CN112865216A - Slow charging energy management system and method for pure electric vehicle - Google Patents
Slow charging energy management system and method for pure electric vehicle Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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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
- H01M10/443—Methods for charging or discharging in response to temperature
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention relates to a pure electric vehicle slow charging energy management system, which comprises: the charging temperature editing module is used for editing a temperature interval for charging the battery; a monitoring module for detecting a temperature of the battery; the judging module is used for judging the size relation between the current temperature value and the temperature interval; the control module adjusts an output object of the vehicle-mounted charging device according to the judgment module result, and controls the vehicle-mounted charging device to charge the battery when the temperature of the battery is within a preset temperature interval; when the battery temperature is not in the preset temperature interval, the control module controls the output power of the vehicle-mounted charging device to be supplied to a temperature regulator used for regulating the temperature, the control module controls the temperature regulator to regulate the battery temperature to the preset temperature interval, and therefore the control module controls the vehicle-mounted charging device to charge the battery. The invention provides an optimal temperature interval for the battery during the charging of the battery, thereby ensuring the charging effect, reasonably optimizing the distribution and use of energy, improving the charging efficiency and saving energy.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a system and a method for managing slow charging energy of a pure electric automobile.
Technical Field
The new energy automobile adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel but adopts a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and forms an automobile with advanced technical principle, new technology and new structure. A pure Electric Vehicle (BEV) is a Vehicle powered by a Vehicle-mounted power supply, and is one of new energy vehicles.
For example, chinese patent document No. CN201710665249.8 discloses a pure electric vehicle charging method and unit, where the method includes, when the pure electric vehicle is in a sleep state, if the VCU of the pure electric vehicle determines that the remaining power of the 12V battery is smaller than a first preset value, determining whether the remaining power of the power battery of the pure electric vehicle is larger than a second preset value, and if so, sending an intelligent charging instruction to the battery management system BMS so that: the BMS controls the main relay to pull in and connect the power storage battery, and the power storage battery charges the 12V storage battery through the DC-DC module.
Pure electric automobile charging methods are generally quick charging methods and slow charging methods, however, large-scale quick charging piles in cities are high in cost and cumbersome to maintain, and the method of slow charging by using an on-board charging device (OBC) is common. However, the slow charging time is long, and the main factors influencing the slow charging efficiency are the charging temperature of the battery, the loss of energy caused by the unreasonable distribution of charging energy and the incomplete charging of the battery.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for managing slow charging energy of a pure electric vehicle, which can provide an optimal temperature range for a battery during battery charging, ensure the charging effect, reasonably optimize energy distribution and use, improve the charging efficiency and save energy.
The technical purpose of the invention is realized by the following technical scheme that the slow charging energy management system of the pure electric vehicle comprises:
the charging temperature editing module is used for editing a temperature interval for charging the battery;
a monitoring module for detecting a temperature of the battery;
the judging module is used for judging the size relation between the current temperature value and the temperature interval;
the control module adjusts an output object of the vehicle-mounted charging device according to the judgment module result, and controls the vehicle-mounted charging device to charge the battery when the temperature of the battery is within a preset temperature interval; when the battery temperature is not in the preset temperature interval, the control module controls the output power of the vehicle-mounted charging device to be supplied to a temperature regulator used for regulating the temperature, the control module controls the temperature regulator to regulate the battery temperature to the preset temperature interval, and therefore the control module controls the vehicle-mounted charging device to charge the battery.
Therefore, in order to improve the charging efficiency of the pure electric vehicle during slow charging, the invention provides a pure electric vehicle slow charging energy management system which comprises a charging temperature editing module, a monitoring module, a judging module and a control module. The battery enters the highest charging state before or during charging, so that the charging efficiency is improved; the charging temperature editing module is used for editing a temperature interval for charging the battery, and the preset temperature interval is a temperature range in which the battery reaches the highest charging state. The monitoring module is used for detecting the temperature of the battery in real time. The judging module is used for judging the relation between the battery temperature and the temperature interval. The control module adjusts an output object of the vehicle-mounted charging device according to the judgment module result; in order to reduce the energy loss of the rechargeable battery, the energy of the temperature adjusting device is also from the vehicle-mounted charging device. When the temperature of the battery is in the temperature interval, the control module controls the main output power of the vehicle-mounted charging device to be transmitted to the battery for charging. When the temperature of the battery is lower than a preset temperature interval, the control module controls the vehicle-mounted charging device to output power to the temperature adjusting device to heat; when the temperature of the battery is higher than a preset temperature interval, the control module controls the output power of the vehicle-mounted charging device to be cooled by the temperature adjusting device, the temperature of the battery is controlled to be in the preset temperature interval by the temperature adjusting device, and the battery is charged. The output power of the vehicle-mounted charging device is unchanged, and the temperature is adjusted by supplying energy to the vehicle-mounted charging device; compared with the indirect power consumption provided by the battery, the charging efficiency of the battery is improved.
As a preferred aspect of the present invention, the temperature adjusting means is a temperature regulator CLM including a PTC for heating and a compressor EAC for cooling.
Thus, to achieve either an increase or decrease in temperature, the temperature is increased by heating via the PTC5 and decreased by cooling via the compressor EAC.
Preferably, the vehicle-mounted charging device is connected with an energy supply device for supplying energy to a low-voltage load of the whole vehicle.
This improves the charging efficiency of the battery to further reduce the energy consumption of the battery. The energy supply device is connected with the vehicle-mounted charging device, and the vehicle-mounted charging device provides electric energy to the energy supply device through the slow charging pile.
Preferably, the energy supply device is a DC/DC conversion module.
Therefore, the vehicle-mounted charging device is connected with the high-voltage input end of the DC/DC conversion module, and the DC/DC conversion module converts high-voltage electricity into low-voltage electricity to provide energy for the operation of the low-voltage load of the whole vehicle.
The invention also relates to a method for managing slow charging energy of a pure electric vehicle implementing the charging system as defined above, comprising the following steps:
s1, self-defining the charging temperature interval,
setting a temperature interval for charging the battery, wherein the temperature interval enables the battery to reach the highest charging state;
s2, continuously detecting the battery temperature,
continuously detecting the current temperature of the battery;
s3, a battery temperature judging step,
comparing the temperature value of the battery with the preset temperature interval;
s4, a battery charging step;
adjusting the temperature of the battery according to the judgment result in the step S3 to carry out charging;
when the temperature of the battery is in the preset temperature interval, the vehicle control unit VCU controls the vehicle-mounted charging device to charge the battery;
when the battery temperature is not in the preset temperature interval, two conditions are included:
when the battery temperature is lower than the preset temperature interval
The VCU controls the vehicle-mounted charging device to output power to the temperature adjusting device to heat; after the temperature is increased, the battery is charged when the temperature of the battery is in the preset temperature interval;
when the battery temperature is higher than the preset temperature interval
The VCU controls the vehicle-mounted charging device to output power to the temperature adjusting device for cooling; after the temperature is reduced, the temperature of the battery is preset in the temperature interval, and the battery is charged.
Therefore, in order to improve the charging efficiency of the slow charging of the pure electric vehicle, the invention provides the management method of the slow charging energy of the pure electric vehicle. In order to reach the highest charging state of the battery, firstly setting a temperature interval for charging the battery; and in a preset temperature interval, the charging efficiency of the battery is maximum. Detecting a temperature of the battery; and comparing the currently measured battery temperature value with the preset temperature interval. And when the detected temperature of the battery is in the preset temperature interval, the vehicle-mounted charging device charges the battery. When the detected battery temperature is lower than the preset temperature interval, the PTC requests the whole vehicle controller to input power, so that energy is reasonably distributed, and energy loss is reduced; the output power of the on-vehicle charging device to the temperature regulator CLM is the requested power of the PTC, which heats to raise the temperature. When the detected battery temperature is higher than the preset temperature interval, the compressor EAC requests the whole vehicle controller to input power, the output power of the temperature regulator CLM by the vehicle-mounted charging device is the requested power of the compressor EAC, and the compressor EAC is cooled to reduce the temperature. And controlling the temperature in a preset temperature interval through a temperature rising or reducing process, and charging the battery.
Preferably, in the battery charging process, the vehicle control unit VCU is communicatively connected to a battery management system BMS to obtain a maximum charging value of the battery, and controls the vehicle-mounted charging device to charge the battery.
Therefore, in order to improve the safety of battery charging, the vehicle control unit VCU is in communication connection with the battery management system BMS, the battery management system BMS transmits the maximum charging and discharging current values of the battery to the vehicle control unit VCU, and the vehicle control unit VCU controls the input power of the vehicle-mounted charging device to the battery according to the maximum charging and discharging current values of the battery, so that the charging safety is ensured, and unsafe factors caused by charging unbalance are avoided.
Preferably, when the battery temperature is not within the preset temperature range, the energy flow of the vehicle-mounted charging device includes two stages:
stage one: before the battery is charged, a battery charging temperature interval is obtained,
the input current of the vehicle-mounted charging device to the battery is 0, and the vehicle-mounted charging device provides energy for the DC/DC conversion module (4) and the temperature regulator CLM (5);
and a second stage: in the battery charging process, the charging temperature of the battery is controlled to be within the preset temperature interval,
the vehicle-mounted charging device inputs current to the battery, the input current is not 0, and the vehicle-mounted charging device provides energy for the battery, the temperature regulator CLM (5) and the DC/DC conversion module (4).
Therefore, when the battery temperature is not in the preset temperature interval, the energy flow of the vehicle-mounted charging device comprises the following two stages. Stage one: the battery charging temperature reaches a maximum state of charge before the battery is charged. At this time, the in-vehicle charging device sets the input current to the battery to 0, and does not charge the battery. The vehicle-mounted charging device supplies power to the temperature regulator CLM, and the temperature is regulated through the temperature regulator CLM so that the temperature of the battery reaches the set temperature range; the vehicle-mounted charging device also inputs power to the DC/DC conversion module and operates the low-voltage load of the whole vehicle, so that auxiliary charging is realized. The input power of the vehicle-mounted charging device is unchanged, energy is reasonably distributed, the main energy of the vehicle-mounted charging device is output to the temperature regulator CLM, and when the temperature of the battery reaches the temperature interval, the battery starts to be charged. And a second stage: the vehicle-mounted charging device inputs current different from 0 to the battery. The vehicle-mounted charging device is mainly used for charging the battery, and is used for ensuring that the battery temperature is in the temperature range and the low-voltage load operates when the battery is charged; another part of the energy is used for the operation of the temperature regulator CLM and the DC/DC conversion module.
Preferably, in the first phase, the vehicle control unit VCU controls the output power of the DC/DC conversion module to be a constant value.
Therefore, the input power of the vehicle-mounted charging device is unchanged, and the energy is reasonably distributed in order to maximize the input power of the vehicle-mounted charging device to the battery; and the VCU controls the output power of the DC/DC conversion module to be a fixed value, and the fixed value is only used for maintaining the lowest consumption of the low-voltage load of the whole vehicle.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, the temperature interval for charging the battery is preset, so that the highest charging state of the battery is reached when the battery is charged, and the charging efficiency of the battery is improved;
2. the vehicle-mounted charging device directly supplies energy to the temperature regulator CLM and the DC/DC conversion module, so that the energy consumption of a battery is avoided;
3. the vehicle control unit reasonably distributes energy to the temperature regulator CLM and the DC/DC conversion module, so that the charging energy of the battery is maximized, on one hand, the charging safety is improved, and on the other hand, the input of the maximum charging power of the battery is ensured.
Description of the drawings:
FIG. 1 is a schematic diagram of a system configuration according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps in a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pure electric vehicle system according to a first embodiment of the present invention.
In the figure:
1. the vehicle-mounted charging device OBC, 2, the battery management system BMS, 3, the vehicle control unit VCU, 4, the DC/DC conversion module, 5, the temperature regulator CLM, 51, the PTC, 52 and the compressor EAC.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
In the embodiment 1, in order to improve the charging efficiency of the battery, the charging efficiency is the highest when the battery is charged in a temperature interval by presetting the temperature interval for charging the battery; the temperature controller CLM5 is further powered by the vehicle-mounted charging device, and the temperature range is realized.
In order to achieve the above object, as shown in fig. 1, the present embodiment provides a system for managing slow charging energy of a pure electric vehicle, where the system includes a charging temperature editing module, a monitoring module, a determining module, and a control module. The battery enters the highest charging state before or during charging, so that the charging efficiency is improved; the charging temperature editing module is used for editing a temperature interval of charging the battery, wherein the temperature interval is a temperature range of the battery reaching the highest charging state. The monitoring module is used for detecting the temperature of the battery in real time. The judging module is used for judging the relationship between the temperature of the battery and the size of the temperature interval. The control module adjusts an output object of the vehicle-mounted charging device according to the result of the judging module. When the temperature of the battery is lower than a preset temperature interval, the control module controls the vehicle-mounted charging device to output power to the PTC51 for heating; when the temperature of the battery is higher than a preset temperature range, the control module controls the vehicle-mounted charging device to output power to the compressor EAC52 for cooling; when the temperature of the battery is in the temperature interval, the control module controls the output power of the vehicle-mounted charging device to be transmitted to the battery for charging. The output power of the vehicle-mounted charging device is unchanged, and the temperature is regulated by supplying energy to the vehicle-mounted charging device; compared with the indirect power consumption provided by the battery, the charging efficiency of the battery is improved.
According to the charging system defined above, a method for managing slow charging energy of a pure electric vehicle is provided, and as shown in fig. 2, a flow chart of the method is provided, which includes the following steps:
setting a temperature interval of the rechargeable battery, wherein the charging efficiency of the battery is the maximum in the temperature interval;
continuously detecting the current temperature of the battery;
comparing the current temperature of the battery with a preset temperature interval;
when the detected battery temperature is lower than a preset temperature interval, the PTC51 requests the vehicle controller 3 to input power, the vehicle controller 3 controls the vehicle-mounted charging device to output power to the PTC51, and the PTC51 heats to raise the temperature;
when the detected temperature of the battery is higher than the preset temperature interval, the EAC52 requests the vehicle control unit 3 to input power, the vehicle control unit 3 controls the vehicle-mounted charging device to output power to the EAC52, and the compressor EAC52 cools to reduce the temperature.
When the temperature of the battery reaches a preset temperature interval, the vehicle control unit 3 controls the vehicle-mounted charging device to charge the battery.
In this embodiment, in order to enter the highest charging state when the battery is charged, the temperature of the battery is always kept within a preset temperature range when the battery is charged. When the battery temperature is not in the preset temperature interval, two conditions exist, wherein the first condition is that the battery temperature is not in the preset temperature interval before the battery is charged; the second condition is that the battery temperature is not in the preset temperature range when the battery is charged. According to the two situations, in order to improve the charging efficiency of the battery, the energy flow of the vehicle-mounted rechargeable battery is divided into two stages:
stage one: the battery charging temperature reaches a maximum state of charge before charging the battery. At this time, the in-vehicle charging device has an input current of 0 to the battery, and does not charge the battery. The vehicle-mounted charging device supplies power to the temperature regulator CLM, and the temperature is regulated through the temperature regulator CLM so that the temperature of the battery reaches a set temperature interval; the vehicle-mounted charging device also inputs power to the DC/DC conversion module to operate the low-voltage load of the whole vehicle, so that auxiliary charging is realized. The input power of the vehicle-mounted charging device is unchanged, the vehicle-mounted charging device outputs the main energy to the temperature regulator CLM for reasonably distributing the energy, and when the temperature of the battery reaches a temperature interval, the battery starts to be charged.
And a second stage: the vehicle-mounted charging device inputs a current different from 0 to the battery. The vehicle-mounted charging device is mainly used for charging the battery, and is used for ensuring that the battery temperature is in a temperature range and the low-voltage load operates when the battery is charged; another part of the energy is used for the operation of the temperature regulator CLM and the DC/DC conversion module.
As shown in fig. 3, the system structure of the pure electric vehicle is schematically illustrated, and includes a vehicle-mounted charging device OBC1, a battery management system BMS2, a vehicle control unit VCU3, a temperature regulator CLM5, and a DC/DC conversion module 4 of a charging auxiliary device. The vehicle control unit VCU3 transmits the temperature regulator CLM5 requested power and the DC/DC conversion module 4 output power to the battery management system BMS 2; the battery management system BMS2 feeds back the maximum charging and discharging power of the battery to the VCU3 of the vehicle control unit. The VCU3 of the vehicle control unit distributes energy according to the maximum charging and discharging power of the battery to ensure the charging safety of the battery and avoid unsafe factors caused by charging unbalance. Firstly, a charging temperature interval of a battery is preset through a VCU3 of the vehicle control unit, the current battery temperature is detected, and the current battery temperature is compared with the preset temperature interval. The object of adjusting the OBC1 output of the on-board charging device includes two conditions before and during charging of the battery, and the two conditions can be divided into four operating conditions as follows:
the first working condition is as follows: if the current battery temperature is detected to be lower than a preset charging temperature range before the battery is charged, the PTC51 sends a request power to the VCU3 of the vehicle control unit, the current output to the battery by the OBC1 of the vehicle-mounted charging device is 0, and power is output to the PTC51 and the DC/DC conversion module 4; the output power is equal to the sum of the DC/DC conversion module 4 output power request and the PTC51 requested power, and the vehicle controller VCU3 allows the available power limit of the thermostat CLM5 to comply with the PTC51 power request.
The second working condition is as follows: if the current battery temperature is detected to be higher than the preset charging temperature interval before the battery is charged, the compressor EAC52 sends a request power to the VCU3 of the vehicle control unit. The current output by the vehicle-mounted charging device OBC1 to the battery is 0, and power is output to the compressor EAC52 and the DC/DC conversion module 4; the output power is equal to the sum of the DC/DC conversion module 4 output power request and the compressor EAC52 requested power, and the vehicle control unit VCU3 allows the available power limit of the thermostat CLM5 to follow the compressor EAC52 power request.
Meanwhile, in order to reduce the power consumption of the low-voltage load of the whole vehicle, under the condition of independent heating or independent cooling, the VCU3 of the whole vehicle controller controls the output power output by the OBC1 of the vehicle-mounted charging device to the DC/DC conversion module 4 to be a fixed value of 800W, and only the minimum power consumption for maintaining the low-voltage load of the whole vehicle is provided.
After heating up the temperature by the PTC51 or cooling down the temperature by the compressor EAC52, the on-board charging device OBC1 charges the battery when it is detected that the current battery temperature is in the preset temperature interval.
The third working condition is as follows: if the battery is charged, when the current temperature value is detected to be lower than the preset charging temperature range, at the moment, the output power of the on-board charging device OBC1 is equal to the sum of the battery request charging power, the PTC51 request power and the output power request of the DC/DC conversion module 4; the vehicle controller VCU3 allows the available power limit of the thermostat CLM5 to comply with the PTC51 power request.
The fourth working condition is as follows: if the battery is charged, when the current temperature value is detected to be higher than the preset charging temperature range, the output power of the on-board charging device OBC1 is equal to the sum of the battery request charging power, the compressor EAC52 request power and the output power request of the DC/DC conversion module 4; the vehicle controller VCU3 allows the available power limit of the thermostat CLM5 to be in accordance with the compressor EAC52 power request.
Meanwhile, in the third and fourth operating conditions, the DC/DC conversion module 4 sends the operating mode, the DC/DC output power, and the DC/DC maximum output power of the DC/DC conversion module 4 to the vehicle control unit VCU 3. The VCU3 feeds back a DC/DC enabling signal and a DC/DC power limiting signal to the DC/DC conversion module 4, and the input power of the OBC1 to the battery is increased by limiting the input power of the OBC1 to the DC/DC conversion module, so that the energy is reasonably distributed, and the charging efficiency of the battery is improved.
Claims (8)
1. The utility model provides a pure electric vehicles slow charging energy management system which characterized in that includes:
the charging temperature editing module is used for editing a temperature interval for charging the battery;
a monitoring module for detecting a temperature of the battery;
the judging module is used for judging the size relation between the battery temperature value and the preset temperature interval;
the control module adjusts an output object of the vehicle-mounted charging device according to the judgment module result, and controls the vehicle-mounted charging device to charge the battery when the temperature of the battery is within a preset temperature interval; when the temperature of the battery is not in the preset temperature range, the control module controls the vehicle-mounted charging device to output power to a temperature regulator for regulating the temperature; the control module controls the temperature regulator to regulate the temperature of the battery to a preset temperature interval, so that the control module controls the vehicle-mounted charging device to charge the battery.
2. The pure electric vehicle slow charging energy management system according to claim 1, characterized in that the temperature regulation device is a temperature regulator CLM (5), and the temperature regulator CLM (5) comprises a PTC (51) for heating and a compressor EAC (52) for cooling.
3. The system according to claim 1, wherein the vehicle-mounted charging device is connected to an energy supply device for supplying energy to low-voltage loads of the entire vehicle.
4. The system for energy management of slow charging of a pure electric vehicle according to claim 3, wherein the energy supply device is a DC/DC conversion module (4).
5. A pure electric vehicle slow charging energy management method implementing the charging system according to any one of claims 1 to 4, characterized by comprising the steps of:
s1, self-defining the charging temperature interval,
setting a temperature interval for charging the battery, wherein the temperature interval enables the battery to reach the highest charging state;
s2, continuously detecting the battery temperature,
continuously detecting the current temperature of the battery;
s3, a battery temperature judging step,
comparing the temperature value of the battery with the preset temperature interval;
s4, a battery charging step,
adjusting the temperature of the battery according to the judgment result in the step S3 to carry out charging;
when the temperature of the battery is in the preset temperature interval, the vehicle control unit VCU (3) controls the vehicle-mounted charging device to charge the battery;
when the battery temperature is not in the preset temperature interval, two conditions are included:
when the battery temperature is lower than the preset temperature interval
The VCU (3) of the vehicle control unit controls the vehicle-mounted charging device to output power to the temperature adjusting device to heat; after the temperature is increased, the battery is charged when the temperature of the battery is in the preset temperature interval;
when the battery temperature is higher than the preset temperature interval
The VCU (3) of the vehicle control unit controls the output power of the vehicle-mounted charging device to cool the temperature adjusting device; after the temperature is reduced, the temperature of the battery is preset in the temperature interval, and the battery is charged.
6. The battery slow charging energy management method of the pure electric vehicle as claimed in claim 5, wherein during the battery charging, the vehicle control unit VCU (3) is communicatively connected to a battery management system BMS (2) to obtain a maximum charging value of the battery, and controls the input power of the vehicle-mounted charging device to the battery.
7. The pure electric vehicle slow charging energy management method according to claim 5, wherein when the battery temperature is not in the preset temperature interval, the energy flow of the vehicle-mounted charging device comprises the following two stages:
stage one: before the battery is charged, a battery charging temperature interval is obtained,
the input current of the vehicle-mounted charging device to the battery is 0, and the vehicle-mounted charging device provides energy for the DC/DC conversion module (4) and the temperature regulator CLM (5);
and a second stage: in the battery charging process, the charging temperature of the battery is controlled to be within the preset temperature interval,
the vehicle-mounted charging device inputs current to the battery, the input current is not 0, and the vehicle-mounted charging device provides energy for the battery, the temperature regulator CLM (5) and the DC/DC conversion module (4).
8. The method for managing slow charging energy of the pure electric vehicle according to claim 7, wherein in the phase one, the vehicle control unit VCU (3) controls the output power of the DC/DC conversion module (4) to be a constant value.
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