CN107121642B - SOH coefficient adjusting method and device for power battery - Google Patents
SOH coefficient adjusting method and device for power battery Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
The invention provides a method and a device for adjusting an SOH coefficient of a power battery, wherein the method comprises the following steps: discharging the power battery to be adjusted; acquiring discharge data of the power battery in a discharge process; judging whether the current SOH coefficient of the power battery is adjusted or not according to the discharge data; when the current SOH coefficient is judged to be required to be adjusted, an adjustment strategy is obtained; and in the next charging process, adjusting the current SOH coefficient by using an adjusting strategy to obtain the target SOH coefficient of the power battery. According to the method, whether the current SOH coefficient is adjusted or not is judged according to the discharge data in the discharge process, if the current SOH coefficient is required to be adjusted, an adjustment strategy is obtained, and the SOH coefficient is adjusted according to the obtained adjustment strategy in the next charging process, so that the SOH coefficient is judged and adjusted in real time in the using process of the power battery, and the accuracy of the estimated SOH coefficient is improved.
Description
Technical Field
The invention relates to the field of vehicle engineering, in particular to a method and a device for adjusting an SOH coefficient of a power battery.
Background
As the service life of the power battery increases, the capacity and power performance of the power battery show a tendency to decline. Under the condition that the service life of the power battery is reduced, if the State of Health (SOH) coefficient cannot be accurately estimated, the evaluation of the capacity and the power performance of the power battery is inevitably influenced, so that the performance and the use reliability of the battery are reduced, and even an overload use condition occurs, and a dangerous accident occurs.
The current methods for estimating the SOH coefficient mainly comprise two methods, one is to estimate the SOH coefficient by estimating the internal resistance of the battery; the other method is to calculate the SOH coefficient by counting the accumulated charging capacity and the accumulated discharging capacity of the battery pack.
However, during the actual use of the power battery, the estimation error of the internal resistance of the battery is large, so that the error of the estimated SOH coefficient is also large. Meanwhile, the SOH coefficient is calculated according to the difference of the accumulated charge capacity and the accumulated discharge capacity, a large amount of data is needed for supporting, the problem of difference among batteries cannot be solved, and the real-time evaluation of the power battery is lacked. Therefore, the existing method for estimating the SOH coefficient has the problems of large error and poor real-time property.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a method for adjusting an SOH coefficient of a power battery, which determines whether to adjust a current SOH coefficient according to discharge data obtained in a discharging process, and if so, obtains an adjustment strategy, and adjusts the current SOH coefficient according to the obtained adjustment strategy in a next charging process, so as to determine and adjust the SOH coefficient in real time during a using process of the power battery, so as to solve problems of large error and poor real-time performance of an existing method for estimating the SOH coefficient.
The second purpose of the invention is to provide an SOH coefficient adjusting device of a power battery.
The third purpose of the invention is to provide another SOH coefficient adjusting device of the power battery.
A fourth object of the invention is to propose a computer program product.
A fifth object of the invention is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for adjusting an SOH coefficient of a power battery, including: discharging the power battery to be adjusted; acquiring discharge data of the power battery in a discharge process; judging whether the current SOH coefficient of the power battery is adjusted or not according to the discharge data; when the current SOH coefficient is judged to be required to be adjusted, an adjustment strategy is obtained; and in the next charging process, adjusting the current SOH coefficient by using an adjusting strategy to obtain the target SOH coefficient of the power battery.
As an optional implementation manner of the embodiment of the first aspect, acquiring discharge data of the power battery in a discharge process includes: recording the lowest discharge voltage of each battery monomer in the power battery in the discharge process; acquiring the current accumulated discharge capacity of the power battery; and acquiring the state of charge of the power battery.
As an optional implementation manner of the embodiment of the first aspect, the determining whether to adjust the current SOH coefficient of the power battery according to the discharge data includes:
judging whether a first battery monomer exists in all the battery monomers or not according to the lowest discharge voltage of each battery monomer in the discharge data, wherein the lowest discharge voltage of the first battery monomer is less than or equal to the discharge cut-off voltage of the power battery;
if the first battery monomer is judged to exist, determining that the current SOH coefficient needs to be adjusted;
obtaining an adjustment strategy, comprising: if the first battery monomer exists in all the battery monomers, a first adjustment strategy for adjusting the current SOH coefficient is obtained;
in the next charging process, the current SOH coefficient is adjusted by using an adjusting strategy to obtain a target SOH coefficient of the power battery, and the method comprises the following steps: reducing the current SOH coefficient according to a preset adjusting value to obtain a target SOH coefficient; and clearing the current accumulated discharge capacity.
As an optional implementation manner of the embodiment of the first aspect, if it is determined that the first battery cell does not exist, it is determined whether a current accumulated discharge capacity in the discharge data is greater than or equal to a preset capacity threshold and a state of charge in the discharge data is less than a preset state threshold;
if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, determining that the current SOH coefficient needs to be adjusted;
obtaining an adjustment strategy, comprising: a second adjustment strategy for adjusting the current SOH coefficient if the current accumulated discharge capacity is greater than or equal to the capacity threshold and the state of charge is less than the state threshold;
in the next charging process, the current SOH coefficient is adjusted by using an adjusting strategy to obtain a target SOH coefficient of the power battery, and the method comprises the following steps: according to a preset adjusting value, the current SOH coefficient is improved to obtain a target SOH coefficient; and clearing the current accumulated discharge capacity.
As an optional implementation manner of the embodiment of the first aspect, after determining that the current SOH coefficient needs to be adjusted if it is determined that the first battery cell exists, the method further includes: marking the current SOH coefficient by using a preset first numerical value;
obtaining an adjustment strategy, comprising: and finding the first adjustment strategy according to the first numerical value.
As an optional implementation manner of the embodiment of the first aspect, if the current accumulated discharge capacity is greater than or equal to the capacity threshold and the state of charge is less than the state threshold, after determining that the current SOH coefficient needs to be adjusted, the method further includes: marking the current SOH coefficient by using a preset second numerical value;
obtaining an adjustment strategy, comprising: and finding a second adjustment strategy according to the second numerical value.
As an optional implementation manner of the embodiment of the first aspect, if it is determined that the current accumulated discharge capacity is smaller than the capacity threshold or the state of charge is greater than or equal to the state threshold, it is determined that the current SOH coefficient does not need to be adjusted; marking the current SOH coefficient by using a preset third numerical value; the current SOH coefficient and the current accumulated discharge capacity are maintained.
As an optional implementation manner of the embodiment of the first aspect, the power battery is cyclically charged and discharged according to preset times, and a mapping relation between accumulated discharge capacity and SOH coefficient is obtained; when the power battery to be adjusted is discharged for the first time, acquiring the accumulated discharge capacity of a vehicle where the power battery is located; and inquiring the mapping relation according to the accumulated discharge capacity to obtain the initial SOH coefficient of the power battery.
The method for adjusting the SOH coefficient of the power battery comprises the steps of discharging the power battery to be adjusted, obtaining discharge data of the power battery in the discharging process, judging whether the current SOH coefficient of the power battery needs to be adjusted or not according to the discharge data, obtaining an adjusting strategy when the current SOH coefficient needs to be adjusted, and adjusting the current SOH coefficient by using the obtained adjusting strategy in the next charging process to obtain the target SOH coefficient of the power battery. In the embodiment, whether the current SOH coefficient is adjusted or not is judged according to the discharge data in the discharge process, if the current SOH coefficient is required to be adjusted, the adjustment strategy is obtained, the SOH coefficient is adjusted according to the adjustment strategy in the next charging process, the target SOH coefficient is obtained, the fact that the SOH coefficient is judged and adjusted in real time in the using process of the power battery is achieved, the accuracy of the estimated SOH coefficient is improved, and the problems that the existing method for estimating the SOH coefficient is large in error and poor in real-time performance are solved.
In order to achieve the above object, a second aspect of the present invention provides an SOH coefficient adjustment device for a power battery, including: the discharging module is used for discharging the power battery to be adjusted; the first acquisition module is used for acquiring discharge data of the power battery in the discharge process; the judging module is used for judging whether the current SOH coefficient of the power battery is adjusted or not according to the discharging data; the second acquisition module is used for acquiring an adjustment strategy when the current SOH coefficient is judged to be required to be adjusted; and the adjusting module is used for adjusting the current SOH coefficient by using an adjusting strategy in the next charging process to obtain the target SOH coefficient of the power battery.
As an optional implementation manner of the second aspect, the first obtaining module is specifically configured to: recording the lowest discharge voltage of each battery monomer in the power battery in the discharge process; acquiring the current accumulated discharge capacity of the power battery; and acquiring the state of charge of the power battery.
As an optional implementation manner of the embodiment of the second aspect, the determining module is specifically configured to: judging whether a first battery monomer exists in all the battery monomers or not according to the lowest discharge voltage of each battery monomer in the discharge data, wherein the lowest discharge voltage of the first battery monomer is less than or equal to the discharge cut-off voltage of the power battery; if the first battery monomer is judged to exist, determining that the current SOH coefficient needs to be adjusted;
the second obtaining module is specifically configured to: if the first battery monomer exists in all the battery monomers, a first adjustment strategy for adjusting the current SOH coefficient is obtained;
the adjustment module is specifically configured to: reducing the current SOH coefficient according to a preset adjusting value to obtain a target SOH coefficient; and clearing the current accumulated discharge capacity.
As an optional implementation manner of the embodiment of the second aspect, the determining module is specifically configured to: if the first battery monomer does not exist, judging whether the current accumulated discharge capacity in the discharge data is larger than or equal to a preset capacity threshold value and whether the charge state in the discharge data is smaller than a preset state threshold value; if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, determining that the current SOH coefficient needs to be adjusted;
the second obtaining module is specifically configured to: a second adjustment strategy for adjusting the current SOH coefficient if the current accumulated discharge capacity is greater than or equal to the capacity threshold and the state of charge is less than the state threshold;
the adjustment module is specifically configured to: according to a preset adjusting value, the current SOH coefficient is improved to obtain a target SOH coefficient; and clearing the current accumulated discharge capacity.
As an optional implementation manner of the embodiment of the second aspect, the apparatus further includes: the marking module is used for marking the current SOH coefficient by utilizing a preset first numerical value; the second obtaining module is further configured to find the first adjustment policy according to the first numerical value.
As an optional implementation manner of the embodiment of the second aspect, the marking module is further configured to mark the current SOH coefficient by using a preset second numerical value; and the second obtaining module is also used for finding the second adjustment strategy according to the second numerical value.
As an optional implementation manner of the embodiment of the second aspect, the determining module is further configured to: if the current accumulated discharge capacity is smaller than the capacity threshold or the state of charge is larger than or equal to the state threshold, judging that the current SOH coefficient does not need to be adjusted; the marking module is also used for marking the current SOH coefficient by using a preset third numerical value; and the adjusting module is also used for maintaining the current SOH coefficient and the current accumulated discharge capacity.
As an optional implementation manner of the embodiment of the second aspect, the first obtaining module is further configured to: carrying out cyclic charge and discharge on the power battery according to preset times to obtain a mapping relation between the accumulated discharge capacity and the SOH coefficient; when the power battery to be adjusted is discharged for the first time, acquiring the accumulated discharge capacity of a vehicle where the power battery is located; and inquiring the mapping relation according to the accumulated discharge capacity to obtain the initial SOH coefficient of the power battery.
The SOH coefficient adjusting device for the power battery, provided by the embodiment of the invention, discharges the power battery to be adjusted, acquires the discharge data of the power battery in the discharge process, judges whether the current SOH coefficient of the power battery needs to be adjusted or not according to the discharge data, acquires an adjusting strategy when the current SOH coefficient needs to be adjusted, and adjusts the current SOH coefficient by using the acquired adjusting strategy in the next charging process to obtain the target SOH coefficient of the power battery. In the embodiment, whether the current SOH coefficient is adjusted or not is judged according to the discharge data in the discharge process, if the current SOH coefficient is required to be adjusted, the adjustment strategy is obtained, the SOH coefficient is adjusted according to the adjustment strategy in the next charging process, the target SOH coefficient is obtained, the fact that the SOH coefficient is judged and adjusted in real time in the using process of the power battery is achieved, the accuracy of the estimated SOH coefficient is improved, and the problems that the existing method for estimating the SOH coefficient is large in error and poor in real-time performance are solved.
In order to achieve the above object, a third embodiment of the present invention provides another SOH coefficient adjustment device for a power battery, including a memory and a processor, where the processor executes a program corresponding to an executable program code by reading the executable program code stored in the memory, so as to perform the SOH coefficient adjustment method for a power battery according to the first embodiment.
To achieve the above object, a fourth aspect of the present invention provides a computer program product, wherein when instructions in the computer program product are executed by a processor, the method for adjusting the SOH coefficient of a power battery according to the first aspect is performed.
To achieve the above object, a fifth embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the SOH coefficient adjustment method for a power battery according to the first embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a method for adjusting an SOH coefficient of a power battery according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a specific method for adjusting the SOH coefficient of a power battery according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an SOH coefficient adjustment device of a power battery according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another SOH coefficient adjustment device for a power battery according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The SOH coefficient adjustment method and apparatus for a power battery according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As the service life of the power battery increases, the capacity and power performance of the power battery show a tendency to decline. Under the condition that the service life of the power battery is reduced, if the SOH coefficient of the power battery cannot be accurately estimated, the evaluation of the capacity and the power performance of the power battery is inevitably influenced, so that the performance and the use reliability of the battery are reduced, and even an overload use condition occurs, and a dangerous accident occurs.
The current methods for estimating the SOH coefficient mainly comprise two methods, one is to estimate the SOH coefficient by estimating the internal resistance of the battery; the other method is to calculate the SOH coefficient by counting the accumulated charging capacity and the accumulated discharging capacity of the battery pack.
However, during the actual use of the power battery, the estimation error of the internal resistance of the battery is large, so that the error of the estimated SOH coefficient is also large. Meanwhile, the SOH coefficient is calculated according to the difference of the accumulated charge capacity and the accumulated discharge capacity, a large amount of data is needed for supporting, the problem of difference among batteries cannot be solved, and the real-time evaluation of the power battery is lacked. Therefore, the existing method for estimating the SOH coefficient has the problems of large error and poor real-time property.
Aiming at the problem, the invention provides an SOH coefficient adjusting method of a power battery, which judges whether the current SOH coefficient is adjusted or not according to the obtained discharge data in the discharge process, if the current SOH coefficient is required to be adjusted, an adjusting strategy is obtained, the current SOH coefficient is adjusted according to the obtained adjusting strategy in the next charging process, and the SOH coefficient is judged and adjusted in real time in the using process of the power battery.
Fig. 1 is a schematic flow chart of a method for adjusting an SOH coefficient of a power battery according to an embodiment of the present invention.
As shown in fig. 1, the method for adjusting the SOH coefficient of the power battery includes:
and S101, discharging the power battery to be adjusted.
For example, an electric vehicle is equipped with a power battery, and when the electric vehicle is started, the power battery is discharged.
And S102, acquiring discharge data of the power battery in the discharge process.
The discharging data includes the lowest discharging voltage of each battery cell, the current accumulated discharging capacity of the power battery, the State of Charge (SOC) of the battery, and the like. The SOC is also called a remaining capacity, and represents a ratio of a remaining capacity of the battery after being used for a certain period of time or left unused for a long time to a fully charged capacity thereof, and may be expressed as a percentage.
In this embodiment, when the power battery is discharged, the lowest discharge voltage of each battery cell in the power battery during the discharge process is recorded. Meanwhile, the current accumulated discharge capacity of the power battery is obtained, namely the accumulated discharge capacity of the power battery from the first discharge to the present. In this embodiment, after each discharge is completed, the current discharge capacity may be added to the accumulated discharge capacity before the current discharge, so as to obtain the accumulated discharge capacity of the power battery after the current discharge is completed.
In the discharging process, the SOC of the power battery needs to be acquired while acquiring the lowest discharging voltage of each battery cell and the current accumulated discharging capacity of the power battery.
And S103, judging whether the current SOH coefficient of the power battery is adjusted or not according to the discharge data.
In this embodiment, whether the first battery cell exists in all the batteries is determined according to the lowest discharge voltage of each battery cell in the discharge data. The lowest discharge voltage of the first battery cell is less than or equal to the discharge cut-off voltage of the power battery.
If the first battery cell exists, that is, as long as the battery cells exist in all the batteries, the lowest discharge voltage of the first battery cell is less than or equal to the discharge cut-off voltage, the current SOH coefficient needs to be adjusted. In order to facilitate searching for the corresponding adjustment strategy, the current SOH coefficient may be marked with a preset first value, for example, marked with a number "1", and the corresponding adjustment strategy is searched for by the first value.
And if the first battery cell does not exist, judging whether the current accumulated discharge capacity in the discharge data is greater than or equal to a preset capacity threshold value and the SOC in the discharge data is smaller than a preset state threshold value.
And if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the SOC is smaller than the state threshold, judging that the current SOH coefficient needs to be adjusted, and marking the current SOH coefficient by using a preset second number.
And if the current accumulated discharge capacity is smaller than the capacity threshold or the SOC is larger than or equal to the state threshold, judging that the current SOH coefficient does not need to be adjusted, and marking the current SOH coefficient by using a preset third value so as to search a corresponding adjustment strategy according to the third value.
And S104, acquiring an adjustment strategy when the current SOH coefficient needs to be adjusted.
In this embodiment, if a first battery cell exists in the battery cells, a first adjustment strategy for adjusting the current SOH coefficient is obtained. In this embodiment, when a first battery cell exists in the battery cells, the current SOH coefficient may be marked as a first numerical value, so that a corresponding first adjustment strategy may be searched through the first numerical value, and a first adjustment strategy for adjusting the current SOH coefficient is further obtained.
If the first battery cell does not exist in all the battery cells, the current accumulated discharge capacity is larger than or equal to the capacity threshold value, and the SOC is smaller than the state threshold value, the current SOH coefficient is marked as a second numerical value, so that a corresponding second adjustment strategy can be searched according to the second numerical value, and the second adjustment strategy of the current SOH coefficient is obtained.
And if the current accumulated discharge capacity is smaller than the capacity threshold or the SOC is larger than or equal to the state threshold, marking the current SOH coefficient as a third numerical value, and searching a corresponding strategy according to the third numerical value.
In this embodiment, the SOH coefficient is marked by using a numerical value, and the corresponding adjustment strategy can be obtained by searching for the mark of the SOH coefficient.
And S105, in the next charging process, adjusting the current SOH coefficient by using an adjusting strategy to obtain the target SOH coefficient of the power battery.
In this embodiment, if it is determined that the current SOH coefficient of the power battery needs to be adjusted by the first adjustment strategy according to the discharge data, the current SOH coefficient is reduced according to a preset adjustment value in the next charging process of the power battery to obtain a target SOH coefficient, and the current accumulated discharge capacity is cleared. The preset adjustment value may be selected according to the characteristics and requirements of the battery, and is preferably [0.001,0.01 ].
And if the current SOH coefficient of the power battery is judged to be required to be adjusted by the second adjustment strategy, the current SOH coefficient is increased according to a preset adjustment value in the next process of charging the power battery to obtain a target SOH coefficient, and the current accumulated discharge capacity is cleared.
If the current accumulated discharge capacity is smaller than the capacity threshold or the SOC is larger than or equal to the state threshold, the current SOH coefficient does not need to be adjusted in the process of charging the power battery next time, and the current SOH coefficient and the current accumulated discharge capacity are maintained.
In the embodiment, whether the current SOH coefficient is adjusted or not is judged according to the discharge data in the last discharge process, if the current SOH coefficient is required to be adjusted, the corresponding adjustment strategy is obtained, and the current SOH coefficient of the power battery is adjusted according to the corresponding adjustment strategy in the next charging process, so that the SOH coefficient is continuously adjusted in the using process of the power battery, and the accuracy of the SOH coefficient is improved.
The following describes a method for adjusting the SOH coefficient of a power battery according to an embodiment of the present invention.
As shown in fig. 2, the method includes:
s201, in the primary discharging process of the electric automobile, discharging data are obtained.
At a certain moment, the electric automobile is started, the power battery starts to discharge, and discharge data in the current discharge process, such as the lowest discharge voltage of each battery cell, the current accumulated discharge capacity of the power battery, the SOC and the like, are acquired.
S202, whether a first battery cell exists or not is judged.
And judging whether the battery cells exist in all the batteries or not according to the obtained lowest discharge voltage of each battery cell, wherein the lowest discharge voltage is less than or equal to the discharge cut-off voltage of the power battery.
If the first battery cell exists, step S203 is executed to mark the SOH coefficient as 1. Otherwise, step S204 is executed.
And S204, judging whether the accumulated discharge capacity is more than or equal to the nominal capacity of the battery pack by 10 and the SOC is less than 5 percent.
If the accumulated discharge capacity is greater than or equal to the nominal capacity of the battery pack by 10 and the SOC is less than 5%, step S205 is executed to mark the SOH coefficient as 2. Otherwise, step S206 is executed to mark the SOH coefficient as 0.
And S207, next charging process.
And when the power battery of the electric automobile is discharged, charging the power battery.
S208, judging whether the mark of the SOH coefficient is equal to 1.
In the next charging process, if the flag of the SOH coefficient is equal to 1, step S209 is performed. Otherwise, step S210 is performed.
S209, SOH _ now is SOH _ last- Δ SOH, and the cumulative discharge capacity is 0.
Wherein, SOH _ last represents the current SOH coefficient, Δ SOH represents the preset adjustment value, and SOH _ now represents the adjusted SOH coefficient. The cumulative discharge capacity is zero when 0.
When the flag of the SOH coefficient is equal to 1, the current coefficient SOH _ last is reduced according to the formula SOH _ now ═ SOH _ last- Δ SOH, and the accumulated discharge capacity is cleared.
When the power battery to be adjusted is discharged for the first time, the initial SOH coefficient of the power battery needs to be acquired. In this embodiment, the power battery may be charged and discharged in advance according to preset times, and during the cyclic charging and discharging, the accumulated discharge capacity of the power battery is obtained to establish a mapping relationship between the accumulated discharge capacity and the SOH coefficient.
For example, in a specified charging and discharging interval, the power battery is subjected to 1C charging-1C discharging (1 hour charging is completed and 1 hour discharging is completed), and the SOH coefficient can be calibrated once every 100 cycles, so that the mapping relation between the accumulated discharging capacity and the SOH coefficient of the power battery in the whole life cycle can be obtained.
In this embodiment, when a power battery to be adjusted on a vehicle is discharged for the first time, the accumulated discharge capacity of the vehicle where the power battery is located is obtained, and then the initial SOH coefficient of the power battery is obtained by querying the mapping relationship between the accumulated discharge capacity and the SOH coefficient according to the accumulated discharge capacity of the vehicle.
For example, if the vehicle is a new vehicle, the cumulative discharge capacity of the vehicle in which the power battery is located is generally 0, and the SOH coefficient is obtained as a default value from the mapping relationship between the cumulative discharge capacity and the SOH coefficient. If the old power battery on the vehicle is replaced by the new power battery, the accumulated discharge capacity required to be obtained is the accumulated discharge capacity of the vehicle, but not the accumulated discharge capacity of the new power battery, so that the initial SOH coefficient of the power battery is obtained by inquiring the mapping relation between the accumulated discharge capacity and the SOH coefficient according to the accumulated discharge capacity of the vehicle where the power battery is located.
S210, judging whether the mark of the SOH coefficient is equal to 2.
If the flag of the SOH coefficient is equal to 2, step S211 is performed. Otherwise, the mark of the SOH coefficient is 0, and step S212 is executed.
S211, SOH _ now is SOH _ last + Δ SOH, and the cumulative discharge capacity is 0.
When the mark of the SOH coefficient is 2, according to the formula SOH _ now ═ SOH _ last + Δ SOH, the current SOH coefficient SOH _ last is lifted, and the accumulated discharge capacity is cleared.
S212，SOH_now＝SOH_last。
When the mark of the SOH coefficient is 0, the SOH coefficient is kept unchanged, and the accumulated discharge capacity is not cleared.
And S213, ending the charging.
After the power battery on the electric vehicle is charged, when the power battery is discharged next time, step S201 is executed to continue determining and adjusting the SOH coefficient.
In this embodiment, during each discharging process of the power battery, discharging data is obtained, whether the current SOH coefficient is adjusted is judged according to the discharging data, the SOH coefficient is marked according to the judgment result, and during the next charging process of the power battery, a corresponding adjustment strategy is selected according to the marking of the SOH coefficient to adjust the SOH coefficient. Therefore, the SOH coefficient is continuously adjusted in the using process of the power battery, and the accuracy of the SOH coefficient is improved.
The method for adjusting the SOH coefficient of the power battery comprises the steps of discharging the power battery to be adjusted, obtaining discharge data of the power battery in the discharging process, judging whether the current SOH coefficient of the power battery needs to be adjusted or not according to the discharge data, obtaining an adjusting strategy when the current SOH coefficient needs to be adjusted, and adjusting the current SOH coefficient by using the obtained adjusting strategy in the next charging process to obtain the target SOH coefficient of the power battery. In the embodiment, whether the current SOH coefficient is adjusted or not is judged according to the discharge data in the discharge process, if the current SOH coefficient is required to be adjusted, the adjustment strategy is obtained, the SOH coefficient is adjusted according to the adjustment strategy in the next charging process, the target SOH coefficient is obtained, the fact that the SOH coefficient is judged and adjusted in real time in the using process of the power battery is achieved, the accuracy of the estimated SOH coefficient is improved, and the problems that the existing method for estimating the SOH coefficient is large in error and poor in real-time performance are solved.
In order to achieve the above purpose, the invention further provides a device for adjusting the SOH coefficient of the power battery.
As shown in fig. 3, the apparatus includes: the system comprises a discharging module 310, a first obtaining module 320, a judging module 330, a second obtaining module 340 and an adjusting module 350.
The discharging module 310 is used for discharging the power battery to be adjusted.
The first obtaining module 320 is configured to obtain discharge data of the power battery during a discharge process.
The determining module 330 is configured to determine whether to adjust the current SOH coefficient of the power battery according to the discharging data.
The second obtaining module 340 is configured to obtain an adjustment policy when it is determined that the current SOH coefficient needs to be adjusted.
The adjusting module 350 is configured to adjust the current SOH coefficient by using an adjusting strategy in the next charging process to obtain a target SOH coefficient of the power battery.
In a possible implementation manner of the present invention, the first obtaining module 320 is specifically configured to record a lowest discharge voltage of each battery cell in the power battery during a discharge process; acquiring the current accumulated discharge capacity of the power battery; and acquiring the state of charge of the power battery.
The determining module 330 is specifically configured to determine whether a first battery cell exists in all the battery cells according to the lowest discharge voltage of each battery cell in the discharge data, where the lowest discharge voltage of the first battery cell is less than or equal to the discharge cutoff voltage of the power battery; and if the first battery cell is judged to exist, determining that the current SOH coefficient needs to be adjusted.
The second obtaining module 340 is specifically configured to obtain a first adjustment strategy for adjusting the current SOH coefficient if a first battery cell exists in all the battery cells.
The adjusting module 350 is specifically configured to reduce the current SOH coefficient according to a preset adjusting value to obtain a target SOH coefficient; and clearing the current accumulated discharge capacity.
In a possible implementation manner of the present invention, the determining module 330 is specifically configured to:
if the first battery monomer does not exist, judging whether the current accumulated discharge capacity in the discharge data is larger than or equal to a preset capacity threshold value and whether the charge state in the discharge data is smaller than a preset state threshold value; and if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, determining that the current SOH coefficient needs to be adjusted.
The second obtaining module 340 is specifically configured to: and a second adjustment strategy for adjusting the current SOH coefficient if the current accumulated discharge capacity is greater than or equal to the capacity threshold and the state of charge is less than the state threshold.
The adjusting module 350 is specifically configured to increase the current SOH coefficient according to a preset adjusting value to obtain a target SOH coefficient; and clearing the current accumulated discharge capacity.
In a possible implementation manner of the present invention, as shown in fig. 4, the apparatus further includes: a marking module 360.
The marking module 360 is configured to mark the current SOH coefficient with a preset first value.
The second obtaining module 340 is further configured to find the first adjustment policy according to the first value.
The marking module 360 is further configured to mark the current SOH coefficient with a preset second value.
The second obtaining module 340 is further configured to find a second adjustment policy according to the second value.
In a possible implementation manner of the present invention, the determining module 330 is further configured to: and if the current accumulated discharge capacity is smaller than the capacity threshold or the state of charge is larger than or equal to the state threshold, judging that the current SOH coefficient does not need to be adjusted.
The marking module 360 is further configured to mark the current SOH coefficient with a preset third value.
The adjustment module 350 is also used to maintain the current SOH coefficient and the current accumulated discharge capacity.
In a possible implementation manner of the present invention, the first obtaining module 320 is further configured to perform cyclic charge and discharge on the power battery according to preset times, so as to obtain a mapping relationship between the accumulated discharge capacity and the SOH coefficient; when the power battery to be adjusted is discharged for the first time, acquiring the accumulated discharge capacity of a vehicle where the power battery is located; and inquiring the mapping relation according to the accumulated discharge capacity to obtain the initial SOH coefficient of the power battery.
It should be noted that the foregoing explanation of the SOH coefficient adjustment method for a power battery is also applicable to the explanation of the SOH coefficient adjustment device for a power battery in this embodiment, and is not repeated herein.
The SOH coefficient adjusting device for the power battery, provided by the embodiment of the invention, discharges the power battery to be adjusted, acquires the discharge data of the power battery in the discharge process, judges whether the current SOH coefficient of the power battery needs to be adjusted or not according to the discharge data, acquires an adjusting strategy when the current SOH coefficient needs to be adjusted, and adjusts the current SOH coefficient by using the acquired adjusting strategy in the next charging process to obtain the target SOH coefficient of the power battery. In the embodiment, whether the current SOH coefficient is adjusted or not is judged according to the discharge data in the discharge process, if the current SOH coefficient is required to be adjusted, the adjustment strategy is obtained, the SOH coefficient is adjusted according to the adjustment strategy in the next charging process, the target SOH coefficient is obtained, the fact that the SOH coefficient is judged and adjusted in real time in the using process of the power battery is achieved, the accuracy of the estimated SOH coefficient is improved, and the problems that the existing method for estimating the SOH coefficient is large in error and poor in real-time performance are solved.
In order to achieve the above object, the present invention further provides an SOH coefficient adjustment device for a power battery, including a memory and a processor, wherein the processor executes a program corresponding to an executable program code by reading the executable program code stored in the memory, so as to perform the SOH coefficient adjustment method for a power battery according to the above embodiment.
To achieve the above object, the present invention further provides a computer program product, wherein when instructions in the computer program product are executed by a processor, the method for adjusting the SOH coefficient of a power battery according to the above embodiment is performed.
To achieve the above object, the present invention further proposes a non-transitory computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the SOH coefficient adjustment method of a power battery as described in the above embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (14)
1. A method for adjusting an SOH coefficient of a power battery is characterized by comprising the following steps:
discharging the power battery to be adjusted;
the method for acquiring the discharge data of the power battery in the discharge process comprises the following steps: recording the lowest discharge voltage of each battery cell in the power battery in the discharge process; acquiring the current accumulated discharge capacity of the power battery; acquiring the state of charge of the power battery;
judging whether the current SOH coefficient of the power battery is adjusted or not according to the discharge data;
when the current SOH coefficient is judged to be required to be adjusted, an adjustment strategy is obtained;
in the next charging process, the current SOH coefficient is adjusted by using the adjusting strategy to obtain a target SOH coefficient of the power battery;
the judging whether to adjust the current SOH coefficient of the power battery according to the discharge data comprises the following steps: judging whether a first battery monomer exists in all the battery monomers or not according to the lowest discharge voltage of each battery monomer in the discharge data, wherein the lowest discharge voltage of the first battery monomer is less than or equal to the discharge cut-off voltage of the power battery; if the first battery monomer is judged to exist, determining that the current SOH coefficient needs to be adjusted;
the obtaining of the adjustment strategy comprises:
if the first battery monomer exists in all the battery monomers, a first adjustment strategy for adjusting the current SOH coefficient is obtained;
in the next charging process, the current SOH coefficient is adjusted by using the adjustment strategy to obtain the target SOH coefficient of the power battery, and the method comprises the following steps: reducing the current SOH coefficient according to a preset adjusting value to obtain the target SOH coefficient; and clearing the current accumulated discharge capacity.
2. The method of claim 1, further comprising:
if the first battery cell does not exist, judging whether the current accumulated discharge capacity in the discharge data is greater than or equal to a preset capacity threshold value and whether the charge state in the discharge data is smaller than a preset state threshold value;
if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, determining that the current SOH coefficient needs to be adjusted;
the obtaining of the adjustment strategy comprises:
if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, acquiring a second adjustment strategy for adjusting the current SOH coefficient;
in the next charging process, the current SOH coefficient is adjusted by using the adjustment strategy to obtain the target SOH coefficient of the power battery, and the method comprises the following steps:
according to a preset adjusting value, improving the current SOH coefficient to obtain the target SOH coefficient;
and clearing the current accumulated discharge capacity.
3. The method of claim 2, wherein after determining that the current SOH coefficient needs to be adjusted if the first battery cell is determined to be present, the method further comprises:
marking the current SOH coefficient by using a preset first numerical value;
the obtaining of the adjustment strategy comprises:
and finding the first adjustment strategy according to the first numerical value.
4. The method of claim 3, wherein after determining that the current SOH coefficient needs to be adjusted if the current cumulative discharge capacity is greater than or equal to the capacity threshold and the state of charge is less than the state threshold, further comprising:
marking the current SOH coefficient by using a preset second numerical value;
the obtaining of the adjustment strategy comprises:
and finding the second adjustment strategy according to the second numerical value.
5. The method of claim 4, further comprising:
if the current accumulated discharge capacity is smaller than the capacity threshold or the state of charge is larger than or equal to the state threshold, judging that the current SOH coefficient does not need to be adjusted;
marking the current SOH coefficient by using a preset third numerical value;
the current SOH coefficient and the current accumulated discharge capacity are maintained.
6. The method of any one of claims 1-5, further comprising:
carrying out cyclic charge and discharge on the power battery according to preset times to obtain a mapping relation between the accumulated discharge capacity and the SOH coefficient;
when the power battery to be adjusted is discharged for the first time, acquiring the accumulated discharge capacity of a vehicle where the power battery is located;
and inquiring the mapping relation according to the accumulated discharge capacity to obtain the initial SOH coefficient of the power battery.
7. An SOH coefficient adjustment device for a power battery, comprising:
the discharging module is used for discharging the power battery to be adjusted;
the first acquisition module is used for acquiring discharge data of the power battery in a discharge process, and the first acquisition module is specifically used for: recording the lowest discharge voltage of each battery cell in the power battery in the discharge process; acquiring the current accumulated discharge capacity of the power battery; acquiring the state of charge of the power battery;
the judging module is used for judging whether the current SOH coefficient of the power battery is adjusted or not according to the discharging data;
the second acquisition module is used for acquiring an adjustment strategy when the current SOH coefficient is judged to be required to be adjusted;
the adjusting module is used for adjusting the current SOH coefficient by using the adjusting strategy in the next charging process to obtain a target SOH coefficient of the power battery;
the judgment module is specifically configured to: judging whether a first battery monomer exists in all the battery monomers or not according to the lowest discharge voltage of each battery monomer in the discharge data, wherein the lowest discharge voltage of the first battery monomer is less than or equal to the discharge cut-off voltage of the power battery; if the first battery monomer is judged to exist, determining that the current SOH coefficient needs to be adjusted;
the second obtaining module is specifically configured to: if the first battery monomer exists in all the battery monomers, a first adjustment strategy for adjusting the current SOH coefficient is obtained;
the adjusting module is specifically configured to: reducing the current SOH coefficient according to a preset adjusting value to obtain the target SOH coefficient; and clearing the current accumulated discharge capacity.
8. The apparatus of claim 7, wherein the determining module is specifically configured to:
if the first battery cell does not exist, judging whether the current accumulated discharge capacity in the discharge data is greater than or equal to a preset capacity threshold value and whether the charge state in the discharge data is smaller than a preset state threshold value;
if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, determining that the current SOH coefficient needs to be adjusted;
the second obtaining module is specifically configured to:
if the current accumulated discharge capacity is larger than or equal to the capacity threshold and the state of charge is smaller than the state threshold, acquiring a second adjustment strategy for adjusting the current SOH coefficient;
the adjusting module is specifically configured to:
according to a preset adjusting value, improving the current SOH coefficient to obtain the target SOH coefficient;
and clearing the current accumulated discharge capacity.
9. The apparatus of claim 8, further comprising:
the marking module is used for marking the current SOH coefficient by utilizing a preset first numerical value;
the second obtaining module is further configured to find the first adjustment policy according to the first numerical value.
10. The apparatus of claim 9, further comprising:
the marking module is also used for marking the current SOH coefficient by using a preset second numerical value;
the second obtaining module is further configured to find the second adjustment policy according to the second numerical value.
11. The apparatus of claim 10, wherein the determining module is further configured to:
if the current accumulated discharge capacity is smaller than the capacity threshold or the state of charge is larger than or equal to the state threshold, judging that the current SOH coefficient does not need to be adjusted;
the marking module is further used for marking the current SOH coefficient by using a preset third numerical value;
the adjusting module is further used for maintaining the current SOH coefficient and the current accumulated discharge capacity.
12. The apparatus according to any one of claims 7-11, wherein the first obtaining module is further configured to:
carrying out cyclic charge and discharge on the power battery according to preset times to obtain a mapping relation between the accumulated discharge capacity and the SOH coefficient;
when the power battery to be adjusted is discharged for the first time, acquiring the accumulated discharge capacity of a vehicle where the power battery is located;
and inquiring the mapping relation according to the accumulated discharge capacity to obtain the initial SOH coefficient of the power battery.
13. An SOH coefficient adjustment device of a power battery, characterized by comprising a memory and a processor, wherein the processor executes a program corresponding to an executable program code stored in the memory by reading the executable program code for performing the SOH coefficient adjustment method of a power battery according to any one of claims 1 to 6.
14. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the SOH coefficient adjustment method for a power battery according to any one of claims 1 to 6.
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| KR102634816B1 (en) * | 2017-12-21 | 2024-02-07 | 삼성전자주식회사 | An battery monitoring apparatus detecting charge balance of a battery and a method thereof |
| CN109888414B (en) * | 2018-12-20 | 2021-11-26 | 深圳云动未来科技有限公司 | Management method, device and system of power battery |
| CN110568375A (en) * | 2019-09-03 | 2019-12-13 | 昆山宝创新能源科技有限公司 | SOH (state of health) determination method and device for power battery |
| CN113253140B (en) * | 2021-07-16 | 2021-09-28 | 杭州科工电子科技有限公司 | Battery health state online estimation method |
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