CN106100059A - The control method of pre-charge circuit, battery management system and vehicle - Google Patents
The control method of pre-charge circuit, battery management system and vehicle Download PDFInfo
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- CN106100059A CN106100059A CN201610615725.0A CN201610615725A CN106100059A CN 106100059 A CN106100059 A CN 106100059A CN 201610615725 A CN201610615725 A CN 201610615725A CN 106100059 A CN106100059 A CN 106100059A
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- charge circuit
- status information
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- charging duration
- charge
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 claims description 8
- 230000003862 health status Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- H02J7/0077—
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Abstract
The application provides the control method of a kind of pre-charge circuit, battery management system and vehicle.The control method of described pre-charge circuit, including: the status information of the battery in monitoring pre-charge circuit；According to the described status information monitored, determine the charging duration of described pre-charge circuit；According to the described charging duration determined, the capacitor in described pre-charge circuit is charged.The present invention can be according to the state of the battery in pre-charge circuit, the charging duration of pre-charge circuit is adaptively adjusted, solve the problem that changeless charging duration of the prior art is brought so that the duration virtual condition all the time with pre-charge circuit of charging of pre-charge circuit adapts.
Description
Technical field
The application relates to cell art, particularly to control method, the battery management system of a kind of pre-charge circuit
And vehicle.
Background technology
At present, pre-charge circuit is applied in all multiple battery systems, with the components and parts in protection circuit, such as: electronic
The battery system of automobile.
As it is shown in figure 1, be the circuit diagram of a kind of pre-charge circuit of the prior art.This circuit specifically include that battery 10,
Capacitor 20, positive switch 31, preset resistance 40, negative switch 33 and precharge switch 32, wherein, above-mentioned positive switch 31,
Preset resistance 40, precharge switch 32 are connected between the positive pole of battery 10 and above-mentioned capacitor 20, and above-mentioned negative switch 33 is even
It is connected between the negative pole of battery 10 and above-mentioned capacitor 20.When above-mentioned precharge switch 32 and above-mentioned negative switch 33 are closed,
And above-mentioned positive switch 31 is when being disconnected, above-mentioned capacitor 20 is in the state of being electrically charged, hereafter the voltage at these capacitor 20 two ends
Begin to ramp up.After charging a period of time, above-mentioned positive switch 31 can be closed, to terminate the charging to above-mentioned capacitor 20
Process, the dash current (inrush current) in the moment that above-mentioned positive switch 31 is closed, in this pre-charge circuitWherein, UBIt is the voltage at battery two ends, UCIt is the voltage at capacitor two ends, RBIt it is the internal resistance of battery.Generally, for
Guarantee to be closed the dash current I of moment in above-mentioned positive switch 31 sufficiently small, the voltage U at above-mentioned capacitor two endsCOn needs
It is raised to a sufficiently large numerical value, so that the difference (U of the voltage at the voltage at battery two ends and capacitor two endsB-UC) enough
Little.
In prior art, generally the charging duration of above-mentioned pre-charge circuit is set as fixed value TSpecified, but, along with electricity
The operation of cell system, it is possible that following problem: the charging duration T that above-mentioned pre-charge circuit is actually neededActualAnd it is not equal to pre-
The T first setSpecified, thus T set in advance cannot be guaranteedSpecifiedAll the time with the virtual condition fit of pre-charge circuit.
Summary of the invention
In view of this, the application provides the control method of a kind of pre-charge circuit, battery management system and vehicle, with all
Or partly solve problem above present in prior art.
Specifically, the application is achieved by the following technical solution:
According to an aspect of the present invention, it is provided that the control method of a kind of pre-charge circuit, including:
The status information of the battery in monitoring pre-charge circuit；
According to the described status information monitored, determine the charging duration of described pre-charge circuit；
According to the described charging duration determined, the capacitor in described pre-charge circuit is charged.
According to another aspect of the present invention, it is provided that a kind of battery management system, including:
Monitoring means, for monitoring the status information of the battery in pre-charge circuit；
Determine unit, for according to the described status information monitored, determining the charging duration of described pre-charge circuit.
Control unit, for filling the capacitor in described pre-charge circuit according to the described charging duration determined
Electricity.
A kind of vehicle that the present invention provides, including above-mentioned battery management system.
The technical scheme provided from the above embodiment of the present invention, the present invention is by the battery in monitoring pre-charge circuit
Status information, and according to the described status information that monitors, determine the described pre-charge circuit corresponding with this status information
Charging duration, the capacitor in described pre-charge circuit is charged by the described charging duration that final foundation determines.Can see
Going out, the charging duration of pre-charge circuit adaptively can be adjusted by the present invention according to the state of the battery in pre-charge circuit
Whole, solve the problem that changeless charging duration of the prior art is brought so that the charging duration of pre-charge circuit
All the time the virtual condition with pre-charge circuit adapts.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of pre-charge circuit of the prior art；
The flow chart of the control method of the pre-charge circuit that Fig. 2 provides for one embodiment of the invention；
The block diagram of the battery management system that Fig. 3 provides for one embodiment of the invention.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Explained below relates to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they are only with the most appended
The example of the apparatus and method that some aspects that described in detail in claims, the application are consistent.
It is only merely for describing the purpose of specific embodiment at term used in this application, and is not intended to be limiting the application.
" a kind of ", " described " and " being somebody's turn to do " of singulative used in the application and appended claims is also intended to include majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wraps
Any or all containing one or more projects of listing being associated may combination.
Although should be appreciated that in the application possible employing term first, second, third, etc. to describe various information, but this
A little information should not necessarily be limited by these terms.These terms are only used for same type of information is distinguished from each other out.Such as, without departing from
In the case of the application scope, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depend on linguistic context, word as used in this " if " can be construed to " ... time " or " when ...
Time " or " in response to determining ".
The flow process of the control method of the pre-charge circuit that Fig. 2 provides for one embodiment of the invention, comprises the steps:
S101: the status information of the battery in monitoring pre-charge circuit.
In the embodiment of the present invention, the status information of battery can include but not limited to: state-of-charge (the State of of battery
Charge, SOC), the health status (Section Of Health, SOH) of battery, and one or more in battery temperature.
Wherein, described state-of-charge SOC can be that the residual capacity after battery uses a period of time or lies idle for a long time is complete with it
The ratio of the capacity of charged state, described health status SOH can be that battery completely fills the capacity ratio relative to rated capacity.
S102: according to the described status information monitored, determine the charging duration of described pre-charge circuit.
The most as shown in Figure 1 above, the dash current in pre-charge circuit (inrush current)Wherein,
UBIt is the voltage at battery two ends, UCIt is the voltage at capacitor two ends, RBIt it is the internal resistance of battery.Usually, for the unit in protection circuit
Device, can preset dash current threshold value I according to practical situation for above-mentioned pre-charge circuitmax(or claim maximum to permit
Permitted dash current) so that the moment being closed in above-mentioned positive switch 31, the dash current in this pre-charge circuit
(inrush current) is without departing from dash current threshold value I set in advancemax(such as: 50 peaces).
For pre-charge circuit, in the case of the internal resistance of cell is specified, then can be according to above-mentioned formula:It is calculated in the battery two ends of the moment that above-mentioned positive switch 31 is closed and the voltage difference at capacitor two ends:
UB-UC, such that it is able to according to the current voltage U at battery two endsB, determine the voltage U of capacitorCAt least should rise to how many, enter
And may determine that how long pre-charge circuit should charge for capacitor.
But, generally, the internal resistance value of battery is not fixing, and the internal resistance value of battery can be along with many factors
Change, such as operating temperature, state-of-charge SOC and health status SOH etc. of battery.In the embodiment of the present application, the internal resistance of battery
Value can be calculated by default internal resistance computing formula, and the independent variable of this internal resistance computing formula may include that battery
Operating temperature, state-of-charge SOC and health status SOH etc..So, for given battery two ends and capacitor two ends
Voltage difference, when the internal resistance value of battery becomes big (such as: used batteries or cold battery), rushing of the moment that above-mentioned positive switch 31 is closed
Hitting electric current can be lower；Otherwise, when the internal resistance value of battery diminishes, the dash current meeting of the moment that above-mentioned positive switch 31 is closed
Higher.Visible, for the different feature of battery internal resistance value under different conditions, above-mentioned pre-charge circuit is required to capacitor
The duration being charged can also correspondingly adjust, if still continuing to use changeless charging duration, then be likely to result in as
Lower problem: when the internal resistance value of battery becomes big, default fixing charging duration is more than the charging duration being actually needed, thus causes
Battery system needs to wait unwanted duration, could enter normal operating conditions；On the other hand, if the internal resistance value of battery becomes
Little, then the fixing charging duration preset is likely less than the charging duration being actually needed, thus when causing the charging of pre-charge circuit
Long the voltage difference at battery two ends and capacitor two ends is excessive not, does not reaches the basic demand of protection components and parts.
Visible, the charging duration of pre-charge circuit need to be moved by the present invention for the variation characteristic of the internal resistance value of battery
State adjusts.
As one specific embodiment of the present invention, in above-mentioned steps S102, can according to predetermined status information with
The corresponding relation of charging duration, when searching the charging of the described pre-charge circuit corresponding with the described status information monitored
Long.As described previously for the different conditions information of battery, the pre-charge circuit corresponding with status information all can be calculated
Charging duration, thus form the corresponding relation of the charging duration of the status information of battery and pre-charge circuit, above-mentioned corresponding close
System can present in the form of a table, and be written to battery management system (Battery Management System,
BMS) in.As: if the status information of the battery monitored includes: state-of-charge is 0.8, the health status of battery is 96%, electricity
The temperature in pond is: 35 DEG C, then can pass through above-mentioned predetermined corresponding relation, find and the currently monitored status information arrived
Corresponding charging duration is: 2 seconds.
In one embodiment of the invention, the corresponding relation of the status information of battery and charging duration can come as follows
Determine:
A) internal resistance value of the described battery corresponding with status information is calculated.As set forth above, it is possible to according to predetermined electricity
The internal resistance value computing formula in pond calculates.
B) according to calculated described internal resistance value and default dash current threshold value Imax, calculate battery two ends and above-mentioned
The maximum voltage difference at the capacitor two ends in pre-charge circuit: UB-UC。
C) according to described maximum voltage difference: UB-UCAnd the state-of-charge SOC of described battery, determine described pre-charge circuit
Charging duration.
Wherein, the voltage at battery two ends is relevant to the state-of-charge SOC of battery.It is to say, the value of SOC is the biggest, then electricity
The voltage at two ends, pond is the highest, otherwise, the voltage at battery two ends is the lowest.For battery management system BMS, can basis
Above-mentioned maximum voltage difference: UB-UCAnd the voltage at battery two ends: UB, it is calculated the voltage that capacitor two ends should rise to: UC。
Finally, it may be determined that the battery of current state-of-charge SOC needs great charging duration, could be made above-mentioned by charging process
The voltage at capacitor two ends rises to required value.
D) the above-mentioned charging duration determined is carried out corresponding with described status information.
As another embodiment of the present invention, above-mentioned steps S102 can specifically include:
According to the described status information monitored, calculate the internal resistance value of the described battery corresponding with described status information；Root
The charging duration of described pre-charge circuit is determined according to the internal resistance value of described battery.Specifically, according to the internal resistance value of battery with give
Fixed dash current threshold value Imax, the maximum voltage at capacitor two ends in battery two ends and above-mentioned pre-charge circuit can be calculated
Difference: UB-UC.And then, can be according to described maximum voltage difference: UB-UCAnd the state-of-charge SOC of described battery, determine described preliminary filling
The charging duration of electricity circuit.
Visible, battery management system can be according to the status information of the battery monitored, by searching predetermined shape
State information and the corresponding relation of charging duration, search and obtain the charging duration corresponding with the currently monitored status information arrived.Press down
Or, battery management system can also be according to the status information of the battery monitored, by corresponding computing formula, be calculated with
The charging duration that the currently monitored status information arrived is corresponding.It should be noted that determine above-mentioned status information and the duration that charges
The detailed process of corresponding relation is not limited to above-described embodiment, such as: can rule of thumb be manually set and different conditions information
Corresponding charging duration.
S103: the capacitor in described pre-charge circuit is charged according to the described charging duration determined.
Battery management system BMS according to the charging duration determined, can control respectively the positive switch in pre-charge circuit,
When negative switch and precharge switch are closing and when are disconnecting, thus realize the control to charging process.
The control method of the pre-charge circuit that the present invention provides, is believed by the state of the battery in monitoring pre-charge circuit
Breath, and according to the described status information monitored, determine the charging duration of the described pre-charge circuit corresponding with this status information,
Capacitor in described pre-charge circuit is charged by the described charging duration that final foundation determines.It can be seen that the present invention
The charging duration of pre-charge circuit can adaptively be adjusted according to the state of the battery in pre-charge circuit, solves
The problem that changeless charging duration of the prior art is brought so that the charging duration of pre-charge circuit all the time with preliminary filling
The virtual condition of electricity circuit adapts.The present invention can be on the premise of the components and parts in being protected against circuit so that pre-
The charging duration of charging circuit is the shortest, thus shortens the waiting time before battery system enters normal work as far as possible,
Promote the experience of user.
The block diagram of the battery management system that Fig. 3 provides for one embodiment of the invention, due to the control with above-mentioned pre-charge circuit
Method processed is corresponding, and the embodiment of the control method being referred to above-mentioned pre-charge circuit understands or explains this battery management system
The content of system.In the present embodiment, this battery management system 100 includes:
Monitoring means 101, for monitoring the status information of the battery in pre-charge circuit；Wherein, described status information bag
Include but be not limited to: one or more in state-of-charge SOC, health status SOH, temperature.
Determining unit 102, the described status information monitored for basis, when determining the charging of described pre-charge circuit
Long.
Control unit 103, for carrying out the capacitor in described pre-charge circuit according to the described charging duration determined
Charging.Specifically, this control unit 103 is established by cable in order to control positive switch, negative switch and preliminary filling in pre-charge circuit
The closed and disconnected closed, thus realize the control of the charging process to above-mentioned pre-charge circuit.
The battery management system that the present invention provides, by the status information of the battery in monitoring pre-charge circuit, and foundation
The described status information monitored, determines the charging duration of the described pre-charge circuit corresponding with this status information, final foundation
Capacitor in described pre-charge circuit is charged by the described charging duration determined.It can be seen that the present invention can basis
The state of the battery in pre-charge circuit, adaptively adjusts the charging duration of pre-charge circuit, solves prior art
In the problem brought of changeless charging duration so that the charging duration of pre-charge circuit all the time with pre-charge circuit
Virtual condition adapts.The present invention can be on the premise of the components and parts in being protected against circuit so that pre-charge circuit
Charging duration the shortest, thus shorten the waiting time before battery system enters normal work as far as possible, promote user
Experience.
In the present invention one specific embodiment, described determine that unit 102 can be specifically for:
According to the corresponding relation of predetermined status information with charging duration, the described status information searched and monitor
The charging duration of corresponding described pre-charge circuit；Or,
According to the described status information monitored, calculate the internal resistance value of the described battery corresponding with described status information, and
Internal resistance value according to described battery determines the charging duration of described pre-charge circuit.
In the present invention one specific embodiment, determine status information with charging duration corresponding relation, specifically include: calculate with
The internal resistance value of the described battery that status information is corresponding；According to calculated described internal resistance value and default dash current threshold value,
The maximum voltage difference at the capacitor two ends in calculating battery two ends and above-mentioned pre-charge circuit；According to described maximum voltage difference and institute
State the state-of-charge SOC of battery, determine the charging duration of described pre-charge circuit；By the above-mentioned charging duration determined and described shape
State information carries out correspondence.
It is noted that the above method of embodiment of the present invention offer and battery management system, can apply to load
In the various types of vehicles of battery, such as: electric automobile, hybrid vehicle etc..
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all essences in the application
Within god and principle, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the application protection.
Claims (9)
1. the control method of a pre-charge circuit, it is characterised in that including:
The status information of the battery in monitoring pre-charge circuit；
According to the described status information monitored, determine the charging duration of described pre-charge circuit；
According to the described charging duration determined, the capacitor in described pre-charge circuit is charged.
2. the method for claim 1, it is characterised in that according to the described status information monitored, determine described preliminary filling
The charging duration of electricity circuit, specifically includes:
According to the corresponding relation of predetermined status information with charging duration, search corresponding with the described status information monitored
The charging duration of described pre-charge circuit；Or,
According to the described status information monitored, calculate the internal resistance value of the described battery corresponding with described status information, and according to
The internal resistance value of described battery determines the charging duration of described pre-charge circuit.
3. method as claimed in claim 2, it is characterised in that determine the corresponding relation of status information and charging duration, specifically
Including:
Calculate the internal resistance value of the described battery corresponding with status information；
According to calculated described internal resistance value and default dash current threshold value, calculate battery two ends and above-mentioned pre-charge circuit
In the maximum voltage difference at capacitor two ends；
State-of-charge SOC according to described maximum voltage difference and described battery, determines the charging duration of described pre-charge circuit；
The above-mentioned charging duration determined is carried out corresponding with described status information.
4. the method as described in any one in claims 1 to 3, it is characterised in that described status information includes: state-of-charge
One or more in SOC, health status SOH, temperature.
5. a battery management system, it is characterised in that including:
Monitoring means, for monitoring the status information of the battery in pre-charge circuit；
Determine unit, for according to the described status information monitored, determining the charging duration of described pre-charge circuit；
Control unit, for being charged the capacitor in described pre-charge circuit according to the described charging duration determined.
6. battery management system as claimed in claim 5, it is characterised in that described determine unit specifically for:
According to the corresponding relation of predetermined status information with charging duration, search corresponding with the described status information monitored
The charging duration of described pre-charge circuit；Or,
According to the described status information monitored, calculate the internal resistance value of the described battery corresponding with described status information, and according to
The internal resistance value of described battery determines the charging duration of described pre-charge circuit.
7. method as claimed in claim 6, it is characterised in that determine the corresponding relation of status information and charging duration, specifically
Including:
Calculate the internal resistance value of the described battery corresponding with status information；
According to calculated described internal resistance value and default dash current threshold value, calculate battery two ends and above-mentioned pre-charge circuit
In the maximum voltage difference at capacitor two ends；
State-of-charge SOC according to described maximum voltage difference and described battery, determines the charging duration of described pre-charge circuit；
The above-mentioned charging duration determined is carried out corresponding with described status information.
8. the battery management system as described in any one in claim 5～7, it is characterised in that described status information includes:
One or more in state-of-charge SOC, health status SOH, temperature.
9. a vehicle, it is characterised in that include the battery management system described in any one in the claims 5～8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610615725.0A CN106100059A (en) | 2016-07-29 | 2016-07-29 | The control method of pre-charge circuit, battery management system and vehicle |
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| CN201610615725.0A CN106100059A (en) | 2016-07-29 | 2016-07-29 | The control method of pre-charge circuit, battery management system and vehicle |
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| CN108599288A (en) * | 2018-03-23 | 2018-09-28 | 苏州博思得电气有限公司 | Power supply unit, power supply system for powering to high-tension apparatus and high-tension apparatus |
| CN112886671A (en) * | 2021-03-05 | 2021-06-01 | 深圳逸驰云动科技有限公司 | Battery charging state detection method, detection device and charging device |
| CN113748043A (en) * | 2021-04-30 | 2021-12-03 | 华为数字能源技术有限公司 | Charger, slow starting method, electric vehicle and charging system |
| CN113873836A (en) * | 2021-09-24 | 2021-12-31 | 珠海格力电器股份有限公司 | Temperature and humidity control method and device of frequency converter, frequency converter and air conditioning unit |
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Application publication date: 20161109 |