CN112098853A - Capacity attenuation battery discharge power determination method and device - Google Patents
Capacity attenuation battery discharge power determination method and device Download PDFInfo
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Abstract
The invention discloses a method and a device for determining discharge power of a capacity fading battery, wherein the method comprises the following steps: acquiring the direct-current internal resistance value of a full-capacity battery and the direct-current internal resistance value of a capacity attenuation battery; dividing the direct-current internal resistance value of the full-capacity battery under the same temperature condition by the direct-current internal resistance value of the capacity fading battery to obtain a correction coefficient; and obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery. The invention also discloses a device for determining the discharge power of the aged battery, which comprises: the acquisition module is used for acquiring the direct-current internal resistance value of the new battery and the direct-current internal resistance value of the aged battery; the correction calculation module is used for dividing the direct-current internal resistance value of the new battery under the same condition by the direct-current internal resistance value of the aged battery to obtain a correction coefficient; and the aged battery discharge power determining module is used for obtaining the aged battery discharge power according to the correction coefficient and the discharge power of the new battery. The method and the device are simple and easy to implement, are closer to the actual use state of the battery, and have good application value.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a method and a device for determining discharge power of a capacity fading battery.
Background
As lithium ion batteries have the advantages of high voltage, high energy density and long cycle life, along with the continuous popularization of electric vehicles, lithium ion power 0 batteries also become one of the secondary batteries with the widest application range. However, at the same time, as the power battery is continuously used, the power performance of the power battery is further reduced, but the reduction of the power is not linear, and how to accurately correct the correction coefficient of the power during the normal use of the power battery is a difficult problem in the industry.
In the conventional scheme, the discharge power of the battery is calibrated mainly by measuring the discharge power at different temperatures and different SOCs at the initial stage of the full-capacity battery, and during normal use, the power coefficient is corrected empirically on the basis of capacity fading, for example, when the capacity fades from 100% to 85%, the power coefficient is corrected from 100% to 85%, although there is no problem during actual use, the real capacity of the discharge power of the battery at 85% SOH is not achieved, and a part of the actual capacity is not exerted, so further research is needed, and the correction coefficient of the power is provided more accurately.
Disclosure of Invention
The invention aims to provide a method and a device for determining the discharge power of a capacity fading battery so as to solve the problem that the discharge power of the capacity fading battery is not corrected accurately in the prior art.
To solve the above problem, a first aspect of the present invention provides a capacity fade battery discharge power determination method, including: acquiring the direct-current internal resistance value of a full-capacity battery and the direct-current internal resistance value of a capacity attenuation battery; dividing the direct-current internal resistance value of the full-capacity battery under the same temperature condition by the direct-current internal resistance value of the capacity fading battery to obtain a correction coefficient; and obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery.
Optionally, the obtaining of the dc internal resistance value of the full-capacity battery and the dc internal resistance value of the capacity fading battery includes: acquiring a full-capacity battery dynamic voltage value and a full-capacity battery dynamic current value; the initial voltage value of the full-capacity battery before the test is carried out is differentiated from the dynamic voltage at the end of the test to obtain a voltage difference value; taking the ratio of the voltage difference value to the dynamic current of the full-capacity battery as the direct-current internal resistance value of the full-capacity battery; full capacity battery; acquiring a capacity fading battery dynamic voltage value and a capacity fading battery dynamic current value; the initial voltage value of the capacity fading battery before the test is carried out is differed from the dynamic voltage at the end of the test to obtain a voltage difference value; and taking the ratio of the voltage difference value to the dynamic current of the capacity attenuation battery as the capacity attenuation battery of the capacity attenuation battery direct-current internal resistance value.
Optionally, the obtaining of the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery specifically includes: and multiplying the correction coefficient by the full-capacity battery discharge power to obtain the capacity fading battery discharge power.
Optionally, after the correcting the capacity-attenuated battery discharge power by using the correction coefficient, the method further includes: and verifying the correction coefficient.
Optionally, the verifying the correction coefficient includes: acquiring a first dynamic voltage of the corrected capacity attenuation battery during a first preset discharge time; acquiring a second dynamic voltage of a full-capacity battery during a first preset discharge time; subtracting the second dynamic voltage from the first dynamic voltage to obtain a voltage difference; and when the voltage difference is less than or equal to a preset voltage difference, determining that the discharge power of the capacity attenuation battery is available.
Optionally, the preset voltage difference is 50 mV.
Optionally, when the voltage difference is greater than a preset voltage difference; correcting the capacity-decaying battery discharge power again based on a preset gradient.
Optionally, the preset gradient is to adjust the discharge power of the capacity-decreasing battery up to 2% per 50 mV.
Optionally, after revising the discharge power of the capacity-attenuated battery based on the preset gradient, the method further includes: and repeatedly verifying the discharge power of the capacity fading battery, and correcting the discharge power of the capacity fading battery based on a verification result until the voltage difference is less than or equal to a preset voltage difference.
According to another aspect of the present invention, there is provided a capacity fade battery discharge power determination apparatus comprising: the acquisition module is used for acquiring the direct-current internal resistance value of the full-capacity battery and the direct-current internal resistance value of the capacity attenuation battery; the correction calculation module is used for dividing the full-capacity battery direct-current internal resistance value under the same condition by the capacity attenuation battery direct-current internal resistance value to obtain a correction coefficient; and the capacity fading battery discharging power determining module is used for obtaining the capacity fading battery discharging power according to the correction coefficient and the discharging power of the full-capacity battery.
Optionally, the obtaining module includes: the full-capacity battery dynamic voltage acquisition unit is used for acquiring a full-capacity battery dynamic voltage value and a full-capacity battery dynamic current value; the full-capacity battery direct-current internal resistance calculation unit is used for subtracting an initial voltage value of the full-capacity battery before testing and a dynamic voltage at the end of testing to obtain a voltage difference value, and taking a ratio of the voltage difference value and the dynamic current of the full-capacity battery as a direct-current internal resistance value of the full-capacity battery, namely the full-capacity battery; the capacity attenuation battery dynamic voltage acquisition unit is used for acquiring a capacity attenuation battery dynamic voltage value and a capacity attenuation battery dynamic current value; and the capacity attenuation battery direct-current internal resistance calculation unit is used for obtaining a voltage difference value by subtracting the initial voltage value of the capacity attenuation battery before the test and the dynamic voltage at the end of the test, and taking the ratio of the voltage difference value and the dynamic current of the capacity attenuation battery as the capacity attenuation battery of the capacity attenuation battery direct-current internal resistance value capacity attenuation battery.
Optionally, the capacity fading battery discharge power determining module is specifically configured to multiply the correction coefficient by the full-capacity battery discharge power to obtain the capacity fading battery discharge power.
Optionally, the method further includes: and the verification module is used for verifying the correction coefficient.
Optionally, the verification module includes: the corrected capacity fading battery dynamic voltage obtaining unit is used for obtaining a first dynamic voltage of the corrected capacity fading battery during discharging for a first preset time; the full-capacity battery dynamic voltage acquisition unit is used for acquiring a second dynamic voltage of the full-capacity battery during a first preset time; the voltage difference calculation unit is used for subtracting the second dynamic voltage from the first dynamic voltage to obtain a voltage difference; the comparison unit is used for comparing the voltage difference obtained by the calculation of the voltage difference calculation unit with a preset voltage difference; the capacity fading battery discharging power determining module is further configured to determine that the capacity fading battery discharging power is available when the voltage difference is less than or equal to a preset voltage difference.
Optionally, the preset voltage difference is 50 mV.
Optionally, the capacity fading battery discharge power determining module is further configured to determine whether the voltage difference is greater than a preset voltage difference; correcting the capacity-decaying battery discharge power again based on a preset gradient.
Optionally, the preset gradient is to adjust the discharge power of the capacity-decreasing battery up to 2% per 50 mV.
Optionally, the method further includes: and the circulating module is used for repeatedly verifying the discharge power of the capacity fading battery and correcting the discharge power of the capacity fading battery based on a verification result until the voltage difference is less than or equal to a preset voltage difference.
According to a further aspect of the present invention, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any one of the above-described aspects.
According to a further aspect of the present invention, there is provided a vehicle comprising a memory, a display, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any one of the above aspects when executing the program.
The invention provides a method for correcting the full life cycle discharge power of a lithium ion power battery, which comprises the steps of respectively carrying out single battery direct current internal resistance experiments on batteries of the same system in different battery health states, establishing direct current internal resistance data matrixes of the batteries in different battery health states at different temperatures, and in different battery health states, then comparing the direct current internal resistance data with the direct current internal resistance data of a full-capacity battery, calculating the direct current internal resistance increase rate and the power attenuation rate under the condition, and determining the discharge power correction coefficient of the capacity attenuation battery according to the discharge power correction coefficient of the full-capacity battery in the state of the ratio of the direct current internal resistance to the direct current internal resistance of the battery in the current aging state. The method is simple and easy to implement, is closer to the actual use state of the battery, and has good application value.
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Fig. 1 is a flowchart of a capacity fade battery discharge power determination method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a capacity fade battery discharge power determination method in accordance with an alternative embodiment of the present invention;
FIG. 3 is a block diagram schematic of a capacity fade battery discharge power determination device in accordance with another aspect of an embodiment of the invention;
fig. 4 is a block diagram schematically illustrating the structure of a capacity fade battery discharge power determination device according to an embodiment of the present invention.
Reference numerals
1; full capacity battery: 2: a capacity-fading battery; 3: an acquisition module; 4: a correction calculation module; 5: a capacity fade battery discharge power determination module; 6: a verification module; 7: a circulation module; 31: a full capacity battery dynamic voltage acquisition unit; 32: a full-capacity battery direct-current internal resistance calculation unit; 33: a capacity fading battery dynamic voltage acquisition unit; 34: and a capacity attenuation battery direct current internal resistance calculation unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Abbreviations mean:
DCR: is an abbreviation of English direct Current Resistance, and the Chinese meaning is direct Current internal Resistance;
SOH: is an abbreviation of English state of health, and Chinese means the health state of the battery and is related to the capacity of the battery;
SOC: is an abbreviation for english state of charge, and chinese means battery state of charge.
As shown in fig. 1, in a first aspect of the embodiments of the present invention, there is provided a capacity fade battery discharge power determining method, including:
s1: acquiring the direct-current internal resistance value of a full-capacity battery and the direct-current internal resistance value of a capacity attenuation battery;
s2: dividing the direct-current internal resistance value of the full-capacity battery under the same temperature condition by the direct-current internal resistance value of the capacity fading battery to obtain a correction coefficient;
s3: and obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery.
The method of the embodiment uses batteries of the same system and different battery health states to respectively perform single battery direct current internal resistance experiments, establishes direct current internal resistance data matrixes of the batteries under different battery health states at different temperatures and different battery health states, compares the direct current internal resistance data with the direct current internal resistance data of the full-capacity battery, calculates the direct current internal resistance increase rate and the attenuation rate of power under the condition, calculates the ratio of the direct current internal resistance of the full-capacity battery to the direct current internal resistance of the battery under the current aging state as a discharge power correction coefficient under the state, and determines the discharge power of the capacity attenuated battery according to the correction coefficient. The method is simple and easy to implement, is closer to the actual use state of the battery, and has good application value.
In an alternative embodiment of the present invention, as shown in fig. 2, there is provided a capacity fade battery discharge power determination method, including:
acquiring the direct-current internal resistance value of a full-capacity battery and the direct-current internal resistance value of a capacity attenuation battery;
dividing the direct-current internal resistance value of the full-capacity battery under the same condition by the direct-current internal resistance value of the capacity fading battery to obtain a correction coefficient;
obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery;
and verifying the correction coefficient.
In the embodiment of the present invention, obtaining the dc internal resistance value of the full capacity battery and the dc internal resistance value of the capacity fading battery includes:
acquiring a full-capacity battery dynamic voltage value and a full-capacity battery dynamic current value;
the initial voltage value of the full-capacity battery before the test is carried out is differentiated from the dynamic voltage at the end of the test to obtain a voltage difference value;
taking the ratio of the voltage difference value to the dynamic current of the full-capacity battery as the direct-current internal resistance value of the full-capacity battery and the full-capacity battery of the full-capacity battery;
acquiring a capacity fading battery dynamic voltage value and a capacity fading battery dynamic current value;
the initial voltage value of the capacity fading battery before the test is carried out is differed from the dynamic voltage at the end of the test to obtain a voltage difference value;
and taking the ratio of the voltage difference value to the dynamic current of the capacity attenuation battery as the capacity attenuation battery of the capacity attenuation battery direct-current internal resistance value.
In the embodiment of the present invention, obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery specifically includes:
and multiplying the correction coefficient by the full-capacity battery discharge power to obtain the capacity fading battery discharge power.
Wherein verifying the correction factor comprises:
acquiring a first dynamic voltage of the corrected capacity attenuation battery during a first preset discharge time;
acquiring a second dynamic voltage of a full-capacity battery during a first preset discharge time;
subtracting the second dynamic voltage from the first dynamic voltage to obtain a voltage difference;
and when the voltage difference is less than or equal to the preset voltage difference, determining that the discharge power of the capacity fading battery is available. Wherein the preset voltage difference is 50 mV; the first preset time is 1-60 s.
When the voltage difference is greater than the preset voltage difference; the capacity fade battery discharge power is corrected again based on the preset gradient. Wherein the preset gradient is that the discharge power of the capacity fading battery is adjusted up to 2% every 50 mV. After correcting the capacity fade battery discharge power again based on the preset gradient, the method further comprises the following steps: and repeatedly verifying the discharge power of the capacity fading battery, and correcting the discharge power of the capacity fading battery based on the verification result until the voltage difference is less than or equal to the preset voltage difference.
The method of the embodiment uses the batteries of the same system and different battery health states to respectively carry out a single battery direct current internal resistance experiment, establishes direct current internal resistance data matrixes of the batteries under different battery health states at different temperatures and different battery health states, then compares the direct current internal resistance data under different conditions with the initial direct current internal resistance data, calculates the direct current internal resistance increase rate and the power attenuation rate under the conditions, verifies the calculated power value on the single battery in a specific state, compares the power value with the test cut-off voltage of the battery tested by the full-capacity battery under the condition, if the cut-off voltage is the same, the correction coefficient is a discharge power correction coefficient under the state, if the power value is higher or lower than the cut-off voltage, the difference value and the power value of the two voltages are required to be corrected, and the verification is continued until the two values are equal, and finally, after the two voltages are consistent, the discharge power correction coefficient under the condition is obtained. The method is simple and easy to implement, is closer to the actual use state of the whole vehicle, and has good application value.
In a specific embodiment of the invention, the performance data related to the Ah of a certain ternary full-capacity battery 100 obtained through experiments and big data is as follows:
TABLE 1 Battery 10S discharge Power (Unit: W)
| T/SOC | 10％ | 20％ | 30％ | 40％ | 50％ | 60％ | 70％ | 80％ | 90％ | 100％ |
| -20℃ | 69 | 141 | 197 | 253 | 309 | 432 | 556 | 679 | 723 | 784 |
| -10℃ | 139 | 263 | 422 | 581 | 741 | 872 | 1003 | 1135 | 1186 | 1232 |
| 0℃ | 154 | 381 | 637 | 893 | 1148 | 1220 | 1291 | 1360 | 1426 | 1493 |
| 10℃ | 513 | 942 | 1131 | 1320 | 1508 | 1582 | 1656 | 1730 | 1808 | 1885 |
| 25℃ | 948 | 1752 | 1817 | 1883 | 1948 | 2005 | 2062 | 2118 | 2192 | 2255 |
| 45℃ | 869 | 1606 | 1666 | 1726 | 1786 | 1838 | 1890 | 1942 | 2010 | 2067 |
TABLE 2 Battery discharge 10S DCR (unit: m omega milliohm)
| T/SOC | 10％ | 20％ | 30％ | 40％ | 50％ | 60％ | 70％ | 80％ | 90％ | 100％ |
| -20℃ | 17.29 | 10.84 | 8.82 | 6.80 | 6.57 | 6.35 | 6.44 | 6.54 | 7.26 | 7.98 |
| -10℃ | 9.89 | 4.30 | 3.73 | 3.15 | 3.12 | 3.09 | 3.14 | 3.20 | 3.55 | 3.90 |
| 0℃ | 6.75 | 2.01 | 1.84 | 1.67 | 1.70 | 1.73 | 1.74 | 1.74 | 1.84 | 1.94 |
| 10℃ | 2.50 | 1.14 | 1.07 | 1.00 | 1.03 | 1.06 | 1.06 | 1.06 | 1.09 | 1.12 |
| 25℃ | 1.05 | 0.68 | 0.66 | 0.64 | 0.66 | 0.68 | 0.69 | 0.69 | 0.69 | 0.69 |
| 45℃ | 0.77 | 0.49 | 0.48 | 0.46 | 0.48 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 |
TABLE 3 Battery static SOC-OCV (Unit: V)
| T/SOC | 10％ | 20％ | 30％ | 40％ | 50％ | 60％ | 70％ | 80％ | 90％ | 100％ |
| -20℃ | 3.413 | 3.498 | 3.529 | 3.561 | 3.610 | 3.727 | 3.832 | 3.945 | 4.064 | 4.221 |
| -10℃ | 3.414 | 3.501 | 3.536 | 3.568 | 3.620 | 3.728 | 3.835 | 3.951 | 4.071 | 4.221 |
| 0℃ | 3.404 | 3.495 | 3.531 | 3.562 | 3.613 | 3.729 | 3.836 | 3.951 | 4.072 | 4.215 |
| 10℃ | 3.412 | 3.498 | 3.535 | 3.568 | 3.620 | 3.728 | 3.835 | 3.951 | 4.071 | 4.221 |
| 25℃ | 3.410 | 3.498 | 3.535 | 3.568 | 3.620 | 3.728 | 3.835 | 3.951 | 4.071 | 4.221 |
| 45℃ | 3.396 | 3.489 | 3.533 | 3.567 | 3.620 | 3.733 | 3.842 | 3.957 | 4.076 | 4.211 |
TABLE 4 dynamic Voltage of 10S Battery discharge (Unit: V)
| T/SOC | 10％ | 20％ | 30％ | 40％ | 50％ | 60％ | 70％ | 80％ | 90％ | 100％ |
| -20℃ | 2.489 | 2.567 | 2.589 | 2.616 | 2.717 | 2.913 | 2.939 | 2.985 | 2.988 | 3.016 |
| -10℃ | 2.389 | 2.456 | 2.497 | 2.641 | 2.748 | 2.793 | 2.947 | 2.949 | 3.014 | 3.140 |
| 0℃ | 3.065 | 3.260 | 3.161 | 3.079 | 2.952 | 3.031 | 3.116 | 3.213 | 3.270 | 3.352 |
| 10℃ | 2.982 | 3.157 | 3.151 | 3.151 | 3.123 | 3.203 | 3.302 | 3.413 | 3.509 | 3.641 |
| 25℃ | 3.087 | 3.117 | 3.157 | 3.193 | 3.221 | 3.314 | 3.421 | 3.538 | 3.659 | 3.816 |
| 45℃ | 3.187 | 3.244 | 3.290 | 3.327 | 3.365 | 3.469 | 3.577 | 3.692 | 3.811 | 3.949 |
DCR at 85% SOH was as follows:
TABLE 5 Battery discharge 10S DCR (unit: m omega milliohm)
| T/SOC | 10％ | 20％ | 30％ | 40％ | 50％ | 60％ | 70％ | 80％ | 90％ | 100％ |
| -20℃ | 21.61 | 13.55 | 11.02 | 8.50 | 8.22 | 7.93 | 8.05 | 8.18 | 9.08 | 9.98 |
| -10℃ | 12.36 | 5.38 | 4.66 | 3.94 | 3.90 | 3.86 | 3.93 | 4.00 | 4.44 | 4.87 |
| 0℃ | 8.64 | 2.57 | 2.35 | 2.13 | 2.18 | 2.22 | 2.23 | 2.23 | 2.36 | 2.48 |
| 10℃ | 3.25 | 1.48 | 1.39 | 1.29 | 1.34 | 1.38 | 1.38 | 1.38 | 1.42 | 1.46 |
| 25℃ | 1.37 | 0.88 | 0.85 | 0.83 | 0.86 | 0.89 | 0.89 | 0.90 | 0.89 | 0.89 |
| 45℃ | 0.99 | 0.64 | 0.62 | 0.60 | 0.62 | 0.64 | 0.65 | 0.65 | 0.65 | 0.64 |
Taking the 25 ℃ 50% SOC discharge power as an example, by looking up the full-capacity battery in this state, the discharge power is 1948W, DCR is 0.66m Ω, and the 10S discharge dynamic voltage is 3.221V, the power in the 85% SOH state is:
p85% SOH — DCR 100% SOH/DCR 85% SOH — P100% SOH — 0.66/0.86 — 1948 result equal to 1495W; the actual constant power verification is carried out on 85% SOH at 25 ℃ and 50% SOC by using the discharge power, the dynamic voltage is 3.208V after 10S discharge, the dynamic voltage is compared with the data of a full-capacity battery test, 3.221-3.208 is 0.013V and less than 50mV, the power is available at the moment, and the correction coefficient is 0.66/0.86 and 0.767;
taking the 30% SOC discharge power at 10 ℃ as an example, by looking up the full-capacity battery in this state, the discharge power is 1131W, DCR is 1.07m Ω, and the discharge 10S voltage is 3.151V, the power in the 85% SOH state is:
p85% SOH — DCR 100% SOH/DCR 85% SOH — P100% SOH — 1.07/1.39 — 1131 results equal 871W; verifying actual constant power by using the discharge power at 10 ℃ and 30% of SOC (state of charge), wherein the dynamic voltage is 3.202V after 10S discharge, comparing the dynamic voltage with data tested by a full-capacity battery, and 3.202-3.151-0.051V is more than 50mV, then the power data needs to be adjusted, the adjustment rule is as follows, the power is verified by using the power, the dynamic voltage is 3.161V after 10S discharge and compared with the data tested by the full-capacity battery, the 3.161-3.151-0.01V is less than 50mV, and the power can be used, and the correction coefficient is 888/1131-0.786, wherein the pressure difference is 50mV-100mV, the internal power is adjusted by 2%, and the P85-calculated value is adjusted by 1.02-871-1.02-888W;
in the actual use process, the use strategy is as follows:
1. the full-capacity battery demand data are discharge power values, discharge DCR values and discharge 10S dynamic voltage values under different temperatures and different SOC;
2. the capacity fading battery demand data is DCR values under different temperatures and different SOCs, wherein the test current is a test current value in a state of SOH and full capacity battery, for example, when the DCR current for full capacity battery test is 100A, the DCR current for 85% SOH under the same SOC state is 85A;
3. calculating initial power through the capacity attenuation battery, wherein the calculation method is that P is aged and is DCR100 percent SOH/DCR capacity attenuation battery P100 percent SOH, verifying the power value calculated under the condition on the battery core, comparing the verified power value with the 10S dynamic voltage of the full capacity battery, if the power value is not more than 50mV, the power value is the battery power capacity under the state, if the power value is more than 50mV, correcting the calculated power value according to the actual difference, wherein the correction strategy is that 50mV is used as the reference, the internal power of 50mV-100mV differential pressure is adjusted by 2 percent, the internal power of 50mV-100mV is adjusted by 4 percent, and the like, and verifying is carried out until the two are not more than 50 mV.
The method of the embodiment uses the batteries of the same system and different SOH states to respectively carry out the DCR experiment of the single battery, establishes the DCR data matrix of the batteries under different SOH under different temperatures and different SOC, then comparing the DCR data under different conditions with the initial DCR data, calculating the DCR increase rate and the power decay rate under the conditions, and the power value calculated at the moment is verified on the single battery in a specific state and is compared with the test cut-off voltage of the battery tested by the full-capacity battery under the condition, if the cut-off voltages are the same, the correction factor is the discharge power correction factor in this state, and if it is higher or lower than the cut-off voltage, the difference value of the two voltages and the power value are needed to be corrected, the verification is continued after the correction until the two voltages are equal, and finally, the two voltages are consistent, so that the discharge power correction coefficient is obtained under the condition. The method is simple and easy to implement, is closer to the actual use state of the battery, and has good application value.
As shown in fig. 3, in another aspect of the embodiments of the present invention, there is provided a capacity fade battery discharge power determination device including:
the acquisition module 3 is used for acquiring the direct-current internal resistance value of the full-capacity battery 1 and the direct-current internal resistance value of the capacity attenuation battery 2;
the correction calculation module 4 is used for dividing the direct-current internal resistance value of the full-capacity battery 1 under the same temperature condition by the direct-current internal resistance value of the capacity fading battery 2 to obtain a correction coefficient;
and the capacity fading battery discharging power determining module 5 is used for obtaining the discharging power of the capacity fading battery 2 according to the correction coefficient and the discharging power of the full-capacity battery 1.
The device of the embodiment uses batteries of the same system and different battery health states to respectively perform single battery direct current internal resistance experiments, establishes direct current internal resistance data matrixes of the batteries under different battery health states at different temperatures and different battery health states, compares the direct current internal resistance data with the direct current internal resistance data of the full-capacity battery 1, calculates the direct current internal resistance increase rate and the power attenuation rate under the condition, calculates the ratio of the direct current internal resistance of the full-capacity battery 1 to the direct current internal resistance of the battery in the current aging state as the discharge power correction coefficient under the state, and determines the discharge power of the capacity attenuation battery 2 according to the correction coefficient. The device is simple and easy to implement, is closer to the actual use state of the battery, and has good application value.
In the embodiment of the present invention, the obtaining module 3 includes: a full-capacity battery dynamic voltage obtaining unit 31 for obtaining a full-capacity battery 1 dynamic voltage value and a full-capacity battery 1 dynamic current value; a full-capacity battery direct-current internal resistance calculation unit 32, configured to obtain a voltage difference value by subtracting an initial voltage value of the full-capacity battery 1 before the test is performed and a dynamic voltage at the end of the test, and use a ratio of the voltage difference value to a dynamic current of the full-capacity battery 1 as a direct-current internal resistance value of the full-capacity battery 1 and the full-capacity battery 1 of the full-capacity battery 1; a capacity fade battery dynamic voltage obtaining unit 33, configured to obtain a capacity fade battery 2 dynamic voltage value and a capacity fade battery 2 dynamic current value; and the capacity fading battery direct current internal resistance calculation unit 34 is configured to obtain a voltage difference value by subtracting the initial voltage value of the capacity fading battery 2 before the test and the dynamic voltage at the end of the test, and use a ratio of the voltage difference value to the dynamic current of the capacity fading battery 2 as the direct current internal resistance value of the capacity fading battery 2 and the capacity fading battery 2 of the capacity fading battery 2.
In the embodiment of the present invention, the capacity fade battery discharge power determination module 5 is specifically configured to multiply the correction coefficient by the discharge power of the full-capacity battery 1 to obtain the discharge power of the capacity fade battery 2.
In the embodiment of the present invention, the method further includes: and the verification module 6 is used for verifying the correction coefficient.
In the embodiment of the present invention, the verification module 6 includes: a corrected capacity fading battery dynamic voltage obtaining unit 33, configured to obtain a first dynamic voltage of the corrected capacity fading battery 2 during a first preset discharge time; a full-capacity battery dynamic voltage obtaining unit 31, configured to obtain a second dynamic voltage of the full-capacity battery 1 discharged for a first preset time; wherein the first preset time is 1-60 s; the voltage difference calculation unit is used for subtracting the second dynamic voltage from the first dynamic voltage to obtain a voltage difference; the comparison unit is used for comparing the voltage difference obtained by the calculation of the voltage difference calculation unit with a preset voltage difference; and the capacity fading battery discharging power determining module 5 is further configured to determine that the discharging power of the capacity fading battery 2 is available when the voltage difference is less than or equal to the preset voltage difference.
In the embodiment of the present invention, the predetermined voltage difference is 50 mV.
In the embodiment of the present invention, the capacity fade battery discharge power determination module 5 is further configured to determine whether the voltage difference is greater than a preset voltage difference; the discharge power of the capacity fade battery 2 is corrected again based on the preset gradient.
In an embodiment of the present invention, the predetermined gradient is to adjust the discharge power of the capacity-decreasing battery 2 up to 2% per 50 mV.
In the embodiment of the present invention, the method further includes: and the circulating module 7 is used for repeatedly verifying the discharge power of the capacity fading battery 2 and correcting the discharge power of the capacity fading battery 2 based on the verification result until the voltage difference is less than or equal to the preset voltage difference.
In a further aspect of the embodiments of the present invention, there is provided a storage medium having a computer program stored thereon, the program, when executed by a processor, implementing the steps of any one of the above-described embodiments of the method.
In a further aspect of an embodiment of the present invention, there is provided a vehicle comprising a memory, a display, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the methods of the above embodiments when executing the program.
The invention aims to protect a capacity fading battery discharge power determination method, which comprises the following steps: acquiring the direct-current internal resistance value of a full-capacity battery and the direct-current internal resistance value of a capacity attenuation battery; dividing the direct-current internal resistance value of the full-capacity battery under the same temperature condition by the direct-current internal resistance value of the capacity fading battery to obtain a correction coefficient; and obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery. The method is simple and easy to implement, is closer to the actual use state of the battery, and has good application value.
Another aspect of the present invention is directed to protect a capacity fade battery 2 discharge power determination device, comprising: the acquisition module 3 is used for acquiring the direct-current internal resistance value of the full-capacity battery 1 and the direct-current internal resistance value of the capacity attenuation battery 2; the correction calculation module 4 is used for dividing the direct-current internal resistance value of the full-capacity battery 1 under the same condition by the direct-current internal resistance value of the capacity fading battery 2 to obtain a correction coefficient; and the capacity fading battery discharging power determining module 5 is used for obtaining the discharging power of the capacity fading battery 2 according to the correction coefficient and the discharging power of the full-capacity battery 1. The device is simple and easy to implement, is closer to the actual use state of the battery, and has good application value.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (16)
1. A method for determining discharge power of a capacity fade battery, comprising:
acquiring the direct-current internal resistance value of a full-capacity battery and the direct-current internal resistance value of a capacity attenuation battery;
dividing the direct-current internal resistance value of the full-capacity battery under the same temperature condition by the direct-current internal resistance value of the capacity fading battery to obtain a correction coefficient;
and obtaining the discharge power of the capacity fading battery according to the correction coefficient and the discharge power of the full-capacity battery.
2. The method of claim 1, wherein the obtaining of the full capacity battery dc internal resistance value and the capacity fade battery dc internal resistance value comprises:
acquiring a full-capacity battery dynamic voltage value and a full-capacity battery dynamic current value;
the initial voltage value of the full-capacity battery before the test is carried out is differentiated from the dynamic voltage at the end of the test to obtain a voltage difference value;
taking the ratio of the voltage difference value to the dynamic current of the full-capacity battery as the direct-current internal resistance value of the full-capacity battery;
acquiring a capacity fading battery dynamic voltage value and a capacity fading battery dynamic current value;
the initial voltage value of the capacity fading battery before the test is carried out is differed from the dynamic voltage at the end of the test to obtain a voltage difference value;
and taking the ratio of the voltage difference value to the dynamic current of the capacity attenuation battery as the direct current internal resistance value of the capacity attenuation battery.
3. The method according to claim 1, wherein the obtaining of the capacity-degraded battery discharge power according to the correction factor and the discharge power of the full-capacity battery is specifically:
and multiplying the correction coefficient by the full-capacity battery discharge power to obtain the capacity fading battery discharge power.
4. The method of claim 1, further comprising, after said deriving said capacity-degraded battery discharge power from said correction factor and said full-capacity battery discharge power,:
and verifying the correction coefficient.
5. The method of claim 4, wherein the verifying the correction factor comprises:
acquiring a first dynamic voltage of the corrected capacity attenuation battery during a first preset discharge time;
acquiring a second dynamic voltage of a full-capacity battery during a first preset discharge time;
subtracting the second dynamic voltage from the first dynamic voltage to obtain a voltage difference;
and when the voltage difference is less than or equal to a preset voltage difference, determining that the discharge power of the capacity attenuation battery is available.
6. The method according to claim 5, wherein the preset voltage difference is 50 mV.
7. The method of claim 5,
when the voltage difference is greater than a preset voltage difference;
correcting the capacity-decaying battery discharge power again based on a preset gradient.
8. The method of claim 7, wherein the preset gradient is an up-regulation of the capacity-decaying battery discharge power of 2% per 50 mV.
9. The method of claim 7, further comprising, after revising the capacity-decaying battery discharge power based on a preset gradient:
and repeatedly verifying the discharge power of the capacity fading battery, and correcting the discharge power of the capacity fading battery based on a verification result until the voltage difference is less than or equal to a preset voltage difference.
10. A capacity fade battery discharge power determination device, comprising:
the acquisition module is used for acquiring the direct-current internal resistance value of the full-capacity battery and the direct-current internal resistance value of the capacity attenuation battery;
the correction calculation module is used for dividing the full-capacity battery direct-current internal resistance value under the same temperature condition by the capacity attenuation battery direct-current internal resistance value to obtain a correction coefficient;
and the capacity fading battery discharging power determining module is used for obtaining the capacity fading battery discharging power according to the correction coefficient and the discharging power of the full-capacity battery.
11. The apparatus of claim 10, wherein the obtaining module comprises:
the full-capacity battery dynamic voltage acquisition unit is used for acquiring a full-capacity battery dynamic voltage value and a full-capacity battery dynamic current value;
the full-capacity battery direct-current internal resistance calculation unit is used for subtracting an initial voltage value of the full-capacity battery before testing and a dynamic voltage at the end of testing to obtain a voltage difference value, and taking a ratio of the voltage difference value to the dynamic current of the full-capacity battery as a full-capacity battery direct-current internal resistance value;
the capacity attenuation battery dynamic voltage acquisition unit is used for acquiring a capacity attenuation battery dynamic voltage value and a capacity attenuation battery dynamic current value;
and the capacity fading battery direct current internal resistance calculation unit is used for subtracting the initial voltage value of the capacity fading battery before the testing and the dynamic voltage at the end of the testing to obtain a voltage difference value, and taking the ratio of the voltage difference value and the dynamic current of the capacity fading battery as the capacity fading battery direct current internal resistance value.
12. The apparatus of claim 10, wherein the capacity fade battery discharge power determination module is specifically configured to multiply the correction factor by the full capacity battery discharge power to obtain the capacity fade battery discharge power.
13. The apparatus of claim 10, further comprising:
and the verification module is used for verifying the correction coefficient.
14. The apparatus of claim 13, wherein the verification module comprises:
the corrected capacity fading battery dynamic voltage obtaining unit is used for obtaining a first dynamic voltage of the corrected capacity fading battery during discharging for a first preset time;
the full-capacity battery dynamic voltage acquisition unit is used for acquiring a second dynamic voltage of the full-capacity battery during a first preset time;
the voltage difference calculation unit is used for subtracting the second dynamic voltage from the first dynamic voltage to obtain a voltage difference;
the comparison unit is used for comparing the voltage difference obtained by the calculation of the voltage difference calculation unit with a preset voltage difference;
the capacity fading battery discharging power determining module is further configured to determine that the capacity fading battery discharging power is available when the voltage difference is less than or equal to a preset voltage difference.
15. A storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method according to any one of claims 1-9.
16. A vehicle comprising a memory, a display, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any one of claims 1 to 9 when the program is executed.
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| CN116540108A (en) * | 2023-07-06 | 2023-08-04 | 广汽埃安新能源汽车股份有限公司 | Method, device, storage medium and equipment for early warning of capacity attenuation of battery cell |
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| CN117420471A (en) * | 2023-12-18 | 2024-01-19 | 深圳鑫资物联科技有限公司 | Performance test method, system and equipment of mobile power supply and storage medium thereof |
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