CN103163475A - System on chip (SOC) value measuring method of battery system - Google Patents
System on chip (SOC) value measuring method of battery system Download PDFInfo
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- CN103163475A CN103163475A CN2013100435808A CN201310043580A CN103163475A CN 103163475 A CN103163475 A CN 103163475A CN 2013100435808 A CN2013100435808 A CN 2013100435808A CN 201310043580 A CN201310043580 A CN 201310043580A CN 103163475 A CN103163475 A CN 103163475A
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Abstract
The invention provides a system on chip (SOC) value measuring method of a battery system. The SOC value measuring method of the battery system comprises the following steps: detecting actual electric charge electric quantity of the battery system; and acquiring an SOC value of the battery system by using the actual electric charge electric quantity to divide the nominal capacity of the battery system. The SOC value measuring method of the battery system can precisely measure the SOC value of the battery system, can objectively detect the SOC value of power batteries with different sizes and different systems, and therefore usable electric quantity of the battery system can be authentically reflected.
Description
Technical field
The present invention relates to battery technology, relate in particular to a kind of SOC values determination method of battery system.
Background technology
Battery system is usually by a plurality of cells and battery management system (Battery Management System, BMS) form, a plurality of cells are integrated in battery system in the mode of series, parallel or string and series-parallel connection, battery management system is used for the state of a plurality of cells is monitored and managed, improve the performance of battery system, prevent from overcharging or over-discharge can, extend the serviceable life of battery system.In the evaluation index of battery system performance, state-of-charge (State of Charge, SOC) be a very important technical indicator, be ratio with the actual capacity of the charged electric weight of battery system and battery system as the SOC index, usually represent with percentage.
Need to measure the charged electric weight of battery system in the process that SOC is measured, also to measure the actual capacity of battery, the method of measuring has a variety of, usually the method that adopts is for to discharge fully to battery system, measure the charged electric weight of battery system, battery system is carried out complete charge and discharge, and measure the actual capacity of battery system in the process of charge and discharge, the actual capacity of charged electric weight and battery system is made division, and then be expressed as percentage.
After but battery system is shelved a period of time in use for some time or for a long time, some variations can occur in the chemical substance of battery system inside, and battery system serviceability under different temperature conditions is different, even battery system is fully charged, can not reach the electric weight capacity that battery system has when dispatching from the factory.In these cases, the battery system actual capacity that the employing prior art measures also is not equal to the actual capacity of battery system when dispatching from the factory, and the SOC value is measured all needs actual capacity is measured at every turn, complex steps and have certain measured deviation, therefore the actual capacity that residual capacity and timing signal is measured is made division and can not be obtained real SOC index, therefore the SOC values determination method that needs a kind of new battery system is with the SOC value of Accurate Determining battery system.
Summary of the invention
The invention provides a kind of SOC values determination method of battery system, with the SOC value of Accurate Determining battery system.
The SOC values determination method of a kind of battery system that the embodiment of the present invention provides comprises:
Detect the actual charged electric weight of battery system;
Obtain the SOC value of described battery system divided by the nominal capacity of described battery system by the charged electric weight of described reality.
The technical scheme that the embodiment of the present invention provides by detecting the actual charged electric weight of battery system, with the nominal capacity of the charged electric weight of this reality divided by battery system, obtains the SOC value of battery system, SOC value that can the Accurate Determining battery system.And the technical scheme of the present embodiment can be objectively measured the SOC value of the electrokinetic cell of different model, different systems, truly reflects the made power consumption of battery system.
Description of drawings
The process flow diagram of the SOC values determination method of the battery system that Fig. 1 provides for the embodiment of the present invention;
Another process flow diagram of the SOC values determination method of the battery system that Fig. 2 provides for the embodiment of the present invention;
The another process flow diagram of the SOC values determination method of the battery system that Fig. 3 provides for the embodiment of the present invention;
The another process flow diagram of the SOC values determination method of the battery system that Fig. 4 provides for the embodiment of the present invention.
Embodiment
The process flow diagram of the SOC values determination method of the battery system that Fig. 1 provides for the embodiment of the present invention, another process flow diagram of the SOC values determination method of the battery system that Fig. 2 provides for the embodiment of the present invention, the another process flow diagram of the SOC values determination method of the battery system that the another process flow diagram of the SOC values determination method of the battery system that Fig. 3 provides for the embodiment of the present invention, Fig. 4 provide for the embodiment of the present invention.As shown in Fig. 1-4, the SOC values determination method of battery system comprises:
The actual charged electric weight of step 10, detection battery system.
Measuring method to the actual charged electric weight of battery system has a variety of, for example battery system is discharged, and the discharge current of measurement battery system a plurality of time points in completing discharge process, according to completing the discharge time used, discharge current is carried out integral and calculating again, obtain the actual charged electric weight of battery system; Perhaps first battery system is charged, measure the charged electric weight that charging process increases, again the battery system that is full of electricity is discharged, measure the charged electric weight of emitting in discharge process, the charged electric weight that deducts increase with the charged electric weight of emitting obtains the actual charged electric weight of battery system, and capacity measuring method commonly used in other prior aries.
Battery system needs before dispatching from the factory through detecting, and detects to comprise that the parameters such as output voltage, charging voltage and nominal capacity are as the running parameter of battery system use procedure Plays after dispatching from the factory.Wherein nominal capacity is definite value, the electric weight that the expression battery system can be emitted when dispatching from the factory.
With the actual charged electric weight of the battery system that detects in step 10 nominal capacity divided by battery system, as the SOC value of battery system.Because nominal capacity is just fixing when battery system dispatches from the factory, after battery uses a period of time or a period of time of shelving, the actual charged electric weight that detection obtains is divided by nominal capacity, keep two position effective digitals, represent with percentage, can truly detect the actual situation of change that makes power consumption of battery system.
The technical scheme of the present embodiment by detecting the actual charged electric weight of battery system, with the nominal capacity of the charged electric weight of this reality divided by battery system, obtains the SOC value of battery system, SOC value that can the Accurate Determining battery system.And the technical scheme of the present embodiment can be objectively measured the SOC value of the electrokinetic cell of different model, different systems, truly reflects the made power consumption of battery system.
Preferably, in the process that the actual charged electric weight to battery system detects, the present embodiment adopts battery system is discharged, and measures the method for the actual charged electric weight of battery system in completing discharge process, is specifically as follows:
The electric weight that step 102, detection battery system are emitted in completing discharge process is as the actual charged electric weight of battery system.
Discharge load is connected with the battery system that is full of electricity, controls battery system and discharge, and from beginning to be discharged to the process of discharge off, detect the electric weight that battery system is emitted, be the actual charged electric weight of battery system.
The method that wherein detects the electric weight that battery system emits specifically can adopt following methods:
The discharge current of step 1021, detection battery system a plurality of time points in completing discharge process.
Be specifically as follows: begin to be discharged to the whole process of discharge off from battery system, at a plurality of time points, discharge current is measured, obtain current value I corresponding to time t (t).The time interval between adjacent two time points is shorter, and the discharge current value that obtains is more accurate, makes measurement result near real numerical value.The process that discharge current is measured can adopt current sensor commonly used in prior art to detect and send data analysis and computing equipment to, to sample rate current data analysis and processing.To record simultaneously battery system from beginning to be discharged to discharge off T discharge time used, i.e. the time of discharge current output.T carries out integral and calculating to the electric current that measures according to discharge time, and the electric weight Q that emits in completing discharge process of battery system is:
Being the electric weight that battery system is emitted, is also the actual charged electric weight of battery system.
Perhaps, the method that detects the electric weight that battery system emits also can adopt following methods:
Step 1023, measure by voltameter the electric weight that battery system is emitted in completing discharge process, as the actual charged electric weight of battery system.
Be specifically as follows: begin to be discharged to the whole process of discharge off from battery system, adopt voltameter to measure the electric weight that battery system is emitted, the i.e. actual charged electric weight of battery system.Voltameter can adopt the instrument that can measure lasting quantity of electric charge variation commonly used in prior art.
The actual charged electric weight that step 1022 or step 1023 are measured obtains the SOC value of battery system divided by the nominal capacity of battery system.
Technique scheme is by detecting the made power consumption that is full of electric battery system, obtain the actual charged electric weight of battery system, with the nominal capacity of the charged electric weight of this reality divided by battery system, obtain the SOC value of battery system, SOC value that can the Accurate Determining battery system.And the technical scheme of the present embodiment can be objectively measured the SOC value of the electrokinetic cell of different model, different systems, truly reflects the made power consumption of battery system.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (4)
1. the SOC values determination method of a battery system, is characterized in that, comprising:
Detect the actual charged electric weight of battery system;
Obtain the SOC value of described battery system divided by the nominal capacity of described battery system by the charged electric weight of described reality.
2. the SOC values determination method of battery system according to claim 1, is characterized in that, the actual charged electric weight of described detection battery system comprises:
With described battery system discharge;
Detect the electric weight that described battery system is emitted in completing discharge process.
3. the SOC values determination method of battery system according to claim 2, is characterized in that, the electric weight that the described battery system of described detection is emitted in completing discharge process comprises:
Detect the discharge current of described battery system a plurality of time points in completing discharge process;
According to discharge time described discharge current being carried out integral and calculating, to obtain described electric weight of emitting.
4. the SOC values determination method of battery system according to claim 2, is characterized in that, the electric weight that the described battery system of described detection is emitted in completing discharge process comprises:
Measure by voltameter the electric weight that described battery system is emitted in completing discharge process.
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| CN2013100435808A CN103163475A (en) | 2013-02-04 | 2013-02-04 | System on chip (SOC) value measuring method of battery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698729A (en) * | 2013-12-26 | 2014-04-02 | 普天新能源车辆技术有限公司 | Method and device for determining balance capacity of battery management system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103698729A (en) * | 2013-12-26 | 2014-04-02 | 普天新能源车辆技术有限公司 | Method and device for determining balance capacity of battery management system |
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