CN113900027A - Battery SOC estimation method, device, control unit and computer readable storage medium - Google Patents
Battery SOC estimation method, device, control unit and computer readable storage medium Download PDFInfo
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- CN113900027A CN113900027A CN202111165645.7A CN202111165645A CN113900027A CN 113900027 A CN113900027 A CN 113900027A CN 202111165645 A CN202111165645 A CN 202111165645A CN 113900027 A CN113900027 A CN 113900027A
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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]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
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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]
- G01R31/385—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
Abstract
The invention provides a battery SOC estimation method, a battery SOC estimation device, a control unit and a computer readable storage medium. The invention discloses a battery SOC estimation method, which comprises the steps of obtaining the current value I of a target battery at the current time under the current temperature; converting the obtained current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1(ii) a Obtaining the static SOC of the target battery at the current moment at the target temperature2(ii) a According to the static SOC2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC; and after the current value I is corrected by using the current correction parameter a, the SOC value of the battery is obtained. Because the relation between the electric quantity of the battery in the current temperature state and the electric quantity of the battery in the target temperature state is established, the electric quantity of the battery in the standing state of the target temperature is introduced as a parameter basis, after a current correction parameter is obtained, the SOC value of the battery is calculated by the corrected current valueThe method has the correction standard under the uniform temperature, and the accuracy of the SOC value of the battery is effectively improved.
Description
Technical Field
The invention relates to the technical field of battery control, in particular to a battery SOC estimation method. Meanwhile, the present invention also relates to a battery SOC estimation apparatus implementing the above battery SOC estimation method, a control unit applying the battery SOC estimation method, and a computer-readable storage medium applying the battery SOC estimation method.
Background
With the introduction of relevant policies such as carbon neutralization and carbon peak reaching in China, the development of new energy is widely concerned, and most representative new energy automobiles begin to enter the public visual field widely. The new energy automobile can be divided into a hybrid automobile, a fuel cell automobile and a pure electric automobile according to the difference of power batteries. The pure electric vehicle gradually becomes the main direction of development of new energy vehicles by virtue of the advantages of low noise, low pollution, simple structure, easiness in maintenance and the like. However, the power battery of the electric vehicle has not yet reached an ideal state at present, and becomes a key technology for restricting the development of the electric vehicle.
The performance of a power Battery is influenced by various factors such as a Battery core material, a production process and a Battery Management System, wherein an accurate and reliable Battery Management System (BMS) can maximize the function of the Battery and maintain the safety of the Battery System under the existing conditions, and is a main research direction for improving the Battery performance research at present. The State of Charge (SOC) of the battery is one of the key parameters of the BMS, and the SOC not only can reflect the Charge and discharge State of the battery, but also can provide a strategy for controlling the whole vehicle, and directly affects the utilization rate of the battery and the performance of the vehicle. However, since the SOC cannot be directly measured by the measurement device, and since the operating conditions of the battery are complicated and varied, and the voltage and current of the battery are non-linearly varied, it is very important to accurately estimate the SOC.
At present, the SOC estimation algorithm of the lithium battery commonly used at home and abroad mainly comprises a direct measurement method, a data driving method and a model foundation method. The direct measurement method is an Open-loop estimation method, and generally includes an Open-circuit voltage (OCV) method and an ampere-hour integration method. The open circuit voltage method is an estimation method provided based on the relationship between the OCV and the SOC, and a simple monotonic functional relationship is presented between the OCV and the SOC within a certain SOC range, but in actual engineering, the relationship is not a fixed and unchangeable functional relationship, so that the SOC estimation error is large. The ampere-hour integration method has high requirements on the accuracy of an initial value, and the accumulated integration error along with time is larger and larger, so that the SOC estimation accuracy is greatly reduced. The data driving method is also an open-loop estimation method, is an SOC estimation algorithm with machine learning and artificial intelligence, and can provide associative memory and good nonlinear function approximation characteristics according to self-learning and self-adaptive capacity, but the estimation result is influenced by experimental data and quality, and the data volume is large and the calculation cost is high. The simulation basic method is a closed-loop estimation method, the method simulates the internal dynamic reaction process of the lithium battery by establishing an electrochemical model or an equivalent circuit model, takes online measured real-time parameters (current, terminal voltage and temperature) of the lithium battery as the input of the equivalent model, and estimates the SOC by combining a filtering algorithm in a control theory, but the estimation precision is not ideal.
In order to reduce the influence of errors brought by current on SOC estimation precision, a related method for improving the SOC estimation precision of a battery by correcting the current value is described in the prior art, wherein in the method, a current correction coefficient of the current time of a target battery is determined mainly by obtaining the current of the current time of the target battery and according to the current of the current time of the target battery, a preset reference current of the target battery and a Pockett constant; acquiring the current battery temperature of a target battery, and determining the current temperature correction coefficient of the target battery according to the current battery temperature of the target battery and the corresponding relation between the battery temperature of the target battery and the temperature correction coefficient; and determining the current battery capacity of the target battery according to the current correction coefficient of the target battery at the current moment, the temperature correction coefficient of the target battery at the current moment and the reference capacity of the target battery. The method is mainly used for establishing the corresponding relation between the correction current and the current temperature of the battery so as to determine the correction coefficient of the current. However, the accuracy of the estimation result of the battery capacity is not high due to the non-linear temperature change rule in the use process of the battery.
Disclosure of Invention
In view of the above, the present invention is directed to a method for estimating a battery SOC to improve the accuracy of a battery SOC value.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention discloses a battery SOC estimation method, which comprises the following steps:
acquiring a current value I of a target battery at the current temperature at the current moment;
converting the obtained current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1；
Obtaining the static SOC of the target battery at the current moment at the target temperature2；
According to the static SOC2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC;
and after the current value I is corrected by using the current correction parameter a, the SOC value of the battery is obtained.
Further, the acquired current value I is converted into a current value I at the target temperature according to the relation between the battery capacity value of the target battery in the current temperature fully-discharged state and the battery capacity value of the target battery in the target temperature fully-discharged state1。
Further, converting the current value I of the target battery in the fully discharged state at the current temperature into the current value I at the target temperature by taking the ratio of the battery capacity value of the target battery in the fully discharged state at the target temperature to the current value I at the target temperature1The correction coefficient M of (1).
Further, the current value I1Obtaining the current SOC by an ampere-time integration method1。
Further, in the above-mentioned case,
therein, SOC1-tRepresenting the battery capacity value at the 1-t moment; qnIndicating the full discharge state of the target battery at the target temperatureA value of the capacity of the cell.
Further, the standing SOC is obtained according to the open-circuit voltage of the target battery at the current moment and at the target temperature2。
Further, the current correction parameter a is a static SOC2And current SOC1And a ratio of the difference Δ SOC to a battery capacity value of the target battery in a fully discharged state at the target temperature.
Further, the target temperature is 25 ℃.
The invention also provides a battery capacity estimation device, which comprises:
the acquisition module acquires the current value I of the target battery at the current temperature at the current moment and the standing SOC of the target battery at the current moment at the target temperature2；
A calculation module for converting the obtained current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1；
A processing module based on the standing SOC2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC;
and the determining module is used for determining the SOC value of the battery after correcting the current value I by using the current correction parameter a.
The invention also provides a battery SOC control unit, which comprises a processor and a memory, wherein the memory is stored with computer readable codes, and when the processor executes the computer readable codes, the battery SOC control unit executes the battery SOC estimation method.
Furthermore, the present invention also provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the steps of the method as described above.
Compared with the prior art, the invention has the following advantages:
according to the battery SOC estimation method, the relation between the electric quantity of the battery in the current temperature state and the electric quantity of the battery in the target temperature state is established, the electric quantity of the battery in the standing state of the target temperature is introduced as a parameter basis, and after a current correction parameter is obtained, the battery SOC value is calculated according to the corrected current value, so that the correction standard under the uniform temperature is achieved, and the accuracy of the battery SOC value is effectively improved.
Compared with the prior art, the battery SOC estimation device, the control unit and the computer readable storage medium have the same beneficial effects as the battery SOC estimation method, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart illustrating a method for estimating a battery SOC according to an embodiment of the present invention;
FIG. 2 is a block diagram of a battery capacity estimation apparatus according to a second embodiment of the present invention;
fig. 3 is a block diagram of a battery SOC control unit according to a third embodiment of the present invention.
Description of reference numerals:
1. an acquisition module; 2. a calculation module; 3. a processing module; 4. a determination module; 5. a processor; 6. a memory.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "mounted", "connected", and "connecting" are to be construed broadly unless expressly defined otherwise. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The present embodiment relates to a battery SOC estimation method, as shown in fig. 1, which integrally includes the steps of:
step 101, acquiring a current value I of a target battery at the current temperature at the current moment;
step 102, converting the obtained current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1；
103, acquiring the static SOC of the target battery at the current moment at the target temperature2；
Step 104, standing the SOC according to the state2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC;
and 105, correcting the current value I by using the current correction parameter a to obtain the SOC value of the battery.
According to the battery SOC estimation method, the relation between the electric quantity of the battery in the current temperature state and the electric quantity of the battery in the target temperature state is established, the electric quantity of the battery in the standing state of the target temperature is introduced as a parameter basis, and after a current correction parameter is obtained, the battery SOC value is calculated according to the corrected current value, so that the correction standard under the uniform temperature is achieved, and the accuracy of the battery SOC value is effectively improved.
In step 102, according to the relationship between the battery capacity value of the target battery in the fully discharged state at the current temperature and the battery capacity value of the target battery in the fully discharged state at the target temperature, the obtained current value I is converted into the current value I at the target temperature1. In the following description, setting the target temperature to 25 ℃ enables the results to be more accurate.
Specifically, to convert the current value to a current value I at a target temperature1The battery capacity value of the target battery in a fully discharged state at the current temperature and the fully discharged state of the target battery at the target temperature are calculatedThe ratio of the battery capacity value of the state is converted into the current value I at the target temperature as the current value I1The correction coefficient M of (1).
In order to obtain the battery capacity value of the target battery in the fully discharged state at 25 ℃, the battery capacity value C at 25 ℃ in the initial state of the target battery can be obtained first, and the actual capacity value C of the target battery at 25 ℃ can be obtained according to the SOH (percentage of the current capacity and the factory capacity) value of the battery25＝C*SOH。
Obtaining the battery capacity value of the target battery in a full discharge state at other temperatures, such as the battery capacity value C of the target battery at-20 deg.C or-10 deg.C or 0 deg.C or 45 deg.CtemAt this time, M ═ Ctem/C25。
Converting the current value I of the current target battery into the current value I of 25 ℃ based on the obtained correction coefficient M1，I1＝I*M。
By the pair I1Performing ampere-hour integration processing, calculating and obtaining the current SOC1：
Therein, SOC1-tRepresenting the battery capacity value at the 1-t moment; qnA battery capacity value representing a state in which the target battery is fully discharged at the target temperature.
Through the above steps, a battery capacity value corresponding to 25 ℃ can be obtained without current correction.
To obtain a current I1At this time, an open circuit voltage is introduced. At this time, after the target battery is left to stand for a certain time, the open-circuit voltage OCV of the target battery left to stand at 25 ℃ is obtained, and the standing SOC corresponding to the open-circuit voltage OCV is obtained according to the OCV curve2. SOC at this time2The battery capacity value is a more accurate battery capacity value under the current condition of the target battery. At this time, the SOC is left at rest2And current SOC1If there is a deviation, a current correction parameter a is set based on the difference Δ SOC.
An example of the present embodimentIn an exemplary scheme, the current correction parameter a, the difference value Δ SOC and the ratio of the battery capacity value of the target battery in a fully discharged state at 25 ℃. Specifically, the current battery capacity of the target battery at 25 ℃ is based on the current I1An accumulated volume AH obtained by integration with C obtained as above25The ratio of (a) to (b) is the battery capacity value of the target battery in a fully discharged state at 25 ℃.
Based on this, the current correction parameter a is Δ SOC/AH/C25。
Using the obtained current correction parameter a to correct the current I1Obtaining a corrected current I ═ I1(1+ a), the corrected current I is used as a final current value, and the final SOC value is calculated according to the ampere-hour integration method.
Example two
The present embodiment designs an estimation device of battery capacity, which is shown in fig. 2 and includes an acquisition module 1, a calculation module 2, a processing module 3, and a determination module 4. The obtaining module 1 obtains a current value I of a target battery at the current time under the current temperature and a standing SOC of the target battery at the current time under the target temperature2(ii) a The calculation module 2 converts the acquired current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1(ii) a The processing module 3 is based on the standing SOC2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC; the determination module 4 determines the battery SOC value after correcting the current value I by using the current correction parameter a.
EXAMPLE III
The present embodiment relates to a battery SOC control unit, as shown in fig. 3, which mainly includes a processor 5 and a memory 6, wherein the memory 6 stores a computer readable code, and when the processor 5 executes the computer readable code, the battery SOC control unit executes the battery SOC estimation method steps of the first embodiment.
Furthermore, an embodiment of the present invention relates to a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps of the battery SOC estimation method according to the first embodiment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. A battery SOC estimation method, characterized by comprising:
acquiring a current value I of a target battery at the current temperature at the current moment;
converting the obtained current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1；
Obtaining the static SOC of the target battery at the current moment at the target temperature2；
According to the static SOC2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC;
and after the current value I is corrected by using the current correction parameter a, the SOC value of the battery is obtained.
2. The battery SOC estimation method according to claim 1, characterized in that:
converting the obtained current value I into a current value I at the target temperature according to the relation between the battery capacity value of the target battery in the current temperature fully-discharged state and the battery capacity value of the target battery in the target temperature fully-discharged state1。
3. The battery SOC estimation method according to claim 2, characterized in that:
converting the ratio of the battery capacity value of the target battery in the current temperature fully-discharged state and the battery capacity value of the target battery in the target temperature fully-discharged state into a current value I at the target temperature as a current value I1The correction coefficient M of (1).
4. The battery SOC estimation method according to claim 1, characterized in that:
the current value I1Obtaining the current SOC by an ampere-time integration method1。
5. The battery SOC estimation method according to claim 4, characterized in that:
therein, SOC1-tRepresenting the battery capacity value at the 1-t moment; qnA battery capacity value representing a state in which the target battery is fully discharged at the target temperature.
6. The battery SOC estimation method according to claim 1, characterized in that:
obtaining the static SOC according to the open-circuit voltage of the target battery at the current moment at the target temperature2。
7. The battery SOC estimation method according to claim 1, characterized in that:
the current correction parameter a is a standing SOC2And current SOC1And a ratio of the difference Δ SOC to a battery capacity value of the target battery in a fully discharged state at the target temperature.
8. The battery SOC estimation method according to claim 1, characterized in that: the target temperature was 25 ℃.
9. An estimation device of a battery capacity, characterized in that the estimation device comprises:
the acquisition module (1) acquires the current value I of the target battery at the current temperature at the current moment and the standing SOC of the target battery at the current moment at the target temperature2；
A calculation module (2) for converting the acquired current value I into a current value I at a target temperature1And obtaining the current value I1Corresponding current SOC1；
A processing module (3) according to the standing SOC2And current SOC1Obtaining a current correction parameter a by the difference value delta SOC;
and the determining module (4) is used for determining the SOC value of the battery after correcting the current value I by using the current correction parameter a.
10. A battery SOC control unit characterized in that:
comprising a processor (5) and a memory (6), said memory (6) having computer readable code stored therein, said battery SOC control unit performing the battery SOC estimation method of any of claims 1-8 when said processor (5) executes said computer readable code.
11. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the steps of the method according to any one of claims 1 to 8.
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