CN109188292A - A kind of projectional technique and system of the DC internal resistance of lithium ion battery - Google Patents
A kind of projectional technique and system of the DC internal resistance of lithium ion battery Download PDFInfo
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- CN109188292A CN109188292A CN201811093571.9A CN201811093571A CN109188292A CN 109188292 A CN109188292 A CN 109188292A CN 201811093571 A CN201811093571 A CN 201811093571A CN 109188292 A CN109188292 A CN 109188292A
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- internal resistance
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- ion battery
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Abstract
The invention discloses a kind of projectional technique of the DC internal resistance of lithium ion battery and systems, to solve the problems, such as it is existing internal resistance of cell temperature is only capable of to test at limited several, the method are as follows: lithium ion battery is carried out to DC internal resistance under multiple experimental temperatures and tests to obtain corresponding DC internal resistance；Model is established according to the experimental temperature and corresponding DC internal resistance in conjunction with Arrhenius equation；The DC internal resistance of arbitrary temp point of the same money battery in the temperature range of the experimental temperature is extrapolated according to the model.The present invention can test the DC internal resistance value of arbitrary temp point, practicability is stronger by establishing the model of temperature and DC internal resistance.
Description
Technical field
The present invention relates to the projectional technique of battery technology field more particularly to a kind of DC internal resistance of lithium ion battery and it is
System.
Background technique
Extensive use with the energy-storage system based on lithium ion battery in fields such as electric vehicles is guaranteeing service life and safety
Precondition under, user to routine use experience also increasingly pay close attention to；The power and DC internal resistance of power battery are lithium ions
One of most important parameter in battery.It is typically all both at home and abroad at present to surround the test of internal resistance under room temperature to the analysis of the internal resistance of cell
It is unfolded to study with discrimination method, and refers to less, and existing electricity to the lithium battery inner resistance under different work condition environment states
Pond internal resistance temperature testing method is only capable of testing limited several points, and practicability is poor.
Summary of the invention
The technical problem to be solved in the present invention is designed to provide a kind of projectional technique of the DC internal resistance of lithium ion battery
And system, to solve the problems, such as that existing internal resistance of cell analysis practicability is poor, test limitation is big.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of projectional technique of the DC internal resistance of lithium ion battery, comprising steps of
Lithium ion battery is carried out to DC internal resistance to test to obtain corresponding DC internal resistance under multiple experimental temperatures；
Model is established according to the experimental temperature and corresponding DC internal resistance in conjunction with Arrhenius equation；
The straight of arbitrary temp point of the same money battery in the temperature range of the experimental temperature is extrapolated according to the model
Flow internal resistance.
It is described that same money battery is extrapolated in the temperature range of the experimental temperature according to the model in above scheme
It the step of DC internal resistance of arbitrary temp point, specifically includes:
The formula that relationship is varied with temperature according to chemical reaction rate constant is converted to linear equation using mathematical formulae,
Obtain the DC internal resistance of arbitrary temp point.
In above scheme, the chemical reaction rate constant varies with temperature the formula of relationship are as follows:
In above scheme, the mathematical formulae is converted to linear equation specifically:
A kind of Estimation System of the DC internal resistance of lithium ion battery, comprising:
Test module, for lithium ion battery is carried out under multiple experimental temperatures DC internal resistance test to obtain it is corresponding straight
Flow internal resistance；
Modeling module, for establishing mould according to the experimental temperature and corresponding DC internal resistance in conjunction with Arrhenius equation
Type；
Module is calculated, for extrapolating same money battery appointing in the temperature range of the experimental temperature according to the model
The DC internal resistance of meaning temperature spot.
In above scheme, the reckoning module is specifically included:
Formula cells are turned for varying with temperature the formula of relationship according to chemical reaction rate constant using mathematical formulae
It is changed to linear equation, obtains the DC internal resistance of arbitrary temp point.
In above scheme, in the formula cells, chemical reaction rate constant varies with temperature the formula of relationship are as follows:
In above scheme, in the formula cells, mathematical formulae is converted to linear equation specifically:
The present invention is compared with the traditional technology, and is had the following advantages:
The present invention derives that same money battery is straight under practical service environment by establishing the model of temperature and DC internal resistance
Internal resistance value is flowed, practicability is stronger.
Detailed description of the invention
Fig. 1 is the projectional technique flow chart of the DC internal resistance of lithium ion battery in one embodiment of the invention；
Fig. 2 is the Estimation System structure chart of the DC internal resistance of lithium ion battery in another embodiment of the present invention.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Unless otherwise defined, all technical and scientific terms used herein and technical field technology people of the invention
The normally understood meaning of member is identical.Used term is intended merely to describe specifically to implement in the description of the present invention herein
The purpose of example, it is not intended that in the limitation present invention.
The present invention is by establishing the model of temperature and DC internal resistance, to derive same money battery under practical service environment
DC resistance.
Referring to Fig. 1, for the projectional technique flow chart of the DC internal resistance of lithium ion battery in one embodiment of the invention.
The projectional technique of the DC internal resistance of the lithium ion battery, comprising steps of
S101, it lithium ion battery is carried out to DC internal resistance under multiple experimental temperatures tests to obtain corresponding DC internal resistance.
Lithium ion battery is a kind of secondary cell (rechargeable battery), it relies primarily on lithium ion and moves between a positive electrode and a negative electrode
It moves and carrys out work.In charge and discharge process, Li+ insertion and deintercalation back and forth between two electrodes；When charging, Li+ from positive deintercalation,
It is embedded in cathode by electrolyte, cathode is in lithium-rich state；It is then opposite when electric discharge.DC internal resistance refers to battery under operating condition
Voltage change and corresponding discharge current the ratio between change.
First by lithium ion battery under multiple experimental temperatures Ti(such as: -20 DEG C, -15 DEG C, -10 DEG C, 5 DEG C, 0 DEG C, 5
DEG C, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C, 40 DEG C) DC internal resistance test is carried out, obtain corresponding DC internal resistance value
Ri。
S103, model is established according to the experimental temperature and corresponding DC internal resistance in conjunction with Arrhenius equation.
Influence of the temperature to chemical reaction velocity is particularly significant, and almost all of chemical reaction velocity is all with the liter of temperature
It is high and increase.The relationship of temperature and reaction speed is actually the relationship of temperature and rate constant.Arrhenius
(Arrhenius) empirical equation for the relationship between velocity constant K and temperature T that indicates is proposed according to experimental result:Or K=A × e-Ea/RT.
In conjunction with Arrhenius equation by experimental temperature TiWith the DC internal resistance R measurediEstablish model.
S105, arbitrary temp point of the same money battery in the temperature range of the experimental temperature is extrapolated according to the model
DC internal resistance.
Wherein, described that any temperature of the same money battery in the temperature range of the experimental temperature is extrapolated according to the model
The step of spending the DC internal resistance of point, specifically includes:
The formula that relationship is varied with temperature according to chemical reaction rate constant is converted to linear equation using mathematical formulae,
Obtain the DC internal resistance of arbitrary temp point.
Wherein, the chemical reaction rate constant varies with temperature the formula of relationship are as follows:
The mathematical formulae is converted to linear equation specifically:
By above-mentioned model, the DC internal resistance value under any environment temperature can be learnt.
The relationship of temperature and DC internal resistance is usually based on linear or polynomial relation in industry, but degree of fitting is lower, fits
It is poor with property, the innovation of the invention consists in that the relationship of temperature and DC internal resistance is set up in conjunction with the principles of chemistry, it is with strong applicability.
Referring to Fig. 2, for the Estimation System structure chart of the DC internal resistance of lithium ion battery in one embodiment of the invention.
The Estimation System of the DC internal resistance of the lithium ion battery, comprising:
Test module 201 is tested for lithium ion battery to be carried out to DC internal resistance under multiple experimental temperatures and is corresponded to
DC internal resistance.
Lithium ion battery is a kind of secondary cell (rechargeable battery), it relies primarily on lithium ion and moves between a positive electrode and a negative electrode
It moves and carrys out work.In charge and discharge process, Li+ insertion and deintercalation back and forth between two electrodes；When charging, Li+ from positive deintercalation,
It is embedded in cathode by electrolyte, cathode is in lithium-rich state；It is then opposite when electric discharge.DC internal resistance refers to battery under operating condition
Voltage change and corresponding discharge current the ratio between change.
First by lithium ion battery under multiple experimental temperatures Ti(such as: -20 DEG C, -15 DEG C, -10 DEG C, 5 DEG C, 0 DEG C, 5
DEG C, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C, 40 DEG C) DC internal resistance test is carried out, obtain corresponding DC internal resistance value
Ri。
Modeling module 203, for being built in conjunction with Arrhenius equation according to the experimental temperature and corresponding DC internal resistance
Formwork erection type.
Influence of the temperature to chemical reaction velocity is particularly significant, and almost all of chemical reaction velocity is all with the liter of temperature
It is high and increase.The relationship of temperature and reaction speed is actually the relationship of temperature and rate constant.Arrhenius
(Arrhenius) empirical equation for the relationship between rate constant K and temperature T that indicates is proposed according to experimental result:Or K=A × e-Ea/RT.
In conjunction with Arrhenius equation by experimental temperature TiWith the DC internal resistance R measurediEstablish model.
Module 205 is calculated, for extrapolating same money battery in the temperature range of the experimental temperature according to the model
Arbitrary temp point DC internal resistance.
Wherein, the reckoning module 205, specifically includes:
Formula cells are turned for varying with temperature the formula of relationship according to chemical reaction rate constant using mathematical formulae
It is changed to linear equation, obtains the DC internal resistance of arbitrary temp point.
Wherein, in the formula cells, the chemical reaction rate constant varies with temperature the formula of relationship are as follows:
The mathematical formulae is converted to linear equation specifically:
By above-mentioned model, the DC internal resistance value under any environment temperature can be learnt.
The relationship of temperature and DC internal resistance is usually based on linear or polynomial relation in industry, but degree of fitting is lower, fits
It is poor with property, the innovation of the invention consists in that the relationship of temperature and DC internal resistance is set up in conjunction with the principles of chemistry, it is with strong applicability.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (8)
1. a kind of projectional technique of the DC internal resistance of lithium ion battery, which is characterized in that comprising steps of
Lithium ion battery is carried out to DC internal resistance to test to obtain corresponding DC internal resistance under multiple experimental temperatures；
Model is established according to the experimental temperature and corresponding DC internal resistance in conjunction with Arrhenius equation；
Same money battery is extrapolated in the direct current of the arbitrary temp point in the temperature range of the experimental temperature according to the model
Resistance.
2. the projectional technique of the DC internal resistance of lithium ion battery according to claim 1, which is characterized in that described according to institute
The step of model extrapolates the DC internal resistance of arbitrary temp point of the same money battery in the temperature range of the experimental temperature is stated, is had
Body includes:
The formula that relationship is varied with temperature according to chemical reaction rate constant is converted to linear equation using mathematical formulae, obtains
The DC internal resistance of arbitrary temp point.
3. the projectional technique of the DC internal resistance of lithium ion battery according to claim 2, which is characterized in that the chemistry is anti-
Rate constant is answered to vary with temperature the formula of relationship are as follows:
4. the projectional technique of the DC internal resistance of lithium ion battery according to claim 2, which is characterized in that the mathematics is public
Formula is converted to linear equation specifically:
5. a kind of Estimation System of the DC internal resistance of lithium ion battery characterized by comprising
Test module tests to obtain in corresponding direct current for lithium ion battery to be carried out to DC internal resistance under multiple experimental temperatures
Resistance；
Modeling module, for establishing model according to the experimental temperature and corresponding DC internal resistance in conjunction with Arrhenius equation；
Module is calculated, for extrapolating any temperature of the same money battery in the temperature range of the experimental temperature according to the model
Spend the DC internal resistance of point.
6. the Estimation System of the DC internal resistance of lithium ion battery according to claim 5, which is characterized in that the reckoning mould
Block specifically includes:
Formula cells are converted to for varying with temperature the formula of relationship according to chemical reaction rate constant using mathematical formulae
Linear equation obtains the DC internal resistance of arbitrary temp point.
7. the Estimation System of the DC internal resistance of lithium ion battery according to claim 6, which is characterized in that the formula list
In member, chemical reaction rate constant varies with temperature the formula of relationship are as follows:
8. the Estimation System of the DC internal resistance of lithium ion battery according to claim 6, which is characterized in that the formula list
In member, mathematical formulae is converted to linear equation specifically:
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2018
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| JP2007057385A (en) * | 2005-08-24 | 2007-03-08 | Fuji Heavy Ind Ltd | Degradation estimation system for electricity accumulation device |
| CN105203846A (en) * | 2015-09-11 | 2015-12-30 | 国家电网公司 | Method for eliminating influences of low temperature on testing of internal resistance of energy storage battery |
| CN106154171A (en) * | 2016-06-17 | 2016-11-23 | 清华大学 | Set up the method for damping function in battery DC |
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Application publication date: 20190111 |