CN109860726A - Lithium battery manufacturing process - Google Patents
Lithium battery manufacturing process Download PDFInfo
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- CN109860726A CN109860726A CN201811602746.4A CN201811602746A CN109860726A CN 109860726 A CN109860726 A CN 109860726A CN 201811602746 A CN201811602746 A CN 201811602746A CN 109860726 A CN109860726 A CN 109860726A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a kind of lithium battery manufacturing process, including pretreatment procedure, the first roasting procedure, assembling procedure, the second roasting procedure, fluid injection infiltration process, sealing process, shelve infiltration process and formation process.Lithium battery manufacturing process disclosed by the invention, pass through the baking of the first roasting procedure and the second roasting procedure, the moisture of inside battery can be efficiently removed to improve the comprehensive performance of battery, and does not have to that drying temperature is significantly increased during toasting and extend baking time, it will not have a negative impact to the performance of battery, and bigger energy consumption will not be brought；In addition, the phenomenon that by the vacuum pressure after improving the temperature of semi-finished product battery, increasing fluid injection and extending the dwell time, be not in analysis lithium on pole piece, effectively improving the effect of impregnation of electrolyte in fluid injection infiltration process；Further, by increasing the injection rate of anode, the content of negative electrode active material and electrolyte, the energy density of lithium battery is effectively improved.
Description
Technical field
The present invention relates to field of lithium more particularly to a kind of lithium battery manufacturing process.
Background technique
Inorganic lithium salt is ingredient important in ion battery electrolyte, and chemical conversion will be generated instead by meeting water due to inorganic lithium salt
It answers, seriously affects the comprehensive performance of battery.Therefore in lithium ion battery manufacturing process, especially to the removal of inside battery moisture
It is important.There is one of baking process in existing lithium battery manufacturing process, carries out baking water removal using vacuum oven.It is straight for battery
Diameter is bigger, height higher (such as diameter >=18mm, height >=65mm) cylindrical lithium ion battery, and extension is usually used and toasts
Time improves baking temperature to reduce the moisture of inside battery.But there are some defects for this mode, since battery fills
After matching, inside battery belongs to hemi-closure space, and the moisture inside core is difficult to be removed completely.Meanwhile baking temperature mistake
Height can make core diaphragm retracts, and porosity reduces, and generate negative impact to the performance of battery, and baking time is too long, can draw
The agent aging of pole piece internal bond is played, pole piece material is easy to fall off, and battery performance is caused to reduce.In addition, using baking time is extended
Or the roasting mode of raising baking temperature also brings along more energy consumptions.
In addition, inside battery material just can be carried out formation charging after must being infiltrated by electrolyte in lithium battery manufacturing process,
The purpose of infiltration is to allow electrolyte to be substantially filled between inside battery pole piece material particle, in the hole of diaphragm material, in turn
Ensure the security performance of battery and the performance of electrical property；If electrolyte infiltration is bad, negative electrode tab " analysis lithium " phenomenon can be caused
(i.e. the lithium ion of anode abjection is appeared on cathode after reaching cathode with the state of lithium simple substance, and silvery white state is presented), in turn
The comprehensive performance for reducing battery, can seriously cause safety accident.In electrolyte impregnation process, condition locating for battery and infiltration side
Formula has significant impact to effect of impregnation.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention discloses a kind of lithium battery manufacturing process, to solve existing lithium
In battery manufacturing process, lithium battery stoving process cannot completely remove the moisture inside battery roll core or will lead to battery performance
The problem of reducing and electrolyte effect of impregnation is bad, causing negative electrode tab analysis lithium phenomenon occur, battery comprehensive performance is caused to reduce.
The present invention adopts the following technical scheme that realization:
A kind of lithium battery manufacturing process, comprising:
Preparation section prepares pole piece or core；
The pole piece or the core are put into oven and are toasted by the first roasting procedure；
Assembling procedure will be installed by the pole piece coiling of first roasting procedure at core, and by the core
Semi-finished product battery is made inside with battery case open at one end, alternatively, by by the volume of the first roasting procedure
Core be installed on inside battery case open at one end semi-finished product battery is made；
The semi-finished product battery for completing the assembling procedure is put into oven and is toasted by the second roasting procedure；
Fluid injection infiltrates process, is T in temperature after completing second roasting procedure1The semi-finished product battery in infuse
Enter electrolyte, the amount of the electrolyte of injection is M, the semi-finished product battery is moved into vacuum tank after completing fluid injection, and to described
The inside of vacuum tank vacuumize until the vacuum degree in the vacuum tank reaches P, dwell time t, wherein T1=65 DEG C
± 5 DEG C, P=(- 0.070) MPa~(- 0.060) MPa, t=70s~90s, M=9.30 ± 0.2g；
Sealing process seals so that finished product electricity is made the semi-finished product battery for completing the fluid injection infiltration process
Pond；
Infiltration process is shelved, the finished battery for completing the sealing process is first stood upside down and shelves infiltration, then is uprightly put
Set infiltration；
The finished battery that infiltration process is shelved described in completion is carried out charge and discharge by formation process.
Preferably, first roasting procedure includes:
First substep, the pole piece or the core are put into oven, are vacuumized to oven inside until in oven
The vacuum degree in portion isSetting baking temperature is 95 ± 5 DEG C and toasts to the core, toasts duration 10
±1min；
Second substep is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
95 ± 5 DEG C of degree toasts the pole piece or the core, and to continuing air blast inside the oven, and baking duration 10 ±
1min；
Third substep, keeps the vacuum degree of ovenBaking temperature is reduced to 90 ± 5 DEG C to described
Pole piece or the core are toasted, and to air blast is continued inside the oven, toast 60 ± 1min of duration；
4th substep vacuumizes oven inside until the vacuum degree inside oven isSetting is dried
Roasting 90 ± 5 DEG C of temperature toasts the pole piece or the core, toasts 5 ± 1min of duration；
5th substep is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
90 ± 5 DEG C of degree toasts the pole piece or the core, and to continuing air blast inside the oven, and baking duration 30 ±
1min；
The 4th substep and the 5th substep are circuited sequentially, when circulation is 17 ± 7 weeks a length of；
And/or second roasting procedure includes:
First sub-step puts the semi-finished product battery in oven into, is vacuumized to oven inside until true inside oven
Reciprocal of duty cycle isSetting baking temperature is 95 ± 5 DEG C and toasts to the semi-finished product battery, toasts duration 10
±1min；
Second sub-step is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
95 ± 5 DEG C of degree toasts the semi-finished product battery, and to air blast is continued inside the oven, toasts 10 ± 1min of duration；
Third sub-step keeps the vacuum degree of ovenAnd to air blast is continued inside the oven, will dry
Roasting temperature is reduced to 90 ± 5 DEG C and toasts to the semi-finished product battery, toasts 60 ± 1min of duration；
4th sub-step vacuumizes oven inside until the vacuum degree inside oven isSetting is dried
Roasting 90 ± 5 DEG C of temperature toasts the semi-finished product battery, toasts 5 ± 1min of duration；
5th sub-step is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
90 ± 5 DEG C of degree toasts the semi-finished product battery, and to air blast is continued inside the oven, toasts 30 ± 1min of duration；
Circuit sequentially the 4th sub-step and the 5th sub-step, when circulation is 60 ± 5 weeks a length of.
Preferably, it is described shelve infiltration process include by the finished battery temperature be T2Under conditions of first stand upside down 18-
For 24 hours, then upright 12-24h, T2=35 ± 10 DEG C.
Preferably, the vacuum tank is set in glove box, and the temperature inside the glove box is 21 ± 6 DEG C, and humidity is small
In or equal to 2.0%RH.
Preferably, the assembling procedure is 20 ± 5 DEG C in temperature, and humidity carries out under conditions of being less than or equal to 25%RH；
And/or
First roasting procedure terminates to the interval time for entering second roasting procedure to be less than or equal to 4 hours；
And/or
The height of the finished battery is 102 ± 4mm.
Preferably, the preparation section specifically includes:
Cutting action is cut into the positive plate that width is 94.5 ± 5mm and the negative electrode tab that width is 96.0 ± 5mm, described
Positive plate includes cathode metal substrate and coated in the positive coating outside the cathode metal substrate；
Anode ear is welded on the positive plate by film-making process, by the first negative pole lug welding the one of the negative electrode tab
End, by the second negative pole lug welding negative electrode tab the other end；
Rolling step by the positive plate for being welded with anode ear, is welded with the negative electrode tab of the first negative electrode lug and the second negative electrode lug
And diaphragm by outside to inside according to " the first diaphragm/negative electrode tab/the second diaphragm/positive plate " laminated structure and be wound into core.
Preferably, the compacted density of the positive plate is less than or equal to 4.3g/cm3, negative electrode tab compacted density be less than or
Equal to 1.8g/cm3；And/or
The anode ear is welded at the 1/2-2/3 of the positive plate length direction.
Preferably, the rolling step includes first carrying out pre-roll 1.0-2.0 to first diaphragm and second diaphragm
After circle, it is put into the negative electrode tab, after negative electrode tab pre-roll 1.5-2.7 circle, is put into the positive plate, it is pre- to the positive plate
After rolling up 1.0-2.0 circle, integrally it is wound into cylindric and fixes to form the core.
Preferably, the positive coating includes LiFePO 4 material, and the formation process includes:
First substep is charged to the finished battery with constant current 0.2C, and during the charging process, charging upper limit is arranged
Voltage is 3650mV, entire charging duration 120min；
Second substep is charged to the finished battery after completing first substep with constant current 0.3C, and filled
In electric process, setting charging upper limit voltage is 3650mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, limits charging duration 230min；
Third substep will complete the finished battery after second substep and stand 5min；
4th substep is charged to the finished battery after completing the third substep with constant current 0.5C, and filled
In electric process, setting charging upper limit voltage is 3650mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep continues the finished battery for completing the 5th substep under conditions of constant current is 0.5C
Electric discharge, and during discharge, setting electric discharge lower voltage limit is 2000mV, limitation electric discharge duration 150min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and filled
Charging voltage is controlled in electric process and gradually rises up to 3300mV, then keeps charging voltage 3300mV constant, then control charging electricity
Stream gradually decreases down 0.01C, and charging terminates, and entire charging process duration is limited to 200min；
Wherein, C is the rated capacity of the lithium battery.
Preferably, the positive coating includes ternary material, and the formation process includes:
First substep is charged to the finished battery with constant current 0.2C, and during the charging process, charging voltage is arranged
The upper limit is 4200-4400mV, entire charging duration 120min；
Second substep is charged to the finished battery for completing first substep with constant current 0.3C, and charged
In the process, the setting charging voltage upper limit is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage not
Become, then controls charging current and gradually decrease down 0.01C, stop charging, entire charging duration 300min；
Third substep will complete the finished battery after second substep and stand 5min；
4th substep is charged to the finished battery for completing the third substep with constant current 0.5C, and charged
In the process, the setting charging voltage upper limit is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage not
Become, then controls charging current and gradually decrease down 0.01C, stop charging, entire charging duration 200min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep continues the finished battery for completing the 5th substep under conditions of constant current is 0.5C
Electric discharge, and during discharge, setting electric discharge lower voltage limit is 2500-3000mV, limitation electric discharge duration 150min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and filled
In electric process, setting charging upper limit voltage is 3850mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
Or, the formation process includes:
First substep is charged with constant current 0.02C to the finished battery, and during the charging process, in setting charging
Voltage limit is 3850mV, entire charging duration 60min；
Second substep is charged to the finished battery after completing first substep with constant current 0.1C, and filled
In electric process, setting charging upper limit voltage is 3850mV, entire charging duration 120min；
Third substep is charged to the finished battery after completing second substep with constant current 0.2C, and filled
In electric process, setting charging upper limit voltage is 3850mV, entire charging duration 240min；
4th substep is charged to the finished battery for completing the third substep with constant current 0.3C, and charged
In the process, setting charging upper limit voltage is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage not
Become, then controls charging current and gradually decrease down 0.01C, stop charging, entire charging duration 300min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep continues the finished battery for completing the 5th substep under conditions of constant current is 0.5C
Electric discharge, and during discharge, setting electric discharge lower voltage limit is 2500-3000mV, limitation electric discharge duration 200min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and filled
In electric process, setting charging upper limit voltage is 3850mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
Wherein, C is the rated capacity of the lithium battery.
Compared with prior art, the beneficial effects of the present invention are:
Lithium battery manufacturing process provided by the invention is by first carrying out the first roasting procedure S20 for pole piece or core to go
Manufactured semi-finished product battery is toasted except the moisture of part in pole piece or core, then the second roasting procedure S40.It should
Design method can efficiently remove the moisture of inside battery by two sections of roasting procedures to improve the comprehensive performance of battery, and
Do not have to that drying temperature is significantly increased during baking and extend baking time, negative shadow will not be generated to the performance of battery
It rings, and bigger energy consumption will not be brought；In addition, in fluid injection infiltration process, by improving the temperature of semi-finished product battery, increasing
Vacuum pressure after servicing fluids and the phenomenon that extend the dwell time, be not in analysis lithium on pole piece, effectively improves electrolyte
Effect of impregnation improves the yields and comprehensive performance of product；Further, by increasing positive, negative electrode active material contain
The injection rate of amount and electrolyte, effectively improves the energy density of lithium battery.
Detailed description of the invention
Fig. 1 is the flow diagram for the lithium battery manufacturing process that the embodiment of the present invention one provides.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
Embodiment one:
Referring to Fig. 1, the embodiment of the present invention one provides a kind of lithium battery manufacturing process S100, comprising:
Preparation section S10 prepares pole piece or core；
First roasting procedure S20, the pole piece or the core are put into oven and are toasted；
Assembling procedure S30 will pacify by the pole piece coiling of first roasting procedure at core, and by the core
Loaded on inside battery case open at one end semi-finished product battery is made, alternatively, by by described in the first roasting procedure
Core be installed on inside battery case open at one end semi-finished product battery is made；
The semi-finished product battery for completing the assembling procedure is put into oven and is toasted by the second roasting procedure S40；
Fluid injection infiltrates process S50, is T in temperature after completing second roasting procedure1The semi-finished product battery in
Electrolyte is injected, the amount of the electrolyte of injection is M, the semi-finished product battery is moved into vacuum tank after completing fluid injection, and to institute
The inside for stating vacuum tank vacuumize until the vacuum degree in the vacuum tank reaches P, dwell time t, wherein T1=65
DEG C ± 5 DEG C, P=(- 0.070) MPa~(- 0.060) MPa, t=70s~90s, M=9.30 ± 0.2g；
Sealing process S60 seals so that finished product is made the semi-finished product battery for completing the fluid injection infiltration process
Battery；
Infiltration process S70 is shelved, the finished battery for completing the sealing process is first stood upside down and shelves infiltration, then uprightly
Shelve infiltration；
The finished battery that infiltration process is shelved described in completion is carried out charge and discharge by formation process S80.
With the design method, in lithium battery manufacturing process S100, by the way that pole piece or core are first carried out the first baking
Process S20 is to remove the moisture of part in pole piece or core, then the second roasting procedure S40 to manufactured semi-finished product battery
It is toasted.The design method can efficiently remove the moisture of inside battery by two sections of roasting procedures to improve battery
Comprehensive performance, and do not have to that drying temperature is significantly increased during toasting and extend baking time, it will not be to the property of battery
It can have a negative impact, and bigger energy consumption will not be brought；In addition, in fluid injection infiltration process, by improving semi-finished product
The temperature of battery, the phenomenon that increasing the vacuum pressure after fluid injection and extending the dwell time, be not in analysis lithium on pole piece, effectively
The effect of impregnation for improving electrolyte, improves the yields and comprehensive performance of product；Further, by increasing the electrolysis injected
The amount of liquid effectively improves the energy density of lithium battery so that the active material of lithium battery interior increases.
Preferably, the first roasting procedure S20 includes:
First substep, the pole piece or the core are put into oven, are vacuumized to oven inside until in oven
The vacuum degree in portion isSetting baking temperature is 95 ± 5 DEG C and dries to the pole piece or the core
It is roasting, toast 10 ± 1min of duration；
Second substep is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
95 ± 5 DEG C of degree toasts the pole piece or the core, and to continuing air blast inside the oven, and baking duration 10 ±
1min；
Third substep, keeps the vacuum degree of ovenBaking temperature is reduced to 90 ± 5 DEG C to described
Pole piece or the core are toasted, and to air blast is continued inside the oven, toast 60 ± 1min of duration；
4th substep vacuumizes oven inside until the vacuum degree inside oven isSetting is dried
Roasting 90 ± 5 DEG C of temperature toasts the pole piece or the core, toasts 5 ± 1min of duration；
5th substep is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
90 ± 5 DEG C of degree toasts the pole piece or the core, and to continuing air blast inside the oven, and baking duration 30 ±
1min；
The 4th substep and the 5th substep are circuited sequentially, when circulation is 17 ± 7 weeks a length of.
Preferably, in second substep and five substep, the concentration for the nitrogen being filled with inside Xiang Suoshu oven is big
In or equal to 99.99%.
With the design method, in second substep, third substep and the 5th substep, by described
Continue the state that air blast makes the gas inside oven be in flowing, circulation inside oven, the temperature inside oven promoted it is fast and
Uniformly, the evaporation of the pole piece or the core moisture can be effectively facilitated.It should be noted that being benefit during air blast
Air circulation is formed in the inside of oven with air blower, the gas inside oven does not form gas exchanges with outside air.
Preferably, the second roasting procedure S40 includes:
First sub-step puts the semi-finished product battery in oven into, is vacuumized to oven inside until true inside oven
Reciprocal of duty cycle isSetting baking temperature is 95 ± 5 DEG C and toasts to the semi-finished product battery, toasts duration 10
±1min；
Second sub-step is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
95 ± 5 DEG C of degree toasts the semi-finished product battery, and to air blast is continued inside the oven, toasts 10 ± 1min of duration；
Third sub-step keeps the vacuum degree of ovenAnd to air blast is continued inside the oven, will dry
Roasting temperature is reduced to 90 ± 5 DEG C and toasts to the semi-finished product battery, toasts 60 ± 1min of duration；
4th sub-step vacuumizes oven inside until the vacuum degree inside oven isSetting is dried
Roasting 90 ± 5 DEG C of temperature toasts the semi-finished product battery, toasts 5 ± 1min of duration；
5th sub-step is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature
90 ± 5 DEG C of degree toasts the semi-finished product battery, and to air blast is continued inside the oven, toasts 30 ± 1min of duration；
Circuit sequentially the 4th sub-step and the 5th sub-step, when circulation is 60 ± 5 weeks a length of.
With the design method, similarly, in second sub-step, the third sub-step and the 5th sub-step, pass through
The gas inside oven is made to be in the state for flowing, recycling to air blast is continued inside the oven, the temperature inside oven mentions
Liter is fast and uniform, can effectively facilitate the evaporation of the pole piece or the core moisture.It should be noted that the process of air blast
In be to form air circulation in the inside of oven using air blower, the gas inside oven does not form gas with outside air and hands over
It changes.
Specifically, the fluid injection infiltration process S50 is in T1It=65 ± 5 DEG C, is carried out under conditions of P=-0.065MPa, pressure maintaining
Duration t=60s；Or, the fluid injection infiltration process S50 is in T1It=65 ± 5 DEG C, is carried out under conditions of P=-0.065MPa, pressure maintaining
Duration t=80s；Or, the fluid injection infiltration process S50 is in T1It=65 ± 5 DEG C, is carried out under conditions of P=-0.070MPa, pressure maintaining
Duration t=60s.With the design method, in fluid injection infiltration process S50, by improving the temperature of semi-finished product battery, increasing fluid injection
Vacuum pressure and extension dwell time afterwards, effectively improve the effect of impregnation of electrolyte, are not in analyse showing for lithium on pole piece
As improving the yields and comprehensive performance of product.
Preferably, it is described shelve infiltration process S70 include by the finished battery temperature be T2Under conditions of first stand upside down
18-24h, then upright 12-24h, T2=35 ± 10 DEG C.Specifically, the infiltration process S70 that shelves is in T2Under conditions of, first stand upside down
For 24 hours, then upright 12h, T2=40 DEG C；Or, the infiltration process S70 that shelves is in T2=under conditions of, it first stands upside down for 24 hours, then uprightly
For 24 hours, T2=40 DEG C；Or, the infiltration process S70 that shelves is in T2Under conditions of, first stand upside down 18h, then upright 18h, T2=35 DEG C.
With the design method, by improving environment temperature locating for finished battery, the placement pattern of invasion for optimizing finished battery (is first fallen
It is vertical, rear upright) and extend infiltrating time, the effect of impregnation of electrolyte is effectively improved, prevents occurring the phenomenon that analysis lithium on pole piece,
Improve the yields and comprehensive performance of product.
Preferably, the vacuum tank is set in glove box, and the temperature inside the glove box is 21 ± 6 DEG C, and humidity is small
In or equal to 2.0%RH.With the design method, it is possible to reduce dry semi-finished product battery largely absorbs the moisture shadow of ambient enviroment
Ring the comprehensive performance of battery.
Preferably, the assembling procedure S30 temperature be 20 ± 5 DEG C, humidity be less than or equal to 25%RH under conditions of into
Row.It is 20 ± 5 DEG C in temperature with the design method, humidity is less than or equal to pole piece or pole piece roll under conditions of 25%RH
Core is assembled into semi-finished product battery, it is possible to reduce pole piece or pole piece scroll by the first roasting procedure S20 baking are reuptaked
The moisture of more ambient enviroment influences the effect for removing moisture removal.
Preferably, the first roasting procedure S20 terminates to the interval time for entering the second roasting procedure S40 to be less than
Or it is equal to 4 hours.With the design method, it is possible to reduce the pole piece or pole piece scroll weight toasted by the first roasting procedure S20
The moisture for newly absorbing more ambient enviroment, influences water removal effect.
Preferably, the height of the finished battery is 103 ± 5mm.
Preferably, the assembling procedure S30 further includes that the core is installed on in battery case open at one end
After portion, slot rolling is extruded in the periphery of one end for offering the opening of the battery case.
The preparation section S10 is specifically included:
Cutting action is cut into the positive plate that width is 94.5 ± 5mm and the negative electrode tab that width is 96.0 ± 5mm, described
Positive plate includes cathode metal substrate and coated in the positive coating outside the cathode metal substrate；
Anode ear is welded on the positive plate by film-making process, by the first negative pole lug welding the one of the negative electrode tab
End, by the second negative pole lug welding negative electrode tab the other end；
Rolling step by the positive plate for being welded with anode ear, is welded with the negative electrode tab of the first negative electrode lug and the second negative electrode lug
And diaphragm by outside to inside according to " the first diaphragm/negative electrode tab/the second diaphragm/positive plate " laminated structure and be wound into core.
With the design method, relative to the width of existing positive plate and negative electrode tab, pass through setting anode in the present embodiment
The width of piece is 94.5 ± 5mm, and the width of negative electrode tab is 96.0 ± 5mm, increases the width of positive plate, to improve positive painting
The dressing amount of layer, namely the auxiliary material amount of positive active material is increased, and then improve the capacity of battery anode slice, it is conducive to be promoted
The energy density of lithium battery；Further, the width for being greater than positive plate by the way that the width of negative electrode tab is arranged, so that cathode after winding
Piece can encase positive plate completely, conducive to the security performance for ensureing lithium battery；Further, by being welded with first in negative electrode tab
Negative electrode lug and the second negative electrode lug, two negative electrode lugs can reduce the resistance of battery, improve the large current discharging capability of battery, so that
The lithium battery can be adapted for power battery field.
Preferably, using the first welding current I1By the first negative electrode lug and the second negative pole lug welding in the battery case
Interior bottom, welding duration are t1, using the second welding current I2First negative electrode lug, second negative electrode lug are carried out
Repair welding, welding duration are t2, wherein I1=1.03KA-1.15KA, t1=2.3ms ± 0.2ms, I2=0.79KA-
0.90KA, t2=2.3ms ± 0.2ms.With the design method, by being welded with the first negative electrode lug and the second cathode in negative electrode tab
Ear, two negative electrode lugs can reduce the resistance of battery, improve the large current discharging capability of battery, which is applicable in
In power battery field；Further, the mode welded by using double sections uses the first welding current by the first negative electrode lug
In the interior bottom of the battery case and then use the second welding current to first cathode with the second negative pole lug welding
Ear, second negative electrode lug carry out repair welding, which can make the first negative electrode lug and the second negative electrode lug and battery case
Interior bottom be connected firmly, prevent poor contact, improve the yields and comprehensive performance of product.
Preferably, the compacted density of the positive plate is less than or equal to 4.3g/cm3, negative electrode tab compacted density be less than or
Equal to 1.8g/cm3.With the design method, the compacted density by the way that positive plate is arranged is less than or equal to 4.3g/cm3, negative electrode tab
Compacted density is less than or equal to 1.8g/cm3, be conducive to the infiltration of electrolyte, promote effect of impregnation, improve product yields and
Comprehensive performance.
Preferably, the anode ear is welded at the 1/2-2/3 of the positive plate length direction.It, can with the design method
To reduce the internal resistance of battery, the large current discharging capability of battery is improved.
Preferably, the rolling step includes first carrying out pre-roll 1.0-2.0 to first diaphragm and second diaphragm
After circle, it is put into the negative electrode tab, after negative electrode tab pre-roll 1.5-2.7 circle, is put into the positive plate, it is pre- to the positive plate
After rolling up 1.0-2.0 circle, integrally it is wound into cylindric and fixes to form the core.With the design method, so that after winding
Scroll cross section circularity it is higher, core diameter meets design requirement.
Preferably, the positive coating includes LiFePO 4 material, and the formation process S80 includes:
First substep is charged to the finished battery with constant current 0.2C, and during the charging process, charging upper limit is arranged
Voltage is 3650mV, entire charging duration 120min；
Second substep is charged to the finished battery after completing first substep with constant current 0.3C, and filled
In electric process, setting charging upper limit voltage is 3650mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, limits charging duration 230min；
Third substep will complete the finished battery after second substep and stand 5min；
4th substep is charged to the finished battery after completing the third substep with constant current 0.5C, and filled
In electric process, setting charging upper limit voltage is 3650mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep continues the finished battery for completing the 5th substep under conditions of constant current is 0.5C
Electric discharge, and during discharge, setting electric discharge lower voltage limit is 2000mV, limitation electric discharge duration 150min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and filled
Charging voltage is controlled in electric process and gradually rises up to 3300mV, then keeps charging voltage 3300mV constant, then control charging electricity
Stream gradually decreases down 0.01C, and charging terminates, and entire charging process duration is limited to 200min；
Wherein, C is the rated capacity of the lithium battery.
With the design method, by selecting different electric currents to charge in the different stages, battery charge and discharge is not only improved
Electrical efficiency forms the solid electrolyte film (i.e. SEI film) haveing excellent performance in negative electrode tab graphite and electrolyte interface, effectively anti-
Only in charge and discharge process solvent molecule total insertion, avoid destruction caused by being embedded in altogether electrode material because of solvent molecule, because
And substantially increase the comprehensive performance and service life of battery.
Embodiment two:
The present embodiment and the difference of embodiment one essentially consist in, and the material of positive coating is different, are embodied in step also not
Together, be embodied in: in the present embodiment, the anode coating includes ternary material (nickle cobalt lithium manganate), the formation process S80
Include:
First substep is charged to the finished battery with constant current 0.2C, and during the charging process, charging voltage is arranged
The upper limit is 4200-4400mV, entire charging duration 120min；
Second substep is charged to the finished battery for completing first substep with constant current 0.3C, and charged
In the process, the setting charging voltage upper limit is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage not
Become, then controls charging current and gradually decrease down 0.01C, stop charging, entire charging duration 300min；
Third substep will complete the finished battery after second substep and stand 5min；
4th substep is charged to the finished battery for completing the third substep with constant current 0.5C, and charged
In the process, the setting charging voltage upper limit is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage not
Become, then controls charging current and gradually decrease down 0.01C, stop charging, entire charging duration 200min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep continues the finished battery for completing the 5th substep under conditions of constant current is 0.5C
Electric discharge, and during discharge, setting electric discharge lower voltage limit is 2500-3000mV, limitation electric discharge duration 150min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and filled
In electric process, setting charging upper limit voltage is 3850mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
Wherein, C is the rated capacity of the lithium battery.
With the design method, similarly, by selecting different electric currents to charge in the different stages, battery is not only improved
Efficiency for charge-discharge forms the solid electrolyte film (i.e. SEI film) haveing excellent performance in negative electrode tab graphite and electrolyte interface, has
Effect prevents the total insertion of solvent molecule in charge and discharge process, avoids and breaks caused by being embedded in altogether because of solvent molecule electrode material
It is bad, thus substantially increase the comprehensive performance and service life of battery.
Embodiment three:
The present embodiment and the difference of embodiment one essentially consist in, and the material of positive coating is different, are embodied in step also not
Together, be embodied in: in the present embodiment, the anode coating includes ternary material (nickle cobalt lithium manganate), the formation process S80
Include:
First substep is charged with constant current 0.02C to the finished battery, and during the charging process, in setting charging
Voltage limit is 3850mV, entire charging duration 60min；
Second substep is charged to the finished battery after completing first substep with constant current 0.1C, and filled
In electric process, setting charging upper limit voltage is 3850mV, entire charging duration 120min；
Third substep is charged to the finished battery after completing second substep with constant current 0.2C, and filled
In electric process, setting charging upper limit voltage is 3850mV, entire charging duration 240min；
4th substep is charged to the finished battery for completing the third substep with constant current 0.3C, and charged
In the process, setting charging upper limit voltage is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage not
Become, then controls charging current and gradually decrease down 0.01C, stop charging, entire charging duration 300min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep continues the finished battery for completing the 5th substep under conditions of constant current is 0.5C
Electric discharge, and during discharge, setting electric discharge lower voltage limit is 2500-3000mV, limitation electric discharge duration 200min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and filled
In electric process, setting charging upper limit voltage is 3850mV, after charging voltage rises to setting value, keeps charging voltage constant,
Then control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
Wherein, C is the rated capacity of the lithium battery.
With the design method, similarly, by selecting different electric currents to charge in the different stages, battery is not only improved
Efficiency for charge-discharge forms the solid electrolyte film (i.e. SEI film) haveing excellent performance in negative electrode tab graphite and electrolyte interface, has
Effect prevents the total insertion of solvent molecule in charge and discharge process, avoids and breaks caused by being embedded in altogether because of solvent molecule electrode material
It is bad, thus substantially increase the comprehensive performance and service life of battery.
In order to examine the effect of impregnation of lithium battery manufacturing process S100 provided in an embodiment of the present invention, applicant carried out with
(wherein experimental example one to experimental example four is the specific embodiment of the embodiment of the present invention, and experimental example five is existing for lower five groups of experiments
The specific embodiment of technique):
Experimental example one:
It will be installed at core, and by the core with open at one end by the pole piece coiling of the first baking process S20
Battery case inside semi-finished product battery is made, alternatively, by being installed on by the core of the first baking process S20 with one end
The interior of shell of opening is to be made semi-finished product battery；It is T in temperature1Electrolysis is injected in=65 ± 5 DEG C of the semi-finished product battery
The semi-finished product battery is moved into vacuum tank by liquid after completing fluid injection, and the inside of the vacuum tank vacuumize until
Vacuum degree in the vacuum tank reaches P=-0.065MPa, pressure maintaining duration t=60s；To complete the fluid injection immersion step it
The semi-finished product battery afterwards is sealed so that finished battery is made；By the finished battery in temperature T2Under conditions of=40 DEG C
It first stands upside down for 24 hours, then upright 12h.Then, it is fully charged to take out battery, the Infiltrating of electrolyte liquid, discovery electrolysis are observed in dismantling
Liquid infiltration completely, does not occur " analysis lithium " phenomenon.
Experimental example two:
It will be installed at core, and by the pole piece core with one end by the pole piece coiling of the first baking process S20
Semi-finished product battery is made inside the battery case of opening, alternatively, having being installed on by the core of the first baking process S20
Interior of shell open at one end is to be made semi-finished product battery；It is T in temperature1It is injected in=65 ± 5 DEG C of the semi-finished product battery
The semi-finished product battery is moved into vacuum tank after completing fluid injection, and vacuumizes to the inside of the vacuum tank by electrolyte
Until the vacuum degree in the vacuum tank reaches P=-0.065MPa, pressure maintaining duration t=80s；It will complete the fluid injection infiltration step
The semi-finished product battery after rapid is sealed so that finished battery is made；By the finished battery in temperature T2=40 DEG C of item
It first stands upside down for 24 hours under part, then uprightly for 24 hours.Then, it is fully charged to take out battery, the Infiltrating of electrolyte liquid, discovery are observed in dismantling
Electrolyte infiltration completely, does not occur " analysis lithium " phenomenon.
Experimental example three:
It will be installed at core, and by the pole piece core with one end by the pole piece coiling of the first baking process S20
Semi-finished product battery is made inside the battery case of opening, alternatively, having being installed on by the core of the first baking process S20
Interior of shell open at one end is to be made semi-finished product battery；It is T in temperature1It is injected in=65 ± 5 DEG C of the semi-finished product battery
The semi-finished product battery is moved into vacuum tank after completing fluid injection, and vacuumizes to the inside of the vacuum tank by electrolyte
Until the vacuum degree in the vacuum tank reaches P=-0.065MPa, pressure maintaining duration t=40s；It will complete the fluid injection infiltration step
The semi-finished product battery after rapid is sealed so that finished battery is made；By the finished battery in temperature T2=35 DEG C of item
First stand upside down 18h under part, then upright 18h.Then, it is fully charged to take out battery, the Infiltrating of electrolyte liquid, discovery are observed in dismantling
Electrolyte infiltration completely, does not occur " analysis lithium " phenomenon.
Experimental example four:
It will be installed at core, and by the pole piece core with one end by the pole piece coiling of the first baking process S20
Semi-finished product battery is made inside the battery case of opening, alternatively, having being installed on by the core of the first baking process S20
Interior of shell open at one end is to be made semi-finished product battery；It is T in temperature1It is injected in=65 ± 5 DEG C of the semi-finished product battery
The semi-finished product battery is moved into vacuum tank after completing fluid injection, and vacuumizes to the inside of the vacuum tank by electrolyte
Until the vacuum degree in the vacuum tank reaches P=-0.075MPa, pressure maintaining duration t=60s；It will complete the fluid injection infiltration step
The semi-finished product battery after rapid is sealed so that finished battery is made；By the finished battery in temperature T2=35 DEG C of item
First stand upside down 18h under part, then upright 18h.Then, it is fully charged to take out battery, the Infiltrating of electrolyte liquid, discovery are observed in dismantling
Not exclusively, there is " analysis lithium " phenomenon in electrolyte infiltration.
Experimental example five:
It will be installed at core, and by the pole piece core with one end by the pole piece coiling of the first baking process S20
Semi-finished product battery is made inside the battery case of opening, alternatively, having being installed on by the core of the first baking process S20
Interior of shell open at one end is to be made semi-finished product battery；It is T in temperature1It is injected in=35 ± 5 DEG C of the semi-finished product battery
The semi-finished product battery is moved into vacuum tank after completing fluid injection, and vacuumizes to the inside of the vacuum tank by electrolyte
Until the vacuum degree in the vacuum tank reaches P=-0.065MPa, pressure maintaining duration t=40s；It will complete the fluid injection infiltration step
The semi-finished product battery after rapid is sealed so that finished battery is made；By the finished battery in temperature T2=20 DEG C of item
It first stands upside down for 24 hours under part, then upright 12h.Then, it is fully charged to take out battery, the Infiltrating of electrolyte liquid, discovery are observed in dismantling
Not exclusively, there is " analysis lithium " phenomenon in electrolyte infiltration.
Known to Comprehensive Experiment example one to the experimental result of experimental example five: by improving the temperature of semi-finished product battery, increasing and infuse
Vacuum pressure and extension dwell time after liquid, effectively improve the effect of impregnation of electrolyte, prevent occurring analysis lithium on pole piece
The phenomenon that, improve the yields of product；By improving environment temperature locating for battery, optimize the placement pattern of invasion of battery
(first standing upside down, rear upright) and extend infiltrating time, effectively improves the effect of impregnation of electrolyte, prevent occurring analysis lithium on pole piece
Phenomenon improves the yields of product.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (10)
1. a kind of lithium battery manufacturing process characterized by comprising
Preparation section prepares pole piece or core；
The pole piece or the core are put into oven and are toasted by the first roasting procedure；
Assembling procedure will be installed on tool at core, and by the core by the pole piece coiling of first roasting procedure
Have semi-finished product battery is made inside battery case open at one end, alternatively, by pacifying by the core of the first roasting procedure
Loaded on inside battery case open at one end semi-finished product battery is made；
The semi-finished product battery for completing the assembling procedure is put into oven and is toasted by the second roasting procedure；
Fluid injection infiltrates process, is T in temperature after completing second roasting procedure1The semi-finished product battery in inject electrolysis
Liquid, the amount of the electrolyte of injection are M, the semi-finished product battery are moved into vacuum tank after completing fluid injection, and to the vacuum tank
Inside vacuumize until the vacuum tank in vacuum degree reach P, dwell time t, wherein T1=65 DEG C ± 5 DEG C,
P=(- 0.070) MPa~(- 0.060) MPa, t=70s~90s, M=9.30 ± 0.2g；
Sealing process seals so that finished battery is made the semi-finished product battery for completing the fluid injection infiltration process；
Infiltration process is shelved, the finished battery for completing the sealing process is first stood upside down and shelves infiltration, then uprightly shelves leaching
Profit；
The finished battery that infiltration process is shelved described in completion is carried out charge and discharge by formation process.
2. lithium battery manufacturing process according to claim 1, which is characterized in that first roasting procedure includes:
First substep, the pole piece or the core are put into oven, are vacuumized to oven inside until inside oven
Vacuum degree isSetting baking temperature toasts the core for 95 ± 5 DEG C, and baking duration 10 ±
1min；
Second substep is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature 95
± 5 DEG C are toasted the pole piece or the core, and to continuing air blast inside the oven, and baking duration 10 ±
1min；
Third substep, keeps the vacuum degree of ovenBaking temperature is reduced to 90 ± 5 DEG C to the pole piece
Or the core is toasted, and to air blast is continued inside the oven, toasts 60 ± 1min of duration
4th substep vacuumizes oven inside until the vacuum degree inside oven isSetting baking temperature
90 ± 5 DEG C of degree toasts the pole piece or the core, toasts 5 ± 1min of duration；
5th substep is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature 90
± 5 DEG C are toasted the pole piece or the core, and to continuing air blast inside the oven, and baking duration 30 ±
1min；
The 4th substep and the 5th substep are circuited sequentially, when circulation is 17 ± 7 weeks a length of；
And/or second roasting procedure includes:
First sub-step puts the semi-finished product battery in oven into, and the vacuum degree until inside oven is vacuumized to oven inside
ForSetting baking temperature toasts the semi-finished product battery for 95 ± 5 DEG C, and baking duration 10 ±
1min；
Second sub-step is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature 95
± 5 DEG C are toasted the semi-finished product battery, and to air blast is continued inside the oven, toast 10 ± 1min of duration；
Third sub-step keeps the vacuum degree of ovenAnd to air blast is continued inside the oven, by baking temperature
Degree is reduced to 90 ± 5 DEG C and toasts to the semi-finished product battery, toasts 60 ± 1min of duration；
4th sub-step vacuumizes oven inside until the vacuum degree inside oven isSetting baking temperature
90 ± 5 DEG C of degree toasts the semi-finished product battery, toasts 5 ± 1min of duration；
5th sub-step is charged into nitrogen into oven until vacuum degree is in ovenKeep baking temperature 90
± 5 DEG C are toasted the semi-finished product battery, and to air blast is continued inside the oven, toast 30 ± 1min of duration；
Circuit sequentially the 4th sub-step and the 5th sub-step, when circulation is 60 ± 5 weeks a length of.
3. lithium battery manufacturing process according to claim 1, which is characterized in that it is described shelve infiltration process include will be described
Finished battery is T in temperature2Under conditions of first stand upside down 18-24h, then upright 12-24h, T2=35 ± 10 DEG C.
4. lithium battery manufacturing process according to claim 1, which is characterized in that the vacuum tank is set in glove box,
Temperature inside the glove box is 21 ± 6 DEG C, and humidity is less than or equal to 2.0%RH.
5. lithium battery manufacturing process according to claim 1, which is characterized in that the assembling procedure is 20 ± 5 in temperature
DEG C, humidity carries out under conditions of being less than or equal to 25%RH；And/or
First roasting procedure terminates to the interval time for entering second roasting procedure to be less than or equal to 4 hours；And/
Or,
The height of the finished battery is 102 ± 4mm.
6. lithium battery manufacturing process according to claim 1, which is characterized in that the preparation section specifically includes:
Cutting action is cut into the positive plate that width is 94.5 ± 5mm and the negative electrode tab that width is 96.0 ± 5mm, the anode
Piece includes cathode metal substrate and coated in the positive coating outside the cathode metal substrate；
Anode ear is welded on the positive plate by film-making process, will by the first negative pole lug welding in one end of the negative electrode tab
The other end of second negative pole lug welding in negative electrode tab；
Rolling step, by the positive plate for being welded with anode ear, be welded with the first negative electrode lug and the second negative electrode lug negative electrode tab and
Diaphragm by outside to inside according to " the first diaphragm/negative electrode tab/the second diaphragm/positive plate " laminated structure and be wound into core.
7. lithium battery manufacturing process according to claim 6, which is characterized in that the compacted density of the positive plate be less than or
Equal to 4.3g/cm3, negative electrode tab compacted density be less than or equal to 1.8g/cm3；And/or
The anode ear is welded at the 1/2-2/3 of the positive plate length direction.
8. lithium battery manufacturing process according to claim 6, which is characterized in that the rolling step includes first to described the
After one diaphragm and second diaphragm carry out pre-roll 1.0-2.0 circle, it is put into the negative electrode tab, to the negative electrode tab pre-roll 1.5-
2.7 circle after, be put into the positive plate, to the positive plate pre-roll 1.0-2.0 circle after, be integrally wound into it is cylindric and fix with
Form the core.
9. lithium battery manufacturing process according to claim 6, which is characterized in that the anode coating includes LiFePO4 material
Material, the formation process include:
First substep is charged to the finished battery with constant current 0.2C, and during the charging process, charging upper limit voltage is arranged
For 3650mV, entire charging duration 120min；
Second substep is charged to the finished battery after completing first substep with constant current 0.3C, and charged
Cheng Zhong, setting charging upper limit voltage is 3650mV, after charging voltage rises to setting value, keeps charging voltage constant, then
Control charging current gradually decreases down 0.01C, stops charging, limits charging duration 230min；
Third substep will complete the finished battery after second substep and stand 5min；
4th substep is charged to the finished battery after completing the third substep with constant current 0.5C, and charged
Cheng Zhong, setting charging upper limit voltage is 3650mV, after charging voltage rises to setting value, keeps charging voltage constant, then
Control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep will complete the finished battery of the 5th substep type discharge under conditions of constant current is 0.5C
Electricity, and during discharge, setting electric discharge lower voltage limit is 2000mV, limitation electric discharge duration 150min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and charged
Control charging voltage in journey and gradually rise up to 3300mV, then keep charging voltage 3300mV constant, then control charging current by
0.01C is gradually dropped to, charging terminates, and entire charging process duration is limited to 200min；
Wherein, C is the rated capacity of the lithium battery.
10. lithium battery manufacturing process according to claim 6, which is characterized in that the anode coating includes ternary material,
The formation process includes:
First substep is charged to the finished battery with constant current 0.2C, and during the charging process, the charging voltage upper limit is arranged
For 4200-4400mV, entire charging duration 120min；
Second substep is charged with constant current 0.3C to the finished battery for completing first substep, and in charging process
In, the setting charging voltage upper limit is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage constant, so
Control charging current gradually decreases down 0.01C afterwards, stops charging, entire charging duration 300min；
Third substep will complete the finished battery after second substep and stand 5min；
4th substep is charged with constant current 0.5C to the finished battery for completing the third substep, and in charging process
In, the setting charging voltage upper limit is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage constant, so
Control charging current gradually decreases down 0.01C afterwards, stops charging, entire charging duration 200min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep will complete the finished battery of the 5th substep type discharge under conditions of constant current is 0.5C
Electricity, and during discharge, setting electric discharge lower voltage limit is 2500-3000mV, limitation electric discharge duration 150min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and charged
Cheng Zhong, setting charging upper limit voltage is 3850mV, after charging voltage rises to setting value, keeps charging voltage constant, then
Control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
Or, the formation process includes:
First substep is charged with constant current 0.02C to the finished battery, and during the charging process, setting charging upper limit electricity
Pressure is 3850mV, entire charging duration 60min；
Second substep is charged to the finished battery after completing first substep with constant current 0.1C, and charged
Cheng Zhong, setting charging upper limit voltage are 3850mV, entire charging duration 120min；
Third substep is charged to the finished battery after completing second substep with constant current 0.2C, and charged
Cheng Zhong, setting charging upper limit voltage are 3850mV, entire charging duration 240min；
4th substep is charged with constant current 0.3C to the finished battery for completing the third substep, and in charging process
In, setting charging upper limit voltage is 4200-4400mV, after charging voltage rises to setting value, keeps charging voltage constant, so
Control charging current gradually decreases down 0.01C afterwards, stops charging, entire charging duration 300min；
5th substep will complete the finished battery after the 4th substep and stand 5min；
6th substep will complete the finished battery of the 5th substep type discharge under conditions of constant current is 0.5C
Electricity, and during discharge, setting electric discharge lower voltage limit is 2500-3000mV, limitation electric discharge duration 200min；
7th substep will complete the finished battery after the 6th substep and stand 5min；
8th substep is charged to the finished battery after completing the 7th substep with constant current 0.5C, and charged
Cheng Zhong, setting charging upper limit voltage is 3850mV, after charging voltage rises to setting value, keeps charging voltage constant, then
Control charging current gradually decreases down 0.01C, stops charging, entire charging duration 200min；
Wherein, C is the rated capacity of the lithium battery.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110391463A (en) * | 2019-06-26 | 2019-10-29 | 上海米开罗那机电技术有限公司 | Improve the production line and its processing technology of lithium battery interior water content |
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Application publication date: 20190607 |