CN115503553A - Charging control method and device for power battery - Google Patents

Charging control method and device for power battery Download PDF

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Publication number
CN115503553A
CN115503553A CN202211234192.3A CN202211234192A CN115503553A CN 115503553 A CN115503553 A CN 115503553A CN 202211234192 A CN202211234192 A CN 202211234192A CN 115503553 A CN115503553 A CN 115503553A
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charging
power
battery
rate
multiplying power
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孔宁华
范浩
苏建云
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GAC Aion New Energy Automobile Co Ltd
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GAC Aion New Energy Automobile 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
    • B60L58/24—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
    • 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]
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application relates to the technical field of energy management, and provides a charging control method and device for a power battery. The method comprises the following steps: determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current power data of the power battery; determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine the smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power; and controlling the power battery to charge according to the target multiplying power. The charging control method for the power battery can reduce the local overheating risk of the battery in the charging process and improve the charging safety of the power battery.

Description

Charging control method and device for power battery
Technical Field
The application relates to the technical field of energy management, in particular to a charging control method and device for a power battery.
Background
New energy driving tools, such as new energy vehicles, typically use rechargeable power batteries to provide energy to drive. In order to improve charging efficiency and charging process safety when the power battery is charged, in the related art, a charging power meter, i.e., a charging map, that reflects the battery cell charging capability of the power battery is usually queried according to the temperature and voltage of the power battery, or the temperature and battery SOC (State of Charge) of the power battery to determine the charging rate of the power battery, so as to control the power battery to be charged according to the charging rate.
However, when the charging rate is high, such as 2C or higher, the charging rate is far higher than the cold heat exchange power of the power battery fluid, so when the power battery is controlled to be charged according to the charging rate, the power battery may be locally overheated, which affects the charging safety of the power battery.
Disclosure of Invention
The present application is directed to solving at least one of the technical problems occurring in the related art. Therefore, the charging control method for the power battery is provided, so that the local overheating risk of the battery in the charging process can be reduced, and the charging safety of the power battery is improved.
The application also provides a charging control device of the power battery.
The application also provides an electronic device.
The present application also provides a computer-readable storage medium.
According to the charge control method of the power battery of the embodiment of the first aspect of the application, the method comprises the following steps:
determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current power data of the power battery;
determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and controlling the power battery to charge according to the target multiplying power.
The method comprises the steps of determining a first charging rate corresponding to the current battery temperature and the current power data of the power battery from a charging rate table, obtaining a second charging rate corresponding to the current external temperature of the power battery from a thermal balance power meter when the first charging rate is detected to be outside a rate reduction interval, and controlling the power battery to be charged according to a smaller charging rate between the first charging rate and the second charging rate, so that when the power battery has high-rate charging capacity, the temperature of the power battery is limited not to exceed the temperature limit in a thermal balance state through the second charging rate determined by the thermal balance power meter maintaining the power battery in a thermal balance state, the local overheating risk of the battery in the charging process can be reduced, and the charging safety of the power battery is improved.
According to an embodiment of the application, determining that the first charging magnification is outside a magnification decrease interval comprises:
the first charging multiplying power is not less than the historical charging multiplying power at the previous moment, and the first charging multiplying power is determined to be outside a multiplying power descending interval;
and determining the historical charging multiplying power from a charging power meter according to the battery temperature of the power battery at the previous moment and the power data at the previous moment.
According to an embodiment of the present application, further comprising:
performing charging simulation on the power battery according to each preset charging rate, and acquiring the temperature of each battery corresponding to each preset charging rate one by one;
and determining that the battery temperature and any target external temperature in the external temperatures are in a thermal balance state, and recording the preset charging multiplying power corresponding to the battery temperature as the second charging multiplying power corresponding to the target external temperature to generate the thermal balance power meter.
According to an embodiment of the present application, further comprising:
and determining that the first charging rate is in a rate reduction interval, and acquiring a corresponding third charging rate from a linear change rate table obtained by performing linear interpolation on the charging power table according to the current battery temperature and the current electric power data of the power battery so as to determine a larger charging rate between the first charging rate and the third charging rate as the target rate.
According to an embodiment of the application, the linear change rate table is obtained by performing linear interpolation on each first charging rate in the rate reduction interval in the charging power table.
According to an embodiment of the present application, the outside temperature includes at least one of an ambient temperature and a coolant temperature of an electric vehicle on which the power electric vehicle is mounted.
According to an embodiment of the application, the power data comprises at least one of a battery voltage and a battery SOC.
According to the charge control device of power battery of the embodiment of the second aspect of this application, include:
the charging multiplying power determining module is used for determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current electric power data of the power battery;
the target multiplying power determining module is used for determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and the battery charging control module is used for controlling the power battery to be charged according to the target multiplying power.
The electronic device according to the third aspect of the present application includes a processor and a memory storing a computer program, and the processor implements the charging control method of the power battery according to any one of the embodiments when executing the computer program.
According to a fourth aspect of the present application, there is provided a computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing a method for controlling charging of a power battery according to any one of the embodiments described above.
The computer program product according to an embodiment of the fifth aspect of the application comprises: the computer program, when executed by a processor, implements a method of controlling charging of a power battery as in any of the embodiments described above.
One or more technical solutions in the embodiments of the present application have at least one of the following technical effects:
the method comprises the steps of determining a first charging rate corresponding to the current battery temperature and the current power data of the power battery from a charging rate table, obtaining a second charging rate corresponding to the current external temperature of the power battery from a thermal balance power meter when the first charging rate is detected to be outside a rate reduction interval, and controlling the power battery to be charged according to a smaller charging rate between the first charging rate and the second charging rate, so that when the power battery has high-rate charging capacity, the temperature of the power battery is limited not to exceed the temperature limit in a thermal balance state through the second charging rate determined by the thermal balance power meter maintaining the power battery in a thermal balance state, the local overheating risk of the battery in the charging process can be reduced, and the charging safety of the power battery is improved.
Furthermore, the first charging rate is compared with the historical charging rate determined according to the battery temperature at the last moment of the power battery and the power data at the last moment, and when the first charging rate is determined to be not smaller than the historical charging rate, the first charging rate is determined to be outside the rate reduction interval, so that whether the first charging rate is in the rate reduction interval or not can be rapidly determined according to the first charging rate and the historical charging rate at the last moment, and the efficiency of determining the interval where the first charging rate is located is improved.
Furthermore, the power battery is subjected to charging simulation through each preset charging multiplying factor, and a second charging multiplying factor corresponding to the external temperature is determined from each preset charging multiplying factor based on the matching result of each battery temperature obtained after simulation and each preset external temperature, so that a thermal balance power meter is generated, and therefore by means of a virtual test of charging performance simulation, actually required test quantity and resources are greatly saved, and multiplying factor boundaries under different external temperatures can be accurately determined.
Furthermore, after the first charging rate is determined to be in the rate reduction interval, according to the current battery temperature and the current electric power data of the power battery, a corresponding third charging rate is obtained from a linear change rate table obtained by performing linear interpolation on a charging power table, so that the larger charging rate between the first charging rate and the third charging rate is determined as the target rate, and therefore, when the first charging rate is in the rate reduction interval, the better charging rate can be obtained for charging, and the charging efficiency, particularly the charging efficiency of the tail end of the power battery, is improved.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a charging control method for a power battery according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a flow of generating a heat balance power table in an embodiment of the present application;
fig. 3 is a schematic flowchart of a charging control method for a power battery according to another embodiment of the present application;
fig. 4 is a schematic diagram of a geometric relationship between a value range of the charging power meter and a value range of the linear change power meter in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a charging control device for a power battery according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in 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 some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Hereinafter, the charging control method and device for the power battery provided by the embodiments of the present application will be described and explained in detail through several specific embodiments.
In one embodiment, a charging control method for a power battery is provided, and the method is applied to a controller and used for performing charging control on the power battery. The controller can be a single chip microcomputer, a control chip or a server and other control devices, the server can be an independent server or a server cluster formed by a plurality of servers, and the controller can also be a cloud server for providing basic cloud computing services such as cloud service, a cloud database, cloud computing, a cloud function, cloud storage, network service, cloud communication, middleware service, domain name service, security service, CDN (content distribution network), big data sampling point devices and artificial intelligent sampling point devices.
As shown in fig. 1, the charging control method for a power battery provided in this embodiment includes:
step 101, determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current electric power data of a power battery;
step 102, determining that the first charging multiplying power is outside a multiplying power reduction interval, and according to the current external temperature of a power battery, acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state, so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and 103, controlling the power battery to be charged according to the target multiplying power.
The method comprises the steps of determining a first charging rate corresponding to the current battery temperature and the current power data of the power battery from a charging rate table, obtaining a second charging rate corresponding to the current external temperature of the power battery from a thermal balance power meter when the first charging rate is detected to be outside a rate reduction interval, and controlling the power battery to be charged according to a smaller charging rate between the first charging rate and the second charging rate, so that when the power battery has high-rate charging capacity, the temperature of the power battery is limited not to exceed the temperature limit in a thermal balance state through the second charging rate determined by the thermal balance power meter maintaining the power battery in a thermal balance state, the local overheating risk of the battery in the charging process can be reduced, and the charging safety of the power battery is improved.
Meanwhile, the temperature of the power battery is limited not to exceed the temperature limit in the thermal balance state, so that the temperature of the battery is not too high, the charging rate of the battery is not required to be frequently reduced due to the too high temperature of the battery, continuous jump oscillation of the charging current is not caused, and the charging stability and the charging efficiency of the battery are improved.
In an embodiment, the charging power table Map _1 represents the charging capability of the battery cell provided by the battery cell supplier of the power battery according to the test, and is a basic condition for control optimization, and records a first charging rate corresponding to the battery temperature and the power data of the power battery. Wherein the power data includes at least one of a battery SOC and a battery voltage. For example, the charging power table Map _1 may be as shown in the following table:
Figure BDA0003882959990000081
the charging power meter Map _1 can be obtained through a large number of simulation charging test experiments. The temperature in the charging power meter is the battery temperature of the power battery. The SOC in the charging power meter is the battery SOC of the power battery, wherein SOC is more than 1 and more than 2 and more than 3 and more than 4 and more than 5 and more than 6 and more than 7. OCV in the charging power meter is the battery voltage of the power battery, OCV1 is larger than OCV2 and smaller than OCV3 and smaller than OCV4 and smaller than OCV5 and smaller than OCV6 and smaller than OCV7.
After acquiring the current battery temperature and the current power data of the power battery, such as the current battery temperature of the power battery through a temperature sensor, and the current battery voltage of the power battery through a voltage detector or the current battery SOC of the power battery through an SOC chip, the server searches for a first charging rate corresponding to the current battery temperature and the current power data in a charging power table Map _1 according to the acquired current battery temperature and the acquired current power data. For example, when the current battery temperature is 25 degrees and the current power data is SOC1 or OCV1, the corresponding first charging rate may be determined to be 3C from the charging power table Map _ 1.
Alternatively, according to the acquired current battery temperature and current power data, a first charging rate closest to the current battery temperature and the current power data may be searched in the charging power table Map _1 as a first charging rate corresponding to the current battery temperature and the current power data. For example, when the current battery temperature is 24 degrees, the temperature closest to the current battery temperature in the charging power table Map _1 is 25 degrees, and the SOC or OCV closest to the current power data in the charging power table Map _1 is SOC3 or OCV3, the corresponding first charging rate is determined to be 3C from the charging power table Map _ 1.
As can be seen from the above table, when the battery temperature does not exceed 15 degrees, the charging rate in the charging power table increases with the increase in the battery SOC or the battery voltage both before SOC3 or OCV3, and after SOC3 or OCV3, i.e., from SOC4 or OCV4, the charging rate in the charging power table decreases with the increase in the battery SOC or the battery voltage. Therefore, when the battery temperature is not more than 15 degrees and the power data of the power battery is less than or equal to SOC3 or OCV3, the charging rate does not fall, and at the moment, the section where the battery temperature is not more than 15 degrees and the power data of the power battery is less than or equal to the charging rate corresponding to SOC3 or OCV3 is determined as a non-rate-reduction section; and when the battery temperature does not exceed 15 ℃, and the electric power data of the power battery is greater than SOC3 or OCV3, the charging rate is in a descending trend, at the moment, the battery temperature is determined to not exceed 15 ℃, and the section where the electric power data of the power battery is greater than the charging rate corresponding to SOC3 or OCV3 is a rate descending section. Similarly, an interval in which each charging rate in the charging power table Map _1 is located may be determined.
After determining the section of each charging magnification in the charging power table Map _1, it may be determined whether the value corresponding to the first charging magnification is in the magnification reduction section when the first charging magnification is acquired from the charging power table Map _ 1. If the numerical value corresponding to the first charging multiplying power is in a multiplying power reduction interval, determining that the first charging multiplying power is in the multiplying power reduction interval; otherwise, determining that the first charging multiplying power is outside the multiplying power descending interval.
Considering the manner of determining whether the first charging rate is in the rate reduction interval by querying the charging power table Map _1, it is necessary to traverse all the charging rates in the charging power table Map _1, and if the number of the charging rates recorded in the charging power table Map _1 is too large, the efficiency of determining the interval in which the first charging rate is located may be affected. To this end, in addition to determining whether the first charging rate is in the rate reduction interval by querying the charging power table Map _1, in an embodiment, determining that the first charging rate is in the rate reduction interval includes:
the first charging multiplying power is not less than the historical charging multiplying power at the previous moment, and the first charging multiplying power is determined to be outside a multiplying power reduction interval;
and determining the historical charging multiplying power from a charging power meter according to the battery temperature of the power battery at the last moment and the power data at the last moment.
In an embodiment, after the first charging rate is obtained from the charging power table Map _1, the first charging rate may be compared with the historical charging rate obtained from the charging power table Map _1 according to the battery temperature at the previous time and the power data at the previous time of the power battery. If the first charging multiplying power is smaller than the historical charging multiplying power, the current charging multiplying power of the power battery is decreased, and at the moment, the first charging multiplying power can be determined to be in a multiplying power decreasing interval. If the first charging multiplying factor is equal to or larger than the historical charging multiplying factor, the current charging multiplying factor of the power battery is increased, and at the moment, the first charging multiplying factor can be determined to be outside the multiplying factor reduction interval.
The first charging multiplying power is compared with the historical charging multiplying power determined according to the battery temperature at the last moment of the power battery and the power data at the last moment, and when the first charging multiplying power is determined to be not smaller than the historical charging multiplying power, the first charging multiplying power is determined to be outside the multiplying power reduction interval, so that whether the first charging multiplying power is in the multiplying power reduction interval or not can be determined quickly according to the first charging multiplying power and the historical charging multiplying power at the last moment, and the efficiency of determining the interval where the first charging multiplying power is located is improved.
And when the first charging multiplying power is determined to be outside the multiplying power reduction interval, the power battery has high multiplying power charging capacity, and at the moment, according to the current external temperature of the power battery, searching a second charging multiplying power corresponding to the current external temperature from a heat balance power table recorded with the mapping relation between the external temperatures and the charging multiplying powers.
In one embodiment, the thermal equilibrium state of the power battery is that the battery temperature of the power battery is uniform and equal to the external temperature of the power battery. The external temperature includes an ambient temperature of an environment in which the power battery is located and a coolant temperature of a coolant of an electric vehicle on which the power battery is mounted. Because the battery temperature generated by the battery is different under different charging multiplying factors, the target heat balance temperature of the power battery is determined firstly, namely the external temperature of the power battery is determined, then different preset charging multiplying factors are set after the external temperature is determined, and then the preset charging multiplying factor corresponding to the external temperature is determined according to the battery temperature obtained under different preset charging multiplying factors, so that a heat balance power meter for maintaining the power battery in a heat balance state is formed. Specifically, in one embodiment, as shown in fig. 2, the generating of the heat balance power table includes:
step 201, performing charging simulation on the power battery according to each preset charging rate, and acquiring the temperature of each battery corresponding to each preset charging rate one by one;
step 202, determining that the battery temperature and any target external temperature in the external temperatures are in a thermal balance state, and recording the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power meter.
In an embodiment, a plurality of preset charging magnifications can be preset, and then for a certain preset charging magnification, the power battery is subjected to charging simulation according to the preset charging magnification, so as to obtain the battery temperature corresponding to the preset charging magnification. After the battery temperature corresponding to the preset charging rate is obtained, the battery temperature is matched with a plurality of preset external temperatures, and whether a target external temperature in a thermal balance state with the battery temperature exists in the plurality of external temperatures is determined. If a target external temperature in a thermal balance state with the battery temperature exists in the external temperatures, recording a preset charging rate corresponding to the battery temperature as a second charging rate corresponding to the target external temperature; otherwise, deleting the preset charging rate. Therefore, after the simulation of all the preset charging multiplying powers is completed, the second charging multiplying powers corresponding to the external temperatures one by one can be determined, and the heat balance power meter can be generated according to the mapping relation between the external temperatures and the second charging multiplying powers.
The power battery is charged and simulated through the preset charging multiplying powers, and the second charging multiplying power corresponding to the external temperature is determined from the preset charging multiplying powers based on the matching result of the battery temperature obtained after simulation and the preset external temperature, so that a heat balance power meter is generated, the actually required test amount and resources are greatly saved by virtue of a virtual test of charging performance simulation, and the multiplying power boundary under different external temperatures can be accurately determined.
After the thermal balance power meter is generated, when it is determined that the first charging rate is outside the rate reduction interval, a second charging rate corresponding to the current external temperature is obtained from the thermal balance power meter according to the current external temperature of the power battery, such as the ambient temperature and the temperature of the cooling liquid, so that the generated battery temperature and the current external temperature can be in a thermal balance state when the power battery is charged at the second charging rate.
After the second charging rate is acquired, the first charging rate is compared with the second charging rate. If the first charging multiplying power is smaller than the second charging multiplying power, it indicates that the battery core charging capacity of the current power battery does not cause the battery temperature to be too high to influence the heat balance, and at the moment, the first charging multiplying power is determined as the target multiplying power. If the first charging rate is equal to the second charging rate, it also indicates that the battery core charging capability of the current power battery does not cause the battery temperature to be too high to affect the thermal balance, and at this time, the first charging rate or the second charging rate may be determined as the target rate. If the first charging rate is greater than the second charging rate, it indicates that the battery core charging capacity of the current power battery can cause the battery temperature to be too high and influence the thermal balance, and at the moment, the second charging rate is determined as the target rate, so that the situation that the thermal balance of the power battery is influenced by the too high first charging rate and the power battery is locally overheated is avoided.
Meanwhile, the temperature of the battery is controllable through the mode, so that the charging rate of the power battery cannot be frequently reduced due to overhigh temperature of the battery, and the charging efficiency of the power battery is improved.
In an embodiment, if it is determined that the first charging magnification is within the magnification reduction interval, the first charging magnification may be directly determined as the target magnification. However, in consideration of the characteristics of the charging power table Map _1, when the first charging rate is in the rate reduction section, it tends to be largely different from the historical charging rate at the previous time. That is, the charging power meter Map _1 is usually in a step jump mode, which results in that when the first charging rate is in the rate reduction interval, the charging efficiency of the power battery is significantly reduced if the first charging rate is adopted for charging. In order to improve the charging efficiency, in an embodiment, as shown in fig. 3, the method further includes:
step 103, determining that the first charging rate is in a rate reduction interval, and according to the current battery temperature and the current power data of the power battery, obtaining a corresponding third charging rate from a linear change rate table obtained by performing linear interpolation on the charging power table, so as to determine a larger charging rate between the first charging rate and the third charging rate as the target rate.
In one embodiment, after obtaining the charging power meter, linear interpolation may be applied to the charging power meter in advanceAnd obtaining a linear change multiplying power table in a value mode. In order to make the obtained linear change rate table more accurate, the linear interpolation mode may be obtained by performing linear interpolation on each first charging rate in the rate reduction interval in the charging power table. Specifically, each first charging multiplying power of the charging power meter in a multiplying power reduction interval is used as each different point in the multiplying power reduction interval, then an interpolated function f (x) corresponding to the charging power meter is determined according to each different point, and then an interpolation function of the interpolated function f (x) is determined through linear interpolation
Figure BDA0003882959990000141
Therefore, interpolation nodes corresponding to the battery temperatures and the power data in the magnification reduction interval can be determined, and a linear change magnification table is formed according to the battery temperatures, the power data and the corresponding interpolation nodes.
Illustratively, as shown in fig. 4, assuming that the magnification reduction interval is a magnification reduction interval [0.1c,2c ] of the charging power table Map _1 from the battery temperature of 20 degrees to the power data SOC4 to SOC7]Then, based on each first charging rate in the rate reduction interval, the interpolated function f (x) may be determined in a two-dimensional coordinate system having the abscissa as the electric power data and the ordinate as the first charging rate. Meanwhile, the rate can be decreased according to the multiplying power descending interval [0.1C]To determine an interpolation function
Figure BDA0003882959990000142
At this time, by an interpolation function
Figure BDA0003882959990000143
Third charging rates corresponding to SOC4 to SOC7, respectively, may be determined.
After the third charging rate corresponding to each battery temperature and each electric power data in the rate reduction interval is determined through linear interpolation, a linear change rate table can be generated according to the battery temperature and the electric power data of the power battery and the corresponding third charging rate.
After the linear change rate table is generated, if the first charging rate is determined to be in the rate reduction interval, acquiring a third charging rate corresponding to the current battery temperature and the current power data from the linear change rate table according to the current battery temperature and the current power data of the power battery.
After the third charging magnification is acquired, the first charging magnification and the third charging magnification are compared. If the first charging multiplying power is smaller than the third charging multiplying power, the jump amplitude of the electric core charging capacity of the current power battery is large, the charging efficiency is low, and at the moment, the third charging multiplying power can be determined as the target multiplying power so as to improve the charging efficiency. If the first charging multiplying factor is larger than or equal to the third charging multiplying factor, the jump amplitude of the battery core charging capacity of the current power battery is low, and at the moment, the first charging multiplying factor can be determined as a target multiplying factor.
After the first charging multiplying power is determined to be in the multiplying power reduction interval, the corresponding third charging multiplying power is obtained from the linear change multiplying power table obtained by performing linear interpolation on the charging power table according to the current battery temperature and the current power data of the power battery, so that the larger charging multiplying power between the first charging multiplying power and the third charging multiplying power is determined as the target multiplying power, and therefore the better charging multiplying power can be obtained for charging when the first charging multiplying power is in the multiplying power reduction interval, and the charging efficiency, particularly the charging efficiency of the tail end of the power battery, is improved.
After the target multiplying power is determined, the controller can control the power battery to be charged according to the target multiplying power, so that the temperature of the battery is improved, and the charging efficiency of the power battery is improved.
The following describes a charging control device for a power battery provided by the present application, and the charging control device for a power battery described below and the charging control method for a power battery described above may be referred to in correspondence with each other.
In one embodiment, as shown in fig. 5, there is provided a charging control device for a power battery, including:
a charging multiplying power determining module 210, configured to determine a corresponding first charging multiplying power from a charging power meter according to a current battery temperature and current power data of the power battery;
a target multiplying power determining module 220, configured to determine that the first charging multiplying power is outside a multiplying power reduction interval, and according to a current external temperature of the power battery, obtain a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state, so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and the battery charging control module 230 is used for controlling the power battery to be charged according to the target multiplying power.
The method comprises the steps of determining a first charging rate corresponding to the current battery temperature and the current power data of the power battery from a charging rate table, obtaining a second charging rate corresponding to the current external temperature of the power battery from a thermal balance power meter when the first charging rate is detected to be outside a rate reduction interval, and controlling the power battery to be charged according to a smaller charging rate between the first charging rate and the second charging rate, so that when the power battery has high-rate charging capacity, the temperature of the power battery is limited not to exceed the temperature limit in a thermal balance state through the second charging rate determined by the thermal balance power meter maintaining the power battery in a thermal balance state, the local overheating risk of the battery in the charging process can be reduced, and the charging safety of the power battery is improved.
In an embodiment, the target magnification determination module 220 is specifically configured to:
the first charging multiplying power is not less than the historical charging multiplying power at the previous moment, and the first charging multiplying power is determined to be outside a multiplying power reduction interval;
and determining the historical charging multiplying power from a charging power meter according to the battery temperature of the power battery at the previous moment and the power data at the previous moment.
In an embodiment, the target magnification determination module 220 is further configured to:
performing charging simulation on the power battery according to each preset charging rate, and acquiring the temperature of each battery corresponding to each preset charging rate one by one;
determining that the battery temperature and any target external temperature in the external temperatures are in a thermal balance state, and recording the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power meter.
In an embodiment, the target magnification determination module 220 is further configured to:
and determining that the first charging rate is in a rate reduction interval, and acquiring a corresponding third charging rate from a linear change rate table obtained by performing linear interpolation on the charging power table according to the current battery temperature and the current electric power data of the power battery so as to determine a larger charging rate between the first charging rate and the third charging rate as the target rate.
In an embodiment, the linear change rate table is obtained by performing linear interpolation on each first charging rate in the rate reduction interval in the charging power table.
In one embodiment, the outside temperature includes at least one of an ambient temperature and a coolant temperature of an electric vehicle on which the power electric vehicle is mounted.
In an embodiment, the power data includes at least one of a battery voltage and a battery SOC.
Fig. 6 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 6: a processor (processor) 810, a Communication interface (Communication interface) 820, a memory (memory) 830 and a Communication bus 840, wherein the processor 810, the Communication interface 820 and the memory 830 communicate with each other via the Communication bus 840. The processor 810 may invoke the computer program in the memory 830 to perform a method of controlling the charging of a power battery, including, for example:
determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current power data of the power battery;
determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and controlling the power battery to charge according to the target multiplying power.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present application further provides a storage medium, where the storage medium includes a computer program, where the computer program is stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer is capable of executing the charging control method for a power battery provided in the foregoing embodiments, for example, including:
determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current power data of the power battery;
determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and controlling the power battery to charge according to the target multiplying power.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A charging control method of a power battery is characterized by comprising the following steps:
determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current power data of the power battery;
determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine the smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and controlling the power battery to charge according to the target multiplying power.
2. The power battery charging control method according to claim 1, wherein determining that the first charging rate is outside a rate reduction interval comprises:
the first charging multiplying power is not less than the historical charging multiplying power at the previous moment, and the first charging multiplying power is determined to be outside a multiplying power descending interval;
and determining the historical charging multiplying power from a charging power meter according to the battery temperature of the power battery at the previous moment and the power data at the previous moment.
3. The charging control method of the power battery according to claim 1, characterized by further comprising:
performing charging simulation on the power battery according to each preset charging rate, and acquiring the temperature of each battery corresponding to each preset charging rate one by one;
determining that the battery temperature and any target external temperature in the external temperatures are in a thermal balance state, and recording the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power meter.
4. The charging control method of the power battery according to claim 1, characterized by further comprising:
and determining that the first charging rate is in a rate reduction interval, and acquiring a corresponding third charging rate from a linear change rate table obtained by performing linear interpolation on the charging power table according to the current battery temperature and the current electric power data of the power battery so as to determine the larger charging rate between the first charging rate and the third charging rate as the target rate.
5. The power battery charging control method according to claim 4, wherein the linear change rate table is obtained by performing linear interpolation on each first charging rate in the rate reduction interval in the charging power table.
6. The method according to any one of claims 1 to 5, wherein the outside temperature includes at least one of an ambient temperature and a coolant temperature of an electric vehicle on which the power-driven electric vehicle is mounted.
7. The method according to any one of claims 1 to 5, wherein the electric power data includes at least one of a battery voltage and a battery SOC.
8. A charging control device for a power battery is characterized by comprising:
the charging multiplying power determining module is used for determining a corresponding first charging multiplying power from a charging power meter according to the current battery temperature and the current electric power data of the power battery;
the target multiplying power determining module is used for determining that the first charging multiplying power is outside a multiplying power reduction interval, and acquiring a corresponding second charging multiplying power from a thermal balance power meter for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery so as to determine a smaller charging multiplying power between the first charging multiplying power and the second charging multiplying power as a target multiplying power;
and the battery charging control module is used for controlling the power battery to be charged according to the target multiplying power.
9. An electronic device comprising a processor and a memory storing a computer program, wherein the processor implements the method of controlling charging of a power battery according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing a charging control method for a power battery according to any one of claims 1 to 7.
CN202211234192.3A 2022-10-10 2022-10-10 Charging control method and device for power battery Pending CN115503553A (en)

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