CN107579301A - A kind of chemical synthesis technology of lithium iron phosphate dynamic battery - Google Patents
A kind of chemical synthesis technology of lithium iron phosphate dynamic battery Download PDFInfo
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- CN107579301A CN107579301A CN201710774669.XA CN201710774669A CN107579301A CN 107579301 A CN107579301 A CN 107579301A CN 201710774669 A CN201710774669 A CN 201710774669A CN 107579301 A CN107579301 A CN 107579301A
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Abstract
The present invention discloses a kind of chemical synthesis technology of lithium iron phosphate dynamic battery, including step：Battery pack is shelved into 1 5min on needle-bar formation cabinet, opens 0.06 ~ 0.09MPa of vacuum；After the completion of shelving, by constant-current charging of battery to high-voltage state, 0.06 ~ 0.09MPa of vacuum is opened, environment temperature is controlled at 35 40 DEG C；5 10min are shelved by battery is secondary, open 0.06 ~ 0.09MPa of vacuum, environment temperature is controlled at 35 40 DEG C；By battery constant-current discharge, 0.06 ~ 0.09MPa of vacuum is opened, environment temperature is controlled at 35 40 DEG C.Chemical synthesis technology used time 5h of the present invention, compared with the 70h of traditional handicraft, substantially reduce the chemical conversion time, formation device quantity reduces more than 6 times, more than 6 times of single battery power savings, the production efficiency of lithium iron phosphate dynamic battery is improved, and lithium battery property retention is good.
Description
Technical field
The present invention relates to technical field of lithium ion, specifically a kind of chemical synthesis technology of lithium iron phosphate dynamic battery.
Background technology
Petroleum resources increasingly depleted, next oil crisis arriving before, greatly develop pure electric automobile be it is only it
Choosing.Lithium ion battery is the green high-capacity environment-protecting battery occurred the 1990s, has that energy density is high, environment-friendly, nothing
Memory effect, have extended cycle life, self discharge is few etc. it is prominent the advantages of, be video camera, mobile phone, notebook computer, portable
The ideal source of the electronic installation miniaturization such as measuring instrument, and following electric automobile, military preferable light high-energy power
Source.Therefore, lithium ion battery turns into the widely studied focus of battery circle in recent years.
Chemical conversion is the important procedure in Production Process of Lithium Battery, and chemical conversion is first the making of battery, makes the active material of battery core
Activation, it is the process of an energy conversion, the chemical conversion of lithium cell is an extremely complex process, while is also to influence electricity
The critically important procedure of pond performance, because in Li+When charging for the first time, Li+It is inserted into for the first time in graphite, can be in battery
Generation electrochemical reaction, during battery initial charge inevitably on the boundary of Carbon anode and electrolyte, shape
Into the passivation thin layer for being covered in carbon electrodes, people are referred to as solid electrolyte interface or SEI films, the quality of SIE films
The performances such as the capacity of battery, cycle life, voltage platform, DC internal resistance are directly affected, SEI films are mainly by certain negative pole
Under current potential, irreversible reaction occurs for solvent molecule in the lithium ion and electrolyte of electrode/electrolyte boundary etc.；From the above
It can be seen that influence SEI film qualities have the factors such as electric current, voltage, electrolyte system, negative pole, lithium salts in general introduction.
Traditional low current preliminary filling mode contributes to stable SEI films to be formed, and large current charge can cause SEI films to be formed
It is not fine and close, cause battery capacity, cycle life, multiplying power to be deteriorated, and process time length influences production efficiency.Lithium ion battery
Particularly ferric phosphate lithium cell chemical conversion (initial charge) process is very big to battery later stage performance impact, because this process is related to
The formation of battery electrode surface solid phase and liquid interface layer.The initial charge of ferric phosphate lithium cell is in charging/discharging apparatus at present
Upper progress multistep constant current, constant-voltage charge, the cycle performance of battery is undesirable, formation process time length, so results in equipment throwing
Enter the problems such as big, the production cycle is long, equipment service efficiency is low, power consumption is big, seriously affect the production efficiency of lithium battery.
The content of the invention
It is an object of the invention to provide a kind of chemical synthesis technology of lithium iron phosphate dynamic battery.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of chemical synthesis technology of lithium iron phosphate dynamic battery, specifically includes following steps：
(1) shelve：Lithium iron phosphate dynamic battery is assembled on needle-bar formation cabinet and shelves 1-5min, opens vacuum -0.06
~-0.09MPa, environment temperature are controlled at 35-40 DEG C, and negative pressure transfers inside battery gas, makes battery core closer；
(2) constant-current charge：After the completion of shelving, by constant-current charging of battery to high-voltage state, open vacuum -0.06~-
0.09MPa, environment temperature are controlled at 35-40 DEG C；The step ensures that SEI films fully react, and reflects all gas, drops
Hypopolarization phenomenon, then taken away by vacuum, ionic conductivity and active material mobility are improved by high temperature.
(3) it is secondary to shelve：After the completion of constant-current charge, battery is shelved into 5-10min, opens vacuum -0.06~-0.09MPa,
Environment temperature is controlled at 35-40 DEG C；
(4) constant-current discharge：It is secondary shelve after the completion of, by battery constant-current discharge, open vacuum -0.06~-0.09MPa, environment
Temperature control is at 35-40 DEG C.
Step (2) constant-current charging of battery to high-voltage state is with 0.3-0.4C constant-current charges to 3.5V.
Step (4) constant-current discharge is to put 80-100min with 0.5-0.8C.
Step (4) the constant-current discharge depth is 40-60%, ensures that battery side reaction in ageing process is reduced, positive and negative
Pole fully absorbs electrolyte, ensures that battery capacity reaches requirement.
Beneficial effects of the present invention：
1st, chemical synthesis technology of the present invention include shelving, constant-current charge, it is secondary shelve and constant-current discharge, constant-current charge ensures SEI
Film is fully reacted, and reflects all gas, reduces polarization phenomena, then is taken away by vacuum, and ion-conductance is improved by high temperature
Conductance and active material mobility；Constant-current discharge makes battery in 40%SOC agings, guarantee battery side reaction in ageing process
Reduce, both positive and negative polarity fully absorbs electrolyte, ensures that battery capacity reaches requirement.
2nd, chemical synthesis technology used time 5h of the present invention, compared with the 70h of traditional handicraft, the chemical conversion time is substantially reduced, chemical conversion is set
Standby quantity reduces more than 6 times, more than 6 times of single battery power savings, improves the production efficiency of lithium iron phosphate dynamic battery,
And lithium battery property retention is good.
Embodiment
The present invention is described in further detail with reference to specific embodiment.
A kind of chemical synthesis technology of lithium iron phosphate dynamic battery, comprises the following steps：
(1) shelve：Lithium iron phosphate dynamic battery is assembled on needle-bar formation cabinet and shelves 1-5min, opens vacuum -0.06
~-0.09MPa, environment temperature are controlled at 35-40 DEG C, and negative pressure transfers inside battery gas, makes battery core closer；
(2) constant-current charge：After the completion of shelving, by constant-current charging of battery to high-voltage state, open vacuum -0.06~-
0.09MPa, environment temperature are controlled at 35-40 DEG C；
(3) it is secondary to shelve：After the completion of constant-current charge, battery is shelved into 5-10min, opens vacuum -0.06~-0.09MPa,
Environment temperature is controlled at 35-40 DEG C；
(4) constant-current discharge：It is secondary shelve after the completion of, by battery constant-current discharge, open vacuum -0.06~-0.09MPa, environment
Temperature control makes battery positive and negative in 40-60%SOC agings, the side reaction reduction in ageing process of guarantee battery at 35-40 DEG C
Pole fully absorbs electrolyte, ensures that battery capacity reaches requirement.
The present invention does following research and improvement around these factors：
1st, different electric currents are melted into the influence to battery performance；
2nd, influence of the different chemical conversion work steps to battery performance；
3rd, influence of the chemical synthesis technology under different vacuums to battery performance；(many gas can be produced during chemical conversion
Body, the aggregation of gas can cause the generation of polarization phenomena, and its aerogenesis total amount is maximum at voltage 3.5V in formation process, and works as
After formation voltage is more than 3.5V, then caused gas is just rapid is reduced.When formation voltage is less than 2.5V, caused gas is main
For H2And CO2Deng；With the rise of formation voltage, in the range of 3.0V~3.8V, the composition of gas is mainly C2H4, exceed
After 3.8V, C2H4Content is remarkably decreased, and this caused gas componant is mainly C2H6And CH4, cause the SEI films not fine and close)
4th, influence of the chemical conversion to battery performance under different temperatures；Temperature influences the viscosity and electrical conductivity of electrolyte, and temperature is too
Height can cause lithium salts and solvolysis, and temperature is too low to cause viscosity bigger than normal and electrical conductivity declines.
Embodiment 1：By taking 76Ah aluminum hull ferric phosphate lithium cells as an example, design capacity 76Ah, actual capacity 76-78Ah are different
The influence of electric current and charging upper limit voltage battery pair performance；Under same test condition, the data comparison of detection is shown in Table 1：
Table 1
0.3C-0.4C charges as can be seen from Table 1, and charging upper limit voltage 3.5V only influences capacity, do not influence other property
Can, 0.5C rechargeable battery performance impacts are larger, and formation of the electric current too greatly to SEI films has fatal harm, prove that battery exists in addition
SOC100% agings cause side reaction more, cause lithium salts loss more.
Embodiment 2：By taking 76Ah aluminum hull ferric phosphate lithium cells as an example, under same test condition, the data comparison of detection is shown in
Table 2：
Influence of the different chemical conversion work steps to battery performance；
Table 2
From Table 2, it can be seen that charging 3.5V, electric discharge 40%-60% storages, electrical property charge significantly better than only, still
Discharge current is excessive also to have a significant impact to battery performance, and 0.5-0.8C discharge battery performances are best.
Embodiment 3：By taking 76Ah aluminum hull ferric phosphate lithium cells as an example, different vacuum, under same test condition, inspection
The data comparison of survey is shown in Table 3：
Table 3
From table 3 it is observed that the height of vacuum influences the capacity and cycle life of battery, -0.06~-0.09MPa
Vacuum is optimum value.
Embodiment 4：By taking 76Ah aluminum hull ferric phosphate lithium cells as an example, different temperature, under same test condition, detection
Data comparison be shown in Table 4：
Table 4
As can be seen from Table 4, chemical conversion of the temperature to battery has a significant impact, and is melted at 35-40 DEG C, electrical property is best.
Comparative example 5：Ferric phosphate lithium cell is tested by following condition, the results are shown in Table 5.
Table 5
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously can easily make various modifications to case study on implementation, and described herein one
As principle be applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to implementation case here
Example, for those skilled in the art according to the announcement of the present invention, not departing from improvement that scope made and modification all should be
Within protection scope of the present invention.
Claims (4)
1. a kind of chemical synthesis technology of lithium iron phosphate dynamic battery, it is characterised in that specifically include following steps：
（1）Shelve：Lithium iron phosphate dynamic battery is assembled on needle-bar formation cabinet and shelves 1-5min, open vacuum -0.06 ~ -
0.09MPa, environment temperature are controlled at 35-40 DEG C, and negative pressure transfers inside battery gas, makes battery core closer；
（2）Constant-current charge：After the completion of shelving, by constant-current charging of battery to high-voltage state, vacuum -0.06 ~ -0.09MPa, ring are opened
Border temperature control is at 35-40 DEG C；
（3）It is secondary to shelve：After the completion of constant-current charge, battery is shelved into 5-10min, opens vacuum -0.06 ~ -0.09MPa, environment temperature
Degree control is at 35-40 DEG C；
（4）Constant-current discharge：It is secondary shelve after the completion of, by battery constant-current discharge, open vacuum -0.06 ~ -0.09MPa, environment temperature control
System is at 35-40 DEG C.
2. the chemical synthesis technology of lithium iron phosphate dynamic battery according to claim 1, it is characterised in that the step（2）Electricity
Pond constant-current charge to high-voltage state is with 0.3-0.4C constant-current charges to 3.5V.
3. the chemical synthesis technology of lithium iron phosphate dynamic battery according to claim 1, it is characterised in that the step（4）It is permanent
It is to put 80-100min with 0.5-0.8C to banish electricity.
4. the chemical synthesis technology of lithium iron phosphate dynamic battery according to claim 1, it is characterised in that the step（4）It is permanent
Stream depth of discharge is 40-60%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109921119A (en) * | 2019-03-08 | 2019-06-21 | 安徽泰能新能源科技有限公司 | A kind of cylindrical lithium ion battery method for pre-charging, production method and its obtained product |
| CN112599874A (en) * | 2020-12-09 | 2021-04-02 | 中国科学院上海硅酸盐研究所 | Electrochemical pretreatment method for improving performance of quasi-solid lithium ion battery |
| CN112751098A (en) * | 2021-01-25 | 2021-05-04 | 唐山航天万源科技有限公司 | Formation method of lithium iron phosphate battery |
| CN116995318A (en) * | 2023-09-25 | 2023-11-03 | 成都特隆美储能技术有限公司 | 3.2V formation process of lithium iron phosphate battery |
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| CN104037456A (en) * | 2014-06-16 | 2014-09-10 | 张晶晶 | Rapid forming process of iron phosphate lithium battery |
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| CN112599874A (en) * | 2020-12-09 | 2021-04-02 | 中国科学院上海硅酸盐研究所 | Electrochemical pretreatment method for improving performance of quasi-solid lithium ion battery |
| CN112599874B (en) * | 2020-12-09 | 2022-06-14 | 中国科学院上海硅酸盐研究所 | Electrochemical pretreatment method for improving performance of quasi-solid lithium ion battery |
| CN112751098A (en) * | 2021-01-25 | 2021-05-04 | 唐山航天万源科技有限公司 | Formation method of lithium iron phosphate battery |
| CN116995318A (en) * | 2023-09-25 | 2023-11-03 | 成都特隆美储能技术有限公司 | 3.2V formation process of lithium iron phosphate battery |
| CN116995318B (en) * | 2023-09-25 | 2023-12-01 | 成都特隆美储能技术有限公司 | 3.2V formation process of lithium iron phosphate battery |
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