CN104135041A - Diagnosis method and diagnosis equipment of battery cell - Google Patents
Diagnosis method and diagnosis equipment of battery cell Download PDFInfo
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- CN104135041A CN104135041A CN201410160792.9A CN201410160792A CN104135041A CN 104135041 A CN104135041 A CN 104135041A CN 201410160792 A CN201410160792 A CN 201410160792A CN 104135041 A CN104135041 A CN 104135041A
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Abstract
The invention discloses a diagnosis method of a battery cell. The diagnosis method is used for a plurality of single battery cells in a battery device. The battery device comprises the single battery cells and a plurality of equalization circuits corresponding to the single battery cells. The diagnosis method of the battery cell comprises the steps of (1) obtaining a voltage value before opening of the corresponding single battery cell, a voltage value after opening for preset time and a current value during equalization when any equalization circuit is opened, and (2) calculating an internal resistance value of the corresponding single battery cell, judging whether the single battery cell is normal according to the internal resistance value and performing alarming if any abnormity. According to the diagnosis method, no separate internal resistance detection module is required for detecting the internal resistance value of the single battery cell with equalization motion; the stability is high; the coordination is good; a user can be timely informed to replace the abnormal single battery cell when the single battery cell is aged or damaged; internal resistance measurement is only performed on the single battery cell with equalization opening; and the power consumption is low. The invention further discloses diagnosis equipment of the battery cell.
Description
Technical field
The present invention relates to a kind of diagnosis of cell apparatus, relate in particular to a kind of battery battery core diagnostic method and equipment.
Background technology
Existing battery pack battery core balancer is in order to reach in balancing battery group the object of capacity between battery core, no matter be passive type or active equilibrium, its working mechanism is all that battery core energy is shifted or dissipated, then when energy shifts or dissipates, there is no self diagnosis process, real causes that can not the equilibrium of Efficient Evaluation battery core, also cannot replace in time battery core aging, that damage, thus cause mistake balanced, reduce balanced efficiency, even further destroy the generation of battery core equilibrium appearance in battery pack.In actual battery group is used, frequently repeatedly carry out balanced battery core for certain joint especially, it occurs that abnormal possibility is very high, continuing to use to affect whole group of battery core performance, so be necessary to carry out specific aim diagnosis.The invention belongs to battery management system field, be mainly used in new forms of energy product, include but not limited to following content: lithium-ions battery management system, lithium polymer battery battery management system, lead accumulator, nickel-cadmium cell, Ni-MH battery, super capacitor, energy-accumulating power station, communication back-up source, family's energy-storage system, electric bicycle, battery-operated motor cycle, the peripheral electron circuit of electric automobile and following novel electric vehicle product.
It is balanced with active balanced that current existing battery core balancing technique is divided into passive type, wherein passive type equilibrium is simpler, discharge at the battery core positive and negative end access resistance of needs equilibrium by control switch, general equilibrium electric current is less and be not steady state value, mainly be applicable to the equilibrium of battery core charging end, equilibrium dissipates battery core energy with hot form; Active equilibrium is more complicated, its advantage is that heat dissipation is little, balanced efficiency is high, implementation method for first by single-unit battery core stored energy in the energy storage devices such as inductance, electric capacity, transformer, then be released into other single-unit battery cores or energy storage end line via this type of energy storage device; Whether current balancing technique and device all do not have self-diagnostic function, the first cannot diagnose the internal resistance state of battery core normal, cannot learn whether battery core is to cause because aging, damage cause interior resistive that greatly balanced situation occurs; Whether normally its two existing balancing technique and device cannot know the equilibrium operation of itself, for example balanced loop open circuit, meet in the situation of equilibrium condition balancer without euqalizing current, because cannot know the abnormal of balancer, so this fault is difficult to be found and repair.
Moreover, currently available technology can realize the mode of single-unit battery core internal resistance state-detection for add separately an internal resistance measurement module outside balancer again, the balancer of above-mentioned this kind of structure increases internal resistance measurement module on the basis of single equilibrium module, must increase the complexity of device, affect stability and the coordinated row of device, and cause the cost of balancer to rise, although this kind of structure can detect the internal resistance state of single-unit battery core, still cannot self diagnosis force equalization mechanism whether occur extremely.Internal resistance measurement module is Kelvin's mode of connection in addition, and when internal resistance measurement module is carried out internal resistance measurement, itself need to emit or absorb exciting current, and the generation essence of this exciting current is energy loss; The function that internal resistance measurement device does not select battery core to measure, be that internal resistance measurement is measured battery core non-selectivity, so need to carry out internal resistance measurement action to battery core while measuring internal resistance, not abnormal to internal resistance, frequently repeatedly do not carry out balanced battery core, internal resistance measurement, without practical significance, has increased module dissipation and detection time.
Therefore, be badly in need of the battery battery core diagnostic method and the equipment that address the above problem.
Summary of the invention
The object of this invention is to provide a kind of battery battery core diagnostic method, can measure monomer battery core and whether occur normally by detecting the monomer battery core internal resistance value when balanced, low in energy consumption.
Whether another object of the present invention is to provide a kind of battery battery core diagnostic device, can measure monomer battery core and occur normally by detecting the monomer battery core internal resistance value when balanced, low in energy consumption.
To achieve these goals, the invention provides a kind of battery battery core diagnostic method, for diagnosing the monomer battery core in cell apparatus, described cell apparatus comprises some monomer battery cores, equalizing circuit corresponding to some and described monomer battery core, described battery battery core diagnostic method comprises: (1), in the time that arbitrarily the corresponding described equalizing circuit of monomer battery core is opened, obtains magnitude of voltage V0 before the unlatching of the monomer battery core corresponding with the equalizing circuit of opening, current value I while opening magnitude of voltage V1 after Preset Time and equilibrium; (2) foundation described magnitude of voltage V0, magnitude of voltage V1 and current value I are calculated the internal resistance value Rin of the monomer battery core of described correspondence, judge that according to described internal resistance value Rin whether described monomer battery core is normal, and at the abnormal alarm of described monomer battery core.
Compared with prior art, the present invention is after equalizing circuit is opened, gather magnitude of voltage V0 before the unlatching of corresponding monomer battery core, magnitude of voltage V1 and euqalizing current value I after opening, thereby calculate the internal resistance value Rin of this monomer battery core, judge that with this whether this monomer battery core is normal, thereby in the time of this monomer electric core aging or damage, and alarm, notify user to change abnormal monomer battery core.On the other hand, the present invention only carries out internal resistance measurement to opening balanced monomer battery core, and other monomer battery cores are not carried out to internal resistance measurement, low in energy consumption, measures fast.Again on the one hand, the present invention carries out the internal resistance of monomer battery core and calculates in balanced, does not require that cell apparatus quits work, and saves time and resource.Again on the one hand, the present invention calculates the internal resistance value Rin of described monomer battery core by gathering magnitude of voltage V0, magnitude of voltage V1 and euqalizing current value I, without independent internal resistance detection module is set, make cell apparatus simple in structure, and stability is high, harmony good.
Preferably, in described step (2), calculate the internal resistance value Rin of described monomer battery core according to formula Rin=|V1-V0|/I.
Preferably, between described step (1) and step (2), also comprise: judge whether described euqalizing current value I is zero, judge whether described euqalizing current value I is zero, if report to the police, thereby assert the connecting line fault of equalizing circuit or monomer battery core, carry out if not described step (2).
Preferably, in described step (2), judge that according to internal resistance value Rin the whether normal method of described monomer battery core comprises: whether the internal resistance value Rin that judges described monomer battery core exceeds preset range, if report to the police, thereby assert the monomer electric core aging of described correspondence or abnormal, return if not, thereby assert that described monomer battery core is normal.
Preferably, be different from above-described embodiment, in another embodiment, in described step (2), judge that according to internal resistance value Rin the whether normal method of described monomer battery core comprises: the resistance value Rin of monomer battery core described in when the each equilibrium of record, and pass through formula
calculate the reliable internal resistance value Rin_ave from the 1st to m time balanced opening process generation of described monomer battery core, and whether the monomer battery core that judges described correspondence according to described reliable internal resistance value Rin_ave is normal, internal resistance value when wherein Rinx is the x time of described monomer battery core balanced unlatching, m is the last balanced numbering of opening of described monomer battery core, x=1,2,3 ... m.The method is especially in cell apparatus, frequently repeatedly carrying out balanced monomer battery core has positive effect, can be in the time that a certain monomer battery core be frequently carried out equilibrium, diagnose out this monomer battery core abnormal, remind this joint monomer battery core of user probably to occur electric core aging or damage.
In order to realize another object of the present invention, the invention also discloses a kind of battery battery core diagnostic device, for diagnosing the monomer battery core in cell apparatus, described cell apparatus comprises some monomer battery cores, equalizing circuit corresponding to some and described monomer battery core, described battery battery core diagnostic device comprises voltage acquisition end, current collection circuit, control unit and alarm unit, described voltage acquisition end have several and corresponding with described monomer battery core, for gathering the voltage of corresponding described monomer battery core; Described current collection circuit have several and corresponding with described monomer battery core, for gathering the electric current between corresponding described monomer battery core and equalizing circuit; Described control unit is in the time that monomer battery core is opened arbitrarily, magnitude of voltage V1 and euqalizing current value I after magnitude of voltage V0, unlatching Preset Time before the unlatching of monomer battery core corresponding to equalizing circuit obtaining and open, calculate the internal resistance value Rin of the monomer battery core of described correspondence according to described magnitude of voltage V0, magnitude of voltage V1 and euqalizing current value I, judge that according to described internal resistance value Rin whether described monomer battery core is normal, and export corresponding diagnostic signal in the time that described monomer battery core is abnormal; Described alarm unit is reported to the police according to described diagnostic signal.
Compared with prior art, the present invention is after equalizing circuit is opened, gather magnitude of voltage V0 before the unlatching of corresponding monomer battery core, magnitude of voltage V1 and euqalizing current value I after opening, thereby calculate the internal resistance value Rin of this monomer battery core, judge that with this whether this monomer battery core is normal, thereby in the time of this monomer electric core aging or damage, and alarm, notify user to change abnormal monomer battery core.On the other hand, the present invention only carries out internal resistance measurement to opening balanced monomer battery core, and other monomer battery cores are not carried out to internal resistance measurement, low in energy consumption, measures fast.Again on the one hand, the present invention carries out the internal resistance of monomer battery core and calculates in balanced, does not require that cell apparatus quits work, and saves time and resource.Again on the one hand, the present invention calculates the internal resistance value Rin of described monomer battery core by gathering magnitude of voltage V0, magnitude of voltage V1 and euqalizing current value I, without independent internal resistance detection module is set, make cell apparatus simple in structure, and stability is high, harmony good.
Preferably, described control unit calculates the internal resistance value Rin of described monomer battery core according to formula Rin=|V1-V0|/I.
Preferably, described control unit also judges whether described euqalizing current value I is zero before calculating described internal resistance value Rin, if send corresponding diagnostic signal, thereby the connecting line fault of identification equalizing circuit or monomer battery core is calculated described internal resistance value Rin if not.
Preferably, described control unit judges that according to described internal resistance value Rin the whether normal method of monomer battery core of described correspondence comprises: whether the internal resistance value Rin that judges the monomer battery core of described correspondence exceeds preset range, if export corresponding diagnostic signal to assert monomer electric core aging or the fault of described correspondence, return if not.
Preferably, described battery battery core diagnostic device also comprises memory cell, described control unit judges that according to described internal resistance value Rin the whether normal method of monomer battery core of described correspondence comprises: the resistance value Rin of monomer battery core described in while controlling the each equilibrium of described unit records, passes through formula
calculate the reliable internal resistance value Rin_ave from the 1st to m time balanced opening process generation of described monomer battery core, and whether the monomer battery core that judges described correspondence according to described reliable internal resistance value Rin_ave is normally to export corresponding diagnostic signal, internal resistance value when wherein Rinx is the x time of described monomer battery core balanced unlatching, m is the last balanced numbering of opening of described monomer battery core, x=1,2,3 ... m.The method is especially in cell apparatus, frequently repeatedly carrying out balanced monomer battery core has positive effect, can be in the time that a certain monomer battery core be frequently carried out equilibrium, diagnose out this monomer battery core abnormal, remind this joint monomer battery core of user probably to occur electric core aging or damage.
Brief description of the drawings
Fig. 1 is the circuit diagram of cell apparatus of the present invention.
Fig. 2 is the circuit diagram of equalizing circuit in cell apparatus of the present invention
Fig. 3 is the structured flowchart of battery battery core diagnostic device in cell apparatus of the present invention.
Fig. 4 is state diagram when monomer battery core is discharged in cell apparatus of the present invention.
Fig. 5 is state diagram when monomer battery core is charged in cell apparatus of the present invention.
Fig. 6 a is the flow chart of battery battery core diagnostic method the first embodiment of the present invention.
Fig. 6 b is the flow chart of battery battery core diagnostic method the second embodiment of the present invention.
Fig. 7 is the flow chart of battery battery core diagnostic method the 3rd embodiment of the present invention.
Fig. 8 is the flow chart of battery battery core diagnostic method the 4th embodiment of the present invention.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with execution mode and coordinate accompanying drawing to be explained in detail.
With reference to figure 6, the invention discloses a kind of battery battery core diagnostic method, for diagnosing the monomer battery core 11 in cell apparatus 100, with reference to figure 2, described cell apparatus 100 comprises some monomer battery cores 11, equalizing circuit 12 corresponding to some and described monomer battery core 11, described battery battery core diagnostic method comprises: (31), in the time that arbitrarily equalizing circuit is opened, obtain magnitude of voltage V0 before the unlatching of the monomer battery core corresponding with the equalizing circuit of opening, current value I while opening magnitude of voltage V1 after Preset Time and equilibrium; (32) foundation described magnitude of voltage V0, magnitude of voltage V1 and current value I are calculated the internal resistance value Rin of the monomer battery core of described correspondence, wherein calculate the internal resistance value Rin of described monomer battery core according to formula Rin=|V1-V0|/I.(33) judge that according to described internal resistance value Rin whether described monomer battery core is abnormal, if report to the police (34), return if not.Wherein, can calculate internal resistance value Rin according to other formula, be not limited in above-mentioned formula.
Preferably, with reference to figure 6b, for the second embodiment of battery battery core diagnostic method of the present invention, different from a upper embodiment, in the present embodiment, described step also comprises after (31), (35) judge whether described euqalizing current value I is zero, if (36) report to the police, thereby assert the connecting line fault of equalizing circuit or monomer battery core, reach the object of self diagnosis equalizing circuit fault, perform step if not (32).
With reference to figure 7, for the 3rd embodiment of battery battery core diagnostic method of the present invention, in the present embodiment, the concrete steps of described step (33) are: whether the internal resistance value Rin that (33a) judges described monomer battery core exceeds preset range, if (34) report to the police, thereby assert the aging or fault of described monomer battery core 11.
With reference to figure 8, for the 4th embodiment of battery battery core diagnostic method of the present invention, different from the 3rd embodiment, in the present embodiment, the concrete steps of described step (33) are: the resistance value Rin of monomer battery core described in while (331b) recording each equilibrium; (332b) pass through formula
calculate the reliable internal resistance value Rin_ave from the 1st to m time balanced opening process generation of described monomer battery core, and according to described reliable internal resistance value Rin_ave, internal resistance value when wherein Rinx is the x time of described monomer battery core balanced unlatching, m is the last balanced numbering of opening of described monomer battery core, x=1,2,3 ... m; (333b) judge that whether described reliable internal resistance value Rin_ave exceeds preset value, if report to the police (34), returns if not.The method is especially in cell apparatus, frequently repeatedly carrying out balanced monomer battery core has positive effect, can be in the time that a certain monomer battery core be frequently carried out equilibrium, diagnose out this monomer battery core abnormal, remind this joint monomer battery core of user probably to occur electric core aging or damage.
Referring to figs. 1 to Fig. 3, the invention also discloses a kind of battery battery core diagnostic device, this battery battery core diagnostic device 200 is for diagnosing the monomer battery core 11 in cell apparatus 100, with reference to figure 1 and Fig. 2, described cell apparatus 100 comprises some monomer battery cores 11, the equalizing circuit 12 that some and described monomer battery core 11 is corresponding, the energy bus 13 being connected with some described equalizing circuits 12, described balancer is arranged between corresponding monomer battery core 11 and energy bus 13, described energy bus 13 can connect this cell apparatus 100, also can connect on other cell apparatus or other energy storage systems, control unit 23 in described cell apparatus 100 can obtain the magnitude of voltage of the interior some monomer battery cores 11 of described cell apparatus 100, and in the time that the magnitude of voltage of any monomer battery core 11 is abnormal (magnitude of voltage of this monomer battery core 11 is higher or lower than situations such as other monomer battery cores), controlling the equalizing circuit 12 of abnormal monomer battery core 11 correspondences opens, this monomer battery core 11 is charged or discharges to energy bus 13 from energy bus 13 by equalizing circuit 12.With reference to figure 3, described battery battery core diagnostic device 200 comprises voltage acquisition end 21, current collection circuit 22, control unit 23 and alarm unit 24, described voltage acquisition end 21 have several and corresponding with described monomer battery core 11, for gathering the voltage of corresponding described monomer battery core 11; Described current collection circuit 22 have several and corresponding with described monomer battery core 11, for gathering the electric current of corresponding described monomer battery core 11 when balanced; Described control unit 23 is in the time that equalizing circuit 12 is opened arbitrarily, magnitude of voltage V1 and euqalizing current value I after magnitude of voltage V0, unlatching Preset Time before the unlatching of monomer battery core 11 corresponding to equalizing circuit 12 obtaining and open, calculate the internal resistance value Rin of the monomer battery core of described correspondence according to described magnitude of voltage V0, magnitude of voltage V1 and current value I, particularly, calculate the internal resistance value Rin of described monomer battery core according to formula Rin=|V1-V0|/I; Judge that according to internal resistance value Rin whether described monomer battery core 11 is normally to export corresponding diagnostic signal; Described alarm unit 24 is reported to the police according to described diagnostic signal.
Wherein, described control unit 23 judges that according to internal resistance value Rin the whether normal method of described monomer battery core 11 comprises: whether the internal resistance value Rin that judges described monomer battery core 11 exceeds preset range, if judge that described monomer battery core 11 is aging or extremely to send corresponding diagnostic signal, thereby judge fast the whether aging or fault of monomer battery core 11.
In another embodiment, described battery battery core diagnostic device 200 also comprises memory cell 25, described control unit 23 judges that according to internal resistance value Rin the whether normal method of described monomer battery core 11 comprises: the resistance value Rin of monomer battery core described in when the each equilibrium of described control unit 23 control store unit 25 record, described control unit 23 also passes through formula
calculate the reliable internal resistance value Rin_ave from the 1st to m time balanced opening process generation of described monomer battery core 11, and judge that according to described reliable internal resistance value Rin_ave whether described monomer battery core 11 is normally to export corresponding diagnostic signal, internal resistance value when wherein Rinx is the x time of described monomer battery core balanced unlatching, m is the last balanced numbering of opening of described monomer battery core 11, x=1,2,3 ... m.The method is especially in cell apparatus, frequently repeatedly carrying out balanced monomer battery core has positive effect, can be in the time that a certain monomer battery core be frequently carried out equilibrium, diagnose out this monomer battery core abnormal, remind this joint monomer battery core of user probably to occur electric core aging or damage.
In another embodiment, described control unit 23 is before calculating internal resistance value Rin, also judge whether described current value I is zero, if exporting corresponding diagnostic signal reports to the police to control alarm unit 24, thereby assert the connecting line fault of equalizing circuit 12 or monomer battery core 11, calculate if not internal resistance value Rin.
With reference to figure 4 and Fig. 5, operation principle while describing cell apparatus 100 equilibrium of the present invention, with reference to figure 4, if when the voltage of a certain monomer battery core 11 is greater than other monomer battery cores, the magnitude of voltage that described control unit 23 collects according to voltage acquisition end 21 is exported primary side switching tube Q1 described in a control signal control to level end switch pipe Q1 at the beginning of the equalizing circuit 12 of these monomer battery core 11 correspondences and is opened, the energy of monomer battery core 11 discharges by inductance L and capacitor C and the backward energy bus 13 of two-way transformer T1, meanwhile, magnitude of voltage V0 before the equalizing circuit 12 of described control unit 23 these monomer battery cores 11 of acquisition is opened, open magnitude of voltage V1 after preset time t 1 and stable current value I when balanced, judge whether described current value I is zero, if control the connecting line fault that alarm unit 24 is reported to the police and assert equalizing circuit 12 or monomer battery core 11, if not according to described magnitude of voltage V0, magnitude of voltage V1 and current value I are calculated the internal resistance value Rin of the monomer battery core of described correspondence, described control unit 23 control store unit 25 this internal resistance value of storage Rinx, obtain this monomer battery core 11 in memory cell from the internal resistance value Rin1-Rinx of the 1st time to the x time, reliable internal resistance value Rin_ave while calculating x balanced unlatching, judge whether this reliable internal resistance value Rin_ave exceeds preset value, if report to the police to assert this monomer electric core aging or damage, judge that if not this monomer battery core is normal.In this process, the magnitude of voltage of the interior some monomer battery cores 11 of cell apparatus 100 described in described control unit 23 continuous collecting, until the magnitude of voltage of the monomer battery core 11 that above-mentioned equalizing circuit 12 is opened recovers normal, controls corresponding equalizing circuit 12 and closes, and stops equilibrium.With reference to figure 5, if when the voltage of a certain monomer battery core 11 is less than other monomer battery cores, the magnitude of voltage that described control unit 23 collects according to voltage acquisition end 21 is exported secondary end switching tube Q2 described in a control signal control to level end switch pipe Q1 at the beginning of the equalizing circuit 12 of these monomer battery core 11 correspondences and is opened, the energy of energy bus 13 is by two-way transformer T1, backward this monomer battery core 11 of inductance L and capacitor C is charged, meanwhile, magnitude of voltage V0 before the equalizing circuit 12 of described control unit 23 these monomer battery cores 11 of acquisition is opened, current value I when magnitude of voltage V1 after unlatching preset time t 1 and equilibrium, judge whether described current value I is zero, if control the connecting line fault that alarm unit 24 is reported to the police and assert equalizing circuit 12 or monomer battery core 11, if not according to described magnitude of voltage V0, magnitude of voltage V1 and current value I are calculated the internal resistance value Rin of the monomer battery core of described correspondence, described control unit 23 control store unit 25 this internal resistance value of storage Rinx, obtain this monomer battery core 11 in memory cell from the internal resistance value Rin1～Rinx of the 1st time to the x time, reliable internal resistance value Rin_ave while calculating x balanced unlatching, judge whether this reliable internal resistance value Rin_ave exceeds preset value, if report to the police to assert this monomer electric core aging or damage, judge that if not this monomer battery core is normal.In this process, the magnitude of voltage of the interior some monomer battery cores 11 of cell apparatus 100 described in described control unit 23 continuous collecting, until the magnitude of voltage of the monomer battery core 11 that above-mentioned equalizing circuit 12 is opened recovers normal, controls corresponding equalizing circuit 12 and closes, and stops equilibrium.。
Compared with prior art, the present invention is after equalizing circuit 12 is opened, gather magnitude of voltage V0 before the unlatching of corresponding monomer battery core 11, magnitude of voltage V1 after opening and the current value I when balanced, thereby calculate the internal resistance value Rin of this monomer battery core, judge that with this whether this monomer battery core is normal, thereby in the time of this monomer electric core aging or damage, and alarm, notify user to change abnormal monomer battery core.On the other hand, the present invention only carries out internal resistance measurement to opening balanced monomer battery core 11, and other monomer battery cores are not carried out to internal resistance measurement, low in energy consumption, measures fast.Again on the one hand, the present invention carries out 11 internal resistances of monomer battery core and calculates in balanced, does not require that cell apparatus quits work, and saves time and resource.Again on the one hand, the present invention calculates the internal resistance value Rin of described monomer battery core by gathering magnitude of voltage V0, magnitude of voltage V1 and euqalizing current value I, without independent internal resistance detection module is set, make cell apparatus simple in structure, and stability is high, harmony good.
Above disclosed is only the preferred embodiments of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the present patent application the scope of the claims, still belongs to the scope that the present invention is contained.
Claims (10)
1. a battery battery core diagnostic method, for diagnosing the monomer battery core in cell apparatus, described cell apparatus comprises some monomer battery cores, equalizing circuit corresponding to some and described monomer battery core, it is characterized in that, described battery battery core diagnostic method comprises:
(1), in the time that arbitrarily equalizing circuit is opened, obtain magnitude of voltage V0 before the unlatching of the monomer battery core corresponding with the equalizing circuit of opening, current value I while opening magnitude of voltage V1 after Preset Time and equilibrium;
(2) foundation described magnitude of voltage V0, magnitude of voltage V1 and current value I are calculated the internal resistance value Rin of described monomer battery core, judge that according to described internal resistance value Rin whether described monomer battery core is normal, and at the abnormal alarm of described monomer battery core.
2. battery battery core diagnostic method as claimed in claim 1, is characterized in that, calculates the internal resistance value Rin of described monomer battery core in step (2) according to formula Rin=|V1-V0|/I.
3. battery battery core diagnostic method as claimed in claim 1, it is characterized in that, in described step (2), judge that according to internal resistance value Rin the whether normal method of described monomer battery core comprises: whether the internal resistance value Rin that judges described monomer battery core exceeds preset range, if report to the police, returns if not.
4. battery battery core diagnostic method as claimed in claim 1, is characterized in that, between described step (1) and step (2), also comprises: judge whether described euqalizing current value I is zero, if report to the police, carry out if not described step (2).
5. battery battery core diagnostic method as claimed in claim 1, is characterized in that, in described step (2), judges that according to internal resistance value Rin the whether normal method of described monomer battery core comprises: the resistance value Rin of monomer battery core described in when the each equilibrium of record, and pass through formula
Calculate the reliable internal resistance value Rin_ave from the 1st to m time balanced opening process generation of described monomer battery core, and judge that according to described reliable internal resistance value Rin_ave whether described monomer battery core is normal, wherein,
Internal resistance value when Rinx is the x time of described monomer battery core balanced unlatching, m is the last balanced numbering of opening of described monomer battery core, x=1,2,3 ... m.
6. a battery battery core diagnostic device, for diagnosing the monomer battery core in cell apparatus, described cell apparatus comprises some monomer battery cores, equalizing circuit corresponding to some and described monomer battery core, it is characterized in that, described battery battery core diagnostic device comprises:
The voltage acquisition end that some and described monomer battery core is corresponding, for gathering the voltage of corresponding described monomer battery core;
Current collection circuit corresponding to some and described monomer battery core, for gathering the electric current between corresponding described monomer battery core and equalizing circuit;
Control unit, in the time that equalizing circuit is opened arbitrarily, magnitude of voltage V1 and euqalizing current value I after magnitude of voltage V0, unlatching Preset Time before the unlatching of monomer battery core corresponding to equalizing circuit obtaining and open, calculate the internal resistance value Rin of the monomer battery core of described correspondence according to described magnitude of voltage V0, magnitude of voltage V1 and current value I, judge that according to described internal resistance value Rin whether described monomer battery core is normally to export corresponding diagnostic signal;
Alarm unit, reports to the police according to described diagnostic signal.
7. battery battery core diagnostic device as claimed in claim 6, is characterized in that, described control unit calculates the internal resistance value Rin of described monomer battery core according to formula Rin=|V1-V0|/I.
8. battery battery core diagnostic device as claimed in claim 6, it is characterized in that, described control unit judges that according to described internal resistance value Rin the whether normal method of described monomer battery core comprises: whether the internal resistance value Rin that judges described monomer battery core exceeds preset range, if export corresponding diagnostic signal, return if not.
9. battery battery core diagnostic device as claimed in claim 6, is characterized in that, described control unit also judges that whether described euqalizing current value I is zero, if send corresponding diagnostic signal, calculates described internal resistance value Rin if not before calculating described internal resistance value Rin.
10. battery battery core diagnostic device as claimed in claim 6, it is characterized in that, also comprise memory cell, described control unit judges that according to described internal resistance value Rin the whether normal method of described monomer battery core comprises: the resistance value Rin of monomer battery core described in while controlling the each equilibrium of described unit records, and pass through formula
Calculate the reliable internal resistance value Rin_ave from the 1st to M time balanced opening process generation of described monomer battery core, and whether the monomer battery core that judges described correspondence according to described reliable internal resistance value Rin_ave is normal, wherein,
Internal resistance value when Rinx is the x time of described monomer battery core balanced unlatching, x=1,2,3 ... m.
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| CN105652212A (en) * | 2016-02-05 | 2016-06-08 | 惠州市蓝微新源技术有限公司 | Method for dynamically detecting consistency of battery pack |
| CN106546924A (en) * | 2016-10-08 | 2017-03-29 | 浙江大学 | A kind of dynamic prediction method of automobile lithium battery performance |
| CN107187328A (en) * | 2017-05-17 | 2017-09-22 | 宁波普瑞均胜汽车电子有限公司 | Lithium ion battery management system and battery core monomer essential resistance on-line measurement diagnostic method |
| CN108196123A (en) * | 2017-12-27 | 2018-06-22 | 惠州亿纬锂能股份有限公司 | A kind of evaluation method of lithium ion battery cell internal resistance exception |
| CN110015176A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN113655396A (en) * | 2020-05-12 | 2021-11-16 | 比亚迪股份有限公司 | Method and system for diagnosing loop connection state of battery pack, management system and vehicle |
| CN116331060A (en) * | 2023-05-25 | 2023-06-27 | 苏州清研精准汽车科技有限公司 | Power battery, data measurement method thereof and vehicle |
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| CN110015176A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN108196123A (en) * | 2017-12-27 | 2018-06-22 | 惠州亿纬锂能股份有限公司 | A kind of evaluation method of lithium ion battery cell internal resistance exception |
| CN108196123B (en) * | 2017-12-27 | 2020-07-14 | 惠州亿纬锂能股份有限公司 | Method for judging abnormity of internal resistance of lithium ion battery cell |
| CN113655396A (en) * | 2020-05-12 | 2021-11-16 | 比亚迪股份有限公司 | Method and system for diagnosing loop connection state of battery pack, management system and vehicle |
| CN113655396B (en) * | 2020-05-12 | 2022-10-18 | 比亚迪股份有限公司 | Method and system for diagnosing connection state of power loop of battery pack and management system |
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| CN116331060B (en) * | 2023-05-25 | 2023-09-05 | 苏州清研精准汽车科技有限公司 | Power battery, data measurement method thereof and vehicle |
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