CN105259415A  Calculation method of internal resistance of battery  Google Patents
Calculation method of internal resistance of battery Download PDFInfo
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 CN105259415A CN105259415A CN201510717136.9A CN201510717136A CN105259415A CN 105259415 A CN105259415 A CN 105259415A CN 201510717136 A CN201510717136 A CN 201510717136A CN 105259415 A CN105259415 A CN 105259415A
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Abstract
A calculation method of internal resistance of a battery includes the following steps: in a first stage, judging whether the discharge of the battery reaches a constant current discharging state, obtaining a current from the discharge of the constant current; entering a second stage if the discharge of the battery is judged to reach the constant current discharging state; in the second stage, after the constant current discharging state lasts for a presetting discharging time, judging whether the discharge of the battery is cut off, and obtaining a cutoff voltage; entering a third stage if the battery is judged to reach a cutoff discharging state; in the third stage, judging whether the cutoff discharging state of the battery lasts for the presetting discharging time, obtaining a steady state voltage; and calculating the internal resistance of the battery according to the steady state voltage, the cutoff voltage and the current from the discharge of the constant current.
Description
Technical field
The present invention relates to a kind of battery technology, particularly a kind of internal resistance of cell computing method.
Background technology
For can accurately control battery, need the electricity reasonably estimating battery, and one of principal element of estimating battery electricity, be the internal resistance of battery.The abovementioned internal resistance of cell can become one of principal element of estimating battery electricity, is because the internal resistance of cell can improve along with cell degradation, therefore, cannot be simple with internal resistance of cell during battery production, carry out estimating battery electricity, the error estimated to avoid electricity.
As can be seen here, obviously still there is inconvenience and defect in existing mode, and haves much room for improvement.In order to solve the problem, association area there's no one who doesn't or isn't seeks solution painstakingly, but does not develop suitable solution yet for a long time.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of internal resistance of cell computing method, to improve the problems referred to above of prior art.
To achieve these goals, the invention provides a kind of internal resistance of cell computing method, the method comprises following steps: judge whether the electric discharge of battery reaches constantcurrent discharge state in the first stage, to obtain the electric current of constantcurrent discharge; If the electric discharge of battery reaches constantcurrent discharge state, then, after subordinate phase continues constantcurrent discharge to default discharge time, judge whether the electric discharge of battery ends, to obtain the cutoff voltage of battery; If the electric discharge of battery ends, then enter the phase III, after default time of repose, judge whether the voltage of battery returns to steady state voltage; And according to the electric current of steady state voltage, cutoff voltage and constantcurrent discharge to calculate the internal resistance of cell of battery.
Technique effect of the present invention is:
The present invention, by providing a kind of internal resistance of cell computing method, goes out the internal resistance of cell with instant computing and carrys out estimating battery electricity, the error estimated to avoid electricity.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of a kind of internal resistance of cell computing method according to an embodiment of the present invention;
Fig. 2 is the detailed step schematic diagram of a kind of internal resistance of cell computing method as shown in Figure 1 according to another embodiment of the present invention;
Fig. 3 is the detailed step schematic diagram of a kind of internal resistance of cell computing method as shown in Figure 1 according to yet another embodiment of the invention;
Fig. 4 is the detailed step schematic diagram of a kind of internal resistance of cell computing method as shown in Figure 1 according to further embodiment of this invention.
Wherein, Reference numeral
1000: method
1100,1200,1300,1400: step
1110 ~ 1160: step
1210 ~ 1260: step
1310 ~ 1350: step
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and principle of work are described in detail:
In order to make describing of summary of the invention more detailed and complete, hereafter have been directed to form of implementation of the present invention and specific embodiment proposes illustrative description; But this not implements or uses the unique forms of the specific embodiment of the invention.Cover in embodiment multiple specific embodiment feature and in order to construction and these specific embodiments of operation method step with its sequentially.But, other specific embodiments also can be utilized to reach identical or impartial function and sequence of steps.
Unless this instructions separately has definition, the implication of science and technology vocabulary used herein and the technical field of the invention technician understand with usual meaning identical.According to usual operating type, in accompanying drawing, various feature and element are not drawn to scale, and its drafting mode is to present specific features related to the present invention and element in optimal manner.In addition, between different figure, similar elements/components is censured with same or analogous component symbol.
For understanding technical characteristic of the present invention, introduce the situation of the battery that the present invention detects in advance.This battery is under the situation that discharge current is different, although discharge cutoff voltage is identical, but the actual depth of discharge to battery is different.The origin cause of formation of abovementioned condition is because the internal resistance of cell causes battery pressure drop, and this battery pressure drop can become large along with discharge current and increase.After battery discharge ends and leaves standstill a period of time, battery slowly can get back to opencircuit voltage, and the opencircuit voltage that battery is replied can be different with the difference of discharge current, and for example, if discharge current is larger, then the opencircuit voltage that battery is replied can be higher.
In order to avoid different load currents, affect the discharge capacity of every primary cell, and then affect the precision of battery electric quantity estimation.When battery discharge, internal resistance compensate function can be added, allow battery maintain the depth of discharge fixed.Abovementioned internal resistance compensate function is when cell voltage reaches discharge cutoff voltage, current battery voltage is added the pressure drop that internal resistance causes, and estimates the rational opencircuit voltage values of current battery.Once the opencircuit voltage values estimated reaches discharge cutoff voltage, just stop battery discharge.
If battery management system is for realizing abovementioned internal resistance compensate function, battery management system must have a set of mechanism, under the situation in battery uses, immediately calculates and upgrades internal resistance of cell value.In sum, carry out estimating battery electricity, the error estimated to avoid electricity for instant computing goes out the internal resistance of cell, the present invention proposes a kind of internal resistance of cell computing method, illustrate as after.
Fig. 1 is the process flow diagram of a kind of internal resistance of cell computing method according to an embodiment of the present invention.As shown in the figure, internal resistance of cell computing method 1000 comprise following steps:
Step 1100: judge whether the electric discharge of battery reaches constantcurrent discharge state in the first stage; Step 1200: if the electric discharge of battery reaches constantcurrent discharge state, then, after subordinate phase continues constantcurrent discharge to default discharge time, judge whether the electric discharge of battery ends, to obtain the cutoff voltage of battery; Step 1300: if the electric discharge of battery ends, then enter the phase III, after default time of repose, judges whether the voltage of battery returns to steady state voltage; And step 1400: if the voltage of battery returns to steady state voltage, then in fourth stage according to the electric current of steady state voltage, cutoff voltage and constantcurrent discharge to calculate the internal resistance of cell of battery.
Refer to step 1100, this step with being intended to judge whether battery is in constantcurrent discharge state, if the discharge current of battery is too little, internal resistance of cell computing method 1000 will be caused effectively to calculate, and cause the error of calculation.Therefore, during the first stage, detect discharge current and the cell voltage of battery, and judge whether the current discharge current (Cp) of battery is greater than predetermined current (Cm).In one embodiment, the current value of this predetermined current (Cm) can be but is not limited to 20A (ampere).Can judge whether battery is in constantcurrent discharge state (describing in detail after a while), if then continue subsequent step, to enter followup phase further when current discharge current (Cp) is greater than predetermined current (Cm); If discharge current (Cp) is less than predetermined current (Cm) at present, represents that battery is nonand be in constantcurrent discharge state, can not followup phase be entered.
Refer to step 1200, once judge that the electric discharge of battery is in constantcurrent discharge state, then enter subordinate phase, to judge whether the electric discharge of battery ends, if battery discharge ends, enter the phase III (step 1300), if battery discharge not yet ends, get back to the first stage (step 1100).This step with being intended to the cutoff voltage finding out battery, in order to the calculation procedure of further battery internal resistance.In one embodiment, specifically, if the residual electricity of the current discharge current (Cp) of abovementioned battery and battery is all zero, then represent that battery has discharged cutoff, voltage is now called the cutoff voltage of battery.Socalled residual electricity means the electricity of remaining battery, its can 0 ~ 100% mode represent current remaining electricity.Once the residual electricity of battery is zero, then represent battery and exhausted its electric energy stored, in other words, battery has discharged cutoff.
In another embodiment, please continue to refer to step 1200.Continue in the process of constantcurrent discharge in subordinate phase, if the curent change of constantcurrent discharge is greater than preset difference value, in other words, if the situation of battery discharge has not met the condition of constantcurrent discharge, whether and now battery discharge current is nonis zero, then getting back to the first stage reaches constantcurrent discharge state with the electric discharge rejudging battery.
Refer to step 1300, once judge battery discharge cutoff, then, in the phase III, battery, after standing Preset Time, judges whether the voltage of battery returns to steady state voltage.This step with being intended to the steady state voltage finding out battery, in order to the calculation procedure of further battery internal resistance.In one embodiment, abovementioned standing Preset Time can be but is not limited to 30 minutes, and when battery standing is after 30 minutes, the voltage returns of battery is to steadystate conditions, and voltage is now called steady state voltage.If after standing Preset Time, the voltage resume of battery then enters fourth stage (step 1400) to steady state voltage, if the voltage of battery does not return to steady state voltage, get back to the first stage (step 1100), whether the electric discharge rejudging battery is constantcurrent discharge.
Refer to step 1400, once judge that the voltage resume of battery is to steady state voltage, then in fourth stage, according to the electric current of steady state voltage, cutoff voltage and constantcurrent discharge to calculate the internal resistance of cell of battery.
Thus, by each step of abovementioned internal resistance of cell computing method 1000, the electric current of constantcurrent discharge, cutoff voltage and steady state voltage can be obtained respectively, therefore, internal resistance of cell computing method 1000 be really able to instant according to abovementioned parameter to calculate the internal resistance of cell of battery, and reasonable estimation battery electric quantity, the error estimated to avoid electricity.
Refer to the step 1400 of Fig. 1, in this embodiment, step 1400 also comprises following steps: steady state voltage is deducted cutoff voltage to obtain voltage difference; And by voltage difference divided by the electric current of constantcurrent discharge to obtain the internal resistance of cell.Then accurately the internal resistance of cell can be calculated according to abovementioned steps.For making abovementioned steps easy to understand, arranged as following formula, right the present invention is not as limit:
It should be noted that, each step 1100 ~ 1400 of internal resistance of cell computing method 1000 can be performed by hardware or software.For example, the mechanism of the judgement of step 1100 ~ 1300 can be performed by central processing unit, suitable electronic component or software, and the step of the calculating internal resistance of cell of step 1400 also can be performed by central processing unit, suitable electronic component or software.In addition, described in step 1100 ~ 1400 first stage ~ fourth stage, only with so that each practice condition of explaination internal resistance of cell computing method 1000, and be beneficial to understanding, it is not intended to limiting the invention.Hereinafter by describe in detail respectively first stage ~ each practice condition of fourth stage.
Fig. 2 is the detailed step schematic diagram of the first stage according to embodiment of the present invention internal resistance of cell computing method as shown in Figure 1.First, in step 1110, detect discharge current and the cell voltage of battery, to obtain current discharge current (Cp) and uptodate cell voltage.Then, in step 1120, judge whether the current discharge current (Cp) of battery is greater than predetermined current (Cm).Subsequently, if judge, the current discharge current (Cp) of battery is greater than predetermined current, performs step 1130 further, to judge whether the curent change of current discharge current (Cp) is greater than preset difference value.If judge, the curent change of current discharge current (Cp) is not more than preset difference value, then subsequent steps 1140.In one embodiment, abovementioned curent change is calculate the difference (CpCd) between current discharge current (Cp) and original discharge current (Cd), and abovementioned preset difference value can be but is not limited to 2A (ampere).
In one embodiment, in time performing abovementioned steps 1140, except upgrading the current discharge current (Cp) of battery for except original discharge current (Cd), the discharge current that also simultaneously can calculate battery is greater than the continuous discharging time of predetermined current.Then, in step 1150, judge whether continuous discharging time is greater than default discharge time.Subsequently, if judge, continuous discharging time is greater than default discharge time, then enter the subordinate phase shown in step 1200, to judge whether the battery of continuous discharge ends electric discharge.It should be noted that, abovementioned steps with being intended to, guarantee that battery is in constantcurrent discharge state, and this state continues for some time, to avoid the generation of the error of calculation further.In one embodiment, can be but be not limited to 150 seconds abovementioned default discharge time.
If the curent change that current discharge current (Cp) is not more than predetermined current, step 1130 determines current discharge current (Cp) that step 1120 determines battery is greater than preset difference value or step 1150 and determines continuous discharging time and be not more than default discharge time, then perform step 1160, current discharge current (Cp) is set as original discharge current (Cd), and continuous discharging time is set as zero, in other words, by parameter reset, then get back to step 1110, reexecute the detecting step of the discharge current of battery.
Fig. 3 is the detailed step schematic diagram of the subordinate phase according to embodiment of the present invention internal resistance of cell computing method as shown in Figure 1.First, in step 1210, continue the discharge current and the cell voltage that detect battery, to obtain current discharge current (Cp) and uptodate cell voltage.Then, in step 1220, judge whether the curent change of current discharge current (Cp) is greater than preset difference value.Abovementioned curent change is calculate the difference (CpCd) between current discharge current (Cp) and original discharge current (Cd).In one embodiment, abovementioned preset difference value can be but is not limited to 2A (ampere).Subsequently, if judge, the curent change of current discharge current (Cp) is greater than preset difference value, then perform step 1250, to judge that whether the cutoff voltage of current discharge current (Cp) and cell voltage is for zero, if judge the cutoff voltage of current discharge current (Cp) and cell voltage as zero time, then enter the phase III 1300, to judge whether the voltage of battery returns to steady state voltage.
In another embodiment, refer to step 1220, if judge, the curent change of current discharge current (Cp) is not more than preset difference value, then, as shown in step 1230, upgrade current discharge current (Cp) for original discharge current (Cd).In execution step 1230 with after upgrading original discharge current (Cd), then execution step 1240, to judge whether original discharge current (Cd) is greater than predetermined current.If judge, original discharge current is greater than predetermined current, then later perform step 1210, with the discharge current of lasting detection battery, represents that battery discharge not yet ends, and still in lasting constantcurrent discharge.In one embodiment, abovementioned predetermined current can be but is not limited to 20A (ampere).
In another embodiment, if step 1240 determine original discharge current (Cd) be not more than predetermined current or step 1250 determine the cutoff voltage of current discharge current (Cp) and cell voltage nonvanishing time, then perform step 1260, current discharge current (Cp) is set as original discharge current (Cd), and continuous discharging time is set as zero, in other words, by parameter reset, then get back to the first stage of step 1100, whether be greater than the steps such as predetermined current to reexecute the discharge current judging battery.
Fig. 4 is the detailed step schematic diagram of the phase III according to embodiment of the present invention internal resistance of cell computing method as shown in Figure 1.First, in step 1310, continue the discharge current and the cell voltage that detect battery, to obtain current discharge current (Cp) and uptodate cell voltage.Then, in step 1320, judge whether current discharge current (Cp) is zero.Subsequently, if judge, current discharge current (Cp) is as zero, then, as shown in step 1330, upgrading discharge current is the duration of zero.Then, in step 1340, judge discharge current be zero duration whether be greater than default time of repose.If judge discharge current as zero duration be greater than default time of repose, represent battery complete standing, when completing standing, measured cell voltage is steady state voltage, then enters the fourth stage shown in step 1400, to calculate the internal resistance of cell of battery.In one embodiment, abovementioned Preset Time can be but is not limited to 30 minutes.
In another embodiment, refer to step 1340, if judge discharge current as zero duration be not more than default time of repose, then get back to step 1310, again detect discharge current and the cell voltage of battery.
In another embodiment, if step 1320 determines current discharge current, (Cp) is nonvanishing, then perform step 1350, current discharge current (Cp) is set as original discharge current (Cd), continuous discharging time is set as zero, and default time of repose is set as zero, in other words, by parameter reset, then the first stage of step 1100 is got back to, to reexecute the detecting step of the discharge current of battery.
Those skilled in the art are when understanding, the function that each step in internal resistance of cell computing method 1000 performs according to it is named, and only in order to allow technology of the present invention more become apparent, and is not used to limit these steps.Each step be integrated into same step or be split into multiple step, or arbitrary step is changed in another step performing, all still being belonged to the embodiment of content of the present invention.
From the invention described above embodiment, application the present invention has following advantages.The embodiment of the present invention, by providing a kind of internal resistance of cell computing method, goes out the internal resistance of cell with instant computing and carrys out estimating battery electricity, the problem of the error estimated to avoid electricity.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (13)
1. an internal resistance of cell computing method, is characterized in that, comprise:
In a first stage, judge whether the electric discharge of a battery reaches a constantcurrent discharge state, to obtain the electric current of a constantcurrent discharge;
If judge, the electric discharge of this battery reaches this constantcurrent discharge state, then enter a subordinate phase;
In this subordinate phase, this constantcurrent discharge state judges whether the electric discharge of this battery ends, to obtain a cutoff voltage after continuing to a default discharge time;
If judge, this battery reaches cutoff discharge condition, then enter a phase III;
In this phase III, judge whether this cutoff discharge condition of this battery continues one and preset time of repose, to obtain a steady state voltage; And
According to the electric current of this steady state voltage, this cutoff voltage and this constantcurrent discharge to calculate an internal resistance of cell of this battery.
2. internal resistance of cell computing method as claimed in claim 1, is characterized in that, also comprise:
In this subordinate phase, if the curent change of this constantcurrent discharge be greater than a preset difference value and the discharge current of this constantcurrent discharge nonbe zero, then whether get back to this first stage reaches this constantcurrent discharge state with the electric discharge rejudging this battery.
3. internal resistance of cell computing method as claimed in claim 1, is characterized in that, comprise according to this steady state voltage, this cutoff voltage and this discharge current with the step of this internal resistance of cell calculating this battery:
This steady state voltage is deducted this cutoff voltage to obtain a voltage difference; And
By this voltage difference divided by this discharge current to obtain this internal resistance of cell.
4. internal resistance of cell computing method as claimed in claim 1, is characterized in that, judge that the step whether electric discharge of battery reaches constantcurrent discharge state comprises in this first stage:
Detect this discharge current of this battery, to obtain a current discharge current;
Judge whether this current discharge current is greater than a predetermined current;
If judge, this current discharge current is greater than this predetermined current, then judge whether the curent change of this current discharge current is greater than a preset difference value; And
If judge, the curent change of this current discharge current is not more than this preset difference value, then upgrading this current discharge current is an original discharge current.
5. internal resistance of cell computing method as claimed in claim 4, is characterized in that, the curent change of this current discharge current is calculate the difference between this current discharge current and original discharge current for previous time point.
6. internal resistance of cell computing method as claimed in claim 4, is characterized in that, judge that the step whether electric discharge of this battery reaches this constantcurrent discharge state also comprises in this first stage:
This discharge current calculating this battery is greater than a continuous discharging time of this predetermined current;
Judge whether this continuous discharging time is greater than one and presets discharge time; And
If judge, this continuous discharging time is greater than this default discharge time, then enter this subordinate phase to judge whether the electric discharge of this battery ends, to obtain this cutoff voltage.
7. internal resistance of cell computing method as claimed in claim 6, is characterized in that, also comprise:
If judge, this current discharge current is not more than this predetermined current, judges that the curent change of this current discharge current is greater than this preset difference value or judges that this continuous discharging time is not more than this default discharge time, then this current discharge current be set as an original discharge current and this continuous discharging time is set as zero, and reexecuting the step of this discharge current of this this battery of detection.
8. internal resistance of cell computing method as claimed in claim 1, is characterized in that, after this constantcurrent discharge state of this subordinate phase continues to this default discharge time, judge whether the electric discharge of this battery ends, and comprises with the step obtaining this cutoff voltage:
Detect this discharge current and a cell voltage of this battery, to obtain current discharge current and a cell voltage;
Judge whether the curent change of this current discharge current is greater than a preset difference value;
If judge, the curent change of this current discharge current is greater than this preset difference value, then judge whether the cutoff voltage of this current discharge current and this cell voltage is zero; And
If judge, the cutoff voltage of this current discharge current and this cell voltage is as zero, then enter this phase III to judge whether the voltage of battery returns to this steady state voltage.
9. internal resistance of cell computing method as claimed in claim 8, is characterized in that, after this constantcurrent discharge state of this subordinate phase continues to this default discharge time, judge whether the electric discharge of this battery ends, and also comprises with the step obtaining this cutoff voltage:
If judge, the curent change of this current discharge current is not more than this preset difference value, then upgrading this current discharge current is an original discharge current;
Judge whether this original discharge current is greater than a predetermined current; And
If judge, this original discharge current is greater than this predetermined current, then reexecute and detect this discharge current of this battery and the step of this cell voltage.
10. internal resistance of cell computing method as claimed in claim 9, is characterized in that, after this constantcurrent discharge state of this subordinate phase continues to this default discharge time, judge whether the electric discharge of this battery ends, and also comprises with the step obtaining this cutoff voltage:
If judge, nonvanishing or this original discharge current of the cutoff voltage of this current discharge current and this cell voltage is not more than this predetermined current, then this current discharge current be set as this original discharge current and a continuous discharging time is set as zero, and getting back to this first stage and whether reach this constantcurrent discharge state with the electric discharge rejudging this battery.
11. internal resistance of cell computing method as claimed in claim 1, is characterized in that, judge whether this cutoff discharge condition of this battery continues this default time of repose and comprise with the step obtaining this steady state voltage in this phase III:
Detect this discharge current of this battery, to obtain a current discharge current;
Judge whether this current discharge current is zero;
If judge, this current discharge current is as zero, then upgrade the duration that this discharge current is zero;
Judge this discharge current be zero this duration whether be greater than this default time of repose; And
If judge this discharge current as zero this duration be greater than this default time of repose, then enter this fourth stage to calculate this internal resistance of cell of this battery.
12. internal resistance of cell computing method as claimed in claim 11, is characterized in that, judge whether this cutoff discharge condition of this battery continues this default time of repose and also comprise with the step obtaining this steady state voltage in this phase III:
If judge this discharge current as zero this duration be not more than this default time of repose, then reexecute the step of this discharge current of this this battery of detection.
13. internal resistance of cell computing method as claimed in claim 12, is characterized in that, judge whether this cutoff discharge condition of this battery continues this default time of repose and also comprise with the step obtaining this steady state voltage in this phase III:
If judge, this current discharge current is nonvanishing, then this current discharge current is set as an original discharge current, a continuous discharging time is set as zero and this default time of repose is set as zero, and get back to this first stage and whether reach this constantcurrent discharge state with the electric discharge rejudging this battery.
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