CN106980092B - Method and device for calculating heat productivity of battery - Google Patents
Method and device for calculating heat productivity of battery Download PDFInfo
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- CN106980092B CN106980092B CN201710216897.5A CN201710216897A CN106980092B CN 106980092 B CN106980092 B CN 106980092B CN 201710216897 A CN201710216897 A CN 201710216897A CN 106980092 B CN106980092 B CN 106980092B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 59
- 230000007613 environmental effect Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000020169 heat generation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a device for calculating the calorific value of a battery, wherein the method comprises the following steps: respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable, and the resistance value of the physical internal resistance of the battery when the ambient temperature is used as a single variable; and calculating the heat productivity of the battery according to the three resistance values, the charge-discharge current and the charge-discharge time. According to the technical scheme, the accuracy of calculating the heat productivity of the battery is improved, and the reliability of a calculation result is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a device for calculating the heat productivity of a battery.
Background
The internal resistance of the battery is the root cause of the heating of the lithium battery, the internal resistance of the battery comprises physical internal resistance and polarization internal resistance, and the larger the internal resistance is, the larger the heating value is. There are three factors that determine the magnitude of the internal resistance: current intensity, charge-discharge depth and ambient temperature.
In the three factors, the change of the polarization internal resistance is not very stable, and the fluctuation of the physical internal resistance is large, so that the physical internal resistance of the battery is a dynamic value rather than a static value, and in the prior art, when the heat productivity of the battery is calculated, the physical internal resistance is generally treated as the static value, and the influence of the current intensity, the charge-discharge depth and the ambient temperature on the physical internal resistance is not fully considered, so that the calculated heat productivity of the battery is inaccurate, and the reliability of the calculation result is poor.
Disclosure of Invention
The invention mainly aims to provide a method for calculating the heat productivity of a battery, aiming at improving the accuracy of calculation of the heat productivity of the battery and improving the reliability of a calculation result.
In order to achieve the above object, the present invention provides a method for calculating a calorific value of a battery, including:
respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable, and the resistance value of the physical internal resistance of the battery, the charging and discharging current and the charging and discharging time when the ambient temperature is taken as a single variable;
and calculating the heat productivity of the battery according to the three resistance values, the charge-discharge current and the charge-discharge time.
Preferably, the obtaining the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable comprises:
by the formula
Calculating the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable; wherein R (c) represents the functional relation between the physical internal resistance of the battery and the charge-discharge multiplying power, and n is a positive integer.
Preferably, the obtaining of the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable comprises:
by the formula
Calculating the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable; wherein, R (x) represents the functional relation between the physical internal resistance of the battery and the charging and discharging depth, and n is a positive integer.
Preferably, the obtaining of the resistance value of the physical internal resistance of the battery when the ambient temperature is taken as the single variable comprises:
by the formula
Calculating the resistance value of the physical internal resistance of the battery when the environmental temperature is used as a single variable; wherein, R (t) represents the functional relation between the physical internal resistance of the battery and the ambient temperature, t1 represents the initial ambient temperature, and tn represents the ending ambient temperature.
Preferably, the calculating the heat value of the battery according to the three resistance values, the charge and discharge current and the charge and discharge time includes:
by the formula
To calculate the batteryA heating value; wherein, I is the charging and discharging current of the battery, T is the charging and discharging time, N is the serial number of the battery cells in the battery pack, M is the parallel number of the battery cells in the battery pack, and Rc, Rx and Rt respectively represent the resistance values of the physical internal resistance of the battery when the corresponding single variable is changed.
The invention also provides a device for calculating the calorific value of the battery, which comprises:
an acquisition module: respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable, and the resistance value of the physical internal resistance of the battery, the charging and discharging current and the charging and discharging time when the ambient temperature is taken as a single variable;
a calculation module: and calculating the heat productivity of the battery according to the three resistance values, the charge-discharge current and the charge-discharge time.
Preferably, the obtaining module passes a formula
Calculating the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable; wherein R (c) represents the functional relation between the physical internal resistance of the battery and the charge-discharge multiplying power, and n is a positive integer.
Preferably, the obtaining module passes a formula
Calculating the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable; wherein, R (x) represents the functional relation between the physical internal resistance of the battery and the charging and discharging depth, and n is a positive integer.
Preferably, the obtaining module passes a formula
Calculating the resistance value of the physical internal resistance of the battery when the environmental temperature is used as a single variable; wherein, R (t) represents the functional relation between the physical internal resistance of the battery and the ambient temperature, t1 represents the initial ambient temperature, and tn represents the ending ambient temperature.
Preferably, the calculation module passes a formula
Calculating the heat value of the battery; wherein, I is the charging and discharging current of the battery, T is the charging and discharging time, N is the serial number of the battery cells in the battery pack, M is the parallel number of the battery cells in the battery pack, and Rc, Rx and Rt respectively represent the resistance values of the physical internal resistance of the battery when the corresponding single variable is changed.
According to the technical scheme, the resistance value of the physical internal resistance of the battery when the current intensity of the battery is used as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable and the resistance value of the physical internal resistance of the battery when the ambient temperature is used as a single variable are respectively obtained, the influences of the current intensity, the charging and discharging depth and the ambient temperature on the physical internal resistance of the battery are fully considered, the physical internal resistance is used as a dynamic parameter to participate in calculating the heat productivity of the battery, and the accuracy of calculating the heat productivity of the.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for calculating a calorific value of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the variation trend of the physical internal resistance of the battery with different discharge rates;
FIG. 3 is a schematic diagram illustrating the variation trend of the physical internal resistance of the battery according to different charging and discharging depths;
FIG. 4 is a schematic diagram illustrating the variation trend of the physical internal resistance of the battery at different environmental temperatures according to the present invention;
fig. 5 is a functional block diagram of a device for calculating the calorific value of a battery according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a method for calculating the calorific value of a battery.
In the embodiment of the present invention, as shown in fig. 1, the method for calculating the calorific value of the battery includes:
s100, respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable, and the resistance value of the physical internal resistance of the battery, the charging and discharging current and the charging and discharging time when the ambient temperature is used as a single variable;
and S200, calculating the heat productivity of the battery according to the three resistance values, the charge and discharge current and the charge and discharge time.
In this embodiment, relevant data is measured through experiments, and then the data is calculated. For example, when the current intensity is used as a single variable (the charging and discharging depth and the ambient temperature are not changed), the physical internal resistance of the battery under different charging and discharging multiplying powers is counted, a graph of the discharging multiplying power and the physical internal resistance of the battery is obtained, and a corresponding functional relation is obtained.
It should be noted that, in general, the magnitude of the charge/discharge current is usually expressed by the charge/discharge rate, that is: the charge and discharge multiplying power is charge and discharge current/rated capacity; for example: when the battery 20A having a rated capacity of 100Ah (ampere hour) was discharged, the discharge rate was 0.2C. Cell discharge C rate, 1C, 2C, 0.2C are cell discharge rates: a measure of how fast the discharge is. The used capacity is discharged after 1 hour, and the discharge is called 1C discharge; when the discharge was completed for 5 hours, the discharge was called 1/5 ═ 0.2C discharge. The capacity of the battery can be generally detected by different discharge currents.
Similarly, when the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable and the resistance value of the physical internal resistance of the battery when the ambient temperature is taken as a single variable are calculated, relevant data are measured through experiments, and a corresponding curve graph and a corresponding functional relation are obtained.
And calculating the heat productivity of the battery according to a thermodynamic formula by combining the charging and discharging current and the charging and discharging time.
According to the technical scheme, the resistance value of the physical internal resistance of the battery when the current intensity of the battery is taken as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable and the resistance value of the physical internal resistance of the battery when the ambient temperature is taken as a single variable are respectively obtained, the influences of the current intensity, the charging and discharging depth and the ambient temperature on the physical internal resistance of the battery are fully considered, the physical internal resistance is taken as a dynamic parameter to participate in calculating the heat productivity of the battery, and the accuracy of calculating the heat productivity of.
Specifically, the obtaining of the resistance value of the physical internal resistance of the battery when the current intensity is taken as the single variable includes:
by the formula of calculus
Calculating the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable; wherein R (c) represents the functional relation between the physical internal resistance of the battery and the charge-discharge multiplying power, and n is a positive integer.
Referring to fig. 2, fig. 2 is a schematic diagram of the variation trend of the physical internal resistance of the battery with different discharge rates under three conditions of the discharge rates of 2C, 3C and 5C. The function R (c) is continuous in the interval [0, n ] (where n is a positive integer), and the discharge rate c is any point in the interval [0, n ]. When the charge-discharge multiplying factor is 5c, the function is the uppermost curve, when c is 0.5 in the interval [0, n ], Rc is 1.1, the function r (c) is a functional expression of the test result, the test result is plotted, and the function (1) is continuously changed in the interval [0, n ].
Specifically, the obtaining of the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable includes:
calculus by formula
Calculating the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable; wherein, R (x) represents the functional relation between the physical internal resistance of the battery and the charging and discharging depth, and n is a positive integer.
The depth of charge and discharge is defined as the depth of discharge when the battery is in use, the percentage of the discharged capacity of the battery to the rated capacity of the battery. The depth of discharge is deeply related to the charge life of a secondary battery (an electric storage battery or a rechargeable battery), and the deeper the depth of discharge of the secondary battery, the shorter the charge life of the secondary battery, which leads to a shorter service life of the battery.
Referring to fig. 3, fig. 3 records a schematic diagram of the variation trend of the physical internal resistance of the battery at different charging and discharging depths under the three conditions of 20%, 40% and 60% of the charging and discharging depth. The function R (x) is continuous in the interval [0, n ] (where n is a positive integer), and the charge-discharge depth x is any point in the interval [0, n ]. When the charge and discharge multiplying factor is 60% DOD, the function is the uppermost curve, the function r (x) is a functional expression of the test result, the test result is plotted, and the function (2) is continuously changed in the interval [0, n ].
Specifically, the obtaining of the resistance value of the physical internal resistance of the battery when the ambient temperature is taken as the single variable includes:
by the formula of calculus
Calculating the resistance value of the physical internal resistance of the battery when the environmental temperature is used as a single variable; wherein, R (t) represents the functional relation between the physical internal resistance of the battery and the ambient temperature, t1 represents the initial ambient temperature, and tn represents the ending ambient temperature.
Referring to fig. 4, fig. 3 is a schematic diagram of the variation trend of the physical internal resistance of the battery at different environmental temperatures under four conditions of the environmental temperature of 20 degrees celsius, 30 degrees celsius, 40 degrees celsius and 50 degrees celsius. The function r (t) is continuous over the interval [ t1, tn ] (where n is a positive integer) and the ambient temperature x is any point over the interval [ t1, tn ]. When the ambient temperature is 50 degrees celsius, the function is the uppermost curve, the function r (t) is a functional expression of the test results, and the test results are plotted, and the function is found to continuously vary over the interval [ t1, tn ].
Specifically, the calculating the heat value of the battery according to the three resistance values, the charge and discharge current and the charge and discharge time includes:
by the formula
Calculating the heat value of the battery; wherein, I is the charging and discharging current of the battery, T is the charging and discharging time, N is the serial number of the battery cells in the battery pack, M is the parallel number of the battery cells in the battery pack, and Rc, Rx and Rt respectively represent the resistance values of the physical internal resistance of the battery when the corresponding single variable is changed.
The formula (4) is derived from the thermodynamic formula Q — IUT, where I is the charge and discharge current, U is the charge and discharge voltage, and T is the charge and discharge time. In this implementation, including a plurality of electric cores in the battery, a plurality of electric cores divide into N electric core unit earlier, and the electric core quantity in every electric core unit is M, and N electric core unit establishes ties in proper order to provide the direct current source of high voltage for the load.
In the normal charging and discharging process, the current intensity, the charging and discharging depth and the ambient temperature are changed at any time, the influence of the three factors of the current intensity, the charging and discharging depth and the ambient temperature on the physical internal resistance of the battery is fully considered, the real-time size of the corresponding physical internal resistance of the battery is calculated through an integral function, the heat productivity of the battery is calculated through a thermodynamic formula, a relatively accurate calculation result is obtained, and the reliability of the calculation result is greatly improved.
Referring to fig. 5, the present invention also provides a device for calculating a battery calorific value, based on the method for calculating a battery calorific value, including:
the acquisition module 10: respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable, and the resistance value of the physical internal resistance of the battery when the ambient temperature is used as a single variable;
the calculation module 20: and calculating the heat productivity of the battery according to the three resistance values, the charge-discharge current and the charge-discharge time.
In particular, the acquisition module 10 uses the calculus formula
Calculating the resistance value; wherein R (c) represents the functional relation between the physical internal resistance of the battery and the charge-discharge multiplying power, and n is a positive integer.
In particular, the acquisition module 10 uses the calculus formula
Calculating the resistance value; wherein R (x) represents the functional relationship between the physical internal resistance and the charging and discharging depth of the batteryAnd n is a positive integer.
In particular, the acquisition module 10 uses the calculus formula
Calculating the resistance value; wherein, R (t) represents the functional relation between the physical internal resistance of the battery and the ambient temperature, t1 represents the initial ambient temperature, and tn represents the ending ambient temperature.
Specifically, the calculation module passes a formula
Calculating the heat value of the battery; wherein, I is the charging and discharging current of the battery, T is the charging and discharging time, N is the serial number of the battery cells in the battery pack, M is the parallel number of the battery cells in the battery pack, and Rc, Rx and Rt respectively represent the resistance values of the physical internal resistance of the battery when the corresponding single variable is changed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for calculating a calorific value of a battery, comprising:
respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable, and the resistance value of the physical internal resistance of the battery, the charging and discharging current and the charging and discharging time when the ambient temperature is taken as a single variable;
and calculating the heat productivity of the battery according to the sum of the three resistance values, the charge and discharge current and the charge and discharge time and a thermodynamic formula.
2. The method for calculating the calorific value of the battery according to claim 1, wherein the obtaining of the resistance value of the physical internal resistance of the battery with the current intensity as a single variable comprises:
by passingFormula (II)
Calculating the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable; wherein R (c) represents the functional relation between the physical internal resistance of the battery and the charge-discharge multiplying power, and n is a positive integer.
3. The method for calculating the calorific value of the battery according to claim 1, wherein obtaining the resistance value of the physical internal resistance of the battery with the charge-discharge depth as the single variable comprises:
by the formula
Calculating the resistance value of the physical internal resistance of the battery when the charging and discharging depth is used as a single variable; wherein, R (x) represents the functional relation between the physical internal resistance of the battery and the charging and discharging depth, and n is a positive integer.
4. The method for calculating the calorific value of the battery according to claim 1, wherein obtaining the resistance value of the physical internal resistance of the battery when the ambient temperature is taken as the single variable comprises:
by the formula
Calculating the resistance value of the physical internal resistance of the battery when the environmental temperature is used as a single variable; wherein, R (t) represents the functional relation between the physical internal resistance of the battery and the ambient temperature, t1 represents the initial ambient temperature, and tn represents the ending ambient temperature.
5. The method according to any one of claims 1 to 4, wherein the calculating of the battery heat generation amount based on the three resistance values, the charge-discharge current, and the charge-discharge time includes:
by the formula
Calculating the heat value of the battery; wherein, I is the battery chargeDischarging current, wherein T is charging and discharging time, N is the number of the cells in the battery in series connection, and M is the number of the cells in the battery in parallel connection, wherein Rc represents the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable; rx represents the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable; rt represents the resistance of the physical internal resistance of the battery with ambient temperature as a single variable.
6. A device for calculating a calorific value of a battery, comprising:
an acquisition module: respectively obtaining the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable, the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable, and the resistance value of the physical internal resistance of the battery, the charging and discharging current and the charging and discharging time when the ambient temperature is taken as a single variable;
a calculation module: and calculating the heat productivity of the battery according to the sum of the three resistance values, the charge and discharge current and the charge and discharge time and a thermodynamic formula.
7. The device for calculating the calorific value of the battery according to claim 6, wherein the obtaining module obtains the calorific value of the battery by a formula
Calculating the resistance value of the physical internal resistance of the battery when the current intensity is used as a single variable; wherein R (c) represents the functional relation between the physical internal resistance of the battery and the charge-discharge multiplying power, and n is a positive integer.
8. The device for calculating the calorific value of the battery according to claim 6, wherein the obtaining module obtains the calorific value of the battery by a formula
Calculating the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable; wherein, R (x) represents the functional relation between the physical internal resistance of the battery and the charging and discharging depth, and n is a positive integer.
9. The method of claim 6The battery heating value calculating device of (1), wherein the obtaining module is based on a formula
Calculating the resistance value of the physical internal resistance of the battery when the environmental temperature is taken as a single variable; wherein, R (t) represents the functional relation between the physical internal resistance of the battery and the ambient temperature, t1 represents the initial ambient temperature, and tn represents the ending ambient temperature.
10. The apparatus for calculating the calorific value of the battery according to any one of claims 6 to 9, wherein the calculation module calculates the calorific value of the battery by a formula
Calculating the heat value of the battery; wherein, I is the charging and discharging current of the battery, T is the charging and discharging time, N is the serial number of the battery cells in the battery, and M is the parallel number of the battery cells in the battery, wherein Rc represents the resistance value of the physical internal resistance of the battery when the current intensity is taken as a single variable; rx represents the resistance value of the physical internal resistance of the battery when the charging and discharging depth is taken as a single variable; rt represents the resistance of the physical internal resistance of the battery with ambient temperature as a single variable.
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| 氢镍蓄电池发热量测试方法研究;童铁峰 等;《电源技术》;20170228;第41卷(第2期);267-269 * |
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