CN104347896A - Method for improving service life of lithium ion battery in low temperature environment - Google Patents
Method for improving service life of lithium ion battery in low temperature environment Download PDFInfo
- Publication number
- CN104347896A CN104347896A CN201310340827.2A CN201310340827A CN104347896A CN 104347896 A CN104347896 A CN 104347896A CN 201310340827 A CN201310340827 A CN 201310340827A CN 104347896 A CN104347896 A CN 104347896A
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- battery
- pulse
- temperature
- lithium ion
- ion battery
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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
-
- 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
-
- 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
- H01M10/443—Methods for charging or discharging in response to temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a method for improving service life of a lithium ion battery in a low temperature environment, and belongs to the battery technical field. According to the method, before use in the low temperature environment, firstly the battery is applied with pulse to increase the self temperature of the battery. That is to say, before use in the low temperature environment, firstly the battery is applied with a certain amount of pulse electricity, so as to make the battery evenly reach a suitable temperature. While the battery design cost is not increased, the service life of the battery in the low temperature environment is improved. The method can increase the temperature of the battery in a relatively short period of time, the battery self temperature rising uniformity is good, and thus the temperature of the battery using environment is reduced, and the service life of the battery in the low temperature environment is improved.
Description
Technical field
The invention belongs to cell art, particularly a kind of method in improve lithium ion battery useful life at low ambient temperatures.
Background technology
Along with the day by day exhausted of traditional energy and its pollution caused are day by day serious, national governments are more and more stronger to the expectation of new-energy automobile, expect that its appearance can alleviate the current increasingly serious energy, ambient pressure that we face.The thus referred important position of key technology-battery technology as new-energy automobile development.Be widely used due to the advantage of lithium-ion-power cell in energy density, power-performance etc.
The continuous expansion of lithium ion battery operation strategies, uses the requirement of condition also further harsh for it.The thing followed is that lithium battery industry must solve, and the stability of battery under how promoting lithium battery useful life at low temperatures and improving low temperature, this is the opportunities and challenges that the industry faces.
In order to solve the problem, lithium electrician author is at change battery active material, and collector thickness, and optimize the aspect such as bath composition and done a large amount of work, makes the high temperature performance of battery be very significantly improved.But also cause the raising of battery cost simultaneously, and make related process more complicated.In addition, on the basis not changing the original formula of lithium battery and structure, by the mode of external heat, battery system is carried out to the method for overall heating and thermal insulation, change the environment for use temperature of battery, also can reach certain effect of optimization.But the mode of external heat, is difficult to the uniformity ensureing often to prop up battery and single internal temperature of battery in battery system, causes stability test to be deteriorated.
Summary of the invention
The object of the invention is to propose on prior art basis a kind ofly to reduce lithium ion battery environment for use temperature, the method in improve lithium ion battery useful life at low ambient temperatures, take the mode of precharge, the method, by before low temperature environment uses, first applies pulse to promote battery own temperature to battery.Namely, before low temperature environment uses, first a certain amount of Pulse Electric is applied to battery, make the temperature that battery self reaches suitable uniformly.While not increasing battery design cost, improve the useful life under battery low temperature environment.
In order to achieve the above object, the present invention adopts following technical scheme:
Low temperature environment use before, first detect battery open circuit voltage (OCV) and temperature (T), then according to open circuit voltage and temperature determine to battery apply inceptive impulse parameter (different system battery parameter is slightly different, and battery parameter refers to V
critical, R, K), when battery temperature raise 1 ~ 2 DEG C, again according to open circuit voltage and temperature adjustment pulse parameter, until battery temperature reaches suitable serviceability temperature.Although the battery low temperature environment confining spectrum of different system is different, general with 0 DEG C for separation, being below low temperature environment, is more than preference temperature.
The pulse applied can be constant current mode pulse or constant pressure type pulse.
The pulse applied is step by-step impulse.
When adopting constant pressure type pulse, the voltage selected be V
critical.
Constant current mode pulse method, the electric current I selected
n=[(V
critical n-OCV
n)/R
n] * K, V
criticalreferring to charge to battery in relevant temperature there is analysing the critical potential of lithium, and OCV is the starting voltage of battery, and R refers to that battery causes the resistance capabilities of polarization when initial state under relevant temperature, and K is current correction coefficient 0.5 ~ 2.0, n is natural number, wherein I
1< I
2< I
3< ... < I
n.
The time of the individual pulse implemented is 1mS ~ 100S, is preferably 1mS ~ 1S.
The pulse implemented can be rechargeable, discharge type and charging/discharging type pulse, preferably when SOC(is determined by OCV) > 70% time, adopt discharge type; When 30%≤SOC≤70%, adopt charging/discharging type; As SOC < 30%, adopt rechargeable.
Said method is suitable for cell and battery system.
Beneficial effect of the present invention is:
After battery own temperature is brought up to suitable serviceability temperature by step by-step impulse charging/discharging thereof by the present invention, carry out normal discharge and recharge again, this kind of method carries out the selection of pulse current, and along with increasing progressively of battery temperature, pulse current is also corresponding to be increased progressively; Because this kind of method pulse fabric width is narrower, in the process of carrying out pulse, deterioration can not be caused to battery self performance; This kind of method can promote battery temperature within a short period of time, and battery self temperature rise uniformity is good, thus reduces the temperature of battery environment for use, improves battery useful life at low ambient temperatures.
Accompanying drawing explanation
Fig. 1: during the pulse of constant current charge-discharge formula, pulse current, cell voltage and time variations simulation curve (I
1pulse current, t
1one pulse time);
Fig. 2: during the pulse of constant current charge-discharge formula, stepping electric current and time variations simulation curve;
Fig. 3: constant current charge formula pulse current and time variations simulation curve;
Fig. 4: constant-current discharge formula pulse current and time variations simulation curve;
Fig. 5: battery surface temperature rise is change modeling curve in time;
Fig. 6: during the pulse of constant voltage charge formula, pulse current, cell voltage and time variations simulation curve;
Fig. 7: battery impedance collection of illustrative plates before and after pulse in embodiment 1.
Embodiment
The following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
It is substantially identical that the lithium battery technique that the present invention mentions and instrument and traditional handicraft use, before battery low temperature uses, just take pulsed precharge from the method for heating, make the serviceability temperature that battery reaches suitable, and then improve battery useful life at low ambient temperatures.
First the manufacture craft of lithium ion battery is carried out:
1. the coating of positive pole: positive electrode, carbon black, KS-15, polyvinylidene fluoride (PVDF) are mixed according to a certain percentage, stir, then carries out positive pole coating;
2. the coating of negative pole: graphite, carbon black, LA-132, carboxymethyl cellulose (CMC) are mixed according to a certain percentage, stir, then carries out negative pole coating;
3. will 1., 2. gained positive/negative plate through overbaking, roll-in, cut-parts, combo, lamination, packaging technology, prepare battery;
4. liquid injection process, injects the electrolyte of 1.0mol/LLiPF6 (EC:DEC:DMC=1:1:1) type; 1.0mol/LLiPF6 (EC:DEC:DMC=1:1:1) refers to that LiPF6 is dissolved in the mixed solution of ethylene carbonate (EC), diethyl carbonate (DEC) and the dimethyl carbonate (DMC) that volume ratio is 1:1:1 and forms the electrolyte that concentration is 1mol/L;
5. carry out preliminary filling chemical synthesis technology and obtain resultant battery.
Main embodiment is as following scheme:
Embodiment
Embodiment 1: constant current mode discharge and recharge
Making capacity is according to the method described above the battery of 20Ah, and adopt the mode of stepping constant current charge-discharge pulse, carry out self preheating test to battery, totally 8 pace pulse flow processs from-15 DEG C, single step pulse time 0.6S, temperature interval is 2 DEG C, V
criticalbe identified as 4.2V, OCV is 3.7V, K is 1.0, R
nknown, by I
n=[(V
face boundary n-OCV
n)/R
n] * K calculates I
n, carrying out I
1during pulse, detect battery temperature, when temperature reaches-13 DEG C, transfer I to
2pulse, carries out step by-step impulse until battery temperature is greater than 0 DEG C according to following table electric current.
Parameter sees the following form:
By in upper table, t
1calculate with pulse number: in 36min, battery temperature is evenly warming up to more than 0 DEG C by-15 DEG C.For whether checking pulse brings injury to battery, after repeating above-mentioned test 30 times, test battery impedance spectrum when OCV is 3.7V at 25 DEG C.As seen from Figure 7, apply pulse current in a short time to heating of battery, battery impedance has growth slightly, but changes not obvious, not can think and damage battery.
Embodiment 2: constant current mode is charged
Making capacity is according to the method described above the battery of 25Ah, and adopt the mode of stepping constant current charge pulse, carry out self preheating test to battery, totally 5 pace pulse flow processs from-10 DEG C, single step pulse time 0.05S, temperature interval is 2 DEG C, V
criticalbe identified as 4.2V, OCV
nfor 3.5V, K are 1.0, R
nknown, by I
n=[(V
critical n-OCV
n)/R
n] * K calculates I
n, carrying out I
1during pulse, detect battery temperature, when temperature reaches-8 DEG C, transfer I to
2pulse, carries out step by-step impulse until battery temperature is greater than 0 DEG C according to following table electric current.
Parameter sees the following form:
By in upper table, t
1calculate with pulse number: in 13min, battery temperature is evenly warming up to more than 0 DEG C by-10 DEG C, battery SOC increases by 19.5%.
Embodiment 3: constant pressure type charges
Making capacity is according to the method described above the battery of 30Ah, and adopt the mode of stepping constant voltage charge pulse, carry out self preheating test to battery, totally 5 pace pulse flow processs from-10 DEG C, single step pulse time 0.1S, temperature interval is 2 DEG C, V
critical 1be identified as 4.25V, OCV
1for 3.5V, carry out V
critical 1during pulse, detect battery temperature, when temperature reaches-8 DEG C, transfer V to
critical 2pulse, carries out step by-step impulse until battery temperature is greater than 0 DEG C according to following table electric current.
Parameter sees the following form:
By in upper table, t
1calculate with pulse number: in 11min, battery temperature is evenly warming up to more than 0 DEG C by-10 DEG C, battery SOC increases by 15%.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the method in improve lithium ion battery useful life at low ambient temperatures, is characterized in that: the method, by before low temperature environment uses, first applies pulse to promote battery own temperature to battery.
2. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, is characterized in that: before low temperature environment uses, first apply a certain amount of Pulse Electric to battery, make the temperature that battery self reaches suitable uniformly.
3. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, it is characterized in that: before low temperature environment uses, first battery open circuit voltage (OCV) and temperature (T) is detected, then the inceptive impulse parameter that battery is applied is determined according to open circuit voltage and temperature, when battery temperature raises 1 ~ 2 DEG C, again according to open circuit voltage and temperature adjustment pulse parameter, until battery temperature reaches suitable serviceability temperature.
4. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, is characterized in that: the pulse of applying is constant current mode pulse or constant pressure type pulse.
5. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, is characterized in that: the pulse of applying is step by-step impulse.
6. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, is characterized in that: when adopting constant pressure type pulse, the voltage selected be V
critical.
7. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 4, is characterized in that: constant current mode pulse method, the electric current I selected
n=[(V
critical n-OCV
n)/R
n] * K, V
criticalreferring to charge to battery in relevant temperature there is analysing the critical potential of lithium, and OCV is the starting voltage of battery, and R refers to that battery causes the resistance capabilities of polarization when initial state under relevant temperature, and K is current correction coefficient 0.5 ~ 2.0, n is natural number, wherein I
1< I
2< I
3< ... < I
n.
8. the method in the improvement lithium ion battery according to claim 6 or 7 useful life at low ambient temperatures, is characterized in that: the time of the individual pulse implemented is 1mS ~ 100S, is preferably 1mS ~ 1S.
9. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, it is characterized in that: the pulse implemented can be rechargeable, discharge type and charging/discharging type pulse, be preferably as follows: when SOC(is determined by OCV) > 70% time, adopt discharge type; When 30%≤SOC≤70%, adopt charging/discharging type; As SOC < 30%, adopt rechargeable.
10. the method in improve lithium ion battery useful life at low ambient temperatures according to claim 1, is characterized in that: the method is suitable for cell and battery system.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106655407A (en) * | 2017-01-19 | 2017-05-10 | 宁德新能源科技有限公司 | Battery charging method and device, electronic equipment, adapter and charger |
| CN107064817A (en) * | 2017-04-24 | 2017-08-18 | 哈尔滨理工大学 | A kind of zinc-silver oxide cell charge state detection method |
| CN109904533A (en) * | 2017-12-11 | 2019-06-18 | 奥动新能源汽车科技有限公司 | The battery life analysis system and method for battery for electric automobile packet |
| CN110470992A (en) * | 2019-08-29 | 2019-11-19 | 清华大学 | Durability test method, system and the data table generating method of battery impulse heating |
| CN110890600A (en) * | 2019-09-24 | 2020-03-17 | 北京理工大学 | Charging method for 18650 type lithium ion battery in low-temperature environment |
| CN111211595A (en) * | 2020-01-14 | 2020-05-29 | 北京小米移动软件有限公司 | Charging method and device, electronic equipment and storage medium |
| CN111426954A (en) * | 2020-04-13 | 2020-07-17 | 清华大学 | Logarithmic prediction method and device for service life and residual life of fuel cell |
| CN112670622A (en) * | 2020-12-22 | 2021-04-16 | 山东大学 | Low-temperature lithium ion battery alternating-current preheating method based on constant-current constant-voltage charging and discharging |
| CN113571790A (en) * | 2021-08-17 | 2021-10-29 | 常州高态信息科技有限公司 | Charging method of lithium ion battery |
| WO2022160188A1 (en) * | 2021-01-28 | 2022-08-04 | 宁德时代新能源科技股份有限公司 | Charging method, battery management system of power battery, and charging pile |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106655407A (en) * | 2017-01-19 | 2017-05-10 | 宁德新能源科技有限公司 | Battery charging method and device, electronic equipment, adapter and charger |
| CN107064817A (en) * | 2017-04-24 | 2017-08-18 | 哈尔滨理工大学 | A kind of zinc-silver oxide cell charge state detection method |
| CN107064817B (en) * | 2017-04-24 | 2020-02-14 | 哈尔滨理工大学 | Method for detecting charge state of zinc-silver battery |
| CN109904533A (en) * | 2017-12-11 | 2019-06-18 | 奥动新能源汽车科技有限公司 | The battery life analysis system and method for battery for electric automobile packet |
| CN110470992A (en) * | 2019-08-29 | 2019-11-19 | 清华大学 | Durability test method, system and the data table generating method of battery impulse heating |
| CN110470992B (en) * | 2019-08-29 | 2020-06-19 | 清华大学 | Durability test method and system for pulse heating of battery and data table generation method |
| CN110890600B (en) * | 2019-09-24 | 2021-06-29 | 北京理工大学 | Charging method for 18650 type lithium ion battery in low-temperature environment |
| CN110890600A (en) * | 2019-09-24 | 2020-03-17 | 北京理工大学 | Charging method for 18650 type lithium ion battery in low-temperature environment |
| CN111211595A (en) * | 2020-01-14 | 2020-05-29 | 北京小米移动软件有限公司 | Charging method and device, electronic equipment and storage medium |
| US11398744B2 (en) | 2020-01-14 | 2022-07-26 | Beijing Xiaomi Mobile Software Co., Ltd. | Charging method and device, electronic device and storage medium |
| CN111211595B (en) * | 2020-01-14 | 2021-11-09 | 北京小米移动软件有限公司 | Charging method and device, electronic equipment and storage medium |
| CN111426954A (en) * | 2020-04-13 | 2020-07-17 | 清华大学 | Logarithmic prediction method and device for service life and residual life of fuel cell |
| CN111426954B (en) * | 2020-04-13 | 2021-04-13 | 清华大学 | Logarithmic prediction method and device for service life and residual life of fuel cell |
| CN112670622A (en) * | 2020-12-22 | 2021-04-16 | 山东大学 | Low-temperature lithium ion battery alternating-current preheating method based on constant-current constant-voltage charging and discharging |
| WO2022160188A1 (en) * | 2021-01-28 | 2022-08-04 | 宁德时代新能源科技股份有限公司 | Charging method, battery management system of power battery, and charging pile |
| CN113571790A (en) * | 2021-08-17 | 2021-10-29 | 常州高态信息科技有限公司 | Charging method of lithium ion battery |
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