CN112363057A - Estimation method for improving SOC precision and battery management system - Google Patents
Estimation method for improving SOC precision and battery management system Download PDFInfo
- Publication number
- CN112363057A CN112363057A CN202010998013.8A CN202010998013A CN112363057A CN 112363057 A CN112363057 A CN 112363057A CN 202010998013 A CN202010998013 A CN 202010998013A CN 112363057 A CN112363057 A CN 112363057A
- Authority
- CN
- China
- Prior art keywords
- battery
- soc
- current
- current value
- capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001351 cycling effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The application relates to an estimation method for improving SOC precision and a battery management system, which are applied to the battery management system, wherein the method comprises the following steps: acquiring the current temperature, the current value and the cycle number of the battery; searching a correction weight table of the battery management system according to the current temperature, the current value and the cycle number to obtain a weight factor; and correcting the current value according to the weight factor, and calculating the SOC value according to the corrected current value. The beneficial effect of this application is: the current is corrected by acquiring the current temperature and the current value of the battery, so that errors caused by the change of the battery capacity are avoided, and the estimation precision is effectively improved.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and more particularly, to an estimation method for improving SOC accuracy and a battery management system.
Background
The characteristics of the lithium ion battery determine the capacity quality of the lithium ion battery, and the difference of available capacities corresponding to different temperature, multiplying power and aging conditions is large, which brings great difficulty to the estimation of the residual capacity (SOC) of a battery system under complex external environment and working condition in the actual application process.
The variable battery system capacity is very unfavorable for estimating the system SOC, the accumulated error of pure current integration is larger along with the operation of the system, high-end intelligent equipment usually adopts a high-level complex algorithm to solve the problem, low-end low-cost equipment conventionally intervenes by matching with a high-end or low-end voltage characteristic point, but the method usually causes the change of the SOC to be indefinite, and a large SOC change range is caused by triggering voltage correction when low-current charging and discharging is possible, for example, the SOC is quickly corrected to 100% or 0%, so that the estimated SOC cannot safely and scientifically guide a user to use an electric appliance, and brings very poor use feeling to the user, and the SOC is considered to be unreliable.
Disclosure of Invention
In order to solve the problem that the available capacity corresponding to different temperature, multiplying power and aging conditions in the prior art is large in difference, the application provides an estimation method for improving SOC precision and a battery management system.
An estimation method for improving SOC accuracy is applied to a battery management system, and comprises the following steps:
acquiring the current temperature, the current value and the cycle number of the battery;
searching a correction weight table of the battery management system according to the current temperature, the current value and the cycle number to obtain a weight factor;
and correcting the current value according to the weight factor, and calculating the SOC value according to the corrected current value.
Optionally, the correction weight table is obtained by:
carrying out cycle test on the battery to obtain a battery charge and discharge capacity meter;
taking the standard charge-discharge capacity of a battery as a reference capacity, and acquiring a correction weight table according to the ratio of the battery charge-discharge capacity table to the reference capacity;
and the ratio of the battery charge-discharge capacity meter to the reference capacity is a weight factor.
Optionally, the performing a cycle test on the battery to obtain the battery charge-discharge capacity meter includes:
acquiring a standard working range of the battery;
setting different temperatures and different current multiplying powers according to the standard working range;
and carrying out charge and discharge tests on the battery at different temperatures and different current multiplying powers to obtain the charge and discharge capacity of the battery under different test conditions.
Optionally, the obtaining a battery charge-discharge capacity table includes:
and manufacturing a battery charge-discharge capacity meter according to the battery charge-discharge capacities corresponding to different temperatures and different current multiplying powers.
Optionally, the number of tests for performing the cycle test on the battery is greater than 100.
Optionally, the modifying the current value according to the weighting factor includes:
and obtaining a reference current value by calculating the product of the current value and the weighting factor.
Optionally, the calculating an SOC value according to the corrected current value includes:
integrating the reference current value to calculate the current residual electric quantity;
and calculating the SOC value according to the integrated reference current value and the reference capacity.
Optionally, the SOC value is calculated according to the integrated reference current value and the reference capacity, and a formula of the SOC value is as follows:
therein, SOCt-1Is the percentage of the remaining capacity, SOC, at the previous momenttIs left for the presentPercentage of residual electric quantity, Qt: the current battery residual capacity; qreal: the base capacity of the battery.
Optionally, the acquiring the current temperature, the current value, and the cycle number of the battery includes:
acquiring the current temperature through a temperature sensor arranged in a battery management system;
obtaining a current value through a current acquisition end connected to the battery;
and reading the stored cycle number of the battery management system, and acquiring the cycle number.
In addition, the battery management system comprises the estimation method for improving the SOC accuracy.
Compared with the prior art, the beneficial effects of this application are: the current is corrected by acquiring the current temperature and the current value of the battery, so that errors caused by the change of the battery capacity are avoided, and the estimation precision is effectively improved.
Drawings
Fig. 1 is a schematic diagram of a method according to an embodiment of the present application.
Detailed Description
The present application will be further described with reference to the following detailed description.
The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, if any, are used in the orientations and positional relationships indicated in the drawings only for the convenience of describing the present application and for simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore the terms describing the positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Furthermore, if the terms "first," "second," and the like are used for descriptive purposes only, they are used for mainly distinguishing different devices, elements or components (the specific types and configurations may be the same or different), and they are not used for indicating or implying relative importance or quantity among the devices, elements or components, but are not to be construed as indicating or implying relative importance.
In the embodiment shown in fig. 1, the present application provides an estimation method for improving SOC accuracy, which is applied to a battery management system, and the method includes:
100, acquiring the current temperature, the current value and the cycle number of the battery; in step 100, obtaining the current temperature, the current value, and the cycle number of the battery includes: acquiring the current temperature through a temperature sensor arranged in a battery management system; obtaining a current value through a current acquisition end connected to the battery; and reading the stored cycle number of the battery management system, and acquiring the cycle number.
200, searching a correction weight table of the battery management system according to the current temperature, the current value and the cycle number to obtain a weight factor; in step 200, the correction weight table is obtained by: carrying out cycle test on the battery to obtain a battery charge and discharge capacity meter; taking the standard charge-discharge capacity of the battery as a reference capacity, and acquiring a correction weight table according to the ratio of the battery charge-discharge capacity table to the reference capacity; and the ratio of the battery charge-discharge capacity meter to the reference capacity is a weight factor. After the current temperature, the current value and the cycle number are obtained, the current temperature, the current value and the cycle number are used as indexes, and the weighting factors corresponding to the current temperature, the current value and the cycle number are searched.
And 300, correcting the current value according to the weighting factor, and calculating the SOC value according to the corrected current value. In step 300, modifying the current value according to the weighting factor includes: the reference current value is obtained by calculating the product of the current value and the weighting factor. Calculating the SOC value according to the corrected current value, comprising the following steps: integrating the reference current value; and calculating the SOC value according to the integrated reference current value and the reference capacity.
The current is corrected by acquiring the current temperature and the current value of the battery, so that errors caused by the change of the battery capacity are avoided, and the estimation precision is effectively improved.
In some embodiments, the revised weight table is obtained by:
carrying out cycle test on the battery to obtain a battery charge and discharge capacity meter; in the embodiment, the standard working range of the battery is obtained; setting different temperatures and different current multiplying powers according to the standard working range; and carrying out charge and discharge tests on the battery at different temperatures and different current multiplying powers to obtain the charge and discharge capacity of the battery under different test conditions. And manufacturing a battery charge-discharge capacity meter according to the battery charge-discharge capacities corresponding to different temperatures and different current multiplying powers.
Taking the standard charge-discharge capacity of the battery as a reference capacity, and acquiring a correction weight table according to the ratio of the battery charge-discharge capacity table to the reference capacity; in this embodiment, each battery charge-discharge capacity of the battery charge-discharge capacity table is compared with the reference accommodation, and the ratio of the battery charge-discharge capacity table to the reference capacity is obtained as the weighting factor.
In some embodiments, the cycle testing of the battery to obtain the battery charge-discharge capacity table includes:
acquiring a standard working range of the battery; in this embodiment, the standard operating range of the battery is set by the battery specification and the actual usage scenario of the battery. The standard operating range includes a temperature range and a current range.
Setting different temperatures and different current multiplying powers according to the standard working range; and carrying out charge and discharge tests on the battery at different temperatures and different current multiplying powers to obtain the charge and discharge capacity of the battery under different test conditions. In this embodiment, in the standard working range of the battery, a one-by-one traversal test is performed on each temperature point and current point in the temperature range and current range, and the battery charge-discharge capacity corresponding to each temperature point and current point is obtained.
In some embodiments, obtaining a battery charge-discharge capacity table comprises: and manufacturing a battery charge-discharge capacity meter according to the battery charge-discharge capacities corresponding to different temperatures and different current multiplying powers. Referring to the following table, Capacity is battery charge and discharge Capacity, Temp is temperature, Cycles number cycle, current rate is current multiplying power, and Factor is weight Factor. Wherein, table 1 is a battery charge and discharge capacity table, and table 2 is a correction weight table.
TABLE 1
TABLE 2
In some embodiments, the number of tests performed to cycle the battery is greater than 100. In the application, the cycle test of the battery can be a cycle test of the same battery, and can also be a cycle test of a plurality of times without batteries; and averaging the charge and discharge capacities of the batteries under the same test conditions and the same cycle number.
In some embodiments, modifying the current value according to the weighting factor includes: the reference current value is obtained by calculating the product of the current value and the weighting factor. In this embodiment, the SOC is calculated by a reference current value, which is obtained by multiplying the current value by the weighting factor.
In some embodiments, calculating the SOC value from the modified current value includes: integrating the reference current value; qt＝Qt-1+∫Idt；
Wherein the above formula is a calculation formula of battery charging, Qt-1The amount of electricity at the last moment, QtIs the current electric quantity, t is the time interval; the time interval can be set according to the system, and in this embodiment, the time interval is 100 ms. Similarly, the calculation formula of battery discharge is as follows: qt＝Qt-1-∫Idt。
In some embodiments, the SOC value is calculated based on the integrated reference current value and the reference capacity.
Wherein the above formula is a calculation formula of battery charging, SOCt-1Is the percentage of the remaining capacity, SOC, at the previous momenttAs a percentage of the current remaining capacity, Qt: the current battery residual capacity; qreal: the reference capacity of the battery. Similarly, the formula for calculating the discharge is as follows:
in some embodiments, obtaining the current temperature, the current value, and the number of cycles of the battery includes: acquiring the current temperature through a temperature sensor arranged in a battery management system; obtaining a current value through a current acquisition end connected to the battery; and reading the stored cycle number of the battery management system, and acquiring the cycle number. In the embodiment, the current temperature, the current value and the cycle number can be obtained through a battery management system, wherein the current temperature is obtained through a temperature sensor, the current value is obtained through a current test chip, and the cycle number is obtained by reading a counter of the battery management chip; when the battery is charged and discharged every time, the battery management system counts every charging and discharging.
In some embodiments, the present application provides a battery management system including an estimation method for improving SOC accuracy as described above. The current is corrected by acquiring the current temperature and the current value of the battery, so that errors caused by the change of the battery capacity are avoided, and the estimation precision is effectively improved.
It should be understood that the above examples of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims (10)
1. An estimation method for improving SOC accuracy, applied to a battery management system, the method comprising:
acquiring the current temperature, the current value and the cycle number of the battery;
searching a correction weight table of the battery management system according to the current temperature, the current value and the cycle number to obtain a weight factor;
and correcting the current value according to the weight factor, and calculating the SOC value according to the corrected current value.
2. The estimation method for improving accuracy of SOC according to claim 1, wherein the correction weight table is obtained by:
carrying out cycle test on the battery to obtain a battery charge and discharge capacity meter;
taking the standard charge-discharge capacity of a battery as a reference capacity, and acquiring a correction weight table according to the ratio of the battery charge-discharge capacity table to the reference capacity;
and the ratio of the battery charge-discharge capacity meter to the reference capacity is a weight factor.
3. The estimation method for improving the accuracy of the SOC according to claim 2, wherein the performing a cycle test on the battery to obtain the battery charge/discharge capacity table includes:
acquiring a standard working range of the battery;
setting different temperatures and different current multiplying powers according to the standard working range;
and carrying out charge and discharge tests on the battery at different temperatures and different current multiplying powers to obtain the charge and discharge capacity of the battery under different test conditions.
4. The estimation method for improving the SOC accuracy according to claim 3, wherein the obtaining the battery charge-discharge capacity table comprises:
and manufacturing a battery charge-discharge capacity meter according to the battery charge-discharge capacities corresponding to different temperatures and different current multiplying powers.
5. The estimation method for improving accuracy of SOC of claim 3, wherein the number of tests for cycling the battery is more than 100.
6. The estimation method for improving accuracy of SOC according to claim 2, wherein the modifying the current value according to the weighting factor includes:
and obtaining a reference current value by calculating the product of the current value and the weighting factor.
7. The estimation method for improving SOC accuracy according to claim 6, wherein the calculating SOC value based on the corrected current value comprises:
integrating the reference current value to calculate the current residual electric quantity;
and calculating the SOC value according to the integrated reference current value and the reference capacity.
8. The estimation method for improving SOC accuracy according to claim 7, wherein the SOC value is calculated based on the integrated reference current value and the reference capacity, and the formula is:
therein, SOCt-1Is the percentage of the remaining capacity, SOC, at the previous momenttAs a percentage of the current remaining capacity, Qt: the current battery residual capacity; qreal: the base capacity of the battery.
9. The estimation method for improving the accuracy of SOC according to claim 1, wherein the obtaining of the current temperature, the current value, and the number of cycles of the battery includes:
acquiring the current temperature through a temperature sensor arranged in a battery management system;
obtaining a current value through a current acquisition end connected to the battery;
and reading the stored cycle number of the battery management system, and acquiring the cycle number.
10. A battery management system comprising an estimation method of improving SOC accuracy according to claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010998013.8A CN112363057A (en) | 2020-09-21 | 2020-09-21 | Estimation method for improving SOC precision and battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010998013.8A CN112363057A (en) | 2020-09-21 | 2020-09-21 | Estimation method for improving SOC precision and battery management system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112363057A true CN112363057A (en) | 2021-02-12 |
Family
ID=74516390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010998013.8A Pending CN112363057A (en) | 2020-09-21 | 2020-09-21 | Estimation method for improving SOC precision and battery management system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112363057A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900027A (en) * | 2021-09-30 | 2022-01-07 | 蜂巢能源科技有限公司 | Battery SOC estimation method, device, control unit and computer readable storage medium |
| CN114740362A (en) * | 2022-04-13 | 2022-07-12 | 重庆标能瑞源储能技术研究院有限公司 | BMS-based current sampling self-learning method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738820A (en) * | 2016-02-05 | 2016-07-06 | 惠州市蓝微新源技术有限公司 | Method of correcting state of charge (SOC) based on battery discharge characteristic curves and ampere-hour integral method |
| CN109870655A (en) * | 2019-03-26 | 2019-06-11 | 上海工程技术大学 | A kind of evaluation method for lithium battery SOC |
-
2020
- 2020-09-21 CN CN202010998013.8A patent/CN112363057A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738820A (en) * | 2016-02-05 | 2016-07-06 | 惠州市蓝微新源技术有限公司 | Method of correcting state of charge (SOC) based on battery discharge characteristic curves and ampere-hour integral method |
| CN109870655A (en) * | 2019-03-26 | 2019-06-11 | 上海工程技术大学 | A kind of evaluation method for lithium battery SOC |
Non-Patent Citations (1)
| Title |
|---|
| 张维戈: "电动汽车工程手册", 30 November 2019, 机械工业出版社, pages: 86 - 87 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900027A (en) * | 2021-09-30 | 2022-01-07 | 蜂巢能源科技有限公司 | Battery SOC estimation method, device, control unit and computer readable storage medium |
| CN113900027B (en) * | 2021-09-30 | 2023-06-30 | 蜂巢能源科技有限公司 | Battery SOC estimation method, device, control unit and computer readable storage medium |
| CN114740362A (en) * | 2022-04-13 | 2022-07-12 | 重庆标能瑞源储能技术研究院有限公司 | BMS-based current sampling self-learning method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111448468B (en) | Method, device and system for detecting consistency of battery pack | |
| CN107991623B (en) | Battery ampere-hour integral SOC estimation method considering temperature and aging degree | |
| CN107843852B (en) | A method of off-line data is obtained to estimate battery united state | |
| EP3433628B1 (en) | An energy storage device monitoring technique | |
| CN108132442A (en) | A kind of accumulator united state evaluation method based on off-line data driving | |
| US20160069963A1 (en) | Electricity storage device state inference method | |
| WO2015106691A1 (en) | Soc estimation method for power battery for hybrid electric vehicle | |
| CN107664751A (en) | The measuring method and measuring and calculating device of a kind of real-time state-of-charge of battery | |
| CN103884991A (en) | Test method for single body cell DC internal resistance | |
| CN107942261B (en) | Method and system for estimating state of charge of battery | |
| CN110386029A (en) | It is a kind of that lithium battery SOC method is corrected according to dynamic electric voltage | |
| CN110118944A (en) | The estimating system and method for cell health state | |
| CN112363057A (en) | Estimation method for improving SOC precision and battery management system | |
| CN113777501B (en) | SOH estimation method of battery module | |
| CN111896882A (en) | Battery capacity determination method and device and vehicle | |
| CN111216595B (en) | SOC calibration method of severe hybrid electric vehicle based on lithium battery equivalent circuit model | |
| CN113009346A (en) | Battery system and SOC value correction method thereof | |
| CN111965557A (en) | Backup power reliability assessment method and device | |
| CN116930794A (en) | Battery capacity updating method and device, electronic equipment and storage medium | |
| CN116930779A (en) | Battery capacity determining method and device, storage medium, and battery | |
| CN112394290B (en) | Method, device, computer equipment and storage medium for estimating SOH of battery pack | |
| JP2011172415A (en) | Secondary battery device | |
| CN112014751B (en) | SOC estimation method based on estimation of actual dischargeable capacity of lithium ion battery | |
| KR100911315B1 (en) | Apparatus and method for estimating battery's resistance characteristics based on open circuit voltage estimated by battery voltage variation pattern | |
| JP5772737B2 (en) | Total battery capacity estimation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |