CN108656976A - Battery management system - Google Patents
Battery management system Download PDFInfo
- Publication number
- CN108656976A CN108656976A CN201710212128.8A CN201710212128A CN108656976A CN 108656976 A CN108656976 A CN 108656976A CN 201710212128 A CN201710212128 A CN 201710212128A CN 108656976 A CN108656976 A CN 108656976A
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- bms
- low
- circuit
- switching circuit
- power
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of battery management system, including：Processor, power circuit and switching circuit；Processor is connect with power circuit and switching circuit respectively, and switching circuit is connected between power circuit and low-tension supply；Switching circuit is used for when detecting wake-up signal, the connection between turn-on power circuit and low-tension supply, is waken up BMS and is entered normal operating conditions；Processor is used to, when detecting that wake-up signal disappears, control the connection between switching circuit interrupting power circuit and low-tension supply, BMS is made to enter dormant state.BMS provided by the invention; switching circuit can be input to its signal with automatic identification; connection between on or off power circuit and low-tension supply; realize to BMS wake up with suspend mode automatically control and the normalizing of BMS power, the influence that non-normalizing power supply mode can be avoided to generate BMS while reducing system power dissipation.
Description
Technical field
The present invention relates to battery management technique more particularly to a kind of battery management systems, belong to electric vehicle engineering field.
Background technology
Quantity with new-energy automobile in China's automobile industry increases rapidly, attention rate of the consumer to electric vehicle
It is higher and higher.Battery is particularly important as the core component in electric vehicle, security performance.It is all made of currently on the market
Battery management system (Battery Management System, BMS) is monitored in real time and is managed to the state of battery.
On electric vehicle, BMS is generally powered by the low-tension supply on vehicle.When the various functions of BMS fully open,
Power consumption is larger, if vehicle does not use for a long time, and BMS is constantly in working condition, then is easy to run out of the electricity of low-tension supply,
Cause electric vehicle that can not normally start when using next time.Therefore, electric vehicle when not in use, is needing to enter for a long time
Dormant state, to reduce system power dissipation.
At present on electric vehicle, BMS generally uses non-normalizing connection type, BMS to pass through vehicle with low-tension supply when connecting
Interior switch accesses low-tension supply, i.e., the power supply of BMS is controlled by the key switch of vehicle.When car key starts, BMS is powered on
Work, BMS enter normal operating conditions；After vehicle stall, BMS power down, BMS enters dormant state.When the power battery of vehicle
When needing charging, is powered for BMS by the charging gun on charging pile, wake up BMS and enter normal operating conditions.
But above-mentioned this non-normalizing connection type often will appear BMS and charging gun when charging using charging gun
The inconsistent phenomenon of supply voltage, to influence the normal use of BMS.
Invention content
In view of this, the present invention provides a kind of battery management system, the working condition of BMS can be automatically controlled, and use
Normalizing power supply mode can avoid the influence that non-normalizing power supply mode generates BMS while reducing system power dissipation.
To achieve the above object, the present invention provides a kind of battery management system BMS, including：It processor, power circuit and opens
Powered-down road；Processor is connect with power circuit and switching circuit respectively, switching circuit be connected to power circuit and low-tension supply it
Between；
Switching circuit is used for when detecting wake-up signal, the connection between turn-on power circuit and low-tension supply, is waken up
BMS enters normal operating conditions；
Processor is used for when detecting that wake-up signal disappears, control switching circuit interrupting power circuit and low-tension supply it
Between connection, so that BMS is entered dormant state.
In one embodiment of this invention, wake-up signal includes：Controller local area network's CAN signal and/or hard signal.
In one embodiment of this invention, switching circuit is additionally operable to：In the case where vehicle is in flameout state, low tension is detected
When the voltage value in source is less than the first predeterminated voltage, the connection between turn-on power circuit and low-tension supply, so that processor controls
Power battery charges to low voltage.
In one embodiment of this invention, processor is additionally operable to：It is pre- to be equal to second in the voltage value for detecting low-tension supply
If when voltage, controlling the connection between switching circuit interrupting power circuit and low-tension supply.
In one embodiment of this invention, BMS further includes：Timing circuit；Timing circuit respectively with switching circuit and low pressure
Power supply connects, and timing circuit is used for when vehicle is in flameout state, is sent to switching circuit according to the timing of the first preset time
Continuity signal, so that switching circuit is according to the connection between Continuity signal turn-on power circuit and low-tension supply.
In one embodiment of this invention, timing circuit is additionally operable to after sending Continuity signal, according to the second preset time
Timing sends cut-off signals to switching circuit, so that switching circuit is according between cut-off signals interrupting power circuit and low-tension supply
Connection.
In one embodiment of this invention, timing circuit is integrated on a processor.
BMS provided in an embodiment of the present invention, switching circuit can be input to its signal, on or off electricity with automatic identification
Connection between source circuit and low-tension supply, realize to BMS wake up with suspend mode automatically control and the normalizing of BMS power,
The influence that non-normalizing power supply mode generates BMS can be avoided while reducing system power dissipation.
Description of the drawings
Fig. 1 is the structural schematic diagram of BMS embodiments one provided by the invention；
Fig. 2 is that BMS signals provided by the invention flow to schematic diagram；
Fig. 3 provides the structural schematic diagram of your BMS embodiments two for the present invention.
Reference sign：
10- processors；
20- power circuits；
30- switching circuits；
40- low-tension supplies；
50- cars switch；
60- entire car controllers；
70- timing circuits.
Specific implementation mode
Non- normalizing connection type is generally used when connecting with low-tension supply for existing BMS, is filled using charging gun
When electric, due to BMS and charging gun supply voltage it is inconsistent and the technical issues of influence the normal use of BMS, the embodiment of the present invention
A kind of BMS is provided, mainly adds switching circuit in existing BMS, its letter is input to by switching circuit automatic identification
Number carry out the connection between on or off power circuit and low-tension supply, is automatically controlled with suspend mode to realize to wake up BMS
And the normalizing power supply of BMS, it can avoid the influence that non-normalizing power supply mode generates BMS while reducing system power dissipation.
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described.
Fig. 1 is the structural schematic diagram of BMS embodiments one provided by the invention, as shown in Figure 1, BMS provided in this embodiment
Including：Processor 10, power circuit 20 and switching circuit 30；Processor 10 connects with power circuit 20 and switching circuit 30 respectively
It connects, switching circuit 30 is connected between power circuit 20 and low-tension supply 40；Switching circuit 30 is for detecting wake-up signal
When, the connection between turn-on power circuit 20 and low-tension supply 40 wakes up BMS and enters normal operating conditions；Processor 10 is used for
When detecting that wake-up signal disappears, the connection between 30 interrupting power circuit 20 of switching circuit and low-tension supply 40 is controlled, is made
BMS enters dormant state.
Specifically, processor 10 can be micro-control unit (Microcontroller Unit；MCU), power circuit 20
It powers to the various circuits in BMS under the electric power effect provided for low-tension supply 40 onboard.When power circuit 20 with it is low
When being connected between voltage source 40, entire BMS enters normal operating conditions, and processor 10 can control the reality of the various circuits in BMS
Now to the monitoring of power battery and management.
Switching circuit 30 is connected between power circuit 20 and low-tension supply 40, can be with controlling power circuit 20 and low pressure
Break-make between power supply 40.When BMS enters dormant state, low-tension supply 40 is that switching circuit 30 provides power supply, switching circuit 30
It can be connect with interior interior switch, entire car controller, charging interface etc., to detect wake-up signal.Switching circuit 30 detects
To wake-up signal, by the connection between turn-on power circuit 20 and low-tension supply 40, when waking up BMS, BMS enters normal work
State, processor 10 start to work normally；When processor 10 detects that wake-up signal disappears, can be sent to switching circuit 30
The connection between 30 interrupting power circuit 20 of signal control switch circuit and low-tension supply 40 is controlled, BMS is made to enter dormant state.
Wherein, wake-up signal can specifically include：Controller local area network's (Controller Area Network, CAN) signal and/
Or hard signal etc..
Fig. 2 is that BMS signals provided by the invention flow to schematic diagram, and interior interior switch is connected with switching circuit 30 in figure
50, entire car controller 60, wake-up signal include illustrating for CAN signal and hard signal.
The operation principle of BMS as shown in Figure 2 is specially：Vehicle is under flameout state, when starting the vehicle, whole on vehicle
Vehicle controller 60 and interior switch 50 are started to work, and generate CAN signal and hard signal respectively；Switching circuit 30 detects CAN
When signal or hard signal (wake-up signal), the connection between turn-on power circuit 20 and low-tension supply 40,20 work of power circuit
Make, and then entire BMS enters normal operating conditions.After vehicle stall, entire car controller 60 and interior switch 50 on vehicle stop
It only works, CAN signal and hard signal disappear；When processor 10 detects that CAN signal or hard signal disappear, to switching circuit
30 send control signal, control the connection between 30 interrupting power circuit 20 of switching circuit and low-tension supply 40, power circuit 20
It is stopped, entire BMS enters dormant state, and switching circuit 30 continues to have detected whether wake-up signal at this time.
It is to be illustrated so that hard signal is the interior generation of switch 50 as an example in above-mentioned Fig. 2, hard signal
Can be vehicle external input to BMS, such as vehicle, when charging pile charges, charging gun also will produce hard signal.In addition, calling out
Awake signal can also be the signal that other are used to wake up BMS, and the present embodiment is not particularly limited.
In the present embodiment, switching circuit can be input to its signal with automatic identification, on or off power circuit with it is low
Connection between voltage source is realized and is automatically controlled with suspend mode to BMS wake-ups, so as to not used for a long time in vehicle, controlled
BMS processed enters dormant state, to reduce system power dissipation.Also, BMS realizes oneself of BMS power supplies by switching circuit inside it
Dynamic control, it is direct-connected between BMS and low-tension supply (using normalizing power supply mode), when the power battery using charging gun to vehicle
When being charged, BMS can automatically wake up BMS according to the hard signal (wake-up signal) of charging gun and enter normal operating conditions,
BMS is powered by low-tension supply always, because BMS and the inconsistent phenomenon of charging gun supply voltage may be not present, so as to avoid
BMS is had an impact.
BMS provided in this embodiment, switching circuit can be input to its signal, on or off power supply electricity with automatic identification
Connection between road and low-tension supply, realize to BMS wake up with suspend mode automatically control and the normalizing of BMS power, reducing
The influence that non-normalizing power supply mode can be avoided to generate BMS while system power dissipation.
Fig. 3 provides the structural schematic diagram of your BMS embodiments two for the present invention, and the present embodiment is to real described in above-mentioned Fig. 1
That applies example advanced optimizes supplement.As shown in figure 3, on the basis of above-mentioned embodiment illustrated in fig. 1, BMS provided in this embodiment
Further include：Timing circuit 70；Timing circuit 70 is connect with switching circuit 30 and low-tension supply 40 respectively, and timing circuit 70 is used for
When vehicle is in flameout state, Continuity signal is sent to switching circuit 30 according to the timing of the first preset time, so that switching circuit
30 according to the connection between Continuity signal turn-on power circuit 20 and low-tension supply 40.Timing circuit 70 is additionally operable to sending conducting
After signal, cut-off signals are sent to switching circuit 30 according to the timing of the second preset time, so that switching circuit 30 is believed according to shutdown
Connection number between interrupting power circuit 20 and low-tension supply 40.
Specifically, vehicle long-time is when not in use, BMS is in power-down state (i.e. dormant state) always, and this period is such as
When fruit power battery has unusual condition to occur, BMS cannot be detected timely, to there is certain risk.The present embodiment
In, increase timing circuit 70 in BMS, when vehicle is in flameout state for a long time, timing circuit 70 can be according to setting
The timing of first preset time sends Continuity signal to switching circuit 30, makes switching circuit 30 according to Continuity signal turn-on power circuit
Connection between 20 and low-tension supply 40 is monitored the state of power battery to wake up BMS, solves BMS and falls for a long time
Risk problem caused by electricity.
When timing circuit 70 has sent Continuity signal, after BMS monitors a period of time (the second preset time) to power battery,
Timing circuit 70 can send cut-off signals to switching circuit 30 again, make switching circuit 30 according to cut-off signals interrupting power circuit
Connection between 20 and low-tension supply 40 makes BMS enter dormant state to save energy.
It should be noted that above-mentioned Continuity signal and cut-off signals can repeat to send, i.e., vehicle is opposite at one
In the long time when not used, timing circuit 70 just can send conducting letter every the first preset time to switching circuit 30
Number, and after sending Continuity signal every time cut-off signals are sent to switching circuit 30 again by the second preset time.Wherein, first
Preset time and the second preset time can be specifically arranged as required to, and the present embodiment is not particularly limited.With switching circuit 30
Equally, timing circuit 70 can be powered by low-tension supply 40, consume de minimis energy.
In addition, the timing circuit 70 can integrate on processor 10, i.e., from processor 10 to timing to switching circuit 30
Send above-mentioned Continuity signal and cut-off signals.If when it is implemented, existing processor have clocking capability, can directly by
Timing function adds on a processor；Otherwise in addition timing circuit 70 independently of processor in BMS can be set, specifically may be used
To be arranged as required to.
As an alternative embodiment, in the present embodiment, switching circuit 30 is additionally operable to：It is in flameout state in vehicle
Under, when detecting that the voltage value of low-tension supply 40 is less than the first predeterminated voltage, between turn-on power circuit 20 and low-tension supply 40
Connection so that processor 10 control power battery to low voltage charge.Processor 10 is additionally operable to：Detecting low-tension supply
When 40 voltage value is equal to the second predeterminated voltage, the company between 30 interrupting power circuit 20 of switching circuit and low-tension supply 40 is controlled
It connects.
Specifically, vehicle long-time is when not in use, BMS is in power-down state always, and BMS not can confirm that low-tension supply 40
State, when the low-tension supply 40 that this period powers if it is BMS is under-voltage, BMS can not in time fill low-tension supply 40
Electricity, consequently, it is possible to influencing the startup of vehicle.In the present embodiment, when vehicle is in flameout state, switching circuit 30 can detect
For its power supply low-tension supply 40 voltage value size, when less than the first predeterminated voltage (such as normal working voltage be 12V,
First predeterminated voltage can be 10V) when, the connection between turn-on power circuit 20 and low-tension supply 40, the power circuit 20 of BMS
Work, entire BMS enter normal operating conditions, and processor 10 can detect that the voltage value of low-tension supply 40 is relatively low in real time, this
When can control power battery to low-tension supply 40 charge, in time for low-tension supply 40 supplement electric power, avoid influence vehicle startup.
When processor 10 detects that the voltage value of low-tension supply 40 is equal to the second predeterminated voltage (such as 13V), Ke Yixiang
Switching circuit 30 sends control signal, controls the connection between 30 interrupting power circuit 20 of switching circuit and low-tension supply 40, makes
BMS enters dormant state to save energy.
BMS provided in this embodiment, by timing circuit and switching circuit, can vehicle for a long time when not in use, and
When detect the abnormality of battery and the under-voltage condition of low-tension supply, avoid influencing caused by BMS long-times system power failure.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer read/write memory medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or
The various media that can store program code such as person's CD.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of battery management system BMS, which is characterized in that including：Processor, power circuit and switching circuit；The processing
Device is connect with the power circuit and the switching circuit respectively, and the switching circuit is connected to the power circuit and low tension
Between source；
The switching circuit is used for when detecting wake-up signal, and the company between the power circuit and the low-tension supply is connected
It connects, wakes up the BMS and enter normal operating conditions；
The processor is used for when detecting that the wake-up signal disappears, and is controlled the switching circuit and is disconnected the power circuit
With the connection between the low-tension supply, the BMS is made to enter dormant state.
2. BMS according to claim 1, which is characterized in that the wake-up signal includes：Controller local area network CAN believes
Number and/or hard signal.
3. BMS according to claim 1, which is characterized in that the switching circuit is additionally operable to：It is in flameout state in vehicle
Under, when detecting that the voltage value of the low-tension supply is less than the first predeterminated voltage, the power circuit and the low tension is connected
Connection between source, so that processor control power battery charges to the low voltage.
4. BMS according to claim 3, which is characterized in that the processor is additionally operable to：Detecting the low-tension supply
Voltage value when being equal to the second predeterminated voltage, control the switching circuit and disconnect between the power circuit and the low-tension supply
Connection.
5. BMS according to claim 1, which is characterized in that the BMS further includes：Timing circuit；The timing circuit point
It not being connect with the switching circuit and the low-tension supply, the timing circuit is used for when vehicle is in flameout state, according to
The timing of first preset time sends Continuity signal to the switching circuit, so that the switching circuit is led according to the Continuity signal
Logical connection between the power circuit and the low-tension supply.
6. BMS according to claim 5, which is characterized in that the timing circuit is additionally operable to sending the Continuity signal
Afterwards, cut-off signals are sent to the switching circuit according to the timing of the second preset time, so that the switching circuit is according to the pass
Break signal disconnects the connection between the power circuit and the low-tension supply.
7. BMS according to claim 5 or 6, which is characterized in that the timing circuit is integrated on the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212128.8A CN108656976B (en) | 2017-04-01 | 2017-04-01 | Battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212128.8A CN108656976B (en) | 2017-04-01 | 2017-04-01 | Battery management system |
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| CN108656976A true CN108656976A (en) | 2018-10-16 |
| CN108656976B CN108656976B (en) | 2021-04-13 |
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| CN201710212128.8A Active CN108656976B (en) | 2017-04-01 | 2017-04-01 | Battery management system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111527004A (en) * | 2018-11-27 | 2020-08-11 | 株式会社Lg化学 | Method for starting battery driving system and recognizing external system off state using the same |
| WO2021008354A1 (en) * | 2019-07-16 | 2021-01-21 | 宁德时代新能源科技股份有限公司 | Power supply ensuring system and power supply ensuring method |
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| CN108656976B (en) | 2021-04-13 |
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