CN102403767A - Battery discharge control method and device - Google Patents
Battery discharge control method and device Download PDFInfo
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- CN102403767A CN102403767A CN2011103731202A CN201110373120A CN102403767A CN 102403767 A CN102403767 A CN 102403767A CN 2011103731202 A CN2011103731202 A CN 2011103731202A CN 201110373120 A CN201110373120 A CN 201110373120A CN 102403767 A CN102403767 A CN 102403767A
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Abstract
The invention discloses a battery discharge control method and device, which relates to the control field. The method comprises the following steps of: obtaining a current status parameter of a battery, and obtaining a current status parameter of a motor; determining maximal discharge power currently allowed by the battery according to the current status parameter of the battery and the current status parameter of the motor; and receiving a discharge request, and controlling the battery to discharge according to the power of the discharge request and the maximal discharge power currently allowed by the battery. The battery discharge method and device provided by the invention control the battery to discharge according to the power of the discharge request and the maximal discharge power currently allowed by the battery so as to reduce battery overdischarge phenomenon and enhance battery performance.
Description
Technical field
The present invention relates to the control field, particularly battery discharge control method and equipment.
Background technology
Along with the development of new energy technology, electric automobile more and more receives people's attention, and battery is the core part of electric automobile as the power source of electric automobile, for guaranteeing the work and the durability of battery-efficient, need discharge to battery and control and management.
In the prior art, when battery discharge was controlled, mostly according to the rated power of discharge requested power with battery, the control battery discharge promptly, when discharge requested power during greater than the rated power of battery, was controlled battery discharge according to the rated power of battery; When the discharge requested power is not more than the rated power of battery, according to discharge requested power control battery discharge.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Prior art is when controlling the discharge of battery; Because factor affecting such as environment; The rated power of battery can not accurately embody the current actual performance of battery, and possibly there is the battery over-discharge phenomenon in control to the rated power degree of dependence battery to battery discharge, influences battery performance.
Summary of the invention
In order to reduce the battery over-discharge phenomenon, improve battery performance, the embodiment of the invention provides a kind of battery discharge control method and equipment.
The embodiment of the invention adopts following technical scheme:
A kind of battery discharge control method comprises:
Obtain the battery current state parameter, and obtain the motor current state parameter;
Confirm the maximum discharge power of the current permission of battery according to said battery current state parameter and said motor current state parameter;
Receive the discharge request, according to the maximum discharge power of said discharge requested power and the current permission of said battery, the control battery discharge.
A kind of battery discharge control appliance comprises:
Acquisition module is used to obtain the battery current state parameter, and obtains the motor current state parameter;
Determination module is used for confirming according to said battery current state parameter and said motor current state parameter the maximum discharge power of the current permission of battery;
Control module is used for receiving the discharge request, according to the maximum discharge power of said discharge requested power and the current permission of said battery, and the control battery discharge.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
Through battery status parameter and motor status parameter according to detection in real time; Accurately draw the current performance state of battery and motor, to the discharge of battery control the time, dynamically adjust the maximum discharge power of the current permission of battery according to battery and the current performance state of motor; According to the maximum discharge power of the current permission of battery the discharge requested power is controlled again; Guarantee battery operatedly, can reduce the battery over-discharge phenomenon, can improve the battery performance extending battery life in the regular picture scope.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the battery discharge control method that provides of the embodiment of the invention 1;
Fig. 2 is the flow chart of the battery discharge control method that provides of the embodiment of the invention 2;
Fig. 3 is the structural representation of the battery discharge control appliance that provides of the embodiment of the invention 3;
Fig. 4 is the structural representation of the another kind of battery discharge control appliance that provides of the embodiment of the invention 3.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
The embodiment of the invention provides a kind of battery discharge control method, and is as shown in Figure 1, comprising:
101, obtain the battery current state parameter, and obtain the motor current state parameter.
102, confirm the maximum discharge power of the current permission of battery according to battery current state parameter and motor current state parameter.
103, receive the discharge request, according to the maximum discharge power of said discharge requested power and the current permission of said battery, the control battery discharge.
The battery discharge control method that the embodiment of the invention provides; Battery status parameter and motor status parameter according to real-time detection accurately draw the current performance state of battery and motor, when the discharge of battery is controlled; Dynamically adjust the maximum discharge power of the current permission of battery according to battery and the current performance state of motor; According to the maximum discharge power of the current permission of battery the discharge requested power is controlled again, make battery operated in the regular picture scope, the battery discharge control method that adopts the embodiment of the invention to provide; The battery over-discharge phenomenon can be reduced, the battery performance extending battery life can be improved.
Embodiment 2
Based on the battery discharge control method that embodiment 1 provides, the embodiment of the invention provides a kind of battery discharge control method, and is as shown in Figure 2, comprising:
201, obtain the battery current state parameter.
Particularly, when realizing the embodiment of the invention, can receive the battery current state parameter that battery manager sends, also can active detecting battery current state, obtain the battery current state parameter.Wherein, the battery current state parameter comprises the maximum discharge current I of the current permission of battery
Limit, the current permission of battery minimum discharge voltage V
Limit, battery Current Temperatures t, the current minimum monomer voltage V of battery
Cell
202, obtain the motor current state parameter.
Particularly, when realizing the embodiment of the invention, can receive the motor current state parameter that the motor manager sends, also can active detecting motor current state, obtain the motor current state parameter.Wherein, the motor current state parameter comprises the current rotating speed of motor.
Need to prove that above-mentioned 201,202 orders also can be carried out in no particular order simultaneously.
203, confirm the maximum discharge power of the current permission of battery according to battery current state parameter and motor current state parameter.
Particularly; The embodiment of the invention is when confirming the maximum discharge power of the current permission of battery; Need be foundation with the maximum discharge power of cell integrated current permission, the maximum discharge power of the current permission of battery cell, the maximum power of the current permission of motor, the method that draws of three power sees for details following:
1, confirms the maximum discharge power of cell integrated current permission according to the battery current state parameter, the maximum discharge current I of the current permission of battery that comprises with the battery current state parameter
Limit, the current permission of battery minimum discharge voltage V
Limit, battery Current Temperatures t, according to formula P
Batt=P
Raw+ P
DeltaConfirm the maximum discharge power of cell integrated current permission, wherein P
BattBe the maximum discharge power of cell integrated current permission, P
RawThe maximum discharge current I of the current permission of=battery
LimitThe minimum discharge voltage V of the current permission of * battery
Limit, P
DeltaBe battery discharge power correction value, P
DeltaCan obtain according to the battery discharge power accuracy table that battery Current Temperatures t inquiry prestores.
Wherein, The embodiment of the invention is before the whole discharge power of counting cell; Battery temperature that draws according to experiment and the corresponding relation between the battery discharge power correction value are set up the battery discharge power accuracy table, and storage battery discharge power accuracy table; There is the corresponding battery discharge power correction value of a series of battery temperature values in the table, inquires about during the maximum discharge power of the cell integrated current battery that allows to be calculated.
For example, suppose that current battery temperature is 25 degree, the maximum discharge current I of the current permission of battery in the battery current state parameter of obtaining
LimitBe A, the minimum discharge voltage V of the current permission of battery
LimitBe B.In the battery discharge power accuracy table, check in the corresponding battery discharge power correction value P of 25 degree
DeltaBe N, then the maximum discharge power P of the 25 cell integrated current batteries that allow when spending
Raw=A * B+N.
2, confirm the maximum discharge power of the current permission of battery cell according to the battery current state parameter, be specially, join the current minimum monomer voltage V of battery that comprises according to the battery current state
Cell, inquire about the battery cell discharge power table that prestores, obtain the maximum discharge power of the current permission of battery cell.
Wherein, the embodiment of the invention before counting cell monomer discharge power, the minimum monomer voltage V of battery that draws according to experiment
CellThe corresponding relation of the maximum discharge power of battery that allows with battery is set up battery cell discharge power table, and storage battery monomer discharge power table, the minimum monomer voltage V of the table a series of batteries of stored
CellThe maximum discharge power that corresponding battery cell allows is inquired about minimum monomer voltage V in the embodiment of the invention during the maximum discharge power of the cell integrated current battery that allows to be calculated
CellDraw according to test experiments, when the actual monomer voltage of battery is lower than minimum monomer voltage,, need limit battery discharge power in order to protect battery.
In the practice, the current minimum monomer voltage V of the battery in the battery current state parameter of for example obtaining
CellBe C, the maximum discharge power D of the battery that the battery cell that the C that will in battery cell discharge power table, check in is corresponding allows is as the maximum discharge power of the current permission of battery cell.
3, the embodiment of the invention is before the maximum power of calculating the current permission of motor; Set up in the power of motor table according to the maximum discharge power of the battery of motor speed and cell integrated permission and the corresponding relation of the maximum power of motor permission; And preserve the power of motor table, inquire about during the maximum power of the current permission of motor to be calculated, in the practice; Also can be with data in the power of motor table with the stored in form of three-dimensional coordinate; For example with motor speed as the X axle, the maximum discharge power of cell integrated permission is as the Y axle, the maximum power that motor allows is drawn out three's coordinate corresponding relation as the Z axle.
Confirm the maximum power of the current permission of motor according to the motor current state parameter; The current rotating speed of motor that comprises with the motor current state parameter; The three-dimensional coordinate of the maximum discharge power of power of motor table that prestores according to the maximum discharge power inquiry of the cell integrated current permission that draws in the current rotating speed of motor and above-mentioned 1 or the motor speed that prestores, cell integrated permission, maximum power corresponding relation foundation that both allow with motor obtains the maximum power of the current permission of motor.
Get the maximum discharge power of the cell integrated current permission that above-mentioned 1,2,3 computation of table lookup confirm, the maximum discharge power of the current permission of battery cell, the maximum power of the current permission of motor, the reckling in three power is as the current maximum discharge power of battery.
204, receive the discharge request, according to the maximum discharge power of discharge requested power and the current permission of battery, the control battery discharge.
Particularly, the maximum discharge power of discharge requested power that receives and the current permission of battery is carried out size relatively, the control of discharging comprises following two kinds of situations to battery according to comparative result:
Feelings row one is if the discharge requested power is greater than the maximum discharge power of the current permission of battery, according to the maximum discharge power control battery discharge of the current permission of battery.When under this situation battery discharge being controlled, the discharge power of battery can not be greater than the maximum discharge power of the current permission of battery, and avoiding battery overcurrent condition to occur influences battery performance.
Feelings row two is if the discharge requested power is less than or equal to the maximum discharge power of the current permission of battery, according to discharge requested power control battery discharge.
Need to prove that the embodiment of the invention is dynamic control to the discharge control that battery carries out, in the said circumstances two; After the output of discharge requested power control battery; Because the maximum discharge power of discharge requested power and the current permission of battery changes, when the discharge requested power occurring greater than the situation of the maximum discharge power of the current permission of battery, still need be by the control mode of said circumstances one; Maximum discharge power control battery discharge according to the current permission of battery; Battery discharge is controlled, made the discharge power of battery not prevent battery over-discharge greater than the maximum discharge power of the current permission of battery.In like manner, in the said circumstances one, behind the maximum discharge power control battery discharge according to the current permission of battery, when appearance discharge requested power is less than or equal to the maximum discharge power of the current permission of battery, need according to discharge requested power control battery discharge.
The battery discharge control method that the embodiment of the invention provides; Battery status parameter and motor status parameter according to real-time detection accurately draw the current performance state of battery and motor, when the discharge of battery is controlled; Dynamically adjust the maximum discharge power of the current permission of battery according to battery and the current performance state of motor; According to the maximum discharge power of the current permission of battery the discharge requested power is controlled again, make battery operated in the regular picture scope, the battery discharge control method that adopts the embodiment of the invention to provide; The battery over-discharge phenomenon can be reduced, the battery performance extending battery life can be improved.
Embodiment 3
The embodiment of the invention provides a kind of battery discharge control appliance, and this equipment can be used for the electrokinetic cell discharge control system of electric automobile, and is as shown in Figure 3, and this equipment comprises: acquisition module 301, determination module 302, control module 303.
Wherein, acquisition module 301 is used to obtain the battery current state parameter, and obtains the motor current state parameter.
Particularly, see also Fig. 4, acquisition module 301 comprises: first acquisition module 3011, second acquisition module 3012.
Wherein, first acquiring unit 3011 is used to receive the battery current state parameter that battery manager sends, and perhaps active detecting battery current state obtains the battery current state parameter.
Further, see also Fig. 4, determination module 302 comprises: 3021, second definite unit 3022, first definite unit, maximum discharge power are confirmed unit 3023.
Particularly, first confirms unit 3021, is used for confirming the maximum discharge power of the cell integrated current battery that allows according to the battery current state parameter.Particularly, definite method of the discharge power of cell integrated current permission here sees also the step 203 in the embodiment of the invention 2, repeats no more at this.
First confirms unit 3021, also is used for confirming the maximum discharge power of the current battery that allows of battery cell according to the battery current state parameter.Particularly, definite method of the discharge power of the current permission of battery cell here sees also the step 203 in the embodiment of the invention 2, repeats no more at this.
Second confirms unit 3022, is used for confirming the current maximum power that allows of motor according to the motor current state parameter.Particularly, the power determining method of the current permission of motor here sees also the step 203 in the embodiment of the invention 2, repeats no more at this.
Maximum discharge power is confirmed unit 3023, and the minimum power that is used for the first maximum discharge power of the cell integrated current battery that allows confirming to confirm unit 3021 and the maximum discharge power of the current battery that allows of battery cell, second are confirmed the current maximum power three who allows of motor that unit 3022 is confirmed is as the current maximum discharge power of battery.
Further again, see also Fig. 4, control module 303 comprises: first control unit 3031, second control unit 3032.
The battery discharge control appliance that the embodiment of the invention provides is the concrete application of the battery discharge control method that provides of the embodiment of the invention, and part is to the greatest extent asked for an interview the associated description of the battery discharge control method part that the invention described above embodiment provides.
The battery discharge control appliance that the embodiment of the invention provides; The motor status parameter that battery status parameter of obtaining according to first acquiring unit and second acquisition unit obtain; Accurately draw battery and the current performance state of motor by determination module; Control module is dynamically adjusted the maximum discharge power of the current permission of battery according to battery and the current performance state of motor to the discharge of battery control the time, according to the maximum discharge power of the current permission of battery the requested power of discharging is controlled again; Make battery operated in the regular picture scope; The battery discharge control appliance method that adopts the embodiment of the invention to provide can reduce the battery over-discharge phenomenon, can improve the battery performance extending battery life.
Battery discharge control method and equipment that the embodiment of the invention provides can reduce the battery over-discharge phenomenon, strengthen battery performance, and extending battery life is when the embodiment of the invention is mainly used in electric automobile power battery control.
Need to prove: the battery discharge control appliance that the foregoing description provides; When statement; Only the division with above-mentioned each functional module is illustrated, and in the practical application, can as required the above-mentioned functions distribution be accomplished by different functional; The internal structure of the equipment of being about to is divided into the functional module of putting through, to accomplish above-mentioned all or part of function.In addition, battery discharge control appliance and battery discharge control method that the foregoing description provides belong to same design, and its concrete implementation procedure sees method embodiment for details, repeats no more here.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than be merely preferred embodiment of the present invention, or not all within spirit of the present invention and principle in order to restriction the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a battery discharge control method is characterized in that, comprising:
Obtain the battery current state parameter, and obtain the motor current state parameter;
Confirm the maximum discharge power of the current permission of battery according to said battery current state parameter and said motor current state parameter;
Receive the discharge request, according to the maximum discharge power of said discharge requested power and the current permission of said battery, the control battery discharge.
2. battery discharge control method according to claim 1 is characterized in that, said maximum discharge power according to said discharge requested power and the current permission of said battery, and the control battery discharge comprises:
If said discharge requested power is greater than the maximum discharge power of the current permission of said battery, according to the maximum discharge power control battery discharge of the current permission of said battery;
If said discharge requested power is less than or equal to the maximum discharge power of the current permission of said battery, according to said discharge requested power control battery discharge.
3. battery discharge control method according to claim 1 is characterized in that, the said battery current state parameter of obtaining comprises:
Receive the said battery current state parameter that battery manager sends; Or
Detect the battery current state, obtain said battery current state parameter;
The said motor current state parameter of obtaining comprises:
Receive the said motor current state parameter that the motor manager sends; Or
Detect the motor current state, obtain said motor current state parameter.
4. battery discharge control method according to claim 1 is characterized in that, saidly confirms that according to said battery current state parameter and said motor current state parameter the maximum discharge power of the current permission of battery comprises:
Confirm the maximum discharge power of cell integrated current permission and the maximum discharge power of the current permission of battery cell according to said battery current state parameter;
Confirm the maximum power of the current permission of motor according to said motor current state parameter;
With the maximum discharge power of the minimum value in the maximum power of the maximum discharge power of said cell integrated current permission, the maximum discharge power of the current permission of said battery cell, the current permission of said motor as the current permission of said battery.
5. battery discharge control method according to claim 4 is characterized in that, said battery current state parameter comprises the maximum discharge current I of the current permission of battery
Limit, the current permission of battery minimum discharge voltage V
Limit, battery Current Temperatures t, the current minimum monomer voltage V of battery
Cell, said motor current state parameter comprises the current rotating speed of motor;
Saidly confirm to be specially the maximum discharge power of cell integrated current permission according to said battery current state parameter:
According to P
Batt=P
Raw+ P
DeltaConfirm the cell integrated current battery that allows maximum discharge power, wherein P
BattBe the maximum discharge power of the cell integrated current battery that allows, P
RawThe maximum discharge current I of the current permission of=battery
LimitThe minimum discharge voltage V of the current permission of * battery
Limit, P
DeltaBe the battery discharge power correction value, search the battery discharge power accuracy table that prestores according to said battery Current Temperatures t and obtain; Said battery discharge power accuracy table is set up according to the corresponding relation of battery temperature and battery discharge power correction value;
Saidly confirm to be specially the maximum discharge power of the current permission of battery cell according to said battery current state parameter:
According to the current minimum monomer voltage V of battery
Cell, search the battery cell discharge power table that prestores, obtain the discharge power of the current permission of battery cell; Said battery cell discharge power table is set up according to the corresponding relation of the maximum discharge power of minimum monomer voltage of battery and battery cell permission;
Saidly confirm to be specially the maximum power of the current permission of motor according to said motor current state parameter:
Search the power of motor table that prestores according to the discharge power of current rotating speed of motor and cell integrated current permission, obtain the power of the current permission of motor; Said power of motor table is set up according to the corresponding relation of the maximum power that the discharge power of motor speed and cell integrated permission and motor allow.
6. a battery discharge control appliance is characterized in that, comprising:
Acquisition module is used to obtain the battery current state parameter, and obtains the motor current state parameter;
Determination module is used for confirming according to said battery current state parameter and said motor current state parameter the maximum discharge power of the current permission of battery;
Control module is used for receiving the discharge request, according to the maximum discharge power of said discharge requested power and the current permission of said battery, and the control battery discharge.
7. battery discharge control appliance according to claim 6 is characterized in that, said control module comprises:
First control unit is if be used for the maximum discharge power of said discharge requested power greater than the current permission of said battery, according to the maximum discharge power control battery discharge of the current permission of said battery;
Second control unit is if be used for the maximum discharge power that said discharge requested power is less than or equal to the current permission of said battery, according to said discharge requested power control battery discharge.
8. battery discharge control appliance according to claim 6 is characterized in that, said acquisition module comprises:
First acquiring unit is used to receive the said battery current state parameter that battery manager sends; Or detect said battery current state, obtain said battery current state parameter;
Second acquisition unit is used to receive the said motor current state parameter that the motor manager sends; Or detect the motor current state, obtain said motor current state parameter.
9. battery discharge control appliance according to claim 6 is characterized in that, said determination module comprises:
First confirms the unit, is used for confirming the maximum discharge power of cell integrated current permission and the maximum discharge power of the current permission of battery cell according to said battery current state parameter;
Second confirms the unit, is used for confirming according to said motor current state parameter the maximum power of the current permission of motor;
Maximum discharge power is confirmed the unit, is used for the minimum value of the maximum power of the maximum discharge power of said cell integrated current permission, the maximum discharge power of the current permission of said battery cell, the current permission of the said motor maximum discharge power as the current permission of said battery.
10. battery discharge control appliance according to claim 9 is characterized in that, said battery current state parameter comprises the maximum discharge current I of the current permission of battery
Limit, the current permission of battery minimum discharge voltage V
Limit, battery Current Temperatures t, the current minimum monomer voltage V of battery
Cell, said motor current state parameter comprises the current rotating speed of motor;
Said first confirms the unit, specifically is used for according to P
Batt=P
Raw+ P
DeltaConfirm the cell integrated current battery that allows maximum discharge power, wherein P
BattBe the maximum discharge power of the cell integrated current battery that allows, P
RawThe maximum discharge current I of the current permission of=battery
LimitThe minimum discharge voltage V of the current permission of * battery
Limit, P
DeltaBe the battery discharge power correction value, search the battery discharge power accuracy table that prestores according to said battery Current Temperatures t and obtain; Said battery discharge power accuracy table is set up according to the corresponding relation of battery temperature and battery discharge power correction value;
Said first confirms the unit, also specifically is used for according to the current minimum monomer voltage V of battery
Cell, search the battery cell discharge power table that prestores, obtain the discharge power of the current permission of battery cell; Said battery cell discharge power table is set up according to the corresponding relation of the maximum discharge power of minimum monomer voltage of battery and battery cell permission;
Said second confirms the unit, specifically is used for searching the power of motor table that prestores according to the discharge power of current rotating speed of motor and cell integrated current permission, obtains the power of the current permission of motor; Said power of motor table is set up according to the corresponding relation of the maximum power that the discharge power of motor speed and cell integrated permission and motor allow.
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