CN103529396B - A kind of initial value of stage of charge of high-accuracy evaluation method - Google Patents
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Abstract
The present invention proposes a kind of initial value of stage of charge of high-accuracy evaluation method, belongs to automobile power cell technical field.This evaluation method comprises the following steps: first according to open-circuit voltage under different temperatures and SOC corresponding relation curve, and table look-up estimation open-circuit voltage state-of-charge SOCocv；Secondly according to the time of repose of battery, battery current voltage platform, battery bag temperature, three-dimensional lookup table obtains the initial state-of-charge that powers on.The initial state-of-charge of self-discharge characteristics correction finally according to battery.On the basis of the factors such as the inventive method open circuit voltage characteristic at different temperatures, battery standing time, self-discharge of battery characteristic, effectively reduce the state-of-charge estimation error that when estimation of ampere-hour integration method initial value is forbidden the accumulated error caused and stops, static current consumption causes, there is higher accuracy.This method is applicable to the SOC initial value estimation of battery cell, module, battery assembly.
Description
Technical field
The invention belongs to the lithium battery management system field of new-energy automobile, relate to charge states of lithium ion battery
Evaluation method.
Background technology
Along with global climate progressively deteriorate, urban atmospheric pollution aggravation and petroleum resources consume excessively, automotive field
Sight has been thrown on new-energy automobile by increasing people.Lithium ion battery has that volume is little, energy density is high,
Storage life length, memory-less effect, high voltage and the premium properties such as self-discharge rate is low, be increasingly becoming new forms of energy vapour
The winner of car electrokinetic cell.Therefore, how to make good use of battery and become battery and one crucial skill of integration field thereof
Art, the most accurately monitors battery charge state (State of Charge, SOC), it has also become battery management system
Or even electric automobile research difficult point and hot issue.Therefore SOC estimation precision and the practicality of SOC algorithm are improved
There is the highest theory value and practical significance.
The most conventional SOC estimation method mainly has: ampere-hour integration method, open-circuit voltage method, neural network
Deng.Wherein ampere-hour integration method is method the most general, simplest, but maximum the lacking of ampere-hour integration method in the application
Point is: is chosen by initial SOC value and affects greatly, and initial value estimation is inaccurate, causes ampere-hour integration method SOC to estimate
There is accumulated error, greatly reduce the applicability of ampere-hour integration method.
Summary of the invention
In view of this, the present invention provides a kind of initial value of stage of charge of high-accuracy evaluation method, with
Realize high accuracy estimation initial SOC value, effectively reduce the accumulation that the estimation of ampere-hour integration method initial value is forbidden to cause
The SOC estimation error that when error and parking, static current consumption causes, substantially increases being suitable for of ampere-hour integration method
Property.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of high-precision lithium battery state-of-charge initial value evaluation method, comprises the following steps:
1, corresponding with state-of-charge SOC (State of Charge) according to open-circuit voltage under lithium battery different temperatures
Relation curve, table look-up estimation open-circuit voltage state-of-charge SOCocv, i.e. SOCocv=SOCocv (T, V)；
2, according to the time of repose of lithium battery, first power on record magnitude of voltage, the relation of battery temperature looks into three-dimensional
Coefficient table obtains the initial state-of-charge that powers on；
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 particularly as follows:
OCV under different temperatures T (Open Circuit Voltage, OCV) and the pass of SOC is obtained by test
System: SOCocv=SOCocv (T, V).
The described initial state-of-charge that powers on obtain particularly as follows: by battery bag stand front lower electricity storage state-of-charge with
Open-circuit voltage state-of-charge weights and obtains the initial state-of-charge that powers on:
SOCInitial value=w*SOCLower electricity storage value+(1-w)*SOCocv。
Described w is the initial state-of-charge estimation weight that powers on, and this weight w is by battery standing time t, go up first
Electrical measurement obtains magnitude of voltage V, battery bag temperature T three-dimensional lookup table obtains, and relational expression is w=w (t, V, T).
The initial state-of-charge of described correction is particularly as follows: SOCRevise initial value=η(w,V,T)*SOCInitial value, wherein η
(w, V, T) is and weight w, voltage V, the three-dimensional lookup table that temperature T-phase is closed.Electricity is estimated in advance by great many of experiments
The self discharge situation in pond, corrects initial state-of-charge by tabling look-up.
From above-mentioned technical scheme it can be seen that high-precision lithium battery state-of-charge initial value disclosed by the invention is estimated
Calculation method consider open circuit voltage characteristic under different temperatures, battery standing time, self-discharge of battery characteristic etc. because of
The element impact on state-of-charge estimation, effectively reduces the estimation of ampere-hour integration method initial value and is forbidden the accumulation caused to miss
The SOC estimation error that when difference and parking, 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 that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art.
Fig. 1 is the high-precision lithium battery state-of-charge initial value evaluation method flow chart that the present invention proposes.
Detailed description of the invention
Below in conjunction with Figure of description, technical scheme is described in further detail.
As it is shown in figure 1, a kind of initial value of stage of charge of high-accuracy evaluation method, specifically include with
Lower step:
S101, estimate according to open-circuit voltage under different temperatures and SOC (State of Charge, SOC) curve of tabling look-up
Calculate open-circuit voltage state-of-charge SOC under different temperaturesocv；
Concrete, by test obtain OCV under different temperatures T (Open Circuit Voltage, OCV) and
The relation of SOC: SOCocv=SOCocv(T,V)。
S102, according to the time of repose of battery, power on and record magnitude of voltage, battery bag temperature, three-dimensional lookup table first
Obtain the initial state-of-charge that powers on.
Specifically, front lower for battery bag standing electricity storage state-of-charge is weighted with open-circuit voltage state-of-charge on obtaining
Initial state-of-charge: the SOC of electricityInitial value=w*SOCLower electricity storage value+(1-w)*SOCocv.The need that weight w is concrete are carried out greatly
The test of amount, simulation analysis, set up battery standing time t, power on and record magnitude of voltage V, battery Bao Wen first
The three-dimensional lookup table relational expression of degree T: w=w (t, V, T).
S103, consider battery self-discharge characteristics to initial state-of-charge correction.
Concrete, it is considered to self-discharge of battery characteristic is to initial state-of-charge correction: SOCRevise initial value=η(w,V,T)*
SOCInitial value, wherein η (w, V, T) is and weight w, voltage V, the three-dimensional lookup table that temperature T-phase is closed.By greatly
The self discharge situation of battery is estimated in amount experiment in advance, corrects initial state-of-charge by tabling look-up.
In the above-described embodiments, a kind of initial value of stage of charge of high-accuracy that the present invention uses is estimated
Calculation method, with regard to battery charge state estimation influence factor considered open circuit voltage characteristic under different temperatures,
Battery standing time, self-discharge of battery characteristic, thus efficiently reduce ampere-hour integration accumulated error to SOC
The impact of initial value, makes SOC estimation initial value more accurate.
Claims (3)
1. an initial value of stage of charge of high-accuracy evaluation method, it is characterised 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 estimation different temperatures of tabling look-upocv；
(2) according to the time of repose of battery, powering on and record magnitude of voltage V, battery bag temperature T first, three-dimensional lookup table obtains the initial state-of-charge that powers on;The described initial state-of-charge that powers on specifically obtain for: battery bag is stood front lower electricity storage state-of-charge and open-circuit voltage state-of-charge weighting and obtains initial state-of-charge: the SOC that powers onInitial value=w*SOCLower electricity storage value+(1-w) *SOCocv；
W is the initial state-of-charge estimation weight that powers on；
(3) according to the initial state-of-charge of self-discharge characteristics correction of battery: consider that self-discharge of battery characteristic is to initial state-of-charge correction: SOCRevise initial value=η(w,V,T) * SOCInitial value, wherein η (w, V, T) is and weight w, voltage V, the three-dimensional lookup table that temperature T-phase is closed, and is estimated the self discharge situation of battery by great many of experiments in advance, corrects initial state-of-charge by tabling look-up.
Method the most according to claim 1, it is characterised in that the open-circuit voltage state-of-charge SOC of described step (1)ocvEstimation is particularly as follows: obtain the relation of OCV and SOC: SOC under different temperatures T by testocv= SOCocv
(T,V)。
Method the most according to claim 1 and 2, it is characterised in that described in power on initial state-of-charge estimation weight w by battery standing time t, first power on record magnitude of voltage V, battery bag three dimension temperature tables look-up acquisition, relational expression is w=w (t, V, T).
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