained at -75kPa, exhaust 5s is extremely
After normal pressure, 185s is first maintained at 0.15MPa, after being vented 10s to normal pressure, then maintains 100s at 0.15MPa, and exhaust 5s is extremely
After normal pressure, pretreated battery is obtained；
Wherein, the injection rate of electrolyte is battery case cavity volume 25.04% to be processed；
(2) step (1) the pretreated battery is stood at -80kPa, time of repose 50s, final vacuum
It is stood at 0.15MPa after 5s to normal pressure, time of repose 185s, completes a pressure differential after being vented 10s to normal pressure
Circulation；
(3) pressure differential for repeating step (2) recycles 2 times, obtains the battery of circular treatment；
(4) 50s is first maintained at -85kPa to the battery of step (3) described circular treatment, after being vented 5s to normal pressure, then
50s is maintained at -85kPa, obtains the battery of completion fluid injection after being vented 5s to normal pressure.
In this comparative example, positive pressure is obtained by inflated with nitrogen, by vacuumizing acquisition negative pressure.
In the battery for the completion fluid injection that this comparison obtains, the dry sector width of electrode is 2.0cm, and dry area's area is
136.53cm2, which needs the 1050s time can achievable fluid injection work after injecting the electrolyte into battery to be processed
Skill, needing to stand for 24 hours could complete wetting pole piece.
Fig. 1 b is the photo of the pole piece obtained after the battery of completion fluid injection in this comparative example is disassembled, the portion in figure between black line
It is divided into dry area, can be seen that dry sector width is wider by the figure, non-wetted area is far longer than embodiment 1.
Fig. 2 is the box traction substation that pole piece does area's area in the battery for the completion fluid injection that embodiment 1 and comparative example 1 obtain, by this
For figure it can be seen that this patent liquid injection process is significantly better than prior art, dry area's area greatly reduces 61.4%, larger to improve
Electrolyte and pole piece, diaphragm wellability after battery liquid-filling.
Comparative example 2
Referring to embodiment 1, difference is for the battery electrolyte injection method of this comparative example, in step (1), with fluid injection cup by electrolyte
After injecting in cylindrical 18650 battery to be processed, the negative pressure without the step subsequent stands pretreatment and positive pressure is stood in advance
Processing, but directly carry out the operation of step (2).
In the battery for the completion fluid injection that this comparison obtains, the dry sector width of electrode is 3.0cm, and dry area's area is
203.0cm2, which needs the 1050s time can achievable fluid injection work after injecting the electrolyte into battery to be processed
Skill, needing 20h to stand could complete wetting pole piece.
Comparative example 3
Referring to embodiment 1, difference is the battery electrolyte injection method of this comparative example, without the operation of step (4), i.e., does not exist
Negative pressure is carried out to the battery of circular treatment after step (3) circular treatment and stands post-processing.
In the battery for the completion fluid injection that this comparison obtains, the dry sector width of electrode is 1.8cm, and dry area's area is
129.2cm2, which needs the 1050s time can achievable fluid injection work after injecting the electrolyte into battery to be processed
Skill, needing 20h to stand could complete wetting pole piece.
Comparative example 4
Referring to embodiment 1, difference is the battery electrolyte injection method of this comparative example, in step (2), by the pressure of positive pressure standing
It is turned up from 0.35MPa to 0.55MPa, and also carries out pressure differential circulation by the positive pressure of 0.55MPa in step (3).
In the battery for the completion fluid injection that this comparison obtains, the dry sector width of electrode is 1.6cm, and dry area's area is
122.6cm2, which needs the 1050s time can achievable fluid injection work after injecting the electrolyte into battery to be processed
Skill, needing to stand for 24 hours could complete wetting pole piece.
Comparative example 5
Referring to embodiment 1, difference is the battery electrolyte injection method of this comparative example, in step (2), by the pressure of positive pressure standing
It turns down from 0.35MPa to 0.1MPa, and also carries out pressure differential circulation by the positive pressure of 0.1MPa in step (3).
In the battery for the completion fluid injection that this comparison obtains, the dry sector width of electrode is 2.9cm, and dry area's area is
211.6cm2, which needs the 1050s time can achievable fluid injection work after injecting the electrolyte into battery to be processed
Skill, needing 28h to stand could complete wetting pole piece.
It is easy to operate based on the above embodiments with comparative example it is found that battery electrolyte injection method process provided by the invention is short, easily
Applied in industrialization mass production, realize electrode after fluid injection do the reduction of area's area, the promotion of electrolyte wet-out rate with
And the shortening in liquid injection process working hour.The positive pressure value and negative pressure value of comparative example 1 are undesirable, and comparative example 2 is before pressure differential cycles processing
It does not carry out negative pressure and stands pretreatment and positive pressure standing pretreatment, comparative example 3 is quiet without carrying out negative pressure after pressure differential cycles processing
Postpone processing, the pressure differential cycles processing step positive pressure value of comparative example 4 and comparative example 5 is improper, and the result of above-mentioned comparative example is
Dry area's area is excessive, and the time for being required to extremely grow after the fluid injection process of complete battery pair, which is stood, just can make electrolyte complete
Infiltration, can not obtain excellent results of the invention.
The Applicant declares that the present invention is explained by the above embodiments detailed process equipment and process flow of the invention,
But the present invention is not limited to the above detailed process equipment and process flow, that is, it is above-mentioned detailed not mean that the present invention must rely on
Process equipment and process flow could be implemented.It should be clear to those skilled in the art, any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within of the invention
Within protection scope and the open scope.
Claims (10)
1. a kind of battery electrolyte injection method, which is characterized in that the described method comprises the following steps:
(1) it injects the electrolyte into battery to be processed, battery after being injected, negative pressure standing is carried out to the battery after the injection
Pretreatment, progress positive pressure stands pretreatment after being vented to normal pressure, after being vented to normal pressure, obtains pretreated battery；
(2) step (1) the pretreated battery is stood under negative pressure, is vented to after normal pressure and carries out under positive pressure later
It stands, completes a pressure differential circulation after being vented to normal pressure；
(3) pressure differential for repeating step (2) recycles at least 1 time, obtains the battery of circular treatment；
(4) negative pressure is carried out to the battery of step (3) described circular treatment and stands post-processing, obtain completing fluid injection after being vented to normal pressure
Battery.
2. battery electrolyte injection method according to claim 1, which is characterized in that step (1) battery to be processed is 18650
Battery；
Preferably, the shape of the battery to be processed is cylinder.
3. battery electrolyte injection method according to claim 1 or 2, which is characterized in that in step (1), the injection rate of electrolyte
It is the 24.505%~25.570% of battery case cavity volume to be processed.
4. battery electrolyte injection method according to claim 1-3, which is characterized in that step (1) negative pressure is stood
Pretreated method includes: that the first negative pressure time of repose is first maintained under the first negative pressure, after being vented to normal pressure, then in the second negative pressure
The second negative pressure time of repose of lower maintenance；
Preferably, first negative pressure is -100~-90kPa, preferably -95kPa；
Preferably, the first negative pressure time of repose is 60~80s, preferably 70s；
Preferably, second negative pressure is -100~-90kPa, preferably -95kPa；
Preferably, the second negative pressure time of repose is 50~70s, preferably 60s；
Preferably, the time that normal pressure is vented between first negative pressure and the second negative pressure is 4~10s；
Preferably, in step (1), after negative pressure stands pretreatment, before positive pressure stands pretreatment, the normal pressure that is vented to
Time is 4~10s.
5. battery electrolyte injection method according to claim 1-4, which is characterized in that step (1) positive pressure is stood
Pretreated method includes: first to maintain the first positive pressure time of repose in the first direct draught, after being vented to normal pressure, then in the second positive pressure
The second positive pressure time of repose of lower maintenance；
Preferably, first positive pressure is 0.3~0.4MPa, preferably 0.35MPa；
Preferably, the first positive pressure time of repose is 180~190s, preferably 185s；
Preferably, second positive pressure is 0.3~0.4MPa, preferably 0.35MPa；
Preferably, the second positive pressure time of repose is 90~110s, preferably 100s；
Preferably, the time that normal pressure is vented between first positive pressure and the second positive pressure is 8~12s, preferably 10s；
Preferably, in step (1), after positive pressure stands pretreatment, the time for being vented to normal pressure is 4~10s.
6. battery electrolyte injection method according to claim 1-5, which is characterized in that step (2) negative pressure be-
100~-90kPa, preferably -95kPa；
Preferably, step (2) time stood under negative pressure is 25~35s, preferably 30s；
Preferably, in step (2), after negative pressure is stood, before positive pressure is stood, the time for being vented to normal pressure is 4~10s；
Preferably, step (2) positive pressure is 0.3~0.4MPa, preferably 0.35MPa；
Preferably, step (2) time stood under positive pressure is 50~70s, preferably 60s；
Preferably, in step (2), after positive pressure is stood, the time for being vented to normal pressure is 4~10s.
7. battery electrolyte injection method according to claim 1-6, which is characterized in that step (3) described duplicate time
Number is 4 times~8 times, preferably 6 times.
8. battery electrolyte injection method according to claim 1-7, which is characterized in that step (4) negative pressure is stood
The method of post-processing includes: that third negative pressure time of repose is first maintained under third negative pressure, after being vented to normal pressure, then in the 4th negative pressure
The 4th negative pressure time of repose of lower maintenance；
Preferably, the third negative pressure is -100~-90kPa, preferably -95kPa；
Preferably, the third negative pressure time of repose is 20~30s, preferably 25s；
Preferably, the 4th negative pressure is -100~-90kPa, preferably -95kPa；
Preferably, the 4th negative pressure time of repose is 20~30s, preferably 25s；
Preferably, the time that normal pressure is vented between the third negative pressure and the 4th negative pressure is 4~10s；
Preferably, in step (4), after negative pressure stands post-processing, the time for being vented to normal pressure is 4~10s.
9. battery electrolyte injection method according to claim 1-8, which is characterized in that the positive pressure is passed through protection
Property gas obtain；
Preferably, the protective gas includes nitrogen；
Preferably, the negative pressure is by vacuumizing acquisition；
Preferably, it in step (1), is injected the electrolyte into battery to be processed with fluid injection cup.
10. -9 described in any item battery electrolyte injection methods according to claim 1, which is characterized in that the method includes following steps
It is rapid:
(1) inject the electrolyte into battery to be processed, battery after being injected, to the battery after the injection first -100~-
60~80s is maintained under 90kPa, 4~10s of final vacuum to normal pressure, then 50~70s is maintained at -100~-90kPa, exhaust 4~
After 10s to normal pressure, 180~190s is first maintained at 0.3~0.4MPa, after being vented to normal pressure, then is tieed up at 0.3~0.4MPa
90~110s is held, after being vented 4~10s to normal pressure, obtains pretreated battery；
Wherein, the injection rate of electrolyte is the 24.505%~25.570% of battery case cavity volume to be processed；
(2) step (1) the pretreated battery being stood at -100~-90kPa, time of repose is 25~35s, it
It is stood at 0.3~0.4MPa after final vacuum 4~10s to normal pressure, time of repose is 50~70s, and 4~10s is to normal for exhaust
A pressure differential circulation is completed after pressure；
(3) pressure differential for repeating step (2) recycles 4 times~8 times, obtains the battery of circular treatment；
(4) 20~30s is first maintained at -100~-90kPa to the battery of step (3) described circular treatment, 4~10s of exhaust is extremely
After normal pressure, then 20~30s is maintained at -100~-90kPa, obtain the battery of completion fluid injection after being vented 4~10s to normal pressure.
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| CN111653722A (en) * | 2020-05-15 | 2020-09-11 | 捷威动力工业嘉兴有限公司 | Efficient liquid injection method and device for soft package battery |
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