CN117970158A - Method for determining battery state of health, vehicle and storage medium - Google Patents
Method for determining battery state of health, vehicle and storage medium Download PDFInfo
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- 230000036541 health Effects 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 82
- 238000004590 computer program Methods 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 abstract description 29
- 230000003862 health status Effects 0.000 description 11
- 230000006870 function Effects 0.000 description 7
- 238000012937 correction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
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- 230000032683 aging Effects 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The application provides a method for determining the state of health of a battery, a vehicle and a storage medium, belonging to the technical field of automobiles, wherein the method comprises the following steps: determining a target capacity interval of a battery to be tested; determining a first charge and discharge amount and a second charge and discharge amount of the battery to be measured according to the target capacity interval, wherein the first charge and discharge amount is the actual charge and discharge amount of the battery to be measured in the target capacity interval, and the second charge and discharge amount is the theoretical charge and discharge amount of the battery to be measured in the target capacity interval; and determining the first health state of the battery to be tested according to the first charge and discharge amount and the second charge and discharge amount. Through the scheme, the battery does not need to carry out a complete charge and discharge flow, and the health state of the battery can be determined by only selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
Description
Technical Field
The application belongs to the technical field of automobiles, and particularly relates to a method for determining a battery health state, a vehicle and a storage medium.
Background
With the development of automobile technology, new energy automobiles are becoming more popular. An electric vehicle or a hybrid vehicle is a representative of a new energy vehicle. The electric vehicle or the hybrid electric vehicle is provided with a battery, and the battery is continuously aged along with continuous charge and discharge cycles, and an index for judging the aging degree Of the battery is the State Of Health (SOH).
In the related art, the state of health of a battery can be estimated by the charge and discharge capacity of the battery. That is, the maximum charge/discharge capacity of the battery is obtained, and the state of health of the battery is represented by the ratio of the maximum charge/discharge capacity to the rated capacity of the battery.
In the above related art, since the battery is difficult to have a complete charge and discharge process in actual use, the obtained maximum charge and discharge capacity is inaccurate, resulting in inaccurate estimated battery health status.
Disclosure of Invention
The application aims to provide a method for determining the state of health of a battery, a vehicle and a storage medium, and aims to solve the problem that the traditional method for determining the state of health of the battery is inaccurate.
A first aspect of an embodiment of the present application provides a method for determining a state of health of a battery, the method comprising:
Determining a target capacity interval of a battery to be tested;
Determining a first charge and discharge amount and a second charge and discharge amount of the battery to be measured according to the target capacity interval, wherein the first charge and discharge amount is an actual charge and discharge amount of the battery to be measured in the target capacity interval, and the second charge and discharge amount is a theoretical charge and discharge amount of the battery to be measured in the target capacity interval;
and determining the first health state of the battery to be tested according to the first charge and discharge amount and the second charge and discharge amount.
In some embodiments, the target capacity interval is represented by a remaining capacity of the battery under test; the determining the target capacity interval of the battery to be tested comprises the following steps:
Determining a first residual capacity and a second residual capacity of the battery to be measured, wherein the first residual capacity and the second residual capacity are two residual capacities measured by the battery to be measured at different times;
And determining the difference value between the first residual electric quantity and the second residual electric quantity as a target capacity interval of the battery to be tested.
In some embodiments, the determining the first charge-discharge amount and the second charge-discharge amount of the battery to be measured according to the target capacity interval includes:
Counting the charge and discharge capacity of the battery to be tested when the residual capacity of the battery to be tested changes from the first residual capacity to the second residual capacity, and obtaining the first charge and discharge capacity;
determining the rated electric quantity of the battery to be tested;
And determining the product of the target capacity interval and the rated power as the second charging and discharging capacity.
In some embodiments, the determining the first remaining power and the second remaining power of the battery to be measured includes:
Determining a third residual capacity and a fourth residual capacity measured by the battery to be measured at different times;
and correcting the third residual electric quantity to obtain the first residual electric quantity, and correcting the fourth residual electric quantity to obtain the second residual electric quantity.
In some embodiments, the target capacity interval is defined by a charging voltage of the battery under test; the determining the target capacity interval of the battery to be tested comprises the following steps:
determining a first preset voltage and a second preset voltage, wherein the first preset voltage is an initial charging voltage of the battery to be tested, and the second preset voltage is an ending charging voltage of the battery to be tested;
And determining the difference value between the second preset voltage and the first preset voltage as a target capacity interval of the battery to be tested.
In some embodiments, the determining the first charge-discharge amount and the second charge-discharge amount of the battery to be measured according to the target capacity interval includes:
Before the battery to be tested leaves the factory, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting a first charging time;
determining the second charge and discharge amount according to the preset current and the first charge duration;
When a first health state needs to be determined, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting a second charging time period;
And determining the first charge and discharge amount according to the preset current and the second charge duration.
In some embodiments, the determining the first health state of the battery to be tested according to the first charge-discharge amount and the second charge-discharge amount includes:
And determining the ratio between the first charge and discharge amount and the second charge and discharge amount as a first health state of the battery to be tested.
In some embodiments, the method further comprises:
before the battery to be tested leaves the factory, starting from a preset initial charging voltage, charging the battery to be tested to obtain a first charging voltage of the battery to be tested after a preset charging time period;
When a first health state needs to be determined, starting from the initial charging voltage, charging the battery to be tested to obtain a second charging voltage of the battery to be tested after a preset charging time period;
determining a first difference between the first charging voltage and the initial charging voltage; and determining a second difference between the second charging voltage and the initial charging voltage;
Determining the ratio of the first difference value to the second difference value as a second health state of the battery to be tested;
and determining the health state of the battery to be tested according to the second health state and the first health state.
A second aspect of an embodiment of the present application provides an apparatus for determining a state of health of a battery, the apparatus comprising:
A first determining unit for determining a target capacity interval of the battery to be measured;
The second determining unit is used for determining a first charge and discharge amount and a second charge and discharge amount of the battery to be tested according to the target capacity interval, wherein the first charge and discharge amount is an actual charge and discharge amount of the battery to be tested in the target capacity interval, and the second charge and discharge amount is a theoretical charge and discharge amount of the battery to be tested in the target capacity interval;
And the third determining unit is used for determining the first health state of the battery to be tested according to the first charge and discharge quantity and the second charge and discharge quantity.
In some embodiments, the target capacity interval is represented by a remaining capacity of the battery under test; the first determining unit is configured to determine a first remaining power and a second remaining power of the battery to be measured, where the first remaining power and the second remaining power are two remaining powers measured by the battery to be measured at different times; and determining the difference value between the first residual electric quantity and the second residual electric quantity as a target capacity interval of the battery to be tested.
In some embodiments, the second determining unit is configured to calculate a charge-discharge amount of the battery to be measured when the remaining amount of the battery to be measured changes from the first remaining amount to the second remaining amount, so as to obtain the first charge-discharge amount; determining the rated electric quantity of the battery to be tested; and determining the product of the target capacity interval and the rated power as the second charging and discharging capacity.
In some embodiments, the first determining unit is configured to determine a third remaining power and a fourth remaining power measured by the battery to be measured at different times; and correcting the third residual electric quantity to obtain the first residual electric quantity, and correcting the fourth residual electric quantity to obtain the second residual electric quantity.
In some embodiments, the target capacity interval is defined by a charging voltage of the battery under test; the first determining unit is configured to determine a first preset voltage and a second preset voltage, where the first preset voltage is an initial charging voltage of the battery to be tested, and the second preset voltage is an ending charging voltage of the battery to be tested; and determining the difference value between the second preset voltage and the first preset voltage as a target capacity interval of the battery to be tested.
In some embodiments, the second determining unit is configured to, before the to-be-measured battery leaves the factory, start charging the to-be-measured battery with a preset current from the first preset voltage until the voltage of the to-be-measured battery is the second preset voltage, and count a first charging duration; determining the second charge and discharge amount according to the preset current and the first charge duration; when a first health state needs to be determined, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting a second charging time period; and determining the first charge and discharge amount according to the preset current and the second charge duration.
In some embodiments, the third determining unit is configured to determine, as the first health state of the battery to be tested, a ratio between the first charge-discharge amount and the second charge-discharge amount.
In some embodiments, the apparatus further comprises:
the charging unit is used for charging the battery to be tested from a preset initial charging voltage before the battery to be tested leaves the factory, so as to obtain a first charging voltage of the battery to be tested after a preset charging time period;
The charging unit is used for charging the battery to be tested from the initial charging voltage when the first health state needs to be determined, so as to obtain a second charging voltage of the battery to be tested after a preset charging time period;
a fourth determining unit configured to determine a first difference between the first charging voltage and the initial charging voltage; and determining a second difference between the second charging voltage and the initial charging voltage;
The third determining unit is further configured to determine a ratio of the first difference value and the second difference value as a second health state of the battery to be tested;
The third determining unit is further configured to determine a health state of the battery to be tested according to the second health state and the first health state.
A third aspect of an embodiment of the present application provides a vehicle comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing a method of determining a state of health of a battery as described above when executing the computer program.
A fourth aspect of the embodiments of the present application provides a computer readable storage medium storing a computer program which, when executed by a processor, implements a method of determining a state of health of a battery as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
In the embodiment of the application, the health state of the battery is determined by determining the target capacity interval of the battery to be measured according to the actual charge and discharge amount and the theoretical charge and discharge amount in the target capacity interval. Therefore, the battery does not need to carry out a complete charge and discharge process, and the health state of the battery can be determined only by selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
Drawings
FIG. 1 illustrates a flow chart of a method of determining battery state of health provided by an exemplary embodiment;
FIG. 2 is a flow chart of a method for determining a state of health of a battery when a target capacity interval is represented by a remaining capacity of the battery to be measured according to an exemplary embodiment;
FIG. 3 is a flow chart of a method for determining battery health when a target capacity interval is represented by a charging voltage of a battery under test according to an exemplary embodiment;
FIG. 4 illustrates a flow chart of a method for determining battery state of health in combination with various methods provided by one exemplary embodiment;
FIG. 5 illustrates a schematic diagram of an apparatus for determining battery state of health according to an exemplary embodiment;
Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
With the development of automobile technology, new energy automobiles are becoming more popular. An electric vehicle or a hybrid vehicle is a representative of a new energy vehicle. The electric vehicle or the hybrid bicycle is provided with a battery, and the battery is continuously aged along with continuous charge and discharge cycles, and an index for judging the aging degree Of the battery is a battery State Of Health (SOH).
In some embodiments, the battery state of health may be estimated by the charge-discharge capacity of the battery. That is, the maximum charge/discharge capacity of the battery is obtained, and the state of health of the battery is represented by the ratio of the maximum charge/discharge capacity to the rated capacity of the battery.
However, since the battery is in actual use, it is difficult to have a complete charge and discharge process. For example, the battery may be completely discharged, which may cause a problem of battery power shortage, so that the user may not wait until the battery is completely discharged to charge, resulting in inaccurate maximum charge-discharge capacity and inaccurate estimated battery state of health.
In order to solve the technical problems, the application provides a method for determining the health state of a battery, a vehicle and a storage medium. And determining the health state of the battery according to the actual charge and discharge quantity and the theoretical charge and discharge quantity in the target capacity interval by determining the target capacity interval of the battery to be detected. Therefore, only a part of the battery capacity is selected to determine the health state of the battery, and the health state of the battery can be determined without using a complete charge and discharge process, so that the accuracy of determining the health state of the battery is improved.
The application scenario of the present application is described below. The application can be applied to any scenario in which it is necessary to determine the state of health of a battery. For example, in electric vehicles or hybrid vehicles. The battery to be tested can be a chemical battery, a biological battery or a physical battery. The type of the battery to be tested may be any type, and in the embodiment of the present application, the type of the battery to be tested is not particularly limited. For example, the battery to be tested is a lithium iron phosphate battery (LFP battery) or a ternary lithium battery (NCM battery) among chemical batteries.
The method for determining the state of health of the battery provided by the application is described in detail below. Referring to fig. 1, a flowchart of a method for determining a battery state of health according to an embodiment of the application is shown. By way of example and not limitation, the method is applied in a vehicle.
S101, the vehicle determines a target capacity interval of a battery to be tested.
The target capacity space represents a part of the chargeable space of the battery to be measured. The target capacity interval may be represented by different criteria. For example, the target capacity interval may be represented by a remaining charge amount of the battery to be measured; or the target capacity interval may be represented by a start charging voltage and an end charging voltage of the battery to be measured. In the embodiment of the present application, the target capacity interval is not particularly limited.
S102, the vehicle determines a first charge and discharge amount and a second charge and discharge amount of the battery to be tested according to the target capacity interval, wherein the first charge and discharge amount is an actual charge and discharge amount of the battery to be tested in the target capacity interval, and the second charge and discharge amount is a theoretical charge and discharge amount of the battery to be tested in the target capacity interval.
And the vehicle charges and discharges the battery to be tested in the target capacity interval, calculates the actual first charge and discharge quantity of the battery to be tested in the target capacity interval, and determines the rated second discharge quantity of the battery to be tested according to the factory data or the rated charge and discharge quantity of the battery to be tested.
S103, the vehicle determines a first health state of the battery to be tested according to the first charge and discharge amount and the second charge and discharge amount.
The vehicle may determine a ratio of the first charge-discharge amount and the second charge-discharge amount as a first health state of the battery to be tested, and correspondingly, the vehicle determines a ratio between the first charge-discharge amount and the second charge-discharge amount as the first health state of the battery to be tested.
For example, if the first charge/discharge amount is Q and the second charge/discharge amount is Q0, the first health state may be soh=q/Q0.
In the embodiment of the application, the health state of the battery is determined by determining the target capacity interval of the battery to be measured according to the actual charge and discharge amount and the theoretical charge and discharge amount in the target capacity interval. Therefore, the battery does not need to carry out a complete charge and discharge process, and the health state of the battery can be determined only by selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
The method for determining the battery state of health according to the embodiment of the present application is described below with reference to different metrics of the target capacity region. Referring to fig. 2, a method for determining a state of health of a battery when a target capacity interval is represented by a remaining capacity of the battery to be measured is shown. By way of example and not limitation, the method is applied in a vehicle.
S201, the vehicle determines a first residual capacity and a second residual capacity of the battery to be measured, wherein the first residual capacity and the second residual capacity are two residual capacities of the battery to be measured at different times.
The first residual capacity and the second residual capacity can be two residual capacities measured at different time points in the use process of the battery to be measured. In some embodiments, the first remaining power and the second remaining power may be two remaining powers determined by a first preset duration, where the first preset duration may be set as required, and in embodiments of the present application, the first preset duration is not specifically limited. For example, the first preset time period may be one day, three days, one week, or the like.
In some embodiments, the first remaining power and the second remaining power may be remaining power of the battery to be measured during any two power corrections recorded during the power correction. In the embodiment of the present application, this is not particularly limited. For example, the first remaining power and the second remaining power may be remaining powers recorded during correction of the adjacent two electric powers.
In some embodiments, the first remaining power and the second remaining power may be two remaining powers of the battery to be measured at different times. It should be noted that the vehicle may use any two remaining amounts measured as the first remaining amount and the second remaining amount. The vehicle can also correct any two measured residual electric quantities, and the corrected electric quantity is used as a first residual electric quantity and a second residual electric quantity. Correspondingly, the vehicle determines the third residual capacity and the fourth residual capacity of the battery to be measured, which are measured at different times; and correcting the third residual electric quantity to obtain the first residual electric quantity, and correcting the fourth residual electric quantity to obtain the second residual electric quantity.
The correction method may be any battery power correction method, for example, open circuit voltage (Open Circuit Voltage, OCV) correction. In the implementation mode, the residual electric quantity of the battery is corrected, so that deviation of calculation of the residual electric quantity of the battery caused by the attenuation of the capacity of the battery is prevented, the obtained residual electric quantity is more accurate, and the accuracy of determining the health state of the battery to be tested is improved.
S202, the vehicle determines the difference value between the first residual electric quantity and the second residual electric quantity as a target capacity interval of the battery to be tested.
The vehicle determines a difference between the first remaining power and the second remaining power, and determines the difference as the target capacity interval. For example, if the first remaining power is SOC1 and the second remaining power is SOC2, the target capacity region is (SOC 2-SOC 1).
And S203, counting the charge and discharge quantity of the battery to be tested when the residual quantity of the battery to be tested changes from the first residual quantity to the second residual quantity by the vehicle to obtain the first charge and discharge quantity.
The vehicle may perform at least one charging and/or discharging process between the measurement of the first remaining power and the obtaining of the second remaining power, and in this step, the vector sum of the charging and discharging amounts of the battery to be measured for charging and discharging is determined as the first charging and discharging amount. For example, the amount of charge increased during the charging process is determined as a positive value, the amount of charge consumed during the discharging process is determined as a negative value, and between the first remaining amount and the second remaining amount, the positive value obtained through the charging process is summed with the negative value obtained through the discharging to obtain the first charge-discharge amount.
S204, the vehicle determines the rated electric quantity of the battery to be tested.
The rated power can be the power calibrated before the battery to be tested leaves the factory. The rated power may be stored in the vehicle, and in this step, the vehicle reads the stored rated power of the battery to be measured.
S205, the vehicle determines the product of the target capacity interval and the rated electric quantity as the second charge-discharge quantity.
The product of the target capacity interval and the rated electric quantity is the electric quantity which the battery to be tested theoretically should store or release in the target capacity interval, so that the product of the target capacity interval and the rated electric quantity is determined as the second charge and discharge quantity. For example, if the first remaining power is SOC1, the second remaining power is SOC2, the rated power is C0, and the second charge/discharge power is (SOC 2-SOC 1) ×c0.
It should be noted that, the SOC2-SOC1 may be a negative value when discharging the redundant charge power, and correspondingly, the first charge-discharge power is also a negative value.
S206, the vehicle determines the first health state of the battery to be tested according to the first charge and discharge amount and the second charge and discharge amount.
In this implementation, a ratio of the first charge-discharge amount to the second charge-discharge amount is determined as a first state of health of the battery. For example, the first charge/discharge amount is Q, the second charge/discharge amount is (SOC 2-SOC 1) ×c0, and the first state of health of the battery to be measured is Q/[ (SOC 2-SOC 1) ×c0].
In the embodiment of the application, the health state of the battery is determined by determining the target capacity interval of the battery to be measured according to the actual charge and discharge amount and the theoretical charge and discharge amount in the target capacity interval. Therefore, the battery does not need to carry out a complete charge and discharge process, and the health state of the battery can be determined only by selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
Further, the target capacity interval is determined by determining the difference between the first charge and discharge amount and the second charge and discharge amount, and the whole health state of the battery is represented by the partial capacity interval of the battery to be tested, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
Referring to fig. 3, a method for determining a state of health of a battery when a target capacity interval is represented by a charging voltage of the battery to be measured is shown. By way of example and not limitation, the method is applied in a vehicle.
S301, the vehicle determines a first preset voltage and a second preset voltage, wherein the first preset voltage is an initial charging voltage of the battery to be tested, and the second preset voltage is an ending charging voltage of the battery to be tested.
The first preset voltage and the second preset voltage may be set according to the requirements and the battery characteristics, and in the embodiment of the present application, the first preset voltage and the second preset voltage are not specifically limited. For example, the first preset voltage may be set according to a type of a battery, when the battery to be measured is an LFP battery, the first preset voltage is any voltage of non-platform voltages, and when the battery to be measured is an NCM battery, the first preset voltage is any charging voltage. For example, the first preset voltage may be a 3.27V dynamic charge voltage. The second preset voltage may be any charging voltage greater than the first preset voltage. For example, the second preset voltage may be a voltage when the battery is fully charged. In the embodiment of the present application, this is not particularly limited.
S302, the vehicle determines the difference value between the second preset voltage and the first preset voltage as a target capacity interval of the battery to be tested.
The vehicle determines a difference between the second preset voltage and the first preset voltage, and determines the difference as a target capacity interval of the battery to be tested.
S303, before the battery to be tested leaves the factory, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting the first charging time by the vehicle.
The preset current may be determined according to a charging map of the battery to be measured, and the preset current may be a minimum charging current. Before the battery to be tested leaves the factory, counting the first charging time length required by the vehicle when the battery to be tested is charged from the first preset voltage to the second preset voltage.
It should be noted that, when the battery to be tested starts to charge, at least a third preset duration may be charged before the voltage reaches the first preset voltage, so as to ensure that the charging voltage reaches the first preset voltage and the charging voltage is polarized when the battery to be tested starts to charge. For example, the third preset time period is 10 seconds, 14 seconds, 8 seconds, or the like. In the actual charging, the actual charging current may deviate from the preset current, but the deviation is controlled to be smaller than a preset value, which may be set as required, for example, the preset value may be 2A, 2.5A, or 1.5A.
In addition, the temperature of the battery to be tested when starting to charge is within a preset temperature range, so that when the charging voltage of the battery reaches a first preset voltage due to the planned difference of different temperatures, the residual electric quantity difference of the battery is excessive, and the accuracy of the first health state is ensured. The preset temperature range may be set as required, and in the embodiment of the present application, the preset temperature range is not specifically limited. For example, the predetermined temperature range may be [20 ℃,30 ℃).
S304, the vehicle determines the second charge and discharge amount according to the preset current and the first charge duration.
In this step, the second charge and discharge amount is obtained by integrating the preset current for the first charge duration.
S305, when the first health state needs to be determined, the vehicle starts from the first preset voltage, charges the battery to be tested with a preset current until the voltage of the battery to be tested is the second preset voltage, and counts a second charging duration.
In some embodiments, the vehicle may determine the first health state of the battery to be tested once every second preset time period, where the second preset time period may be set as required, and in embodiments of the present application, the second preset time period is not specifically limited. For example, the second preset may be 1 day, 1 week, 1 month, or the like. Accordingly, each second preset time period, the vehicle determines that the first health state needs to be redetermined. In some embodiments, the vehicle, upon receiving a user's view request, determines that a first state of health of the battery under test needs to be redetermined.
The process of the vehicle counting the second charging time period is the same as the principle of counting the first charging time period in step S303, and will not be described here again.
S306, the vehicle determines the first charge and discharge amount according to the preset current and the second charge duration.
The principle of this step is the same as that of step S304, and will not be described here again.
S307, the vehicle determines the first health state of the battery to be tested according to the first charge and discharge amount and the second charge and discharge amount.
The principle of this step is the same as that of step S103, and will not be described here again.
In the embodiment of the application, the health state of the battery is determined by determining the target capacity interval of the battery to be measured according to the actual charge and discharge amount and the theoretical charge and discharge amount in the target capacity interval. Therefore, the battery does not need to carry out a complete charge and discharge process, and the health state of the battery can be determined only by selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
Further, the target capacity interval is determined by determining the difference between the first charge and discharge amount and the second charge and discharge amount, and the whole health state of the battery is represented by the partial capacity interval of the battery to be tested, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
In some embodiments, the vehicle may determine the state of health of the battery under test in a number of ways, and determine the state of health of the battery under test based on the state of health determined in different ways. For example, the vehicle may determine the values of two states of health of the battery under test according to the two methods described above, respectively, and then determine the state of health of the battery under test according to the battery states of health determined by the different methods. The vehicle may also determine the state of health of the battery under test in the following manner.
In practical applications, developers also determine the state of health of the battery by comparing the charge power of the battery. The state of health of the battery is determined, for example, by the ratio of the current power of the battery to be measured to the maximum power. The maximum power is generally obtained through table lookup, that is, the product of the rated maximum power of the battery and the current capacity retention rate of the battery is determined as the current maximum power of the battery. However, the capacity retention rate of the battery is different from the decay trend of the power of the battery, resulting in inaccurate determination of the battery power, and thus, a new method of determining the battery power is required.
Through developer testing, the power of different stages can be determined by determining the internal resistance of the battery in different stages. First, a charging current is selected, which may be the minimum current in the charging map. And selecting an initial charging voltage, wherein the initial charging voltage can be any value, for example, the initial charging voltage is 3.6V, and charging is started for a fourth preset time period from the initial voltage according to the charging current to obtain the current voltage V of the battery to be tested, so that the direct current internal resistance R= (V-3.6)/I of the battery to be tested is obtained. The power is p=u 2/R.
When the initial power P0 and the current power P of the battery are determined through the above processes before the battery leaves the factory and when the battery state of health needs to be determined, respectively, the initial power p0=u 2/R0 and the current power p1=u 2/R1 are determined.
Wherein, R0 is the initial dc internal resistance of the battery to be measured, R1 is the current dc internal resistance of the battery to be measured, and then the initial dc internal resistance r0= (V1-3.6)/I, and the current dc internal resistance r1= (V2-3.6)/I. Then battery state of health soh=p/p0= (U 2/R1）/（U2/R0) =r0/r1= (V1-3.6)/(V2-3.6).
The applicant's experimental calculation shows that the state of health of the battery can be determined by the ratio of the difference between the voltage obtained by charging the preset time period and the initial charging voltage when the battery to be tested leaves the factory and the difference between the voltage obtained by the current electric preset time period of the battery to be tested and the initial charging voltage, and accordingly, please refer to fig. 4, which shows a method for determining the state of health of the battery by combining multiple methods. By way of example and not limitation, the method is applied in a vehicle.
S401, before the battery to be tested leaves the factory, the vehicle starts to charge the battery to be tested from a preset initial charging voltage, and a first charging voltage of the battery to be tested after a fourth preset charging time period is obtained.
And S402, when the first health state needs to be determined, the vehicle starts to charge the battery to be tested from the initial charging voltage to obtain a second charging voltage of the battery to be tested after a fourth preset charging time period.
S403, the vehicle determines a first difference value between the first charging voltage and the initial charging voltage.
S404, the vehicle determines a second difference between the second charging voltage and the initial charging voltage.
S405, the vehicle determines the ratio of the first difference value and the second difference value as a second health state of the battery to be tested.
S406, the vehicle determines the health state of the battery to be tested according to the second health state and the first health state.
In some embodiments, the vehicle may compare the first health status and the second health status, and if the difference between the first health status and the second health status is within a preset range, one of the first health status or the second health status may be used as the health status of the battery to be tested. If the difference between the first health state and the second health state is not within the preset range, the vehicle can determine the average value of the first health state and the second health state as the health state of the battery to be tested. Or the vehicle may determine the first and second health states as the health state of the battery under test by weighted summation.
In the embodiment of the application, the health state of the battery is determined by determining the target capacity interval of the battery to be measured according to the actual charge and discharge amount and the theoretical charge and discharge amount in the target capacity interval. Therefore, the battery does not need to carry out a complete charge and discharge process, and the health state of the battery can be determined only by selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved. Further, the health state of the battery to be measured is determined in different modes, so that the accuracy of determining the health state of the battery is further improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Referring to fig. 5, which is a schematic structural diagram of an apparatus for determining a state of health of a battery according to the present application, each unit included for performing each step in the above embodiment, referring to fig. 5, the apparatus for determining a state of health of a battery includes:
a first determining unit 501 configured to determine a target capacity interval of a battery to be measured;
A second determining unit 502, configured to determine, according to the target capacity interval, a first charge-discharge amount and a second charge-discharge amount of the battery to be measured, where the first charge-discharge amount is an actual charge-discharge amount of the battery to be measured in the target capacity interval, and the second charge-discharge amount is a theoretical charge-discharge amount of the battery to be measured in the target capacity interval;
A third determining unit 503, configured to determine a first health state of the battery to be tested according to the first charge-discharge amount and the second charge-discharge amount.
In some embodiments, the target capacity interval is represented by a remaining capacity of the battery under test; the first determining unit 501 is configured to determine a first remaining power and a second remaining power of the battery to be measured, where the first remaining power and the second remaining power are two remaining powers measured by the battery to be measured at different times; and determining the difference value between the first residual electric quantity and the second residual electric quantity as a target capacity interval of the battery to be tested.
In some embodiments, the second determining unit 502 is configured to calculate a charge-discharge amount of the battery to be measured when the remaining amount of the battery to be measured changes from the first remaining amount to the second remaining amount, so as to obtain the first charge-discharge amount; determining the rated electric quantity of the battery to be tested; and determining the product of the target capacity interval and the rated power as the second charging and discharging capacity.
In some embodiments, the first determining unit 501 is configured to determine a third remaining power and a fourth remaining power measured by the battery to be measured at different times; and correcting the third residual electric quantity to obtain the first residual electric quantity, and correcting the fourth residual electric quantity to obtain the second residual electric quantity.
In some embodiments, the target capacity interval is defined by a charging voltage of the battery under test; the first determining unit 501 is configured to determine a first preset voltage and a second preset voltage, where the first preset voltage is an initial charging voltage of the battery to be tested, and the second preset voltage is an ending charging voltage of the battery to be tested; and determining the difference value between the second preset voltage and the first preset voltage as a target capacity interval of the battery to be tested.
In some embodiments, the second determining unit 502 is configured to, before the battery to be tested leaves the factory, start charging the battery to be tested with a preset current from the first preset voltage until the voltage of the battery to be tested is the second preset voltage, and count a first charging duration; determining the second charge and discharge amount according to the preset current and the first charge duration; when a first health state needs to be determined, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting a second charging time period; and determining the first charge and discharge amount according to the preset current and the second charge duration.
In some embodiments, the third determining unit 503 is configured to determine a ratio between the first charge-discharge amount and the second charge-discharge amount as the first health state of the battery under test.
In some embodiments, the apparatus further comprises:
the charging unit is used for charging the battery to be tested from a preset initial charging voltage before the battery to be tested leaves the factory, so as to obtain a first charging voltage of the battery to be tested after a preset charging time period;
The charging unit is used for charging the battery to be tested from the initial charging voltage when the first health state needs to be determined, so as to obtain a second charging voltage of the battery to be tested after a preset charging time period;
a fourth determining unit configured to determine a first difference between the first charging voltage and the initial charging voltage; and determining a second difference between the second charging voltage and the initial charging voltage;
The third determining unit 503 is further configured to determine a ratio of the first difference value and the second difference value as a second health state of the battery to be tested;
The third determining unit 503 is further configured to determine a health status of the battery to be tested according to the second health status and the first health status.
In the embodiment of the application, the health state of the battery is determined by determining the target capacity interval of the battery to be measured according to the actual charge and discharge amount and the theoretical charge and discharge amount in the target capacity interval. Therefore, the battery does not need to carry out a complete charge and discharge process, and the health state of the battery can be determined only by selecting a part of the battery capacity to carry out charge and discharge, so that the health state of the battery can be determined without using a complete charge and discharge process, and the accuracy of determining the health state of the battery is improved.
Fig. 6 is a schematic diagram of a vehicle according to an exemplary embodiment of the present application. As shown in fig. 6, the vehicle 6 of this embodiment includes: a processor 60, a memory 61 and a computer program 62 stored in the memory 61 and executable on the processor 60, such as a program for determining the state of health of a battery. The processor 60, when executing the computer program 62, implements the steps of the various embodiments of the method for determining battery state of health described above, such as steps S101 through S103 shown in fig. 2. Or the processor 60, when executing the computer program 62, performs the functions of the units in the above-described device embodiments, for example the functions of the units 501 to 503 shown in fig. 5.
By way of example, the computer program 62 may be partitioned into one or more units that are stored in the memory 61 and executed by the processor 60 to complete the present application. The one or more elements may be a series of computer program instruction segments capable of performing particular functions for describing the execution of the computer program 62 for use in the vehicle 6. For example, the computer program 62 may be divided into a first determination unit, a second determination unit and a third determination unit, each module specifically functioning as follows:
a first determining unit 501 configured to determine a target capacity interval of a battery to be measured;
A second determining unit 502, configured to determine, according to the target capacity interval, a first charge-discharge amount and a second charge-discharge amount of the battery to be measured, where the first charge-discharge amount is an actual charge-discharge amount of the battery to be measured in the target capacity interval, and the second charge-discharge amount is a theoretical charge-discharge amount of the battery to be measured in the target capacity interval;
A third determining unit 503, configured to determine a first health state of the battery to be tested according to the first charge-discharge amount and the second charge-discharge amount.
The vehicle 6 may be any vehicle having a control function. The vehicle 6 may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that fig. 6 is merely an example of the vehicle 6 and is not intended to limit the vehicle 6, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the vehicle 6 may further include input and output devices, network access devices, buses, etc.
The Processor 60 may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the vehicle 6, such as a hard disk or a memory of the vehicle 6. The memory 61 may also be an external storage device of the vehicle 6, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD), or the like, which are provided on the vehicle 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the vehicle 6. The memory 61 is used for storing the computer program and other programs and data required by the terminal device. The memory 61 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the respective method embodiments described above.
The embodiments of the present application also provide a computer program product which, when run on a mobile terminal, causes the mobile terminal to perform the steps of the method embodiments described above.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method of determining a state of health of a battery, the method comprising:
Determining a target capacity interval of a battery to be tested;
Determining a first charge and discharge amount and a second charge and discharge amount of the battery to be measured according to the target capacity interval, wherein the first charge and discharge amount is an actual charge and discharge amount of the battery to be measured in the target capacity interval, and the second charge and discharge amount is a theoretical charge and discharge amount of the battery to be measured in the target capacity interval;
and determining the first health state of the battery to be tested according to the first charge and discharge amount and the second charge and discharge amount.
2. The method of claim 1, wherein the target capacity interval is represented by a remaining capacity of the battery under test; the determining the target capacity interval of the battery to be tested comprises the following steps:
Determining a first residual capacity and a second residual capacity of the battery to be measured, wherein the first residual capacity and the second residual capacity are two residual capacities measured by the battery to be measured at different times;
And determining the difference value between the first residual electric quantity and the second residual electric quantity as a target capacity interval of the battery to be tested.
3. The method of claim 2, wherein determining the first charge-discharge amount and the second charge-discharge amount of the battery to be measured according to the target capacity interval comprises:
Counting the charge and discharge capacity of the battery to be tested when the residual capacity of the battery to be tested changes from the first residual capacity to the second residual capacity, and obtaining the first charge and discharge capacity;
determining the rated electric quantity of the battery to be tested;
And determining the product of the target capacity interval and the rated power as the second charging and discharging capacity.
4. The method of claim 2, wherein determining the first and second remaining amounts of the battery under test comprises:
Determining a third residual capacity and a fourth residual capacity measured by the battery to be measured at different times;
and correcting the third residual electric quantity to obtain the first residual electric quantity, and correcting the fourth residual electric quantity to obtain the second residual electric quantity.
5. The method of claim 1, wherein the target capacity interval is defined by a charging voltage of a battery under test; the determining the target capacity interval of the battery to be tested comprises the following steps:
determining a first preset voltage and a second preset voltage, wherein the first preset voltage is an initial charging voltage of the battery to be tested, and the second preset voltage is an ending charging voltage of the battery to be tested;
And determining the difference value between the second preset voltage and the first preset voltage as a target capacity interval of the battery to be tested.
6. The method of claim 5, wherein determining the first charge-discharge amount and the second charge-discharge amount of the battery to be measured according to the target capacity interval comprises:
Before the battery to be tested leaves the factory, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting a first charging time;
determining the second charge and discharge amount according to the preset current and the first charge duration;
When a first health state needs to be determined, starting from the first preset voltage, charging the battery to be tested with preset current until the voltage of the battery to be tested is the second preset voltage, and counting a second charging time period;
And determining the first charge and discharge amount according to the preset current and the second charge duration.
7. The method of any of claims 1-6, wherein determining the first state of health of the battery under test based on the first charge-discharge amount and the second charge-discharge amount comprises:
And determining the ratio between the first charge and discharge amount and the second charge and discharge amount as a first health state of the battery to be tested.
8. The method of any one of claims 1-6, wherein the method further comprises:
before the battery to be tested leaves the factory, starting from a preset initial charging voltage, charging the battery to be tested to obtain a first charging voltage of the battery to be tested after a preset charging time period;
When a first health state needs to be determined, starting from the initial charging voltage, charging the battery to be tested to obtain a second charging voltage of the battery to be tested after a preset charging time period;
determining a first difference between the first charging voltage and the initial charging voltage; and determining a second difference between the second charging voltage and the initial charging voltage;
Determining the ratio of the first difference value to the second difference value as a second health state of the battery to be tested;
and determining the health state of the battery to be tested according to the second health state and the first health state.
9. A vehicle comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein execution of the computer program by the processor causes the method of determining a state of health of a battery as claimed in any one of claims 1 to 8 to be carried out.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the method of determining the state of health of a battery according to any one of claims 1 to 8.
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| CN117590268A (en) * | 2023-11-23 | 2024-02-23 | 国网青海省电力公司清洁能源发展研究院 | State evaluation method for battery energy storage system |
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| CN112924869A (en) * | 2021-02-08 | 2021-06-08 | 北京车和家信息技术有限公司 | Method and device for determining health state of battery pack |
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