CN111458650B - Method for estimating peak power of lithium ion power battery system - Google Patents
Method for estimating peak power of lithium ion power battery system Download PDFInfo
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- CN111458650B CN111458650B CN202010043447.2A CN202010043447A CN111458650B CN 111458650 B CN111458650 B CN 111458650B CN 202010043447 A CN202010043447 A CN 202010043447A CN 111458650 B CN111458650 B CN 111458650B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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Abstract
The invention relates to a method for estimating the peak power of a lithium ion power battery system, (1) carrying out peak power test on single batteries forming the battery system at different temperatures and SOC; (2) Calculating the peak power of the single battery through the charging ohmic internal resistance, the discharging ohmic internal resistance and the voltage of the single battery; (3) Estimating the peak power P of the battery system under different temperatures and SOC by combining the peak power of the single battery according to the electric quantity required by the power battery system and the serial number and parallel number of the battery system; (4) The result of the peak power estimation of the battery system is corrected. The invention can solve the problems of repeated random experiments, long period, large workload and high requirements on test equipment in the process of directly measuring the peak power of the conventional battery system, and has good universality for different types of lithium ion batteries.
Description
Technical Field
The invention belongs to the technical field of lithium ion power batteries, and particularly relates to a method for estimating the peak power of a lithium ion power battery system.
Background
With the increasing increase Of energy and environmental problems, new energy vehicles have become the key direction Of future development Of various countries, and since lithium ion batteries have the advantages Of high energy density and low cost, lithium ion batteries are widely applied to electric vehicles, and the State Of Power (SOP) is the limit Power that batteries can input and output in different states, and represents the bearing capacity Of the batteries on charge and discharge Power. The peak power is one of important performance indexes of the electric automobile, acceleration and climbing are carried out according to an SOP strategy formulated by a BMS during vehicle running, reasonable use of the battery is achieved, overcharge or overdischarge of the battery is avoided, and the service life of the battery is prolonged.
Disclosure of Invention
The invention aims to provide a method for estimating the peak power of a lithium ion power battery system, which solves the problems that repeated random experiments exist in the process of directly measuring the peak power of the conventional battery system, the period is long, the workload is large, and the requirement on test equipment is high.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of estimating peak power in a lithium ion power battery system, comprising the steps of:
(1) Carrying out peak power test on the single batteries forming the battery system at different temperatures and SOC, wherein the peak power test temperature comprises the following steps: 55 ℃, 45 ℃, 25 ℃, 10 ℃, 0 ℃, 10 ℃, 20 ℃ and SOC ranges are as follows: 10 to 90 percent.
(2) Calculating the peak power of the single battery through the charging ohm internal resistance, the discharging ohm internal resistance and the voltage of the single battery;
(3) Estimating the peak power P of the battery system under different temperatures and SOC (state of charge) by combining the peak power of the single battery according to the electric quantity required by the power battery system and the serial number and parallel number of the battery system;
(4) The result of the peak power estimation of the battery system is corrected.
In the step (1), the single battery is subjected to peak power test, and the specific steps are as follows:
(11) Fully charging the single cell at a set temperature with a constant current and a constant voltage of 1C, and then standing for a period of time at an environmental temperature to be measured;
(12) Stopping discharging after the constant current discharging of 1C is cut to the voltage, and recording the discharging capacity at the temperature;
(13) After the single battery is fully charged with a 1C constant current and a constant voltage at a set temperature, the single battery is placed for a period of time at the environment temperature to be detected, and the 1C constant current discharge adjusts the SOC of the single battery to be 90%;
(14) Laying the single cell for 1h, recording the open-circuit voltage V 1 Discharging with 5Q constant current for t seconds, and recording the discharge voltage V of the t second t1 Laying aside for 40s, recording open circuit voltage V 3 Then use the 3.75Q current to charge the V with constant current S Recording the charging voltage V t2 ；
(15) Discharging at a constant current of 1C, adjusting the SOC to 80%, repeating the step (14), sequentially testing 70% -20% of peak power tests under different SOCs by taking 10% as a difference value, and stopping testing until the SOC reaches 10%;
(16) And calculating the peak power value P of the single battery under different temperatures and SOC.
Wherein the monomer peak power test temperature in the step (1) comprises the following steps: 55 ℃, 45 ℃, 25 ℃, 10 ℃, 0 ℃, 10 ℃, 20 ℃ and SOC ranges are as follows: 10 to 90 percent.
In the step (2), the peak-to-peak power P of the single battery is calculated according to the data of the single peak power test 60S in the step (1), and the following formula is combined:
wherein: r is 1 To charge ohmic internal resistance, R 2 To discharge ohmic internal resistance, V 1 、V 3 Is an open circuit voltage, V min 、V max Respectively the upper and lower limit voltage, V, of the charge and discharge of the single battery t1 Voltages V of 10S, 20S, 30S, 40S, 50S, 60S were obtained from discharge 60S test data, respectively t2 Voltages of 10S, 20S, 30S, 40S, 50S, 60S were obtained from the charging 60S test data, respectively.
In the step (4), the correction is performed by the following formula:
P′＝P(T,t,soc)*M*N*λ
wherein: t is the ambient temperature of the battery, T is the charging and discharging time, soc is the battery charge state M is the battery system string number, N is the battery system parallel number, lambda is the correction factor, the value is 0.7, and P represents the peak power of the single battery.
According to the technical scheme, the method for estimating the peak power of the lithium ion power battery system can solve the problems that repeated random experiments exist in the process of directly measuring the peak power of the conventional battery system, the period is long, the workload is large, and the requirement on test equipment is high.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings:
as shown in fig. 1, the method for estimating the peak power of the lithium ion power battery system according to the embodiment specifically includes:
the peak power of the battery system (electric quantity =40ah × 358.4v =14.336kwh) in which the single battery is normally rated at 20Ah and grouped is used as the target reference steps a) to d) for estimation.
The method comprises the following steps: the method comprises the following steps of carrying out peak power on single batteries forming the battery system at different temperatures and SOC, wherein the specific test steps are as follows:
s1, charging a single battery at 25 ℃ by using a 1C (20A) constant current to a constant voltage of 3.65V, standing at the temperature of an environment to be tested after the current 1A is fully charged, discharging by using the 1C (20A) constant current to a voltage of 2.0V, stopping discharging, and recording the discharge capacity Q at the temperature;
s2, charging the single battery at a constant current of 1C20A to a constant voltage of 3.65V at 25 ℃, standing for 20h at the ambient temperature to be measured after the battery is fully charged by current 0.05C (1A), and discharging at a constant current of 1C (20A) to adjust the SOC of the single battery to be 90%;
s3, laying the single batteries for 1 hour; recording open circuit voltage V1, discharging with 5 × Q constant current for 60S, recording discharge voltage Vt1 (wherein t records a voltage every 10S), standing for 40S, recording open circuit voltage V3, charging with 3.75 × Q current for 60S, and recording charge voltage Vt2 (wherein t records a voltage every 10S);
and S4, discharging at a constant current of 1C (20A), adjusting the SOC to 80%, repeating the step S3, and testing the pulse charging and discharging performance under different SOCs by analogy until the SOC reaches 10%.
S5, finally calculating the peak power value P of the single battery with different temperatures and SOC
Step two: calculating the peak-to-peak power P of the single battery according to the data of the test 60S in the step one and combining the following formula:
ohmic resistance to charging R 1 ＝(V t2 -V 3 )/3.75Q (1)
Ohmic internal resistance R of discharge 2 ＝(V 1 -V t1 )/5Q (2)
P Put ＝(V 1 -V min )*V min /R 2 (3)
P Charging device ＝(V max -V 3 )*V max /R 1 (4)
Wherein: v1 and V3 are open circuit voltages; vmin and Vmax are respectively the charge-discharge upper and lower limit voltages of the single battery and are 2.0-3.65V; v t1 To obtain voltages of 10S, 20S, 30S, 40S, 50S, 60S from the discharge 60S test data, respectively. V t2 Voltages of 10S, 20S, 30S, 40S, 50S, 60S were obtained for charging 60S test data.
As shown in Table 1 below, the peak power of 20Ah cell at 25 ℃ was calculated for 10% to 90% SOC and 10s (Vmin =2.0V, vmax = 3.65V)
According to 60s pulse test data, obtaining the voltages Vt1 and Vt2 of 20s, 30s, 40s, 50s and 60s respectively, and calculating the peak power of the 20Ah single battery at 25 ℃ under the conditions that the SOC is 10% -90%, 20s, 30s, 40s, 50s and 60s by analogy.
Step three: the number of strings (M) and the number of parallel strings (N) of the battery system are calculated according to the power demand of the power battery system, and for the battery system (electric quantity =40AH × 358.4V = 14.336Kwh), the number of strings M =358.4/3.2=112, and the number N =40Ah/20Ah =2, the peak power under the ideal condition is corrected by considering the influence of the consistency of the batteries and the service life of the batteries, wherein the correction factor λ =0.7.
The peak power of the battery system was estimated by calculating the peak power of 20Ah cells at 25 ℃, SOC10% to 90%, 10s according to table 1, and the results are shown in table 2:
by analogy, the peak power of the battery system at different temperatures and under the conditions of SOC10% -90%, 10s, 20s, 30s, 40s, 50s and 60s can be calculated.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (4)
1. A method for estimating the peak power of a lithium ion power battery system is characterized by comprising the following steps:
(1) Carrying out peak power test on the single batteries forming the battery system at different temperatures and SOC;
(2) Calculating the peak power of the single battery through the charging ohm internal resistance, the discharging ohm internal resistance and the voltage of the single battery;
(3) Estimating the peak power P of the battery system under different temperatures and SOC (state of charge) by combining the peak power of the single battery according to the electric quantity required by the power battery system and the serial number and parallel number of the battery system;
(4) Correcting the result of the peak power estimation of the battery system;
in the step (1), the single battery is subjected to peak power test, and the specific steps are as follows:
(11) Fully charging the single cell at a set temperature with a constant current and a constant voltage of 1C, and then standing for a period of time at an environmental temperature to be measured;
(12) Stopping discharging after the constant current discharging of 1C is cut to the voltage, and recording the discharging capacity at the temperature;
(13) After the single battery is fully charged with a 1C constant current and a constant voltage at a set temperature, the single battery is placed for a period of time at the environment temperature to be detected, and the 1C constant current discharge adjusts the SOC of the single battery to be 90%;
(14) Placing the single battery1h, recording the open-circuit voltage V 1 Discharging with 5Q constant current for t seconds, and recording the discharge voltage V of t second t1 Laying aside for 40s, recording open circuit voltage V 3 Then use the 3.75Q current to charge the V with constant current S Recording the charging voltage V t2 ；
(15) Discharging at a constant current of 1C, adjusting the SOC to 80%, repeating the step (14), sequentially testing 70% -20% of peak power tests under different SOCs by taking 10% as a difference value, and stopping testing until the SOC reaches 10%;
(16) And calculating the peak power value P of the single battery under different temperatures and SOC.
2. The method of lithium ion power battery system peak power estimation of claim 1, wherein: in step (1), the peak power test temperature includes: 55 ℃, 45 ℃, 25 ℃, 10 ℃, 0 ℃, 10 ℃, 20 ℃ and SOC ranges are as follows: 10 to 90 percent.
3. The method of estimating peak power in a lithium ion power battery system of claim 1, wherein: in the step (2), the calculation of the peak power P of the single battery is based on the data of the peak power test 60S of the single battery in the step (1), and is combined with the following formula:
wherein: r is 1 To charge ohmic internal resistance, R 2 To discharge ohmic internal resistance, V 1 、V 3 Is open circuit voltage, V min 、V max Respectively the upper and lower limit voltage, V, of the charge and discharge of the single battery t1 Voltages V of 10S, 20S, 30S, 40S, 50S, 60S were obtained from discharge 60S test data, respectively t2 Voltages of 10S, 20S, 30S, 40S, 50S, 60S were obtained from the charging 60S test data, respectively.
4. The method of lithium ion power battery system peak power estimation of claim 1, wherein: in the step (4), the correction is performed by the following formula:
P′＝P(T,t,soc)*M*N*λ
wherein: t is the ambient temperature of the battery, T is the charging and discharging time, soc is the battery charge state M is the battery system string number, N is the battery system parallel number, lambda is the correction factor, the value is 0.7, and P represents the peak power of the single battery.
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| CN112034354B (en) * | 2020-08-31 | 2023-05-09 | 蜂巢能源科技有限公司 | Battery power switching method and device, computer equipment and storage medium |
| CN112649743A (en) * | 2020-11-05 | 2021-04-13 | 天津恒天新能源汽车研究院有限公司 | Battery system testing method suitable for production |
| CN112485673B (en) * | 2020-11-19 | 2022-04-08 | 哈尔滨工业大学（威海） | Battery charging and discharging peak power prediction method based on dynamic multiple safety constraints |
| CN113492724B (en) * | 2021-07-28 | 2023-12-08 | 合肥国轩高科动力能源有限公司 | SOP prediction method, storage medium and device for power battery based on Hurst index |
| CN113657459A (en) * | 2021-07-28 | 2021-11-16 | 合肥国轩高科动力能源有限公司 | Battery SOC prediction method and medium based on combination of principal component and support vector machine |
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