CN112440826A - New energy vehicle power distribution method and system - Google Patents

New energy vehicle power distribution method and system Download PDF

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Publication number
CN112440826A
CN112440826A CN202011245197.7A CN202011245197A CN112440826A CN 112440826 A CN112440826 A CN 112440826A CN 202011245197 A CN202011245197 A CN 202011245197A CN 112440826 A CN112440826 A CN 112440826A
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value
current
soc
dcr
matrix table
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CN112440826B (en
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何剑
李平
吴玉锋
刘鹏
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Soundon New Energy Technology Co Ltd
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Soundon New Energy Technology Co Ltd
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    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of 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
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The application discloses new energy vehicle power distribution method and system, output power of a battery system of a new energy vehicle is adjusted through a change rule of DCR and SOC and a rule of SOC and output power value, aging of the battery system is slowed down, and the service life of the new energy vehicle is prolonged. The method comprises the following steps: acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC; when the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system; calculating to obtain a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table; and controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.

Description

New energy vehicle power distribution method and system
Technical Field
The invention relates to the field of new energy vehicles, in particular to a power distribution method and system for a new energy vehicle.
Background
At present, the human social environment is seriously damaged, fossil energy is increasingly exhausted, in order to improve the current situation, various countries in the world begin to limit the manufacture and use of fuel vehicles, new energy vehicles are vigorously developed, and in order to produce new energy vehicles with more excellent performance, the design of the most critical part power battery of the pure electric new energy vehicles is particularly critical.
The power distribution of a battery system of a new energy vehicle is an important work, because the abuse of the battery can be effectively prevented, the service life of the battery is prolonged, and a plurality of fault alarms can be prevented.
The available power of the battery for different electric quantities at different stages is different according to the experiment and long-time tracking of the battery, for the battery which is newly delivered from factory, the power distribution of the battery can be set by a direct detection mode, however, after long-term use, the lithium ion deintercalation concentration in the lithium battery can be changed, irreversible chemical reaction is generated, polarization is increased, so after a long time of use, the power consumption of the vehicle theoretically needs to be reduced correspondingly, but in the current discharging strategy of the battery management system, the power consumption is often not increased along with the degree of use, the regulation and limitation of the power usage of the vehicle, which results in a vicious circle, the longer the usage time, the lower the actual available power should be, and if the vehicle is used according to the earliest used power, the vehicle can be aged more quickly, and the service life of the new energy vehicle is shortened.
Disclosure of Invention
The invention aims to provide a power distribution method and a power distribution system for a new energy vehicle, which are used for regulating the output power of a battery system of the new energy vehicle through the change rule of a DCR and an SOC and the rule of the SOC and an output power value, slowing down the aging of the battery system and prolonging the service life of the new energy vehicle.
The invention provides a power distribution method for a new energy vehicle, which comprises the following steps:
acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
when the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system;
calculating to obtain a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table;
and controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
With reference to the first aspect of the present invention, in a first implementation manner of the first aspect of the present invention, the calculating the real-time output power value according to the current temperature, the current SOC, the DCR matrix table, and the discharge power matrix table includes:
setting an SOC threshold value according to a preset power output rule;
judging whether the value of the current SOC at the current temperature is smaller than an SOC threshold value or not;
if not, obtaining a factory output power value from the discharge power matrix table according to the current temperature and the current SOC, and calculating to obtain a real-time output power value according to the factory output power value and the SOH (state of health) of the battery;
if the current temperature is lower than the current temperature, obtaining a current DCR value from a DCR matrix table according to the current temperature and the current SOC;
collecting the current voltage value, the lowest available voltage value and the current value of a single battery of a battery system;
and calculating to obtain the real-time output power value according to the current voltage value, the lowest available voltage value, the current value and the current DCR value.
With reference to the first aspect of the present invention, in a second aspect of the present invention, a method for calculating a real-time output power value according to a current voltage value, a lowest available voltage value, a current value and a current DCR value includes:
multiplying the current value by the square of the current voltage value to obtain a first value;
multiplying the current value by the current voltage value and the lowest available voltage value to obtain a second value;
and subtracting the second value from the first value, and dividing the second value by the current DCR value to obtain a real-time output power value.
With reference to the first implementation manner of the first aspect of the present invention, in a third implementation manner of the first aspect of the present invention, before obtaining the current DCR value from the DCR matrix table according to the current temperature and the current SOC, the method further includes:
when the value of the current SOC is smaller than the SOC threshold value, dividing at least two SOC nodes according to a preset SOC percentage;
when the current SOC is at the current SOC node, judging whether the new energy vehicle between the current SOC node and the previous SOC node has speed change action;
if the change of the speed of the motor is over, acquiring a voltage value and a current value before and after the speed change action, calculating to obtain an updated DCR value, and replacing the updated DCR value into a DCR matrix table;
acquiring the current voltage value, the lowest available voltage value and the current value of a single battery of the battery system, calculating to obtain an updated output power value according to the current voltage value, the lowest available voltage value, the current value and the updated DCR value, and replacing the updated output power value into a discharge power matrix table;
if not, the DCR matrix table and the discharge power matrix table are not updated.
With reference to any one of the first aspect to the third aspect of the present invention, in the fourth aspect of the present invention, after controlling the battery system to allocate power to the new energy vehicle according to the real-time output power value, the method further includes:
when the new energy vehicle stops driving, recording as the first driving of a driving cycle, wherein the driving cycle comprises at least two driving;
when the new energy vehicle starts to drive in a driving cycle, the real-time output power value is continuously used for controlling the battery system to distribute power to the new energy vehicle;
when the new energy vehicle starts to drive outside the driving cycle, the output power value is recalculated.
The second aspect of the present invention provides a new energy vehicle power distribution system, including:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and the output power at the SOC;
the detection module is used for detecting the current SOC and the current temperature of the battery system when the new energy vehicle starts to drive;
the calculation module is used for calculating to obtain a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table;
and the power distribution module is used for controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
In combination with the second aspect of the present invention, in the first embodiment of the second aspect of the present invention,
the calculation module is specifically used for setting an SOC threshold value according to a preset power output rule;
the calculation module is also used for judging whether the value of the current SOC at the current temperature is smaller than the SOC threshold value;
the calculation module is further used for obtaining a factory output power value from the discharge power matrix table according to the current temperature and the current SOC if the value of the current SOC is not less than the SOC threshold value, and calculating a real-time output power value according to the factory output power value and the SOH (state of health) of the battery;
the calculation module is also used for obtaining a current DCR value from the DCR matrix table according to the current temperature and the current SOC if the value of the current SOC is smaller than the SOC threshold value;
the calculation module is also used for acquiring the current voltage value, the lowest available voltage value and the current value of the single battery of the battery system;
and the calculating module is also used for calculating to obtain the real-time output power value according to the current voltage value, the lowest available voltage value, the current value and the current DCR value.
In combination with the first embodiment of the second aspect of the present invention, in the second embodiment of the second aspect of the present invention,
the calculation module is also used for multiplying the current value by the square of the current voltage value to obtain a first value;
the calculation module is also used for multiplying the current value by the current voltage value and the lowest available voltage value to obtain a second value;
and the calculating module is also used for subtracting the second value from the first value and dividing the second value by the current DCR value to obtain the real-time output power value.
In combination with the first embodiment of the second aspect of the present invention, in a third embodiment of the second aspect of the present invention,
the calculation module is also used for dividing at least two SOC nodes according to a preset SOC percentage when the value of the current SOC is smaller than the SOC threshold;
the calculation module is also used for judging whether the new energy vehicle has over-speed change action between the current SOC node and the previous SOC node when the current SOC is at the current SOC node;
the calculation module is also used for acquiring voltage values and current values before and after the speed change action if the change action occurs, calculating to obtain an updated DCR value, and replacing the updated DCR value into a DCR matrix table;
the calculation module is also used for acquiring the current voltage value, the lowest available voltage value and the current value of the single battery of the battery system, calculating an updated output power value according to the current voltage value, the lowest available voltage value, the current value and the updated DCR value, and replacing the updated output power value into the discharge power matrix table;
and the calculation module is also used for not updating the DCR matrix table and the discharge power matrix table if the DCR matrix table and the discharge power matrix table do not occur.
With reference to any one of the first embodiment of the second aspect of the present invention through the third embodiment of the second aspect of the present invention, in a fourth embodiment of the second aspect of the present invention,
the power distribution module is further used for recording the first driving of the driving cycle when the new energy vehicle stops driving, and the driving cycle comprises at least two driving;
the power distribution module is further used for continuously using the real-time output power value to control the battery system to distribute power to the new energy vehicle when the new energy vehicle starts to drive in a driving cycle;
and the power distribution module is also used for recalculating the output power value when the new energy vehicle starts to drive outside the driving cycle.
As can be seen from the above, in the new energy vehicle power distribution method of the present invention, a direct Current internal Resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle are obtained, the DCR matrix table is used to indicate a relationship between electric quantities (states of Charge, SOC) and DCRs at different temperatures, and the discharge power matrix table is used to indicate output power magnitudes at different temperatures and SOCs. In the process of controlling the battery system to distribute the power to the new energy vehicle, the real-time output power value considers the DCR matrix table and the discharge power matrix table and combines the change rule of the DCR and the SOC and the rule of the SOC and the output power value, so that compared with the existing power distribution method, the output power of the battery system of the new energy vehicle is adjusted through the change rule of the DCR and the SOC and the rule of the SOC and the output power value, the aging of the battery system is slowed down, and the service life of the new energy vehicle is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a new energy vehicle power distribution method provided by the present invention;
FIG. 2 is a schematic flow chart illustrating another embodiment of a power distribution method for a new energy vehicle provided by the present invention;
FIG. 3 is a schematic flow chart of a power distribution method for a new energy vehicle according to another embodiment of the invention;
FIG. 4 is a schematic flow chart illustrating a power distribution method for a new energy vehicle according to still another embodiment of the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a new energy vehicle power distribution system provided by the invention.
Detailed Description
The core of the invention is to provide a new energy vehicle power distribution method and system, the output power of a battery system of the new energy vehicle is adjusted through the change rule of DCR and SOC and the rule of SOC and output power value, the aging of the battery system is slowed down, and the service life of the new energy vehicle is prolonged.
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
The embodiments of the present application are written in a progressive manner.
Referring to fig. 1, an embodiment of the invention provides a power distribution method for a new energy vehicle, including:
101. acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
in this embodiment, the DCR matrix table is used to indicate a relationship between the SOC and the DCR at different temperatures, and the discharge power matrix table is used to indicate output power at different temperatures and at different SOCs, and of course, both the DCR matrix table and the discharge power matrix table are obtained through a battery cell test. For example, a certain battery cell is selected, and a relation table of SOC and DCR at different temperatures of the battery cell, that is, a charging DCR matrix table, is obtained through a battery cell experiment, as shown in table 1 below, where only data of part of temperature T and SOC are displayed, and a value unit of DCR is m Ω.
TABLE 1
T/SOC 0％ 10％ 30％ 50％ 60％ 70％ 80％ Voltage window
0℃ 5.067 5.367 5.828 5.930 5.987 5.915 6.043 3.0-4.35V
25℃ 2.372 2.572 3.000 2.852 2.836 3.000 3.131 3.0-4.35V
40℃ 2.03 2.63 2.255 2.106 2.085 2.174 2.210 3.0-4.35V
The discharge power matrix table is shown in table 2 below, in which only data of a partial temperature T and SOC are shown, and a unit of a value of the output power is W.
TABLE 2
T/SOC 0％ 10％ 30％ 50％ 60％ 70％ 80％ Voltage window
0℃ 0 265.1 357.8 434.8 483.6 535.8 585.0 3.0-4.35V
25℃ 0 478.0 759.6 857.7 900.6 961.6 1080.4 3.0-4.35V
40℃ 0 496.2 882.8 1002.7 1043.4 1124.1 1272.1 3.0-4.35V
102. When the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system;
in this embodiment, when the new energy vehicle starts driving, the current SOC and the current temperature of the battery system are detected.
103. Calculating to obtain a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table;
in this embodiment, values corresponding to the DCR and the output power can be found in the DCR matrix table and the discharge power matrix table according to the current temperature and the current SOC, and as can be seen from tables 1 and 2, at one temperature, the change rule of the DCR and the SOC and the rule of the SOC and the output power are all reflected, and the real-time output power value can be calculated.
104. And controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
In this embodiment, when the Vehicle Control Unit (VCU) receives the real-time output power value, the Vehicle Control Unit may Control the battery system to perform power distribution on the new energy Vehicle.
In the embodiment of the invention, a DCR matrix table and a discharge power matrix table of a battery system of the new energy vehicle are obtained, when the new energy vehicle starts to drive, the current SOC and the current temperature of the battery system are detected, a real-time output power value is obtained through calculation according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table, and the battery system is controlled to carry out power distribution on the new energy vehicle according to the real-time output power value. In the process of controlling the battery system to distribute the power to the new energy vehicle, the real-time output power value considers the DCR matrix table and the discharge power matrix table and combines the change rule of the DCR and the SOC and the rule of the SOC and the output power value, so that compared with the existing power distribution method, the output power of the battery system of the new energy vehicle is adjusted through the change rule of the DCR and the SOC and the rule of the SOC and the output power value, the aging of the battery system is slowed down, and the service life of the new energy vehicle is prolonged.
Since the lithium ion deintercalation concentration in the lithium battery Of the battery system Of the new energy vehicle changes after a long time use, an irreversible chemical reaction is generated, and polarization is increased, and therefore, after a long time use, the power consumption Of the vehicle also needs to be reduced in theory, and therefore, in the calculation process Of the real-time output power value, the State Of Health (SOH) Of the battery and the condition Of the single battery need to be considered, and the following detailed description will be made by embodiments.
Referring to fig. 2, an embodiment of the invention provides a power distribution method for a new energy vehicle, including:
201. acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
please refer to step 101 of the embodiment shown in fig. 1 for details.
202. When the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system;
203. setting an SOC threshold value according to a preset power output rule;
in this embodiment, since the negative electrode of the battery is saturated with lithium, the discharge capacity and the power are less affected at the stage of 50% to 100%, and therefore, 50% is used as the SOC threshold.
204. Judging whether the value of the current SOC at the current temperature is smaller than the SOC threshold value, if not, executing the step 205; if so, go to step 206;
in this embodiment, it is determined whether the value of the current SOC is smaller than the SOC threshold at the current temperature, and step 205 is executed when 50% to 100%; below 50%, step 206 is performed.
205. Obtaining a factory output power value from a discharge power matrix table according to the current temperature and the current SOC, and calculating to obtain a real-time output power value according to the factory output power value and the SOH;
in this embodiment, according to the current temperature and the current SOC, assuming that the current temperature is 25 ℃ and the current SOC is 60%, in table 2, the corresponding factory output power value is 900.6W, and if the battery is used for a long time and the available power is reduced, the state of health SOH of the battery needs to be considered, and assuming that the SOH is 0.8, the real-time output power value is 900.6W — 0.8 — 720.64W.
206. Obtaining a current DCR value from a DCR matrix table according to the current temperature and the current SOC;
in this embodiment, when the current SOC value is less than 50%, the current temperature and the current SOC obtain the current DCR value from the DCR matrix table, and if the current temperature is 25 ℃ and the current SOC is 30%, in table 1, the corresponding current DCR value is 3.000m Ω.
207. Collecting the current voltage value, the lowest available voltage value and the current value of a single battery of a battery system;
in this embodiment, through detection, the current voltage value, the lowest available voltage value, and the current value of the battery cell of the battery system may be collected.
208. Calculating to obtain a real-time output power value according to the current voltage value, the lowest available voltage value, the current value and the current DCR value;
in this embodiment, the real-time output power value is calculated according to the current voltage value, the lowest available voltage value, the current value, and the current DCR value, and the specific calculation method may be:
the current value I1CMultiplied by the current voltage value UX％To obtain a first value I1CUX％ 2，
The current value I1CMultiplied by the current voltage value UX％And the lowest usable voltage value UminObtaining a second value I1CUminUX％，
The first value I1CUX％ 2Minus a second value I1CUminUX％And divided by the current DCR value DCRX％To obtain real-time output power WX％＝(I1CUX％ 2-I1CUminUX％)/DCRX％。
209. And controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
In this embodiment, when the VCU receives the real-time output power value, the battery system may be controlled to perform power distribution on the new energy vehicle.
In the embodiment of the present invention, the manners of acquiring the real-time output power values when the current SOC is not less than the SOC threshold and is less than the SOC threshold are respectively explained, and when the current SOC is not less than the SOC threshold, the SOH needs to be considered; when the current SOC is smaller than the SOC threshold, the current voltage value, the lowest available voltage value, and the current value of the battery cell need to be considered. Therefore, the risk that the service life of a battery system is reduced because the SOH and the single battery have problems and the output power is not adjusted after the battery is used for a long time is avoided.
In the embodiment shown in fig. 2, when the value of the current SOC is smaller than the SOC threshold, the real-time output power value is calculated, and the parameters of the battery cells can be directly measured, so that the current DCR value belongs to a key variable, and when the available power of the battery is reduced, the DCR value is changed, and therefore needs to be updated, when the new energy vehicle runs smoothly, the available power consumption of the battery is stable, and only when a brake or an accelerator action occurs, the consumed power is changed greatly, and the real-time output power value needs to be recalculated. The following examples are intended to illustrate the details.
Referring to fig. 3, an embodiment of the invention provides a power distribution method for a new energy vehicle, including:
301. acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
please refer to step 101 of the embodiment shown in fig. 1 for details.
302. When the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system;
303. setting an SOC threshold value according to a preset power output rule;
in this embodiment, since the negative electrode of the battery is saturated with lithium, the discharge capacity and the power are less affected at the stage of 50% to 100%, and therefore, 50% is used as the SOC threshold.
304. Judging whether the value of the current SOC at the current temperature is smaller than an SOC threshold value, if not, executing a step 305; if so, go to step 306;
in this embodiment, it is determined whether the value of the current SOC is smaller than the SOC threshold at the current temperature, and when 50% to 100%, step 305 is executed; below 50%, step 306 is performed.
305. Obtaining a factory output power value from a discharge power matrix table according to the current temperature and the current SOC, and calculating to obtain a real-time output power value according to the factory output power value and the SOH;
in this embodiment, according to the current temperature and the current SOC, assuming that the current temperature is 25 ℃ and the current SOC is 60%, in table 2, the corresponding factory output power value is 900.6W, and if the battery is used for a long time and the available power is reduced, the state of health SOH of the battery needs to be considered, and assuming that the SOH is 0.8, the real-time output power value is 900.6W — 0.8 — 720.64W.
306. Dividing at least two SOC nodes according to a preset SOC percentage;
in this embodiment, when the current SOC is less than 50%, the at least two SOC nodes are divided according to a preset SOC percentage, where the preset SOC percentage may be 5% or 10%, and is not particularly limited.
307. When the current SOC is at the current SOC node, judging whether the new energy vehicle between the current SOC node and the previous SOC node has speed change action, and if so, executing the step 308; if not, go to step 310;
in this embodiment, when the current SOC is at the current SOC node, it is determined whether a speed change action has occurred in the new energy vehicle between the current SOC node and the previous SOC node, where the speed change action includes a brake and an accelerator, and if one or both of the speed change actions have occurred, a speed change action is present, and step 308 is executed; if no, no shifting action is performed and step 310 is executed.
308. Acquiring voltage values and current values before and after speed change action, calculating to obtain an updated DCR value, and replacing the updated DCR value into a DCR matrix table;
in this embodiment, the voltage value and the current value before and after the speed change operation are obtained, and the updated DCR value is calculated, where the expression is DCRX％＝(UFront side-URear end)/(IFront side-IRear end) And replacing the recalculated updated DCR value into a DCR matrix table, namely corresponding the DCR value corresponding to the current SOC to the updated DCR value.
309. Acquiring the current voltage value, the lowest available voltage value and the current value of a single battery of the battery system, calculating to obtain an updated output power value according to the current voltage value, the lowest available voltage value, the current value and the updated DCR value, and replacing the updated output power value into a discharge power matrix table;
in this embodiment, after determining the updated DCR value, an updated output power value is obtained by calculation using a calculation formula of the output power value, the updated output power value is replaced in the discharge power matrix table, and the output power value corresponding to the current SOC corresponds to the updated output power value.
310. Not updating the DCR matrix table and the discharge power matrix table;
in this embodiment, the operations of step 308 and step 309 do not need to be executed without the occurrence of the shifting operation, and the DCR matrix table and the discharge power matrix table are not updated.
311. Obtaining a current DCR value from a DCR matrix table according to the current temperature and the current SOC;
in this embodiment, the current DCR value is obtained from the DCR matrix table according to the current temperature and the current SOC, and at this time, if the DCR matrix table and the discharge power matrix table are updated, the obtained current DCR value is an updated DCR value; if the DCR matrix table and the discharge power matrix table are not updated, the current DCR value is not an updated DCR value.
312. Collecting the current voltage value, the lowest available voltage value and the current value of a single battery of a battery system;
313. calculating to obtain a real-time output power value according to the current voltage value, the lowest available voltage value, the current value and the current DCR value;
in this embodiment, if the DCR matrix table and the discharge power matrix table are updated, the calculated real-time output power value is the updated output power value; and if the DCR matrix table and the discharge power matrix table are not updated, the calculated real-time output power value is not equal to the updated output power value.
314. And controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
In this embodiment, when the VCU receives the real-time output power value, the battery system may be controlled to perform power distribution on the new energy vehicle.
In the embodiment of the invention, under the condition that the value of the current SOC is smaller than the SOC threshold value, if the change of the consumed power is large when the speed change action of a brake or an accelerator occurs, the DCR value and the output power need to be recalculated, and the DCR matrix table and the discharge power matrix table are updated, so that the real-time output power value is more accurate.
Referring to fig. 4, an embodiment of the invention provides a power distribution method for a new energy vehicle, including:
401. acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
please refer to step 101 of the embodiment shown in fig. 1 for details.
402. When the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system;
403. setting an SOC threshold value according to a preset power output rule;
in this embodiment, since the negative electrode of the battery is saturated with lithium, the discharge capacity and the power are less affected at the stage of 50% to 100%, and therefore, 50% is used as the SOC threshold.
404. Judging whether the value of the current SOC at the current temperature is smaller than an SOC threshold value, if not, executing a step 405; if so, go to step 406;
in this embodiment, it is determined whether the value of the current SOC is smaller than the SOC threshold at the current temperature, and when 50% to 100%, step 305 is executed; below 50%, step 306 is performed.
405. Obtaining a factory output power value from a discharge power matrix table according to the current temperature and the current SOC, and calculating to obtain a real-time output power value according to the factory output power value and the SOH;
in this embodiment, according to the current temperature and the current SOC, assuming that the current temperature is 25 ℃ and the current SOC is 60%, in table 2, the corresponding factory output power value is 900.6W, and if the battery is used for a long time and the available power is reduced, the state of health SOH of the battery needs to be considered, and assuming that the SOH is 0.8, the real-time output power value is 900.6W — 0.8 — 720.64W.
406. Dividing at least two SOC nodes according to a preset SOC percentage;
in this embodiment, when the current SOC is less than 50%, the at least two SOC nodes are divided according to a preset SOC percentage, where the preset SOC percentage may be 5% or 10%, and is not particularly limited.
407. When the current SOC is at the current SOC node, judging whether the new energy vehicle between the current SOC node and the previous SOC node has speed change action, and if so, executing step 408; if not, go to step 410;
in this embodiment, when the current SOC is at the current SOC node, it is determined whether a speed change action has occurred in the new energy vehicle between the current SOC node and the previous SOC node, where the speed change action includes a brake and an accelerator, and if one or both of the speed change actions have occurred, a speed change action is present, and step 308 is executed; if no, no shifting action is performed and step 310 is executed.
408. Acquiring voltage values and current values before and after speed change action, calculating to obtain an updated DCR value, and replacing the updated DCR value into a DCR matrix table;
in this embodiment, the voltage value and the current value before and after the speed change operation are obtained, and the updated DCR value is calculated, where the expression is DCRX％＝(UFront side-URear end)/(IFront side-IRear end) And replacing the recalculated updated DCR value into a DCR matrix table, namely corresponding the DCR value corresponding to the current SOC to the updated DCR value.
409. Acquiring the current voltage value, the lowest available voltage value and the current value of a single battery of the battery system, calculating to obtain an updated output power value according to the current voltage value, the lowest available voltage value, the current value and the updated DCR value, and replacing the updated output power value into a discharge power matrix table;
in this embodiment, after determining the updated DCR value, an updated output power value is obtained by calculation using a calculation formula of the output power value, the updated output power value is replaced in the discharge power matrix table, and the output power value corresponding to the current SOC corresponds to the updated output power value.
410. Not updating the DCR matrix table and the discharge power matrix table;
in this embodiment, the operations of step 308 and step 309 do not need to be executed without the occurrence of the shifting operation, and the DCR matrix table and the discharge power matrix table are not updated.
411. Obtaining a current DCR value from a DCR matrix table according to the current temperature and the current SOC;
in this embodiment, the current DCR value is obtained from the DCR matrix table according to the current temperature and the current SOC, and at this time, if the DCR matrix table and the discharge power matrix table are updated, the obtained current DCR value is an updated DCR value; if the DCR matrix table and the discharge power matrix table are not updated, the current DCR value is not an updated DCR value.
412. Collecting the current voltage value, the lowest available voltage value and the current value of a single battery of a battery system;
413. calculating to obtain a real-time output power value according to the current voltage value, the lowest available voltage value, the current value and the current DCR value;
in this embodiment, if the DCR matrix table and the discharge power matrix table are updated, the calculated real-time output power value is the updated output power value; and if the DCR matrix table and the discharge power matrix table are not updated, the calculated real-time output power value is not equal to the updated output power value.
414. Controlling a battery system to distribute power to the new energy vehicle according to the real-time output power value;
in this embodiment, when the VCU receives the real-time output power value, the battery system may be controlled to perform power distribution on the new energy vehicle.
415. When the new energy vehicle stops driving, recording as the first driving of a driving cycle, wherein the driving cycle comprises at least two driving;
in this embodiment, when the new energy vehicle stops driving, it is recorded that this driving is the first driving of a driving cycle, the driving cycle includes at least two driving, and the specific times are not limited, for example, 5 times, and since the number of times of using the vehicle in a short time is small and the change of the battery system is small, power recalculation is performed at intervals of 5 times, so that calculation consumption can be reduced.
416. When the new energy vehicle starts to drive in a driving cycle, the real-time output power value is continuously used for controlling the battery system to distribute power to the new energy vehicle;
in this embodiment, when the new energy vehicle starts driving within a driving cycle, the real-time output power value is continuously used to control the battery system to perform power distribution on the new energy vehicle.
417. When the new energy vehicle starts to drive outside the driving cycle, the output power value is recalculated.
In this embodiment, when the new energy vehicle starts to drive outside the driving cycle, for example, the 6 th driving, it indicates that the number of driving cycles exceeds 5 times, and the output power value needs to be recalculated, and the specific calculation process refers to step 401 and 413.
In the embodiment of the invention, a driving cycle processing mode is added, so that the output power value does not need to be recalculated as long as the use frequency of the new energy vehicle in a short time does not exceed the driving cycle specification, and the calculation consumption is reduced.
In the above embodiment, the new energy vehicle power distribution method is described, and a new energy vehicle power distribution system to which the method is applied is described below by way of an embodiment.
Referring to fig. 5, an embodiment of the invention provides a new energy vehicle power distribution system, including:
the acquiring module 501 is configured to acquire a direct current internal resistance DCR matrix table and a discharge power matrix table of a battery system of the new energy vehicle, where the DCR matrix table is used to indicate a relationship between electric quantity SOC and DCR at different temperatures, and the discharge power matrix table is used to indicate output power magnitudes at different temperatures and SOCs;
the detection module 502 is used for detecting the current SOC and the current temperature of the battery system when the new energy vehicle starts to drive;
the calculating module 503 is configured to calculate a real-time output power value according to the current temperature, the current SOC, the DCR matrix table, and the discharge power matrix table;
and the power distribution module 504 is configured to control the battery system to distribute power to the new energy vehicle according to the real-time output power value.
In the embodiment of the invention, an obtaining module 501 obtains a DCR matrix table and a discharge power matrix table of a battery system of a new energy vehicle, a detecting module 502 detects the current SOC and the current temperature of the battery system when the new energy vehicle starts driving, a calculating module 503 calculates a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table, and a power distributing module 504 controls the battery system to distribute power to the new energy vehicle according to the real-time output power value. The power distribution module 504 may be specifically a VCU, and since the DCR matrix table and the discharge power matrix table are considered in the real-time output power value in the process of controlling the battery system to distribute the power to the new energy vehicle, and the change rule of the DCR and the SOC and the rule of the SOC and the output power value are combined, compared with the existing power distribution method, the output power of the battery system of the new energy vehicle is adjusted through the change rule of the DCR and the SOC and the rule of the SOC and the output power value, so that the aging of the battery system is slowed down, and the service life of the new energy vehicle is prolonged.
Alternatively, and with reference to the embodiment shown in fig. 5, in some embodiments of the invention,
a calculating module 503, specifically configured to set an SOC threshold according to a preset power output rule;
the calculating module 503 is further configured to determine whether a value of the current SOC at the current temperature is smaller than an SOC threshold;
the calculating module 503 is further configured to, if the value of the current SOC is not less than the SOC threshold, obtain a factory output power value from the discharge power matrix table according to the current temperature and the current SOC, and calculate a real-time output power value according to the factory output power value and the state of health SOH of the battery;
the calculating module 503 is further configured to obtain a current DCR value from the DCR matrix table according to the current temperature and the current SOC if the value of the current SOC is smaller than the SOC threshold;
the calculating module 503 is further configured to collect a current voltage value, a lowest available voltage value, and a current value of a single battery of the battery system;
the calculating module 503 is further configured to calculate a real-time output power value according to the current voltage value, the lowest available voltage value, the current value, and the current DCR value.
In the embodiment of the present invention, the manners of acquiring the real-time output power values when the current SOC is not less than the SOC threshold and is less than the SOC threshold are respectively explained, and when the current SOC is not less than the SOC threshold, the SOH needs to be considered; when the current SOC is smaller than the SOC threshold, the current voltage value, the lowest available voltage value, and the current value of the battery cell need to be considered. Therefore, the risk that the service life of a battery system is reduced because the SOH and the single battery have problems and the output power is not adjusted after the battery is used for a long time is avoided.
Alternatively, and with reference to the embodiment shown in fig. 5, in some embodiments of the invention,
the calculating module 503 is further configured to multiply the current value by the square of the current voltage value to obtain a first value;
the calculating module 503 is further configured to multiply the current value by the current voltage value and the lowest available voltage value to obtain a second value;
the calculating module 503 is further configured to subtract the second value from the first value, and divide the second value by the current DCR value to obtain a real-time output power value.
In the embodiment of the present invention, the calculation module 503 calculates the real-time output power specifically by using the current value I1CMultiplied by the current voltage value UX％To obtain a first value I1CUX％ 2The current value I is adjusted1CMultiplied by the current voltage value UX％And the lowest usable voltage value UminObtaining a second value I1CUminUX％The first value I1CUX％ 2Minus a second value I1CUminUX％And divided by the current DCR value DCRX％To obtain real-time output power WX％＝(I1CUX％ 2-I1CUminUX％)/DCRX％。
Alternatively, and with reference to the embodiment shown in fig. 5, in some embodiments of the invention,
the calculating module 503 is further configured to divide at least two SOC nodes according to a preset SOC percentage when the value of the current SOC is smaller than the SOC threshold;
the calculating module 503 is further configured to, when the current SOC is located at the current SOC node, determine whether a speed change action of the new energy vehicle occurs between the current SOC node and a previous SOC node;
the calculating module 503 is further configured to, if the change occurs, obtain a voltage value and a current value before and after the speed change action, calculate an updated DCR value, and replace the updated DCR value in the DCR matrix table;
the calculating module 503 is further configured to collect a current voltage value, a lowest available voltage value, and a current value of a single battery of the battery system, calculate an updated output power value according to the current voltage value, the lowest available voltage value, the current value, and the updated DCR value, and replace the updated output power value into the discharge power matrix table;
the calculating module 503 is further configured to not update the DCR matrix table and the discharge power matrix table if the occurrence of the event does not occur.
In the embodiment of the present invention, when the value of the current SOC is smaller than the SOC threshold, if the change of the consumed power is large when the speed change of the brake or the accelerator occurs, the calculation module 503 needs to recalculate the DCR value and the output power, and update the DCR matrix table and the discharge power matrix table, so that the real-time output power value is more accurate.
Alternatively, and with reference to the embodiment shown in fig. 5, in some embodiments of the invention,
the power distribution module 504 is further configured to record a first driving of a driving cycle when the new energy vehicle stops driving, where the driving cycle includes at least two driving;
the power distribution module 504 is further configured to continue to use the real-time output power value to control the battery system to perform power distribution on the new energy vehicle when the new energy vehicle starts driving within a driving cycle;
the power distribution module 504 is further configured to recalculate the output power value when the new energy vehicle starts driving outside the driving cycle.
In the embodiment of the invention, the power distribution module 504 adds a processing mode of a driving cycle, so that the output power value does not need to be recalculated as long as the use times of the new energy vehicle in a short time do not exceed the regulation of the driving cycle, and the calculation consumption is reduced.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A new energy vehicle power distribution method is characterized by comprising the following steps:
acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, wherein the DCR matrix table is used for representing the relation between the electric quantity SOC and the DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
when the new energy vehicle starts to drive, detecting the current SOC and the current temperature of the battery system;
calculating to obtain a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table;
and controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
2. The method of claim 1, wherein calculating a real-time output power value according to the current temperature, the current SOC, the DCR matrix table, and the discharge power matrix table comprises:
setting an SOC threshold value according to a preset power output rule;
judging whether the value of the current SOC at the current temperature is smaller than the SOC threshold value or not;
if not, obtaining a factory output power value from the discharge power matrix table according to the current temperature and the current SOC, and calculating to obtain a real-time output power value according to the factory output power value and a battery state of health (SOH);
if the current temperature is lower than the current SOC, obtaining a current DCR value from the DCR matrix table according to the current temperature and the current SOC;
collecting the current voltage value, the lowest available voltage value and the current value of a single battery of the battery system;
and calculating to obtain a real-time output power value according to the current voltage value, the lowest available voltage value, the current value and the current DCR value.
3. The method of claim 2, wherein calculating a real-time output power value from the current voltage value, the lowest available voltage value, the current value, and the current DCR value comprises:
multiplying the current value by the square of the current voltage value to obtain a first value;
multiplying the current value by the current voltage value and the lowest available voltage value to obtain a second value;
and subtracting the second value from the first value, and dividing the second value by the current DCR value to obtain a real-time output power value.
4. The method of claim 2, wherein before obtaining a current DCR value from the DCR matrix table according to the current temperature and the current SOC, further comprising:
when the value of the current SOC is smaller than the SOC threshold value, dividing at least two SOC nodes according to a preset SOC percentage;
when the current SOC is at the current SOC node, judging whether the new energy vehicle has over-speed change between the current SOC node and the previous SOC node;
if the change of the speed of the motor is over, acquiring a voltage value and a current value before and after the speed change action, calculating to obtain an updated DCR value, and replacing the updated DCR value into the DCR matrix table;
acquiring a current voltage value, a lowest available voltage value and a current value of a single battery of the battery system, calculating an updated output power value according to the current voltage value, the lowest available voltage value, the current value and the updated DCR value, and replacing the updated output power value into the discharge power matrix table;
and if the discharge power is not generated, the DCR matrix table and the discharge power matrix table are not updated.
5. The method according to any one of claims 1-4, wherein after controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value, the method further comprises:
when the new energy vehicle stops driving, recording the driving as the first driving of a driving cycle, wherein the driving cycle comprises at least two driving;
when the new energy vehicle starts to drive in the driving cycle, the real-time output power value is continuously used for controlling the battery system to distribute power to the new energy vehicle;
and when the new energy vehicle starts to drive outside the driving cycle, recalculating the output power value.
6. A new energy vehicle power distribution system, comprising:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a direct current internal resistance (DCR) matrix table and a discharge power matrix table of a battery system of the new energy vehicle, the DCR matrix table is used for representing the relation between electric quantity SOC and DCR at different temperatures, and the discharge power matrix table is used for representing the output power at different temperatures and SOC;
the detection module is used for detecting the current SOC and the current temperature of the battery system when the new energy vehicle starts to drive;
the calculation module is used for calculating to obtain a real-time output power value according to the current temperature, the current SOC, the DCR matrix table and the discharge power matrix table;
and the power distribution module is used for controlling the battery system to distribute power to the new energy vehicle according to the real-time output power value.
7. The system of claim 6,
the calculation module is specifically used for setting an SOC threshold value according to a preset power output rule;
the calculation module is further configured to determine whether a value of the current SOC at the current temperature is smaller than the SOC threshold;
the calculation module is further configured to obtain a factory output power value from the discharge power matrix table according to the current temperature and the current SOC if the value of the current SOC is not less than the SOC threshold, and calculate a real-time output power value according to the factory output power value and a state of health (SOH) of the battery;
the calculation module is further configured to obtain a current DCR value from the DCR matrix table according to the current temperature and the current SOC if the value of the current SOC is smaller than the SOC threshold;
the calculation module is also used for acquiring the current voltage value, the lowest available voltage value and the current value of the single battery of the battery system;
the calculation module is further configured to calculate a real-time output power value according to the current voltage value, the lowest available voltage value, the current value, and the current DCR value.
8. The system of claim 7,
the calculation module is further configured to multiply the current value by a square of the current voltage value to obtain a first value;
the calculation module is further configured to multiply the current value by the current voltage value and the lowest available voltage value to obtain a second value;
the calculation module is further configured to subtract the second value from the first value, and divide the second value by the current DCR value to obtain a real-time output power value.
9. The system of claim 7,
the calculation module is further configured to divide at least two SOC nodes according to a preset SOC percentage when the value of the current SOC is smaller than the SOC threshold;
the calculation module is further used for judging whether the new energy vehicle has a speed change action between the current SOC node and the previous SOC node when the current SOC is at the current SOC node;
the calculation module is further configured to, if the change of the speed change operation occurs, obtain a voltage value and a current value before and after the speed change operation, calculate an updated DCR value, and replace the updated DCR value in the DCR matrix table;
the calculation module is further configured to acquire a current voltage value, a lowest available voltage value, and a current value of a single battery of the battery system, calculate an updated output power value according to the current voltage value, the lowest available voltage value, the current value, and the updated DCR value, and replace the updated output power value in the discharge power matrix table.
The calculation module is further configured to not update the DCR matrix table and the discharge power matrix table if the determination is not successful.
10. The system according to any one of claims 6-9,
the power distribution module is further used for recording the first driving of the driving cycle when the new energy vehicle stops driving, and the driving cycle comprises at least two driving;
the power distribution module is further used for continuing to use the real-time output power value to control the battery system to distribute power to the new energy vehicle when the new energy vehicle starts to drive in the driving cycle;
the power distribution module is further used for recalculating the output power value when the new energy vehicle starts to drive outside the driving cycle.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114167289A (en) * 2021-12-01 2022-03-11 中国第一汽车股份有限公司 Method and device for determining output power of battery and vehicle
CN114212001A (en) * 2021-12-08 2022-03-22 安徽江淮汽车集团股份有限公司 Full-life-cycle discharge power management method for pure electric vehicle
CN114506243A (en) * 2022-01-26 2022-05-17 北京海博思创科技股份有限公司 Power control method of vehicle-mounted battery system and vehicle-mounted battery management device
CN115648949A (en) * 2022-12-28 2023-01-31 河北长征汽车制造有限公司 Method for detecting DCIR (direct current infrared) of battery pack on line and electric automobile
CN116512980A (en) * 2023-07-04 2023-08-01 北京重理能源科技有限公司 Power distribution method, device, equipment and medium based on internal resistance of power battery

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866360A (en) * 2012-08-31 2013-01-09 惠州市亿能电子有限公司 Power battery pack allowable discharging power estimation method
US20150066405A1 (en) * 2013-08-30 2015-03-05 Ford Global Technologies, Llc Parameter and state limiting in model based battery control
US20170001534A1 (en) * 2015-06-30 2017-01-05 Hyundai Motor Company Device and method for controlling battery charge and discharge quantity in eco-friendly vehicle
CN106314170A (en) * 2016-08-18 2017-01-11 重庆长安汽车股份有限公司 Power calculation method and system for power battery system and electric vehicle
CN106842038A (en) * 2016-12-14 2017-06-13 广东恒沃动力科技有限公司 A kind of battery maximum discharge power estimation on line method
CN108919127A (en) * 2018-05-17 2018-11-30 合肥国轩高科动力能源有限公司 A kind of method of DC internal resistance under express statistic secondary cell different temperatures and SOC
CN109446584A (en) * 2018-09-30 2019-03-08 桑顿新能源科技有限公司 A kind of SOP evaluation method of battery management system to battery core Cross prevention

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866360A (en) * 2012-08-31 2013-01-09 惠州市亿能电子有限公司 Power battery pack allowable discharging power estimation method
US20150066405A1 (en) * 2013-08-30 2015-03-05 Ford Global Technologies, Llc Parameter and state limiting in model based battery control
US20170001534A1 (en) * 2015-06-30 2017-01-05 Hyundai Motor Company Device and method for controlling battery charge and discharge quantity in eco-friendly vehicle
CN106314170A (en) * 2016-08-18 2017-01-11 重庆长安汽车股份有限公司 Power calculation method and system for power battery system and electric vehicle
CN106842038A (en) * 2016-12-14 2017-06-13 广东恒沃动力科技有限公司 A kind of battery maximum discharge power estimation on line method
CN108919127A (en) * 2018-05-17 2018-11-30 合肥国轩高科动力能源有限公司 A kind of method of DC internal resistance under express statistic secondary cell different temperatures and SOC
CN109446584A (en) * 2018-09-30 2019-03-08 桑顿新能源科技有限公司 A kind of SOP evaluation method of battery management system to battery core Cross prevention

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CN114167289B (en) * 2021-12-01 2024-01-16 中国第一汽车股份有限公司 Battery output power determining method and device and vehicle
CN114212001A (en) * 2021-12-08 2022-03-22 安徽江淮汽车集团股份有限公司 Full-life-cycle discharge power management method for pure electric vehicle
CN114212001B (en) * 2021-12-08 2024-03-29 安徽江淮汽车集团股份有限公司 Full life cycle discharge power management method for pure electric vehicle
CN114506243A (en) * 2022-01-26 2022-05-17 北京海博思创科技股份有限公司 Power control method of vehicle-mounted battery system and vehicle-mounted battery management device
CN114506243B (en) * 2022-01-26 2024-01-23 北京海博思创科技股份有限公司 Power control method for vehicle-mounted battery system and vehicle-mounted battery management device
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CN116512980A (en) * 2023-07-04 2023-08-01 北京重理能源科技有限公司 Power distribution method, device, equipment and medium based on internal resistance of power battery
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