CN104698253A - Determination method of lithium battery open circuit voltage - Google Patents
Determination method of lithium battery open circuit voltage Download PDFInfo
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- CN104698253A CN104698253A CN201510112510.2A CN201510112510A CN104698253A CN 104698253 A CN104698253 A CN 104698253A CN 201510112510 A CN201510112510 A CN 201510112510A CN 104698253 A CN104698253 A CN 104698253A
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- circuit voltage
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- battery open
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Abstract
The invention relates to a determination method of lithium battery open circuit voltage. The determination method of the lithium battery open circuit voltage includes following steps: step 1, fully charging a battery to be measured; step 2, placing the fully charged battery to be measured under a preset environment temperature for a preset time; step 3, using a first constant current to discharge the battery to be measured after the battery to be measured is placed for the preset time, and recording a discharge voltage curve; step 4, using a second constant current to discharge the battery to be measured and after being discharged, and recording a charge voltage curve; step 5, drawing a battery open circuit voltage curve according to the discharge voltage curve and the charge voltage curve of the battery to be measured and intermediate values of all points on the discharge voltage curve and the charge voltage curve, and then obtaining an open circuit voltage value of the battery to be measured under the preset environment temperature. The determination method of the lithium battery open circuit voltage can simply and accurately measure the open circuit voltage of the lithium battery.
Description
Technical field
The present invention relates to a kind of lithium battery field of measuring technique, particularly a kind of assay method of lithium battery open-circuit voltage.
Background technology
The open-circuit voltage of lithium battery, the i.e. terminal voltage of battery under open-circuit condition, it is generally acknowledged battery after charge or discharge through leaving standstill for a long time, battery has been eliminated polarization impact and has been reached steady state (SS), the voltage at battery in this time two ends is open-circuit voltage, open-circuit voltage does not affect by charging and discharging currents, relevant with battery material and state-of-charge.At a certain temperature, the state-of-charge of lithium battery presents corresponding relation with open-circuit voltage.If the relation obtaining open-circuit voltage and state-of-charge can be measured in advance, just obtain the current state-of-charge of battery by measuring the open-circuit voltage of battery when practical application, namely battery remaining power number.
The assay method of current lithium battery open-circuit voltage, mainly by measuring the open-circuit voltage under known state-of-charge, and then obtains the relation of open-circuit voltage and state-of-charge.Open-circuit voltage due to battery needs leaving standstill through the long period after battery charge or discharge complete, and the shortcoming of the method all needs to leave standstill battery under often measuring a known state-of-charge, and whole test process elapsed time is long.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of simple accurate method measuring lithium battery open-circuit voltage.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of assay method of lithium battery open-circuit voltage, comprises the following steps:
Step 1: mesuring battary is full of electricity;
Step 2: the mesuring battary being full of electricity is shelved Preset Time under default environment temperature;
Step 3: will the mesuring battary after Preset Time be shelved with the first steady current electric discharge preset, record discharge voltage profile;
Step 4: by the mesuring battary after electric discharge with the second constant current charge preset, record charging voltage curve;
Step 5: according to discharge voltage profile and the charging voltage curve of mesuring battary, the intermediate value according to each point in discharge voltage profile and charging voltage curve draws battery open circuit voltage curve, and then obtains the open-circuit voltage values of mesuring battary under default environment temperature.
The invention has the beneficial effects as follows: the present invention utilizes the principle that battery polarization is little when charging and discharging currents is less, namely the less operating voltage of electric current and open-circuit voltage more close, discharge process is more consistent with charging process internal resistance simultaneously, and thus battery open circuit voltage values can be equivalent to the intermediate value of sparking voltage and charging voltage.The method can obtain open-circuit voltage by simple charge and discharge process, and the open-circuit voltage values that the method obtains is continuous print, data are more accurate, overcome in conventional method and need the long-time shortcoming leaving standstill and can only get some points and carry out measuring, the inventive method is simple, test process elapsed time is short, and degree of accuracy is high, can apply.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the default environment temperature in described step 2 is-20 ~ 60 DEG C.
Further, described default environment temperature is-10 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C or 60 DEG C.
Further, the Preset Time in described step 2 is 8 ~ 24 hours.
Further, the pre-set constant current in described step 3 is 0.1C ~ 3C.
Further, described pre-set constant current is 0.1C, 0.2C, 0.3C, 0.5C, 0.8C, 1C, 2C or 3C.
Further, the second continuous current in described step 4 is identical with the described first steady current size in step 3.
Accompanying drawing explanation
Fig. 1 is the inventive method process flow diagram.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
As shown in Figure 1, a kind of assay method of lithium battery open-circuit voltage, comprises the following steps:
Step 1: mesuring battary is full of electricity;
Step 2: the mesuring battary being full of electricity is shelved Preset Time under default environment temperature;
Step 3: will the mesuring battary after Preset Time be shelved with the first steady current electric discharge preset, record discharge voltage profile;
Step 4: by the mesuring battary after electric discharge with the second constant current charge preset, record charging voltage curve;
Step 5: according to discharge voltage profile and the charging voltage curve of mesuring battary, the intermediate value according to each point in discharge voltage profile and charging voltage curve draws battery open circuit voltage curve, and then obtains the open-circuit voltage values of mesuring battary under default environment temperature.
Default environment temperature in described step 2 is-20 DEG C.
Preset Time in described step 2 is 8 hours.Pre-set constant current in described step 3 is 0.1C.
The second continuous current in described step 4 is identical with the described first steady current size in step 3.
The present invention utilizes the principle that battery polarization is little when charging and discharging currents is less, namely the less operating voltage of electric current and open-circuit voltage more close, discharge process is more consistent with charging process internal resistance simultaneously, and thus battery open circuit voltage values can be equivalent to the intermediate value of sparking voltage and charging voltage.The method can obtain open-circuit voltage by simple charge and discharge process, and the open-circuit voltage values that the method obtains is continuous print, data are more accurate, overcome in conventional method and need the long-time shortcoming leaving standstill and can only get some points and carry out measuring, the inventive method is simple, test process elapsed time is short, and degree of accuracy is high, can apply.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1, and the default environment temperature in described step 2 is 60 DEG C.Preset Time in described step 2 is 14 hours.Pre-set constant current in described step 3 is 3C.
Embodiment 3
Embodiment 3 is with the difference of embodiment 2 and 1, and the default environment temperature in described step 2 is 20 DEG C, and the Preset Time in described step 2 is 12 hours.Pre-set constant current in described step 3 is 1C.
Embodiment 4
Embodiment 4 is with the difference of embodiment 1,2 and 3, and described default environment temperature is 30 DEG C.Preset Time in described step 2 is 16 hours.Pre-set constant current in described step 3 is 2C.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an assay method for lithium battery open-circuit voltage, is characterized in that, comprises the following steps:
Step 1: mesuring battary is full of electricity;
Step 2: the mesuring battary being full of electricity is shelved Preset Time under default environment temperature;
Step 3: will the mesuring battary after Preset Time be shelved with the first steady current electric discharge preset, record discharge voltage profile;
Step 4: by the mesuring battary after electric discharge with the second constant current charge preset, record charging voltage curve;
Step 5: according to discharge voltage profile and the charging voltage curve of mesuring battary, the intermediate value according to each point in discharge voltage profile and charging voltage curve draws battery open circuit voltage curve, and then obtains the open-circuit voltage values of mesuring battary under default environment temperature.
2. the assay method of lithium battery open-circuit voltage according to claim 1, is characterized in that, the default environment temperature in described step 2 is-20 ~ 60 DEG C.
3. the assay method of lithium battery open-circuit voltage according to claim 2, is characterized in that, described default environment temperature is-10 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C or 60 DEG C.
4. the assay method of lithium battery open-circuit voltage according to claim 1, is characterized in that, the Preset Time in described step 2 is 8 ~ 24 hours.
5. the assay method of lithium battery open-circuit voltage according to claim 1, is characterized in that, the pre-set constant current in described step 3 is 0.1C ~ 3C.
6. the assay method of lithium battery open-circuit voltage according to claim 5, is characterized in that, described pre-set constant current is 0.1C, 0.2C, 0.3C, 0.5C, 0.8C, 1C, 2C or 3C.
7., according to the assay method of the arbitrary described lithium battery open-circuit voltage of claim 1 to 6, it is characterized in that, the second continuous current in described step 4 is identical with the described first steady current size in step 3.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338646A (en) * | 2016-10-12 | 2017-01-18 | 上海信耀电子有限公司 | Automobile lead acid cell open-circuit voltage (OCV) calculation method and system |
| CN110618389A (en) * | 2019-09-25 | 2019-12-27 | 宝能汽车有限公司 | Method and device for testing battery SOC-OCV curve |
| CN111239620A (en) * | 2020-01-18 | 2020-06-05 | 惠州西盛科技有限公司 | Battery performance judgment method |
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| JP2002250757A (en) * | 2001-02-23 | 2002-09-06 | Yazaki Corp | Method and apparatus for estimation of open circuit voltage of battery for vehicle |
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| CN103439668A (en) * | 2013-09-05 | 2013-12-11 | 桂林电子科技大学 | Charge state evaluation method and system of power lithium ion battery |
| CN104297690A (en) * | 2014-09-22 | 2015-01-21 | 北汽福田汽车股份有限公司 | Lithium battery SOC-OCV curve determination method |
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2015
- 2015-03-16 CN CN201510112510.2A patent/CN104698253A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0711016A2 (en) * | 1994-11-04 | 1996-05-08 | Mitsubishi Denki Kabushiki Kaisha | Parameter measuring method, charge/discharge control method and apparatus and life predicting method for secondary batteries and power storage apparatus using the same |
| JP2002250757A (en) * | 2001-02-23 | 2002-09-06 | Yazaki Corp | Method and apparatus for estimation of open circuit voltage of battery for vehicle |
| JP2003168489A (en) * | 2001-11-30 | 2003-06-13 | Yuasa Corp | Detecting method of charging/discharging state of alkaline storage battery |
| US6832171B2 (en) * | 2002-12-29 | 2004-12-14 | Texas Instruments Incorporated | Circuit and method for determining battery impedance increase with aging |
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| CN104297690A (en) * | 2014-09-22 | 2015-01-21 | 北汽福田汽车股份有限公司 | Lithium battery SOC-OCV curve determination method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338646A (en) * | 2016-10-12 | 2017-01-18 | 上海信耀电子有限公司 | Automobile lead acid cell open-circuit voltage (OCV) calculation method and system |
| CN110618389A (en) * | 2019-09-25 | 2019-12-27 | 宝能汽车有限公司 | Method and device for testing battery SOC-OCV curve |
| CN111239620A (en) * | 2020-01-18 | 2020-06-05 | 惠州西盛科技有限公司 | Battery performance judgment method |
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