WO2022073451A1 - 一种确定直流充电电流的方法、装置以及一种汽车 - Google Patents
一种确定直流充电电流的方法、装置以及一种汽车 Download PDFInfo
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- WO2022073451A1 WO2022073451A1 PCT/CN2021/121679 CN2021121679W WO2022073451A1 WO 2022073451 A1 WO2022073451 A1 WO 2022073451A1 CN 2021121679 W CN2021121679 W CN 2021121679W WO 2022073451 A1 WO2022073451 A1 WO 2022073451A1
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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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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- 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
- 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
- H02J7/005—Detection of state of health [SOH]
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/90—Vehicles comprising electric prime movers
- B60Y2200/91—Electric vehicles
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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
-
- 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
Definitions
- the present disclosure relates to the field of automobile control, and in particular, to a method and device for determining a DC charging current, and an automobile.
- the present disclosure provides a method, a device, and an automobile for determining a DC charging current, which minimizes the impact on battery life and performance while meeting the fast charging charging current requirement.
- a first aspect of the embodiments of the present disclosure provides a method for determining a DC charging current, the method comprising:
- the DC charging current is sent to the charging pile.
- the method before determining the first charging current according to the battery temperature, the method further includes:
- the first charging current is changed to the fifth charging current current; when the lowest temperature of the battery during charging is reduced to not higher than the corresponding second preset current value, changing the first charging current to a sixth charging current;
- the first charging current is changed to the seventh charging current current; when the maximum temperature of the battery during charging is reduced to not higher than the corresponding fourth preset current value, the first charging current is changed to the eighth charging current.
- the method before determining the second charging current according to the cell voltage of the battery, the method further includes:
- the second charging current is changed to the ninth charging current
- the second charging current is changed to the tenth charging current.
- compare the magnitudes of the first charging current and the second charging current take a smaller value and make corrections to form a third charging current, including:
- the difference between the value of the first charging current and the calibration value forms the third charging current
- the difference between the value of the second charging current and the calibration value forms the third charging current.
- the first charging current is changed to the eleventh charging current; if the lowest temperature of the battery is low changing the first charging current to zero at a corresponding fifth preset current value;
- the first charging current is changed to the twelfth charging current; if the lowest temperature of the battery is not higher than the corresponding When the seventh preset current value is , the first charging current is changed to the thirteenth charging current;
- the first charging current is changed to the fourteenth charging current; if the maximum temperature of the battery is higher than the corresponding At the eighth preset current value, the first charging current is changed to zero.
- the second charging current is changed to zero.
- a second aspect of the embodiments of the present disclosure provides an apparatus for determining a DC charging current, the apparatus comprising:
- a first determining module configured to determine the first charging current according to the battery temperature
- a second determining module configured to determine the second charging current according to the cell voltage of the battery
- a comparison and correction module configured to compare the magnitudes of the first charging current and the second charging current, take a smaller value and make corrections to form a third charging current
- the meter lookup module is used to obtain the fourth charging current by looking up the highest temperature and the highest elevator voltmeter according to the battery temperature;
- a determining charging current module is used for comparing the magnitudes of the third charging current and the fourth charging current, taking the smaller value and summing it with the consumption current of the high-voltage accessory to obtain the DC charging current required for battery charging.
- the device further includes:
- the temperature interval setting module is used to set multiple temperature intervals according to the initial temperature of the battery
- the temperature interval setting current module is used to respectively set the corresponding first charging current for each temperature interval
- the first charging current is changed to the fifth charging current current; when the lowest temperature of the battery during charging is reduced to not higher than the corresponding second preset current value, changing the first charging current to a sixth charging current;
- the first charging current is changed to the seventh charging current current; when the maximum temperature of the battery during charging is reduced to not higher than the corresponding fourth preset current value, the first charging current is changed to the eighth charging current.
- the device further includes:
- the voltage interval setting module is used to set multiple voltage intervals according to the highest cell voltage of the battery
- the voltage interval setting current module is used to respectively set the corresponding second charging current for each voltage interval
- the second charging current is changed to the ninth charging current
- the second charging current is changed to the tenth charging current.
- the comparison and correction module includes:
- a correction unit configured to form the third charging current by making a difference between the value of the first charging current and a calibration value if the value of the first charging current is small;
- the temperature interval setting module is further configured to set an initial temperature interval, a special temperature interval and an end temperature interval according to the initial temperature of the battery;
- the temperature interval setting current module is further configured to respectively set corresponding first charging currents for the starting temperature interval, the special temperature interval and the ending temperature interval;
- the first charging current is changed to the eleventh charging current; if the lowest temperature of the battery is low changing the first charging current to zero at a corresponding fifth preset current value;
- the first charging current is changed to the twelfth charging current; if the lowest temperature of the battery is not higher than the corresponding When the seventh preset current value is , the first charging current is changed to the thirteenth charging current;
- the first charging current is changed to the fourteenth charging current; if the maximum temperature of the battery is higher than the corresponding At the eighth preset current value, the first charging current is changed to zero.
- the voltage interval setting current module is further configured to change the second charging current to zero when the highest cell voltage of the battery is not lower than a preset voltage threshold.
- a third aspect of the embodiments of the present disclosure provides an automobile, where the automobile includes: a vehicle controller;
- the vehicle controller executes the method for determining the DC charging current as described above.
- the first charging current is determined according to the battery temperature
- the second charging current is determined according to the cell voltage of the battery
- the magnitudes of the first charging current and the second charging current are compared, and the smaller value is taken.
- the third charging current integrates the factors of battery temperature and cell voltage, and takes the smaller value of the two to ensure that on the basis of the size of the charging current, it will not exceed the battery temperature and cell voltage. The upper limit value of the charging current under the factor.
- the third charging current On the basis of the third charging current, check the highest temperature and the highest elevator voltmeter according to the battery temperature to obtain the fourth charging current, then compare the magnitudes of the third charging current and the fourth charging current, take the smaller value and consume it with the high-voltage accessories The current is summed to obtain the DC charging current required for battery charging, and finally the DC charging current is sent to the charging pile.
- the third charging current Since the third charging current has integrated the factors of battery temperature and cell voltage, it will not exceed the upper limit value of the charging current under the factors of battery temperature and cell voltage, so it is compared with the fourth charging current to be smaller, and further accurate fast charging The value of the charging current will not exceed the upper limit of the charging current under the factors of battery temperature and cell voltage while meeting the demand of fast charging charging current, and the charging current will no longer change linearly, but will be a constant charging current. Minimal impact on battery life and performance, with high utility value.
- FIG. 1 is a flowchart of a method for determining a DC charging current according to an embodiment of the present disclosure
- FIG. 2 is an example diagram of specific temperature interval and charging current value setting in an embodiment of the present disclosure
- FIG. 3 is an example diagram of specific voltage interval and charging current value setting in an embodiment of the present disclosure
- FIG. 4 is a block diagram of an apparatus for determining a DC charging current according to an embodiment of the present disclosure
- Figure 5 schematically shows a block diagram of a computing processing device for performing methods according to the present disclosure.
- Figure 6 schematically shows a memory unit for holding or carrying program code implementing the method according to the present disclosure.
- the large charging current may exceed the upper limit of the allowable charging current under the current temperature factor of the battery, and may also exceed the upper limit of the allowable charging current under the current cell voltage factor of the battery, and the linear change of the charging current is not stable, it will present a current value. Bigger and smaller repeating changes, not continuously getting bigger or smaller.
- FIG. 1 shows a flowchart of a method for determining a DC charging current according to an embodiment of the present disclosure. The method includes:
- Step 101 Determine the first charging current according to the battery temperature.
- the first charging current is first determined according to the battery temperature.
- the so-called first charging current is the upper limit value of the allowable charging current based on the current temperature of the battery.
- the inventor creatively proposes the following idea:
- a plurality of temperature ranges are set, and then a corresponding first charging current is set for each temperature range respectively. That is, according to the current temperature when the battery is about to be charged, multiple temperature ranges are set.
- temperature is a key and sensitive factor. In general, it is based on the working efficiency, life, performance and other factors of the battery. , Electric vehicles will have air conditioners and other equipment to heat and dissipate the battery to maintain the temperature of the battery. However, in practice, due to factors such as ambient temperature and working state, the battery temperature will inevitably have various sizes.
- Step 102 Determine the second charging current according to the cell voltage of the battery.
- the second charging current similarly, before the electric vehicle is charged, that is, before the electric vehicle is connected to the DC charging pile, the second charging current also needs to be determined according to the cell voltage of the battery.
- the so-called second charging current is the upper limit of the allowable charging current based on the current cell voltage of the battery.
- the inventor creatively proposes the following idea:
- the highest cell voltage of the battery multiple temperature ranges are set, and then a corresponding second charging current is set for each temperature range. That is, a plurality of temperature zones are set according to the current highest cell voltage when the battery is about to be charged. Due to the particularity of the battery, the highest cell voltage is also a key and sensitive factor.
- electric vehicles use battery modules, and the battery module includes multiple cells, based on the working efficiency, life, and performance of the battery. As well as various factors such as the manufacturing process, the cell voltage of each battery may be slightly different. However, in practice, due to factors such as manufacturing process and working state, with the increase of use time, the cell voltage of each battery will inevitably change, and the difference in voltage value between them may increase, and the battery is fully charged.
- the voltage during charging is generally the upper limit of the allowable voltage, and the battery voltage will naturally drop after a period of use. Similarly, the battery voltage will be relatively low before charging, and the battery voltage will gradually increase as the charging progresses. And the cell voltage value of each battery is different. Therefore, it is necessary to set multiple temperature ranges according to the current highest cell voltage of the battery, and for each temperature range and considering factors such as the voltage increase during the charging process, the inventor has also conducted a more detailed and targeted analysis. Distinguish, the detailed technical solution will be explained below, and will not be repeated here.
- Step 103 Compare the magnitudes of the first charging current and the second charging current, take a smaller value and make corrections to form a third charging current.
- the magnitudes of the first charging current and the second charging current are compared, the smaller value between the two is taken, and correction is made to form a third charging current. recharging current.
- the so-called correction is that after the first charging current and the second charging current take a smaller value, a calibration value is subtracted to further reduce the charging current, and the smaller value after the correction is the third charging current.
- the reason for the correction is that the temperature value of the battery is an estimated value, which is not very accurate. Although the highest cell voltage value is actually measured, there are inevitable errors.
- the charging current value caused by the error may be too high, so a calibration value is proposed, which is a classic value obtained after a large number of calculations, simulations and actual measurements. While the charging current value may be too high, it also meets the demand for fast charging current. Therefore, after comparing the magnitudes of the first charging current and the second charging current, and taking a smaller value, the third charging current is formed after correction is made.
- the value of the first charging current is smaller after the comparison between the first charging current and the second charging current, the difference between the value of the first charging current and the calibration value forms the third charging current; If the value of the second charging current is smaller after the current is compared with the second charging current, the difference between the value of the second charging current and the calibration value forms the third charging current.
- Step 104 Check the maximum temperature and the maximum elevator voltmeter according to the battery temperature to obtain the fourth charging current.
- the fourth charging current needs to be obtained by checking the highest temperature and the highest elevator voltmeter according to the current temperature of the battery.
- the table of maximum temperature and maximum elevator voltage is a table of charging current corresponding to known battery temperature.
- the charging current obtained based on this table is the upper limit allowed under the current temperature, and it is also a value that changes linearly. Through this table, the upper limit value of the charging current at the current temperature of the battery can be obtained.
- Step 105 Compare the magnitudes of the third charging current and the fourth charging current, take the smaller value and sum it with the consumption current of the high-voltage accessory to obtain the DC charging current required for battery charging.
- the magnitudes of the third charging current and the fourth charging current are compared again, and the smaller value between the two is taken, and then compared with the consumption of the high-voltage accessory The currents are summed to finally obtain the DC charging current required to charge the battery.
- the third charging current since the third charging current has integrated the factors of the current temperature of the battery and the current highest cell voltage, and will not exceed the upper limit value of the charging current under the factors of the battery temperature and the cell voltage, it is compared with the fourth charging current. When the value is smaller, it further eliminates the problem that all other possible factors cause the determined charging current to be too high, and the fast charging charging current value is accurate.
- the upper limit value of the charging current under the cell voltage factor, and the charging current is a constant charging current, there is no problem exceeding the allowable upper limit of the charging current under the current temperature factor of the battery, nor does it exceed the allowable charging under the current cell voltage factor of the battery.
- the value of the DC charging current needs to be sent to a charging device such as a charging pile before the electric vehicle can start charging.
- the charging current can be automatically re-determined according to the technical solutions of steps 101 to 105 above. It is understandable that during the charging process, the temperature and cell voltage of the battery change slowly and cannot be abruptly changed. Therefore, as long as the current temperature of the battery and the current highest cell voltage are still within the current range, the charging current will basically not change.
- the so-called starting temperature range means that the battery is allowed to be charged after the current minimum temperature of the battery is higher than a certain temperature value, and the battery is not allowed to be charged when the temperature is lower than this value. This is to protect the battery. For example, it is currently known that if the initial minimum temperature of the battery is lower than -20°C, it cannot be charged, otherwise the battery life and performance will be seriously affected. Therefore, it is necessary to set the starting temperature range.
- the so-called special temperature range means that when the battery is in this temperature range, when the temperature increases, it needs to consider that the maximum temperature of the battery is not lower than a value to change the charging current, and when the temperature decreases, it needs to consider that the minimum temperature of the battery is not higher than a value. value when changing the charge current. For example: it is currently known that 15°C is a special value. When the maximum temperature of the battery is not lower than 15°C, the charging current needs to be considered according to the maximum temperature of the battery. The temperature takes into account the charging current. This value is also the preset temperature threshold.
- the so-called termination temperature range means that after the current maximum temperature of the battery is higher than a certain temperature value, the battery is not allowed to be charged, and the battery is allowed to be charged only when the current maximum temperature is not higher than this value, which is also to protect the battery. For example, it is currently known that if the initial maximum temperature of the battery is higher than 55°C, it cannot be charged, otherwise the battery life and performance will be seriously affected. Therefore, it is necessary to set the end temperature range.
- the so-called normal temperature range refers to other temperature ranges other than the above-mentioned starting temperature range, special temperature range, and ending temperature range.
- the battery temperature may rise during charging.
- the first charging current is changed to the first charging current.
- Five charging currents; and the battery temperature may also decrease during charging.
- the lowest temperature of the battery is decreased to not higher than the corresponding second preset current value, the first charging current is changed to the sixth charging current.
- the battery temperature may rise during charging, and when its maximum temperature rises to no lower than the corresponding third preset current value, change the first charging current to the third Seven charging currents; the battery temperature may also decrease during charging, and when its maximum temperature decreases to no higher than the corresponding fourth preset current value, the first charging current is changed to the eighth charging current.
- the first charging current is changed to the eleventh charging current; if the lowest temperature of the battery is lower When the corresponding fifth preset current value is used, the first charging current is changed to zero; for a special temperature range, if the maximum temperature of the battery is not lower than the corresponding sixth preset current value, the first charging current is changed.
- the twelfth charging current is the twelfth charging current; if the lowest temperature of the battery is not higher than the corresponding seventh preset current value, change the first charging current to the thirteenth charging current; for the termination temperature range, if the highest temperature of the battery is not higher than When it is higher than the corresponding eighth preset current value, change the first charging current to the fourteenth charging current; if the maximum temperature of the battery is higher than the corresponding eighth preset current value, change the first charging current to zero .
- FIG. 2 is an exemplary diagram of setting specific temperature intervals and charging current values in an embodiment of the present disclosure.
- SOH is the abbreviation of state of heath, Chinese: state of health.
- the temperature range where the initial minimum temperature of the battery is lower than -20°C is the initial temperature range
- the temperature range where the initial battery temperature is [5°C, 14°C] is a special temperature range
- the initial maximum temperature of the battery is equal to 55°C.
- the temperature range of °C and above is the termination temperature range, and the rest are the normal temperature range.
- the heating function may also be used to heat the battery to increase the temperature of the battery, so that the battery can be charged in a better state.
- the cell voltage of the battery due to the characteristics of the battery, the cell voltage of the battery will increase with the charging, so according to the highest cell voltage of the battery, set multiple voltage intervals; set the corresponding voltage interval for each voltage interval the second charging current;
- the second charging current is changed to the ninth charging current; and the highest cell voltage of the battery is not lower than the corresponding
- the second charging current is changed to the tenth charging current.
- the second charging current is changed to zero when the highest cell voltage of the battery is not lower than the preset voltage threshold.
- the preset voltage threshold of the battery is 4.2V, then when the highest cell voltage of the battery reaches 4.2V, the battery cannot be recharged.
- the highest cell voltage of the battery 7 voltage intervals are set: the voltage interval in which the highest cell voltage is lower than V1 (Maximum cell voltage ⁇ V1 in Figure 3), and the voltage interval in which the highest cell voltage is not lower than V1 and lower than V2 (V1 ⁇ Maximum cell voltage ⁇ V2 in Fig. 3), the highest cell voltage is not lower than V2 and lower than V3 voltage range (V2 ⁇ Maximum cell voltage ⁇ V3 in Fig.
- the highest cell voltage is not lower than V3 and Voltage range below V4 (V3 ⁇ Maximum cell voltage ⁇ V4 in Figure 3), the highest cell voltage is not lower than V4 and lower than V5 (V4 ⁇ Maximum cell voltage ⁇ V5 in Figure 3), the highest cell voltage
- the voltage range is not lower than V5 and lower than V6 (V5 ⁇ Maximum cell voltage ⁇ V6 in Figure 3), and the voltage range where the highest cell voltage is not lower than 4.2V (Maximum cell voltage ⁇ 4.2 in Figure 3).
- V1, V2, V3, V4, V5, V6 are shown in the following table:
- the charging current based on this voltage range is set to 15.6A (15.6A*SOH in Figure 3); when the battery When the current highest cell voltage of the battery is not lower than V1 and lower than the voltage range of V2 (V1 ⁇ Maximum cell voltage ⁇ V2 in Figure 3), or the current highest cell voltage of the battery rises to not low as the charging progresses
- the charging current based on this voltage range is changed to 156A (156A*SOH in Figure 3); when the current highest cell voltage of the battery When the voltage is not lower than V2 and lower than the voltage range of V3 (V2 ⁇ Maximum cell voltage ⁇ V3 in Figure 3), or the current highest cell voltage of the battery increases to not lower than V2 and lower than When the voltage range is V3 (V2 ⁇ Maximum cell voltage ⁇ V3 in Figure 3).
- the charging current based on this voltage range is changed to 78A (78A*SOH in Figure 3); when the current highest battery voltage When the cell voltage is not lower than V4 and lower than the voltage range of V5 (V4 ⁇ Maximum cell voltage ⁇ V5 in Figure 3), or the current highest cell voltage of the battery increases to not lower than V4 and When the voltage range is lower than V5 (V4 ⁇ Maximum cell voltage ⁇ V5 in Figure 3), the charging current based on this voltage range is changed to 51.5A (51.5A*SOH in Figure 3).
- the set charging current should be 156A*SOH; but according to the highest cell voltage of 3.98V, which is in the voltage range of not less than 3.875V and less than 4.13V, the set charging current should be is 109.2A*SOH. Then compare the size of the two charging currents and take the smaller value. The charging current should be 109.2A*SOH, and then correct it.
- the corrected charging current is 108A*SOH, and then according to the battery
- the temperature is 26°C
- check the highest temperature and the highest elevator voltmeter, and the corresponding charging current is 156A*SOH. Compare the two and take the smaller value.
- the charging current is 108A*SOH, and then sum it with the consumption current of the high-voltage accessories.
- the current consumption of the high-voltage accessory is 10A*SOH, then the final DC charging current required for battery charging is 118A*SOH, and this value can be sent to the charging pile.
- the corresponding charging current is 51A*SOH, and then the corresponding charging current is determined according to the highest cell voltage at that time, and the above steps are repeated again to obtain a new battery charge.
- the required DC charging current can be sent to the charging pile.
- An embodiment of the present disclosure further provides an apparatus for determining a DC charging current.
- FIG. 4 a block diagram of an apparatus for determining a DC charging current is shown in an embodiment of the present disclosure, and the apparatus includes:
- a first determining module 410 configured to determine the first charging current according to the battery temperature
- the second determination module 420 is configured to determine the second charging current according to the cell voltage of the battery
- a comparison and correction module 430 configured to compare the magnitudes of the first charging current and the second charging current, take a smaller value and make corrections to form a third charging current
- the table lookup module 440 is used to obtain the fourth charging current by checking the maximum temperature and the maximum elevator voltmeter according to the battery temperature;
- the determining charging current module 450 is used for comparing the magnitudes of the third charging current and the fourth charging current, taking the smaller value and summing it with the consumption current of the high-voltage accessory to obtain the DC charging current required for battery charging.
- the device further includes:
- the temperature interval setting module is used to set multiple temperature intervals according to the initial temperature of the battery
- the temperature interval setting current module is used to respectively set the corresponding first charging current for each temperature interval
- the first charging current is changed to the fifth charging current current; when the lowest temperature of the battery during charging is reduced to not higher than the corresponding second preset current value, changing the first charging current to a sixth charging current;
- the first charging current is changed to the seventh charging current current; when the maximum temperature of the battery during charging is reduced to not higher than the corresponding fourth preset current value, the first charging current is changed to the eighth charging current.
- the device further includes:
- the voltage interval setting module is used to set multiple voltage intervals according to the highest cell voltage of the battery
- the voltage interval setting current module is used to respectively set the corresponding second charging current for each voltage interval
- the second charging current is changed to the ninth charging current
- the second charging current is changed to the tenth charging current.
- the comparison and correction module 430 includes:
- a correction unit configured to form the third charging current by making a difference between the value of the first charging current and a calibration value if the value of the first charging current is small;
- the temperature interval setting module is further configured to set an initial temperature interval, a special temperature interval and an end temperature interval according to the initial temperature of the battery;
- the temperature interval setting current module is further configured to respectively set corresponding first charging currents for the starting temperature interval, the special temperature interval and the ending temperature interval;
- the first charging current is changed to the eleventh charging current; if the lowest temperature of the battery is low changing the first charging current to zero at a corresponding fifth preset current value;
- the first charging current is changed to the twelfth charging current; if the lowest temperature of the battery is not higher than the corresponding When the seventh preset current value is , the first charging current is changed to the thirteenth charging current;
- the first charging current is changed to the fourteenth charging current; if the maximum temperature of the battery is higher than the corresponding At the eighth preset current value, the first charging current is changed to zero.
- the voltage interval setting current module is further configured to change the second charging current to zero when the highest cell voltage of the battery is not lower than a preset voltage threshold.
- An embodiment of the present disclosure further provides an automobile, where the automobile includes: a vehicle controller; the vehicle controller executes the method for determining a DC charging current described in any one of the above steps 101 to 105 .
- the method for determining the DC charging current of the embodiments of the present disclosure comprehensively considers the factors of the battery temperature and the cell voltage, so that the upper limit value of the charging current under the factors of the battery temperature and the cell voltage will not be exceeded.
- the charging current obtained from the table is taken to be smaller after comparison, and the further accurate charging current value of fast charging will not exceed the upper limit value of charging current under the factors of battery temperature and cell voltage while satisfying the charging current demand of fast charging, and charging
- the current is a constant charging current, there is no problem of exceeding the upper limit of the charging current allowed under the current temperature factor of the battery, and there is no problem exceeding the upper limit of the charging current allowed under the current cell voltage factor of the battery, let alone the current of the charging current.
- the problem of repeated changes in the value of larger and smaller values minimizes the impact of current fast charging on battery life and performance, and has high practical value.
- the device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.
- Various component embodiments of the present disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof.
- a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in a computing processing device according to embodiments of the present disclosure.
- DSP digital signal processor
- the present disclosure can also be implemented as apparatus or apparatus programs (eg, computer programs and computer program products) for performing some or all of the methods described herein.
- Such a program implementing the present disclosure may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.
- Figure 5 illustrates a computing processing device that may implement methods in accordance with the present disclosure.
- the computing processing device traditionally includes a processor 1010 and a computer program product or computer readable medium in the form of a memory 1020 .
- the memory 1020 may be electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM.
- the memory 1020 has storage space 1030 for program code 1031 for performing any of the method steps in the above-described methods.
- the storage space 1030 for program codes may include various program codes 1031 for implementing various steps in the above methods, respectively. These program codes can be read from or written to one or more computer program products.
- These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such computer program products are typically portable or fixed storage units as described with reference to FIG. 6 .
- the storage unit may have storage segments, storage spaces, etc. arranged similarly to the memory 1020 in the computing processing device of FIG. 5 .
- the program code may, for example, be compressed in a suitable form.
- the storage unit includes computer readable code 1031', ie code readable by a processor such as 1010, for example, which, when executed by a computing processing device, causes the computing processing device to perform any of the methods described above. of the various steps.
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Abstract
Description
V 1 | 3.2V |
V2 | 3.875V |
V3 | 4.13V |
V 4 | 4.14V |
V5 | 4.15V |
V6 | 4.16V |
Claims (14)
- 一种确定直流充电电流的方法,其特征在于,所述方法包括:根据电池温度确定第一充电电流;根据电池的单体电压确定第二充电电流;比较所述第一充电电流和所述第二充电电流的大小,取较小值并做修正,形成第三充电电流;根据电池温度查最高温度及最高电梯电压表得到第四充电电流;比较所述第三充电电流和所述第四充电电流的大小,取较小值后与高压附件消耗电流求和,得到电池充电所需的直流充电电流。
- 根据权利要求1所述的方法,其特征在于,在根据电池温度确定第一充电电流之前,还包括:按照电池初始温度,设置多个温度区间;为每个温度区间分别设置相应的第一充电电流;其中,对于低于预设温度阈值的每个温度区间,在充电期间电池的最低温度升高至不低于对应的第一预设电流值时,将所述第一充电电流更改为第五充电电流;在充电期间电池的最低温度降低至不高于对应的第二预设电流值时,将所述第一充电电流更改为第六充电电流;其中,对于高于预设温度阈值的每个温度区间,在充电期间电池的最高温度升高至不低于对应的第三预设电流值时,将所述第一充电电流更改为第七充电电流;在充电期间电池的最高温度降低至不高于对应的第四预设电流值时,将所述第一充电电流更改为第八充电电流。
- 根据权利要求1所述的方法,其特征在于,在根据电池的单体电压确定第二充电电流之前,还包括:按照电池的最高单体电压,设置多个电压区间;为每个电压区间分别设置相应的第二充电电流;其中,在充电期间电池的最高单体电压低于对应的第一预设电压值时,将所述第二充电电流更改为第九充电电流;在充电期间电池的最高单体电压不低于对应的第一预设电压值,且同时低于第二预设电压值时,将所述第二充电电流更改为第十充电电流。
- 根据权利要求1所述的方法,其特征在于,比较所述第一充电电流和 所述第二充电电流的大小,取较小值并做修正,形成第三充电电流,包括:比较所述第一充电电流和所述第二充电电流的大小,取较小值;若所述第一充电电流的值较小,则所述第一充电电流的值与标定值做差形成所述第三充电电流;若所述第二充电电流的值较小,则所述第二充电电流的值与所述标定值做差形成所述第三充电电流。
- 根据权利要求1所述的方法,其特征在于,还包括:按照电池初始温度,设置起始温度区间、特殊温度区间和终止温度区间;为所述起始温度区间、所述特殊温度区间和所述终止温度区间分别设置相应的第一充电电流;其中,在所述起始温度区间内,若电池的最低温度不低于对应的第五预设电流值时,将所述第一充电电流更改为第十一充电电流;若电池的最低温度低于对应的第五预设电流值时,将所述第一充电电流更改为零;在所述特殊温度区间内,若电池的最高温度不低于对应的第六预设电流值时,将所述第一充电电流更改为第十二充电电流;若电池的最低温度不高于对应的第七预设电流值时,将所述第一充电电流更改为第十三充电电流;在所述终止温度区间内,若电池的最高温度不高于对应的第八预设电流值时,将所述第一充电电流更改为第十四充电电流;若电池的最高温度高于对应的第八预设电流值时,将所述第一充电电流更改为零。
- 根据权利要求1所述的方法,其特征在于,还包括:在所述电池的最高单体电压不低于预设电压阈值时,将所述第二充电电流更改为零。
- 一种确定直流充电电流的装置,其特征在于,所述装置包括:第一确定模块,用于根据电池温度确定第一充电电流;第二确定模块,用于根据电池的单体电压确定第二充电电流;比较修正模块,用于比较所述第一充电电流和所述第二充电电流的大小,取较小值并做修正,形成第三充电电流;查表模块,用于根据电池温度查最高温度及最高电梯电压表得到第四充电电流;确定充电电流模块,用于比较所述第三充电电流和所述第四充电电流的 大小,取较小值后与高压附件消耗电流求和,得到电池充电所需的直流充电电流。
- 根据权利要求7所述的装置,其特征在于,所述装置还包括:温度区间设置模块,用于按照电池初始温度,设置多个温度区间;温度区间设置电流模块,用于为每个温度区间分别设置相应的第一充电电流;其中,对于低于预设温度阈值的每个温度区间,在充电期间电池的最低温度升高至不低于对应的第一预设电流值时,将所述第一充电电流更改为第五充电电流;在充电期间电池的最低温度降低至不高于对应的第二预设电流值时,将所述第一充电电流更改为第六充电电流;其中,对于高于预设温度阈值的每个温度区间,在充电期间电池的最高温度升高至不低于对应的第三预设电流值时,将所述第一充电电流更改为第七充电电流;在充电期间电池的最高温度降低至不高于对应的第四预设电流值时,将所述第一充电电流更改为第八充电电流。
- 根据权利要求7所述的装置,其特征在于,所述装置还包括:电压区间设置模块,用于按照电池的最高单体电压,设置多个电压区间;电压区间设置电流模块,用于为每个电压区间分别设置相应的第二充电电流;其中,在充电期间电池的最高单体电压低于对应的第一预设电压值时,将所述第二充电电流更改为第九充电电流;在充电期间电池的最高单体电压不低于对应的第一预设电压值,且同时低于第二预设电压值时,将所述第二充电电流更改为第十充电电流。
- 根据权利要求7所述的装置,其特征在于,所述比较修正模块包括:比较取小单元,用于比较所述第一充电电流和所述第二充电电流的大小,取较小值;修正单元,用于若所述第一充电电流的值较小,则所述第一充电电流的值与标定值做差形成所述第三充电电流;还用于若所述第二充电电流的值较小,则所述第二充电电流的值与所述标定值做差形成所述第三充电电流。
- 一种汽车,其特征在于,所述汽车包括:整车控制器;所述整车控制器执行如权利要求1-6任一所述的确定直流充电电流的方法。
- 一种计算处理设备,其特征在于,包括:存储器,其中存储有计算机可读代码;以及一个或多个处理器,当所述计算机可读代码被所述一个或多个处理器执行时,所述计算处理设备执行如权利要求1-6任一所述的确定直流充电电流的方法。
- 一种计算机程序,包括计算机可读代码,当所述计算机可读代码在计算处理设备上运行时,导致所述计算处理设备执行根据权利要求1-6任一所述的确定直流充电电流的方法。
- 一种计算机可读介质,其中存储了如权利要求13所述的计算机程序。
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