CN103545564B - Rechargeable battery cell and defect inspection method thereof - Google Patents
Rechargeable battery cell and defect inspection method thereof Download PDFInfo
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- CN103545564B CN103545564B CN201210246854.9A CN201210246854A CN103545564B CN 103545564 B CN103545564 B CN 103545564B CN 201210246854 A CN201210246854 A CN 201210246854A CN 103545564 B CN103545564 B CN 103545564B
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- rechargeable battery
- battery cell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Rechargeable battery cell and rechargeable battery cell defect inspection method, described rechargeable battery cell comprises: at least one rechargeable battery string, and the load configured when discharging to described rechargeable battery cell provides power supply; Battery management unit, contact with at least one rechargeable battery described and connect, wherein said battery management unit judges whether described rechargeable battery cell is in the first discharge condition; If described rechargeable battery cell is in the first discharge condition, then described battery management unit based on preset condition with the change in voltage of at least one rechargeable battery string described in very first time interval measurement; And if described change in voltage exceedes default first threshold, then described battery management unit judges that described rechargeable battery cell is abnormal.
Description
Technical field
The present invention relates to a kind of rechargeable battery cell and defect inspection method thereof.
Background technology
Current, the rechargeable battery of such as lithium ion battery and so on is widely used in the equipment such as mobile terminal, electric tool, electric automobile, energy-storage system.In the rechargeable battery of such as lithium ion battery and so on, the combustible liquid organic compound of general employing is (as ethylene carbonate, propene carbonate etc.) as its electrolyte solvent, when it is when storage power state (high-voltage charge state), the positive and negative electrode material of this kind of rechargeable battery has very strong chemical reactivity, therefore once there is special status, probably make, between battery material component, violent chemical reaction occurs, thus cause that battery is overheated, on fire even to explode.Rechargeable battery outside and Interior Inducement all may cause the generation of above-mentioned special status.Here, outside inducement is often referred to abuse, misoperation or uses lithium battery (e.g., overcharge not in accordance with requiring, external short circuit battery, hot environment use etc.), and the battery core internal short-circuit that Interior Inducement is a variety of causes to be caused (as, be mixed into impurity, pole piece burr, barrier film has flaw etc.).In the prior art; usually in the administrative unit of rechargeable battery, add one section, two segment protects, even additional protection device (e.g., Thermal Cutoffs has been installed all separately to the battery core of rechargeable battery; Breaker etc.), thus substantially avoid the battery security risk that outside inducement causes.But the manufacture craft of current rechargeable battery cannot choose all internal short-circuit battery cores, and particularly some defect battery core only just can expose in the continuous use of terminal use.Therefore, need in the administrative unit of rechargeable battery, arrange electric discharge and charging detecting mechanism, thus can just be screened at the defect battery core deterioration initial stage and stop using, thus effectively prevent the generation of pernicious security incident (on fire, blast).
Summary of the invention
In order to solve above-mentioned technical problem of the prior art, according to an aspect of the present invention, a kind of rechargeable battery cell is provided, is applied to terminal equipment, described rechargeable battery cell comprises: at least one rechargeable battery string, and the load configured when discharging to described rechargeable battery cell provides power supply; Battery management unit, contact with at least one rechargeable battery described and connect, wherein said battery management unit judges whether described rechargeable battery cell is in the first discharge condition; If described rechargeable battery cell is in the first discharge condition, then described battery management unit based on preset condition with the change in voltage of at least one rechargeable battery string described in very first time interval measurement; And if described change in voltage exceedes default first threshold, then described battery management unit judges that described rechargeable battery cell is abnormal.
In addition, according to one embodiment of present invention, wherein said default condition is that the voltage of at least one rechargeable battery string described is in the first interval; And if the voltage of at least one rechargeable battery string described is interval first, then battery management unit is with the change in voltage of at least one rechargeable battery string described in very first time interval measurement.
In addition, according to one embodiment of present invention, wherein under described first discharge condition, the discharging current of described rechargeable battery cell is less than 50mA.
In addition, according to one embodiment of present invention, wherein said first interval comprises 4 ~ 4.15V and 3.30 ~ 3.55V.
In addition, according to one embodiment of present invention, wherein when described rechargeable battery cell is connected with the adapter of described terminal equipment, described battery management unit indicates described adapter to charge to described rechargeable battery cell with the first charged state; Under described rechargeable battery cell is in the first charged state, then described battery management unit is with the change in voltage of at least one rechargeable battery string described in the second time interval measurement; And if described change in voltage is less than default Second Threshold, then described battery management unit judges to there is internal short-circuit in described rechargeable battery cell.
In addition, according to one embodiment of present invention, wherein under described first charged state, described in be supplied to described rechargeable battery cell charging current be less than 100mA.
In addition, according to one embodiment of present invention, wherein said battery management unit upgrades described first threshold and described Second Threshold based on the current corresponding relation of expiring between capacitance and specified full capacitance of described rechargeable battery cell.
In addition, according to a further aspect in the invention, a kind of rechargeable battery cell defect inspection method is provided, be applied to rechargeable battery cell, described rechargeable battery cell comprises at least one the rechargeable battery string providing power supply for the load when discharging to described rechargeable battery cell, and described defect inspection method comprises: judge whether described rechargeable battery cell is in the first discharge condition; If described rechargeable battery cell is in the first discharge condition, then based on preset condition with the change in voltage of at least one rechargeable battery string described in very first time interval measurement; And if described change in voltage exceedes default first threshold, then judge that described rechargeable battery cell is abnormal.
In addition, according to one embodiment of present invention, wherein said default condition is that the voltage of at least one rechargeable battery string described is in the first interval.
In addition, according to one embodiment of present invention, wherein under described first discharge condition, the discharging current of described rechargeable battery cell is less than 50mA.
In addition, according to one embodiment of present invention, wherein said first interval comprises 4 ~ 4.15V and 3.30 ~ 3.55V.
In addition, according to one embodiment of present invention, wherein said method comprises further: when described rechargeable battery cell is connected with adapter, indicates described adapter to charge to described rechargeable battery cell with the first charged state; Under described rechargeable battery cell is in the first charged state, with the change in voltage of at least one rechargeable battery string described in the second time interval measurement; And if described change in voltage is less than default Second Threshold, then judge to there is internal short-circuit in described rechargeable battery cell.
In addition, according to one embodiment of present invention, wherein under described first charged state, the charging current being supplied to described rechargeable battery cell is less than 100mA.
In addition, according to one embodiment of present invention, wherein described first threshold and described Second Threshold is upgraded based on the current corresponding relation of expiring between capacitance and specified full capacitance of described rechargeable battery cell.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of diagram according to the structure of the rechargeable battery of the embodiment of the present invention; And
Fig. 2 is the flow chart of diagram according to the rechargeable battery cell defect inspection method of the embodiment of the present invention.
Embodiment
Describe in detail with reference to the accompanying drawings according to each embodiment of the present invention.Here it is to be noted that it in the accompanying drawings, identical Reference numeral is given there is identical or similar structures and function part substantially, and the repeated description of will omit about them.
Below, with reference to Fig. 1, the rechargeable battery cell according to the embodiment of the present invention is described.Here, can be applied in the equipment of such as mobile terminal, electric tool, electric automobile, energy-storage system and so on according to the rechargeable battery of the embodiment of the present invention.
As shown in Figure 1, at least one rechargeable battery string 11 can be comprised according to the rechargeable battery cell 1 of the embodiment of the present invention.Rechargeable battery string 11 can be realized by the multiple chargeable battery core of any type, and the load when discharging to rechargeable battery cell 1 can provide power supply.Here, when the rechargeable battery string 11 in rechargeable battery cell 1 is more than one, multiple rechargeable battery string 11 serial or parallel connection can be had more jumbo rechargeable battery cell 1 to provide.
Battery management unit 12 can be realized by arbitrary microcontroller or module, and battery management unit 12 can be connected with at least one rechargeable battery string 11 and can detect voltage and the electric current of at least one rechargeable battery string 11.Such as, if comprise single rechargeable battery string 11 in rechargeable battery cell 1, then battery management unit 12 can measure the voltage at these rechargeable battery string 11 two ends.In addition, when comprising multiple rechargeable battery string 11 in rechargeable battery cell 1, if multiple rechargeable battery string 11 is in parallel, then rechargeable battery cell 1 can measure the voltage at the sys node two ends of rechargeable battery string 11, if and multiple rechargeable battery string 11 is connected, then rechargeable battery cell 1 can measure the voltage of multiple rechargeable battery string 11 two ends (both positive and negative polarity of rechargeable battery cell).
According to embodiments of the invention, battery management unit 12 can perform the process of rechargeable battery cell defects detection.
Particularly, battery management unit 12 can judge whether rechargeable battery cell 1 is in the first discharge condition.If rechargeable battery cell 1 is in the first discharge condition, then battery management unit 12 based on preset condition with the change in voltage of very first time interval measurement rechargeable battery string 11.
Here, the first discharge condition can be stable low discharging current state, and under the first discharge condition, the discharging current of rechargeable battery cell 1 is less than 50mA.Such as, first discharge condition can be the holding state of the terminal equipment that rechargeable battery cell 1 connects, sleep or off-mode, now basic keep constant due to the power consumption of terminal equipment very low (usual discharging current is less than 50mA), be therefore conducive to the change in voltage (voltage change ratio can not acutely change) detecting rechargeable battery string 11 in the unit interval.Now, whether battery management unit 12 can be in the first discharge condition by the discharging current determination rechargeable battery cell 1 of rechargeable battery cell 1.
In addition, the condition preset can be that the voltage of at least one rechargeable battery string 11 is in the first interval.In this case, if the voltage of at least one rechargeable battery string 11 is in the first interval, then battery management unit 12 is with the change in voltage of at least one rechargeable battery string 11 of very first time interval measurement.Particularly, when rechargeable battery cell 1 is the rechargeable battery of such as mobile phone or panel computer, the first interval can comprise the scope of 4 ~ 4.15V and 3.30 ~ 3.55V.Here, due in the scope of 4 ~ 4.15V and 3.30 ~ 3.55V, the voltage of at least one rechargeable battery string 11 described is larger with the rate of change of the change of at least one rechargeable battery string 11 electricity described, and under the first discharge condition of rechargeable battery cell 1, the rate of change of the voltage of at least one rechargeable battery string 11 is stable substantially, therefore selects 4 ~ 4.15V and 3.30 ~ 3.55V to be conducive to the change in voltage of rechargeable battery string 11 in the unit interval and specific threshold value to compare as the first interval.
In addition, the present invention is not limited thereto, because the purposes of different types of rechargeable battery cell 1 may be different, and the characteristic area of the rated output voltage of itself and the output voltage change when rechargeable battery cell 1 discharges also may be different, therefore 4 ~ 4.15V of describing before being not limited to of the first interval and 3.30 ~ 3.55V.Here, the characteristic area of the output voltage change when rechargeable battery cell 1 discharges can be selected to be used as first area.
In addition, such as, very first time interval can be 30 minutes.In addition, the present invention is not limited thereto, as long as when rechargeable battery cell 1 is with the first discharge condition electric discharge, very first time interval can make the voltage of at least one rechargeable battery string 11 that certain change occurs, and other the time interval can also be adopted as very first time interval.
In this case, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 exceedes default first threshold, then battery management unit 12 judges that rechargeable battery cell 1 is abnormal.
Particularly, the first threshold preset can be the value being greater than the change in voltage of at least one rechargeable battery string 11 on very first time interval when normal rechargeable battery cell 1 discharges with the first discharge condition.Here, suppose that the change in voltage when at least one rechargeable battery string normal discharges with the first discharge condition on very first time interval is △ V1, then the first threshold preset can be greater than △ V1.According to one embodiment of present invention, first threshold Vref1 can be 1.5 times of △ V1.Here, the reason being set to first threshold Vref1 be greater than △ V1 is: if the specific rechargeable battery string at least one rechargeable battery string 11 there occurs internal short-circuit, then when rechargeable battery cell 1 discharges with the first discharge condition, the change in voltage of at least one rechargeable battery string (single or connection in series-parallel) 11 can be greater than normal change in voltage.Therefore, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 exceedes first threshold, then battery management unit 12 judges that rechargeable battery cell 1 is abnormal.
In addition, rechargeable battery cell 1 can also comprise memory cell or can arrange memory cell to store first threshold at battery management unit 12.Here, because dissimilar rechargeable battery cell 1 may have different characteristics, the value of the change in voltage of at least one rechargeable battery string 11 on very first time interval when normal rechargeable battery cell 1 discharges with the first discharge condition therefore can be obtained here by the mode of great many of experiments.Such as, rechargeable battery cell 1 can be obtained with multiple voltage changes of at least one rechargeable battery string during different discharging currents electric discharge very first time interval, and the plurality of voltage change is multiplied by predetermined coefficient to obtain different first thresholds.In this case, when the change in voltage of at least one rechargeable battery string 11 and first threshold compare by battery management unit 12, battery management unit 12 can select corresponding first threshold to improve the defects detection precision of rechargeable battery cell 1 further based on the discharge condition of rechargeable battery cell 1 (e.g., discharging current).
When battery management unit 12 judges that rechargeable battery cell 1 is abnormal, battery management unit 12 can send directly to connected terminal equipment the information representing rechargeable battery cell 1 exception, or battery management unit 12 can also judge that whether rechargeable battery cell 1 is abnormal further.
Particularly, when rechargeable battery cell 1 is connected with the adapter (not shown) of terminal equipment, battery management unit 12 can charge 1 with the first charged state to rechargeable battery cell by indication adapter.Here, similarly to the prior art, when rechargeable battery cell 1 is connected with the adapter of terminal equipment, battery management unit 12 can send the information relevant to charging current to terminal equipment, and terminal equipment can control adapter based on this information, and the charging current making adapter provide with battery management unit 12 is charged to rechargeable battery cell 1.Here, the first charged state can be low current charge state.Here, under low current charge state, the charging current being supplied to rechargeable battery cell 1 from adapter can be less than 100mA.With the small area analysis being such as less than 100mA rechargeable battery cell 1 charged and be conducive to detecting the change in voltage (voltage change ratio can not acutely change) of rechargeable battery string 11 in the unit interval.
Under rechargeable battery cell 1 is in the first charged state, battery management unit 12 can with the change in voltage of at least one rechargeable battery string 11 of the second time interval measurement.If this change in voltage is less than default Second Threshold, then battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string.Here, second time interval also can be 30 minutes.In addition, the present invention is not limited thereto, as long as at rechargeable battery cell 1 under the first charged state, second time interval can make the voltage of at least one rechargeable battery string 11 that certain change occurs, and other the time interval can also be adopted as second time interval.In addition, due to usual under the first charged state of rechargeable battery cell 1, on the unit interval, the change in voltage of at least one rechargeable battery string 11 substantially can be considered for linearly in most of voltage range, therefore except being in except the interval near complete power consumption at rechargeable battery cell 1, the change in voltage of at least one rechargeable battery string 11 can be measured on any voltage range.
In this case, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 is less than default Second Threshold, then battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string.Particularly, the Second Threshold preset can be the value being less than the change in voltage of at least one rechargeable battery string on second time interval when normal rechargeable battery cell 1 charges with the first charged state.Here, suppose that the change in voltage when at least one rechargeable battery string normal charges with the first charged state on second time interval is Δ V2, then the Second Threshold preset can be less than Δ V2.According to one embodiment of present invention, first threshold Vref2 can be 0.8 times of Δ V2.Here, the reason being set to Second Threshold Vref2 to be less than Δ V2 is: if the specific rechargeable battery string at least one rechargeable battery string 11 there occurs internal short-circuit, then when rechargeable battery cell 1 charges with the first charged state, the change in voltage of at least one rechargeable battery string (single or connection in series-parallel) 11 can be less than normal change in voltage.Therefore, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 is less than Second Threshold, then battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string.
In this case, when battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string 11, battery management unit 12 can send to connected terminal equipment the information that there is internal short-circuit at least one the rechargeable battery string 11 represented in rechargeable battery cell 1.
Here, when rechargeable battery cell 1 is in the first discharge condition, battery management unit 12 can repeatedly based on the condition preset with the change in voltage of at least one rechargeable battery string of very first time interval measurement, and compare obtained repeatedly change in voltage and first threshold to reduce the possible of the mistake occurred because single compares.Similarly, when rechargeable battery cell 1 is in the first charged state, obtained repeatedly change in voltage and Second Threshold repeatedly with the change in voltage of at least one rechargeable battery string of the second time interval measurement, and can be compared the possibility reducing the mistake occurred because single compares by battery management unit 12.
In addition, according to another embodiment of the invention, battery management unit 12 can also upgrade first threshold and Second Threshold based on the corresponding relation between the current full capacitance of rechargeable battery cell 1 and specified full capacitance.
Here, because its capacity of continuous use along with rechargeable battery cell 1 constantly reduces, therefore when rechargeable battery cell 1 is in the first discharge condition, the change in voltage of at least one rechargeable battery string 11 on the unit interval can constantly increase, namely, when the continuous electric discharge of rechargeable battery 1, the change in voltage of at least one the rechargeable battery string 11 on the unit interval (decline) in the rechargeable battery cell 1 that capacity reduces can become large.In addition, when rechargeable battery cell 1 is in the first charged state, the change in voltage of at least one rechargeable battery string 11 on the unit interval can also can constantly increase, namely, when rechargeable battery 1 charges, the change in voltage of at least one the rechargeable battery string 11 on the unit interval (rising) in the rechargeable battery cell 1 that capacity reduces can become large
Based on above-mentioned situation, can based on the current capacities of rechargeable battery cell 1 and its rated capacity correction first threshold and Second Threshold.Here, the current capacities of rechargeable battery cell 1 can be obtained based on arbitrary cubic content measurement technology.
Here, suppose that the current capacities of rechargeable battery cell 1 is C
current, the rated capacity of rechargeable battery cell 1 is C
rated, and Δ V1 is the change in voltage when at least one rechargeable battery string normal discharges with the first discharge condition on very first time interval.
In this case, the change in voltage Δ V1 ' when using at least one the rechargeable battery string 11 in rechargeable battery cell 1 after a while to discharge with the first discharge condition on very first time interval can become:
In this case, battery management unit 12 upgrades first threshold based on the new change in voltage Δ V1 ' obtained and stores first threshold, thus further increases accuracy of detection.
Similarly, the change in voltage Δ V2 ' when using at least one the rechargeable battery string 11 in rechargeable battery cell 1 after a while to charge with the first charged state on second time interval can become:
In this case, battery management unit 12 upgrades Second Threshold based on the new change in voltage Δ V2 ' obtained and stores Second Threshold, thus can improve accuracy of detection further.
By the way, can by detect rechargeable battery cell 1 discharge and/or charging time this rechargeable battery cell 1 in the change in voltage of at least one rechargeable battery string 11, and this change in voltage and predetermined threshold value compared determine whether rechargeable battery cell 1 exists exception (internal short-circuit).Determining whether rechargeable battery cell 1 is deposited in an exceptional case, the user of terminal equipment can take out this rechargeable battery cell 1 to avoid the generation of potential accident.
Below, with reference to Fig. 2, the rechargeable battery cell defect inspection method according to the embodiment of the present invention is described.The method of Fig. 2 can be applied to the rechargeable battery cell shown in Fig. 1.Here, rechargeable battery cell comprises at least one the rechargeable battery string providing power supply for the load when discharging to rechargeable battery cell.
As shown in Figure 2, in step S201, judge whether rechargeable battery cell is in the first discharge condition.
Particularly, battery management unit 12 can judge whether rechargeable battery cell 1 is in the first discharge condition.Here, the first discharge condition is stable low discharging current state, and under the first discharge condition, the discharging current of rechargeable battery cell 1 is less than 50mA.Such as, first discharge condition can be the holding state of the terminal equipment that rechargeable battery cell 1 connects, sleep or off-mode, now basic keep constant due to the power consumption of terminal equipment very low (usual discharging current is less than 50mA), be therefore conducive to the change in voltage (voltage change ratio can not acutely change) detecting rechargeable battery string 11 in the unit interval.Now, whether battery management unit 12 can be in the first discharge condition by the discharging current determination rechargeable battery cell 1 of rechargeable battery cell 1.
Then, in step S202, if rechargeable battery cell is in the first discharge condition, then based on preset condition with the change in voltage of at least one rechargeable battery string of very first time interval measurement.
Particularly, if battery management unit 12 determines that rechargeable battery cell 1 is in the first discharge condition, then battery management unit 12 based on preset condition with the change in voltage of very first time interval measurement rechargeable battery string 11.Here, the condition preset can be that the voltage of at least one rechargeable battery string 11 is in the first interval.In this case, if the voltage of at least one rechargeable battery string 11 is in the first interval, then battery management unit 12 is with the change in voltage of at least one rechargeable battery string 11 of very first time interval measurement.Particularly, when rechargeable battery cell 1 is the rechargeable battery of such as mobile phone or panel computer, the first interval can comprise the scope of 4 ~ 4.15V and 3.30 ~ 3.55V.Here, due in the scope of 4 ~ 4.15V and 3.30 ~ 3.55V, the voltage of at least one rechargeable battery string 11 described is larger with the rate of change of the change of at least one rechargeable battery string 11 electricity described, and under the first discharge condition of rechargeable battery cell 1, the rate of change of the voltage of at least one rechargeable battery string 11 is stable substantially, therefore selects 4 ~ 4.15V and 3.30 ~ 3.55V to be conducive to the change in voltage of rechargeable battery string 11 in the unit interval and specific threshold value to compare as the first interval.In addition, the present invention is not limited thereto, because the purposes of different types of rechargeable battery cell 1 may be different, and the characteristic area of the rated output voltage of itself and the output voltage change when rechargeable battery cell 1 discharges also may be different, therefore 4 ~ 4.15V of describing before being not limited to of the first interval and 3.30 ~ 3.55V.Here, any characteristic area of the output voltage change when rechargeable battery cell 1 discharges can be selected to be used as first area.In addition, very first time interval can be 30 minutes.In addition, as long as when rechargeable battery cell 1 is with the first discharge condition electric discharge, very first time interval can make the voltage of at least one rechargeable battery string 11 that certain change occurs, and other the time interval can also be adopted as very first time interval.
In step S203, if change in voltage exceedes default first threshold, then judge that rechargeable battery cell is abnormal.
Particularly, battery management unit 12 judges whether the change in voltage of at least one rechargeable battery string 11 exceedes default first threshold.If battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 exceedes default first threshold, then battery management unit 12 judges that rechargeable battery cell 1 is abnormal.Here, the first threshold preset can be the value being greater than the change in voltage of at least one rechargeable battery string 11 on very first time interval when normal rechargeable battery cell 1 discharges with the first discharge condition.Here, suppose that the change in voltage when at least one rechargeable battery string 11 normal discharges with the first discharge condition on very first time interval is Δ V1, then the first threshold preset can be greater than Δ V1.According to one embodiment of present invention, first threshold Vref1 can be 1.5 times of Δ V1.Here, the reason being set to first threshold Vref1 be greater than Δ V1 is: if the specific rechargeable battery string at least one rechargeable battery string 11 there occurs internal short-circuit, then when rechargeable battery cell 1 discharges with the first discharge condition, the change in voltage of at least one rechargeable battery string (single or connection in series-parallel) 11 can be greater than normal change in voltage.Therefore, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 exceedes first threshold, then battery management unit 12 judges that rechargeable battery cell 1 is abnormal.In addition, first threshold can also be stored in rechargeable battery cell 1.Here, because dissimilar rechargeable battery cell 1 may have different characteristics, the value of the change in voltage of at least one rechargeable battery string 11 on very first time interval when normal rechargeable battery cell 1 discharges with the first discharge condition therefore can be obtained here by the mode of great many of experiments.Such as, rechargeable battery cell 1 can be obtained with multiple voltage changes of at least one rechargeable battery string during different discharging currents electric discharge very first time interval, and the plurality of voltage change is multiplied by predetermined coefficient to obtain different first thresholds.In this case, when the change in voltage of at least one rechargeable battery string 11 and first threshold compare by battery management unit 12, battery management unit 12 can select corresponding first threshold to improve the defects detection precision of rechargeable battery cell 1 further based on the discharge condition of rechargeable battery cell 1 (e.g., discharging current).
In addition, according to another embodiment of the invention, the method for Fig. 2 can further include step: when rechargeable battery cell is connected with adapter, and indication adapter charges to rechargeable battery cell with the first charged state; Under rechargeable battery cell is in the first charged state, with the change in voltage of at least one rechargeable battery string of the second time interval measurement; And if change in voltage is less than default Second Threshold, then judge to there is internal short-circuit at least one rechargeable battery string.
Particularly, when rechargeable battery cell 1 is connected with the adapter (not shown) of terminal equipment, battery management unit 12 can charge to rechargeable battery cell 1 with the first charged state by indication adapter.Here, the first charged state can be low current charge state.Under low current charge state, the charging current being supplied to rechargeable battery cell 1 from adapter can be less than 100mA.With the small area analysis being such as less than 100mA rechargeable battery cell 1 charged and be conducive to detecting the change in voltage (voltage change ratio can not acutely change) of rechargeable battery string 11 in the unit interval.
Under rechargeable battery cell 1 is in the first charged state, battery management unit 12 is with the change in voltage of at least one rechargeable battery string 11 of the second time interval measurement.If this change in voltage is less than default Second Threshold, then battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string.Such as, second time interval also can be 30 minutes.In addition, the present invention is not limited thereto, as long as at rechargeable battery cell 1 under the first charged state, second time interval can make the voltage of at least one rechargeable battery string 11 that certain change occurs, and other the time interval can also be adopted as second time interval.In addition, due to usual under the first charged state of rechargeable battery cell 1, on the unit interval, the change in voltage of at least one rechargeable battery string 11 is linear substantially in most of voltage range, therefore except being in except the interval near complete power consumption at rechargeable battery cell 1, the change in voltage of at least one rechargeable battery string 11 can be measured on any voltage range.
In this case, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 is less than default Second Threshold, then battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string.Particularly, the Second Threshold preset can be the value being less than the change in voltage of at least one rechargeable battery string on second time interval when normal rechargeable battery cell 1 charges with the first charged state.Here, suppose that the change in voltage when at least one rechargeable battery string normal charges with the first charged state on second time interval is Δ V2, then the Second Threshold preset can be less than Δ V2.According to one embodiment of present invention, Second Threshold Vref2 can be 0.8 times of Δ V2.Here, the reason being set to Second Threshold Vref2 to be less than Δ V2 is: if the specific rechargeable battery string at least one rechargeable battery string 11 there occurs internal short-circuit, then when rechargeable battery cell 1 charges with the first charged state, the change in voltage of at least one rechargeable battery string (single or connection in series-parallel) 11 can be less than normal change in voltage.Therefore, if battery management unit 12 determines that the change in voltage of at least one rechargeable battery string 11 is less than Second Threshold, then battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string.In addition, Second Threshold can also be stored in rechargeable battery cell 1.Because dissimilar rechargeable battery cell 1 may have different characteristics, the value of the change in voltage of at least one rechargeable battery string 11 on second time interval when normal rechargeable battery cell 1 charges with the first charged state therefore can be obtained here by the mode of great many of experiments.Such as, rechargeable battery cell 1 can be obtained with multiple voltage changes of at least one rechargeable battery string during different second time intervals of charging current for charging, and the plurality of voltage change is multiplied by predetermined coefficient to obtain different Second Thresholds.In this case, when the change in voltage of at least one rechargeable battery string 11 and Second Threshold compare by battery management unit 12, battery management unit 12 can select corresponding first threshold to improve the defects detection precision of rechargeable battery cell 1 further based on the charged state of rechargeable battery cell 1 (e.g., charging current).
In this case, when battery management unit 12 judges to there is internal short-circuit at least one rechargeable battery string 11, battery management unit 12 can send to connected terminal equipment the information that there is internal short-circuit at least one the rechargeable battery string 11 represented in rechargeable battery cell 1.
In addition, according to another embodiment of the invention, the method shown in Fig. 2 can further include step: the current corresponding relation of expiring between capacitance and specified full capacitance based on rechargeable battery cell upgrades first threshold and Second Threshold.
Particularly, battery management unit 12 also upgrades first threshold and Second Threshold based on the current corresponding relation of expiring between capacitance and specified full capacitance of rechargeable battery cell 1.Here, because its capacity of continuous use along with rechargeable battery cell 1 constantly reduces, therefore when rechargeable battery cell 1 is in the first discharge condition, the change in voltage of at least one rechargeable battery string 11 on the unit interval can constantly increase, namely, when the continuous electric discharge of rechargeable battery 1, the change in voltage of at least one the rechargeable battery string 11 on the unit interval (decline) in the rechargeable battery cell 1 that capacity reduces can become large.In addition, when rechargeable battery cell 1 is in the first charged state, the change in voltage of at least one rechargeable battery string 11 on the unit interval can also can constantly increase, namely, when rechargeable battery 1 charges, the change in voltage of at least one the rechargeable battery string 11 on the unit interval (rising) in the rechargeable battery cell 1 that capacity reduces can become large.Based on above-mentioned situation, battery management unit 12 is based on the current capacities of rechargeable battery cell 1 and its rated capacity correction first threshold and Second Threshold.It should be noted that the current capacities that can obtain rechargeable battery cell 1 based on arbitrary cubic content measurement technology.Here, suppose that the current capacities of rechargeable battery cell 1 is C
current, the rated capacity of rechargeable battery cell 1 is C
rated, and Δ V1 is the change in voltage when at least one rechargeable battery string normal discharges with the first discharge condition on very first time interval.
In this case, the change in voltage Δ V1 ' when using at least one the rechargeable battery string 11 in rechargeable battery cell 1 after a while to discharge with the first discharge condition on very first time interval can become:
In this case, battery management unit 12 upgrades first threshold based on the new change in voltage Δ V1 ' obtained and stores first threshold, thus further increases accuracy of detection.
Similarly, the change in voltage Δ V2 ' when using at least one the rechargeable battery string 11 in rechargeable battery cell 1 after a while to charge with the first charged state on second time interval can become:
In this case, battery management unit 12 upgrades Second Threshold based on the new change in voltage Δ V2 ' obtained and stores Second Threshold, thus can improve accuracy of detection further.
Each embodiment of the present invention is described in detail above.But, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, various amendment can be carried out to these embodiments, combination or sub-portfolio, and such amendment should fall within the scope of the present invention.
Claims (14)
1. a rechargeable battery cell, is applied to terminal equipment, and described rechargeable battery cell comprises:
At least one rechargeable battery string, the load be configured to when discharging to described rechargeable battery cell provides power supply;
Battery management unit, contacts with at least one rechargeable battery described and connects,
Wherein said battery management unit judges whether described rechargeable battery cell is in the first discharge condition;
If described rechargeable battery cell is in the first discharge condition, then described battery management unit based on preset condition with the change in voltage of at least one rechargeable battery string described in very first time interval measurement; And
If described change in voltage exceedes default first threshold, then described battery management unit judges that described rechargeable battery cell is abnormal.
2. rechargeable battery cell as claimed in claim 1, wherein
Described default condition is that the voltage of at least one rechargeable battery string described is interval first; And
If the voltage of at least one rechargeable battery string described is interval first, then battery management unit is with the change in voltage of at least one rechargeable battery string described in very first time interval measurement.
3. rechargeable battery cell as claimed in claim 2, wherein
Under described first discharge condition, the discharging current of described rechargeable battery cell is less than 50mA.
4. rechargeable battery cell as claimed in claim 2, wherein
Described first interval comprises 4 ~ 4.15V and 3.30 ~ 3.55V.
5. rechargeable battery cell as claimed in claim 1, wherein
When described rechargeable battery cell is connected with the adapter of described terminal equipment, described battery management unit indicates described adapter to charge to described rechargeable battery cell with the first charged state;
Under described rechargeable battery cell is in the first charged state, then described battery management unit is with the change in voltage of at least one rechargeable battery string described in the second time interval measurement; And
If described change in voltage is less than default Second Threshold, then described battery management unit judges to there is internal short-circuit at least one rechargeable battery string described.
6. rechargeable battery cell as claimed in claim 5, wherein
Under described first charged state, the charging current being supplied to described rechargeable battery cell is less than 100mA.
7. rechargeable battery cell as claimed in claim 5, wherein
Described battery management unit upgrades described first threshold and described Second Threshold based on the current corresponding relation of expiring between capacitance and specified full capacitance of described rechargeable battery cell.
8. a rechargeable battery cell defect inspection method, is applied to rechargeable battery cell, and described rechargeable battery cell comprises at least one the rechargeable battery string providing power supply for the load when discharging to described rechargeable battery cell, and described defect inspection method comprises:
Judge whether described rechargeable battery cell is in the first discharge condition;
If described rechargeable battery cell is in the first discharge condition, then based on preset condition with the change in voltage of at least one rechargeable battery string described in very first time interval measurement; And
If described change in voltage exceedes default first threshold, then judge that described rechargeable battery cell is abnormal.
9. method as claimed in claim 8, wherein
Described default condition is that the voltage of at least one rechargeable battery string described is interval first.
10. method as claimed in claim 9, wherein
Under described first discharge condition, the discharging current of described rechargeable battery cell is less than 50mA.
11. methods as claimed in claim 9, wherein
Described first interval comprises 4 ~ 4.15V and 3.30 ~ 3.55V.
12. methods as claimed in claim 8, comprise further:
When described rechargeable battery cell is connected with adapter, described adapter is indicated to charge to described rechargeable battery cell with the first charged state;
Under described rechargeable battery cell is in the first charged state, with the change in voltage of at least one rechargeable battery string described in the second time interval measurement; And
If described change in voltage is less than default Second Threshold, then judge to there is internal short-circuit at least one rechargeable battery string described.
13. methods as claimed in claim 12, wherein
Under described first charged state, the charging current being supplied to described rechargeable battery cell is less than 100mA.
14. methods as claimed in claim 13, comprise further:
Current corresponding relation of expiring between capacitance and specified full capacitance based on described rechargeable battery cell upgrades described first threshold and described Second Threshold.
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790341B (en) * | 2014-12-22 | 2018-03-06 | 炬芯（珠海）科技有限公司 | A kind of method and circuit for detecting battery |
| JP5927623B1 (en) * | 2015-02-03 | 2016-06-01 | 株式会社ジェイ・イー・ティ | Power storage device manufacturing method, structure inspection device |
| CN106054083B (en) * | 2016-06-27 | 2019-04-05 | 北京新能源汽车股份有限公司 | A kind of method for safety monitoring and device of electrokinetic cell system |
| WO2018000437A1 (en) * | 2016-07-01 | 2018-01-04 | 深圳市大疆创新科技有限公司 | Metal battery, and battery management system and control method therefor |
| CN106356574B (en) * | 2016-09-23 | 2019-03-05 | 北京新能源汽车股份有限公司 | A kind of capacity matching method and device |
| CN107064803B (en) * | 2016-12-16 | 2019-12-13 | 蔚来汽车有限公司 | on-line detection method for short circuit in battery |
| WO2019037108A1 (en) * | 2017-08-25 | 2019-02-28 | 深圳市云中飞网络科技有限公司 | Terminal device, adapter, battery safety monitoring method and monitoring system |
| CN109861351A (en) * | 2017-11-30 | 2019-06-07 | 南京德朔实业有限公司 | Adapter and portable power source system |
| CN110850304B (en) * | 2018-07-27 | 2022-05-31 | 中移物联网有限公司 | Full charge detection method and device and storage medium |
| CN109901004B (en) * | 2019-02-20 | 2021-02-23 | 北京航空航天大学 | Method and system for detecting short circuit in vehicle-mounted power battery |
| CN111856316B (en) * | 2019-04-02 | 2021-10-26 | 华为技术有限公司 | Method for detecting short circuit in battery pack, related device and electric vehicle |
| CN110247454B (en) * | 2019-06-26 | 2021-10-22 | 联想(北京)有限公司 | Processing method and electronic equipment |
| CN111551860B (en) * | 2020-05-26 | 2021-03-26 | 同济大学 | Battery internal short circuit diagnosis method based on relaxation voltage characteristics |
| CN113866669B (en) | 2020-06-30 | 2023-09-15 | 宁德时代新能源科技股份有限公司 | Method, device, equipment and medium for detecting internal short circuit fault of battery cell |
| CN113922494A (en) * | 2021-12-14 | 2022-01-11 | 广东电网有限责任公司佛山供电局 | Intelligent controller for detecting state of distribution network direct current screen and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1031301A (en) * | 1987-07-07 | 1989-02-22 | 菲利浦光灯制造公司 | Battery-powered equipment |
| CN101331659A (en) * | 2005-12-15 | 2008-12-24 | Nxp股份有限公司 | Battery recharge prevention principle for short battery voltage dips |
| CN102576057A (en) * | 2010-05-25 | 2012-07-11 | 松下电器产业株式会社 | Excess current detecting circuit and battery pack |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10223557A1 (en) * | 2002-05-28 | 2003-12-18 | Braun Gmbh | Procedure for maintaining a rechargeable battery |
-
2012
- 2012-07-16 CN CN201210246854.9A patent/CN103545564B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1031301A (en) * | 1987-07-07 | 1989-02-22 | 菲利浦光灯制造公司 | Battery-powered equipment |
| CN101331659A (en) * | 2005-12-15 | 2008-12-24 | Nxp股份有限公司 | Battery recharge prevention principle for short battery voltage dips |
| CN102576057A (en) * | 2010-05-25 | 2012-07-11 | 松下电器产业株式会社 | Excess current detecting circuit and battery pack |
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