CN104267353A - Battery electrical charge state prediction correcting system and correcting method - Google Patents
Battery electrical charge state prediction correcting system and correcting method Download PDFInfo
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Abstract
The invention provides a battery electrical charge state prediction correcting system and a correcting method. The system comprises a detecting unit, a judging unit and a processing unit, wherein the detecting unit is used for detecting the current direction and the current magnitude of a battery pack, the judging unit is connected with the detecting unit and used for judging the state of the battery pack according to the detected current direction and the detected current magnitude, the processing unit is connected with the judging unit and used for executing the battery electrical charge state prediction correcting operation after the preset time quantum according to the state of the battery pack. According to the battery electrical charge state prediction correcting system and the correcting method, the corresponding battery electrical charge state prediction correcting operation can be executed according to different states of the battery pack, it is not limited to the fact that in the prior art, charging resetting to 100 percent can be carried out only at the charging finishing state, and therefore the prediction accuracy of the battery electrical charge state can be improved.
Description
Technical field
The present invention relates to technical field of battery management, more specifically, relate to a kind of cell charge state prediction update the system and modification method.
Background technology
Recently, Development of Electric Vehicles is rapid, and the power resources of electric automobile are exactly battery.But at present, battery technology is also immature.For the jejune present situation of battery technology, the management carrying out science to it in the use procedure of battery just seems especially important.Such as, prediction for battery remaining power (i.e. battery charge state (SOC)) is the task that fundamental sum is primary the most, whether its value is accurate, can have influence on the decision mode of power-supply management system, and then can affect the utilization power of electric battery power performance.
The accurate measurements of battery charge state not only can provide energy content of battery state of supply for driver, and the SOC value of battery can the degree of characterizing battery charge or discharge, overcharge and the overdischarge of battery can be prevented thus, thus extend the serviceable life of battery; The important evidence of energy distribution in SOC or power-supply management system, the foundation that battery management system distributes energy is exactly the SOC value of battery and the size of bearing power, if the value of SOC is inaccurate, the imbalance that power-supply management system controls energy distribution will be caused, under high-power operating mode, battery can not have enough energy reserves, or battery has had the deposit of enough electricity, power-supply management system but still sends operation instruction to engine (in hybrid vehicle), thus causes power dissipation.In addition, the Accurate Prediction of SOC value can also reduce the use cost of battery, because SOC value can extend the serviceable life of battery to a certain extent accurately, thus reduces the use cost of battery.As can be seen here, correction calibration is carried out to SOC prediction particularly important to obtain SOC value accurately.
But in the prior art, usual SOC can only carry out SOC in charging complete state and reset 100%, and stopping charging SOC in charging process cannot reset.For battery power discharge, for protection electric battery is by putting damage, battery power discharge SOC also cannot reset clearing excessively.Namely, the correction calibration of SOC prediction of the prior art can only carry out charging replacement 100% in charging complete state, and the accuracy of electric battery SOC cannot ensure thus.
Summary of the invention
In view of this, the present invention is intended to propose a kind of cell charge state prediction update the system, the problem that the accuracy can only carrying out charging replacement 100%, thus electric battery SOC in charging complete state with the correction calibration solving SOC prediction in prior art cannot ensure.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of cell charge state prediction update the system, this system comprises: detecting unit, for detecting direction of current and the size of current of electric battery; Judging unit, is connected with described detecting unit, for judging the state of described electric battery according to detected direction of current and size of current; And processing unit, be connected with described judging unit, after waiting for predetermined amount of time according to the state of described electric battery, perform cell charge state prediction correction operation.
Relative to prior art, update the system of the present invention has following advantage:
By detecting direction of current and the size of current of electric battery, the state of electric battery can be judged, and then perform cell charge state prediction correction operation after predetermined amount of time can being waited for according to the state of electric battery.Like this, corresponding cell charge state prediction correction operation can be performed according to the different conditions of electric battery.
Update the system of the present invention can perform corresponding cell charge state prediction correction operation for the different conditions of electric battery, no longer be limited to and of the prior artly can only carry out charging replacement 100% in charging complete state, the accuracy of cell charge state prediction can be improved thus.
Another object of the present invention is to propose a kind of cell charge state prediction modification method, the problem that the accuracy can only carrying out charging replacement 100%, thus electric battery SOC in charging complete state with the correction calibration solving SOC prediction in prior art cannot ensure.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of cell charge state prediction modification method, the method comprises: the direction of current and the size of current that detect electric battery; The state of described electric battery is judged according to detected direction of current and size of current; And perform cell charge state prediction correction operation according to after the state wait predetermined amount of time of described electric battery.
The Dominant Facies that described modification method and above-mentioned update the system have relative to prior art is same, does not repeat them here.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the block scheme of the cell charge state prediction update the system described in the embodiment of the present invention; And
Fig. 2 is the process flow diagram of the cell charge state prediction modification method described in the embodiment of the present invention.
Description of reference numerals:
10-detecting unit, 12-judging unit, 14-processing unit.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 1 is the block scheme of the cell charge state prediction update the system described in the embodiment of the present invention.
As shown in Figure 1, the cell charge state prediction update the system described in the embodiment of the present invention comprises: detecting unit 10, for detecting direction of current and the size of current of electric battery; Judging unit 12, is connected with described detecting unit 10, for judging the state of described electric battery according to detected direction of current and size of current; And processing unit 14, be connected with described judging unit 12, after waiting for predetermined amount of time according to the state of described electric battery, perform cell charge state prediction correction operation.
Wherein, described predetermined amount of time can preset according to actual conditions, such as, can preset according to the material of the battery core of the battery in described electric battery.In addition, described predetermined amount of time can be called time of repose section, namely represents that electric battery leaves standstill duration.
By detecting direction of current and the size of current of electric battery, the state of electric battery can be judged, and then perform cell charge state prediction correction operation after predetermined amount of time can being waited for according to the state of electric battery.Like this, corresponding cell charge state prediction correction operation can be performed according to the different conditions of electric battery, no longer be limited to and of the prior artly can only carry out charging replacement 100% in charging complete state, the accuracy of cell charge state prediction can be improved thus.
Above-mentioned cell charge state prediction update the system is applied on vehicle (such as hybrid vehicle and electric automobile), the accuracy of the cell charge state prediction of vehicle can be improved, and then vehicle safe driving, lifting battery efficiency, raising vehicle performance can be ensured and extend battery life, the battery failure rate caused because SOC deviation is excessive can also be reduced simultaneously, promote economy.
According to an embodiment of the present invention, according to detected described direction of current and described size of current, described judging unit 12 judges that the state of described electric battery comprises: when described direction of current is forward and described size of current is less than predetermined value, judges that the state of described electric battery is charging termination state; When described direction of current be reverse and described size of current be less than predetermined value, judge that the state of described electric battery is discharge off state.
Wherein, described predetermined value can be that C/20, C represent battery capacity.Charging termination state can comprise charging and be full of final state (such as, charge capacity reaches the situation of 100% and stopping charging) and charging underfill final state (such as, charge capacity only reaches 50% situation just stopping charging).Thus, the update the system described in the application of the invention, no matter whether electric battery stops charging for being full of, and all can perform cell charge state prediction correction operation.
According to an embodiment of the present invention, described processing unit 14 performs described cell charge state prediction correction operation and comprises after waiting for described predetermined amount of time according to the state of described electric battery: when the state judging described electric battery is charging termination state, performs rechargeable battery state-of-charge forecast value revision and operate after waiting for described predetermined amount of time; When the state judging described electric battery is discharge off state, after waiting for described predetermined amount of time, perform the operation of discharge battery state-of-charge forecast value revision.
By judging the state of electric battery, the operation of rechargeable battery state-of-charge forecast value revision can be performed for charging termination state, and discharge off state can perform the operation of discharge battery state-of-charge forecast value revision.
According to an embodiment of the present invention, above-mentioned update the system also comprises clock unit (not shown), for exporting the described electric battery out-of-work time; The time of described judging unit 12 also for again being started working out-of-work for described electric battery time and described electric battery compares, and whether the difference judging between the time that described electric battery out-of-work time and described electric battery are started working again is greater than the numerical value that described predetermined amount of time represents; Described processing unit 14 is also for performing the operation of rechargeable battery state-of-charge forecast value revision or the operation of discharge battery state-of-charge forecast value revision when described difference is greater than described numerical value.
Wherein, the electric battery out-of-work time refers to that electric battery is no longer the time of system power supply, i.e. the system cut-off time.System cut-off usually corresponds to vehicle and is in the state do not run.The time that described electric battery is started working again refers to that electric battery is the time of system power supply again, i.e. system power-on time again.Described difference represents system cut-off duration.
By the judgement of the duration that quits work to electric battery, cell charge state prediction charging can be performed revise operation or cell charge state prediction electric discharge correction operation, to improve the accuracy of cell charge state prediction in the long-time off-duty situation of vehicle.
According to an embodiment of the present invention, described processing unit 14 performs the operation of described rechargeable battery state-of-charge forecast value revision and comprises: the charging voltage obtaining described electric battery, described charging voltage is mated with the battery charge state correction chart preset, the battery charge state value corresponding with described charging voltage is determined according to described correction chart, and using the rechargeable battery SOC of this value as described electric battery; Described processing unit 14 performs the operation of described discharge battery state-of-charge forecast value revision and comprises: the sparking voltage obtaining described electric battery, described sparking voltage is mated with described default battery charge state correction chart, the battery charge state value corresponding with described sparking voltage is determined according to described correction chart, and using the discharge battery SOC of this value as described electric battery.
Wherein, the battery charge state correction chart preset presets according to actual conditions, such as, can preset according to the temperature of the battery core of the battery in described electric battery, electric current, voltage, cycle index etc.Those skilled in the art can utilize existing setting means to set, and for succinct object, no longer repeat this.
In the above-described embodiments, detecting unit 10, judging unit 12, processing unit 14 and clock unit can be integrated in battery management system (BMS), and also can arrange separately, the present invention does not limit this.
In addition, when battery state is charged state, described time of repose section is charging time of repose section, and charging leaves standstill leaving standstill under the underfill state that is mainly used in charging; When battery state is discharge condition, described time of repose section is electric discharge time of repose section.
Alternatively, the embodiment of the present invention additionally provides a kind of cell charge state prediction update the system, and this system comprises: clock unit, for exporting the described electric battery out-of-work time; Judging unit 12, be connected with described clock unit, the time of again starting working for electric battery out-of-work time and described electric battery compares, and whether the difference judging between the time that described electric battery out-of-work time and described electric battery are started working again is greater than the numerical value that described predetermined amount of time represents; And processing unit 14, be connected with described judging unit, revise operation or cell charge state prediction electric discharge correction operation for performing cell charge state prediction charging when described difference is greater than described numerical value.
By the judgement of the duration that quits work to electric battery, cell charge state prediction charging can be performed revise operation or cell charge state prediction electric discharge correction operation, to improve the accuracy of cell charge state prediction in the long-time off-duty situation of vehicle.
According to an embodiment of the present invention, this system also comprises detecting unit 10, for detecting direction of current and the size of current of electric battery; Wherein judging unit 12 is also for judging the state of described electric battery according to detected direction of current and size of current; And processing unit 14 also performs cell charge state prediction correction operation after waiting for predetermined amount of time according to the state of described electric battery.
In above-mentioned update the system, the judgement of the state of electric battery is with identical with the update the system shown in Fig. 1 according to performing cell charge state prediction correction operation after the state wait predetermined amount of time of described electric battery, does not repeat them here.
Fig. 2 is the process flow diagram of the cell charge state prediction modification method described in the embodiment of the present invention.
As shown in Figure 2, the cell charge state prediction modification method described in the embodiment of the present invention comprises:
S200, detects direction of current and the size of current of electric battery;
S202, judges the state of described electric battery according to detected direction of current and size of current; And
S204, performs cell charge state prediction correction operation after waiting for predetermined amount of time according to the state of described electric battery.
By detecting direction of current and the size of current of electric battery, the state of electric battery can be judged, and then perform cell charge state prediction correction operation after predetermined amount of time can being waited for according to the state of electric battery.Like this, corresponding cell charge state prediction correction operation can be performed according to the different conditions of electric battery, no longer be limited to and of the prior artly can only carry out charging replacement 100% in charging complete state, the accuracy of cell charge state prediction can be improved thus.
In the method, step S202 comprises:
S2020, when described direction of current is forward and described size of current is less than predetermined value, judges that the state of described electric battery is charging termination state;
S2022, when described direction of current be reverse and described size of current be less than predetermined value, judge that the state of described electric battery is discharge off state.
Wherein, described predetermined value can represent battery capacity for C/20C.Charging termination state can comprise charging and be full of final state (such as, charge capacity reaches the situation of 100% and stopping charging) and charging underfill final state (such as, charge capacity only reaches 50% situation just stopping charging).Thus, the update the system described in the application of the invention, no matter whether electric battery stops charging for being full of, and all can perform cell charge state prediction correction operation.
In the method, step S204 comprises:
S2040, when the state judging described electric battery is charging termination state, performs the operation of rechargeable battery state-of-charge forecast value revision after waiting for described predetermined amount of time;
S2042, when the state judging described electric battery is discharge off state, performs the operation of discharge battery state-of-charge forecast value revision after waiting for described predetermined amount of time.
According to an embodiment of the present invention, the method also comprises:
Obtain the described electric battery out-of-work time;
Compared the time that out-of-work for described electric battery time and electric battery start working again, whether the difference judging between the time that described electric battery out-of-work time and described electric battery are started working again is greater than the numerical value that described predetermined amount of time represents;
The operation of rechargeable battery state-of-charge forecast value revision or the operation of discharge battery state-of-charge forecast value revision is performed when described difference is greater than described numerical value.
Alternatively, also above-mentioned steps can be performed before step S200 to S204.
In the method, perform the operation of described rechargeable battery state-of-charge forecast value revision to comprise: the charging voltage obtaining described electric battery, described charging voltage is mated with the battery charge state correction chart preset, the battery charge state value corresponding with described charging voltage is determined according to described correction chart, and using the rechargeable battery SOC of this value as described electric battery; Perform the operation of described discharge battery state-of-charge forecast value revision to comprise: the sparking voltage obtaining described electric battery, described sparking voltage is mated with described default battery charge state correction chart, the battery charge state value corresponding with described sparking voltage is determined according to described correction chart, and using the discharge battery SOC of this value as described electric battery.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a cell charge state prediction update the system, wherein, described cell charge state prediction update the system comprises:
Detecting unit (10), for detecting direction of current and the size of current of electric battery;
Judging unit (12), is connected with described detecting unit (10), for judging the state of described electric battery according to detected direction of current and size of current; And
Processing unit (14), is connected with described judging unit (12), after waiting for predetermined amount of time according to the state of described electric battery, perform cell charge state prediction correction operation.
2. cell charge state prediction update the system according to claim 1, wherein, according to detected described direction of current and described size of current, described judging unit (12) judges that the state of described electric battery comprises:
When described direction of current is forward and described size of current is less than predetermined value, judge that the state of described electric battery is charging termination state;
When described direction of current be reverse and described size of current be less than predetermined value, judge that the state of described electric battery is discharge off state.
3. cell charge state prediction update the system according to claim 2, wherein, described processing unit (14) performs described cell charge state prediction correction operation and comprises after waiting for described predetermined amount of time according to the state of described electric battery:
When the state judging described electric battery is charging termination state, after waiting for described predetermined amount of time, perform the operation of rechargeable battery state-of-charge forecast value revision;
When the state judging described electric battery is discharge off state, after waiting for described predetermined amount of time, perform the operation of discharge battery state-of-charge forecast value revision.
4. cell charge state prediction update the system according to claim 1, wherein,
Described system also comprises clock unit, for exporting the described electric battery out-of-work time;
The time of described judging unit (12) also for again being started working out-of-work for described electric battery time and described electric battery compares, and whether the difference judging between the time that described electric battery out-of-work time and described electric battery are started working again is greater than the numerical value that described predetermined amount of time represents;
Described processing unit (14) is also for performing the operation of rechargeable battery state-of-charge forecast value revision or the operation of discharge battery state-of-charge forecast value revision when described difference is greater than described numerical value.
5. the cell charge state prediction update the system according to claim 3 or 4, wherein,
Described processing unit (14) performs the operation of described rechargeable battery state-of-charge forecast value revision and comprises: the charging voltage obtaining described electric battery, described charging voltage is mated with the battery charge state correction chart preset, the battery charge state value corresponding with described charging voltage is determined according to described correction chart, and using the rechargeable battery SOC of this value as described electric battery;
Described processing unit (14) performs the operation of described discharge battery state-of-charge forecast value revision and comprises: the sparking voltage obtaining described electric battery, described sparking voltage is mated with described default battery charge state correction chart, the battery charge state value corresponding with described sparking voltage is determined according to described correction chart, and using the discharge battery SOC of this value as described electric battery.
6. a cell charge state prediction modification method, wherein, described cell charge state prediction modification method comprises:
Detect direction of current and the size of current of electric battery;
The state of described electric battery is judged according to detected direction of current and size of current; And
Cell charge state prediction correction operation is performed after waiting for predetermined amount of time according to the state of described electric battery.
7. according to detected described direction of current and described size of current, cell charge state prediction modification method according to claim 6, wherein, describedly judges that the state of described electric battery comprises:
When described direction of current is forward and described size of current is less than predetermined value, judge that the state of described electric battery is charging termination state;
When described direction of current be reverse and described size of current be less than predetermined value, judge that the state of described electric battery is discharge off state.
8. cell charge state prediction modification method according to claim 7, wherein, the described state according to described electric battery performs described cell charge state prediction correction operation and comprises after waiting for described predetermined amount of time:
When the state judging described electric battery is charging termination state, after waiting for described predetermined amount of time, perform the operation of rechargeable battery state-of-charge forecast value revision;
When the state judging described electric battery is discharge off state, after waiting for described predetermined amount of time, perform the operation of discharge battery state-of-charge forecast value revision.
9. cell charge state prediction modification method according to claim 6, wherein, the method also comprises:
Obtain the described electric battery out-of-work time;
Compared the time that out-of-work for described electric battery time and described electric battery start working again, whether the difference judging between the time that described electric battery out-of-work time and described electric battery are started working again is greater than the numerical value that described predetermined amount of time represents;
The operation of rechargeable battery state-of-charge forecast value revision or the operation of discharge battery state-of-charge forecast value revision is performed when described difference is greater than described numerical value.
10. cell charge state prediction modification method according to claim 8 or claim 9, wherein,
Perform the operation of described rechargeable battery state-of-charge forecast value revision to comprise: the charging voltage obtaining described electric battery, described charging voltage is mated with the battery charge state correction chart preset, the battery charge state value corresponding with described charging voltage is determined according to described correction chart, and using the rechargeable battery SOC of this value as described electric battery;
Perform the operation of described discharge battery state-of-charge forecast value revision to comprise: the sparking voltage obtaining described electric battery, described sparking voltage is mated with described default battery charge state correction chart, the battery charge state value corresponding with described sparking voltage is determined according to described correction chart, and using the discharge battery SOC of this value as described electric battery.
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| CN107546433A (en) * | 2017-09-01 | 2018-01-05 | 华霆（合肥）动力技术有限公司 | Battery information processing method and processing device |
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