CN109143092A

CN109143092A - Method and device for generating cell model and acquiring cell voltage and battery management system

Info

Publication number: CN109143092A
Application number: CN201710464261.2A
Authority: CN
Inventors: 张炳雁; 蒋治亿
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2017-06-19
Filing date: 2017-06-19
Publication date: 2019-01-04
Anticipated expiration: 2037-06-19
Also published as: CN109143092B

Abstract

The embodiment of the invention provides a method and a device for generating a cell model and acquiring cell voltage and a battery management system. In the embodiment of the present invention, by obtaining an equivalent working circuit of a battery cell, the equivalent working circuit includes: concentration polarization circuit, then, according to equivalent working circuit, obtain the initial model of electric core operating voltage, include the constant coefficient of unknown numerical value in the initial model to, through the working data of gathering electric core, the working data includes: the method comprises the steps of working state, working time, working current and working voltage, therefore, based on an initial model, performing approximate fitting processing on working data to obtain the numerical value of each constant coefficient in the initial model, and further obtaining an acquisition model of the working voltage of the battery cell according to the numerical value of each constant coefficient and the initial model. Therefore, the technical scheme provided by the embodiment of the invention can improve the accuracy of obtaining the model of the working voltage of the battery cell to a certain extent and reduce the potential safety hazard.

Description

Battery core model generates and battery core voltage acquisition methods, device and battery management system

[technical field]

The present invention relates to battery technology fields more particularly to a kind of battery core model to generate and battery core voltage acquisition methods, dress It sets and battery management system.

[background technique]

In battery management system (Battery Management System, BMS), the meter of battery core real-time working voltage It calculates and prediction model is one of the core column in BMS, also referred to as core algorithm.In recent years, with the application of lithium-ion electric core Range is gradually promoted, also more harsh using operating condition, this to BMS obtain battery core voltage core algorithm requirement also increasingly Height, this plays the safe early warning problem of battery core and the performance of battery core most important.

Currently, the core algorithm for obtaining battery core model is generally based on Order RC circuit in BMS What the electrochemical model of (Resistance-Capacitance Circuits) was realized.Specifically, being electricity by the Order RC circuit The physics equivalent operation circuit of core regards the concentration polarization phenomenon bring partial pressure of battery core as simple a resistance or capacitor etc. Simple physical device is calculated, to obtain the acquisition model of battery core operating voltage.

In realizing process of the present invention, at least there are the following problems in the prior art for inventor's discovery:

The acquisition model of existing battery core operating voltage is obtained according to Order RC circuit, since battery core is equivalent to two Rank RC circuit, the partial pressure only generated concentration polarization in Order RC circuit are regarded the partial pressure that General Physics device generates as, are caused The accuracy of the acquisition model of existing battery core operating voltage is lower, and accordingly, there exist some potential safety problemss.

[summary of the invention]

In view of this, the embodiment of the invention provides a kind of battery core model generate with battery core voltage acquisition methods, device and Battery management system, to improve the accuracy of the acquisition model of battery core operating voltage to a certain extent and reduce safe hidden Suffer from.

In a first aspect, the embodiment of the invention provides a kind of battery core model generating methods, comprising:

The equivalent operation circuit of battery core is obtained, the equivalent operation circuit includes: concentration polarization circuit；

According to the equivalent operation circuit, the initial model of the battery core operating voltage is obtained, is wrapped in the initial model Constant coefficient containing unknown numerical value；

The operational data of the battery core is acquired, the operational data includes: working time, operating current and operating voltage；

Based on the initial model, the operational data is carried out to approach process of fitting treatment, be obtained each in the initial model The numerical value of constant coefficient；

According to the numerical value of each constant coefficient and the initial model, the acquisition model of the battery core operating voltage is obtained.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the equivalent work Make circuit further include: open-circuit voltage source, first resistor, capacitor and second resistance；

The concentration polarization circuit includes: concentration polarization element；

The open-circuit voltage source, the first resistor, the second resistance are connected with the concentration polarization element；

The capacitor is in parallel with the second resistance.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to described etc. Operating circuit is imitated, the initial model of the battery core operating voltage is obtained, comprising:

According to the equivalent operation circuit, the partial pressure of the first resistor, the partial pressure of the second resistance, institute are obtained respectively The partial pressure and the open-circuit voltage, the open-circuit voltage for stating concentration polarization element are the voltage in the open-circuit voltage source, described the It include the constant of unknown numerical value in the partial pressure of one resistance, the partial pressure of the second resistance and the partial pressure of the concentration polarization element Coefficient；

According to the open-circuit voltage, the partial pressure of the first resistor, the partial pressure of the second resistance and the concentration polarization The partial pressure for changing element, generates the initial model of the battery core operating voltage.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, when the battery core Working condition be charged state when, the initial model of the battery core operating voltage are as follows:

U_t=U_oc+U₁+U₂-U₃

When the working condition of the battery core is discharge condition, the initial model of the battery core operating voltage are as follows:

U_t=U_oc-U₁-U₂+U₃

Wherein, U_tIndicate the battery core operating voltage, U_ocIndicate the open-circuit voltage of the battery core, U₁Indicate first electricity The partial pressure of resistance, U₂Indicate the partial pressure of the second resistance, U₃Indicate the partial pressure of the concentration polarization element.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to described etc. Operating circuit is imitated, the partial pressure of the concentration polarization element is obtained, comprising:

By following formula, the partial pressure of the concentration polarization element is obtained:

Wherein, U₃Indicate the partial pressure of the concentration polarization element, ∝ indicates polarization coefficient, wherein ∝=d1 × SOC^d2, τ Indicate transit time, whereinB is the first coefficient, B=g1 × I^g2×e^g3×T, E_aFor the second system Number indicates diffusion activation energy, E_a=f1 × SOC^f2, SOC indicates that the remaining capacity of the battery core, t indicate the work of the battery core Time, I indicate that the operating current of the battery core, T indicate operating temperature, and R is ideal gas constant, and F is Faraday constant, and n is The amount of substance, d1, d2, g1, g2, g3, f1 and f2 are constant coefficient.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to described etc. Operating circuit is imitated, the partial pressure of the second resistance is obtained, comprising:

By following formula, the partial pressure of the second resistance is obtained:

Wherein, U₂Indicate the partial pressure of the second resistance, I indicates that the operating current of the battery core, t indicate the battery core Working time, R₂For the resistance value of the second resistance, wherein R₂=b1 × SOC^b2×e^b3×T, C is the capacitance of the capacitor, C =h1 × SOC^h2×e^h3×T, b1, b2, b3, h1, h2 and h3 are constant coefficient, and T indicates operating temperature, and SOC indicates the battery core Remaining capacity.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to described etc. Operating circuit is imitated, the partial pressure of the first resistor is obtained, comprising:

By following formula, the partial pressure of the first resistor is obtained:

U₁=I × R₁

Wherein, U₁Indicate the partial pressure of the first resistor, I indicates the operating current of the battery core, R₁For the first resistor Resistance value, wherein R₁=a1 × SOC^a2×e^a3×T, a1, a2 and a3 are constant coefficient, and T indicates operating temperature, and SOC indicates institute State the remaining capacity of battery core.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, when the battery core Working condition be charged state when, by following formula, obtain the remaining capacity of the battery core:

When the working condition of the battery core is charged state, by following formula, the remaining capacity of the battery core is obtained:

Wherein, SOC₀Indicate the initial quantity of electricity of the battery core, C₀For the battery core rated capacity, I indicates the work of the battery core Make electric current, t indicates the working time of the battery core.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, based on described first Beginning model carries out the operational data to approach process of fitting treatment, obtains the numerical value of each constant coefficient in the initial model, packet It includes:

It based on the initial model, carries out curve fitting to the operational data, obtains several fitting voltage curves；

According to the working time and the operating voltage, the real voltage curve of the battery core is obtained；

In several fitting voltage curves, obtain and the highest fitting electricity of the approximation ratio of the real voltage curve Line of buckling is aim curve；

The numerical value for obtaining each constant coefficient in the aim curve, using the number as each constant coefficient in the initial model Value.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, according to each constant The numerical value of coefficient and the initial model, obtain the acquisition model of the battery core operating voltage, comprising:

The numerical value for each constant coefficient that will acquire substitutes into the initial model, obtains the acquisition mould of the battery core operating voltage Type.

A technical solution in above-mentioned technical proposal has the following beneficial effects:

In the embodiment of the present invention, by obtaining the equivalent operation circuit of battery core, battery core operating voltage is equivalent to single order RC The partial pressure of circuit and the partial pressure of concentration polarization circuit, are based on this, according to the acquisition model that the equivalent operation circuit obtains, Ke Yitong Relationship between overcurrent density and concentration polarization determines partial pressure of the concentration polarization in battery core operating voltage, obtains subject to more The partial pressure of true concentration polarization, thus, the accuracy for obtaining model acquisition battery core operating voltage according to this is also improved, and is reduced Due to the larger bring security hidden trouble of the error of operating voltage.Therefore, technical solution provided by the embodiment of the present invention The accuracy of the acquisition model of battery core operating voltage can be improved to a certain extent and reduces security risk.

Second aspect, the embodiment of the invention provides a kind of battery core voltage acquisition methods, comprising:

The operational data of battery core is acquired, the operational data includes: operating current and working time；

The battery core operating voltage is obtained using the acquisition model of battery core operating voltage based on the operational data；It is described The acquisition model of battery core operating voltage is the mould that the battery core model generating method obtained using any of the above-described kind of implementation is obtained Type.

In the embodiment of the present invention, it is only necessary to battery core working time during the work time and operating current are acquired, Battery core operating voltage can be got according to the acquisition model of battery core operating voltage, implementation is simple, and it is higher to obtain efficiency.

The third aspect, the embodiment of the invention provides a kind of battery core model generating means, comprising:

First acquisition unit, for obtaining the equivalent operation circuit of battery core, the equivalent operation circuit includes: concentration polarization Circuit；

Second acquisition unit, for obtaining the initial model of the battery core operating voltage according to the equivalent operation circuit, It include the constant coefficient of unknown numerical value in the initial model；

Acquisition unit, for acquiring the operational data of the battery core, the operational data includes: working time, work electricity Stream and operating voltage；

Processing unit carries out the operational data to approach process of fitting treatment, obtain described for being based on the initial model The numerical value of each constant coefficient in initial model；

Third acquiring unit obtains the battery core work for the numerical value and the initial model according to each constant coefficient The acquisition model of voltage.

The capacitor is in parallel with the second resistance.

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, described second obtains Unit is taken, is used for:

U_t=U_oc+U₁+U₂-U₃

U_t=U_oc-U₁-U₂+U₃

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, described second obtains Unit is taken, is specifically used for:

By following formula, the partial pressure of the first resistor is obtained:

U₁=I × R₁

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, described second obtains Unit is taken, also particularly useful for:

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the processing are single Member is specifically used for:

The aspect and any possible implementation manners as described above, it is further provided a kind of implementation, the third obtain Unit is taken, is specifically used for:

Fourth aspect, the embodiment of the invention provides a kind of battery core voltage acquisition apparatus, comprising:

Acquisition unit, for acquiring the operational data of battery core, the operational data includes: operating current and working time；

Acquiring unit, for obtaining the battery core using the acquisition model of battery core operating voltage based on the operational data Operating voltage；The acquisition model of the battery core operating voltage is that the battery core model obtained using any of the above-described kind of implementation is generated The model that method obtains.

5th aspect, the embodiment of the invention provides a kind of battery management systems, comprising:

Battery core model generating means under any implementation as described above；And

Above-mentioned battery core voltage acquisition apparatus.

In the embodiment of the present invention, by obtaining the equivalent operation circuit of battery core, battery core operating voltage is equivalent to single order RC The partial pressure of circuit and the partial pressure of concentration polarization circuit, are based on this, according to the acquisition model that the equivalent operation circuit obtains, Ke Yitong Relationship between overcurrent density and concentration polarization determines partial pressure of the concentration polarization in battery core operating voltage, obtains subject to more The partial pressure of true concentration polarization, thus, the accuracy for obtaining model acquisition battery core operating voltage according to this is also improved, and is reduced Due to the larger bring security hidden trouble of the error of operating voltage.Also, in the embodiment of the present invention, it is only necessary to exist to battery core Working time and operating current in the course of work are acquired, and can get electricity according to the acquisition model of battery core operating voltage Core operating voltage, implementation is simple, and it is higher to obtain efficiency.Therefore, technical solution provided by the embodiment of the present invention can be The accuracy of the acquisition model of battery core operating voltage is improved to a certain extent and reduces security risk.

[Detailed description of the invention]

In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field For those of ordinary skill, without creative efforts, it can also be obtained according to these attached drawings other attached drawings.

Fig. 1 is the flow diagram of battery core model generating method provided by the embodiment of the present invention；

Fig. 2 is the structural schematic diagram of the equivalent operation circuit of battery core in the embodiment of the present invention；

Fig. 3 is the relation curve schematic diagram in the embodiment of the present invention between remaining capacity and open-circuit voltage；

Fig. 4 be in the embodiment of the present invention 20Ah hard shell battery core when 20A operating current (1C multiplying power) is in charged state The schematic diagram of aim curve and real voltage curve；

Fig. 5 be in the embodiment of the present invention 20Ah hard shell battery core when 100A operating current (5C multiplying power) is in charged state The schematic diagram of aim curve and real voltage curve；

Fig. 6 be in the embodiment of the present invention 20Ah hard shell battery core when 20A operating current (1C multiplying power) is in discharge condition The schematic diagram of aim curve and real voltage curve；

Fig. 7 be in the embodiment of the present invention 20Ah hard shell battery core when 100A operating current (5C multiplying power) is in discharge condition The schematic diagram of aim curve and real voltage curve；

Fig. 8 is the operational data schematic diagram of collected 12Ah PHEV battery core in the embodiment of the present invention；

Fig. 9 is the relation curve schematic diagram of the remaining capacity and open-circuit voltage of 12Ah PHEV battery core in the embodiment of the present invention；

Figure 10 is the schematic diagram of the aim curve Yu real voltage curve of 12Ah PHEV battery core in the embodiment of the present invention；

Figure 11 is the flow diagram of battery core voltage acquisition methods provided by the embodiment of the present invention；

Figure 12 is the functional block diagram of battery core model generating means provided by the embodiment of the present invention；

Figure 13 is the functional block diagram of battery core voltage acquisition apparatus provided by the embodiment of the present invention；

Figure 14 is the functional block diagram of battery management system provided by the embodiment of the present invention.

[specific embodiment]

For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention with reference to the accompanying drawing It states.

It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its Its embodiment, shall fall within the protection scope of the present invention.

The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments The present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the" It is also intended to including most forms, unless the context clearly indicates other meaning.

It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".

It will be appreciated that though resistance may be described using term first, second, third, etc. in embodiments of the present invention, But these resistance should not necessarily be limited by these terms.These terms are only used to for resistance being distinguished from each other out.For example, not departing from the present invention In the case where scope of embodiments, first resistor can also be referred to as second resistance, and similarly, second resistance can also be referred to as One resistance.

Depending on context, word as used in this " if " can be construed to " ... when " or " when ... When " or " in response to determination " or " in response to detection ".Similarly, depend on context, phrase " if it is determined that " or " if detection (condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when the detection (condition of statement Or event) when " or " in response to detection (condition or event of statement) ".

Accuracy the acquisition model of existing battery core operating voltage is lower and there are problems that security risk, this hair Bright embodiment provides following resolving ideas: by battery core be equivalent to one include concentration polarization circuit equivalent operation circuit, Battery core operating voltage is obtained by obtaining the partial pressure of each section component in the equivalent operation circuit, also, by concentration polarization Change accurately calculating for the shared partial pressure of circuit, the accuracy of the acquisition model of battery core operating voltage can be improved, and reduces due to essence Exactness reduces bring security risk.

Under the guidance of the thinking, this programme embodiment provides following feasible embodiment.

Embodiment one

The embodiment of the present invention provides a kind of battery core model generating method.During a concrete implementation, this method can To be applied in BMS.

Specifically, referring to FIG. 1, it illustrates for the process of battery core model generating method provided by the embodiment of the present invention Figure, as shown in Figure 1, method includes the following steps:

S101 obtains the equivalent operation circuit of battery core.

It should be noted that the equivalent operation circuit includes: concentration polarization circuit in the embodiment of the present invention.

Referring to FIG. 2, its structural schematic diagram for the equivalent operation circuit of battery core in the embodiment of the present invention, as shown in Fig. 2, The equivalent operation circuit can include but is not limited to: concentration polarization circuit 22.Specifically, as shown in Fig. 2, the equivalent operation circuit Further include: open-circuit voltage source 201, first resistor 202, capacitor 203 and second resistance 204；Concentration polarization circuit 22 includes: concentration difference Polarization element 205.As shown in Fig. 2, the connection relationship in the equivalent operation circuit between each device are as follows: open-circuit voltage source 201, One resistance 202, second resistance 204 are connected with concentration polarization element 205, also, capacitor 203 is in parallel with second resistance 204.

It is understood that being based on this, the partial pressure of capacitor 203 as shown in Fig. 2, capacitor 203 is in parallel with second resistance 204 It is equal with the partial pressure of second resistance 204, in this way, point of capacitor 203 can be got by obtaining the partial pressure of second resistance 204 Pressure.

During concrete implementation, as shown in Fig. 2, U_tIndicate battery core operating voltage, the voltage in open-circuit voltage source 201 is The open-circuit voltage U of battery core_oc, first resistor 202 can indicate the ohmic polarization internal resistance of battery core, and second resistance 204 can be expressed as Activation polarization internal resistance, capacitor 203 can be electrochemical reaction electric double layer capacitance.

S102 obtains the initial model of battery core operating voltage, includes not in the initial model according to equivalent operation circuit Know the constant coefficient of numerical value.

S103 acquires the operational data of battery core.

In the embodiment of the present invention, the operational data of battery core be can include but is not limited to: working time, operating current and work Voltage.

It should be noted that during actually realizing this programme, when executing the step, one can also be acquired simultaneously Operational data relevant to battery core self attributes a bit.For example, the operating temperature of the open-circuit voltage of battery core, battery core, battery core is initial The operational datas such as electricity and battery core rated capacity.For the battery core determining for one, this part operational data is fixed.

S104 is based on initial model, carries out approaching process of fitting treatment to operational data, obtain each constant coefficient in initial model Numerical value.

S105 obtains the acquisition model of battery core operating voltage according to the numerical value and initial model of each constant coefficient.

Hereinafter, the implementation of Fig. 1 the method is specifically described in conjunction with Fig. 1 and Fig. 2.

In the embodiment of the present invention, when executing S102, point of first resistor can be obtained according to equivalent operation circuit respectively Pressure, the partial pressure of second resistance, the partial pressure of concentration polarization element and open-circuit voltage, open-circuit voltage are the voltage in open-circuit voltage source, the It include the constant coefficient of unknown numerical value in the partial pressure of the partial pressure of one resistance, the partial pressure of second resistance and concentration polarization element, into And according to the partial pressure of open-circuit voltage, the partial pressure of first resistor, the partial pressure of second resistance and concentration polarization element, generate battery core The initial model of operating voltage.

It should be noted that the partial pressure of concentration polarization is to battery core operating voltage based on battery core under different working conditions Influence it is different, therefore, when executing the step, different battery core operating voltages can be generated based on different working conditions Initial model.

Working condition involved in the embodiment of the present invention may include: charged state or discharge condition.Therefore, work as battery core Working condition be charged state when, the initial model of the battery core operating voltage of generation can indicate are as follows:

U_t=U_oc+U₁+U₂-U₃

When the working condition of battery core is discharge condition, the initial model of the battery core operating voltage of generation can be indicated are as follows:

U_t=U_oc-U₁-U₂+U₃

Wherein, U_tIndicate battery core operating voltage, U_ocIndicate the open-circuit voltage of battery core, U₁Indicate the partial pressure of first resistor, U₂Table Show the partial pressure of second resistance, U₃Indicate the partial pressure of concentration polarization element.

During concrete implementation, point of the first resistor in above-mentioned initial model can be obtained by following formula Pressure:

U₁=I × R₁

Wherein, U₁Indicate the partial pressure of first resistor, I indicates the operating current of battery core, R₁For the resistance value of first resistor.

In the embodiment of the present invention, the partial pressure of first resistor is partial pressure, the resistance value R of first resistor caused by ohmic polarization₁Only It is related with the remaining capacity SOC of battery core and work temperature.Specifically, the resistance value R of first resistor₁It can indicate are as follows:

R₁=a1 × SOC^a2×e^a3×T

Wherein, a1, a2 and a3 are constant coefficient, and T indicates operating temperature, and SOC indicates the remaining capacity of battery core.

During concrete implementation, point of the second resistance in above-mentioned initial model can be obtained by following formula Pressure:

Wherein, U₂Indicate the partial pressure of second resistance, I indicates that the operating current of battery core, t indicate the working time of battery core, R₂For The resistance value of second resistance, C are the capacitance of capacitor.

In the embodiment of the present invention, the resistance value R of second resistance₂With the capacitance C of capacitor all only with the remaining capacity SOC of battery core And work temperature is related.Wherein, the resistance value R of second resistance₂It can indicate are as follows:

R₂=b1 × SOC^b2×e^b3×T

The capacitance C of capacitor can be indicated are as follows:

C=h1 × SOC^h2×e^h3×T

Wherein, b1, b2, b3, h1, h2 and h3 are constant coefficient, and T indicates operating temperature, and SOC indicates the residue electricity of battery core Amount.

During a concrete implementation, the concentration polarization in above-mentioned initial model can be obtained by following formula The partial pressure of element:

Wherein, U₃Indicate the partial pressure of concentration polarization element, ∝ indicates that polarization coefficient, τ indicate transit time, and t indicates battery core Working time, T indicates operating temperature, and R is ideal gas constant, and F is Faraday constant, and n is the amount of substance；Polarization coefficient ∝ It is only related with the remaining capacity SOC of battery core, it can indicate are as follows: ∝=d1 × SOC^d2；

In the embodiment of the present invention, transit time τ can be indicated are as follows:

Wherein, B is that the first coefficient, B and work temperature are related with operating current I, can be indicated are as follows: B=g1 × I^g2× e^g3×T；E_aFor the second coefficient, diffusion activation energy, E are indicated_aIt is only related with the remaining capacity SOC of battery core, it can indicate are as follows: E_a=f1 ×SOC^f2；SOC indicates that the remaining capacity of battery core, I indicate the operating current of battery core, and d1, d2, g1, g2, g3, f1 and f2 are normal Number system number.

In the embodiment of the present invention, the open-circuit voltage U that is related in above-mentioned formula_ocAcquisition modes can be with are as follows: pass through residue Electricity SOC and open-circuit voltage U_ocBetween relationship be determined.

Specifically, in view of work temperature is smaller on the influence of the balanced voltage of lithium-ion electric core, it therefore, can be in room temperature Under (25 DEG C), to remaining capacity SOC and open-circuit voltage U_ocIt is detected, and obtains remaining capacity SOC and open-circuit voltage U_ocBetween Corresponding relationship.At this point it is possible to be that the relationship in the embodiment of the present invention between remaining capacity and open-circuit voltage is bent with reference to Fig. 3 Line schematic diagram.In Fig. 3, remaining capacity is indicated in the form of percentage, and the unit of open-circuit voltage is V.It is bent based on the relationship in Fig. 3 Line can determine corresponding open-circuit voltage U according to remaining capacity SOC of the battery core under actual working state_oc。

Based on this, be related in above-mentioned each formula the remaining capacity SOC of battery core acquisition modes can there are many.For example, The remaining capacity of battery core can be obtained according to the remaining capacity of the battery core of measurement and the working curve of working time, alternatively, It can be by obtaining the remaining capacity of battery core to the integral of working time to operating current.

During a concrete implementation, the remaining capacity of battery core can be obtained by current integration method.At this point, It is different according to the working condition of battery core, also may include the following two kinds situation:

The first, by following formula, obtains the remaining capacity of battery core when the working condition of battery core is charged state:

Second, when the working condition of battery core is charged state, by following formula, obtain the remaining capacity of battery core:

Wherein, SOC₀Indicate the initial quantity of electricity of battery core, C₀For battery core rated capacity, I indicates that the operating current of battery core, t indicate The working time of battery core.

Based on the above content, the expression formula of each section partial pressure is substituted into the acquisition model of battery core operating voltage, so that it may The initial model of telecommunications operations voltage is obtained, includes the constant coefficient in each section partial pressure expression formula in these initial models.

It should be noted that the coefficient of at least two types involved in the embodiment of the present invention.Wherein, constant coefficient refers to constant As coefficient, as soon as the acquisition model of the operating voltage for battery core under rigid condition, constant coefficient is once determining No longer change, for example, b1, d2, g1, b2, h1 etc. in above-mentioned expression formula；Another kind of coefficient is changed with a certain variable Coefficient, for example, polarization coefficient ∝, the first coefficient B and the second coefficient E in appeal expression formula_aDeng.

Based on the above content, each section expression formula in the initial model of battery core operating voltage is substituted into the table of the initial model Up to after formula, the initial model of available following two battery core operating voltage:

When the working condition of battery core is charged state, the initial model of battery core operating voltage are as follows:

When the working condition of battery core is discharge condition, the initial model of battery core operating voltage are as follows:

Based on the above initial model, the embodiment of the present invention execute in above-mentioned S103 acquire battery core operational data the step of. Collected operating voltage is the real work voltage of battery core in this step, and operating current is the real work electric current of battery core, Operating voltage and operating current can be acquired by detection device.Working time can be according to the working condition of battery core point For charging time and discharge time.

Specifically, can determine the current working condition of battery core, and then determine and use according to operating current and operating voltage Which above-mentioned initial model carries out subsequent step, and this will not be repeated here.

When the embodiment of the present invention executes S104 step, curve can be carried out to operational data based on obtained initial model Fitting, obtains several fitting voltage curves, also, according to working time and operating voltage, obtain the real voltage curve of battery core, Then, in several fitting voltage curves, the highest fitting voltage curve of approximation ratio with real voltage curve is obtained For aim curve, thus, the numerical value of each constant coefficient in aim curve is obtained, using the number as constant coefficient each in initial model Value.

It should be noted that the aim curve got by the approach scheme and real voltage curve approach journey Spend highest, that is to say, that aim curve is a fitting of wireless approaching to reality voltage curve in several fitting voltage curves Voltage curve, similarity highest between the two, difference are minimum.Approximation ratio can be measured according to the size of similarity.On The step of stating the real voltage curve for obtaining several fitting voltage curves and battery core can carry out simultaneously, alternatively, with preset suitable Sequence successively executes, and the embodiment of the present invention is to this without being particularly limited to.

Based on the numerical value of each constant coefficient got in S104, when executing S105, each constant coefficient for will will acquire Numerical value substitute into initial model, the acquisition model of battery core operating voltage can be obtained.

The technical solution of the embodiment of the present invention has the advantages that

Embodiment two

Battery core model generating method provided by one, the embodiment of the present invention provide the generation method based on the above embodiment Two kinds of feasible realization processes.

The first, generates the acquisition model of 20Ah hard shell battery core operating voltage.

Specifically, the 20Ah hard shell battery core can be in pure electric automobile (Blade Electric Vehicles, BEV) Battery core rated capacity is the battery core of 20Ah.

Firstly, the equivalent operation circuit of the 20Ah hard shell battery core is obtained, circuit structure and equivalent operation shown in Fig. 2 electricity The structure on road is identical.

Then, according to the equivalent operation circuit, the initial model of the 20Ah hard shell battery core operating voltage is obtained.Specifically, When the working condition of battery core is charged state, the initial model of battery core operating voltage are as follows:

In the embodiment of the present invention, in the initial model every physical significance referred to and its expression formula all with embodiment one In it is identical, this will not be repeated here.Based on this, 20Ah hard shell battery core operating voltage U_tInitial model in each section expression formula It include the constant coefficient of unknown numerical value.

Later, the operational datas such as operating voltage, operating current and the working time of the 20Ah hard shell battery core are acquired.

Wherein, the 20Ah hard shell battery core remaining capacity SOC and open-circuit voltage U are detected under the conditions of 25 DEG C_oc, obtain remaining electricity Measure SOC and open-circuit voltage U_ocBetween corresponding relationship, the corresponding relationship curve can refer to Fig. 3, and be based on correspondence shown in Fig. 3 Relation curve is carried out getting remaining capacity SOC by current integration method, no longer be repeated herein.

Wherein, it is also based on collected operating voltage and working time, obtains the pass that operating voltage changes with the working time It is curve, that is, obtains the real voltage curve of the 20Ah hard shell battery core.

Then, collected operating current, working time and operating voltage are substituted into above-mentioned initial model, it is available A plurality of fitting voltage curve, at this point, being screened based on real voltage curve to these fitting voltage curves, acquisition is wirelessly approached One fitting voltage curve of real voltage curve as aim curve, then, obtain each constant coefficient in this objective curve Numerical value, the numerical value as each constant coefficient in the initial model.

Specifically, obtaining the 20Ah hard shell battery core under the conditions of 25 DEG C and being filled respectively at 20A operating current (1C multiplying power) Operational data and the 20Ah hard shell battery core under electricity condition and discharge condition exist respectively at 100A operating current (5C multiplying power) This four groups of data, are updated in above-mentioned initial model respectively, are forced by the operational data under charged state and discharge condition Nearly fitting, fitting result can be each constant system in the initial model of the 20Ah hard shell battery core operating voltage with reference table 1, table 1 Several number lists.

Table 1

Constant coefficient	a1	a2	a3	h1
					Numerical value	1.04×10¹⁰	-1.46×10^-01	-1.04×10^-01	3.01×10^-6
Constant coefficient	b1	b2	b3	h2
					Numerical value	6.20×10^-03	-8.00×10^-02	-4.17×10^-03	2.55×10^-04
Constant coefficient	g1	g2	g3	h3
					Numerical value	4.14×10⁺¹¹	1.41×10^-05	-1.96×10^-02	1.11×10^-02
Constant coefficient	d1	d2	f1	f2
					Numerical value	1.77×10^-01	-7.80×10^-02	1.83×10⁺⁰⁴	1.24

Specifically, the aim curve obtained with initial model based on each constant coefficient in table 1 and real voltage curve are shown Intention can refer to Fig. 4~Fig. 7.Wherein, Fig. 4 is 20Ah hard shell battery core in the embodiment of the present invention at (1C times of 20A operating current Rate) be in charged state when aim curve and real voltage curve schematic diagram, Fig. 5 be the embodiment of the present invention in 20Ah hard shell The schematic diagram of the battery core aim curve when 100A operating current (5C multiplying power) is in charged state and real voltage curve, Fig. 6 For aim curve of the 20Ah hard shell battery core in the embodiment of the present invention when 20A operating current (1C multiplying power) is in discharge condition and very The schematic diagram of real voltage curve, Fig. 7 are that 20Ah hard shell battery core is in 100A operating current (5C multiplying power) in the embodiment of the present invention The schematic diagram of aim curve and real voltage curve when discharge condition.

As shown in Figure 4 to 7, aim curve is curve 1, and real voltage curve is curve 2.Also, such as Fig. 4~Fig. 7 institute Show, curve 1 is infinitely approached with curve 2, even in coincidence status.That is, the aim curve can be in different work The real voltage curve of the 20Ah hard shell battery core is accurately characterized under electric current and working condition.

Based on this, the specific value of constant coefficient each in table 1 is substituted into above-mentioned initial model, the 20Ah hard shell can be obtained The acquisition model of battery core operating voltage.Therefore, in actual application, it is only necessary to obtain the work electricity of the 20Ah hard shell battery core Pressure and operating current, so that it may can be obtained by the 20Ah hard shell by the way that operating voltage and operating current are substituted into the acquisition model The operating voltage of battery core.

Second, generate the acquisition model of 12Ah PHEV battery core operating voltage.

Specifically, the 12Ah PHEV battery core be new-energy automobile (plug in hybrid electric vehicle, PHEV battery core rated capacity is the battery core of 12Ah in).

Firstly, the equivalent operation circuit of the 12Ah PHEV battery core is obtained, circuit structure and equivalent operation shown in Fig. 2 The structure of circuit is identical.

Then, according to the equivalent operation circuit, the initial model of the 12Ah PHEV battery core operating voltage is obtained.Specifically, When the working condition of battery core is charged state, the initial model of battery core operating voltage are as follows:

In the embodiment of the present invention, in above-mentioned initial model every physical significance referred to and its expression formula all with embodiment Identical in one, this will not be repeated here.Based on this, above-mentioned battery core operating voltage U_tInitial model in include in each section expression formula There is the constant coefficient of unknown numerical value.

Later, the operational datas such as operating voltage, operating current and the working time of the 12Ah PHEV battery core are acquired.

Specifically, using the operating condition voltage curve of the 12Ah PHEV battery core as its real work number in the embodiment of the present invention According to.At this point, the remaining capacity SOC of the 12Ah PHEV battery core can be obtained by Fig. 8.Fig. 8 is to adopt in the embodiment of the present invention The operational data schematic diagram of the 12Ah PHEV battery core collected, wherein curve 1 is the residue electricity of the 12Ah PHEV battery core in Fig. 8 Amount and working time curve, curve 2 are the operating current and working time curve of the 12Ah PHEV battery core.The 12Ah PHEV electricity The remaining capacity of core and the relation curve of open-circuit voltage are as shown in figure 9, at this point it is possible to get the 12Ah according to the curved line relation The open-circuit voltage of PHEV battery core.

In the embodiment of the present invention, it is also necessary to be based on collected operating voltage and working time, obtain operating voltage with work Make the relation curve of time change, that is, obtains the real voltage curve of the 12Ah PHEV battery core.

In the embodiment of the present invention, under the conditions of 25 DEG C, the above-mentioned operational data generation for the 12Ah PHEV battery core that will acquire Enter into above-mentioned initial model, carries out approaching fitting, fitting result can be the 12Ah PHEV battery core with reference table 2, table 2 The number list of each constant coefficient in the initial model of operating voltage.

Table 2

Constant coefficient	a1	a2	a3	h1
					Numerical value	5.75×10⁺⁰¹	-1.15	-4.10×10^-02	9.92×10^-1
Constant coefficient	b1	b2	b3	h2
					Numerical value	3.53×10⁺⁰⁴	-7.68×10^-3	-1.21×10^-1	4.45×10^-2
Constant coefficient	g1	g2	g3	h3
					Numerical value	1.06×10⁺⁷	2.73×10^-01	-6.02×10^-4	1.67×10^-02
Constant coefficient	d1	d2	f1	f2
					Numerical value	1.53×10^-04	-9.25×10^-02	2.36×10⁺⁰⁴	6.87×10^-01

Specifically, the aim curve obtained with initial model based on each constant coefficient in table 2 and real voltage curve are shown Intention can refer to Figure 10.Wherein, Figure 10 is that the aim curve of 12Ah PHEV battery core and real voltage are bent in the embodiment of the present invention The schematic diagram of line, as shown in Figure 10, curve 1 are the aim curve of the 12Ah PHEV battery core, and curve 2 is the 12Ah PHEV battery core Real voltage curve.Also, as shown in Figure 10, curve 1 is infinitely approached with curve 2, error very little between the two, the target Curve can accurately characterize the real voltage curve of the 12Ah PHEV battery core.

Based on this, the specific value of constant coefficient each in table 2 is substituted into above-mentioned initial model, the 12Ah can be obtained The acquisition model of PHEV battery core operating voltage.Therefore, in actual application, it is only necessary to obtain the operating voltage and work of battery core Make electric current, so that it may can be obtained by the work of the hardware battery core by the way that operating voltage and operating current are substituted into the acquisition model Voltage.

Embodiment three

The embodiment of the present invention provides a kind of battery core voltage acquisition methods.Figure 11 is please referred to, is mentioned by the embodiment of the present invention The flow diagram of the battery core voltage acquisition methods of confession, as shown in figure 11, comprising:

S1101 acquires the operational data of battery core.

Specifically, operational data includes: operating current and working time.

S1102 obtains the operating voltage of battery core using the acquisition model of battery core operating voltage based on operational data.

It should be noted that in the embodiment of the present invention, when executing S1102, by the operational data generation of collected battery core The acquisition model for entering battery core operating voltage, can be obtained battery core operating voltage.

During a concrete implementation, the acquisition model of battery core operating voltage can be provided by above-described embodiment one Acquisition model.

Example IV

Battery core model generating method provided by one, the embodiment of the present invention further provide in realization based on the above embodiment State the Installation practice of each step and method in embodiment of the method.

Figure 12 is please referred to, is the functional block diagram of battery core model generating means provided by the embodiment of the present invention.Such as figure Shown in 12, which includes:

First acquisition unit 121, for obtaining the equivalent operation circuit of battery core, equivalent operation circuit includes: concentration polarization Circuit；

Second acquisition unit 122, for obtaining the initial model of battery core operating voltage, initially according to equivalent operation circuit It include the constant coefficient of unknown numerical value in model；

Acquisition unit 123, for acquiring the operational data of battery core, operational data includes: working time, operating current and work Make voltage；

Processing unit 124 carries out operational data to approach process of fitting treatment, obtains initial model for being based on initial model In each constant coefficient numerical value；

Third acquiring unit 125 obtains battery core operating voltage for the numerical value and initial model according to each constant coefficient Obtain model.

Specifically, in the embodiment of the present invention, equivalent operation circuit further include: open-circuit voltage source, first resistor, capacitor and Two resistance；

Concentration polarization circuit includes: concentration polarization element；

Open-circuit voltage source, first resistor, second resistance are connected with concentration polarization element；

Capacitor is in parallel with second resistance.

Based on the above equivalent operation circuit, second acquisition unit 122 is used for:

According to equivalent operation circuit, the partial pressure of first resistor, the partial pressure of second resistance, concentration polarization element are obtained respectively Partial pressure and open-circuit voltage, open-circuit voltage are the voltage in open-circuit voltage source, the partial pressure of first resistor, the partial pressure of second resistance and concentration difference It include the constant coefficient of unknown numerical value in the partial pressure of polarization element；

According to the partial pressure of open-circuit voltage, the partial pressure of first resistor, the partial pressure of second resistance and concentration polarization element, generate The initial model of battery core operating voltage.

Specifically, in the embodiment of the present invention, when the working condition of battery core is charged state, battery core operating voltage it is initial Model are as follows:

U_t=U_oc+U₁+U₂-U₃

U_t=U_oc-U₁-U₂+U₃

During concrete implementation, second acquisition unit 122 is specifically used for:

By following formula, the partial pressure of concentration polarization element is obtained:

Wherein, U₃Indicate the partial pressure of concentration polarization element, ∝ indicates polarization coefficient, wherein ∝=d1 × SOC^d2, τ expression Transit time, whereinB is the first coefficient, B=g1 × I^g2×e^g3×T, E_aFor the second coefficient, Indicate diffusion activation energy, E_a=f1 × SOC^f2, the remaining capacity of SOC expression battery core, the working time of t expression battery core, I indicates electricity The operating current of core, T indicate operating temperature, and R is ideal gas constant, and F is Faraday constant, and n is the amount of substance, d1, d2, G1, g2, g3, f1 and f2 are constant coefficient.

By following formula, the partial pressure of second resistance is obtained:

Wherein, U₂Indicate the partial pressure of second resistance, I indicates that the operating current of battery core, t indicate the working time of battery core, R₂For The resistance value of second resistance, wherein R₂=b1 × SOC^b2×e^b3×T, C is the capacitance of capacitor, C=h1 × SOC^h2×e^h3×T, b1, B2, b3, h1, h2 and h3 are constant coefficient, and T indicates operating temperature, and SOC indicates the remaining capacity of battery core.

By following formula, the partial pressure of first resistor is obtained:

U₁=I × R₁

Wherein, U₁Indicate the partial pressure of first resistor, I indicates the operating current of battery core, R₁For the resistance value of first resistor, wherein R₁=a1 × SOC^a2×e^a3×T, a1, a2 and a3 are constant coefficient, and T indicates operating temperature, and SOC indicates the remaining capacity of battery core.

During a concrete implementation, second acquisition unit 122, also particularly useful for:

When the working condition of battery core is charged state, by following formula, the remaining capacity of battery core is obtained:

Specifically, processing unit 124 is specifically used in the embodiment of the present invention:

It based on initial model, carries out curve fitting to operational data, obtains several fitting voltage curves；

According to working time and operating voltage, the real voltage curve of battery core is obtained；

In several fitting voltage curves, obtain bent with the highest fitting voltage of the approximation ratio of real voltage curve Line is aim curve；

The numerical value for obtaining each constant coefficient in aim curve, using the numerical value as constant coefficient each in initial model.

In the embodiment of the present invention, third acquiring unit 125 is specifically used for:

The numerical value for each constant coefficient that will acquire substitutes into initial model, obtains the acquisition model of battery core operating voltage.

Method shown in FIG. 1 is able to carry out by each unit in this present embodiment, the part that the present embodiment is not described in detail, It can refer to the related description to Fig. 1.

Embodiment five

Battery core voltage acquisition methods, the embodiment of the present invention provided by three further provide in realization based on the above embodiment State the Installation practice of each step and method in embodiment of the method.

Figure 13 is please referred to, is the functional block diagram of battery core voltage acquisition apparatus provided by the embodiment of the present invention.Such as figure Shown in 13, which includes:

Acquisition unit 131, for acquiring the operational data of battery core, operational data includes: operating current and working time；

Acquiring unit 132, using the acquisition model of battery core operating voltage, obtains battery core work for being based on operational data Voltage.Wherein, the acquisition model of battery core operating voltage be it is any described in the embodiment one in the way of obtained battery core model The model that generation method obtains.

Method shown in Figure 11, the portion that the present embodiment is not described in detail are able to carry out as each unit in this present embodiment Point, it can refer to the related description to Figure 11.

Embodiment six

Battery core voltage provided by battery core model generating method and above-described embodiment three provided by above-described embodiment one Acquisition methods, the embodiment of the present invention provide a kind of battery management system.

Figure 14 is please referred to, is the functional block diagram of battery management system provided by the embodiment of the present invention.Such as Figure 14 institute Show, which includes:

Battery core model generating means 141 under any implementation as described above；And

Above-mentioned battery core voltage acquisition apparatus 142.

The part that the present embodiment is not described in detail can refer to the related description to Fig. 1 and Figure 11.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In several embodiments provided by the present invention, it should be understood that disclosed system, device and method can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or group Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown Or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, device or unit it is indirect Coupling or communication connection can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.

The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer It is each that device (can be personal computer, server or network equipment etc.) or processor (Processor) execute the present invention The part steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read- Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. it is various It can store the medium of program code.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.

Claims

1. a kind of battery core model generating method, which is characterized in that the described method includes:

According to the equivalent operation circuit, the initial model of the battery core operating voltage is obtained, includes in the initial model The constant coefficient of unknown numerical value；

Based on the initial model, the operational data is carried out to approach process of fitting treatment, obtains each constant in the initial model The numerical value of coefficient；

2. the method according to claim 1, wherein the equivalent operation circuit further include: open-circuit voltage source, One resistance, capacitor and second resistance；

The capacitor is in parallel with the second resistance.

3. according to the method described in claim 2, it is characterized in that, obtaining the battery core work according to the equivalent operation circuit Make the initial model of voltage, comprising:

According to the equivalent operation circuit, the partial pressure of the first resistor, partial pressure of the second resistance, described dense is obtained respectively The partial pressure of poor polarization element and the open-circuit voltage, the open-circuit voltage are the voltage in the open-circuit voltage source, first electricity It include the constant system of unknown numerical value in the partial pressure of resistance, the partial pressure of the second resistance and the partial pressure of the concentration polarization element Number；

According to the open-circuit voltage, the partial pressure of the first resistor, the partial pressure of the second resistance and concentration polarization member The partial pressure of part generates the initial model of the battery core operating voltage.

4. according to the method described in claim 3, it is characterized in that,

When the working condition of the battery core is charged state, the initial model of the battery core operating voltage are as follows:

U_t=U_oc+U₁+U₂-U₃

U_t=U_oc-U₁-U₂+U₃

Wherein, U_tIndicate the battery core operating voltage, U_ocIndicate the open-circuit voltage of the battery core, U₁Indicate the first resistor Partial pressure, U₂Indicate the partial pressure of the second resistance, U₃Indicate the partial pressure of the concentration polarization element.

5. according to the method described in claim 3, it is characterized in that, obtaining the concentration polarization according to the equivalent operation circuit Change the partial pressure of element, comprising:

Wherein, U₃Indicate the partial pressure of the concentration polarization element, ∝ indicates polarization coefficient, wherein ∝=d1 × SOC^d2, τ expression Transit time, whereinB is the first coefficient, B=g1 × I^g2×e^g3×T, E_aFor the second coefficient, Indicate diffusion activation energy, E_a=f1 × SOC^f2, SOC indicates the remaining capacity of the battery core, when t indicates the work of the battery core Between, I indicates that the operating current of the battery core, T indicate operating temperature, and R is ideal gas constant, and F is Faraday constant, and n is object The amount of matter, d1, d2, g1, g2, g3, f1 and f2 are constant coefficient.

6. according to the method described in claim 3, it is characterized in that, obtaining second electricity according to the equivalent operation circuit The partial pressure of resistance, comprising:

Wherein, U₂Indicate the partial pressure of the second resistance, I indicates that the operating current of the battery core, t indicate the work of the battery core Time, R₂For the resistance value of the second resistance, wherein R₂=b1 × SOC^b2×e^b3×T, C is the capacitance of the capacitor, C=h1 ×SOC^h2×e^h3×T, b1, b2, b3, h1, h2 and h3 are constant coefficient, and T indicates operating temperature, and SOC indicates the surplus of the battery core Remaining electricity.

7. according to the method described in claim 3, it is characterized in that, obtaining first electricity according to the equivalent operation circuit The partial pressure of resistance, comprising:

By following formula, the partial pressure of the first resistor is obtained:

U₁=I × R₁

Wherein, U₁Indicate the partial pressure of the first resistor, I indicates the operating current of the battery core, R₁For the resistance of the first resistor Value, wherein R₁=a1 × SOC^a2×e^a3×T, a1, a2 and a3 are constant coefficient, and T indicates operating temperature, and SOC indicates the electricity The remaining capacity of core.

8. according to method described in claim 5 or 6 or 7, which is characterized in that

Wherein, SOC₀Indicate the initial quantity of electricity of the battery core, C₀For the battery core rated capacity, I indicates the work electricity of the battery core Stream, t indicate the working time of the battery core.

9. being carried out the method according to claim 1, wherein being based on the initial model to the operational data Process of fitting treatment is approached, the numerical value of each constant coefficient in the initial model is obtained, comprising:

In several fitting voltage curves, obtain bent with the highest fitting voltage of the approximation ratio of the real voltage curve Line is aim curve；

The numerical value for obtaining each constant coefficient in the aim curve, using the numerical value as each constant coefficient in the initial model.

10. the method according to claim 1, wherein according to the numerical value of each constant coefficient and the initial model, Obtain the acquisition model of the battery core operating voltage, comprising:

The numerical value for each constant coefficient that will acquire substitutes into the initial model, obtains the acquisition model of the battery core operating voltage.

11. a kind of battery core voltage acquisition methods, which is characterized in that the described method includes:

The battery core operating voltage is obtained using the acquisition model of battery core operating voltage based on the operational data；The battery core The acquisition model of operating voltage is the mould obtained using battery core model generating method described in any one of any one of claims 1 to 10 10 Type.

12. a kind of battery core model generating means, which is characterized in that described device includes:

First acquisition unit, for obtaining the equivalent operation circuit of battery core, the equivalent operation circuit includes: concentration polarization electricity Road；

Second acquisition unit, it is described for obtaining the initial model of the battery core operating voltage according to the equivalent operation circuit It include the constant coefficient of unknown numerical value in initial model；

Acquisition unit, for acquiring the operational data of the battery core, the operational data include: the working time, operating current and Operating voltage；

Processing unit carries out the operational data to approach process of fitting treatment, obtain described initial for being based on the initial model The numerical value of each constant coefficient in model；

Third acquiring unit obtains the battery core operating voltage for the numerical value and the initial model according to each constant coefficient Acquisition model.

13. device according to claim 12, which is characterized in that the equivalent operation circuit further include: open-circuit voltage source, First resistor, capacitor and second resistance；

The capacitor is in parallel with the second resistance.

14. device according to claim 13, which is characterized in that the second acquisition unit is used for:

15. device according to claim 14, which is characterized in that

U_t=U_oc+U₁+U₂-U₃

U_t=U_oc-U₁-U₂+U₃

16. device according to claim 14, which is characterized in that the second acquisition unit is specifically used for:

17. device according to claim 14, which is characterized in that the second acquisition unit is specifically used for:

18. device according to claim 14, which is characterized in that the second acquisition unit is specifically used for:

By following formula, the partial pressure of the first resistor is obtained:

U₁=I × R₁

19. device described in 6 or 17 or 18 according to claim 1, which is characterized in that the second acquisition unit, it is also specific to use In:

20. device according to claim 12, which is characterized in that the processing unit is specifically used for:

21. device according to claim 12, which is characterized in that the third acquiring unit is specifically used for:

22. a kind of battery core voltage acquisition apparatus, which is characterized in that described device includes:

Acquiring unit, using the acquisition model of battery core operating voltage, obtains the battery core work for being based on the operational data Voltage；The acquisition model of the battery core operating voltage is to be generated using battery core model described in any one of any one of claims 1 to 10 10 The model that method obtains.

23. a kind of battery management system, which is characterized in that the battery management system includes:

Such as the described in any item battery core model generating means of claim 12 to 21；And

Battery core voltage acquisition apparatus described in claim 22.