CN104749525A - Battery aging state detection device, system and method - Google Patents
Battery aging state detection device, system and method Download PDFInfo
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- CN104749525A CN104749525A CN201310752882.2A CN201310752882A CN104749525A CN 104749525 A CN104749525 A CN 104749525A CN 201310752882 A CN201310752882 A CN 201310752882A CN 104749525 A CN104749525 A CN 104749525A
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Abstract
The invention provides a battery aging state detection method, including the steps of: controlling a battery to charge or discharge; detecting the voltage value and the current value of the battery during charging or discharging; judging whether the battery is positioned in a certain phase change period of the battery material according to that whether the voltage value is positioned in a preset voltage range, wherein the preset voltage range is the corresponding voltage range when the battery material is positioned in the balance period of phase change, and the phase change period indicates the period where the battery material continuously exist with a phase; when the current value is integrated within the time period corresponding to the phase change period to achieve that the battery material is positioned in a certain phase change period, integrating the current value within the time period corresponding to the phase change period to obtain the capacitance of the battery within the time period corresponding to the phase change period, and computing the current battery electrical charge state function and the current battery health state function of the battery according to the capacitance. According to the battery aging state detection method, convenience for detecting the battery electric charge state and the battery health state can be improved. The invention also provides a battery aging detection device and a battery aging detection system.
Description
Technical field
The present invention relates to field of batteries, particularly relate to a kind of battery aging status pick-up unit, battery aging status detection system and battery aging status detection method.
Background technology
For battery, usually need estimating battery state-of-charge (state of charge, SOC) and cell health state (state of health, SOH), to change aging battery in time.In prior art, detection battery charge state and cell health state adopt open-circuit voltage method to detect usually, and particularly, open-circuit voltage method records static at longer a period of time (being generally more than one hour) off-line at battery.But, for the electronic installation that communication base station etc. needs long time running, allow battery off-line within the time is static will have influence on the normal work of communicator etc.Therefore, comparatively inconvenient to the detection of battery charge state and cell health state in prior art.
Summary of the invention
A kind of battery aging status pick-up unit, battery aging status detection system and battery aging status checkout equipment are provided, thus improve the convenience detecting battery charge state and cell health state.
On the one hand, provide a kind of battery aging status pick-up unit, for detecting the battery charge state of battery and cell health state.Described battery aging status pick-up unit comprises current detecting unit, voltage detection unit and control module, described control module carries out charging or discharging for controlling described battery, described voltage detection unit is for detecting magnitude of voltage during described battery charge or discharge, described current detecting unit is for detecting current value during described battery charge or discharge, whether described control module is used for being in a voltage range preset according to described magnitude of voltage to judge whether described battery is in a phase transformation stage of the material of described battery, wherein, described default voltage range is the voltage range that the material of described battery is corresponding when being in a kind of equilibrium stage of phase transformation, the described phase transformation stage refers to that the material of described battery is with a kind of phase sustainable existence stage, when the material of described battery is in a phase transformation stage, within time period corresponding to described phase transformation stage, integration is carried out to described current value, to obtain calculating the capacitance of described battery within the time period corresponding to the described phase transformation stage according to described current value, and present battery state-of-charge function and the present battery health status function of described battery is calculated according to described capacitance.
In the implementation that the first is possible, described control module comprises charge and discharge control subelement and judgment sub-unit, described charge and discharge control subelement carries out charge or discharge for controlling described battery, described judgment sub-unit is for judging whether the magnitude of voltage of described voltage is in a predetermined voltage range, when described magnitude of voltage is in described predetermined voltage range, described judgment sub-unit judges that the material of described battery is in the described phase transformation stage; When described magnitude of voltage is in outside described default voltage range, the material of described battery is not in the described phase transformation stage.
In conjunction with the implementation that the first is possible, in the implementation that the second is possible, described control module also comprises computation subunit, described computation subunit is for calculating the differential of described voltage to electric capacity, described judgment sub-unit judges whether described voltage is more than or equal to one first default value to the differential of electric capacity, and whether described voltage is more than or equal to one second default value to the differential of electric capacity, and when the differential of described voltage to electric capacity is more than or equal to described first default value and described magnitude of voltage time differential is more than or equal to described second default value, judge that the material of described battery is in a described phase transformation stage, wherein, two extreme values that described first default value and described second default value obtain when being respectively the differential of described voltage to electric capacity and two end points of corresponding described predetermined voltage range.
In conjunction with the implementation that the second is possible, in the implementation that the third is possible, described charge and discharge control subelement is also less than or equal to a pre-set current value for controlling described current value, wherein, described pre-set current value represents the higher limit of the electric current that described battery aging status detection method accuracy of detection is corresponding.
In the 4th kind of possible implementation, described battery aging status pick-up unit also comprises a storer, battery charge state function and the cell health state function of described battery is stored in described storer, described control module also comprises renewal subelement, described renewal subelement is used for using the present battery state-of-charge function of described battery and present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
In conjunction with the 4th kind of mode in the cards, in the 5th kind of mode in the cards, described battery aging status pick-up unit also comprises alarm unit, described alarm unit is for receiving a drive singal, and send a warning under the control of described drive singal, described control module also comprises a warning driven element unit, when obtaining corresponding battery aging status according to the battery charge state function of described battery more than a setting threshold value, or according to the cell health state function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, described warning driven element unit sends a drive singal to described alarm unit, send a warning to drive described alarm unit, wherein, described setting threshold value refers to the higher limit of described battery aging status, described Preset Time refers to the lower limit of the remaining runtime of battery.
On the other hand, provide a kind of battery aging status detection system, comprise a charging device, battery, load and a battery aging status pick-up unit.Described charging device is used for charging to described battery, described battery is used for for described load supplying, described battery aging status pick-up unit is used for detecting the battery charge state of battery and cell health state, it is characterized in that, described battery aging status pick-up unit comprises current detecting unit, voltage detection unit and control module, described control module carries out charging or discharging for controlling described battery, described voltage detection unit is for detecting magnitude of voltage during described battery charge or discharge, described current detecting unit is for detecting current value during described battery charge or discharge, whether described control module is used for being in a voltage range preset according to described magnitude of voltage to judge whether described battery is in a certain phase transformation stage of the material of described battery, wherein, described default voltage range is the voltage range that the material of described battery is corresponding when being in a kind of equilibrium stage of phase transformation, the described phase transformation stage refers to that the material of described battery is with a kind of phase sustainable existence stage, when the material of described battery is in the described phase transformation stage, within time period corresponding to described phase transformation stage, integration is carried out to described current value, to obtain calculating one first capacitance of described battery within the time period corresponding to the described phase transformation stage according to described current value, and present battery state-of-charge function and the present battery health status function of described battery is calculated according to described first capacitance.
In the first mode in the cards, described control module comprises charge and discharge control subelement and judgment sub-unit, described charge and discharge control subelement carries out charge or discharge for controlling described battery, described judgment sub-unit is for judging whether the magnitude of voltage of described voltage is in a predetermined voltage range, when described magnitude of voltage is in described predetermined voltage range, described judgment sub-unit judges that the material of described battery is in the described phase transformation stage; When described magnitude of voltage is in outside described default voltage range, the material of described battery is not in the described phase transformation stage.
In conjunction with the first mode in the cards, in the second mode in the cards, described control module also comprises computation subunit, described computation subunit is for calculating the differential of described voltage to electric capacity, described judgment sub-unit judges whether described voltage is more than or equal to one first default value to the differential of electric capacity, and whether described voltage is more than or equal to one second default value to the differential of electric capacity, and when the differential of described voltage to electric capacity is more than or equal to described first default value and described magnitude of voltage time differential is more than or equal to described second default value, judge that the material of described battery is in a described phase transformation stage, wherein, two extreme values that described first default value and described second default value obtain when being respectively the differential of described voltage to electric capacity and two end points of corresponding described predetermined voltage range.
In conjunction with the second mode in the cards, in the third mode in the cards, described charge and discharge control subelement is also less than or equal to a pre-set current value for controlling described current value, wherein, described pre-set current value represents the higher limit of the electric current that described battery aging status detection method accuracy of detection is corresponding.
In the 4th kind of mode in the cards, described battery aging status pick-up unit also comprises a storer, battery charge state function and the cell health state function of described battery is stored in described storer, described control module also comprises renewal subelement, described renewal subelement be used for using according to the present battery state-of-charge function of described battery and present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
In conjunction with the 4th kind of mode in the cards, in the 5th kind of mode in the cards, described battery aging status pick-up unit also comprises alarm unit, described alarm unit is for receiving a drive singal, and send a warning under the control of described drive singal, described control module also comprises a warning driven element unit, when obtaining corresponding battery aging status according to the battery charge state function of described battery more than a setting threshold value, or according to the cell health state function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, described warning driven element unit sends a drive singal to described alarm unit, send a warning to drive described alarm unit, wherein, described setting threshold value refers to the higher limit of described battery aging status, described Preset Time refers to the lower limit of the remaining runtime of battery.
On the other hand, provide a kind of battery aging status detection method, for detecting the battery charge state of battery and cell health state.Described battery aging status detection method comprises the following steps:
Control described battery to carry out charging or discharging;
Magnitude of voltage when detecting described battery charge or discharge and current value;
Whether be in a voltage range preset according to described magnitude of voltage to judge whether described battery is in a phase transformation stage of the material of described battery, wherein, described default voltage range is the voltage range that the material of described battery is corresponding when being in a kind of equilibrium stage of phase transformation, and the described phase transformation stage refers to that the material of described battery is with a kind of phase sustainable existence stage;
When the material of described battery is in a phase transformation stage, within time period corresponding to described phase transformation stage, integration is carried out to described current value, to obtain calculating first capacitance of described battery within the time period corresponding to the described phase transformation stage according to described current value, and calculate present battery state-of-charge function and the present battery health status function of described battery according to described first capacitance.
In the first mode in the cards, judging according to described magnitude of voltage whether described battery is in a phase transformation stage etch of the material of described battery, comprising:
Judge whether the magnitude of voltage of described voltage is in a voltage range preset, and when described magnitude of voltage is in described default voltage range, the material of described battery is in the described phase transformation stage; When the magnitude of voltage of described voltage is in outside described default voltage range, the material of described battery is not in the described phase transformation stage.
In conjunction with the implementation that the first is possible, in the second mode in the cards, described battery aging status detection method also comprises:
Calculate the differential of described voltage to electric capacity;
Judge whether described voltage is more than or equal to one first default value to the differential of electric capacity, and judge whether described voltage is more than or equal to one second default value to the differential of electric capacity, wherein, two extreme values obtained when described first default value and described second default value are respectively the differential of described voltage to electric capacity and two end points of corresponding described predetermined voltage range;
When the differential of described voltage to electric capacity is more than or equal to described first default value and the differential of described voltage to electric capacity is more than or equal to described second default value, judge that the material of described battery is in a described phase transformation stage.
In conjunction with the second mode in the cards, in the third mode in the cards, described battery aging status detection method also comprised before the described voltage of calculating is to the differentiation step of electric capacity:
Control described current value and be less than or equal to a pre-set current value, wherein, described pre-set current value represents the higher limit of the electric current that described battery aging status detection method accuracy of detection is corresponding.
In the 4th kind of mode in the cards, described battery aging status detection method also comprises:
Using the present battery state-of-charge function of described battery and present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
In conjunction with the 4th kind of mode in the cards, in the 5th kind of mode in the cards, described battery aging status detection method also comprises:
When obtaining corresponding battery aging status according to the battery charge state function of described battery more than a setting threshold value, or according to the cell health state function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, send drive singal to alarm unit, send a warning to drive described alarm unit, wherein, described setting threshold value refers to the higher limit of described battery aging status, and described Preset Time refers to the lower limit of the remaining runtime of battery.
According to battery aging status pick-up unit, battery aging status detection system and battery aging status detection method that each implementation provides, when utilizing described battery to carry out charge or discharge, battery material has the different phase transformation stages, whether be in a predetermined voltage range by magnitude of voltage when detecting battery charge or discharge to carry out judging whether described battery is in a phase transformation stage, to choose a phase transformation stage in multiple phase transformation stage.Then, integration is carried out to obtain the first capacitance to the current value of described battery within time corresponding to this phase transformation stage, and calculates present battery state-of-charge function and the present battery health status function of described battery according to described first capacitance.Thus achieve battery online time calculating to battery charge state and cell health state.And then improve the convenience detecting battery charge state and cell health state.
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.
Fig. 1 is the circuit block diagram of the battery aging status detection system of the present invention one better embodiment;
Fig. 2 is the block diagram of the control module shown in Fig. 1;
Fig. 3 is the curve synoptic diagram of voltage relative to the battery charge state of battery of battery of the present invention;
Fig. 4 is the process flow diagram of the battery aging status detection method of the present invention one better embodiment;
Fig. 5 is the process flow diagram of the sub-step in Fig. 4 of the present invention included by step S203.
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.
Refer to Fig. 1, it is the circuit block diagram of the battery aging status detection system 10 of the present invention one better embodiment.Shown battery aging status detection system 10 comprises battery aging status pick-up unit 100, charging device 200, battery 300 and load 400.Described charging device 200 is for charging to described battery 300, and described battery 300 is for powering for described load 400.Described battery 300 can be but be not limited to lithium ion battery.Preferably, the lithium ion battery that described battery 300 is is negative pole with materials such as graphite.Described battery check device 100 detects for the battery charge state (state of charge, SOC) to battery and cell health state (state of health, SOH).The battery charge state of so-called battery refers to, the ratio of remaining electric capacity and its electric capacity when being full of electricity condition completely after battery uses a period of time or after lying idle for a long time.The span of the state-of-charge of battery is 0 ~ 1, and when the state-of-charge of battery equals 0, represent that battery discharge is complete, in battery, remaining capacity is zero; When the state-of-charge of battery equals 1, represent that battery is full of completely.And the cell health state of battery plays an important role in the maintenance, replacing and maintenance etc. of battery.Described battery aging status pick-up unit 100 comprises voltage detection unit 110, current detecting unit 120 and control module 130.Described control module 130 charges to described battery 300 for controlling described charging device 200, or controls described battery 300 and discharge to described load 400.Described voltage detection unit 120 is for detecting magnitude of voltage during described battery 300 charge or discharge, described current detection voltage 110 is for detecting current value during described battery 300 charge or discharge, described control module 130 is for judging according to described magnitude of voltage whether described battery 300 is in a phase transformation stage of the material of described battery 300, when the material of described battery 300 is in a phase transformation stage, the capacitance of described battery 300 within the time period corresponding to the described phase transformation stage is calculated according to described current value, to obtain the first capacitance, and present battery state-of-charge function and the present battery health status function of described battery is calculated according to described first capacitance.So-called phase (phase) refers to, composition is identical, structure is identical, has interface and the even ingredient of the material split with other parts.So-called phase transformation refers to, material, when temperature or pressure or composition etc. change, is the process of another phase from a kind of phase in version.A so-called phase transformation stage refers to, a kind of sustainable existence stage of certain phase of material.
See also Fig. 2, it is the block diagram of the control module 130 shown in Fig. 1.Described control module 130 comprises charge and discharge control subelement 131 and judgment sub-unit 132.Described charge and discharge control subelement 131 charges to described battery 300 for controlling described charging device 200, or controls described battery 300 and discharge to described load 400.Described judgment sub-unit 132 is for judging whether the magnitude of voltage of described voltage is in a predetermined voltage range, and when described magnitude of voltage is in described predetermined voltage range, described judgment sub-unit 132 judges that the material of described battery 300 is in the described phase transformation stage.Voltage range corresponding when described predetermined voltage range refers to that the material of described battery 300 is in the equilibrium stage of certain phase transformation.When the material of described battery 300 is positioned at described predetermined voltage range, the material of described battery 300 is a certain specific phase.When two end points at described predetermined voltage range of the material of described battery 300, the material of described battery 300 undergoes phase transition, that is, two end points of described predetermined voltage range are the point that the material of described battery 300 undergoes phase transition.When the material of described battery 300 is outside described predetermined voltage range, the material 300 of described battery is in other one or more phase transformation stages.See also Fig. 3, in figure 3 in voltage range (V1 ~ V2), the material of described battery 300 is in a kind of equilibrium stage of phase transformation.The material of described battery 300 undergoes phase transition when V1 and V2 2, and outside voltage range (V1 ~ V2), the material of institute's battery 300 is in other one or morely to balance each other the stage.As can be seen here, at the material of battery 300, there is close relationship with voltage range, therefore, can judge whether the material of described battery 300 is in the equilibrium stage of certain phase transformation according to voltage range.
For described battery 300 for lithium ion battery, because electrode material is at Lithium-ion embeding or deviate from process discontinuous phase transformation can occur, therefore, magnitude of voltage--SOC curve presents stepped change, as shown in Figure 3, it is the curve synoptic diagram of voltage relative to the battery charge state of battery of battery of the present invention.As seen from Figure 3, the magnitude of voltage of described battery 300--described SOC curve presents obvious stepped change, visible in figure 3, the magnitude of voltage of described battery--SOC curve comprises three staircase curves, for convenience of describing, described three staircase curves are called after first curve I, the second curve II and the 3rd curve III respectively.The equilibrium stage of described first curve I, described second curve II and the corresponding a kind of phase transformation of described 3rd curve III difference.For described second curve II, the voltage range of described second curve II be changed to V1 ~ V2, two end points of described second curve II are V1 and V2.The present invention utilizes magnitude of voltage--the characteristic of this stepped change of SOC curve of described battery 300 in the process of charging or discharge just, SOC and SOH of a staircase curve to described battery 300 chosen in three staircase curves calculates.Because the voltage difference at two-end-point place is smaller in each staircase curve, be generally tens to tens millivolts.Therefore, the change in voltage between a staircase curve must be amplified, judge precision to improve.
In the present embodiment, described control module 130 also comprises computation subunit 133.Described computation subunit 133 is for calculating described magnitude of voltage time differential.Described computation subunit 133 to described magnitude of voltage to the object that the time carries out differential process be by a staircase curve between change in voltage amplify, judge precision to improve.
Described discharge and recharge subelement 131 is also less than or equal to a pre-set current value for controlling described current value.In order to make the magnitude of voltage of described battery 300--the first curve I in SOC staircase curve, the stepped change of the second curve II and the 3rd curve III is relatively obvious, to improve judgement precision, also needs to limit electric current during described battery 300 charge or discharge.In the present embodiment, current value when described discharge and recharge subelement 131 controls the charge or discharge of described battery 300 is less than or equal to described pre-set current value.Wherein, described pre-set current value refers to obtain stepped good magnitude of voltage--the maximal value of the electric current that SOC Curves needs.That is, in the higher limit of electric current corresponding to current accuracy of detection.When current value when the charge or discharge of described battery 300 is less than or equal to described pre-set current value, described magnitude of voltage--the first curve I in SOC curve, the stepped change of the second curve II and the 3rd curve III is relatively obvious, is conducive to improving judging precision; When current value when the charge or discharge of described battery 300 is greater than described pre-set current value, described magnitude of voltage--the first curve I in SOC curve, the stepped change of the second curve II and the 3rd curve III is relatively not obvious, is unfavorable for improving judging precision.
Described judgment sub-unit 132 is for judging whether described voltage is more than or equal to one first default value to the differential of electric capacity, and whether described magnitude of voltage is more than or equal to one second default value to the differential of electric capacity, and when the differential of described voltage to electric capacity is more than or equal to described first default value and the differential of described voltage to electric capacity is more than or equal to described second default value, described battery 300 is judged as that the material of described battery 300 is in a phase transformation stage.Wherein, two extreme values obtained when described first default value and described second value are respectively the differential of described voltage to electric capacity, that is, two end points of described first default value and the corresponding described predetermined voltage range of described second default value.
Particularly, there is extreme value to the differential of electric capacity in phase transformation place of the material of described battery 300 in described voltage; And at the equilibrium stage of phase, described voltage almost levels off to zero to the differential of electric capacity.For the second curve II, the material of described battery 300 undergoes phase transition when V1 and V2 2, and therefore, described battery is that extreme value appears in V1 and V2 2 places to the differential of electric capacity, that is, described second curve II is phase transformation place at the point that V1 and V2 is corresponding; And at described second curve II except V1 and V2 2, all the other each points are in the stage of balancing each other, described voltage almost levels off to zero to the integration of electric capacity.Therefore, described judgment sub-unit 132 judges whether described voltage is more than or equal to described first default value to the differential of electric capacity, and whether described magnitude of voltage is more than or equal to described second default value to the differential of electric capacity, can judge whether described battery 300 is in a phase transformation stage of its material.
Carry out being charged as example with described battery 300, for described second curve II, described judgment sub-unit 132 judges whether described voltage is more than or equal to described first default value to the differential of electric capacity.When the differential of described magnitude of voltage to electric capacity is more than or equal to described first default value, judge that the magnitude of voltage of described battery 300 is positioned at an end points V1 of described second curve II.The time point called after very first time point t1 that described end points V1 is corresponding when described battery 300 charges, now, described computation subunit 133 starts to start to carry out integration relative to the time at described very first time point t1 to described electric current.Namely the very first time puts t1 is the starting point of current integration.Described judgment sub-unit 132 is also for judging whether described voltage is more than or equal to described second default value to the differential of electric capacity.When the differential of described voltage to electric capacity is more than or equal to described second default value, judge that the magnitude of voltage of described battery 300 arrives another end points V2 of described second curve II.The time point called after second time point t2 that described end points V2 is corresponding when described battery 300 charges, described second time point t2 is the terminal of described current integration.As can be seen here, the integration of the time period of current value between very first time point t1 and the second time point t2 that described computation subunit 133 detects according to described current detecting unit 120, namely obtains first capacitance of described battery 300 within the time period corresponding to the described phase transformation stage.At this, described first capacitance is expressed as Q1.Described computation subunit 133 is revised described battery charge state function and cell health state function according to described first capacitance, to obtain present battery state-of-charge function and present battery health status function.In the present embodiment, described present battery state-of-charge function and present battery health status function are expressed as SOC
1and SOH
1, SOH
1=(1-a+Q
1/ Q
0) * 100%; SOC
1=Q
fcc* f (SOC
0)=Q
0* SOH
1* f (SOC
0)=Q
0* (1-a+Q
1/ Q
0) * f (SOC
0).Wherein, a is constant, Q
0for described battery 300 unaged time capacitance, SOC
0for the original state-of-charge of battery, it is known number.
Described battery status degradation detecting device 100 also comprises a storage unit 140.The initial battery charge state function of described battery 300 and initial cell health state function is stored in described storer 140.Described control module 130 also comprises a renewal subelement 134.Described renewal subelement 134 for according to the present battery state-of-charge function of described battery 300 and described present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
Described battery aging status pick-up unit 100 also comprises alarm unit 150.Described alarm unit 150 for receiving a drive singal, and sends a warning under the control of described drive singal.Described control module 130 also comprises warning driven element unit 135.When obtaining corresponding battery aging status according to the present battery state-of-charge function of described battery 300 more than a setting threshold value, or according to the cell health state function of described battery 300 obtain corresponding battery 300 remaining runtime be less than or equal to a Preset Time time, described warning driven element unit 135 sends a drive singal to described alarm unit 150, to drive described alarm unit 150 to send a warning, change battery 300 in time with reminding user.Wherein, described setting threshold value refers to the higher limit of the ageing state of described battery 300.When the ageing state of described battery 300 does not exceed described setting threshold value, the indices (such as output voltage, output current etc.) that described battery 300 exports can reach ratings; When the ageing state of described battery 300 exceedes described setting threshold value, the output indices (such as output voltage, output current etc.) of described battery 300 all can not reach ratings, and such as, output voltage can not reach rated output voltage, now, can think that described battery 300 needs to change.Described Preset Time can be the lower limit of the remaining runtime of described battery 300.When the remaining runtime of described battery 300 is less than or equal to described Preset Time, then show that the remaining runtime of described battery is few, now, can think that described battery 300 needs to change.Understandably, described Preset Time can be arranged according to actual needs, and such as described Preset Time is 10 minutes.
When battery aging status pick-up unit provided by the invention and battery aging status detection system utilize described battery 300 to carry out charge or discharge, battery material has the different phase transformation stages, whether be in a predetermined voltage range by magnitude of voltage when detecting battery 300 charge or discharge to carry out judging whether described battery 300 is in a phase transformation stage, to choose a phase transformation stage in multiple phase transformation stage.Then, integration is carried out to obtain the first capacitance to the current value of described battery 300 within time corresponding to this phase transformation stage, and calculates present battery state-of-charge function and the present battery health status function of described battery 300 according to described first capacitance.Thus achieve battery 300 online time calculating to battery charge state and cell health state.And then improve the convenience detecting battery charge state and cell health state.
Be introduced below in conjunction with Fig. 1 ~ 3 pair battery aging status detection method of the present invention, refer to Fig. 4, it is the process flow diagram of the battery aging status detection method of the present invention one better embodiment.Described cell degradation detection method is used for detecting the state-of-charge of battery 300 and cell health state.Described cell degradation detection method comprises the following steps.
Step S201, controls described battery 300 and carries out charge or discharge.
Particularly, described charge and discharge control subelement 131 controls described charging device 200 and charges to described battery 300, or controls described battery 300 and discharge to described load 400.
Step S202, magnitude of voltage when detecting described battery 300 charge or discharge and current value.
Particularly, magnitude of voltage when described voltage detection unit 110 detects described battery 300 charge or discharge; Described current detecting unit 120 detects current value during described battery 300 charge or discharge.
According to described magnitude of voltage, step S203, judges whether described battery 300 is in a phase transformation stage of the material of described battery 300.
Particularly, described judgment sub-unit 132 judges whether described battery value is in a predetermined voltage range, and when described magnitude of voltage is in described predetermined voltage range, described judgment sub-unit 132 judges that the material of described battery 300 is in a phase transformation stage.When described magnitude of voltage is not in described default voltage range, described judgment sub-unit 132 judges that the material of described battery 300 is not be in complete phase transformation stage, or is in other phase transformations.
Change in embodiment at other, judge that the method whether described battery 300 is in a phase transformation stage of the material of described battery 300 can also comprise the following steps according to described magnitude of voltage.Refer to Fig. 5, it is the process flow diagram of the sub-step in Fig. 4 of the present invention included by step S203.
Step S2031, controls described current value and is less than or equal to a pre-set current value.
Particularly, described discharge and recharge subelement 131 controls described current value and is less than or equal to a pre-set current value.In order to make the first curve I in the magnitude of voltage-SOC staircase curve of described battery 300, the stepped change of the second curve II and the 3rd curve III is relatively obvious, judge precision to improve, described discharge and recharge subelement 131 limits electric current during described battery 300 charge or discharge.
Step S2032, calculates the differential of described voltage to electric capacity.
Particularly, described computation subunit 133 calculates the differential of described voltage to electric capacity.Described computation subunit 133 carries out differential the change in voltage in each staircase curve to be amplified, to improve judgement precision with calculating described voltage to electric capacity.
Step S2033, judge whether described voltage is more than or equal to one first default value to the differential of electric capacity, and judge whether described voltage is more than or equal to one second default value to the differential of electric capacity, wherein, two end points of described first default value and the corresponding described predetermined voltage range of described second default value.
Particularly, described judgment sub-unit 132 judges whether described voltage is more than or equal to described first default value to the differential of electric capacity, and judges whether described voltage is more than or equal to described one or two default values to the differential of electric capacity.Extreme value is there is in phase transformation place of the material of described battery 300 in described voltage to the differential of electric capacity; And at the equilibrium stage of phase transformation, described voltage almost levels off to zero to the differential of electric capacity.Therefore, described judgment sub-unit 132 judges whether described voltage is more than or equal to described first default value to the differential of electric capacity, and whether described magnitude of voltage is more than or equal to described second default value to the differential of electric capacity, to judge that described battery 300 is in a phase transformation stage of its material.
Step S2034, when the differential of described voltage to electric capacity is more than or equal to described first default value and the differential of described voltage to electric capacity is more than or equal to described second default value, judges that the material of described battery 300 is in a described phase transformation stage.
Step S2035, when the differential of described voltage to electric capacity is less than described first default value and the differential of described voltage to electric capacity is less than described second default value, the material of described battery 300 is not in a described phase transformation stage.
Step S204, when the material of described battery 300 is in a phase transformation stage, calculate the capacitance of described battery 300 within the time period corresponding to the described phase transformation stage according to described current value, and calculate present battery state-of-charge function and the present battery health status function of described battery 300 according to described capacitance.
Step S205, upgrades battery charge state function and the cell health state function of described battery 300 according to the present battery state-of-charge function of described battery 300 and described present battery health status function.
Particularly, using the current state-of-charge function of described battery 300 and current health function of state as the current state-of-charge function of described battery 300 and cell health state function, to upgrade battery charge state function and the cell health state function of described battery 300.
Step S206, when obtaining corresponding battery aging status according to the present battery state-of-charge function of described battery 300 more than a setting threshold value, or according to the present battery health status function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, send drive singal to alarm unit 150, send a warning to drive described alarm unit 150.Battery 300 is changed in time with reminding user.
Battery aging status detection method provided by the invention, charge or discharge are carried out by controlling battery, magnitude of voltage during detection charge or discharge and current value, judge whether battery is in a phase transformation stage of battery material according to described battery value, and when the material of battery is in the stage of a phase transformation, calculate first capacitance of battery within the time period corresponding to the described phase transformation stage according to described current value, and calculate present battery state-of-charge function and the present battery health status function of battery according to described first capacitance.Thus achieve battery online time calculating to battery charge state and cell health state.And then improve the convenience detecting battery charge state and cell health state.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (18)
1. a battery aging status pick-up unit, for detecting the battery charge state of power supply and cell health state, it is characterized in that, described battery aging status pick-up unit comprises current detecting unit, voltage detection unit and control module, described control module carries out charging or discharging for controlling described battery, described voltage detection unit is for detecting magnitude of voltage during described battery charge or discharge, described current detecting unit is for detecting current value during described battery charge or discharge, whether described control module is used for being in a voltage range preset according to described magnitude of voltage to judge whether described battery is in a phase transformation stage of the material of described battery, wherein, described default voltage range is the voltage range that the material of described battery is corresponding when being in a kind of equilibrium stage of phase transformation, the described phase transformation stage refers to that the material of described battery is with a kind of phase sustainable existence stage, when the material of described battery is in a phase transformation stage, within time period corresponding to described phase transformation stage, integration is carried out to described current value, to obtain calculating the capacitance of described battery within the time period corresponding to the described phase transformation stage according to described current value, and present battery state-of-charge function and the present battery health status function of described battery is calculated according to described capacitance.
2. battery aging status pick-up unit as claimed in claim 1, it is characterized in that, described control module comprises charge and discharge control subelement and judgment sub-unit, described charge and discharge control subelement carries out charge or discharge for controlling described battery, described judgment sub-unit is for judging whether the magnitude of voltage of described voltage is in a predetermined voltage range, when described magnitude of voltage is in described predetermined voltage range, described judgment sub-unit judges that the material of described battery is in the described phase transformation stage; When described magnitude of voltage is in outside described default voltage range, the material of described battery is not in the described phase transformation stage.
3. battery aging status pick-up unit as claimed in claim 2, it is characterized in that, described control module also comprises computation subunit, described computation subunit is for calculating the differential of described voltage to electric capacity, described judgment sub-unit judges whether described voltage is more than or equal to one first default value to the differential of electric capacity, and whether described voltage is more than or equal to one second default value to the differential of electric capacity, and when the differential of described voltage to electric capacity is more than or equal to described first default value and described magnitude of voltage time differential is more than or equal to described second default value, judge that the material of described battery is in a described phase transformation stage, wherein, two extreme values that described first default value and described second default value obtain when being respectively the differential of described voltage to electric capacity and two end points of corresponding described predetermined voltage range.
4. battery aging status pick-up unit as claimed in claim 3, it is characterized in that, described charge and discharge control subelement is also less than or equal to a pre-set current value for controlling described current value, wherein, described pre-set current value represents the higher limit of the electric current that described battery aging status detection method accuracy of detection is corresponding.
5. battery aging status pick-up unit as claimed in claim 1, it is characterized in that, described battery aging status pick-up unit also comprises a storer, battery charge state function and the cell health state function of described battery is stored in described storer, described control module also comprises renewal subelement, described renewal subelement is used for the present battery state-of-charge function of described battery and present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
6. battery aging status pick-up unit as claimed in claim 5, it is characterized in that, described battery aging status pick-up unit also comprises alarm unit, described alarm unit is for receiving a drive singal, and send a warning under the control of described drive singal, described control module also comprises a warning driven element unit, when obtaining corresponding battery aging status according to the battery charge state function of described battery more than a setting threshold value, or according to the cell health state function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, described warning driven element unit sends a drive singal to described alarm unit, send a warning to drive described alarm unit, wherein, described setting threshold value refers to the higher limit of described battery aging status, described Preset Time refers to the lower limit of the remaining runtime of battery.
7. a battery aging status detection system, comprise a charging device, battery, load and a battery aging status pick-up unit, described charging device is used for charging to described battery, described battery is used for for described load supplying, described battery aging status pick-up unit is used for detecting the battery charge state of battery and cell health state, it is characterized in that, described battery aging status pick-up unit comprises current detecting unit, voltage detection unit and control module, described control module carries out charging or discharging for controlling described battery, described voltage detection unit is for detecting magnitude of voltage during described battery charge or discharge, described current detecting unit is for detecting current value during described battery charge or discharge, whether described control module is used for being in a voltage range preset according to described magnitude of voltage to judge whether described battery is in a certain phase transformation stage of the material of described battery, wherein, described default voltage range is the voltage range that the material of described battery is corresponding when being in a kind of equilibrium stage of phase transformation, the described phase transformation stage refers to that the material of described battery is with a kind of phase sustainable existence stage, when the material of described battery is in the described phase transformation stage, within time period corresponding to described phase transformation stage, integration is carried out to described current value, to obtain calculating one first capacitance of described battery within the time period corresponding to the described phase transformation stage according to described current value, and present battery state-of-charge function and the present battery health status function of described battery is calculated according to described first capacitance.
8. battery aging status detection system as claimed in claim 7, it is characterized in that, described control module comprises charge and discharge control subelement and judgment sub-unit, described charge and discharge control subelement carries out charge or discharge for controlling described battery, described judgment sub-unit is for judging whether the magnitude of voltage of described voltage is in a predetermined voltage range, when described magnitude of voltage is in described predetermined voltage range, described judgment sub-unit judges that the material of described battery is in the described phase transformation stage; When described magnitude of voltage is in outside described default voltage range, the material of described battery is not in the described phase transformation stage.
9. battery aging status detection system as claimed in claim 8, it is characterized in that, described control module also comprises computation subunit, described computation subunit is for calculating the differential of described voltage to electric capacity, described judgment sub-unit judges whether described voltage is more than or equal to one first default value to the differential of electric capacity, and whether described voltage is more than or equal to one second default value to the differential of electric capacity, and when the differential of described voltage to electric capacity is more than or equal to described first default value and described magnitude of voltage time differential is more than or equal to described second default value, judge that the material of described battery is in a described phase transformation stage, wherein, two extreme values that described first default value and described second default value obtain when being respectively the differential of described voltage to electric capacity and two end points of corresponding described predetermined voltage range.
10. battery aging status detection system as claimed in claim 9, it is characterized in that, described charge and discharge control subelement is also less than or equal to a pre-set current value for controlling described current value, wherein, described pre-set current value represents the higher limit of the electric current that described battery aging status detection method accuracy of detection is corresponding.
11. battery aging status detection systems as claimed in claim 7, it is characterized in that, described battery aging status pick-up unit also comprises a storer, battery charge state function and the cell health state function of described battery is stored in described storer, described control module also comprises renewal subelement, described renewal subelement is used for the present battery state-of-charge function of described battery and present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
12. battery aging status detection systems as claimed in claim 11, it is characterized in that, described battery aging status pick-up unit also comprises alarm unit, described alarm unit is for receiving a drive singal, and send a warning under the control of described drive singal, described control module also comprises a warning driven element unit, when obtaining corresponding battery aging status according to the battery charge state function of described battery more than a setting threshold value, or according to the cell health state function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, described warning driven element unit sends a drive singal to described alarm unit, send a warning to drive described alarm unit, wherein, described setting threshold value refers to the higher limit of described battery aging status, described Preset Time refers to the lower limit of the remaining runtime of battery.
13. 1 kinds of battery aging status detection methods, for detecting the battery charge state of battery and cell health state, comprising:
Control described battery to carry out charging or discharging;
Magnitude of voltage when detecting described battery charge or discharge and current value;
Whether be in a voltage range preset according to described magnitude of voltage to judge whether described battery is in a phase transformation stage of the material of described battery, wherein, described default voltage range is the voltage range that the material of described battery is corresponding when being in a kind of equilibrium stage of phase transformation, and the described phase transformation stage refers to that the material of described battery is with a kind of phase sustainable existence stage;
When the material of described battery is in a phase transformation stage, within time period corresponding to described phase transformation stage, integration is carried out to described current value, to obtain the capacitance of described battery within the time period corresponding to the described phase transformation stage, and calculate present battery state-of-charge function and the present battery health status function of described battery according to described capacitance.
14. battery aging status detection methods as claimed in claim 13, is characterized in that, are judging whether described battery is in a phase transformation stage etch of the material of described battery, comprising according to described magnitude of voltage:
Judge whether the magnitude of voltage of described voltage is in a voltage range preset, and when described magnitude of voltage is in described default voltage range, the material of described battery is in the described phase transformation stage; When the magnitude of voltage of described voltage is in outside described default voltage range, the material of described battery is not in the described phase transformation stage.
15. battery aging status detection methods as claimed in claim 14, it is characterized in that, described battery aging status detection method also comprises:
Calculate the differential of described voltage to electric capacity;
Judge whether described voltage is more than or equal to one first default value to the differential of electric capacity, and judge whether described voltage is more than or equal to one second default value to the differential of electric capacity, wherein, two extreme values obtained when described first default value and described second default value are respectively the differential of described voltage to electric capacity and two end points of corresponding described predetermined voltage range;
When the differential of described voltage to electric capacity is more than or equal to described first default value and the differential of described voltage to electric capacity is more than or equal to described second default value, judge that the material of described battery is in a described phase transformation stage.
16. battery aging status detection methods as claimed in claim 15, is characterized in that, described battery aging status detection method also comprised before the described voltage of calculating is to the differentiation step of electric capacity:
Control described current value and be less than or equal to a pre-set current value, wherein, described pre-set current value represents the higher limit of the electric current that described battery aging status detection method accuracy of detection is corresponding.
17. battery aging status detection methods as claimed in claim 13, it is characterized in that, described battery aging status detection method also comprises:
Using the present battery state-of-charge function of described battery and present battery health status function as the current battery charge state function of described battery and cell health state function, to upgrade battery charge state function and the cell health state function of described battery.
18. battery aging status detection methods as claimed in claim 17, it is characterized in that, described battery aging status detection method also comprises:
When obtaining corresponding battery aging status according to the battery charge state function of described battery more than a setting threshold value, or according to the cell health state function of described battery obtain corresponding remaining battery be less than or equal to a Preset Time working time time, send drive singal to alarm unit, send a warning to drive described alarm unit, wherein, described setting threshold value refers to the higher limit of described battery aging status, and described Preset Time refers to the lower limit of the remaining runtime of battery.
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