CN105259415B  Internal resistance of cell computational methods  Google Patents
Internal resistance of cell computational methods Download PDFInfo
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 CN105259415B CN105259415B CN201510717136.9A CN201510717136A CN105259415B CN 105259415 B CN105259415 B CN 105259415B CN 201510717136 A CN201510717136 A CN 201510717136A CN 105259415 B CN105259415 B CN 105259415B
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Abstract
A kind of internal resistance of cell computational methods, it is comprised the steps of：In the first stage, judge whether the electric discharge of battery reaches a constantcurrent discharge state, to obtain the electric current of constantcurrent discharge；If it is determined that the electric discharge of battery reaches constantcurrent discharge state, then into second stage；In second stage, constantcurrent discharge state continued to default discharge time, judged whether the electric discharge of battery ends, to obtain blanking voltage；If it is determined that battery reaches cutoff discharge condition, then into the phase III；In the phase III, judge whether the cutoff discharge condition of battery persistently presets time of repose, to obtain steady state voltage；And according to steady state voltage, blanking voltage and the electric current of constantcurrent discharge to calculate the internal resistance of cell of battery.
Description
Technical field
The present invention relates to a kind of battery technology, particularly a kind of internal resistance of cell computational methods.
Background technology
For that accurately can be controlled to battery, it is necessary to reasonably estimate the electricity of battery, and estimate the master of battery electric quantity
One of factor is wanted, is the internal resistance of battery.The abovementioned internal resistance of cell can turn into one of principal element of estimation battery electric quantity, be due to
The internal resistance of cell can improve with cell degradation, therefore, it is impossible to it is simple with internal resistance of cell during battery production, to estimate battery
Electricity, to avoid the error that electricity is estimated.
As can be seen here, existing mode obviously still suffers from inconvenience and defect, and has much room for improvement.In order to solve the above problems,
Association area there's no one who doesn't or isn't painstakingly seeks solution, but does not develop appropriate solution yet for a long time.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of internal resistance of cell computational methods, to improve the upper of prior art
State problem.
To achieve these goals, the invention provides a kind of internal resistance of cell computational methods, the method to comprise the steps of：
Judge whether the electric discharge of battery reaches constantcurrent discharge state in the first stage, to obtain the electric current of constantcurrent discharge；If battery
Electric discharge reach constantcurrent discharge state, then in second stage continue constantcurrent discharge to default discharge time after, judge electricity
Whether the electric discharge in pond ends, to obtain the blanking voltage of battery；If the electric discharge of battery has ended, into the phase III, pass through
After default time of repose, judge whether the voltage of battery recovers to steady state voltage；And according to steady state voltage, blanking voltage and determine
The electric current of current discharge is to calculate the internal resistance of cell of battery.
The technical effects of the invention are that：
The present invention goes out the internal resistance of cell to estimate battery electricity by providing a kind of internal resistance of cell computational methods with instant computing
Amount, to avoid the error that electricity is estimated.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Brief description of the drawings
Fig. 1 is a kind of flow chart of internal resistance of cell computational methods according to an embodiment of the present invention；
Fig. 2 is a kind of detailed step of internal resistance of cell computational methods as shown in Figure 1 according to another embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of detailed step of internal resistance of cell computational methods as shown in Figure 1 according to yet another embodiment of the invention
Schematic diagram；
Fig. 4 is a kind of detailed step of internal resistance of cell computational methods as shown in Figure 1 according to further embodiment of this invention
Schematic diagram.
Wherein, reference
1000：Method
1100、1200、1300、1400：Step
1110~1160：Step
1210~1260：Step
1310~1350：Step
Embodiment
The structural principle and operation principle of the present invention are described in detail below in conjunction with the accompanying drawings：
In order that the narration of the content of the invention is more detailed with complete, below for form of implementation and the specific reality of the present invention
Apply example and propose illustrative description；But this not implements or the unique forms with the specific embodiment of the invention.Embodiment
In cover multiple specific embodiments feature and to construction with operate these specific embodiments method and step it is suitable with it
Sequence.However, it can also reach identical or impartial function and sequence of steps using other specific embodiments.
Unless this specification is defined otherwise, the implication of science and technology vocabulary used herein is led with technology belonging to the present invention
Field technique personnel understand identical with usual meaning.According to usual operating type, in accompanying drawing various features with element not
Scale, its drafting mode are in order to which specific features and element related to the present invention are presented in optimal manner.In addition,
Between different figures, similar elements/components are censured with same or analogous component symbol.
To understand the technical characteristic of the present invention, the situation for the battery that the present invention is detected is introduced in advance.This battery is discharging
Under the different situation of electric current, although discharge cutoff voltage is identical, however, the actual depth of discharge to battery is different.Abovementioned condition
The origin cause of formation, be due to that the internal resistance of cell causes battery pressure drop, this battery pressure drop can become big with discharge current and increase.Work as battery
After electric discharge ends and stands a period of time, battery can slowly return to opencircuit voltage, and the opencircuit voltage that battery is replied can be with electric discharge electricity
The difference of stream and it is different, for example, if discharge current is bigger, then battery reply opencircuit voltage can be higher.
In order to avoid different load currents, the discharge capacity of every primary cell is influenceed, and then influences the essence of battery electric quantity estimation
Accuracy.In battery discharge, internal resistance compensation function can be added, allows battery to maintain fixed depth of discharge.Abovementioned internal resistance compensates work(
It can be when cell voltage reaches discharge cutoff voltage, current battery voltage is added into pressure drop caused by internal resistance, to estimate at present
The rational opencircuit voltage values of battery.Once the opencircuit voltage values estimated reach discharge cutoff voltage, just stop to battery discharge.
If battery management system is intended to realize abovementioned internal resistance compensation function, battery management system must have a set of mechanism, in electricity
Under situation in the use of pond, immediately calculate and renewal internal resistance of cell value.In summary, the internal resistance of cell is gone out for instant computing to estimate
Battery electric quantity is calculated, to avoid the error that electricity is estimated, the present invention proposes a kind of internal resistance of cell computational methods, illustrates as after.
Fig. 1 is a kind of flow chart of internal resistance of cell computational methods according to an embodiment of the present invention.As illustrated, battery
Internal resistance computational methods 1000 comprise the steps of：
Step 1100：Judge whether the electric discharge of battery reaches constantcurrent discharge state in the first stage；Step 1200：It is if electric
The electric discharge in pond reaches constantcurrent discharge state, then after second stage continues constantcurrent discharge to default discharge time, judges
Whether the electric discharge of battery ends, to obtain the blanking voltage of battery；Step 1300：If the electric discharge of battery has ended, into
In three stages, after default time of repose, judge whether the voltage of battery recovers to steady state voltage；And step 1400：It is if electric
The voltage in pond has recovered to steady state voltage, then in fourth stage according to steady state voltage, blanking voltage and the electric current of constantcurrent discharge
To calculate the internal resistance of cell of battery.
Step 1100 is referred to, this step is intended to judge whether battery is in constantcurrent discharge state, if battery
Discharge current it is too small, internal resistance of cell computational methods 1000 will be caused not calculated effectively, and cause calculation error.Cause
This, during the first stage, detects the discharge current and cell voltage of battery, and judge whether the current discharge current (Cp) of battery is big
In predetermined current (Cm).In one embodiment, the current value of this predetermined current (Cm) can be but be not limited to 20A (ampere).Work as mesh
Preceding discharge current (Cp), which is more than predetermined current (Cm), can determine whether battery is (detailed later in constantcurrent discharge state
State), if then continuing subsequent step, with into followup phase；If current discharge current (Cp) is less than predetermined current (Cm), represent
Battery is nonto be in constantcurrent discharge state, will not enter followup phase.
Step 1200 is referred to, once judge that the electric discharge of battery is in constantcurrent discharge state, then into second stage, with
Judge whether the electric discharge of battery ends, enter phase III (step 1300) if battery discharge ends, if battery discharge is not yet
Cutoff then returns to first stage (step 1100).The blanking voltage for being intended to find out battery of this step, with sharp further battery
The calculation procedure of internal resistance.In one embodiment, specifically, if the current discharge current (Cp) of abovementioned battery and the residual electricity of battery
Amount is all zero, then it represents that battery has discharged cutoff, and voltage now is referred to as the blanking voltage of battery.Socalled residual electricity means battery
Remaining electricity, it can represent current remaining electricity in a manner of 0~100%.Once the residual electricity of battery is zero, then generation
Table battery has exhausted the electric energy of its storage, and in other words, battery has discharged cutoff.
In another embodiment, please continue to refer to step 1200.During second stage continues constantcurrent discharge, if
If the curent change of constantcurrent discharge is more than preset difference value, in other words, if the situation of battery discharge has not met and has determined electric current and put
The condition of electricity, and now battery discharge current is nonzero, then returns to the first stage to rejudge whether the electric discharge of battery reaches
Constantcurrent discharge state.
Step 1300 is referred to, once judging battery discharge cutoff, then in the phase III, battery is in standing preset time
Afterwards, judge whether the voltage of battery recovers to steady state voltage.The steady state voltage for being intended to find out battery of this step, after profit
The calculation procedure of the continuous internal resistance of cell.In one embodiment, abovementioned standing preset time can be but be not limited to 30 minutes, when battery is quiet
After putting 30 minutes, the voltage returns of battery are referred to as steady state voltage to steadystate conditions, voltage now.If in standing preset time
Afterwards, the voltage of battery recovers then to enter fourth stage (step 1400) to steady state voltage, if the voltage of battery does not recover to stable state
Voltage then returns to first stage (step 1100), and whether the electric discharge for rejudging battery is constantcurrent discharge.
Step 1400 is referred to, once judge that the voltage of battery recovers to steady state voltage, then in fourth stage, according to steady
State voltage, blanking voltage and the electric current of constantcurrent discharge are to calculate the internal resistance of cell of battery.
Consequently, it is possible to by each step of abovementioned internal resistance of cell computational methods 1000, constantcurrent discharge can be respectively obtained
Electric current, blanking voltage and steady state voltage, therefore, internal resistance of cell computational methods 1000 are able to immediately according to abovementioned parameter in terms of really
Calculate the internal resistance of cell of battery, and reasonable estimation battery electric quantity, to avoid the error that electricity is estimated.
Fig. 1 step 1400 is referred to, in this embodiment, step 1400 also comprises the steps of：Steady state voltage is subtracted
Blanking voltage is removed to obtain voltage difference；And by voltage difference divided by the electric current of constantcurrent discharge to obtain the internal resistance of cell.According to
The internal resistance of cell then can be accurately calculated according to abovementioned steps.To make abovementioned steps it can be readily appreciated that being arranged such as following formula, so originally
Invention is not limited thereto：
It should be noted that each step 1100~1400 of internal resistance of cell computational methods 1000 can be subject to by hardware or software
Perform.For example, the mechanism of the judgement of step 1100~1300 can by central processing unit, appropriate electronic component or software Lai
Perform, and the step of calculating internal resistance of cell of step 1400 can also be added by central processing unit, appropriate electronic component or software
To perform.In addition, first stage~fourth stage described in step 1100~1400, only with order to explaining internal resistance of cell meter
Each practice condition of calculation method 1000, and beneficial to understanding, it is not intended to limiting the invention.The first rank will be described in detail respectively hereinafter
Each practice condition of section~fourth stage.
Fig. 2 is the detailed step of the first stage of the internal resistance of cell computational methods as shown in Figure 1 according to the embodiment of the present invention
Schematic diagram.First, in step 1110, the discharge current and cell voltage of battery are detected, to obtain current discharge current (Cp)
With newest cell voltage.Then, in step 1120, judge whether the current discharge current (Cp) of battery is more than predetermined current
(Cm).Then, if it is determined that the current discharge current (Cp) of battery is more than predetermined current, step 1130 is further performed, to judge
Whether the curent change of discharge current (Cp) is more than preset difference value at present.If it is determined that 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 for calculate current discharge current (Cp) with
Difference (CpCd) between original discharge current (Cd), abovementioned preset difference value can be but be not limited to 2A (ampere).
In one embodiment, when abovementioned steps 1140 are performed, except the current discharge current (Cp) of renewal battery is original
Outside, the discharge current that can also calculate battery simultaneously is more than the continuous discharging time of predetermined current to discharge current (Cd).Then, Yu Bu
In rapid 1150, judge whether continuous discharging time is more than default discharge time.Then, if it is determined that continuous discharging time is more than default
Discharge time, then into the second stage shown in step 1200, to judge whether the battery of continuous discharge ends electric discharge.Need to illustrate
, abovementioned steps are intended, it is ensured that battery is in constantcurrent discharge state, and this state continues for some time, to enter
One step avoids the generation of calculation error.In one embodiment, abovementioned default discharge time can be but be not limited to 150 seconds.
If the current discharge current (Cp) that step 1120 determines battery determines no more than predetermined current, step 1130
The curent change of discharge current (Cp) is more than preset difference value at present or step 1150 determines continuous discharging time no more than default
Discharge time, then step 1160 is performed, current discharge current (Cp) is set as original discharge current (Cd), and by continuous discharge
Time is set as zero, in other words, by parameter reset, is then return to step 1110, reexecutes the detection of the discharge current of battery
Step.
Fig. 3 is the detailed step of the second stage of the internal resistance of cell computational methods as shown in Figure 1 according to the embodiment of the present invention
Schematic diagram.First, in step 1210, the discharge current and cell voltage of battery are persistently detected, to obtain current discharge current
(Cp) with newest cell voltage.Then, in step 1220, judge whether the curent change of current discharge current (Cp) is more than in advance
If difference.Difference (CpCd) of the abovementioned curent change between the current discharge current (Cp) of calculating and original discharge current (Cd).
In one embodiment, abovementioned preset difference value can be but be not limited to 2A (ampere).Then, if it is determined that the electricity of current discharge current (Cp)
Rheologyization is more than preset difference value, then step 1250 is performed, to judge the blanking voltage of current discharge current (Cp) and cell voltage
Whether it is zero, if it is determined that when the blanking voltage of discharge current (Cp) and cell voltage is zero at present, then into the phase III 1300,
To judge whether the voltage of battery recovers to steady state voltage.
In another embodiment, step 1220 is referred to, if it is determined that the curent change of discharge current (Cp) is not more than at present
Preset difference value, then as shown in step 1230, it is original discharge current (Cd) to update current discharge current (Cp).In execution step
After 1230 to update original discharge current (Cd), then step 1240 is performed, to judge it is pre whether original discharge current (Cd) is more than
If electric current.If it is determined that original discharge current is more than predetermined current, then step 1210 is later performed, with the electric discharge of lasting detection battery
Electric current, represent that battery discharge not yet ends, and still in lasting constantcurrent discharge.In one embodiment, abovementioned predetermined current can be
But it is not limited to 20A (ampere).
In another embodiment, if step 1240 determines original discharge current (Cd) and is not more than predetermined current or step
When 1250 blanking voltages for determining current discharge current (Cp) and cell voltage are not zero, then step 1260 is performed, will be current
Discharge current (Cp) is set as original discharge current (Cd), and continuous discharging time is set as into zero, in other words, by parameter weight
If being then return to the first stage of step 1100, judge whether the discharge current of battery is more than predetermined current etc. to reexecute
Step.
Fig. 4 is the detailed step of the phase III of the internal resistance of cell computational methods as shown in Figure 1 according to the embodiment of the present invention
Schematic diagram.First, in step 1310, the discharge current and cell voltage of battery are persistently detected, to obtain current discharge current
(Cp) with newest cell voltage.Then, in step 1320, judge whether current discharge current (Cp) is zero.Then, if it is determined that
Discharge current (Cp) is zero at present, then as shown in step 1330, updates the duration that discharge current is zero.Then, in step
In 1340, judge whether the duration that discharge current is zero is more than default time of repose.If it is determined that discharge current is zero to hold
The continuous time is more than default time of repose, represents that battery is completed to stand, and measured cell voltage is steady state voltage when completing to stand,
The fourth stage shown in step 1400 is subsequently entered, to calculate the internal resistance of cell of battery.In one embodiment, abovementioned preset time
It can be but be not limited to 30 minutes.
In another embodiment, step 1340 is referred to, if it is determined that the duration that discharge current is zero is no more than default
Time of repose, then step 1310 is returned to, detect the discharge current and cell voltage of battery again.
In another embodiment, if step 1320 determines current discharge current, (Cp) is not zero, then performs step
1350, current discharge current (Cp) is set as original discharge current (Cd), continuous discharging time is set as to zero, and will be default
Time of repose is set as zero, in other words, by parameter reset, the first stage of step 1100 is then return to, to reexecute battery
Discharge current detecting step.
Those skilled in the art are when it can be appreciated that each step in internal resistance of cell computational methods 1000 is given according to its function of performing
With name, only for making the technology of the present invention more obvious understandable, such step is not limited to.Each step is integrated
Into same step or multiple steps are split into, or either step is changed into another step and performed, all still fall within the present invention
The embodiment of content.
From the invention described above embodiment, there are following advantages using the present invention.The embodiment of the present invention passes through offer
A kind of internal resistance of cell computational methods, the internal resistance of cell is gone out with instant computing to estimate battery electric quantity, to avoid the error that electricity is estimated
The problem of.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Know those skilled in the art when can be made according to the present invention it is various it is corresponding change and deformation, but these corresponding change and become
Shape should all belong to the protection domain of appended claims of the invention.
Claims (10)
1. a kind of internal resistance of cell computational methods, it is characterised in that include：
In a first stage, judge whether the electric discharge of a battery reaches a constantcurrent discharge state, to obtain a constantcurrent discharge
Electric current；
If it is determined that the electric discharge of the battery reaches the constantcurrent discharge state, then into a second stage；
In the second stage, the constantcurrent discharge state continued to a default discharge time, and judging the electric discharge of the battery is
No cutoff, to obtain a blanking voltage；
If it is determined that the battery reaches cutoff discharge condition, then into a phase III；
In the phase III, judge whether the cutoff discharge condition of the battery continues a default time of repose, it is steady to obtain one
State voltage；
According to the electric current of the steady state voltage, the blanking voltage and the constantcurrent discharge to calculate an internal resistance of cell of the battery；
Wherein, judge that the step of whether electric discharge of battery reaches constantcurrent discharge state includes in the first stage：
The discharge current of the battery is detected, to obtain a current discharge current；
Judge whether the current discharge current is more than a predetermined current；
If it is determined that the current discharge current is more than the predetermined current, then judge whether the curent change of the current discharge current is more than
One preset difference value；
If it is determined that the curent change of the current discharge current is not more than the preset difference value, then it is former for one to update the current discharge current
Beginning discharge current；
The discharge current for calculating the battery is more than a continuous discharging time of the predetermined current；
Judge whether the continuous discharging time is more than a default discharge time；
If it is determined that the continuous discharging time is more than the default discharge time, then into the second stage to judge the electric discharge of the battery
Whether end, to obtain the blanking voltage；And
In the second stage, if the curent change of the constantcurrent discharge is more than a preset difference value and the electric discharge electricity of the constantcurrent discharge
Flow nonzero, then return to the first stage to rejudge whether the electric discharge of the battery reaches the constantcurrent discharge state.
2. internal resistance of cell computational methods as claimed in claim 1, it is characterised in that also include：
In the second stage, if the curent change of the constantcurrent discharge is more than a preset difference value and the electric discharge electricity of the constantcurrent discharge
Flow nonzero, then return to the first stage to rejudge whether the electric discharge of the battery reaches the constantcurrent discharge state.
3. internal resistance of cell computational methods as claimed in claim 1, it is characterised in that according to the steady state voltage, the blanking voltage
And the discharge current is included with calculating the step of the internal resistance of cell of the battery：
The steady state voltage is subtracted into the blanking voltage to obtain a voltage difference；And
By the voltage difference divided by the discharge current to obtain the internal resistance of cell.
4. internal resistance of cell computational methods as claimed in claim 1, it is characterised in that the curent change of the current discharge current is
Calculate the difference between an original discharge current of the current discharge current and previous time point.
5. internal resistance of cell computational methods as claimed in claim 1, it is characterised in that in the second stage constantcurrent discharge shape
State continues after presetting discharge time to this, judges whether the electric discharge of the battery ends, and is wrapped with obtaining the step of the blanking voltage
Contain：
Discharge current and a cell voltage of the battery are detected, to obtain a current discharge current and a cell voltage；
Judge whether the curent change of the current discharge current is more than a preset difference value；
If it is determined that the curent change of the current discharge current is more than the preset difference value, then the current discharge current and the battery are judged
Whether the blanking voltage of voltage is zero；And
If it is determined that the blanking voltage of the current discharge current and the cell voltage is zero, then into the phase III to judge battery
Voltage whether recover to the steady state voltage.
6. internal resistance of cell computational methods as claimed in claim 5, it is characterised in that in the second stage constantcurrent discharge shape
State continues after presetting discharge time to this, judges whether the electric discharge of the battery ends, the step of to obtain the blanking voltage also
Comprising：
If it is determined that the curent change of the current discharge current is not more than the preset difference value, then it is the original to update the current discharge current
Beginning discharge current；
Judge whether the original discharge current is more than a predetermined current；And
If it is determined that the original discharge current is more than the predetermined current, then the discharge current and the electricity for detecting the battery are reexecuted
The step of cell voltage.
7. internal resistance of cell computational methods as claimed in claim 6, it is characterised in that in the second stage constantcurrent discharge shape
State continues after presetting discharge time to this, judges whether the electric discharge of the battery ends, the step of to obtain the blanking voltage also
Comprising：
If it is determined that the blanking voltage of the current discharge current and the cell voltage is not zero or the original discharge current is no more than this
Predetermined current, then the current discharge current is set as the original discharge current and a continuous discharging time is set as zero, and
The first stage is returned to rejudge whether the electric discharge of the battery reaches the constantcurrent discharge state.
8. internal resistance of cell computational methods as claimed in claim 1, it is characterised in that being somebody's turn to do for the battery is judged in the phase III
Persistently whether the default time of repose is included cutoff discharge condition with obtaining the step of the steady state voltage：
The discharge current of the battery is detected, to obtain a current discharge current；
Judge whether the current discharge current is zero；
If it is determined that the current discharge current is zero, then the duration that the discharge current is zero is updated；
Judge whether the duration that the discharge current is zero is more than the default time of repose；And
If it is determined that the duration that the discharge current is zero is more than the default time of repose, then into the fourth stage to calculate
The internal resistance of cell of the battery.
9. internal resistance of cell computational methods as claimed in claim 8, it is characterised in that being somebody's turn to do for the battery is judged in the phase III
Persistently whether the default time of repose is also included cutoff discharge condition with obtaining the step of the steady state voltage：
If it is determined that the duration that the discharge current is zero no more than the default time of repose, then reexecutes the detection electricity
The step of discharge current in pond.
10. internal resistance of cell computational methods as claimed in claim 9, it is characterised in that judge the battery in the phase III
Persistently whether the default time of repose is also included the cutoff discharge condition with obtaining the step of the steady state voltage：
If it is determined that the current discharge current is not zero, then the current discharge current is set as the original discharge current, held one
Continuous discharge time is set as zero and this is preset into time of repose being set as zero, and returns to the first stage to rejudge the battery
Electric discharge whether reach the constantcurrent discharge state.
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