CN107607778A - Circuit and method for detecting current in high-voltage circuit of battery, detector, battery device, vehicle and computer storage readable medium - Google Patents

Circuit and method for detecting current in high-voltage circuit of battery, detector, battery device, vehicle and computer storage readable medium Download PDF

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Publication number
CN107607778A
CN107607778A CN201710993794.XA CN201710993794A CN107607778A CN 107607778 A CN107607778 A CN 107607778A CN 201710993794 A CN201710993794 A CN 201710993794A CN 107607778 A CN107607778 A CN 107607778A
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China
Prior art keywords
resistance
voltage
loop
magnitude
preliminary filling
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Granted
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CN201710993794.XA
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CN107607778B (en
Inventor
张伟
但志敏
罗杰超
侯贻真
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the invention provides a current detection circuit and method in a battery high-voltage loop, a detector, a battery device, a carrying tool and a computer storage readable medium, which are used for solving the problem of low accuracy of a current value of a battery module acquired by the current detection circuit in the prior art. The invention provides a current detection circuit in a high-voltage circuit of a battery, which comprises a processing assembly and a resistor, wherein the resistor comprises a negative electrode connecting end and a non-negative electrode connecting end, the negative electrode connecting end and the non-negative electrode connecting end are both connected to the processing assembly, the pre-charging circuit comprises a positive electrode connecting end and a non-positive electrode connecting end, the positive electrode connecting end and the non-positive electrode connecting end are both connected to the processing assembly, and the non-positive electrode connecting end and the non-negative electrode connecting end are connected. The circuit is integrated in a high-voltage loop, connecting wires among all components in the circuit are short, current consumption is reduced, and accuracy of a current value of the battery module is improved.

Description

Current detection circuit and method, detector, cell apparatus, fortune in cell high voltage loop Load instrument and computer storage computer-readable recording medium
【Technical field】
The present invention relates to current detection circuit in field of circuit technology, more particularly to a kind of cell high voltage loop and method, Detector, cell apparatus, delivery vehicle and computer storage computer-readable recording medium.
【Background technology】
At present, the safety problem of the battery in various delivery vehicles (can claim battery modules hereinafter) has turned into all circles' concern Emphasis.In order to reduce security risks of the battery modules in power supply, it is necessary to be detected to the electric current of battery modules, to avoid Safety issue caused by the electric currents of battery modules is excessive.
The electric current of battery modules is typically obtained with current detection circuit, current detection circuit is connected to the positive pole of battery modules Between negative pole, because current detection circuit and battery modules are cascaded, electric current is equal everywhere in series circuit, therefore, Current value using the current value of the resistance in the current detection circuit that current detection circuit is got as battery modules.
But because in the prior art, each component in current detection circuit is separately positioned in different loops, is led The connecting line sent a telegraph between each component in current detection circuit is longer, and the current propagation path in current detection circuit is longer, Electric current consume it is more so that the accuracy of the current value of the resistance in the current detection circuit that current detection circuit is got compared with Low, this just causes the accuracy of the current value of the battery modules got relatively low.
【The content of the invention】
In view of this, the embodiments of the invention provide current detection circuit in a kind of cell high voltage loop and method, detection Device, cell apparatus, delivery vehicle and computer storage computer-readable recording medium, get to solve current detection circuit in the prior art Battery modules current value accuracy it is relatively low the problem of.
In a first aspect, the embodiments of the invention provide current detection circuit in a kind of cell high voltage loop, including：
Processing component；
Resistance, the resistance include negative pole connection end and non-negative pole connection end, the negative pole connection end and the non-negative pole Connection end is connected to the processing component；
Preliminary filling loop, the preliminary filling loop include anode connection terminal and non-anode connection terminal, the anode connection terminal and institute State non-anode connection terminal and be connected to the processing component, the non-anode connection terminal is connected with the non-negative pole connection end.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the treatment group Part, it is used for：
In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively；
Changed with time trend according to the magnitude of voltage at the resistance both ends, and obtained respectively at least three sampling instants The magnitude of voltage at the resistance both ends got, obtain first steady state voltage value at the resistance both ends.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the treatment group Part, it is additionally operable to：
In at least three sampling instant, the magnitude of voltage at preliminary filling loop both ends is obtained respectively；
Changed with time trend according to the magnitude of voltage at preliminary filling loop both ends, and when described at least three sample The magnitude of voltage at the preliminary filling loop both ends got is carved, obtains second steady state voltage value at preliminary filling loop both ends.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the treatment group Part, it is additionally operable to：
According to first steady state voltage value and the first resistor value of the resistance, the first stable state of the resistance is obtained Electric current, and according to second steady state voltage value and the second resistance value in the preliminary filling loop, obtain the preliminary filling loop Second steady-state current value；
According to first steady-state current value and second steady-state current value, whether the current detection circuit is judged It is working properly.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the preliminary filling return Road includes：
Switch and preliminary filling resistance, the switch, the preliminary filling resistance are connected on the anode connection terminal and described non- Between anode connection terminal, the switch is connected with the anode connection terminal, and the preliminary filling resistance connects with the non-anode connection terminal Connect.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the precharge Resistance includes：
At least one resistance；And/or
At least one electric resistance array.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the preliminary filling return Road also includes：
Counnter attack connected components, the counnter attack connected components are connected between the anode connection terminal and the switch.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, in addition to：
Isolation strip, it is arranged at the fringe region that the processing component is connected with low tension loop；
Power Supply Assembly, the both sides of isolation strip are arranged at, the first end of the Power Supply Assembly is connected with the processing component, institute State the second end of Power Supply Assembly and the power supply unit of peripheral hardware connects；
Communication component, the both sides of isolation strip are arranged at, the first end of the communication component is connected with the processing component, institute State the second end of communication component and the general control system of peripheral hardware connects.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, in addition to：
First partial pressure component, the anode connection terminal are connected by the first partial pressure component with the processing component, institute The first end for stating the first partial pressure component is connected with the anode connection terminal, the second end and the processing of the first partial pressure component Component connects, the 3rd end ground connection of the first partial pressure component；
Second partial pressure component, the negative pole connection end are connected by the second partial pressure component with the processing component, institute The first end for stating the second partial pressure component is connected with the non-anode connection terminal, the second end and the place of the second partial pressure component Manage component connection, the 3rd end ground connection of the second partial pressure component.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, described first point Pressure component includes：At least one resistance；And/or at least one electric resistance array；
The second partial pressure component includes：At least one resistance；And/or at least one electric resistance array.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, in addition to：
At least one load, the non-anode connection terminal are connected by least one load with the non-negative pole connection end Connect.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the switch are Transistor and/or relay.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the switch with The processing component connection.
Second aspect, the embodiments of the invention provide a kind of detector, including the battery of any of the above-described kind of implementation are high Push back current detection circuit in road.
The third aspect, the embodiments of the invention provide a kind of cell apparatus, the cell apparatus includes：
Battery modules, the battery modules include positive pole and negative pole；
Current detection circuit in the cell high voltage loop of any of the above-described kind of implementation, electric current in the cell high voltage loop Detection circuit is connected between the positive pole and the negative pole, and the anode connection terminal is connected with the positive pole, and the negative pole connects End is connect to be connected with the negative pole.
Fourth aspect, the embodiments of the invention provide a kind of high-voltage cage, including the battery of any of the above-described kind of implementation are high Push back current detection circuit in road.
5th aspect, the embodiments of the invention provide a kind of delivery vehicle, include the battery of any of the above-described kind of implementation Current detection circuit in high tension loop.
6th aspect, the embodiments of the invention provide electric current detecting method in a kind of cell high voltage loop, methods described should For including in current detection circuit in above-mentioned cell high voltage loop, being implemented in the processing component, methods described to include：
In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively；
Changed with time trend according to the magnitude of voltage at the resistance both ends, and obtained respectively at least three sampling instants The magnitude of voltage at the resistance both ends got, obtain first steady state voltage value at the resistance both ends.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, methods described is also Including：
In at least three sampling instant, the magnitude of voltage at preliminary filling loop both ends is obtained respectively；
Changed with time trend according to the magnitude of voltage at preliminary filling loop both ends, and when described at least three sample The magnitude of voltage at the preliminary filling loop both ends got is carved, obtains second steady state voltage value at preliminary filling loop both ends.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, methods described is also Including：
According to first steady state voltage value and the first resistor value of the resistance, the first stable state of the resistance is obtained Electric current, and according to second steady state voltage value and the second resistance value in the preliminary filling loop, obtain the preliminary filling loop Second steady-state current value；
According to first steady-state current value and second steady-state current value, whether the current detection circuit is judged It is working properly.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, according to described the One steady-state current value and second steady-state current value, the closed-loop path where judging the resistance, the preliminary filling loop are It is no working properly, including：
The first numerical value is obtained, first numerical value is equal to first steady-state current value and second steady-state current value The business of the absolute value of difference and first steady-state current value；
Judge whether first numerical value is more than predetermined threshold value；
If judging, first numerical value is more than predetermined threshold value, the closed-loop path where the resistance, the preliminary filling loop Operation irregularity；
If judging, first numerical value is not more than predetermined threshold value, and the closure where the resistance, the preliminary filling loop is returned Road is working properly.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the default threshold It is worth for the absolute value of measurement accuracy corresponding to the processing component.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, described at least three The time interval of every two adjacent sampling instants in individual sampling instant is equal.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, at least three Sampling instant, the magnitude of voltage at the resistance both ends is obtained respectively, including：
In at least three sampling instant, the voltage signal of the negative pole connection end of the resistance is gathered respectively, and is distinguished Gather the voltage signal of the non-negative pole connection end of the resistance；
According to the voltage signal of the negative pole connection end of the resistance collected respectively at least three sampling instant And the voltage signal of the non-negative pole connection end of the resistance, obtain voltage of the resistance both ends at least three sampling instants Value.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, according to the electricity The magnitude of voltage at resistance both ends changes with time trend, and at the resistance both ends that at least three sampling instants are got respectively Magnitude of voltage, obtain first steady state voltage value at the resistance both ends, including：
According in change procedure of the magnitude of voltage at the resistance both ends by initial voltage value to steady state voltage value, the resistance The magnitude of voltage at both ends changes with time trend, and the resistance two got respectively at least three sampling instant The magnitude of voltage at end, obtain first steady state voltage value at the resistance both ends.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the resistance two The magnitude of voltage at end the first formula corresponding to trend that changes with time is：
Wherein, U (1T) for the resistance both ends in the magnitude of voltage of any sampling instant, Uf1For the stable state at the resistance both ends Magnitude of voltage, Ui1For the initial voltage value at the resistance both ends, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For the resistance, The equivalent resistance of closed-loop path where the preliminary filling loop, CEquivalent 1Returned for the closure where the resistance, the preliminary filling loop The equivalent capacity on road, t are any sampling instant.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, it is described at least Three sampling instants, the magnitude of voltage at preliminary filling loop both ends is obtained respectively, including：
In at least three sampling instant, the voltage signal of the anode connection terminal in the preliminary filling loop is gathered respectively, and The voltage signal of the non-anode connection terminal in the preliminary filling loop is gathered respectively；
According to the voltage of the anode connection terminal in the preliminary filling loop that at least three sampling instant collects respectively Signal, and the voltage signal of the non-anode connection terminal in the preliminary filling loop, preliminary filling loop both ends are obtained at least three The magnitude of voltage of sampling instant.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, according to described pre- The magnitude of voltage for filling loop both ends changes with time trend, and the preliminary filling got at least three sampling instant The magnitude of voltage at loop both ends, second steady state voltage value at preliminary filling loop both ends is obtained, including：
It is described according in change procedure of the magnitude of voltage at preliminary filling loop both ends by initial voltage value to steady state voltage value The magnitude of voltage at preliminary filling loop both ends changes with time trend, and gets at least three sampling instant described pre- The magnitude of voltage at loop both ends is filled, obtains second steady state voltage value at preliminary filling loop both ends.
Aspect as described above and any possible implementation, it is further provided a kind of implementation, the preliminary filling return The magnitude of voltage at road both ends the second formula corresponding to trend that changes with time is：
Wherein, U2(t) for preliminary filling loop both ends in the magnitude of voltage of any sampling instant, Uf2For the preliminary filling loop two The steady state voltage value at end, Ui2For the initial voltage value in the preliminary filling loop, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For institute State the equivalent resistance of the closed-loop path where resistance, the preliminary filling loop, CEquivalent 1For where the resistance, the preliminary filling loop The equivalent capacity of closed-loop path, t are any sampling instant.Eighth aspect, the embodiments of the invention provide a kind of storage of computer Computer-readable recording medium, including：Computer executable instructions, following steps are performed when the computer executable instructions are run：
In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively；
Changed with time trend according to the magnitude of voltage at the resistance both ends, and obtained respectively at least three sampling instants The magnitude of voltage at the resistance both ends got, obtain first steady state voltage value at the resistance both ends.
A technical scheme in above-mentioned technical proposal has the advantages that：
In the embodiment of the present invention, because current detection circuit is integrated in the high tension loop of battery, this just causes electric current to examine Connecting line in slowdown monitoring circuit between each component is shorter, reduces the propagation path of electric current, has saved cost, and to a certain degree On reduce the consume of electric current, then improve to a certain extent in the current detection circuit that current detection circuit is got The accuracy of the current value of resistance, and then the accuracy of the current value of the battery modules got is improved, reduce battery mould The probability of security incident occurs during group power supply.
【Brief description of the drawings】
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this area For those of ordinary skill, without having to pay creative labor, it can also be obtained according to these accompanying drawings other attached Figure.
Fig. 1 is the structural representation of current detection circuit in a kind of cell high voltage loop that the embodiment of the present invention is provided；
Fig. 2 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
Fig. 3 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
Fig. 4 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
Fig. 5 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
Fig. 6 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
Fig. 7 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
Fig. 8 is the structural representation of current detection circuit in another cell high voltage loop that the embodiment of the present invention is provided Figure；
The structural representation of current detection circuit in a kind of specific cell high voltage loop that Fig. 9 embodiment of the present invention is provided Figure；
Figure 10 is a kind of structural representation for detector that the embodiment of the present invention is provided；
Figure 11 is a kind of structural representation for cell apparatus that the embodiment of the present invention is provided；
Figure 12 is a kind of structural representation for high-voltage cage that the embodiment of the present invention is provided；
Figure 13 is a kind of structural representation for delivery vehicle that the embodiment of the present invention is provided；
Figure 14 is the schematic flow sheet that the embodiment of the present invention provides electric current detecting method in a kind of cell high voltage loop；
Figure 15 is the schematic flow sheet that the embodiment of the present invention provides electric current detecting method in another cell high voltage loop；
Figure 16 is the schematic flow sheet that the embodiment of the present invention provides electric current detecting method in another cell high voltage loop.
【Embodiment】
In order to be better understood from technical scheme, the embodiment of the present invention is retouched in detail below in conjunction with the accompanying drawings State.
It will be appreciated that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Base Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its Its embodiment, belongs to the scope of protection of the invention.
The term used in embodiments of the present invention is only merely for the purpose of description specific embodiment, and is not intended to be limiting The present invention." one kind ", " described " and "the" of singulative used in the embodiment of the present invention and appended claims It is also intended to including most forms, unless context clearly shows that other implications.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, represent There may be three kinds of relations, for example, A and/or B, can be represented：Individualism A, while A and B be present, individualism B these three Situation.In addition, " three kinds, it is a kind of relation of "or" to typically represent forward-backward correlation object to character herein.
It will be appreciated that though stable state electricity may be described using term first, second, third, etc. in embodiments of the present invention Pressure, but these steady state voltages should not necessarily be limited by these terms.These terms are only used for steady state voltage being distinguished from each other out.For example, In the case of not departing from range of embodiment of the invention, the first steady state voltage can also be referred to as the second steady state voltage, similarly, the Two steady state voltages can also be referred to as the first steady state voltage.
Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ... When " or " in response to determining " or " in response to detection ".Similarly, depending on linguistic context, phrase " if it is determined that " or " if detection (condition or event of statement) " can be construed to " when it is determined that when " or " in response to determine " or " when the detection (condition of statement Or event) when " or " in response to detecting (condition or event of statement) ".
The invention provides current detection circuit 100 in a kind of cell high voltage loop, electric current is examined in the cell high voltage loop Slowdown monitoring circuit 100 is arranged in the high tension loop of battery, and the structural representation of current detection circuit 100 can in the cell high voltage loop Referring to Fig. 1.
As shown in figure 1, current detection circuit 100 in cell high voltage loop, including：Processing component 101, resistance 102, and Preliminary filling loop 103, resistance 102 include negative pole connection end 1021 and non-negative pole connection end 1022, and preliminary filling loop 103 connects including positive pole Connect end 1031 and non-anode connection terminal 1032.Negative pole connection end 1021 is connected to processing component with non-negative pole connection end 1022 101, anode connection terminal 1031 and non-anode connection terminal 1032 are connected to processing component 101, non-anode connection terminal 1032 with it is non- Negative pole connection end 1022 connects.
Wherein, negative pole connection end 1021, be connected for the negative pole with battery modules, anode connection terminal 1031, for electricity The positive pole connection of pond module.
Above-mentioned processing component 101, for obtaining the current value of battery modules, the magnitude of voltage at the both ends of resistance 102, resistance 102 Current value, the magnitude of voltage at the both ends of preliminary filling loop 103 and the current value in preliminary filling loop 103, in addition, being additionally operable to judge battery height Whether working properly push back current detection circuit 100 in road.
Following is a brief introduction of current detection circuit 100 in cell high voltage loop is how to obtain the voltage at the both ends of resistance 102 Value, the current value of resistance 102, the magnitude of voltage at the both ends of preliminary filling loop 103 and the current value in preliminary filling loop 103, and how to sentence Whether the closed-loop path where resistance break 102, preliminary filling loop 103 is working properly：
For example, obtain current value, the magnitude of voltage at the both ends of resistance 102 and the current value of resistance 102 of battery modules Method it is as follows：
Current detection circuit 100 may connect between the positive pole of battery modules and negative pole in above-mentioned cell high voltage loop, bear Connecting line between pole connection end 1021 and processing component 101, can be described as the first gathering line 104, non-negative pole connection end 1022 with Connecting line between processing component 101, can be described as the second gathering line 105, processing component 101 can by the first gathering line 104 with And second gathering line 105, the voltage signal of negative pole connection end 1021 and the voltage letter of non-negative pole connection end 1022 are gathered respectively Number, processing component 101 obtains according to the voltage signal of negative pole connection end 1021 and the voltage signal of non-negative pole connection end 1022 The magnitude of voltage at the both ends of resistance 102 is got, then according to the resistance value of the magnitude of voltage at the both ends of resistance 102 and resistance 102, is obtained The current value of resistance 102.
It should be noted that because the annexation of battery modules and resistance 102 be series relationship, in theory for, go here and there Join in circuit that current value is equal everywhere, therefore, current value that can be using the current value of the resistance 102 as battery modules.
For example, obtain the method for the magnitude of voltage at the both ends of preliminary filling loop 103 and the current value in preliminary filling loop 103 such as Under：
Current detection circuit 100 is connected between the positive pole of battery modules and negative pole in above-mentioned cell high voltage loop, positive pole Connecting line between connection end 1031 and processing component 101, it can be described as the 3rd gathering line 106, non-anode connection terminal 1032 and place Manage the connecting line between component 101, can be described as the 4th gathering line 107, processing component 101 can by the 3rd gathering line 106 and 4th gathering line 107, the voltage signal of anode connection terminal 1031 and the voltage signal of non-anode connection terminal 1032 are gathered respectively, Processing component 101 obtains pre- according to the voltage signal of anode connection terminal 1031 and the voltage signal of non-anode connection terminal 1032 The magnitude of voltage at the both ends of loop 103 is filled, then according to the magnitude of voltage at the both ends of preliminary filling loop 103 and the resistance value in preliminary filling loop 103, Obtain the current value in preliminary filling loop 103.
For example, judge that whether working properly resistance 102, the closed-loop path at the place of preliminary filling loop 103 method be as follows：
The difference of the current value of resistance 102 and the current value in preliminary filling loop 103 is judged whether in a certain preset range, if Judged result is yes, then judges that the closed-loop path where resistance, preliminary filling loop is working properly, otherwise, it is determined that resistance 102, preliminary filling Closed-loop path operation irregularity where loop 103.
Because actually should in, series circuit may be interfered, and cause in series circuit that current value is not phase everywhere Deng, if the series circuit is working properly, any two in the series circuit at current value difference within the specific limits, therefore, Whether the difference by judging the current value of resistance 102 and the current value in preliminary filling loop 103 can be sentenced in a certain preset range Whether the closed-loop path broken where resistance 102, preliminary filling loop 103 is working properly.
Optionally, referring to Fig. 1, the processing component 101 in Fig. 1, it is used for：
In at least three sampling instants, the magnitude of voltage at the both ends of resistance 102 is obtained respectively；
Changed with time trend according to the magnitude of voltage at the both ends of resistance 102, and at least three sampling instants point The magnitude of voltage at the both ends of the resistance 102 not got, obtain first steady state voltage value at the both ends of resistance 102.
Optionally, referring to Fig. 1, processing component 101 in Fig. 1, it is additionally operable to：
In at least three sampling instant, the magnitude of voltage at the both ends of preliminary filling loop 103 is obtained respectively；
Changed with time trend according to the magnitude of voltage at the both ends of preliminary filling loop 103, and adopted described at least three The magnitude of voltage at the both ends of preliminary filling loop 103 that the sample moment gets, obtain second stable state at the both ends of preliminary filling loop 103 Magnitude of voltage.
Optionally, referring to Fig. 1, processing component 101 in Fig. 1, it is additionally operable to：
It is worth according to the first resistor 102 of first steady state voltage value and the resistance 102, obtains the resistance 102 The first steady-state current, and be worth according to the second resistance 102 of second steady state voltage value and the preliminary filling loop 103, obtained Take second steady-state current value in the preliminary filling loop 103；
According to first steady-state current value and second steady-state current value, whether the current detection circuit is judged It is working properly.
It should be noted that in the embodiment of the present invention, processing component 101 is not limited and obtains the first steady state voltage value and the The sequencing of two steady state voltage values.
Wherein, if processing component 101 is synchronous to obtain the first steady state voltage value and the second steady state voltage value, can so improve The efficiency of the first steady state voltage value and the second steady state voltage value is obtained, improves current detection circuit 100 in cell high voltage loop Detection efficiency.
Optionally, current detection circuit 100 in also offer another kind cell high voltage loop of the invention, cell high voltage loop The structural representation of middle current detection circuit 100 can be found in Fig. 2.
As shown in Fig. 2 on the basis of the structure shown in Fig. 1, preliminary filling loop 103 includes switch 1033 and precharge Resistance 1034, switch 1033, preliminary filling resistance 1034 are connected between anode connection terminal 1031 and non-anode connection terminal 1032, are switched 1033 are connected with anode connection terminal 1031, and preliminary filling resistance 1034 is connected with non-anode connection terminal 1032.
Wherein, above-mentioned switch 1033 can be transistor and/or relay, for example transistor can be metal-oxide-half Conductor field-effect transistor or triode etc..Metal-oxide-semiconductor field (Metal-Oxide- Semiconductor, MOS) transistor small volume, no problem of aging, be quick on the draw.
Above-mentioned preliminary filling resistance 1034 may include at least one resistance, and/or, at least one electric resistance array.Preliminary filling resistance 1034 are used for partial pressure current limliting, cause safe thing occur because electric current is excessive for reducing to a certain extent in current detection circuit Therefore probability of happening.
Optionally, the embodiment of the present invention also provides current detection circuit 100 in another cell high voltage loop, battery high pressure The structural representation of current detection circuit 100 can be found in Fig. 3 in loop.
As shown in figure 3, on the basis of the structure shown in Fig. 2, preliminary filling loop 103 also includes counnter attack connected components 1035, prevents Reversal connection component 1035 is connected between anode connection terminal 1031 and switch 1033.The counnter attack connected components 1035 allow electric current by positive pole The flow direction switch of connection end 1,031 1033, does not allow electric current to flow to anode connection terminal 1031, therefore counnter attack connected components by switch 1033 1035 can be used for the security of the closed-loop path at raising resistance 102 and the place of preliminary filling loop 103.
For example, counnter attack connected components 1035 can be diode, the negative electrode of the diode is connected with switch 1033, the diode Anode is connected with anode connection terminal 1031.
Optionally, current detection circuit 100 in also offer another kind cell high voltage loop of the invention, cell high voltage loop The structural representation of middle current detection circuit 100 can be found in Fig. 4.
During concrete application, it is contemplated that processing component 101 generally requires connection power supply, in order to which power supply is the processing Component 101 is powered, processing component 101 could normal work, in addition, processing component 101 is generally required and other controllers or set Standby to be communicated, still, processing component 101 is arranged in high tension loop, and cell high voltage loop as shown in FIG. 1 to 3 Middle current detection circuit 100 may be contained within high tension loop, and be that the power supply that processing component 101 is powered can typically be arranged at low pressure In loop, and the controller or equipment that are communicated with processing component 101 are also disposed in low tension loop, and hence it is also possible to Isolation strip is set in current detection circuit 100 in the cell high voltage loop that the embodiment of the present invention is provided, to avoid height from pushing back Road produces signal interference to low tension loop, influences the normal work of low tension loop.
At this point it is possible to reference to figure 4, current detecting in its another cell high voltage loop provided by the embodiment of the present invention The structural representation of circuit 100, as shown in figure 4, on the basis of the structure shown in Fig. 1, current detecting in cell high voltage loop Circuit 100 also includes：
Isolation strip 108, it is arranged at the fringe region that processing component 101 is connected with low tension loop；
Power Supply Assembly 109, is arranged at the both sides of isolation strip 108, and first end and the processing component 101 of Power Supply Assembly 109 connect Connect, the second end of Power Supply Assembly 109 and the power supply unit 110 of peripheral hardware connect；
Communication component 111, is arranged at the both sides of isolation strip 108, and first end and the processing component 101 of communication component 111 connect Connect, the second end of communication component 111 and the general control system 112 of peripheral hardware connect.
Optionally, current detection circuit 100 in also offer another kind cell high voltage loop of the invention, cell high voltage loop The structural representation of middle current detection circuit 100 can be found in Fig. 5.
As shown in figure 5, on the basis of the structure shown in Fig. 1, current detection circuit 100 is gone back in above-mentioned cell high voltage loop Including：
First partial pressure component 113, anode connection terminal 1031 are connected by the first partial pressure component 113 with processing component 101, The first end of first partial pressure component 113 is connected with anode connection terminal 1031, the second end of the first partial pressure component 113 and processing component 101 connections, the 3rd end ground connection of the first partial pressure component 113.
Second partial pressure component 114, negative pole connection end 1021 are connected by the second partial pressure component 114 with processing component 101, The first end of second partial pressure component 114 is connected with non-anode connection terminal 1032, the second end of the second partial pressure component 114 and treatment group Part 101 connects, the 3rd end ground connection of the second partial pressure component 114.
Wherein, the first partial pressure component 113 may include：At least one resistance；And/or at least one electric resistance array.Second point Pressure component 114 may include：At least one resistance；And/or at least one electric resistance array.
Processing component 101 according to partial pressure method, can obtain the voltage of anode connection terminal 1031 by the first partial pressure component 113 Signal, in addition, processing component 101 can obtain non-anode connection terminal 1032 according to partial pressure method by the second partial pressure component 114 Voltage signal.
Optionally, current detection circuit 100 in also offer another kind cell high voltage loop of the invention, cell high voltage loop The structural representation of middle current detection circuit 100 can be found in Fig. 6.
As shown in fig. 6, on the basis of the structure shown in Fig. 1, current detection circuit 100 is gone back in above-mentioned cell high voltage loop Including：
Thermistor 115, is arranged at the position contacted with the resistance 102, the first end of the thermistor 115 with The processing component 101 connects, the second end ground connection of the thermistor 115.
Wherein, will can be adopted by the annexation between thermistor 115 and processing component 101, thermistor 115 The temperature signal of the resistance 102 collected is transferred to processing component 101, by processing component 101 further according to these temperature signals Safe protection treatment is performed, avoids influenceing the security of current detection circuit 100 because the temperature of resistance 102 is too high.
Optionally, current detection circuit 100 in also offer another kind cell high voltage loop of the invention, cell high voltage loop The structural representation of middle current detection circuit 100 can be found in Fig. 7.
As shown in fig. 7, on the basis of the structure shown in Fig. 1, current detection circuit 100 is gone back in above-mentioned cell high voltage loop Including：
At least one load 116, non-anode connection terminal 1032 pass through at least one load 116 and non-negative pole connection end 1022 Connection.Load 116 can be motor or electric capacity etc..
Optionally, current detection circuit 100 in also offer another kind cell high voltage loop of the invention, cell high voltage loop The structural representation of middle current detection circuit 100 can be found in Fig. 8.
As shown in figure 8, on the basis of the structure shown in Fig. 2, switch 1033 is connected with processing component 101.So handle Component 101 can controlling switch 1033 end or turn on, so as to control the cut-off of current detection circuit 100 in cell high voltage loop With conducting.
It should be noted that in the embodiment of the present invention, also settable at least two processing components 101, different treatment groups Part 101 connects (being not drawn into schematic diagram) from different connection ends, and different processing components 101 gathers different connection ends respectively Voltage signal, and then get resistance 102 and the voltage at the both ends of preliminary filling loop 103.
In order to make reader be easier to understand current detection circuit 100 in cell high voltage loop provided by the invention, arrange below Current detection circuit 120 in a kind of specific cell high voltage loop is enumerated, is briefly described for reader, is referring to Fig. 9, Fig. 9 The structural representation of current detection circuit 120 in the specific cell high voltage loop, in Fig. 9, the specific cell high voltage loop Middle current detection circuit 120 includes micro-control unit 121, current divider 122, preliminary filling loop 103, second resistance 124,3rd resistor 125th, the 4th resistance 126, the 5th resistance 127 and thermistor 115.Wherein, current divider includes the first connection end 1221 and the Two connection ends 1222, built-in first resistor 1223 in current divider 122, the first resistor 1223 include the He of the 3rd connection end 1224 4th connection end 1225, preliminary filling loop 123 includes the 5th connection end 1231 and the 6th connection end 1232, in addition, preliminary filling loop 103 also include diode 1233, MOS pipes 1234 and electric resistance array 1235.
Wherein, the 3rd connection end 1224 and the 4th connection end 1225 are connected to micro-control unit 121, second connection end 1222 are connected with the 6th connection end 1232, and diode 1233, metal-oxide-semiconductor 1234 and electric resistance array 1235 are sequentially connected in series to be connected the 5th Between connecing the connection end 1232 of end 1231 and the 6th, the anode of diode 1233 is connected with the 5th connection end 1231, diode 1233 negative electrode is connected with the first end of MOS pipes 1234, and the second end of metal-oxide-semiconductor 1234 connects with the first end of electric resistance array 1235 Connect, the second end of electric resistance array 1235 is connected with the 6th connection end 1232, control terminal and the micro-control unit 121 of metal-oxide-semiconductor 1234 Connection.5th connection end 1231 is connected with the first end of second resistance 124, and the second end of second resistance 124 is electric with the 3rd respectively The first end and micro-control unit 121 of resistance 125 connect, the second end ground connection of 3rd resistor 125.6th connection end 1232 and The first end connection of four resistance 126, the second end of the 4th resistance 126 first end and microcontroller with the 5th resistance 127 respectively Unit 121 connects, the second end ground connection of the 4th resistance 126.Thermistor 115 is arranged at the outside of current divider 122, and with first The position that resistance 1223 contacts, the first end of thermistor 115 are connected with micro-control unit 121, and the second of thermistor 115 End ground connection.
Micro-control unit 121 carries equivalent to processing component 101 mentioned hereinabove, first resistor 1223 equivalent to above And resistance 102, diode 1233 is equivalent to counnter attack connected components 1035 mentioned hereinabove, and metal-oxide-semiconductor 1234 is equivalent to above The switch 1033 referred to, electric resistance array 1235 is equivalent to preliminary filling resistance 1034 mentioned hereinabove.Second resistance 124 and the 3rd Resistance 125 is equivalent to the first partial pressure component 113, and the 4th resistance 126 and the 5th resistance 127 are equivalent to the second partial pressure component 114。
In the embodiment of the present invention, because current detection circuit is integrated in the high tension loop of battery, this just causes electric current to examine Connecting line in slowdown monitoring circuit between each component is shorter, reduces the propagation path of electric current, has saved cost, and to a certain degree On reduce the consume of electric current, then improve to a certain extent the resistance that current detection circuit is got current value and The accuracy of the current value in preliminary filling loop, the accuracy of the electric current of the battery modules got is improved, reduces battery modules The probability of security incident occurs during power supply, the security of battery modules power supply is improved, in addition, also improving to a certain extent The accuracy of closed-loop path where judging resistance and preliminary filling loop judged result whether working properly.
The embodiment of the present invention also provides a kind of detector 200, and the structural representation of the detector 200 can be found in Figure 10, such as Shown in Figure 10, the detector 200 includes current detection circuit 100 in cell high voltage loop shown in any figure in Fig. 1~8.
The embodiment of the present invention also provides a kind of cell apparatus 400, and the structural representation of the cell apparatus 400 can be found in figure 11, as shown in figure 11, the cell apparatus 400 includes：
Battery modules 401, the battery modules 401 include positive pole and negative pole；
Current detection circuit 100 in the cell high voltage loop shown in any figure in Fig. 1~8, the cell high voltage loop Middle current detection circuit 100 is connected between positive pole and negative pole, and anode connection terminal 1031 is connected with positive pole, negative pole connection end 1021 It is connected with negative pole.
The embodiment of the present invention also provides a kind of high-voltage cage 500, and the structural representation of the high-voltage cage 500 can be found in Figure 12, such as Shown in Figure 12, the high-voltage cage 500 includes current detection circuit in the cell high voltage loop shown in any figure in Fig. 1~8 100。
The embodiment of the present invention also provides a kind of delivery vehicle 600, and the structural representation of the delivery vehicle 600 can be found in figure 13, as shown in figure 13, the delivery vehicle 600 includes current detecting in the cell high voltage loop shown in any figure in Fig. 1~8 Circuit 100.
The embodiment of the present invention gives electric current detecting method in a kind of cell high voltage loop, and this method is above-mentioned applied to including In cell high voltage loop in current detection circuit 100, processing component 101 is implemented in, in embodiments of the present invention, the battery high pressure Current detection circuit 100 is connected between the positive pole of battery modules and negative pole in loop, the negative pole connection end 1021 of resistance 102 with Negative pole is connected, and the anode connection terminal 1031 in preliminary filling loop is connected with positive pole, and the structural representation of the circuit can be found in Figure 11, separately Outside, Figure 14 is refer to, the schematic flow sheet of its method provided by the embodiment of the present invention, as shown in figure 14, this method includes Following steps：
Step 701, at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively.
Step 702, changed with time trend according to the magnitude of voltage at the resistance both ends, and when at least three sample The magnitude of voltage at the resistance both ends got respectively is carved, obtains first steady state voltage value at the resistance both ends.
Above-mentioned at least three sampling instant, can be any sampling instant.In a certain implement scene, above-mentioned at least three The time interval of every two adjacent sampling instants in sampling instant can be with equal, and the time interval can use any number, no Cross to improve the efficiency for the magnitude of voltage for obtaining resistance both ends, the time interval is the smaller the better.
In the embodiment of the present invention, following methods can be used, in the electricity of at least three sampling instants, respectively acquisition resistance both ends Pressure value：
In at least three sampling instants, the voltage signal of the negative pole connection end of resistance is gathered respectively, and gathers resistance respectively Non- negative pole connection end voltage signal, according to the negative pole connection end of the resistance collected respectively at least three sampling instants The voltage signal of the non-negative pole connection end of voltage signal and resistance, obtain voltage of the resistance both ends at least three sampling instants Value.
Specifically, for any sampling instant in above-mentioned at least three sampling instant, collected according to the sampling instant Resistance negative pole connection end voltage signal and resistance non-negative pole connection end voltage signal, obtain in the sampling instant The magnitude of voltage at resistance both ends.
Wherein, the voltage signal of the negative pole connection end of the resistance collected, it is negative pole connection end and the battery modules of resistance Negative pole between magnitude of voltage (first voltage value can be claimed hereinafter), the voltage signal of the non-negative pole connection end of the resistance collected, Non- negative pole connection end for resistance and the magnitude of voltage (second voltage value can be claimed hereinafter) between the negative pole of battery modules.It is directed to Any sampling instant in above-mentioned at least three sampling instant, the second voltage value of the sampling instant is subtracted into the sampling instant The difference that first voltage is worth to, it is the magnitude of voltage at the sampling instant resistance both ends.
Illustrate finish the magnitude of voltage for how obtaining resistance both ends after, illustrate how obtain the first steady state voltage value it Before, in order to allow reader to be easier to understand electric current detecting method in cell high voltage loop provided in an embodiment of the present invention, below first letter Single magnitude of voltage for introducing lower resistance both ends why time to time change, and what is the first steady state voltage value：
In closed-loop path where resistance, preliminary filling loop and battery modules, it is understood that there may be parasitic capacitance, in resistance, in advance After closed-loop path where filling loop and battery modules turns on, battery modules preferentially give parasitic capacitance to charge, and are giving parasitic electricity During capacity charge, the magnitude of voltage of magnitude of voltage, preliminary filling loop both ends in parasitic capacitance and the magnitude of voltage at resistance both ends with Time change, etc. battery modules to parasitic capacitance it is fully charged after, the magnitude of voltage of voltage, preliminary filling loop both ends in parasitic capacitance with And the magnitude of voltage at resistance both ends just will not change over time, at this moment the magnitude of voltage at resistance both ends is just the magnitude of voltage of stable state, i.e., the One steady state voltage value.
Introduce finish resistance both ends magnitude of voltage why time to time change, and what be the first steady state voltage value it Afterwards, the first method and second of the first steady state voltage value method of acquisition for obtaining the first steady state voltage value is described below：
The first method for obtaining the first steady state voltage value is described below：
In embodiments of the present invention, change that can be according to the magnitude of voltage at resistance both ends by initial voltage value to steady state voltage value During, the magnitude of voltage at resistance both ends changes with time trend, and the electricity got respectively at least three sampling instants The magnitude of voltage at both ends is hindered, obtains first steady state voltage value at resistance both ends.
Specifically, the magnitude of voltage at above-mentioned resistance both ends changes with time, the first formula corresponding to trend can be：
Wherein, U (1T) for the resistance both ends in the magnitude of voltage of any sampling instant, Uf1For the stable state at the resistance both ends Magnitude of voltage, Ui1For the initial voltage value at the resistance both ends, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For the resistance, The equivalent resistance of closed-loop path where the preliminary filling loop, CEquivalent 1Returned for the closure where the resistance, the preliminary filling loop The equivalent capacity on road, t are any sampling instant.
By at least three sampling instants, and the magnitude of voltage at resistance both ends that gets of at least three sampling instants generation respectively Enter in the first formula, can get at least three ternary linear functions, in each ternary linear function, Uf1、Ui1And τ1For Unknown number, optional wherein three ternary linear functions at least three ternary linear functions, form a ternary linear function Group, by solving this ternary linear function group, U can be gotf1, that is, get the first steady state voltage value；Or at least Optional wherein three sampling instants in three sampling instants, by select three sampling instants and these three sampling instants electricity The magnitude of voltage for hindering both ends is substituted into the first formula, gets three ternary linear functions, these three ternary linear functions composition one Individual three first linear function groups, solve this ternary linear function group, can not obtain U in advancef1、Ui1And τ1In the case of obtain Get Uf1, that is, get the first steady state voltage value.
For example, arbitrarily choosing three sampling instants at least three sampling instants, these three sampling instants are respectively t1 Moment, t2Moment and t3Moment, t1The magnitude of voltage at the resistance both ends that the moment gets is first voltage value U1, t2Moment gets The magnitude of voltage at resistance both ends be second voltage value U2, t3The magnitude of voltage at the resistance both ends that the moment gets is third voltage value U3, By t1、t2、t3、U1、U2And U3Substitute into the first formula, obtain following formula (1), formula (2) and formula (3), i.e. three ternarys once Equation, these three ternary linear functions form a ternary linear function group：
By solving above-mentioned ternary linear function group, U can be gotf1, that is, get the first steady state voltage value.
In a kind of implement scene, if in the ternary linear function group got, it is every adjacent in three sampling instants Time interval between two sampling instants is equal, uses the example above, i.e. t3-t2=t2-t1, then following methods can be used to obtain Uf1：
Formula (1), formula (2) and formula (3) are subjected to formula deformation, respectively obtain formula (4), formula (5) and formula (6)：
Formula (4) divided by formula (5) are obtained into formula (7), formula (5) divided by formula (6) obtain formula (8)：
Due to t3-t2=t2-t1, then formula (9) can obtain according to formula (7) and formula (8)：
Then according to formula (9), obtain：
The method of the steady state voltage value of second of acquisition first is described below, the schematic flow sheet of this method as shown in Figure 15, This method comprises the steps：
Step 801, the steady state voltage value obtained between the negative pole connection end of resistance and the negative pole of battery modules (can claim hereinafter Three-stable state magnitude of voltage).
Specifically, it can be obtained at least three sampling instants between the negative pole connection end of resistance and battery modules negative pole Magnitude of voltage, according to the voltage between the negative pole connection end of the resistance got at least three sampling instants and battery modules negative pole Value, and magnitude of voltage between the negative pole connection end of resistance and battery modules negative pole change with time trend, and it is steady to obtain the 3rd State magnitude of voltage.
Wherein, the trend that changes with time of the magnitude of voltage between the negative pole connection end of resistance and battery modules negative pole is corresponding 3rd formula can be：
Wherein, U3(t) it is the electricity between the negative pole connection end of resistance described in any sampling instant and battery modules negative pole Pressure value, Uf3The steady state voltage value between negative pole connection end and battery modules negative pole for the resistance, Ui3For the negative of the resistance Initial voltage value between pole connection end and battery modules negative pole, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For the electricity The equivalent resistance of closed-loop path where resistance, the preliminary filling loop, CEquivalent 1For the closure where the resistance, the preliminary filling loop The equivalent capacity in loop, t are any sampling instant.
By at least three sampling instants, and the negative pole connection end of resistance that gets of at least three sampling instants and battery Magnitude of voltage between module negative pole substitutes into the first formula respectively, can get at least three ternary linear functions, Mei Gesan In first linear function, Uf3、Ui3And τ1For unknown number, optional wherein three ternarys are once at least three ternary linear functions Equation, a ternary linear function group is formed, by solving this ternary linear function group, U can be gotf3, that is, get Three-stable state magnitude of voltage；Or optional wherein three sampling instants at least three sampling instants, by select three samplings Magnitude of voltage between the negative pole connection end and battery modules negative pole of moment and these three sampling instant resistance substitutes into the first formula In, get three ternary linear functions, these three ternary linear functions form three first linear function groups, solve this three First linear function group, U can not be being obtained in advancef3、Ui3And τ1In the case of, get Uf3, that is, get three-stable state electricity Pressure value.
For example, arbitrarily choosing three sampling instants at least three sampling instants, these three sampling instants are respectively t4 Moment, t5Moment and t6Moment, t4The magnitude of voltage at the resistance both ends that the moment gets is the 4th magnitude of voltage U4, t5Moment gets The magnitude of voltage at resistance both ends be the 5th magnitude of voltage U5, t6The magnitude of voltage at the resistance both ends that the moment gets is the 6th magnitude of voltage U6, By t4、t5、t6、U4、U5And U6Substitute into the 3rd formula, obtain following formula (10), formula (11) and formula (12), i.e. three ternarys one Equation of n th order n, these three ternary linear functions form a ternary linear function group：
By solving above-mentioned ternary linear function group, U can be gotf3, that is, get three-stable state magnitude of voltage.
In a kind of implement scene, if in the ternary linear function group got, it is every adjacent in three sampling instants Time interval between sampling instant is equal, uses the example above, i.e. t6-t5=t5-t4, then following methods can be used to obtain Uf3：
Formula (10), formula (11) and formula (12) are subjected to formula deformation, respectively obtain formula (13), formula (14) and formula (15)：
Formula (13) divided by formula (14) are obtained into formula (16), formula (14) divided by formula (15) obtain formula (17)：
Due to t6-t5=t5-t4, then formula (18) can obtain according to formula (16) and formula (17)：
Then according to formula (18), obtain：
Step 802, steady state voltage value between the non-negative pole connection end of resistance and the negative pole of battery modules is obtained (hereinafter The 4th steady state voltage value can be claimed).
Specifically, it can be obtained at least three sampling instants between the non-negative pole connection end of resistance and battery modules negative pole Magnitude of voltage, according between the non-negative pole connection end of the resistance got at least three sampling instants and battery modules negative pole Magnitude of voltage between magnitude of voltage, and the non-negative pole connection end of resistance and battery modules negative pole changes with time trend, obtains 4th steady state voltage value.
Wherein, the trend that changes with time of the magnitude of voltage between the non-negative pole connection end of resistance and battery modules negative pole is corresponding The 3rd formula can be：
Wherein, U4(t) it is between the non-negative pole connection end of resistance described in any sampling instant and battery modules negative pole Magnitude of voltage, Uf4For the steady state voltage value between the non-negative pole connection end of the resistance and battery modules negative pole, Ui4For the resistance Non- negative pole connection end and battery modules negative pole between initial voltage value, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For institute State the equivalent resistance of the closed-loop path where resistance, the preliminary filling loop, CEquivalent 1For where the resistance, the preliminary filling loop The equivalent capacity of closed-loop path, t are any sampling instant.
By at least three sampling instants, and the non-negative pole connection end of resistance that gets of at least three sampling instants and electricity Magnitude of voltage between the module negative pole of pond substitutes into the first formula respectively, can get at least three ternary linear functions, each In ternary linear function, Uf4、Ui4And τ1For unknown number, optional wherein three ternarys one at least three ternary linear functions Equation of n th order n, a ternary linear function group is formed, by solving this ternary linear function group, U can be gotf4, that is, get 4th steady state voltage value；Or optional wherein three sampling instants at least three sampling instants, select three are adopted Magnitude of voltage between sample moment and the non-negative pole connection end of these three sampling instant resistance and battery modules negative pole substitutes into first In formula, three ternary linear functions are got, these three ternary linear functions form three first linear function groups, solve this Individual ternary linear function group, U can not be being obtained in advancef4、Ui4And τ1In the case of, get Uf4, that is, it is steady to get the 4th State magnitude of voltage.
For example, arbitrarily choosing three sampling instants at least three sampling instants, these three sampling instants are respectively t7 Moment, t8Moment and t9Moment, t7The magnitude of voltage at the resistance both ends that the moment gets is the 7th magnitude of voltage U7, t8Moment gets The magnitude of voltage at resistance both ends be the 8th magnitude of voltage U8, t9The magnitude of voltage at the resistance both ends that the moment gets is the 9th magnitude of voltage U9, By t7、t8、t9、U7、U8And U9Substitute into the 3rd formula, obtain following formula (19), formula (20) and formula (21), i.e. three ternarys one Equation of n th order n, these three ternary linear functions form a ternary linear function group：
By solving above-mentioned ternary linear function group, U can be gotf4Get the 4th steady state voltage value.
In a kind of implement scene, if in the ternary linear function group got, it is every adjacent in three sampling instants Time interval between sampling instant is equal, uses the example above, i.e. t9-t8=t8-t7, then following methods can be used to obtain Uf4：
Formula (19), formula (20) and formula (21) are subjected to formula deformation, respectively obtain formula (22), formula (23) and formula (24)：
Formula (22) divided by formula (23) are obtained into formula (25), formula (23) divided by formula (24) obtain formula (26)：
Due to t9-t8=t8-t7, then formula (27) can obtain according to formula (25) and formula (26)：
Then according to formula (27), obtain：
Step 803, according to three-stable state magnitude of voltage and the 4th steady state voltage value, the first steady state voltage value is obtained.
4th steady state voltage value is subtracted into three-stable state magnitude of voltage, obtained difference is just the first steady state voltage value,
In the prior art, the voltage at resistance both ends in the current detection circuit that will typically be got in any sampling instant Value, as the steady state voltage value at resistance both ends, but due to there may be parasitic capacitance, current detecting electricity in current detection circuit After the conducting of road, power supply is preferably that parasitic capacitance charges, in charging process, the magnitude of voltage at each component both ends in current detection circuit May time to time change, after parasitic capacitance is fully charged, current detection circuit is in stable state, at this moment current detecting electricity The magnitude of voltage at each component both ends just no longer changes in road, and the magnitude of voltage at each component both ends at this moment got is just stable state electricity Pressure value, but in the prior art, the magnitude of voltage at the resistance both ends that any sampling instant is got may be steady state voltage value, also may be used Can not be steady state voltage value, that is, steady state voltage value is also in the prior art and during the magnitude of voltage at the uncertain resistance both ends obtained It is non-steady state voltage value, this just causes the accuracy of the steady state voltage value at the resistance both ends got in the prior art relatively low.Its In, the reason for parasitic capacitance is there may be in current detection circuit is：In current detection circuit and it is not provided with electric capacity, but due to It may be interfered between the electric signal in each component or wire in current detection circuit, or current detection circuit In electric signal and other circuits in electric signal between may interfere, produce mutual tolerance, that is, produce parasitic capacitance.
In the embodiment of the present invention, changed with time trend according to the magnitude of voltage at resistance both ends, and adopted at least three The magnitude of voltage at the resistance both ends that the sample moment gets respectively, to obtain first steady state voltage value at resistance both ends, wherein, no matter The magnitude of voltage at the resistance both ends that at least three sampling instants are got is the steadying resistance value at resistance both ends, according to it is above-mentioned extremely The magnitude of voltage at the resistance both ends that few three sampling instants are got, and above-mentioned variation tendency, can get resistance both ends Steady state voltage value, i.e. the first steady state voltage value, then, just improve the resistance both ends got steady state voltage value it is accurate Property.
After first steady state voltage value at resistance both ends is got, it can also be obtained respectively at least three sampling instants The magnitude of voltage at preliminary filling loop both ends, changed with time trend according to the magnitude of voltage at preliminary filling loop both ends, and at least three The magnitude of voltage at the preliminary filling loop both ends that sampling instant is got, obtain second steady state voltage value at preliminary filling loop both ends.Wherein, obtain At least three sampling instants in preliminary filling loop are taken, can be identical with obtaining at least three sampling instants of magnitude of voltage at resistance both ends Sampling instant.
Wherein, the magnitude of voltage at preliminary filling loop both ends can be obtained by the following method：
In at least three sampling instants, the voltage signal of the anode connection terminal in preliminary filling loop is gathered respectively, and is gathered respectively The voltage signal of the non-anode connection terminal in preliminary filling loop, according to the preliminary filling loop collected respectively at least three sampling instants The voltage signal of anode connection terminal, and the voltage signal of the non-anode connection terminal in preliminary filling loop, obtain preliminary filling loop both ends and exist The magnitude of voltage of at least three sampling instants.
In addition, also preliminary filling loop both ends can be obtained extremely according to the first partial pressure component, the second partial pressure component and partial pressure method The magnitude of voltage of few three sampling instants, is not discussed here.
Preliminary filling loop both ends are being got after the magnitude of voltage of at least three sampling instants, can be according to preliminary filling loop both ends In change procedure of the magnitude of voltage by initial voltage value to steady state voltage value, the magnitude of voltage at preliminary filling loop both ends changes with time Gesture, and the magnitude of voltage at the preliminary filling loop both ends that at least three sampling instants are got, obtain the second of preliminary filling loop both ends Steady state voltage value.
Wherein, the magnitude of voltage at preliminary filling loop both ends the second formula corresponding to trend that changes with time can be：
Wherein, U2(t) for preliminary filling loop both ends in the magnitude of voltage of any sampling instant, Uf2For the stable state at preliminary filling loop both ends Magnitude of voltage, Ui2For the initial voltage value in the preliminary filling loop, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For the resistance, The equivalent resistance of closed-loop path where the preliminary filling loop, CEquivalent 1Returned for the closure where the resistance, the preliminary filling loop The equivalent capacity on road, t are any sampling instant.
It can use and be similar to method acquisition the second stable state electricity that the first being provided above obtains the first steady state voltage value Pressure value, for example, arbitrarily choosing t at least three sampling instants11Moment, t12Moment and t13Three sampling instants of moment, t11 The magnitude of voltage at the preliminary filling loop both ends that the moment gets is the 11st magnitude of voltage U11, t12The preliminary filling loop both ends that moment gets Magnitude of voltage be the 12nd magnitude of voltage U12, t13The magnitude of voltage at the preliminary filling loop both ends that the moment gets is the 13rd magnitude of voltage U13, By t11、t12And t13、U11、U12And U13Substitute into the second formula, obtain a ternary linear function group, solve the ternary once Equation group, the second steady state voltage value got
In addition, the method for being similar to second of the first steady state voltage value of acquisition being provided above can be also used to obtain second Steady state voltage value, for example, below by taking current detection circuit in the specific cell high voltage loop shown in Fig. 9 as an example, describe in detail How second steady state voltage value is obtained：
First, processing component 101 is in t14、t15And t16Three sampling instants obtain the both ends of 3rd resistor 125 respectively Magnitude of voltage U14、U15And U16, changed with time the 5th formula corresponding to trend according to the magnitude of voltage at the both ends of 3rd resistor 125Obtain the 5th steady state voltage value at the both ends of 3rd resistor 125
Wherein, U5(t) in the magnitude of voltage at any both ends of sampling instant 3rd resistor 125, Uf5For the both ends of 3rd resistor 125 Steady state voltage value, Ui5For the initial voltage value at the both ends of 3rd resistor 125, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For The equivalent resistance of second resistance 124 and the place circuit of 3rd resistor 125, CEquivalent 1For second resistance 124 and 3rd resistor 125 The equivalent capacity of place circuit, t are any sampling instant.
Secondly, after the 5th steady state voltage value is got, processing component 101 obtains anode connection terminal according to partial pressure method The 6th steady state voltage value between 1031 and negative pole connection end 1021
Wherein, R2For the resistance of second resistance 124, R3For the resistance of 3rd resistor 125.
3rd, processing component 101 is in t17、t18And t19Three sampling instants obtain the both ends of the 5th resistance 127 respectively Magnitude of voltage U17、U18And U19, changed with time the 6th formula corresponding to trend according to the magnitude of voltage at the both ends of the 5th resistance 127Obtain the 7th steady state voltage value at the both ends of the 5th resistance 127
Wherein, U6(t) in the magnitude of voltage at any both ends of the 5th resistance of sampling instant 127, Uf6For the both ends of the 5th resistance 127 Steady state voltage value, Ui6For the initial voltage value at the both ends of the 5th resistance 127, τ1For time constant, τ1=REquivalent 1CEquivalent 1, REquivalent 1For The equivalent resistance in preliminary filling loop 103, the 4th resistance 126 and the place circuit of the 5th resistance 127, CEquivalent 1For preliminary filling loop 103, The equivalent capacity of 4th resistance 126 and the place circuit of the 5th resistance 127, t are any sampling instant.
4th, after the 5th steady state voltage value is got, processing component 101 can obtain non-positive pole connection according to partial pressure method The 8th steady state voltage value between end 1032 and negative pole connection end 1021
Wherein, R4For the resistance of the 4th resistance 126, R5For the resistance of the 5th resistance 127.
5th, the 6th steady state voltage value subtracts the difference that the 8th steady state voltage is worth to, and is just the second steady state voltage value, i.e.,
, can after the second steady state voltage value of first steady state voltage value at resistance both ends and preliminary filling loop both ends is got According to the first steady state voltage value and the first resistor value of resistance, the first steady-state current of resistance is obtained, and according to the second stable state Magnitude of voltage and the second resistance value in preliminary filling loop, second steady-state current value in preliminary filling loop is obtained, according to the first steady-state current Whether value and the second steady-state current value, the closed-loop path where judging resistance, preliminary filling loop are working properly.
Specifically, the first numerical value can be obtained, judge whether the first numerical value is more than predetermined threshold value, the first numerical value is big if judging Closed-loop path operation irregularity where predetermined threshold value, resistance, preliminary filling loop, if judging, the first numerical value is not more than default threshold Value, the closed-loop path where resistance, preliminary filling loop are working properly.Wherein, the first numerical value is equal to the first steady-state current value and second The business of the absolute value of the difference of steady-state current value and the first steady-state current value.Wherein, predetermined threshold value is the smaller the better, and predetermined threshold value is got over It is small, show that the working condition of closed-loop path where resistance, preliminary filling loop is better, it is more stable, in a kind of implement scene, preset Threshold value can be the absolute value of measurement accuracy corresponding to processing component.
Wherein, be provided above the methods of two kinds of first steady state voltage values of acquisition, one of which method get the One steady state voltage valueThen the first steady-state current valueIt is another The first steady state voltage value that kind method is gotThen One steady-state current valueR1For the resistance of resistance Value, I1For the first steady-state current value.
The method of two kinds of second steady state voltage values of acquisition, the second stable state that one of which method is got has been provided above Magnitude of voltageThen the second steady-state current value The second steady state voltage value that another method is gotThen Second steady-state current valueRY For the resistance on pre- refunds road, I2For the second steady-state current value.
It should be noted that in the embodiment of the present invention, processing component is not limited and obtains the first steady state voltage value and second The sequencing of steady state voltage value.
Wherein, if processing component synchronously obtains the first steady state voltage value and the second steady state voltage value, it can so improve and obtain The efficiency of the first steady state voltage value and the second steady state voltage value is taken, improves the detection of electric current detecting method in cell high voltage loop Efficiency.
In the prior art, parasitic capacitance is there may be in the closed-loop path where current detection circuit, causes what is got The steady state voltage value at the resistance both ends in current detection circuit and the steady state voltage value at preliminary filling loop both ends are inaccurate, and this just leads Cause the resistance that gets and the electric current in preliminary filling loop inaccurate, and then the resistance, pre- for causing to be judged according to the two current values Whether working properly closed-loop path where filling loop judged result be inaccurate.
In order that it is that the closure where how judging resistance, preliminary filling loop is returned to obtain reader to be easier to understand the embodiment of the present invention Whether road is working properly, and electric current detecting method in another cell high voltage loop is provided below, for judging the electricity shown in Fig. 2 Whether the closed-loop path where resistance, preliminary filling loop in the high tension loop of pond in current detection circuit 100 is working properly, this method Processing component 101 is implemented in, as shown in Figure 16, this method comprises the steps the flow chart of this method：
Step 901, closure switch.
Processing component 101 can be closed by sending closure signal to switch with controlling switch.
Step 902, first steady state voltage value at resistance both ends is obtained, and obtains second steady state voltage at preliminary filling loop both ends Value.
Step 903, according to the first steady state voltage value and the resistance value of resistance, the first steady-state current value is obtained, and according to Second steady state voltage value and the resistance value in preliminary filling loop, obtain the second steady-state current value.
Step 904, the first numerical value is obtained.
First numerical value is equal to the absolute value and the first stable state electricity of the difference of the first steady-state current value and the second steady-state current value The business of flow valuve.
Step 905, judge whether the first numerical value is more than predetermined threshold value.
If the determination result is YES, then step 906 is performed, otherwise, performs step 907.
Step 906, the closed-loop path operation irregularity where resistance, preliminary filling loop is judged.
Step 907, judge that the closed-loop path where resistance, preliminary filling loop is working properly.
In the embodiment of the present invention, steady state voltage value and the preliminary filling loop both ends at accurate resistance both ends can be got Steady state voltage value, then according to the steady state voltage value at accurate resistance both ends and the steady state voltage value at preliminary filling loop both ends, obtain The resistance and the current value in preliminary filling loop got are also accurate, so according to the two current values break the resistance, preliminary filling return Closed-loop path where road judged result whether working properly is accurate, then just improve get judgement resistance, The accuracy of closed-loop path where preliminary filling loop judged result whether working properly.
The embodiment of the present invention also provides a kind of computer storage computer-readable recording medium, including：Computer executable instructions, when the meter Calculation machine executable instruction performs following steps when being run：
In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively.
Changed with time trend according to the magnitude of voltage at the resistance both ends, and obtained respectively at least three sampling instants The magnitude of voltage at the resistance both ends got, obtain first steady state voltage value at the resistance both ends.
The technical scheme of the embodiment of the present invention has the advantages that：
In the embodiment of the present invention, because current detection circuit is integrated in the high tension loop of battery, this just causes electric current to examine Connecting line in slowdown monitoring circuit between each component is shorter, reduces the propagation path of electric current, has saved cost, and to a certain degree On reduce the consume of electric current, then improve to a certain extent the resistance that current detection circuit is got current value and The accuracy of the current value in preliminary filling loop, the accuracy of the electric current of the battery modules got is improved, reduces battery modules The probability of security incident occurs during power supply, the security of battery modules power supply is improved, in addition, also improving to a certain extent The accuracy of closed-loop path where judging resistance and preliminary filling loop judged result whether working properly.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.

Claims (27)

  1. A kind of 1. current detection circuit in cell high voltage loop, it is characterised in that including：
    Processing component；
    Resistance, the resistance include negative pole connection end and non-negative pole connection end, and the negative pole connection end is connected with the non-negative pole End is connected to the processing component；
    Preliminary filling loop, the preliminary filling loop include anode connection terminal and non-anode connection terminal, the anode connection terminal with it is described non- Anode connection terminal is connected to the processing component, and the non-anode connection terminal is connected with the non-negative pole connection end.
  2. 2. current detection circuit as claimed in claim 1, it is characterised in that the processing component, be used for：
    In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively；
    Changed with time trend according to the magnitude of voltage at the resistance both ends, and got respectively at least three sampling instants The resistance both ends magnitude of voltage, obtain first steady state voltage value at the resistance both ends.
  3. 3. current detection circuit as claimed in claim 2, it is characterised in that the processing component, be additionally operable to：
    In at least three sampling instant, the magnitude of voltage at preliminary filling loop both ends is obtained respectively；
    Changed with time trend according to the magnitude of voltage at preliminary filling loop both ends, and obtained at least three sampling instant The magnitude of voltage at the preliminary filling loop both ends got, obtain second steady state voltage value at preliminary filling loop both ends.
  4. 4. current detection circuit as claimed in claim 3, it is characterised in that the processing component, be additionally operable to：
    According to first steady state voltage value and the first resistor value of the resistance, the first stable state for obtaining the resistance is electric Stream, and according to second steady state voltage value and the second resistance value in the preliminary filling loop, obtain the of the preliminary filling loop Two steady-state current values；
    According to first steady-state current value and second steady-state current value, electric current inspection as claimed in claim 1 is judged Whether slowdown monitoring circuit is working properly.
  5. 5. current detection circuit as claimed in claim 1, it is characterised in that the preliminary filling loop includes：
    Switch and preliminary filling resistance, the switch, the preliminary filling resistance are connected on the anode connection terminal and the non-positive pole Between connection end, the switch is connected with the anode connection terminal, and the preliminary filling resistance is connected with the non-anode connection terminal.
  6. 6. current detection circuit as claimed in claim 5, it is characterised in that the preliminary filling resistance includes：
    At least one resistance；And/or
    At least one electric resistance array.
  7. 7. current detection circuit as claimed in claim 5, it is characterised in that the preliminary filling loop also includes：
    Counnter attack connected components, the counnter attack connected components are connected between the anode connection terminal and the switch.
  8. 8. current detection circuit as claimed in claim 1, it is characterised in that also include：
    Isolation strip, it is arranged at the fringe region that the processing component is connected with low tension loop；
    Power Supply Assembly, the both sides of isolation strip are arranged at, the first end of the Power Supply Assembly is connected with the processing component, the confession Second end of electrical component and the power supply unit of peripheral hardware connect；
    Communication component, the both sides of isolation strip are arranged at, the first end of the communication component is connected with the processing component, described logical Believe that the second end of component and the general control system of peripheral hardware connect.
  9. 9. current detection circuit as claimed in claim 1, it is characterised in that also include：
    First partial pressure component, the anode connection terminal are connected by the first partial pressure component with the processing component, and described The first end of one partial pressure component is connected with the anode connection terminal, the second end and the processing component of the first partial pressure component Connection, the 3rd end ground connection of the first partial pressure component；
    Second partial pressure component, the negative pole connection end are connected by the second partial pressure component with the processing component, and described The first end of two partial pressure components is connected with the non-anode connection terminal, the second end and the treatment group of the second partial pressure component Part connects, the 3rd end ground connection of the second partial pressure component.
  10. 10. current detection circuit as claimed in claim 9, it is characterised in that
    The first partial pressure component includes：At least one resistance；And/or at least one electric resistance array；
    The second partial pressure component includes：At least one resistance；And/or at least one electric resistance array.
  11. 11. current detection circuit as claimed in claim 1, it is characterised in that also include：
    At least one load, the non-anode connection terminal are connected by least one load with the non-negative pole connection end.
  12. 12. current detection circuit as claimed in claim 5, it is characterised in that the switch is transistor and/or relay.
  13. 13. current detection circuit as claimed in claim 5, it is characterised in that the switch is connected with the processing component.
  14. 14. a kind of detector, it is characterised in that including electric in the cell high voltage loop any one of claim 1~13 Current detection circuit.
  15. 15. a kind of cell apparatus, it is characterised in that the cell apparatus includes：
    Battery modules, the battery modules include positive pole and negative pole；
    Current detection circuit in cell high voltage loop as any one of claim 1~13, the cell high voltage loop Middle current detection circuit is connected between the positive pole and the negative pole, and the anode connection terminal is connected with the positive pole, described Negative pole connection end is connected with the negative pole.
  16. 16. a kind of delivery vehicle, it is characterised in that including in the cell high voltage loop any one of claim 1~13 Current detection circuit.
  17. 17. electric current detecting method in a kind of cell high voltage loop, it is characterised in that methods described is applied to include claim 1 In described cell high voltage loop in current detection circuit, the processing component is implemented in, methods described includes：
    In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively；
    Changed with time trend according to the magnitude of voltage at the resistance both ends, and got respectively at least three sampling instants The resistance both ends magnitude of voltage, obtain first steady state voltage value at the resistance both ends.
  18. 18. method as claimed in claim 17, it is characterised in that methods described also includes：
    In at least three sampling instant, the magnitude of voltage at preliminary filling loop both ends is obtained respectively；
    Changed with time trend according to the magnitude of voltage at preliminary filling loop both ends, and obtained at least three sampling instant The magnitude of voltage at the preliminary filling loop both ends got, obtain second steady state voltage value at preliminary filling loop both ends.
  19. 19. method as claimed in claim 18, it is characterised in that methods described also includes：
    According to first steady state voltage value and the first resistor value of the resistance, the first stable state for obtaining the resistance is electric Stream, and according to second steady state voltage value and the second resistance value in the preliminary filling loop, obtain the of the preliminary filling loop Two steady-state current values；
    According to first steady-state current value and second steady-state current value, judge whether the current detection circuit works Normally.
  20. 20. method as claimed in claim 19, it is characterised in that according to first steady-state current value and described second steady State current value, whether the closed-loop path where judging the resistance, the preliminary filling loop is working properly, including：
    The first numerical value is obtained, first numerical value is equal to the difference of first steady-state current value and second steady-state current value Absolute value and first steady-state current value business；
    Judge whether first numerical value is more than predetermined threshold value；
    If judging, first numerical value is more than predetermined threshold value, the closed-loop path work where the resistance, the preliminary filling loop It is abnormal；
    If judging, first numerical value is not more than predetermined threshold value, the closed-loop path work where the resistance, the preliminary filling loop Make normal.
  21. 21. method as claimed in claim 20, it is characterised in that：The predetermined threshold value is to be measured corresponding to the processing component The absolute value of precision.
  22. 22. method as claimed in claim 17, it is characterised in that：Every adjacent two at least three sampling instant The time interval of sampling instant is equal.
  23. 23. method as claimed in claim 17, it is characterised in that at least three sampling instants, obtain the resistance respectively The magnitude of voltage at both ends, including：
    In at least three sampling instant, the voltage signal of the negative pole connection end of the resistance is gathered respectively, and is gathered respectively The voltage signal of the non-negative pole connection end of the resistance；
    According to the voltage signal of the negative pole connection end of the resistance collected respectively at least three sampling instant and The voltage signal of the non-negative pole connection end of the resistance, obtain magnitude of voltage of the resistance both ends at least three sampling instants.
  24. 24. method as claimed in claim 17, it is characterised in that changed with time according to the magnitude of voltage at the resistance both ends Trend, and the magnitude of voltage at the resistance both ends that at least three sampling instants are got respectively, obtain the resistance both ends The first steady state voltage value, including：
    According in change procedure of the magnitude of voltage at the resistance both ends by initial voltage value to steady state voltage value, the resistance both ends Magnitude of voltage change with time trend, and at the resistance both ends that at least three sampling instant is got respectively Magnitude of voltage, obtain first steady state voltage value at the resistance both ends.
  25. 25. method as claimed in claim 18, it is characterised in that at least three sampling instant, obtain respectively described in The magnitude of voltage at preliminary filling loop both ends, including：
    In at least three sampling instant, the voltage signal of the anode connection terminal in the preliminary filling loop is gathered respectively, and is distinguished Gather the voltage signal of the non-anode connection terminal in the preliminary filling loop；
    According to the voltage signal of the anode connection terminal in the preliminary filling loop that at least three sampling instant collects respectively, And the voltage signal of the non-anode connection terminal in the preliminary filling loop, preliminary filling loop both ends are obtained when at least three sample The magnitude of voltage at quarter.
  26. 26. method as claimed in claim 18, it is characterised in that according to the magnitude of voltage at preliminary filling loop both ends with the time Variation tendency, and the magnitude of voltage at the preliminary filling loop both ends that at least three sampling instant is got, described in acquisition Second steady state voltage value at preliminary filling loop both ends, including：
    According in change procedure of the magnitude of voltage at preliminary filling loop both ends by initial voltage value to steady state voltage value, the preliminary filling The magnitude of voltage at loop both ends changes with time trend, and the preliminary filling got at least three sampling instant returns The magnitude of voltage at road both ends, obtain second steady state voltage value at preliminary filling loop both ends.
  27. 27. a kind of computer stores computer-readable recording medium, it is characterised in that including：Computer executable instructions, when the computer can be held Row instruction performs following steps when being run：
    In at least three sampling instants, the magnitude of voltage at the resistance both ends is obtained respectively；
    Changed with time trend according to the magnitude of voltage at the resistance both ends, and got respectively at least three sampling instants The resistance both ends magnitude of voltage, obtain first steady state voltage value at the resistance both ends.
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