CN113933727A - SOC correction method for limit lithium iron phosphate battery - Google Patents
SOC correction method for limit lithium iron phosphate battery Download PDFInfo
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- CN113933727A CN113933727A CN202111112932.1A CN202111112932A CN113933727A CN 113933727 A CN113933727 A CN 113933727A CN 202111112932 A CN202111112932 A CN 202111112932A CN 113933727 A CN113933727 A CN 113933727A
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- iron phosphate
- lithium iron
- phosphate battery
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000001915 proofreading effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000084490 Esenbeckia delta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a limit lithium iron phosphate battery SOC correction method, and relates to the technical field of lithium iron phosphate battery SOC. The SOC correction method of the limit lithium iron phosphate battery comprises the following steps: s1, determining the battery state: the SOC of the lithium iron phosphate battery is obtained through the battery management controller, the SOC of the lithium iron phosphate battery is actually detected through control and regulation, the actual SOC value of the lithium iron phosphate battery is recorded, and the cut-off voltage of the lithium iron phosphate battery is detected at the moment. This limit lithium iron phosphate battery SOC correction method, can be not fully filled with and carry out the effective correction of lithium iron phosphate battery's SOC under the complete discharge state many times at lithium iron phosphate battery, effectively improve the comprehensive nature of lithium iron phosphate battery's SOC correction, and then effectively calibrate lithium iron phosphate battery actual electric quantity, can effectively master battery duration simultaneously, ensure that electric automobile normally traveles, can effectively prolong lithium iron phosphate battery actual service life simultaneously, improve lithium iron phosphate battery in-service use effect.
Description
Technical Field
The invention relates to the technical field of lithium iron phosphate battery SOC, in particular to a limit lithium iron phosphate battery SOC correction method.
Background
The electric automobile is a vehicle which uses a vehicle-mounted power supply as power, uses a motor to drive wheels to run, meets various requirements of road traffic and safety regulations, has smaller influence on the environment compared with the traditional automobile, has wide prospect, the existing SOC calculation method has not perfect calculation on lithium phosphate batteries, can only correct OCV close to a fully charged part because the OCV curve of the middle section of the SOC of lithium iron phosphate is smooth and has no enough slope to provide SOC correction, but customers can not fully discharge each time in the real use process, so that the SOC can not be corrected by the OCV, can only calculate ampere-hour integration, has too single mode, can cause the error between the SOC calculated by the BMS and the real SOC of a battery pack to be larger and larger after long-time use, can cause the discharging not to be smooth and the charging not to be full, and the electric quantity of the battery pack to be smaller, has great influence on the endurance and the service life of the vehicle.
Disclosure of Invention
The invention aims to provide a limit lithium iron phosphate battery SOC correction method, which effectively solves the limitation that the current lithium iron phosphate battery can only carry out SOC correction through full charge, and further effectively improves the endurance and the service life of a vehicle.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for correcting the SOC of a limit lithium iron phosphate battery comprises the following steps:
s1, determining the battery state: acquiring the SOC of the lithium iron phosphate battery through a battery management controller, controlling and regulating the SOC of the lithium iron phosphate battery to be actually detected, recording the actual SOC value of the lithium iron phosphate battery at the moment, and detecting the cut-off voltage of the lithium iron phosphate battery at the moment;
s2, battery state adjustment: charging the lithium iron phosphate battery by a certain electric quantity through a charging pile, recording the SOC value of the charged lithium iron phosphate battery, and detecting the cut-off voltage when the charging is finished;
s3, data processing: calculating a numerical value obtained by dividing the difference value between the SOC of the lithium iron phosphate battery in the S2 and the SOC of the lithium iron phosphate battery in the S1 by the difference value between the cut-off voltage in the S2 and the cut-off voltage in the S1;
s4, acquiring multiple groups of data: repeating S2 and S3 n times, recording data obtained from S3 n times, and comparing the data until the data of the current S3 is smaller than the data of the previous S3;
s5, battery state judgment: when the data in the S4 is obtained, calculating the difference value of the SOC obtained by the calculation of the BMS and the value obtained by the calculation of the S3 at the moment, dividing the difference value by the value of the maximum capacity of the lithium iron phosphate battery, and judging;
s6, battery state correction: after the judgment of S5 is realized, the lithium iron phosphate battery is charged until the lithium iron phosphate battery is fully charged;
s7, data proofreading: and carrying out data detection processing on the lithium iron phosphate battery after 2-3 weeks.
As a further scheme of the invention: and the initial SOC is the residual capacity of the battery, and the SOC of the lithium iron phosphate battery is controlled and adjusted to be 0-50% of the maximum capacity of the lithium iron phosphate battery.
As a further scheme of the invention: according to the operation step in S2, the certain amount of electricity is Δ Q, and the cutoff voltage is V.
As a further scheme of the invention: according to the operation steps in S3, the difference between the SOC of the lithium iron phosphate battery in S2 and the SOC of the lithium iron phosphate battery in S1 is Δ Q, the difference between the cut-off voltage in S2 and the cut-off voltage in S1 is Δ V, and the value obtained by dividing the difference between the SOC of the lithium iron phosphate battery in S2 and the SOC of the lithium iron phosphate battery in S1 by the difference between the cut-off voltage in S2 and the cut-off voltage in S1 is Δ Q/Δ V.
As a further scheme of the invention: according to the operation procedure in S4, the data of this time S3 is smaller than the data of the previous time S3, i.e. delta Q/delta Vn-ΔQ/ΔVn-1＜0。
As a further scheme of the invention: the V isn-ΔQ/ΔVn-1And if the SOC of the lithium iron phosphate battery is less than 0, the SOC of the lithium iron phosphate battery is more than 50% of the maximum capacity of the lithium iron phosphate battery.
As a further scheme of the invention: according to the operation steps in the S2, the discharging efficiency of the charging pile for the lithium iron phosphate battery with a certain electric quantity is 0.5C.
As a further scheme of the invention: according to the operation step in S5, the judgment is that whether the difference value of the SOC obtained by the step S3 and the SOC calculated by the BMS is larger than 3% or not.
As a further scheme of the invention: and according to the operation step in the step S6, the charging process, namely the battery controller controls the charging columns to perform charging process on the lithium iron phosphate battery according to the SOC value calculated by the correction BMS.
As a further scheme of the invention: according to the operation steps in S7, the detection process compares whether the maximum charge capacity of the lithium iron phosphate battery at this time is consistent with the corrected maximum charge capacity of the lithium iron phosphate battery.
The invention provides a method for correcting SOC of a limit lithium iron phosphate battery. The method has the following beneficial effects:
this limit lithium iron phosphate battery SOC correction method, can be not fully filled with and carry out the effective correction of lithium iron phosphate battery's SOC under the complete discharge state many times at lithium iron phosphate battery, effectively improve the comprehensive nature of lithium iron phosphate battery's SOC correction, and then effectively calibrate lithium iron phosphate battery actual electric quantity, can effectively master battery duration simultaneously, ensure that electric automobile normally traveles, can effectively prolong lithium iron phosphate battery actual service life simultaneously, improve lithium iron phosphate battery in-service use effect.
Drawings
FIG. 1 is a SOC-OCV graph of the present invention;
FIG. 2 is a SOC-dQ/dV graph of the present invention;
FIG. 3 is a flow chart of the present invention.
Detailed Description
The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.
Specifically, according to the operation steps in the step one, the initial SOC is the residual capacity of the battery, and the SOC of the lithium iron phosphate battery is controlled and adjusted to be 0-50% of the maximum capacity of the lithium iron phosphate battery.
Specifically, according to the operation steps in the second step, the certain electric quantity is Δ Q, and the cutoff voltage is V.
Specifically, according to the operation steps in the third step, the difference between the SOC of the lithium iron phosphate battery in the second step and the SOC of the lithium iron phosphate battery in the first step is Δ Q, and the difference between the cut-off voltage in the second step and the cut-off voltage in the first step is Δ V, i.e., the value obtained by dividing the difference between the SOC of the lithium iron phosphate battery in the second step and the SOC of the lithium iron phosphate battery in the first step by the difference between the cut-off voltage in the second step and the cut-off voltage in the first step is Δ Q/Δ V.
Specifically, according to the operation steps in the fourth step, the data in the third step is smaller than the data in the third step, i.e. Δ Q/Δ Vn-ΔQ/ΔVn-1＜0。
Specifically,. DELTA.Q/Vn-ΔQ/ΔVn-1And if the SOC of the lithium iron phosphate battery is less than 0, the SOC of the lithium iron phosphate battery is more than 50% of the maximum capacity of the lithium iron phosphate battery.
Specifically, according to the operation steps in the second step, the discharging efficiency of the charging pile for carrying out certain electric quantity on the lithium iron phosphate battery is 0.5C.
Specifically, according to the operation steps in the fifth step, whether the value obtained in the third step and the value obtained by the BMS calculation and obtained by dividing the difference value of the SOC by the maximum capacity of the lithium iron phosphate battery is more than 3% is judged.
Specifically, according to the operation steps in the sixth step, the charging process is that the battery controller controls the charging column to charge the lithium iron phosphate battery according to the SOC value calculated by the modified BMS.
Specifically, according to the operation steps in the seventh step, the detection processing is performed to determine whether the maximum charge capacity of the lithium iron phosphate battery at this time is consistent with the corrected maximum charge capacity of the lithium iron phosphate battery.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. A limit lithium iron phosphate battery SOC correction method is characterized by comprising the following steps:
s1, determining the battery state: acquiring the SOC of the lithium iron phosphate battery through a battery management controller, controlling and regulating the SOC of the lithium iron phosphate battery to be actually detected, recording the actual SOC value of the lithium iron phosphate battery at the moment, and detecting the cut-off voltage of the lithium iron phosphate battery at the moment;
s2, battery state adjustment: charging the lithium iron phosphate battery by a certain electric quantity through a charging pile, recording the SOC value of the charged lithium iron phosphate battery, and detecting the cut-off voltage when the charging is finished;
s3, data processing: calculating a numerical value obtained by dividing the difference value between the SOC of the lithium iron phosphate battery in the S2 and the SOC of the lithium iron phosphate battery in the S1 by the difference value between the cut-off voltage in the S2 and the cut-off voltage in the S1;
s4, acquiring multiple groups of data: repeating S2 and S3 n times, recording data obtained from S3 n times, and comparing the data until the data of the current S3 is smaller than the data of the previous S3;
s5, battery state judgment: when the data in the S4 is obtained, calculating the difference value of the SOC obtained by the calculation of the BMS and the value obtained by the calculation of the S3 at the moment, dividing the difference value by the value of the maximum capacity of the lithium iron phosphate battery, and judging;
s6, battery state correction: after the judgment of S5 is realized, the lithium iron phosphate battery is charged until the lithium iron phosphate battery is fully charged;
s7, data proofreading: and carrying out data detection processing on the lithium iron phosphate battery after 2-3 weeks.
2. The method for correcting the SOC of the lithium iron phosphate battery as claimed in claim 1, wherein the controlling adjusts the SOC of the lithium iron phosphate battery to 0-50% of the maximum capacity of the lithium iron phosphate battery according to the operation procedure of S1, wherein the initial SOC is the remaining capacity of the battery.
3. The method for correcting the SOC of a lithium iron phosphate battery as claimed in claim 2, wherein the certain charge is Δ Q and the cut-off voltage is V according to the operation procedure in S2.
4. The method for correcting the SOC of a lithium iron phosphate battery as claimed in claim 3, wherein the difference between the SOC of the lithium iron phosphate battery in S2 and the SOC of the lithium iron phosphate battery in S1 is Δ Q, and the difference between the cut-off voltage in S2 and the cut-off voltage in S1 is Δ V, i.e. the difference between the SOC of the lithium iron phosphate battery in S2 and the SOC of the lithium iron phosphate battery in S1 divided by the difference between the cut-off voltage in S2 and the cut-off voltage in S1 is Δ Q/Δ V according to the operation procedure in S3.
5. The method for correcting SOC of lithium iron phosphate battery according to claim 4, wherein the data of this time S3 is smaller than the data of the previous time S3, i.e. Δ Q/Δ V, according to the operation procedure of S4n-ΔQ/ΔVn-1＜0。
6. The method for correcting SOC of lithium iron phosphate battery as claimed in claim 5, wherein V is selected from the group consisting ofn-ΔQ/ΔVn-1If the SOC of the lithium iron phosphate battery is less than 0, the SOC of the lithium iron phosphate battery is greater than the maximum capacity of the lithium iron phosphate battery50% of the total.
7. The method for correcting the SOC of an extreme lithium iron phosphate battery according to claim 6, wherein the charging pile discharges the lithium iron phosphate battery with a certain amount of electricity at an efficiency of 0.5C according to the operation procedure in S2.
8. The method for correcting the SOC of a lithium iron phosphate battery as claimed in claim 7, wherein the determination is made whether the difference between the SOC calculated by the BMS and the value obtained by S3 is greater than 3% or not according to the operation procedure of S5.
9. The method for correcting the SOC of a lithium iron phosphate battery as claimed in claim 8, wherein the charging process means that the battery controller controls the charging columns to perform the charging process for the lithium iron phosphate battery according to the SOC value calculated by the correction BMS according to the operation procedure of S6.
10. The method for correcting SOC of a lithium iron phosphate battery as claimed in claim 9, wherein the detecting process compares whether the maximum charging amount of the lithium iron phosphate battery at this time is consistent with the maximum charging amount of the lithium iron phosphate battery after correction according to the operation procedure in S7.
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| CN202111112932.1A CN113933727A (en) | 2021-09-23 | 2021-09-23 | SOC correction method for limit lithium iron phosphate battery |
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| CN202111112932.1A CN113933727A (en) | 2021-09-23 | 2021-09-23 | SOC correction method for limit lithium iron phosphate battery |
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2021
- 2021-09-23 CN CN202111112932.1A patent/CN113933727A/en active Pending
Patent Citations (9)
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| CN102540096A (en) * | 2012-01-17 | 2012-07-04 | 浙江大学 | Self-correction method for remaining capacity estimation of lithium iron phosphate power battery |
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Effective date of registration: 20220623 Address after: 411 Jianye Road, Pudong New Area, Shanghai 201201 Applicant after: HELLA SHANGHAI ELECTRONICS Co.,Ltd. Address before: 225000 room 1-361, No. 20, Chuangye Road, Guangling District, Yangzhou City, Jiangsu Province Applicant before: Hengda Haila Electronics (Yangzhou) Co.,Ltd. |
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