CN108749597B - Rapid charging method and device for electric automobile and electric automobile - Google Patents
Rapid charging method and device for electric automobile and electric automobile Download PDFInfo
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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
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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
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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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The embodiment of the invention discloses a quick charging method and device for an electric automobile and the electric automobile. The method comprises the following steps: determining a residual capacity interval based on the current residual capacity of the battery; determining a first charging current value duration and a second charging current value duration corresponding to the remaining capacity interval, wherein the first charging current value is M times of a continuous charging current value of the battery, the second charging current value is N times of the continuous charging current value of the battery, M is greater than 1, and N is less than 1; the product of M and N is greater than 1; and sending a charging command to the charging pile based on a controller local area network communication mode, wherein the charging command comprises a first charging current value, a second charging current value, the duration of the first charging current value and the duration of the second charging current value. The embodiment of the invention can reduce the charging time of the battery.
Description
Technical Field
The embodiment of the invention relates to the technical field of electric automobiles, in particular to a quick charging method and device for an electric automobile and the electric automobile.
Background
The shortage of energy, the petroleum crisis and the environmental pollution are getting more and more severe, which brings great influence to the life of people and is directly related to the sustainable development of national economy and society. New energy technologies are actively developed in all countries of the world. An electric vehicle is considered as an important approach to solve energy crisis and environmental deterioration as a new energy vehicle with reduced oil consumption, low pollution and low noise. The hybrid electric vehicle has the advantages of both a pure electric vehicle and a traditional internal combustion engine vehicle, effectively improves fuel economy and reduces emission on the premise of meeting the requirements of vehicle dynamic property and driving range, and is considered to be one of the effective paths of energy conservation and emission reduction at present.
In the prior art, a constant-current or current-reducing charging mode is mainly adopted at present, and the defect of long charging time is overcome. In the present day that electric vehicles are increasingly popular, long charging time is always the bottleneck of the electric vehicles.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for fast charging an electric vehicle, and an electric vehicle.
The technical scheme of the embodiment of the invention is as follows:
a quick charging method of an electric vehicle includes:
determining a residual capacity interval based on the current residual capacity of the battery;
determining a first charging current value duration and a second charging current value duration corresponding to the remaining capacity interval, wherein the first charging current value is M times of a continuous charging current value of the battery, the second charging current value is N times of the continuous charging current value of the battery, M is greater than 1, and N is less than 1; the product of M and N is greater than 1;
and sending a charging command to a charging pile based on a controller local area network communication mode, wherein the charging command comprises the first charging current value, the second charging current value, the duration of the first charging current value and the duration of the second charging current value.
In one embodiment, the remaining capacity interval is a low remaining capacity interval in which the remaining capacity is less than fifty percent, the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is equal to the second charging current value duration K1 times.
In one embodiment, the remaining capacity interval is a middle remaining capacity interval in which the remaining capacity is equal to or greater than fifty percent and less than eighty percent, wherein the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K2 times the second charging current value duration, and the K2 is less than the K1.
In one embodiment, the remaining capacity interval is a high remaining capacity interval in which the remaining capacity is greater than or equal to eighty percent, and the duration of the first charging current value is less than the duration of the second charging current value.
In one embodiment, the method further comprises:
the charging pile provides pulse type current for the battery, the pulse type current has a first charging current value and a second charging current value, wherein the duration of the first charging current value is the duration of the first charging current value, and the duration of the second charging current value is the duration of the second charging current value.
A quick charging device of an electric vehicle, comprising:
the residual capacity interval determining module is used for determining a residual capacity interval based on the current residual capacity of the battery;
a current value determining module, configured to determine a first charging current value duration and a second charging current value duration corresponding to the remaining power interval, where the first charging current value is M times a continuous charging current value of the battery, and the second charging current value is N times the continuous charging current value of the battery, where M is greater than 1 and N is less than 1; the product of M and N is greater than 1;
and the sending module is used for sending a charging command to the charging pile based on a controller area network communication mode, wherein the charging command comprises the first charging current value, the second charging current value, the duration of the first charging current value and the duration of the second charging current value.
In one embodiment, the remaining capacity interval is a low remaining capacity interval in which the remaining capacity is less than fifty percent, the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is equal to the second charging current value duration K1 times.
In one embodiment, the remaining capacity interval is a middle remaining capacity interval in which the remaining capacity is equal to or greater than fifty percent and less than eighty percent, wherein the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K2 times the second charging current value duration, and the K2 is less than the K1.
In one embodiment, the remaining capacity interval is a high remaining capacity interval in which the remaining capacity is greater than or equal to eighty percent, and the duration of the first charging current value is less than the duration of the second charging current value.
An electric vehicle comprises the quick charging device of the electric vehicle.
According to the technical scheme, in the embodiment of the invention, the residual capacity interval is determined based on the current residual capacity of the battery; determining a first charging current value duration and a second charging current value duration corresponding to the remaining capacity interval, wherein the first charging current value is M times of a continuous charging current value of the battery, the second charging current value is N times of the continuous charging current value of the battery, M is greater than 1, and N is less than 1; the product of M and N is greater than 1; and sending a charging command to the charging pile based on a controller local area network communication mode, wherein the charging command comprises the first charging current value, the second charging current value, the duration time of the first charging current value and the duration time of the second charging current value. Therefore, the embodiment of the invention does not adopt a constant-current or current-reducing charging mode, but adopts two fixed charging current values, and the duration time of the two charging current values is closely related to the current residual capacity. When the remaining amount is small, a large charging current value has a long duration, so that rapid charging is possible, reducing the battery charging time.
In addition, when the residual electric quantity of the battery is large, the small charging current value has a long duration, so that the battery is better protected and the full charge of the battery is ensured.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
Fig. 1 is a flow chart of a quick charging method for an electric vehicle according to the present invention.
FIG. 2 is a pulse diagram of the charging current of the present invention.
Fig. 3 is a schematic diagram of a charging circuit according to the present invention.
Fig. 4 is a structural view of a quick charger for an electric vehicle according to the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
The embodiment of the invention provides a pulse type charging mode which can shorten the time for charging a battery.
Fig. 1 is a flow chart of a quick charging method for an electric vehicle according to the present invention.
As shown in fig. 1, the method includes:
step 101: the remaining capacity section to which the battery belongs is determined based on the current remaining capacity (SOC) of the battery.
For example, in the using process of the power battery, when each charging and discharging can reach the charging and discharging cut-off condition, an accurate battery residual capacity value (for example, 0 or 1) can be obtained, and on the basis, a relatively accurate residual capacity can be obtained through an ampere-hour integration method.
Wherein: the current remaining capacity of the battery is the total capacity-the discharged capacity.
Here, rather than studying the relatively complex electrochemical reactions and the relationships between the parameters within the cell, the cell can be considered as a closed system, focusing only on the external features of the system. In the electric quantity monitoring, the electric quantity of the closed system of the battery is accumulated, and the residual electric quantity of the battery is estimated by accumulating the electric quantity of the battery in the charging or discharging process.
The ampere-hour integration method adopts an integration method to calculate the electric quantity charged into the battery and discharged from the battery in real time, and records and monitors the electric quantity of the battery for a long time, so that the electric quantity can be compared with the full electric quantity at any moment, and the residual electric quantity corresponding to the moment, namely the current residual electric quantity of the battery can be obtained.
Preferably, in the actual use process, considering that the charge-discharge cut-off condition cannot be met every time charge and discharge, and therefore the remaining power cannot be calibrated, a certain error is accumulated every charge and discharge cycle, and the accumulated error reaches an unacceptable step after long-time calibration failure, so that the SOC can be calibrated. For example, in the charging process or the discharging process of the battery, a first residual electric quantity value of the battery is determined by using an ampere-hour integration method; determining a second remaining capacity value of the battery based on the open-circuit voltage of the battery during the charging process or the discharging process; and determining a residual capacity calibration value of the battery based on the first residual capacity value and the second residual capacity value. In one embodiment, the method further comprises: setting a charging standard mark and clearing a discharging standard mark when a charging cut-off condition is reached in the charging process; and/or, when a discharge cutoff condition is reached during discharge, setting a discharge standard flag and clearing a charge standard flag. The charge cutoff condition may include that the battery is fully charged or the cell voltage of the battery reaches a maximum value, and the like.
Similarly, the discharge cutoff conditions include: the battery is completely discharged or the cell voltage of the battery reaches a minimum value, etc. Setting the charging standard flag may specifically be implemented as setting the charging standard flag to 1; the clear discharge criteria flag may be embodied as setting the discharge criteria flag to 0. Setting the discharge standard flag may be specifically implemented to set the discharge standard flag to 1; the clear charge criteria flag may be specifically implemented as setting the charge criteria flag to 0.
The setting manner of the charging standard flag and the discharging standard flag is described above by taking specific numerical values as an example, and those skilled in the art can appreciate that the description is only exemplary and is not used to limit the protection scope of the present invention.
Herein, when the charging standard flag or the discharging standard flag is set, the first residual electric quantity value is determined as the SOC calibration value of the battery; and when the charging standard flag and the discharging standard flag are not set, calculating a weighted average value of the first residual electric quantity value and the second residual electric quantity value, and determining the weighted average value as a residual electric quantity calibration value of the battery.
Then, a remaining capacity interval to which the current remaining capacity belongs is determined based on the current remaining capacity of the battery.
For example, the remaining power interval may be set as follows:
low remaining capacity region: typically at a remaining charge < 50%;
middle remaining power area: the residual electric quantity is in the interval of 50% -80%;
high remaining power region: the residual capacity is in the interval of 80% -100%.
When the residual capacity is lower than fifty percent, the low residual capacity interval is formed; when the residual capacity is more than or equal to fifty percent and less than eighty percent, the battery belongs to the middle residual capacity interval; and when the residual capacity is more than or equal to eighty percent, the high residual capacity interval is included.
The above exemplary description describes a typical example of calculating the current remaining capacity of the battery and dividing the remaining capacity interval, and those skilled in the art will appreciate that this description is only exemplary and is not intended to limit the embodiments of the present invention.
Step 102: determining a first charging current value duration and a second charging current value duration corresponding to the remaining capacity interval, wherein the first charging current value is M times of a continuous charging current value of the battery, the second charging current value is N times of the continuous charging current value of the battery, M is greater than 1, and N is less than 1; the product of M and N is greater than 1.
Wherein the first charging current value may be defined according to a peak charging characteristic of the battery; the second charging current value and the continuous charging current value are defined according to the battery continuous charging characteristic.
Specifically, the continuous charging current value is generally determined by the continuous charging characteristics of the battery. For example, at present, a continuous charging current value of 1C is generally recommended by a cell supplier of an energy type. For example, if the battery has a capacity of 750mAh and the continuous charging current value is 750mA, the continuous charging current value is 1C (i.e., 1 time of the battery capacity), where C is the battery capacity. The applicant found that in the pulse current of the present invention, the first charging current value is preferably twice or three times the continuous charging current value, and the second charging current value is half the continuous charging current value, the charging speed can be increased, and the battery safety can be also ensured.
More preferably, the continuous charging current value is 1C; the interval of the first charging current value is [2C,3C ]; the interval of the second charging current value is (0, 0.5C ].
In one embodiment, the remaining capacity interval is a low remaining capacity interval in which the remaining capacity is less than fifty percent, the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is greater than the second charging current value duration K1 times.
Therefore, the embodiment of the invention does not adopt a constant-current or current-reducing charging mode, but adopts two fixed charging current values, and the duration time of the two charging current values is closely related to the current residual capacity. When the remaining capacity is very small, a large charging current value (first charging current value) has a longer duration than a small charging current value (second charging current value), so that quick charging is possible, reducing the battery charging time.
In one embodiment, the remaining capacity interval is a middle remaining capacity interval in which the remaining capacity is greater than or equal to fifty percent and less than eighty percent, wherein the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K2 times the second charging current value duration, and the K2 is less than the K1.
It can be seen that when the remaining capacity has increased but is still small, the large charging current value still has a longer duration than the small charging current, but the duration of the large charging current value decreases, thereby ensuring safety.
In one embodiment, the remaining capacity interval is a high remaining capacity interval in which the remaining capacity is greater than or equal to eighty percent, wherein the duration of the first charging current value is less than the duration of the second charging current value.
Therefore, when the remaining amount is large, a small charging current value has a longer duration than a large charging current, thereby better protecting the battery.
Step 103: and sending a charging command to the charging pile based on a controller local area network communication mode, wherein the charging command comprises a first charging current value, a second charging current value, the duration of the first charging current value and the duration of the second charging current value.
In one embodiment, the method further comprises:
the charging pile provides pulse type current for the battery, the pulse type current has a first charging current value and a second charging current value, wherein the duration of the first charging current value is the duration of the first charging current value, and the duration of the second charging current value is the duration of the second charging current value. Therefore, the pulse current provided by the charging pile can be used
FIG. 2 is a pulse diagram of the charging current of the present invention; fig. 3 is a schematic diagram of a charging circuit according to the present invention.
Wherein I3 corresponds to the continuous charging current value; i1 corresponds to a first charging current value; i2 corresponds to the second charging current value. I1 is 3 times that of I3; i2 is 0.5 times I3.
The charging process specifically comprises:
firstly, the BMS and the charging pile are successfully communicated; then, the BMS calculates a current remaining capacity of the battery, determines a remaining capacity interval to which the current remaining capacity belongs, determines an I1 duration and an I2 duration corresponding to the remaining capacity interval, and requests the current output from the charging post to pulse-charge the battery according to the I1 duration and the I2 duration. Wherein:
(1) when the current remaining capacity of the battery is in the low SOC region, the duration of I1 is significantly greater than the duration of I2;
(2) when the current remaining capacity of the battery is in the middle SOC region, I1 duration is reduced compared to the low SOC region, but the duration of I1 is still greater than the duration of I2;
(3) and when the current residual capacity of the battery is in a high SOC region, the duration of I1 is less than the duration of I2, so that the battery is fully charged.
Also, the average values of I1 and I2 are greater than I3.
The BMS continuously monitors the current remaining capacity of the battery and continuously decides the I1 duration and the I2 duration based on the above-described procedure.
For example, assuming that the remaining capacity at the time of initial charging of the battery is 3%, which belongs to the low SOC region, the BMS determines the duration of I1 and the duration of I2, and the duration of I1 is significantly greater than the duration of I2 (e.g., the duration of I1 is three times the duration of I2). Then, the BMS sends a first charging command to the charging post, the first charging command including an I1 value, an I2 value, a duration of I1, and a duration of I2; the charging post provides a pulsed current based on the first charging command, the pulsed current having a value of I1 and a value of I2, and a duration of the value of I1 is equal to a duration of the I1, and a duration of the value of I2 is equal to a duration of the I2, wherein a duration of I1 is three times a duration of the I2.
As charging continues, assuming that the remaining battery capacity is 60%, which belongs to the mid-SOC region, the BMS determines the duration of I1 and the duration of I2, and the duration of I1 is greater than the duration of I2 (e.g., the duration of I1 is two times the duration of I2). Then, the BMS sends a second charge command to the charging post, the second charge command including an I1 value, an I2 value, a duration of I1, and a duration of I2; the charging post provides a pulsed current based on the second charging command, the pulsed current having a value of I1 and a value of I2, and a duration of the value of I1 is equal to a duration of the I1, and a duration of the value of I2 is equal to a duration of the I2, wherein a duration of I1 is twice a duration of the I2.
Then, as the charging continues, assuming that the remaining capacity of the battery is 85%, belonging to the high SOC region, the BMS determines the duration of I1 and the duration of I2, and the duration of I1 is smaller than the duration of I2 (e.g., the duration of I1 is one-third of the duration of I2). Then, the BMS sends a third charge command to the charging post, the third charge command including an I1 value, an I2 value, a duration of I1, and a duration of I2; the charging post provides a pulsed current based on the third charging command, the pulsed current having a value of I1 and a value of I2, and a duration of the value of I1 is equal to a duration of the value of I1, and a duration of the value of I2 is equal to a duration of the value of I2, wherein a duration of I1 is one third of a duration of the value of I2.
It can be seen that the optimized charging time t1 is significantly reduced compared with the charging time t2 in the prior art.
Based on the above description, the embodiment of the invention further provides a quick charging device for an electric vehicle.
Fig. 4 is a structural view of a quick charger for an electric vehicle according to the present invention.
As shown in fig. 4, the apparatus includes:
a remaining power interval determination module 401, configured to determine a remaining power interval to which the battery belongs based on a current remaining power of the battery;
a current value determining module 402, configured to determine a first charging current value duration and a second charging current value duration corresponding to a remaining power interval, where the first charging current value is M times a continuous charging current value of a battery, and the second charging current value is N times the continuous charging current value of the battery, where M is greater than 1 and N is less than 1; the product of M and N is greater than 1;
a sending module 403, configured to send a charging command to the charging pile based on a controller area network communication manner, where the charging command includes the first charging current value, the second charging current value, the duration of the first charging current value, and the duration of the second charging current value.
In one embodiment, the remaining capacity interval is a low remaining capacity interval in which the remaining capacity is less than fifty percent, the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is equal to the second charging current value duration K1 times.
In one embodiment, the remaining capacity interval is a middle remaining capacity interval in which the remaining capacity is equal to or greater than fifty percent and less than eighty percent, wherein the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K2 times the second charging current value duration, and the K2 is less than the K1.
In one embodiment, the remaining capacity interval is a high remaining capacity interval in which the remaining capacity is greater than or equal to eighty percent, wherein the duration of the first charging current value is less than the duration of the second charging current value.
The quick charging device according to the embodiment of the present invention may be applied to various types of electric vehicles, such as a pure electric vehicle (BEV), a Hybrid Electric Vehicle (HEV), a Fuel Cell Electric Vehicle (FCEV), and the like.
In summary, in the embodiment of the present invention, the remaining power interval to which the battery belongs is determined based on the current remaining power of the battery; determining a first charging current value duration and a second charging current value duration corresponding to the remaining capacity interval, wherein the first charging current value is M times of a continuous charging current value of the battery, the second charging current value is N times of the continuous charging current value of the battery, M is greater than 1, and N is less than 1; the product of M and N is greater than 1; and sending a charging command to the charging pile based on a controller local area network communication mode, wherein the charging command comprises the first charging current value, the second charging current value, the duration time of the first charging current value and the duration time of the second charging current value. Therefore, the embodiment of the invention does not adopt a constant-current or current-reducing charging mode, but adopts two fixed charging current values, and the duration time of the two charging current values is closely related to the current residual capacity. When the remaining amount is small, a large charging current value has a long duration, so that rapid charging is possible, reducing the battery charging time.
In addition, when the remaining amount of power is large, a small charging current value has a long duration, thereby better protecting the battery.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings are only schematic representations of the parts relevant to the invention, and do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "a" does not mean that the number of the relevant portions of the present invention is limited to "only one", and "a" does not mean that the number of the relevant portions of the present invention "more than one" is excluded. In this document, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications such as combinations, divisions or repetitions of the features without departing from the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A quick charging method of an electric vehicle includes: determining a residual capacity interval based on the current residual capacity of the battery; it is characterized by also comprising:
determining a first charging current value duration and a second charging current value duration corresponding to the remaining capacity interval, wherein the first charging current value is M times of a continuous charging current value of the battery, the second charging current value is N times of the continuous charging current value of the battery, M is greater than 1, and N is less than 1; the product of M and N is greater than 1;
and sending a charging command to a charging pile based on a controller local area network communication mode, wherein the charging command comprises the first charging current value, the second charging current value, the duration of the first charging current value and the duration of the second charging current value.
2. The method according to claim 1, wherein the remaining capacity interval is a low remaining capacity interval in which the remaining capacity is less than fifty percent, the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K1 times the second charging current value duration.
3. The method according to claim 2, wherein the remaining capacity interval is a middle remaining capacity interval in which the remaining capacity is equal to or greater than fifty percent and less than eighty percent, wherein the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K2 times the second charging current value duration, and the K2 is less than the K1.
4. The method according to claim 3, wherein the remaining capacity interval is a high remaining capacity interval in which the remaining capacity is not less than eighty percent, and the duration of the first charging current value is less than the duration of the second charging current value.
5. The method for rapidly charging an electric vehicle according to any one of claims 1 to 4, further comprising:
the charging pile provides pulse type current for the battery, the pulse type current has a first charging current value and a second charging current value, wherein the duration of the first charging current value is the duration of the first charging current value, and the duration of the second charging current value is the duration of the second charging current value.
6. A quick charging device of an electric vehicle, comprising: the residual capacity interval determining module is used for determining a residual capacity interval based on the current residual capacity of the battery; it is characterized by also comprising:
a current value determining module, configured to determine a first charging current value duration and a second charging current value duration corresponding to the remaining power interval, where the first charging current value is M times a continuous charging current value of the battery, and the second charging current value is N times the continuous charging current value of the battery, where M is greater than 1 and N is less than 1; the product of M and N is greater than 1;
and the sending module is used for sending a charging command to the charging pile based on a controller area network communication mode, wherein the charging command comprises the first charging current value, the second charging current value, the duration of the first charging current value and the duration of the second charging current value.
7. The quick charging device of an electric vehicle according to claim 6, wherein the remaining capacity interval is a low remaining capacity interval in which the remaining capacity is less than fifty percent, the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K1 times the second charging current value duration.
8. The quick charging device of an electric vehicle according to claim 7, wherein the remaining capacity interval is a middle remaining capacity interval in which the remaining capacity is equal to or greater than fifty percent and less than eighty percent, wherein the first charging current value duration is greater than the second charging current value duration, and the first charging current value duration is K2 times the second charging current value duration, and the K2 is less than the K1.
9. The quick charging device of an electric vehicle according to claim 8, wherein the remaining capacity interval is a high remaining capacity interval in which the remaining capacity is eighty percent or more, and wherein the first charging current value duration is less than the second charging current value duration.
10. An electric vehicle characterized by comprising the quick charging apparatus for an electric vehicle according to claim 6.
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