CN109507611B - SOH correction method and system for electric vehicle - Google Patents
SOH correction method and system for electric vehicle Download PDFInfo
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Abstract
The invention provides a method and a system for correcting SOH of an electric automobile, wherein the method comprises the following steps: and obtaining the corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests, and establishing an OCV-SOC corresponding table of the power battery. When the power battery is charged and discharged after being fully charged in a slow charging mode, the accumulated discharge capacity C of the battery is obtained1And the cumulative charging capacity C2. And before the next time of full charge of the power battery, judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV. If yes, obtaining the open-circuit voltage OCV of the power battery, and obtaining the corresponding SOC through the OCV-SOC corresponding table lookupOCVCorrection value according to SOCOCVAnd correcting the SOH of the power battery by the correction value. The invention can improve the safety and intelligence of the electric automobile.
Description
Technical Field
The invention relates to the technical field of batteries of electric vehicles, in particular to a method and a system for correcting SOH of an electric vehicle.
Background
With the continuous attenuation of the capacity of the power battery of the electric automobile in the use process, the difference of the consistency of the battery is gradually increased, and the SOH value of the battery pack of the pure electric automobile is also continuously attenuated. During the driving of an electric vehicle, it is necessary to be able to estimate the state of health (SOH) of the battery pack to evaluate how much capacity of the battery pack remains to be effectively used. If the accuracy of the SOH is not high, the state of charge (SOC) of the battery is inaccurate, and the estimation error of the SOC is large, which may cause the electric vehicle to be forced to stop halfway due to insufficient electric quantity.
The SOH estimation method mainly adopted in the current market is a life cycle method (calendar life + cycle life), namely, a table of SOH values corresponding to the cycle life (a table made by a battery manufacturer by constructing a model to simulate the battery to run under a certain working condition) is searched by reading the service time and the accumulated charge-discharge ampere hour of the battery, so as to obtain the SOH value of the power battery. The method is simple to operate, but the actual operation working conditions of the power battery are different in a wide range in the using process, and most of the power battery are different from the simulation working conditions greatly, so that the method has larger error in the application process.
Disclosure of Invention
The invention provides a method and a system for correcting SOH of an electric automobile, which solve the problem that the SOH estimation value of the conventional electric automobile is inaccurate, and can improve the safety and intelligence of the electric automobile.
In order to achieve the above purpose, the invention provides the following technical scheme:
an SOH correction method of an electric vehicle comprises the following steps:
obtaining a corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests, and establishing an OCV-SOC corresponding table of the power battery;
when the power battery is charged and discharged after being fully charged in a slow charging mode, the accumulated discharge capacity C of the battery is obtained1And the cumulative charging capacity C2；
Before the next time of full charge of the power battery, judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV;
if yes, obtaining the open-circuit voltage OCV of the power battery, and obtaining the corresponding SOC through the OCV-SOC corresponding table lookupOCVCorrection value according to SOCOCVAnd correcting the SOH of the power battery by the correction value.
Preferably, the method further comprises the following steps:
if not, accumulating the discharge capacity C according to the battery after the electric quantity of the vehicle is completely discharged1And the accumulated charging capacity C2And calculating to obtain the SOH of the power battery.
Preferably, theAccording to SOCOCVThe correction value is used for correcting the SOH of the power battery and comprises the following steps:
according to the formula:
calculating to obtain the actual capacity C of the power batteryS；
Obtaining rated capacity C of power batteryeAnd according to the formula:
obtaining a calculated value of SOH;
and correcting the calculated SOH value as the SOH of the power battery.
Preferably, the discharge capacity C is accumulated according to the battery1And the accumulated charging capacity C2Calculating the SOH of the power battery, comprising the following steps:
according to the formula: cS＝C1-C2Calculating to obtain the actual capacity C of the power batteryS；
And taking the ratio of the actual capacity to the rated capacity of the power battery as the SOH correction value of the power battery.
Preferably, the determining whether the power battery satisfies the condition for correcting the SOC of the power battery using the open-circuit voltage OCV includes:
and whether the power battery of the vehicle is kept in a static state for more than or equal to 1h, and if so, the collected lowest voltage of the battery cells is taken as the open-circuit voltage OCV of the power battery.
The invention also provides an SOH correction system of an electric vehicle, comprising:
the setting unit is used for obtaining a corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests and establishing an OCV-SOC corresponding table of the power battery;
an obtaining unit for obtaining the accumulated discharge capacity C of the battery when the power battery is charged and discharged after being fully charged in a slow charging mode1And the cumulative charging capacity C2；
The judging unit is used for judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV or not before the next full charge of the power battery;
the first correction unit is used for acquiring the open-circuit voltage OCV of the power battery when the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV, and obtaining the corresponding SOC through the OCV-SOC corresponding tableOCVCorrection value according to SOCOCVAnd correcting the SOH of the power battery by the correction value.
Preferably, the method further comprises the following steps:
a second correcting unit for correcting the SOC of the power battery according to the accumulated discharge capacity C of the power battery when the power battery does not meet the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV and the vehicle is completely discharged1And the accumulated charging capacity C2And calculating to obtain the SOH of the power battery.
Preferably, the first correcting unit includes:
a first battery capacity calculation unit for calculating a battery capacity of the battery according to the formula:
calculating to obtain the actual capacity C of the power batteryS；
A first SOH calculation unit for obtaining rated capacity C of the power batteryeAnd according to the formula:
and obtaining a calculated SOH value, and correcting the calculated SOH value as the SOH of the power battery.
Preferably, the second correction unit includes:
a second battery capacity calculation unit for calculating a second battery capacity according to the formula: cS＝C1-C2Calculating to obtain the actual capacity C of the power batteryS；
And the second SOH calculation unit is used for taking the ratio of the actual capacity to the rated capacity of the power battery as the SOH correction value of the power battery.
Preferably, the judging unit includes:
and the standing judgment unit is used for judging whether the power battery of the vehicle is kept in a standing state for more than or equal to 1h, and if so, the collected lowest voltage of the battery cells is taken as the open-circuit voltage OCV of the power battery.
The invention provides a method and a system for correcting SOH of an electric vehicle. The problem of inaccurate SOH estimated value of current electric automobile is solved, security and the intellectuality that electric automobile used can be improved.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIG. 1: the invention provides a flow chart of an SOH correction method of an electric automobile.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problem that the SOH estimation value of the power battery of the conventional electric automobile is inaccurate, the invention provides the SOH correction method and the SOH correction system of the electric automobile. The problem of inaccurate SOH estimated value of current electric automobile is solved, security and the intellectuality that electric automobile used can be improved.
As shown in fig. 1, a method for correcting SOH of an electric vehicle includes:
s1: obtaining a corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests, and establishing an OCV-SOC corresponding table of the power battery;
s2: when the power battery is charged and discharged after being fully charged in a slow charging mode, the accumulated discharge capacity C of the battery is obtained1And the cumulative charging capacity C2；
S3: before the next time of full charge of the power battery, judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV;
s4: if yes, obtaining the open-circuit voltage OCV of the power battery, and obtaining the corresponding SOC through the OCV-SOC corresponding table lookupOCVCorrection value according to SOCOCVAnd correcting the SOH of the power battery by the correction value.
In practical application, the real SOH value of the battery at the moment can be calculated by counting the actual discharge capacity of the battery at the moment under different running states of different batteries and the same battery. And with the gradual attenuation of the battery, the SOH of the power battery is corrected according to the OCV corrected SOC value, so that the accuracy is improved.
The method further comprises the following steps:
s5: if not, accumulating the discharge capacity C according to the battery after the electric quantity of the vehicle is completely discharged1And the accumulated charging capacity C2And calculating to obtain the SOH of the power battery.
Further, the method is based on SOCOCVThe correction value is used for correcting the SOH of the power battery and comprises the following steps:
according to the formula:
calculating to obtain the actual capacity C of the power batteryS；
Obtaining rated capacity C of power batteryeAnd according to the formula:
obtaining a calculated value of SOH;
and correcting the calculated SOH value as the SOH of the power battery.
In practical application, a three-cell pure electric car of a certain type is taken as an example for explanation. After the vehicle is full, carrying out three discharging working conditions and two charging working conditions, then carrying out OCV correction, and correcting the SOC correction value SOC at the momentOCV18%, cumulative battery discharge capacity C174.56AH, cumulative charging capacity C215.88AH, the actual capacity of the battery at that time
And then can obtain according to the formula
Further, the accumulated discharge capacity C according to the battery1And the accumulated charging capacity C2Calculating the SOH of the power battery, comprising the following steps: according to the formula: cS＝C1-C2Calculating to obtain the actual capacity C of the power batteryS(ii) a And taking the ratio of the actual capacity to the rated capacity of the power battery as the SOH correction value of the power battery.
In practical application, a certain type of lithium iron battery pure electric car is taken as an example for explanation. After the vehicle is fully charged by self-slow charge, the OCV correction is not carried out until the electric quantity of the vehicle is completely emptied, and the accumulated discharge capacity C of the battery is counted164.37AH, cumulative charging capacity C27.68 AH; according to the formula, the following can be calculated: cS＝C2-C1＝64.37-7.68＝56.69AH，
The condition for judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV comprises the following steps: and whether the power battery of the vehicle is kept in a static state for more than or equal to 1h, and if so, the collected lowest voltage of the battery cells is taken as the open-circuit voltage OCV of the power battery.
Specifically, according to the electrochemical characteristics of the battery, the SOC value of the battery has a specific correspondence relationship with the open-circuit voltage OCV thereof, and thus an accurate SOC value thereof can be obtained by measuring the OCV of the battery; the OCV value is the lowest voltage of the single battery after the battery is kept in a standing state for more than or equal to 1h, and corresponds to the lowest voltage of the single battery collected at the moment when a vehicle is electrified again in the running process of an actual client, namely if the vehicle is stopped and the power is off for more than 1h, namely the OCV value of the battery; according to the value, the accurate SOC value SOC corrected by OCV can be obtained by looking up a tableOCV。
Therefore, the invention provides an SOH correction method of an electric vehicle, which comprises the steps of setting an OCV-SOC correspondence table, correcting the SOC value of a power battery through the OCV when the conditions are met, and further correcting the SOH of the power battery. The problem of inaccurate SOH estimated value of current electric automobile is solved, security and the intellectuality that electric automobile used can be improved.
The invention also provides an SOH correction system of an electric vehicle, comprising: and the setting unit is used for obtaining the corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests and establishing an OCV-SOC corresponding table of the power battery. An obtaining unit for obtaining the accumulated discharge capacity C of the battery when the power battery is charged and discharged after being fully charged in a slow charging mode1And the cumulative charging capacity C2. And the judging unit is used for judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV before the next full charge of the power battery. The first correction unit is used for acquiring the open-circuit voltage OCV of the power battery when the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV, and obtaining the corresponding SOC through the OCV-SOC corresponding tableOCVCorrection value according to SOCOCVAnd correcting the SOH of the power battery by the correction value.
The system further comprises: a second correcting unit for correcting the SOC of the power battery according to the accumulated discharge capacity C of the power battery when the power battery does not meet the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV and the vehicle is completely discharged1And the accumulated charging capacity C2And calculating to obtain the SOH of the power battery.
Further, the first correction unit includes: a first battery capacity calculation unit for calculating a battery capacity of the battery according to the formula:
calculating to obtain the actual capacity C of the power batteryS. A first SOH calculation unit for obtaining rated capacity C of the power batteryeAnd according to the formula:
obtaining a calculated value of SOH, and taking the calculated value of SOH as motionThe power cell SOH is corrected.
Further, the second correction unit includes: a second battery capacity calculation unit for calculating a second battery capacity according to the formula: cS＝C1-C2Calculating to obtain the actual capacity C of the power batteryS. And the second SOH calculation unit is used for taking the ratio of the actual capacity to the rated capacity of the power battery as the SOH correction value of the power battery.
The judging unit includes: and the standing judgment unit is used for judging whether the power battery of the vehicle is kept in a standing state for more than or equal to 1h, and if so, the collected lowest voltage of the battery cells is taken as the open-circuit voltage OCV of the power battery.
Therefore, the invention provides an SOH correction method and system for an electric vehicle. The problem of inaccurate SOH estimated value of current electric automobile is solved, security and the intellectuality that electric automobile used can be improved.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (8)
1. An SOH correction method for an electric vehicle, comprising:
obtaining a corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests, and establishing an OCV-SOC corresponding table of the power battery;
when the power battery is charged and discharged after being fully charged in a slow charging mode, the accumulated discharge capacity C of the battery is obtained1And the cumulative charging capacity C2；
Before the next time of full charge of the power battery, judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV;
if yes, obtaining the open-circuit voltage OCV of the power battery, and obtaining the corresponding SOC through the OCV-SOC corresponding table lookupOCVCorrection value according to SOCOCVCorrecting the SOH of the power battery by the correction value;
said according to SOCOCVThe correction value is used for correcting the SOH of the power battery and comprises the following steps:
according to the formula:
calculating to obtain the actual capacity C of the power batteryS；
Obtaining rated capacity C of power batteryeAnd according to the formula:
obtaining a calculated value of SOH;
and correcting the calculated SOH value as the SOH of the power battery.
2. The SOH correction method for an electric vehicle according to claim 1, further comprising:
if not, accumulating the discharge capacity C according to the battery after the electric quantity of the vehicle is completely discharged1And the accumulated charging capacity C2And calculating to obtain the SOH of the power battery.
3. The SOH correction method for electric vehicle according to claim 2, wherein said battery accumulates discharge capacity C1And the accumulated charging capacity C2Calculating the SOH of the power battery, comprising the following steps:
when the condition that the open-circuit voltage OCV is adopted to correct the SOC of the power battery is not met, according to the formula: cS＝C1-C2Calculating to obtain the actual capacity C of the power batteryS；
And taking the ratio of the actual capacity to the rated capacity of the power battery as the SOH correction value of the power battery.
4. The SOH correction method of an electric vehicle according to claim 1, wherein determining whether the power battery satisfies a condition for correcting the SOC of the power battery using the open-circuit voltage OCV includes:
and whether the power battery of the vehicle is kept in a static state for more than or equal to 1h, and if so, the collected lowest voltage of the battery cells is taken as the open-circuit voltage OCV of the power battery.
5. An SOH correction system of an electric vehicle, comprising:
the setting unit is used for obtaining a corresponding relation between the open-circuit voltage OCV of the vehicle power battery and the SOC of the power battery through tests and establishing an OCV-SOC corresponding table of the power battery;
an obtaining unit for obtaining the accumulated discharge capacity C of the battery when the power battery is charged and discharged after being fully charged in a slow charging mode1And the cumulative charging capacity C2；
The judging unit is used for judging whether the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV or not before the next full charge of the power battery;
the first correction unit is used for acquiring the open-circuit voltage OCV of the power battery when the power battery meets the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV, and obtaining the corresponding SOC through the OCV-SOC corresponding tableOCVCorrection value according to SOCOCVCorrecting the SOH of the power battery by the correction value;
the first correction unit includes:
a first battery capacity calculation unit for calculating a battery capacity of the battery according to the formula:
calculating to obtain the actual capacity C of the power batteryS；
A first SOH calculation unit for obtaining rated capacity C of the power batteryeAnd according to the formula:
and obtaining a calculated SOH value, and correcting the calculated SOH value as the SOH of the power battery.
6. The SOH correction system for electric vehicle according to claim 5, further comprising:
a second correcting unit for correcting the SOC of the power battery according to the accumulated discharge capacity C of the power battery when the power battery does not meet the condition of correcting the SOC of the power battery by adopting the open-circuit voltage OCV and the vehicle is completely discharged1And the accumulated charging capacity C2And calculating to obtain the SOH of the power battery.
7. The SOH correction system of an electric vehicle according to claim 6, wherein the second correction unit comprises:
a second battery capacity calculation unit for, when a condition for correcting the SOC of the power battery using the open-circuit voltage OCV is not satisfied, calculating a second battery capacity according to the formula: cS＝C1-C2Calculating to obtain the actual capacity C of the power batteryS；
And the second SOH calculation unit is used for taking the ratio of the actual capacity to the rated capacity of the power battery as the SOH correction value of the power battery.
8. The SOH correction method for an electric vehicle according to claim 5, wherein the determination unit includes:
and the standing judgment unit is used for judging whether the power battery of the vehicle is kept in a standing state for more than or equal to 1h, and if so, the collected lowest voltage of the battery cells is taken as the open-circuit voltage OCV of the power battery.
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| CN110988690B (en) * | 2019-04-25 | 2021-03-09 | 宁德时代新能源科技股份有限公司 | Battery state of health correction method, device, management system and storage medium |
| CN110058177B (en) * | 2019-05-06 | 2021-08-31 | 奇瑞新能源汽车股份有限公司 | Power battery electric quantity SOC correction method |
| CN110133532A (en) * | 2019-05-29 | 2019-08-16 | 东北电力大学 | A kind of health status calculation method based on battery open circuit voltage |
| CN110967647B (en) | 2019-06-24 | 2020-11-17 | 宁德时代新能源科技股份有限公司 | Charge state correction method and device |
| CN110376527B (en) * | 2019-07-11 | 2021-10-01 | 奇瑞新能源汽车股份有限公司 | Estimation method for SOH (state of health) of power battery and electric vehicle |
| CN111308374A (en) * | 2019-10-15 | 2020-06-19 | 江西恒动新能源有限公司 | Estimation method for SOH value of battery pack state of health |
| CN112782601A (en) * | 2019-11-05 | 2021-05-11 | 奥动新能源汽车科技有限公司 | Method, system and equipment for acquiring health degree of battery and readable storage medium |
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| CN111426973A (en) * | 2020-04-26 | 2020-07-17 | 特瓦特能源科技有限公司 | Battery health state detection method and device |
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