CN108598357A - Electrolyte filling method for lithium ion battery - Google Patents
Electrolyte filling method for lithium ion battery Download PDFInfo
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- CN108598357A CN108598357A CN201810434800.2A CN201810434800A CN108598357A CN 108598357 A CN108598357 A CN 108598357A CN 201810434800 A CN201810434800 A CN 201810434800A CN 108598357 A CN108598357 A CN 108598357A
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The present invention provides a kind of electrolyte filling method for lithium ion battery, belongs to technical field of lithium ion.Electrolyte filling method includes：Electrolyte is injected in the battery core finished to baking；By battery core the first vacuum, room temperature first environment in stand；Battery core is taken out from first environment, and battery core is stood；For the second time electrolyte is injected to battery core；Battery core is stood under normal temperature condition for the first time；Battery core is stood under the high temperature conditions for the first time；Low current charge is carried out to battery core under the second vacuum environment；Battery core is stood under normal temperature condition for the second time；Battery core is stood under the high temperature conditions for the second time；Third time injects electrolyte to battery core；Third time stands battery core under normal temperature condition；Third time stands battery core under the high temperature conditions；And it charges again to battery core under third vacuum environment.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of electrolyte filling method for lithium ion battery.
Background technology
Lithium ion battery in the world today using more and more extensive, it is also more and more ripe to the correlative study of lithium battery.Electricity
Liquid is solved as in lithium ion battery three big important one of component parts, its research and development are also increasingly subject to the weight of scholar
Depending on.But equally it is that the research of the electrolyte filling method of core point is little affected by the concern of people with application.It is electrolysed in lithium ion battery
Liquid is to ensure that in charge and discharge process the carrier that ion between positive and negative anodes transmits, and electrolyte effect of impregnation in battery core is better, more
Thoroughly, more uniform, lithium ion battery vacuum in advance at change, at change during electrolyte liquid loss amount it is fewer, the SEI films of negative terminal surface
It is formed more uniform, fine and close, stable, further just can guarantee that manufactured lithium battery internal resistance is small, good rate capability, cycle performance
It is excellent etc..So optimization and the liquid injection process for improving lithium ion are extremely important.
The method of existing square lithium ion battery fluid injection mainly passes through vacuum and --- stands --- high pressure --- to stand
It is recycled for one, cycle injects the electrolyte into inside battery for several times.After electrolyte injection, battery needs to stand a period of time, with
Ensure that electrolyte fully infiltrates.This method is relatively low suitable for energy density, and inside battery structure has the lithium ion of excess room
Battery, lithium ion battery for novel high-capacity high-energy density are simultaneously not suitable for.
With the continuous improvement of the market demand, the requirement to square lithium ion battery energy density is also that when the river rises the boat goes up, side
Type lithium battery interior structure design also approaches the limit, and the space that inside leaves electrolyte for is also smaller and smaller.Lithium battery is especially big
Capacity high-energy density square lithium ion battery needs imbibition complete after injecting electrolyte, and the amount of internal free state electrolyte exists
2% hereinafter, just can guarantee subsequent vacuum in advance at change, at change during electrolyte solution loss amount it is few, lithium ion battery finished product electricity
It has excellent performance.
Invention content
The object of the present invention is to provide a kind of electrolyte filling method for lithium ion, which can ensure electrolyte electricity
Complete, the percentage of reduction lithium ion free state electrolyte is infiltrated behind pond.
To achieve the goals above, the present invention provides a kind of electrolyte filling method for lithium ion battery, and this method includes：
Electrolyte is injected in the battery core finished to baking；
By the battery core the first vacuum, room temperature first environment in stand, the value of the air pressure of first vacuum is-
5KPa to -15KPa；
The battery core is taken out from the first environment, and the battery core is stood；
For the second time electrolyte is injected to the battery core；
The battery core is stood under normal temperature condition for the first time；
The battery core is stood under the high temperature conditions for the first time, the value of the temperature of the hot conditions is 42 DEG C to 48
℃；
Low current charge carried out to the battery core under the second vacuum environment, the value of the air pressure of the second vacuum environment is-
The value of 20KPa to -30KPa, the charging current of the low current charge are 0.015C to 0.025C；
The battery core is stood under the normal temperature condition for the second time；
The battery core is stood under the hot conditions for the second time；
Third time injects electrolyte to the battery core；
Third time stands the battery core under the normal temperature condition；
Third time stands the battery core under the hot conditions；And
It charges again to the battery core under third vacuum environment, the value of the air pressure of the third vacuum environment
Value for -50KPa to -70KPa, the charging current of the charging is 0.1C to 0.25C.
Optionally, it is injected before electrolyte in the battery core finished to baking, anode and the cathode of the battery core
The summation of the concentration of hydrone is less than or equal to 500ppm.
Optionally, the value of the humidity of the fluid injection environment of the electrolyte filling method is less than or equal to 1%.
Optionally, it is injected in electrolyte in the battery core finished to baking, the value model of the amount of the electrolyte of injection
Enclose the 62% to 68% of the amount for being the open ended electrolyte of the battery core；
It is injected in electrolyte to the battery core at described second, the value range of the amount of the electrolyte of injection is institute
State the 25% to 30% of the amount of the open ended electrolyte of battery core；
Include to battery core injection electrolyte in the third time：The electricity of the lithium ion battery is injected to the battery core
Solve the 5% to 8% of liquid total amount.
Optionally, it is injected in electrolyte in the battery core finished to baking, the value model of the amount of the electrolyte of injection
Enclose the 64% to 66% of the amount for being the open ended electrolyte of the battery core；
It is injected in electrolyte to the battery core at described second, the value range of the amount of the electrolyte of injection is institute
State the 27% to 29% of the amount of the open ended electrolyte of battery core；
Include to battery core injection electrolyte in the third time：The electricity of the lithium ion battery is injected to the battery core
Solve the 5.5% to 7% of liquid total amount.
Optionally, it is described by the battery core the first vacuum, room temperature first environment in stand in, the standing when
Between be 2h to 4h, the value of the temperature of the room temperature is 22 DEG C to 28 DEG C.
Optionally, the battery core is taken out from the first environment described, during the battery core is stood, the standing
Time is 5min to 10min.
Optionally, the battery core is stood under normal temperature condition in the first time, for the second time by the battery core in room temperature
Under the conditions of stand, for the third time stand the battery core under the normal temperature condition, the value of the temperature of the normal temperature condition is
22 DEG C to 28 DEG C, the value of the time of the standing is 6h to 16h；
The battery core is stood under the high temperature conditions in the first time, second the battery core is quiet under the high temperature conditions
In setting, for the third time standing the battery core under the hot conditions, the value of the temperature of the hot conditions is 42 DEG C to 48
DEG C, the value of the time of the standing is 4h to 12h.
Optionally, the battery core is carried out in low current charge under the second vacuum environment described, the low current fills
The charging time of electricity is 1h, and the charging current of the low current charge is 0.02C to 0.025C.
Optionally, it charges again to the battery core under third vacuum environment described, the charging of the charging
Time is 1h, and the charging current of the charging is 0.15C to 0.2C.
Through the above technical solutions, the electrolyte filling method provided by the present invention for lithium ion battery passes through standing lithium-ion electric
The mode in pond infiltrates complete, the percentage of reduction lithium battery interior free state electrolyte after ensureing electrolyte injection；The fluid injection side
Method is it is also ensured that the lithium battery in fluid injection and after fluid injection charges completely in vacuum environment.Being charged twice respectively can
Preferably the gas generated when charging to be discharged so that anode, diaphragm, cathode are snugly even closer, improve SEI membrane structures
Stability when generation improves first charge discharge efficiency and capacity, improves the electrical properties such as internal resistance, high rate performance, the cycle life of lithium battery.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the flow chart of the electrolyte filling method for lithium ion battery according to embodiment of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
It is the flow of the electrolyte filling method for lithium ion battery according to embodiment of the present invention as shown in Figure 1
Figure.In Fig. 1, which may include：
In step slo, electrolyte is injected in the battery core finished to baking.In this embodiment, which finishes
The value of the summation of the parts per million concentration value of the anode of battery core and the hydrone of cathode can be less than or equal to 500/1000000ths
(500ppm).The value of the amount of the electrolyte of the secondary injection can be the 62% to 68% of the electrolyte total amount of lithium ion battery.
Preferably, the value of the amount of the electrolyte of the secondary injection can be the 64% to 66% of the electrolyte total amount of lithium ion battery.
In step s 11, by the battery core the first vacuum, room temperature first environment in stand.In embodiments, this
The value of the air pressure of one vacuum can be -5 kPas (KPa) extremely -15KPa.The value of the temperature of the room temperature can be, for example, 22 to take the photograph
Family name's degree (DEG C) is to 28 DEG C.The value of the time of the secondary standing can be 2 hours (h) to 4h.
In step s 12, battery core is taken out from first environment, which is stood.In the embodiment of the present invention,
The value of the time of the secondary standing can be 5 minutes (min) to 10min.
In step s 13, electrolyte is injected to battery core second.In this embodiment, the electrolyte of the secondary injection
The value of amount, which can be, for example, the battery core, can accommodate the 25% to 30% of total amount.Preferably, the amount of the electrolyte of the secondary injection
Value, which can be, for example, the battery core, can accommodate the 27% to 29% of total amount.
In step S14, battery core is stood under normal temperature condition for the first time.In this embodiment, the normal temperature condition
The value of temperature can be 22 DEG C to 28 DEG C, and the value of the time of standing can be 6 to 16 hours.Preferably, the secondary standing
The value of time can be 8h to 12h.
In step S15, battery core is stood under the high temperature conditions for the first time.In this embodiment, the hot conditions
Temperature can be 42 DEG C to 48 DEG C, and the value of the time of the standing can be 4 to 12 hours.Preferably, time of the standing
Value can be 6 to 8 hours.
In step s 16, low current charge is carried out to battery core under the second vacuum environment.In this embodiment, this is small
Electric current charging charging current value can be 0.015 discharge-rate (C) to 0.025C, the charging time of low current charge can
Think 1h, the value of the air pressure of the second vacuum environment can be -20KPa to -30KPa.Preferably, the value of the charging current can
Think 0.02C to 0.025C.
In step S17, battery core is stood under normal temperature condition for the second time.In this embodiment, the normal temperature condition
The value of temperature can be 22 DEG C to 28 DEG C, and the value of the time of standing can be 6 to 16 hours.Preferably, the standing when
Between value can be 8 to 12 hours.
In step S18, battery core is stood under the high temperature conditions for the second time.In this embodiment, the hot conditions
Temperature can be 42 DEG C to 48 DEG C, and the value of the time of the secondary standing can be 4 to 12 hours.Preferably, the secondary standing when
Between value can be 6 to 8 hours.
In step S19, electrolyte is injected to battery core for the third time.In this embodiment, the electrolyte of the secondary injection
The value of amount, which can be the battery core, can accommodate the 5% to 8% of total amount.Preferably, the value of the amount of the electrolyte of the secondary injection can
Think that the battery core can accommodate the 5.5% to 7% of total amount.
In step S20, battery core is stood under normal temperature condition for the third time.In this embodiment, the normal temperature condition
The value of temperature can be 22 DEG C to 28 DEG C, and the value of the time of the secondary standing can be 6h to 16h.Preferably, the secondary standing
The value of time can be 8h to 12h.
In the step s 21, battery core is stood under the high temperature conditions for the third time.In this embodiment, the hot conditions
The value of temperature can be 42 DEG C to 48 DEG C, and the value of the time of the secondary standing can be 4h to 12h.Preferably, the secondary standing
The value of time can be 6h to 8h.
In step S22, charged to battery core again under third vacuum environment to obtain the finished battery of the battery core.
In this embodiment, the charging time of the secondary charging can be 1 hour, the value of the air pressure of third vacuum environment can be-
50KPa to -70KPa.The value of the electric current of the secondary charging is 0.1C to 0.25C.Preferably, the value of the electric current can be
0.15C to 0.2C.
In addition, in an embodiment of the invention, the fluid injection ring of the fluid injection, second of fluid injection and third time fluid injection
The value of humidity in border can be less than or equal to 1%.
Embodiment 1
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 351ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 65%；Then battery core is stood into 2h at -10KPa；Battery core is then taken out, and stands 5min again；
Electrolyte (amount of electrolyte is the 28% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core then stands to after 10h (42) stand 8h at high temperature again under room temperature (22 DEG C)；Then under vacuum (-
Under 25KPa), with the electric current of 0.02C to battery core charging 1h；Then stand 10h at normal temperatures, then at high temperature (42 DEG C) standing
8h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
7%), and battery core is stood into 10h at normal temperatures, then (42 DEG C) standing 8h at high temperature；Again under vacuum by battery core
(- 55KPa), with the electric current charging 1h of 0.17C.
Test：180Ah batteries existing to 3 groups carry out fluid injection according to the method for embodiment 1, are respectively labeled as group 1, group 2
With group 3, the liquid loss amount after 3 groups of battery chargings is then detected respectively, and is recycled 1000 times and protected with the capacity after recycling 2000 times
Holdup R, experimental result are as shown in table 1.Test method is as follows：
Liquid loss amount after low current charge is that battery core is obtained after carrying out low current charge by way of measuring quality
Loss electrolyte quality, unit be gram (g)；Liquid loss amount is to lead to after battery core is charged in third vacuum environment after charging
It crosses and measures the quality for losing electrolyte that the mode of quality obtains.
Loop test mode：It at 25 DEG C, is charged with constant voltage charging method, limitation electric current is 9A, and final voltage is
3.65V is discharged in a manner of constant-current discharge, discharge current 180A, and the blanking voltage of electric discharge is 2.5V, respectively record cycle
Battery capacity C1 and C2 after 1000 times and 2000 times, and calculate the capacity retention ratio after recycling 1000 times and 2000 times the 1st time
R。
R1000=C1/ initial capacity × 100%；
R2000=C2/ initial capacity × 100%.
Table 1
Embodiment 2
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 326ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 65%；Then battery core is stood into 2h at -10KPa；Battery core is then taken out, and stands 5min again；
Electrolyte is injected into the battery core after standing, and (amount of electrolyte is the electrolyte total amount of lithium ion battery
28.5%), battery core is then stood under room temperature (22 DEG C) to after 10h (42 DEG C) standing 6h at high temperature again；Then in vacuum item
Under part under (- 25KPa), with the electric current of 0.025C to battery core charging 1h；Then 10h is stood at normal temperatures, then at high temperature (42
DEG C) stand 6h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
6.5%), and battery core is stood into 10h at normal temperatures, then (42 DEG C) standing 6h at high temperature；Again by battery core in vacuum condition
Under (- 60KPa), charged 1h with the electric current of 0.2C.
Test：180Ah size batteries existing to 3 groups according to embodiment 2 method carry out fluid injection, be respectively labeled as group 4,
Group 5 and group 6, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and the capacity after cycle 1000 times and cycle 2000 times
Conservation rate R, experimental result are as shown in table 2.Test method is the same as embodiment 1.
Table 2
Embodiment 3
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 337ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 65%；Then battery core is stood into 2h at -10KPa；Battery core is then taken out, and stands 5min again；
Electrolyte is injected into the battery core after standing, and (amount of electrolyte is the electrolyte total amount of lithium ion battery
28.3%), battery core is then stood under room temperature (22 DEG C) to after 8h (42 DEG C) standing 10h at high temperature again；Then in vacuum item
Under part under (- 30KPa), with the electric current of 0.025C to battery core charging 1h；Then 8h is stood at normal temperatures, then at high temperature (42
DEG C) stand 10h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
6.7%), and battery core is stood into 8h at normal temperatures, then (42 DEG C) standing 10h at high temperature；Again by battery core in vacuum condition
Under (- 60KPa), charged 1h with the electric current of 0.2C.
Test：180Ah size batteries existing to 3 groups according to embodiment 2 method carry out fluid injection, be respectively labeled as group 7,
Group 8 and group 9, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and the capacity after cycle 1000 times and cycle 2000 times
Conservation rate R, experimental result are as shown in table 3.Test method is the same as embodiment 1.
Table 3
Embodiment 4
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 500ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 62%；Then battery core is stood into 2h at -5KPa；Battery core is then taken out, and stands 5min again；
Electrolyte (amount of electrolyte is the 30% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core is then stood to after 8h (45 DEG C) standing 4h at high temperature again under room temperature (25 DEG C)；Then under vacuum (-
Under 20KPa), with the electric current of 0.015C to battery core charging 1h；Then stand 8h at normal temperatures, then at high temperature (45 DEG C) standing
4h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
8%), and battery core is stood into 8h at normal temperatures, then (45 DEG C) standing 4h at high temperature；Again by battery core under vacuum (-
50KPa), with the electric current of 0.1C charging 1h.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 4, are respectively labeled as group
10, group 11 and group 12, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 4.Test method is the same as embodiment 1.
Table 4
Embodiment 5
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 331ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 64%；Then battery core is stood into 3h at -15KPa；Battery core is then taken out, and stands 7.5min again；
Electrolyte (amount of electrolyte is the 29% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core is then stood to after 9h (48 DEG C) standing 7h at high temperature again under room temperature (28 DEG C)；Then under vacuum (-
Under 30KPa), with the electric current of 0.02C to battery core charging 1h；Then stand 9h at normal temperatures, then at high temperature (48 DEG C) standing
7h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
7%), and battery core is stood into 9h at normal temperatures, then (48 DEG C) standing 7h at high temperature；Again by battery core under vacuum (-
70KPa), with the electric current of 0.15C charging 1h.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 5, are respectively labeled as group
13, group 14 and group 15, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 5.Test method is the same as embodiment 1.
Table 5
Embodiment 6
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 345ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 66%；Then battery core is stood into 4h at -15KPa；Battery core is then taken out, and stands 10min again；
Electrolyte (amount of electrolyte is the 28% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core is then stood to after 12h (45 DEG C) standing 8h at high temperature again under room temperature (25 DEG C)；Then under vacuum (-
Under 30KPa), with the electric current of 0.025C to battery core charging 1h；Then 12h is stood at normal temperatures, and then (45 DEG C) are quiet at high temperature
Set 8h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
6%), and battery core is stood into 12h at normal temperatures, then (45 DEG C) standing 8h at high temperature；Again under vacuum by battery core
(- 50KPa), with the electric current charging 1h of 0.175C.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 6, are respectively labeled as group
16, group 17 and group 18, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 6.Test method is the same as embodiment 1.
Table 6
Embodiment 7
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 345ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 65%；Then battery core is stood into 4h at -15KPa；Battery core is then taken out, and stands 10min again；
Electrolyte is injected into the battery core after standing, and (amount of electrolyte is the electrolyte total amount of lithium ion battery
28.5%), battery core is then stood under room temperature (25 DEG C) to after 16h (45 DEG C) standing 12h at high temperature again；Then in vacuum item
Under part under (- 30KPa), with the electric current of 0.0225C to battery core charging 1h；Then 16h is stood at normal temperatures, then at high temperature
(45 DEG C) standing 12h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
6.5%), and battery core is stood into 16h at normal temperatures, then (45 DEG C) standing 12h at high temperature；Again by battery core in vacuum condition
Under (- 50KPa), charged 1h with the electric current of 0.25C.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 7, are respectively labeled as group
19, group 20 and group 21, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 7.Test method is the same as embodiment 1.
Table 7
Embodiment 8
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 356ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 67%；Then battery core is stood into 4h at -15KPa；Battery core is then taken out, and stands 10min again；
Electrolyte (amount of electrolyte is the 25% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core is then stood to after 12h (45 DEG C) standing 8h at high temperature again under room temperature (25 DEG C)；Then under vacuum (-
Under 30KPa), with the electric current of 0.025C to battery core charging 1h；Then 12h is stood at normal temperatures, and then (45 DEG C) are quiet at high temperature
Set 8h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
8%), and battery core is stood into 12h at normal temperatures, then (45 DEG C) standing 8h at high temperature；Again under vacuum by battery core
(- 50KPa), with the electric current charging 1h of 0.25C.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 8, are respectively labeled as group
22, group 23 and group 24, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 8.Test method is the same as embodiment 1.
Table 8
Embodiment 9
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 361ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 64.5%；Then battery core is stood into 4h at -15KPa；Battery core is then taken out, and stands 10min again；
Electrolyte (amount of electrolyte is the 30% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core is then stood to after 12h (45 DEG C) standing 8h at high temperature again under room temperature (25 DEG C)；Then under vacuum (-
Under 30KPa), with the electric current of 0.025C to battery core charging 1h；Then 12h is stood at normal temperatures, and then (45 DEG C) are quiet at high temperature
Set 8h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
5.5%), and battery core is stood into 12h at normal temperatures, then (45 DEG C) standing 8h at high temperature；Again by battery core in vacuum condition
Under (- 50KPa), charged 1h with the electric current of 0.175C.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 9, are respectively labeled as group
25, group 26 and group 27, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 9.Test method is the same as embodiment 1.
Table 9
Embodiment 10
Inject electrolyte in the battery core finished to baking, the battery core which finishes anode and cathode hydrone it is dense
The summation of degree is 345ppm；The amount of the electrolyte of the secondary injection is that (battery core is open ended for the electrolyte total amount of lithium ion battery
Total amount) 68%；Then battery core is stood into 4h at -15KPa；Battery core is then taken out, and stands 10min again；
Electrolyte (amount of electrolyte is the 27% of the electrolyte total amount of lithium ion battery) is injected into the battery core after standing,
Battery core is then stood to after 12h (45 DEG C) standing 8h at high temperature again under room temperature (25 DEG C)；Then under vacuum (-
Under 30KPa), with the electric current of 0.025C to battery core charging 1h；Then 12h is stood at normal temperatures, and then (45 DEG C) are quiet at high temperature
Set 8h；
Third time injects electrolyte into battery core, and (amount of the electrolyte of the secondary injection is the electrolyte total amount of lithium ion battery
5%), and battery core is stood into 12h at normal temperatures, then (45 DEG C) standing 8h at high temperature；Again under vacuum by battery core
(- 50Pa), with the electric current charging 1h of 0.175C.
Test：180Ah size batteries existing to 3 groups carry out fluid injection according to the method for embodiment 10, are respectively labeled as group
28, group 29 and group 30, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and after cycle 1000 times and cycle 2000 times
Capacity retention ratio R, experimental result is as shown in table 10.Test method is the same as embodiment 1.
Table 10
Comparative example
The summation of the parts per million concentration value of the hydrone of battery core (after baking) positive and negative electrode to be injected is 351ppm.
The cycle that (10min times) --- high pressure (100KPa) --- stands (10min times) --- is stood using vacuum (- 85KPa)
Mode recycles 12 times and injects the electrolyte into inside battery.Battery core shelves 8h under the conditions of room temperature (25 DEG C) after fluid injection, then in height
Shelve 8h under the conditions of warm (45 DEG C), then charge to the battery core under vacuum environment (- 50KPa) with obtain the battery core at
Product battery.
Test：180Ah size batteries existing to 3 groups according to comparative example method carry out fluid injection, be respectively labeled as group 31,
Group 32 and group 33, then detect the liquid loss amount after the charging of 3 groups of batteries respectively, and the appearance after cycle 1000 times and cycle 2000 times
Conservation rate R is measured, experimental result is as shown in table 11.Test method is the same as embodiment 1.
Table 11
The value of the humidity of fluid injection environment in above example and comparative example is 0.5%.
In conjunction with the data in table 1 to table 10 and table 11 it is found that charging again to battery core under third vacuum environment
Afterwards, the liquid loss amount of battery core is significantly less than the battery core in table 11 (comparative example).In addition, the battery core in table 1 to table 10 is using 1000
It is secondary and 2000 times after remaining service life also be significantly greater than table 11 in battery core.It can be seen that provided by the present invention for lithium
The electrolyte filling method of ion battery can improve the production efficiency of lithium battery and the service life of lithium battery.
Through the above technical solutions, the electrolyte filling method provided by the present invention for lithium ion battery passes through standing lithium-ion electric
The mode in pond infiltrates complete, the percentage of reduction lithium battery interior free state electrolyte after ensureing electrolyte injection；The fluid injection side
Method is it is also ensured that the lithium battery in fluid injection and after fluid injection charges completely in vacuum environment.Being charged twice respectively can
Preferably the gas generated when charging to be discharged so that anode, diaphragm, cathode are snugly even closer, improve SEI membrane structures
Stability when generation improves first charge discharge efficiency and capacity, improves the electrical properties such as internal resistance, high rate performance, the cycle life of lithium battery.
Above in association with attached drawing be described in detail the present invention optional embodiment, still, the present invention is not limited to it is above-mentioned can
The detail in embodiment is selected, within the scope of the technical concept of the present invention, technical scheme of the present invention can be carried out more
Kind simple variant, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, embodiment of the present invention
Various combinations of possible ways are no longer separately illustrated.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention embodiment equally should be considered as embodiment of the present invention disclosure of that.
Claims (10)
1. a kind of electrolyte filling method for lithium ion battery, which is characterized in that the electrolyte filling method includes：
Electrolyte is injected in the battery core finished to baking；
By the battery core the first vacuum, room temperature first environment in stand, the value of the air pressure of first vacuum is -5KPa
To -15KPa；
The battery core is taken out from the first environment, and the battery core is stood；
For the second time electrolyte is injected to the battery core；
The battery core is stood under normal temperature condition for the first time；
The battery core is stood under the high temperature conditions for the first time, the value of the temperature of the hot conditions is 42 DEG C to 48 DEG C；
Low current charge carried out to the battery core under the second vacuum environment, the value of the air pressure of second vacuum environment is-
The value of 20KPa to -30KPa, the charging current of the low current charge are 0.015C to 0.025C；
The battery core is stood under the normal temperature condition for the second time；
The battery core is stood under the hot conditions for the second time；
Third time injects electrolyte to the battery core；
Third time stands the battery core under the normal temperature condition；
Third time stands the battery core under the hot conditions；And
It charging again to the battery core under third vacuum environment, the value of the air pressure of the third vacuum environment is-
The value of 50KPa to -70KPa, the charging current of the charging are 0.1C to 0.25C.
2. electrolyte filling method according to claim 1, which is characterized in that inject electrolysis in the battery core finished to baking
Before liquid, the summation of the concentration of the anode of the battery core and the hydrone of cathode is less than or equal to 500ppm.
3. electrolyte filling method according to claim 1, which is characterized in that the humidity of the fluid injection environment of the electrolyte filling method takes
Value is less than or equal to 1%.
4. electrolyte filling method according to claim 1, which is characterized in that inject electrolysis in the battery core finished to baking
In liquid, the value range of the amount of the electrolyte of injection is the 62% to 68% of the amount of the open ended electrolyte of the battery core；
It is injected in electrolyte to the battery core at described second, the value range of the amount of the electrolyte of injection is the electricity
The 25% to 30% of the amount of the open ended electrolyte of core；
Include to battery core injection electrolyte in the third time：The electrolyte of the lithium ion battery is injected to the battery core
The 5% to 8% of total amount.
5. electrolyte filling method according to claim 4, which is characterized in that inject electrolysis in the battery core finished to baking
In liquid, the value range of the amount of the electrolyte of injection is the 64% to 66% of the amount of the open ended electrolyte of the battery core；
It is injected in electrolyte to the battery core at described second, the value range of the amount of the electrolyte of injection is the electricity
The 27% to 29% of the amount of the open ended electrolyte of core；
Include to battery core injection electrolyte in the third time：The electrolyte of the lithium ion battery is injected to the battery core
The 5.5% to 7% of total amount.
6. electrolyte filling method according to claim 1, which is characterized in that it is described by the battery core in the first vacuum, room temperature
First environment in stand, time of the standing is 2h to 4h, the value of the temperature of the room temperature is 22 DEG C to 28 DEG C.
7. electrolyte filling method according to claim 1, which is characterized in that take out the electricity from the first environment described
Core, during the battery core is stood, the time of the standing is 5min to 10min.
8. electrolyte filling method according to claim 1, which is characterized in that in the first time by the battery core in normal temperature condition
It is lower to stand, second stand the battery core under normal temperature condition, for the third time standing the battery core under the normal temperature condition
In, the value of the temperature of the normal temperature condition is 22 DEG C to 28 DEG C, and the value of the time of the standing is 6h to 16h；
The battery core stood under the high temperature conditions in the first time, stood the battery core under the high temperature conditions second,
During third time stands the battery core under the hot conditions, the value of the temperature of the hot conditions is 42 DEG C to 48 DEG C,
The value of the time of the standing is 4h to 12h.
9. electrolyte filling method according to claim 1, which is characterized in that it is described under the second vacuum environment to the battery core
It carries out in low current charge, the charging time of the low current charge is 1h, and the charging current of the low current charge is 0.02C
To 0.025C.
10. electrolyte filling method according to claim 1, which is characterized in that it is described under third vacuum environment again to institute
It states during battery core charged, the charging time of the charging is 1h, and the charging current of the charging is 0.15C to 0.2C.
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| CN109326827A (en) * | 2018-10-15 | 2019-02-12 | 珠海光宇电池有限公司 | A kind of standing method after lithium ion battery liquid injection |
| CN109921093A (en) * | 2019-03-19 | 2019-06-21 | 山西沃特海默新材料科技股份有限公司 | A kind of lithium-ion battery electrolytes system, electrolyte filling method and the battery being prepared |
| CN114597594A (en) * | 2022-03-29 | 2022-06-07 | 厦门海辰新能源科技有限公司 | Battery, terminal and method for manufacturing battery |
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