CN111751737A - Self-discharge current calculation method, device and equipment of power battery and storage medium - Google Patents
Self-discharge current calculation method, device and equipment of power battery and storage medium Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention relates to the technical field of power batteries, and discloses a method, a device, equipment and a storage medium for calculating self-discharge current of a power battery, wherein the method comprises the following steps: when the vehicle is detected to be in a discharging mode, whether the vehicle is in a preset stable state or not is judged, if yes, battery information of a vehicle power battery when the duration of the preset stable state of the vehicle reaches the preset duration is obtained, whether the vehicle is in the preset stable state or not is judged, if not, a target battery tolerance is calculated according to the battery information, the self-discharging current of the vehicle power battery is calculated according to the target battery tolerance so as to achieve real-time accurate calculation of the self-discharging current of the vehicle power battery, the self-discharging state of the vehicle power battery is conveniently monitored in real time, the service life of the vehicle power battery is prolonged, and the phenomenon that the vehicle is powered off in advance due to over self-discharging of the vehicle power battery is avoided.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method, a device, equipment and a storage medium for calculating self-discharge current of a power battery.
Background
In the running process of the electric vehicle, the battery state of the power battery is one of the core factors of the normal running of the electric vehicle, and when the self-discharge phenomenon occurs in the power battery and the self-discharge degree exceeds the acceptable range, the remaining driving range of the vehicle is greatly reduced, and even the phenomenon of early power interruption may occur. The self-discharge current calculation method adopted by the prior art is mostly to calculate the self-discharge current of the battery according to the voltage drop of the battery in the time period from the awakening moment after the vehicle is in the static state to the next ignition moment, although the method is simple to operate, the method has the following three defects: 1) the self-discharge current can be calculated only after the vehicle is in a standing state, the self-discharge current cannot be calculated in the running process of the vehicle, and the execution probability is low; 2) the method is limited by the standing time of the vehicle after the vehicle is in the standing state, and if the standing time is too short, the accuracy of the method is greatly reduced; 3) the influence of the battery balance on the self-discharge of the power battery is not considered.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a storage medium for calculating self-discharge current of a power battery, and aims to solve the technical problem that the self-discharge current of the power battery cannot be accurately calculated in real time to monitor the self-discharge state of the power battery in the prior art.
In order to achieve the above object, the present invention provides a method for calculating a self-discharge current of a power battery, the method comprising the steps of:
when the vehicle is detected to be in a discharging mode, judging whether the vehicle is in a preset stable state or not;
if so, acquiring battery information of a vehicle power battery when the duration of the vehicle in the preset stable state reaches a preset duration;
judging whether the vehicle is in the preset stable state for the first time;
if not, calculating the target battery tolerance according to the battery information;
and calculating the self-discharge current of the vehicle power battery according to the target battery tolerance.
Preferably, before the step of determining whether the vehicle is in the preset stable state for the first time, the method further includes:
extracting a highest cell voltage and a lowest cell voltage of the battery from the battery information;
detecting whether a voltage difference value between the highest cell voltage of the battery and the lowest cell voltage of the battery is greater than a preset error voltage;
and if so, executing the step of judging whether the vehicle is in the preset stable state for the first time.
Preferably, if not, the step of calculating the target battery tolerance according to the battery information specifically includes:
if not, acquiring a target time node of the duration reaching the preset time;
acquiring the highest monomer capacity and the lowest monomer capacity of the target battery corresponding to the target time node through a preset open-circuit voltage parameter table according to the battery information;
and calculating a capacity difference value between the target battery highest monomer capacity and the target battery lowest monomer capacity, and taking the capacity difference value as a target battery tolerance.
Preferably, the step of calculating the self-discharge current of the vehicle power battery according to the target battery tolerance specifically includes:
taking a previous time node of the target time node as a preposed time node, and reading a preposed battery tolerance corresponding to the preposed time node;
acquiring battery balancing time of the vehicle power battery from the front time node to the target time node;
and calculating the self-discharge current of the vehicle power battery through a preset self-discharge current calculation formula according to the front battery tolerance, the target battery tolerance and the battery equalization time.
Preferably, the step of calculating the self-discharge current of the vehicle power battery according to the pre-battery tolerance, the target battery tolerance and the battery balancing time by using a preset self-discharge current calculation formula specifically includes:
calculating a self-discharge current of the vehicle power battery by the following formula according to the pre-battery tolerance, the target battery tolerance, and the battery equalization time,
in the formula InSelf-discharge current, T, for vehicle power batterynIs a target time node, Tn-1To a leading time node, Δ SOCnTo target cell tolerance, Δ SOCn-1To a pre-cell tolerance, C0Is the rated capacity of the battery, tnFor cell equalization time, I0The current is equalized for the preset battery.
Preferably, the step of taking a previous time node of the target time node as a previous time node and reading a previous battery tolerance corresponding to the previous time node specifically includes:
judging whether a previous time node of the target time node is an initial time node;
if so, acquiring an initial battery tolerance when the vehicle is in the preset stable state for the first time, and taking the initial battery tolerance as a front battery tolerance;
and if not, taking a previous time node of the target time node as a preposed time node, and reading a preposed battery tolerance corresponding to the preposed time node.
Preferably, if so, acquiring an initial battery tolerance when the vehicle is in the preset stable state for the first time, and taking the initial battery tolerance as a pre-battery tolerance, specifically including:
if so, acquiring the highest monomer capacity of the initial battery and the lowest monomer capacity of the initial battery, which are acquired through the preset open-circuit voltage parameter table according to the battery information when the vehicle is in the preset stable state for the first time;
and calculating a capacity difference value between the initial battery highest single capacity and the initial battery lowest single capacity, taking the capacity difference value as an initial battery tolerance, and taking the initial battery tolerance as a pre-battery tolerance.
In addition, to achieve the above object, the present invention further provides a self-discharge current calculation apparatus for a power battery, the apparatus including:
the state detection module is used for judging whether the vehicle is in a preset stable state or not when the vehicle is detected to be in a discharge mode;
the information acquisition module is used for acquiring battery information of a vehicle power battery when the duration of the vehicle in the preset stable state reaches a preset duration when the vehicle is in the preset stable state;
the stability judgment module is used for judging whether the vehicle is in the preset stable state for the first time;
the tolerance obtaining module is used for calculating the target battery tolerance according to the battery information when the vehicle is not in the preset stable state for the first time;
and the current acquisition module is used for calculating the self-discharge current of the vehicle power battery according to the target battery tolerance.
In addition, to achieve the above object, the present invention also provides a self-discharge current calculation apparatus for a power battery, the apparatus including: the self-discharge current calculation method comprises a memory, a processor and a self-discharge current calculation program of the power battery, wherein the self-discharge current calculation program of the power battery is stored on the memory and can run on the processor, and is configured to realize the steps of the self-discharge current calculation method of the power battery.
In addition, in order to achieve the above object, the present invention further provides a storage medium, on which a self-discharge current calculation program of a power battery is stored, and the self-discharge current calculation program of the power battery, when executed by a processor, implements the steps of the self-discharge current calculation method of the power battery as described above.
The invention judges whether the vehicle is in a preset stable state or not when detecting that the vehicle is in a discharging mode, acquires the battery information of the vehicle power battery when the duration of the vehicle in the preset stable state reaches the preset duration when the vehicle is in the preset stable state, judges whether the vehicle is in the preset stable state for the first time, calculates the target battery tolerance according to the battery information when the vehicle is not in the preset stable state for the first time, calculates the self-discharging current of the vehicle power battery according to the target battery tolerance, improves the execution probability of the self-discharging current calculation method of the power battery by acquiring the battery information of the vehicle power battery in the self-discharging state and reaching the preset stable state, increases the universality, and calculates the target battery tolerance according to the battery information, and then, the self-discharge current of the vehicle power battery is calculated according to the target battery tolerance so as to realize real-time accurate calculation of the self-discharge current of the vehicle power battery, so that the self-discharge state of the power battery can be monitored in real time conveniently, the service life of the vehicle power battery is prolonged, and the phenomenon of vehicle advanced power interruption caused by excessive self-discharge of the vehicle power battery is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a self-discharge current calculating device of a power battery in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for calculating a self-discharge current of a power battery according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a self-discharge current calculation method for a power battery according to a second embodiment of the present invention;
fig. 4 is a block diagram of a self-discharge current calculating device of a power battery according to a first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a self-discharge current calculation device of a power battery in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the self-discharge current calculation apparatus of the power battery may include: the processor 1001 includes, for example, a Central Processing Unit (CPU), a Vehicle Control Unit (VCU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the self-discharge current calculation device of the power cell, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a data storage module, a network communication module, a user interface module, and a self-discharge current calculation program of a power battery.
In the self-discharge current calculation device of the power battery shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the self-discharge current calculation device of the power battery of the present invention may be provided in the self-discharge current calculation device of the power battery, which calls the self-discharge current calculation program of the power battery stored in the memory 1005 through the processor 1001 and executes the self-discharge current calculation method of the power battery provided by the embodiment of the present invention.
An embodiment of the present invention provides a method for calculating a self-discharge current of a power battery, and referring to fig. 2, fig. 2 is a schematic flow diagram of a first embodiment of the method for calculating a self-discharge current of a power battery according to the present invention.
In this embodiment, the method for calculating the self-discharge current of the power battery includes the following steps:
step S10: when the vehicle is detected to be in a discharging mode, judging whether the vehicle is in a preset stable state or not;
it is easy to understand that the execution subject of this embodiment is a Vehicle Control Unit (VCU), and when detecting that a Vehicle is in a discharging mode, the Vehicle control unit determines whether the Vehicle is in a preset stable state, where the discharging mode may be a preset discharging function of the Vehicle, or may determine that the Vehicle is in a discharging mode when detecting that a power battery of the Vehicle is in a self-discharging state, where a criterion of the preset stable state is that a battery current of the power battery of the Vehicle is continuously in a preset current range within a preset time period, and a fluctuation error of the battery current is continuously smaller than a preset current error, for example, when setting the preset time period to one minute, setting the preset current range to [0, 5] a, setting the preset current error to ± 1A, and detecting that the battery current is in a current range of 2.5A to 3.0A within one minute, since 2.5A to 3.0A belong to the preset current range of [0, 5] a, 3.0A to 2.5A is 0.5A, and 0.5V is less than 1A, it can be determined that the vehicle is in the preset stable state within the minute, in a specific implementation, the reading of the battery current is real-time, and therefore, the battery current is compared with the battery current of the previous time node for the most part, if it is detected that the battery current of a certain time node belongs to [0, 5] a and the absolute value of the difference value between the battery current of the previous time node and the battery current of the current node is less than 1A, it can be determined that the time node belongs to the preset stable state, and the battery currents of all time nodes continuously acquired within one minute all meet the above conditions, it can be determined that the vehicle is in the preset stable state within the minute.
Step S20: if so, acquiring battery information of a vehicle power battery when the duration of the vehicle in the preset stable state reaches a preset duration;
it is easy to understand that after the vehicle enters the preset stable state, the vehicle controller needs to acquire the battery information of the vehicle power battery when the duration of the preset stable state reaches the preset duration, if the preset duration is set to be one minute, the vehicle controller acquires the battery information of the vehicle power battery of the time node at the end of one minute when the vehicle is continuously in the preset stable state, and the battery information includes the highest cell voltage of the battery, the lowest cell voltage of the battery and the lowest cell temperature of the battery.
Step S30: judging whether the vehicle is in the preset stable state for the first time;
it should be noted that before determining whether the vehicle is in the preset stable state for the first time, it is further required to extract a highest cell voltage of the battery and a lowest cell voltage of the battery from the battery information, detect whether a voltage difference between the highest cell voltage of the battery and the lowest cell voltage of the battery is greater than a preset error voltage, and determine whether the vehicle is in the preset stable state for the first time when the voltage difference is greater than the preset error voltage, for example, the preset error voltage is set to 8mV, and when the highest cell voltage of the battery is detected to be 3.322V, the lowest cell voltage of the battery is 3.301V, and the voltage difference is 3.322V-3.301V, which is 21mV > 8mV, it may be further determined whether the vehicle is in the preset stable state for the first time.
Step S40: if not, calculating the target battery tolerance according to the battery information;
it should be noted that, when the vehicle is not in the preset stable state for the first time, a target time node when the duration reaches the preset time is obtained, if the preset time is set to one minute, the target time node is the time node when the vehicle is in the preset stable state and is not in the last minute of the preset stable state for the first time, the time node is used as the target time node, and then the target battery tolerance is calculated through a preset open-circuit voltage parameter table according to the highest cell voltage of the battery, the lowest cell voltage of the battery and the lowest cell temperature of the battery in the battery information.
Step S50: and calculating the self-discharge current of the vehicle power battery according to the target battery tolerance.
It is easy to understand that, when the target battery tolerance is obtained, the battery tolerance of a previous time node of the target time node can be obtained, and then the self-discharge current of the vehicle power battery from the previous time node to the target time node is calculated through a preset self-discharge current calculation formula according to the target battery tolerance and the battery tolerance of the previous time node.
The embodiment judges whether the vehicle is in a preset stable state or not when detecting that the vehicle is in a discharging mode, acquires the battery information of the vehicle power battery when the duration of the vehicle in the preset stable state reaches the preset duration when the vehicle is in the preset stable state, judges whether the vehicle is in the preset stable state for the first time, calculates the target battery tolerance according to the battery information when the vehicle is not in the preset stable state for the first time, calculates the self-discharging current of the vehicle power battery according to the target battery tolerance, improves the execution probability of the self-discharging current calculation method of the power battery by acquiring the battery information of the vehicle power battery in the self-discharging state and reaching the preset stable state, increases the universality, and calculates the target battery tolerance according to the battery information, and then the self-discharge current of the vehicle power battery is calculated according to the target battery tolerance so as to realize the real-time calculation of the self-discharge current of the vehicle power battery, thereby being convenient for monitoring the self-discharge state of the power battery in real time, prolonging the service life of the vehicle power battery and avoiding the occurrence of the phenomenon of vehicle early power interruption caused by over self-discharge of the vehicle power battery.
Referring to fig. 3, fig. 3 is a schematic flow chart of a self-discharge current calculation method of a power battery according to a second embodiment of the present invention.
Based on the first embodiment described above, in the present embodiment, the step S40 includes:
step S401: if not, acquiring a target time node of the duration reaching the preset time;
step S402: acquiring the highest monomer capacity and the lowest monomer capacity of the target battery corresponding to the target time node through a preset open-circuit voltage parameter table according to the battery information;
step S403: and calculating a capacity difference value between the target battery highest monomer capacity and the target battery lowest monomer capacity, and taking the capacity difference value as a target battery tolerance.
It should be noted that, when the vehicle is not in the preset stable state for the first time, a target time node when the duration reaches the preset time is obtained, if the preset time is set to one minute, the target time node is the time node when the vehicle is in the preset stable state and is not in the last minute of the preset stable state for the first time, and the time node is taken as the target time node and is further based on the highest cell voltage V of the battery in the battery informationmaxThe lowest cell voltage V of the batteryminAnd the lowest cell temperature T of the batteryminAcquiring a target battery optimum corresponding to the target time node through a preset open circuit voltage parameter tableHigh cell capacity SOCmaxAnd target battery minimum cell capacity SOCminCalculating a capacity difference value between the target battery highest monomer capacity and the target battery lowest monomer capacity, and taking the capacity difference value as a target battery tolerance, if the vehicle is detected to enter the preset stable state for the 15 th time, wherein the V of the time node ismax＝3.322V，Vmin＝3.301V，TminThe vehicle control unit inquires a preset open circuit voltage parameter table to calculate the maximum single electric quantity SOC of the target battery of the time node at 24 DEG Cmax15.6%, target battery minimum single electric quantity SOCmin11.8%, the battery tolerance Δ SOC of this time node15＝SOCmax-SOCmin15.6% -11.8% ═ 3.8%, in a specific implementation, V obtainedmax，VminAnd TminThe SOC which is directly corresponding to the preset open-circuit voltage parameter table does not exist exactlymaxAnd SOCminAnd thus will be dependent on said Vmax，VminAnd TminFurther directional calculation is carried out on the adjacent data to obtain the corresponding SOCmaxAnd SOCminThe directional calculation may be an average calculation, a function extraction calculation, etc., the average calculation being based on the obtained data (V)max，VminAnd Tmin) Calculating corresponding average value from data at two adjacent ends of the value area corresponding to the preset open-circuit voltage parameter table, and using the average value as the target data (SOC)maxAnd SOCmin) Said function extraction being calculated as a function of said obtained data (V)max，VminAnd Tmin) Constructing an elementary function on data at two adjacent ends of a value area corresponding to a preset open-circuit voltage parameter table, and inputting the obtained data based on the constructed elementary function to obtain the solved target data (SOC)maxAnd SOCmin)。
Accordingly, in the present embodiment, the step S50 includes:
step S501: taking a previous time node of the target time node as a preposed time node, and reading a preposed battery tolerance corresponding to the preposed time node;
it should be noted that, in this embodiment, it may be determined whether a previous time node of the target time node is an initial time node, and when the previous time node of the target time node is the initial time node, an initial battery tolerance when the vehicle is in the preset stable state for the first time is obtained, and the initial battery tolerance is used as a pre-battery tolerance, in a specific implementation, the step of obtaining the initial battery tolerance may be: when a previous time node of a target time node is an initial time node, acquiring initial battery highest monomer capacity and initial battery lowest monomer capacity acquired by the vehicle in the preset stable state for the first time according to the battery information through the preset open-circuit voltage parameter table, calculating a capacity difference value between the initial battery highest monomer capacity and the initial battery lowest monomer capacity, taking the capacity difference value as an initial battery tolerance, and taking the initial battery tolerance as a front-end battery tolerance;
in a specific implementation, when the vehicle enters the preset stable state for the first time, it can be recorded that the time node at the moment is T1Inquiring a preset open circuit voltage parameter table according to the battery information of the time node to calculate the initial battery highest monomer electric quantity and the initial battery lowest monomer electric quantity of the time node, calculating a capacity difference value between the initial battery highest monomer capacity and the initial battery lowest monomer capacity, taking the capacity difference value as an initial battery tolerance, storing the initial battery tolerance by the vehicle control unit and recording T1And returning to the step S10 when the vehicle enters the preset stable state next time after the battery equalization time.
And when the previous time node of the target time node is not the initial time node, taking the previous time node of the target time node as a preposed time node, and reading the preposed battery tolerance corresponding to the preposed time node.
Step S502: acquiring battery balancing time of the vehicle power battery from the front time node to the target time node;
step S503: and calculating the self-discharge current of the vehicle power battery through a preset self-discharge current calculation formula according to the front battery tolerance, the target battery tolerance and the battery equalization time.
After a front battery tolerance corresponding to the front time node is read, battery balancing time of the vehicle power battery from the front time node to the target time node can be obtained, and then self-discharge current of the vehicle power battery is calculated through a preset self-discharge current calculation formula according to the front battery tolerance, the target battery tolerance and the battery balancing time.
In a specific implementation, the self-discharge current of the vehicle power battery may be calculated according to the pre-battery tolerance, the target battery tolerance, and the battery equalization time by the following formula,
in the formula InSelf-discharge current, T, for vehicle power batterynIs a target time node, Tn-1To a leading time node, Δ SOCnTo target cell tolerance, Δ SOCn-1To a pre-cell tolerance, C0Is the rated capacity of the battery, tnFor cell equalization time, I0The current is equalized for the preset battery.
For example, according to the above example, when the vehicle is detected to enter the preset stable state for the 15 th time, the time node is recorded as T15Calculating the battery tolerance delta SOC of the time node15＝SOCmax-SOCmin15.6% -11.8% >, 3.8%, and the whole vehicle controller stores the delta SOC15And reads the previous time node T14Battery tolerance Δ SOC14＝1.5％，T14～T15Battery equalization time t in time period1560h, rated capacity of battery C0Setting the battery balance current I as 200Ah0＝15mA，T15-T1480h, then time node T15Corresponding self-discharge current I15＝[(3.8％-1.5％)*200*1000+15*60]68.75mA,/80, T14～T15The average self-discharge current of the time period is 68.75mA, the self-discharge current threshold of the battery is set to be 50mA, and T14～T15The average self-discharge current of 68.75mA is more than 50mA in the time period, the self-discharge current exceeds the self-discharge current threshold value, namely the self-discharge current of the battery of the power battery of the node vehicle at the time is overlarge, the whole vehicle controller sends corresponding fault information to the user to remind the user to take corresponding maintenance measures to generate a fault diagnosis report, and the T can be continuously recorded15And further confirming the fault information and updating the fault diagnosis report by the balance time of the battery.
In this embodiment, when the vehicle is not in the preset stable state for the first time, a target time node when the duration reaches the preset time is obtained, the maximum monomer capacity and the minimum monomer capacity of the target battery corresponding to the target time node are obtained through a preset open-circuit voltage parameter table according to the battery information, a capacity difference value between the maximum monomer capacity and the minimum monomer capacity of the target battery is calculated, the capacity difference value is used as a target battery tolerance, a previous time node of the target time node is used as a previous time node, a previous battery tolerance corresponding to the previous time node is read, the battery balance time of the vehicle power battery from the previous time node to the target time node is obtained, and the vehicle dynamic state is calculated through a preset self-discharge current calculation formula according to the previous battery tolerance, the target battery tolerance and the battery balance time The self-discharge current of the power battery is further improved to further improve the accuracy of calculating the self-discharge current of the vehicle power battery, the accuracy of calculating the self-discharge current is improved by listing the preset battery balance current and the battery balance time related in the battery balance effect into the calculation variable of the self-discharge current, and whether fault information exists is judged based on the self-discharge current obtained through accurate calculation so that a user can process the fault of the vehicle power battery in time and the driving risk is reduced.
Furthermore, an embodiment of the present invention further provides a storage medium, where a self-discharge current calculation program of a power battery is stored, and when the self-discharge current calculation program of the power battery is executed by a processor, the steps of the self-discharge current calculation method of the power battery as described above are implemented.
Referring to fig. 4, fig. 4 is a block diagram of a self-discharge current calculating device of a power battery according to a first embodiment of the present invention.
As shown in fig. 4, a self-discharge current calculation apparatus for a power battery according to an embodiment of the present invention includes:
the state detection module 10 is configured to, when it is detected that a vehicle is in a discharge mode, determine whether the vehicle is in a preset stable state;
the information acquisition module 20 is configured to acquire, when the vehicle is in the preset stable state, battery information of a vehicle power battery when a duration of the vehicle in the preset stable state reaches a preset duration;
the stability judgment module 30 is configured to judge whether the vehicle is in the preset stable state for the first time;
a tolerance obtaining module 40, configured to calculate a target battery tolerance according to the battery information when the vehicle is not in the preset stable state for the first time;
and the current acquisition module 50 is used for calculating the self-discharge current of the vehicle power battery according to the target battery tolerance.
The embodiment judges whether the vehicle is in a preset stable state or not when detecting that the vehicle is in a discharging mode, acquires the battery information of the vehicle power battery when the duration of the vehicle in the preset stable state reaches the preset duration when the vehicle is in the preset stable state, judges whether the vehicle is in the preset stable state for the first time, calculates the target battery tolerance according to the battery information when the vehicle is not in the preset stable state for the first time, calculates the self-discharging current of the vehicle power battery according to the target battery tolerance, improves the execution probability of the self-discharging current calculation method of the power battery by acquiring the battery information of the vehicle power battery in the self-discharging state and reaching the preset stable state, increases the universality, and calculates the target battery tolerance according to the battery information, and then the self-discharge current of the vehicle power battery is calculated according to the target battery tolerance so as to realize the real-time calculation of the self-discharge current of the vehicle power battery, thereby being convenient for monitoring the self-discharge state of the power battery in real time, prolonging the service life of the vehicle power battery and avoiding the occurrence of the phenomenon of vehicle early power interruption caused by over self-discharge of the vehicle power battery.
Based on the first embodiment of the self-discharge current calculation device of the power battery, a second embodiment of the self-discharge current calculation device of the power battery is provided.
In this embodiment, the stability determining module 30 is further configured to extract a highest cell voltage and a lowest cell voltage of the battery from the battery information;
the stability determining module 30 is further configured to detect whether a voltage difference between the highest cell voltage of the battery and the lowest cell voltage of the battery is greater than a preset error voltage;
the stability determining module 30 is further configured to execute the operation of determining whether the vehicle is in the preset stable state for the first time when the voltage difference is greater than the preset error voltage.
The tolerance obtaining module 40 is further configured to obtain a target time node when the duration reaches the preset duration when the vehicle is not in the preset stable state for the first time;
the tolerance obtaining module 40 is further configured to obtain a target battery highest monomer capacity and a target battery lowest monomer capacity corresponding to the target time node through a preset open-circuit voltage parameter table according to the battery information;
the tolerance obtaining module 40 is further configured to calculate a capacity difference between the highest cell capacity of the target battery and the lowest cell capacity of the target battery, and use the capacity difference as a target battery tolerance.
The current obtaining module 50 is further configured to use a previous time node of the target time node as a previous time node, and read a previous battery tolerance corresponding to the previous time node;
the current obtaining module 50 is further configured to obtain a battery balancing time of the vehicle power battery from the lead time node to the target time node;
the current obtaining module 50 is further configured to calculate a self-discharge current of the vehicle power battery through a preset self-discharge current calculation formula according to the pre-battery tolerance, the target battery tolerance, and the battery balancing time.
The current obtaining module 50 is further configured to calculate a self-discharge current of the vehicle power battery according to the pre-battery tolerance, the target battery tolerance, and the battery balancing time by the following formula,
in the formula InSelf-discharge current, T, for vehicle power batterynIs a target time node, Tn-1To a leading time node, Δ SOCnTo target cell tolerance, Δ SOCn-1To a pre-cell tolerance, C0Is the rated capacity of the battery, tnFor cell equalization time, I0The current is equalized for the preset battery.
The current obtaining module 50 is further configured to determine whether a previous time node of the target time node is an initial time node;
the current obtaining module 50 is further configured to obtain an initial battery tolerance when the vehicle is in the preset stable state for the first time when the previous time node is the initial time node, and use the initial battery tolerance as a pre-battery tolerance;
the current obtaining module 50 is further configured to, when the previous time node is not the initial time node, use the previous time node of the target time node as a previous time node, and read a previous battery tolerance corresponding to the previous time node.
The current obtaining module 50 is further configured to, when the previous time node is the initial time node, obtain an initial maximum cell capacity and an initial minimum cell capacity of the battery, which are obtained through the preset open-circuit voltage parameter table according to the battery information when the vehicle is in the preset stable state for the first time;
the current obtaining module 50 is further configured to calculate a capacity difference between the initial highest cell capacity of the battery and the initial lowest cell capacity of the battery, use the capacity difference as an initial battery tolerance, and use the initial battery tolerance as a pre-battery tolerance.
Other embodiments or specific implementation manners of the self-discharge current calculation apparatus of the power battery of the invention may refer to the above method embodiments, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., a rom/ram, a magnetic disk, an optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A self-discharge current calculation method of a power battery is characterized by comprising the following steps:
when the vehicle is detected to be in a discharging mode, judging whether the vehicle is in a preset stable state or not;
if so, acquiring battery information of a vehicle power battery when the duration of the vehicle in the preset stable state reaches a preset duration;
judging whether the vehicle is in the preset stable state for the first time;
if not, calculating the target battery tolerance according to the battery information;
and calculating the self-discharge current of the vehicle power battery according to the target battery tolerance.
2. The method of claim 1, wherein said step of determining whether said vehicle is in said preset steady state for the first time is preceded by the step of:
extracting a highest cell voltage and a lowest cell voltage of the battery from the battery information;
detecting whether a voltage difference value between the highest cell voltage of the battery and the lowest cell voltage of the battery is greater than a preset error voltage;
and if so, executing the step of judging whether the vehicle is in the preset stable state for the first time.
3. The method of claim 1, wherein if not, the step of calculating the target battery tolerance based on the battery information specifically comprises:
if not, acquiring a target time node of the duration reaching the preset time;
acquiring the highest monomer capacity and the lowest monomer capacity of the target battery corresponding to the target time node through a preset open-circuit voltage parameter table according to the battery information;
and calculating a capacity difference value between the target battery highest monomer capacity and the target battery lowest monomer capacity, and taking the capacity difference value as a target battery tolerance.
4. The method according to claim 3, wherein the step of calculating the self-discharge current of the vehicle power battery based on the target battery tolerance comprises:
taking a previous time node of the target time node as a preposed time node, and reading a preposed battery tolerance corresponding to the preposed time node;
acquiring battery balancing time of the vehicle power battery from the front time node to the target time node;
and calculating the self-discharge current of the vehicle power battery through a preset self-discharge current calculation formula according to the front battery tolerance, the target battery tolerance and the battery equalization time.
5. The method according to claim 4, wherein the step of calculating the self-discharge current of the vehicle power battery according to the pre-battery tolerance, the target battery tolerance and the battery equalization time by a preset self-discharge current calculation formula specifically comprises:
calculating a self-discharge current of the vehicle power battery by the following formula according to the pre-battery tolerance, the target battery tolerance, and the battery equalization time,
in the formula InSelf-discharge current, T, for vehicle power batterynIs a target time node, Tn-1As a lead time node, △ SOCnTo target Battery tolerance, △ SOCn-1To a pre-cell tolerance, C0Is the rated capacity of the battery, tnFor cell equalization time, I0The current is equalized for the preset battery.
6. The method according to claim 4, wherein the step of using a previous time node of the target time node as a previous time node and reading a previous battery tolerance corresponding to the previous time node comprises:
judging whether a previous time node of the target time node is an initial time node;
if so, acquiring an initial battery tolerance when the vehicle is in the preset stable state for the first time, and taking the initial battery tolerance as a front battery tolerance;
and if not, taking a previous time node of the target time node as a preposed time node, and reading a preposed battery tolerance corresponding to the preposed time node.
7. The method according to claim 6, wherein if yes, the step of obtaining an initial battery tolerance when the vehicle is in the preset steady state for the first time, and using the initial battery tolerance as a pre-battery tolerance comprises:
if so, acquiring the highest monomer capacity of the initial battery and the lowest monomer capacity of the initial battery, which are acquired through the preset open-circuit voltage parameter table according to the battery information when the vehicle is in the preset stable state for the first time;
and calculating a capacity difference value between the initial battery highest single capacity and the initial battery lowest single capacity, taking the capacity difference value as an initial battery tolerance, and taking the initial battery tolerance as a pre-battery tolerance.
8. A self-discharge current calculation apparatus for a power battery, the apparatus comprising:
the state detection module is used for judging whether the vehicle is in a preset stable state or not when the vehicle is detected to be in a discharge mode;
the information acquisition module is used for acquiring battery information of a vehicle power battery when the duration of the vehicle in the preset stable state reaches a preset duration when the vehicle is in the preset stable state;
the stability judgment module is used for judging whether the vehicle is in the preset stable state for the first time;
the tolerance obtaining module is used for calculating the target battery tolerance according to the battery information when the vehicle is not in the preset stable state for the first time;
and the current acquisition module is used for calculating the self-discharge current of the vehicle power battery according to the target battery tolerance.
9. A self-discharge current calculation apparatus for a power battery, the apparatus comprising: memory, a processor and a self-discharge current calculation program of a power cell stored on the memory and executable on the processor, the self-discharge current calculation program of a power cell being configured to implement the steps of the self-discharge current calculation method of a power cell according to any one of claims 1 to 7.
10. A storage medium, characterized in that a self-discharge current calculation program of a power battery is stored on the storage medium, and when executed by a processor, the self-discharge current calculation program of a power battery realizes the steps of the self-discharge current calculation method of a power battery according to any one of claims 1 to 7.
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