CN116488312B - Battery power management method, system, computer and readable storage medium - Google Patents

Battery power management method, system, computer and readable storage medium Download PDF

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Publication number
CN116488312B
CN116488312B CN202310748481.3A CN202310748481A CN116488312B CN 116488312 B CN116488312 B CN 116488312B CN 202310748481 A CN202310748481 A CN 202310748481A CN 116488312 B CN116488312 B CN 116488312B
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Prior art keywords
battery
power
electric quantity
charge
target
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CN116488312A (en
Inventor
龚循飞
邓建明
于勤
罗锋
张俊
熊慧慧
张萍
樊华春
廖程亮
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Jiangxi Isuzu Motors Co Ltd
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Jiangxi Isuzu Motors Co Ltd
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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • 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]
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • 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 provides a battery power management method, a system, a computer and a readable storage medium, wherein the method comprises the following steps: detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in the vehicle-mounted battery system in real time, and judging whether the difference between the first residual capacity and the second residual capacity is larger than a preset threshold value or not; if so, acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery, and calculating a charge-discharge strategy matched with the large battery according to the first working parameter and the second working parameter; and transmitting the charge-discharge strategy to the BMS so that the BMS can adjust the charge-discharge switch, the equalization switch and the pre-charge switch in the large battery according to the charge-discharge strategy, and convert the electric energy of the large battery into the electric energy of the small battery through the DCDC converter so as to supplement the electric quantity of the small battery. Through the mode, the phenomenon of power shortage of the small battery can be avoided, and the problem that the small battery cannot be started can be avoided.

Description

Battery power management method, system, computer and readable storage medium
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a battery power management method, a system, a computer and a readable storage medium.
Background
With the progress of technology and the rapid development of productivity, automobiles have been popularized in people's daily lives, wherein new energy automobiles have also been rapidly developed, and have been gradually approved by people, thereby facilitating people's lives.
The vehicle-mounted battery system in the existing new energy automobile consists of a large battery and a small battery, and particularly the large battery is used for providing a power source for a driving motor, and the small battery is used for starting vehicle electronic equipment so as to ensure the normal operation of the new energy automobile.
However, when the parking time of the existing new energy electric vehicle is long or other abnormal conditions occur, the small battery in the existing vehicle-mounted battery system may occur a phenomenon that the vehicle cannot be started effectively due to insufficient electric quantity, that is, a problem of power shortage occurs easily, so that the use experience of a user is reduced.
Disclosure of Invention
Based on this, the present invention aims to provide a battery power management method, a system, a computer and a readable storage medium, so as to solve the problem that the use experience of a user is reduced due to the fact that a small battery in the existing vehicle-mounted battery system may not effectively start a vehicle due to insufficient power.
An embodiment of the present invention provides a method for managing battery power, where the method includes:
detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in an on-vehicle battery system in real time, and judging whether a difference value between the first residual capacity and the second residual capacity is larger than a preset threshold value or not;
if the difference value between the first residual electric quantity and the second residual electric quantity is larger than the preset threshold value, acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery, and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter;
and transmitting the charge-discharge strategy to the BMS, so that the BMS adjusts a charge-discharge switch, an equalization switch and a pre-charge switch in the large battery according to the charge-discharge strategy, and converts the electric energy of the large battery into the electric energy of the small battery through a DCDC converter so as to supplement the electric quantity of the small battery.
The beneficial effects of the invention are as follows: detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in an on-vehicle battery system in real time, and judging whether the difference between the first residual capacity and the second residual capacity is larger than a preset threshold value or not; further, if the difference between the first residual electric quantity and the second residual electric quantity is larger than the preset threshold value, acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery, and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter; and finally, only transmitting the charge-discharge strategy to the BMS, so that the BMS adjusts the charge-discharge switch, the balance switch and the precharge switch in the large battery according to the charge-discharge strategy, and converts the electric energy of the large battery into the electric energy of the small battery through the DCDC converter so as to supplement the electric quantity of the small battery. According to the method, the corresponding charging and discharging strategy can be calculated in real time according to the electric quantity difference between the large battery and the small battery, and is implemented through the DCDC converter, so that electric energy in the large battery is supplemented to the small battery, the phenomenon of power shortage of the small battery can be effectively avoided, the problem that a vehicle cannot be started is avoided, and the use experience of a user is correspondingly improved.
Preferably, the step of calculating the charge-discharge strategy adapted to the large battery according to the first operating parameter and the second operating parameter includes:
extracting a first SOC value corresponding to the first residual electric quantity and a second SOC value corresponding to the second residual electric quantity, and calculating a target difference value between the first SOC value and the second SOC value;
determining a target threshold corresponding to the target difference value, wherein the target threshold is larger than the preset threshold, and the target threshold corresponds to an electric quantity compensation level;
and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter based on the electric quantity compensation grade.
Preferably, the step of calculating the charge-discharge strategy adapted to the large battery according to the first operating parameter and the second operating parameter based on the electric quantity compensation level includes:
extracting an electric quantity compensation coefficient contained in the electric quantity compensation grade, and determining a voltage protection point and a current protection point which are matched with the large battery according to the electric quantity compensation coefficient;
calculating battery protection power corresponding to the large battery according to the voltage protection point and the current protection point, and extracting target discharge power contained in the first working parameter and target charging power contained in the second working parameter;
And calculating a charging and discharging strategy matched with the large battery according to the battery protection power, the target discharging power and the target charging power.
Preferably, the step of calculating a charge-discharge strategy adapted to the large battery according to the battery protection power, the target discharge power and the target charge power includes:
calculating a target power difference between the target discharge power and the target charge power, and calculating a power ratio between the battery protection power and the target power difference;
and multiplying the power ratio by the electric quantity compensation coefficient to obtain a corresponding actual electric quantity compensation factor, and multiplying the target discharge power by the actual electric quantity compensation factor to obtain a corresponding actual electric quantity compensation power.
Preferably, the step of causing the BMS to adjust the charge-discharge switch, the equalization switch, and the precharge switch inside the large battery according to the charge-discharge strategy includes:
and acquiring power values corresponding to the charge-discharge switch, the balance switch and the pre-charge switch respectively, and adjusting the power values by opening or closing the charge-discharge switch, the balance switch and the pre-charge switch so as to enable the adjusted power values to be matched with the actual electric quantity supplement power.
Preferably, the step of converting the electric energy of the large battery into the electric energy of the small battery through the DCDC converter to supplement the electric energy of the small battery includes:
acquiring conversion data generated in real time by the DCDC converter, and calculating a heat value and a loss value generated in the charging process of the small battery in real time according to the conversion data;
and judging whether a heat dissipation system is started or not according to the heat value and the loss value based on a preset rule, wherein the heat dissipation system is used for dissipating heat of the large battery and the small battery.
Preferably, the method further comprises:
detecting running conditions of the vehicle in real time, wherein the running conditions comprise a high-speed condition, a low-speed condition and a parking condition;
when the vehicle is detected to be in a low-speed working condition or the parking working condition, the actual electric quantity supplementing power is reduced in a self-adaptive mode;
and when the vehicle is detected to be in a high-speed working condition, adaptively increasing the actual electric quantity supplementing power.
A second aspect of an embodiment of the present invention provides a battery power management system, including:
the judging module is used for detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in the vehicle-mounted battery system in real time and judging whether the difference value between the first residual capacity and the second residual capacity is larger than a preset threshold value or not;
The calculation module is used for acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery if the difference value between the first residual electric quantity and the second residual electric quantity is larger than the preset threshold value, and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter;
and the adjusting module is used for transmitting the charging and discharging strategy to the BMS, so that the BMS adjusts the charging and discharging switch, the equalizing switch and the pre-charging switch in the large battery according to the charging and discharging strategy, and converts the electric energy of the large battery into the electric energy of the small battery through the DCDC converter so as to supplement the electric quantity of the small battery.
In the above battery power management system, the computing module is specifically configured to:
extracting a first SOC value corresponding to the first residual electric quantity and a second SOC value corresponding to the second residual electric quantity, and calculating a target difference value between the first SOC value and the second SOC value;
determining a target threshold corresponding to the target difference value, wherein the target threshold is larger than the preset threshold, and the target threshold corresponds to an electric quantity compensation level;
And calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter based on the electric quantity compensation grade.
In the above battery power management system, the computing module is further specifically configured to:
extracting an electric quantity compensation coefficient contained in the electric quantity compensation grade, and determining a voltage protection point and a current protection point which are matched with the large battery according to the electric quantity compensation coefficient;
calculating battery protection power corresponding to the large battery according to the voltage protection point and the current protection point, and extracting target discharge power contained in the first working parameter and target charging power contained in the second working parameter;
and calculating a charging and discharging strategy matched with the large battery according to the battery protection power, the target discharging power and the target charging power.
In the above battery power management system, the computing module is further specifically configured to:
calculating a target power difference between the target discharge power and the target charge power, and calculating a power ratio between the battery protection power and the target power difference;
And multiplying the power ratio by the electric quantity compensation coefficient to obtain a corresponding actual electric quantity compensation factor, and multiplying the target discharge power by the actual electric quantity compensation factor to obtain a corresponding actual electric quantity compensation power.
In the above battery power management system, the adjusting module is specifically configured to:
and acquiring power values corresponding to the charge-discharge switch, the balance switch and the pre-charge switch respectively, and adjusting the power values by opening or closing the charge-discharge switch, the balance switch and the pre-charge switch so as to enable the adjusted power values to be matched with the actual electric quantity supplement power.
In the above battery power management system, the adjusting module is further specifically configured to:
acquiring conversion data generated in real time by the DCDC converter, and calculating a heat value and a loss value generated in the charging process of the small battery in real time according to the conversion data;
and judging whether a heat dissipation system is started or not according to the heat value and the loss value based on a preset rule, wherein the heat dissipation system is used for dissipating heat of the large battery and the small battery.
Among them, in the above-mentioned battery power management system, battery power management system still includes detection module, detection module specifically is used for:
detecting running conditions of the vehicle in real time, wherein the running conditions comprise a high-speed condition, a low-speed condition and a parking condition;
when the vehicle is detected to be in a low-speed working condition or the parking working condition, the actual electric quantity supplementing power is reduced in a self-adaptive mode;
and when the vehicle is detected to be in a high-speed working condition, adaptively increasing the actual electric quantity supplementing power.
A third aspect of the embodiments of the present invention proposes a computer comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the battery power management method as described above when executing the computer program.
A fourth aspect of the embodiments of the present invention proposes a readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements a battery level management method as described above.
Additional aspects and advantages of the invention 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 invention.
Drawings
Fig. 1 is a flowchart of a battery power management method according to a first embodiment of the present invention;
fig. 2 is a block diagram of a battery power management system according to a third embodiment of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a battery power management method according to a first embodiment of the present invention is shown, which can effectively avoid the phenomenon of power shortage of a small battery, so that the problem that a vehicle cannot be started is avoided, and the use experience of a user is correspondingly improved.
Specifically, the battery power management method provided in this embodiment specifically includes the following steps:
step S10, detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in an on-vehicle battery system in real time, and judging whether a difference value between the first residual capacity and the second residual capacity is larger than a preset threshold value;
in particular, in this embodiment, it should be first described that the battery power management method provided in this embodiment is specifically applied to various new energy electric vehicles of different models, and is used to perform real-time power compensation on a small battery in the new energy electric vehicle, so as to prevent the phenomenon of power shortage of the small battery. Specifically, the battery power management method provided in this embodiment compensates the power of the small battery in real time during the running process of the automobile, and in addition, preferably, the small battery provided in this embodiment is a storage battery in the new energy electric automobile, and correspondingly, the large battery provided in this embodiment is a driving battery in the new energy electric automobile.
Based on this, in this step, it should be noted that, for convenience of implementation, in this embodiment, the vehicle controller in the vehicle detects, in real time, the first remaining power corresponding to the large battery and the second remaining power in the small battery in the vehicle-mounted battery system in the vehicle, and based on this, determines, in real time, whether the difference between the current first remaining power and the second remaining power is greater than the preset threshold.
Step S20, if it is determined that the difference between the first remaining power and the second remaining power is greater than the preset threshold, acquiring a first working parameter generated at the current time of the large battery and a second working parameter generated at the current time of the small battery, and calculating a charge-discharge strategy adapted to the large battery according to the first working parameter and the second working parameter;
further, in this step, it should be noted that, if the difference between the current first remaining power and the second remaining power is determined in real time to be greater than the preset threshold in this embodiment, a first working parameter generated by the current large battery at the current moment and a second working parameter generated by the current small battery at the current moment need to be further acquired.
Specifically, the first working parameter and the second working parameter provided in this embodiment may include parameters such as working time, working voltage, and working current.
And step S30, transmitting the charge-discharge strategy to the BMS, so that the BMS adjusts a charge-discharge switch, an equalization switch and a pre-charge switch in the large battery according to the charge-discharge strategy, and converts the electric energy of the large battery into the electric energy of the small battery through a DCDC converter so as to supplement the electric energy of the small battery.
Finally, in this step, it should be noted that, after the required charge and discharge policy is calculated through the above steps, this embodiment further transmits the current charge and discharge policy to the BMS in the current vehicle, that is, the battery management system, and at the same time, the charge and discharge switch, the equalization switch, and the pre-charge switch in the current large battery can be adjusted in real time through the BMS.
Further, finally, the electric energy in the large battery can be converted into the small battery only through the DCDC converter in the current vehicle, so that the electric quantity in the small battery can be correspondingly supplemented. The big battery and the small battery are respectively and electrically connected with the DCDC converter, and the BMS can adaptively adjust the DCDC converter.
When the device is used, a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in the vehicle-mounted battery system are detected in real time, and whether the difference value between the first residual capacity and the second residual capacity is larger than a preset threshold value is judged; further, if the difference between the first residual electric quantity and the second residual electric quantity is larger than the preset threshold value, acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery, and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter; and finally, only transmitting the charge-discharge strategy to the BMS, so that the BMS adjusts the charge-discharge switch, the balance switch and the precharge switch in the large battery according to the charge-discharge strategy, and converts the electric energy of the large battery into the electric energy of the small battery through the DCDC converter so as to supplement the electric quantity of the small battery. According to the method, the corresponding charging and discharging strategy can be calculated in real time according to the electric quantity difference between the large battery and the small battery, and is implemented through the DCDC converter, so that electric energy in the large battery is supplemented to the small battery, the phenomenon of power shortage of the small battery can be effectively avoided, the problem that a vehicle cannot be started is avoided, and the use experience of a user is correspondingly improved.
It should be noted that the foregoing implementation procedure is only for illustrating the feasibility of the present application, but this does not represent that the battery power management method of the present application is only one implementation procedure, and may be incorporated into the feasible implementation of the battery power management method of the present application, as long as it can be implemented.
In summary, the battery power management method provided by the embodiment of the application can effectively avoid the phenomenon of power shortage of the small battery, so that the problem that the vehicle cannot be started is avoided, and the use experience of a user is correspondingly improved.
The second embodiment of the present application also provides a battery power management method, which is different from the battery power management method provided in the first embodiment in that:
specifically, in this embodiment, it should be noted that the step of calculating the charge-discharge policy adapted to the large battery according to the first working parameter and the second working parameter includes:
extracting a first SOC value corresponding to the first residual electric quantity and a second SOC value corresponding to the second residual electric quantity, and calculating a target difference value between the first SOC value and the second SOC value;
Determining a target threshold corresponding to the target difference value, wherein the target threshold is larger than the preset threshold, and the target threshold corresponds to an electric quantity compensation level;
and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter based on the electric quantity compensation grade.
Specifically, in this embodiment, it should be noted that, in order to accurately obtain the remaining capacities of the large battery and the small battery, the present embodiment further extracts a first SOC value corresponding to the first remaining capacity and a second SOC value corresponding to the second remaining capacity, and at the same time, calculates a target difference between the current first SOC value and the current second SOC value.
Further, since the target difference is a specific value, it is further possible to determine the threshold value that the current target difference falls into, that is, determine the required target threshold value, specifically, since it has been determined that the current target difference is greater than the preset threshold value, the target threshold value corresponding to the target difference is also greater than the preset threshold value, and each target threshold value provided in this embodiment corresponds to an electric quantity compensation level.
Based on the electric quantity compensation level, a charging and discharging strategy matched with the large battery can be calculated according to the first working parameter and the second working parameter.
Specifically, in this embodiment, it should be further noted that, based on the electric quantity compensation level, the step of calculating the charge-discharge policy adapted to the large battery according to the first operating parameter and the second operating parameter includes:
extracting an electric quantity compensation coefficient contained in the electric quantity compensation grade, and determining a voltage protection point and a current protection point which are matched with the large battery according to the electric quantity compensation coefficient;
calculating battery protection power corresponding to the large battery according to the voltage protection point and the current protection point, and extracting target discharge power contained in the first working parameter and target charging power contained in the second working parameter;
and calculating a charging and discharging strategy matched with the large battery according to the battery protection power, the target discharging power and the target charging power.
In particular, in this embodiment, it should be further noted that, in this embodiment, different electric quantity compensation coefficients are made according to different electric quantity compensation levels, so that subsequent calculation can be facilitated. Based on this, after the required electric quantity compensation level is obtained through the above steps, the embodiment further extracts the electric quantity compensation coefficient contained in the current electric quantity compensation level, and at the same time, the voltage protection point and the current protection point adapted to the current large battery can be found out from the existing battery database through the electric quantity compensation coefficient. Preferably, in the present embodiment, the electric quantity compensation coefficient, the voltage protection point and the current protection point are specific values.
Furthermore, the battery protection power adapted to the current working state of the large battery can be calculated in real time according to the voltage protection point and the current protection point, that is, the output power of the current large battery is prevented from being too large, and correspondingly, the target discharging power contained in the first working parameter and the target charging power contained in the second working parameter also need to be extracted.
Based on the above, the charging and discharging strategy adapted to the current large battery can be further calculated according to the current battery protection power, the target discharging power and the target charging power.
In addition, in this embodiment, the step of calculating the charge/discharge strategy adapted to the large battery according to the battery protection power, the target discharge power, and the target charge power includes:
calculating a target power difference between the target discharge power and the target charge power, and calculating a power ratio between the battery protection power and the target power difference;
and multiplying the power ratio by the electric quantity compensation coefficient to obtain a corresponding actual electric quantity compensation factor, and multiplying the target discharge power by the actual electric quantity compensation factor to obtain a corresponding actual electric quantity compensation power.
In addition, in this embodiment, it should be noted that, after the required target discharge power and the target charge power are obtained through the above steps, it is necessary to further calculate a target power difference between the current target discharge power and the current target charge power, and at the same time, calculate a power ratio between the current battery protection power and the current target power difference, and specifically, the power ratio may reflect a power performance difference between the large battery and the small battery, so as to protect the large battery and the small battery.
Further, the current power ratio is multiplied by the electric quantity compensation coefficient, so that the required actual electric quantity compensation factor can be obtained, and finally, the required actual electric quantity compensation power can be accurately obtained only by multiplying the current actual electric quantity compensation factor by the target discharge power.
In addition, in this embodiment, it should be further noted that the step of adjusting the charge/discharge switch, the equalization switch, and the precharge switch in the large battery by the BMS according to the charge/discharge policy includes:
and acquiring power values corresponding to the charge-discharge switch, the balance switch and the pre-charge switch respectively, and adjusting the power values by opening or closing the charge-discharge switch, the balance switch and the pre-charge switch so as to enable the adjusted power values to be matched with the actual electric quantity supplement power.
In addition, in this embodiment, it should be further noted that, because each switch provided in this embodiment is provided with a corresponding power value, that is, the power value corresponding to the function that each switch is started is different, based on this, after the required actual electric quantity supplementary power is obtained through the above steps, at this time, various switches inside the large battery need to be correspondingly adjusted, that is, the charge-discharge switch, the equalization switch and the pre-charge switch need to be adjusted, so that the power value corresponding to the adjusted switch is adapted to the current actual electric quantity supplementary power.
In this embodiment, it should be noted that, the actual power supplied by this embodiment is a specific value.
In this embodiment, it should be noted that the step of converting the electric energy of the large battery into the electric energy of the small battery by the DCDC converter to supplement the electric energy of the small battery includes:
acquiring conversion data generated in real time by the DCDC converter, and calculating a heat value and a loss value generated in the charging process of the small battery in real time according to the conversion data;
and judging whether a heat dissipation system is started or not according to the heat value and the loss value based on a preset rule, wherein the heat dissipation system is used for dissipating heat of the large battery and the small battery.
In this embodiment, it should be noted that, in order to avoid that the heat generated by the DCDC converter in the process of converting the electric energy in the large battery into the small battery is too high, the present embodiment further obtains the conversion data generated by the present DCDC converter in real time, and calculates the heat value and the loss value generated by the present small battery in the charging process in real time according to the present conversion data.
Based on the above, whether the generated heat value and the loss value are larger than the preset heat value and the loss value or not is judged in real time, and specifically, if yes, a heat dissipation system in the current vehicle is immediately started, so that corresponding heat dissipation is carried out on the current large battery and the current small battery through the heat dissipation system.
In this embodiment, it should be noted that, the method further includes:
detecting running conditions of the vehicle in real time, wherein the running conditions comprise a high-speed condition, a low-speed condition and a parking condition;
when the vehicle is detected to be in a low-speed working condition or the parking working condition, the actual electric quantity supplementing power is reduced in a self-adaptive mode;
and when the vehicle is detected to be in a high-speed working condition, adaptively increasing the actual electric quantity supplementing power.
In this embodiment, it should be noted that, in order to adjust the magnitude of the actual electric quantity supplementary power in real time during the running process of the vehicle, so as to avoid wasting of resources, the running condition of the vehicle, that is, a high-speed condition, a low-speed condition or a parking condition, is also detected in real time, where it should be noted that, when the vehicle is at a constant speed, the magnitude of the actual electric quantity supplementary power is unchanged.
Further, if the vehicle is detected to be in a low-speed working condition or a parking working condition, the current actual electric quantity supplementing power needs to be correspondingly reduced;
correspondingly, if the vehicle is detected to be in a high-speed working condition, the actual electric quantity supplementing power needs to be correspondingly increased.
It should be noted that, for the sake of brevity, the method according to the second embodiment of the present invention, which implements the same principle and some of the technical effects as the first embodiment, is not mentioned here, and reference is made to the corresponding content provided by the first embodiment.
In summary, the battery power management method provided by the embodiment of the invention can effectively avoid the phenomenon of power shortage of the small battery, so that the problem that the vehicle cannot be started is avoided, and the use experience of a user is correspondingly improved.
Referring to fig. 2, a battery power management system according to a third embodiment of the present invention is shown, the system includes:
the judging module 12 is configured to detect, in real time, a first remaining capacity corresponding to a large battery and a second remaining capacity corresponding to a small battery in the vehicle-mounted battery system, and judge whether a difference between the first remaining capacity and the second remaining capacity is greater than a preset threshold;
the calculating module 22 is configured to obtain a first working parameter generated at the current time of the large battery and a second working parameter generated at the current time of the small battery if the difference between the first remaining power and the second remaining power is greater than the preset threshold, and calculate a charge-discharge strategy adapted to the large battery according to the first working parameter and the second working parameter;
and the adjusting module 32 is configured to transmit the charge-discharge strategy to the BMS, so that the BMS adjusts the charge-discharge switch, the equalizing switch and the pre-charge switch in the large battery according to the charge-discharge strategy, and converts the electric energy of the large battery into the electric energy of the small battery through the DCDC converter to supplement the electric energy of the small battery.
In the above battery power management system, the computing module 22 is specifically configured to:
extracting a first SOC value corresponding to the first residual electric quantity and a second SOC value corresponding to the second residual electric quantity, and calculating a target difference value between the first SOC value and the second SOC value;
determining a target threshold corresponding to the target difference value, wherein the target threshold is larger than the preset threshold, and the target threshold corresponds to an electric quantity compensation level;
and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter based on the electric quantity compensation grade.
In the above battery power management system, the computing module 22 is further specifically configured to:
extracting an electric quantity compensation coefficient contained in the electric quantity compensation grade, and determining a voltage protection point and a current protection point which are matched with the large battery according to the electric quantity compensation coefficient;
calculating battery protection power corresponding to the large battery according to the voltage protection point and the current protection point, and extracting target discharge power contained in the first working parameter and target charging power contained in the second working parameter;
And calculating a charging and discharging strategy matched with the large battery according to the battery protection power, the target discharging power and the target charging power.
In the above battery power management system, the computing module 22 is further specifically configured to:
calculating a target power difference between the target discharge power and the target charge power, and calculating a power ratio between the battery protection power and the target power difference;
and multiplying the power ratio by the electric quantity compensation coefficient to obtain a corresponding actual electric quantity compensation factor, and multiplying the target discharge power by the actual electric quantity compensation factor to obtain a corresponding actual electric quantity compensation power.
In the above battery power management system, the adjusting module 32 is specifically configured to:
and acquiring power values corresponding to the charge-discharge switch, the balance switch and the pre-charge switch respectively, and adjusting the power values by opening or closing the charge-discharge switch, the balance switch and the pre-charge switch so as to enable the adjusted power values to be matched with the actual electric quantity supplement power.
In the above battery power management system, the adjusting module 32 is further specifically configured to:
acquiring conversion data generated in real time by the DCDC converter, and calculating a heat value and a loss value generated in the charging process of the small battery in real time according to the conversion data;
and judging whether a heat dissipation system is started or not according to the heat value and the loss value based on a preset rule, wherein the heat dissipation system is used for dissipating heat of the large battery and the small battery.
In the above battery power management system, the battery power management system further includes a detection module 42, where the detection module 42 is specifically configured to:
detecting running conditions of the vehicle in real time, wherein the running conditions comprise a high-speed condition, a low-speed condition and a parking condition;
when the vehicle is detected to be in a low-speed working condition or the parking working condition, the actual electric quantity supplementing power is reduced in a self-adaptive mode;
and when the vehicle is detected to be in a high-speed working condition, adaptively increasing the actual electric quantity supplementing power.
A fourth embodiment of the present invention provides a computer including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the battery power management method provided in the above embodiments when executing the computer program.
A fifth embodiment of the present invention provides a readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the battery level management method as provided in the above embodiments.
In summary, the battery power management method, system, computer and readable storage medium provided by the embodiments of the present invention can effectively avoid the phenomenon of power shortage of the small battery, so that the problem that the vehicle cannot be started is avoided, and the use experience of the user is correspondingly improved.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. A method of battery power management, the method comprising:
Detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in an on-vehicle battery system in real time, and judging whether a difference value between the first residual capacity and the second residual capacity is larger than a preset threshold value or not;
if the difference value between the first residual electric quantity and the second residual electric quantity is larger than the preset threshold value, acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery, and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter;
transmitting the charging and discharging strategy to a BMS, so that the BMS adjusts a charging and discharging switch, an equalizing switch and a pre-charging switch in the large battery according to the charging and discharging strategy, and converts the electric energy of the large battery into the electric energy of the small battery through a DCDC converter so as to supplement the electric quantity of the small battery;
the step of calculating the charge-discharge strategy adapted to the large battery according to the first working parameter and the second working parameter comprises the following steps:
extracting a first SOC value corresponding to the first residual electric quantity and a second SOC value corresponding to the second residual electric quantity, and calculating a target difference value between the first SOC value and the second SOC value;
Determining a target threshold corresponding to the target difference value, wherein the target threshold is larger than the preset threshold, and the target threshold corresponds to an electric quantity compensation level;
based on the electric quantity compensation grade, calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter;
the step of calculating the charge-discharge strategy adapted to the large battery according to the first working parameter and the second working parameter based on the electric quantity compensation level comprises the following steps:
extracting an electric quantity compensation coefficient contained in the electric quantity compensation grade, and determining a voltage protection point and a current protection point which are matched with the large battery according to the electric quantity compensation coefficient;
calculating battery protection power corresponding to the large battery according to the voltage protection point and the current protection point, and extracting target discharge power contained in the first working parameter and target charging power contained in the second working parameter;
and calculating a charging and discharging strategy matched with the large battery according to the battery protection power, the target discharging power and the target charging power.
2. The battery power management method according to claim 1, wherein: the step of calculating a charge-discharge strategy adapted to the large battery according to the battery protection power, the target discharge power and the target charge power comprises the following steps:
Calculating a target power difference between the target discharge power and the target charge power, and calculating a power ratio between the battery protection power and the target power difference;
and multiplying the power ratio by the electric quantity compensation coefficient to obtain a corresponding actual electric quantity compensation factor, and multiplying the target discharge power by the actual electric quantity compensation factor to obtain a corresponding actual electric quantity compensation power.
3. The battery power management method according to claim 2, wherein: the step of enabling the BMS to adjust the charge-discharge switch, the equalization switch and the pre-charge switch in the large battery according to the charge-discharge strategy comprises the following steps:
and acquiring power values corresponding to the charge-discharge switch, the balance switch and the pre-charge switch respectively, and adjusting the power values by opening or closing the charge-discharge switch, the balance switch and the pre-charge switch so as to enable the adjusted power values to be matched with the actual electric quantity supplement power.
4. The battery power management method according to claim 1, wherein: the step of converting the electric energy of the large battery into the electric energy of the small battery through the DCDC converter to supplement the electric quantity of the small battery comprises the following steps:
Acquiring conversion data generated in real time by the DCDC converter, and calculating a heat value and a loss value generated in the charging process of the small battery in real time according to the conversion data;
and judging whether a heat dissipation system is started or not according to the heat value and the loss value based on a preset rule, wherein the heat dissipation system is used for dissipating heat of the large battery and the small battery.
5. A battery level management method according to claim 3, wherein: the method further comprises the steps of:
detecting running conditions of the vehicle in real time, wherein the running conditions comprise a high-speed condition, a low-speed condition and a parking condition;
when the vehicle is detected to be in a low-speed working condition or the parking working condition, the actual electric quantity supplementing power is reduced in a self-adaptive mode;
and when the vehicle is detected to be in a high-speed working condition, adaptively increasing the actual electric quantity supplementing power.
6. A battery level management system for implementing the battery level management method of any one of claims 1-5, the system comprising:
the judging module is used for detecting a first residual capacity corresponding to a large battery and a second residual capacity corresponding to a small battery in the vehicle-mounted battery system in real time and judging whether the difference value between the first residual capacity and the second residual capacity is larger than a preset threshold value or not;
The calculation module is used for acquiring a first working parameter generated at the current moment of the large battery and a second working parameter generated at the current moment of the small battery if the difference value between the first residual electric quantity and the second residual electric quantity is larger than the preset threshold value, and calculating a charging and discharging strategy matched with the large battery according to the first working parameter and the second working parameter;
and the adjusting module is used for transmitting the charging and discharging strategy to the BMS, so that the BMS adjusts the charging and discharging switch, the equalizing switch and the pre-charging switch in the large battery according to the charging and discharging strategy, and converts the electric energy of the large battery into the electric energy of the small battery through the DCDC converter so as to supplement the electric quantity of the small battery.
7. A computer comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the battery level management method of any one of claims 1 to 5 when the computer program is executed.
8. A readable storage medium having stored thereon a computer program, which when executed by a processor implements the battery level management method according to any one of claims 1 to 5.
CN202310748481.3A 2023-06-25 2023-06-25 Battery power management method, system, computer and readable storage medium Active CN116488312B (en)

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