CN114940102A - Charge-discharge balancing system for power battery of electric automobile - Google Patents
Charge-discharge balancing system for power battery of electric automobile Download PDFInfo
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- CN114940102A CN114940102A CN202210593753.2A CN202210593753A CN114940102A CN 114940102 A CN114940102 A CN 114940102A CN 202210593753 A CN202210593753 A CN 202210593753A CN 114940102 A CN114940102 A CN 114940102A
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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
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0025—Sequential battery discharge in systems with a plurality of batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a charge-discharge balancing system of an electric automobile power battery, belongs to the field of electric automobile power batteries, and relates to a battery charge-discharge balancing technology, wherein the voltage of a single battery unit node is monitored through a voltage monitoring node; and feeding back to the data analysis module; the data analysis module receives voltage values and corresponding discharge durations of different battery unit nodes; forming a discharge voltage change curve of a battery unit node; the problem battery node is accurately positioned by comparing with the standard curve, and meanwhile, the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the energy balance module; and meanwhile, when the electric vehicle is charged next time, the energy balancing module increases the charging voltage of the problem battery node, so that the service life of the whole energy storage battery pack is greatly prolonged, and the electric vehicle is applied to the electric vehicle with attenuated endurance mileage, so that the endurance mileage is remarkably improved.
Description
Technical Field
The invention belongs to the field of power batteries of electric automobiles, relates to a battery charge-discharge balancing technology, and particularly relates to a charge-discharge balancing system of a power battery of an electric automobile.
Background
In recent years, new energy automobiles show rapid growth, and further the demand and the scrappage of power lithium batteries are continuously increased. The performance of a power battery of the electric automobile is attenuated along with the increase of charging times, and the endurance mileage of the electric automobile is greatly attenuated under the condition of poor battery consistency.
The existing battery still lacks a good detection means in the aspect of consistency monitoring and measurement, and the voltage condition of a certain electric core in the battery pack can not be detected in time, so that the service life of the battery pack is shortened in the discharging process of the battery pack, and the cruising ability of a new energy automobile is further influenced.
Therefore, the invention provides a charging and discharging balancing system for a power battery of an electric automobile.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a charge-discharge balancing system for a power battery of an electric automobile, which is used for finding a discharge curve of a certain battery unit node in a battery pack, comparing the discharge curve with a standard curve, further accurately positioning a problem battery node, and simultaneously transmitting electric energy of other battery unit nodes to the problem battery node through an energy balancing module; when charging next time simultaneously, the energy balance module increases the charging voltage of the problem battery node, the problem of battery uniformity is solved to a certain extent, and then the service life of the battery pack is prolonged, the service life of the whole energy storage battery pack is prolonged greatly, and the energy storage battery pack is applied to an electric vehicle with attenuated endurance mileage, so that the endurance mileage is improved remarkably.
In order to achieve the above object, according to an embodiment of the first aspect of the present invention, a charge and discharge balancing system for a power battery of an electric vehicle is provided, which includes a discharge battery pack composed of a plurality of battery cell nodes, a voltage monitoring module composed of a plurality of voltage monitoring nodes, a battery management module, a data analysis module, and an energy balancing module;
the battery management module comprises a single chip microcomputer and a CAN bus, and the single chip microcomputer and the CAN bus realize bidirectional data connection through a data interface; the voltage monitoring nodes are connected to a CAN bus;
the plurality of battery unit nodes are mutually connected in series, and after the adjacent battery unit nodes are connected in series, a voltage with a fixed voltage value is formed; a plurality of adjacent battery unit nodes are connected in series to form a discharge battery pack;
the energy balancing module comprises a bidirectional DC/DC and switch arrays, a plurality of the bidirectional DC/DC are electrically connected with the switch arrays, the switch arrays are electrically connected with the discharge battery pack, and the switch arrays are connected to the CAN bus so as to be electrically connected with the single chip microcomputer;
the voltage monitoring node is used for monitoring the single voltage of the battery unit node; the voltage monitoring node sends the monitored monomer voltage of the battery unit node to a voltage monitoring module; the voltage monitoring module is connected with the battery management module;
the battery management module is connected with the data analysis module; the data analysis module is used for carrying out data analysis on the received single voltage;
the data analysis module compares the discharge voltage change curve of the battery unit node with the standard discharge voltage change curve to obtain a problem battery node, and feeds the problem battery node back to the battery management module; after the battery management module receives the problem battery node, the battery management module is connected with the energy balancing module, the energy balancing module acquires the corresponding problem battery node, and the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the bidirectional DC/DC and switch array; and meanwhile, when the battery is charged next time, the energy balance module increases the charging voltage of the problem battery node.
Preferably, the voltage monitoring module further comprises a data storage unit, and the data storage unit is used for storing the received cell voltage and sending the stored cell voltage to the data analysis module after receiving the data extraction signal sent by the single chip microcomputer.
Preferably, the data analysis module sends an analysis signal to the battery management module, the battery management module generates a data extraction signal and sends the data extraction signal to the data storage unit through the single chip microcomputer, and the data storage unit feeds back the stored monomer voltage to the data analysis module.
Preferably, the data analysis module receives voltage values of different battery unit nodes and corresponding discharge time; forming a balance investigation coordinate point by the corresponding discharge duration and the corresponding voltage value;
the data analysis module substitutes the balance investigation coordinate points of different battery unit nodes into a balance measuring and calculating coordinate system, and the balance investigation coordinate points are sequentially connected according to the discharge duration to form a discharge voltage change curve of the battery unit nodes.
Preferably, the balanced measuring and calculating coordinate system is set by the battery management module, the balanced measuring and calculating coordinate system is a two-dimensional coordinate system, the abscissa of the balanced measuring and calculating coordinate system is the discharge duration, and the ordinate is the voltage value; the balanced calculation coordinate system is stored in a data storage unit.
Preferably, the process of comparing the discharge voltage variation curve of the battery cell node with the standard discharge voltage variation curve by the data analysis module includes:
placing the discharge voltage change curve of the battery unit node and the standard discharge voltage change curve in the same balanced measurement and calculation coordinate system, subtracting the voltage values corresponding to the same discharge duration, and taking the absolute value as a comparison reference element;
the data analysis module arranges the comparison reference elements according to the numerical value, and takes the maximum numerical value of the comparison reference elements as a comparison reference value.
An embodiment according to a second aspect of the present invention provides a charge and discharge balancing method for a power battery of an electric vehicle, including the following steps:
step 101: when the discharging battery pack discharges, a plurality of voltage monitoring nodes in the voltage monitoring module respectively acquire voltage values of a plurality of battery unit nodes in the discharging battery pack;
step 102: the voltage monitoring node sends the acquired voltage values of the plurality of battery unit nodes in the discharging battery pack to a data storage unit in the battery management module for storage;
step 103: the data analysis module sends an analysis signal to the battery management module, the battery management module generates a data extraction signal and sends the data extraction signal to the data storage unit through the single chip microcomputer, and the data storage unit feeds back the stored monomer voltage to the data analysis module;
step 104: the data analysis module receives voltage values and corresponding discharge time lengths of different battery unit nodes; forming a balance investigation coordinate point by the corresponding discharge duration and the voltage value; substituting the measured voltage into a balance measuring and calculating coordinate system, and sequentially connecting balance investigation coordinate points according to the discharge duration to form a discharge voltage change curve of the battery unit node;
step 105: the data analysis module compares the discharge voltage change curve of the battery unit node with a standard discharge voltage change curve; and obtaining a comparison reference value; the data analysis module marks the battery unit nodes with the comparison reference values larger than the reference threshold value as problem battery nodes and feeds the problem battery nodes back to the battery management module;
step 106: after the battery management module receives the problem battery node, the battery management module is connected with the energy balancing module, the energy balancing module acquires the corresponding problem battery node, and the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the bidirectional DC/DC and switch array; and meanwhile, when the battery is charged next time, the energy balance module increases the charging voltage of the problem battery node.
Compared with the prior art, the invention has the beneficial effects that:
the method monitors the monomer voltage of the battery unit node through the voltage monitoring node; the voltage monitoring node sends the monitored monomer voltage of the battery unit node to a voltage monitoring module; the voltage monitoring module is connected with the battery management module; the battery management module generates a data extraction signal, the data extraction signal is sent to the data storage unit through the single chip microcomputer, and the data storage unit feeds back the stored monomer voltage to the data analysis module; the data analysis module receives voltage values and corresponding discharge time lengths of different battery unit nodes; forming a balance investigation coordinate point by the corresponding discharge duration and the voltage value; substituting the measured voltage into a balance measuring and calculating coordinate system, and sequentially connecting balance investigation coordinate points according to the discharge duration to form a discharge voltage change curve of the battery unit node;
the problem battery node is accurately positioned by comparing with the standard curve, and meanwhile, the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the energy balance module; when charging next time simultaneously, the energy balance module increases the charging voltage of the problem battery node, the problem of battery uniformity is solved to a certain extent, and then the service life of the battery pack is prolonged, the service life of the whole energy storage battery pack is prolonged greatly, and the energy storage battery pack is applied to an electric vehicle with attenuated endurance mileage, so that the endurance mileage is improved remarkably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a flow chart of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a charge-discharge balancing system for a power battery of an electric vehicle includes a discharge battery pack composed of a plurality of battery unit nodes, a voltage monitoring module composed of a plurality of voltage monitoring nodes, a battery management module, a data analysis module, and an energy balancing module;
in the application, the battery management module comprises a single chip microcomputer and a CAN bus, and the single chip microcomputer and the CAN bus realize bidirectional data connection through a data interface;
the voltage monitoring nodes are connected to a CAN bus;
wherein a plurality of the battery unit nodes form a discharge battery pack; the plurality of battery unit nodes are connected in series, and after the adjacent battery unit nodes are connected in series, a voltage with a fixed voltage value is formed and is used for providing electric energy; the discharging battery pack is formed by connecting a plurality of adjacent battery unit nodes in series and is used for providing electric energy for the power battery system;
the energy balancing module comprises bidirectional DC/DC and switch arrays, a plurality of the bidirectional DC/DC are electrically connected with the switch arrays, the switch arrays are electrically connected with the discharge battery pack, and the switch arrays are connected to the CAN bus so as to be electrically connected with the single chip microcomputer;
in the present application, the voltage monitoring node is configured to monitor a cell voltage of a cell node; meanwhile, the voltage monitoring node sends the monitored single voltage of the battery unit node to a voltage monitoring module;
the voltage monitoring module is connected with the battery management module; the battery management module is connected with the data analysis module, the voltage monitoring module further comprises a data storage unit, and the data storage unit is used for storing the received monomer voltage and sending the stored monomer voltage to the data analysis module after receiving a data extraction signal sent by the single chip microcomputer;
the data analysis module is configured to perform data analysis on the received cell voltage, and specifically, the process of performing data analysis on the cell voltage by the data analysis module includes the following steps:
the method comprises the following steps: the data analysis module sends an analysis signal to the battery management module, the battery management module generates a data extraction signal and sends the data extraction signal to the data storage unit through the single chip microcomputer, and the data storage unit feeds back the stored monomer voltage to the data analysis module;
step two: the data analysis module receives voltage values and corresponding discharge durations of different battery unit nodes; forming a balance investigation coordinate point by the corresponding discharge duration and the corresponding voltage value;
it should be noted that the discharge time period is a discharge time period in which the discharge battery pack is not subjected to secondary charging after being charged once; the discharging battery pack does not work all the time, so the discharging time of the battery pack discharging method is the actual discharging time of the discharging battery pack;
step three: the data analysis module substitutes the equilibrium investigation coordinate points of different battery unit nodes into an equilibrium measurement and calculation coordinate system, and the equilibrium investigation coordinate points are sequentially connected according to the discharge duration to form a discharge voltage change curve of the battery unit nodes;
in the application, the balanced measurement and calculation coordinate system is set by the battery management module, the balanced measurement and calculation coordinate system is a two-dimensional coordinate system, the abscissa of the balanced measurement and calculation coordinate system is the discharge duration, and the ordinate is the voltage value; the balanced measuring and calculating coordinate system is stored in a data storage unit;
step four: the data analysis module compares the discharge voltage change curve of the battery unit node with a standard discharge voltage change curve; and obtaining a comparison reference value; a reference threshold value is also stored in the data storage unit;
step five: the data analysis module marks the battery unit nodes with the comparison reference values larger than the reference threshold value as problem battery nodes and feeds the problem battery nodes back to the battery management module;
it should be noted that the process of comparing the discharge voltage variation curve of the battery cell node with the standard discharge voltage variation curve by the data analysis module includes:
placing the discharge voltage change curve of the battery unit node and the standard discharge voltage change curve in the same balanced measurement and calculation coordinate system, subtracting the voltage values corresponding to the same discharge duration, and taking the absolute value as a comparison reference element;
the data analysis module arranges the comparison reference elements according to the numerical value, and takes the maximum numerical value of the comparison reference elements as a comparison reference value;
in the application, after the battery management module receives a problem battery node, the battery management module is connected with the energy balancing module, the energy balancing module acquires the corresponding problem battery node, and the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the bidirectional DC/DC and switch array; and meanwhile, when the battery is charged next time, the energy balance module increases the charging voltage of the problem battery node.
As shown in fig. 2, a method for balancing charging and discharging of a power battery of an electric vehicle includes the following steps:
step 101: when the discharging battery pack discharges, a plurality of voltage monitoring nodes in the voltage monitoring module respectively acquire voltage values of a plurality of battery unit nodes in the discharging battery pack;
step 102: the voltage monitoring node sends the acquired voltage values of the plurality of battery unit nodes in the discharging battery pack to a data storage unit in the battery management module for storage;
step 103: the data analysis module sends an analysis signal to the battery management module, the battery management module generates a data extraction signal and sends the data extraction signal to the data storage unit through the single chip microcomputer, and the data storage unit feeds back the stored monomer voltage to the data analysis module;
step 104: the data analysis module receives voltage values and corresponding discharge time lengths of different battery unit nodes; forming a balance investigation coordinate point by the corresponding discharge duration and the corresponding voltage value; substituting the measured voltage into a balance measuring and calculating coordinate system, and sequentially connecting balance investigation coordinate points according to the discharge duration to form a discharge voltage change curve of the battery unit node;
step 105: the data analysis module compares the discharge voltage change curve of the battery unit node with a standard discharge voltage change curve; and obtaining a comparison reference value; the data analysis module marks the battery unit nodes with the comparison reference values larger than the reference threshold value as problem battery nodes and feeds the problem battery nodes back to the battery management module;
step 106: after the battery management module receives the problem battery node, the battery management module is connected with the energy balancing module, the energy balancing module acquires the corresponding problem battery node, and the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the bidirectional DC/DC and switch array; and meanwhile, when the battery is charged next time, the energy balance module increases the charging voltage of the problem battery node.
The above formulas are all calculated by removing dimensions and taking numerical values thereof, the formula is a formula which is obtained by acquiring a large amount of data and performing software simulation to obtain the most approximate real condition, and the preset parameters and the preset threshold values in the formula are set by the technical personnel in the field according to the actual condition or obtained by simulating a large amount of data.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (6)
1. A charging and discharging balancing system for a power battery of an electric automobile is characterized by comprising a discharging battery pack consisting of a plurality of battery unit nodes, a voltage monitoring module consisting of a plurality of voltage monitoring nodes, a battery management module, a data analysis module and an energy balancing module;
the battery management module comprises a single chip microcomputer and a CAN bus, and the single chip microcomputer and the CAN bus realize bidirectional data connection through a data interface; the voltage monitoring nodes are connected to a CAN bus;
the plurality of battery unit nodes are mutually connected in series, and after the adjacent battery unit nodes are connected in series, a voltage with a fixed voltage value is formed; a plurality of adjacent battery unit nodes are connected in series to form a discharge battery pack;
the energy balancing module comprises a bidirectional DC/DC and switch arrays, a plurality of the bidirectional DC/DC are electrically connected with the switch arrays, the switch arrays are electrically connected with the discharge battery pack, and the switch arrays are connected to the CAN bus so as to be electrically connected with the single chip microcomputer;
the voltage monitoring node is used for monitoring the single voltage of the battery unit node; the voltage monitoring node sends the monitored monomer voltage of the battery unit node to a voltage monitoring module; the voltage monitoring module is connected with the battery management module;
the battery management module is connected with the data analysis module; the data analysis module is used for carrying out data analysis on the received single voltage;
the data analysis module compares the discharge voltage change curve of the battery unit node with the standard discharge voltage change curve to obtain a problem battery node, and feeds the problem battery node back to the battery management module; after the battery management module receives the problem battery node, the battery management module is connected with the energy balancing module, the energy balancing module acquires the corresponding problem battery node, and the electric energy of the rest battery unit nodes is transmitted to the problem battery node through the bidirectional DC/DC and switch array; and meanwhile, when the battery is charged next time, the energy balance module increases the charging voltage of the problem battery node.
2. The electric vehicle power battery charge-discharge equalization system of claim 1, characterized in that the voltage monitoring module further comprises a data storage unit, and the data storage unit is configured to store the received cell voltages and send the stored cell voltages to the data analysis module after receiving a data extraction signal sent by the single chip microcomputer.
3. The electric vehicle power battery charge-discharge equalization system of claim 2, characterized in that the data analysis module sends an analysis signal to the battery management module, the battery management module generates a data extraction signal and sends the data extraction signal to the data storage unit through the single chip microcomputer, and the data storage unit feeds back the stored cell voltage to the data analysis module.
4. The charge-discharge balancing system for the power battery of the electric automobile as claimed in claim 3, wherein the data analysis module receives voltage values and corresponding discharge durations of different battery unit nodes; forming a balance investigation coordinate point by the corresponding discharge duration and the voltage value;
the data analysis module substitutes the balance investigation coordinate points of different battery unit nodes into a balance measuring and calculating coordinate system, and the balance investigation coordinate points are sequentially connected according to the discharge duration to form a discharge voltage change curve of the battery unit nodes.
5. The charging and discharging balancing system for the power battery of the electric vehicle as claimed in claim 4, wherein the balancing calculation coordinate system is set by the battery management module and is a two-dimensional coordinate system, wherein the abscissa of the balancing calculation coordinate system is a discharging time length and the ordinate is a voltage value; the balanced calculation coordinate system is stored in a data storage unit.
6. The system for equalizing charge and discharge of a power battery of an electric vehicle as claimed in claim 5, wherein the process of comparing the discharge voltage variation curve of the battery cell node with the standard discharge voltage variation curve by the data analysis module comprises:
placing the discharge voltage change curve of the battery unit node and the standard discharge voltage change curve in the same balanced measurement and calculation coordinate system, subtracting the voltage values corresponding to the same discharge duration, and taking the absolute value as a comparison reference element;
the data analysis module arranges the comparison reference elements according to the numerical value, and takes the maximum numerical value of the comparison reference elements as a comparison reference value;
and the data analysis module marks the battery unit nodes with the comparison reference values larger than the reference threshold value as problem battery nodes and feeds the problem battery nodes back to the battery management module.
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| CN202210593753.2A CN114940102B (en) | 2022-05-27 | 2022-05-27 | Charge-discharge balancing system for power battery of electric automobile |
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| CN114156552A (en) * | 2021-11-28 | 2022-03-08 | 南京理工大学 | Equalization control strategy of serial battery pack considering aging |
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2022
- 2022-05-27 CN CN202210593753.2A patent/CN114940102B/en active Active
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| US20150364935A1 (en) * | 2012-12-11 | 2015-12-17 | Samsung Sdi Co., Ltd. | Method for Battery Module Balancing and Battery Management System |
| US20190047438A1 (en) * | 2016-02-23 | 2019-02-14 | Continental Automotive Gmbh | Battery System with a Voltage Equalizing Circuit |
| CN110293880A (en) * | 2019-07-09 | 2019-10-01 | 中国计量大学 | Electric car power supply acquisition and balanced management method |
| CN111572405A (en) * | 2020-05-22 | 2020-08-25 | 安徽安凯汽车股份有限公司 | Active equalization system and method for lithium battery |
| CN113879178A (en) * | 2021-10-26 | 2022-01-04 | 华晨鑫源重庆汽车有限公司 | Charging control method and device for vehicle |
| CN114156552A (en) * | 2021-11-28 | 2022-03-08 | 南京理工大学 | Equalization control strategy of serial battery pack considering aging |
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