CN116852992A - Electric automobile low-voltage storage battery electricity supplementing method - Google Patents

Electric automobile low-voltage storage battery electricity supplementing method Download PDF

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Publication number
CN116852992A
CN116852992A CN202310604423.3A CN202310604423A CN116852992A CN 116852992 A CN116852992 A CN 116852992A CN 202310604423 A CN202310604423 A CN 202310604423A CN 116852992 A CN116852992 A CN 116852992A
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CN
China
Prior art keywords
voltage
power
battery
supplementing
low
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CN202310604423.3A
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Chinese (zh)
Inventor
李海牧
郁文通
魏广杰
付超
杨乐
杨琨明
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Jiangling Motors Corp Ltd
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Jiangling Motors Corp Ltd
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Priority to CN202310604423.3A priority Critical patent/CN116852992A/en
Publication of CN116852992A publication Critical patent/CN116852992A/en
Pending legal-status Critical Current

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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
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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

Abstract

The application provides a method for supplementing electricity to a low-voltage storage battery of an electric automobile, which comprises the steps of detecting and obtaining a high-voltage connection state of a power supplementing charging loop when an intelligent power supplementing function is started, and providing a high-voltage connection failure signal when the high-voltage connection state is abnormal; restarting the intelligent power supplementing function according to the high-voltage connection failure signal; obtaining high-voltage connection failure times according to the high-voltage connection failure signals, and disabling the intelligent power supply function when the high-voltage connection failure times exceed preset reference failure times. According to the method for supplementing the low-voltage storage battery of the electric automobile, provided by the application, in the intelligent power supplementing process of the low-voltage storage battery, the intelligent power supplementing function can be restarted when the abnormality occurs in response to the abnormality of the high-voltage connection state of the power supplementing charging circuit, the reliability of power supplementing execution is ensured, the use reliability of the electric automobile is ensured, and when the abnormal times exceed the safety range, the intelligent power supplementing function is disabled, so that the risk of safety problems in the power supplementing process can be effectively reduced, and the safety is improved.

Description

Electric automobile low-voltage storage battery electricity supplementing method
Technical Field
The application relates to the technical field of electric automobiles, in particular to a method for supplementing electricity to a low-voltage storage battery of an electric automobile.
Background
As a representative of new energy automobiles, electric automobiles have the advantages of economy, energy conservation, environmental protection and the like, and become the main stream development direction of the current society. Batteries for electric vehicles typically include a high voltage power battery pack (primarily for powering electric motors, abbreviated herein as power batteries) and a low voltage battery (typically 12V, primarily for powering meters, lighting, etc.). When the vehicle is in a non-starting state, the low-voltage storage battery provides power for the whole vehicle power utilization device, and when the vehicle is in a starting state, the power battery provides power for the whole vehicle and simultaneously charges the low-voltage storage battery.
When the vehicle is in a non-starting state for a long time, the low-voltage storage battery can continuously provide power for the whole vehicle electric device, however, in the non-starting state, the electric quantity of the low-voltage storage battery cannot be supplemented, the low-voltage storage battery is easy to generate the phenomenon of power shortage due to long-time output loss, and when the phenomenon of power shortage occurs in the low-voltage storage battery, the vehicle is easy to be unable to start, and the use of the pure electric vehicle is seriously affected.
In order to solve the problem of reliability caused by low-voltage storage battery deficiency caused by long-term non-use of a pure electric vehicle, at present, when the electric quantity of the low-voltage storage battery is low, a part of functions of a system are awakened, a power battery is started to charge and supplement electricity for the low-voltage storage battery, wherein the output voltage of the power battery is high, under the condition that only the part of functions of the system are awakened, if the pure electric vehicle breaks down, when the output of the power battery is abnormal, the system is difficult to effectively treat, and safety accidents are easily caused.
Disclosure of Invention
Based on the above, the application aims to provide a method for supplementing electricity to the low-voltage storage battery of the electric vehicle, so as to realize fault protection of the low-voltage storage battery of the pure electric vehicle and improve the safety and reliability of the pure electric vehicle.
The application provides a method for supplementing electricity to a low-voltage storage battery of an electric automobile, which comprises the following steps:
after the whole vehicle is dormant, controlling the opening of an intelligent power supplementing function according to the state of the low-voltage storage battery and the state of the whole vehicle;
when the intelligent power supply function is started, an effective power supply execution signal is provided for the whole vehicle controller so as to control the whole vehicle controller to execute an upper high-voltage flow, and a power supply charging loop is communicated with a power battery through the upper high-voltage flow so as to charge and supply power for the low-voltage storage battery through the power battery;
the step of executing the upper high-voltage flow by the whole vehicle controller further comprises the following steps:
after the upper high-voltage flow is finished, detecting and obtaining a high-voltage connection state of the head end of the power-supplementing charging circuit through the whole vehicle controller, and providing a high-voltage connection failure signal when the high-voltage connection state is abnormal;
acquiring high-voltage connection failure times according to the high-voltage connection failure signals, restarting the intelligent power supplementing function according to the high-voltage connection failure signals when the high-voltage connection failure times are smaller than or equal to preset reference failure times, and providing an effective power supplementing execution signal to a whole vehicle controller again so as to enable the whole vehicle controller to execute the upper high-voltage flow again; when the number of high-voltage connection failures is greater than the reference number of failures, disabling the intelligent power-up function, disabling the step of providing an effective power-up execution signal to the overall vehicle controller,
wherein, the abnormality of the high-voltage connection state includes: after the upper high-voltage process is completed, the power supplementing charging circuit fails to be communicated with the power battery, and the duration exceeds the first time.
Optionally, the first time is less than 10 seconds.
Optionally, the abnormality of the high-voltage connection state further includes:
and under the condition that the intelligent electricity supplementing function is started and the electricity supplementing charging circuit is communicated with the power battery, the electricity supplementing charging circuit is disconnected from the power battery.
Optionally, the reference number of failures is at least two.
Optionally, the step of controlling the opening of the intelligent power supplementing function according to the state of the low-voltage storage battery and the state of the whole vehicle comprises the following steps:
obtaining a power supply demand signal according to the state of the low-voltage storage battery;
when the electricity supplementing demand signal is effective, providing an electricity supplementing execution signal according to the whole vehicle state;
and when the power supply executing signal is effective, starting the intelligent power supply function.
Optionally, the step of obtaining the power supply demand signal according to the state of the low-voltage storage battery includes:
the low-voltage storage battery controller is awakened at regular time, so that the battery electricity quantity of the low-voltage storage battery is acquired and obtained at regular time according to the low-voltage storage battery controller;
and providing an effective power supply demand signal when the acquired battery power of the low-voltage storage battery is lower than a first reference power.
Optionally, the step of providing the power supply execution signal according to the whole vehicle state includes:
when the electricity supplementing demand signal is effective, waking up a vehicle body control system so as to acquire electricity supplementing function execution conditions according to the vehicle body control system;
providing an effective power-up execution signal when the power-up function execution condition is met;
and controlling the vehicle body control system to sleep when the power supply function execution condition is not met.
Optionally, the power up function execution condition includes: the hatch is in a closed state, the power battery is more than the third reference power, and the vehicle is not in other function control modes.
Optionally, the method further comprises: in the process of charging and supplementing the low-voltage storage battery by the power battery, the intelligent power supplementing function is controlled to be withdrawn according to the ending condition, wherein,
the end condition includes: the battery power of the low-voltage storage battery is larger than a second reference power, the hatch cover is opened, the power supplementing duration exceeds a second time, the communication message is lost, and the battery power of the power battery is lower than a fourth reference power;
and when at least one of the end conditions is met, the intelligent power supplementing function is exited, and the connection between the power battery and the low-voltage storage battery is disconnected.
Optionally, the process of charging and supplementing the low-voltage storage battery by the power battery further comprises:
and under the condition that the vehicle is switched into an upper function control mode, the intelligent power-on function is exited, and an upper high-voltage state of the whole vehicle controller is maintained, wherein the upper function control mode comprises a charging mode.
The method for supplementing electricity to the low-voltage storage battery of the electric automobile comprises the following steps: after the whole vehicle is dormant, controlling the opening of an intelligent power supplementing function according to the state of the low-voltage storage battery and the state of the whole vehicle; when the intelligent power supplementing function is started, an upper high-voltage flow is executed through the whole vehicle controller so as to communicate a power supplementing charging loop with a power battery, and the power battery is used for charging and supplementing power for the low-voltage storage battery; the step of executing the upper high-voltage flow through the whole vehicle controller further comprises the following steps: detecting and obtaining a high-voltage connection state of the power-supplementing charging circuit when the intelligent power-supplementing function is started, and providing a high-voltage connection failure signal when the high-voltage connection state is abnormal; acquiring high-voltage connection failure times according to the high-voltage connection failure signals, and restarting the intelligent power supplementing function according to the high-voltage connection failure signals when the high-voltage connection failure times are smaller than or equal to preset reference failure times so as to enable the whole vehicle controller to execute the upper high-voltage flow; and when the high-voltage connection failure times are larger than the reference failure times, disabling the intelligent power supply function. According to the method for supplementing the low-voltage storage battery of the electric automobile, in the intelligent power supplementing process of the low-voltage storage battery, the intelligent power supplementing function can be restarted when abnormality occurs in response to the abnormality of the high-voltage connection state of the power supplementing charging circuit, the reliability of power supplementing execution is improved, the use reliability of the electric automobile is improved, and when the abnormal times exceed the safety range, the intelligent power supplementing function is disabled, so that the risk of safety problems in the power supplementing process can be effectively reduced, and the safety is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for supplementing power to a low-voltage storage battery of an electric vehicle according to an embodiment of the application;
fig. 2 and fig. 3 are schematic views of a partial flow of a method for supplementing power to a low-voltage battery of an electric vehicle according to an embodiment of the application;
fig. 4 is a schematic diagram of a whole vehicle part module structure to which the method for supplementing power to the low-voltage storage battery of the electric vehicle according to the embodiment of the application is applied.
Description of main reference numerals: a low-voltage storage battery 10, a buck-direct current converter 11, a power battery 12 and a high-voltage connector 13.
The application will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Several embodiments of the application are presented in the figures. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 2 and fig. 3, a flow chart of a method for supplementing power to a low-voltage storage battery of an electric vehicle according to an embodiment of the application is shown, which mainly includes:
step S10: after the whole vehicle is dormant, the intelligent power supplementing function is controlled to be started according to the state of the low-voltage storage battery and the state of the whole vehicle.
Step S20: when the intelligent electricity supplementing function is started, an effective electricity supplementing executing signal is provided to the whole vehicle controller so as to control the whole vehicle controller to execute an upper high-voltage flow, and the electricity supplementing charging loop is communicated with the power battery through the upper high-voltage flow so as to charge and supplement electricity for the low-voltage storage battery through the power battery.
The step of executing the upper high-voltage flow by the whole vehicle controller further comprises the following steps:
step S21: after the upper high-voltage flow is finished, detecting and obtaining a high-voltage connection state of the head end of the electricity supplementing charging circuit through the whole vehicle controller, and providing a high-voltage connection failure signal when the high-voltage connection state is abnormal.
Step S22: acquiring high-voltage connection failure times according to the high-voltage connection failure signals, restarting the intelligent power supplementing function according to the high-voltage connection failure signals when the high-voltage connection failure times are smaller than or equal to preset reference failure times, and providing an effective power supplementing execution signal to a whole vehicle controller again so as to enable the whole vehicle controller to execute the upper high-voltage flow again; and when the high-voltage connection failure times are greater than the reference failure times, disabling the intelligent power supply function, and disabling the step of providing an effective power supply execution signal to the whole vehicle controller.
Wherein, the abnormality of the high-voltage connection state includes: after the upper high-voltage process is completed, the power supplementing charging circuit fails to be communicated with the power battery, and the duration exceeds the first time.
According to the method for supplementing the low-voltage storage battery of the electric automobile, after the high-voltage process is executed, the high-voltage connection state of the electric supplementing charging loop is directly detected, when the high-voltage connection state is abnormal and the power battery cannot be connected, high-voltage connection failure signal feedback is provided, the intelligent power supplementing function is restarted according to the high-voltage connection failure signal, when short-time interference abnormality occurs, the effective execution of charging and supplementing the low-voltage storage battery can be ensured, the reliability of supplementing the low-voltage storage battery is ensured, meanwhile, the high-voltage connection failure times are recorded according to the high-voltage connection failure signals, when the high-voltage connection failure times exceed the preset reference failure times, the potential safety hazard of the system can be judged, the intelligent power supplementing function is disabled, the output of the power battery is disconnected, the safety accident caused by abnormal output of the power battery is avoided, and the safety of the pure electric automobile is improved.
In this embodiment, the abnormality of the high-voltage connection state includes: under the condition that the intelligent electricity supplementing function is started, the electricity supplementing charging loop cannot be communicated with the power battery, and the duration exceeds a first time, and the first time is less than 10 seconds.
Specifically, for example, the first time is 5 seconds, when the intelligent power-supplementing function is started, whether the power battery is connected to the power-supplementing charging circuit is detected, and the power battery is placed in a high-voltage connection state, if the power battery is continuously not connected to the power battery by the power-supplementing charging circuit after the intelligent power-supplementing function is started, the power battery is continuously not in the high-voltage connection state, and the duration exceeds 5 seconds, a high-voltage connection failure signal feedback is provided, for example, the high-voltage connection failure signal is fed back to the vehicle body control system BCM, and meanwhile, the accumulated count of the times of the high-voltage connection failure is increased by one by the vehicle body control system BCM.
After the intelligent power supply function is restarted, the accumulated count of the high-voltage connection failure times is not cleared, and if the abnormal condition that the power battery is not connected for a long time by the power supply charging loop still occurs after the intelligent power supply function is restarted, the accumulated count of the high-voltage connection failure times is continued. And after the failure reason of the whole vehicle is normal, resetting the accumulated count of the high-voltage connection failure times.
In this embodiment, the abnormality of the high-voltage connection state further includes: and under the condition that the intelligent electricity supplementing function is started and the electricity supplementing charging circuit is communicated with the power battery, the electricity supplementing charging circuit is disconnected from the power battery.
Specifically, for example, after the intelligent power supplementing function is started or restarted, the power battery is connected to the power charging circuit within 5 seconds, the low-voltage storage battery is started to be subjected to power supplementing charging, in the power supplementing charging process, the connection state of the power battery and the power battery is abnormally disconnected, a high-voltage connection failure signal feedback is provided, and meanwhile, the accumulated count of the number of high-voltage connection failures is increased by one.
In this embodiment, the reference failure number is at least two.
Specifically, for example, the reference failure times are two times, in the first start, the first restart and the second restart of the intelligent power supply function, the power supply charging loop is continuously not communicated with the power battery, so that the accumulated count of the high-voltage connection failure times reaches three times, and exceeds the set number of times, the intelligent power supply function is disabled, the vehicle body control system BCM does not enter the intelligent power supply function any more, the wake-up of the whole vehicle controller VCU is not controlled to execute the high-voltage process, and the safety accident caused by the misoperation of the high-voltage power consumption under the abnormal condition is avoided.
The design of the first time can comprehensively consider factors such as the response delay of the system, the safety range of abnormal duration and the like so as to ensure the reliability of the power supply execution and fault protection of the low-voltage storage battery. For example, the first time is longer than the response delay of the system, so that false triggering of high-voltage connection failure caused by response delay is avoided; the first time is smaller than the safety range of the abnormal duration, the overlong acquisition response time of the high-voltage connection failure abnormality is avoided, and the safety accident occurs before the abnormality is confirmed and the forbidden protection is triggered.
Referring to fig. 4, a schematic block diagram of a whole vehicle part module to which the method for supplementing power to the low-voltage storage battery of the electric vehicle according to the embodiment of the application is applied is shown.
In this embodiment, the step of controlling the opening of the intelligent power supplementing function according to the state of the low-voltage storage battery and the state of the whole vehicle includes: obtaining a power supply demand signal according to the state of the low-voltage storage battery; when the electricity supplementing demand signal is effective, providing an electricity supplementing execution signal according to the whole vehicle state; step S16: and when the power supply executing signal is effective, starting the intelligent power supply function.
The low-voltage storage battery controller EBS is used for obtaining the power supply demand signal according to the state of the low-voltage storage battery; providing a power supply execution signal according to the whole vehicle state and completing the power supply execution signal by a vehicle body control system BCM; the power compensation execution corresponds to the high-voltage flow, is executed by the whole vehicle controller VCU, is executed in a grading way, and can reduce energy consumption.
In this embodiment, the step of obtaining the power supply demand signal according to the state of the low-voltage storage battery includes:
step S11: and waking up the low-voltage battery controller EBS at regular time to acquire the battery power SOC of the low-voltage battery 10 according to the low-voltage battery controller EBS at regular time.
Step S12: and when the acquired battery power SOC of the low-voltage storage battery 10 is lower than a first reference power, providing an effective power supplementing demand signal. The first reference charge amount is, for example, 15% of the rated charge amount of the low-voltage battery 10.
The step of providing the power compensation execution signal according to the whole vehicle state comprises the following steps:
step S13: and when the electricity supplementing demand signal is effective, waking up a vehicle body control system so as to acquire the electricity supplementing function execution condition according to the vehicle body control system.
Step S14: and when the power-up function execution condition is met, providing the effective power-up execution signal.
Step S15: and controlling the vehicle body control system to sleep when the power supply function execution condition is not met.
In this embodiment, the power up function execution condition includes: the cabin cover is in a closed state, the electric quantity of the power battery is larger than the third reference electric quantity, the vehicle is not in other function control modes and the like, wherein when all items in the electric supplementing function execution conditions are met, an effective electric supplementing execution signal is provided, and when any item in the electric supplementing function execution conditions is not met, the electric supplementing function is determined to be not in accordance with the execution conditions, and the vehicle body control system is controlled to sleep.
The third reference power is, for example, 45% of the rated power of the power battery 12, and may be adaptively designed according to specific situations, which is not particularly limited in the present application.
In this embodiment, further comprising: and in the process of charging and supplementing the low-voltage storage battery by the power battery, controlling the intelligent power supplementing function to exit according to the ending condition.
Wherein the end condition includes: the battery power of the low-voltage storage battery is larger than a second reference power, the hatch cover is opened, the power supplementing duration exceeds a second time, the communication message is lost, and the battery power of the power battery is lower than a fourth reference power; and when at least one of the end conditions is met, the intelligent power supplementing function is exited, and the connection between the power battery and the low-voltage storage battery is disconnected.
When the battery power of the low-voltage storage battery is larger than the second reference power, the low-voltage storage battery can be considered to be powered up; when the hatch cover is opened, the whole vehicle can be considered to be in a overhauling and maintenance state, and the output of the power battery is disconnected so as to ensure the safety of overhauling and maintenance personnel; when the power supplementing duration exceeds the second time, the low-voltage storage battery is considered to be failed, or the power supplementing charging circuit is considered to be failed, and the power supplementing should be stopped; when the communication message is lost, the low-voltage battery controller EBS, the vehicle body control system BCM, the vehicle control unit VCU and other systems are considered to be in fault, and the power supply is stopped, so that the safety problem is avoided; when the battery electric quantity of the power battery is lower than the fourth reference electric quantity, the residual electric quantity of the power battery is considered to be insufficient, the power supplementing charging is stopped, and the influence on the service life of the power battery due to the fact that the electric quantity of the power battery is too low is avoided.
The second reference electric quantity is, for example, 90% of the rated electric quantity of the low-voltage storage battery, and the fourth reference electric quantity is, for example, 15% of the rated electric quantity of the power battery, and the second reference electric quantity can be flexibly selected according to specific situations.
In this embodiment, when the duration of the power supply exceeds the second time, it is considered that the low-voltage storage battery fails, or the power supply charging circuit fails, and the situation that the power supply should be stopped corresponds to the power supply failure, that is, when the execution purpose of the high-voltage flow is achieved, and the power supply charging circuit is connected with the power battery, the power supply of the low-voltage storage battery still fails, that is, in this embodiment, the influencing factor of the power supply failure includes the situation that the low-voltage storage battery fails, the power supply charging circuit fails, and the like, where the high-voltage connection state of the power supply charging circuit relates to the power use safety of the high-voltage power battery.
In this embodiment, during the process of charging and supplementing the low-voltage storage battery by the power battery, the method further includes: and under the condition that the vehicle is switched into an upper function control mode, the intelligent power-on function is exited, and an upper high-voltage state of the whole vehicle controller is maintained, wherein the upper function control mode comprises a charging mode.
In the charging and supplementing process of the low-voltage storage battery, if the vehicle is switched into a charging mode, in the charging mode, an external high-voltage power supply is used as a high-voltage power supply of an upper high-voltage process, at the moment, the intelligent power supplementing function is withdrawn, the upper high-voltage state of the whole vehicle controller is maintained, the external high-voltage power supply is connected with the power battery, repeated operation of lower high voltage and upper high voltage can be avoided, the smoothness of switching of upper function control modes such as the charging mode is improved, and the working efficiency is improved.
The upper function control mode may be a function control mode such as a vehicle standby mode, etc. in which the power battery needs to be started, and the present application is not described herein.
The implementation of the method for supplementing the power to the low-voltage storage battery of the electric automobile does not need to specially change the physical architecture of the whole automobile, and is easy to implement.
Specifically, the battery power SOC of the low-voltage battery 10 is acquired through the low-voltage battery controller EBS, and the power-up requirement is determined according to a preset first reference power, so as to control the state of the power-up requirement signal (for example, the power-up requirement signal is a digital logic signal, the high-level state is an active state, and the low-level state is an inactive state).
Acquiring a whole vehicle state through a vehicle body control system BCM, judging whether the intelligent power-up function is executed or not according to the power-up function execution condition, and controlling the state of a power-up execution signal (for example, the power-up execution signal is a digital logic signal, the high-level state is an effective state, and the low-level state is an ineffective state); and judging whether the power supplementing function is interrupted or not according to the ending condition, and judging fault protection according to the high-voltage connection failure signal.
The vehicle controller VCU controls the state of the high voltage connection 13 according to the power supply execution signal to execute an upper high voltage process or a lower high voltage process, when the execution of the upper high voltage process is successful, the high voltage connection 13 is turned on, the output of the power battery 12 is communicated with the low voltage storage battery 10 through the high voltage connection 13 and the buck dc converter 11, the path forms a charging power supply loop, and the low voltage storage battery 10 is charged and supplied with power through the charging power supply loop.
The vehicle control unit VCU also detects the state of the high-voltage connector 13 to determine whether the high-voltage connection is successful or not, determine the high-voltage connection state of the charging and supplementing circuit, and provide a high-voltage connection failure signal to the vehicle control unit VCU when the high-voltage connection state is abnormal.
The method for supplementing electricity to the low-voltage storage battery of the electric automobile comprises the following steps: after the whole vehicle is dormant, controlling the opening of an intelligent power supplementing function according to the state of the low-voltage storage battery and the state of the whole vehicle; when the intelligent power supplementing function is started, an upper high-voltage flow is executed through the whole vehicle controller so as to communicate a power supplementing charging loop with a power battery, and the power battery is used for charging and supplementing power for the low-voltage storage battery; and detecting the high-voltage connection state of the power supplementing charging circuit, providing high-voltage connection failure signal feedback when the high-voltage connection state is abnormal, restarting the intelligent power supplementing function according to the high-voltage connection failure signal, guaranteeing the effective execution of charging and power supplementing of the low-voltage storage battery when short-time interference abnormality occurs, guaranteeing the reliability of power supplementing of the low-voltage storage battery, recording the high-voltage connection failure times according to the high-voltage connection failure signal, judging that the system has potential safety hazards when the high-voltage connection failure times exceed the preset reference failure times, disabling the intelligent power supplementing function, disconnecting the output of the power battery, avoiding the safety accidents caused by abnormal output of the power battery, and improving the safety of the pure electric vehicle.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few specific embodiments of the application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. The method for supplementing electricity to the low-voltage storage battery of the electric automobile is characterized by comprising the following steps of:
after the whole vehicle is dormant, controlling the opening of an intelligent power supplementing function according to the state of the low-voltage storage battery and the state of the whole vehicle;
when the intelligent power supply function is started, an effective power supply execution signal is provided for the whole vehicle controller so as to control the whole vehicle controller to execute an upper high-voltage flow, and a power supply charging loop is communicated with a power battery through the upper high-voltage flow so as to charge and supply power for the low-voltage storage battery through the power battery;
the step of executing the upper high-voltage flow by the whole vehicle controller further comprises the following steps:
after the upper high-voltage flow is finished, detecting and obtaining a high-voltage connection state of the head end of the power-supplementing charging circuit through the whole vehicle controller, and providing a high-voltage connection failure signal when the high-voltage connection state is abnormal;
acquiring high-voltage connection failure times according to the high-voltage connection failure signals, restarting the intelligent power supplementing function according to the high-voltage connection failure signals when the high-voltage connection failure times are smaller than or equal to preset reference failure times, and providing an effective power supplementing execution signal to a whole vehicle controller again so as to enable the whole vehicle controller to execute the upper high-voltage flow again; when the number of high-voltage connection failures is greater than the reference number of failures, disabling the intelligent power-up function, disabling the step of providing an effective power-up execution signal to the overall vehicle controller,
wherein, the abnormality of the high-voltage connection state includes: after the upper high-voltage process is completed, the power supplementing charging circuit fails to be communicated with the power battery, and the duration exceeds the first time.
2. The method of claim 1, wherein the first time is less than 10 seconds.
3. The electric vehicle low-voltage battery recharging method according to claim 1 or 2, characterized in that the abnormality of the high-voltage connection state further includes:
and under the condition that the intelligent electricity supplementing function is started and the electricity supplementing charging circuit is communicated with the power battery, the electricity supplementing charging circuit is disconnected from the power battery.
4. The method for recharging a low-voltage battery of an electric vehicle according to claim 3, wherein the reference failure number is at least two.
5. The method for recharging a low-voltage battery of an electric vehicle according to claim 1, wherein the step of controlling the start of the intelligent recharging function according to the state of the low-voltage battery and the state of the whole vehicle comprises:
obtaining a power supply demand signal according to the state of the low-voltage storage battery;
when the electricity supplementing demand signal is effective, providing an electricity supplementing execution signal according to the whole vehicle state;
and when the power supply executing signal is effective, starting the intelligent power supply function.
6. The method for recharging a low-voltage battery of an electric vehicle according to claim 5, wherein the step of obtaining the recharging demand signal according to the state of the low-voltage battery comprises:
the low-voltage storage battery controller is awakened at regular time, so that the battery electricity quantity of the low-voltage storage battery is acquired and obtained at regular time according to the low-voltage storage battery controller;
and providing an effective power supply demand signal when the acquired battery power of the low-voltage storage battery is lower than a first reference power.
7. The method for supplementing electricity to a low-voltage storage battery of an electric vehicle according to claim 5, wherein the step of providing the electric supplementing execution signal according to the state of the whole vehicle comprises:
when the electricity supplementing demand signal is effective, waking up a vehicle body control system so as to acquire electricity supplementing function execution conditions according to the vehicle body control system;
providing an effective power-up execution signal when the power-up function execution condition is met;
and controlling the vehicle body control system to sleep when the power supply function execution condition is not met.
8. The method for recharging a low-voltage battery of an electric vehicle according to claim 7, wherein the recharging function execution condition comprises: the hatch is in a closed state, the power battery is more than the third reference power, and the vehicle is not in other function control modes.
9. The method for recharging a low-voltage battery of an electric vehicle of claim 1, further comprising: in the process of charging and supplementing the low-voltage storage battery by the power battery, the intelligent power supplementing function is controlled to be withdrawn according to the ending condition, wherein,
the end condition includes: the battery power of the low-voltage storage battery is larger than a second reference power, the hatch cover is opened, the power supplementing duration exceeds a second time, the communication message is lost, and the battery power of the power battery is lower than a fourth reference power;
and when at least one of the end conditions is met, the intelligent power supplementing function is exited, and the connection between the power battery and the low-voltage storage battery is disconnected.
10. The method for recharging a low-voltage battery of an electric vehicle according to claim 1, further comprising, during the recharging of the low-voltage battery by the power battery:
and under the condition that the vehicle is switched into an upper function control mode, the intelligent power-on function is exited, and an upper high-voltage state of the whole vehicle controller is maintained, wherein the upper function control mode comprises a charging mode.
CN202310604423.3A 2023-05-25 2023-05-25 Electric automobile low-voltage storage battery electricity supplementing method Pending CN116852992A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310604423.3A CN116852992A (en) 2023-05-25 2023-05-25 Electric automobile low-voltage storage battery electricity supplementing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310604423.3A CN116852992A (en) 2023-05-25 2023-05-25 Electric automobile low-voltage storage battery electricity supplementing method

Publications (1)

Publication Number Publication Date
CN116852992A true CN116852992A (en) 2023-10-10

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Country Link
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