CN117590262A - BMS product battery internal resistance self-adaptive measurement method - Google Patents
BMS product battery internal resistance self-adaptive measurement method Download PDFInfo
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- CN117590262A CN117590262A CN202311612305.3A CN202311612305A CN117590262A CN 117590262 A CN117590262 A CN 117590262A CN 202311612305 A CN202311612305 A CN 202311612305A CN 117590262 A CN117590262 A CN 117590262A
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- 238000000691 measurement method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 230000002045 lasting effect Effects 0.000 claims description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- 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]
-
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- 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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
-
- 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
-
- 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
-
- 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 discloses a battery internal resistance self-adaptive measurement method for a BMS product, and belongs to the technical field of battery internal resistance measurement. The method comprises the following steps: after a BMS product is kept stand for a certain time threshold, detecting the minimum single-string voltage of the BMS product; when the minimum single-string voltage of the BMS product meets a set voltage threshold range, carrying out heavy current discharge on the BMS product; detecting a current value in the large-current discharging process, and recording the current battery voltage value as an initial voltage when the current value reaches a set current threshold value; recording the voltage value of the battery after the heavy current discharge process is finished as the termination voltage; and obtaining a difference value between the termination voltage and the initial voltage, and calculating the internal resistance value of the BMS product according to the difference value. By the method, the accuracy of battery internal resistance measurement of the BMS product is improved.
Description
Technical Field
The invention relates to the technical field of battery internal resistance measurement, in particular to a battery internal resistance self-adaptive measurement method for a BMS product.
Background
There is a certain relation between the service life of the battery and the internal resistance, and the magnitude of the internal resistance has a great influence on the capacity and discharge performance of the battery, thereby influencing the service life of the battery. The on-line monitoring of internal resistance plays a very important role in grasping the state of health of the battery and predictive maintenance in real time.
The conventional measurement method is to perform polarization discharge or pulse discharge on the battery pack through an instrument, and calculate the internal resistance of the battery pack by measuring the voltage change of the battery pack in the discharge process.
However, the internal resistance value can only be measured before the battery leaves the factory, and the internal resistance of the battery can not be dynamically measured in the actual use process of the BMS product, and the internal resistance of the battery can be changed along with the use aging of the battery.
Therefore, how to realize the dynamic measurement of the internal resistance of the battery during the use of the BMS product is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a self-adaptive measurement method for the internal resistance of a battery of a BMS product, which is used for dynamically measuring the internal resistance of the battery in the use process of the BMS product.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the self-adaptive measurement method for the internal resistance of the battery of the BMS product is characterized by comprising the following steps of:
standing the BMS product;
detecting the minimum single-string voltage of the BMS product after the standing time reaches a set time threshold;
when the minimum single-string voltage of the BMS product meets a set voltage threshold range, carrying out heavy current discharge on the BMS product;
detecting a current value of a BMS product in a large-current discharging process, judging the current value, and obtaining a termination voltage and a termination current;
and obtaining a difference value between the termination voltage and the initial voltage, and calculating the internal resistance value of the BMS product according to the difference value and the termination current.
Further, detecting a current value of the BMS product and judging the current value in a large-current discharging process to obtain a termination voltage and a termination current, and specifically comprising:
acquiring a current value of a detected BMS product in a large-current discharging process;
when the current value meets a set current initial threshold value, recording the battery voltage value of the current BMS product as an initial voltage;
when the current value does not meet the set current starting threshold, further judging whether the current value meets the set current ending threshold, and if the current value meets the set current ending threshold, recording the battery voltage value and the current value of the BMS product as ending voltage and ending current.
Further, the set time threshold includes 5min or more.
Further, the minimum single string voltage of the BMS product satisfies a set voltage threshold range, specifically including the minimum single string voltage being greater than 3200MV and less than 3350MV.
Further, the current value meets a set current start threshold, specifically including that the current value I meets-5 a < I <0a.
Further, determining whether the current value meets a set current termination threshold value specifically includes:
and judging whether the current value meets I < -0.5C, wherein C represents the nominal capacity of the battery of the BMS product.
Further, calculating the internal resistance value of the BMS product according to the difference value specifically includes adopting the following calculation formula: r=Δu/I Stop for vehicle Wherein R represents the internal resistance value of the BMS product; Δu represents the difference between the end voltage and the start voltage; i Stop for vehicle Indicating the termination current value.
Further, the internal resistance measurement ends when any one of the following conditions is satisfied:
a: a charging current is present;
b: the minimum single string voltage Vmin is greater than or equal to 3350MV;
c: the minimum single string voltage Vmin is less than or equal to 3200MV and the discharge current I is less than or equal to 5A;
d: the discharge current I satisfies: -0.5c < i < -5A and lasting 3S.
Compared with the prior art, the invention discloses the self-adaptive measurement method for the internal resistance of the battery of the BMS product, which has the following beneficial effects:
according to the invention, the initial voltage value, the final voltage value and the current value of the battery can be acquired by the BMS, the internal resistance value of the battery can be accurately calculated, and the internal resistance value is dynamically updated in the use process of the BMS, so that the obtained internal resistance value can be used for dynamically updating the internal resistance parameter of the battery in the SOC algorithm, and the accuracy of estimating the SOC of the battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall flow chart of a battery internal resistance self-adaptive measurement method for a BMS product provided by the invention.
Fig. 2 is a schematic diagram of an implementation flow of a method for adaptively measuring internal resistance of a battery of a BMS product according to an embodiment of the present invention
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention discloses a battery internal resistance self-adaptive measurement method for a BMS product, which comprises the following steps:
standing the BMS product;
detecting the minimum single-string voltage of the BMS product after the standing time reaches a set time threshold;
when the minimum single-string voltage of the BMS product meets a set voltage threshold range, carrying out heavy current discharge on the BMS product;
detecting a current value of the BMS product and judging the current value in a large-current discharging process to obtain a termination voltage and a termination current of the BMS product, and specifically:
when the current value meets a set current initial threshold value, recording the battery voltage value of the current BMS product as an initial voltage;
when the current value does not meet the set current starting threshold, further judging whether the current value meets the set current ending threshold, and if the current value meets the set current ending threshold, recording the battery voltage value and the current value of the BMS product as ending voltage and ending current;
and obtaining a difference value between the termination voltage and the initial voltage, and calculating the internal resistance value of the BMS product according to the difference value and the termination current.
In one embodiment, as shown in fig. 2, the BMS product is formed by serially connecting a plurality of strings of batteries, the BMS product is firstly stood, and when the standing time is more than 5min, the battery reaches an equilibrium state, and the minimum single string voltage V of the BMS product is detected min (i.e. the voltage value of the lowest voltage string among all strings) when the minimum single string voltage V min When the discharge current is more than 3200MV and less than 3350MV, carrying out heavy current discharge on the BMS product and acquiring a current value, and when the discharge current value I meets-5A<I<When 0A, the current battery voltage value is updated in real time and recorded as the initial voltage U Starting from the beginning If the current value does not match-5A<I<0A, the current is further determined, when I<-recording the voltage and current values at 0.5C asFor termination voltage U Stop for vehicle And terminating the current I Stop for vehicle Otherwise, the internal resistance measurement is ended, thereby obtaining a difference Δu=u between the end voltage and the start voltage Stop for vehicle -U Starting from the beginning Formula r=Δu/I using ohm's law Stop for vehicle And calculating to obtain the internal resistance value of the battery.
In the above embodiment, the BMS product internal resistance measurement start conditions are as follows, and measurement starts when all of the following conditions are satisfied:
a: the BMS is in a resting state for more than 5 minutes;
b: minimum single string voltage V min Greater than 3200MV and less than 3350MV.
The measurement end conditions are as follows, and the internal resistance measurement ends when any one of the following conditions is satisfied:
a: a charging current is present;
b: minimum single string voltage V min Greater than or equal to 3350MV;
c: minimum single string voltage V min Less than or equal to 3200MV and discharge current I less than or equal to 5A;
d: -0.5c < i < -5A for 3S.
The measurement result effective conditions are as follows, and the measurement result is effective when all of the following conditions are satisfied:
a: the discharge current is greater than or equal to 0.5C, where 0.5C refers to a current that is 0.5 times the battery capacity;
b: measuring that the starting voltage is greater than the ending voltage;
c: the internal resistance is not more than + -50% of the standard internal resistance.
The method is used for automatically measuring the internal resistance value of the battery and dynamically updating the internal resistance value in the use process of the BMS, and the obtained internal resistance value can be used for dynamically updating the internal resistance parameter of the battery in the SOC algorithm, so that the accuracy of estimating the SOC of the battery is improved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The self-adaptive measurement method for the internal resistance of the battery of the BMS product is characterized by comprising the following steps of:
standing the BMS product;
detecting the minimum single-string voltage of the BMS product after the standing time reaches a set time threshold;
when the minimum single-string voltage of the BMS product meets a set voltage threshold range, carrying out heavy current discharge on the BMS product;
detecting a current value of a BMS product in a large-current discharging process, judging the current value, and obtaining a termination voltage and a termination current;
and obtaining a difference value between the termination voltage and the initial voltage, and calculating the internal resistance value of the BMS product according to the difference value and the termination current.
2. The self-adaptive measurement method of the internal resistance of the battery of the BMS product according to claim 1, wherein the method comprises the steps of detecting the current value of the BMS product and judging the current value in the process of discharging a large current to obtain a termination voltage and a termination current, and specifically comprises the following steps:
acquiring a current value of a detected BMS product in a large-current discharging process;
when the current value meets a set current initial threshold value, recording the battery voltage value of the current BMS product as an initial voltage;
when the current value does not meet the set current starting threshold, further judging whether the current value meets the set current ending threshold, and if the current value meets the set current ending threshold, recording the battery voltage value and the current value of the BMS product as ending voltage and ending current.
3. The method for adaptively measuring the internal resistance of a battery of a BMS product according to claim 1, wherein the set time threshold value comprises 5min or more.
4. The method for adaptively measuring the internal resistance of a battery of a BMS product according to claim 1, wherein the minimum single string voltage of the BMS product meets a set voltage threshold range, and specifically comprises that the minimum single string voltage is greater than 3200MV and less than 3350MV.
5. The self-adaptive measurement method of the internal resistance of the battery of the BMS product according to claim 2, wherein the current value meets a set current starting threshold, and specifically comprises that the current value I meets-5A < I <0A.
6. The method for adaptively measuring the internal resistance of a battery of a BMS product according to claim 2, wherein determining whether the current value satisfies a set current termination threshold value comprises:
and judging whether the current value meets I < -0.5C, wherein C represents the nominal capacity of the battery of the BMS product.
7. The method for adaptively measuring the internal resistance of a battery of a BMS product according to claim 1, wherein calculating the internal resistance value of the BMS product according to the difference value comprises the following steps: r=Δu/I Stop for vehicle Wherein R represents the internal resistance value of the BMS product; Δu represents the difference between the end voltage and the start voltage; i Stop for vehicle Indicating the termination current value.
8. The method for adaptively measuring the internal resistance of a battery of a BMS product according to claim 1, wherein the internal resistance measurement is ended when any one of the following conditions is satisfied:
a: a charging current is present;
b: the minimum single string voltage Vmin is greater than or equal to 3350MV;
c: the minimum single string voltage Vmin is less than or equal to 3200MV and the discharge current I is less than or equal to 5A;
d: the discharge current I satisfies: -0.5c < i < -5A and lasting 3S.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311612305.3A CN117590262A (en) | 2023-11-29 | 2023-11-29 | BMS product battery internal resistance self-adaptive measurement method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311612305.3A CN117590262A (en) | 2023-11-29 | 2023-11-29 | BMS product battery internal resistance self-adaptive measurement method |
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2023
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