CN110416445A - Diplopore lithium ion cover board and its rocking chair type priming device and method - Google Patents
Diplopore lithium ion cover board and its rocking chair type priming device and method Download PDFInfo
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- CN110416445A CN110416445A CN201910666200.3A CN201910666200A CN110416445A CN 110416445 A CN110416445 A CN 110416445A CN 201910666200 A CN201910666200 A CN 201910666200A CN 110416445 A CN110416445 A CN 110416445A
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- fluid injection
- lithium ion
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- cup
- liquid
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000037452 priming Effects 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 206
- 238000002347 injection Methods 0.000 claims abstract description 206
- 239000012530 fluid Substances 0.000 claims abstract description 165
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 9
- 239000003792 electrolyte Substances 0.000 claims description 52
- 238000007789 sealing Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229920002943 EPDM rubber Polymers 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005213 imbibition Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000005041 Mylar™ Substances 0.000 description 2
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
The invention discloses a kind of diplopore lithium ion cover board and its rocking chair type priming device and methods, belong to lithium-ion electric pool process preparation technical field.Wherein, which includes the first liquid injection hole for being separately positioned on cover board both ends, the second liquid injection hole, and each liquid injection hole is respectively positioned on the top of lithium ion battery A pole piece Yu the angle B pole piece r；The welding site for being fixedly connected with positive and negative tab is additionally provided on cover board.In fluid injection, diplopore lithium ion cover board is placed in above lithium ion battery ontology and is welded and fixed together, the fluid injection cup fluid injection of left and right ends is passed through, battery feed liquor under vacuum conditions, into battery core after multidirectional can disperse, quickly infiltrate, single branch battery liquid-filling time is short, meets quick fluid injection requirement；And the internal gas that produces can also be made to shunt discharge by double liquid injection holes in forming and capacity dividing, increase leaving area, reduce battery swell, eliminate the abnormal phenomenon of discharge.
Description
Technical field
The present invention relates to electrolyte is injected into battery, belongs to lithium-ion electric pool process preparation technical field, specifically relate to
And a kind of diplopore lithium ion cover board and its rocking chair type priming device and method.
Background technique
Lithium ion battery is since the 1990s commercially produces, and higher specific energy is pollution-free, memoryless effect
The advantages that answering and having extended cycle life has obtained extensively in fields such as telecommunications, energy storage device, electric car and aerospaces
Application, with the fast development of electric car industry in recent years, to the product of lithium ion battery, especially power lithium-ion battery
Matter requirement is also higher and higher, present invention seek to address that battery is insufficient in fluid injection and forming and capacity dividing；
1, fluid injection background: electrolyte is the indispensable important component of lithium ion battery, as lithium ion mobility and
The medium of charge transfer is known as " blood " of lithium battery, and the gap that electrolysis solution permeates in battery is very small, causes to be electrolysed
Liquid infiltration is highly difficult, currently in order to meeting national policy requirement, the energy density of battery is constantly promoted, iron lithium, ternary system electricity
Pond body is long-pending and capacity becomes greatly, therefore inside battery voidage is smaller, the fluid injection that fluid injection difficulty is bigger, time-consuming is longer, current
Mode be broadly divided into it is following several, regardless of using which kind of mode all need for a long time stand can just make the fully penetrated infiltration of electrolyte
Battery Pole Core, therefore need further to study improvement；
1.1, high pressure equipressure fluid injection: battery integral sealing when fluid injection, interior additional identical positive pressure or negative pressure, to prevent battery
Swell is injected into electrolyte in battery core under the effect of the pressure, keeps after a certain period of time, then generated bubble air is taken out
It walks, enters for electrolyte next time and space is provided, stood by multiple positive/negative-pressure circulation repeatedly and complete injection process, this side
The deficiency of formula is that liquid-injection equipment is huge, the fluid injection time is long, reservoir quantity is unstable, battery external and internal pressure unbalance stress shell swell
Etc. abnormal phenomenon.
1.2, it restrains formula fluid injection: being protected and designed using four sides by fixture, the big face of battery and side are restrained in fixture
Interior, battery bulging when preventing pressurized circulation, injection process is almost the same with high pressure equipressure, is recycled by repeated multiple times positive/negative-pressure quiet
It sets and completes fluid injection, difference, which is that inside and outside unidirectional pressurization, pressure difference, so pressure when pressurization is necessarily less than cover board explosion-proof valve institute
The range that can be born, otherwise there are explosion or gas leak phenomenons for explosion-proof valve, therefore contained formula fluid injection can only repeatedly be followed by small pressure
Ring completes fluid injection, and higher pressure equipressure efficiency is lower, and occupation area of equipment is bigger, risk is higher.
1.3, inverse inhalation type fluid injection: it is to be upside down in battery in the locating module of fluid injection plate, makes battery fluid by vacuum cavitations
It is automatically injected in battery by suction pipe, completes fluid injection by principle of negative pressure, but to be only suitable for small-capacity cells straight in liquid injection hole for this mode
Diameter uses when being less than 1.25mm, can flow backwards under Gravitative Loads more than diameter range electrolyte, and high capacity cell is such as according to this
Aperture fluid injection, efficiency certainly will substantially reduce.
2, it is melted into background: forming one layer of SEI film in negative terminal surface when chemical conversion, and can occur in forming process in SEI film
Oxidation reaction and generate bulk gas, when voltage rises to 3.0-3.5V, produce that air volume is maximum, and the presence of gas inevitably results in
The bulging of battery, excessive, the battery appearance of electrolyte are corroded, capacity is relatively low etc., and bad phenomenons, current formation regime close
Mouth chemical conversion, normal pressure chemical conversion, negative pressure chemical conversion.
2.1: low current charge is used using silent method for chemically synthesizing, vacuumize process again after Battery formation,
The relationship being shown experimentally that between silent chemical conversion thickness and SOC%, as 5%SOC, thickness change amplitude is maximum, when 25%
Thickness changes to maximum when SOC, so silent formation efficiency is low, and will lead to battery swell.
2.2: swell improves efficiency in order to prevent, changes normal pressure opening and restrains chemical conversion, but the gas meeting in electrolyte generated
Exist in the form of bubble, overflowed outward with electrolyte, causes the corrosion of battery appearance and the deterioration of workshop condition, while opening
It is carried out in water-less environment at needs, generally requires the biggish fund of investment and build drying shed control, so open formation will lead to
Electrolyte overflows, and influences the consistency of battery performance.
2.3: many patents show that the mode being melted by using negative pressure takes gas away at present to solve the above-mentioned problems,
But the too small gas of vacuum degree can not be equally completely exhausted out, and there are bulging risks for battery, taken electrolyte away if crossing conference, influenced
Battery performance consistency, it is therefore desirable to be improved.
Chinese invention patent application (application publication number: CN109037579A, data of publication of application: 2018-12-18) discloses
A kind of square power battery constant pressure priming device and electrolyte filling method, using high pressure isqpressure type fluid injection, specifically, described logical
Crossing gas-tpe fitting positive/negative-pressure alternating 8-12 times is rapidly injected electrolyte in battery compartment；Each positive pressure is 0.6Mpa, when pressure maintaining
Between 30s, negative pressure -100kpa, dwell time 30s, it is described and concrete model is not specified.It is with a 54173200 lithium iron battery
Example, capacity is being 3.7mm for 215AH, reservoir quantity 1000g ± 20g, fluid injection bore dia, according to high pressure equipressure fluid injection, electrolyte from
It is dispersed into battery core from top to bottom, needs 34min, efficiency requirements 12ppm according to single branch battery liquid-filling time is verified, design is each
Simultaneously 8 batteries of note, every 40s one group out can be needed, is had the following deficiencies:
(1) fluid injection low efficiency: due to being compaction state between the pole piece and diaphragm of battery core, voidage is small, and electrolyte can not
Rapid dispersion, therefore vacuumized again after needing pressure maintaining to settle electrolyte gradually after the pressurizing, pressure maintaining is also needed after vacuumizing
Repressurization afterwards causes the fluid injection time long；
(2) fluid injection yield is low: pole piece occupies the 95% of inside battery space after entering shell, external when inside and outside while when pressurizeing
Space because resistance it is small can rapid pressure, and internal pressure all acts on the intracorporal electrolyte of cup, with the entrance of electrolyte,
Inner air compression, it is inside and outside to will form certain pressure difference, such as control it is improper be more than shell or cover board tolerance range when, then will lead to electricity
Pond swell or explosion-proof valve explosion gas leakage；
(3) fluid injection precision is low: after electrolyte needed for single branch battery is accurately squeezed into fluid injection cup by topping-up pump, then passing through fluid injection
Cup is squeezed into battery, and fluid injection can only be completed within the set time by process control during this, and can not measure fluid injection
The fluid level condition of cup electrolyte inside, and there is some difference for the rate of liquid aspiration between battery, so there is electricity within the set time
Solution liquid can not all infuse phenomenon, and battery is caused to lack liquid, fluid infusion again after needing to weigh.
(4) equipment cost is high: learning 51 positive/negative-pressure fluid injections of needs (34*12/8) by calculating according to the above efficiency requirements
Position can meet, while according to different models, the fluid injection position of the higher needs of efficiency requirements is more, therefore occupation area of equipment
Also bigger, so leading to equipment manufacturing costs height.
(5) be melted into bad height: size of the negative pressure chemical conversion when vacuumizing because of liquid injection hole determines the rate of exhaust, in order to protect
Card electrolyte is not extracted, and can reduce vacuum degree, and the too small internal gas that will lead to of vacuum degree can not be discharged in time, lead to battery
Shell expands.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of diplopore lithium ion cover board and its rocking chair type priming device with
Method, the priming device and electrolyte filling method compatibility are wide, can flexible combination work step complete fluid injection, and be suitable for various appearances
Measure big baby battery.
To achieve the above object, the invention discloses a kind of diplopore lithium ion cover boards, it includes being separately positioned on cover board two
First liquid injection hole, second liquid injection hole at end, each liquid injection hole are respectively positioned on the upper of lithium ion battery A pole piece and the angle B pole piece r
Side；Welding site for being fixedly connected with positive and negative tab is additionally provided on the cover board further, the cover board material is aluminium
Plate, model are AL3003, and the force of explosion of the cover board explosion-proof valve is 600~900kpa.
Further, the positive and negative tab welding of the cover board and lithium ion battery ontology upper end, each of on the cover board
Liquid injection hole is all connected with one end of a fluid injection cup, the other end of each fluid injection cup and liquid injection pipe, central movable guide rod and leads
Tracheae is in parallel, and the every gas-guide tube connects two branches, and a branch road is equipped with pressurizing valve, and another branch road is equipped with decompression
Valve.
Further, the liquid injecting mouth and V-shape that each fluid injection cup bottom is equipped with for being connected with liquid injection hole sealing are close
Seal block.And V-shaped sealing block controls the pass between liquid injecting mouth and battery liquid-filling hole by the central movable guide rod at the top of fluid injection cup
It closes and is connected.
Preferably, sealing ring is equipped between the liquid injecting mouth and liquid injection hole, the sealing ring material is EPDM.
Preferably, the liquid injecting mouth material is SUS316.
Preferably, the material of the V-shape sealing block is EPDM, has permanent corrosion resistance.
Preferably, the material of the lithium ion battery ontology is aluminum hull, and pressure resistance is greater than 1Mpa.
In order to preferably realize the technology of the present invention purpose, the invention also discloses carried out using above-mentioned rocking chair type priming device
Fluid injection, it includes according to the liquid absorption amount of different model battery, using at least one of following three kinds of fluid injection modes；
Only pressurization does not vacuumize: inputting positive pressure, another fluid injection cup by the pressurizing valve of one of fluid injection cup when fluid injection
Gas-guide tube communicated with ambient atmosphere；
Or only vacuumize and be not pressurized: the gas-guide tube of one of fluid injection cup is communicated with ambient atmosphere when fluid injection, another
Fluid injection cup makes lithium ion battery body interior be in negative pressure state by pressure reducing valve；
Or vacuumized in pressurization: positive pressure being inputted by the pressurizing valve of one of fluid injection cup when fluid injection, and by another
The pressure reducing valve of one fluid injection cup makes lithium ion battery body interior be in negative pressure state.And this kind of mode efficiency highest.
Further, it includes following detailed process:
1) vacuumize detect entire priming device air-tightness it is whether qualified, if after pressure maintaining vacuum degree change, pass through fluid injection
Pipe injects electrolyte into fluid injection cup；Central movable guide rod lifts reset, the V-shape sealing in fluid injection cup bottom liquid injecting mouth
Block generates displacement, and internal negative pressure separately flows into electrolyte at the top of A pole piece, at the top of B pole piece and along the angle A pole piece R, B battery core R angular flux
Enter battery bottom；Electrolyte flows into 55~65%；
2) positive pressure is inputted by the pressurizing valve of one of fluid injection cup, and by the pressure reducing valve of another fluid injection cup make lithium from
It is in negative pressure state inside sub- battery body, flows into remaining electrolyte in lithium ion battery ontology, then reversed alternate cycles behaviour
Make the pressurizing valve and pressure reducing valve of fluid injection cup, until fluid injection is completed.
Further, after the completion of fluid injection, liquid injecting mouth has raffinate, inputs positive pressure by the pressurizing valve of one of fluid injection cup,
The gas-guide tube of another fluid injection cup is communicated with ambient atmosphere, and raffinate is blown into lithium ion battery ontology.
Further, the pressure reducing valve vacuumizing and exhausting of each fluid injection cup is opened in forming and capacity dividing after the completion of fluid injection.
Further, the pressure reducing valve of each gas-guide tube is also connected with acoustooptic alarm system.
The beneficial effects are mainly reflected as follows following aspects:
1, the diplopore fluid injection mode that designs of the present invention can make battery feed liquor under vacuum conditions, into battery core after can be multidirectional point
It dissipates, quickly infiltrates, single branch battery liquid-filling can control in 9~10min and complete, and quick fluid injection requirement can be completed；And it is being melted into
The internal gas that produces can also be made to shunt discharge when partial volume by double liquid injection holes, increase leaving area, reduce battery swell, eliminate discharge
Abnormal phenomenon；
2, acoustooptic alarm system has also been devised to indicate that single branch battery liquid-filling is complete in the diplopore priming device that the present invention designs
At；Be conducive to promote fluid injection precision, solve the problems such as low efficiency, bad height, low precision of high pressure equipressure fluid injection mode；
3, diversified forms can be used to complete fluid injection in the diplopore fluid injection mode that the present invention designs, and can accomplishing only to pressurize, it is true not take out
Sky only vacuumizes to be not pressurized or vacuumize in pressurization and completes fluid injection, can also be used according to the liquid absorption amount of different model battery
Hybrid mode completes fluid injection, is suitable for the fluid injection of the big baby battery of various models；
4, the diplopore fluid injection cover board force of explosion that the present invention designs is 600~900kpa, and shell pressure resistance is greater than 1Mpa, after improvement
Inside battery can be made to be in negative pressure state feed liquor, negative pressure value is up to -100kpa, therefore is far below cover board in inside battery negative pressure
The pressure bearing range of shell, while pole piece occupies the 95% of inside battery space, so battery will not produce under negative pressure state
Raw deformation, solves high pressure equipressure fluid injection mode because of the battery swell risk caused by inside and outside differential pressure；
5, priming device after the improvement that the present invention designs, improved efficiency stand position and can reduce to 15, not only save land occupation
Area, while also reducing equipment making cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of cover board；
Fig. 2 is liquid injection hole enlarged structure schematic diagram in Fig. 1；
Fig. 3 is the structural schematic diagram of priming device；
Fig. 4 is priming device and lithium ion battery connecting portion partial enlargement structural representation in Fig. 2；
Fig. 5 is the process flow using electrolyte filling method of the present invention；
Fig. 6 is to improve the single branch battery liquid-filling time comparison diagram in front and back；
Fig. 7 is fluid injection cyclic process schematic diagram；
Wherein, each part numbers are as follows in Fig. 1 to Fig. 4:
(wherein, the first fluid injection cup 2.1 is (wherein, for cover board 1 (wherein, liquid injection hole 1.1, welding site 1.2), priming device 2
Liquid injecting mouth 2.11, V-shape sealing block 2.12), the second fluid injection cup 2.2, the first liquid injection pipe 2.3, in the second liquid injection pipe 2.4, first
Heart moveable combination of guide rod 2.5, the second central movable guide rod 2.6, (wherein, the first positive valve 2.71, first depressurizes the first gas-guide tube 2.7
Valve 2.72), the second gas-guide tube 2.8 (wherein, the second positive valve 2.81, the second pressure reducing valve 2.82)), lithium ion battery 3 (wherein,
Lithium ion battery ontology 3.1, A pole piece 3.2 (wherein, A pole piece top surface 3.21, the angle A pole piece R 3.22), 3.3 (wherein, the pole B of B pole piece
Core top surface 3.31, the angle A pole piece R 3.32), Mylar film 3.4, positive and negative tab and cover board pad 3.5), electrolyte 4.
Specific embodiment
As shown in Figure 1, the diplopore lithium ion cover board is mainly used for electricity the invention discloses a kind of diplopore lithium ion cover board
Electrolyte is injected in pond inner cavity；Specifically, the first liquid injection hole 1.1, the second liquid injection hole 1.2 is respectively set at 1 both ends of cover board, for note
The pore size of perforation, the present invention are not especially limited requirement, generally according to battery capacity and fluid injection cup volumes flexible design；Often
A liquid injection hole is respectively positioned on lithium ion battery A pole piece 3.2 and is connected with B pole piece 3.3 surface at position, specifically, in conjunction with
Fig. 1 and Fig. 2 it is found that each liquid injection hole is respectively positioned on the surface at the angle A pole piece R 3.22 and the angle B pole piece R 3.32, meanwhile, in institute
State the welding site 1.2 being additionally provided on cover board 1 for being fixedly connected with positive and negative tab；Positive and negative tab passes through the welding site 1.2
Positive and negative tab and cover board pad 3.5 are formed with the welding of cover board 1, and is additionally provided between A pole piece 3.2 and B pole piece 3.3
Mylar film 3.4；For the material of cover board 1, the present invention is preferably aluminium sheet, and model is AL3003, the force of explosion of the cover board explosion-proof valve
For 600~900kpa.
As shown in Figure 3, Figure 4, the invention discloses a kind of rocking chair type priming devices 2, wherein cover board 1 and lithium ion battery
3.1 upper end of ontology is fixedly linked, and one of liquid injection hole 1.1 on the cover board 1 connects one end of the first fluid injection cup 2.1, institute
State the other end of the first fluid injection cup 2.1 respectively with the first liquid injection pipe 2.3, the first central movable guide rod 2.5 and the first gas-guide tube 2.7
Parallel connection, also, first gas-guide tube 2.7 connects two branches, and a branch road is equipped with the first pressurizing valve 2.71, another branch
Road is equipped with the first pressure reducing valve 2.72；Similarly, another liquid injection hole 1.1 on the cover board 1 connects the one of the second fluid injection cup 2.2
End, the other end of the second fluid injection cup 2.2 respectively with the second liquid injection pipe 2.4, the second central movable guide rod 2.6 and the second air guide
Pipe 2.8 is in parallel, also, second gas-guide tube 2.8 connects two branches, and a branch road is equipped with the second pressurizing valve 2.81, separately
One branch road is equipped with the second pressure reducing valve 2.82.Preferably, liquid injecting mouth 2.11 and V word are additionally provided in each fluid injection cup bottom
Type sealing block 2.12.It is further preferred that the material of the V-shape sealing block 2.12 is the strong EPDM of corrosion resistance, have
The material of permanent corrosion resistance, liquid injecting mouth 2.11 is SUS316, and is additionally provided with sealing ring between the liquid injecting mouth and liquid injection hole,
The sealing ring material is also EPDM.The material of the lithium ion battery ontology is aluminum hull, and pressure resistance is greater than 1Mpa.In addition, also
It is preferred that the first pressure reducing valve 2.72 and the second pressure reducing valve 2.82 connect acoustooptic alarm system.The acoustooptic alarm system can prompt fluid injection
Completion status.
When the above-mentioned rocking chair type priming device that the present invention designs carries out fluid injection, it includes the imbibition according to different model battery
Amount, using at least one of following three kinds of fluid injection modes；
Only pressurization does not vacuumize: inputting positive pressure, another fluid injection cup by the pressurizing valve of one of fluid injection cup when fluid injection
Gas-guide tube communicated with ambient atmosphere；
Or only vacuumize and be not pressurized: the gas-guide tube of one of fluid injection cup is communicated with ambient atmosphere when fluid injection, another
Fluid injection cup makes lithium ion battery body interior be in negative pressure state by pressure reducing valve；
Or vacuumized in pressurization: positive pressure being inputted by the pressurizing valve of one of fluid injection cup when fluid injection, and by another
The pressure reducing valve of one fluid injection cup makes lithium ion battery body interior be in negative pressure state.
In order to better explain the present invention, above-mentioned priming device is explained below in conjunction with specific electrolyte filling method and Fig. 5
It states.
1, it seals: taking lithium ion battery to be placed in fixture, wherein every group of fixture can put 8 batteries, fluid injection cup lower end
Liquid injecting mouth 2.11 be connected with the liquid injection hole 1.1 on cover board 1, at this point, due to the effect of V-shape sealing block 2.12, fluid injection cup with
Sealing state is between lithium ion battery ontology 3.1；
2, it leaks hunting: pushing the first central movable guide rod 2.5 of the first fluid injection cup 2.1, be further advanced by V-shape sealing block
2.12 sealing liquid injecting mouths 2.11, open the second pressure reducing valve 2.82 on the second gas-guide tube 2.8 of the second fluid injection cup 2.2, make second
Vacuum degree is -50~-100kpa, pressure maintaining 20s in fluid injection cup 2.2, and vacuum degree is dropped by less than 0.5kpa, illustrates the note of left and right ends
Liquid cup air-tightness is qualified, for non-conforming equipment not fluid injection；Vacuum shape is also maintained inside lithium ion battery ontology 3.1 simultaneously
State.
3, it beats liquid: Dan Zhi electricity is accurately squeezed into the first fluid injection cup 2.1 through the first liquid injection pipe 2.3 by external topping-up pump
1000g electrolyte content needed for pond；
4, imbibition: lifting the first central movable guide rod 2.5 in the first fluid injection cup 2.1, and position occurs for V-shape sealing block 2.12
It moves, connected state is between the first fluid injection cup 2.1 and lithium ion battery ontology 3.1, inside lithium ion battery ontology 3.1
There is 5% space to be in light condition, by electrolyte 4 self weight and battery vacuum state can quick imbibition 60%, specifically
It is that electrolyte 4 divides for three parts, separately flows into 3.21 at the top of A pole piece, 3.31 and along the angle A pole piece R 3.22, B battery core at the top of B pole piece
The angle R 3.32 flows into battery bottom；
As liquid enters vacuum degree reduction, there are certain resistance inside lithium ion battery ontology 3.1, electrolyte no longer under
Drop；
5, right circulation fluid injection for the first time: after vacuum liquid-absorbing, electrolyte 4 is most of to be rested in lithium ion battery ontology 3.1
Portion upper left half part, then control the first fluid injection cup 2.1 by the first pressurizing valve 2.71 pressurization on the first gas-guide tube 2.7, simultaneously
Second fluid injection cup 2.2 passes through the second pressure reducing valve 2.82 decompression on the second gas-guide tube 2.8, as electrolyte 4 declines, lithium-ion electric
Air inside pond ontology 3.1 can be taken away rapidly by the second gas-guide tube 2.8 of the second fluid injection cup 2.2, provide feed liquor space, institute
Stating pressure range is 100~500kpa, and uses drying nitrogen, is depressurized as negative pressure, specifically -50~-100kpa, and left and right is simultaneously
Continue pressure maintaining 120s, 40% electrolyte 4 of residue is continued to inject inside lithium ion battery ontology 3.1, then control the first note respectively
Liquid cup 2.1,2.2 positive/negative-pressure pipeline pressure release of the second fluid injection cup to normal pressure；
6, left circulation fluid injection for the first time: in above-mentioned steps 5, the second fluid injection cup 2.2 in negative pressure state because resistance is small, meeting
There is 10%~15% electrolyte 4 to be extracted into the second fluid injection cup 2.2, it is therefore desirable to which the second fluid injection of Reverse Turning Control cup 2.2 passes through the
The pressurization of two pressurizing valves 2.81, while the first fluid injection cup 2.1 is vacuumized by the first pressure reducing valve 2.72 on the first liquid injection pipe 2.3,
With the entrance of electrolyte, the air inside lithium ion battery ontology 3.1 can be taken away rapidly by the first fluid injection cup, provide feed liquor
Space wherein 2.81 positive pressure range of the second pressurizing valve is 100~500kpa, and uses drying nitrogen, and the first pressure reducing valve 2.72 is negative
Pressure is -50~-100kpa, left and right ends while persistently pressure maintaining 50s, by the 4 inverse injection lithium ion battery ontology of electrolyte that flows back
Inside 3.1, then the first fluid injection cup 2.1,2.2 positive/negative-pressure pipeline pressure release of the second fluid injection cup to normal pressure are controlled respectively；
7, second right circulation fluid injection: in above-mentioned steps 6, the first fluid injection cup 2.1 in negative pressure state because resistance is small, meeting
There is 5%~8% electrolyte 4 to be pumped in the first fluid injection cup 2.1, then 5 process of repeating the above steps completes second right circulation
Fluid injection；
8, second of left circulation fluid injection: during above-mentioned steps 7, the second fluid injection cup 2.2 is in negative pressure state because of resistance
It is small, it has 2%~4% electrolyte 4 and is pumped in the second fluid injection cup 2.2, then to complete second left for 6 process of repeating the above steps
Recycle fluid injection；
9, fluid injection is completed: when the electrolyte 4 in the first fluid injection cup 2.1 and the second fluid injection cup 2.2 all squeezes into lithium-ion electric
Behind 3.1 inside of pond ontology, the liquid level of electrolyte 4 has the space of 1~3mm or so with a distance from cover board 1, can be seen by Fig. 4 enlarged drawing
The first fluid injection cup 2.1, the second fluid injection cup 2.2 both sides can be realized by liquid injection hole and be penetrated through out, so being vacuumized again by unilateral
Mode learns that fluid injection is completed, and vacuum degree can not rise always, therefore can be by negative pressure valve feedback signal to acoustooptic alarm system
Fluid injection is prompted to complete；
10, blow raffinate: after the completion of fluid injection, liquid injecting mouth has raffinate, inputs positive pressure by the pressurizing valve of one of fluid injection cup,
The gas-guide tube of another fluid injection cup is communicated with ambient atmosphere, and 5s is distinguished in pressure maintaining, and raffinate is blown into lithium ion battery ontology.
11, device reset: the above circulation step is coherent to be completed, and 9~10min of time-consuming, then pushes first simultaneously in total
Second central movable guide rod 2.6 of the first central movable guide rod 2.5 of fluid injection cup 2.1, the second fluid injection cup 2.2, and pass through V-shape
Sealing block 2.12 closes liquid injecting mouth 2.11 and liquid injection hole 1.1, the first central movable guide rod 2.5 and the second central movable guide rod 2.6
Reset is lifted, battery is taken out out of fixture, completes fluid injection.
In conjunction with Fig. 6 it is found that the injection process operating time that the present invention designs shortens 2~3 times, and left and right note than before
Perforation can be achieved in liquid cup, and left and right is rectified negative pressure and operated simultaneously, in conjunction with Fig. 7 it is found that the dwell time matches and recycles with pressure size
Number can be adjusted flexibly according to demand；High pressure equipressure fluid injection mode is solved because of the battery swell risk caused by inside and outside differential pressure,
And fluid injection can be completed using hybrid mode, be suitable for the big baby battery of various models according to the liquid absorption amount of different model battery
Fluid injection.
Above embodiments are only best citing, rather than a limitation of the embodiments of the present invention.Except above-described embodiment
Outside, there are also other embodiments by the present invention.All technical solutions formed using equivalent substitution or equivalent transformation, all fall within the present invention
It is required that protection scope.
Claims (9)
1. a kind of diplopore lithium ion cover board, it includes the first liquid injection hole for being separately positioned on cover board both ends, the second liquid injection hole, each
The liquid injection hole is respectively positioned on the top of lithium ion battery A pole piece Yu the angle B pole piece r；It is additionally provided with and is used for and positive and negative anodes on the cover board
The welding site that ear is fixedly connected.
2. diplopore lithium ion cover board according to claim 1, it is characterised in that: the cover board material is aluminium sheet, and model is
AL3003。
3. a kind of rocking chair type priming device, it includes diplopore lithium ion cover board described in any one of claim 1~2, special
Sign is: the positive and negative tab welding of the cover board and lithium ion battery ontology upper end, and each liquid injection hole on the cover board connects
One end of a fluid injection cup is connect, the other end of each fluid injection cup is in parallel with liquid injection pipe, central movable guide rod and gas-guide tube, often
Gas-guide tube described in root connects two branches, and a branch road is equipped with pressurizing valve, and another branch road is equipped with pressure reducing valve.
4. rocking chair type priming device according to claim 3, it is characterised in that: each fluid injection cup bottom be equipped with for
Liquid injection hole sealing connected liquid injecting mouth and V-shaped sealing block.
5. a kind of carry out fluid injection using rocking chair type priming device described in any one of claim 3~4, it includes according to difference
The liquid absorption amount of size battery, using at least one of following three kinds of fluid injection modes；
Only pressurization does not vacuumize: inputting positive pressure by the pressurizing valve of one of fluid injection cup when fluid injection, another fluid injection cup is led
Tracheae is communicated with ambient atmosphere；
Or only vacuumize and be not pressurized: the gas-guide tube of one of fluid injection cup is communicated with ambient atmosphere when fluid injection, another fluid injection
Cup makes lithium ion battery body interior be in negative pressure state by pressure reducing valve；
Or vacuumized in pressurization: positive pressure being inputted by the pressurizing valve of one of fluid injection cup when fluid injection, and passes through another
The pressure reducing valve of fluid injection cup makes lithium ion battery body interior be in negative pressure state.
6. rocking chair type electrolyte filling method according to claim 5, it is characterised in that: it includes following detailed process:
1) vacuumize detect entire priming device air-tightness it is whether qualified, if after pressure maintaining vacuum degree change, by liquid injection pipe to
Electrolyte is injected in fluid injection cup；Central movable guide rod lifts reset, and the V-shape sealing block in fluid injection cup bottom liquid injecting mouth produces
Raw displacement, internal negative pressure separately flow into electrolyte at the top of A pole piece, enter electricity at the top of B pole piece and along the angle A pole piece R, B battery core R angular flux
Bottom of pond portion；Electrolyte flows into 55~65%；
2) positive pressure is inputted by the pressurizing valve of one of fluid injection cup, and lithium-ion electric is made by the pressure reducing valve of another fluid injection cup
Pond body interior is in negative pressure state, flows into remaining electrolyte in lithium ion battery ontology, then reversed alternate cycles operation note
The pressurizing valve and pressure reducing valve of liquid cup, until fluid injection is completed.
7. rocking chair type electrolyte filling method according to claim 6, it is characterised in that: after the completion of fluid injection, liquid injecting mouth has raffinate, passes through
The pressurizing valve of one of fluid injection cup inputs positive pressure, and the gas-guide tube of another fluid injection cup communicates with ambient atmosphere, raffinate is blown into
In lithium ion battery ontology.
8. according to rocking chair type electrolyte filling method described in claim 6~7, it is characterised in that: after the completion of fluid injection in forming and capacity dividing, beat
Open the pressure reducing valve vacuumizing and exhausting of each fluid injection cup.
9. according to rocking chair type electrolyte filling method described in claim 6~7, it is characterised in that: the pressure reducing valve of each gas-guide tube is also connected with
Acoustooptic alarm system.
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| CN201910666200.3A CN110416445A (en) | 2019-07-23 | 2019-07-23 | Diplopore lithium ion cover board and its rocking chair type priming device and method |
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| CN112713367A (en) * | 2021-01-11 | 2021-04-27 | 湖北亿纬动力有限公司 | Device for improving liquid loss of battery and formation method |
| CN112736376A (en) * | 2021-01-27 | 2021-04-30 | 湖北亿纬动力有限公司 | Liquid injection device and liquid injection method for battery |
| CN114552147A (en) * | 2022-03-21 | 2022-05-27 | 深圳市格林晟科技有限公司 | Internal circulation type battery liquid injection mechanism and liquid injection method thereof |
| CN114552148A (en) * | 2022-03-21 | 2022-05-27 | 深圳市格林晟科技有限公司 | Centrifugal battery liquid injection mechanism and liquid injection method thereof |
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