CN108957338B - The extracting method of power battery internal short-circuit electric current - Google Patents
The extracting method of power battery internal short-circuit electric current Download PDFInfo
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Abstract
This application involves a kind of extracting methods of power battery internal short-circuit electric current.In the application, a kind of extracting method of power battery internal short-circuit electric current is provided.The method includes providing the battery modules including multiple equivalent parallel branches.Within the external loading electric current null Δ t time, the variable quantity of parallel branch electric current and each the parallel branch electric current of each described parallel branch under the effect of power battery electromotive force is measured.The euqalizing current generated under the effect of power battery electromotive force in each parallel branch is calculated according to the variable quantity of each parallel branch electric current.The euqalizing current generated under the effect of power battery electromotive force is subtracted by the actual current of the parallel branch, the internal short-circuit electric current generated under the effect of power battery electromotive force is calculated.This method eliminates the internal short-circuit electric current and euqalizing current generated under battery modules act under external loading effect by the zero load moment when battery modules are run.
Description
Technical field
This application involves battery technology fields, and in particular to a kind of extracting method of power battery internal short-circuit electric current.
Background technique
Under energy deficiency and the dual-pressure of problem of environmental pollution, the application of new energy has become irreversible
Development in science and technology trend.In automobile dynamic system, power battery is because it is with high-energy-density, low self-discharge rate long circulating longevity
The characteristics of life, has become one of the main selection in electric powered motor source.
However, power battery is easy to happen thermal runaway accident.The triggering form that power battery internal short-circuit is abused as electricity
One kind is one of most common inducement in power battery thermal runaway accident.In power battery use process, internal short-circuit is from generation
To the final time caused thermal runaway and need to undergo a few hours.In order to avoid the generation of thermal runaway, occurs and develop in internal short-circuit
This few hours in, need to detected internal short-circuit using reliable and effective internal short-circuit detection method.For example, traditional is interior short
Road detection method has the internal short-circuit electric current by detecting parallel branch to identify internal short-circuit.But battery modules consistency compared with
In the case that aging occurs for difference or battery modules, the electric current caused due to internal short-circuit and the electric current meeting due to inconsistency initiation
Mutually cover, interfere with internal short-circuit identification signal, thus can not accurate detection to internal short-circuit electric current.
Summary of the invention
In view of this, it is necessary to traditional scheme can not accurate detection to internal short-circuit electric current aiming at the problem that, provide one
The extracting method of kind power battery internal short-circuit electric current.
A kind of extracting method of power battery internal short-circuit electric current, comprising the following steps:
S100, provides battery modules, and the battery modules include multiple equivalent parallel branches；
S200 applies external loading electric current I to the parallel branch0, it is negative in outside to measure each described parallel branch
Carry electric current I0Parallel branch electric current I under effecta1,Ia2,…,IaN,Ia(N+1), wherein subscript a1, a2 ... aN, a (N+1) are indicated
There are N+1 current detecting point in N number of parallel branch, N is the number of the parallel branch, and N is positive integer；
S300, in external loading electric current I0In the Δ t time equal to 0, each described parallel branch is measured in power electric
Parallel branch electric current I under the effect of pond electromotive forceA1,IA2,…,IAN,IA(N+1)With the variation of parallel branch electric current described in each
Measure Δ IA1,ΔIA2,…,ΔIAN,ΔIA(N+1), wherein subscript A1, A2 ..., AN, A (N+1) are indicated in N number of parallel branch
There are N+1 current detecting point, Δ IA1=Ia1-IA1, Δ IA2=Ia2-IA2..., Δ IAN=IaN-IAN, Δ IA1=Ia(N+1)-
IA(N+1)；
S400, according to the variation delta I of each parallel branch electric currentA1,ΔIA2,…,ΔIAN,ΔIA(N+1)It calculates each
The euqalizing current I generated under the effect of power battery electromotive force in a parallel branchA12,IA22,…,IAN2,IA(N+1)2；
S500, according to the internal short-circuit electric current I generated under the effect of power battery electromotive force1Equal to the reality of the parallel branch
Border electric current I subtracts the euqalizing current I generated under the effect of power battery electromotive force2, it is calculated and makees in power battery electromotive force
With the internal short-circuit electric current I of lower generation1；
The step S400, comprising:
S410, according to variation delta I of each parallel branch electric current within the Δ t timeA1,ΔIA2,…,ΔIAN,Δ
IA(N+1)And formulaCalculating ratio relationship factor αA1, αA2... αAN, αA(N+1), wherein i indicated for 1 appointing into N+1
Meaning positive integer；
S420, according to the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1)The typical case of the proportionate relationship factor is calculated
Value
S430, according to formulaThe representative value of the proportionate relationship factorAnd each parallel branch
The variation delta I of electric currentA1,ΔIA2,…,ΔIAN,ΔIA(N+1), it is calculated in each parallel branch in power battery electricity
The lower euqalizing current I generated of kinetic potential effectA12,IA22,…,IAN2,IA(N+1)2。
In one embodiment, in the step S100:
The battery modules include N number of symmetrical annular topological circuit structure, each described symmetrical annular topological circuit knot
Structure includes multiple power batteries, and the anode of power battery described in each of symmetrical annular topological circuit structure is logical
It crosses conducting wire and is electrically connected to form the first loop, the cathode of multiple power batteries is electrically connected to form the second loop by conducting wire.
In one embodiment, in the step S100:
N+1 ammeter is set in first loop or second loop, to form N+1 current detecting
Point, for detecting the electric current of the parallel branch.
In one embodiment, the battery modules include: two concatenated symmetrical annular topological circuit structures, often
It include three power batteries in parallel in one symmetrical annular topological circuit structure.
In one embodiment, first loop is connected the anode of each power battery by a straight wire,
Second loop is connected the cathode of each power battery, the conductivity phase of each straight wire by another straight wire
Deng.
In one embodiment, the battery modules include six groups of symmetrical annular topological circuit structures being arranged in series, often
One group symmetrically annular topological circuit structure include eight lithium-ion-power cells being arranged in parallel.
In one embodiment, the step S420, comprising:
Remove the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1)In maximum value and minimum value after, by seeking
The intermediate value or average value of the remaining proportionate relationship factor obtain the representative value of the proportionate relationship factor
In one embodiment, before the step S200 further include:
S110 is applying external loading electric current I to the battery modules0When, parallel connection described in the battery modules is propped up
The electric current composition on road is analyzed, to obtain any one of parallel branch in external loading electric current I0Practical electricity under effect
Flow IThere is load, the parallel branch is in external loading electric current I0Actual current I under effectThere is loadMake equal in power battery electromotive force
With the internal short-circuit electric current I of lower generation1, under the effect of power battery electromotive force the euqalizing current I that generates2, outside batteries load make
With the internal short-circuit electric current I of lower generation3With the euqalizing current I generated under outside batteries load effect4The sum of.
In one embodiment, the step S110, comprising:
S111, it is equivalent to battery modules progress, equation is listed according to node current law to the battery modules
Group；
The set of equations is carried out simultaneous solution, chooses a parallel branch ab by S112, be calculated it is described simultaneously
Join the parallel branch electric current I of branch abab, meet following formula:
Wherein, IabFor the parallel branch electric current that internal short-circuit occurs one of in the parallel branch, A1, A2, B1, B2,
B3, B4For constant；I0For external loading electric current；RISCrFor internal short-circuit resistance value；
S113 carries out factorization to the formula in the step S112, obtains:
Wherein, Iab1For the internal short-circuit electric current generated under the effect of power battery electromotive force, Iab2It is electronic in power battery
The lower euqalizing current generated of gesture effect, Iab3For the internal short-circuit electric current generated under outside batteries load effect, Iab4For in battery
The lower euqalizing current generated of external loading effect.
In one embodiment, in the step S112, as external loading electric current I0When being 0,
After carrying out factorization, obtain:
For the internal short-circuit electric current that generates under the effect of power battery electromotive force,
For the euqalizing current generated under the effect of power battery electromotive force.
In the application, a kind of extracting method of power battery internal short-circuit electric current is provided.The method includes providing battery mould
Group, the battery modules include multiple equivalent parallel branches.Within the external loading electric current null Δ t time, measurement is every
Parallel branch electric current and each described parallel branch electric current of one parallel branch under the effect of power battery electromotive force
Variable quantity.It is calculated according to the variable quantity of each parallel branch electric current electronic in power battery in each parallel branch
The lower euqalizing current generated of gesture effect.It is subtracted by the actual current of the parallel branch and is produced under the effect of power battery electromotive force
The internal short-circuit electric current generated under the effect of power battery electromotive force is calculated in raw euqalizing current.This method passes through in battery
Zero load moment when mould group is run eliminates under battery modules act under external loading effect the internal short-circuit electric current that generates and
Weigh electric current.This method effective solution internal short-circuit detects problems faced, enables internal short-circuit detection method more accurate
Ground detected the internal short-circuit of lithium-ion-power cell.This method helps to improve the reliability of power battery safety management,
To reduce the generation of power battery safety hazards.
Detailed description of the invention
Fig. 1 is the flow diagram of the extracting method of power battery internal short-circuit electric current described in the application one embodiment；
Fig. 2 is the structural schematic diagram of battery modules described in the application one embodiment；
Fig. 3 is the structural schematic diagram of symmetrical annular topological circuit structure described in another embodiment of the application；
Fig. 4 is in the application one embodiment, and equivalent circuit diagram when internal short-circuit occurs for the battery modules；
Fig. 5 is each parallel branch electric current for measuring under zero load condition in the application one embodiment；
Fig. 6 is to generate under cell emf effect in each parallel branch for extracting in the application one embodiment
Internal short-circuit electric current.
Drawing reference numeral explanation:
Power battery 100
Symmetrical annular topological circuit structure 200
Battery modules 300
Specific embodiment
Referring to Fig. 1, a kind of extracting method of power battery internal short-circuit electric current.The method uses a kind of battery modules
300, the structure of the battery modules 300 is as shown in Figure 2.The battery modules 300 may include N number of symmetrical annular topological circuit
Structure 200.Each described symmetrical annular topological circuit structure 200 includes multiple power batteries 100.One symmetrical annular
The anode of power battery 100 described in each of topological circuit structure 200 is electrically connected to form the first loop by conducting wire, multiple
The cathode of the power battery 100 is electrically connected to form the second loop by conducting wire.
In one embodiment, first loop is connected the anode of each power battery by a straight wire.
Second loop is connected the cathode of each power battery, the conductivity phase of each straight wire by another straight wire
Deng.In the present embodiment, the conductivity of every straight wire is equal can accurately calculate occur power battery internal short-circuit and there is no
Line hinders when power battery internal short-circuit.
The power battery 100 is the power supply in powered tools source.It is electronic that the power battery 100, which can be,
Automobile, electric train, electric bicycle, golf cart provide the battery of power.The power battery 100 can use valve
Mouth sealed type lead acid battery, opened type tube type lead-acid accumulator and lithium iron phosphate storage battery.The power battery 100 can be with
It is lead-acid accumulator, nickel-cadmium storage battery, nickel hydrogen storage battery iron-nickel storage battery, sodium chlorination ickel accumulator, silver-zinc storage battery, sodium sulphur storage
Battery, lithium storage battery, air accumulator, fuel cell, solar storage battery, over capacity capacitor, flying wheel battery or sodium sulphur
Battery.The application is using lithium battery as experimental subjects.
For example, showing a kind of form of the battery modules 300 in Fig. 2, the battery modules 300 include described in 2 groups
Symmetrical annular topological circuit structure 200.Symmetrical annular topological circuit structure 200 described in showing each group in Fig. 3 include 3 simultaneously
The power battery 100 of connection.Shown in Fig. 4 shown in Fig. 23 and 2 string the battery modules occur internal short-circuit when etc.
Imitate circuit diagram.In one embodiment, the battery modules may include the M concatenated symmetrical annular topological circuit knots
Structure.It include m power battery in parallel in each described symmetrical annular topological circuit structure.Here M and m can be according to this
The needs of field technical staff are designed, and are not limited to specific number.The power battery 100 as described in being illustrated Fig. 4
Electromotive force is respectively E11、E12、E13、E21、E22、E23.The internal resistance of power battery 100 is respectively R as described in Fig. 4 is illustrated simultaneously11、
R12、R13、R21、R22、R23.Marked as E22The power battery 100 have occurred internal short-circuit, the resistance value of internal short-circuit is RISCr.Institute
The line resistance for stating parallel branch is respectively Rab、Rbc、Rca.Multiple current detecting points are set in the battery modules 300, to realize
Detection to 300 electric current of battery modules.For example, N+1 can be arranged in first loop or second loop
A ammeter, to form N+1 current detecting point, for detecting the electric current of the parallel branch.The battery modules 300 it is total
Electric current is I0.Flow through R11、R12、R13、R21、R22、R23Electric current be respectively I11、I12、I13、I21、I22、I23.Of course it is to be understood that
The battery modules 300 can also include other structure types.The battery modules 300 shown in Fig. 2 are based in the application
Carry out following method and steps.
Referring again to Fig. 1, the extracting method of the power battery internal short-circuit electric current the following steps are included:
S100, provides battery modules 300, and the battery modules include multiple equivalent parallel branches.
In this step, the battery modules 300 can be using the battery modules of 3 and 2 strings as shown in Figure 2.Specific connection
It forms the method and steps of the battery modules 300 and is not construed as limiting.
S200 applies external loading electric current I to the parallel branch0, it is negative in outside to measure each described parallel branch
Carry electric current I0Parallel branch electric current I under effecta1,Ia2,…,IaN,Ia(N+1)Wherein subscript a1, a2 ... aN, a (N+1) are indicated
There are N+1 current detecting point in N number of parallel branch, N is the number of the parallel branch, and N is positive integer.
In this step, current detecting point can be set, the electric current of the parallel branch is detected.To the branch in parallel
Road applies external loading electric current I0, each described parallel branch is measured in external loading electric current I0Parallel branch electricity under effect
Flow Ia1,Ia2,…,IaN,Ia(N+1).In this step, detected by current detecting point in external loading electric current I0Under the action of simultaneously
The efficiency and precision of current detecting can be improved in connection branch current.
S300, in external loading electric current I0In the Δ t time equal to 0, each described parallel branch is measured in power electric
Parallel branch electric current I under the effect of pond electromotive forceA1,IA2,…,IAN,IA(N+1)With the variation of parallel branch electric current described in each
Measure Δ IA1,ΔIA2,…,ΔIAN,ΔIA(N+1).Wherein subscript A1, A2 ..., AN, A (N+1) are indicated in N number of parallel branch
There are N+1 current detecting points.ΔIA1=Ia1-IA1, Δ IA2=Ia2-IA2..., Δ IAN=IaN-IAN, Δ IA1=Ia(N+1)-
IA(N+1)。
In this step, detected by each current detecting point in external loading electric current I0The parallel connection in the Δ t time equal to 0
Branch current IA1,IA2,…,IAN,IA(N+1).By the parallel branch in external loading electric current I0Parallel branch electricity under effect
Flow Ia1,Ia2,…,IaN,Ia(N+1)With parallel branch electric current I of the parallel branch under the effect of power battery electromotive forceA1,
IA2,…,IAN,IA(N+1)Make difference and obtains the variation delta I of the parallel branch electric currentA1,ΔIA2,…,ΔIAN,ΔIA(N+1)。
Please referring to Fig. 5 is each parallel branch electric current I for measuring under zero load condition in the application one embodimentA1,
IA2,IA3,IA4,IA5,IA6,IA7。
S400, according to the variation delta I of each parallel branch electric currentA1,ΔIA2,…,ΔIAN,ΔIA(N+1)It calculates each
The euqalizing current I generated under the effect of power battery electromotive force in a parallel branchA12,IA22,…,IAN2,IA(N+1)2。
In this step, according in the available parallel branch of the variable quantity of the parallel branch electric current in power battery
The lower euqalizing current generated of electromotive force effect.Specifically, euqalizing current of the power battery under electromotive force effect can be by applying
The current variation value of parallel circuit in the case where adding external loading electric current and not applying external loading electric current is calculated.
S500, according to the internal short-circuit electric current I generated under the effect of power battery electromotive force1Equal to the reality of the parallel branch
Border electric current I subtracts the euqalizing current I generated under the effect of power battery electromotive force2, it is calculated and makees in power battery electromotive force
With the internal short-circuit electric current I of lower generation1。
In this step, by detect the obtained actual current I of the parallel branch and be calculated in power battery
The lower euqalizing current I generated of electromotive force effect2It is poor to make, and obtains the internal short-circuit electric current I generated under the effect of power battery electromotive force1。
Please referring to Fig. 6 is in generating under cell emf effect in each parallel branch for extracting in the application one embodiment
Short circuit current.
In the present embodiment, the extracting method of the power battery internal short-circuit electric current, which is used, extracts internal short-circuit in zero load moment
The method of characteristic current.This method eliminates battery modules in external loading by the zero load moment when battery modules are run
The lower internal short-circuit electric current and euqalizing current generated of the lower effect of effect.Simultaneously using euqalizing current variable quantity in the zero load time and
Proportionate relationship between the size of current that weighs eliminates the euqalizing current generated under acting under the effect of power battery electromotive force, finally
Extract the internal short-circuit electric current generated under acting under electromotive force effect.The internal short-circuit detection of this method effective solution faces
Problem enables internal short-circuit detection method more accurately to detected the internal short-circuit of lithium-ion-power cell.This method
The reliability of power battery safety management is helped to improve, to reduce the generation of power battery safety hazards.
In one embodiment, the step S400 includes:
S410, according to variation delta I of each parallel branch electric current within the Δ t timeA1,ΔIA2,…,ΔIAN,Δ
IA(N+1)And formulaCalculating ratio relationship factor αA1, αA2... αAN, αA(N+1), wherein i indicated for 1 appointing into N+1
Meaning positive integer.
In this step, according to formulaCalculate the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1).This step
In rapid, variation delta I of each parallel branch electric current within the Δ t timeA1,ΔIA2,…,ΔIAN,ΔIA(N+1)It can lead to
Cross being calculated for above-mentioned steps S300.
S420, according to the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1)The typical case of the proportionate relationship factor is calculated
Value
Available multiple proportionate relationship factor-alphas in this stepA1, αA2... αAN, αA(N+1).In one embodiment,
By removing the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1)In maximum value and minimum value after, seek described in residue
The intermediate value or average value of the proportionate relationship factor obtain the representative value of the proportionate relationship factorIn this step, acquisition it is described
The representative value of the proportionate relationship factorIt is the representative value for removing the proportionate relationship factor after noise.The proportionate relationship because
The representative value of sonIt is more accurate, so that the internal short-circuit generated under the effect of power battery electromotive force that the method finally obtains
Electric current is relatively reliable.
S430, according to formulaThe representative value of the proportionate relationship factorAnd each parallel branch
The variation delta I of electric currentA1,ΔIA2,…,ΔIAN,ΔIA(N+1), it is calculated in each parallel branch in power battery electricity
The lower euqalizing current I generated of kinetic potential effectA12,IA22,…,IAN2,IA(N+1)2。
In this step, pass through formulaIt is calculated in each parallel branch in power battery electromotive force
The lower euqalizing current I generated of effectA12,IA22,…,IAN2,IA(N+1)2.FormulaIt can accurately obtain each described
The euqalizing current I generated under the effect of power battery electromotive force in parallel branchA12,IA22,…,IAN2,IA(N+1)2。
In the present embodiment, a kind of method for obtaining euqalizing current is proposed.The method used in this implementation can pass through essence
The euqalizing current generated under the effect of power battery electromotive force in each parallel branch is really calculated.
In one embodiment, before the step S200 further include:
S110 is applying external loading electric current I to the battery modules0When, parallel connection described in the battery modules is propped up
The electric current composition on road is analyzed, to obtain any one of parallel branch in external loading electric current I0Practical electricity under effect
Flow IThere is load, the parallel branch is in external loading electric current I0Actual current I under effectThere is loadMake equal in power battery electromotive force
With the internal short-circuit electric current I of lower generation1, under the effect of power battery electromotive force the euqalizing current I that generates2, outside batteries load make
With the internal short-circuit electric current I of lower generation3With the euqalizing current I generated under outside batteries load effect4The sum of.
In one embodiment, the step S110, comprising:
S111, it is equivalent to battery modules progress, equation is listed according to node current law to the battery modules
Group；
The set of equations is carried out simultaneous solution, chooses a parallel branch ab by S112, be calculated it is described simultaneously
Join the parallel branch electric current I of branch abab, meet following formula:
Wherein, IabFor the parallel branch electric current that internal short-circuit occurs one of in the parallel branch, A1, A2, B1, B2,
B3, B4For constant；I0For external loading electric current；RISCrFor internal short-circuit resistance value；
S113 carries out factorization to the formula in the step S112, obtains:
Wherein, Iab1For the internal short-circuit electric current generated under the effect of power battery electromotive force, Iab2It is electronic in power battery
The lower euqalizing current generated of gesture effect, Iab3For the internal short-circuit electric current generated under outside batteries load effect, Iab4For in battery
The lower euqalizing current generated of external loading effect.
In one embodiment, in the step S112, as external loading electric current I0When being 0,
After carrying out factorization, obtain:
For the internal short-circuit electric current that generates under the effect of power battery electromotive force,
For the euqalizing current generated under the effect of power battery electromotive force.
In the present embodiment, by formulaIt can be seen that
As the load current I for being applied to the parallel branch0When being zero, the actual current of the parallel branch is equal to dynamic
The lower internal short-circuit electric current I generated of power cell emf effect1, i.e.,Make in power battery electromotive force
With the euqalizing current I of lower generation2, i.e.,The sum of.
As application external loading electric current I0In the parallel branch, obtained actual current IThere is loadEqual in power battery
The lower internal short-circuit electric current I generated of electromotive force effect1, i.e.,It is generated under the effect of power battery electromotive force
Euqalizing current I2, i.e.,The internal short-circuit electric current I generated under outside batteries load effect3, i.e.,With the euqalizing current I generated under outside batteries load effect4, i.e.,
The sum of.
In a specific embodiment, the extracting method of the power battery internal short-circuit electric current includes:
Select a lithium-ion-power cell.Selected lithium-ion-power cell composition is met into symmetrical annular topological circuit
The battery modules of structure.For example the battery modules of 8 and 6 strings can be formed.The battery modules of 8 and 6 strings include 6 groups and are arranged in series
Symmetrical annular topological circuit structure, each group symmetrically annular topological circuit structure include 8 lithium ion powers being arranged in parallel electricity
Pond.Ammeter is arranged in the parallel branch of battery modules (can be set A1,A2,…,A7, the number of specific ammeter can be with
It is increased and decreased according to actual needs) to detect the actual current value of each parallel branch.
External loading electric current I is applied to battery modules0, use ammeter A1,A2,…,A7The electricity of parallel branch is measured simultaneously
Flow IA1,IA2,…,IA7.Applying external loading electric current I0When, it each measures parallel branch electric current and is made of four parts, respectively
Are as follows: the internal short-circuit electric current I generated under cell emf effectA11,IA21,…,IA71, generated under cell emf effect
Euqalizing current IA12,IA22,…,IA72, the internal short-circuit electric current I that is generated under outside batteries load effectA13,IA23,…,IA73With
The euqalizing current I generated under outside batteries load effectA13,IA23,…,IA73；
In external loading electric current I0At the time of equal to 0 (i.e. zero load moment), ammeter A is used1,A2,…,A7It surveys simultaneously
Measure the electric current I of parallel branchA1,IA2,…,IA7.It each measures parallel branch electric current and consists of two parts and be respectively as follows: in battery
The lower internal short-circuit electric current I generated of electromotive force effectA11,IA21,…,IA71With the euqalizing current generated in the case where cell emf acts on
IA12,IA22,…,IA72。
Annular topological circuit symmetrical for all 6, in external loading electric current I0(i.e. zero in a period of time Δ t equal to 0
In load time), measure each parallel branch electric current IA1,IA2,…,IA7Variation delta IA1,ΔIA2,…,ΔIA7, according to formulaCalculating ratio relationship factor αA1,αA2,…,αA7。
Remove proportionate relationship factor-alphaA1,αA2,…,αA7In maximum value and minimum value after, by seeking remaining proportion relationship
The intermediate value or average value of the factor obtain the representative value of the proportionate relationship factor
According to formulaUsing the representative value of the proportionate relationship factorAnd the variation of each parallel branch electric current
Measure Δ IA1,ΔIA2,…,ΔIA7, calculate the euqalizing current I generated under cell emf effect in each parallel branchA12,
IA22,…,IA72。
According to formula Ii1=I-Ii2, use the electric current I in each parallel branchA1,IA2,…,IA7With in each parallel branch
The lower euqalizing current I generated of cell emf effectA12,IA22,…,IA72, calculate in each parallel branch and acted in cell emf
The internal short-circuit electric current I of lower generationA11,IA21,…,IA71。
In the present embodiment, within the external loading electric current null Δ t time, each described parallel branch is measured dynamic
The variable quantity of parallel branch electric current and each parallel branch electric current under the effect of power cell emf.According to each described
The variable quantity of parallel branch electric current calculates the equilibrium electricity generated under the effect of power battery electromotive force in each parallel branch
Stream.The euqalizing current generated under the effect of power battery electromotive force is subtracted by the actual current of the parallel branch, is calculated
The internal short-circuit electric current generated under the effect of power battery electromotive force out.When this method is by zero load when battery modules are run
It carves, eliminates the internal short-circuit electric current and euqalizing current generated under battery modules act under external loading effect.This method is effective
It solves internal short-circuit detection problems faced, enables internal short-circuit detection method more accurately by lithium-ion-power cell
Internal short-circuit detected.This method helps to improve the reliability of power battery safety management, to reduce power battery safety
The generation of sexual behavior event.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to claim therefore cannot be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of extracting method of power battery internal short-circuit electric current, which comprises the following steps:
S100, provides battery modules, and the battery modules include multiple equivalent parallel branches；
S200 applies external loading electric current I to the parallel branch0, each described parallel branch is measured in external loading electric current
I0Parallel branch electric current I under effecta1,Ia2,…,IaN,Ia(N+1), wherein subscript a1, a2 ... aN, a (N+1) are indicated in N number of institute
It states there are N+1 current detecting point in parallel branch, N is the number of the parallel branch, and N is positive integer；
S300, in external loading electric current I0In the Δ t time equal to 0, it is electronic in power battery to measure each described parallel branch
Parallel branch electric current I under gesture effectA1,IA2,…,IAN,IA(N+1)With the variation delta I of parallel branch electric current described in eachA1,
ΔIA2,…,ΔIAN,ΔIA(N+1), wherein subscript A1, A2 ..., AN, A (N+1) indicate that there are N+1 in N number of parallel branch
A current detecting point, Δ IA1=Ia1-IA1, Δ IA2=Ia2-IA2..., Δ IAN=IaN-IAN, Δ IA1=Ia(N+1)-IA(N+1)；
S400, according to the variation delta I of each parallel branch electric currentA1,ΔIA2,…,ΔIAN,ΔIA(N+1)Calculate each institute
State the euqalizing current I generated under the effect of power battery electromotive force in parallel branchA12,IA22,…,IAN2,IA(N+1)2；
S500, according to the internal short-circuit electric current I generated under the effect of power battery electromotive force1Equal to the practical electricity of the parallel branch
Stream I subtracts the euqalizing current I generated under the effect of power battery electromotive force2, it is calculated under the effect of power battery electromotive force
The internal short-circuit electric current I of generation1；
The step S400, comprising:
S410, according to variation delta I of each parallel branch electric current within the Δ t timeA1,ΔIA2,…,ΔIAN,Δ
IA(N+1)And formulaCalculating ratio relationship factor αA1, αA2... αAN, αA(N+1), wherein i indicated for 1 appointing into N+1
Meaning positive integer；
S420, according to the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1)The representative value of the proportionate relationship factor is calculated
S430, according to formulaThe representative value of the proportionate relationship factorAnd each parallel branch electric current
Variation delta IA1,ΔIA2,…,ΔIAN,ΔIA(N+1), it is calculated in each parallel branch in power battery electromotive force
The lower euqalizing current I generated of effectA12,IA22,…,IAN2,IA(N+1)2。
2. the extracting method of power battery internal short-circuit electric current as described in claim 1, which is characterized in that the step S100
In:
The battery modules include N number of symmetrical annular topological circuit structure, each described symmetrical annular topological circuit structure packet
Multiple power batteries are included, the anode of power battery described in each of symmetrical annular topological circuit structure is by leading
Line is electrically connected to form the first loop, and the cathode of multiple power batteries is electrically connected to form the second loop by conducting wire.
3. the extracting method of power battery internal short-circuit electric current as claimed in claim 2, which is characterized in that the step S100
In:
N+1 ammeter is set in first loop or second loop, to form N+1 current detecting point, is used
In the electric current for detecting the parallel branch.
4. the extracting method of power battery internal short-circuit electric current as claimed in claim 2, which is characterized in that the battery modules packet
Include: two concatenated symmetrical annular topological circuit structures include three in each described symmetrical annular topological circuit structure
The power battery of a parallel connection.
5. the extracting method of power battery internal short-circuit electric current as claimed in claim 2, which is characterized in that first loop by
A piece straight wire connects the anode of each power battery, and second loop connects each institute by another straight wire
The cathode of power battery is stated, the conductivity of each straight wire is equal.
6. the extracting method of power battery internal short-circuit electric current as claimed in claim 5, which is characterized in that the battery modules packet
Include six groups of symmetrical annular topological circuit structures being arranged in series, each group symmetrically annular topological circuit structure include that eight parallel connections are set
The lithium-ion-power cell set.
7. the extracting method of power battery internal short-circuit electric current as claimed in claim 6, which is characterized in that the step S420,
Include:
Remove the proportionate relationship factor-alphaA1, αA2... αAN, αA(N+1)In maximum value and minimum value after, by seeking residue
The intermediate value or average value of the proportionate relationship factor obtain the representative value of the proportionate relationship factor
8. the extracting method of power battery internal short-circuit electric current as described in claim 1, which is characterized in that in the step S200
Before further include:
S110 is applying external loading electric current I to the battery modules0When, to the electricity of parallel branch described in the battery modules
Stream composition is analyzed, to obtain any one of parallel branch in external loading electric current I0Actual current under effect
IThere is load, the parallel branch is in external loading electric current I0Actual current I under effectThere is loadIt is acted on equal in power battery electromotive force
The internal short-circuit electric current I of lower generation1, under the effect of power battery electromotive force the euqalizing current I that generates2, in outside batteries load effect
The internal short-circuit electric current I of lower generation3With the euqalizing current I generated under outside batteries load effect4The sum of.
9. the extracting method of power battery internal short-circuit electric current as claimed in claim 8, which is characterized in that the step S110,
Include:
S111, it is equivalent to battery modules progress, set of equations is listed according to node current law to the battery modules；
The set of equations is carried out simultaneous solution, chooses a parallel branch ab by S112, and the branch in parallel is calculated
The parallel branch electric current I of road abab, meet following formula:
Wherein, IabFor the parallel branch electric current that internal short-circuit occurs one of in the parallel branch, A1, A2, B1, B2, B3, B4For
Constant；I0For external loading electric current；RISCrFor internal short-circuit resistance value；
S113 carries out factorization to the formula in the step S112, obtains:
Wherein, Iab1For the internal short-circuit electric current generated under the effect of power battery electromotive force, Iab2To make in power battery electromotive force
With the euqalizing current of lower generation, Iab3For the internal short-circuit electric current generated under outside batteries load effect, Iab4For in outside batteries
The euqalizing current generated under load effect.
10. the extracting method of power battery internal short-circuit electric current as claimed in claim 9, which is characterized in that in the step
In S112, as external loading electric current I0When being 0,
After carrying out factorization, obtain:
For the internal short-circuit electric current that generates under the effect of power battery electromotive force,
For the euqalizing current generated under the effect of power battery electromotive force.
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