CN113541222B - Charging control method and device - Google Patents
Charging control method and device Download PDFInfo
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- CN113541222B CN113541222B CN202010320307.5A CN202010320307A CN113541222B CN 113541222 B CN113541222 B CN 113541222B CN 202010320307 A CN202010320307 A CN 202010320307A CN 113541222 B CN113541222 B CN 113541222B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- 238000001514 detection method Methods 0.000 claims description 17
- 238000002474 experimental method Methods 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a charging control method and device, and relates to the technical field of charging. The method comprises the following steps: when the ambient temperature is lower than a preset temperature and the power battery is charged, determining a charging demand current for charging the power battery at the current moment; wherein the power battery is connected with the heating element in parallel; determining a compensation current according to the current temperature and the current voltage at the current moment; and determining the actual current for charging the power battery at the current moment according to the charging demand current and the compensation current. The method can adjust the charging output current in real time in the charging process while heating, and solves the problem that the charging power is inaccurate due to the fact that the heating power is in a variable working condition in the charging process in the prior art and the constant current value is adopted as the compensation current of the power battery.
Description
Technical Field
The present invention relates to the field of charging technologies, and in particular, to a charging control method and apparatus.
Background
At present, the discharge capacity of a battery system is lower in a low-temperature environment, meanwhile, the charging power is smaller in the low-temperature environment or the charging is forbidden at an extremely low environment temperature, so that the battery system is required to be heated to a certain temperature and then is allowed to be charged when the battery system is charged in the low-temperature environment, the heating power changes along with the voltage and the temperature of two ends of a heating element in the heating process, particularly when the battery system is charged while being heated, the heating element is connected with the battery system in parallel, the voltage of the two ends is the voltage of the battery system, and therefore, when a bench test is carried out, a part of current set according to the charging and discharging multiplying power of the battery system can be shunted to the heating system, so that the actual charging current of the battery system is not designed current.
In order to ensure the heating effect of the heating system, current compensation needs to be carried out on the heating element, and the current compensation method actually used at present is to measure the constant current value of the heating system after the heating power is constant to compensate, and the heating power is in a variable working condition in the actual charging process, so that the constant current value compensation is adopted to charge the power battery, and the charging power is inaccurate.
Disclosure of Invention
The embodiment of the invention provides a charging control method and a charging control device, which are used for solving the problem that the charging power of a power battery is inaccurate due to the fact that the heating power is in a variable working condition in the actual charging process and a constant current value is adopted as the compensation current of the power battery.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention provides a charging control method, which comprises the following steps:
When the ambient temperature is lower than a preset temperature and the power battery is charged, determining a charging demand current for charging the power battery at the current moment; wherein the power battery is connected with the heating element in parallel;
Determining a compensation current according to the current temperature and the current voltage at the current moment;
and determining the actual current for charging the power battery at the current moment according to the charging demand current and the compensation current.
Further, determining a charging demand current for charging the power battery at the present time includes:
Acquiring a first charging power for charging the power battery;
Acquiring a charging demand current for charging the power battery at the current moment according to the first charging power and a preset battery parameter configuration table; the preset battery parameter configuration table records charging demand current values corresponding to different first charging powers respectively.
Further, determining the compensation current according to the current temperature and the current voltage at the current moment comprises:
Determining a compensation current corresponding to the current temperature and the current voltage according to a preset compensation ammeter;
And the preset compensation ammeter records compensation currents respectively corresponding to different current temperatures and current voltages.
Further, the charging control method further includes:
determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage; and charging the power battery by the actual power.
Further, the charging control method further includes:
executing a charging detection experiment of the power battery;
Acquiring a second charging power, a charging real-time voltage and a real-time temperature of the heating element in the charging detection experiment process;
determining compensation currents at a plurality of moments according to the second charging power;
And obtaining the preset compensation ammeter according to the determined compensation currents, the charging real-time voltage and the real-time temperature at corresponding moments.
Further, obtaining a second charging power on the heating element during the charging detection experiment includes:
Acquiring the specific heat capacity of a battery cell of the power battery, the mass of the battery cell of the power battery and the temperature rise requirement value;
And calculating the product of the specific heat capacity of the battery cell, the mass of the battery cell and the temperature rise required value, and determining the second charging power.
Further, determining the compensation current at a plurality of moments according to the second charging power includes:
And calculating the ratio of the second charging power to the charging real-time voltage at one moment to obtain the compensation current at the corresponding moment.
The present invention also provides a charging control device, including:
The first determining module is used for determining a charging demand current for charging the power battery at the current moment when the ambient temperature is lower than a preset temperature and the power battery is charged; wherein the power battery is connected with the heating element in parallel;
the second determining module is used for determining the compensation current according to the current temperature and the current voltage at the current moment;
and the third determining module is used for determining the actual current for charging the power battery at the current moment according to the charging demand current and the compensation current.
Optionally, the third determining module further includes:
a first control unit for performing a charge detection experiment of the power battery;
The first acquisition unit is used for acquiring second charging power, charging real-time voltage and real-time temperature on the heating element in the charging detection experiment process;
a first determining unit configured to determine compensation currents at a plurality of times according to the second charging power;
And obtaining the preset compensation ammeter according to the determined compensation currents, the charging real-time voltage and the real-time temperature at corresponding moments.
Optionally, the apparatus further includes:
The fourth determining module is used for determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage;
the device controls to charge the power battery with the actual power.
The beneficial effects of the invention are as follows:
When the ambient temperature is lower than the preset temperature, the method of the invention determines the compensation current by obtaining the temperature and the current voltage at the current moment, and determines the actual current for charging the power battery at the current moment by the charging demand current of the power battery and the compensation current, so that the actual current for charging the power battery can be adjusted in real time in the charging and heating process, and meanwhile, the charging power of a battery system cannot be reduced, so that the charging power in the charging process is more accurate.
Drawings
Fig. 1 shows a flow chart of a charging control method according to an embodiment of the present invention;
fig. 2 shows a heating schematic diagram of a charge control method according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a charging control device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided merely to facilitate a thorough understanding of embodiments of the invention. It will therefore be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The invention provides a charging control method and a charging control device aiming at the problem that the charging power is inaccurate due to the fact that the heating power is in a variable working condition in the actual charging process and a constant current value is adopted as a compensation current of a power battery.
As shown in fig. 1, a charging control method provided in an alternative embodiment of the present invention includes:
Step 100, when the ambient temperature is below a preset temperature and the power battery is charged, determining a charging demand current for charging the power battery at the current moment; wherein the power battery is connected with the heating element in parallel;
In this embodiment, by connecting the power battery in parallel with the heating element, the Battery Management System (BMS) determines that the power battery is charged at an ambient temperature below a preset temperature, where the preset temperature is a low temperature lower than a normal temperature (e.g., 20 ℃), determines a charging demand current for charging the power battery at the current time, and the power battery is connected in parallel with the heating element and at the low temperature, and needs to be heated by the heating element to ensure that the current battery power is not affected by the ambient temperature and improve the charging efficiency.
Specifically, the step 100 includes:
Acquiring a first charging power for charging the power battery;
Acquiring a charging demand current for charging the power battery at the current moment according to the first charging power and a preset battery parameter configuration table; the preset battery parameter configuration table records charging demand current values corresponding to different first charging powers respectively.
The battery management system searches a charging requirement current value corresponding to the first charging power at the current moment from a preset battery parameter configuration table according to the first charging power, wherein the preset battery parameter configuration table is a parameter configuration table of the battery when the battery leaves a factory, and charging requirement current values respectively corresponding to different first charging powers are recorded in the preset battery parameter configuration table.
Step 200, determining a compensation current according to the current temperature and the current voltage at the current moment;
specifically, the step 200 includes:
Determining a compensation current corresponding to the current temperature and the current voltage according to a preset compensation ammeter;
And the preset compensation ammeter records compensation currents respectively corresponding to different current temperatures and current voltages.
In this embodiment, the compensation current is a dynamic current value, and according to different ambient temperatures, the compensation current corresponding to the current temperature and the current voltage is determined by presetting a compensation ammeter; the current voltage is the charging real-time voltage of the heating element, the current temperature is the real-time temperature of the heating element, and the current voltage can also be the charging real-time voltage of the power battery because the power battery is connected with the heating element in parallel; and the preset compensation ammeter records compensation currents respectively corresponding to different current temperatures and current voltages.
And 300, determining the actual current for charging the power battery at the current moment according to the charging demand current and the compensation current.
Here, after the charging demand current and the compensation current are obtained, an actual current for charging the power battery at the present time is determined by calculating a sum of both the charging demand current and the compensation current.
Further, the method further comprises:
Step 400, determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage;
and charging the power battery by the actual power.
It should be noted that, according to the heating schematic diagram shown in fig. 2, the power battery is connected in parallel with the heating element, POW is the actual power of the whole power battery, the cell part of the power battery is represented by a module, and the heating element is represented by a heating plate, where the power battery is connected in parallel with the heating element, and the actual power of the power battery charging at the current moment, that is, pow=ut×i1+ut×i2, can be determined by charging real-time voltage (UT) of the module or the heating plate according to the sum of the power battery charging and the current voltage, that is, the charging demand current (I1) and the compensation current (I2); the invention realizes that the heating plate can work according to the actual power by applying dynamic current to the heating plate.
In a specific embodiment, determining the preset compensation ammeter includes:
executing a charging detection experiment of the power battery;
Acquiring a second charging power, a charging real-time voltage and a real-time temperature of the heating element in the charging detection experiment process;
determining compensation currents at a plurality of moments according to the second charging power;
And obtaining the preset compensation ammeter according to the determined compensation currents, the charging real-time voltage and the real-time temperature at corresponding moments.
In this embodiment, on the premise that the power battery is connected in parallel with the heating element, a charging detection experiment of the power battery is performed, and in the process of obtaining the charging detection experiment, a second charging power and a charging real-time voltage on the heating element, wherein the second charging power is the charging power of the heating element, the charging real-time voltage is the real-time voltage of the heating element, and a compensation current at a certain moment can be determined by calculating the ratio of the second charging power to the charging real-time voltage; the second charging power is related to the real-time temperature, so that the real-time temperature at different moments can be obtained, the second charging power at different moments can be obtained, the compensation current at different moments can be obtained, and the preset compensation ammeter is obtained according to the determined compensation currents, the charging real-time voltage at the corresponding moments and the real-time temperature, namely as shown in table 1.
Table 1: compensation ammeter corresponding to different voltages and different temperatures
| V1 | V2 | V3 | V4 | V5 | V6 | |
| T1 | I1-1 | I2-1 | I3-1 | I4-1 | I5-1 | I6-1 |
| T2 | I1-2 | I2-2 | I3-2 | I4-2 | I5-2 | I6-2 |
| T3 | I1-3 | I2-3 | I3-3 | I4-3 | I5-3 | I6-3 |
| T4 | I1-4 | I2-4 | I3-4 | I4-4 | I5-4 | I6-4 |
| T5 | I1-5 | I2-5 | I3-5 | I4-5 | I5-5 | I6-5 |
| T6 | I1-6 | I2-6 | I3-6 | I4-6 | I5-6 | I6-6 |
| T7 | I1-7 | I2-7 | I3-7 | I4-7 | I5-7 | I6-7 |
| T8 | I1-8 | I2-8 | I3-8 | I4-8 | I5-8 | I6-8 |
On the premise that the power battery is connected with the heating element in parallel, the transverse axis in the table 1 is the real-time voltage at two ends of the power battery or the heating element, and the current value range under different voltage values can be determined according to the real-time voltage; the vertical axis in table 1 is the real-time temperature of the heating element, i.e. the range of current values of the heating element at different temperatures, and the compensation current corresponding to the current temperature and the current voltage is determined by obtaining the current temperature and the current voltage of the heating element.
Specifically, obtaining the second charging power on the heating element during the charging detection experiment includes:
Acquiring the specific heat capacity of a battery cell of the power battery, the mass of the battery cell of the power battery and the temperature rise requirement value;
And calculating the product of the specific heat capacity of the battery cell, the mass of the battery cell and the temperature rise required value, and determining the second charging power.
It should be noted that, C represents the specific heat capacity of the battery cell, M represents the mass of the battery cell, Δt represents the temperature rise requirement value, and the second charging power q2=cχ m×Δt is exemplified by the difference between T2 and T1 when the current temperature is T1 in combination with table 1, and the determined second charging power Q2 is the charging power on the heating element at time T2.
Further, determining the compensation current at a plurality of moments according to the second charging power includes:
And calculating the ratio of the second charging power to the charging real-time voltage at one moment to obtain the compensation current at the corresponding moment.
It should be further noted that, when the current temperature is T1, the temperature rise requirement Δt is a difference between T2 and T1, the charging real-time voltage at the current moment is V3, and the compensation current at the current moment is a current value of i2=c×m (T2-T1)/v3=i3-2. And further determining compensation ammeter corresponding to different voltages and different temperatures of the heating element by adjusting the temperature rise requirement value DeltaT in the experimental process.
In summary, the method provided by the invention determines the compensation ammeter corresponding to different voltages and different temperatures of the heating element, can adjust the compensation current of the current temperature at different times in real time according to the compensation ammeter, and determines the actual current for charging the power battery at the current time through the charging demand current of the power battery and the compensation current, thereby avoiding the problem that the charging power is inaccurate due to the fact that the heating power is in a variable working condition in the actual charging process and the constant current value is adopted as the compensation current of the power battery.
As shown in fig. 3, an alternative embodiment of the present invention further provides a charging control device, including:
A first determining module 10, configured to determine a charging demand current for charging the power battery at a current moment when the ambient temperature is less than or equal to a preset temperature; wherein the power battery is connected with the heating element in parallel;
A second determining module 20, configured to determine a compensation current according to the current temperature and the current voltage at the current time;
and a third determining module 30, configured to determine an actual current for charging the power battery at the current moment according to the charging demand current and the compensation current.
Optionally, the third determining module 30 further includes:
a first control unit for performing a charge detection experiment of the power battery;
The first acquisition unit is used for acquiring second charging power, charging real-time voltage and real-time temperature on the heating element in the charging detection experiment process;
a first determining unit configured to determine compensation currents at a plurality of times according to the second charging power;
And obtaining the preset compensation ammeter according to the determined compensation currents, the charging real-time voltage and the real-time temperature at corresponding moments.
Optionally, the first obtaining unit includes:
The first acquisition subunit is used for acquiring the specific heat capacity of the battery cell of the power battery, the mass of the battery cell of the power battery and the temperature rise requirement value;
and the first calculating subunit is used for calculating the product of the specific heat capacity of the battery cell, the mass of the battery cell and the temperature rise requirement value and determining the second charging power.
Optionally, the first determining unit includes:
And the second calculating subunit is used for calculating the ratio of the second charging power to the charging real-time voltage at one moment to obtain the compensation current at the corresponding moment.
Optionally, the first determining module 10 includes:
a second acquisition unit configured to acquire a first charging power for charging the power battery;
The second determining unit is used for obtaining a charging demand current for charging the power battery at the current moment according to the first charging power and a preset battery parameter configuration table; the preset battery parameter configuration table records charging demand current values corresponding to different first charging powers respectively.
Optionally, the second determining module 20 includes:
a third determining unit, configured to determine a compensation current corresponding to the current temperature and the current voltage according to a preset compensation ammeter;
And the preset compensation ammeter records compensation currents respectively corresponding to different current temperatures and current voltages.
Optionally, the apparatus further includes:
The fourth determining module is used for determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage;
the device controls to charge the power battery with the actual power.
In summary, the method and the device provided by the invention have the advantages that the battery system charging power is accurate in the method of acquiring the compensation current in the test; the method and the device provided by the invention have the advantages that the compensation current is adopted for heating power in the heating process, so that the heating efficiency can be improved; in the heating test process while charging, the charging time and the heating time can be accurately estimated, the test accuracy is improved, and the heating energy consumption problem can be accurately estimated according to the data of the compensation current.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present invention, and such modifications and changes are intended to be within the scope of the present invention.
Claims (7)
1. A charging control method, characterized by comprising:
When the ambient temperature is below a preset temperature and the power battery is charged, determining a charging demand current for charging the power battery at the current moment comprises the following steps: acquiring a first charging power for charging the power battery; acquiring a charging demand current for charging the power battery at the current moment according to the first charging power and a preset battery parameter configuration table; the method comprises the steps that charging demand current values corresponding to different first charging powers are recorded in a preset battery parameter configuration table; wherein the power battery is connected with the heating element in parallel;
Determining a compensation current according to the current temperature and the current voltage at the current moment, including: determining a compensation current corresponding to the current temperature and the current voltage according to a preset compensation ammeter; wherein, the preset compensation ammeter records compensation currents respectively corresponding to different current temperatures and current voltages;
determining the actual current for charging the power battery at the current moment according to the charging demand current and the compensation current;
wherein the method further comprises:
Determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage;
and charging the power battery by the actual power.
2. The charge control method according to claim 1, characterized in that the method further comprises:
executing a charging detection experiment of the power battery;
Acquiring a second charging power, a charging real-time voltage and a real-time temperature of the heating element in the charging detection experiment process;
determining compensation currents at a plurality of moments according to the second charging power;
And obtaining the preset compensation ammeter according to the determined compensation currents and the charging real-time voltage and real-time temperature at corresponding moments.
3. The charge control method of claim 2, wherein obtaining the second charge power on the heating element during the charge detection experiment comprises:
Acquiring the specific heat capacity of a battery cell of the power battery, the mass of the battery cell of the power battery and the temperature rise requirement value;
And calculating the product of the specific heat capacity of the battery cell, the mass of the battery cell and the temperature rise required value, and determining the second charging power.
4. The charge control method according to claim 2, characterized in that determining the compensation current at a plurality of timings based on the second charging power includes:
And calculating the ratio of the second charging power to the charging real-time voltage at one moment to obtain the compensation current at the corresponding moment.
5. A charge control device, characterized by comprising:
The first determining module is used for determining a charging demand current for charging the power battery at the current moment when the ambient temperature is lower than a preset temperature and the power battery is charged; wherein the power battery is connected with the heating element in parallel; the first determining module includes: a second acquisition unit configured to acquire a first charging power for charging the power battery; the second determining unit is used for obtaining a charging demand current for charging the power battery at the current moment according to the first charging power and a preset battery parameter configuration table; the method comprises the steps that charging demand current values corresponding to different first charging powers are recorded in a preset battery parameter configuration table;
The second determining module is used for determining the compensation current according to the current temperature and the current voltage at the current moment; the second determining module includes: a third determining unit, configured to determine a compensation current corresponding to the current temperature and the current voltage according to a preset compensation ammeter; wherein, the preset compensation ammeter records compensation currents respectively corresponding to different current temperatures and current voltages;
The third determining module is used for determining the actual current for charging the power battery at the current moment according to the charging demand current and the compensation current;
wherein the apparatus further comprises:
The fourth determining module is used for determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage;
the device controls to charge the power battery with the actual power.
6. The charge control device of claim 5, wherein the third determination module further comprises:
a first control unit for performing a charge detection experiment of the power battery;
The first acquisition unit is used for acquiring second charging power, charging real-time voltage and real-time temperature on the heating element in the charging detection experiment process;
a first determining unit configured to determine compensation currents at a plurality of times according to the second charging power;
and obtaining a preset compensation ammeter according to the determined compensation currents and the charging real-time voltage and real-time temperature at corresponding moments.
7. The charge control device according to claim 5, characterized in that the device further comprises:
The fourth determining module is used for determining the actual power charged by the power battery at the current moment according to the actual current charged by the power battery and the current voltage;
the device controls to charge the power battery with the actual power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102957182A (en) * | 2011-08-23 | 2013-03-06 | 凹凸电子（武汉）有限公司 | Battery charging system and battery discharging system |
| CN104578295A (en) * | 2014-12-31 | 2015-04-29 | 普天新能源车辆技术有限公司 | Vehicle power battery low-temperature charging and heating system and method |
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| US8744592B2 (en) * | 2009-10-08 | 2014-06-03 | Boston Scientific Neuromodulation Corporation | Efficient external charger for an implantable medical device optimized for fast charging and constrained by an implant power dissipation limit |
| CN108859814B (en) * | 2018-05-24 | 2020-11-20 | 北京新能源汽车股份有限公司 | Charging control method and device for hybrid electric vehicle and vehicle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957182A (en) * | 2011-08-23 | 2013-03-06 | 凹凸电子（武汉）有限公司 | Battery charging system and battery discharging system |
| CN104578295A (en) * | 2014-12-31 | 2015-04-29 | 普天新能源车辆技术有限公司 | Vehicle power battery low-temperature charging and heating system and method |
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