CN115001091A - Automatic charging device and method for low-voltage battery pack of new energy automobile and new energy automobile - Google Patents
Automatic charging device and method for low-voltage battery pack of new energy automobile and new energy automobile Download PDFInfo
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- CN115001091A CN115001091A CN202210652293.6A CN202210652293A CN115001091A CN 115001091 A CN115001091 A CN 115001091A CN 202210652293 A CN202210652293 A CN 202210652293A CN 115001091 A CN115001091 A CN 115001091A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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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
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an automatic charging device and method for a low-voltage battery pack of a new energy automobile and the new energy automobile, wherein the automatic charging device comprises an access control circuit and a voltage monitoring module, the voltage monitoring module is connected with the low-voltage battery pack and used for monitoring the output voltage of the low-voltage battery pack and sending an automatic charging wake-up signal to a vehicle control unit when the output voltage is lower than a preset charging starting voltage; the access control circuit is connected with the power battery pack, when the vehicle control unit receives the automatic charging wake-up signal, an automatic charging control instruction is sent to a battery management system of the new energy vehicle, the battery management system controls the access control circuit to work, so that the power battery pack is connected with the input end of a voltage conversion module of the new energy vehicle in parallel, and the output end of the voltage conversion module is connected with the low-voltage battery pack in parallel, so as to provide a charging power supply for the low-voltage battery pack. The invention can complete automatic charging of the low-voltage battery pack after power shortage, keep the auxiliary power supply to work normally and improve user experience.
Description
Technical Field
The invention relates to the field of new energy vehicles, in particular to an automatic charging device and method for a low-voltage battery pack of a new energy vehicle and the new energy vehicle.
Background
At present, auxiliary power supplies for working of control units such as a driving system and a battery management system of a new energy automobile are provided by a 24V low-voltage auxiliary power supply formed by connecting two low-voltage batteries of the same specification in series. If the auxiliary power supply is insufficient due to the fact that a driver forgets to turn off a low-voltage main switch after leaving the vehicle or the battery discharges automatically, the situation that the whole vehicle control unit cannot be started when the vehicle is operated again occurs.
For a vehicle with a fault low-voltage battery pack, the traditional starting mode is to use an over-bridge method to carry out power-up, namely, the low-voltage battery pack of another vehicle is used for carrying out power transfer to provide a low-voltage auxiliary power supply for the vehicle with the fault low-voltage battery pack. Therefore, a method is needed to actively identify and automatically charge the low-voltage battery pack, and to constantly keep the auxiliary power supply working normally.
Disclosure of Invention
The invention provides an automatic charging device and method for a low-voltage battery pack of a new energy automobile and the new energy automobile, and aims to solve the problem that a control unit of the electric automobile cannot be started due to the fact that the low-voltage battery pack cannot be automatically charged after power is lost in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an automatic charging device for a low-voltage battery pack of a new energy automobile comprises an access control circuit and a voltage monitoring module,
the voltage monitoring module is connected with the low-voltage battery pack and used for monitoring the output voltage of the low-voltage battery pack and sending an automatic charging wake-up signal to a vehicle control unit of the new energy vehicle when the output voltage is lower than a preset charging starting voltage;
the access control circuit is connected with a power battery pack of the new energy automobile, when the vehicle control unit receives an automatic charging wake-up signal, an automatic charging control instruction is sent to a battery management system of the new energy automobile, the battery management system controls the access control circuit to work according to the automatic charging control instruction, so that the power battery pack is connected in parallel with the input end of a voltage conversion module of the new energy automobile, and the output end of the voltage conversion module is connected in parallel with the low-voltage battery pack to provide a charging power supply for the low-voltage battery pack.
Further, the low-voltage battery pack is formed by connecting a plurality of low-voltage batteries in series, the voltage monitoring module comprises a low-voltage sampling circuit connected with each low-voltage battery and used for detecting the output voltage of each low-voltage battery, and when the output voltage of any low-voltage battery is lower than the preset charging starting branch voltage, an automatic charging wake-up signal is sent to the whole vehicle controller, wherein the product of the charging starting branch voltage and the number of the low-voltage batteries is smaller than or equal to the charging starting voltage.
Further, the voltage monitoring module further comprises a wireless signal transmitting device, and before the voltage monitoring module transmits the automatic charging wake-up signal to the vehicle control unit, the voltage monitoring module transmits a request confirmation signal for determining whether to perform automatic charging to a remote server.
Further, the device also comprises a first high-voltage sampling branch circuit connected with the power battery pack in parallel, wherein the first high-voltage sampling branch circuit is used for detecting the output voltage of the power battery pack, and when the output voltage of the power battery pack is lower than a preset charging protection voltage, the vehicle control unit sends an automatic charging stopping instruction to the battery management system to control the access control circuit to stop working.
Further, the access control circuit comprises a first switch, the first switch is connected in series in a loop of the power battery pack and the voltage conversion module, and when the first switch is closed, the power battery pack is connected in parallel with the input end of the voltage conversion module.
Further, the access control circuit further comprises a pre-detection switch connected with the first switch in parallel, the pre-detection switch comprises a pre-detection resistor and a second switch which are connected in series, and the second switch is controlled to be closed before the first switch so as to avoid the damage of high-voltage impact current generated by the direct closing of the first switch to other high-voltage loads of the new energy automobile.
Further, the access control circuit further comprises a second high-voltage sampling branch circuit connected with the input end of the voltage conversion module in parallel, the second high-voltage sampling branch circuit is used for collecting the voltage of the input end of the voltage conversion module, and when the voltage of the input end of the voltage conversion module reaches a preset high-voltage charging voltage, the second switch is switched off and the first switch is switched on.
Furthermore, the device also comprises a protective capacitor connected with the other high-voltage loads in parallel and used for filtering high-voltage impact current generated when the second switch and the first switch are closed.
Further, the device also comprises a third switch connected with other low-voltage loads of the new energy automobile in series, and when the low-voltage battery pack is automatically charged, the third switch is controlled to be switched off.
In another aspect of the present invention, an automatic charging method applied to the automatic charging apparatus for a low-voltage battery pack of a new energy vehicle is provided, where the method includes:
the method comprises the steps that a voltage monitoring module obtains output voltage of a low-voltage battery pack, and when the output voltage is lower than preset charging starting voltage, an automatic charging wake-up signal is sent to a whole vehicle controller of the new energy vehicle;
after receiving the automatic charging wake-up signal, a vehicle control unit of the new energy automobile sends an automatic charging control instruction to a battery management system of the new energy automobile;
after receiving an automatic charging control instruction, a battery management system of the new energy automobile controls the access control circuit to work according to the automatic charging control instruction, so that the power battery pack is connected with the input end of a voltage conversion module of the new energy automobile in parallel, and the output end of the voltage conversion module is connected with the low-voltage battery pack in parallel, so as to provide a charging power supply for the low-voltage battery pack.
Further, the controlling, by the battery management system according to the automatic charging control instruction, the operation of the access control circuit includes:
controlling the second switch to close;
and when the input voltage of the voltage conversion module reaches a preset high-voltage charging voltage, the second switch is controlled to be switched off and the first switch is controlled to be switched on.
Further, before the voltage monitoring module sends an automatic charging wake-up signal to a vehicle control unit of the new energy vehicle, the method further includes:
the voltage monitoring module sends a request confirmation signal whether to perform automatic charging to a remote server;
and when receiving a confirmation signal returned by the remote server, the voltage monitoring module sends an automatic charging wake-up signal to the vehicle control unit.
Further, the method also comprises
The vehicle control unit acquires the output voltage of the power battery pack;
the vehicle control unit judges whether the output voltage of the power battery pack is lower than a preset charging protection voltage or not;
if the voltage is lower than the preset value, the vehicle control unit sends an automatic charging stopping instruction to the battery management system to control the access control circuit to stop working.
In another aspect of the invention, a new energy automobile is provided, and the new energy automobile comprises the automatic charging device for the low-voltage battery pack of any one of the new energy automobiles.
According to the automatic charging device and method for the low-voltage battery pack of the new energy automobile and the new energy automobile, the output voltage of the low-voltage battery pack is monitored through the voltage monitoring module, the access control circuit is controlled to work when the output voltage is lower than the preset charging starting voltage, so that the power battery pack of the new energy automobile is controlled to charge the low-voltage battery pack, automatic charging of the low-voltage battery pack after power shortage is achieved, the auxiliary power supply can work normally constantly, and the automobile using experience of a user is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an automatic charging device for a low-voltage battery pack of a new energy vehicle according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an automatic charging method for a low-voltage battery pack of a new energy vehicle according to an embodiment of the present invention.
The notation in the figure is:
1. accessing a control circuit; 2. and a voltage monitoring module.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The electric control system of the new energy automobile generally comprises a high-voltage working circuit and a low-voltage working circuit, wherein a high-voltage load in the high-voltage working circuit is connected with a power battery pack of the new energy automobile in parallel, and a low-voltage load in the low-voltage working circuit is connected with a low-voltage battery pack of the new energy automobile in parallel. And a voltage conversion module DCDC is connected in parallel between the high-voltage working circuit and the low-voltage working circuit, the input end of the voltage conversion module DCDC is connected in parallel with the power battery pack, and the output end of the voltage conversion module DCDC is connected in parallel with the low-voltage battery pack and is used for converting the high voltage of the power battery pack into the low voltage so as to provide the low-voltage charging voltage for the low-voltage battery pack. Furthermore, VCU stands for the vehicle controller of the automobile; BMS stands for battery management system; DCDC stands for voltage conversion module.
Fig. 1 is a schematic structural diagram of an automatic charging device for a low-voltage battery pack of a new energy vehicle according to an embodiment of the present invention, and as can be seen from fig. 1, the automatic charging device for a new energy vehicle according to an embodiment of the present invention includes an access control circuit 1 and a voltage monitoring module 2, where the voltage monitoring module 2 is connected to the low-voltage battery pack and configured to monitor an output voltage of the low-voltage battery pack and send an automatic charging wake-up signal to a vehicle control unit VCU of the new energy vehicle when the output voltage is lower than a preset charging start voltage; the access control circuit 2 is connected with a power battery pack of the new energy automobile, when the VCU of the vehicle control unit receives an automatic charging wake-up signal, an automatic charging control instruction is sent to a battery management system BMS of the new energy automobile, the battery management system BMS controls the access control circuit 2 to work according to the automatic charging control instruction, so that the power battery pack is connected with the input end of a voltage conversion module DCDC of the new energy automobile in parallel, the output end of the voltage conversion module DCDC is connected with a low-voltage battery pack in parallel, and a charging power supply is provided for the low-voltage battery pack.
Further, in the embodiment of the present invention, the low-voltage battery pack is formed by connecting a plurality of low-voltage batteries in series, the voltage monitoring module 1 includes a low-voltage sampling circuit connected to each low-voltage battery, and is configured to detect an output voltage of each low-voltage battery, and when the output voltage of any one low-voltage battery is lower than a preset charging start branch voltage, the voltage monitoring module 1 sends an automatic charging wake-up signal to the vehicle control unit VCU. And the product of the voltage of the charging starting branch circuit and the number of the low-voltage batteries is less than or equal to the charging starting voltage.
It should be noted that, the voltage monitoring module 1 in the embodiment of the present invention needs to monitor both the overall output voltage of the low-voltage battery pack and the output voltage of each low-voltage battery in the low-voltage battery pack, and when the output voltage of the low-voltage battery pack is lower than the preset charging start voltage or the output voltage of any low-voltage battery is lower than the preset charging start branch voltage, the voltage monitoring module 1 sends an automatic charging wake-up signal to the vehicle control unit VCU. The charging starting voltage and the charging starting branch voltage are set in advance by the system according to needs. In addition, the low voltage battery pack may exhibit a different output voltage from each low voltage battery when the battery is in a power shortage state, and the output voltage from each low voltage battery may exhibit the same voltage form when the charging mode is turned on.
Specifically, a low-voltage battery pack of the new energy automobile is generally formed by connecting two 12V low-voltage batteries in series to form a 24V low-voltage battery pack, the output voltage of the low-voltage battery collected by a low-voltage sampling circuit connected with each low-voltage battery is V3 and V4, and when the output voltage of the low-voltage battery pack is lower than 18V or the output voltage of any low-voltage battery is lower than 9V, the voltage monitoring module 1 sends an automatic charging wake-up signal to the VCU of the vehicle controller.
Further, the voltage monitoring module 1 further includes a wireless signal transmitting device, and transmits a request confirmation signal indicating whether to perform automatic charging to the remote server before the voltage monitoring module 1 transmits the automatic charging wake-up signal to the vehicle control unit VCU. It should be noted that the remote server may be a product that can interact with the vehicle owner, such as a mobile phone, a computer or a vehicle key, applied by the vehicle owner, and the remote server does not limit the application, and after the vehicle owner confirms the product and returns a confirmation signal by the remote server, the low-voltage battery pack is automatically charged, and if the vehicle owner does not agree or does not receive the confirmation signal, the automatic charging is cancelled.
Further, in order to ensure the electricity safety of the power battery pack, the automatic charging device for the low-voltage battery pack according to the embodiment of the invention further includes a first high-voltage sampling branch connected in parallel with the power battery pack, where the first high-voltage sampling branch is used to detect the output voltage V1 of the power battery pack, and when the output voltage V1 of the power battery pack is lower than a preset charging protection voltage, the vehicle control unit VCU sends an automatic charging stop instruction to the battery management system BMS to control the access control circuit 2 to stop working.
Further, the access control circuit comprises a first switch K1, wherein the first switch K1 is connected in series in a loop of the power battery pack and the voltage conversion module DCDC, and when the first switch K1 is closed, the power battery pack is connected in parallel with the input end of the voltage conversion module DCDC.
Further, the access control circuit 2 further comprises a pre-detection switch connected with the first switch K1 in parallel, the pre-detection switch comprises a pre-detection resistor R1 and a second switch K2 which are connected in series, and before the first switch is closed, the second switch is controlled to be closed, so that the high-voltage impact current generated by the direct closing of the first switch is prevented from damaging other high-voltage loads of the new energy automobile.
Further, in order to determine the suitable timing of the switching transitions of the second switch K2 and the first switch K1, the access control circuit 2 of the present invention further includes a second voltage sampling branch connected in parallel with the input terminal of the voltage conversion module DCDC, where the second voltage sampling branch is used for collecting the voltage V2 at the input terminal of the voltage conversion module DCDC, and when the voltage V2 at the input terminal of the voltage conversion module DCDC reaches the preset high-voltage charging voltage, the second switch K2 is opened and the first switch K1 is opened and closed. The high-voltage charging voltage is a value close to the output voltage V1 of the power battery pack, and the specific value is set in advance by the system.
Further, in order to ensure the safety of the voltage conversion module DCDC and other non-disconnected high-voltage loads, the automatic charging device for the low-voltage battery pack according to the embodiment of the present invention further includes a protection capacitor C connected in parallel with other high-voltage loads of the new energy vehicle, and configured to filter a high-voltage inrush current generated when the second switch K2 and the first switch K1 are closed. The access of the protective capacitor C further improves the safety of the automatic charging device of the low-voltage battery pack of the new energy automobile.
In addition, in order to prevent other low-voltage loads from entering an operating state during charging, the automatic charging device for the low-voltage battery pack provided by the embodiment of the invention further comprises a third switch K3 connected in series with other low-voltage loads of the new energy automobile, and when the low-voltage battery pack is automatically charged, the third switch K3 is controlled to be turned off.
Fig. 2 is a schematic flow chart of an automatic charging method for a low-voltage battery pack of a new energy vehicle according to an embodiment of the present invention, and as can be seen from fig. 2, the automatic charging method for a low-voltage battery pack of a new energy vehicle according to an embodiment of the present invention includes:
s1, the voltage monitoring module 1 obtains the output voltage of the low-voltage battery pack, and when the output voltage is lower than a preset charging starting voltage, an automatic charging wake-up signal is sent to a vehicle control unit (ACU) of the new energy automobile;
in the embodiment of the present invention, the voltage monitoring module 1 simultaneously sends the wake-up signal to the vehicle control unit VCU and simultaneously sends the automatic charging wake-up signal to the battery management system BMS and the voltage conversion module DCDC. And after receiving the awakening signal, the VCU, the BMS and the DCDC of the whole vehicle control system are awakened, and then the automatic link of the subsequent low-voltage battery is entered after self-checking is carried out without fault.
It should be noted that the automatic charging wake-up signal in the embodiment of the present invention is different from the key wake-up signal ACC and exists independently, and the executed strategy is different from the key wake-up signal ACC wake-up.
Further, in another embodiment of the present invention, before sending the automatic charging wake-up signal to the vehicle control unit VCU of the new energy vehicle, the voltage monitoring module 1 needs to send a request confirmation signal for determining whether to perform automatic charging to the remote server; when receiving a confirmation signal returned by the remote server, the voltage monitoring module 1 sends an automatic charging wake-up signal to the vehicle control unit VCU.
S2, after receiving the automatic charging wake-up signal, the VCU sends an automatic charging control instruction to the BMS of the new energy automobile;
and S3, after receiving an automatic charging control instruction, the battery management system BMS of the new energy automobile controls the access control circuit 2 to work according to the automatic charging control instruction, so that the power battery pack BMS is connected with the input end of a voltage conversion module DCDC of the new energy automobile in parallel, and the output end of the voltage conversion module DCDC is connected with the low-voltage battery pack in parallel, so as to provide a charging power supply for the low-voltage battery pack.
In the embodiment of the present invention, the controlling, by the battery management system BMS, the operation of the access control circuit according to the automatic charging control instruction includes: controlling the second switch K2 to close; acquiring an input voltage V2 of the voltage conversion module DCDC, and judging whether the input voltage V2 of the voltage conversion module DCDC reaches a preset high-voltage charging voltage; when the input voltage of the voltage conversion module DCDC reaches a preset high-voltage charging voltage, the second switch K2 is controlled to be opened and the first switch K1 is controlled to be closed.
It should be noted that, in the embodiment of the present invention, the battery management system BMS needs to determine whether the first switch K1 is in the closed state before controlling the second switch K2 to be closed, and needs to open the first switch K1 first if the first switch K1 is already in the closed state. In addition, after the battery management system BMS controls to close the second switch K2, the current state of the second switch K2 also needs to be fed back to the vehicle management system VCU, so that the vehicle management system VCU can monitor the running state of the vehicle in real time.
Further, in the automatic charging process of the low-voltage battery pack of the new energy automobile according to the embodiment of the invention, the method further comprises the following steps which are not shown in the attached drawings:
s4, the voltage monitoring module 1 obtains the output voltage of the low-voltage battery pack, and when the output voltage reaches a preset charging stop voltage, an automatic charging stop signal is sent to a vehicle control unit ACU of the new energy automobile. At the moment, the vehicle control unit ACU sends a charging stop control signal to the battery management system BMS, the battery management system BMS controls the second switch K2 to be disconnected, the access control circuit 2 stops working, and automatic charging is in contact. In addition, the vehicle control unit ACU, the battery management system BMS and the voltage conversion module enter the dormant state again, and the low-voltage battery pack of the new energy automobile completes one-time automatic charging.
Further, in the automatic charging method for the low-voltage battery pack of the new energy automobile provided by the embodiment of the invention, before the voltage monitoring module 1 sends the automatic charging wake-up signal to the vehicle control unit VCU of the new energy automobile, the method further includes: the voltage monitoring module 1 sends a request confirmation signal whether to perform automatic charging to a remote server; when receiving a confirmation signal returned by the remote server, the voltage monitoring module 1 sends an automatic charging wake-up signal to the vehicle control unit VCU.
In addition, the automatic charging method for the low-voltage battery pack of the new energy automobile provided by the embodiment of the invention further comprises the steps that the vehicle control unit VCU obtains the output voltage V1 of the power battery pack; judging whether the output voltage V1 of the power battery pack is lower than a preset charging protection voltage or not; if the voltage is lower than the preset value, the VCU sends an automatic charging stop instruction to the BMS to control the access control circuit 2 to stop working.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
In another aspect of the invention, the new energy automobile is further provided, and the new energy automobile comprises the automatic charging device for the low-voltage battery pack of the new energy automobile, and the automatic charging device is used for controlling the automatic charging of the low-voltage battery pack.
According to the automatic charging device and method for the low-voltage battery pack of the new energy automobile and the new energy automobile, the output voltage of the low-voltage battery pack is monitored through the voltage monitoring module, the access control circuit is controlled to work when the output voltage is lower than the preset charging starting voltage, so that the power battery pack of the new energy automobile is controlled to charge the low-voltage battery pack, automatic charging of the low-voltage battery pack after power shortage is achieved, the auxiliary power supply can work normally constantly, and the automobile using experience of a user is improved.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, any of the embodiments claimed herein may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. An automatic charging device for a low-voltage battery pack of a new energy automobile is characterized by comprising an access control circuit and a voltage monitoring module,
the voltage monitoring module is connected with the low-voltage battery pack and used for monitoring the output voltage of the low-voltage battery pack and sending an automatic charging wake-up signal to a vehicle control unit of the new energy vehicle when the output voltage is lower than a preset charging starting voltage;
the access control circuit is connected between a power battery pack and a voltage conversion module of the new energy automobile, when the vehicle control unit receives an automatic charging wake-up signal, an automatic charging control instruction is sent to a battery management system of the new energy automobile, the battery management system controls the access control circuit to work according to the automatic charging control instruction, so that the power battery pack is connected with the input end of the voltage conversion module of the new energy automobile in parallel, the output end of the voltage conversion module is connected with the low-voltage battery pack in parallel, and a charging power supply is provided for the low-voltage battery pack.
2. The device according to claim 1, wherein the low-voltage battery pack is composed of a plurality of low-voltage batteries connected in series, the voltage monitoring module comprises a low-voltage sampling circuit connected with each low-voltage battery for detecting the output voltage of each low-voltage battery, and when the output voltage of any one low-voltage battery is lower than a preset charging starting branch voltage, an automatic charging wake-up signal is sent to the vehicle control unit, wherein the product of the charging starting branch voltage and the number of the low-voltage batteries is smaller than or equal to the charging starting voltage.
3. The apparatus according to claim 1 or 2, wherein the voltage monitoring module further comprises a wireless signal transmitting means for transmitting a request confirmation signal to a remote server for automatic charging before the voltage monitoring module transmits the automatic charging wake-up signal to the vehicle control unit.
4. The device of claim 1, further comprising a first high-voltage sampling branch circuit connected with the power battery pack in parallel, wherein the first high-voltage sampling branch circuit is used for detecting the output voltage of the power battery pack, and when the output voltage of the power battery pack is lower than a preset charging protection voltage, the vehicle control unit sends an automatic charging stop instruction to the battery management system to control the access control circuit to stop working.
5. The apparatus of claim 1, wherein the access control circuit comprises a first switch connected in series in a loop between the power battery pack and the voltage conversion module, wherein the power battery pack is connected in parallel with the input of the voltage conversion module when the first switch is closed.
6. The device according to claim 5, wherein the access control circuit further comprises a pre-detection switch connected in parallel with the first switch, the pre-detection switch comprises a pre-detection resistor and a second switch which are connected in series, and the second switch is controlled to be closed before the first switch is closed, so that damage to other high-voltage loads of the new energy automobile caused by high-voltage rush current generated by direct closing of the first switch is avoided.
7. The apparatus of claim 6, wherein the access control circuit further comprises a second high voltage sampling branch connected in parallel with the input terminal of the voltage conversion module, the second high voltage sampling branch is configured to collect a voltage at the input terminal of the voltage conversion module, and when the voltage at the input terminal of the voltage conversion module reaches a preset high voltage charging voltage, the second switch is opened and the first switch is closed.
8. The apparatus of claim 6, further comprising a protection capacitor connected in parallel with the other high voltage loads for filtering a high voltage inrush current generated when the second switch and the first switch are closed.
9. The device of claim 1, further comprising a third switch connected in series with other low-voltage loads of the new energy vehicle, wherein the third switch is controlled to be turned off when the low-voltage battery pack is automatically charged.
10. An automatic charging method applied to the automatic charging device for the low-voltage battery pack of the new energy automobile according to any one of claims 1 to 9, characterized by comprising the following steps:
the method comprises the steps that a voltage monitoring module obtains output voltage of a low-voltage battery pack, and when the output voltage is lower than preset charging starting voltage, an automatic charging wake-up signal is sent to a whole vehicle controller of the new energy vehicle;
after receiving the automatic charging wake-up signal, a vehicle control unit of the new energy automobile sends an automatic charging control instruction to a battery management system of the new energy automobile;
after receiving an automatic charging control instruction, the battery management system of the new energy automobile controls the access control circuit to work according to the automatic charging control instruction, so that the power battery pack is connected with the input end of a voltage conversion module of the new energy automobile in parallel, and the output end of the voltage conversion module is connected with the low-voltage battery pack in parallel, so as to provide a charging power supply for the low-voltage battery pack.
11. The method of claim 10, wherein the controlling the operation of the access control circuit by the battery management system according to the automatic charging control command comprises:
controlling the second switch to close;
and when the input voltage of the voltage conversion module reaches a preset high-voltage charging voltage, the second switch is controlled to be switched off and the first switch is controlled to be switched on.
12. The method according to claim 10, wherein before the voltage monitoring module sends the automatic charge wake-up signal to the vehicle control unit of the new energy vehicle, the method further comprises:
the voltage monitoring module sends a request confirmation signal for judging whether to perform automatic charging or not to a remote server;
and when receiving a confirmation signal returned by the remote server, the voltage monitoring module sends an automatic charging wake-up signal to the vehicle control unit.
13. The method of claim 10, further comprising
The vehicle control unit acquires the output voltage of the power battery pack;
the vehicle control unit judges whether the output voltage of the power battery pack is lower than a preset charging protection voltage or not;
if the voltage is lower than the preset value, the vehicle control unit sends an automatic charging stopping instruction to the battery management system to control the access control circuit to stop working.
14. A new energy automobile, characterized by comprising the automatic charging device for the low-voltage battery pack of the new energy automobile according to any one of claims 1 to 9.
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| CN202210652293.6A CN115001091A (en) | 2022-06-10 | 2022-06-10 | Automatic charging device and method for low-voltage battery pack of new energy automobile and new energy automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115366682A (en) * | 2022-09-14 | 2022-11-22 | 湖南行必达网联科技有限公司 | Power supply method and device for electric vehicle and electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115366682A (en) * | 2022-09-14 | 2022-11-22 | 湖南行必达网联科技有限公司 | Power supply method and device for electric vehicle and electric vehicle |
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