CN105652215A - Method and device for detecting SOH (state of health) of battery - Google Patents
Method and device for detecting SOH (state of health) of battery Download PDFInfo
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- CN105652215A CN105652215A CN201610211242.4A CN201610211242A CN105652215A CN 105652215 A CN105652215 A CN 105652215A CN 201610211242 A CN201610211242 A CN 201610211242A CN 105652215 A CN105652215 A CN 105652215A
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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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
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention relates to a method and a device for detecting SOH (state of health) of a battery. The method comprises the following steps: the internal resistance R0 of the battery is acquired through an alternating current power supply; the internal resistance R1 of the battery in a discharge state is acquired through the alternating current power supply; the SOH value of the battery is calculated according to R0 and R1. According to the method, the internal resistance of the battery is acquired directly through the alternating current power supply, the SOH of the battery is judged on the basis, compared with conventional on-line measurement of the internal resistance, the measurement is more convenient and accurate, and analysis is faster.
Description
Technical field
The present invention relates to cell art, particularly relate to detection method and the device of a kind of accumulator health status.
Background technology
Along with the development of society, the application of lithium-ions battery is more and more extensive, particularly in the application of the aspects such as electric motor car.
In the use procedure of lithium-ions battery, it is necessary to the health status of real-time assessment lithium-ions battery, to judge that lithium-ions battery is the need of replacing. Generally represent the health status of lithium-ions battery with SOH (StateOfHealth), in the industry, SOH is the very important quantity of state evaluating lithium-ions battery degree of aging. The SOH of usual lithium-ions battery includes the indexs such as degree of aging.
The conventional method estimating SOH is generally adopted internal resistance method, but generally the on-line testing of internal resistance is extremely difficult, and is difficult to analyze.
Summary of the invention
Based on this, it is necessary to provide detection method and the device of a kind of accumulator health status, facilitate calculating accumulator internal resistance value, quickly judge whether accumulator is in health status.
A kind of detection method of accumulator health status, including:
The internal resistance value R of accumulator is obtained by alternating current power supply0;
Described accumulator internal resistance value R in the discharged condition is obtained by alternating current power supply1;
According to described R0And R1Calculate the health status SOH value of described accumulator.
In the detection method of the above accumulator health status, directly being obtained the internal resistance value of accumulator by alternating current power supply, and judge the health status of accumulator according to this, relative to conventional on-line measurement internal resistance value, it is more convenient, accurate to measure, and analyzes faster.
Wherein in an embodiment, the described internal resistance value R being obtained accumulator by alternating current power supply0Step include:
Ac current source is is connected at described accumulator two ends0, wherein, is0(wt)=A0cos(wt), A0For current amplitude, t is the time, and w is angle;
Obtain the voltage V at described accumulator two ends0With described voltage V0With described current source is0Between angle theta0, wherein, V0(wt)=B0cos(wt-��0), B0For voltage magnitude;
According to described current source is0With voltage V0Obtain the internal resistance value R of described accumulator0, wherein, R0=V0(wt)/is0(wt)=B0/A0[cos��0+tan(wt)sin(��0)]��
Wherein in an embodiment, the described internal resistance value R being obtained accumulator by alternating current power supply0Step also include:
To described internal resistance value R0Carry out low-pass filtering, obtain filtered internal resistance value R0=B0/A0cos��0��
Wherein in an embodiment, described obtain described accumulator internal resistance value R in the discharged condition by alternating current power supply1Step include:
Ac current source is is connected at described accumulator two ends1, wherein, is0(wt)=A1cos(wt), A1For current amplitude, t is the time, and w is angle;
Obtain the voltage V at described accumulator two ends1With described voltage V1With described current source is1Between angle theta1, wherein, V1(wt)=B1cos(wt-��1), B1For voltage magnitude;
According to described current source is1With voltage V1Obtain the internal resistance value R of described accumulator1, wherein, R1=V1(wt)/is1(wt)=B1/A1[cos��1+tan(wt)sin(��1)]��
Wherein in an embodiment, described obtain described accumulator internal resistance value R in the discharged condition by alternating current power supply1Step also include:
To described internal resistance value R1Carry out low-pass filtering, obtain filtered internal resistance value R1=B1/A1cos��1��
Wherein in an embodiment, according to described R0And R1The step of the health status SOH value calculating described accumulator includes:
Calculate described internal resistance value R0With described internal resistance value R1Ratio, if described ratio is more than 1, then the value giving described SOH is 1, and otherwise, the value giving described SOH is between 0 to 1, and wherein, the value of described SOH is the 1 described accumulator of expression is new battery, and otherwise, the value of described SOH represents that described accumulator is aged battery.
Wherein in an embodiment, under identical conditions, obtain described internal resistance value R0With internal resistance value R1, described identical conditions includes ambient temperature residing for the dump energy of described accumulator and accumulator.
A kind of detecting device of accumulator health status, including:
First module, for obtaining the internal resistance value R of accumulator by alternating current power supply0;
Second module, for obtaining described accumulator internal resistance value R in the discharged condition by alternating current power supply1;
Three module, for according to described R0And R1Calculate the health status SOH value of described accumulator.
In the detecting device of the above accumulator health status, directly being obtained the internal resistance value of accumulator by alternating current power supply, and judge the health status of accumulator according to this, relative to conventional on-line measurement internal resistance value, it is more convenient, accurate to measure, and analyzes faster.
Wherein in an embodiment, the alternating current power supply that described first module and the second module adopt is identical alternating constant current source.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the detection method of an embodiment accumulator health status;
Fig. 2 is the schematic flow sheet of step S120 in Fig. 1;
Fig. 3 is another schematic flow sheet of step S120 in Fig. 1;
Fig. 4 is the schematic flow sheet of step S140 in Fig. 1;
Fig. 5 is another schematic flow sheet of step S140 in Fig. 1;
Fig. 6 is the principle schematic measuring internal resistance value in Fig. 1;
Fig. 7 is the structural representation of the detecting device of an embodiment accumulator health status.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
As it is shown in figure 1, the detection method of an embodiment accumulator health status includes step S120 to step S160.
Step S120, obtains the internal resistance value R of accumulator by alternating current power supply0. What this step obtained is accumulator internal resistance value under non-discharged state, and this step can under different conditions when obtaining internal resistance value, the condition such as including accumulator dump energy, external environment temperature. This step can be passed through to connect constant ac current source at accumulator two ends and realize, concrete, as in figure 2 it is shown, this step includes step S121 to step S123.
Step S121, connects ac current source is at accumulator two ends0, wherein, is0(wt)=A0cos(wt), A0For current amplitude, t is the time, and w is angle.
Step S122, obtains the voltage V at accumulator two ends0With voltage V0With current source is0Between angle theta0, wherein, V0(wt)=B0cos(wt-��0), B0For voltage magnitude.
Step S123, according to current source is0With voltage V0Obtain the internal resistance value R of accumulator0, wherein, R0=V0(wt)/is0(wt)=B0/A0[cos��0+tan(wt)sin(��0)]��
Wherein, step S123 the internal resistance value R obtained0On-fixed value, for this, as it is shown on figure 3, step S120 also includes step S124.
Step S124, to internal resistance value R0Carry out low-pass filtering, obtain filtered internal resistance value R0=B0/A0cos��0. This step is by after low-pass filtering, and the internal resistance value of acquisition is fixed value R0=B0/A0cos��0��
Step S140, obtains accumulator internal resistance value R in the discharged condition by alternating current power supply1. What this step obtained is accumulator internal resistance value in the discharged condition, when accumulator is in discharge condition, it is possible to whether measure its internal resistance value when discharge condition more than its resistance value when non-discharged state, to judge the health status of accumulator. In the present embodiment, for ensureing the internal resistance value comparability measured, this step and step S120 realize under identical conditions, and namely the measuring condition of this step and the measuring condition of step S120 are identical, such as conditions such as accumulator dump energy, external environment temperature. Concrete, this step includes step S141 to step S143.
Step S141, connects ac current source is at accumulator two ends1, wherein, is0(wt)=A1cos(wt), A1For current amplitude, t is the time, and w is angle;
Step S142, obtains the voltage V at accumulator two ends1With voltage V1With current source is1Between angle theta1, wherein, V1(wt)=B1cos(wt-��1), B1For voltage magnitude;
Step S143, according to current source is1With voltage V1Obtain the internal resistance value R of accumulator1, wherein, R1=V1(wt)/is1(wt)=B1/A1[cos��1+tan(wt)sin(��1)]��
Wherein, step S143 the internal resistance value R obtained1On-fixed value, for this, as it is shown in figure 5, step S140 also includes step S144.
Step S144, to internal resistance value R1Carry out low-pass filtering, obtain filtered internal resistance value R1=B1/A1cos��1. This step is by after low-pass filtering, and the internal resistance value of acquisition is fixed value R1=B1/A1cos��1��
Step S160, according to R0And R1The health status SOH value of calculating accumulator. Concrete, this step includes: calculate internal resistance value R0With internal resistance value R1Ratio, if ratio is more than 1, then the value giving SOH is 1, otherwise, give SOH value be between 0 to 1, wherein, the value of SOH is 1 expression accumulator is new battery, the value of SOH be between 0 to 1 represent accumulator be aged battery. When ratio is more than 1, then internal resistance value R0More than internal resistance value R1, when discharge condition, owing to the internal resistance value of accumulator diminishes, then the health status of accumulator is normal, then the value giving SOH is 1, and expression accumulator is health status. Otherwise, accumulator is when discharge condition, and its internal resistance value becomes big, then accumulator is weathered, then giving SOH is 0-1, it is possible in time accumulator is safeguarded or updates.
In the detection method of the above accumulator health status, directly being obtained the internal resistance value of accumulator by alternating current power supply, and judge the health status of accumulator according to this, relative to conventional on-line measurement internal resistance value, it is more convenient, accurate to measure, and analyzes faster.
In the present embodiment, conveniently, ac current source is0With ac current source is1It is identical alternating constant current source. As shown in Figure 6, adding current source is at the two ends of accumulator L, the voltmeter V being connected to accumulator L both sides can measure the voltage V of corresponding accumulator0And V1, according to current source is and voltage V0And V1The internal resistance value R of accumulator can be measured0And R1, and finally calculate the health status SOH value of accumulator.
As it is shown in fig. 7, the detecting device of an embodiment accumulator health status includes first module the 120, second module 140 and three module 160.
First module 120 for obtaining the internal resistance value R of accumulator by alternating current power supply0. What the first module 120 obtained is accumulator internal resistance value under non-discharged state, and can under different conditions when obtaining internal resistance value, the condition such as including accumulator dump energy, external environment temperature. Internal resistance value R can be obtained by connecting constant ac current source at accumulator two ends0, concrete, it is possible to connect ac current source is at accumulator two ends0, wherein, is0(wt)=A0cos(wt), A0For current amplitude, t is the time, and w is angle; Obtain the voltage V at accumulator two ends0With voltage V0With current source is0Between angle theta0, wherein, V0(wt)=B0cos(wt-��0), B0For voltage magnitude; According to current source is0With voltage V0Obtain the internal resistance value R of accumulator0, wherein, R0=V0(wt)/is0(wt)=B0/A0[cos��0+tan(wt)sin(��0)]. Wherein, the internal resistance value R of acquisition0On-fixed value, for this, it is also possible to internal resistance value R0Carry out low-pass filtering, obtain filtered internal resistance value R0=B0/A0cos��0. After low-pass filtering, the internal resistance value of acquisition is fixed value R0=B0/A0cos��0��
Second module 140 is for obtaining accumulator internal resistance value R in the discharged condition by alternating current power supply1. What the second module 140 obtained is accumulator internal resistance value in the discharged condition, when accumulator is in discharge condition, it is possible to whether measure its internal resistance value when discharge condition more than its resistance value when non-discharged state, to judge the health status of accumulator. In the present embodiment, for ensureing the internal resistance value comparability measured, the second module 140 and the first module 120 realize under identical conditions, and namely measuring condition is identical, such as conditions such as accumulator dump energy, external environment temperature. Concrete, it is possible to ac current source is is connected at accumulator two ends1, wherein, is0(wt)=A1cos(wt), A1For current amplitude, t is the time, and w is angle; Obtain the voltage V at accumulator two ends1With voltage V1With current source is1Between angle theta1, wherein, V1(wt)=B1cos(wt-��1), B1For voltage magnitude; According to current source is1With voltage V1Obtain the internal resistance value R of accumulator1, wherein, R1=V1(wt)/is1(wt)=B1/A1[cos��1+tan(wt)sin(��1)]. Wherein, the internal resistance value R of acquisition1On-fixed value, for this, it is possible to internal resistance value R1Carry out low-pass filtering, obtain filtered internal resistance value R1=B1/A1cos��1. After low-pass filtering, the internal resistance value of acquisition is fixed value R1=B1/A1cos��1��
Three module 160 is for according to R0And R1The health status SOH value of calculating accumulator. Concrete, three module 160 calculates internal resistance value R0With internal resistance value R1Ratio, if ratio is more than 1, then the value giving SOH is 1, otherwise, give SOH be between 0 to 1, wherein, the value of SOH is 1 expression accumulator is new battery, the value of SOH be between 0 to 1 represent accumulator be aged battery. When ratio is more than 1, then internal resistance value R0More than internal resistance value R1, when discharge condition, owing to the internal resistance value of accumulator diminishes, then the health status of accumulator is normal, then the value giving SOH is 1, and expression accumulator is health status. Otherwise, accumulator is when discharge condition, and its internal resistance value becomes big, then accumulator is weathered, then giving SOH is 0-1, it is possible in time accumulator is safeguarded or updates.
In the detecting device of the above accumulator health status, directly being obtained the internal resistance value of accumulator by alternating current power supply, and judge the health status of accumulator according to this, relative to conventional on-line measurement internal resistance value, it is more convenient, accurate to measure, and analyzes faster.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics is absent from contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent. It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. the detection method of an accumulator health status, it is characterised in that including:
The internal resistance value R of accumulator is obtained by alternating current power supply0;
Described accumulator internal resistance value R in the discharged condition is obtained by alternating current power supply1;
According to described R0And R1Calculate the health status SOH value of described accumulator.
2. detection method according to claim 1, it is characterised in that the described internal resistance value R being obtained accumulator by alternating current power supply0Step include:
Ac current source is is connected at described accumulator two ends0, wherein, is0(wt)=A0cos(wt), A0For current amplitude, t is the time, and w is angle;
Obtain the voltage V at described accumulator two ends0With described voltage V0With described current source is0Between angle theta0, wherein, V0(wt)=B0cos(wt-��0), B0For voltage magnitude;
According to described current source is0With voltage V0Obtain the internal resistance value R of described accumulator0, wherein, R0=V0(wt)/is0(wt)=B0/A0[cos��0+tan(wt)sin(��0)]��
3. detection method according to claim 2, it is characterised in that the described internal resistance value R being obtained accumulator by alternating current power supply0Step also include:
To described internal resistance value R0Carry out low-pass filtering, obtain filtered internal resistance value R0=B0/A0cos��0��
4. detection method according to claim 1, it is characterised in that described obtain described accumulator internal resistance value R in the discharged condition by alternating current power supply1Step include:
Ac current source is is connected at described accumulator two ends1, wherein, is0(wt)=A1cos(wt), A1For current amplitude, t is the time, and w is angle;
Obtain the voltage V at described accumulator two ends1With described voltage V1With described current source is1Between angle theta1, wherein, V1(wt)=B1cos(wt-��1), B1For voltage magnitude;
According to described current source is1With voltage V1Obtain the internal resistance value R of described accumulator1, wherein, R1=V1(wt)/is1(wt)=B1/A1[cos��1+tan(wt)sin(��1)]��
5. detection method according to claim 4, it is characterised in that described obtain described accumulator internal resistance value R in the discharged condition by alternating current power supply1Step also include:
To described internal resistance value R1Carry out low-pass filtering, obtain filtered internal resistance value R1=B1/A1cos��1��
6. detection method according to claim 1, it is characterised in that according to described R0And R1The step of the health status SOH value calculating described accumulator includes:
Calculate described internal resistance value R0With described internal resistance value R1Ratio, if described ratio is more than 1, then the value giving described SOH is 1, and otherwise, the value giving described SOH is between 0 to 1, and wherein, the value of described SOH is the 1 described accumulator of expression is new battery, and otherwise, the value of described SOH represents that described accumulator is aged battery.
7. detection method according to claim 1, it is characterised in that obtain described internal resistance value R under identical conditions0With internal resistance value R1, described identical conditions includes ambient temperature residing for the dump energy of described accumulator and accumulator.
8. the detecting device of an accumulator health status, it is characterised in that including:
First module, for obtaining the internal resistance value R of accumulator by alternating current power supply0;
Second module, for obtaining described accumulator internal resistance value R in the discharged condition by alternating current power supply1;
Three module, for according to described R0And R1Calculate the health status SOH value of described accumulator.
9. detecting device according to claim 8, it is characterised in that the alternating current power supply that described first module and the second module adopt is identical alternating constant current source.
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| CN201610211242.4A CN105652215A (en) | 2016-04-07 | 2016-04-07 | Method and device for detecting SOH (state of health) of battery |
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| CN201610211242.4A CN105652215A (en) | 2016-04-07 | 2016-04-07 | Method and device for detecting SOH (state of health) of battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116500482A (en) * | 2023-06-26 | 2023-07-28 | 安徽锐能科技有限公司 | Estimation method of SOH of lithium iron phosphate battery and readable storage medium |
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