CN115047347A - Method for judging residual electric quantity of underwater vehicle battery under dynamic load current - Google Patents
Method for judging residual electric quantity of underwater vehicle battery under dynamic load current Download PDFInfo
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- CN115047347A CN115047347A CN202210556586.4A CN202210556586A CN115047347A CN 115047347 A CN115047347 A CN 115047347A CN 202210556586 A CN202210556586 A CN 202210556586A CN 115047347 A CN115047347 A CN 115047347A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention relates to a method for judging the residual electric quantity of an underwater vehicle battery under dynamic load current, which comprises the steps of selecting a plurality of battery monomers with the same types as those of the monomers in a lithium battery pack to be tested, averagely dividing the battery monomers into a plurality of parts, and discharging until the battery monomers are cut off to voltage; averaging the 3 available electric quantities measured under respective multiplying powers to serve as the available electric quantities of corresponding multiplying powers; multiplying power compensation coefficients under different currents are calculated, discrete current-k functions are filled by adopting a function fitting method, a continuous current-k function corresponding rule is obtained, and finally consumed instantaneous capacity is: and calculating the residual capacity of the battery when the current I is dynamically changed. The invention fully considers the variable of the load current, so that the obtained battery residual capacity is more accurate.
Description
Technical Field
The invention belongs to a method for judging the residual electric quantity of a battery of an underwater vehicle, and relates to a method for judging the residual electric quantity of the battery of the underwater vehicle under dynamic load current.
Background
The electric underwater vehicle has great advantages in the aspects of structure, performance and the like due to the fact that the electric underwater vehicle is hot, the development speed is very high in recent years, and therefore the research on power batteries is very critical to the development and application of the electric underwater vehicle. Compared with other secondary batteries, the lithium ion battery has the advantages of high energy density, high working voltage, low self-discharge rate, convenience in use and maintenance, no memory effect and incomparable advantages of other secondary batteries, so that most of current underwater vehicles adopt the lithium ion battery as a power energy device.
At present, the lithium ion battery for the underwater vehicle is evaluated to generate heat and analyze a temperature field relative to a mature battery, and the current research for determining the influence of the temperature on the discharge performance of a battery monomer is relatively weak. In many applications, predicting the state of charge (SOC) of a battery is critical. Many engineers have established SOC prediction methods on the equation of Peukert that studies the available discharge capacity of lead acid batteries when discharged at constant current. However, the equation has a large limitation, and the Peukert equation cannot be used for accurately predicting the residual capacity unless the battery is discharged at constant current and constant temperature. In many practical cases, batteries may be discharged at different currents and experience a variety of temperatures. Many times the Peukert equation is used in systems for monitoring and supplying power; however, the associated disadvantage of more drastic changes in the discharge environment poses a challenge to this model. Because the average discharge current cannot accurately represent the record of the battery in the discharge process, and it is impossible to ensure that the temperature of the battery is kept constant in the discharge process, if the error introduced by establishing the average current model is possibly quite large, an equivalent electric quantity loss based on a real-time state needs to be introduced to estimate the state of charge of the battery.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a method for judging the residual electric quantity of a battery of an underwater vehicle under the condition of dynamic load current, and a method for predicting the residual electric quantity of a lithium battery pack for the underwater vehicle, which is different from the existing evaluation method, so as to overcome the defect that the existing evaluation method can only roughly calculate the residual electric quantity of the battery and cannot accurately evaluate the residual electric quantity.
Technical scheme
A method for determining the remaining capacity of an underwater vehicle battery under dynamic load current is characterized by the following steps:
step 1: selecting a plurality of battery monomers with the same type as the monomers in the lithium battery pack to be tested, averagely dividing the battery monomers into a plurality of parts, and discharging until the battery monomers are cut off to voltage; averaging the 3 available electric quantities measured under respective multiplying powers to serve as the available electric quantities of corresponding multiplying powers;
and 2, step: calculating multiplying power compensation coefficient under different currents
Wherein: q 0 Represents the dischargeable capacity, Q, of the cell at 1C rate current I Representing the dischargeable capacity of the battery under I current
And step 3: and (3) filling the discrete current-k functions by adopting a function fitting method to obtain a continuous current-k function corresponding rule, and finally consuming the instantaneous capacity:
ΔQr＝ΔQ·k(I)
effective amount of electricity that changes from time t1 to time t 2:
and 4, step 4: calculating the remaining capacity of the battery when the current I is dynamically changed:
the effective capacity consumed by the battery is integrated by taking the full-charge time of the battery as an integration starting point,
available electric quantity Q of battery under 1C multiplying power 0 As the nominal capacity, the remaining capacity of the battery under dynamic load, i.e. the capacity of the battery under dynamic load, is calculated
Q r ＝Q 0 -ΔQ。
The number of the battery monomers is 27, the battery monomers are averagely divided into 9 parts, and different loads are respectively carried out at 9 different multiplying powers: 1/20C, 1/10C, 1/5C, 1/2C, 1C, 2C, 5C, 10C, 20C.
Advantageous effects
The invention provides a method for judging the residual electric quantity of an underwater vehicle battery under dynamic load current, which comprises the steps of selecting a plurality of battery monomers with the same type as the monomers in a lithium battery pack to be tested, averagely dividing the battery monomers into a plurality of parts, and discharging until the battery monomers are cut off to voltage; averaging the 3 available electric quantities measured under respective multiplying powers to serve as the available electric quantities of corresponding multiplying powers; multiplying power compensation coefficients under different currents are calculated, discrete current-k functions are filled by adopting a function fitting method, a continuous current-k function corresponding rule is obtained, and finally consumed instantaneous capacity is: and calculating the residual capacity of the battery when the current I is dynamically changed.
The invention has the following technical effects:
1. most of the prior art methods are based on a simple ampere-hour integration method, and the invention provides a method for combining current load variables, by which the residual capacity of a battery under dynamic load current can be calculated.
2. Compared with the existing method for calculating the residual electric quantity by adopting simple ampere-hour integration, the method provided by the invention has the advantage that the obtained residual electric quantity of the battery is more accurate due to the fact that the variable of the load current is fully considered.
Drawings
FIG. 1: schematic diagram of test flow
FIG. 2 is a schematic diagram: function image example of battery available electricity quantity changing with current multiplying power
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the method for predicting the inconsistency of the lithium battery pack for the underwater vehicle, provided by the invention, comprises the following steps of:
step 1: in order to observe the influence of temperature and discharge rate on the capacity and energy of the battery, battery monomers with the same model number as the monomer in the lithium battery pack to be detected are selected, discharge experiments under different load currents are respectively conducted, the discharge experiments of the battery are planned to be conducted under 9 different rates (1/20C, 1/10C, 1/5C, 1/2C, 1C, 2C, 5C, 10C and 20C), and discharge data are recorded to obtain the discharge capacity of the battery under different load currents;
to improve the Peukert equation, an improved method is proposed herein to define the available capacity of a battery. The usable capacity of the battery is defined as the capacity of the battery discharged at a certain rate from a full charge state, the discharge is considered to be completed when the output voltage of the battery is lower than a cut-off voltage, and the amount of electricity discharged by the process is the usable amount of electricity of the battery. Since this assumption relates to the absolute maximum remaining capacity, the maximum remaining capacity of the battery reaches zero when the depth of discharge of the battery reaches 100%, and can never fall below this value of zero. To take into account the influence of the various discharge criteria, the conditions of the discharge program influence the discharge rate specifically as follows.
Wherein
Is the effective charge of the battery at time t,
representing the effective charge, Δ Q, of the battery at time t +1 r And (4) representing. As described above, the amount of power loss of the unit cell per time in this case is affected by the discharge current (I) and current rate (I) of the cell:
ΔQ r ＝k(I)·ΔQ (2)
from the discharge experiment data of the empirical battery, the discharge experiment is performed on the battery at 9 different multiplying powers (1/20C, 1/10C, 1/5C, 1/2C, 1C, 2C, 5C, 10C and 20C), the discharge data is recorded to obtain the discharge amount of the battery under different load currents, and therefore multiplying power compensation coefficients under different currents are calculated;
wherein Q 0 Represents the dischargeable capacity, Q, of the cell at a current of 1C rate I Representing the dischargeable capacity of the cell at I current. The function of the coefficient k is to tie up the reduced effective capacity with the measurable amount of power obtained by multiplying the actual current by time. The value of k is related to the discharge current and current multiplying factor. Finally, the discrete current-k functions are filled up by a function fitting method, and a continuous current-k function corresponding rule can be obtained, so that the finally consumed instantaneous capacity form is as follows:
ΔQr＝ΔQ·k(I) (4)
and the effective electric quantity is changed from the time t1 to the time t2
Therefore, the remaining capacity of the battery when the current I is dynamically changed can be calculated more accurately.
The effective capacity consumed by the battery is integrated by taking the full-charge time of the battery as an integration starting point,
available electric quantity Q of battery under 1C multiplying power 0 As the nominal capacity, the remaining capacity of the battery under dynamic load, i.e., the capacity of the battery under dynamic load can be calculated
Q r ＝Q 0 -ΔQ。
Claims (2)
1. A method for determining the remaining capacity of an underwater vehicle battery under dynamic load current is characterized by the following steps:
step 1: selecting a plurality of battery monomers with the same type as the monomers in the lithium battery pack to be tested, averagely dividing the battery monomers into a plurality of parts, and discharging until the battery monomers are cut off to voltage; averaging the 3 available electric quantities measured under respective multiplying powers to serve as the available electric quantities of corresponding multiplying powers;
and 2, step: calculating multiplying power compensation coefficient under different currents
Wherein: q 0 Represents the dischargeable capacity, Q, of the cell at a current of 1C rate I Representing the dischargeable capacity of the battery under I current
And step 3: and (3) filling the discrete current-k functions by adopting a function fitting method to obtain a continuous current-k function corresponding rule, and finally consuming the instantaneous capacity:
ΔQr＝ΔQ·k(I)
effective amount of electricity that changes from time t1 to time t 2:
and 4, step 4: calculating the remaining capacity of the battery when the current I is dynamically changed:
the effective capacity consumed by the battery is integrated by taking the full-charge moment of the battery as an integration starting point,
available electric quantity Q of battery under 1C multiplying power 0 As the nominal capacity, the remaining capacity of the battery under dynamic load, i.e. the capacity of the battery under dynamic load, is calculated
Q r ＝Q 0 -ΔQ。
2. The method of determining remaining power of an underwater vehicle battery at dynamic load currents as recited in claim 1, wherein: the number of the battery monomers is 27, the battery monomers are averagely divided into 9 parts, and different loads are respectively carried out at 9 different multiplying powers: 1/20C, 1/10C, 1/5C, 1/2C, 1C, 2C, 5C, 10C, 20C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310509A (en) * | 2023-11-30 | 2023-12-29 | 西北工业大学 | Method for acquiring state parameters in full service period of underwater equipment battery pack |
| CN117890813A (en) * | 2024-03-12 | 2024-04-16 | 江苏慕林智造科技股份有限公司 | Battery electric quantity detection method and detection system based on dynamic load condition |
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- 2022-05-17 CN CN202210556586.4A patent/CN115047347A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117310509A (en) * | 2023-11-30 | 2023-12-29 | 西北工业大学 | Method for acquiring state parameters in full service period of underwater equipment battery pack |
| CN117310509B (en) * | 2023-11-30 | 2024-02-09 | 西北工业大学 | Method for acquiring state parameters in full service period of underwater equipment battery pack |
| CN117890813A (en) * | 2024-03-12 | 2024-04-16 | 江苏慕林智造科技股份有限公司 | Battery electric quantity detection method and detection system based on dynamic load condition |
| CN117890813B (en) * | 2024-03-12 | 2024-06-11 | 江苏慕林智造科技股份有限公司 | Battery electric quantity detection method and detection system based on dynamic load condition |
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