CN116080459B - A new energy vehicle battery automatic charging method and system - Google Patents
A new energy vehicle battery automatic charging method and system Download PDFInfo
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- CN116080459B CN116080459B CN202310237644.1A CN202310237644A CN116080459B CN 116080459 B CN116080459 B CN 116080459B CN 202310237644 A CN202310237644 A CN 202310237644A CN 116080459 B CN116080459 B CN 116080459B
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000010287 polarization Effects 0.000 claims description 11
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
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- 230000006978 adaptation Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000003487 electrochemical reaction Methods 0.000 description 1
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Classifications
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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
- 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
-
- 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
-
- 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
- B60L2240/549—Current
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
一种新能源汽车电池自动充电方法，包括步骤S1：STM32CPU主控芯片实时采集参数；步骤S2：充电过程第i段开始前更新荷电状态SOC；步骤S3：当前荷电状态SOC低于Sm时，Sm为充电循环的最小电量，电流取C/10；步骤S4：当前荷电状态SOC处在Sm和St之间时充电电流Ii：步骤S5：若当前SOC大于St，结束充电过程；步骤S6：重复步骤S2至步骤S5，直至充电完成。本发明通过调整过程初始电量Si与设置期望充电结束时的电量的权重，使得电流根据期望达到的电流状态，能够快速实现电池充电降低损耗。
A new energy vehicle battery automatic charging method includes step S1: STM32CPU main control chip real-time parameter collection; step S2: updating the state of charge SOC before the start of the i-th stage of the charging process; step S3: when the current state of charge SOC is lower than Sm, Sm is the minimum power of the charging cycle, and the current is C/10; step S4: when the current state of charge SOC is between Sm and St, the charging current I i : step S5: if the current SOC is greater than St, the charging process ends; step S6: repeating steps S2 to S5 until charging is completed. The present invention adjusts the process initial power Si and sets the weight of the power at the end of the expected charging, so that the current can quickly realize battery charging and reduce losses according to the expected current state.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to an automatic charging method and system for a new energy automobile battery.
Background
At present, with the development of technology, new energy automobiles are increasingly popularized, the application of new energy automobile batteries is also increasingly wide, and lithium ion power batteries have the advantages of high specific energy, long cycle life, low self-discharge multiplying power and the like, and become the main energy of electric automobiles. Since the characteristics of the lithium ion battery are related to the working temperature, when the lithium ion battery is charged and discharged, the battery management system limits the charging and discharging current according to the current temperature and the current capacity so as to ensure that the battery is not damaged. The heat generated in the battery includes reaction heat, joule heat, polarized heat and side reaction heat. For a lithium ion battery, the normal working temperature range of the battery is 20-60 ℃, and the heat generation amount of the lithium ion battery mainly comprises Joule heat and polarized heat. Joule heat and polarized heat are caused by the ohmic internal resistance and the polarized internal resistance of the battery, respectively. The ohmic internal resistance is composed of electrode material, electrolyte, diaphragm resistance and contact resistance of all parts, and the polarized internal resistance refers to resistance caused by polarization in electrochemical reaction, including electrochemical polarization and concentration polarization.
The high-current charge can shorten the charge time, but increase the polarization voltage and increase more energy loss, and the low-current charge can prolong the charge time, but reduce the polarization voltage and make the energy loss in a lower state, so that the battery can keep a stable and healthy state for a long time, and the current needs to be regulated. In the charging and discharging process, the internal resistance and the electric quantity of the battery are different in the changing process, and the loss caused by different internal resistances and charging electric quantity is different, so that how to realize less loss is more studied in the prior art; in addition, the influence of the battery power on the loss in the charging process and the automatic adjustment of the current according to the charging expected value are not considered in the prior art, so that the enhanced automatic adjustment of the reduction of the charging loss and the heat dissipation is an urgent need.
Disclosure of Invention
In order to solve the technical problems, the invention provides the automatic charging method and the system for the new energy automobile battery, which remarkably improve the accuracy of charging and the automatic working level, greatly improve the use efficiency and the convenience of the new energy automobile and enhance the user experience, and the automatic charging method for the new energy automobile battery comprises the following steps:
step S1, an STM32CPU main control chip collects open-circuit voltage and initial electric quantity Si before a battery starts to charge in real time, sets the electric quantity at the end of expected charging as St and the expected charging time T, divides the charging process into N sections, and the charging electric quantity at each stage is equal;
step S2, updating the state of charge SOC before the beginning of the ith section of the charging process;
s3, when the current state of charge SOC is lower than Sm, sm is the minimum electric quantity of a charging cycle, and the current is C/10;
step S4, when the current state of charge SOC is between Sm and St, the ith section current I i in the charging process is as follows:
wherein T CC represents the charging time in a constant current state with a charging period of 25% -95% of SOC, R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, C 0 is the total capacity of the battery, and delta is the self-adaptive coefficient value;
Step S5, if the current SOC is greater than St, ending the charging process;
and S6, repeating the steps S2 to S5 until the charging is completed.
Preferably, the R (SOC) is the total internal resistance of the battery, and is formed by the sum of ohmic resistance and polarization resistance.
Preferably, the STM32CPU main control chip is electrically connected with an intelligent gateway, the intelligent gateway is composed of a main board, a wireless board and an interface board, the main board is composed of an FPGA chip, and the interface board supports four serial interfaces including RS232, RS485, RS422 and an analog sampling interface.
Preferably, the R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, the R (SOC) and R i establish a two-dimensional table based on the SOC, the temperature and the internal resistance through experiments, and the data in the middle of the test points are obtained through two-dimensional linear interpolation.
Preferably, the STM32CPU main control chip further includes collecting charging voltage and current values in real time, automatically adjusting the charging voltage and current values based on a variable domain fuzzy control scheme, stopping the charging process after the charging is completed, and displaying the completion of the charging on a display screen.
The application also provides an automatic charging system of the new energy automobile battery, comprising:
The parameter detection module is used for acquiring open-circuit voltage and initial electric quantity Si before the battery starts to charge in real time by the STM32CPU main control chip, setting the electric quantity at the end of expected charging as St and the expected charging time T, dividing the charging process into N sections, and equalizing the charging electric quantity at each stage;
the charge state updating module is used for updating the charge state SOC before the ith section of the charging process begins;
The current magnitude selection module 1 is used for taking the current C/10 as the minimum electric quantity of a charging cycle when the current state of charge SOC is lower than Sm;
The current magnitude selection module 2, when the current state of charge SOC is between Sm and St, the I-th section current I i in the charging process is:
wherein T CC represents the charging time in a constant current state with a charging period of 25% -95% of SOC, R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, C 0 is the total capacity of the battery, and delta is the self-adaptive coefficient value;
the current magnitude selection module 3 is used for ending the charging process if the current SOC is greater than St;
And the display module is used for repeating the steps S2 to S5 until the charging is completed, and displaying the completion of the charging on the LCD display screen.
Preferably, the R (SOC) is the total internal resistance of the battery, and is formed by the sum of ohmic resistance and polarization resistance.
Preferably, the STM32CPU main control chip is electrically connected with an intelligent gateway, the intelligent gateway is composed of a main board, a wireless board and an interface board, the main board is composed of an FPGA chip, and the interface board supports four serial interfaces including RS232, RS485, RS422 and an analog sampling interface.
Preferably, the R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, the R (SOC) and R i establish a two-dimensional table based on the SOC, the temperature and the internal resistance through experiments, and the data in the middle of the test points are obtained through two-dimensional linear interpolation.
Preferably, the STM32CPU main control chip further includes collecting charging voltage and current values in real time, automatically adjusting the charging voltage and current values based on a variable domain fuzzy control scheme, stopping the charging process after the charging is completed, and displaying the completion of the charging on a display screen.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the application creatively adjusts the charging electric quantity under different charge states by adjusting delta to be an adaptive coefficient value and combining the initial electric quantity Si and setting the electric quantity at the expected charging end to be St-Sm, so that the loss is reduced, the charging heating of a battery is reduced, the service life of the battery is greatly prolonged, the loss is reduced, delta is an adaptive coefficient value, and the current can be rapidly realized according to the expected current state by adjusting the weight of the initial electric quantity Si and the electric quantity at the expected charging end.
Drawings
FIG. 1 is a system diagram of an automatic battery charging method for a new energy automobile according to the present invention;
Detailed Description
As understood by those skilled in the art, as in the background art, in the conventional technology, in the process of changing the internal resistance and the electric quantity of the battery, the different internal resistances and the losses caused by the charged electric quantity are different, how to realize less losses, and many researches are carried out in the prior art, but most of the existing battery charging adopts fixed current or fixed voltage, no loss is considered, or no accurate loss reduction is carried out, so that more losses are caused in the charging process, the generated heat is larger, the service life of the automobile is reduced, in addition, the influence of the electric quantity of the battery on the losses in the charging process is not considered in the prior art, and the automatic adjustment of the current according to the charging expected value is not considered, so that the automatic adjustment of the reduction of the charging loss and the heat dissipation is urgent. In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Example 1:
Fig. 1 is a system diagram of a method for automatically charging a battery of a new energy automobile according to the present application, and in some embodiments, a method for automatically charging a battery of a new energy automobile includes:
The method comprises the following steps that S1, an STM32CPU main control chip collects open-circuit voltage and initial electric quantity Si before a battery starts to charge in real time, sets the electric quantity at the end of expected charging as St and the expected charging time T, divides the charging process into N sections, and has equal charging electric quantity in each stage;
step S2, updating the state of charge SOC before the beginning of the ith section of the charging process;
s3, when the current state of charge SOC is lower than Sm, sm is the minimum electric quantity of a charging cycle, and the current is C/10;
step S4, when the current state of charge SOC is between Sm and St, the ith section current I i in the charging process is as follows:
wherein T CC represents the charging time in a constant current state with a charging period of 25% -95% of SOC, R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, C 0 is the total capacity of the battery, and delta is the self-adaptive coefficient value;
Step S5, if the current SOC is greater than St, ending the charging process;
and S6, repeating the steps S2 to S5 until the charging is completed.
In some embodiments, the R (SOC) is the total internal resistance of the battery, and is composed of the sum of ohmic resistance and polarization resistance.
In some embodiments, the STM32CPU main control chip is electrically connected with an intelligent gateway, the intelligent gateway is composed of a main board, a wireless board and an interface board, the main board is composed of an FPGA chip, and the interface board supports four serial interfaces including RS232, RS485, RS422 and an analog sampling interface.
In some embodiments, the R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, and the R (SOC) and R i establish a two-dimensional table based on the SOC, the temperature and the internal resistance through experiments, and the data in the middle of the test points are obtained through two-dimensional linear interpolation.
The following table shows the relationship between resistance and electric quantity, wherein the unit of resistance is Europe:
In some embodiments, the STM32CPU master control chip further includes collecting charging voltage and current values in real time, automatically adjusting the charging voltage and current values based on a variable domain fuzzy control scheme, stopping the charging process after the charging is completed, and displaying the completion of the charging on a display screen.
Example 2:
the application also provides an automatic charging system of the new energy automobile battery, comprising:
The parameter detection module is used for acquiring open-circuit voltage and initial electric quantity Si before the battery starts to charge in real time by the STM32CPU main control chip, setting the electric quantity at the end of expected charging as St and the expected charging time T, dividing the charging process into N sections, and equalizing the charging electric quantity at each stage;
the charge state updating module is used for updating the charge state SOC before the ith section of the charging process begins;
The current magnitude selection module 1 is used for taking the current C/10 as the minimum electric quantity of a charging cycle when the current state of charge SOC is lower than Sm;
The current magnitude selection module 2, when the current state of charge SOC is between Sm and St, the I-th section current I i in the charging process is:
wherein T CC represents the charging time in a constant current state with a charging period of 25% -95% of SOC, R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, C 0 is the total capacity of the battery, and delta is the self-adaptive coefficient value;
the current magnitude selection module 3 is used for ending the charging process if the current SOC is greater than St;
And the display module is used for repeating the steps S2 to S5 until the charging is completed, and displaying the completion of the charging on the LCD display screen.
In some embodiments, the R (SOC) is the total internal resistance of the battery, and is composed of the sum of ohmic resistance and polarization resistance.
In some embodiments, the STM32CPU main control chip is electrically connected with an intelligent gateway, the intelligent gateway is composed of a main board, a wireless board and an interface board, the main board is composed of an FPGA chip, and the interface board supports four serial interfaces including RS232, RS485, RS422 and an analog sampling interface.
In some embodiments, the R (SOC) is the total internal resistance of the battery, R i is the equivalent internal resistance value of the battery in the ith charging stage, and the R (SOC) and R i establish a two-dimensional table based on the SOC, the temperature and the internal resistance through experiments, and the data in the middle of the test points are obtained through two-dimensional linear interpolation.
In some embodiments, the STM32CPU master control chip further includes collecting charging voltage and current values in real time, automatically adjusting the charging voltage and current values based on a variable domain fuzzy control scheme, stopping the charging process after the charging is completed, and displaying the completion of the charging on a display screen.
The application relates to a method and a system for automatically charging a new energy automobile battery, which solve the problem that the automatic adaptation adjustment cannot be realized due to larger loss in the prior art, creatively set the relation St-Sm of the electric quantity St when the expected charging is finished by adjusting delta to be an adaptive coefficient value and combining with initial electric quantity Si, and adjust the charging electric quantity under different charge states so as to reduce the loss, reduce the charging and heating of the battery, greatly enhance the service life of the battery and reduce the loss; delta is an adaptive coefficient value, and the current can be quickly charged according to the current state expected to be achieved by adjusting the initial electric quantity Si in the process and setting the weight of the electric quantity at the end of expected charging.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product, and that the present application thus may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (10)
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| CN102200568A (en) * | 2010-03-24 | 2011-09-28 | 力旺电子股份有限公司 | Method of estimating remaining capacity and run-time of a battery device |
| WO2012169167A1 (en) * | 2011-06-06 | 2012-12-13 | パナソニック株式会社 | Power supply system and charging method for battery pack |
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| CN107230810B (en) * | 2017-06-01 | 2019-02-15 | 哈尔滨理工大学 | Lithium battery optimized charging current acquisition method |
| WO2021238198A1 (en) * | 2020-05-27 | 2021-12-02 | 广东小天才科技有限公司 | Charging method, charging chip, and terminal device |
| CN111797568A (en) * | 2020-06-16 | 2020-10-20 | 武汉大学深圳研究院 | Lithium battery charging method based on minimum energy consumption |
| CN112103580B (en) * | 2020-09-21 | 2022-04-01 | 武汉大学 | Lithium battery charging method based on equivalent internal resistance |
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| CN102200568A (en) * | 2010-03-24 | 2011-09-28 | 力旺电子股份有限公司 | Method of estimating remaining capacity and run-time of a battery device |
| WO2012169167A1 (en) * | 2011-06-06 | 2012-12-13 | パナソニック株式会社 | Power supply system and charging method for battery pack |
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