CN110957543A - Floating charge-free storage battery grouping system and charging method - Google Patents
Floating charge-free storage battery grouping system and charging method Download PDFInfo
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- CN110957543A CN110957543A CN201911382715.7A CN201911382715A CN110957543A CN 110957543 A CN110957543 A CN 110957543A CN 201911382715 A CN201911382715 A CN 201911382715A CN 110957543 A CN110957543 A CN 110957543A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a floating charge-free storage battery grouping system and a charging method, wherein the system comprises a diode, an IGBT power device, a battery pack and a control module, the diode is connected with the IGBT power device in parallel, the IGBT device is connected with the control module, and the anode of the battery pack is connected with the intersection point of the IGBT power device and the diode; the diode, the IGBT power device, the battery pack and the control module form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units. According to the invention, the IGBT power device is controlled to be switched on, so that the direct-current bus charges the battery, and after the charging is finished, the IGBT power device is controlled to be switched off, so that the floating charging of the battery pack is avoided; compared with the traditional battery pack, the battery pack does not need to be subjected to long-time floating charge, so that the damage of the floating charge to the battery pack is avoided, and the service life of the battery pack is greatly prolonged. And moreover, by arranging the diodes, circulation currents cannot be generated among the groups of storage battery grouping units.
Description
Technical Field
The invention relates to the technical field of storage batteries, in particular to a floating-charge-free storage battery grouping system and a charging method.
Background
The direct current system is an important component of the transformer substation, and a storage battery pack in the direct current system provides safe, stable and reliable power guarantee for a secondary system load in the power system, so that normal operation of control, protection and communication equipment of the transformer substation is ensured. The stability of the battery and the actual capacity that can be supplied to the load during discharge are of great importance to ensure safe operation of the power plant.
The present grouping mode of storage batteries of a power system transformer substation and a power plant is in series connection, when a certain battery fails, the whole battery pack fails, the present battery pack always runs in a mode of being uninterruptedly and directly connected with a bus for floating charging for 24 hours, and the long-term uninterrupted floating charging damages the storage batteries, so that the service life of the storage batteries is shortened, and therefore, the present grouping mode of most storage batteries of the power system has a great problem.
In summary, in the prior art, the grouping manner of most of the storage batteries of the power system has a great problem, which results in the reduction of the service life of the storage battery pack.
Disclosure of Invention
The invention provides a floating charge-free storage battery grouping system and a charging method, which solve the technical problem that the service life of a storage battery pack is shortened due to the fact that a great problem exists in the grouping mode of most storage batteries of a power system in the prior art.
The invention provides a floating charge-free storage battery grouping system which comprises a diode, an IGBT power device, a battery pack and a control module, wherein the diode is connected with the IGBT power device in parallel, the IGBT power device is connected with the control module, and the anode of the battery pack is connected with the intersection point of the IGBT power device and the diode; the diode, the IGBT power device, the battery pack and the control module form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units.
Preferably, in each battery grouping unit, the anode of the diode is connected with the emitter of the IGBT power device, the cathode of the diode is connected with the collector of the IGBT power device, the base of the IGBT power device is connected with the control module, and the anode of the battery pack is connected with the anode of the diode and the emitter of the IGBT power device.
Preferably, the storage battery grouping unit further comprises a voltage and current acquisition module, an output end of the voltage and current acquisition module is connected with the control module, and an acquisition end of the voltage and current acquisition module is connected with the battery pack.
Preferably, the battery pack is formed by connecting a plurality of batteries in series.
Preferably, the control module comprises a processor and a PWM driving circuit, an input end of the PWM driving circuit is connected to an output end of the control module, and an output end of the PWM driving circuit is connected to a base of the IGBT power device.
Preferably, the system further comprises a storage module, and the storage module is connected with the output end of the voltage and current acquisition module.
A method for charging a floating charge-free storage battery is based on the floating charge-free storage battery grouping system, and comprises the following steps:
connecting the floating charge-free storage battery grouping system with a direct current bus;
setting a voltage setting value and a current setting value of a floating charge-free storage battery grouping system;
starting a floating charge-free storage battery grouping system, and controlling a voltage and current acquisition module in each storage battery grouping unit to acquire voltage and current data of a battery pack to obtain a monitoring value;
and comparing the monitoring value with the setting value, and adjusting the driving signal of the IGBT power device according to the deviation between the monitoring value and the setting value until the deviation is reduced.
Preferably, the floating charge-free storage battery grouping system is connected with the direct current bus in the following mode:
and connecting the cathode of the diode of each storage battery grouping unit and the collector of the IGBT power device with the anode direct current bus, and connecting the cathode of the battery pack with the cathode direct current bus.
Preferably, the specific way of adjusting the driving signal of the IGBT power device is:
and controlling the PWM signal output by the PWM driving circuit through the control module according to the deviation value, and taking the PWM signal as a driving signal of the IGBT power device.
Preferably, the electric quantity of the battery pack is judged according to the deviation value, when the electric quantity of the battery pack is insufficient, the IGBT power device is controlled to be conducted, and the direct-current bus charges the battery pack; and when the battery pack is fully charged, the IGBT power device is controlled to be cut off, and the charging process is stopped.
According to the technical scheme, the invention has the following advantages:
according to the embodiment of the invention, by detecting the electric quantity of the battery pack, when the electric quantity of the battery pack is insufficient, the IGBT power device is controlled to be conducted, the direct-current bus charges the battery, and after the charging is finished, the IGBT power device is controlled to be turned off, so that the floating charging of the battery pack is avoided; compared with the traditional battery pack, the battery pack in the embodiment of the invention does not need to be subjected to long-time floating charge, so that the harm of the floating charge to the battery pack is avoided, and the service life of the battery pack is greatly prolonged.
The embodiment of the invention also has the following advantages:
the floating charge-free storage battery grouping system provided by the embodiment of the invention has good convenience and high reliability, when any battery pack fails, other battery packs are not influenced, and the failed battery pack can be maintained on line; and when any group of battery pack fails, other battery packs can supply power to the load, so that the reliability of the battery pack is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a system structure diagram of a floating charge-free battery grouping system and a charging method according to an embodiment of the present invention.
Fig. 2 is an internal structural diagram of a control module of a floating charge-free battery grouping system and a charging method according to an embodiment of the present invention.
Fig. 3 is a flowchart of a method for grouping a non-float charging storage battery and a charging method according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a floating charge-free storage battery grouping system and a charging method, which solve the technical problem that the service life of a storage battery pack is reduced due to the fact that a great problem exists in the grouping mode of most storage batteries of a power system in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the condition that the direct current system with double batteries has the circulating current risk caused by the short-time parallel connection of the storage battery packs in the operation and maintenance process of the storage battery, taking the transformer substation direct current system with the double batteries as an example, the direct current system is traditionally configured in such a way that a direct current screen 1# is connected with the storage battery pack 1#, a direct current screen 2# is connected with the storage battery pack 2#, the direct current buses are controlled by a switch, and the direct current buses are mutually used as backup power supplies in the abnormal or maintenance process. When the second direct current system is switched to the first direct current system for standby, in order to avoid the voltage difference between the discharged storage battery pack 1# and a direct current screen 1# or a storage battery pack 2# loop to cause the damage of large current to the direct current system, the bus needs to be controlled to be switched on, the direct current screen 1# is withdrawn, the storage battery pack 1# is withdrawn, and the direct current screen 2# plays a role in supplying power to a standby power supply of the first direct current system. After discharging, manually adjusting the direct current screen 1# to reduce charging voltage, gradually increasing the output voltage of the direct current screen, charging the storage battery pack 1# and re-connecting the direct current screen 1# and the storage battery pack 1# into the system after full charging, controlling the disconnection of the bus and the power bus and recovering the connection of the original system before discharging.
The condition that the storage batteries are directly connected in parallel occurs during standby access and standby exit, and the operation personnel can only connect in parallel for a short time by ensuring that the differential pressure of the direct current system is less than 2V. When voltage difference exists between the two groups of battery terminal voltages which are directly connected in parallel, the high-voltage battery pack discharges to the low-voltage battery pack, and a circulation current is generated. The larger the difference of the internal resistances of the storage battery packs is, the larger the voltage difference is, and the larger the circulating current is. Even a short circulation process can seriously affect the service life of the battery, and even can cause damage to the battery.
Referring to fig. 1, fig. 1 is a system structure diagram of a floating charge-free battery grouping system and a charging method according to an embodiment of the present invention.
As shown in fig. 1, a floating charge-free battery grouping system comprises a diode 2, an IGBT power device 1, a battery pack 4 and a control module 3, wherein the diode 2 is connected in parallel with the IGBT power device 1, the IGBT device is connected with the control module 3, and the anode of the battery pack 4 is connected to the intersection point of the IGBT power device 1 and the diode 2; the diode 2, the IGBT power device 1, the battery pack 4 and the control module 3 form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units.
When the system is used, the anode of the direct current bus 6 is connected with the diode 2 and the IGBT power device 1, the cathode of the direct current bus 6 is connected with the cathode of the battery pack 4, the control module 3 controls the on and off of the IGBT power device 1, when the IGBT power device 1 is switched on, the battery pack 4 starts to charge, when the IGBT power device 1 is switched off, the battery pack 4 stops charging, the charging process of the battery pack 4 is realized by controlling the IGBT power device 1, at the moment, the battery pack 4 is in a full-charge and self-discharge condition, after the IGBT is switched off, the electromotive force value is lower than the voltage value of the direct current bus 6 due to the characteristics of the battery, the battery pack is in a self-discharge and non-floating charge mode, in the system, each battery pack 4 can independently monitor and control voltage and current, the charging and discharging between each battery pack 4 are not influenced by each other, and due to the characteristics of the diode, circulation currents cannot be generated among the grouped units of the plurality of groups of storage batteries.
In each battery grouping unit, the anode of the diode 2 is connected with the emitter of the IGBT power device 1, the cathode of the diode 2 is connected with the collector of the IGBT power device 1, the base of the IGBT power device 1 is connected with the control module 3, and the anode of the battery pack 4 is connected with the anode of the diode 2 and the emitter of the IGBT power device 1.
As a preferred embodiment, the storage battery grouping unit further includes a voltage and current acquisition module 5, an output end of the voltage and current acquisition module 5 is connected to the control module 3, an acquisition end of the voltage and current acquisition module 5 is connected to the battery pack 4, voltage and current data of the battery pack 4 are acquired through the voltage and current acquisition module 5, whether the battery pack 4 is fully charged is judged according to the voltage and current data, and then the IGBT power device 1 is controlled to realize a charging process of the battery pack 4.
As a preferred embodiment, the battery pack 4 is formed by connecting a plurality of batteries in series, the number of the batteries connected in series is related to the voltage level output by the dc bus 6, and generally 52 to 54 lead-acid batteries (a dc power system with a nominal voltage of 110V) or 104 to 108 lead-acid batteries (a dc power system with a nominal voltage of 220V) are required, different battery packs 4 may be different types of batteries, for example, a first battery pack is a lead-acid battery, and a second battery pack is a lithium iron phosphate battery;
as a preferred embodiment, as shown in fig. 2, the control module 3 includes a processor 7 and a PWM driving circuit 8, an input terminal of the PWM driving circuit 8 is connected to an output terminal of the processor 7, and an output terminal of the PWM driving circuit 8 is connected to the base of the IGBT power device 1. When the PWM driving circuit 8 outputs a high level, the IGBT power device 1 is turned on, and when the PWM driving circuit 8 outputs a low level, the IGBT power device 1 is turned off, so that the turn-on and turn-off of the IGBT power device 1 are controlled by the PWM driving circuit 8.
As a preferred embodiment, the system further comprises a storage module 9, and the storage module 9 is connected with the output end of the voltage and current collection module 5. The storage module 9 is used for storing the acquired data, so that later-stage workers can call the data conveniently.
Referring to fig. 3, fig. 3 is a flowchart of a method for a floating charge-free battery grouping system and a charging method according to an embodiment of the present invention.
As shown in fig. 3, a method for charging a float-free storage battery, based on the above-mentioned grouping system for float-free storage batteries, includes the following steps:
connecting the floating charge-free storage battery grouping system with a direct current bus 6;
setting a voltage setting value and a current setting value of a floating charge-free storage battery grouping system, and using the setting values as the standard for fully charging the battery pack 4;
starting a floating charge-free storage battery grouping system, and controlling a voltage and current acquisition module 5 in each storage battery grouping unit to acquire voltage and current data of a battery pack 4 to obtain a monitoring value;
comparing the monitoring value with the setting value, judging whether a deviation exists between the monitoring value and the setting value, adjusting the on-off of the IGBT power device 1 according to the deviation between the monitoring value and the setting value, starting charging of the battery pack 4 when the IGBT power device 1 is on, stopping charging of the battery pack 4 when the IGBT power device 1 is off, and repeating the step until the deviation is reduced.
As a preferred embodiment, the floating charge free battery grouping system is connected to the dc bus 6 in the following manner:
the cathode of the diode 2 and the collector of the IGBT power device 1 of each battery grouping unit are connected to the positive electrode of the dc bus 6, and the negative electrode of the battery pack 4 is connected to the negative electrode of the dc bus 6.
As a preferred embodiment, the specific way of adjusting the driving signal of the IGBT power device 1 is as follows:
and controlling the PWM signal output by the PWM driving circuit 8 through the processor 7 according to the deviation value, wherein the PWM signal is used as a driving signal of the IGBT power device 1, when the PWM driving circuit 8 outputs a high level, the IGBT power device 1 is switched on, and when the PWM driving circuit 8 outputs a low level, the IGBT power device 1 is switched off.
As a preferred embodiment, the electric quantity of the battery pack 4 is judged according to the deviation value, when the electric quantity of the battery pack 4 is insufficient, the IGBT power device 1 is controlled to be turned on, and the direct-current bus 6 charges the battery pack 4; and when the battery pack 4 is full of electricity, the IGBT power device 1 is controlled to be cut off, and the charging process is stopped.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 (10)
1. A floating charge-free storage battery grouping system is characterized by comprising a diode, an IGBT power device, a battery pack and a control module, wherein the diode is connected with the IGBT power device in parallel, the IGBT power device is connected with the control module, and the anode of the battery pack is connected with the intersection point of the IGBT power device and the diode; the diode, the IGBT power device, the battery pack and the control module form a storage battery grouping unit, and the system comprises a plurality of groups of storage battery grouping units.
2. The float-free battery grouping system as claimed in claim 1, wherein in each battery grouping unit, the anode of the diode is connected with the emitter of the IGBT power device, the cathode of the diode is connected with the collector of the IGBT power device, the base of the IGBT power device is connected with the control module, and the anode of the battery group is connected with the anode of the diode and the emitter of the IGBT power device.
3. The system of claim 2, wherein the battery grouping unit further comprises a voltage and current collecting module, an output end of the voltage and current collecting module is connected with the control module, and a collecting end of the voltage and current collecting module is connected with the battery pack.
4. The float-free battery grouping system of claim 3 wherein the battery pack is formed by a plurality of cells connected in series.
5. The float-free battery grouping system of claim 4 wherein the control module comprises a processor and a PWM drive circuit, wherein an input of the PWM drive circuit is connected to an output of the control module, and an output of the PWM drive circuit is connected to the base of the IGBT power device.
6. The system of claim 5, further comprising a storage module connected to the output of the voltage and current acquisition module.
7. A method for charging a float-free storage battery, which is based on the float-free storage battery grouping system of any one of the above claims 1-6, and is characterized by comprising the following steps:
connecting the floating charge-free storage battery grouping system with a direct current bus;
setting a voltage setting value and a current setting value of a floating charge-free storage battery grouping system;
starting a floating charge-free storage battery grouping system, and controlling a voltage and current acquisition module in each storage battery grouping unit to acquire voltage and current data of a battery pack to obtain a monitoring value;
and comparing the monitoring value with the setting value, and adjusting the driving signal of the IGBT power device according to the deviation between the monitoring value and the setting value until the deviation is reduced.
8. The method for charging a float-free storage battery according to claim 7, wherein the grouping system of the float-free storage battery is connected with the direct current bus in the following way:
and connecting the cathode of the diode of each storage battery grouping unit and the collector of the IGBT power device with the anode direct current bus, and connecting the cathode of the battery pack with the cathode direct current bus.
9. The method for charging the float-free storage battery according to claim 8, wherein the specific way of adjusting the driving signal of the IGBT power device is as follows:
and controlling the PWM signal output by the PWM driving circuit through the control module according to the deviation value, and taking the PWM signal as a driving signal of the IGBT power device.
10. The method for charging a float-free storage battery of claim 9, wherein the electric quantity of the battery pack is judged according to the deviation value, when the electric quantity of the battery pack is insufficient, the IGBT power device is controlled to be turned on, and the direct current bus bar charges the battery pack; and when the battery pack is fully charged, the IGBT power device is controlled to be cut off, and the charging process is stopped.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116979661A (en) * | 2023-09-21 | 2023-10-31 | 宁波吉利汽车研究开发有限公司 | Whole vehicle low-voltage energy management method and system and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116979661A (en) * | 2023-09-21 | 2023-10-31 | 宁波吉利汽车研究开发有限公司 | Whole vehicle low-voltage energy management method and system and vehicle |
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