CN113581006B - Boost charging method and device and electric automobile - Google Patents

Boost charging method and device and electric automobile Download PDF

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Publication number
CN113581006B
CN113581006B CN202110989964.3A CN202110989964A CN113581006B CN 113581006 B CN113581006 B CN 113581006B CN 202110989964 A CN202110989964 A CN 202110989964A CN 113581006 B CN113581006 B CN 113581006B
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voltage
charging
battery pack
charging pile
current
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CN113581006A (en
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陈起武
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Guangzhou Zhipeng Manufacturing Co ltd
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Guangzhou Xiaopeng Smart Charge Technology Co 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention provides a boosting charging method and device and an electric vehicle, and relates to the technical field of electric vehicles, wherein the method comprises the following steps: acquiring insulation detection output voltage of a charging pile; under the condition that the insulation detection output voltage is not smaller than the highest allowable charging voltage, quick charging is carried out; and under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage, performing primary boost charging on the battery pack, or performing secondary boost charging on the battery pack. The invention reasonably utilizes the national standard charging standard flow, innovates a primary and a secondary boosting charging method, and realizes the automatic operation of boosting charging. The electric energy loss is reduced, the damage to equipment such as a motor controller, a motor and the like is reduced, and the service life of the equipment is prolonged. The charging suitability of the user is improved as a whole, differentiation and intellectualization of products are realized, and the market competitiveness of the electric automobile is improved.

Description

Boost charging method and device and electric automobile
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a boosting charging method and device and an electric vehicle.
Background
In order to improve the endurance mileage of the existing electric automobile, the capacity of a battery pack of the electric automobile is larger and larger, and the voltage level of the electric automobile is higher and higher. However, most of the current charging piles have low output voltage level and cannot well meet the charging requirement of the battery pack of the electric automobile.
Although there are schemes for charging a battery pack in a boost manner based on a motor controller and a motor, for example: the charging pile is 500V specification, and can charge for the battery pack with 750V voltage through the motor controller and the motor.
However, the current national standard charging standard flow is not matched with the corresponding standard flow, but rather, the boost charging can be realized by more complicated manual operation, the degree of automation is poor, and better experience can not be brought to users. In addition, in the charging process, the motor controller, the motor and a loop thereof are all participated in the whole process, so that not only is the loss of the electric energy output by the charging pile caused, but also the cost of a user is indirectly increased, and meanwhile, the damage of the motor controller, the motor and other equipment is caused to a certain extent, and the service life of the equipment is influenced.
Disclosure of Invention
In view of the foregoing, the present invention has been made to provide a boost charging method, apparatus, and electric vehicle that overcome or at least partially solve the foregoing problems.
In a first aspect, a method of boost charging is provided, the method comprising:
acquiring insulation detection output voltage of a charging pile;
under the condition that the insulation detection output voltage is not smaller than the highest allowable charging voltage of the battery pack, quick charging is carried out;
under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage, performing primary boost charging on the battery pack or performing secondary boost charging on the battery pack;
wherein, the first-stage boost charging is: charging the battery pack in a boosting mode from the beginning to the end of charging;
the secondary boost charge is: and charging the battery pack in a rapid charging mode from the beginning of charging to the preset voltage, and charging the battery pack in a boosting mode from the preset voltage to the ending of charging.
Optionally, performing primary boost charging on the battery pack or performing secondary boost charging on the battery pack includes:
under the condition that the current actual voltage of the battery pack is not smaller than the first voltage, carrying out the primary boost charging on the battery pack;
and carrying out the secondary boost charging on the battery pack under the condition that the current actual voltage is smaller than the first voltage.
Optionally, performing the first-stage boost charging on the battery pack includes:
transmitting the voltage of the battery pack to the charging pile as the first voltage;
enabling a motor controller to control a motor to discharge the battery pack, and reducing the voltage of a charging port of a vehicle end to the first voltage;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
and according to the magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage, the battery pack is charged in a boosting mode by different voltages and currents.
Optionally, according to the magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage, the battery pack is charged in a boosting manner with different voltages and currents, including:
and under the condition that the maximum output voltage of the charging pile is smaller than the insulation detection output voltage, requesting the charging pile to take the first voltage as the output voltage and the first current as the output current thereof, transmitting electric energy to the motor high-voltage loop, and simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage and requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
Optionally, according to the magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage, the battery pack is charged in a boosting manner with different voltages and currents, and the method further includes:
and under the condition that the maximum output voltage of the charging pile is not smaller than the insulation detection output voltage, requesting the output voltage of the charging pile to slowly rise from the first voltage to the second voltage, taking the second voltage as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
Optionally, performing the secondary boost charging on the battery pack includes:
transmitting the current actual voltage to the charging pile;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
The output loop of the charging pile is controlled to be communicated with the charging loop of the battery pack;
requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, and taking the charging demand current of the battery pack as the output current of the charging pile to directly charge the battery pack;
requesting the charging pile to suspend outputting voltage and current in a case that the voltage of the battery pack is charged to the preset voltage;
controlling the output loop of the charging pile to be disconnected with the charging loop of the battery pack;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
and requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
Optionally, the value of the first voltage is: the insulation detection output voltage is different from the first calibration voltage;
The value of the second voltage is: the difference value between the maximum output voltage of the charging pile and the first calibration voltage;
the value of the preset voltage is; the difference value between the maximum output voltage of the charging pile and the second calibration voltage;
the value of the first current is: taking the power obtained by taking the output power of the charging pile and the charging demand power of the battery pack as divisors and taking the first voltage as divisors to obtain a value obtained by dividing the output power of the charging pile and the charging demand power of the battery pack;
the value of the second current is: taking the output power of the charging pile as a divisor, and taking the actual voltage of the battery pack in the charging process as a divisor, and performing division operation on the divisor and the actual voltage to obtain a value;
the value of the third current is: and taking the charging demand power of the battery pack as a dividend, and taking the first voltage as a divisor, and performing division operation on the divisor and the first voltage to obtain a value.
Optionally, the method further comprises:
if the insulation detection output voltage is not greater than the minimum limit voltage and the insulation detection output voltage is less than the maximum allowable charging voltage, setting the insulation detection output voltage to be the minimum limit voltage in the process of performing primary boost charging on the battery pack, wherein at this time, the value of the first voltage is as follows: a difference between the minimum limit voltage and the first calibration voltage;
The minimum limiting voltage is the output voltage which can be provided by the charging pile with the current minimum output voltage level.
In a second aspect, there is provided an apparatus for boost charging, the apparatus comprising:
the acquisition module is used for acquiring insulation detection output voltage of the charging pile;
the quick charging module is used for carrying out quick charging under the condition that the insulation detection output voltage is not smaller than the highest allowable charging voltage;
the boost charging module is used for carrying out primary boost charging on the battery pack or carrying out secondary boost charging on the battery pack under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage;
wherein, the first-stage boost charging is: charging the battery pack in a boosting mode from the beginning to the end of charging;
the secondary boost charge is: and charging the battery pack in a rapid charging mode from the beginning of charging to the preset voltage, and charging the battery pack in a boosting mode from the preset voltage to the ending of charging.
Optionally, the boost charging module includes:
a first-stage boosting sub-module, configured to perform the first-stage boosting charging on the battery pack when the current actual voltage of the battery pack is not less than the first voltage;
And the secondary boosting sub-module is used for carrying out secondary boosting charging on the battery pack under the condition that the current actual voltage is smaller than the first voltage.
Optionally, the primary boost sub-module is specifically configured to:
transmitting the voltage of the battery pack to the charging pile as the first voltage;
enabling a motor controller to control a motor to discharge the battery pack, and reducing the voltage of a charging port of a vehicle end to the first voltage;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
and under the condition that the maximum output voltage of the charging pile is smaller than the insulation detection output voltage, requesting the charging pile to take the first voltage as the output voltage and the first current as the output current thereof, transmitting electric energy to the motor high-voltage loop, and simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage and requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
And under the condition that the maximum output voltage of the charging pile is not smaller than the insulation detection output voltage, requesting the output voltage of the charging pile to slowly rise from the first voltage to the second voltage, taking the second voltage as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
Optionally, the secondary boost submodule is specifically configured to:
transmitting the current actual voltage to the charging pile;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
the output loop of the charging pile is controlled to be communicated with the charging loop of the battery pack;
requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, and taking the charging demand current of the battery pack as the output current of the charging pile to directly charge the battery pack;
Requesting the charging pile to suspend outputting voltage and current in a case that the voltage of the battery pack is charged to the preset voltage;
controlling the output loop of the charging pile to be disconnected with the charging loop of the battery pack;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
and requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
In a third aspect, there is provided an electric vehicle including: a battery management system;
the battery management system is configured to perform the method of boost charging as described in any one of the first aspects.
The embodiment of the application has the following advantages:
in the boosting charging method, a new self-adaptive boosting charging method is innovated on the basis of the current national standard charging standard flow. Firstly, according to the national standard charging standard flow, when the insulation detection of the charging pile is performed in the handshake stage, a BATTERY management system (BATTERY MANAGEMENT SYSTEM BMS) acquires the insulation detection output voltage of the charging pile.
And then the BMS can determine that the output voltage grade of the charging pile meets the voltage grade of the battery pack under the condition that the insulation detection output voltage is not less than the highest allowable charging voltage of the battery pack, so that the battery pack can be charged quickly without boosting, namely, the battery pack can be charged commonly called quickly.
And under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage, the BMS can determine that the output voltage level of the charging pile cannot meet the voltage level of the battery pack, so that boost charging is needed, and finally, primary boost charging is carried out on the battery pack or secondary boost charging is carried out on the battery pack. Through such setting, the comparatively complicated manual operation in the present boost charging is avoided, but the boost charging is realized by BMS and charging pile automation, and the user only needs simple plug-in charging gun operation can, very big promotion user experience feel.
In addition, in the boost charging, the primary boost charging or the secondary boost charging is performed differently according to the actual situation. The first-stage boost charging means that the battery pack is charged in a boost manner from the start of charging to the end of charging; the second-stage boost charging means: the battery pack is charged in a rapid charging manner from the start of charging to the preset voltage, and the battery pack is charged in a boosting manner from the preset voltage to the end of charging. Namely, in the whole process of secondary boost charging, in the front stage charging process of increasing the voltage of the battery pack to the preset voltage, the participation of a motor controller, a motor and a loop thereof is not needed, and only in the process of ending charging from the preset voltage to the battery pack, the participation of the motor controller, the motor and the loop thereof is needed, so that the loss of the output electric energy of the charging pile is reduced to a certain extent, the cost of a user is indirectly reduced, the damage of the motor controller, the motor and other equipment is reduced to a certain extent, and the service life of the equipment is prolonged. The boosting charging method has higher practicability.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of a method of boost charging according to an embodiment of the present invention;
fig. 2 is a block diagram of an apparatus for boost charging according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a flowchart of a method of boost charging according to an embodiment of the present invention is shown, the method including:
step 101: and obtaining the insulation detection output voltage of the charging pile.
In the embodiment of the invention, according to the national standard charging standard flow, after a charging gun is inserted into a charging pile, a BMS of an electric automobile firstly sends a BMS handshake message, wherein the BMS handshake message comprises: the highest allowable charge voltage of the battery, for example: 800V, etc., after which the charging stake performs insulation detection according to standard procedures. When the charging pile performs insulation detection, an insulation detection voltage is used for insulation detection, wherein the insulation detection voltage may be the highest allowable charging voltage of the battery pack or the highest total charging voltage of the charging pile, and the insulation detection voltage is generally a voltage obtained by taking the two voltages. For example: a charging pile with 750V specification, wherein the highest allowable charging voltage of the battery pack is 800V, and then the insulation detection voltage of the charging pile is 750V; if a 500V-specification charging pile is used, the highest allowable charging voltage of the battery pack is 800V, and then the insulation detection voltage of the charging pile is 500V; if a charging pile with 750V specification is used, the highest allowable charging voltage of the battery pack is 500V, and then the insulation detection voltage of the charging pile is also 500V.
When charging the stake and carrying out insulation detection, BMS initiatively acquires the insulation detection output voltage who fills the stake, simultaneously, BMS can also acquire the current actual voltage of group battery, for example: although the voltage level of the battery pack is 800V or more, since the electric vehicle has been used for a long time, the current actual voltage is only 350V, and then the BMS acquires the current actual voltage of the battery pack as 350V; if the electric vehicle is used for only a short time, the current actual voltage is 780V, and the BMS obtains the current actual voltage of the battery pack to 780V.
Step 102: and carrying out quick charge under the condition that the insulation detection output voltage is not smaller than the highest allowable charge voltage of the battery pack.
In the embodiment of the invention, after the BMS obtains the insulation detection output voltage and the current actual voltage of the battery pack, the BMS needs to judge whether the insulation detection output voltage is smaller than the highest allowable charging voltage of the battery pack. The purpose of this is to determine whether boost charging is required or whether the battery pack can be charged directly and quickly.
If the BMS judges that the insulation detection output voltage is not less than the highest allowable charging voltage, the output voltage level corresponding to the charging pile completely meets the voltage level of the battery pack, and the battery pack can be directly and rapidly charged. For example: the insulation detection output voltage is 750V, and the highest allowable charging voltage is 500V, so that the charging pile can directly and rapidly charge the battery pack, namely, the participation of a motor controller motor and a circuit thereof is not needed, the charging pile voltage output circuit is communicated with the battery pack charging circuit, and the charging pile directly outputs electric energy to charge the battery pack. Of course, it is understood that if the insulation detection output voltage is 750V and the highest allowable charging voltage is 750V, the charging pile can also directly and rapidly charge the battery pack.
Step 103: under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage, performing primary boost charging on the battery pack, or performing secondary boost charging on the battery pack; wherein, the first-stage boost charging is: charging the battery pack in a boosting mode from the beginning of charging to the end of charging; the secondary boost charging is as follows: the battery pack is charged in a rapid charging manner from the start of charging to the preset voltage, and the battery pack is charged in a boosting manner from the preset voltage to the end of charging.
In the embodiment of the invention, if the insulation detection output voltage is smaller than the highest allowable charging voltage, which is equivalent to that the output voltage level of the charging pile cannot meet the voltage level of the battery pack, the battery pack is required to be charged through boost charging. For example: the insulation detection output voltage is 500V, and the highest allowable charging voltage is 750V, so that the charging pile cannot directly and rapidly charge the battery pack, and the battery pack needs to be charged through boost charging; if the insulation detection output voltage is 750V and the highest allowable charging voltage is 800V, the charging pile cannot directly and rapidly charge the battery pack, and the battery pack needs to be charged through boost charging.
In the embodiment of the invention, after the battery pack is determined to be subjected to boost charging, whether the battery pack is subjected to primary boost charging or secondary boost charging is determined according to the magnitude relation between the current actual voltage of the battery pack and the first voltage. The value of the first voltage is: the difference between the insulation detection output voltage and the first calibration voltage is a classical value that can be manually changed, which can be obtained and calibrated according to the actual requirements or a number of tests, for example: the first calibration value may be 50V or 20V, and assuming that the first calibration value may be 50V, the value of the first voltage is: (Uiso-50) V. The value of the insulation detection output voltage is denoted by Uiso in the following text.
The reason why the magnitude relation between the current actual voltage of the battery pack and the first voltage is determined is that, if the current actual voltage of the battery pack is not less than the first voltage, and because the voltage level of the battery pack is higher than the voltage level of the charging pile, the current actual voltage of the battery pack is very close to or higher than the maximum output voltage of the charging pile, and at this time, the battery pack is directly subjected to primary boost charging, but cannot be subjected to secondary boost charging.
If the current actual voltage of the battery pack is smaller than the first voltage and the voltage level of the battery pack is higher than the voltage level of the charging pile, the current actual voltage of the battery pack is lower than or far lower than the maximum output voltage of the charging pile, and in the charging process, the voltage of the battery pack is charged to the preset voltage first, and then the battery pack is charged in a boosting charging mode. In the embodiment of the invention, the preset voltage is the maximum output voltage close to the charging pile, and the value of the preset voltage is; the difference between the maximum output voltage of the charging pile and the second calibration voltage is assumed to be 20V, and then the value of the preset voltage is: (Ucml-20) V. The value of the maximum output voltage of the charging pile is expressed in the following text in Ucml.
If the current actual voltage of the battery pack is lower than or far lower than the maximum output voltage of the charging pile, the battery pack is directly subjected to primary boosting charging at the moment, so that the loss of the electric energy output by the charging pile can be caused in the process of charging from the current actual voltage to the preset voltage in the early stage due to the whole process participation of the motor controller, the motor and a loop of the motor, the cost of a user is indirectly increased, and meanwhile, the damage of equipment such as the motor controller and the motor is also caused to a certain extent, so that the service life of the equipment is influenced.
In the embodiment of the present invention, there is a special case, if the insulation detection output voltage is not greater than the minimum limit voltage and the insulation detection output voltage is less than the maximum allowable charging voltage, the insulation detection output voltage is set to the minimum limit voltage in the process of performing the primary boost charging on the battery pack, and at this time, the value of the first voltage is: the difference between the minimum limiting voltage and the first calibration voltage. The minimum limiting voltage is the output voltage provided by the charging pile with the current minimum output voltage level. At present, charging piles with the stock of 500V and even 450V specifications still exist on the market, and for the purpose of carrying out boost charging on a battery pack with high voltage level by the charging piles with the specifications, if the Uiso is less than or equal to 500V, the Uiso is set to be 500V in the process of carrying out primary boost charging on the battery pack.
In the embodiment of the invention, for primary boost charging, the specific steps include:
step S1: transmitting the voltage of the battery pack to the charging pile as a first voltage;
step S2: enabling a motor controller to control a motor to discharge the battery pack, and reducing the voltage of a charging port at the vehicle end to a first voltage;
step S3: the enabling motor controller connects the output loop of the charging pile with the motor high voltage loop.
In the embodiment of the invention, the BMS determines to perform primary boost charging on the battery pack, and firstly, the BMS sends the voltage of the battery pack to the charging pile as a first voltage: (Uiso-50) V; and then enabling the motor controller to control the motor to discharge the battery pack, and reducing the voltage of the charging port at the vehicle end to the first voltage. This is because, according to the national standard charging standard flow requirement, the charging pile needs to detect whether the voltage of the charging port of the vehicle end is matched with the voltage of the battery pack provided by the BMS when the charging flow enters into the vehicle end (BMS) to be ready, and the charging pile is allowed to charge after the matching. Therefore, the BMS sends the voltage of the battery pack to the charging pile to be the first voltage, and the voltage of the charging port at the vehicle end must also be the first voltage, so the BMS needs to enable the motor controller to control the motor to discharge the battery pack, and finally the charging port connected with the charging pile on the vehicle outputs a voltage, the magnitude of which is the same as the first voltage (in practice, the voltage is only required to be within the allowable error range of the first voltage due to factors such as components and control accuracy). It should be noted that, in general, the BMS enables the motor controller, and essentially the IPU (Intelligent Power Unit intelligent power unit) to perform various controls on the motor.
After the voltage of the charging port at the vehicle end is matched with the voltage of the battery pack provided by the BMS, the BMS can enable the motor controller to connect the output loop of the charging pile with the motor high-voltage loop so as to prepare for charging.
Step S4: receiving a feedback message from a charging pile;
step S5: extracting the maximum output voltage of the charging pile in the feedback message;
step S6: and according to the magnitude relation between the maximum output voltage and the insulation detection output voltage of the charging pile, the battery pack is charged in a boosting mode by different voltages and currents.
In the embodiment of the invention, after the output loop of the charging pile is connected with the motor high-voltage loop, the BMS receives a feedback message from the charging pile, the feedback message carries information of the maximum output voltage of the charging pile, and after the information is obtained, the BMS needs to charge the battery pack in a boosting mode by different voltages and currents according to the magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage. It should be noted that, the maximum output voltage of the charging pile should be generally the same as the highest total charging voltage of the charging pile, but in practical applications, the charging pile may generate a certain amount of voltage fluctuation due to factors such as components, external environment, design errors, and the like, and the fluctuation is still in an allowable range, but may still cause the maximum output voltage of the charging pile to be lower than the highest total charging voltage of the charging pile, or the maximum output voltage of the charging pile to be higher than the highest total charging voltage of the charging pile. The method specifically comprises the following steps:
In case that the maximum output voltage of the charging pile is smaller than the insulation detection output voltage, i.e., ucml < Uiso, the BMS requests the charging pile to have the first voltage: (Uiso-50) V is the output voltage thereof, the first current is used as the output current thereof, electric energy is transmitted to the motor high-voltage loop, meanwhile, the BMS requests the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage of the battery pack, requests the motor controller to control the output current of the motor high-voltage loop to be the second current, and finally, the battery pack is charged in a boosting mode by the highest allowable charging voltage and the second current.
In the embodiment of the invention, the value of the first current is: taking the power obtained after the output power of the charging pile and the charging demand power of the battery pack are taken as the dividend, and taking the first voltage: (Uiso-50) V is a divisor, and a value obtained by dividing the divisor by the divisor; the value of the second current is: and taking the output power of the charging pile as a divisor, and taking the actual voltage of the battery pack in the charging process as a divisor, and performing division operation on the divisor and the divisor to obtain the value. Therefore, when the charging is started, the actual voltage of the battery pack is lower, the second current is larger, the actual voltage of the battery pack is gradually increased along with the continuous progress of the charging, and the second current is also reduced along with the continuous progress of the charging until the charging is completed, and the second current is 0.
And under the condition that the maximum output voltage of the charging pile is larger than the insulation detection output voltage, namely, under the condition that Ucml is larger than or equal to Uiso, the BMS requests the output voltage of the charging pile to be equal to the first voltage: (Uiso-50) V is slowly raised to a second voltage, the second voltage is taken as an output voltage, a third current is taken as an output current, electric energy is transmitted to the motor high-voltage loop, meanwhile, the motor controller is requested to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, the motor controller is requested to control the output current of the motor high-voltage loop to be the second current, and finally, the battery pack is charged in a boosting mode according to the highest allowable charging voltage and the second current.
In the embodiment of the present invention, the value of the second voltage is: the difference value between the maximum output voltage of the charging pile and the first calibration voltage, namely, the value of the second voltage is: (Ucml-50) V. The process comprises the following steps: in case Ucml is not less than Uiso, BMS requests output voltage of charging pile from first voltage: (Uiso-50) V slowly rises to a second voltage: (Ucml-50) V at a second voltage: (Ucml-50) V is the output voltage, the third current is used as the output current, electric energy is transmitted to the motor high-voltage loop, meanwhile, the motor controller is requested to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, the motor controller is requested to control the output current of the motor high-voltage loop to be the second current, and finally, the battery pack is charged in a boosting mode according to the highest allowable charging voltage and the second current. Wherein the third current has a value of: taking the charging demand power of the battery pack as a dividend, and taking a first voltage: (Uiso-50) V is a divisor, and the divisor is a value obtained by dividing the divisor by the divisor.
The method for performing primary boost charging on the battery pack by the BMS is that the actual voltage of the battery pack at the start of charging is very close to or higher than the maximum output voltage of the charging pile although the motor controller, the motor and the loop thereof participate in the whole charging period, the battery pack is relatively short even if the battery pack is fully charged, the required electric energy is relatively less, the cost loss is relatively less, the damage to equipment is relatively light, and the primary boost charging method is selected for the condition that the actual voltage of the battery pack at the start of charging is very close to or higher than the maximum output voltage of the charging pile for the continuity of the charging process.
In the embodiment of the invention, different from the method of primary boost charging, for secondary boost charging, the specific steps include:
step T1: transmitting the current actual voltage to the charging pile;
step T2: receiving a feedback message from a charging pile;
step T3: extracting the maximum output voltage of the charging pile in the feedback message;
step T4: and the output loop of the control charging pile is communicated with the charging loop of the battery pack.
In the embodiment of the invention, the current actual voltage of the battery pack is lower than or far lower than the maximum output voltage of the charging pile, so that the BMS directly sends the current actual voltage of the battery pack to the charging pile, and the charging port voltage at the vehicle end is certainly the current actual voltage of the battery pack at the moment, so that the motor controller is not required to be enabled to control the motor to discharge the battery pack.
And then the BMS receives a feedback message from the charging pile, the feedback message carries the information of the maximum output voltage of the charging pile, and after the information is obtained, the BMS directly controls an output loop of the charging pile to be communicated with a charging loop of the battery pack.
Step T5: requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, and taking the charging demand current of the battery pack as the output current of the charging pile to directly charge the battery pack;
step T6: requesting the charging pile to suspend outputting the voltage and the current under the condition that the voltage of the battery pack is charged to a preset voltage;
step T7: the output loop of the charging pile is controlled to be disconnected with the charging loop of the battery pack;
step T8: enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
step T9: and the request charging pile takes the maximum output voltage of the charging pile as the output voltage, takes the third current as the output current, transmits electric energy to the motor high-voltage loop, and simultaneously requests the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requests the motor controller to control the output current of the motor high-voltage loop to be the second current, and finishes charging the battery pack in a boosting mode with the highest allowable charging voltage and the second current.
In the embodiment of the invention, the BMS directly controls the output loop of the charging pile to be communicated with the charging loop of the battery pack, so that when the charging pile directly charges the battery pack, the BMS requests the charging pile to take the maximum output voltage of the charging pile as the output voltage thereof and takes the charging demand current of the battery pack as the output current thereof, and the battery pack is rapidly charged. As the fast charge proceeds, the voltage of the battery pack increases.
After the voltage of the battery pack is charged to a preset voltage: in the case of (Ucml-20) V, when the actual voltage of the battery pack is very close to the maximum output voltage of the charging pile, intervention of boost charging is required to continue charging the battery pack until the battery pack is charged (for example, the battery pack reaches full charge). First, the BMS needs to request the charging post to suspend the output voltage and current, and then the BMS controls the output circuit of the charging post to be disconnected from the charging circuit of the battery pack. After disconnection, the BMS enables the motor controller to connect the output loop of the charging pile with the motor high-voltage loop in preparation for starting boost charging.
The BMS requests the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, takes the third current as the output current of the charging pile, transmits electric energy to the motor high-voltage loop, and simultaneously requests the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requests the motor controller to control the output current of the motor high-voltage loop to be the second current, and finishes charging the battery pack in a boosting mode with the highest allowable charging voltage and the second current. The voltage of the battery pack is continuously charged in a boost charging mode until the battery pack is charged.
For secondary boost charging, the whole charging time is longer, but the motor controller, the motor and a loop thereof are not needed to participate in the early charging process, so that the loss of the electric energy output by the charging pile and the damage of the motor controller, the motor and other equipment are avoided to a certain extent, the loss of the electric energy output by the charging pile is reduced in the whole, the cost of a user is indirectly reduced, the damage of the motor controller, the motor and other equipment is reduced to a certain extent, and the service life of the equipment is prolonged. In addition, the charging reliability and success rate are also increased by the mode, and if the motor controller or the motor of the electric automobile and the loop thereof have the problems of failure and the like, the battery pack can still be ensured to be charged to the maximum output voltage of the charging pile, so that the electric automobile can continue to run, a maintenance point can be found in time for maintenance, and the electric automobile is convenient for users.
In summary, by describing the boost charging method, the boost charging method reasonably utilizes the national standard charging standard flow, combines the actual situation, innovates the primary and secondary boost charging methods, realizes the automatic operation of boost charging, and does not need manual operation. After the charging gun is inserted into the charging pile, the high-platform charging pile and the low-platform charging pile are automatically identified, and then the high-platform charging pile is charged according to the common national standard charging standard flow, and the low-voltage platform performs primary and secondary boosting charging.
In the charging waiting and charging process, the boosting charging can be automatically started, and the boosting charging requirement can be dynamically identified in the charging process. When the motor controller or the motor and a loop thereof are in fault, after the boosting function is damaged, normal direct current charging can still be ensured, and the charging robustness is improved. The electric energy loss caused by energy conversion of the motor inverter is reduced, the cost of a user is indirectly reduced, meanwhile, the damage of equipment such as a motor controller and a motor is reduced to a certain extent, and the service life of the equipment is prolonged. The charging suitability of the user is improved as a whole, differentiation and intellectualization of products are realized, and the market competitiveness of the electric automobile is improved.
Based on the boosting charging method, the embodiment of the invention also provides a boosting charging device, referring to fig. 2, a block diagram of the boosting charging device according to the embodiment of the invention is shown, and the device includes:
an obtaining module 210, configured to obtain an insulation detection output voltage of the charging pile;
a fast charging module 220 for performing fast charging in the case that the insulation detection output voltage is not less than the highest allowable charging voltage;
A boost charging module 230, configured to perform primary boost charging on the battery pack or perform secondary boost charging on the battery pack when the insulation detection output voltage is less than the maximum allowable charging voltage;
wherein, the first-stage boost charging is: charging the battery pack in a boosting mode from the beginning to the end of charging;
the secondary boost charge is: and charging the battery pack in a rapid charging mode from the beginning of charging to the preset voltage, and charging the battery pack in a boosting mode from the preset voltage to the ending of charging.
Optionally, the boost charging module 230 includes:
a first-stage boosting sub-module, configured to perform the first-stage boosting charging on the battery pack when the current actual voltage of the battery pack is not less than the first voltage;
and the secondary boosting sub-module is used for carrying out secondary boosting charging on the battery pack under the condition that the current actual voltage is smaller than the first voltage.
Optionally, the primary boost sub-module is specifically configured to:
transmitting the voltage of the battery pack to the charging pile as the first voltage;
Enabling a motor controller to control a motor to discharge the battery pack, and reducing the voltage of a charging port of a vehicle end to the first voltage;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
and under the condition that the maximum output voltage of the charging pile is smaller than the insulation detection output voltage, requesting the charging pile to take the first voltage as the output voltage and the first current as the output current thereof, transmitting electric energy to the motor high-voltage loop, and simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage and requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
And under the condition that the maximum output voltage of the charging pile is not smaller than the insulation detection output voltage, requesting the output voltage of the charging pile to slowly rise from the first voltage to the second voltage, taking the second voltage as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
Optionally, the secondary boost submodule is specifically configured to:
transmitting the current actual voltage to the charging pile;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
the output loop of the charging pile is controlled to be communicated with the charging loop of the battery pack;
requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, and taking the charging demand current of the battery pack as the output current of the charging pile to directly charge the battery pack;
requesting the charging pile to suspend outputting voltage and current in a case that the voltage of the battery pack is charged to the preset voltage;
controlling the output loop of the charging pile to be disconnected with the charging loop of the battery pack;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
and requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
Based on the boosting charging method, the embodiment of the invention also provides an electric automobile, which comprises: a power battery management system for performing the boost charging method as described in any one of steps 101 to 103.
Through the embodiment, the boosting charging method reasonably utilizes the national standard charging flow based on the current national standard charging flow, and innovates the primary and secondary boosting charging methods by combining the actual conditions, thereby realizing the automatic operation of boosting charging without manual operation. When the charging pile insulation detection in the handshake stage, the BMS acquires the insulation detection output voltage of the charging pile, and under the condition that the insulation detection output voltage is not less than the highest allowable charging voltage, the charging pile can be directly charged quickly without boosting. In the case where the insulation detection output voltage is smaller than the highest allowable charging voltage, boost charging is required. After the charging gun is inserted into the charging pile, the high-platform charging pile and the low-platform charging pile are automatically identified, and then the high-platform charging pile is charged according to the common national standard charging standard flow, and the low-voltage platform performs primary and secondary boosting charging.
The secondary boost charging method can automatically start boost charging during waiting and charging, and can dynamically identify the boost charging requirement in the charging process. And when the motor controller or the motor and a loop thereof are in failure, after the boosting function is damaged, normal direct current charging can still be ensured, and the charging robustness is improved. The electric energy loss caused by energy conversion of the motor inverter is reduced, the cost of a user is reduced indirectly, meanwhile, the damage of equipment such as a motor controller and a motor is reduced to a certain extent, and the service life of the equipment is prolonged. The charging suitability of the user is improved as a whole, differentiation and intellectualization of products are realized, and the market competitiveness of the electric automobile is improved.
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. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The foregoing has described in detail the technical solutions provided by the embodiments of the present invention, and specific examples have been applied herein to illustrate the principles and embodiments of the present invention, and the above description of the embodiments is only for aiding in understanding the method of the present invention and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims (9)

1. A method of boost charging, the method comprising:
acquiring insulation detection output voltage of a charging pile;
under the condition that the insulation detection output voltage is not smaller than the highest allowable charging voltage of the battery pack, quick charging is carried out;
performing primary boost charging on the battery pack under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage and the current actual voltage of the battery pack is not smaller than a first voltage;
performing secondary boost charging on the battery pack when the insulation detection output voltage is less than the highest allowable charging voltage and the current actual voltage is less than the first voltage;
Wherein, the first-stage boost charging is: charging the battery pack in a boosting mode from the beginning to the end of charging;
performing the secondary boost charging of the battery pack, comprising:
the output loop of the charging pile is controlled to be communicated with the charging loop of the battery pack;
requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, and taking the charging demand current of the battery pack as the output current of the charging pile to directly charge the battery pack;
requesting the charging pile to suspend outputting voltage and current in case the voltage of the battery pack is charged to a preset voltage;
the output loop of the charging pile is controlled to be disconnected with the charging loop of the battery pack, and the motor controller is enabled to connect the output loop of the charging pile with the motor high-voltage loop;
and requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
2. The method of claim 1, wherein the primary boost charging the battery pack comprises:
transmitting the voltage of the battery pack to the charging pile as the first voltage;
enabling a motor controller to control a motor to discharge the battery pack, and reducing the voltage of a charging port of a vehicle end to the first voltage;
enabling the motor controller to connect an output loop of the charging pile with a motor high-voltage loop;
receiving a feedback message from the charging pile;
extracting the maximum output voltage of the charging pile in the feedback message;
and according to the magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage, the battery pack is charged in a boosting mode by different voltages and currents.
3. The method according to claim 2, wherein charging the battery pack in a boosting manner with different voltages, currents according to a magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage, comprises:
and under the condition that the maximum output voltage of the charging pile is smaller than the insulation detection output voltage, requesting the charging pile to take the first voltage as the output voltage and the first current as the output current thereof, transmitting electric energy to the motor high-voltage loop, and simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage and requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
4. The method according to claim 3, wherein the step-up charging of the battery pack is performed at different voltages and currents according to a magnitude relation between the maximum output voltage of the charging pile and the insulation detection output voltage, further comprising:
and under the condition that the maximum output voltage of the charging pile is not smaller than the insulation detection output voltage, requesting the output voltage of the charging pile to slowly rise from the first voltage to the second voltage, taking the second voltage as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, simultaneously requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
5. The method of claim 1, further comprising, prior to controlling the output circuit of the charging stake to communicate with the charging circuit of the battery pack:
transmitting the current actual voltage to the charging pile;
Receiving a feedback message from the charging pile;
and extracting the maximum output voltage of the charging pile in the feedback message.
6. The method of claim 4, wherein the first voltage has a value of: the insulation detection output voltage is different from the first calibration voltage;
the value of the second voltage is: the difference value between the maximum output voltage of the charging pile and the first calibration voltage;
the value of the preset voltage is; the difference value between the maximum output voltage of the charging pile and the second calibration voltage;
the value of the first current is: taking the power obtained by taking the output power of the charging pile and the charging demand power of the battery pack as divisors and taking the first voltage as divisors to obtain a value obtained by dividing the output power of the charging pile and the charging demand power of the battery pack;
the value of the second current is: taking the output power of the charging pile as a divisor, and taking the actual voltage of the battery pack in the charging process as a divisor, and performing division operation on the divisor and the actual voltage to obtain a value;
the value of the third current is: and taking the charging demand power of the battery pack as a dividend, and taking the first voltage as a divisor, and performing division operation on the divisor and the first voltage to obtain a value.
7. The method of claim 6, wherein the method further comprises:
If the insulation detection output voltage is not greater than the minimum limit voltage and the insulation detection output voltage is less than the maximum allowable charging voltage, setting the insulation detection output voltage to be the minimum limit voltage in the process of performing primary boost charging on the battery pack, wherein at this time, the value of the first voltage is as follows: a difference between the minimum limit voltage and the first calibration voltage;
the minimum limiting voltage is the output voltage which can be provided by the charging pile with the current minimum output voltage level.
8. A boost charging device, the device comprising:
the acquisition module is used for acquiring insulation detection output voltage of the charging pile;
the quick charging module is used for carrying out quick charging under the condition that the insulation detection output voltage is not smaller than the highest allowable charging voltage of the battery pack;
the boost charging module includes: the primary boosting sub-module is used for performing primary boosting charging on the battery pack under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage and the current actual voltage of the battery pack is not smaller than the first voltage; the secondary boosting submodule is used for performing secondary boosting charging on the battery pack under the condition that the insulation detection output voltage is smaller than the highest allowable charging voltage and the current actual voltage is smaller than the first voltage;
Wherein, the first-stage boost charging is: charging the battery pack in a boosting mode from the beginning to the end of charging;
the secondary boost submodule is specifically used for:
the output loop of the charging pile is controlled to be communicated with the charging loop of the battery pack;
requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage of the charging pile, and taking the charging demand current of the battery pack as the output current of the charging pile to directly charge the battery pack;
requesting the charging pile to suspend outputting voltage and current in case the voltage of the battery pack is charged to a preset voltage;
the output loop of the charging pile is controlled to be disconnected with the charging loop of the battery pack, and the motor controller is enabled to connect the output loop of the charging pile with the motor high-voltage loop;
and requesting the charging pile to take the maximum output voltage of the charging pile as the output voltage, taking the third current as the output current, transmitting electric energy to the motor high-voltage loop, requesting the motor controller to control the output voltage of the motor high-voltage loop to be the highest allowable charging voltage, requesting the motor controller to control the output current of the motor high-voltage loop to be the second current, and completing charging the battery pack in a boosting mode by taking the highest allowable charging voltage and the second current.
9. An electric automobile, characterized in that it comprises: a battery management system;
the battery management system is configured to perform the boost charging method as claimed in any one of claims 1 to 7.
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