CN113561848A - Electric vehicle power battery charging and discharging control system and method - Google Patents
Electric vehicle power battery charging and discharging control system and method Download PDFInfo
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- CN113561848A CN113561848A CN202110732180.2A CN202110732180A CN113561848A CN 113561848 A CN113561848 A CN 113561848A CN 202110732180 A CN202110732180 A CN 202110732180A CN 113561848 A CN113561848 A CN 113561848A
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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
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a charging and discharging control system and method for a power battery of an electric automobile. In the high-voltage discharging process of the power battery, if at least one of the first relay and the second relay is closed or adhered due to faults, the battery management module can detect the fault closing or adhering state of the first relay and/or the second relay so as to control the first control switch and the second control switch to be switched off, and can only control the control switch of the branch where the fault closing or adhering is located to be switched off, so that the short-circuit fault can be eliminated when the electric core group is in short circuit, and the driving safety is improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a system and a method for controlling charging and discharging of a power battery of an electric automobile.
Background
Fig. 1 shows a charging and discharging management device for a power battery of a commercial electric vehicle, which includes two identical battery packs, where the battery packs can be connected to a load and a charging pile. When the relay K1-K2 is disconnected and the relay K3 is closed, the two battery packs are connected in series, so that the power battery can discharge a load under high voltage or charge the power battery by a high-voltage charging pile; when the relay K1-K2 is closed and the relay K3 is disconnected, the two battery packs are connected in parallel, and the charging of the power battery by the low-voltage charging pile can be realized. Therefore, the power battery charging and discharging management device shown in fig. 1 can realize the charging management of the power battery by the driving and high-low voltage charging pile under high voltage, and has wide market prospect.
However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:
in the process of discharging a load by a power battery under high voltage, namely in the process of high-voltage driving, a relay K1-K2 connected with a battery pack in parallel may be closed or adhered due to faults, so that a battery system is short-circuited, the current of a loop where the battery system is located is rapidly increased, and the driving safety is affected.
Disclosure of Invention
The embodiment of the application provides a system and a method for controlling charging and discharging of a power battery of an electric vehicle, solves the technical problem that a short-circuit fault is caused by the fact that a parallel relay of a battery pack is closed or adhered when a fault occurs in the high-voltage discharging process of the power battery in the prior art, achieves the technical effect of eliminating the short-circuit fault when a battery pack is short-circuited in the high-voltage discharging process of the power battery, and improves the driving safety.
On one hand, the present application provides the following technical solutions through an embodiment of the present application:
a charging and discharging control system for a power battery of an electric automobile comprises a first battery core group, a second battery core group, a first relay, a second relay, a battery management module, a first control switch and a second control switch;
the positive electrode of the first electric core group is connected with the positive electrode of the second electric core group through the first relay and the first control switch which are connected in series, the negative electrode of the first electric core group is connected with the negative electrode of the second electric core group through the second relay and the second control switch which are connected in series, and the negative electrode of the first electric core group is connected with the positive electrode of the second electric core group;
the battery management module is respectively connected with the first relay, the second relay, the first control switch and the control end of the second control switch, the battery management module is used for detecting the state of the first relay and the state of the second relay, and controlling the first control switch and the second control switch to be disconnected when the state of the first relay and/or the state of the second relay is a target state, and the target state is a fault closing state or an adhesion state.
Preferably, the first control switch or the second control switch comprises an energized fuse.
Preferably, the electric vehicle power battery charging and discharging control system further comprises a third relay, the third relay is connected in series between the negative electrode of the first electric core group and the positive electrode of the second electric core group, and the control end of the third relay is connected with the battery management module.
Preferably, the electric vehicle power battery charging and discharging control system further comprises a positive relay and a negative relay;
the positive relay is connected between the positive electrode of the first electric core group and a load in series, the negative relay is connected between the negative electrode of the second electric core group and the load in series, and the control ends of the positive relay and the negative relay are connected with the battery management module.
Preferably, the electric vehicle power battery charging and discharging control system further comprises a pre-charging resistor and a pre-charging relay;
the pre-charging resistor is connected between the anode of the first cell core group and a load after being connected with the pre-charging relay in series, and the control end of the pre-charging relay is connected with the battery management module.
Preferably, the electric vehicle power battery charging and discharging control system further comprises a charging relay, the positive electrode of a low-voltage charging interface of the electric vehicle is connected with the positive electrode of the first electric core group through the charging relay, the negative electrode of the low-voltage charging interface is connected with the negative electrode of the second electric core group, and the control end of the charging relay is connected with the battery management module.
Preferably, the electric vehicle power battery charging and discharging control system further comprises a current transformer, the current transformer is connected in series between the positive electrode of the first electric core group and the positive electrode of the low-voltage charging interface, and the output end of the current transformer is connected with the battery management module.
Preferably, the positive electrode of the high-voltage charging interface of the electric automobile is connected with the positive electrode of the first electric core group through the charging relay.
Preferably, the electric vehicle power battery charging and discharging control system further comprises a first fuse, and the first fuse is connected in series between the negative electrode of the first electric core group and the positive electrode of the second electric core group.
Preferably, the first electric core group and the second electric core group are both formed by connecting a plurality of same electric cores in series, and the number of the electric cores in the first electric core group and the second electric core group is the same.
On the other hand, the present application provides the following technical solutions through an embodiment of the present application:
a charging and discharging control method for a power battery of an electric automobile is applied to a battery management module, the battery management module is positioned in any one of the charging and discharging control systems for the power battery of the electric automobile, and the method comprises the following steps:
detecting the state of the first relay and the state of the second relay in the driving process of the electric automobile;
and when the state of the first relay and/or the state of the second relay is a target state, controlling the first control switch and the second control switch to be switched off, wherein the target state is a fault closing state or an adhesion state.
Preferably, the method for controlling charging and discharging of the power battery of the electric vehicle further comprises:
when the electric automobile is electrified, the first relay and the second relay are controlled to be disconnected, and the pre-charging relay, the cathode relay and the third relay are controlled to be closed;
and after the pre-charging relay is closed for a certain time, controlling the positive relay to be closed and the pre-charging relay to be opened.
Preferably, when electric automobile was electrified, control first relay and the disconnection of second relay, control preliminary filling relay, negative pole relay and third relay are closed, include:
when the electric automobile is powered on, the first relay and the second relay are controlled to be disconnected;
after the first relay and the second relay are disconnected for a certain time, controlling the third relay to be closed;
and controlling the pre-charging relay and the negative relay to be closed.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
in the power battery high-voltage discharge process, if at least one of the first relay and the second relay is in fault closure or adhesion, the battery management module can detect the fault closure or adhesion state of the first relay and/or the second relay so as to control the disconnection of the first control switch and the second control switch, so that the short-circuit fault can be eliminated when the cell group is in short circuit, and the driving safety is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a partial circuit diagram of a prior art electric vehicle power battery charge-discharge control system;
FIG. 2 is a circuit diagram of a power battery charging and discharging control system of an electric vehicle according to the present invention;
FIG. 3 is a flow chart of a method for controlling charging and discharging of a power battery of an electric vehicle according to the present invention;
FIG. 4 is another flowchart of the method for controlling the charging and discharging of the power battery of the electric vehicle according to the present invention;
fig. 5 is a flowchart of step S21 of the present invention.
Detailed Description
The embodiment of the application provides a system and a method for controlling charging and discharging of a power battery of an electric vehicle, and solves the technical problem that a short-circuit fault is caused by fault closing or adhesion of a parallel relay of a battery pack in the high-voltage discharging process of the power battery in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the utility model provides an electric automobile power battery control system that charges and discharges, includes first electric core group, second electric core group, first relay, second relay, battery management module, first control switch and second control switch. The positive pole of the first electric core group is connected with the positive pole of the second electric core group through the first relay and the first control switch which are connected in series, the negative pole of the first electric core group is connected with the negative pole of the second electric core group through the second relay and the second control switch which are connected in series, and the negative pole of the first electric core group is connected with the positive pole of the second electric core group. The battery management module is respectively connected with the control ends of the first relay, the second relay, the first control switch and the second control switch, and is used for detecting the state of the first relay and the state of the second relay and controlling the first control switch and the second control switch to be switched off when the state of the first relay and/or the state of the second relay are in a target state, wherein the target state is a fault closing state or an adhesion state.
A method for controlling the charging and discharging of a power battery of an electric automobile is applied to a battery management module, wherein the battery management module is positioned in the charging and discharging control system of the power battery of the electric automobile and comprises the following steps:
detecting the state of the first relay and the state of the second relay in the driving process of the electric automobile;
and when the state of the first relay and/or the state of the second relay is a target state, controlling the first control switch and the second control switch to be switched off, wherein the target state is a fault closing state or an adhesion state.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Example one
As shown in fig. 2, the electric vehicle power battery charging and discharging control system of the embodiment further includes a third relay, a first fuse, a positive relay, a negative relay, a pre-charge resistor, a pre-charge relay, a charge relay, and a current transformer.
In this embodiment, the third relay is generally used to realize the connection between the negative electrode of the first electric core group and the positive electrode of the second electric core group, the third relay is connected in series between the negative electrode of the first electric core group and the positive electrode of the second electric core group, and the control end of the third relay is connected to the battery management module. The first battery pack, the second battery pack, the first relay, the second relay and the third relay in fig. 2 are respectively equivalent to the first battery pack, the second battery pack, the relay K1, the relay K2 and the relay K3 in fig. 1, that is, when the first relay is disconnected from the second relay and the third relay is closed, the first battery pack and the second battery pack are connected in series; when the first relay and the second relay are closed and the third relay is opened, the first electric core group and the second electric core group are connected in parallel. The voltage grades of the first electric core group and the second electric core group are the same and are set as v1, the system voltage is 2v1 when the first electric core group and the second electric core group are connected in series, and the system voltage is v1 when the first electric core group and the second electric core group are connected in parallel. First electric core group and second electric core group all can establish ties by a plurality of the same electric cores and constitute, and in order to guarantee that first electric core group and second electric core group voltage between them when parallelly connected equals this moment, the number of electric core is the same in first electric core group, the second electric core group. The first electric core group and the second electric core group can be different in constitution, and the voltage of the first electric core group and the second electric core group is equal only by satisfying, if the first electric core group is connected in series by m electric cores with n volts, and the second electric core group is connected in series by n electric cores with m volts.
The positive relay is connected between the positive pole of the first electric core group and the load in series, the negative relay is connected between the negative pole of the second electric core group and the load in series, and the control ends of the positive relay and the negative relay are connected with the battery management module. The pre-charging resistor is connected between the anode of the first cell group and the load after being connected with the pre-charging relay in series, and the control end of the pre-charging relay is connected with the battery management module. Therefore, a series branch formed by the pre-charging resistor and the pre-charging relay and the anode relay form a parallel relation.
The positive pole of the high-voltage charging interface and the positive pole of the low-voltage charging interface of the electric automobile can be connected with the positive pole of the first electric core group through the charging relay, the current transformer is connected between the positive pole of the first electric core group and the positive pole of the low-voltage charging interface in series, the negative pole of the high-voltage charging interface and the negative pole of the low-voltage charging interface can be connected with the negative pole of the second electric core group through the negative pole relay, and the control end of the charging relay and the output end of the current transformer are respectively connected with the battery management module.
The first fuse is connected in series between the negative electrode of the first electric core group and the positive electrode of the second electric core group, namely the third relay and the first fuse are also connected in series without being divided into a front sequence and a rear sequence.
In this embodiment, the battery management module is configured to control the on and off of the first control switch, the second control switch, the first relay, the second relay, the third relay, the positive relay, the negative relay, the precharge relay, and the charging relay.
Generally, driving of the electric vehicle needs to be performed in a state that the power battery outputs high voltage, that is, the first electric core group and the second electric core group are required to be connected in series. In this embodiment, when the electric vehicle needs to drive, the high-voltage power-on logic is: the battery management module checks the states of all relays, including the first relay and the second relay, and gives an alarm if the relays are closed or adhered due to faults; if all the relays are in normal states, the battery management module controls other relays to be switched off, including the first relay and the second relay, and controls the third relay to be switched on after the first relay and the second relay are switched off for a certain time, such as 0.3 s; the battery management module controls the closing of the pre-charging relay and the negative relay to pre-charge the capacitive load, and the pre-charging time is determined by system parameters; after the pre-charging is finished, the battery management module controls the pre-charging relay to be disconnected and controls the positive pole relay to be closed, and at the moment, the power supply voltage of the two battery cell groups to the load is 2v 1. The positive relay and the negative relay are used for controlling the start and the end of high-voltage discharge. The rated voltage of the electric load for the whole vehicle is set to be 2v1, at the moment, the electric core group can output 2v1 voltage to supply power to the electric load for the whole vehicle, and certainly, the voltage of a battery system and the rated voltage 2v1 of the electric load for the whole vehicle can also be improved, so that the system power and the system energy utilization rate are improved.
In the high-voltage discharging process, namely in the driving process, if at least one of the first relay and the second relay is in fault closing or adhesion, the battery management module can detect the fault closing or adhesion state of the first relay and/or the second relay so as to control the first control switch and the second control switch to be switched off, so that the short-circuit fault can be eliminated when the electric core group is in short circuit, and the driving safety is improved; and the electric core group still keeps high-voltage output at the moment, so that the vehicle can still normally run for a period of time and stably stop. When the fault closing or adhesion occurs, only the control switch of the branch where the fault closing or adhesion occurs may be controlled to be opened, but for safety, it is preferable that both the first control switch and the second control switch are opened. In addition, because the state of first relay, second relay has also been detected before the electricity, if any one in first relay before the driving, the second relay has trouble closure or adhesion, it can lead to the short circuit danger to close the third relay again, cause the vehicle can't travel, this embodiment before the driving, before closing the third relay, equally can control first control switch and second control switch disconnection when first relay and/or second relay trouble closure or adhesion, avoid taking place the short circuit, avoided the vehicle can't travel.
Wherein, the adhesion refers to the state that the relay can not be closed after power failure.
Further, the first control switch and the second control switch in the present embodiment include, but are not limited to, an actuated fuse. Unlike common fuses, the excitation fuse does not cut off a loop by melting a melt due to temperature rise after overload, but is immediately fused after receiving a cut-off command, namely, a battery management module is required to control the on-off.
Because there is certain reaction time between the opening and closing of the relay, if the first relay and the second relay are opened and the third relay is controlled to be closed at the same time in the electrifying process, the situation that the first relay and the second relay are not opened and the third relay is closed exists, and short-circuit fault is caused. This embodiment closes the third relay after a certain time after breaking first relay, second relay, can avoid because the short circuit fault that the relay reaction time caused opens and shuts.
Because the traveling crane is a high-voltage discharge process, if the positive relay and the negative relay are directly closed to supply power to the load without pre-charging, the capacitive load is impacted by a large current, and the capacitive load may be damaged. In this embodiment, before the positive relay is closed, the pre-charge relay and the negative relay are closed, the high voltage generates a small current after passing through the pre-charge resistor to pre-charge the capacitive load, and the high voltage power supply is performed after a certain voltage is established on the capacitive load, so that the impact of a large current can be avoided, and a protection effect is achieved.
When the vehicle needs to be parked, the high-voltage electricity needs to be disconnected, and the electricity logic under the high voltage is as follows: the battery management module controls the positive relay and the negative relay to be disconnected, and after a certain time, if the time is not less than 0.3s, the third relay is controlled to be disconnected.
In this embodiment, if electric automobile needs to charge, if the outside charging environment is the high voltage charging stake, insert the high voltage charging interface after when the high voltage charging stake, battery management module can detect the voltage level matching between them, steerable first relay and the disconnection of second relay, charging relay and third relay are closed, first electric core group and second electric core group are established ties, the high voltage charging stake can provide the voltage of 2v1 and charge two electric core groups, begin high voltage charging.
When the high-voltage driving or the high-voltage charging is carried out, if the overload occurs, the temperature rise of the first fuse leads to the melt to melt, so that the charging loop is cut off, and the effect of cutting off the charging loop when the high-voltage driving or the high-voltage charging is overloaded is achieved.
If the electric pile is filled for the low pressure in outside charging environment, fill electric pile and insert the low pressure interface that charges when the low pressure after, battery management module can detect voltage level matching between them, steerable first relay, second relay and charging relay closure, third relay disconnection, first electric core group and second electric core group are parallelly connected, and the low pressure is filled electric pile and can be provided v 1's voltage and charge two electric core groups, begins the low pressure and charges. When the low-voltage charging is carried out, the first control switch and the second control switch can also play a role in ensuring the safety of the low-voltage charging. When the low-voltage charging is carried out, if the charging current output by the low-voltage charging interface is overlarge, namely, the main circuit current is overlarge, the parallel electric core group can be damaged, a current transformer is additionally arranged in the circuit, the current transformer is used for detecting the charging current output by the low-voltage charging interface, namely, the main circuit current, and inputs the current value into the battery management module, the battery management module carries out low-voltage charging control according to the size of the charging current, if the low-voltage charging main circuit current is overlarge, if the low-voltage charging main circuit current is larger than a set threshold value, if the low-voltage charging main circuit current is 1000A, the current transformer transmits the detected charging current to the battery management module, the battery management module judges that the main circuit current is overlarge, the first control switch and the second control switch can be controlled to be simultaneously disconnected, and the charging loop is cut off. Therefore, the first control switch, the second control switch and the current transformer are cooperated to cut off the charging loop when the current of the low-voltage charging main circuit is too large.
Like this, the electric automobile power battery charge-discharge control system of this embodiment realizes the switching of whole high-voltage system between two high-low voltage platforms through changing the series-parallel relation between the electric core group to can match the electric pile that fills of different voltage specifications.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
in the high-voltage discharging process, if at least one of the first relay and the second relay is closed or adhered due to a fault, the battery management module can detect the fault closing or adhering state of the first relay and/or the second relay so as to control the first control switch and the second control switch to be switched off, so that the short-circuit fault can be eliminated when the electric core group is in short circuit, and the driving safety is improved; and the electric core group still keeps high-voltage output at the moment, so that the vehicle can still normally run for a period of time and stably stop.
Example two
An embodiment of the present application provides a method for controlling charging and discharging of a power battery of an electric vehicle, which is applied to a battery management module, where the battery management module is located in the charging and discharging control system of the power battery of the electric vehicle in any one of the embodiments, as shown in fig. 3, the method includes:
step S11, detecting the state of the first relay and the state of the second relay in the driving process of the electric automobile;
and step S12, when the state of the first relay and/or the state of the second relay is a target state, controlling the first control switch and the second control switch to be switched off, wherein the target state is a fault closing state or an adhesion state.
As shown in fig. 4, the method for controlling charging and discharging of the power battery of the electric vehicle according to the embodiment further includes:
step S21, when the electric automobile is electrified, the first relay and the second relay are controlled to be disconnected, and the pre-charging relay, the cathode relay and the third relay are controlled to be closed; and step S22, after the pre-charging relay is closed for a certain time, the positive pole relay is controlled to be closed and the pre-charging relay is controlled to be opened.
Further, as shown in fig. 5, step S21 includes: step S211, when the electric automobile is electrified, detecting the states of all relays, and if the states of all relays are normal, controlling the first relay and the second relay to be disconnected; step S212, after the first relay and the second relay are disconnected for a certain time, controlling the third relay to be closed; and step S213, controlling the closing of the pre-charging relay and the negative relay.
Specifically, when the electric vehicle needs to be powered on during driving, the high-voltage power-on logic is as follows: the battery management module checks the states of all relays, including the first relay and the second relay, and gives an alarm if the relays are closed or adhered due to faults; if all the relays are in normal states, the battery management module controls other relays to be switched off, including the first relay and the second relay, and controls the third relay to be switched on after the first relay and the second relay are switched off for a certain time, such as 0.3 s; the battery management module controls the closing of the pre-charging relay and the negative relay to pre-charge the capacitive load, and the pre-charging time is determined by system parameters; after the pre-charging is finished, the battery management module controls the pre-charging relay to be disconnected and controls the positive pole relay to be closed, and at the moment, the power supply voltage of the two battery cell groups to the load is 2v 1. The rated voltage of the electric load for the whole vehicle is set to be 2v1, at the moment, the electric core group can output 2v1 voltage to supply power to the electric load for the whole vehicle, and certainly, the voltage of a battery system and the rated voltage 2v1 of the electric load for the whole vehicle can also be improved, so that the system power and the system energy utilization rate are improved. In the driving process of the electric automobile, the battery management module can continuously detect the states of the first relay and the second relay, and the battery management module controls the first control switch and the second control switch to be switched off when detecting that the first relay and/or the second relay are closed or adhered in fault.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
in the driving process, if at least one of the first relay and the second relay is closed or adhered due to faults, the battery management module can detect the fault closing or adhering state of the first relay and/or the second relay so as to control the first control switch and the second control switch to be switched off, so that the short-circuit fault can be eliminated when the electric core group is short-circuited, and the driving safety is improved; and the electric core group still keeps high-voltage output at the moment, so that the vehicle can still normally run for a period of time and stably stop. Because the state of first relay, second relay has also been detected when the electricity was last, if any one in first relay before the driving, the second relay has trouble closure or adhesion, it can lead to the short circuit danger to close the third relay again, cause the vehicle can't travel, this embodiment is before the driving, before closing the third relay, also can control first control switch and second control switch disconnection when first relay and/or second relay trouble closure or adhesion, avoid taking place the short circuit, avoided the vehicle can't travel. Because the driving is the high-voltage discharge process, if the positive relay and the negative relay are directly closed to supply power to the load without pre-charging, the large current has an impact effect on the capacitive load and may damage the capacitive load. Because there is certain reaction time in relay disconnection and closure, the electricity in-process, if control third relay closure when breaking first relay, second relay, then there is first relay, second relay still not break off and the circumstances that third relay is closed, causes short circuit fault, and this embodiment reclosures third relay a certain time after breaking first relay, second relay, can avoid because the relay reaction time that opens and shuts causes short circuit fault.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A charging and discharging control system for a power battery of an electric automobile comprises a first battery core group, a second battery core group, a first relay and a second relay, and is characterized by further comprising a battery management module, a first control switch and a second control switch;
the positive electrode of the first electric core group is connected with the positive electrode of the second electric core group through the first relay and the first control switch which are connected in series, the negative electrode of the first electric core group is connected with the negative electrode of the second electric core group through the second relay and the second control switch which are connected in series, and the negative electrode of the first electric core group is connected with the positive electrode of the second electric core group;
the battery management module is respectively connected with the first relay, the second relay, the first control switch and the control end of the second control switch, the battery management module is used for detecting the state of the first relay and the state of the second relay, and controlling the first control switch and the second control switch to be disconnected when the state of the first relay and/or the state of the second relay is a target state, and the target state is a fault closing state or an adhesion state.
2. The electric vehicle power battery charge and discharge control system of claim 1, wherein the first control switch or the second control switch comprises an energized fuse.
3. The electric vehicle power battery charging and discharging control system of claim 1, further comprising a third relay, wherein the third relay is connected in series between the negative electrode of the first battery pack and the positive electrode of the second battery pack, and a control end of the third relay is connected to the battery management module.
4. The electric vehicle power battery charge and discharge control system of claim 3, further comprising a positive relay and a negative relay;
the positive relay is connected between the positive electrode of the first electric core group and a load in series, the negative relay is connected between the negative electrode of the second electric core group and the load in series, and the control ends of the positive relay and the negative relay are connected with the battery management module.
5. The electric vehicle power battery charge and discharge control system of claim 4, further comprising a pre-charge resistor and a pre-charge relay;
the pre-charging resistor is connected between the anode of the first cell core group and a load after being connected with the pre-charging relay in series, and the control end of the pre-charging relay is connected with the battery management module.
6. The electric vehicle power battery charging and discharging control system of claim 3, further comprising a charging relay, wherein the positive electrode of the low-voltage charging interface of the electric vehicle is connected with the positive electrode of the first electric core group through the charging relay, the negative electrode of the low-voltage charging interface is connected with the negative electrode of the second electric core group, and the control end of the charging relay is connected with the battery management module.
7. The electric vehicle power battery charge-discharge control system of claim 6, further comprising a current transformer, wherein the current transformer is connected in series between the positive electrode of the first electric core group and the positive electrode of the low-voltage charging interface, and an output end of the current transformer is connected to the battery management module.
8. The electric vehicle power battery charging and discharging control system as claimed in claim 6, wherein the positive electrode of the high-voltage charging interface of the electric vehicle is connected with the positive electrode of the first electric core group through the charging relay.
9. A method for controlling charging and discharging of a power battery of an electric automobile is applied to a battery management module, wherein the battery management module is positioned in the system for controlling charging and discharging of the power battery of the electric automobile as claimed in any one of claims 1 to 8, and comprises the following steps:
detecting the state of the first relay and the state of the second relay in the driving process of the electric automobile;
and when the state of the first relay and/or the state of the second relay is a target state, controlling the first control switch and the second control switch to be switched off, wherein the target state is a fault closing state or an adhesion state.
10. The electric vehicle power battery charging and discharging control method according to claim 9, further comprising:
when the electric automobile is electrified, the first relay and the second relay are controlled to be disconnected, and the pre-charging relay, the cathode relay and the third relay are controlled to be closed;
and after the pre-charging relay is closed for a certain time, controlling the positive relay to be closed and the pre-charging relay to be opened.
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