CN108583305B - Charging precision diagnosis method, device and chip - Google Patents

Charging precision diagnosis method, device and chip Download PDF

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CN108583305B
CN108583305B CN201810195174.6A CN201810195174A CN108583305B CN 108583305 B CN108583305 B CN 108583305B CN 201810195174 A CN201810195174 A CN 201810195174A CN 108583305 B CN108583305 B CN 108583305B
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charging
value
current
current value
request
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CN108583305A (en
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冯路路
张凯
张彪
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • 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
    • 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
    • Y02T90/12—Electric charging stations

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a charging precision diagnosis method, a charging precision diagnosis device and a chip. The method comprises the following steps: the method comprises the steps of acquiring a current request value when a battery management system requests current for a charging pile at a specified charging stage in the charging process of a battery; acquiring a feedback current value output by the charging pile in response to a request of a battery management system; and calculating the output current precision value of the charging pile in the specified charging stage based on the request current value and the feedback current value. According to the charging precision diagnosis method, the charging precision diagnosis device and the charging precision diagnosis chip, the output current precision of the charging pile can be accurately judged in the battery charging process.

Description

Charging precision diagnosis method, device and chip
Technical Field
The invention relates to the field of power batteries, in particular to a charging precision diagnosis method, a charging precision diagnosis device and a charging precision diagnosis chip.
Background
Based on the energy conservation and environmental protection of the electric automobile, the electric automobile has become the development trend of the automobile industry instead of a fuel automobile, and the vehicle-mounted battery pack is used for storing and providing electric energy and is used as a core component of the electric automobile and is a power guarantee for normal running of the electric automobile.
In the process of charging the electric automobile by using the charging pile, the charging pile can communicate with a Battery Management System (BMS), and performs message interaction with the BMS, dynamically adjusts charging parameters according to data provided by the BMS, and completes the charging process of the charging Battery used by the electric automobile.
The high-precision charging pile can realize stable charging Of the electric automobile, improves the calculation precision Of the State Of Charge (SOC) Of the vehicle-mounted battery pack in the charging process, and automatically cuts off the power supply when the vehicle-mounted battery pack is fully charged, so that the problems Of overcharge Of the battery pack, over-high service life decay speed or inconsistency Of the battery pack and the like are avoided. However, the quality of most of the existing charging piles is uneven, and the accuracy of the charging pile cannot be accurately judged in the charging process.
Disclosure of Invention
The embodiment of the invention provides a charging precision diagnosis method, a charging precision diagnosis device and a charging precision diagnosis chip, which can accurately judge the output current precision of a charging pile in the process of charging a battery.
According to an aspect of an embodiment of the present invention, there is provided a charging accuracy diagnosis method including: the method comprises the steps of acquiring a current request value when a battery management system requests current for a charging pile at a specified charging stage in the charging process of a battery; acquiring a feedback current value output by a charging pile in response to a request of a battery management system; and calculating the output current precision value of the charging pile in the specified charging stage based on the request current value and the feedback current value.
According to another aspect of the embodiments of the present invention, there is provided a charging accuracy diagnosis device including: the system comprises a current value request acquisition module, a current value request acquisition module and a current value request acquisition module, wherein the current value request acquisition module is used for acquiring a current value request of a battery management system to a charging pile at a specified charging stage in the battery charging process; the feedback current value acquisition module is used for acquiring a feedback current value output by the charging pile in response to a request of the battery management system; and the precision value calculation module is used for calculating the output current precision value of the charging pile in the specified charging stage based on the request current value and the feedback current value.
According to still another aspect of the embodiments of the present invention, there is provided a charging accuracy diagnosis chip including: a memory and a processor; the memory is used for storing programs; the processor is configured to read executable program code stored in the memory to perform the charging accuracy diagnostic method described above.
According to the charging precision diagnosis method, the charging precision diagnosis device and the charging precision diagnosis chip, the precision of the output current of the charging pile can be accurately calculated according to the request current value of the battery management system and the feedback current value of the charging pile at different charging stages in the battery charging process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a charging accuracy diagnosis method according to an embodiment of the present invention;
fig. 2 is a detailed flowchart illustrating a charging accuracy diagnosis method according to some exemplary embodiments of the present disclosure;
fig. 3 is a detailed flowchart illustrating a charging accuracy diagnosis method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating a charging accuracy diagnosis apparatus provided according to an embodiment of the present invention;
fig. 5 is a schematic configuration diagram showing a charging accuracy diagnosis apparatus according to another embodiment of the present invention;
fig. 6 is a schematic diagram showing a hardware configuration of a charging accuracy calculation chip according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating an operation process of the charging accuracy diagnosis according to an exemplary embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is 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 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The rechargeable battery described in the embodiment of the present invention may be various types of storage units, and for example, the battery may be a lithium ion storage unit, a lead acid storage unit, a nickel-cadmium storage unit, a nickel-hydrogen storage unit, a lithium sulfur storage unit, or a sodium ion storage unit.
The battery in the embodiment of the present invention may be a battery, such as a lithium ion battery, in which both the positive electrode and the negative electrode can be taken out and can receive energy-carrying particles, and the battery is not limited herein. In terms of scale, the battery may be a single battery cell, or may be a battery module or a battery pack, which is not limited herein.
In the embodiment of the invention, an off-board conductive charger (hereinafter referred to as a charger or a charging pile) of an electric vehicle CAN be used for charging a vehicle-mounted rechargeable battery, and in the whole charging process, the BMS communicates with the charging pile through a Controller Area Network (CAN) communication protocol to monitor parameters such as charging voltage, charging current and battery temperature of the rechargeable battery and manage the whole charging process.
For ease of understanding, the process of charging the power battery by using the battery pile in the embodiment of the present invention is described below by way of an exemplary embodiment. It should be noted that these examples are not intended to limit the scope of the present disclosure.
In one embodiment, the process of charging the power battery by using the charging pile in the embodiment of the invention may include the following stages: the method comprises a physical connection stage, a low-voltage auxiliary electrification stage, a charging handshake stage, a charging parameter configuration stage, a charging stage and a charging ending stage. At each stage, the charging pile and the BMS inform the charging state of each other through the receiving and sending of messages.
In the physical connection completion stage in this embodiment, the charging gun of the charging pile is inserted into the charging interface of the vehicle to be charged, and the vehicle interface may have a locking function for the charging gun.
The low-voltage auxiliary power-up and charging handshake phase in this embodiment: fill electric pile and realize insulating detection, start to unload the high pressure of resistance when detecting insulating and unload to appointed magnitude of voltage for example below 60V to, fill the auxiliary power supply on the electric pile and for waiting the BMS power supply on the charging vehicle, make BMS begin work, fill and carry out data interaction and handshake between electric pile and the BMS.
The charging parameter configuration phase in this embodiment: the charging pile sends a message of the maximum output capacity to the BMS, and the BMS judges whether the charging pile can be used for charging according to the maximum output capacity of the charging pile. As an example, if the maximum output capability of the charging post is 60A current that can be output, when the BMS requests 50A current, it indicates that the existing maximum output capability of the charging post can satisfy the request of the BMS.
Charging phase in this embodiment: BMS and battery stake real-time communication send battery charging demand parameter to filling electric pile, fill electric pile and adjust output voltage and output current in real time according to the battery charging demand parameter that receives in order to ensure the normal clear of charging process to in charging process, fill electric pile and BMS and send respective status information each other.
As an example, the messages sent by the charging stage charging pile and the BMS in real-time interaction may include: battery charging demand messages (BCL), battery charging general status (BCS), Charger Charging Status (CCS), power storage battery status information (BSM), individual power storage battery voltage (BMV), power storage battery temperature (BMT), power storage battery reservation messages (BSP), BMS suspension charging (BST), charger suspension Charging (CST).
In this embodiment, in the end-of-charge phase: when the BMS reaches a full charge state or receives a charging pile termination charging message sent by the charging pile, determining that a charging termination condition is met, and sending a vehicle termination charging message by the BMS; and the charging pile reaches the charging end condition set by an operator, or receives a vehicle charging end message sent by the BMS, and controls the charging pile to stop charging.
The charging accuracy diagnosis method provided by the embodiment of the invention can be applied to the charging stage in the process of charging the power battery by using the charging pile described in the embodiment.
In one embodiment, the charging phase of the embodiment of the present invention can be divided into a constant current charging phase and a constant voltage charging phase. In the constant-current charging stage, the power battery is charged by constant charging current, the SOC of the power battery is gradually increased along with the charging, the charging voltage of the power battery is gradually increased until the charging voltage value of the power battery reaches a preset charging voltage threshold value in the constant-current charging stage, the constant-voltage charging stage is entered, and in the constant-voltage charging stage, after the charging voltage reaches a stable value, the charging current value can be reduced according to a certain rule.
In one embodiment, the constant current charging stage may include a plurality of constant current charging sub-stages, and the charging current value corresponding to the constant current charging sub-stage may decrease with the increase of the constant current charging sub-stage, and the charging current of each constant current charging sub-stage is kept constant during the charging process.
In one embodiment, the charging phase of the embodiment of the present invention may further include a battery equalization phase. The terminal voltage of the battery is unbalanced due to individual difference, temperature difference and the like in the using process of the power battery, and in order to avoid the deterioration of the unbalanced trend, the battery can be charged in a balanced manner when the power battery does not reach a full-charge state, so that the polarization phenomenon of the battery is avoided.
For a better understanding of the present invention, the charging accuracy diagnosis method according to the embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be noted that these embodiments are not intended to limit the scope of the present disclosure.
Fig. 1 is a flowchart illustrating a charging accuracy diagnosis method according to an embodiment of the present invention. As shown in fig. 1, the method 100 in an embodiment of the present invention includes the following steps:
step S110, acquiring a current request value when the battery management system requests current from the charging pile at a specified charging stage in the battery charging process.
In this step, as described in the above embodiment, the specified charging phase may include a constant current charging phase, a constant voltage charging phase, and a battery equalization phase.
In one embodiment, the designated charging phase may include only a constant current charging phase and a constant voltage charging phase, depending on the actual charging requirements and the settings of the charging process.
In one embodiment, in step S110, in a designated charging phase of the battery charging process, a requested current value when the battery management system requests the charging pile to reduce the current may be obtained.
And step S120, acquiring a feedback current value output by the charging pile in response to a request of the battery management system.
And step S130, calculating an output current precision value of the charging pile at the designated charging stage based on the request current value and the feedback current value.
According to the charging precision diagnosis method provided by the embodiment of the invention, the output current precision value of the charging pile at the specified charging stage can be calculated according to the request current value sent by the BMS and the feedback current value output by the charging pile, and the output current precision value is used as the diagnosis result of the charging precision, so that the precision of the charging pile can be accurately judged in the charging process.
Fig. 2 is a detailed flowchart illustrating a charging accuracy diagnosis method according to some exemplary embodiments of the present disclosure, and steps of fig. 2 that are the same as or equivalent to those of fig. 1 use the same reference numerals. As shown in fig. 2, in an embodiment, the step S120 may specifically include:
in step S121, the maximum output current of the charging pile and the charging mode of the charging pile are determined.
In this step, the charging modes of the charging piles may include a single charging mode and a group charging mode, where the single charging mode indicates that one charging pile is provided with one charging port, and only one vehicle can be charged by using the charging port; the group charging mode is that one charging pile is provided with a plurality of charging ports, and a plurality of vehicles can be charged simultaneously by utilizing the plurality of charging ports.
Since the phenomenon that the vehicle is still normally charged due to the fact that the BMS request is seriously mismatched with the output of the charging pile may occur under the condition that the vehicles are simultaneously charged, the charging precision diagnosis method of the embodiment of the invention is suitable for the BMS system and the charging pile in the single charging mode for the purposes of charging safety and accuracy of charging progress diagnosis.
In step S122, when the maximum output current of the charging pile is greater than or equal to the requested current value and the charging mode of the charging pile is the single charging mode, the requested current value sent when the battery management system requests current from the charging pile and the feedback current value output by the charging pile and corresponding to the requested current value are obtained.
In one embodiment, when the battery management system requests the charging pile to reduce the current, the current value of the request sent by the battery management system when the battery management system requests the charging pile to reduce the current is obtained.
In this step, the maximum output current of the charging pile is greater than or equal to the requested current value, which indicates that the existing maximum output capacity of the charging pile can meet the BMS requested capacity, thereby providing a data basis for the output current precision calculated in the charging precision diagnosis method.
As an example, when the designated charging stage is a constant current charging stage, the BMS requests the charging pile to have a current value greater than 30A; when the designated charging stage is a constant voltage charging stage or an equalization stage, the BMS requests the chargeable post to have a current value of less than 30A.
In one embodiment, in order to obtain a stable feedback current value, the feedback current value may be obtained after the charging pile reaches a preset output current delay time after receiving a current reduction request sent by the BMS, and the current precision may be calculated once each time the BMS sends a current reduction request and the charging pile output current reaches the delay time.
In this embodiment, in the charging phase, the BMS may send a charging demand parameter to the charging post in real time, request a current from the charging post, adjust the charging current to be consistent with a command value for a maximum time of T1 if a difference Δ I between the command value of the requested current and the current is less than or equal to 20A when the requested current decreases, and adjust Δ I when the difference Δ I is less than or equal to 20A>20A, the charging current may be adjusted to match the commanded value for a maximum time at T2. Here, T1 may be 1 second, for example, and T2 may be Δ I/DIminAnd wherein DIminA minimum charge rate may be indicated.
In this embodiment, in order to calculate the current accuracy when the charging current has been stabilized and adjusted to be consistent with the command value requested by the BMS, and to ensure the accuracy of the calculation, the output current delay time T may be set in advancedAfter the delay time, charge is obtainedFeedback current value output by the stake in response to the request of the BMS, and the preset output current delay time TdMay be equal to or greater than the maximum value of T1 and T2 in this embodiment.
In an embodiment, when the designated charging stage is a constant current charging stage, the step of calculating the output current accuracy of the charging post in step S130 may specifically include:
in step S131, the difference between the requested current value and the feedback current value is calculated.
Step S132, using the ratio of the difference value to the requested current value as the output current precision value of the feedback current value.
Specifically, when the charging phase is specified as the constant current charging phase, the output current precision value of the feedback current value may be calculated according to the following expression (1).
Figure GDA0002409176100000071
In the above expression (1), I1Current value of request indicating BMS request, I2And the feedback current value output by the charging pile in response to the BMS request is shown, and the a% represents the output current precision value of the charging pile calculated in the constant current charging stage.
In another embodiment, when the designated charging stage is a constant voltage charging stage or an equalization stage after the constant voltage charging stage, the step of calculating the output current precision value of the charging pile in step S130 may specifically include:
step S133 calculates a difference between the request current value and the feedback current value, and takes the difference as an output current precision value of the feedback current value.
Specifically, when the charge phase is specified as the constant-voltage charge phase or the equalization phase, the output current precision value of the feedback current value may be calculated according to the following expression (2).
b＝I1-I2(2)
In the above expression (2), I1Current value of request indicating BMS request, I2Reverse direction indicating output of charging pile according to BMS requestAnd the current feeding value b represents an output current precision value of the charging pile obtained by calculation in a constant voltage charging stage or an equalizing stage.
Fig. 3 is a detailed flowchart illustrating a charging accuracy diagnosis method according to another embodiment of the present invention, and the same reference numerals are used for the same or equivalent steps of fig. 3 as those of fig. 1. As shown in fig. 3, the charging accuracy diagnosis method 200 is substantially the same as the charging accuracy diagnosis method 100, except that the charging accuracy diagnosis method 200 further includes:
and step S140, judging whether the absolute value of the output current precision value exceeds a precision threshold value corresponding to the charging pile in the specified charging stage, and generating alarm information when the absolute value of the output current precision value exceeds the corresponding precision threshold value.
In one embodiment, when the designated charging stage is a constant current charging stage, the BMS requests a charging current I of 30A or more from the charging post1Charging pile outputting feedback current I2And calculating the current precision a% of the charging pile according to the expression (1).
In the embodiment, if the calculated current precision a% does not meet the charging pile feedback current standard in the constant current charging stage, such as | a | >1, that is, if a% exceeds the corresponding precision threshold range-1 ≦ a ≦ 1, then corresponding alarm information is generated according to the magnitude of | a |.
In this embodiment, in designating the charging phase as the constant current charging phase, the steps of steps S110 to S140 in the above embodiment may be repeated once after each stabilization of the current drop, and in the constant current charging phase, the request current I issued by the BMS1Are each equal to or greater than the request current threshold for the constant current charging phase, e.g., 30A.
In one embodiment, the BMS requests the charging post for a charging current I of less than 30A when the designated charging phase is a constant voltage charging phase or an equalization phase1Charging pile outputting feedback current I2And calculating the current precision b of the charging pile according to the expression (2).
In the embodiment, if the calculated current precision b does not meet the charging pile feedback current standard of a constant voltage charging stage or an equalizing stage, such as | b | >0.3, that is, if b exceeds the corresponding precision threshold range-0.3 ≦ b ≦ 0.3, then corresponding alarm information is generated according to the magnitude of | b |.
In this embodiment, in designating the charging stage as a constant voltage charging stage or an equalization stage, the steps of steps S110 to S140 in the above-described embodiment may be repeated once after each stabilization of the down current, and the request current I issued by the BMS in the constant voltage charging stage or the equalization stage1May be less than the requested current threshold for the constant current charging phase, e.g., 30A.
In one embodiment, the alarm information may include an alarm code for identifying a magnitude relationship between the request current value and the feedback current value, and the greater the difference between the request current value and the feedback current value, the higher the severity level.
As an example, if the feedback current value is greater than the requested current value, the alarm code indicates that the charging pile feedback current exceeds the limit; if the feedback current value is smaller than the request current value, the alarm code indicates that the feedback current of the charging pile is too small.
In this example, the constant current charging phase, if the requested current value is greater than the feedback current value, the alarm code may be 'the constant current phase current is too small'; the alarm code may be 'constant current phase current exceeds limit' if the requested current value is less than or equal to the feedback current value.
In this example, the constant voltage charging phase, if the requested current value is greater than the feedback current value, the alarm code may be 'the constant voltage phase current is too small'; the alarm code may be 'constant voltage stage current exceeds limit' if the requested current value is less than or equal to the feedback current value.
In this example, the equalization phase, if the requested current value is greater than the feedback current value, the alarm code may be 'equalization phase current too small'; the warning code may be 'equalization phase current exceeds limit' if the requested current value is less than or equal to the feedback current value.
In this embodiment, the problems that may be caused by charging piles, such as overcharging and poor battery consistency, are determined according to the alarm codes in different charging stages, and different instructions, such as sending an alarm signal, for example, an alarm sound signal or an alarm light signal, or controlling the charging pile to stop charging, can be sent to the charging pile according to the severity level of the alarm information.
According to the charging precision diagnosis method provided by the embodiment of the invention, the primary current precision can be calculated after the output current of the charging pile is delayed and ended when the current is reduced every time in the whole charging process of the BMS, the output current precision values of the charging pile in different charging stages can be accurately calculated according to the request current value of the BMS and the feedback current value of the charging pile, if the national standard is met, the charging can be continued, if the national standard is not met, the alarm severity grade is defined by the chip according to the value exceeding the national standard range, an alarm is given, a corresponding diagnosis result is given, the problems of overcharge of the battery pack, too high service life attenuation speed, inconsistency of the battery pack and the like are avoided, and the service life and the.
The charging accuracy diagnosis apparatus according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 4 is a schematic structural diagram illustrating a charging accuracy diagnosis apparatus according to an embodiment of the present invention. As shown in fig. 4, the charging accuracy diagnosis device 400 may include:
the requested current value obtaining module 410 is configured to obtain a requested current value when the battery management system requests current from the charging pile at a specified charging stage in a battery charging process.
In one embodiment, the requested current value obtaining module 410 is further configured to obtain a requested current value when the battery management system requests the charging pile to supply current in a specified charging phase of the battery charging process.
And the feedback current value is obtained after the charging pile receives the current reduction request and reaches the preset output current delay time.
A feedback current value obtaining module 420, configured to obtain a feedback current value output by the charging pile in response to a request of the battery management system;
and the precision value calculating module 430 is configured to calculate an output current precision value of the charging pile at the specified charging stage based on the requested current value and the feedback current value.
The charging precision diagnosis device provided by the embodiment of the invention can accurately judge the output current precision of the charging pile in the battery charging process.
In an embodiment, the feedback current value obtaining module 420 may specifically include:
the charging pile information acquisition unit is used for determining the maximum output current of the charging pile and the charging mode of the charging pile;
and the information acquisition condition determining unit is used for acquiring a request current value sent when the battery management system requests the charging pile for current and a feedback current value corresponding to the request current value output by the charging pile when the maximum output current of the charging pile is greater than or equal to the request current value and the charging mode of the charging pile is a single charging mode.
In one embodiment, the information obtaining condition determining unit is further configured to obtain a requested current value sent when the battery management system requests the charging pile to reduce the current and a feedback current value corresponding to the requested current value output by the charging pile when the maximum output current of the charging pile is greater than or equal to the requested current value and the charging mode of the charging pile is a single charging mode.
In an embodiment, when the designated charging stage is a constant current charging stage, the precision value calculating module 430 may specifically include:
a first difference value calculation unit for calculating a difference value between the request current value and the feedback current value; and the first precision value calculation unit is used for taking the ratio of the difference value to the request current value as the output current precision value of the feedback current value.
In another embodiment, when the designated charging phase is a constant voltage charging phase or an equalization phase after the constant voltage charging phase, the current precision value calculating module 430 may specifically include:
a second difference value calculating unit for calculating a difference value between the request current value and the feedback current value; and the second precision value calculation unit is used for taking the difference value as an output current precision value of the feedback current value.
Fig. 5 is a schematic structural diagram showing a charging accuracy diagnosis apparatus according to another embodiment of the present invention, and the same reference numerals are used for the same or equivalent structures in fig. 5 and 4. As shown in fig. 5, fig. 5 is substantially the same as fig. 4 except that the charging accuracy diagnosis apparatus 500 may further include:
and the alarm information generation module 440 is configured to determine whether the absolute value of the output current precision value exceeds a precision threshold corresponding to the charging pile in the specified charging stage, and generate alarm information when the absolute value of the output current precision value exceeds the corresponding precision threshold.
In one embodiment, the alarm information includes an alarm code for identifying a magnitude relationship between the request current value and the feedback current value, and the severity level is higher the larger the difference between the request current value and the feedback current value is.
In one embodiment, if the feedback current value is greater than the requested current value, the alarm code indicates that the feedback current of the charging pile exceeds the limit; if the feedback current value is smaller than the request current value, the alarm code indicates that the feedback current of the charging pile is too small.
According to the charging precision diagnosis device provided by the embodiment of the invention, the output current precision values of the charging piles at different charging stages can be accurately calculated, the alarm severity level can be defined and an alarm can be given when the output current precision values of the charging piles exceed the national standard range value, a corresponding diagnosis result is given, the problems of overcharge of the battery pack, over-high service life attenuation speed or inconsistency of the battery pack and the like are avoided, and the service life and the use safety of the battery pack are improved.
Other details of the charging accuracy diagnosis apparatus according to the embodiment of the present invention are similar to those of the charging accuracy diagnosis method according to the embodiment of the present invention described above with reference to fig. 1 to 5, and are not described again here.
Fig. 6 is a schematic diagram illustrating a hardware structure of a charging accuracy calculating chip according to an embodiment of the present invention.
As shown in fig. 6, the computing chip 600 includes an input device 601, an input interface 602, a central processor 603, a memory 604, an output interface 605, and an output device 606. The input interface 602, the central processing unit 603, the memory 604, and the output interface 605 are connected to each other via a bus 610, and the input device 601 and the output device 606 are connected to the bus 610 via the input interface 602 and the output interface 605, respectively, and further connected to other components of the computing device 600. Specifically, the input device 601 receives input information from the outside (e.g., charging pile output interface), and transmits the input information to the central processor 603 through the input interface 602; the central processor 603 processes input information based on computer-executable instructions stored in the memory 604 to generate output information, stores the output information temporarily or permanently in the memory 604, and then transmits the output information to the output device 606 through the output interface 605; output device 606 outputs output information to the exterior of computing device 600 for use by a user.
That is, the computing chip shown in fig. 6 may also be implemented to include: a memory storing computer-executable instructions; and a processor which, when executing computer executable instructions, may implement the charging accuracy diagnostic method and apparatus described in connection with fig. 1-5. Here, the processor in the chip may communicate with the battery management system and the current sensor mounted on the power battery to execute computer-executable instructions based on relevant information from the battery management system and/or the current sensor to implement the charging accuracy diagnosis method and apparatus described in connection with fig. 1-5
Fig. 7 shows an operational process diagram of the charging accuracy diagnosis according to an exemplary embodiment of the present invention. As shown in fig. 7, the BMS may send a message to the charging pile through the CAN communication interface for communication, and the charging pile may interact with the chip through the data interface.
In fig. 7, the operation of the charge accuracy diagnosis may include the following steps, for example
In step S01, the BMS sends a requested current value to the charging pile.
And step S02, the charging pile responds to the current request of the BMS and outputs a feedback current value.
In step S03, the chip obtains the requested current value and the feedback current value, and obtains a current precision value according to the charging precision diagnosis calculation in the above embodiment.
And step S04, in the appointed charging stage of the charging process, when the current precision does not meet the corresponding national standard, the chip judges the corresponding alarm code and the severity grade.
And step S05, the chip makes corresponding instructions for the battery according to the corresponding alarm codes and the severity levels, and the corresponding instructions comprise an alarm sending instruction for generating the charging pile or an execution instruction for the charging pile, such as an execution instruction for stopping charging and the like.
And step S06, the charging pile executes the received corresponding instruction according to the received corresponding instruction.
In the embodiment of the present invention, a computer program may be burned into the computing chip, and the charging accuracy diagnosis method in the above embodiment is executed by running and executing the computer program.
In another embodiment, the computing chip may be integrated into the processing system of the charging post and transmit data with the charging post via a data line.
In one embodiment, a reserved chip interface can be arranged on a pile body of a charging pile, before charging, a chip is inserted and successfully connected with the charging pile, after the charging pile and a BMS successfully complete physical connection, low-voltage auxiliary electrification, a charging handshake stage and a charging parameter configuration stage, messages in the charging stage are obtained, current precision is calculated according to interaction current of the charging pile and the BMS, current precision is calculated only once after the BMS reduces current every time in the whole charging process and the output current of the charging pile delays, if national standard is met, charging is continued, if the national standard is not met, the chip defines alarm severity grade by a value exceeding the national standard range and gives an alarm, and accurate diagnosis results and targeted processing measures are obtained.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product or computer-readable storage medium. The computer program product or computer-readable storage medium includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (10)

1. A charging accuracy diagnostic method characterized by comprising:
the method comprises the steps of acquiring a current request value when a battery management system requests current for a charging pile at a specified charging stage in the charging process of a battery;
acquiring a feedback current value output by the charging pile in response to a request of the battery management system;
calculating an output current precision value of the charging pile at the specified charging stage based on the request current value and the feedback current value; wherein the content of the first and second substances,
when the designated charging stage is a constant current charging stage, calculating an output current precision value of the charging pile in the designated charging stage based on the request current value and the feedback current value, including:
calculating a difference between the requested amperage and the feedback amperage;
taking the ratio of the difference value to the request current value as an output current precision value of the feedback current value;
when the designated charging stage is a constant voltage charging stage or an equalization stage after the constant voltage charging stage, calculating an output current precision value of the charging pile in the designated charging stage based on the requested current value and the feedback current value, including:
and calculating the difference value of the request current value and the feedback current value, and taking the difference value as the output current precision value of the feedback current value.
2. The charging accuracy diagnosis method according to claim 1, wherein the obtaining of the feedback current value output by the charging pile in response to the request of the battery management system includes:
determining the maximum output current of the charging pile and the charging mode of the charging pile;
and when the maximum output current of the charging pile is larger than or equal to the requested current value and the charging mode of the charging pile is a single charging mode, acquiring a requested current value sent by a battery management system when the battery management system requests current for the charging pile and a feedback current value output by the charging pile and corresponding to the requested current value.
3. The charging accuracy diagnostic method according to claim 1,
and the feedback current value is obtained after the charging pile receives a current request of the battery management system and reaches a preset output current delay time.
4. The charging accuracy diagnostic method according to claim 1, characterized by further comprising:
and judging whether the absolute value of the output current precision value exceeds a precision threshold value corresponding to the charging pile in the specified charging stage or not, and generating alarm information when the absolute value of the output current precision value exceeds the corresponding precision threshold value.
5. The charging accuracy diagnostic method according to claim 4,
the alarm information comprises an alarm code and a severity grade, the alarm code is used for identifying the magnitude relation between the request current value and the feedback current value, and the greater the difference value between the request current value and the feedback current value is, the higher the severity grade is.
6. A charging accuracy diagnostic device characterized by comprising:
the system comprises a current value request acquisition module, a current value request acquisition module and a current value request acquisition module, wherein the current value request acquisition module is used for acquiring a current value request of a battery management system to a charging pile at a specified charging stage in the battery charging process;
the feedback current value acquisition module is used for acquiring a feedback current value output by the charging pile in response to a request of the battery management system;
the precision value calculation module is used for calculating an output current precision value of the charging pile in the specified charging stage based on the request current value and the feedback current value; wherein the content of the first and second substances,
when the designated charging stage is a constant current charging stage, the precision value calculation module includes:
a first difference value calculation unit for calculating a difference value between the request current value and the feedback current value;
a first precision value calculation unit, configured to use a ratio of the difference value to the request current value as an output current precision value of the feedback current value;
when the appointed charging stage is a constant voltage charging stage or an equalization stage after the constant voltage charging stage, the current precision value calculation module comprises:
a second difference value calculation unit for calculating a difference value between the request current value and the feedback current value;
and the second precision value calculation unit is used for taking the difference value as an output current precision value of the feedback current value.
7. The charging accuracy diagnostic device according to claim 6, wherein the feedback current value acquisition module includes:
the charging pile information acquisition unit is used for determining the maximum output current of the charging pile and the charging mode of the charging pile;
and the information obtaining condition determining unit is used for obtaining a request current value sent by a battery management system when the current is requested to the charging pile and a feedback current value corresponding to the request current value output by the charging pile when the maximum output current of the charging pile is greater than or equal to the request current value and the charging mode of the charging pile is a single charging mode.
8. The charging-accuracy diagnostic device according to claim 6,
and the feedback current value is obtained after the charging pile receives a current request of the battery management system and reaches a preset output current delay time.
9. The charging accuracy diagnostic device according to claim 6, characterized by further comprising:
and the alarm information generation module is used for judging whether the absolute value of the output current precision value exceeds the precision threshold value corresponding to the charging pile in the specified charging stage or not, and generating alarm information when the absolute value of the output current precision value exceeds the corresponding precision threshold value.
10. A charging accuracy diagnosis chip is characterized by comprising a storage circuit and a processing circuit;
the storage circuit is used for storing executable program codes;
the processing circuit is configured to read executable program code stored in the storage circuit to execute the charging accuracy diagnosis method according to any one of claims 1 to 5.
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