CN113581009A - Battery module charging and discharging circuit of electric automobile and control method and device thereof - Google Patents
Battery module charging and discharging circuit of electric automobile and control method and device thereof Download PDFInfo
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- CN113581009A CN113581009A CN202110672705.8A CN202110672705A CN113581009A CN 113581009 A CN113581009 A CN 113581009A CN 202110672705 A CN202110672705 A CN 202110672705A CN 113581009 A CN113581009 A CN 113581009A
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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
- B60L2270/00—Problem solutions or means not otherwise provided for
- B60L2270/20—Inrush current reduction, i.e. avoiding high currents when connecting the battery
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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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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of battery charging and discharging control, in particular to a charging and discharging circuit of a battery module of an electric automobile and a control method and device thereof. In the charging and discharging circuit package of the battery module of the electric automobile, a first charging and discharging branch, a second charging and discharging branch and a pre-charging branch are arranged in a battery unit; the first charge-discharge branch and the second charge-discharge branch are connected in parallel between the end A and the end B; the A end is connected with the anode connecting end; the end B is connected with the negative connecting end; one end of the pre-charging branch is connected with the end A, and the other end of the pre-charging branch is connected with the positive electrode of the second battery module. According to the invention, a pre-charging branch is arranged between the first charging and discharging branch and the second charging and discharging branch which are connected in parallel of the battery units, and by utilizing the pre-charging branch, the pre-charging high-voltage power-up operation of the first charging and discharging branch and the second charging and discharging branch can be realized, and the voltage balancing function between the first battery module and the second battery module can be realized, so that the power-up and power-down safety of the parallel battery pack is effectively ensured.
Description
Technical Field
The invention relates to the technical field of battery charging and discharging control, in particular to a charging and discharging circuit of a battery module of an electric automobile and a control method and device thereof.
Background
With the environmental protection policy and the requirement of national energy safety, electric vehicles have been greatly developed in recent years. Compared with the traditional fuel vehicle, the endurance mileage problem restricts the important reason of the market acceptance of the electric vehicle.
In order to solve the problem of endurance of the electric automobile, two development paths are mainly provided at present, wherein one development path is connected with more battery modules in series, so that the platform voltage of the whole automobile is improved, and the battery capacity of the whole automobile is increased; and secondly, the capacity of the battery of the whole vehicle is increased by adopting a parallel module, and the voltage of a platform of the whole vehicle is kept unchanged. The scheme has high requirements on finished automobile insulation and other parts, the high-voltage safety needs to be fully verified, and in addition, the improvement of the battery voltage can also cause the reduction of the stability of the interface of the anode material and the electrolyte, so that the increase of side reactions is caused, and the cycle performance of the lithium ion battery is seriously influenced. In the second scheme, due to the battery process and material difference, the battery can be damaged under severe conditions due to a large loop circuit caused by module differential pressure at the moment of sudden high voltage.
Therefore, how to realize the safe power-on and power-off functions of the battery module is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a charging and discharging circuit of a battery module of an electric automobile and a control method and a control device thereof, so as to realize the safe power-on and power-off functions of the battery module.
In order to achieve the above object, the embodiments of the present invention provide the following solutions:
in a first aspect, an embodiment of the present invention provides a battery module charge/discharge circuit for an electric vehicle, where the battery module charge/discharge circuit for an electric vehicle includes at least one battery unit;
a first charge-discharge branch, a second charge-discharge branch and a pre-charging branch are arranged in the battery unit;
a first main positive relay, a first battery module and a first main negative relay which are sequentially connected in series are arranged in the first charging and discharging branch;
a second main positive relay, a second battery module and a second main negative relay which are sequentially connected in series are arranged in the second charging and discharging branch;
a pre-charging relay and a pre-charging resistor which are connected in series are arranged in the pre-charging branch circuit;
the first charge-discharge branch and the second charge-discharge branch are connected between the end A and the end B in parallel; the end A is connected with the positive connecting end; the end B is connected with the negative connecting end;
one end of the pre-charging branch is connected with the end A, and the other end opposite to the end A is connected with the positive electrode of the second battery module.
In one possible embodiment, the battery unit further comprises a quick charge relay; and the quick charging power supply end is connected with the end A through the quick charging relay.
In a second aspect, an embodiment of the present invention provides a method for controlling a charge and discharge circuit of a battery module of an electric vehicle based on any one of the first aspects, where the method includes:
when a high-voltage electrifying instruction is received, the first main negative relay, the second main negative relay and the pre-charging relay are closed, and the second battery module is pre-charged;
if the voltages at the two ends of the second main positive relay are balanced, the first main positive relay is closed, and the first battery module is precharged;
and if the voltage of the positive electrode of the first battery module is balanced with the voltage of the positive electrode of the second battery module, closing the second main positive relay, and disconnecting the pre-charging relay to finish the high-voltage electrifying process of the battery unit.
In one possible embodiment, after the high-voltage power-up process of the battery unit is completed, the method further includes:
and when a high-voltage power-off instruction is received, the first main positive relay, the second main positive relay, the first main negative relay and the second main negative relay are disconnected, and the high-voltage power-off process of the battery unit is completed.
In one possible embodiment, the battery unit further comprises a quick charge relay; the quick charging power supply end is connected with the end A through a quick charging relay;
after the high voltage discharging process of the battery unit is completed, the method further comprises:
when a quick-charging high-voltage power-on instruction is received, the first main negative relay, the second main negative relay, the quick-charging relay and the pre-charging relay are closed, and the second battery module is pre-charged;
if the voltages at the two ends of the second main positive relay are balanced, closing the first main positive relay, and pre-charging the first battery module;
and if the voltage of the positive electrode of the first battery module is balanced with the voltage of the positive electrode of the second battery module, closing the second main positive relay, and disconnecting the pre-charging relay to finish the quick-charging high-voltage electrifying process of the battery unit.
In one possible embodiment, after the fast charge high voltage power-up process of the battery unit is completed, the method further includes:
and when a quick charge high-voltage power-down instruction is received, the quick charge relay, the first main positive relay, the second main positive relay, the first main negative relay and the second main negative relay are disconnected, and the quick charge high-voltage power-down process of the battery unit is completed.
In a possible embodiment, if the ratio of the voltage on the side close to the end a to the voltage on the side far from the end a in the second main positive relay is greater than a set proportion, the voltages on the two ends of the second main positive relay are determined to be balanced;
and if the absolute value of the difference between the positive voltage of the first battery module and the positive voltage of the second battery module is smaller than a set threshold, determining that the positive voltage of the first battery module is balanced with the positive voltage of the second battery module.
In a third aspect, an embodiment of the present invention provides a control device based on any one of the charge and discharge circuits of the battery module of the electric vehicle in the first aspect, where the device includes:
the first control module is used for closing the first main negative relay, the second main negative relay and the pre-charging relay when receiving a high-voltage electrifying instruction, and pre-charging the second battery module;
the second control module is used for closing the first main positive relay and pre-charging the first battery module when the voltages at the two ends of the second main positive relay are balanced;
and the third control module is used for closing the second main positive relay and disconnecting the pre-charging relay to finish the high-voltage electrifying process of the battery unit when the positive voltage of the first battery module is balanced with the positive voltage of the second battery module.
In a possible embodiment, the apparatus further comprises:
and the fourth control module is used for disconnecting the first main positive relay, the second main positive relay, the first main negative relay and the second main negative relay after the high-voltage power-on process of the battery unit is completed and when a high-voltage power-off instruction is received, so that the high-voltage power-off process of the battery unit is completed.
In one possible embodiment, the battery unit further comprises a quick charge relay; the quick charging power supply end is connected with the end A through a quick charging relay;
the device further comprises:
the fifth control module is used for closing the first main negative relay, the second main negative relay, the quick charge relay and the pre-charge relay to pre-charge the second battery module when a quick charge high-voltage power-up instruction is received after the high-voltage power-down process of the battery unit is completed;
the sixth control module is used for closing the first main positive relay and pre-charging the first battery module when voltages at two ends of the second main positive relay are balanced;
and the seventh control module is used for closing the second main positive relay and disconnecting the pre-charging relay to finish the quick-charging high-voltage electrifying process of the battery unit when the positive voltage of the first battery module is balanced with the positive voltage of the second battery module.
In a possible embodiment, the apparatus further comprises:
and the eighth control module is used for disconnecting the quick charge relay, the first main positive relay, the second main positive relay, the first main negative relay and the second main negative relay after completing the quick charge high-voltage power-up process of the battery unit and when receiving a quick charge high-voltage power-down instruction, and completing the quick charge high-voltage power-down process of the battery unit.
In a possible embodiment, the apparatus further comprises:
the first identification module is used for identifying that the voltages at the two ends of the second main positive relay are balanced when the ratio of the voltage at the side close to the end A to the voltage at the side far away from the end A in the second main positive relay is greater than a set proportion;
and the second determination module is used for determining that the positive voltage of the first battery module is balanced with the positive voltage of the second battery module when the absolute value of the difference between the positive voltage of the first battery module and the positive voltage of the second battery module is smaller than a set threshold value.
In a fourth aspect, an embodiment of the present invention provides a power on and power off control apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the control method described in the second aspect.
In a fifth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the control method described in the second aspect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, a pre-charging branch is arranged between the first charging and discharging branch and the second charging and discharging branch which are connected in parallel of the battery units, and by utilizing the pre-charging branch, the pre-charging high-voltage power-up operation of the first charging and discharging branch and the second charging and discharging branch can be realized, and the voltage balancing function between the first battery module and the second battery module can be realized, so that the power-up and power-down safety of the parallel battery pack is effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic connection diagram of a charging and discharging circuit of a battery module of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling a charge/discharge circuit of a battery module of an electric vehicle according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control device of a battery module charge and discharge circuit of an electric vehicle according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a schematic connection diagram of a battery module charge/discharge circuit of an electric vehicle according to an embodiment of the present invention, where the battery module charge/discharge circuit includes at least one battery unit.
A first charge-discharge branch, a second charge-discharge branch and a pre-charge branch are arranged in the battery unit.
The first charging and discharging branch is internally provided with a first main positive relay K1, a first battery module E1 and a first main negative relay K2 which are sequentially connected in series.
And a second main positive relay K3, a second battery module E2 and a second main negative relay K5 which are sequentially connected in series are arranged in the second charging and discharging branch. The pre-charging branch is provided with a pre-charging relay K4 and a pre-charging resistor R1 which are connected in series.
The first charge-discharge branch and the second charge-discharge branch are connected in parallel between the end A and the end B; the A end is connected with the anode connecting end; the end B is connected with the negative connecting end.
Specifically, in the circuit, the terminal a is connected to the positive electrode of the first battery module E1 through the first main positive relay K1, and the negative electrode of the first battery module E1 is connected to the terminal B through the first main negative relay K2; the terminal a is connected to the positive electrode of the second battery module E2 through the second main positive relay K3, and the negative electrode of the second battery module E2 is connected to the terminal B through the second main negative relay K5.
One end of the pre-charging branch is connected to the terminal a, and the other end of the pre-charging branch is connected to the positive electrode of the second battery module E2.
Thus, the charging and discharging circuit of the battery module of the electric automobile can have the following working modes:
when the first main positive relay K1, the first main negative relay K2, the second main positive relay K3 and the second main negative relay K5 are closed and the pre-charging relay K4 is disconnected, the charging and discharging circuit of the battery module of the electric automobile is in a normal high-voltage working state;
when the first main positive relay K1 and the second main positive relay K3 are disconnected and the pre-charging relay K4 and the second main negative relay K5 are closed, the battery module charging and discharging circuit of the electric automobile is in a pre-charging working state for the second battery module E2;
when the second main positive relay K3 is turned off and the pre-charge relay K4, the first main positive relay K1, the second main negative relay K5 and the second main negative relay K5 are closed, the electric vehicle battery module charging and discharging circuit is in a pre-charge working state for the first battery module E1.
Therefore, through the on-off control of the corresponding relay, one pre-charging branch can be utilized, the pre-charging high-voltage power-on operation of the first charging and discharging branch and the second charging and discharging branch can be realized, and the voltage balancing effect between the first battery module E1 and the second battery module E2 is also realized, so that the power-on and power-off safety of the parallel battery pack is effectively ensured.
In practical application, the battery unit further comprises a quick charge relay K6; and the quick charging power supply end is connected with the end A through a quick charging relay K6.
Therefore, the charging and discharging circuit of the battery module of the electric automobile can be additionally provided with the following working modes:
when the quick charge relay K6, the first main positive relay K1, the first main negative relay K2, the second main positive relay K3 and the second main negative relay K5 are closed, and the pre-charge relay K4 is disconnected, the charging and discharging circuit of the battery module of the electric automobile is in a normal high-voltage quick charge working state;
when the first main positive relay K1 and the second main positive relay K3 are disconnected and the quick charge relay K6, the pre-charge relay K4 and the second main negative relay K5 are closed, the charging and discharging circuit of the battery module of the electric automobile is in a pre-charging working state for the second battery module E2;
when the second main positive relay K3 is switched off and the quick charge relay K6, the pre-charge relay K4, the first main positive relay K1, the second main negative relay K5 and the second main negative relay K5 are switched on, the charging and discharging circuit of the battery module of the electric automobile is in a pre-charging working state for the first battery module E1.
Therefore, through the on-off control of the corresponding relay, one pre-charging branch can be utilized, the quick-charging high-voltage power-on operation of the first charging and discharging branch and the second charging and discharging branch can be realized, and the voltage balancing effect between the first battery module E1 and the second battery module E2 is also realized, so that the quick-charging power-on and power-off safety of the parallel battery pack is effectively ensured.
Based on the same inventive concept as the above circuit, an embodiment of the present invention further provides a method for controlling a charge/discharge circuit of a battery module of an electric vehicle, where the method is applied to a control terminal of the charge/discharge circuit of the battery module of the electric vehicle, and as shown in fig. 2, the method specifically includes steps 11 to 13.
And step 11, when a high-voltage electrifying command is received, closing the first main negative relay K2, the second main negative relay K5 and the pre-charging relay K4, and pre-charging the second battery module E2.
And step 12, if the voltages at the two ends of the second main positive relay K3 are balanced, closing the first main positive relay K1 and pre-charging the first battery module E1.
Specifically, if the ratio of the voltage (U3) on the side close to the a terminal to the voltage (U2) on the side far from the a terminal in the second main positive relay K3 is larger than a set ratio, it is determined that the voltages across the second main positive relay K3 are balanced. In practical applications, the set ratio can be flexibly set according to actual requirements, and in this embodiment, the set ratio is set to 0.95.
Specifically, if the voltages at the two ends of the second main positive relay K3 are balanced, it indicates that the pre-charging process of the second battery module E2 is completed.
And step 13, if the voltage of the positive electrode of the first battery module E1 is balanced with the voltage of the positive electrode of the second battery module E2, closing the second main positive relay K3, and opening the pre-charging relay K4 to complete the high-voltage electrifying process of the battery unit.
Specifically, if the absolute value of the difference between the positive electrode voltage (U1) of the first battery module E1 and the positive electrode voltage (U2) of the second battery module E2 is smaller than the set threshold, it is determined that the positive electrode voltage of the first battery module E1 and the positive electrode voltage of the second battery module E2 are balanced. In practical applications, the set threshold can be flexibly set according to actual requirements, and in this embodiment, the set threshold is set to 0.5V.
Specifically, if the positive electrode voltage of the first battery module E1 and the positive electrode voltage of the second battery module E2 are equalized, it is determined that the pre-charging process of the first battery module E1 is completed.
In this embodiment, one pre-charging branch is used, so that not only can the pre-charging high-voltage power-on operations of the first charging and discharging branch and the second charging and discharging branch be realized, but also the voltage balancing effect between the first battery module E1 and the second battery module E2 can be achieved, and therefore, the power-on and power-off safety of the parallel battery pack is effectively guaranteed.
After the high voltage power-on process of the battery unit is completed, when the high voltage power-off command is received, the first main positive relay K1, the second main positive relay K3, the first main negative relay K2 and the second main negative relay K5 may be turned off, and the high voltage power-off process of the battery unit is completed.
The battery unit of the charging and discharging circuit of the battery module of the electric automobile also comprises a quick charging relay K6; the fast charging power supply end is connected with the end a through the fast charging relay K6, so that after the high-voltage power-down process of the battery unit is completed, the embodiment can also provide a control scheme for fast charging high-voltage power-up and power-down, and the control scheme specifically comprises steps 21 to 23.
And step 21, when a high-voltage electrifying command is received, closing the first main negative relay K2, the second main negative relay K5 and the pre-charging relay K4, and pre-charging the second battery module E2.
In step 22, if the voltages at the two ends of the second main positive relay K3 are balanced, the first main positive relay K1 is closed, and the first battery module E1 is pre-charged.
Specifically, if the ratio of the voltage (U3) on the side close to the a terminal to the voltage (U2) on the side far from the a terminal in the second main positive relay K3 is larger than a set ratio, it is determined that the voltages across the second main positive relay K3 are balanced. In practical applications, the set ratio can be flexibly set according to actual requirements, and in this embodiment, the set ratio is set to 0.95.
Specifically, if the voltages at the two ends of the second main positive relay K3 are balanced, it indicates that the pre-charging process of the second battery module E2 is completed.
Step 23, if the voltage of the positive electrode of the first battery module E1 is balanced with the voltage of the positive electrode of the second battery module E2, the second main positive relay K3 is closed, and the pre-charging relay K4 is opened, thereby completing the high-voltage power-on process of the battery unit.
Specifically, if the absolute value of the difference between the positive electrode voltage (U1) of the first battery module E1 and the positive electrode voltage (U2) of the second battery module E2 is smaller than the set threshold, it is determined that the positive electrode voltage of the first battery module E1 and the positive electrode voltage of the second battery module E2 are balanced. In practical applications, the set threshold can be flexibly set according to actual requirements, and in this embodiment, the set threshold is set to 0.5V.
Specifically, if the positive electrode voltage of the first battery module E1 and the positive electrode voltage of the second battery module E2 are equalized, it is determined that the pre-charging process of the first battery module E1 is completed.
In this embodiment, one pre-charging branch is used, so that not only can the fast charging and high-voltage power-on operations of the first charging and discharging branch and the second charging and discharging branch be realized, but also the voltage balancing effect between the first battery module E1 and the second battery module E2 can be achieved, and therefore the fast charging and power-on and power-off safety of the parallel battery pack is effectively guaranteed.
After the quick-charging high-voltage power-up process of the battery unit is completed, when a quick-charging high-voltage power-down command is received, the quick-charging relay K6, the first main positive relay K1, the second main positive relay K3, the first main negative relay K2 and the second main negative relay K5 are disconnected, and the quick-charging high-voltage power-down process of the battery unit is completed.
Based on the same inventive concept as the method, an embodiment of the present invention further provides a control device for a charge and discharge circuit of a battery module of an electric vehicle, the method is applied to a control terminal of the charge and discharge circuit of the battery module of the electric vehicle, as shown in fig. 3, the device in an embodiment of the present invention includes:
the first control module 31 is used for closing the first main negative relay K2, the second main negative relay K5 and the pre-charging relay K4 and pre-charging the second battery module E2 when receiving a high-voltage power-on command;
the second control module 32 is used for closing the first main positive relay K1 and pre-charging the first battery module E1 when the voltages at the two ends of the second main positive relay K3 are balanced;
and the third control module 33 is configured to close the second main positive relay K3 and open the pre-charge relay K4 when the positive voltage of the first battery module E1 is balanced with the positive voltage of the second battery module E2, so as to complete a high-voltage power-on process of the battery unit.
In a possible embodiment, the apparatus further comprises:
and the fourth control module is used for disconnecting the first main positive relay K1, the second main positive relay K3, the first main negative relay K2 and the second main negative relay K5 when a high-voltage power-down command is received after the high-voltage power-up process of the battery unit is completed, and the high-voltage power-down process of the battery unit is completed.
In one possible embodiment, the battery unit further comprises a quick charge relay K6; the quick charging power supply end is connected with the end A through a quick charging relay K6;
the device further comprises:
the fifth control module is used for closing the first main negative relay K2, the second main negative relay K5, the quick charge relay K6 and the pre-charge relay K4 and pre-charging the second battery module E2 when a quick charge high voltage power-up command is received after the high voltage power-down process of the battery unit is completed;
the sixth control module is used for closing the first main positive relay K1 and pre-charging the first battery module E1 when the voltages at the two ends of the second main positive relay K3 are balanced;
and the seventh control module is used for closing the second main positive relay K3 and disconnecting the pre-charging relay K4 when the positive voltage of the first battery module E1 is balanced with the positive voltage of the second battery module E2, so that the quick-charging high-voltage electrifying process of the battery unit is completed.
In a possible embodiment, the apparatus further comprises:
and the eighth control module is used for disconnecting the quick charge relay K6, the first main positive relay K1, the second main positive relay K3, the first main negative relay K2 and the second main negative relay K5 when a quick charge high voltage power-down command is received after the quick charge high voltage power-up process of the battery unit is completed, and the quick charge high voltage power-down process of the battery unit is completed.
In a possible embodiment, the apparatus further comprises:
the first identification module is used for identifying the voltage balance of the two ends of the second main positive relay K3 when the ratio of the voltage of the side, close to the A end, to the voltage of the side, far away from the A end, in the second main positive relay K3 is larger than a set proportion;
and a second determination module configured to determine that the positive voltage of the first battery module E1 is balanced with the positive voltage of the second battery module E2 when an absolute value of a difference between the positive voltage of the first battery module E1 and the positive voltage of the second battery module E2 is less than a predetermined threshold value.
Based on the same inventive concept as the foregoing embodiment, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the steps of any of the foregoing control methods when executing the program.
Based on the same inventive concept as in the previous embodiments, embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the steps of any of the control methods described above.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
according to the embodiment of the invention, a pre-charging branch is arranged between the first charging and discharging branch and the second charging and discharging branch which are connected in parallel of the battery units, so that the pre-charging branch can be used for realizing the pre-charging high-voltage power-on operation of the first charging and discharging branch and the second charging and discharging branch, and the voltage balance function between the first battery module and the second battery module can be realized, thereby effectively ensuring the power-on and power-off safety of the parallel battery pack.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
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 battery module charging and discharging circuit of an electric automobile is characterized by comprising at least one battery unit;
a first charge-discharge branch, a second charge-discharge branch and a pre-charging branch are arranged in the battery unit;
a first main positive relay, a first battery module and a first main negative relay which are sequentially connected in series are arranged in the first charging and discharging branch;
a second main positive relay, a second battery module and a second main negative relay which are sequentially connected in series are arranged in the second charging and discharging branch;
a pre-charging relay and a pre-charging resistor which are connected in series are arranged in the pre-charging branch circuit;
the first charge-discharge branch and the second charge-discharge branch are connected between the end A and the end B in parallel; the end A is connected with the positive connecting end; the end B is connected with the negative connecting end;
one end of the pre-charging branch is connected with the end A, and the other end opposite to the end A is connected with the positive electrode of the second battery module.
2. The electric vehicle battery module charge-discharge circuit according to claim 1, wherein the battery unit further comprises a quick charge relay; and the quick charging power supply end is connected with the end A through the quick charging relay.
3. The control method of the electric vehicle battery module charging and discharging circuit based on the claim 1 is characterized by comprising the following steps:
when a high-voltage electrifying instruction is received, the first main negative relay, the second main negative relay and the pre-charging relay are closed, and the second battery module is pre-charged;
if the voltages at the two ends of the second main positive relay are balanced, the first main positive relay is closed, and the first battery module is precharged;
and if the voltage of the positive electrode of the first battery module is balanced with the voltage of the positive electrode of the second battery module, closing the second main positive relay, and disconnecting the pre-charging relay to finish the high-voltage electrifying process of the battery unit.
4. The control method of claim 3, wherein after the completion of the high-voltage power-up process of the battery cell, the method further comprises:
and when a high-voltage power-off instruction is received, the first main positive relay, the second main positive relay, the first main negative relay and the second main negative relay are disconnected, and the high-voltage power-off process of the battery unit is completed.
5. The control method according to claim 4, wherein the battery unit further includes a quick charge relay; the quick charging power supply end is connected with the end A through a quick charging relay;
after the high voltage discharging process of the battery unit is completed, the method further comprises:
when a quick-charging high-voltage power-on instruction is received, the first main negative relay, the second main negative relay, the quick-charging relay and the pre-charging relay are closed, and the second battery module is pre-charged;
if the voltages at the two ends of the second main positive relay are balanced, closing the first main positive relay, and pre-charging the first battery module;
and if the voltage of the positive electrode of the first battery module is balanced with the voltage of the positive electrode of the second battery module, closing the second main positive relay, and disconnecting the pre-charging relay to finish the quick-charging high-voltage electrifying process of the battery unit.
6. The control method of claim 5, wherein after the completion of the fast charge high voltage power up process of the battery cell, the method further comprises:
and when a quick charge high-voltage power-down instruction is received, the quick charge relay, the first main positive relay, the second main positive relay, the first main negative relay and the second main negative relay are disconnected, and the quick charge high-voltage power-down process of the battery unit is completed.
7. The control method according to any one of claims 3 to 6, characterized in that if the ratio of the voltage on the side close to the A end to the voltage on the side far from the A end in the second main positive relay is greater than a set proportion, the voltages on the two ends of the second main positive relay are determined to be balanced;
and if the absolute value of the difference between the positive voltage of the first battery module and the positive voltage of the second battery module is smaller than a set threshold, determining that the positive voltage of the first battery module is balanced with the positive voltage of the second battery module.
8. The control device for the battery module charging and discharging circuit of the electric automobile according to claim 1, wherein the device comprises:
the first control module is used for closing the first main negative relay, the second main negative relay and the pre-charging relay when receiving a high-voltage electrifying instruction, and pre-charging the second battery module;
the second control module is used for closing the first main positive relay and pre-charging the first battery module when the voltages at the two ends of the second main positive relay are balanced;
and the third control module is used for closing the second main positive relay and disconnecting the pre-charging relay to finish the high-voltage electrifying process of the battery unit when the positive voltage of the first battery module is balanced with the positive voltage of the second battery module.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for executing the computer program to carry out the steps of the method of any one of claims 3 to 7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 3 to 7.
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| CN202110672705.8A CN113581009A (en) | 2021-06-17 | 2021-06-17 | Battery module charging and discharging circuit of electric automobile and control method and device thereof |
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