CN103529396A - Estimating method for initial value of stage of charge of high-accuracy lithium ion battery - Google Patents
Estimating method for initial value of stage of charge of high-accuracy lithium ion battery Download PDFInfo
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Abstract
The invention discloses an estimating method for the initial value of the stage of charge of a high-accuracy lithium ion battery and belongs to the technical field of automobile power batteries. The estimating method comprises the following steps: firstly, according to a corresponding relation curve of the open-circuit voltage and an SOC (Stage of Charge) at different temperatures, estimating an open-circuit voltage stage of charge (SOCocv) through the lookup table; secondly, according to standing time of the battery, the current voltage platform of the battery and the battery pack temperature, obtaining a power-on initial stage of charge through the three-dimensional lookup table; finally, according to the self-discharging characteristic of the battery, correcting the initial stage of charge. Through the adoption of the method disclosed by the invention, an accumulated error caused by inaccuracy of the initial value estimated through an ampere-hour integral method and the estimation error of stage of charge caused by static current loss in the shutdown process are effectively reduced on the basis of factors of the characteristics of the open-circuit voltage at different temperatures, the standing time of the battery, the self-discharging characteristics of the battery and the like, and the higher accuracy is achieved. The method is suitable for SOC initial value estimation of a single battery, a module and a battery assembly.
Description
Technical field
The invention belongs to the lithium battery management system field of new-energy automobile, relate to the evaluation method of charge states of lithium ion battery.
Background technology
Along with global climate progressively worsens, urban atmospheric pollution aggravates and petroleum resources consume excessively, automotive field increasing people thrown into sight on new-energy automobile.Lithium ion battery has that volume is little, energy density is high, storage life is long, memory-less effect, high voltage and the premium properties such as self-discharge rate is low, becomes gradually the winner of new-energy automobile power battery.Therefore, how making good use of battery has become battery and gordian technique of integration field thereof, and wherein accurate monitoring battery state-of-charge (State of Charge, SOC), has become difficult point and hot issue that battery management system and even electric automobile are studied.Therefore the practicality that improves SOC estimation precision and SOC algorithm has very high theory value and practical significance.
Conventional SOC evaluation method mainly contains at present: ampere-hour integral method, open-circuit voltage method, neural network etc.Wherein ampere-hour integral method is the most general, the simplest method, but the shortcoming of ampere-hour integral method maximum is in application: chosen by initial SOC value affects greatly, and initial value estimation is inaccurate, cause that ampere-hour integral method SOC estimation exists cumulative errors, greatly reduces the applicability of ampere-hour integral method.
Summary of the invention
In view of this, the invention provides a kind of high precision charge states of lithium ion battery initial value evaluation method, to realize high precision, estimate initial SOC value, the SOC estimation error that when effectively reducing ampere-hour integral method initial value estimation and being forbidden the cumulative errors causing and stop, static current consumption causes, has improved the applicability of ampere-hour integral method greatly.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A state-of-charge initial value evaluation method, comprises the following steps:
1,, according to open-circuit voltage under lithium battery different temperatures and state-of-charge SOC (State of Charge) corresponding relation curve, estimation open-circuit voltage state-of-charge SOCocv, i.e. SOCocv=SOCocv (T, V) table look-up;
2, according to the time of repose of lithium battery, the power on relation that records magnitude of voltage, battery temperature is looked into the three-dimensional coefficient table initial state-of-charge that obtains powering on first;
3, according to the initial state-of-charge of self-discharge characteristics correction of lithium battery.
Described open-circuit voltage state-of-charge SOCocv estimation is specially:
By test, obtain the relation of OCV under different temperatures T (Open Circuit Voltage, OCV) and SOC: SOCocv=SOCocv (T, V).
Being specially of the described initial state-of-charge that powers on: by the standing front lower electricity storage state-of-charge of power brick and the weighting of the open-circuit voltage state-of-charge initial state-of-charge that obtains powering on:
SOC
initial value=w*SOC
lower electric storing value+ (1-w) * SOCocv.
The described w initial state-of-charge estimation weight that is to power on, this weight w by battery standing time t, first power on record magnitude of voltage V, power brick temperature T three-dimensional lookup table obtains, relational expression is w=w (t, V, T).
The initial state-of-charge of described correction is specially: SOC
revise initial value=η (w, V, T) * SOC
initial value, wherein η (w, V, T) is and weight w, voltage V, the three-dimensional lookup table that temperature T is relevant.By the great many of experiments self discharge situation of estimating battery in advance, by tabling look-up, initial state-of-charge is proofreaied and correct.
From above-mentioned technical scheme, can find out, high-precision lithium battery state-of-charge initial value evaluation method disclosed by the invention considers the impact of the factors such as open-circuit voltage characteristic under different temperatures, battery standing time, self-discharge of battery characteristic on state-of-charge estimation, the SOC estimation error that when effectively reducing ampere-hour integral method initial value estimation and being forbidden the cumulative errors causing and stop, static current consumption causes, has higher accuracy.
This method is applicable to the SOC initial value estimation of battery cell, module, battery assembly.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below.
Fig. 1 is the high-precision lithium battery state-of-charge initial value evaluation method process flow diagram that the present invention proposes.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of high precision charge states of lithium ion battery initial value evaluation method, specifically comprises the following steps:
S101, according to open-circuit voltage state-of-charge SOC under open-circuit voltage under different temperatures and SOC (State of Charge, SOC) the curve estimation different temperatures of tabling look-up
ocv;
Concrete, by test, obtain the relation of OCV under different temperatures T (Open Circuit Voltage, OCV) and SOC: SOC
ocv=SOC
ocv(T, V).
S102, according to the time of repose of battery, power on and record magnitude of voltage, power brick temperature first, the three-dimensional lookup table initial state-of-charge that obtains powering on.
Concrete, by the standing front lower electricity storage state-of-charge of power brick and the weighting of open-circuit voltage state-of-charge initial state-of-charge: the SOC that obtains powering on
initial value=w*SOC
lower electric storing value+ (1-w) * SOC
ocv.The concrete need of weight w carry out a large amount of tests, simulation analysis, set up battery standing time t, power on and record the three-dimensional lookup table relational expression of magnitude of voltage V, power brick temperature T: w=w (t, V, T) first.
The self-discharge characteristics of S103, consideration battery is to initial state-of-charge correction.
Concrete, consider that self-discharge of battery characteristic is to initial state-of-charge correction: SOC
revise initial value=η (w, V, T) * SOC
initial value, wherein η (w, V, T) is and weight w, voltage V, the three-dimensional lookup table that temperature T is relevant.By the great many of experiments self discharge situation of estimating battery in advance, by tabling look-up, initial state-of-charge is proofreaied and correct.
In the above-described embodiments, a kind of high precision charge states of lithium ion battery initial value evaluation method that the present invention uses, influence factor with regard to battery charge state estimation has considered open-circuit voltage characteristic under different temperatures, battery standing time, self-discharge of battery characteristic, thereby effectively reduced the impact of ampere-hour integration cumulative errors on SOC initial value, made SOC estimation initial value more accurate.
Claims (5)
1. a high precision charge states of lithium ion battery initial value evaluation method, is characterized in that said method comprising the steps of:
(1) according to open-circuit voltage under different temperatures and SOC corresponding relation curve, open-circuit voltage state-of-charge SOC under the estimation different temperatures of tabling look-up
ocv;
(2) according to the time of repose of battery, power on and record magnitude of voltage V, power brick temperature T first, the three-dimensional lookup table initial state-of-charge that obtains powering on;
(3) according to the initial state-of-charge of self-discharge characteristics correction of battery.
2. method according to claim 1, is characterized in that, the open-circuit voltage state-of-charge SOC of described step (1)
ocvestimation is specially: the relation that obtains OCV and SOC under different temperatures T by test: SOC
ocv=SOC
ocv(T, V).
3. method according to claim 1 and 2, it is characterized in that, the initial state-of-charge that powers on of described step (2) specifically obtain for: by the standing front lower electricity storage state-of-charge of power brick and the weighting of open-circuit voltage state-of-charge initial state-of-charge: the SOC that obtains powering on
initial value=w*SOC
lower electric storing value+ (1-w) * SOC
ocv.W is the initial state-of-charge estimation weight that powers on.
4. method according to claim 3, is characterized in that, described in power on initial state-of-charge estimation weight w by battery standing time t, power on and record magnitude of voltage V, the power brick three dimension temperature acquisition of tabling look-up first, relational expression is w=w (t, V, T).
5. according to the method described in claim 4, it is characterized in that, the initial state-of-charge of correction of described step (3) is specially: consider that self-discharge of battery characteristic is to initial state-of-charge correction: SOC
revise initial value=η (w, V, T) * SOC
initial value, wherein η (w, V, T) is and weight w, voltage V, and the three-dimensional lookup table that temperature T is relevant, by the great many of experiments self discharge situation of estimating battery in advance, proofreaies and correct initial state-of-charge by tabling look-up.
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