CN111463873A - Battery monitoring method, battery management system and battery management equipment - Google Patents
Battery monitoring method, battery management system and battery management equipment Download PDFInfo
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- CN111463873A CN111463873A CN202010570820.XA CN202010570820A CN111463873A CN 111463873 A CN111463873 A CN 111463873A CN 202010570820 A CN202010570820 A CN 202010570820A CN 111463873 A CN111463873 A CN 111463873A
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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
- 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
- H02J7/0032—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 disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
Abstract
The embodiment of the invention provides a battery monitoring method, a battery management system and battery management equipment. Thereby the direct current voltage reduction unit is based on self-awakening information and is awaken up to BMS output enable information after awakening up, so that BMS opens and carries out monitoring work, realizes the monitoring to electric automobile power battery under the whole car power-off state.
Description
Technical Field
The embodiment of the invention relates to the field of batteries, in particular to a battery monitoring method, a battery management system and battery management equipment.
Background
With the rapid development of the new energy industry, safety accidents of electric automobile power supplies occur more and more frequently in the visual field of the public.
Under the driving or charging condition of the electric vehicle, a Battery Management System (BMS) can monitor a power Battery of the electric vehicle.
Under the condition that the whole electric automobile is powered off or placed for a long time, the power battery has potential safety hazards due to the influence of factors such as external environment, the characteristics of the power battery and the like, and therefore effective monitoring needs to be provided for the power battery of the electric automobile.
Disclosure of Invention
In order to solve the technical problem, embodiments of the present invention provide a battery monitoring method, a battery management system, and a battery management device, so as to implement monitoring of a power battery of an electric vehicle in a power-off state of the entire vehicle, and further improve the safety of the entire vehicle.
In a first aspect of the embodiments of the present invention, a battery monitoring method is provided, which includes:
based on an enabling signal, a Battery Management System (BMS) is started, wherein the enabling signal is sent to the BMS by a direct current voltage reduction unit based on self-awakening information, and the self-awakening information is sent to the direct current voltage reduction unit by the BMS before power-off;
the BMS detects state parameters of a battery, the state parameters including: a voltage of a cell in the battery and a load State (SOC) of the battery;
when the conditions are met, the BMS sends the self-awakening information to the direct current voltage reduction unit, the BMS is powered off, and the self-awakening information comprises the self-awakening time after the direct current voltage reduction unit is dormant;
wherein the conditions include: the SOC of the battery is greater than a lowest SOC threshold value of the battery and a minimum cell voltage is greater than a cell voltage threshold value.
Optionally, the sending, by the BMS, the self-wakeup information to the dc voltage reduction unit includes:
and when the key-on signal of the whole vehicle is not detected and the output signal of the charging auxiliary power supply is not detected, the BMS sends the self-awakening information to the direct current voltage reduction unit.
Optionally, the self-wakeup information further includes: the self-awakening duration of the DC voltage reduction unit after dormancy.
Optionally, the self-wakeup information further includes: a self-wake-up mode;
the self-wake-up mode comprises: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to the time and the duration period after being dormant;
and when the self-awakening mode is a single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to the time and the duration after being dormant.
Optionally, the BMS detecting the state parameter of the battery further includes detecting a temperature of the battery;
the conditions further include:
the temperature of the battery is less than the maximum temperature threshold of the cell.
Optionally, the method further includes:
and when the temperature of the battery is greater than or equal to the highest temperature threshold of the battery core, the BMS sends out abnormal battery temperature alarm information and prohibits the direct current voltage reduction unit from sleeping.
Optionally, the method further includes:
and when the SOC of the battery is less than or equal to the lowest SOC threshold value of the battery or the minimum cell voltage is less than or equal to the cell voltage threshold value, sending out battery under-voltage alarm information and forbidding the direct current voltage reduction unit to sleep.
Optionally, the sending, by the BMS, the self-wakeup information to the dc voltage reduction unit includes:
the BMS sets the self-awakening information based on the state parameters;
and the BMS sends the self-awakening information to the direct current voltage reduction unit.
Optionally, the self-wakeup information is carried by a Controller Area Network (CAN) message.
In a second aspect of an embodiment of the present invention, there is provided a Battery Management System (BMS), including:
the system comprises an enabling unit, a direct current voltage reducing unit and a transmitting and receiving unit, wherein the enabling unit is used for enabling the BMS to be started based on an enabling signal, the enabling signal is sent to the BMS by the direct current voltage reducing unit based on self-awakening information, and the self-awakening information is sent to the direct current voltage reducing unit by the BMS through the transmitting and receiving unit before power is cut off;
a detection unit for detecting a state parameter of the battery, the state parameter including: a voltage of a cell in the battery and a load State (SOC) of the battery;
the processing unit is used for sending the self-awakening information to the direct current voltage reduction unit through the transceiving unit and powering down the BMS when the following conditions are met, wherein the self-awakening information comprises the self-awakening time after the direct current voltage reduction unit is dormant;
wherein the conditions include: the SOC of the battery is greater than a lowest SOC threshold value of the battery and a minimum cell voltage is greater than a cell voltage threshold value.
Optionally, the detection unit is further configured to detect a vehicle key unlock signal and/or a charging auxiliary power supply output signal;
the processing unit is configured to: and when the detection unit does not detect a key opening signal of the whole vehicle and also does not detect an output signal of the charging auxiliary power supply, the self-awakening information is sent to the direct current voltage reduction unit through the transceiving unit.
Optionally, the processing unit is configured to send the self-wakeup information to the dc voltage reduction unit through the transceiver unit; the self-wakeup information further includes: the self-awakening duration of the DC voltage reduction unit after dormancy.
Optionally, the processing unit is configured to send the self-wakeup information to the dc voltage reduction unit through the transceiver unit; the self-wakeup information further includes: a self-wake-up mode;
the self-wake-up mode comprises: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to the time and the duration period after being dormant;
and when the self-awakening mode is a single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to the time and the duration after being dormant.
Optionally, the detection unit is further configured to detect a temperature of the battery;
the processing unit is configured to: when the condition is met, sending the self-awakening information to the direct current voltage reduction unit, wherein the condition further comprises: the temperature of the battery is less than the maximum temperature threshold of the cell.
Optionally, the processing unit is further configured to:
and when the temperature of the battery is greater than or equal to the highest temperature threshold of the battery core, sending out abnormal battery temperature alarm information and forbidding the direct current voltage reduction unit from sleeping.
Optionally, the processing unit is further configured to:
and when the SOC of the battery is less than or equal to the lowest SOC threshold value of the battery or the minimum cell voltage is less than or equal to the cell voltage threshold value, sending out battery under-voltage alarm information and forbidding the direct current voltage reduction unit to sleep.
Optionally, the processing unit is further configured to: setting the self-awakening information based on the state parameter.
In a third aspect of the embodiments of the present invention, there is provided a battery management apparatus, including: a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, is capable of implementing the battery monitoring method as provided above in the first aspect of the embodiments of the present invention.
In a fourth aspect of the embodiments of the present invention, a battery monitoring method is provided, which includes:
the method comprises the steps that a direct current voltage reduction unit receives self-awakening information sent by a Battery Management System (BMS), wherein the self-awakening information comprises self-awakening time after the direct current voltage reduction unit is dormant;
when the whole vehicle key starting signal is not detected and the charging auxiliary power supply output signal is not detected, the direct current voltage reduction unit starts a timer based on the self-awakening information and conducts dormancy, and the timer conducts timing based on the self-awakening time after the direct current voltage reduction unit conducts dormancy;
if the timer reaches the self-awakening time after the DC voltage reduction unit is dormant, the DC voltage reduction unit is self-awakened and starts output;
the direct current voltage reduction unit sends an enable signal to the BMS so that the BMS is turned on.
Optionally, the self-wake-up information further includes a self-wake-up duration after the dc voltage reduction unit is dormant.
Optionally, the receiving, by the dc voltage reduction unit, the self-wake-up information sent by the battery management system further includes receiving, by the dc voltage reduction unit, a self-wake-up mode sent by the battery management system;
the self-wake-up mode comprises: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to the time and the duration period after being dormant;
and when the self-awakening mode is a single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to the time and the duration after being dormant.
In a fifth aspect of the embodiments of the present invention, there is provided a battery monitoring device, where the battery monitoring device is a dc voltage reduction unit, and the battery monitoring device includes:
a receiving unit, configured to receive self-awakening information sent by a Battery Management System (BMS), where the self-awakening information includes a time for self-awakening after the dc voltage reduction unit is dormant;
the control unit is used for starting a timer based on the self-awakening information and controlling the direct current voltage reduction unit to be dormant when a whole vehicle key starting signal is not detected and a charging auxiliary power supply output signal is not detected, and the timer counts time based on the self-awakening time after the direct current voltage reduction unit is dormant;
the wake-up unit is used for judging whether the timer reaches the self-wake-up time after the DC voltage reduction unit is dormant, and if the timer reaches the self-wake-up time after the DC voltage reduction unit is dormant, the DC voltage reduction unit is self-woken up and starts to output;
and a transmitting unit for transmitting an enable signal to the BMS to turn on the BMS.
Optionally, the receiving unit is configured to receive self-awakening information sent by the battery management system, where the self-awakening information further includes a self-awakening duration after the dc voltage reduction unit is dormant.
Optionally, the receiving unit is configured to receive self-awakening information sent by the battery management system, where the self-awakening information further includes a self-awakening mode sent by the battery management system and received by the dc voltage reducing unit;
the self-wake-up mode comprises: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to the time and the duration period after being dormant;
and when the self-awakening mode is a single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to the time and the duration after being dormant.
In a sixth aspect of the embodiments of the present invention, there is provided a dc voltage reducing device, including: a memory and a processor, wherein the memory stores a computer program, and the computer program can realize the battery monitoring method provided by the fourth aspect of the embodiment of the present invention when being executed by the processor.
In a seventh aspect of the embodiments of the present invention, there is provided a storage medium including: the storage medium has stored therein a computer program which, when executed by a processor, is capable of implementing the battery monitoring method as provided in the first aspect of the embodiment of the present invention or the battery monitoring method as provided in the fourth aspect of the embodiment of the present invention.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the battery monitoring method, the battery management system, the battery management equipment, the battery monitoring device, the direct current voltage reduction equipment and the storage medium of the embodiment of the invention, the BMS is started based on the enabling signal, and detects the state parameters of the battery, such as the voltage of a battery cell in the battery and the load state SOC of the battery, when the SOC of the battery is greater than the lowest SOC threshold value of the battery and the minimum cell voltage is greater than the cell voltage threshold value, the BMS sends the self-awakening information to the direct current voltage reduction unit and the BMS is powered down, wherein the enabling signal is that the direct current voltage reduction unit sends the BMS based on the self-awakening information sent by the direct current voltage reduction unit to. Therefore, under the power-off state, the BMS can be started through the direct-current voltage reduction unit based on an enabling signal sent before the BMS powers off, the monitoring of the power battery of the electric automobile under the power-off state of the whole automobile is realized, and the all-weather monitoring of the power battery of the electric automobile can be further realized.
Drawings
The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. Wherein the included drawings are:
fig. 1 shows a structure diagram of a vehicle control system provided in an embodiment of the invention;
fig. 2 is a schematic flow chart illustrating a battery monitoring method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a battery monitoring method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a battery monitoring method for interaction between the BMS and the dc voltage reduction unit according to an embodiment of the present invention;
FIG. 5 is an interaction diagram illustrating a battery monitoring method provided by an embodiment of the invention;
fig. 6 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a battery monitoring device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a battery management device according to an embodiment of the present invention;
fig. 9 shows a schematic structural diagram of a dc voltage reduction device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the embodiments of the present invention is provided with the accompanying drawings and embodiments, so that how to apply the technical solutions to solve the technical problems and achieve the technical effects can be fully understood and implemented.
With the rapid development of the new energy industry, safety accidents of electric automobile power supplies occur more and more frequently in the visual field of the public.
Under the driving or charging condition of the electric vehicle, a Battery Management System (BMS) can monitor a power Battery of the electric vehicle.
Under the condition that the whole electric automobile is powered off or placed for a long time, the power battery has potential safety hazards due to the influence of factors such as external environment, the characteristics of the power battery and the like, and therefore effective monitoring needs to be provided for the power electric vehicle of the electric automobile.
In view of the above, the present invention provides a battery monitoring method, a battery management system, a battery management device, a battery monitoring apparatus, a dc voltage reduction device, and a storage medium, where a BMS turns on based on an enable signal and detects state parameters of a battery, such as a voltage of a cell in the battery and a load state of the battery, and when a condition is satisfied: when the SOC of the battery is greater than the lowest SOC threshold value of the battery and the minimum cell voltage is greater than the cell voltage threshold value, the BMS sends self-awakening information to the direct current voltage reduction unit and the BMS is powered down, wherein the enabling signal is that the direct current voltage reduction unit sends the BMS based on the self-awakening information sent to the direct current voltage reduction unit before the BMS is powered down. Therefore, when the SOC and the minimum cell voltage of the battery meet the conditions, the BMS can send self-awakening information including self-awakening time after the dormancy of the DC voltage reduction unit to the DC voltage reduction unit, then the DC voltage reduction unit can be enabled to be automatically awakened based on the time in the self-awakening information, and the BMS is sent with enabling information after awakening, so that the BMS is started, the monitoring of the power battery of the electric automobile under the power-off state of the whole automobile is realized, and the safety of the whole automobile is further improved.
First, a structure of a Vehicle Control system based on the present invention is introduced, and referring to fig. 1, fig. 1 shows a structure diagram of the Vehicle Control system provided by the present invention, wherein the structure diagram mainly includes a battery pack, a BMS, a dc voltage reduction Unit, a Vehicle Control Unit (VCU), a Motor Control Unit (MCU), a storage battery, and other low voltage loads of the Vehicle. The battery pack is used for supplying power to the whole vehicle; the direct current voltage reduction unit has a direct current voltage transformation function, and the direct current voltage reduction unit and the storage battery can supply power for BMS, VCU and other low-voltage loads; the BMS is mainly used to monitor the operating state of the battery, such as the voltage, temperature, SOC, etc., of the battery; the VCU CAN coordinate and control other controllers and low-voltage relays by receiving messages sent by the BMS, the MCU is a core unit for controlling the whole vehicle, CAN communicate with other controllers through a CAN and is responsible for sampling, external hardware signals such as an accelerator pedal and the like, the VCU CAN control the working state of the electric vehicle by disconnecting the MCU low-voltage power supply and sending an enabling command, and CAN forward the acquired information to a remote monitoring platform to realize remote monitoring of the battery.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a battery monitoring method according to an embodiment of the present invention, which includes steps S101 to S103:
in step S101, the BMS turns on based on the enable signal.
The enabling signal is sent to the BMS by the direct current voltage reduction unit based on the self-awakening information, and the self-awakening information is sent to the direct current voltage reduction unit by the BMS before power is down.
In step S102, the BMS detects state parameters of the battery, the state parameters including: the voltage of a cell in the battery and the load State (SOC) of the battery.
In step S103, when the SOC of the battery is greater than the lowest SOC threshold of the battery and the minimum cell voltage is greater than the cell voltage threshold, the BMS sends a self-wake-up message to the dc voltage dropping unit and the BMS powers down.
The self-awakening information comprises self-awakening time after the direct current voltage reduction unit is dormant.
In the scheme provided by the embodiment of the invention, when the condition is met: when the SOC of battery is greater than the minimum SOC threshold value of battery and minimum core voltage is greater than the core voltage threshold value, BMS can send the self-awakening information including the time of self-awakening after the dormancy of DC voltage reduction unit to DC voltage reduction unit, and BMS power down, and then, can make DC voltage reduction unit carry out self-awakening based on the time in the self-awakening information, and after awakening up send the enabling information to BMS, so that BMS opens, realize the control to electric automobile power battery under the whole car power state, whole car security has further been improved.
Referring to fig. 3, fig. 3 is a schematic flow chart of another battery monitoring method according to an embodiment of the present invention, which includes steps S201 to S204:
in step S201, the dc voltage reduction unit receives self-wakeup information sent by the BMS.
In an embodiment of the present invention, the self-wake-up information may include a time for self-wake-up after the dc voltage reduction unit is dormant.
In step S202, when neither the vehicle key on signal nor the charging auxiliary power output signal is detected, the dc voltage reduction unit starts a timer based on the self-wakeup information and sleeps.
Specifically, the timer is used for timing based on the self-awakening time after the direct current voltage reduction unit is dormant.
In step S203, if the timer counts the time of self-waking up after the dc voltage reduction unit is dormant, the dc voltage reduction unit self-wakes up and starts outputting.
In step S204, the dc voltage dropping unit transmits an enable signal to the BMS to turn on the BMS.
The above is another battery monitoring method provided by the embodiment of the present invention, which is applied to a dc voltage reducing unit with a timing function, the dc voltage reducing unit receives self-awakening information sent by a BMS, when neither a vehicle key start signal nor a charging auxiliary power output signal is detected, the dc voltage reducing unit starts a timer based on the self-awakening information and performs sleep, the timer performs timing based on a self-awakening time after the dc voltage reducing unit is in the sleep, and when the timer reaches the self-awakening time after the dc voltage reducing unit is in the sleep, the dc voltage reducing unit self-awakens and starts output, and sends an enable signal to the BMS, thereby triggering the BMS to start. And then can realize the control to electric automobile power battery under the whole car state of cutting off the electricity, further improved whole car security.
The embodiments provided by the present invention will be described below with respect to the interaction process of the BMS and the dc voltage reduction unit.
Referring to fig. 4 and 5, fig. 4 is a flowchart illustrating a battery monitoring method in which a BMS interacts with a dc voltage reduction unit, and fig. 5 is an interaction diagram illustrating a battery monitoring method according to an embodiment of the present invention.
Step S401: based on the enable signal, the BMS turns on.
Step S402: the BMS detects a state parameter of the battery.
When the status parameter satisfies the condition, step S403 to step S407 are performed.
Step S403: the BMS sends self-awakening information to the direct current voltage reduction unit and the BMS is powered down.
Step S404: and the direct current voltage reduction unit receives self-awakening information sent by the BMS.
Step S405: when the whole vehicle key opening signal is not detected and the charging auxiliary power supply output signal is not detected, the direct current voltage reduction unit starts the timer based on the self-awakening information and sleeps.
Step S406: if the timer counts the time of self-awakening after the DC voltage reduction unit is dormant, the DC voltage reduction unit is self-awakened and starts output.
Step S407: the dc voltage dropping unit sends an enable signal to the BMS to turn on the BMS, and returns to perform step S401.
In step S401, the enabling signal is sent by the dc voltage reducing unit to the BMS based on self-wake-up information sent by the BMS to the dc voltage reducing unit before powering down, wherein the self-wake-up information may include a time for the dc voltage reducing unit to wake up after sleeping.
As an example, the self-wake-up information may further include a self-wake-up duration after the dc voltage reduction unit is dormant, the dc voltage reduction unit may perform self-wake-up based on the self-wake-up time and duration in the self-wake-up information, and send an enable signal to the BMS after the self-wake-up, as a specific example, the self-wake-up time is 2 o 'clock 10 minutes, and the duration is 5 minutes, and then based on the wake-up information, the dc voltage reduction unit may automatically wake up at 2 o' clock 10 minutes, and keep waking up for 5 minutes, and the preset duration of the wake-up can improve the validity of the detection data.
As another example, the self-wake-up information may include a self-wake-up mode in addition to the time and duration of self-wake-up, wherein the self-wake-up mode may include: periodic mode and single shot mode. For example, based on the specific example provided above, the self-wakeup mode may include a self-wakeup time "2 o 10 min", a self-wakeup time "5 minutes", and a period "5 times within 1 hour", and then the dc voltage reduction unit performs the first wakeup for 2 o 10 min, and wakes up for 5 times within one hour from 2 o 10 to 3 o 10, and each wakeup time has a duration of 5 minutes. The periodic wake-up mode can improve the frequency of enabling signals sent by the direct current voltage reduction unit to the BMS, so that the frequency of detecting the battery state of the BMS is improved, and the monitoring capability of the battery state is effectively improved.
In step S402, as an example, the BMS detecting the state parameter of the battery may include detecting a voltage of a cell in the battery and a SOC of the battery, the SOC may be used to represent a remaining power of the battery, and the BMS may know a state of health of the battery by detecting the voltage of the cell in the battery and the load state SOC of the battery.
As another example, the BMS may further detect a temperature of the battery, and by detecting the temperature of the battery, it may be monitored whether the battery is at an excessively high temperature, thereby enabling monitoring of various relevant parameters of the battery.
In the embodiment provided by the invention, when the BMS detects the state parameter of the battery, including detecting the voltage of the battery cell in the battery and the SOC of the battery, the condition that the state parameter needs to satisfy may include: the SOC of the battery is greater than the lowest SOC threshold value of the battery and the minimum cell voltage is greater than the cell voltage threshold value; when the BMS detects the state parameter of the battery may further include detecting a temperature of the battery, the condition that the state parameter needs to satisfy may further include: the temperature of the battery is less than the maximum temperature threshold of the cell. By judging whether the SOC of the battery, the minimum cell voltage and the temperature of the battery meet the conditions or not, the health state of the battery can be comprehensively monitored, and when the temperature of the battery is monitored to be overhigh, early warning can be made conveniently and timely.
In step S403, when the vehicle key-on signal is not detected and the charging auxiliary power output signal is not detected, the BMS sends a self-wake-up message to the dc voltage step-down unit. The whole vehicle key opening signal can be called a Keyon signal and is used for indicating the BMS to start work and enter a driving state; the charging auxiliary power supply outputs a signal, which can also be called as a charging gun A + signal, and is used for indicating the charging state of the whole vehicle. Correspondingly, when a key opening signal of the whole vehicle is not detected and an output signal of the charging auxiliary power supply is not detected, the power-off mode of the whole vehicle is corresponded.
And under the power-off mode of the whole vehicle, the BMS sends self-awakening information to the direct current voltage reduction unit when the sending condition is met. In this embodiment of the present invention, the step S403 may specifically be: the BMS sets self-awakening information based on the state parameters; the BMS sends self-awakening information to the direct current voltage reduction unit. As a specific example, the cell voltage threshold is 10V, the minimum cell voltage detected by the BMS is 9.5V, and the detected voltage is relatively high in a normal state, so that an abnormal battery voltage may occur.
It should be noted that, the BMS sets the self-wakeup information based on the state parameter, where the self-wakeup information may be the same as the self-wakeup information based on the enable signal in step S401, or may be different from the self-wakeup information based on the enable signal in step S401, and specifically, may reset at least one of the self-wakeup time, the self-wakeup duration, and the self-wakeup mode in the self-wakeup information according to the real-time state parameter and the actual requirement.
In addition, the self-wakeup information provided in the embodiment of the present invention may further include a field for allowing or prohibiting the dc voltage reduction unit from sleeping. The self-awakening information CAN be carried by a Controller Area Network (CAN) message, and when the state parameter of the battery meets a condition, the CAN message CAN be used for sending the awakening information including at least one of the self-awakening time length, the self-awakening mode and the permission/prohibition sleep field of the direct current voltage reduction unit and the self-awakening time to the direct current voltage reduction unit.
In step S404, the dc voltage reducing unit receives self-wake-up information sent by the BMS, where the self-wake-up information may include a time for the dc voltage reducing unit to wake up after sleeping, and may further include at least one of a duration and a self-wake-up mode.
In step S405, when the vehicle key on signal is not detected and the charging auxiliary power output signal is not detected, the dc voltage reduction unit starts a timer based on the self-wakeup information and performs a sleep, and the timer performs timing based on the self-wakeup time after the dc voltage reduction unit is in the sleep.
When the whole vehicle key opening signal is not detected and the charging auxiliary power supply output signal is not detected, the power-off state of the whole vehicle can be judged.
As an example, when neither the vehicle key-on signal nor the charging auxiliary power output signal is detected, the BMS may send a self-wake-up message including a field allowing the dc voltage reduction unit to sleep to the dc voltage reduction unit to control the dc voltage reduction unit to sleep.
In step S406, when the timer reaches the self-wake-up time after the dc voltage reduction unit is dormant, the dc voltage reduction unit self-wakes up and starts outputting. If the self-awakening information further comprises the self-awakening time length and/or the self-awakening mode of the DC voltage reduction unit after the DC voltage reduction unit is dormant, the DC voltage reduction unit awakens and starts to output according to the corresponding self-awakening time length and/or the corresponding self-awakening mode. Therefore, the direct current voltage reduction unit can realize automatic awakening in the power-down mode, and flexibly select awakening time length, modes and the like according to requirements.
In step S407, the dc voltage reduction unit sends an enable signal to the BMS after the automatic wake-up is achieved. The BMS may then return to perform step S401, i.e., the BMS turns on based on the enable signal to perform detection of the battery state parameter. That is, in a power-off state of the entire vehicle, the BMS enters a duty cycle based on an enable signal of the dc voltage reduction unit. In the duty cycle, the BMS detects the battery state parameter, and if the battery state parameter is normal, the BMS sends the self-awakening information to the DC voltage reduction unit before powering down and powers down. When the direct current voltage reduction unit does not detect the keyon signal nor the auxiliary power supply output signal that charges, based on the information of waking up certainly that the BMS sent, the direct current voltage reduction unit gets into the dormancy state to start the timer based on the information of waking up certainly, the timer is based on the time of waking up certainly behind the direct current voltage reduction unit dormancy and is timed. When the timer reaches the time of self-awakening after the dormancy of the direct current voltage reduction unit, the direct current unit is self-awakened, the direct current voltage reduction unit outputs an enabling signal to the BMS, and the BMS enters the next working cycle based on the enabling signal of the direct current voltage reduction unit and repeats.
When the state parameter of the battery does not meet the condition, optionally, when the temperature of the battery is greater than or equal to the maximum temperature threshold of the battery core, the BMS sends out abnormal battery temperature alarm information and prohibits the direct current voltage reduction unit from sleeping.
Optionally, when the SOC of the battery is less than or equal to the minimum SOC threshold of the battery or the minimum cell voltage is less than or equal to the cell voltage threshold, the BMS sends out an under-voltage battery warning message and prohibits the dc voltage reduction unit from sleeping.
In the embodiment of the present invention, the step of prohibiting the dc voltage reduction unit from sleeping may be: when the state parameters of the battery meet the conditions and are not in a power-off state, the BMS sends self-awakening information containing a field for prohibiting the sleep of the direct current voltage reduction unit to the direct current voltage reduction unit so as to prohibit the sleep of the direct current voltage reduction unit; the method can also comprise the following steps: when the state parameter of the battery does not meet the condition, the BMS does not send the self-awakening information to the direct current voltage reduction unit, so that the direct current voltage reduction unit is forbidden to sleep.
Optionally, in step S407, after the dc voltage reduction unit is self-awakened, the BMS may be awakened, and the VCU may also be awakened, when the BMS detects that the battery temperature is abnormal, the abnormal temperature alarm information is sent to the VCU through the CAN bus, and the VCU may further forward the abnormal temperature alarm information obtained by the VCU to the remote monitoring platform, so that the battery cell may detect and report the battery fault in time when the battery cell is in a short circuit or the like. Similarly, the BMS CAN also send the battery under-voltage alarm information to the VCU through the CAN bus so as to further send the battery under-voltage alarm information to the remote monitoring platform, thereby realizing the remote monitoring of the battery.
In addition, when the temperature is abnormal and/or the battery is under-voltage, the direct current voltage reduction unit is forbidden to sleep, the electric automobile can be ensured to be safely parked under the power-off state of the whole automobile, the situation that the service life of the battery is continuously under-voltage and the damage to the battery is caused due to the fact that the direct current voltage transformation unit is used under the condition that the battery is extremely low in SOC can be avoided, and the thermal runaway danger is avoided.
In addition, under the driving state, the BMS starts and detects the voltage of the battery cell in the battery and the SOC of the battery based on the Keyon signal, and if the current minimum cell voltage is smaller than the cell voltage threshold value X1Or the current SOC is less than the lowest SOC threshold Y of the battery1The BMS sends an alarm message to the VCU of the whole vehicle to request to disconnect a related relay; if the current minimum cell voltage is more than or equal to the cell voltage threshold value X1And the current SOC is more than or equal to the lowest SOC threshold value Y of the battery1BMS collects the temperature of the battery in real time, and when the temperature of the battery is larger than a temperature threshold value Z1And the BMS sends out a temperature abnormity alarm to the whole vehicle controller to request high-voltage power-down. After the VCU receives the alarm signal from the BMS, the relay is turned off to limit the power of the whole vehicle, and the alarm signal can be sent to a remote monitoring platform, so that the battery in a driving state can be monitored.
In a charging state, the BMS starts and detects the voltage of a cell in the battery and the SOC of the battery based on an output signal of the charging auxiliary power supply, and if the current minimum cell voltage is greater than a cell voltage threshold value X2And the current SOC is greater than the threshold value Y of the cut-off SOC2Stopping charging; in addition, the BMS can also detect the temperature of the battery in the charging process, and when the BMS detects that the highest cell temperature is greater than a temperature threshold value Z2And the average temperature of all the battery cells in the battery pack is higher than that under the current conditionNormal temperature threshold value Z0And the BMS sends out an abnormal temperature alarm to the whole vehicle controller, and if the battery core temperature is a normal value, the BMS executes a normal battery thermal management strategy.
Therefore, the battery monitoring under the driving state, the charging state and the power-off state of the whole vehicle is realized, and the effect of monitoring and protecting the battery in all weather is achieved.
Correspondingly, the embodiment of the invention also provides a Battery Management System (BMS) which is used for executing the battery monitoring method applied to the BMS in the embodiment.
Referring to fig. 6, fig. 6 is a schematic structural diagram illustrating a battery management system according to an embodiment of the present invention, including:
the enabling unit 61 is used for enabling the BMS to be started based on an enabling signal, the enabling signal is sent to the BMS by the direct current voltage reduction unit based on self-awakening information, and the self-awakening information is sent to the direct current voltage reduction unit by the BMS through the receiving and sending unit before power is cut off;
a detecting unit 62 for detecting a state parameter of the battery, the state parameter including: the voltage of a battery cell in the battery and the load State (SOC) of the battery;
the processing unit 63 is configured to send self-awakening information to the dc voltage reduction unit through the transceiver unit and power down the BMS when the following conditions are met, where the self-awakening information includes self-awakening time after the dc voltage reduction unit is dormant;
wherein the conditions include: the SOC of the battery is greater than a lowest SOC threshold value of the battery and the minimum cell voltage is greater than a cell voltage threshold value.
The detection unit 62 is further configured to detect a key-on signal of the entire vehicle and/or an output signal of the charging auxiliary power supply;
as an example, the processing unit 63 is configured to: when the detection unit 62 does not detect the key-on signal of the whole vehicle and does not detect the output signal of the charging auxiliary power supply, the self-awakening information is sent to the direct current voltage reduction unit through the transceiving unit.
As an example, the processing unit 63 is configured to send self-wakeup information to the dc voltage reduction unit through the transceiving unit; the self-wakeup information further includes: the self-awakening time length after the direct current voltage reduction unit is dormant.
As an example, the processing unit 63 is configured to send self-wakeup information to the dc voltage reduction unit through the transceiving unit; the self-wakeup information further includes: a self-wake-up mode;
the self-wake-up mode includes: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to time and duration periods after being dormant;
when the self-awakening mode is the single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to time and duration after being dormant.
As an example, the detection unit 62 is also used for detecting the temperature of the battery;
the processing unit 63 is configured to: when the condition is met, sending self-awakening information to the direct current voltage reduction unit, wherein the condition further comprises: the temperature of the battery is less than the maximum temperature threshold of the cell.
As an example, the processing unit 63 is further configured to: and when the temperature of the battery is greater than or equal to the highest temperature threshold of the battery core, sending out abnormal battery temperature alarm information and forbidding the direct current voltage reduction unit from sleeping.
As an example, the processing unit 63 is further configured to: and when the SOC of the battery is less than or equal to the lowest SOC threshold value of the battery or the minimum cell voltage is less than or equal to the cell voltage threshold value, sending out an under-voltage warning message of the battery and forbidding the direct current voltage reduction unit from sleeping.
As an example, the processing unit 63 is further configured to: setting self-awakening information based on the state parameter.
The above battery management system provided for the embodiment of the present invention includes an enabling unit 61, a detecting unit 62, and a processing unit 63, and is configured to, based on an enabling signal, turn on and detect state parameters of a battery, such as the voltage of a cell in the battery and the load state of the battery, and when the SOC of the battery is greater than a minimum SOC threshold value of the battery and the minimum cell voltage is greater than a cell voltage threshold value, send a self-wake-up message to a dc voltage reducing unit and power down the BMS. And then can make the direct current voltage reduction unit carry out the self-awakening based on the time in the self-awakening information to BMS sends the enabling information after awakening up, so that BMS opens, realizes the control to electric automobile power battery under the whole car power-off state, has further improved whole car security.
Correspondingly, the embodiment of the invention also provides a battery monitoring device which is a direct-current voltage reduction unit.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a battery monitoring device according to an embodiment of the present invention, which includes:
a receiving unit 71, configured to receive self-wakeup information sent by a Battery Management System (BMS), where the self-wakeup information includes a time for self-wakeup after a dc voltage reduction unit is dormant;
the control unit 72 is used for starting a timer based on the self-awakening information and controlling the direct current voltage reduction unit to be dormant when the whole vehicle key starting signal is not detected and the charging auxiliary power supply output signal is not detected, and the timer counts time based on the self-awakening time after the direct current voltage reduction unit is dormant;
the wake-up unit 73 is configured to determine whether the timer reaches a self-wake-up time after the dc voltage reduction unit is dormant, and if the timer reaches the self-wake-up time after the dc voltage reduction unit is dormant, the dc voltage reduction unit is self-wake-up and starts to output;
and a transmitting unit 74 for transmitting an enable signal to the BMS to turn on the BMS.
As an example, the receiving unit 71 is configured to receive self-wake-up information sent by the battery management system, where the self-wake-up information further includes a self-wake-up duration after the dc voltage reduction unit is dormant.
As an example, the receiving unit 71 is configured to receive self-wake-up information sent by the battery management system, where the self-wake-up information further includes a self-wake-up pattern sent by the battery management system and received by the dc voltage reducing unit;
the self-wake-up mode includes: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to time and duration periods after being dormant;
when the self-awakening mode is the single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to time and duration after being dormant.
The battery monitoring device provided by the embodiment of the invention is a direct current voltage reduction unit, and comprises a receiving unit 71, a control unit 72, a wake-up unit 73 and a sending unit 74, wherein the receiving unit 71 is configured to receive self-wake-up information sent by a BMS, when a vehicle key on signal is not detected and a charging auxiliary power output signal is not detected, the control unit 72 starts a timer based on the self-wake-up information to time and control the direct current voltage reduction unit to sleep, the wake-up unit 73 is configured to enable the direct current voltage reduction unit to self-wake up and start output when it is determined that the timer reaches a self-wake-up time after the direct current voltage reduction unit is in sleep, and send an enable signal to the BMS through the sending unit 74 to trigger the BMS to start. The BMS can monitor the battery under the mode of electricity down, has avoided lead-acid batteries to continue to export the power supply and has leaded to the feed problem to and when electric automobile stop work, can close low voltage power and lead to the BMS controller to be in off-working state, thereby can't monitor and feed back electric automobile power battery state.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a battery management device according to an embodiment of the present invention, including:
a memory 81 and a processor 82, the memory 81 having stored therein a computer program that, when executed by the processor 82, is capable of implementing the battery monitoring method applied to the BMS as in the above embodiments.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a dc voltage reduction device according to an embodiment of the present invention, which includes:
a memory 91 and a processor 92, wherein the memory 91 stores a computer program, and the computer program can realize the battery monitoring method applied to the dc voltage reduction unit in the above embodiment when the computer program is executed by the processor 92.
The battery management device or the dc voltage reduction device may include one or more processors and a memory, and the processors and the memory may be connected by a bus or other means. The memory, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor executes various functional applications and data processing of the device by executing the non-volatile software programs, instructions and modules stored in the memory, i.e., implements the battery monitoring method as described above.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store a list of options, etc. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and these remote memories may be connected to the external device via a network.
In another aspect of the embodiments of the present invention, there is provided a storage medium having a computer program stored therein, the computer program being capable of implementing the battery monitoring method applied to the BMS as in the above embodiments when executed by a processor.
Optionally, an embodiment of the present invention further provides a storage medium, where a computer program is stored in the storage medium, and when the computer program is executed by a processor, the battery monitoring method applied to the dc voltage reduction unit in the foregoing embodiments can be implemented.
The processes, functions, methods, and/or software described above may be recorded, stored, or fixed in one or more computer-readable storage media that include program instructions to be implemented by a computer to cause a processor to execute the program instructions. The media may also include program instructions, data files, data structures, etc., alone or in combination. The media or program instructions may be those specially designed and constructed for the purposes of the computer software industry, or they may be of the kind well known and available to those having skill in the computer software arts. Examples of computer readable media include: magnetic media such as hard disks, floppy disks, and magnetic tape; optical media, such as CDROM disks and DVDs; magneto-optical media, e.g., optical disks; and hardware devices specifically configured to store and execute program instructions, such as Read Only Memory (ROM), Random Access Memory (RAM), flash memory, and the like. Examples of program instructions include both machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter. The described hardware devices may be configured to act as one or more software modules to perform the operations and methods described above, and vice versa. In addition, computer readable storage media may be distributed over network coupled computer systems and may store and execute computer readable code or program instructions in a distributed fashion.
It should be understood that the values of the self-wake-up time, the time duration, the period, the voltage threshold, the minimum cell voltage, and the like exemplarily shown in the embodiment of the present invention do not limit the scheme provided by the embodiment of the present invention.
Although the embodiments of the present invention are disclosed as above, the descriptions are only for the convenience of understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be apparent to persons skilled in the art that various changes and modifications can be made in the form and details of the embodiments of the invention, and it is intended that the invention be limited only by the scope of the appended claims.
Claims (17)
1. A battery monitoring method, comprising:
based on an enabling signal, a Battery Management System (BMS) is started, wherein the enabling signal is sent to the BMS by a direct current voltage reduction unit based on self-awakening information, and the self-awakening information is sent to the direct current voltage reduction unit by the BMS before power-off;
the BMS detects state parameters of a battery, the state parameters including: a voltage of a cell in the battery and a load State (SOC) of the battery;
when the conditions are met, the BMS sends the self-awakening information to the direct current voltage reduction unit, the BMS is powered off, and the self-awakening information comprises the self-awakening time after the direct current voltage reduction unit is dormant;
wherein the conditions include: the SOC of the battery is greater than a lowest SOC threshold value of the battery and a minimum cell voltage is greater than a cell voltage threshold value.
2. The method of claim 1, wherein the BMS sends the self-wake-up message to the DC voltage reduction unit, comprising:
and when the key-on signal of the whole vehicle is not detected and the output signal of the charging auxiliary power supply is not detected, the BMS sends the self-awakening information to the direct current voltage reduction unit.
3. The method according to claim 1 or 2, wherein the self-wake-up information further comprises: the self-awakening duration of the DC voltage reduction unit after dormancy.
4. The method of claim 3, wherein the self-wake-up information further comprises: a self-wake-up mode;
the self-wake-up mode comprises: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to the time and the duration period after being dormant;
and when the self-awakening mode is a single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to the time and the duration after being dormant.
5. The method of claim 1, wherein the BMS detects a state parameter of a battery further comprises detecting a temperature of the battery;
the conditions further include:
the temperature of the battery is less than the maximum temperature threshold of the cell.
6. The method of claim 5, further comprising:
and when the temperature of the battery is greater than or equal to the highest temperature threshold of the battery core, the BMS sends out abnormal battery temperature alarm information and prohibits the direct current voltage reduction unit from sleeping.
7. The method of claim 1, further comprising:
and when the SOC of the battery is less than or equal to the lowest SOC threshold value of the battery or the minimum cell voltage is less than or equal to the cell voltage threshold value, sending out battery under-voltage alarm information and forbidding the direct current voltage reduction unit to sleep.
8. The method of claim 1, wherein the BMS sending the self-wake-up message to the DC voltage reduction unit comprises:
the BMS sets the self-awakening information based on the state parameters;
and the BMS sends the self-awakening information to the direct current voltage reduction unit.
9. A Battery Management System (BMS), comprising:
the system comprises an enabling unit, a direct current voltage reducing unit and a transmitting and receiving unit, wherein the enabling unit is used for enabling the BMS to be started based on an enabling signal, the enabling signal is sent to the BMS by the direct current voltage reducing unit based on self-awakening information, and the self-awakening information is sent to the direct current voltage reducing unit by the BMS through the transmitting and receiving unit before power is cut off;
a detection unit for detecting a state parameter of the battery, the state parameter including: a voltage of a cell in the battery and a load State (SOC) of the battery;
the processing unit is used for sending the self-awakening information to the direct current voltage reduction unit through the transceiving unit and powering down the BMS when the following conditions are met, wherein the self-awakening information comprises the self-awakening time after the direct current voltage reduction unit is dormant;
wherein the conditions include: the SOC of the battery is greater than a lowest SOC threshold value of the battery and a minimum cell voltage is greater than a cell voltage threshold value.
10. The BMS of claim 9,
the detection unit is also used for detecting a key opening signal of the whole vehicle and/or an output signal of the charging auxiliary power supply;
the processing unit is configured to: and when the detection unit does not detect a key opening signal of the whole vehicle and also does not detect an output signal of the charging auxiliary power supply, the self-awakening information is sent to the direct current voltage reduction unit through the transceiving unit.
11. The BMS according to claim 9 or 10,
the processing unit is used for sending the self-awakening information to the direct current voltage reduction unit through the transceiving unit; the self-wakeup information further includes: the self-awakening duration of the DC voltage reduction unit after dormancy.
12. The BMS of claim 11,
the processing unit is used for sending the self-awakening information to the direct current voltage reduction unit through the transceiving unit; the self-wakeup information further includes: a self-wake-up mode;
the self-wake-up mode comprises: a periodic mode and a single-shot mode;
when the self-awakening mode is a periodic mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is self-awakened according to the time and the duration period after being dormant;
and when the self-awakening mode is a single mode, the self-awakening information is used for indicating that the direct current voltage reduction unit is awakened once according to the time and the duration after being dormant.
13. The BMS according to claim 9, wherein the detection unit is further configured to detect a temperature of the battery;
the processing unit is configured to: when the condition is met, sending the self-awakening information to the direct current voltage reduction unit, wherein the condition further comprises: the temperature of the battery is less than the maximum temperature threshold of the cell.
14. The BMS of claim 13, wherein the processing unit is further configured to:
and when the temperature of the battery is greater than or equal to the highest temperature threshold of the battery core, sending out abnormal battery temperature alarm information and forbidding the direct current voltage reduction unit from sleeping.
15. The BMS of claim 9, wherein the processing unit is further configured to:
and when the SOC of the battery is less than or equal to the lowest SOC threshold value of the battery or the minimum cell voltage is less than or equal to the cell voltage threshold value, sending out battery under-voltage alarm information and forbidding the direct current voltage reduction unit to sleep.
16. The BMS of claim 9, wherein the processing unit is further configured to: setting the self-awakening information based on the state parameter.
17. A battery management apparatus, comprising: a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, is capable of implementing a battery monitoring method as claimed in any one of claims 1 to 8.
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| CN202011340713.4A CN112531824A (en) | 2020-06-22 | 2020-06-22 | Battery monitoring method, battery monitoring device and direct-current voltage reduction equipment |
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