CN113381487B - Battery management method and system for preventing lithium battery from losing efficacy for vehicle-mounted terminal - Google Patents

Battery management method and system for preventing lithium battery from losing efficacy for vehicle-mounted terminal Download PDF

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Publication number
CN113381487B
CN113381487B CN202110922044.XA CN202110922044A CN113381487B CN 113381487 B CN113381487 B CN 113381487B CN 202110922044 A CN202110922044 A CN 202110922044A CN 113381487 B CN113381487 B CN 113381487B
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battery
voltage
charging
detection
temperature
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CN113381487A (en
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陈军
梁泽峰
吴庭波
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Shenzhen Yuwei Information & Technology Development Co ltd
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Shenzhen Yuwei Information & Technology Development Co ltd
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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
    • 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
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H02J7/0049—Detection of fully charged condition
    • 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
    • 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
    • H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
    • 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
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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

Abstract

The application provides a battery management method and a system for preventing a lithium battery from losing efficacy for a vehicle-mounted terminal, and the method comprises the following steps: after the vehicle-mounted terminal is started, detecting the voltage of a battery; if the detected battery voltage is lower than a first voltage threshold value, continuously detecting the battery voltage for a first detection duration at a first detection frequency; if the battery voltage continuously detected within a first detection time period at a first detection frequency is lower than a first threshold value, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold value, starting charging of the lithium battery; if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, continuously detecting the battery voltage at a second detection frequency for a second detection time period; and if the battery voltage continuously detected within a second detection time period at a second detection frequency is lower than a second threshold value, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold value, starting charging of the lithium battery.

Description

Battery management method and system for preventing lithium battery from losing efficacy for vehicle-mounted terminal
Technical Field
The application relates to the technical field of general batteries, in particular to a battery management method and system for preventing a lithium battery from failing and used for a vehicle-mounted terminal.
Background
The battery is used as a power supply tool, and the use safety of the battery is related to the use safety of the electric equipment. The lithium battery is widely applied in use as a preference of a power supply battery, but the battery often has the problems of bulging, liquid leakage, explosion and the like in the actual use process, so that the safety of electric equipment is damaged. Many safety incidents are also caused by damage to the battery.
Lithium iron phosphate batteries are currently used instead of lithium batteries. The electrochemical performance of the lithium iron phosphate battery is stable, the battery structure cannot be changed in the charging and discharging process, and the problems of combustion, explosion and the like cannot occur. However, the lithium iron phosphate battery has a higher cost than a lithium battery, which increases the battery cost, and contains chemical substances harmful to the environment and human health, such as lithium hexafluorophosphate, organic carbonate, and copper.
Currently, there are also technologies that improve the lithium battery, such as improving the cell process in the lithium battery, or adding a temperature detection limit charging technology in the battery protection board. However, these techniques not only increase the manufacturing cost of lithium batteries, but also do not improve the existing battery utilization market.
In practical use, for example: a trolley for traveling, a passenger car and a special road vehicle for transporting dangerous chemical substances, fireworks and crackers and the like. When a vehicle runs, data loss in the vehicle-mounted terminal caused by the fact that the power cannot be supplied to the vehicle-mounted terminal after the main power fails due to failure of the lithium battery may occur; or the safety problem of vehicle running caused by the failure and explosion of the lithium battery in the use of the vehicle.
Therefore, a reliable battery management method and system for an on-vehicle terminal for preventing a lithium battery from failing is required.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The application aims to provide a battery management method and a system for preventing a lithium battery from losing efficacy for a vehicle-mounted terminal, which can realize effective charging and discharging management of the battery and can prolong the service life of the battery.
According to an aspect of the present application, a battery management method for a vehicle-mounted terminal for preventing a lithium battery from failing includes:
after the vehicle-mounted terminal is started, detecting the voltage of a battery;
if the detected battery voltage is lower than a first voltage threshold value, continuously detecting the battery voltage for a first detection duration at a first detection frequency;
if the battery voltage continuously detected within a first detection time period at a first detection frequency is lower than the first voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, continuously detecting the battery voltage at a second detection frequency for a second detection time period;
if the battery voltage continuously detected within a second detection time period at a second detection frequency is lower than the second voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
detecting a charging state of the lithium battery after starting charging of the lithium battery;
if the lithium battery is in a full state, judging that the lithium battery is not connected or fails;
if the lithium battery is in a zero-voltage state, judging that the lithium battery is in a short circuit;
if the lithium battery is judged to be in fault, the charging of the lithium battery is disconnected;
when detecting that the vehicle-mounted power supply is powered off, disconnecting the charging of the lithium battery to enable the lithium battery to enter a discharging process;
shutting down unnecessary loads and maintaining minimum system operation;
continuously detecting the battery voltage at a fourth detection frequency in the discharging process of the lithium battery; and when the battery voltage continuously detected at the fourth detection frequency is lower than a third voltage threshold, disconnecting the discharge of the lithium battery, and enabling the vehicle-mounted terminal to enter a zero-power-consumption power-off state.
According to some embodiments, the obtaining the battery temperature comprises: and acquiring the internal temperature of the vehicle-mounted terminal micro-control unit as the battery temperature.
According to some embodiments, the aforementioned method further comprises: in the lithium battery charging process, acquiring the battery temperature at a third detection frequency; and if any battery temperature acquired at the third detection frequency is not lower than the charging temperature threshold, the charging of the lithium battery is disconnected.
According to some embodiments, the aforementioned method further comprises: in the lithium battery charging process, acquiring the battery temperature at a third detection frequency; and if the battery temperature acquired at the third detection frequency is within a certain period and the average value of the battery temperature is not lower than the charging temperature threshold, the lithium battery is disconnected from being charged.
According to some embodiments, the aforementioned method further comprises: the second detection duration is greater than the first detection duration.
According to some embodiments, the aforementioned method further comprises: the third voltage threshold is lower than the first voltage threshold.
According to an aspect of the present application, a battery management system for a vehicle-mounted terminal for preventing a lithium battery from failing is provided, which is used in the battery management method according to any one of the foregoing embodiments, and includes a battery charging management unit, a charging switch circuit, a micro control unit, a battery discharging circuit, a battery voltage detection circuit, and a vehicle-mounted power failure detection circuit, wherein:
the voltage input terminal of the battery charging management unit is connected to a charging power supply through the charging switch circuit and provides charging voltage for the lithium battery through the voltage output terminal;
the battery discharge circuit is connected with the lithium battery and a voltage output terminal of a load system;
the battery voltage detection circuit is electrically connected with the lithium battery and outputs a battery voltage signal;
the micro control unit comprises a charging control terminal, a charging detection terminal, a discharging control terminal, a vehicle-mounted power supply control terminal and a battery voltage detection terminal, wherein the charging control terminal outputs a charging control signal to the charging switch circuit, the charging detection terminal inputs a battery charging state detection signal from the battery charging management unit, the discharging control terminal outputs a discharging control signal to the battery discharging circuit, the vehicle-mounted power supply control terminal inputs a vehicle-mounted power supply power-down detection signal from the vehicle-mounted power-down detection circuit, and the battery voltage detection terminal inputs a battery voltage signal from the battery voltage detection circuit.
According to some embodiments, the micro control unit is configured to:
after the vehicle-mounted terminal is started, detecting the voltage of a battery;
if the detected battery voltage is lower than a first voltage threshold value, continuously detecting the battery voltage for a first detection duration at a first detection frequency;
if the battery voltage continuously detected within a first detection time period at a first detection frequency is lower than a first voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, continuously detecting the battery voltage at a second detection frequency for a second detection time period;
and if the battery voltage continuously detected within a second detection time period at a second detection frequency is lower than a second voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery.
According to some embodiments, the aforementioned system further comprises: the voltage input terminal of the battery charge management unit is connected to a charge enable terminal of the battery charge management unit.
According to an aspect of the present application, a vehicle-mounted terminal is provided, which includes the battery management system described above.
According to an aspect of the present application, a vehicle is provided, which includes the vehicle-mounted terminal described above.
According to some embodiments, the battery failure can be identified, and the problems of battery bulge, liquid leakage, explosion and the like are reduced.
According to some embodiments, the vehicle-mounted terminal can be used safely and stably on the battery, the cost is not increased in implementation, and the use risk of the battery in the stock market is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are for illustrative purposes only of certain embodiments of the present application and are not intended to limit the present application.
Fig. 1 illustrates a circuit diagram of a battery management system for an on-vehicle terminal for preventing failure of a lithium battery according to an exemplary embodiment of the present application;
fig. 2 illustrates a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an exemplary embodiment of the present application;
fig. 3 illustrates a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an exemplary embodiment of the present application;
fig. 4 illustrates a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an exemplary embodiment of the present application;
fig. 5 illustrates a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an exemplary embodiment of the present application;
fig. 6 shows a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an example embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments 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, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It will be appreciated by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present application and are, therefore, not intended to limit the scope of the present application.
The application provides a new management method and system for preventing the lithium battery from losing efficacy for a vehicle-mounted terminal, which can realize effective charging and discharging management of the battery, prolong the service life of the battery, identify the battery fault, reduce the problems of battery bulge, liquid leakage, explosion and the like, ensure that the battery is safe and stable in use by using electric equipment, avoid increasing the cost in implementation and reduce the use risk of the battery in the stock market.
The battery management method and the system for preventing the lithium battery from losing efficacy for the vehicle-mounted terminal can be applied to a vehicle provided with the vehicle-mounted terminal using the lithium battery.
In practical use, it can be applied to, for example: a trolley for traveling, a passenger car and a special road vehicle for transporting dangerous chemical substances, fireworks and crackers and the like. When a vehicle runs, data loss in the vehicle-mounted terminal caused by the fact that the power cannot be supplied to the vehicle-mounted terminal after the main power fails due to failure of the lithium battery may occur; or the safety problem of vehicle running caused by the failure and explosion of the lithium battery in the use of the vehicle.
The battery management method and the battery management system for preventing the lithium battery from losing efficacy for the vehicle-mounted terminal can reduce the problem of the vehicle-mounted terminal caused by the lithium battery failure and ensure the safe operation of a vehicle.
Hereinafter, a battery management method and system for preventing a failure of a lithium battery for a vehicle-mounted terminal according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.
Embodiments of apparatus of the present application are described below that may be used to perform embodiments of the methods of the present application. For details not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 1 illustrates a circuit diagram of a battery management system for an on-vehicle terminal for preventing failure of a lithium battery according to an exemplary embodiment of the present application.
Referring to fig. 1, the management system for preventing failure of a lithium battery according to an exemplary embodiment of the present application includes a micro control unit 11, a battery charge management unit 13, a battery voltage detection circuit 15, a vehicle-mounted power failure detection circuit 17, a battery discharge circuit 19, a battery 21, and a charge switch circuit 14.
According to an example embodiment, the charge switch circuit 14 includes: a transistor 141 and a parasitic diode 143; the transistor 141 can be a P-MOS transistor; the source of the transistor 141 is connected with the charging input terminal 231; the gate of the transistor 141 is connected with the charging control terminal 111 in the micro control unit 11; the drain of the transistor 141 is connected to the voltage input 131 of the battery charge management unit 13.
According to an example embodiment, the battery charge management unit 13 comprises: the voltage input terminal 131 is connected to the charge enable terminal 133, the voltage output terminal 135 is connected to the battery 21, and the charge status terminal 137 is connected to the charge detection terminal 113 of the mcu.
According to an exemplary embodiment, the battery voltage detection circuit 15 includes a first resistor 151 and a second resistor 153; one end of the first resistor 151 is connected to one end of the second resistor 153, and is connected to the battery voltage detection terminal 117 of the mcu 11; the other end of the first resistor is connected with the battery 21; the other end of the second resistor 153 is grounded.
According to an example embodiment, the vehicle power failure detection circuit 17 includes: a third resistor 171, a fourth resistor 173, a transistor 175; one end of the third resistor 171 is connected to a power supply, and the other end is connected to the base of the triode 175; one end of the fourth resistor 173 is connected to the base of the triode 175, and the other end is grounded; the transistor 175 may be NPN; the collector of the triode 175 is connected with the vehicle power control terminal 119, and the emitter of the triode 175 is grounded.
According to an example embodiment, the battery discharge circuit 19 comprises: transistor 191 and parasitic diode 193; the transistor 191 comprises a P-MOS tube; the gate of the transistor 191 is connected to the discharge control terminal 115 of the micro control unit 11, the source of the transistor 191 is connected to the battery 21, and the drain of the transistor 191 is connected to the vehicle-mounted terminal system 233.
According to an exemplary embodiment, the micro control unit 11 is configured to:
after the vehicle-mounted terminal is started, detecting the voltage of a battery;
if the detected battery voltage is lower than a first voltage threshold value, continuously detecting the battery voltage for a first detection duration at a first detection frequency;
if the battery voltage continuously detected within a first detection time period at a first detection frequency is lower than a first voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, continuously detecting the battery voltage at a second detection frequency for a second detection time period;
and if the battery voltage continuously detected within a second detection time period at a second detection frequency is lower than a second voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery.
Fig. 2 shows a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an example embodiment of the present application.
At S130, after the vehicle-mounted terminal is started, the battery voltage is detected.
According to an example embodiment, after the in-vehicle terminal is started, the battery charging management unit is turned off, and the battery is not charged by default. The micro control unit detects the battery voltage through a battery voltage detection circuit. The charging frequency of the battery can be effectively reduced, and the service life of the battery is prolonged.
At S131, it is judged whether or not the battery voltage is lower than V1.
According to an example embodiment, the micro control unit determines whether the battery voltage is lower than V1 after detecting the battery voltage through the battery voltage detection circuit. If the battery voltage is lower than V1, go to S1331. If the battery voltage is not lower than V1, go to S1337.
At S1331, the battery voltage is detected for t1 time with the frequency f 1.
According to an example embodiment, in the case where it is detected that the battery voltage is lower than V1, it is necessary to continue to detect the battery voltage at the frequency f1 for the duration t 1.
According to some embodiments, the battery voltage is continuously detected for a first detection duration at a first detection frequency if the detected battery voltage is below a first voltage threshold.
At S1333, it is determined whether or not the battery voltages are all lower than V1.
According to an example embodiment, the battery voltage is detected at a frequency f1 for a duration t 1. If the battery voltage is lower than V1, go to S140. If the detection result is that the battery voltage is not lower than V1, the operation goes to S130.
According to some embodiments, if the battery voltages continuously detected at the first detection frequency for the first detection time period are all lower than the first voltage threshold, the next operation is started.
At S1337, it is determined whether the battery voltage is lower than V2.
According to an example embodiment, the micro control unit determines whether the battery voltage is not lower than V1 and lower than V2 after detecting the battery voltage through the battery voltage detection circuit. If the battery voltage is not lower than V1 and lower than V2, go to S1338. If the battery voltage is not lower than V2, go to S130.
At S1338, the battery voltage is detected for t2 time with the frequency f 2.
According to an example embodiment, after detecting that the battery voltage is not lower than V1 and lower than V2, it is necessary to continue to detect the battery voltage at a frequency of f2 for a duration of t 2.
According to some embodiments, if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, the battery voltage is continuously detected for a second detection period at a second detection frequency.
At S1339, it is determined whether or not the battery voltages are all lower than V2.
According to an example embodiment, the battery voltage is detected at a frequency f2 for a duration t 2. If the battery voltage is lower than V2, go to S140. If the detection result is that the battery voltage is not lower than V2, the operation goes to S130.
According to some embodiments, if the battery voltages continuously detected at the second detection frequency for the second detection time period are all lower than the second voltage threshold, the next operation is started.
According to an example embodiment, the time t1 is shorter than the time t2, the longer the time for continuous detection is, the accuracy is favorably ensured, the time t2 is continuously detected under the condition that the battery voltage is not lower than V1 and lower than V2, the number of times of wrong charging is favorably reduced, the accuracy of starting charging is ensured, and the service life of the battery is prolonged.
At S140, the battery temperature is acquired.
According to an exemplary embodiment, the temperature inside the micro control unit is detected. The internal temperature of the micro control unit can be converted to the battery temperature.
According to some embodiments, the micro control unit internal temperature detected at S140 may be converted to the battery temperature by a formula:
Tbat=Tmcu-△t
wherein T isbatTemperature of the battery, TmcuFor the internal temperature of the micro control unit, Δ t is experimentally found in practical operation.
According to the embodiment of the invention, the battery temperature is obtained through conversion by the micro control unit, a temperature control circuit does not need to be installed in the battery, the detection equipment is simplified, and the battery in the existing market can be continuously and normally used.
At S141, it is judged whether the battery temperature is lower than the recommended charging temperature.
According to an example embodiment, after the internal temperature of the micro control unit is converted according to a formula to obtain the battery temperature, whether the battery temperature is lower than the recommended charging temperature of the battery is judged. If the battery temperature is lower than the recommended battery charging temperature, the process goes to S150. If the battery temperature is not lower than the battery recommended charging temperature, it goes to S130.
At S150, the battery charge management unit is turned on, and the battery is charged.
According to an example embodiment, if the battery voltage meets the charging requirement and the battery temperature is lower than the recommended charging temperature of the battery, the micro control unit controls the charging switch circuit to enable the battery charging management unit to be turned on to charge the battery.
According to some embodiments, the above detection process limits the number of times the battery is charged by detecting the battery voltage in a hierarchical manner, so as to increase the service life of the battery.
Fig. 3 shows a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an example embodiment of the present application.
At S150, the battery charge management unit is turned on, and the battery is charged.
According to an example embodiment, if the battery voltage meets the charging requirement and the battery temperature is lower than the recommended charging temperature of the battery, the micro control unit controls the charging switch circuit to enable the battery charging management unit to be turned on to charge the battery.
In S151, the battery charge state is detected.
According to an exemplary embodiment, the micro control unit detects the battery charge state after starting charging of the battery.
At S1531, it is determined whether the battery is in a full charge state.
According to an exemplary embodiment, the micro control unit detects the battery charge state after starting charging of the battery. If the battery is detected to be in a full state, it represents that the battery is not connected or the battery is dead, and the charging of the battery is not facilitated, the process goes to S155. If the battery is not detected as being in a full state, the process goes to S1533.
At S1533, it is determined whether the battery is in a zero voltage state.
According to an exemplary embodiment, the micro control unit detects the battery charge state after starting charging of the battery. If the zero voltage condition of the battery is detected, which represents a short circuit of the battery, and is not favorable for charging the battery, the process goes to S155. And if the zero voltage state of the battery is not detected, the battery is normally charged.
In S155, the battery charge management unit is turned off, and charging is stopped.
According to an exemplary embodiment, the micro control unit detects the battery charge state after starting charging of the battery. When the battery is detected to be in a full-charge state or a zero-voltage state, which represents a battery fault, the battery charging management unit should be turned off, and the battery charging is stopped.
According to some embodiments, the voltage and the charging state of the battery are detected, the missed battery, the battery short circuit and the battery failure can be identified, the battery state can be better judged, and the risk of battery leakage and explosion caused by charging when the battery is in short circuit and failure fault is avoided, so that the vehicle can run more safely.
At S157, the detection condition is uploaded to the system platform.
According to an exemplary embodiment, the micro control unit detects the battery charge state after starting charging of the battery. When the battery is detected to be in a full-charge state or a zero-voltage state, which represents a battery fault, the battery charging management unit should be turned off, the battery charging is stopped, and the battery fault condition needs to be uploaded to the system platform.
Fig. 4 shows a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an example embodiment of the present application.
Fig. 4 shows a method for detecting an internal temperature by the mcu during the battery charging process.
At S150, the battery charge management unit is turned on, and the battery is charged.
According to an example embodiment, if the battery voltage meets the charging requirement and the battery temperature is lower than the recommended charging temperature of the battery, the micro control unit controls the charging switch circuit to enable the battery charging management unit to be turned on to charge the battery.
In S171, the battery temperature is acquired.
According to an exemplary embodiment, the temperature inside the micro control unit is detected. The internal temperature of the micro control unit can be converted to the battery temperature.
According to some embodiments, the detected internal temperature of the micro control unit is converted into the battery temperature by a formula:
Tbat=Tmcu-△t
wherein T isbatTemperature of the battery, TmcuFor the internal temperature of the micro control unit, Δ t is experimentally found in practical operation.
According to the embodiment of the invention, the battery temperature is obtained through conversion by the micro control unit, a temperature control circuit does not need to be installed in the battery, the detection equipment is simplified, and the battery in the existing market can be continuously and normally used.
At S173, detection is performed at a frequency f 3.
According to an example embodiment, during the charging of the lithium battery, the battery temperature is obtained at a frequency f 3.
According to some embodiments, the battery temperature is obtained at a third detection frequency during charging of the lithium battery.
At S175, it is judged whether or not the battery temperature is not lower than the recommended charging temperature.
According to an example embodiment, after the internal temperature of the micro control unit is converted according to a formula to obtain the battery temperature, whether the battery temperature is not lower than the recommended charging temperature of the battery is judged. If any of the acquired battery temperatures is not lower than the battery recommended charging temperature in the case where the frequency is f3, the flow proceeds to S156.
According to some embodiments, if any one of the battery temperatures acquired at the third detection frequency is not lower than the charging temperature threshold, the charging of the lithium battery is disconnected.
Fig. 5 shows a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an example embodiment of the present application.
Fig. 5 shows a method of detecting an internal temperature by the mcu during the battery charging process.
At S150, the battery charge management unit is turned on, and the battery is charged.
According to an example embodiment, if the battery voltage meets the charging requirement and the battery temperature is lower than the recommended charging temperature of the battery, the micro control unit controls the charging switch circuit to enable the battery charging management unit to be turned on to charge the battery.
In S171, the battery temperature is acquired.
According to an exemplary embodiment, the temperature inside the micro control unit is detected. The internal temperature of the micro control unit can be converted to the battery temperature.
According to some embodiments, the detected internal temperature of the micro control unit is converted into the battery temperature by a formula:
Tbat=Tmcu-△t
wherein T isbatTemperature of the battery, TmcuFor the internal temperature of the micro control unit, Δ t is experimentally found in practical operation.
According to the embodiment of the invention, the battery temperature is obtained through conversion by the micro control unit, a temperature control circuit does not need to be installed in the battery, the detection equipment is simplified, and the battery in the existing market can be continuously and normally used.
At S173, detection is performed at a frequency f 3.
According to an example embodiment, during the charging of the lithium battery, the battery temperature is obtained at a frequency f 3.
According to some embodiments, the battery temperature is obtained at a third detection frequency during charging of the lithium battery.
At S175, it is judged whether or not the battery temperature is not lower than the recommended charging temperature.
According to an example embodiment, after the internal temperature of the micro control unit is converted according to a formula to obtain the battery temperature, whether the battery temperature is not lower than the recommended charging temperature of the battery is judged. If the battery recommended charging temperature is not lower than the frequency f3, the flow goes to S156.
According to some embodiments, if the average value of the battery temperature acquired at the third detection frequency is not lower than the charging temperature threshold value within a certain period, the charging of the lithium battery is disconnected.
Fig. 6 shows a flowchart of a battery management method for an on-vehicle terminal for preventing a failure of a lithium battery according to an example embodiment of the present application.
At S210, a vehicle power down is detected.
According to the exemplary embodiment, when the vehicle-mounted power supply is detected to be powered off at any time after the vehicle-mounted terminal is turned on, the operation goes to the step S231.
At S231, the battery charge management unit is turned off, and the battery charge is stopped.
According to an example embodiment, after detecting that the vehicle-mounted power supply is powered off, the micro control unit turns off the battery charging management unit by controlling the charging switch circuit, stops charging the battery, and goes to S233.
At S233, the battery enters a discharge state.
According to an example embodiment, after detecting that the vehicle-mounted power supply is powered off, the micro control unit turns off the battery charging management unit by controlling the charging switch circuit, stops charging the battery, and turns the battery into a discharging state and goes to S235.
At S235, unnecessary loads are turned off, maintaining minimum system operation.
According to an exemplary embodiment, after the battery enters a discharge state, the micro control unit turns off unnecessary loads, maintains a minimum system operation, and decreases a voltage drop speed of the battery.
At S237, the battery voltage is detected with the frequency f 4.
According to an exemplary embodiment, the battery enters a discharge state, and the mcu will detect the battery voltage via the battery voltage detection circuit at a frequency f 4.
According to some embodiments, the battery voltage is continuously detected at a fourth detection frequency during the discharging of the lithium battery.
At S239, it is determined whether the battery voltage is lower than V3.
According to an example embodiment, the micro control unit detects the battery voltage through a battery voltage detection circuit under the condition of a frequency f4, and judges whether the battery voltage is lower than V3. If the battery voltage is lower than V3, go to S241.
According to some embodiments, the battery voltage is continuously detected at the fourth detection frequency, and if the battery voltage detected at the fourth detection frequency is lower than the third threshold, the next procedure is proceeded to.
According to an example embodiment, the battery voltage is set at V3 and V3 is guaranteed to be lower than V1 in order to protect the battery from over-discharge and damage to the battery.
According to some embodiments, detecting the third threshold of the battery voltage and ensuring that the third threshold is lower than the first voltage threshold can protect the battery from over-discharge and damage to the battery.
In S241, the battery discharge circuit is turned off.
According to an example embodiment, the micro control unit detects the battery voltage through a battery voltage detection circuit under the condition of a frequency f4, and judges whether the battery voltage is lower than V3. If the battery voltage is lower than V3, the battery discharge circuit is closed, and the process goes to S250.
At S250, the in-vehicle terminal enters a zero power consumption power-off state.
According to an example embodiment, the micro control unit detects the battery voltage through a battery voltage detection circuit under the condition of a frequency f4, and judges whether the battery voltage is lower than V3. And if the battery voltage is lower than V3, closing the battery discharge circuit, and enabling the vehicle-mounted terminal to enter a zero-power-consumption power-off state.
The battery management method and the battery management system for preventing the lithium battery from losing efficacy for the vehicle-mounted terminal can reduce the problem of the vehicle-mounted terminal caused by the lithium battery failure and ensure the safe operation of a vehicle.
It should be clearly understood that this application describes how to make and use particular examples, but the application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the method according to exemplary embodiments of the present application, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that the application is not limited to the details of construction, arrangement, or method of implementation described herein; on the contrary, the intention is to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (11)

1. A battery management method for preventing a lithium battery from failing for a vehicle-mounted terminal, comprising:
after the vehicle-mounted terminal is started, detecting the voltage of a battery;
if the detected battery voltage is lower than a first voltage threshold value, continuously detecting the battery voltage for a first detection duration at a first detection frequency;
if the battery voltage continuously detected within a first detection time period at a first detection frequency is lower than the first voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, continuously detecting the battery voltage at a second detection frequency for a second detection time period;
if the battery voltage continuously detected within a second detection time period at a second detection frequency is lower than the second voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
detecting a charging state of the lithium battery after starting charging of the lithium battery;
if the lithium battery is in a full state, judging that the lithium battery is not connected or fails;
if the lithium battery is in a zero-voltage state, judging that the lithium battery is in a short circuit;
if the lithium battery is judged to be in fault, the charging of the lithium battery is disconnected;
when detecting that the vehicle-mounted power supply is powered off, disconnecting the charging of the lithium battery to enable the lithium battery to enter a discharging process;
shutting down unnecessary loads and maintaining minimum system operation;
continuously detecting the battery voltage at a fourth detection frequency in the discharging process of the lithium battery; and when the battery voltage continuously detected at the fourth detection frequency is lower than a third voltage threshold, disconnecting the discharge of the lithium battery, and enabling the vehicle-mounted terminal to enter a zero-power-consumption power-off state.
2. The battery management method of claim 1, wherein the obtaining the battery temperature comprises:
and acquiring the internal temperature of the vehicle-mounted terminal micro-control unit as the battery temperature.
3. The battery management method of claim 1, further comprising:
in the lithium battery charging process, acquiring the battery temperature at a third detection frequency;
and if any battery temperature acquired at the third detection frequency is not lower than the charging temperature threshold, the charging of the lithium battery is disconnected.
4. The battery management method of claim 1, further comprising:
in the lithium battery charging process, acquiring the battery temperature at a third detection frequency;
and if the battery temperature acquired at the third detection frequency is within a certain period and the average value of the battery temperature is not lower than the charging temperature threshold, the lithium battery is disconnected from being charged.
5. The battery management method according to claim 1, wherein:
the second detection duration is greater than the first detection duration.
6. The battery management method according to claim 1, wherein:
the third voltage threshold is lower than the first voltage threshold.
7. A battery management system for a vehicle-mounted terminal for preventing failure of a lithium battery, which is used for the battery management method according to any one of claims 1 to 6, and is characterized by comprising a battery charging management unit, a charging switch circuit, a micro control unit, a battery discharging circuit, a battery voltage detection circuit and a vehicle-mounted power failure detection circuit, wherein:
the voltage input terminal of the battery charging management unit is connected to a charging power supply through the charging switch circuit and provides charging voltage for the lithium battery through the voltage output terminal;
the battery discharge circuit is connected with the lithium battery and a voltage output terminal of a load system;
the battery voltage detection circuit is electrically connected with the lithium battery and outputs a battery voltage signal;
the micro control unit comprises a charging control terminal, a charging detection terminal, a discharging control terminal, a vehicle-mounted power supply control terminal and a battery voltage detection terminal, wherein the charging control terminal outputs a charging control signal to the charging switch circuit, the charging detection terminal inputs a battery charging state detection signal from the battery charging management unit, the discharging control terminal outputs a discharging control signal to the battery discharging circuit, the vehicle-mounted power supply control terminal inputs a vehicle-mounted power supply power-down detection signal from the vehicle-mounted power-down detection circuit, and the battery voltage detection terminal inputs a battery voltage signal from the battery voltage detection circuit.
8. The battery management system of claim 7, wherein the micro-control unit is configured to:
after the vehicle-mounted terminal is started, detecting the voltage of a battery;
if the detected battery voltage is lower than a first voltage threshold value, continuously detecting the battery voltage for a first detection duration at a first detection frequency;
if the battery voltage continuously detected within a first detection time period at a first detection frequency is lower than a first voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery;
if the detected battery voltage is not lower than the first voltage threshold and lower than the second voltage threshold, continuously detecting the battery voltage at a second detection frequency for a second detection time period;
and if the battery voltage continuously detected within a second detection time period at a second detection frequency is lower than a second voltage threshold, acquiring the battery temperature, and if the battery temperature is lower than a charging temperature threshold, starting charging of the lithium battery.
9. The battery management system of claim 7, wherein:
the voltage input terminal of the battery charge management unit is connected to a charge enable terminal of the battery charge management unit.
10. A vehicle-mounted terminal characterized by comprising:
having a battery management system according to any of claims 7-9.
11. A vehicle, characterized by comprising:
the in-vehicle terminal according to claim 10 is mounted.
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CN202260648U (en) * 2011-10-12 2012-05-30 深圳市超思维电子有限公司 Energy-storage power supply management system for communication base station
CN104852441B (en) * 2015-06-12 2017-04-12 安徽江淮汽车集团股份有限公司 Vehicle-mounted charging control method for lithium battery pack
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