CN111791749B - Pre-charging control method and device - Google Patents

Pre-charging control method and device Download PDF

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Publication number
CN111791749B
CN111791749B CN201910209246.2A CN201910209246A CN111791749B CN 111791749 B CN111791749 B CN 111791749B CN 201910209246 A CN201910209246 A CN 201910209246A CN 111791749 B CN111791749 B CN 111791749B
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charging
preset
battery system
load voltage
value
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CN111791749A (en
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陆珂伟
王林
张树梅
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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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
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • 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)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a pre-charging control method and a device, wherein the method is applied to a battery management system and comprises the following steps: acquiring operation information of a battery management system and a battery system; judging whether the operation information meets preset pre-charging permission conditions or not; if so, issuing a notice for representing permission of pre-charging to the battery system, and acquiring pre-charging current and load voltage of the battery system in the pre-charging process of the battery system based on the notice; judging whether the pre-charging current is equal to a preset pre-charging current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not; and if the pre-charging current is equal to the pre-charging current threshold and the load voltage is equal to the pre-load voltage threshold, controlling the pre-charging progress of the battery system according to the pre-charging duration. On the basis of the invention, the high-voltage hidden danger can be eliminated on the premise of ensuring the pre-charging time, and the safe starting of the electric automobile is ensured.

Description

Pre-charging control method and device
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a pre-charging control method and a pre-charging control device.
Background
With the popularization of electric vehicles, the effectiveness and safety of the precharge control of the battery system in the electric vehicle have been increasingly emphasized.
At present, the pre-charging control strategy mainly focuses on the problem of rationality of pre-charging time so as to complete the high-voltage power-on process of the whole vehicle within a set time. However, in order to meet the power and energy requirements of electric vehicles, the voltage platform of the whole vehicle is as high as hundreds of volts or even thousands of volts, and the high voltage safety problem should arouse enough attention of designers and users.
Therefore, how to eliminate the high voltage hidden trouble on the premise of ensuring the pre-charging time is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, to solve the above problems, the present invention provides a precharge control method and apparatus, and the technical solution is as follows:
a pre-charging control method is applied to a battery management system, and comprises the following steps:
acquiring operation information of the battery management system and the battery system;
judging whether the operation information meets preset pre-charging permission conditions or not;
if the operation information meets the preset pre-charging permission condition, issuing a first notice for representing permission of pre-charging to the battery system, and acquiring a pre-charging flow and a load voltage of the battery system in the pre-charging process of the battery system based on the first notice;
judging whether the pre-charging current is equal to a preset pre-charging current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not;
and if the pre-charging current is equal to the preset pre-charging current threshold and the load voltage is equal to the preset load voltage threshold, controlling the pre-charging progress of the battery system according to a preset pre-charging time length.
Preferably, the method further comprises:
and if the operation information does not meet the preset pre-charging permission condition, issuing a second notice for representing permission of pre-charging to the battery system.
Preferably, the method further comprises:
and if the pre-charging current is not equal to the preset pre-charging current threshold or the load voltage is not equal to the preset load voltage threshold, performing fault diagnosis on the battery system, and reporting a fault diagnosis result to the vehicle control unit.
Preferably, the performing the fault diagnosis on the battery system includes:
under the condition that the pre-charge current is larger than the preset pre-charge current threshold value and the load voltage is smaller than the preset load voltage threshold value, determining that the battery system has a fault that the load resistance is reduced or the battery system is short-circuited;
under the condition that the pre-charging current is larger than the preset pre-charging current threshold value and the load voltage is not smaller than the preset load voltage threshold value, determining that the battery system has the fault that the pre-charging resistance is smaller and the load capacitance is larger;
under the condition that the pre-charging current is smaller than the preset pre-charging current threshold value and the load voltage is not larger than the preset load voltage threshold value, determining that the battery system has a fault that the pre-charging resistance is increased, or the contact resistance of a pre-charging relay is increased, or the contact resistance of a main negative relay is increased, or the load capacitance is reduced;
under the condition that the pre-charging current is smaller than the preset pre-charging current threshold value and the load voltage is larger than the preset load voltage threshold value, determining that the battery system has a fault that the load is not connected or the capacitor is open;
determining that a fault of small pre-charge resistance exists in the battery system under the condition that the pre-charge current is equal to the pre-charge current threshold value and the load voltage is greater than the pre-load voltage threshold value;
and under the condition that the pre-charging current is equal to the preset pre-charging current threshold value and the load voltage is smaller than the preset load voltage threshold value, determining that the battery system has a fault that the pre-charging resistance is small.
Preferably, the method further comprises:
and under the condition that the battery system is determined to have the fault that the load resistance becomes small or the battery system is short-circuited, cutting off a high-voltage loop in the battery system.
Preferably, the preset precharge permission condition includes:
the controller hardware in the battery management system is in a normal state, the battery pack hardware in the battery system is in a normal state, the insulation resistance value of the battery pack in the battery system is within a preset high-voltage safety resistance value range, the residual electric quantity value of the battery pack is larger than a preset vehicle starting minimum electric quantity value, the estimated temperature value of the pre-charging resistor in the battery pack in the pre-charging process is larger than a preset maximum allowable temperature value, and the relay state of a high-voltage loop in the battery system is in any one or more of normal states.
Preferably, the estimation process of the estimated temperature value of the pre-charging resistor in the battery pack in the pre-charging process includes:
acquiring a voltage value of the battery pack, a capacitance value of a load in the battery pack, a resistance value of a pre-charging resistor in the battery pack and an initial temperature value of the pre-charging resistor;
calculating the voltage value of the load according to the voltage value of the battery pack, the capacitance value of the load, the resistance value of the pre-charging resistor and the preset pre-charging time;
calculating a pre-charging current value by using the voltage value of the load, the voltage value of the battery pack and the resistance value of the pre-charging resistor;
calculating a heat generation value of the pre-charging resistor according to the pre-charging current value, the resistance value of the pre-charging resistor and the preset pre-charging time;
calculating a temperature rise value of the pre-charging resistor based on the heat generation value of the pre-charging resistor, the preset specific heat capacity of the pre-charging resistor and the preset mass of the pre-charging resistor;
and calculating the estimated temperature value of the pre-charging resistor in the pre-charging process by using the initial temperature value of the pre-charging resistor and the temperature rise value.
Preferably, the controlling the pre-charging progress of the battery system according to the preset pre-charging duration includes:
judging whether the current pre-charging time of the battery system reaches the preset pre-charging time or not;
if the current pre-charging time does not reach the preset pre-charging time, returning to execute the pre-charging current and the load voltage of the battery system;
and if the current pre-charging time reaches the preset pre-charging time, sending a control instruction for representing stopping pre-charging to the battery system.
Preferably, the method further comprises:
and if the current pre-charging time does not reach the preset pre-charging time and the battery system is monitored to be in a pre-charging stop state, generating prompt information for representing the pre-charging failure of the battery system, and reporting the prompt information to the vehicle control unit.
A precharge control apparatus comprising:
the first acquisition module is used for acquiring the operation information of the battery management system and the battery system;
the first judgment module is used for judging whether the operation information meets a preset pre-charging permission condition or not; if the operation information meets the preset pre-charging permission condition, triggering a second acquisition module;
the second acquisition module is used for issuing a first notice for representing permission of pre-charging to the battery system and acquiring a pre-charging current and a load voltage of the battery system in the process of pre-charging the battery system based on the first notice;
the second judgment module is used for judging whether the pre-charging current is equal to a preset pre-charging current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not; triggering a control module if the pre-charge current is equal to the pre-charge current threshold and the load voltage is equal to the pre-load voltage threshold;
and the control module is used for controlling the pre-charging progress of the battery system according to the preset pre-charging duration.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a pre-charging control method and a pre-charging control device, which can allow the pre-charging of a battery system only when the operation information of the battery management system and the battery system meets the preset pre-charging permission condition, determine whether the pre-charging current and the load voltage meet the normal operation index by judging whether the pre-charging current is equal to the preset pre-charging current threshold value and whether the load voltage is equal to the preset load voltage threshold value in the pre-charging process of the battery system, and control the pre-charging progress of the battery system according to the preset pre-charging duration if the pre-charging current and the load voltage meet the normal operation index. On the basis of the invention, the high-voltage hidden danger can be eliminated on the premise of ensuring the pre-charging time, and the safe starting of the electric automobile is ensured.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of a method for controlling pre-charge according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating pre-charge resistor temperature estimation according to a pre-charge control method provided by an embodiment of the present invention;
FIG. 3 is a control flow chart of a precharge control method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a precharge control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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, 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.
The embodiment of the invention provides a pre-charging control method, which is applied to a battery management system, and the flow chart of the method is shown in figure 1, and the method comprises the following steps:
and S10, acquiring the operation information of the battery management system and the battery system.
In this embodiment, the operation information of the battery management system is used to represent the operation state of the battery management system, including but not limited to the operation state of controller hardware, such as a sampling circuit, an equalizing circuit, and the like. The operation information of the battery system is used for representing the operation state of the battery system, including but not limited to the operation state of the whole battery pack, the operation state of the pre-charging resistor in the battery pack and the operation state of the high-voltage loop in the battery pack.
S20, judging whether the operation information meets the preset pre-charging permission condition; if the operation information satisfies the preset precharge permission condition, step S30 is performed.
In this embodiment, the preset precharge permission condition includes any one or more of that the controller hardware in the battery management system is in a normal state, the battery pack hardware in the battery system is in a normal state, the insulation resistance value of the battery pack in the battery system is within a preset high-voltage safety resistance value range, the residual electric quantity value of the battery pack is greater than a preset minimum electric quantity value for starting the whole vehicle, the estimated temperature value of the precharge resistor in the battery pack in the precharge process is greater than a preset maximum allowable temperature value, and the relay state of the high-voltage loop in the battery system is in a normal state.
Specifically, if the controller hardware in the battery management system is in a normal state and the battery pack hardware in the battery system is in a normal state, the system has a fault condition for entering pre-charging. Of course, the controller hardware and the battery pack hardware may be classified according to the damage caused by the fault, for example, 5 fault classes, which means as follows:
level 0 fault — no fault; class 1 fault — mildest; level 2 fault-second minor; class 3 fault-slightly severe; class 4 fault — most severe. And when the fault level is 0, considering that the controller hardware and the battery pack hardware are both in a normal state, and otherwise, considering that the controller hardware and the battery pack hardware are in a fault state.
And if the insulation resistance value of the battery pack in the battery system is within the preset high-voltage safety resistance value range, the system has an insulation condition for entering pre-charging.
And if the SOC value of the residual electric quantity of the battery pack is greater than the preset minimum electric quantity value for starting the whole vehicle, the system has a power condition for entering pre-charging.
And if the estimated temperature value of the pre-charging resistor in the battery pack in the pre-charging process is greater than the preset maximum allowable temperature value, the system has a pre-charging temperature condition.
In the practical application process, the estimation process of the estimated temperature value of the pre-charging resistor in the battery pack in the pre-charging process includes the following steps, and the flow chart of the method is shown in fig. 2:
s201, acquiring a voltage value of the battery pack, a capacitance value of a load in the battery pack, a resistance value of a pre-charging resistor in the battery pack and an initial temperature value of the pre-charging resistor.
And S202, calculating the voltage value of the load according to the voltage value of the battery pack, the capacitance value of the load, the resistance value of the pre-charging resistor and the preset pre-charging time.
In the process of executing step S202, the voltage value of the load may be calculated according to the following formula (1):
UC＝UB(1-e-t/RC) (1)
wherein, UCIs the voltage value of the load, UBThe voltage value of the battery pack is represented as t, the preset pre-charging time is represented as t, R is the resistance value of the pre-charging resistor, and C is the capacitance value of the load.
And S203, calculating a pre-charging current value by using the voltage value of the load, the voltage value of the battery pack and the resistance value of the pre-charging resistor.
In the process of executing step S203, the precharge flow value may be calculated as following equation (2):
I＝(UB-UC)/R (2)
wherein, I is the pre-charging current value.
And S204, calculating the heat value of the pre-charging resistor according to the pre-charging current value, the resistance value of the pre-charging resistor and the preset pre-charging time.
In the process of executing step S204, the heat generation value of the pre-charge resistor may be calculated according to the following formula (3):
Q＝I2Rt (3)
wherein Q is the heat value of the pre-charging resistor.
S205, calculating a temperature rise value of the pre-charging resistor based on the heat generation value of the pre-charging resistor, the preset specific heat capacity of the pre-charging resistor and the preset mass of the pre-charging resistor.
In the process of executing step S205, the temperature increase value of the pre-charge resistor may be calculated according to the following formula (4):
ΔT＝Q/CRMR (4)
wherein, Delta T is the temperature rise value of the pre-charging resistor, CRFor a predetermined specific heat capacity of the pre-charging resistor, MRIs the preset quality of the pre-charging resistor.
S206, calculating the estimated temperature value of the pre-charging resistor in the pre-charging process by using the initial temperature value and the temperature rise value of the pre-charging resistor.
In the process of executing step S206, the estimated temperature value may be calculated according to the following formula (5):
TR＝TR0+ΔT (5)
wherein, TRFor estimating the temperature value, TR0The initial temperature value of the pre-charging resistor is obtained.
And if the relay state of the high-voltage loop in the battery system is in a normal state, the system has a relay condition for entering pre-charging. The relays of the high-voltage circuit include, but are not limited to, a pre-charge relay, a main positive relay, and a main negative relay. When the relay responds to the closing instruction and is in the closing state or responds to the opening instruction and is in the opening state, the relay state can be considered to be in the normal state.
And S30, sending a first notice for representing permission of pre-charging to the battery system, and acquiring the pre-charging current and the load voltage of the battery system in the process of pre-charging the battery system based on the first notice.
S40, judging whether the pre-charging current is equal to a preset pre-charging current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not; if the precharge current is equal to the preset precharge current threshold and the load voltage is equal to the preset load voltage threshold, step S50 is performed.
In this embodiment, the preset pre-charge current threshold and the preset load voltage threshold represent the normal operation indexes of the battery system respectively.
In addition, if the pre-charging current is not equal to the preset pre-charging current threshold or the load voltage is not equal to the preset load voltage threshold, fault diagnosis is carried out on the battery system, and a fault diagnosis result is reported to the vehicle control unit.
In practical applications, the fault diagnosis of the battery system may include the following cases:
(1) and if the pre-charging current is greater than the preset pre-charging current threshold value and the load voltage is less than the preset load voltage threshold value, determining that the battery system has the fault that the load resistance is reduced or the battery system is short-circuited. At the moment, the voltage of the battery pack is borne by the faults of the pre-charging points, so that the pre-charging current is too large, the heat productivity is increased sharply, and even the pre-charging resistor is burnt, thereby causing high-voltage safety accidents. At this time, a high-voltage loop in the battery system can be cut off, and a next step of instruction is waited after the fault diagnosis result is reported to the vehicle control unit, so that the safety of a high-voltage electrical system and a user is ensured.
(2) And if the pre-charging current is greater than the preset pre-charging current threshold and the load voltage is not less than the preset load voltage threshold, determining that the battery system has the fault that the pre-charging resistance becomes smaller and the load capacitance becomes larger. In order to protect the pre-charging resistor and the load, the fault diagnosis result is reported to the vehicle controller, then the next step of instruction is waited, and the high-voltage power-on is forbidden before the fault is eliminated.
(3) And if the pre-charging current is smaller than the preset pre-charging current threshold and the load voltage is not larger than the preset load voltage threshold, determining that the battery system has the fault that the pre-charging resistance is increased or the contact resistance of the pre-charging relay is increased or the contact resistance of the main negative relay is increased or the load capacitance is reduced. In order to protect the pre-charging resistor, the load and the relay, the fault diagnosis result is reported to the vehicle controller, then the next step of instruction is waited, and the high-voltage power-on is forbidden before the fault is eliminated.
(4) And if the pre-charging current is less than the preset pre-charging current threshold value and the load voltage is greater than the preset load voltage threshold value, determining that the battery system has the fault that the load is not connected or the capacitor is open. The open circuit makes the load resistance infinite, and the voltage of the battery pack is almost completely borne by the load, so that the false appearance of completing the pre-charging is caused. If the main positive relay and the main negative relay are then directly closed, and the load is just recovered to normal, the high-voltage loop will generate a very large current, causing damage to the load, the relays, and even the entire high-voltage loop. In order to protect the high-voltage loop and the load, the fault diagnosis result is reported to the vehicle controller, then the next step of instruction is waited, and the high-voltage power-on is forbidden before the fault is eliminated.
(5) And if the pre-charging current is equal to the preset pre-charging current threshold and the load voltage is greater than the preset load voltage threshold, determining that the battery system has a fault of small pre-charging resistance change. In order to protect the pre-charging resistor, the fault diagnosis result is reported to the vehicle control unit, then the next step of instruction is waited, and the high-voltage power-on is forbidden before the fault is eliminated.
(6) And if the pre-charging current is equal to the preset pre-charging current threshold and the load voltage is less than the preset load voltage threshold, determining that the battery system has a fault of small pre-charging resistance. In order to protect the pre-charging resistor, the fault diagnosis result is reported to the vehicle control unit, then the next step of instruction is waited, and the high-voltage power-on is forbidden before the fault is eliminated.
And S50, controlling the pre-charging progress of the battery system according to the preset pre-charging time length.
In the process of performing step S50, it may be determined whether the battery system completes precharging by determining whether the current precharging time period of the preset battery system reaches the preset precharging time period; if the current pre-charging time does not reach the preset pre-charging time, which indicates that the pre-charging of the battery system is not completed, the step S30 of "obtaining the pre-charging stream and the load voltage of the battery system" is executed; and if the current pre-charging time reaches the preset pre-charging time, indicating that the pre-charging of the battery system is completed, and sending a control instruction for representing the stopping of the pre-charging to the battery system. Certainly, in order to remind the user that the pre-charging is completed, prompt information used for representing the completion of the pre-charging can be generated at the same time and reported to the vehicle control unit, and the vehicle control unit broadcasts the prompt information on a large central control screen in a preset form.
In addition, in order to avoid stopping the pre-charging when the pre-charging of the battery system is not completed, when the current pre-charging time does not reach the preset pre-charging time and the battery system is monitored to be in a pre-charging stop state, prompt information for representing the pre-charging failure of the battery system is generated and reported to the vehicle control unit, and the vehicle control unit broadcasts the prompt information on a large central control screen in a preset form.
In some other embodiments, in order to prohibit the battery system from precharging when the preset precharging permission condition is not satisfied, on the basis of the precharging control method shown in fig. 1, the method further includes the following steps, and the flow chart of the method is shown in fig. 3:
and S60, if the operation information does not meet the preset precharging permission condition, sending a second notice for representing that precharging is forbidden to the battery system.
Certainly, in order to remind the user, prompt information for representing prohibition of pre-charging can be generated at the same time and reported to the vehicle controller, and the vehicle controller broadcasts the prompt information on the large central control screen in a preset form.
The pre-charging control method provided by the embodiment of the invention can allow the pre-charging of the battery system when the operation information of the battery management system and the battery system meets the preset pre-charging permission condition, and in the pre-charging process of the battery system, whether the pre-charging current is equal to the preset pre-charging current threshold value and whether the load voltage is equal to the preset load voltage threshold value are judged to determine whether the pre-charging current and the load voltage meet the normal operation index, and if so, the pre-charging progress of the battery system is controlled according to the preset pre-charging duration. On the basis of the method, the high-voltage hidden danger can be eliminated on the premise of ensuring the pre-charging time, and the safe starting of the electric automobile is ensured.
Based on the precharge control method provided in the foregoing embodiment, an embodiment of the present invention correspondingly provides an apparatus for performing the foregoing precharge control method, and a schematic structural diagram of the apparatus is shown in fig. 4, where the apparatus includes:
the first acquisition module 10 is used for acquiring the operation information of the battery management system and the battery system;
the first judging module 20 is configured to judge whether the operation information meets a preset precharge permission condition; if the operation information meets the preset pre-charging permission condition, triggering a second acquisition module;
the second obtaining module 30 is configured to issue a first notification indicating that precharging is permitted to the battery system, and obtain a precharge current and a load voltage of the battery system in a process of precharging the battery system based on the first notification;
a second determining module 40, configured to determine whether the pre-charge current is equal to a preset pre-charge current threshold and the load voltage is equal to a preset load voltage threshold; if the pre-charge current is equal to the pre-charge current threshold and the load voltage is equal to the pre-load voltage threshold, then the control module 50 is triggered;
and the control module 50 is configured to control the pre-charging progress of the battery system according to a preset pre-charging duration.
The pre-charging control device provided by the embodiment of the invention can eliminate high-voltage hidden danger on the premise of ensuring the pre-charging time, and ensures the safe starting of the electric automobile.
The precharge control method and apparatus provided by the present invention are described in detail above, and a specific example is applied in the present document to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A pre-charge control method is applied to a battery management system, and comprises the following steps:
acquiring operation information of the battery management system and the battery system;
judging whether the operation information meets preset pre-charging permission conditions or not;
if the operation information meets the preset pre-charging permission condition, issuing a first notice for representing permission of pre-charging to the battery system, and acquiring a pre-charging flow and a load voltage of the battery system in the pre-charging process of the battery system based on the first notice;
judging whether the pre-charging current is equal to a preset pre-charging current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not;
if the pre-charging current is equal to the pre-charging current threshold and the load voltage is equal to the pre-load voltage threshold, controlling the pre-charging progress of the battery system according to a preset pre-charging time;
wherein the method further comprises:
if the pre-charging current is not equal to the pre-charging current threshold or the load voltage is not equal to the pre-load voltage threshold, performing fault diagnosis on the battery system, and reporting a fault diagnosis result to the vehicle control unit;
the performing fault diagnosis on the battery system includes:
under the condition that the pre-charge current is larger than the preset pre-charge current threshold value and the load voltage is smaller than the preset load voltage threshold value, determining that the battery system has a fault that the load resistance is reduced or the battery system is short-circuited;
under the condition that the pre-charging current is larger than the preset pre-charging current threshold value and the load voltage is not smaller than the preset load voltage threshold value, determining that the battery system has the fault that the pre-charging resistance is smaller and the load capacitance is larger;
under the condition that the pre-charging current is smaller than the preset pre-charging current threshold value and the load voltage is not larger than the preset load voltage threshold value, determining that the battery system has a fault that the pre-charging resistance is increased, or the contact resistance of a pre-charging relay is increased, or the contact resistance of a main negative relay is increased, or the load capacitance is reduced;
under the condition that the pre-charging current is smaller than the preset pre-charging current threshold value and the load voltage is larger than the preset load voltage threshold value, determining that the battery system has a fault that the load is not connected or the capacitor is open;
determining that a fault of small pre-charge resistance exists in the battery system under the condition that the pre-charge current is equal to the pre-charge current threshold value and the load voltage is greater than the pre-load voltage threshold value;
and under the condition that the pre-charging current is equal to the preset pre-charging current threshold value and the load voltage is smaller than the preset load voltage threshold value, determining that the battery system has a fault that the pre-charging resistance is small.
2. The method of claim 1, further comprising:
and if the operation information does not meet the preset precharging permission condition, issuing a second notice for representing that precharging is forbidden to the battery system.
3. The method of claim 1, further comprising:
and under the condition that the battery system is determined to have the fault that the load resistance becomes small or the battery system is short-circuited, cutting off a high-voltage loop in the battery system.
4. The method of claim 1, wherein the preset precharge permission condition comprises:
the controller hardware in the battery management system is in a normal state, the battery pack hardware in the battery system is in a normal state, the insulation resistance value of the battery pack in the battery system is within a preset high-voltage safety resistance value range, the residual electric quantity value of the battery pack is larger than a preset vehicle starting minimum electric quantity value, the estimated temperature value of the pre-charging resistor in the battery pack in the pre-charging process is larger than a preset maximum allowable temperature value, and the relay state of a high-voltage loop in the battery system is in any one or more of normal states.
5. The method of claim 4, wherein estimating the estimated temperature of the pre-charge resistor in the battery pack during pre-charging comprises:
acquiring a voltage value of the battery pack, a capacitance value of a load in the battery pack, a resistance value of a pre-charging resistor in the battery pack and an initial temperature value of the pre-charging resistor;
calculating the voltage value of the load according to the voltage value of the battery pack, the capacitance value of the load, the resistance value of the pre-charging resistor and the preset pre-charging time;
calculating a pre-charging current value by using the voltage value of the load, the voltage value of the battery pack and the resistance value of the pre-charging resistor;
calculating a heat generation value of the pre-charging resistor according to the pre-charging current value, the resistance value of the pre-charging resistor and the preset pre-charging time;
calculating a temperature rise value of the pre-charging resistor based on the heat generation value of the pre-charging resistor, the preset specific heat capacity of the pre-charging resistor and the preset mass of the pre-charging resistor;
and calculating the estimated temperature value of the pre-charging resistor in the pre-charging process by using the initial temperature value of the pre-charging resistor and the temperature rise value.
6. The method of claim 1, wherein the controlling the pre-charge progress of the battery system according to a preset pre-charge time period comprises:
judging whether the current pre-charging time of the battery system reaches the preset pre-charging time or not;
if the current pre-charging time does not reach the preset pre-charging time, returning to execute the pre-charging current and the load voltage of the battery system;
and if the current pre-charging time reaches the preset pre-charging time, sending a control instruction for representing stopping pre-charging to the battery system.
7. The method of claim 6, further comprising:
and if the current pre-charging time does not reach the preset pre-charging time and the battery system is monitored to be in a pre-charging stop state, generating prompt information for representing the pre-charging failure of the battery system, and reporting the prompt information to the vehicle control unit.
8. A precharge control apparatus, comprising:
the first acquisition module is used for acquiring the operation information of the battery management system and the battery system;
the first judgment module is used for judging whether the operation information meets a preset pre-charging permission condition or not; if the operation information meets the preset pre-charging permission condition, triggering a second acquisition module;
the second acquisition module is used for issuing a first notice for representing permission of pre-charging to the battery system and acquiring a pre-charging current and a load voltage of the battery system in the process of pre-charging the battery system based on the first notice;
the second judgment module is used for judging whether the pre-charging current is equal to a preset pre-charging current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not; triggering a control module if the pre-charge current is equal to the pre-charge current threshold and the load voltage is equal to the pre-load voltage threshold;
the control module is used for controlling the pre-charging progress of the battery system according to the preset pre-charging duration;
the second judging module is further configured to judge whether the precharge current is equal to a preset precharge current threshold value or not and whether the load voltage is equal to a preset load voltage threshold value or not; triggering a control module if the pre-charge current is not equal to the pre-charge current threshold or the load voltage is not equal to the pre-load voltage threshold;
the control module is further configured to perform fault diagnosis on the battery system and report a fault diagnosis result to the vehicle control unit, where performing fault diagnosis on the battery system includes:
under the condition that the pre-charge current is larger than the preset pre-charge current threshold value and the load voltage is smaller than the preset load voltage threshold value, determining that the battery system has a fault that the load resistance is reduced or the battery system is short-circuited;
under the condition that the pre-charging current is larger than the preset pre-charging current threshold value and the load voltage is not smaller than the preset load voltage threshold value, determining that the battery system has the fault that the pre-charging resistance is smaller and the load capacitance is larger;
under the condition that the pre-charging current is smaller than the preset pre-charging current threshold value and the load voltage is not larger than the preset load voltage threshold value, determining that the battery system has a fault that the pre-charging resistance is increased, or the contact resistance of a pre-charging relay is increased, or the contact resistance of a main negative relay is increased, or the load capacitance is reduced;
under the condition that the pre-charging current is smaller than the preset pre-charging current threshold value and the load voltage is larger than the preset load voltage threshold value, determining that the battery system has a fault that the load is not connected or the capacitor is open;
determining that a fault of small pre-charge resistance exists in the battery system under the condition that the pre-charge current is equal to the pre-charge current threshold value and the load voltage is greater than the pre-load voltage threshold value;
and under the condition that the pre-charging current is equal to the preset pre-charging current threshold value and the load voltage is smaller than the preset load voltage threshold value, determining that the battery system has a fault that the pre-charging resistance is small.
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