CN113809795A - Control method and control system for battery charging and discharging depth, automobile and storage medium - Google Patents

Control method and control system for battery charging and discharging depth, automobile and storage medium Download PDF

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Publication number
CN113809795A
CN113809795A CN202111002820.0A CN202111002820A CN113809795A CN 113809795 A CN113809795 A CN 113809795A CN 202111002820 A CN202111002820 A CN 202111002820A CN 113809795 A CN113809795 A CN 113809795A
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Prior art keywords
preset
battery
charge
parameter
depth
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Inventor
周宽
张新卫
郭文龙
陈小源
陈斌斌
彭翔
梁吉旺
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Sunwoda Electronic Co Ltd
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Sunwoda Electronic Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The application discloses a control method and a control system for battery charging and discharging depth, an automobile and a storage medium. The control method of the battery charging and discharging depth comprises the following steps: acquiring the service life of the battery, determining that the service life is less than a first preset threshold value, and updating the charge-discharge depth of the battery according to a preset first charge-discharge depth parameter; determining that the used life is greater than or equal to a first preset threshold; acquiring an operation parameter, acquiring a second charge-discharge depth parameter according to the operation parameter and a preset relation, and updating the charge-discharge depth according to the second charge-discharge depth parameter; determining that the used life is less than the target life; determining that the service life variation after the charging and discharging depth is updated is larger than or equal to a second preset threshold, and executing again: and acquiring operation parameters. The method and the device can quantify the relation between the charging and discharging depth and the service life of the battery, so that the service life reaches the target service life by controlling the charging and discharging depth.

Description

Control method and control system for battery charging and discharging depth, automobile and storage medium
Technical Field
The application relates to the technical field of batteries, in particular to a control method and a control system for battery charging and discharging depth, an automobile and a storage medium.
Background
In the related art, the service life of the battery is extended by three methods to control the service life of the battery to reach the target service life: firstly, an active or passive thermal management system is adopted to enable a battery to operate in a proper temperature range; secondly, the current used by the battery is reduced so as to avoid the situations of overheating, overpotential lithium deposition and the like; thirdly, the deep charging and deep discharging operations of the battery are avoided.
In practical applications, the first and second methods achieve the above effect by setting a use temperature threshold, a current threshold, and the like of the battery, and the third method achieves the above effect by adopting fitting of semi-empirical or pure numerical formula. However, the fitting formula does not consider the influence of the internal electrochemical mechanism of the battery on the service life of the battery, so that the relation between the DOD (depth of charge and discharge) and the service life of the battery is difficult to quantify. Therefore, the DOD of the battery cannot be accurately controlled by the third method so that the service life of the battery reaches the target service life.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a control method, a control system, an automobile and a storage medium for battery charging and discharging depth, which can quantify the relation between the battery charging and discharging depth and the service life, so that the service life reaches the target service life by controlling the charging and discharging depth of the battery.
The method for controlling the charging and discharging depth of the battery according to the embodiment of the first aspect of the application comprises the following steps: the method comprises the steps of obtaining the service life of a battery, determining that the service life is smaller than a first preset threshold value, and updating the charge-discharge depth of the battery according to a preset first charge-discharge depth parameter; determining that the used life is greater than or equal to the first preset threshold; acquiring an operation parameter; obtaining a second charge-discharge depth parameter according to the operation parameter and a preset relation, and updating the charge-discharge depth according to the second charge-discharge depth parameter; determining that the used life is less than a target life; determining that the change amount of the service life after the charging and discharging depth is updated is greater than or equal to the second preset threshold, and executing the following steps again: and acquiring operation parameters.
The method for controlling the charging and discharging depth of the battery according to the embodiment of the application has at least the following beneficial effects: when the service life is shorter than a first preset threshold value, controlling the battery to operate at a first charge-discharge depth parameter; when the service life is longer than or equal to a first preset threshold, calculating a second charge-discharge depth parameter according to the operation parameter and a preset relation, and controlling the battery to operate according to the second charge-discharge depth parameter when the variation of the service life is smaller than the second preset threshold; and controlling the battery to operate according to the new charge-discharge depth parameter calculated by the operation parameter and the preset relation when the variation of the service life of the battery is greater than or equal to a second preset parameter. The target service life is divided into a plurality of intervals, and corresponding charge-discharge depth parameters are calculated according to the interval where the service life is located, the operation parameters and the preset relation. Therefore, the influence of different charging and discharging depths on the service life of the battery can be quantified, and the service life of the battery can reach the target service life by controlling the charging and discharging depths of the battery.
According to some embodiments of the present application, the preset relationship comprises a first preset relationship, and the operating parameter comprises an accumulated discharge energy; before the obtaining of the used service life of the battery, the method for controlling the charging and discharging depth of the battery further comprises: acquiring first capacity loss of the battery in a storage state, and acquiring second capacity loss of the battery in a use state according to preset discharge energy; obtaining the first preset relation according to the first capacity loss and the second capacity loss; the obtaining of the second charge-discharge depth parameter according to the operation parameter and the preset relation comprises: obtaining a third charge-discharge depth parameter according to the accumulated discharge energy and the first preset relation; and acquiring a target weight value according to the operation parameter, and acquiring a second charge-discharge depth parameter according to the target weight value and the third charge-discharge depth parameter.
According to some embodiments of the present application, the preset relationship further comprises a second preset relationship, and the operating parameter further comprises at least one of a temperature and a charging frequency; the obtaining of the target weight value according to the operating parameter includes: within a preset time, acquiring at least one of the total duration of the temperature greater than a preset temperature threshold, the total times of the charging frequency greater than a first preset charging threshold and the occupation ratio of the charging frequency less than a second preset charging threshold; and performing reduction operation or increase operation on a preset weight value according to at least one of the total duration, the total times and the occupation ratio and the second preset relation to obtain the target weight value.
According to some embodiments of the application, the second preset relationship comprises at least one of: if the total duration is greater than a third preset threshold, reducing the preset weight value; if the total times are greater than a fourth preset threshold, reducing the preset weight value; and if the ratio is greater than a fifth preset threshold, increasing the preset weight value.
According to some embodiments of the present application, the preset relationship further comprises a second preset relationship, and the operation parameter further comprises at least one of an accumulated mileage and an average speed; the obtaining of the target weight value according to the operating parameter further includes: performing reduction operation or increase operation on a preset weight value according to at least one of the accumulated driving mileage and the average speed and a second preset relation to obtain a target weight value; the second predetermined relationship further comprises at least one of: if the ratio of the accumulated driving mileage to a sixth preset threshold value is a positive integer, reducing the preset weight value; and if the average speed is less than a seventh preset threshold and the ratio of the average speed greater than the seventh preset threshold is less than an eighth preset threshold, increasing the preset weight value.
According to some embodiments of the application, the used lifetime comprises at least one of a current distance travelled, a current length of time travelled.
According to a second aspect of the present application, an automobile includes: a controller for performing the method of controlling the depth of charge and discharge of the battery as described in any of the above embodiments.
A control system of battery charge and discharge depth according to an embodiment of a third aspect of the present application includes: the device comprises a first module, a second module and a third module, wherein the first module is used for obtaining the service life of a battery, determining that the service life is less than a first preset threshold value, and updating the charge-discharge depth of the battery according to a preset first charge-discharge depth parameter; a second module for determining that the used life is greater than or equal to the first preset threshold; a third module for obtaining operating parameters; obtaining a second charge-discharge depth parameter according to the operation parameter and a preset relation, and updating the charge-discharge depth according to the second charge-discharge depth parameter; a fourth module to determine that the used life is less than a target life; determining that the change amount of the service life after the charging and discharging depth is updated is greater than or equal to the second preset threshold, and executing the following steps again: and acquiring the operating parameters.
A control system of battery charge and discharge depth according to an embodiment of a fourth aspect of the present application includes: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor is caused to implement the method for controlling the battery charging and discharging depth as described in the above embodiments.
The computer-readable storage medium according to the fifth aspect of the present application stores therein processor-executable instructions, which when executed by a processor, are used to implement the control method of battery charge and discharge depth as described in the above embodiments.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The present application is further described with reference to the following figures and examples, in which:
FIG. 1 is a flowchart illustrating a method for controlling the charging/discharging depth of a battery according to an embodiment of the present invention;
FIG. 2 is another flowchart of a method for controlling a charging/discharging depth of a battery according to an embodiment of the present disclosure;
FIG. 3 is another flowchart of a method for controlling a charging/discharging depth of a battery according to an embodiment of the present disclosure;
FIG. 4 is a diagram illustrating a first predetermined relationship according to an embodiment of the present application;
FIG. 5 is another flowchart of a method for controlling a charging/discharging depth of a battery according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a system for controlling the charging/discharging depth of a battery according to an embodiment of the present disclosure.
Reference numerals:
a first module 100, a second module 200, a third module 300, a fourth module 400.
Detailed Description
Reference will now be made in detail to embodiments of the present application, 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 exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily 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.
In the following description, the service life of the battery indicates any one of a time period, a number of charge and discharge cycles, and the like required for the battery to gradually decay from a rated capacity at the time of shipment to a certain threshold. Therefore, the used life indicates any one of the used time length, the number of completed charge and discharge cycles, and the like of the battery in the current state; the target service life indicates any one of a desired service time period, a desired number of charge and discharge cycles, and the like.
When the battery is applied to a certain product, the used life of the battery also indicates that the current battery drives the normal operation capability of the product, and the like. For example, in the automotive field, the used life of a battery represents any one of the current mileage of an automobile, the current length of time the automobile has been driven, and the like. Correspondingly, the target service life represents the ability of the battery to be expected to drive the product to operate normally, and the like. For example, in the automotive field, the target service life of the battery represents any one of a desired automobile mileage, a desired automobile age, and the like.
Take the target service life as the expected driving mileage of the automobile as an example. In the related art, if the quality assurance expectation of the entire driving range of the battery is 100 kilometers (i.e. the target service life is 100 kilometers), and the power consumption of the entire battery is 15kWh, the battery manufacturer may provide the following two battery control methods according to the user requirements: firstly, controlling the SOC (State of Charge) of the battery to be within a range of 5-95% of the SOC, and then, controlling the charging and discharging depth of the battery to be within a higher charging and discharging depth range; secondly, the SOC of the battery is controlled to be between 10% and 90%, and the charge-discharge depth of the battery is in a lower charge-discharge depth range. Although the first method can increase the single full-charge endurance of the automobile, the target service life expectation of a user cannot be met; the second approach, while meeting the user's target life expectancy, can affect the single charge endurance of the vehicle.
Based on this, the embodiment of the application provides a control method, a control system, an automobile and a storage medium for battery charging and discharging depth, which can quantify the influence of different charging and discharging depths on the service life of a battery, so that the service life of the battery reaches the target service life by controlling the charging and discharging depth of the battery, and further, the target service life expectation of a user is met on the premise of not influencing the single charging endurance of the automobile.
Referring to fig. 1, an embodiment of the present application provides a method for controlling a charging/discharging depth of a battery. The method for controlling the charging and discharging depth of the battery comprises the following steps:
s110, obtaining the service life of the battery, determining that the service life is less than a first preset threshold value, and updating the charge-discharge depth of the battery according to a preset first charge-discharge depth parameter;
s120, determining that the service life is greater than or equal to a first preset threshold;
s130, acquiring operation parameters; obtaining a second charge-discharge depth parameter according to the operation parameter and a preset relation, and updating the charge-discharge depth according to the second charge-discharge depth parameter;
s140, determining that the used service life is less than the target service life; and determining that the change amount of the service life after the charging and discharging depth is updated is greater than or equal to a second preset threshold, and executing the step S120 again.
Specifically, the used life of the battery indicates any one of a used time period, a number of completed charge and discharge cycles, and the like of the battery in the current state. When the battery is applied to a certain product, the used life of the battery also represents the capability of the current battery to drive the product to normally operate, and the like. Before the service life is set to be less than a first preset threshold, the Battery is controlled to operate at an allowed maximum DOD (namely a first charge-discharge depth parameter), and tools such as a BMS (Battery Management System) and a cloud platform are used for recording operation parameters of the Battery and/or a product applied by the Battery in the operation process. And obtaining a corresponding second charge-discharge depth parameter according to the operation parameter and a preset relation, and controlling the charge-discharge depth of the battery in the next interval by using the second charge-discharge depth parameter.
Wherein the target service life is divided into a plurality of intervals according to a first numerical length between a first preset threshold value of the compartment and a zero value and/or according to a second numerical length between a second preset threshold value and the zero value. The preset relationship represents a relational expression of the charge-discharge depth and the operation parameter calculated in advance through a battery aging mechanism. And after the second charge-discharge depth parameter is obtained through calculation, judging whether the service life of the battery reaches the target service life, if not, controlling the battery to continue to operate by using the second charge-discharge depth parameter, and updating the service life. After the charging and discharging depth of the battery is changed into a second charging and discharging depth parameter, judging whether the variation of the service life is greater than or equal to a second preset threshold value, namely judging whether the service life is in another interval, and if the variation is not greater than the second preset threshold value, controlling the battery to continue to operate according to the second charging and discharging depth parameter; and if the variable quantity is determined to be larger than or equal to the second preset threshold value, obtaining a new charge-discharge depth parameter according to the operation parameter and the preset relation, and controlling the operation of the battery in the interval by using the new charge-discharge depth parameter. The above operations are repeated until the service life of the battery reaches the target service life, i.e., until the service life has traversed all intervals. It is understood that the first preset threshold and the second preset threshold may be equal or unequal, and the embodiment of the present application is not particularly limited.
For example, the control method of the battery charging and discharging depth is applied to the field of automobiles, and the service life of the battery represents the current driving mileage of the automobile. The first preset threshold and the second preset threshold are set to be ten thousand kilometers, namely, each ten thousand kilometers of the automobile is divided into one interval. Therefore, according to the control method for the battery charging and discharging depth provided by the embodiment of the application, the vehicle can perform the updating operation once when the vehicle runs for ten thousand kilometers of the battery charging and discharging depth. Specifically, when the automobile is driven for the initial ten thousand kilometers, the battery is controlled to operate at the maximum allowable DOD (i.e., the first charge-discharge depth parameter). And when the current traveled mileage of the automobile reaches ten thousand kilometers or is more than ten thousand kilometers, calculating according to the running parameters of the battery and/or the automobile and the preset relationship to obtain a second charge-discharge depth parameter. And controlling the battery to operate at a second charge-discharge depth parameter within the next ten thousand kilometers of the running of the automobile (namely, the current running mileage is between ten thousand kilometers and twenty thousand kilometers). When the current traveled mileage of the automobile reaches twenty thousand kilometers or more, the variation of the current traveled mileage is more than or equal to one thousand kilometers, so that a new charge-discharge depth parameter is calculated according to the running parameters of the battery and/or the automobile and the preset relationship, and the charge-discharge depth of the battery when the current traveled mileage of the automobile reaches twenty thousand kilometers to thirty thousand kilometers is controlled by using the new charge-discharge depth parameter. The operation is repeated to update the charging and discharging depth of the automobile running at each ten thousand kilometers until the current running mileage of the automobile reaches the target service life, so that the service life of the battery is controlled to reach the target service life on the premise of not influencing the single charging endurance.
According to the control method for the charge and discharge depth of the battery, when the service life is shorter than a first preset threshold value, the battery is controlled to operate according to a first charge and discharge depth parameter; when the service life is longer than or equal to a first preset threshold, calculating a second charge-discharge depth parameter according to the operation parameter and a preset relation, and controlling the battery to operate according to the second charge-discharge depth parameter when the variation of the service life is smaller than the second preset threshold; and controlling the battery to operate according to the new charge-discharge depth parameter calculated by the operation parameter and the preset relation when the variation of the service life of the battery is greater than or equal to a second preset parameter. The target service life is divided into a plurality of intervals, and corresponding charge-discharge depth parameters are calculated according to the interval where the service life is located, the operation parameters and the preset relation. Therefore, the influence of different charging and discharging depths on the service life of the battery can be quantified, and the service life of the battery can reach the target service life by controlling the charging and discharging depths of the battery.
Referring to fig. 2 and 3, in some embodiments, the predetermined relationship comprises a first predetermined relationship and the operating parameter comprises an accumulated discharge energy.
Before step S110, the method for controlling the charging and discharging depth of the battery according to the embodiment of the present application further includes the steps of:
s210, acquiring a first capacity loss of the battery in a storage state, and acquiring a second capacity loss of the battery in a use state according to preset discharge energy;
and S220, obtaining a first preset relation according to the first capacity loss and the second capacity loss.
The step S130 of obtaining the second charge-discharge depth parameter according to the operation parameter and the preset relationship includes the substeps of:
s310, obtaining a third charge-discharge depth parameter according to the accumulated discharge energy and the first preset relation;
s320, obtaining a target weight value according to the operation parameters, and obtaining a second charge-discharge depth parameter according to the target weight value and the third charge-discharge depth parameter.
Specifically, the causes of aging of the battery include calendar aging and cycle aging, that is, including aging of the battery in a static stateResulting in slow aging and aging resulting from charging and discharging of the battery. Wherein the calendar aging is due to thickening of the solid electrolyte interface film during storage of the battery; cyclic aging is caused by the continuous rupture and reconfiguration of the electrolyte interface film during the charging and discharging processes of the battery. Therefore, the first capacity loss Q shown in the following formula (1) can be obtained by the test1And a second capacity loss Q represented by the following formula (2)2。
Q1＝tgamma..
Figure BDA0003236160880000071
Figure BDA0003236160880000072
Wherein t represents the battery test duration, gamma, a and k are constants, and n represents the theoretical accumulated discharge energy (i.e., the preset discharge energy) when the battery reaches the target service life. Losing the first capacity by Q1And a second capacity loss Q2Performing superposition calculation (shown in formula (3)) to obtain the total capacity loss QlossThus according to the total capacity loss QlossAnd the rated capacity of the battery to obtain the charge and discharge depth DOD of the battery, and further obtain the relationship between the different charge and discharge depths DOD and the accumulated discharge energy (i.e. a first preset relationship, as shown in FIG. 4). Therefore, the accumulated discharge energy obtained according to the above steps is substituted into the first preset relationship as shown in fig. 4, and a corresponding third charge-discharge depth parameter can be obtained. And obtaining a target weight value according to other operation parameters and a preset fuzzy rule, and carrying out operations such as weighted summation and the like on the third charge-discharge depth parameter according to the target weight value to obtain a second charge-discharge depth parameter. And controlling the charging and discharging depth of the battery in the corresponding interval according to the second charging and discharging depth parameter, and further realizing the quantification of the relation between the charging and discharging depth of the battery and the service life of the battery. It can be understood that the total capacity loss Q shown in the formula (3)lossThe calculation of (c) is merely exemplary, and the total capacity loss QlossMeter (2)The calculation method can also be adaptively adjusted according to actual needs.
Referring to fig. 5, in some embodiments, the predetermined relationship further comprises a second predetermined relationship, and the operating parameter further comprises at least one of a temperature and a charging frequency.
The step S320 of "obtaining a target weight value according to an operation parameter" includes the substeps of:
s510, in a preset time, acquiring at least one of the total duration of which the temperature is greater than a preset temperature threshold, the total times of which the charging frequency is greater than a first preset charging threshold and the occupation ratio of which the charging frequency is less than a second preset charging threshold;
s520, performing reduction operation or increase operation on the preset weight value according to at least one of the total duration, the total times and the occupation ratio and the second preset relation to obtain the target weight value.
Specifically, the preset weight value is dynamically adjusted by using a fuzzy rule (i.e., a second preset relationship) to obtain a target weight value. Wherein the fuzzy rule comprises at least one of:
if the total duration is greater than a third preset threshold, reducing the preset weight value;
if the total times are greater than a fourth preset threshold, reducing the preset weight value;
and if the ratio is greater than a fifth preset threshold, increasing the preset weight value.
Take the example of the preset time being "year", the preset temperature threshold being 35 ℃, the third preset threshold being two months, the fourth preset threshold being 540 times, and the fifth preset threshold being 50%. When the total time of the annual running temperature of the battery exceeds 35 ℃ is more than two months, reducing the preset weight value; when the total number of times of the year charging frequency of the battery is quick charging (namely the charging frequency is greater than a first preset charging threshold) is greater than 540 times, reducing a preset weight value; and when the annual battery charging frequency is that the ratio of slow charging (namely the charging frequency is less than a second preset charging threshold value) to the total charging times is more than 50%, increasing the preset weight value. It can be understood that specific values of the preset temperature threshold, the first preset charging threshold, the second preset charging threshold, the third preset threshold, the fourth preset threshold, and the fifth preset threshold may also be adaptively adjusted according to actual conditions, and the embodiment of the present application is not particularly limited.
Wherein, the following formula (4) is taken as an example for the second charge-discharge depth parameter DOD2The following explains the calculation of (a). In the formula (4), DOD3And b represents a third charge-discharge depth parameter, and b represents a preset weight value. Therefore, the decreasing operation means decreasing the value of the preset weight value, and the increasing operation means increasing the value of the preset weight value. For example, setting a preset weight value to 1, and reducing the value of the preset weight value by 0.1 every time a reduction operation is performed; and increasing the value of the preset weight value by 0.1 every time of increasing operation. It can be understood that the specific decreasing value and the specific increasing value of the preset weight value may be adaptively set according to actual situations, and the decreasing value and the increasing value may be equal or unequal, the decreasing value of each decreasing operation may be equal or unequal, and the increasing value of each increasing operation may be equal or unequal. It is understood that the second depth of charge and discharge parameter DOD shown in equation (4)2The second charge-discharge depth parameter DOD is only exemplary2The calculation of (2) can also be adaptively adjusted according to actual needs.
DOD2＝b·DOD3..
In some embodiments, when the control method of the battery charging and discharging depth is applied to the automobile field, the operation parameters described by the control method further include at least one of accumulated mileage and average speed.
Correspondingly, the step S320 of "obtaining the target weight value according to the operating parameter" further includes the sub-steps of: and performing reduction operation or increase operation on the preset weight value according to at least one of the accumulated driving mileage and the average speed and the second preset relation to obtain the target weight value.
Specifically, the preset weight value is dynamically adjusted by using a fuzzy rule (i.e., a second preset relationship) to obtain a target weight value. Wherein the fuzzy rule further comprises at least one of the following:
if the ratio of the accumulated driving mileage to the sixth preset threshold value is a positive integer, reducing the preset weight value;
and if the average speed is less than a seventh preset threshold and the ratio of the average speed greater than the seventh preset threshold is less than an eighth preset threshold, increasing the preset weight value.
Take the sixth preset threshold as ten thousand kilometers, the seventh preset threshold as 60, and the eighth preset threshold as 10% as an example. When the accumulated driving mileage of the automobile is in a multiple relation with ten thousand kilometers, namely when the accumulated driving mileage is increased by ten thousand kilometers, reducing the preset weight value; and when the annual average speed of the automobile is less than 60km/h and the percentage of the automobile less than 60km/h is less than 10%, increasing the preset weight value. It can be understood that specific values of the sixth preset threshold, the seventh preset threshold, and the eighth preset threshold may also be adaptively adjusted according to actual situations, and the embodiment of the present application is not particularly limited. The specific meanings of the lowering operation and the increasing operation are the same as those described in the above embodiments, and the description of the embodiments of the present application will not be repeated.
In some embodiments, when the control method of the battery charge and discharge depth of the above embodiments is applied to an automobile, the used life described in the above embodiments includes at least one of a current traveled distance and a current traveled time.
Specifically, the used life is taken as the current traveled distance as an example. And when the current traveled mileage of the automobile is less than ten thousand kilometers, controlling the battery to operate according to the first charge-discharge depth parameter. And when the current driving mileage of the automobile is more than or equal to ten thousand kilometers, substituting the accumulated discharge energy recorded by tools such as a BMS (battery management system), a cloud platform and the like into a first preset relation to obtain a third charge-discharge depth parameter. And obtaining a target weight value according to other operation parameters (including temperature, charging frequency, accumulated driving mileage and average speed) and a second preset relation, thus obtaining a second charging and discharging depth parameter according to the target weight value, the first charging and discharging depth parameter and the third charging and discharging depth parameter, and controlling the battery to operate at the second charging and discharging depth parameter when the current driving mileage of the automobile is within the interval of ten thousand kilometers to twenty thousand kilometers. And repeating the operation, and when the current traveled mileage of the automobile increases by ten thousand kilometers (namely, the second preset threshold value is set to be ten thousand kilometers), obtaining a new charge and discharge depth parameter according to the operation parameter, the first preset relation and the second preset relation, so as to control the battery to operate according to the new charge and discharge depth parameter until the current traveled mileage of the automobile reaches the target service life.
The embodiment of the application also provides an automobile. The automobile comprises a controller, and the controller is used for executing the control method of the charging and discharging depth of the battery in any embodiment. It is understood that the vehicle may be a pure electric vehicle, a hybrid electric vehicle, etc., and the embodiment of the present application is not particularly limited thereto.
Referring to fig. 6, an embodiment of the present application further provides a system for controlling a charging/discharging depth of a battery, including:
a first module 100, configured to obtain a used life of the battery, determine that the used life is less than a first preset threshold, and update a charge/discharge depth of the battery according to a preset first charge/discharge depth parameter
A second module 200 for determining that the used life is greater than or equal to a first preset threshold;
a third module 300, configured to obtain an operation parameter, obtain a second charge-discharge depth parameter according to the operation parameter and a preset relationship, and update the charge-discharge depth according to the second charge-discharge depth parameter;
a fourth module 400 for determining that the used life is less than the target life; determining that the service life variation is larger than or equal to a second preset threshold after the charging and discharging depth is updated, and executing the following steps again: and acquiring operation parameters.
It can be seen that, the contents in the above embodiments of the method for controlling the charging and discharging depth of a battery are all applicable to the embodiments of the system for controlling the charging and discharging depth of a battery, and the functions specifically implemented by the embodiments of the system for controlling the charging and discharging depth of a battery are the same as those of the embodiments of the method for controlling the charging and discharging depth of a battery, and the beneficial effects achieved by the embodiments of the method for controlling the charging and discharging depth of a battery are also the same as those achieved by the embodiments of the method for controlling the charging and discharging depth of a battery.
The embodiment of the present application further provides another control system for battery charging and discharging depth, where the control system for battery charging and discharging depth includes: the system includes at least one processor, and a memory communicatively coupled to the at least one processor. The memory stores instructions, and the instructions are executed by the at least one processor, so that the at least one processor can implement the method for controlling the charging and discharging depth of the battery as described in any one of the above embodiments when executing the instructions.
An embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for: the method for controlling the charging and discharging depth of the battery described in any of the above embodiments is performed.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims (10)

1. A method for controlling the depth of charge and discharge of a battery, comprising:
the method comprises the steps of obtaining the service life of a battery, determining that the service life is smaller than a first preset threshold value, and updating the charge-discharge depth of the battery according to a preset first charge-discharge depth parameter;
determining that the used life is greater than or equal to the first preset threshold;
acquiring an operation parameter; obtaining a second charge-discharge depth parameter according to the operation parameter and a preset relation, and updating the charge-discharge depth according to the second charge-discharge depth parameter;
determining that the used life is less than a target life; determining that the change amount of the service life after the charging and discharging depth is updated is greater than or equal to the second preset threshold, and executing the following steps again: and acquiring operation parameters.
2. The method according to claim 1, wherein the predetermined relationship comprises a first predetermined relationship, and the operating parameter comprises an accumulated discharge energy;
before the obtaining of the used service life of the battery, the method for controlling the charging and discharging depth of the battery further comprises:
acquiring first capacity loss of the battery in a storage state, and acquiring second capacity loss of the battery in a use state according to preset discharge energy;
obtaining the first preset relation according to the first capacity loss and the second capacity loss;
the obtaining of the second charge-discharge depth parameter according to the operation parameter and the preset relation comprises:
obtaining a third charge-discharge depth parameter according to the accumulated discharge energy and the first preset relation;
and acquiring a target weight value according to the operation parameter, and acquiring a second charge-discharge depth parameter according to the target weight value and the third charge-discharge depth parameter.
3. The method according to claim 2, wherein the predetermined relationship further comprises a second predetermined relationship, and the operating parameter further comprises at least one of temperature and charging frequency;
the obtaining of the target weight value according to the operating parameter includes:
within a preset time, acquiring at least one of the total duration of the temperature greater than a preset temperature threshold, the total times of the charging frequency greater than a first preset charging threshold and the occupation ratio of the charging frequency less than a second preset charging threshold;
and performing reduction operation or increase operation on a preset weight value according to at least one of the total duration, the total times and the occupation ratio and the second preset relation to obtain the target weight value.
4. The method of claim 3, wherein the second predetermined relationship comprises at least one of:
if the total duration is greater than a third preset threshold, reducing the preset weight value;
if the total times are greater than a fourth preset threshold, reducing the preset weight value;
and if the ratio is greater than a fifth preset threshold, increasing the preset weight value.
5. The method for controlling the charge and discharge depth of the battery according to any one of claims 2 to 4, applied to an automobile, wherein the preset relationship further comprises a second preset relationship, and the operation parameter further comprises at least one of accumulated mileage and average speed;
the obtaining of the target weight value according to the operating parameter further includes:
performing reduction operation or increase operation on a preset weight value according to at least one of the accumulated driving mileage and the average speed and a second preset relation to obtain a target weight value;
the second predetermined relationship further comprises at least one of:
if the ratio of the accumulated driving mileage to a sixth preset threshold value is a positive integer, reducing the preset weight value;
and if the average speed is less than a seventh preset threshold and the ratio of the average speed greater than the seventh preset threshold is less than an eighth preset threshold, increasing the preset weight value.
6. The method of claim 5, wherein the used life includes at least one of a current mileage traveled and a current length of time traveled.
7. An automobile, characterized by comprising:
a controller for performing the method of controlling the charge and discharge depth of the battery according to any one of claims 1 to 6.
8. A system for controlling the depth of charge and discharge of a battery, comprising:
the device comprises a first module, a second module and a third module, wherein the first module is used for obtaining the service life of a battery, determining that the service life is less than a first preset threshold value, and updating the charge-discharge depth of the battery according to a preset first charge-discharge depth parameter;
a second module for determining that the used life is greater than or equal to the first preset threshold;
a third module for obtaining operating parameters; obtaining a second charge-discharge depth parameter according to the operation parameter and a preset relation, and updating the charge-discharge depth according to the second charge-discharge depth parameter;
a fourth module to determine that the used life is less than a target life; determining that the change amount of the service life after the charging and discharging depth is updated is greater than or equal to the second preset threshold, and executing the following steps again: and acquiring the operating parameters.
9. A system for controlling the depth of charge and discharge of a battery, comprising:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is caused to implement the method of controlling battery charge and discharge depth according to any one of claims 1 to 6.
10. Computer readable storage medium having stored therein processor executable instructions, characterized in that said processor executable instructions, when executed by a processor, are adapted to implement a method of controlling battery charge and discharge depth according to any of claims 1 to 6.
CN202111002820.0A 2021-08-30 2021-08-30 Control method and control system for battery charging and discharging depth, automobile and storage medium Pending CN113809795A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117647743A (en) * 2024-01-30 2024-03-05 宁德时代新能源科技股份有限公司 Battery capacity determining method, device, equipment and storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117647743A (en) * 2024-01-30 2024-03-05 宁德时代新能源科技股份有限公司 Battery capacity determining method, device, equipment and storage medium

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