CN110549900A - Parameter updating method and device for electric automobile and power battery after standing - Google Patents
Parameter updating method and device for electric automobile and power battery after standing Download PDFInfo
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- CN110549900A CN110549900A CN201810278615.9A CN201810278615A CN110549900A CN 110549900 A CN110549900 A CN 110549900A CN 201810278615 A CN201810278615 A CN 201810278615A CN 110549900 A CN110549900 A CN 110549900A
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
the invention discloses a method and a device for updating parameters after a power battery is placed still and an electric automobile, wherein the method for updating the parameters comprises the following steps: during the standing period of the power battery, acquiring the state information of the power battery once when the power battery is awakened; after the power battery is placed and stopped, acquiring the awakening times of the power battery, corresponding state information and the current SOC (state of charge) when the power battery is awakened each time, and acquiring the working mode of the power battery; calculating the reference SOC of the power battery according to the awakening times and the corresponding state information when the power battery is awakened each time; the current SOC of the power battery is updated according to the working mode of the power battery and the reference SOC of the power battery, so that the updated SOC of the power battery can reflect the real situation of the power battery as much as possible, and the situation that the SOC is inaccurate is avoided.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a parameter updating method after a power battery is placed still, a parameter updating device after the power battery is placed still and an electric automobile.
Background
Because the lithium ion power battery has the advantages of high working voltage, small volume, light weight, high energy density, no memory effect, low discharge rate, long cycle life and the like, the lithium ion power battery is widely applied to electric vehicles and energy storage systems.
Under the ideal condition, the lithium ion power battery can enter charge and discharge circulation uninterruptedly on both an electric automobile and an energy storage system so as to pursue the maximum investment-benefit ratio. In practical situations, some electric vehicles or Energy storage systems are parked for a certain time during operation, self-discharge and attenuation of the Battery occur during parking, and during the parking process and re-powering after parking, the BMS (Battery Management System) does not start a Battery parameter correction strategy, so that SOC (State of Charge), SOH (State of Health), SOE (State of Energy), SOP (State of Power), and RM (remaining Mileage) are inaccurate after long-time parking and re-powering, which brings about a certain trouble to customers.
In the related art, when correcting the SOC, there are two correction strategies of full-charge correction and power-feed correction, that is, when it is detected that the battery voltage reaches the full-charge or discharge cutoff voltage, the SOC is corrected to 100% and 0%, respectively. In fact, the correction is more to satisfy the visual perception that the instrument displays the SOC, rather than correcting the SOC more accurately in the true sense.
In addition, after the power battery is kept still for a period of time, a certain degree of self-discharge and capacity fading can occur. The self-discharge is mainly caused by that the conductivity of the electrolyte of the battery is low, the battery can continuously discharge with low current when the battery is in a standing state, and the capacity fading of the battery caused by the condition is reversible, and partial capacity lost can be recovered through charging. The capacity fade is mainly due to the fact that the thickening of the SEI film (Solid Electrolyte membrane) leads to the loss of active material, which is irreversible.
therefore, after the power battery is placed for a period of time, the battery capacity is attenuated to a certain degree, and the SOH needs to be corrected to a certain degree, but the conventional algorithm cannot start the SOH correction strategy after the power battery is placed for a period of time and comprises the steps of standing and then powering up again.
Therefore, after the power battery is kept still for a period of time, if the SOC and the SOH are not corrected in time, the corresponding SOE and RM cannot be corrected, and then the SOC jump with high probability and the RM inaccurate condition can occur along with the discharge of the power battery.
disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. To this end, an object of the present invention is to provide a method for updating parameters after a power battery is stationary, and to update state parameters of the power battery.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
the third purpose of the invention is to provide a parameter updating device after the power battery is placed still.
The fourth purpose of the invention is to provide an electric automobile.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for updating parameters after a power battery is placed still, including the following steps: during the standing period of the power battery, acquiring the state information of the power battery once when the power battery is awakened; after the power battery is placed and stopped, acquiring the awakening times of the power battery, corresponding state information and current SOC (state of charge) when the power battery is awakened each time, and acquiring the working mode of the power battery; calculating the reference SOC of the power battery according to the awakening times and the corresponding state information when the power battery is awakened each time; and updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery.
according to the parameter updating method after the power battery is placed, firstly, the state of charge of the power battery after the power battery is placed is calculated, namely the reference SOC, and then the current SOC of the power battery is updated in time according to the current working mode of the power battery and the reference SOC, so that the real situation of the power battery is reflected as much as possible, and the situation that the SOC is inaccurate is avoided.
Further, the present invention proposes a non-transitory computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the parameter updating method after the power battery is left standing of the above-described embodiment.
According to the non-transitory computer-readable storage medium of the embodiment of the invention, when the program corresponding to the parameter updating method after the power battery is placed still is executed, the updated SOC can reflect the real situation of the power battery as much as possible, and the situation that the SOC is inaccurate is avoided.
In order to achieve the above object, a third embodiment of the present invention provides a parameter updating apparatus after a power battery is placed still, including: the acquisition module is used for acquiring the state information of the power battery once when the power battery is awakened once during the standing period of the power battery; the first acquisition module is used for acquiring the awakening times of the power battery, corresponding state information when the power battery is awakened each time and the current SOC of the power battery after the power battery is placed; the second acquisition module is used for acquiring the working mode of the power battery; the calculation module is used for calculating the reference SOC of the power battery according to the awakened times and the corresponding state information when the power battery is awakened each time; and the updating module is used for updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery.
According to the parameter updating device after the power battery is placed, firstly, the state of charge of the power battery after the power battery is placed is calculated, namely the reference SOC, and then the current SOC of the power battery is updated in time according to the current working mode of the power battery and the reference SOC, so that the real situation of the power battery is reflected as much as possible, and the situation that the SOC is inaccurate is avoided.
Further, the invention provides an electric vehicle, which comprises the parameter updating device after the power battery is placed still in the embodiment.
according to the electric automobile provided by the embodiment of the invention, by adopting the parameter updating device after the power battery is placed still, the updated SOC can reflect the real situation of the power battery as much as possible, and the situation that the SOC is inaccurate is avoided.
Drawings
Fig. 1 is a flowchart of a parameter updating method after a power battery is stationary according to an embodiment of the invention;
Fig. 2 is a block diagram showing the configuration of a parameter updating apparatus after a power battery is left standing according to a first embodiment of the present invention;
Fig. 3 is a block diagram showing a parameter updating apparatus after the power battery is placed still according to a second embodiment of the present invention;
Fig. 4 is a block diagram showing the structure of a parameter updating apparatus after a power battery is placed still according to a third embodiment of the invention;
Fig. 5 is a block diagram showing the structure of a parameter updating device after a power battery is placed still according to a fourth embodiment of the invention;
Fig. 6 is a block diagram showing the structure of a parameter updating apparatus after a power battery is placed still according to a fifth embodiment of the invention;
Fig. 7 is a block diagram of an electric vehicle according to an embodiment of the present invention.
Detailed Description
reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a parameter updating method and device after the power battery is placed still, and an electric vehicle according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a parameter updating method after a power battery is stationary according to an embodiment of the invention. As shown in fig. 1, the parameter updating method after the power battery is placed still includes the following steps:
S101, during the standing period of the power battery, the state information of the power battery is collected once when the power battery is awakened once.
Specifically, a wake-up rule of the power Battery is preset, for example, when the power Battery starts to stand, the power Battery is woken up once every certain time, for example, every day, and then a BMS (Battery management System) wakes up the power Battery according to the wake-up rule, and collects state information of the power Battery at each wake-up time, including voltage, current, temperature, and the like of the power Battery.
optionally, the wake-up law may also be that the wake-up time interval for the power battery varies exponentially. For example, t ═ a × bxWherein t is a wake-up time interval, a and b are preset parameters and are constants, x is the wake-up times, namely, after the power battery is kept still for a time, the BMS wakes up the power battery for one time, and if the battery is kept still, the interval a is a time, b is a time interval2after time, the BMS wakes up the battery, and so on, with a time interval a b between the k-th wake and the (k-1) -th wakek。
S102, after the power battery is placed, acquiring the awakening times of the power battery, corresponding state information and the current SOC (state of charge) when the power battery is awakened each time, and acquiring the working mode of the power battery.
Specifically, when the power battery is placed at the end and enters the working mode (including a charging mode and a discharging mode) again, the BMS acquires the number of times the power battery is awakened during the placement and the state information of the power battery acquired each time the power battery is awakened, and also acquires the current SOC value of the power battery according to the current OCV (open Circuit Voltage) of the power battery and an SOC-OCV curve of the power battery prestored in the BMS and acquires the working mode of the power battery.
And S103, calculating the reference SOC of the power battery according to the awakening times and the corresponding state information when the power battery is awakened each time.
specifically, the reference SOC of the power battery is calculated by the following formula (1):
reference SOC (SOC) ═ SOCk＝m*(SOCk-1+ΔSOCSelf-discharge k)+n*SOCOCVk (1)
Wherein k is the accumulated awakening times of the power battery during the standing period, SOCk-1The SOC is the SOC when the power battery is awakened at the (k-1) th time in the standing stage, namely delta SOCSelf-discharge kThe SOC variation quantity caused by self-discharge of the power battery when the power battery is awakened at the k time, the SOCOCVkAnd m and n are weight coefficients, and m + n is 1.
Specifically, the BMS may be based on the formula SOCi＝m*(SOCi-1+ΔSOCSelf-discharge (i-1, i))+n*SOCOCViAnd sequentially calculating SOC values when the first time and the k time are awakened, wherein i is 1,2, … and k. As can be seen from this equation, the SOC of the power battery at the i-th wake-up time can be calculated from the SOC at the (i-1) -th wake-up time, and when i is 1, the SOC in the above equation0Namely the SOC value of the power battery at the static starting moment.
In addition, Δ SOC in the formula (1)Self-dischargeMay be obtained under laboratory conditions and pre-stored in the BMS, which may be represented by the formula Δ SOCSelf-discharge＝f(SOH、T、t、SOC0) And obtaining, wherein T is the current standing accumulated time of the power battery, and T is the temperature of the power battery collected every time the BMS wakes up the power battery. The values of the weight coefficients m and n depend on the accumulated standing time, the self-discharge degree, the health state and the static voltage in the standing stage of the power battery, that is, the values of m and n in each iterative operation are not fixed.
and S104, updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery.
Specifically, after the power battery is placed and placed, if the power battery enters a charging mode, updating the current SOC of the power battery according to a charging model and the reference SOC of the power battery; and if the power battery enters the discharging mode, updating the current SOC of the power battery according to the discharging model and the reference SOC of the power battery.
In one embodiment of the invention, if the reference SOC of the power battery is less than a first preset value, such as 20%, and the power battery enters a charging mode, such as when the electric vehicle is connected to an external charging device for constant current charging, and the charging rate is less than a preset rate, the BMS collects and records the total voltage, the total current, the cell voltage, the temperature and the charging time of the power battery, estimates the charging electric quantity through an ampere-hour integration algorithm, and generates a charging curve, i.e., voltage V-charging electric quantity QAhCurve line.
Further, for V-QAhThe peak height of the derivative curve of the curve is identified and judged. A charge start phase, in which the charge is in a LVP (Low Voltage Platform) phase; when the BMS detects that the first peak value is a positive inflection Point, namely LVTP (Low Voltage Transmission Point), the Voltage of the power battery is VLVTPAnd charged into the MVP (Medium Voltage Platform, Medium Voltage). In this process, i.e. VCut-off of discharge＜V＜VHVTPCan pass throughAnd updating the current SOC of the power battery.
When the second inflection Point, i.e. the HVTP (High Voltage Transition Point), is detected, the Voltage of the power battery is VHVTPThe current SOC is higher than the second preset value, such as 50%, according to the formulaCalculating the current SOC of the power battery, wherein Q0Is the total charge, Δ Q, of the power cell at the last full discharge at the same temperatureEqualizationthe SOC obtained by the ampere-hour integration method can be corrected according to the SOC at the moment.
As charging continues, the charging curve enters a final phase, the HVP (High Voltage Platform) phase, during which a pass-through equation is appliedAnd calculating the SOC of the power battery.
In other words, throughout the charging phase, the formula for updating the current SOC based on the charging model and the reference SOC is as follows:
it should be noted that, when the current SOC of the HVTP point is updated in the charging mode, if the difference between the SOC value calculated at the HVTP point and the SOC calculated according to the time integration method is greater than a threshold, the updating is performed in a stepwise manner to avoid the occurrence of SOC jump.
If the power battery enters the discharging mode, the current SOC of the power battery can be updated through an ampere-hour integration algorithm and a reference SOC.
in addition, it can be understood that when the power battery is fully charged, i.e. the voltage of the power battery reaches the full charge voltage V of the batterycut-off for chargingIn time, the SOC value of the power battery needs to be updated to 100 percent; when the voltage of the power battery reaches the cut-off voltage V of the batteryCut-off of dischargewhen the SOC value of the power battery needs to be updated to 0%.
in one embodiment of the invention, if the reference SOC of the power battery is greater than a first preset threshold value and the difference value between the reference SOC and the current SOC is greater than a preset difference value, the current SOC is updated according to the reference SOC according to a preset proportion.
Specifically, on the premise that the reference SOC is greater than the first preset voltage: when the power battery is in a charging mode, if the reference SOC is larger than the current SOC and the difference delta between the reference SOC and the current SOC is larger than a preset difference, updating the current SOC once every t/n time within a preset time t, wherein the updating rule is delta/n increase every time; when the power battery is in a charging mode, if the reference SOC is smaller than the current SOC and the difference delta between the reference SOC and the current SOC is larger than a preset difference, the current SOC is updated once every t/n time within a preset time t, and the updating rule is that delta/n is reduced every time. When the power battery is in a discharging mode, if the reference SOC is smaller than the current SOC and the difference delta between the reference SOC and the current SOC is larger than a preset difference, updating the current SOC once every t/n time within a preset time t, wherein the updating rule is that delta/n is reduced every time; when the power battery is in a discharging mode, if the reference SOC is larger than the current SOC and the difference delta between the reference SOC and the current SOC is larger than a preset difference, the current SOC is updated once every t/n time within a preset time t, and the updating rule is that delta/n is increased every time.
Optionally, if the reference SOC is greater than the first preset threshold and the difference between the reference SOC and the current SOC is less than or equal to the preset difference, the current SOC may be directly updated to the reference SOC, or the current SOC may be updated according to a preset curve within a certain time (the time may be less than the preset time) according to the reference SOC, where the preset curve may be a smooth monotonic curve or a stepped monotonic curve.
In one embodiment of the invention, if the reference SOC of the power battery is less than a second preset threshold value, and the operation mode is a discharging mode, the current SOC is updated according to the reference SOC, wherein the second preset threshold value is less than the first preset threshold value.
Specifically, if the reference SOC is in a low state (i.e. the reference SOC is smaller than the second preset threshold), and the power battery is currently in the discharging mode, the current SOC is directly updated according to the reference SOC, and if the reference SOC can be used as the current SOC of the power battery, the SOC jump is allowed to occur at this time, so as to avoid the over-discharging phenomenon of the power battery.
it should be noted that, when the reference SOC of the power battery is greater than or equal to the second preset threshold and smaller than the first preset threshold, the current SOC may be updated according to the updating method that the reference SOC is greater than the first preset threshold, the SOC may also be updated according to the updating method that the reference SOC is smaller than the second preset threshold, and the current SOC may also be updated according to a preset curve, for example, the current SOC changes to the reference SOC with a monotonically decreasing or monotonically increasing quadratic curve.
according to the parameter updating method after the power battery is kept stand, the current SOC of the power battery is updated in time according to the current working mode of the power battery and the reference SOC, the SOC obtained through updating can reflect the real situation of the power battery as much as possible, and the situation that the SOC is inaccurate and even jumps is avoided.
In one embodiment of the invention, after the power battery is placed still, the temperature of the power battery is also acquired; and when the temperature of the power battery is smaller than the preset temperature threshold, heating the power battery until the temperature of the power battery is larger than the preset temperature threshold, and updating the SOH of the power battery according to the updated SOC.
Specifically, a temperature sensor and a heater, such as a PTC heater, may be provided in the power battery, and the heater may be controlled to be activated to heat the power battery when the temperature of the power battery is less than a preset temperature threshold. And when the temperature of the power battery is greater than the preset temperature threshold, updating the SOH of the power battery according to the updated SOC so as to avoid the error phenomenon that the SOH is firstly reduced and then increased. The heating of the power battery and the updating of the current SOC may be performed simultaneously, or the power battery may be heated after the SOC is updated.
It can be understood that if the temperature of the power battery is greater than or equal to the preset temperature threshold, the SOH of the power battery is updated directly according to the updated SOC without heating control.
In another embodiment of the present invention, if the reference SOC is less than the second preset threshold and the operation mode is the charging mode, the power battery continues to be charged until the reference SOC of the power battery is greater than the first preset threshold, and the state of health SOH of the power battery is updated according to the updated SOC.
specifically, when the power battery is in a charging mode, if the reference SOC is in a low state, the power battery is continuously charged, and the reference SOC of the power battery is estimated in real time or at regular intervals according to a charging model. And when the reference SOC is larger than a first preset threshold value, updating the current SOC according to the difference value between the reference SOC and the current SOC, and updating the state of health (SOH) of the power battery according to the updated SOC.
Further, in an embodiment of the invention, after the power battery is placed still, the current temperature and the charge-discharge rate of the power battery are also obtained; and generating the maximum discharge allowable power and the maximum charge allowable power of the power battery according to the updated SOC and SOH of the power battery, the current temperature, the charge-discharge multiplying power and the preset reference curve cluster of the power battery.
Specifically, after updating the SOC and SOH, the reference curve cluster in the pre-stored BMS may be called in combination with the current temperature and the charge/discharge rate of the power battery, the maximum power that the power battery can discharge and the maximum power that is allowed to charge under the current operating condition are estimated, the BMS sends a power limit command to the motor controller to control the output power, and sends a charge limit command to an OBC (On-board Charger) to control the charge power.
in another embodiment of the invention, after updating the SOC and SOH, the state of energy SOE of the power battery is also updated according to the updated SOC and SOH.
in one embodiment of the invention, after the electric automobile is powered on, the current SOH and the ambient temperature of the power battery are acquired; and updating the remaining mileage according to the current SOH and the ambient temperature.
specifically, after the electric vehicle is powered on, the RM is predicted according to the current SOH, the ambient temperature, and the operation mode of the power battery for a recent period of time. It should be noted that the RM needs to be updated immediately after being powered on, so as to avoid the situation that the power battery is completely consumed when the electric vehicle runs halfway.
In conclusion, according to the parameter updating method after the power battery is kept stand, more accurate power battery parameters can be obtained, the true value of the power battery can be reflected, the conditions of SOC jump and RM jump are avoided while the parameters are updated, the error phenomenon of repeated jump is avoided, the phenomena of over-discharge and the like of the power battery are avoided, and therefore the power battery is well protected.
Further, the present invention proposes a non-transitory computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the parameter updating method after the power battery is left standing of the above-described embodiment.
According to the non-transitory computer-readable storage medium of the embodiment of the invention, when the program corresponding to the parameter updating method after the power battery is kept stand and stored on the non-transitory computer-readable storage medium is executed, more accurate power battery parameters can be obtained, the true value of the power battery can be reflected, the conditions of SOC jump and RM jump are avoided while updating the parameters, the error phenomenon of repeated jump is avoided, meanwhile, the phenomena of over-placing and the like of the power battery are avoided, and therefore, the power battery is well protected.
Fig. 2 is a parameter updating device after the power battery is placed still according to an embodiment of the invention. As shown in fig. 2, the parameter updating apparatus 100 after the power battery is stationary includes: the device comprises an acquisition module 1, a first acquisition module 2, a second acquisition module 3, a calculation module 4 and an update module 5.
The acquisition module 1 is used for acquiring the state information of the power battery once the power battery is awakened during the standing period of the power battery; the first acquisition module 2 is used for acquiring the awakening times of the power battery, corresponding state information when the power battery is awakened each time and the current state of charge (SOC) of the power battery after the power battery is stood; the second obtaining module 3 is used for obtaining the working mode of the power battery; the calculation module 4 is used for calculating the reference SOC of the power battery according to the awakened times and the corresponding state information when the power battery is awakened each time; the updating module 5 is used for updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery.
In one embodiment of the invention, the wake-up time interval of the power cell increases exponentially.
Specifically, the calculation module 4 calculates the reference SOC of the power battery by the following equation (1):
reference SOC (SOC) ═ SOCk＝m*(SOCk-1+ΔSOCSelf-discharge k)+n*SOCOCVk (1)
Wherein k is the accumulated awakening times of the power battery during the standing period, SOCk-1The SOC is the SOC when the power battery is awakened at the (k-1) th time in the standing stage, namely delta SOCSelf-discharge kThe SOC change caused by self-discharge of the power battery when the kth awakeningChemical quantity, SOCOCVkAnd m and n are weight coefficients, and m + n is 1.
When the working mode is the charging mode, the updating module 5 updates the current SOC of the power battery according to the charging model and the reference SOC of the power battery; when the working mode is the discharging mode, updating the current SOC of the power battery according to the discharging model and the reference SOC of the power battery
The updating module 5 is also used for updating the current SOC according to the reference SOC according to a preset proportion when the reference SOC of the power battery is larger than a first preset threshold value and the difference value between the reference SOC and the current SOC is larger than a preset difference value; and when the reference SOC of the power battery is smaller than a second preset threshold and the working mode is a discharging mode, updating the current SOC according to the reference SOC, wherein the second preset threshold is smaller than the first preset threshold.
In an embodiment of the present invention, as shown in fig. 3, the parameter updating apparatus 100 after the power battery is stationary further includes: a third acquisition module 6 and a heating module 7.
The third obtaining module 6 is used for obtaining the temperature of the power battery after the power battery is placed; the heating module 7 is used for heating the power battery when the temperature of the power battery is smaller than a preset temperature threshold value.
in this embodiment, the updating module 5 is further configured to update the state of health SOH of the power battery according to the updated SOC when the temperature of the power battery is greater than the preset temperature threshold.
In one embodiment of the present invention, as shown in fig. 4, the parameter updating apparatus 100 after the power battery is placed still further includes a control module 8.
The control module 8 is configured to continue to perform charging control on the power battery when the reference SOC is smaller than a second preset threshold and the working mode is the charging mode.
In this embodiment, the updating module 5 is further configured to update the state of health SOH of the power battery according to the updated SOC when the reference SOC of the power battery is greater than the first preset threshold.
Further, the updating module 5 updates the SOE of the power battery according to the updated SOC and SOH.
In an embodiment of the present invention, as shown in fig. 5, the parameter updating apparatus 100 after the power battery is placed still further includes a fourth obtaining module 9.
the fourth obtaining module 9 is configured to obtain the current SOH and the ambient temperature of the power battery after the electric vehicle is powered on.
In this embodiment, the update module 5 also updates the remaining range according to the current SOH and the ambient temperature.
in an embodiment of the present invention, as shown in fig. 6, the parameter updating apparatus 100 after the power battery is stationary further includes: a fifth acquiring module 10 and a generating module 11.
the fifth obtaining module 10 is configured to obtain a current temperature and a charge-discharge rate of the power battery. The generating module 11 is configured to generate the maximum allowable discharging power and the maximum allowable charging power of the power battery according to the updated SOC and SOH of the power battery, the current temperature of the power battery, the charging and discharging rate, and a preset reference curve cluster.
It should be noted that, for other specific embodiments of the parameter updating apparatus after the power battery is placed still according to the embodiment of the present invention, reference may be made to the specific embodiment of the parameter updating method after the power battery is placed still, and details are not described here for reducing redundancy.
According to the parameter updating device after the power battery is placed statically, accurate power battery parameters can be obtained, the true value of the power battery can be reflected, the conditions of SOC jump and RM jump are avoided while the parameters are updated, the error phenomenon of repeated jump is avoided, the phenomena of over-discharge and the like of the power battery are avoided, and therefore the power battery is well protected.
Fig. 7 is a block diagram of an electric vehicle according to an embodiment of the present invention. As shown in fig. 7, the electric vehicle 1000 includes the parameter updating apparatus 100 after the power battery of the above embodiment is stationary.
According to the electric vehicle provided by the embodiment of the invention, by adopting the parameter updating device after the power battery is kept stand, more accurate power battery parameters can be obtained, the true value of the power battery can be reflected, the conditions of SOC jump and RM jump are avoided while the parameters are updated, the error phenomenon of repeated jump is avoided, the phenomena of over-discharge and the like of the power battery are also avoided, and the power battery is well protected.
It should be noted that other configurations and functions of the electric vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (22)
1. a parameter updating method after a power battery is placed still is characterized by comprising the following steps:
During the standing period of the power battery, acquiring the state information of the power battery once when the power battery is awakened;
After the power battery is placed and stopped, acquiring the awakening times of the power battery, corresponding state information and current SOC (state of charge) when the power battery is awakened each time, and acquiring the working mode of the power battery;
calculating the reference SOC of the power battery according to the awakening times and the corresponding state information when the power battery is awakened each time;
and updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery.
2. the method for updating the parameters of the power battery after the power battery is placed, according to the awakened times and the corresponding state information of the power battery at each awakened time, as set forth in claim 1, comprises the following steps:
Calculating the reference SOC of the power battery by the following formula:
Reference SOC (SOC) ═ SOCk＝m*(SOCk-1+ΔSOCSelf-discharge k)+n*SOCOCVk，
Wherein k is the accumulated awakening times of the power battery during the standing period, SOCk-1Is the SOC, delta SOC, of the power battery when the power battery is awakened at the (k-1) th time in the standing stageSelf-discharge kIs the SOC variation quantity caused by self-discharge of the power battery when the power battery is awakened at the k time, the SOCOCVkAnd obtaining the SOC according to an SOC-OCV curve when the power battery is awakened the kth time, wherein m and n are weight coefficients, and m + n is 1.
3. The method for updating the parameters of the power battery after the standing is characterized in that the awakening time interval of the power battery is increased exponentially.
4. The parameter updating method for the power battery after the power battery is placed in the static state, which is characterized in that the updating of the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery comprises the following steps:
When the working mode is a charging mode, updating the current SOC of the power battery according to a charging model and the reference SOC of the power battery;
And when the working mode is a discharging mode, updating the current SOC of the power battery according to a discharging model and the reference SOC of the power battery.
5. The parameter updating method after the power battery is placed statically according to claim 1, wherein the updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery further comprises:
If the reference SOC of the power battery is larger than a first preset threshold value and the difference value between the reference SOC and the current SOC is larger than a preset difference value, updating the current SOC according to the reference SOC according to a preset proportion;
And if the reference SOC of the power battery is smaller than a second preset threshold value and the working mode is a discharging mode, updating the current SOC according to the reference SOC, wherein the second preset threshold value is smaller than the first preset threshold value.
6. the method for updating the parameters of the power battery after the power battery is placed still, which is characterized by further comprising the following steps:
After the power battery is placed and placed, acquiring the temperature of the power battery;
and when the temperature of the power battery is smaller than a preset temperature threshold, heating the power battery until the temperature of the power battery is larger than the preset temperature threshold, and updating the SOH (state of health) of the power battery according to the updated SOC.
7. The method for updating the parameters of the power battery after the standing still is characterized by further comprising the following steps:
And if the reference SOC is smaller than the second preset threshold value and the working mode is a charging mode, continuing charging the power battery until the reference SOC of the power battery is larger than the first preset threshold value, and updating the SOH of the power battery according to the updated SOC.
8. The method for updating the parameters of the power battery after the standing still as claimed in claim 6 or 7, further comprising:
And updating the energy state SOE of the power battery according to the updated SOC and SOH.
9. The method for updating the parameters of the power battery after the power battery is placed still, which is characterized by further comprising the following steps:
After the electric automobile is powered on, acquiring the current SOH and the ambient temperature of the power battery;
And updating the remaining mileage according to the current SOH and the environmental temperature.
10. the method for updating the parameters of the power battery after the standing still as claimed in claim 6 or 7, further comprising:
After the power battery is placed still, acquiring the current temperature and the charge and discharge multiplying power of the power battery;
And generating the maximum discharging allowable power and the maximum charging allowable power of the power battery according to the updated SOC and SOH of the power battery, the current temperature, the charging and discharging multiplying power and a preset reference curve cluster of the power battery.
11. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the parameter updating method after rest of a power battery according to any one of claims 1 to 10.
12. A parameter updating device after a power battery is placed still is characterized by comprising:
The acquisition module is used for acquiring the state information of the power battery once when the power battery is awakened once during the standing period of the power battery;
The first acquisition module is used for acquiring the awakening times of the power battery, corresponding state information when the power battery is awakened each time and the current SOC of the power battery after the power battery is placed;
The second acquisition module is used for acquiring the working mode of the power battery;
the calculation module is used for calculating the reference SOC of the power battery according to the awakened times and the corresponding state information when the power battery is awakened each time;
And the updating module is used for updating the current SOC of the power battery according to the working mode of the power battery and the reference SOC of the power battery.
13. the device for updating parameters of a power battery after standing as claimed in claim 12, wherein the calculation module is specifically configured to:
Calculating the reference SOC of the power battery by the following formula:
reference SOC (SOC) ═ SOCk＝m*(SOCk-1+ΔSOCself-discharge k)+n*SOCOCVk，
Wherein k is the accumulated awakening times of the power battery during the standing period, SOCk-1Is the SOC, delta SOC, of the power battery when the power battery is awakened at the (k-1) th time in the standing stageself-discharge kis the SOC variation quantity caused by self-discharge of the power battery when the power battery is awakened at the k time, the SOCOCVkAnd obtaining the SOC according to an SOC-OCV curve when the power battery is awakened the kth time, wherein m and n are weight coefficients, and m + n is 1.
14. The parameter updating apparatus after the power battery is placed in the static state, according to claim 12, wherein the awakening time interval of the power battery is increased exponentially.
15. The device for updating parameters of a power battery after standing as claimed in claim 12, wherein the updating module is specifically configured to:
When the working mode is a charging mode, updating the current SOC of the power battery according to a charging model and the reference SOC of the power battery;
and when the working mode is a discharging mode, updating the current SOC of the power battery according to a discharging model and the reference SOC of the power battery.
16. The device for updating parameters of a power battery after standing according to claim 12, wherein the updating module is further configured to:
when the reference SOC of the power battery is larger than a first preset threshold value and the difference value between the reference SOC and the current SOC is larger than a preset difference value, updating the current SOC according to the reference SOC according to a preset proportion;
And when the reference SOC of the power battery is smaller than a second preset threshold value and the working mode is a discharging mode, updating the current SOC according to the reference SOC, wherein the second preset threshold value is smaller than the first preset threshold value.
17. the device for updating parameters after the power battery is placed in a static way as claimed in claim 12, further comprising:
The third acquisition module is used for acquiring the temperature of the power battery after the power battery is placed;
The heating module is used for heating the power battery when the temperature of the power battery is smaller than a preset temperature threshold value;
the updating module is further used for updating the battery state of health (SOH) of the power battery according to the updated SOC when the temperature of the power battery is larger than the preset temperature threshold.
18. The device for updating parameters of a power battery after standing still as claimed in claim 16, further comprising:
The control module is used for continuing to perform charging control on the power battery when the reference SOC is smaller than the second preset threshold and the working mode is a charging mode;
The updating module is further used for updating the state of health (SOH) of the power battery according to the updated SOC when the reference SOC of the power battery is larger than the first preset threshold.
19. The parameter updating device for the power battery after the standing still as claimed in claim 17 or 18, wherein the updating module is further configured to:
And updating the energy state SOE of the power battery according to the updated SOC and SOH.
20. the device for updating parameters after the power battery is placed in a static way as claimed in claim 12, further comprising:
The fourth acquisition module is used for acquiring the current SOH and the ambient temperature of the power battery after the electric automobile is powered on;
the updating module is further used for updating the remaining mileage according to the current SOH and the ambient temperature.
21. The parameter updating device for the power battery after the standing still as claimed in claim 17 or 18, further comprising:
The fifth acquisition module is used for acquiring the current temperature and the charge-discharge multiplying power of the power battery after the power battery is placed;
And the generating module is used for generating the maximum discharging allowable power and the maximum charging allowable power of the power battery according to the updated SOC and SOH of the power battery, the current temperature, the charging and discharging multiplying power and a preset reference curve cluster of the power battery.
22. An electric vehicle characterized by comprising a parameter updating device after the power battery is placed in a stationary state according to any one of claims 12 to 21.
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| CN201810278615.9A CN110549900B (en) | 2018-03-30 | 2018-03-30 | Parameter updating method and device for electric automobile and power battery after standing |
| PCT/CN2019/079452 WO2019184847A1 (en) | 2018-03-30 | 2019-03-25 | Electric vehicle and method and device for updating parameter of power battery in static state |
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| CN201810278615.9A CN110549900B (en) | 2018-03-30 | 2018-03-30 | Parameter updating method and device for electric automobile and power battery after standing |
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| CN110549900B (en) | 2021-06-18 |
| WO2019184847A1 (en) | 2019-10-03 |
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