CN116736124A - Method and device for evaluating battery discharge capacity, electronic equipment and storage medium - Google Patents
Method and device for evaluating battery discharge capacity, electronic equipment and storage medium Download PDFInfo
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Abstract
The disclosure provides a battery discharge capacity evaluation method, a battery discharge capacity evaluation device, electronic equipment and a storage medium, and relates to the technical field of battery management. The method comprises the following steps: acquiring the current ambient temperature, the battery state of charge and the battery state of health; determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery state of charge and a reference health state; determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state; and determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current. According to the method and the device, the current battery discharge capacity is determined according to the current battery direct current internal resistance, the reference direct current internal resistance under the reference health state and the reference discharge current, so that accurate assessment of the battery discharge capacity in the use process is realized, and a reliable basis is provided for intelligent management and maintenance of the battery.
Description
Technical Field
The disclosure relates to the technical field of battery management, and in particular relates to a method and a device for evaluating battery discharge capacity, electronic equipment and a storage medium.
Background
At present, with the continuous popularization of electric vehicles, a power battery is one of the most widely used secondary batteries. However, the discharge capacity of the power battery gradually decreases during the repeated use thereof. The discharging capacity of the battery directly influences the power performance of the vehicle, so that the research on how to accurately evaluate the discharging capacity of the battery in the using process has important significance.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
An embodiment of a first aspect of the present disclosure provides a method for evaluating a battery discharging capability, including:
acquiring the current ambient temperature, the battery state of charge and the battery state of health;
determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery state of charge and a reference health state;
determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state;
and determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current.
An embodiment of a second aspect of the present disclosure provides an apparatus for evaluating a battery discharge capacity, including:
The acquisition module is used for acquiring the current ambient temperature, the battery charge state and the battery health state;
the first determining module is used for determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and a reference health state;
the second determining module is used for determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state;
and the third determining module is used for determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current.
An embodiment of a third aspect of the present disclosure provides an electronic device, including: a memory, a processor, and computer instructions stored on the memory and executable on the processor, which when executed, implement a method as set forth in embodiments of the first aspect of the present disclosure.
An embodiment of a fourth aspect of the present disclosure proposes a vehicle comprising an electronic device as proposed in an embodiment of the third aspect of the present disclosure.
Embodiments of the fifth aspect of the present disclosure provide a non-transitory computer-readable storage medium storing computer instructions which, when executed by a processor, implement a method as provided by embodiments of the first aspect of the present disclosure.
Embodiments of a sixth aspect of the present disclosure propose a computer program product which, when executed by an instruction processor in the computer program product, performs the method proposed by the embodiments of the first aspect of the present disclosure.
The method, the device, the computer equipment and the storage medium for evaluating the battery discharge capacity have the following beneficial effects:
firstly, acquiring the current ambient temperature, the battery state of charge and the battery state of health; then determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and the reference health state; then determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state; and finally, determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current. The method and the device determine the direct current internal resistance of the battery based on the ambient temperature, the battery state of charge and the battery state of health, and determine the current discharge capacity of the battery according to the current direct current internal resistance of the battery, the reference direct current internal resistance under the reference state of health and the reference discharge current, thereby realizing accurate assessment of the discharge capacity of the battery in the use process and providing a reliable basis for intelligent management and maintenance of the battery.
Additional aspects and advantages of the disclosure 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 disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flowchart of a method for evaluating battery discharge capacity according to an embodiment of the disclosure;
fig. 2 is a flowchart illustrating a method for evaluating battery discharge capacity according to another embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a first mapping relationship between an ambient temperature, a state of charge, and a dc internal resistance, which corresponds to a reference health state, in an embodiment of the disclosure;
fig. 4 is a flowchart illustrating a third mapping relationship between an ambient temperature, a state of charge, and a dc internal resistance corresponding to a battery state of health according to an embodiment of the disclosure;
fig. 5 is a schematic structural diagram of an evaluation device for battery discharge capability according to an embodiment of the disclosure;
fig. 6 illustrates a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.
The following describes a battery discharge capacity evaluation method, apparatus, electronic device, and storage medium of the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a method for evaluating battery discharge capacity according to an embodiment of the disclosure.
The embodiment of the disclosure is illustrated by the method for evaluating the battery discharging capability being configured in the device for evaluating the battery discharging capability, and the device for evaluating the battery discharging capability can be applied to any hardware device with various operating systems, touch screens and/or display screens, such as vehicle-mounted devices, cloud devices and the like, so that the device can execute the function of evaluating the battery discharging capability.
As shown in fig. 1, the method for evaluating the discharge capacity of a battery may include the steps of:
step 101, obtaining the current ambient temperature, the battery state of charge and the battery state of health.
It will be appreciated that ambient temperature has some effect on the discharge capacity of the battery. For example, when the ambient temperature is too high or too low, the battery discharge capacity may be deteriorated as compared to normal temperature.
The ambient temperature may be the temperature of the environment in which the battery is located, or may be the battery temperature. Therefore, the temperature around the battery or the temperature of the battery itself can be detected as the ambient temperature.
The State of Health (SOH) is related to the battery capacity. For example, the capacity of a completely new battery is 100Ah, and the battery state of health is defined as 100% soh; when the battery is used, the actual capacity becomes 90Ah, which is 90% of the original capacity, and the battery state of health is defined as 90% soh.
State Of Charge (SOC) Of the battery, i.e., the remaining battery power. For example, the battery full capacity is 100Ah, but the current capacity of the battery is 50Ah, the battery state of charge is defined as 50% SOC; if the actual capacity of the battery decays to 90Ah, then the 50% soc is defined as the current charge of the battery being 45Ah.
It will be appreciated that as the battery is used, its state of charge and state of health change gradually, as well as its discharge capacity. Therefore, in order to determine the current discharge capacity of the battery, the current ambient temperature, the battery state of charge and the battery state of health can be obtained,
step 102, determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and the reference health state.
It should be noted that, the health status of the battery in the use process is determined by taking the health status of the brand new battery as a comparison standard. Thus, the reference state of health may be the state of health of a completely new battery, i.e. 100% soh.
The direct current internal resistance (Directive Current Resistance, abbreviated as DCR) refers to the ratio of the voltage change of the battery to the corresponding discharge current change under the working condition. The larger the DC internal resistance of the battery is, the faster the voltage drop is at the same current, and the shorter the continuous discharge time is at the same power.
It is understood that the internal dc resistance of a battery is affected by the ambient temperature and the state of charge of the battery under any state of health. Therefore, the reference direct current internal resistance can be determined according to the ambient temperature, the battery state of charge and the reference state of health.
The reference direct current internal resistance is determined according to the ambient temperature, the battery charge state and the reference health state, and can be realized in any possible mode.
For example, a machine learning model may be established, through which the input ambient temperature, battery state of charge, and reference state of health are parsed to determine the corresponding reference dc internal resistances.
Alternatively, a mapping relationship between the ambient temperature, the battery state of charge, and the reference state of health and the reference internal dc resistance may be established. The reference direct current internal resistance corresponding to any ambient temperature and any battery charge state under the reference health state can be inquired or calculated through the mapping relation.
Wherein the discharge current is the current that the battery forms when discharging the stored electrical energy to the load. Due to the chemical characteristics of the battery, the voltage of the battery gradually decreases during discharging, and the discharging time is longer when the discharging current is smaller; the discharge time is shorter as the discharge current is larger.
It will be appreciated that the battery discharge capacity may be determined based on the current level at which the battery discharges stored electrical energy over a prescribed period of time. The predetermined discharge time may be set according to actual needs. For example, 10s, 30s, 60s, etc. can be set.
Thus, the reference discharge current may be a current intensity of a battery in a reference state of health, discharging the stored electric energy for a prescribed time. It should be noted that, in the reference health state, the reference discharge current corresponding to different ambient temperatures and different battery states of charge is different.
In the embodiment of the disclosure, the reference discharge current is determined according to the ambient temperature, the battery charge state and the reference health state, and can be implemented in any possible manner.
For example, a machine learning model may be established, through which the input ambient temperature, battery state of charge, and reference state of health are parsed to determine the corresponding reference discharge current.
Alternatively, a mapping relationship between ambient temperature, battery state of charge, and reference state of health and reference discharge current may be established. The reference discharge current corresponding to any ambient temperature and any battery charge state under the reference health state can be inquired or calculated through the mapping relation.
For example, in the reference state of health, when the ambient temperature is T1 and the battery state of charge is SOC1, the corresponding DC internal resistance of the battery can be determined to be R 11 . When the ambient temperature is T1 and the battery state of charge is SOC2, the corresponding battery DC internal resistance can be determined to be R 12 . When the ambient temperature is T2 and the battery state of charge is SOC2, the corresponding battery DC internal resistance can be determined to be R 22 。
It should be noted that the foregoing examples are only illustrative, and are not intended to limit the determination of the reference dc internal resistance and the reference discharge current in the embodiments of the present disclosure.
And step 103, determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state.
It is understood that the ambient temperature, the state of charge of the battery, and the state of health of the battery all affect the internal dc resistance of the battery. In the embodiment of the disclosure, the current direct current internal resistance of the battery is determined according to the ambient temperature, the battery charge state and the battery health state, and can be realized in any possible way.
For example, a machine learning model may be established, through which the input ambient temperature, battery state of charge, and battery state of health are parsed to determine the current battery dc internal resistance.
Alternatively, a mapping relationship between the ambient temperature, the battery state of charge, the battery state of health, and the battery internal dc resistance may be established. The battery direct current internal resistance corresponding to the ambient temperature, the battery charge state and the battery health state under any condition can be inquired or calculated through the mapping relation.
For example, when the battery state of health is SOH1, the ambient temperature is T1, and the battery state of charge is SOC1, the corresponding internal DC resistance of the battery can be determined to be R 111 . When the battery state of health is SOH1, the ambient temperature is T1, and the battery state of charge is SOC2, the corresponding battery DC internal resistance can be determined to be R 112 . When the battery state of health is SOH1, the ambient temperature is T2, and the battery state of charge is SOC2, the corresponding battery DC internal resistance can be determined to be R 122 。
It should be noted that the foregoing examples are only illustrative, and are not intended to limit the determination of the current dc internal resistance of the battery in the embodiments of the present disclosure.
Step 104, determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current.
The battery direct current internal resistance and the reference direct current internal resistance are determined under the same environment temperature and battery charge state. Therefore, according to the magnitude relation between the battery direct current internal resistance and the reference discharge current corresponding to the reference direct current internal resistance, the discharge current corresponding to the current battery direct current internal resistance can be determined, and then the battery discharge capacity can be estimated.
For example, the ratio of the reference dc internal resistance to the battery dc internal resistance may be used as a scaling factor, the product of the reference discharge current and the scaling factor may be used as a discharge current corresponding to the battery dc internal resistance, and the discharge current may be used to characterize the discharge capacity of the battery.
The current intensity required for the battery to discharge its rated capacity for a predetermined period of time may be referred to as a discharge rate. The discharge rate is a measure of how fast the discharge is, and is numerically equal to a multiple of the rated capacity of the battery, i.e. "discharge current/rated capacity of the battery=discharge rate".
Thus, in embodiments of the present disclosure, the discharge capacity of a battery may also be characterized by the discharge rate. Specifically, the discharge capacity of the battery can be determined according to the ratio of the discharge current corresponding to the current direct-current internal resistance of the battery to the rated capacity of the battery.
In the embodiment of the disclosure, the current ambient temperature, the battery state of charge and the battery state of health are firstly obtained; then determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and the reference health state; then determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state; and finally, determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current. The method and the device determine the direct current internal resistance of the battery based on the ambient temperature, the battery state of charge and the battery state of health, and determine the current discharge capacity of the battery according to the current direct current internal resistance of the battery, the reference direct current internal resistance under the reference state of health and the reference discharge current, thereby realizing accurate assessment of the discharge capacity of the battery in the use process and providing a reliable basis for intelligent management and maintenance of the battery.
Fig. 2 is a flowchart illustrating a method for evaluating battery discharge capacity according to another embodiment of the present disclosure. As shown in fig. 2, the method for evaluating the discharge capacity of the battery may include the steps of:
step 201, obtaining the current ambient temperature, battery state of charge and battery state of health.
It should be noted that, for a specific implementation manner of step 201, reference may be made to the detailed description of other embodiments of the present disclosure, which is not repeated herein.
Step 202, determining a first mapping relationship between the ambient temperature, the state of charge and the internal resistance of the direct current corresponding to the reference health state.
The reference state of health may be the state of health of a completely new battery, i.e. 100% soh. Under the reference health state, different environment temperatures and different charge states respectively correspond to different direct current internal resistances.
For example, the ambient temperature may be-20 ℃, -10 ℃, 0 ℃, 10 ℃, 25 ℃, 45 ℃, etc. The state of charge may be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% etc.
The first mapping relation can determine the direct current internal resistance under a certain environment temperature and a certain charge state. In the embodiment of the present disclosure, the first mapping relationship may be any possible implementation form.
For example, the first mapping relationship may be a mapping function between the ambient temperature, the state of charge, and the internal dc resistance. Alternatively, the first mapping relationship may be a mapping table between the ambient temperature, the state of charge, and the internal dc resistance, which is not limited in the present disclosure.
Step 203, determining a reference dc internal resistance according to the ambient temperature, the battery state of charge and the first mapping relationship.
For example, when the first mapping relationship is a mapping function between the ambient temperature, the state of charge and the direct current internal resistance, the ambient temperature and the state of charge can be used as the input of the mapping function, the direct current internal resistance is used as the output of the mapping function, and the direct current internal resistance of the battery corresponding to the current ambient temperature and the state of charge of the battery is obtained through calculation.
Or when the first mapping relation is a mapping table between the ambient temperature, the state of charge and the direct current internal resistance, the current ambient temperature and the state of charge of the battery can be used as preconditions to search the corresponding direct current internal resistance of the battery.
Step 204, determining a second mapping relationship between the ambient temperature, the state of charge and the discharge current corresponding to the reference health status.
It will be appreciated that in the reference health state, different ambient temperatures and different states of charge correspond to different discharge currents, respectively.
For example, when the ambient temperature is 10 ℃ and the state of charge is 50% soc, or when the ambient temperature is 10 ℃ and the state of charge is 80% soc, or when the ambient temperature is 25 ℃ and the state of charge is 50% soc, the discharge currents of the batteries are different.
The second mapping relation can determine the discharge current corresponding to a certain ambient temperature and a certain state of charge under the reference health state. In the embodiment of the disclosure, the second mapping relationship may be any possible implementation form.
For example, the second mapping may be a mapping function between ambient temperature, state of charge, and discharge current. Alternatively, the first mapping relationship may be a mapping table between ambient temperature, state of charge, and discharge current, which is not limited in this disclosure.
Step 205, determining a reference discharge current according to the ambient temperature, the battery state of charge and the second mapping.
For example, when the second mapping relationship is a mapping function between the ambient temperature, the state of charge and the discharge current, the ambient temperature and the state of charge can be used as the input of the mapping function, the discharge current is used as the output of the mapping function, and the reference discharge current corresponding to the current ambient temperature and the current state of charge of the battery is obtained through calculation.
Or when the first mapping relation is a mapping table between the ambient temperature, the state of charge and the discharge current, the current ambient temperature and the state of charge of the battery can be used as preconditions to search the corresponding reference discharge current.
Step 206, determining a third mapping relationship between the environmental temperature, the state of charge and the internal resistance of the direct current corresponding to the battery state of health.
It should be noted that the battery state of health may be a state of health of the battery at any time during the use process. For example, the battery state of health may be 95% soh, 90% soh, 85% soh, 80% soh, etc. Under the current battery health state, different environment temperatures and different charge states respectively correspond to different direct current internal resistances.
The third mapping relationship can determine a discharge current corresponding to a certain ambient temperature and a certain state of charge in the current battery state of health. In the embodiment of the disclosure, the third mapping relationship may be any possible implementation form.
For example, the third mapping relationship may be a mapping function between the ambient temperature, the state of charge, and the internal dc resistance. Alternatively, the third mapping relationship may be a mapping table between the ambient temperature, the state of charge, and the internal dc resistance, which is not limited in the present disclosure.
Step 207, determining the battery direct current internal resistance according to the ambient temperature, the battery state of charge and the third mapping relation.
It should be noted that, the specific implementation manner of determining the dc internal resistance of the battery may refer to the detailed description of determining the reference dc internal resistance in the embodiments of the present disclosure, which is not described herein.
Step 208, determining the internal resistance increase rate according to the ratio of the battery direct current internal resistance to the reference direct current internal resistance.
It is understood that the battery gradually ages as the number of charge and discharge increases. The dc internal resistance of the battery may gradually increase.
The battery direct current internal resistance and the reference direct current internal resistance are determined under the same environment temperature and battery charge state. Therefore, the internal resistance increase rate of the battery can be determined according to the ratio of the battery direct current internal resistance to the reference direct current internal resistance.
Step 209, determining the battery discharging capability according to the ratio of the reference discharging current to the internal resistance increasing rate.
It is understood that the internal dc resistance of the battery can affect the discharge current of the battery, and thus the discharge capacity of the battery. Therefore, the discharge current corresponding to the current battery direct current internal resistance can be determined according to the reference discharge current corresponding to the reference direct current internal resistance and the internal resistance increase rate, and the discharge capacity of the battery can be further evaluated.
In the embodiment of the disclosure, the ratio of the reference discharge current to the internal resistance increase rate can be used as the discharge current corresponding to the direct current internal resistance of the battery, and the discharge capacity of the battery is represented by the discharge current.
In the embodiment of the disclosure, according to a first mapping relation between an ambient temperature corresponding to a reference health state, a state of charge and a direct current internal resistance, determining a current ambient temperature and a reference direct current internal resistance corresponding to a battery state of charge; determining the current ambient temperature and the reference discharge current corresponding to the battery state of charge according to the second mapping relation of the ambient temperature, the state of charge and the discharge current corresponding to the reference state of health, determining the current ambient temperature and the battery direct current internal resistance corresponding to the battery state of charge according to the third mapping relation of the ambient temperature, the state of charge and the direct current internal resistance corresponding to the battery state of health, and finally determining the current battery discharge capacity based on the battery direct current internal resistance, the reference direct current internal resistance and the reference discharge current. Therefore, the quick evaluation of the discharge capacity of the battery in the use process of the battery is realized, a large number of tests when the battery is attenuated to a certain degree are avoided, and the real-time performance and accuracy of the evaluation of the discharge capacity of the battery in the use process are effectively improved.
Fig. 3 is a flowchart illustrating a first mapping relationship between an ambient temperature, a state of charge, and a dc internal resistance corresponding to a reference health state in an embodiment of the disclosure. As shown in fig. 3, the method may include the steps of:
in step 301, a plurality of test environment temperatures and a plurality of test states of charge corresponding to the reference state of health are determined.
In order to determine the direct current internal resistances corresponding to different environment temperatures and different states of charge respectively in the reference health state, a plurality of test environment temperatures and a plurality of test states of charge may be set.
For example, the test environment temperature may be-20 ℃, -10 ℃, 0 ℃, 10 ℃, 25 ℃, 45 ℃, etc. The test state of charge may be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% etc.
Step 302, obtaining a discharge current from the initial voltage of the first sample battery in the reference state of health to the cut-off voltage within a set time under any test environment temperature and any test state of charge, wherein the cut-off voltage is greater than the discharge end voltage of the first sample battery.
The reference state of health is the state of health of the whole new battery, namely 100% soh. Thus, the first sample cell may be a number of entirely new cells. The first sample cells may be grouped according to the set test state of charge. The state of charge of each set of sample cells corresponds to a test state of charge, respectively.
For example, the states of charge of the first set of sample cells are 10% soc, the states of charge of the second set of sample cells are 20% soc, the states of charge of the third set of sample cells are 30% soc, and so on, until each test state of charge has a corresponding sample cell.
Further, each sample cell may be discharged using a discharge device at each test ambient temperature, and a discharge current at which the initial voltage of the sample cell drops to a cut-off voltage within a set time may be determined.
The initial voltage is the voltage when the battery starts to discharge, and the cut-off voltage is the voltage when the battery ends to discharge. Due to the chemical characteristics of the battery, the voltage of the battery gradually decreases during discharging, and the discharging time is longer when the discharging current is smaller; the discharge time is shorter as the discharge current is larger.
For convenience of comparison data, the discharge time of the sample cell may be uniformly set, for example, 10s, 30s, 60s, etc. Meanwhile, the cut-off voltage when the sample battery stops discharging is uniformly set. Wherein the cutoff voltage may be greater than a discharge termination voltage of the first sample cell.
The term "end voltage" refers to a value at which the voltage drops to a minimum operating voltage at which the battery is not suitable for further discharge. In the embodiment of the disclosure, the cut-off voltage can float a certain range on the basis of the termination voltage. For example, the cut-off voltage may be 0.1V, 0.3V, 0.5V, or the like, which is not limited by the present disclosure.
Step 303, determining any test environment temperature and any reference dc internal resistance corresponding to the test state of charge according to the initial voltage, the cut-off voltage and the discharge current of the first sample battery.
For each first sample cell, the corresponding initial voltage and cut-off voltage can be differentiated, and the voltage difference is divided by the discharge current to obtain the corresponding test direct current internal resistance.
Furthermore, the multiple test direct current internal resistances under the same test environment temperature and the same test charge state can be fused according to the test condition of each first sample battery so as to determine any test environment temperature and the reference direct current internal resistance corresponding to any test charge state.
For example, when the test environment temperature is T1 and the test state of charge is SOC1, the plurality of test DC internal resistances are R 1 ，R 2 ，……，R n . Wherein the method comprises the steps ofN is the number of the tested direct current internal resistances. The reference DC internal resistance under the test condition can be (R) 1 +R 2 +……+R n ) And/n. Alternatively, the reference dc internal resistance under the test condition may be a median of the respective test dc internal resistances.
It should be noted that the foregoing examples are only illustrative, and should not be taken as limiting the reference dc internal resistance in the embodiments of the present disclosure.
In addition, a plurality of discharge currents under the same test environment temperature and the same test charge state can be fused to determine any test environment temperature and any discharge current corresponding to the test charge state, so as to form a second mapping relation.
In the embodiment of the disclosure, a plurality of testing environment temperatures and a plurality of testing charge states corresponding to a reference health state are firstly determined; then, acquiring a discharge current of the initial voltage of the first sample battery in a reference health state falling to a cut-off voltage within a set time under any test environment temperature and any test charge state; and finally, determining any test environment temperature and any reference direct current internal resistance corresponding to the test state of charge according to the initial voltage, the cut-off voltage and the discharge current of the first sample battery. Therefore, the reference direct current internal resistance under different test conditions is obtained, and support and basis are provided for realizing discharge capacity evaluation of the battery in the use process.
Fig. 4 is a flowchart illustrating a third mapping relationship between an ambient temperature, a state of charge, and a dc internal resistance corresponding to a battery state of health according to an embodiment of the disclosure. As shown in fig. 4, the method may include the steps of:
Step 401, determining a capacity fade coefficient according to a ratio of the battery state of health to the reference state of health.
The battery state of health may be a state of health of the battery at any time during use. For example, the battery state of health may be 95% soh, 90% soh, 85% soh, 80% soh, etc.
For example, the current battery state of health is 90% SOH and the reference state of health is 100% SOH, then the capacity fade coefficient is 0.9. Alternatively, the current battery state of health is 80% SOH and the reference state of health is 100% SOH, then the capacity fade coefficient is 0.8.
Step 402, determining an internal resistance test current according to the product of the discharge current corresponding to any test ambient temperature and any test state of charge and the capacity fading coefficient.
When determining the first mapping relation of the ambient temperature, the state of charge and the direct current internal resistance corresponding to the reference health state, the discharge current corresponding to any test ambient temperature and any test state of charge under the reference health state can be obtained.
Further, the product of the discharge current and the capacity fade coefficient can be used as the internal resistance test current corresponding to the current battery health state under the same test conditions.
Step 403, obtaining the initial voltage and the cut-off voltage of the second sample battery under the battery state of health at any test ambient temperature and any test state of charge.
Wherein the second sample battery may comprise several groups of aged batteries in different battery states of health. For example, an aged battery having a battery state of health of 95% soh, an aged battery having a battery state of health of 90% soh, and the like.
According to the set test charge states, the sample batteries in the same battery state of health can be further divided, and each test charge state corresponds to a group of sample batteries respectively.
For example, among the sample cells having a battery state of health of 95% soh, the sample cells having a state of charge of 10% soc, the sample cells having a state of charge of 20% soc, the sample cells having a state of charge of 30% soc, and so on, are included until each test state of charge has a corresponding sample cell.
It should be noted that, the battery voltage and the state of charge have a certain correspondence. From the state of charge of the sample cell, its corresponding initial voltage can be determined. Alternatively, the initial voltage of the sample cell may be determined by a voltage detection device
From the discharge end voltage of the sample cell, its corresponding cut-off voltage can be determined. Wherein the cutoff voltage may be greater than a discharge termination voltage of the first sample cell. For example, the cut-off voltage may be 0.1V, 0.3V, 0.5V, or the like, which is not limited by the present disclosure.
Step 404, determining any test environment temperature and any battery direct current internal resistance corresponding to the test state of charge according to the initial voltage, the cut-off voltage and the internal resistance test current of the second sample battery.
For each second sample cell, the corresponding initial voltage and cut-off voltage can be differentiated, and the voltage difference is divided by the internal resistance test current to obtain the corresponding direct current internal resistance.
Furthermore, the multiple direct current internal resistances under the same test environment temperature and the same test charge state can be fused to determine any test environment temperature and the corresponding battery direct current internal resistance under any test charge state.
For example, a plurality of dc internal resistances under the same test conditions may be averaged as the battery dc internal resistance. Alternatively, the median of the dc internal resistances under the same test conditions may be used as the battery dc internal resistance.
It should be noted that the foregoing examples are only illustrative, and should not be taken as limiting the dc internal resistance of the battery in the embodiments of the present disclosure.
In the embodiment of the disclosure, firstly, a capacity attenuation coefficient is determined according to the ratio of the battery health state to the reference health state, and then an internal resistance test current is determined according to the product of any test environment temperature and the discharge current corresponding to any test state of charge and the capacity attenuation coefficient; then, acquiring initial voltage and cut-off voltage of a second sample battery in a battery health state under any test environment temperature and any test charge state; and finally, determining any test environment temperature and any battery direct current internal resistance corresponding to the test state of charge according to the initial voltage, the cut-off voltage and the internal resistance test current of the second sample battery. Therefore, the direct current internal resistance of the battery under different test conditions is obtained, and support and basis are provided for realizing the discharge capacity evaluation of the battery in the use process.
In order to implement the above embodiment, the present disclosure also proposes an evaluation device for the discharge capacity of a battery.
Fig. 5 is a schematic structural diagram of a device for evaluating battery discharge capability according to an embodiment of the present disclosure.
As shown in fig. 5, the battery discharge capacity evaluation apparatus 100 may include: the acquisition module 110, the first determination module 120, the second determination module 130, and the third determination module 140.
The acquiring module 110 is configured to acquire a current ambient temperature, a battery state of charge, and a battery state of health;
a first determining module 120, configured to determine a reference dc internal resistance and a reference discharge current according to an ambient temperature, a battery state of charge, and a reference health state;
a second determining module 130, configured to determine a current dc internal resistance of the battery according to the ambient temperature, the battery state of charge, and the battery state of health;
the third determining module 140 is configured to determine the current discharging capability of the battery according to the dc internal resistance of the battery, the reference dc internal resistance and the reference discharging current.
The functions and specific implementation principles of the foregoing modules in the embodiments of the present disclosure may refer to the foregoing method embodiments, and are not repeated herein.
The device for evaluating the battery discharging capacity of the embodiment of the disclosure firstly acquires the current ambient temperature, the battery charge state and the battery health state; then determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and the reference health state; then determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state; and finally, determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current. The method and the device determine the direct current internal resistance of the battery based on the ambient temperature, the battery state of charge and the battery state of health, and determine the current discharge capacity of the battery according to the current direct current internal resistance of the battery, the reference direct current internal resistance under the reference state of health and the reference discharge current, thereby realizing accurate assessment of the discharge capacity of the battery in the use process and providing a reliable basis for intelligent management and maintenance of the battery.
In one possible implementation, the first determining module is configured to:
determining a first mapping relation of the ambient temperature, the state of charge and the direct-current internal resistance corresponding to the reference health state;
determining a reference direct current internal resistance according to the ambient temperature, the battery state of charge and the first mapping relation;
determining a second mapping relation of the environmental temperature, the state of charge and the discharge current corresponding to the reference health state;
and determining a reference discharge current according to the ambient temperature, the battery charge state and the second mapping relation.
In one possible implementation, the second determining module is configured to:
determining a third mapping relation of the environment temperature, the state of charge and the direct current internal resistance corresponding to the battery health state;
and determining the direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the third mapping relation.
In one possible implementation manner, the first mapping relationship between the ambient temperature, the state of charge and the internal dc resistance corresponding to the health state is determined by the following method:
determining a plurality of test environment temperatures and a plurality of test charge states corresponding to the reference health state;
acquiring a discharge current of the initial voltage of the first sample battery in a reference health state falling to a cut-off voltage within a set time under any test environment temperature and any test charge state, wherein the cut-off voltage is larger than a discharge termination voltage of the first sample battery;
And determining any test environment temperature and any reference direct current internal resistance corresponding to the test state of charge according to the initial voltage, the cut-off voltage and the discharge current of the first sample battery.
In one possible implementation, the third mapping relationship between the ambient temperature, the state of charge, and the internal dc resistance corresponding to the state of health of the battery is determined by:
determining a capacity fading coefficient according to the ratio of the battery health state to the reference health state;
determining an internal resistance test current according to the product of any test environment temperature and the discharge current corresponding to any test state of charge and the capacity attenuation coefficient;
acquiring initial voltage and cut-off voltage of a second sample battery in a battery state of health under any test environment temperature and any test state of charge;
and determining any test environment temperature and the battery direct current internal resistance corresponding to any test state of charge according to the initial voltage, the cut-off voltage and the internal resistance test current of the second sample battery.
In one possible implementation, the third determining module is configured to:
determining an internal resistance increase rate according to the ratio of the direct current internal resistance of the battery to the reference direct current internal resistance;
and determining the discharge capacity of the battery according to the ratio of the reference discharge current to the internal resistance increase rate.
The functions and specific implementation principles of the foregoing modules in the embodiments of the present disclosure may refer to the foregoing method embodiments, and are not repeated herein.
Fig. 6 illustrates a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the present disclosure. The electronic device 600 shown in fig. 6 is merely an example and should not be construed to limit the functionality and scope of use of embodiments of the present disclosure in any way.
As shown in fig. 6, the electronic device 600 may include one or more of the following components: a processing component 602, a memory 604, a power component 606, a multimedia component 608, an audio component 610, an input/output (I/O) interface 612, a sensor component 614, and a communication component 616.
The processing component 602 generally controls overall operation of the electronic device 600, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 602 may include one or more processors 620 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 602 can include one or more modules that facilitate interaction between the processing component 602 and other components. For example, the processing component 602 may include a multimedia module to facilitate interaction between the multimedia component 608 and the processing component 602.
The memory 604 is configured to store various types of data to support operations at the electronic device 600. Examples of such data include instructions for any application or method operating on the electronic device 600, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 604 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power supply component 606 provides power to the various components of the electronic device 600. The power supply components 606 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 600.
The multimedia component 608 includes a touch-sensitive display screen that provides an output interface between the electronic device 600 and a user. In some embodiments, the touch display screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or sliding action, but also the duration and pressure associated with the touch or sliding operation. In some embodiments, the multimedia component 608 includes a front camera and/or a rear camera. When the electronic device 600 is in an operational mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 610 is configured to output and/or input audio signals. For example, the audio component 610 includes a Microphone (MIC) configured to receive external audio signals when the electronic device 600 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 604 or transmitted via the communication component 616.
In some embodiments, audio component 610 further includes a speaker for outputting audio signals.
The I/O interface 612 provides an interface between the processing component 602 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 614 includes one or more sensors for providing status assessment of various aspects of the electronic device 600. For example, the sensor assembly 614 may detect an on/off state of the electronic device 600, a relative positioning of the components, such as a display and keypad of the electronic device 600, the sensor assembly 614 may also detect a change in position of the electronic device 600 or a component of the electronic device 600, the presence or absence of a user's contact with the electronic device 600, an orientation or acceleration/deceleration of the electronic device 600, and a change in temperature of the electronic device 600. The sensor assembly 614 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 614 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 614 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 616 is configured to facilitate communication between the electronic device 600 and other devices, either wired or wireless. The electronic device 600 may access a wireless network based on a communication standard, such as WiFi,2G, or 3G, or a combination thereof. In one exemplary embodiment, the communication component 616 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 616 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the electronic device 600 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.
In an exemplary embodiment, there is also provided a vehicle comprising an electronic device as set forth in the foregoing embodiment.
In an exemplary embodiment, a computer-readable storage medium is also provided, such as memory 604, including instructions executable by processor 620 of electronic device 600 to perform the above-described method. Alternatively, the computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
In an exemplary embodiment, a computer program product is also provided, comprising a computer program which, when executed by a processor, implements a method as before.
According to the technical scheme, the current environment temperature, the battery charge state and the battery health state are obtained; then determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and the reference health state; then determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state; and finally, determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current. The method and the device determine the direct current internal resistance of the battery based on the ambient temperature, the battery state of charge and the battery state of health, and determine the current discharge capacity of the battery according to the current direct current internal resistance of the battery, the reference direct current internal resistance under the reference state of health and the reference discharge current, thereby realizing accurate assessment of the discharge capacity of the battery in the use process and providing a reliable basis for intelligent management and maintenance of the battery.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present disclosure. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
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 at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified 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 specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present disclosure 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 embodiments of the present disclosure.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing 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 may even be paper or other suitable medium upon which the program is printed, as the program may 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 disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or part of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.
Furthermore, each functional unit in the embodiments of the present disclosure may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented as software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (12)
1. A method of evaluating the discharge capacity of a battery, comprising:
acquiring the current ambient temperature, the battery state of charge and the battery state of health;
determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery state of charge and a reference health state;
determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state;
and determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current.
2. The method of claim 1, wherein the determining a reference internal dc resistance and a reference discharge current based on the ambient temperature, the battery state of charge, and a reference state of health comprises:
Determining a first mapping relation of the ambient temperature, the state of charge and the direct current internal resistance corresponding to the reference health state;
determining the reference direct current internal resistance according to the ambient temperature, the battery state of charge and the first mapping relation;
determining a second mapping relation of the environmental temperature, the state of charge and the discharge current corresponding to the reference health state;
and determining the reference discharge current according to the ambient temperature, the battery charge state and the second mapping relation.
3. The method of claim 1, wherein said determining a current internal battery dc resistance based on said ambient temperature, said battery state of charge, and said battery state of health comprises:
determining a third mapping relation of the environment temperature, the state of charge and the direct current internal resistance corresponding to the battery health state;
and determining the direct current internal resistance of the battery according to the ambient temperature, the battery state of charge and the third mapping relation.
4. The method of claim 3, wherein the first mapping relationship between the ambient temperature, the state of charge, and the internal dc resistance corresponding to the reference health state is determined by:
Determining a plurality of test environment temperatures and a plurality of test charge states corresponding to the reference health state;
acquiring a discharge current of the initial voltage of the first sample battery in the reference health state falling to a cut-off voltage within a set time under any test environment temperature and any test charge state, wherein the cut-off voltage is larger than a discharge termination voltage of the first sample battery;
and determining the reference direct current internal resistance corresponding to any test environment temperature and any test state of charge according to the initial voltage, the cut-off voltage and the discharge current of the first sample battery.
5. The method of claim 4, wherein the second mapping relationship between the ambient temperature, the state of charge, and the internal dc resistance corresponding to the state of health of the battery is determined by:
determining a capacity fade coefficient according to the ratio of the battery state of health to the reference state of health;
determining an internal resistance test current according to the product of the discharge current corresponding to any test environment temperature and any test state of charge and the capacity attenuation coefficient;
acquiring initial voltage and cut-off voltage of a second sample battery in the battery state of health under any test environment temperature and any test state of charge;
And determining the battery direct current internal resistance corresponding to any test environment temperature and any test state of charge according to the initial voltage, the cut-off voltage and the internal resistance test current of the second sample battery.
6. The method of any of claims 1-5, wherein determining the current battery discharge capacity based on the battery dc internal resistance, the reference dc internal resistance, and the reference discharge current comprises:
determining an internal resistance increase rate according to the ratio of the battery direct current internal resistance to the reference direct current internal resistance;
and determining the discharge capacity of the battery according to the ratio of the reference discharge current to the internal resistance increase rate.
7. An evaluation device of discharge capacity of a battery, comprising:
the acquisition module is used for acquiring the current ambient temperature, the battery charge state and the battery health state;
the first determining module is used for determining a reference direct current internal resistance and a reference discharge current according to the ambient temperature, the battery charge state and a reference health state;
the second determining module is used for determining the current direct current internal resistance of the battery according to the ambient temperature, the battery charge state and the battery health state;
And the third determining module is used for determining the current battery discharging capacity according to the battery direct current internal resistance, the reference direct current internal resistance and the reference discharging current.
8. The apparatus of claim 7, wherein the third determination module is to:
determining an internal resistance increase rate according to the ratio of the battery direct current internal resistance to the reference direct current internal resistance;
and determining the discharge capacity of the battery according to the ratio of the reference discharge current to the internal resistance increase rate.
9. An electronic device comprising a memory, a processor, and computer instructions stored on the memory and executable on the processor, which when executed by the processor, implement the method of any of claims 1-6.
10. A vehicle comprising the electronic device of claim 9.
11. A computer readable storage medium storing computer instructions which, when executed by a processor, implement the method of any one of claims 1-6.
12. A computer program product comprising computer instructions which, when executed by a processor, implement the method of any of claims 1-6.
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| CN117706378A (en) * | 2024-02-05 | 2024-03-15 | 常州拜特测控技术有限公司 | Method, system and storage medium for testing charge and discharge performance of flow battery |
| CN117706378B (en) * | 2024-02-05 | 2024-05-31 | 常州拜特测控技术有限公司 | Method, system and storage medium for testing charge and discharge performance of flow battery |
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