CN104678317A - Method and device for detecting capacity fading of power lithium battery - Google Patents
Method and device for detecting capacity fading of power lithium battery Download PDFInfo
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- CN104678317A CN104678317A CN201510097322.7A CN201510097322A CN104678317A CN 104678317 A CN104678317 A CN 104678317A CN 201510097322 A CN201510097322 A CN 201510097322A CN 104678317 A CN104678317 A CN 104678317A
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Abstract
The invention provides a method and device for detecting the capacity fading of a power lithium battery, and relates to the technical field of electric vehicles. The method comprises the following steps: obtaining the historical data of charging and discharging the power lithium battery; according to the historical data of charging and discharging, generating a relation curve between the capacity and the time of the power lithium battery; according to the relation curve, determining the power lithium battery capacities corresponding to all the time sampling points; obtaining an initial capacity and a current capacity of the power lithium battery among the power lithium battery capacities corresponding to all the time sampling points; according to the initial capacity and the current capacity, determining the rate of the capacity fading of the power lithium battery. According to the method and device disclosed by the invention, the problem in the prior art that a professional instrument is needed to detect the capacity fading situation of the power lithium battery is solved, the process is tedious and complex, and the normal operation of an electric vehicle is influenced.
Description
Technical field
The present invention relates to electric vehicle engineering field, particularly relate to a kind of detection method and device of dynamic lithium battery capacity attenuation.
Background technology
Along with petering out of current oil resource, the prospect of fuel-engined vehicle causes anxiety.Current is that the electric automobile of power grows up gradually with dynamic lithium battery.Electric automobile refers to vehicle power to be power, drives the automobile of wheels travel with motor.And dynamic lithium battery is generally the critical energy of electric automobile.
Along with the Long-Time Service of dynamic lithium battery, its capacity is also being decayed gradually, and dynamic lithium battery capacity attenuation to be electric automobile promote the use of must faced by problem.What the capacity attenuation situation of electrokinetic cell determined electrokinetic cell can use value.Current, to accurately determine the capacity of electrokinetic cell, generally need to carry out capacity check by special instrument to electrokinetic cell, process is very complicated comparatively, and when carrying out capacity check to dynamic lithium battery, electric automobile cannot normally run.
Summary of the invention
The embodiment of the present invention provides a kind of detection method and device of dynamic lithium battery capacity attenuation, detects dynamic lithium battery capacity attenuation situation need special instrument, process very complicated to solve in prior art, and affects the problem that electric automobile normally runs.
In order to achieve the above object, the present invention adopts following technical scheme:
A detection method for dynamic lithium battery capacity attenuation, comprising:
Obtain the discharge and recharge historical data of dynamic lithium battery;
According to described discharge and recharge historical data, generate power lithium battery tankage and the relation curve of time;
According to described relation curve, determine the power lithium battery tankage corresponding to each time-sampling point;
A dynamic lithium battery initial capacity and a dynamic lithium battery current capacities is obtained in the power lithium battery tankage corresponding to described each time-sampling point;
According to described initial capacity and described current capacities, determine the capacity attenuation rate of described dynamic lithium battery.
Concrete, described according to described initial capacity and described current capacities, determine the capacity attenuation rate of described dynamic lithium battery, comprising:
The capacity attenuation rate P of described dynamic lithium battery is determined according to formula one:
Wherein, C
1for described initial capacity, C
2for described current capacities.
In addition, described each time-sampling point be one pre-set annual in a day of the middle of each month pre-set for one day or one.
A pick-up unit for dynamic lithium battery capacity attenuation, comprising:
Discharge and recharge historical data acquiring unit, for obtaining the discharge and recharge historical data of dynamic lithium battery;
Relation curve generation unit, for according to described discharge and recharge historical data, generates power lithium battery tankage and the relation curve of time;
Dynamic lithium battery battery capacity acquiring unit, for according to described relation curve, determine the power lithium battery tankage corresponding to each time-sampling point, and obtain a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities in the power lithium battery tankage corresponding to described each time-sampling point;
Attenuation rate computing unit, for according to described initial capacity and described current capacities, determines the capacity attenuation rate of described dynamic lithium battery.
In addition, described attenuation rate computing unit specifically for:
The capacity attenuation rate P of described dynamic lithium battery is determined according to formula one:
Wherein, C
1for described initial capacity, C
2for described current capacities.
In addition, each time-sampling point in described dynamic lithium battery battery capacity acquiring unit be one pre-set annual in a day of the middle of each month pre-set for one day or one.
The detection method of the dynamic lithium battery capacity attenuation that the embodiment of the present invention provides and device, can according to the discharge and recharge historical data of dynamic lithium battery, generate power lithium battery tankage and the relation curve of time, and determine the power lithium battery tankage corresponding to each time-sampling point; By obtaining a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities, thus the capacity attenuation rate of dynamic lithium battery can be determined.The embodiment of the present invention detects dynamic lithium battery without the need to the pick-up unit by specialty, process is comparatively easy, and without the need to dynamic lithium battery is removed, avoid in prior art and detect dynamic lithium battery capacity attenuation situation and need special instrument, process very complicated, and the problem affecting that electric automobile normally runs.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The process flow diagram of the detection method of the dynamic lithium battery capacity attenuation that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is power lithium battery tankage in the embodiment of the present invention and the relation curve schematic diagram of time;
The structural representation of the pick-up unit of the dynamic lithium battery capacity attenuation that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the detection method of the dynamic lithium battery capacity attenuation that the embodiment of the present invention provides, comprising:
The discharge and recharge historical data of step 101, acquisition dynamic lithium battery.
Step 102, according to described discharge and recharge historical data, generate power lithium battery tankage and the relation curve of time.
Step 103, according to described relation curve, determine the power lithium battery tankage corresponding to each time-sampling point.
Step 104, in the power lithium battery tankage corresponding to described each time-sampling point, obtain a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities.
Step 105, according to described initial capacity and described current capacities, determine the capacity attenuation rate of described dynamic lithium battery.
The detection method of the dynamic lithium battery capacity attenuation that the embodiment of the present invention provides, according to the discharge and recharge historical data of dynamic lithium battery, can generate power lithium battery tankage and the relation curve of time, and determines the power lithium battery tankage corresponding to each time-sampling point; By obtaining a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities, thus the capacity attenuation rate of dynamic lithium battery can be determined.The embodiment of the present invention detects dynamic lithium battery without the need to the pick-up unit by specialty, process is comparatively easy, and without the need to dynamic lithium battery is removed, avoid in prior art and detect dynamic lithium battery capacity attenuation situation and need special instrument, process very complicated, and the problem affecting that electric automobile normally runs.
Above-mentioned discharge and recharge historical data comprises charging and discharging currents, charging/discharging voltage etc.In order to avoid the discharge and recharge historical data amount of dynamic lithium battery is comparatively large, the discharge and recharge historical data in the stage of dispatching from the factory of dynamic lithium battery, the discharge and recharge historical data in interstage (a certain section or several sections of historical datas of namely dispatching from the factory between stage and current time) and the discharge and recharge historical data of current generation (the discharge and recharge historical data namely in distance current time one Preset Time) only can be recorded.The stage of dispatching from the factory, the power lithium battery tankage of interstage and current generation and the relation curve of time can be generated so respectively.
The relation curve of power lithium battery tankage and time can as shown in Figure 2, and wherein, the horizontal ordinate in the coordinate system of Fig. 2 is time (this time can in units of the date), and ordinate is power lithium battery tankage.The power lithium battery tankage corresponding to each time-sampling point can be determined by this power lithium battery tankage and the relation curve of time.And each time-sampling point be one pre-set annual in a day of the middle of each month pre-set for one day or one, such as time-sampling point is respectively on March 1st, 2012, on March 1st, 2013, on March 1st, 2014 and on March 1st, 2015.Or such as time-sampling point can be on May 1st, 2014, on June 1st, 2014 and on July 1st, 2014 again, but is not only confined to this.What deserves to be explained is, the time interval of described time-sampling point can be identical, also can be different.
Capacity when this dynamic lithium battery initial capacity can be dispatching from the factory of dynamic lithium battery; Above-mentioned according to initial capacity and described current capacities, determine that the capacity attenuation rate of dynamic lithium battery can realize in the following way:
The capacity attenuation rate P of described dynamic lithium battery is determined according to formula one:
Wherein, C
1for described initial capacity, C
2for described current capacities.
Such as, initial capacity is 20Ah, and current capacities is 15Ah, then P is 25%, and the capacity attenuation rate of this dynamic lithium battery is 25%.
Corresponding to the detection method of the dynamic lithium battery capacity attenuation shown in above-mentioned Fig. 1, as shown in Figure 3, the embodiment of the present invention also provides a kind of pick-up unit of dynamic lithium battery capacity attenuation, comprising:
Discharge and recharge historical data acquiring unit 21, can obtain the discharge and recharge historical data of dynamic lithium battery.
Relation curve generation unit 22, according to described discharge and recharge historical data, can generate power lithium battery tankage and the relation curve of time.
Dynamic lithium battery battery capacity acquiring unit 23, can according to described relation curve, determine the power lithium battery tankage corresponding to each time-sampling point, and obtain a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities in the power lithium battery tankage corresponding to described each time-sampling point.
Attenuation rate computing unit 24, according to described initial capacity and described current capacities, can determine the capacity attenuation rate of described dynamic lithium battery.
In addition, this attenuation rate computing unit 24, the capacity attenuation rate P of described dynamic lithium battery specifically can be determined according to formula one:
Wherein, C
1for described initial capacity, C
2for described current capacities.
In addition, each time-sampling point in this dynamic lithium battery battery capacity acquiring unit 23 be one pre-set annual in a day of the middle of each month pre-set for one day or one.
What deserves to be explained is, the specific implementation of the pick-up unit of the dynamic lithium battery capacity attenuation that the embodiment of the present invention provides see the embodiment of the method for above-mentioned Fig. 1, can repeat no more herein.
The pick-up unit of the dynamic lithium battery capacity attenuation that the embodiment of the present invention provides, according to the discharge and recharge historical data of dynamic lithium battery, can generate power lithium battery tankage and the relation curve of time, and determines the power lithium battery tankage corresponding to each time-sampling point; By obtaining a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities, thus the capacity attenuation rate of dynamic lithium battery can be determined.The embodiment of the present invention detects dynamic lithium battery without the need to the pick-up unit by specialty, process is comparatively easy, and without the need to dynamic lithium battery is removed, avoid in prior art and detect dynamic lithium battery capacity attenuation situation and need special instrument, process very complicated, and the problem affecting that electric automobile normally runs.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the process flow diagram of the method for the embodiment of the present invention, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. a detection method for dynamic lithium battery capacity attenuation, is characterized in that, comprising:
Obtain the discharge and recharge historical data of dynamic lithium battery;
According to described discharge and recharge historical data, generate power lithium battery tankage and the relation curve of time;
According to described relation curve, determine the power lithium battery tankage corresponding to each time-sampling point;
A dynamic lithium battery initial capacity and a dynamic lithium battery current capacities is obtained in the power lithium battery tankage corresponding to described each time-sampling point;
According to described initial capacity and described current capacities, determine the capacity attenuation rate of described dynamic lithium battery.
2. the detection method of dynamic lithium battery capacity attenuation according to claim 1, is characterized in that, described according to described initial capacity and described current capacities, determines the capacity attenuation rate of described dynamic lithium battery, comprising:
The capacity attenuation rate P of described dynamic lithium battery is determined according to formula one:
Wherein, C
1for described initial capacity, C
2for described current capacities.
3. the detection method of the dynamic lithium battery capacity attenuation according to any one of claim 1 to 2, is characterized in that, described each time-sampling point be one pre-set annual in a day of the middle of each month pre-set for one day or one.
4. a pick-up unit for dynamic lithium battery capacity attenuation, is characterized in that, comprising:
Discharge and recharge historical data acquiring unit, for obtaining the discharge and recharge historical data of dynamic lithium battery;
Relation curve generation unit, for according to described discharge and recharge historical data, generates power lithium battery tankage and the relation curve of time;
Dynamic lithium battery battery capacity acquiring unit, for according to described relation curve, determine the power lithium battery tankage corresponding to each time-sampling point, and obtain a dynamic lithium battery initial capacity and a dynamic lithium battery current capacities in the power lithium battery tankage corresponding to described each time-sampling point;
Attenuation rate computing unit, for according to described initial capacity and described current capacities, determines the capacity attenuation rate of described dynamic lithium battery.
5. the pick-up unit of dynamic lithium battery capacity attenuation according to claim 4, is characterized in that, described attenuation rate computing unit, specifically for:
The capacity attenuation rate P of described dynamic lithium battery is determined according to formula one:
Wherein, C
1for described initial capacity, C
2for described current capacities.
6. the pick-up unit of the dynamic lithium battery capacity attenuation according to any one of claim 4 to 5, it is characterized in that, each time-sampling point in described dynamic lithium battery battery capacity acquiring unit be one pre-set annual in a day of the middle of each month pre-set for one day or one.
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Application publication date: 20150603 |