CN109870650A - Battery cell monitoring method and system - Google Patents
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 238000012545 processing Methods 0.000 claims description 46
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 11
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Abstract
The invention discloses a kind of battery cell monitoring method and system, battery cell monitoring method is the following steps are included: obtain the energy curves of battery, energy curves characterize energy variation when ideally battery charge or discharge, each energy value of energy curves and a temperature gap of battery correspond, and fiber grating temperature sensor is arranged on battery；The temperature value of battery when acquiring charge or discharge by fiber grating temperature sensor, and calculate the first temperature gap of two temperature values of battery in preset time period；Obtain the first electric energy that battery is filled with or releases within a preset period of time；Corresponding first energy value of the first temperature gap is obtained from energy curves, and judges whether the absolute value of the difference between the first energy value and the first electric energy is greater than or equal to the first preset threshold, if so, battery runs down and exporting warning message.The present invention improves the accuracy of battery cell monitoring data, and improves safety when battery work.
Description
Technical field
The present invention relates to battery cell monitoring field, in particular to the monitoring method and system of a kind of lithium dynamical battery.
Background technique
The power resources of new-energy automobile in the battery PACK processing of battery pack (assemble) of a large amount of lithium dynamical batteries, and
BMS (Battery Management System, battery management system) is the core component of lithium battery PACK, by many electricity
Sub- component is constituted.But the characteristic based on electronic component itself is determined, is easy to be caused to measure number by electromagnetic interference
According to inaccurate；Meanwhile when electronic component work, calorific value with higher itself easily causes short circuit and then leads to lithium battery
The safety of PACK reduces.
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome the accurate of the monitoring data of lithium dynamical battery in the prior art
Property is poor, and the defect that safety is low, provides a kind of battery cell monitoring method and system.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of battery cell monitoring method, it is characterized in that, comprising the following steps:
S1, obtain the energy curves of battery, the energy curves are for characterizing the ideally battery
Energy variation when charge or discharge, each energy value of the energy curves and a temperature gap one for battery are a pair of
It answers, and fiber grating temperature sensor is set on battery；
S2, when acquiring charge or discharge by the fiber grating temperature sensor battery temperature value, and count
Calculate the first temperature gap of two temperature values of the battery in preset time period；
S3, obtain the first electric energy that the battery is filled with or releases in the preset time period；
S4, corresponding first energy value of first temperature gap is obtained from the energy curves, and judge
Whether the absolute value of the difference between first energy value and first electric energy is greater than or equal to the first preset threshold, if
It is that the battery runs down simultaneously exports warning message.
Preferably, in step S1In, the battery includes several battery cores, is respectively set on the surface of each battery core
Fiber grating temperature sensor；
In step S2In, corresponding battery core when acquiring charge or discharge by the fiber grating temperature sensor respectively
Temperature value, and calculate separately the second temperature difference of two temperature values of each battery core in the preset time period；
In step S3In, after obtaining first electric energy, calculates a battery core and be filled with or put in the preset time period
The calculation formula of the second electric energy out, second electric energy is as follows:
The quantity of battery core in second electric energy=the first electric energy/battery；
In step S4In, the second temperature difference for obtaining each battery core from the energy curves respectively is corresponding
Second energy value, and judge whether the absolute value of the difference between second energy value and second electric energy is greater than respectively
Or it is equal to the second preset threshold, if so, the battery runs down and exporting warning message.
Preferably, in step S1In, multiple fiber grating temperature sensors are respectively set on the surface of each battery core；
In step S2In, the temperature of corresponding battery core is acquired respectively in the multiple fiber grating temperature sensors of synchronization
Value, and highest temperature value is chosen from the collected multiple temperature values of synchronization to calculate the second temperature difference.
Preferably, in step S1In, multiple optical fiber grating temperatures are respectively set on the electrode position of each battery core and pass
Sensor.
Preferably, in step S3In, the voltage and current values of battery described in multi collect in the preset time period,
And according to multi collect to voltage and current values calculate be filled with or release in the preset time period first
Electric energy.
Preferably, in step S4In, if it is not, output works normally information, the normal work information is described for characterizing
Battery is in charge and discharge normal condition in the preset time period.
Preferably, the battery is the lithium dynamical battery for new-energy automobile.
A kind of battery monitor system, it is characterized in that, including battery, fiber grating temperature sensor and processing module；
The fiber grating temperature sensor is set on the battery, and is electrically connected with the processing module, described
Processing module is electrically connected with the alarm module；
The fiber grating temperature sensor is used to acquire the temperature value of the battery, and is sent to the processing mould
Block；
The processing module is used to obtain the energy curves of battery, and the energy curves are for characterizing ideal shape
Energy variation under state when the battery charge or discharge, each energy value of the energy curves and a temperature of battery
It spends difference to correspond, the processing module is also used to calculate the first temperature of two temperature values of the battery in preset time period
Spend the absolute value of difference, the processing module is also used to obtain that the battery is filled with or releases in the preset time period the
One electric energy, the processing module are also used to obtain corresponding first energy of first temperature gap from the energy curves
Magnitude, and judge whether the absolute value of the difference between first energy value and first electric energy is greater than or equal to first
Preset threshold, if so, controlling the battery runs down and exporting warning message.
Preferably, the battery includes several battery cores, the fiber grating temperature sensor is respectively arranged at each
On the surface of battery core；
The temperature value of corresponding battery core when the fiber grating temperature sensor for acquiring charge or discharge respectively, and
It is sent to the processing module；
The processing module is used to calculate separately the second of two temperature values of each battery core in the preset time period
Temperature gap after the processing module is also used to obtain first electric energy, calculates a battery core in the preset time period
The calculation formula of the second electric energy for being filled with or releasing, second electric energy is as follows:
The quantity of battery core in second electric energy=the first electric energy/battery；
The second temperature that the processing module is also used to obtain each battery core from the energy curves respectively is poor
It is worth corresponding second energy value, and judges the absolute value of the difference between second energy value and second electric energy respectively
Whether the second preset threshold is greater than or equal to, if so, controlling the battery runs down and exporting warning message.
Preferably, multiple fiber grating temperature sensors are respectively set on the surface of each battery core, multiple optical fiber light
Grid temperature sensor is used to acquire the temperature value of corresponding battery core respectively in synchronization, and is sent to the processing module；
The processing module is also used to choose highest temperature value from the collected multiple temperature values of synchronization to count
Calculate the second temperature difference.
Preferably, multiple fiber grating temperature sensors are respectively set on the electrode position of each battery core.
Preferably, the battery monitor system further includes measure voltage &, the measure voltage & is used
The voltage and current values of the battery described in the multi collect in the preset time period, and it is sent to the processing module；
The processing module be used for according to multi collect to voltage and current values calculate in the preset time
The first electric energy for being filled with or releasing in section.
Preferably, the processing module is also used to judge the absolute value and first electric energy of first temperature gap
When the absolute value of first difference is less than the first preset threshold, output works normally information, and the normal work information is for characterizing
The battery is in charge and discharge normal condition in the preset time period.
Preferably, the battery is the lithium dynamical battery for new-energy automobile.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention
Example.
The positive effect of the present invention is that:
Present invention combination fiber grating temperature sensor effectively monitors battery, not vulnerable to electromagnetic interference, therefore improves
The accuracys of battery cell monitoring data, and be not easy to cause short circuit, to substantially increase safety when battery work.
Detailed description of the invention
Fig. 1 is the flow chart of the battery cell monitoring method of the embodiment of the present invention 1.
Fig. 2 is the structural schematic diagram of the battery monitor system of the embodiment of the present invention 2.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
Embodiment 1
The present embodiment provides a kind of battery cell monitoring methods, and in the present embodiment, the battery is for new-energy automobile
Lithium dynamical battery, but battery types are not limited specifically, different types of battery can be monitored according to the actual situation.
As shown in Figure 1, the battery cell monitoring method the following steps are included:
Step 101, the energy curves for obtaining battery.
In this step, the energy curves of the battery are obtained and stored in advance, and the energy curves are used for
Characterize energy variation when the ideally battery charge or discharge, each energy value and electricity of the energy curves
One temperature gap in pond corresponds.
Fiber grating temperature sensor is set in step 102, battery.
In the present embodiment, the battery includes several battery cores, and the quantity of battery core can determine according to the actual situation, this
Embodiment does not limit the particular number of battery core specifically.
In this step, multiple fiber grating temperature sensors are respectively set on the electrode position on the surface of each battery core
Fiber grating temperature sensor is set to the accuracy that test data can be improved on the electrode position on the surface of battery core by device, but
The setting position for not limiting fiber grating temperature sensor specifically can carry out self-setting according to the actual situation, nor have
Body limits the quantity of fiber grating temperature sensor, and the quantity of fiber grating temperature sensor keeps test result more quasi-
Really, the problems such as but considering cost or space, it is not recommended that setting is excessive.
Step 103, the temperature value that battery is acquired by fiber grating temperature sensor, and calculate two in preset time period
The temperature gap of a temperature value.
In this step, corresponding battery core when by the fiber grating temperature sensor acquiring charge or discharge respectively
Temperature value, and the second temperature difference of two temperature values of each battery core in the preset time period is calculated separately, at this point,
For a certain battery core, the multiple fiber grating temperature sensors being arranged in the synchronization battery core acquire the battery core respectively
Temperature value, and it is poor to calculate the second temperature from the collected multiple temperature values of synchronization to choose highest temperature value
Value, so that collected temperature value is more accurate.
Step 104 obtains the electric energy that battery generates within a preset period of time.
In this step, in the preset time period battery described in multi collect voltage and current values, and root
According to multi collect to voltage and current values calculate the first electric energy for being filled with or releasing in the preset time period.
In this step, it after obtaining first electric energy, calculates a battery core and is filled with or puts in the preset time period
The calculation formula of the second electric energy out, second electric energy is as follows:
The quantity of battery core in second electric energy=the first electric energy/battery.
Step 105 obtains the corresponding energy value of temperature gap from energy curves.
In this step, the second temperature difference for obtaining each battery core from the energy curves respectively is corresponding
Second energy value.
Step 106 judges whether the absolute value of the difference between energy value and electric energy is greater than or equal to preset threshold, if
It is to execute step 107, if it is not, executing step 108.
In this step, judge respectively the difference between second energy value and second electric energy absolute value whether
More than or equal to the second preset threshold, if so, step 107 is executed, if it is not, executing step 108.
In the present embodiment, second preset threshold can carry out sets itself according to the actual situation.
Step 107, battery runs down simultaneously export warning message.
In this step, when the absolute value of the difference between second energy value and second electric energy is greater than or equal to
When the second preset threshold, then it represents that there is exception in battery, therefore, battery runs down is immediately controlled and exports warning message, so that
Staff detects in time and repairs the battery.
Step 108, output work normally information.
In this step, pre- less than second when the absolute value of the difference between second energy value and second electric energy
If when threshold value, then it represents that normal battery operation, therefore, output work normally information, and the normal work information is for characterizing institute
Battery is stated in the preset time period in charge and discharge normal condition.
Battery cell monitoring method combination fiber grating temperature sensor provided in this embodiment effectively monitors battery, is not easy
By electromagnetic interference, therefore the accuracy of battery cell monitoring data is improved, and be not easy to cause short circuit, to substantially increase battery
Safety when work.
Embodiment 2
The present embodiment provides a kind of battery monitor systems, and in the present embodiment, the battery is for new-energy automobile
Lithium dynamical battery, but battery types are not limited specifically, different types of battery can be monitored according to the actual situation.
As shown in Fig. 2, battery monitor system 1 includes battery 2, several fiber grating temperature sensors 3, voltage and current inspection
Module 4 and processing module 5 are surveyed, battery 2 includes several battery cores 21, in the present embodiment, does not limit battery core and optical fiber specifically
The quantity of grating temperature sensor can determine according to the actual situation.
Multiple fiber grating temperature sensors are respectively set on the electrode position on the surface of each battery core, by optical fiber light
Grid temperature sensor is set to the accuracy that test data can be improved on the electrode position on the surface of battery core, but not specific restriction
The setting position of fiber grating temperature sensor can come self-setting, the number of fiber grating temperature sensor according to the actual situation
Measure keep test result more accurate, but the problems such as consider cost or space, it is not recommended that setting is excessive.
Each fiber grating temperature sensor is electrically connected with processing module respectively, measure voltage & respectively with electricity
Pond and processing module electrical connection.
Processing module is used to obtain and store in advance the energy curves of the battery, and the energy curves are used for
Characterize energy variation when the ideally battery charge or discharge, each energy value and electricity of the energy curves
One temperature gap in pond corresponds.
Each fiber grating temperature sensor is respectively used to the temperature value of corresponding battery core when acquisition charge or discharge, and
And it is respectively sent to processing module, processing module is used to calculate separately two temperature of each battery core in the preset time period
The second temperature difference of value, at this point, for a certain battery core, multiple optical fiber grating temperatures for being arranged in the synchronization battery core
Sensor acquires the temperature value of the battery core respectively, and is respectively sent to processing module, and processing module is collected from synchronization
Multiple temperature values in choose highest temperature value to calculate the second temperature difference, so that collected temperature value is more
Accurately.
Voltage and current values of the measure voltage & for the multi collect battery in the preset time period, and
And be sent to processing module, processing module be used for according to multi collect to voltage and current values calculate described default
The first electric energy for being filled with or releasing in period.
After processing module is also used to obtain first electric energy, calculate a battery core be filled in the preset time period or
The second electric energy released, the calculation formula of second electric energy are as follows:
The quantity of battery core in second electric energy=the first electric energy/battery.
Processing module is also used to obtain the second temperature difference pair of each battery core from the energy curves respectively
The second energy value answered, and judge respectively difference between second energy value and second electric energy absolute value whether
More than or equal to the second preset threshold, if so, controlling the battery runs down and exporting warning message, if it is not, output works normally
Information.
In the present embodiment, second preset threshold can carry out sets itself according to the actual situation.
In the present embodiment, when the absolute value of the difference between second energy value and second electric energy is greater than or waits
When the second preset threshold, then it represents that there is exception in battery, therefore, battery runs down is immediately controlled and exports warning message, so that
Staff is obtained to detect in time and repair the battery.
In the present embodiment, when the absolute value of the difference between second energy value and second electric energy is less than second
When preset threshold, then it represents that normal battery operation, therefore, output work normally information, and the normal work information is for characterizing
The battery is in charge and discharge normal condition in the preset time period.
Battery monitor system combination fiber grating temperature sensor provided in this embodiment effectively monitors battery, is not easy
By electromagnetic interference, therefore the accuracy of battery cell monitoring data is improved, and be not easy to cause short circuit, to substantially increase battery
Safety when work.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (14)
1. a kind of battery cell monitoring method, which comprises the following steps:
S1, obtain the energy curves of battery, the energy curves for characterize ideally battery charging or
Energy variation when electric discharge, each energy value of the energy curves and a temperature gap of battery correspond, and
And fiber grating temperature sensor is set on battery；
S2, when acquiring charge or discharge by the fiber grating temperature sensor battery temperature value, and calculate default
First temperature gap of two temperature values of the battery in period；
S3, obtain the first electric energy that the battery is filled with or releases in the preset time period；
S4, corresponding first energy value of first temperature gap is obtained from the energy curves, and judge described
Whether the absolute value of the difference between one energy value and first electric energy is greater than or equal to the first preset threshold, if so, described
Battery runs down simultaneously exports warning message.
2. battery cell monitoring method as described in claim 1, which is characterized in that in step S1In, the battery includes several electricity
Fiber grating temperature sensor is respectively set on the surface of each battery core in core；
In step S2In, the temperature of corresponding battery core when acquiring charge or discharge by the fiber grating temperature sensor respectively
Value, and calculate separately the second temperature difference of two temperature values of each battery core in the preset time period；
In step S3In, after obtaining first electric energy, calculate that a battery core is filled with or releases in the preset time period the
The calculation formula of two electric energy, second electric energy is as follows:
The quantity of battery core in second electric energy=the first electric energy/battery；
In step S4In, the second temperature difference corresponding second of each battery core is obtained from the energy curves respectively
Energy value, and judge whether the absolute value of the difference between second energy value and second electric energy is greater than or waits respectively
In the second preset threshold, if so, the battery runs down and exporting warning message.
3. battery cell monitoring method as claimed in claim 2, which is characterized in that in step S1In, on the surface of each battery core
Multiple fiber grating temperature sensors are respectively set；
In step S2In, the temperature value of corresponding battery core is acquired respectively in the multiple fiber grating temperature sensors of synchronization, and
Highest temperature value is chosen from the collected multiple temperature values of synchronization to calculate the second temperature difference.
4. battery cell monitoring method as claimed in claim 3, which is characterized in that in step S1In, in the electrode position of each battery core
It sets and multiple fiber grating temperature sensors is respectively set.
5. battery cell monitoring method as described in claim 1, which is characterized in that in step S3In, it is more in the preset time period
The voltage and current values of the secondary acquisition battery, and according to multi collect to voltage and current values calculate in institute
State the first electric energy for being filled with or releasing in preset time period.
6. battery cell monitoring method as described in claim 1, which is characterized in that in step S4In, if it is not, output works normally letter
Breath, the normal work information is for characterizing the battery in the preset time period in charge and discharge normal condition.
7. the battery cell monitoring method as described in any one of claim 1~6, which is characterized in that the battery is for new
The lithium dynamical battery of energy automobile.
8. a kind of battery monitor system, which is characterized in that including battery, fiber grating temperature sensor and processing module；
The fiber grating temperature sensor is set on the battery, and is electrically connected with the processing module；
The fiber grating temperature sensor is used to acquire the temperature value of the battery, and is sent to the processing module；
The processing module is used to obtain the energy curves of battery, and the energy curves are for characterizing ideally
Energy variation when the battery charge or discharge, each energy value of the energy curves and a temperature difference of battery
Value corresponds, and the processing module is also used to calculate the first temperature difference of two temperature values of the battery in preset time period
The absolute value of value, the processing module are also used to obtain the first electricity that the battery is filled with or releases in the preset time period
Can, the processing module is also used to obtain corresponding first energy of first temperature gap from the energy curves
Value, and it is pre- to judge whether the absolute value of the difference between first energy value and first electric energy is greater than or equal to first
If threshold value, if so, controlling the battery runs down and exporting warning message.
9. battery monitor system as claimed in claim 8, which is characterized in that the battery includes several battery cores, the light
Fine grating temperature sensor is respectively arranged on the surface of each battery core；
The temperature value of corresponding battery core when the fiber grating temperature sensor for acquiring charge or discharge respectively, and send
To the processing module；
The processing module is used to calculate separately the second temperature of two temperature values of each battery core in the preset time period
Difference after the processing module is also used to obtain first electric energy, calculates a battery core and is filled in the preset time period
Or the second electric energy released, the calculation formula of second electric energy are as follows:
The quantity of battery core in second electric energy=the first electric energy/battery；
The processing module is also used to obtain the second temperature difference pair of each battery core from the energy curves respectively
The second energy value answered, and judge respectively difference between second energy value and second electric energy absolute value whether
More than or equal to the second preset threshold, if so, controlling the battery runs down and exporting warning message.
10. battery monitor system as claimed in claim 9, which is characterized in that be respectively set on the surface of each battery core
Multiple fiber grating temperature sensors, multiple fiber grating temperature sensors are used to acquire corresponding battery core respectively in synchronization
Temperature value, and be sent to the processing module；
The processing module is also used to choose highest temperature value from the collected multiple temperature values of synchronization to calculate
State second temperature difference.
11. battery monitor system as claimed in claim 10, which is characterized in that on the electrode position of each battery core respectively
Multiple fiber grating temperature sensors are set.
12. battery monitor system as claimed in claim 8, which is characterized in that the battery monitor system further includes voltage electricity
Flow detection module, voltage value of the measure voltage & for battery described in the multi collect in the preset time period
And current value, and it is sent to the processing module；
The processing module be used for according to multi collect to voltage and current values calculate in the preset time period
The first electric energy for being filled with or releasing.
13. battery monitor system as claimed in claim 8, which is characterized in that the processing module is also used to judge described
When the absolute value of first difference of the absolute value of one temperature gap and first electric energy is less than the first preset threshold, output is normal
Job information, the normal work information is for characterizing the battery in the preset time period in the normal shape of charge and discharge
State.
14. the battery monitor system as described in any one of claim 8~13, which is characterized in that the battery be for
The lithium dynamical battery of new-energy automobile.
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| CN112895976A (en) * | 2021-02-01 | 2021-06-04 | 重庆峘能电动车科技有限公司 | Battery cell early warning protection method and system |
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