CN110098439B - Method for estimating charging time of power battery - Google Patents
Method for estimating charging time of power battery Download PDFInfo
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- CN110098439B CN110098439B CN201910280699.4A CN201910280699A CN110098439B CN 110098439 B CN110098439 B CN 110098439B CN 201910280699 A CN201910280699 A CN 201910280699A CN 110098439 B CN110098439 B CN 110098439B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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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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Abstract
The invention relates to a method for estimating the charging time of a power battery, which comprises the steps of dividing the charging process of the battery into a plurality of charging stages, obtaining charging information of different charging stages, obtaining voltage-charge state curves of the battery at different temperatures, obtaining initial state information when the battery starts to be charged, obtaining the temperature rise of each charging stage of the battery, obtaining the charging amount of each charging stage of the battery, calculating the charging time of each stage and obtaining the total charging time. The invention has the advantages that: the influence of the temperature on the battery voltage-charge state curve is fully considered, the battery voltage-charge state curve of the battery at different temperatures is used for obtaining the battery charge state, the actual charging time of each stage is calculated, the influence of the temperature on the estimation result is eliminated, and the estimation accuracy is improved.
Description
Technical Field
The invention relates to the field of battery charging, in particular to a method for estimating charging time of a power battery.
Background
Accurate estimation of the charging time of the power battery is the most basic performance index of the power battery and is one of the current vehicle purchasing demands of consumers. Meanwhile, the accurate charging time estimation can save the charging time, and the charging efficiency and the load of a charging network can be improved to the maximum extent. However, due to the internal electrochemical factors of the power battery and the dynamic and thermodynamic factors of the power battery, the charging curve of the power battery is influenced and restricted by the SOC, the temperature, the OCV curve, the SOH, the battery consistency, and the current and the voltage, so that the current charging time estimation is not very accurate and has a relatively high deviation.
The existing charging time estimation method mainly divides a charging curve Vt-SOC into a plurality of rectangles, divides the charging capacity in each preset rectangle by the charging current in the corresponding rectangle to obtain the charging time in each preset charging rectangle, and then accumulates the charging time. The main disadvantage of this solution is that when the battery is charged with a large current, the heat generation of the battery is large, which results in a significant increase in the temperature of the battery, and the charging curve Vt-SOC of the battery is significantly shifted at different temperatures, i.e. at different temperatures, the battery true states SOCt corresponding to the same charging current It and the same voltage point Vt are different, and similarly, under different temperature conditions, the voltage points Vt under the same current and the same SOCt state have large deviations, which are mainly caused by temperature changes.
Disclosure of Invention
The method mainly solves the problem that the charging state of the power battery cannot be accurately estimated at different temperatures during charging, and provides the method which can adapt to the actual scene and situation of the power battery charging and improve estimation of the charging time of the power battery with estimated time precision.
The technical scheme adopted by the invention for solving the technical problem is that the method for estimating the charging time of the power battery comprises the following steps:
s1: dividing a battery charging process into a plurality of charging stages;
s2: acquiring charging information of different charging stages;
s3: acquiring voltage-charge state curves of the battery at different temperatures;
s4: acquiring initial state information when a battery starts to charge;
s5: acquiring the temperature rise of each charging stage of the battery;
s6: acquiring the charge quantity of each charging stage of the battery;
s7: and calculating the charging time of each stage to obtain the total charging time.
Generally, battery charging adopts step charging, after charging current, battery voltage and charging time measured in advance in each stage are determined, the temperature of the battery after each stage is finished is obtained according to a battery thermal model formula, the charge state of the battery under the voltage is determined according to a voltage-charge state curve of the temperature, the charging time in the stage is determined according to the electric quantity and the charging current of the battery, and the sum of the charging time in each stage is the whole charging time.
As a preferable mode of the above, the charging information in step S2 includes a charging current, a battery voltage at the end of the charging phase, and a charging time of the phase. The charging current and the battery voltage at the end of the charging phase are both preset, and the charging time in this phase is obtained by averaging several practices.
As a preferable scheme of the above scheme, in step S3, the voltage-charge state curves of different environmental temperatures are obtained by performing step charging on the off-line test sample at different environmental temperatures and detecting the charge state and voltage of the test sample in real time.
As a preferable mode of the above, the test sample is a battery cell. The heat dissipation coefficient of the battery cell is approximately 0, and the influence of self-heating of battery charging on the acquisition curve is avoided when the voltage-charge state curve of the battery at different temperatures is acquired.
As a preferable mode of the above, the initial state information in step S4 includes an initial state of charge SOC0Initial temperature T0And an initial voltage V0。
As a preferable solution of the above solution, in step S5, the temperature rise is obtained through a battery thermal model formula, where the battery thermal model formula is as follows:
delta T is the temperature rise of the battery, i is the current charging current, r is the impedance of the battery, c is the specific heat capacity of the battery, M is the mass of the battery, eta is the heat dissipation coefficient of the battery pack, and dt is the charging time. And acquiring the temperature rise value of the battery in the charging process by using the preset charging current and the charging time obtained by averaging.
As a preferable mode of the above, the step S6 includes the steps of:
s61: the battery initial temperature obtained according to step S4;
s62: according to the temperature rise of each charging stage obtained in the step S6;
s63: calculating the battery temperature at the end of each stage of each step charging;
s64: searching a voltage-charge state curve corresponding to each battery temperature, and determining the battery charge state at the end of each stage of the step charging;
s65: and calculating the charging quantity of each stage of the step charging.
As a preferable mode of the above, the charging time of each stage of the step charging is calculated by the following formula:
Δtnis the charging time of the nth stage, SOCnIs the amount of electricity at the end of the nth phase, SOCn-1Is the amount of electricity at the end of the n-1 th stage, InFor charging at the n stageElectric current, CapThe ampere-hour capacity of the battery.
The invention has the advantages that: the influence of the temperature on the battery voltage-charge state curve is fully considered, the battery voltage-charge state curve of the battery at different temperatures is used for obtaining the battery charge state, the actual charging time of each stage is calculated, the influence of the temperature on the estimation result is eliminated, and the estimation accuracy is improved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a schematic flow chart of the present invention for obtaining the charge amount of each stage.
Detailed Description
The technical solution of the present invention is further described below by way of examples with reference to the accompanying drawings.
Example (b):
a method for estimating charging time of a power battery in this embodiment, as shown in fig. 1, includes the following steps:
s1: dividing a battery charging process into a plurality of charging stages;
s2: acquiring charging information of different charging stages; setting the charging current of the first stage, the second stage, the third stage to the nth stage as I1、I2、I3To InThe voltage of the battery in the first stage, the second stage, the third stage to the nth stage is V1、V2、V3To VnWherein n is more than or equal to 2; v1、V2To VnIncrease in sequence, VnThe highest charging voltage allowed for the battery; i is1、I2To InDecrease in sequence, InIs the maximum allowable current capable of fully charging the battery, using current I1Charging the battery voltage to 0 to V1And recording the required time, repeating the operation for multiple times, averaging to obtain the charging time of the stage, and similarly, obtaining the charging time of each charging stage.
S3: the method comprises the steps of charging offline battery cells in a stepped manner at different environmental temperatures and detecting the charge states and voltages of the battery cells in real time to obtain voltage-charge state curves at different environmental temperatures;
s4: acquiring initial state information including initial state of charge SOC when battery starts to charge0Initial temperature T0And an initial voltage V0；
S5: and acquiring the temperature rise of each stage through a battery thermal model formula, wherein the battery thermal model formula is as follows:
delta T is the temperature rise of the battery, i is the current charging current, r is the impedance of the battery, c is the specific heat capacity of the battery, M is the mass of the battery, eta is the heat dissipation coefficient of the battery pack, and dt is the charging time obtained by charging the battery for multiple times in the step 2;
s6: as shown in fig. 2, the battery initial temperature T is obtained0And acquiring the temperature rise of each stage obtained by calculation to acquire the battery temperature at the end of each stage, determining the battery temperature at the end of each stage, wherein the battery temperature at the end of each stage is equal to the initial temperature of the battery plus the sum of all the temperature rises of the stages between the stages, and the temperature of the battery at the end of each stage is recorded as T1、T2……T3Looking up the battery temperature at T1、T2……T3The corresponding voltage-charge state curves are respectively marked as Vt-SOC1、Vt-SOC2……Vt-SOCnAt Vt-SOC1To obtain a battery voltage of V1State of charge SOC1At Vt-SOC2To obtain a battery voltage of V2State of charge SOC2And by analogy, acquiring the battery charge state of each stage;
s7: by the formula:
calculating the actual charging time of each stage, the time of each stageThe sum of the inter-charging times is the total charging time of the battery, where Δ tnIs the charging time of the nth stage, SOCnIs the amount of electricity at the end of the nth phase, SOCn-1Is the amount of electricity at the end of the n-1 th stage, InIs a charging current of the n-th stage, CapThe ampere-hour capacity of the battery.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. A power battery charging time estimation method is characterized in that: the method comprises the following steps:
s1: dividing a battery charging process into a plurality of charging stages;
s2: acquiring charging information of different charging stages;
s3: acquiring voltage-charge state curves of the battery at different temperatures;
s4: acquiring initial state information when a battery starts to charge;
s5: acquiring the temperature rise of each charging stage of the battery;
s6: acquiring the charge quantity of each charging stage of the battery;
s7: calculating the charging time of each stage to obtain the total charging time;
in the step S5, the temperature rise is obtained through a battery thermal model formula, which is as follows:
delta T is the temperature rise of the battery, i is the current charging current, r is the impedance of the battery, c is the specific heat capacity of the battery, M is the mass of the battery, eta is the heat dissipation coefficient of the battery pack, and dt is the charging time;
the step S6 includes the steps of:
s61: the battery initial temperature obtained according to step S4;
s62: according to the temperature rise of each charging stage obtained in the step S5;
s63: calculating the battery temperature at the end of each charging phase;
s64: searching a voltage-charge state curve corresponding to each battery temperature, and determining the charge state of the battery at the end of each charging stage;
s65: the charge amount of each charging stage is calculated.
2. The method for estimating the charging time of the power battery as claimed in claim 1, wherein: the charging information in said step S2 includes the charging current, the battery voltage at the end of the charging phase and the charging time of the phase.
3. The method for estimating the charging time of the power battery as claimed in claim 1, wherein: the step S3 obtains voltage-charge state curves at different environmental temperatures by performing step charging on the offline test sample at different environmental temperatures and detecting the charge state and voltage of the test sample in real time.
4. The method for estimating the charging time of the power battery as claimed in claim 3, wherein: the test sample is a battery cell.
5. The method for estimating the charging time of the power battery as claimed in claim 1, wherein: the initial state information in step S4 includes an initial state of charge SOC0Initial temperature T0And an initial voltage V0。
6. A method for estimating the charging time of a power battery according to claim 1, 2, 3, 4 or 5, characterized by: the charging time of each charging stage is calculated by the following formula:
Δtnis the charging time of the nth stage, SOCnIs the amount of electricity at the end of the nth phase, SOCn-1Is the amount of electricity at the end of the n-1 th stage, InIs a charging current of the n-th stage, CapThe ampere-hour capacity of the battery.
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| CN110909443A (en) * | 2019-10-12 | 2020-03-24 | 北京航空航天大学 | High-precision battery pack charging remaining time estimation method and system |
| CN111239611B (en) * | 2019-10-21 | 2021-12-10 | 浙江零跑科技股份有限公司 | Calculation method for calibrating PACKSOC based on single battery capacity |
| CN112213641A (en) * | 2019-10-30 | 2021-01-12 | 蜂巢能源科技有限公司 | Battery management system and method for obtaining remaining time |
| CN112216886B (en) * | 2019-10-30 | 2022-05-20 | 蜂巢能源科技有限公司 | Method and device for estimating battery charging time |
| CN111175654B (en) * | 2020-01-13 | 2022-05-13 | 广州小鹏汽车科技有限公司 | Power battery charging remaining time calculation method and device, vehicle and storage medium |
| CN113705002A (en) * | 2021-08-27 | 2021-11-26 | 巨伍汽车科技(昆山)有限公司 | Method for estimating heating time of battery pack |
| CN113968160B (en) * | 2021-09-29 | 2023-10-20 | 华人运通(江苏)技术有限公司 | Vehicle charging time estimation method, device, equipment and storage medium |
| CN113884891A (en) * | 2021-11-03 | 2022-01-04 | 广西电网有限责任公司北海供电局 | Storage battery fault control system |
| CN116359764A (en) * | 2022-12-07 | 2023-06-30 | 湖北亿纬动力有限公司 | Method and device for calculating remaining charging time of battery, electronic equipment and storage medium |
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