CN207742316U - Battery detection circuit and battery management system - Google Patents

Battery detection circuit and battery management system Download PDF

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Publication number
CN207742316U
CN207742316U CN201721093344.7U CN201721093344U CN207742316U CN 207742316 U CN207742316 U CN 207742316U CN 201721093344 U CN201721093344 U CN 201721093344U CN 207742316 U CN207742316 U CN 207742316U
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cathode
positive
voltage
relay
measured
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CN201721093344.7U
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Inventor
孙占宇
但志敏
侯贻真
罗杰超
张伟
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Abstract

The utility model discloses a kind of battery detection circuit and battery management systems.The battery detection circuit includes:Positive relay, cathode relay, the first positive sampling module, the first cathode sampling module, the second positive sampling module, the second cathode sampling module and reference data voltage end;Wherein, power battery pack to be measured, the first positive sampling module, the first cathode sampling module, the second cathode sampling module are connect with reference data voltage end.According to battery detection circuit and battery management system that the utility model embodiment provides, the complexity of battery detection circuit cost and battery detection circuit structure is reduced.

Description

Battery detection circuit and battery management system
Technical field
The utility model is related to field of batteries more particularly to a kind of battery detection circuits and battery management system.
Background technology
The energy saving and feature of environmental protection based on electric vehicle, electric vehicle replacing fuel oil automobile have become becoming for car industry development Gesture, core component of the on-vehicle battery group as electric vehicle are the motivational guarantees of electric vehicle normally travel.In order to reduce Risk when on-vehicle battery group energizes, needs the height for designing special Battery Diagnostic circuit to cell safety problem such as battery pack Pressure safety is detected, and corresponding high-voltage safety management strategy is specified to ensure safety of the vehicle-mounted battery pack in electric vehicle Energy.
Currently, in battery detection circuit, usually it sets power battery pack and sampling unit to not common ground connection.Specifically Ground, common ground connection does not refer to the anode of power battery pack and cathode is high-voltage earthing, and sampling unit is low-voltage ground.In order to be isolated Interference of the high-voltage earthing signal of power battery pack to the sampled signal of sampling unit, also has additional isolation after sampling unit Unit.
But isolated location in the prior art can also draw while the high-voltage earthing signal of power battery pack is isolated Enter new interference signal, the accuracy of sampled signal is caused to reduce.
Utility model content
A kind of battery detection circuit of the utility model embodiment offer and battery management system can reduce battery detecting electricity The complexity of road cost and battery detection circuit structure.
According to the one side of the utility model embodiment, a kind of battery detection circuit, including positive relay, cathode are provided Relay, the first positive sampling module, the first cathode sampling module, the second positive sampling module, the second cathode sampling module and Reference data voltage end;Wherein,
The anode of power battery pack to be measured is connect with positive relay, cathode and the cathode relay of power battery pack to be measured Connection, the first positive sampling module, the first cathode sampling module, the second positive sampling module, the second cathode sampling module difference It is connect with reference data voltage end;And wherein,
First positive sampling module be configured as acquiring the first end of positive relay power battery pack to be measured the One positive sampled signal;
First cathode sampling module be configured as acquiring the first end of cathode relay power battery pack to be measured One cathode sampled signal;
Second positive sampling module be configured as acquiring the second end of positive relay power battery pack to be measured the Two positive sampled signals;
Second cathode sampling module be configured as acquiring the second end of cathode relay power battery pack to be measured Two cathode sampled signals.
According to the another aspect of the utility model embodiment, a kind of battery management system, including battery as above inspection are provided Slowdown monitoring circuit.
According to the battery detection circuit and battery management system in the utility model embodiment, battery detection circuit includes just It is pole relay, cathode relay, the first positive sampling module, the first cathode sampling module, the second positive sampling module, second negative Pole sampling module, sampling module are connected to same reference voltage terminal with power battery pack to be measured, to simplify circuit structure, improve The accuracy of sampled signal.
Also, in the utility model embodiment, high pressure can be sampled, the integration that Insulation monitoring and relay diagnose Circuit carries out Integrated design with battery management system, so that battery management system is had high pressure sampling, Insulation monitoring and relay and examines Disconnected function can reduce the complexity of battery detection circuit cost and battery detection circuit structure, improve battery management The treatment effeciency of system.
Description of the drawings
It, below will be in the utility model embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment Required attached drawing is briefly described, for those of ordinary skill in the art, what is do not made the creative labor Under the premise of, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram for showing the battery detection circuit according to one embodiment of the utility model;
Fig. 2 is the structural schematic diagram for showing the battery detection circuit according to another embodiment of the utility model;
Fig. 3 is the circuit diagram for showing the battery detection circuit according to the utility model exemplary embodiment;
Fig. 4 is the structural schematic diagram for showing the battery detection circuit according to the utility model another embodiment;
Fig. 5 is the circuit diagram for showing the battery detection circuit according to the another exemplary embodiment of the utility model;
Fig. 6 is the structural schematic diagram for showing the battery management system according to one embodiment of the utility model;
Fig. 7 is the circuit diagram for showing the battery management system according to one embodiment of the utility model;
Fig. 8 is the structural schematic diagram for showing the battery management system according to another embodiment of the utility model;
Fig. 9 is the circuit diagram for showing the battery management system according to another embodiment of the utility model.
Specific implementation mode
The feature and exemplary embodiment of the various aspects of the utility model is described more fully below, in order to keep this practicality new The object, technical solution and advantage of type are more clearly understood, with reference to the accompanying drawings and embodiments, to the utility model into advance one Step detailed description.It should be understood that specific embodiment described herein is only configured to explain the utility model, it is not configured as Limit the utility model.To those skilled in the art, the utility model can be in not needing these details Implement in the case of some details.Below the description of embodiment is used for the purpose of carrying by showing the example of the utility model For being better understood to the utility model.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including There is also other identical elements in the process, method, article or equipment of the element.
In the utility model embodiment, for battery variety, power battery pack to be detected can be lithium ion battery, Lithium metal battery, lead-acid battery, nickel separation cell, Ni-MH battery, lithium-sulfur cell, lithium-air battery or sodium-ion battery, at this It is not specifically limited in utility model embodiment.For battery scale, power battery pack to be measured can be battery core monomer, also may be used To be battery modules or battery pack, it is not specifically limited in the utility model embodiment.
The battery detection circuit and battery management system that the utility model embodiment provides can sample high pressure, insulation The integrated circuit of detection and relay diagnosis carries out Integrated design with battery management system, and battery management system is made to have high pressure The function of sampling, Insulation monitoring and relay diagnosis.
In order to be better understood from the utility model, with reference to Fig. 1, Fig. 2 and Fig. 3, it is described in detail according to the utility model The battery detection circuit of embodiment, it should be noted that these embodiments are not for limiting range disclosed by the utility model.
Fig. 1 is the structural schematic diagram for showing the battery detection circuit according to one embodiment of the utility model.As shown in Figure 1, Battery detection circuit includes positive relay G1, cathode relay G2, the first positive sampling module F1, the first cathode sampling module F2, the second positive sampling module F3, the second cathode sampling module F4 and reference data voltage end GND.
In the utility model embodiment, the anode of power battery pack to be measured is connect with positive relay, power electric to be measured The cathode of pond group is connect with cathode relay, the first positive sampling module, the first cathode sampling module, the second anode sampling mould Block, the second cathode sampling module are connect with reference data voltage end respectively;
And wherein, the first positive sampling module is configured as acquiring the power electric to be measured in the first end of positive relay The positive sampled signal of the first of pond group;First cathode sampling module be configured as acquiring cathode relay first end it is to be measured First cathode sampled signal of power battery pack;Second positive sampling module is configured as acquiring the second end in positive relay Power battery pack to be measured the second positive sampled signal;Second cathode sampling module is configured as acquiring in cathode relay Second cathode sampled signal of the power battery pack to be measured of second end.
In this embodiment, sampling module is connected to the same reference data voltage end with power battery pack to be measured, compares When sampling module is connected to different reference data voltage ends from power battery pack to be measured, need to add isolation list to sampling module The situation of member, introduces new interference signal while simplifying circuit structure, while avoiding adding isolated location, sampled signal Accuracy higher.
With reference to Fig. 2 descriptions according to the battery detection circuit of another embodiment of the utility model, Fig. 2 is shown according to this The structural schematic diagram of the battery detection circuit of another embodiment of utility model.As shown in Fig. 2, the difference of Fig. 2 and Fig. 1 exists In in some embodiments, which can also include:First positive sampled point S1, the first cathode sampled point S2, Second positive sampled point S3, the second cathode sampled point S4, first voltage pull-up module F5 and second voltage pull-up module F6.
It should be noted that the utility model embodiment is not limited to the description in above-described embodiment, and in fig. 2 The specific module shown.In some embodiments, which can include only part of module therein, that is, It says, the battery detection circuit in the utility model embodiment includes that more flexible module configures, with reference to specific embodiment It illustrates.
In one embodiment, battery detection circuit further include the first positive sampled point, the first cathode sampled point, second just Pole sampled point, the second cathode sampled point.
In this embodiment, the first positive sampling module is additionally configured to adopt first the first anode of positive sampled point offer Sample signal;First cathode sampling module is additionally configured to provide the first cathode sampled signal to the first cathode sampled point;Second just Pole sampling module is additionally configured to provide the second positive sampled signal to the second positive sampled point;Second cathode sampling module also by It is configured to provide the second cathode sampled signal to the second cathode sampled point.
With continued reference to Fig. 2, in one embodiment, one end of the first positive sampling module F1 and power battery pack to be measured The first end of anode and positive relay G1 connect, the other end and the first anode sampled point S1 of the first anode sampling module F1 and The GND connections of reference data voltage end.
The first end of one end of the first cathode sampling module F2 and the cathode and cathode relay G2 of power battery pack to be measured Connection, the other end of the first cathode sampling module F2 are connect with the first cathode sampled point S2 and reference data voltage end GND.
One end of second positive sampling module F3 is connect with the second end of positive relay G1, the second positive sampling module F3 The other end connect with the second anode sampled point S3 and reference data voltage end GND.
One end of second cathode sampling module F4 is connect with the second end of cathode relay G2, the second cathode sampling module F4 The other end connect with the second cathode sampled point S4 and reference data voltage end GND.
In this embodiment, the virtual voltage of reference data voltage end GND can be according to the yard of high pressure sample circuit Scape and demand are set.The voltage value of reference data voltage end GND can be used as battery in the utility model embodiment to examine The reference voltage of slowdown monitoring circuit, you can regard the reference voltage of reference data voltage end GND as opposite 0V.
As an example, if the virtual voltage of reference data voltage end GND is 6V, the first anode sampled point S1 is collected The virtual voltage of sampled signal be 22V, then reference voltage 6V can be denoted as 0V, adopted the first positive sampled point S1 is collected The voltage of sample signal is denoted as 16V.
In the battery detection circuit, the other end and the first anode sampled point S1 of the first positive sampling module F1 and reference Reference voltage terminal GND connections;The other end and the first cathode sampled point S2 and reference data voltage of first cathode sampling module F2 Hold GND connections;The other end and the second anode sampled point S3 and reference data voltage end GND of second positive sampling module F3 connects It connects;The other end of second cathode sampling module F4 is connect with the second cathode sampled point S4 and reference data voltage end GND.
That is, the sampled voltage U of the first positive sampled signal of the first positive sampled point S1SP1, the sampling of the first cathode The sampled voltage U of the first cathode sampled signal of point S2SP2, the sampling of the second positive sampled signal of the second positive sampled point S3 Voltage USP3, the sampled voltage U of the second cathode sampled signal of the second cathode sampled point S4SP4Share a reference data voltage.
As an example, which can be low pressure ground UV_GND.
As reference data voltage end GND for low pressure UV_GND, the first positive sampling module F1, the first cathode sample mould Block F2, the second positive sampling module F3, the second cathode sampling module F4 and power battery pack to be measured are low pressure common ground connection.
In the utility model embodiment, just by the first positive sampling module F1, the first cathode sampling module F2, second Pole sampling module F3 or the second cathode sampling module F4 detect voltage, when above-mentioned sampling module uses identical reference data voltage Such as when low pressure common ground connection, it can avoid the occurrence of and need additionally to add isolated location to adopting because reference data voltage end is different Sample signal carries out the case where isolation processing, to simplify circuit structure, reduces caused by sampled signal carries out isolation processing accidentally Difference improves the precision of the voltage value of sampled signal.
In some embodiments, when above-mentioned sampling module is with low pressure to refer to, since the pressure drop of electric current, first is negative The sampled voltage U of the first cathode sampled signal of pole sampled point S2SP2Letter is sampled with the second cathode of the second cathode sampled signal S4 Number sampled voltage USP4The voltage (i.e. opposite 0V) of reference data voltage end GND may be less than.In such situation Under, sampled voltage USP2With sampled voltage USP4Negative value may be denoted as.
Therefore, in some embodiments, it is desirable to the sampling electricity of the first cathode sampled signal to the first cathode sampled point S2 Press USP2, the second cathode sampled signal S4 the second cathode sampled signal sampled voltage USP4Voltage pull-up processing is carried out respectively.
With continued reference to Fig. 2, in one embodiment, which further includes first voltage pull-up module F5 and Two voltage pull-up module F6.
Wherein, first voltage pull-up module F5 is connect with the first cathode sampled point S2, and first voltage pull-up module F5 It is configured as the first cathode sampled signal pull-up being positive voltage signal.
Second voltage pull-up module F6 is connect with the second cathode sampled point S4, and second voltage pull-up module F6 is configured It is positive voltage signal to pull up the second cathode sampled signal.
In this embodiment, using preset pull-up voltage value, the first cathode of the first cathode sampled point S2 is sampled into letter Number voltage and the voltage of the second cathode sampled signal of the second cathode sampled point S4 carry out pull-up processing so that the first of output The voltage U of the first cathode sampled signal of cathode sampled point S2SP2And the second cathode of the second cathode sampled point S4 of output is adopted The voltage U of sample signalSP4It is above the voltage of reference data voltage end.That is, being handled through overvoltage pull-up, the first cathode The voltage U of the first cathode sampled signal of sampled point S1SP2With the voltage of the second cathode sampled signal of the second cathode sampled point S4 USP4Positive value can be denoted as.
It, can be based on the acquired from the first positive sampled point S1 according to the battery detection circuit of the utility model embodiment One positive sampled signal, the first cathode sampled signal acquired from the first cathode sampled point S2 are adopted from the second anode sampled point S3 The the second cathode sampled signal the second of collection positive sampled signal and acquired from the second cathode sampled point S4, can examine battery Power battery pack to be measured in slowdown monitoring circuit carries out high tension loop voltage sample, and to the Insulation monitoring of power battery pack to be measured and The relay of battery detection circuit diagnoses.
With reference to Fig. 3, by specific embodiment detailed description according to the battery detection circuit of the utility model embodiment Concrete structure.
Fig. 3 is the structural schematic diagram according to exemplary embodiment battery detection circuit in the utility model embodiment.Fig. 3 shows Meaning property shows the first positive sampling module F1, the first cathode sampling module F2, the second positive sampling module F3, the second cathode The concrete structure of sampling module F4, first voltage pull-up module F5, second voltage pull-up module F6.
As shown in figure 3, in one embodiment, the first anode sampling module F1 may include concatenated first resistor network R1 and second resistance network R2.
It one end of first resistor network R1 can be with the first end of the anode and positive relay G1 of power battery pack to be measured Connection, the other end of first resistor network R1 are connect with one end of the first anode sampled point S1 and second resistance network R2 respectively.
The other end of second resistance network R2 can be connect with reference data voltage end GND.
In one example, the resistor network form and resistance value size and second resistance network R2 of first resistor network R1 Resistor network form and resistance value size can be identical.
In this embodiment, first resistor network R1 and second resistance network R2 can play the role of partial pressure.By adjusting The resistance value size of the resistance value size and second resistance network R2 of first resistor network R1, can sampled point S1 positive to first the The variation range of one positive sampled signal is adjusted.
In one embodiment, the first cathode sampling module F2 includes concatenated 3rd resistor network R3 and the 4th resistance net Network R4.
One end of 3rd resistor network R3 is connect with reference data voltage end GND, the other end of 3rd resistor network R3 with One end of first cathode sampled point S2 and the 4th resistor network R4 connects.
The other end of 4th resistor network R4 connects with the first end of the cathode of power battery pack to be measured and cathode relay G2 It connects.
In one example, the resistor network form and resistance value size and the 4th resistor network R4 of 3rd resistor network R3 Resistor network form and resistance value size can be identical.
In this embodiment, 3rd resistor network R3 and the 4th resistor network R4 can play the role of partial pressure.By adjusting The resistance value size of the resistance value size and the 4th resistor network R4 of 3rd resistor network R3, can be to the first cathode sampling module F2's The variation range of first cathode sampled signal S2 is adjusted.
In one embodiment, the second anode sampling module F3 includes concatenated 5th resistor network R5 and the 6th resistance net Network R6.
One end of 5th resistor network R5 is connect with the second end of positive relay G1, the other end of the 5th resistor network R5 It is connect with one end of the second anode sampled point S3 and the 6th resistor network R6.
The other end of 6th resistor network R6 is connect with reference data voltage end GND.
In some instances, the resistor network form and resistance value size and the 6th resistor network R6 of the 5th resistor network R5 Resistor network form and resistance value size can be identical.
In this embodiment, the 5th resistor network R5 and the 6th resistor network R6 play the role of partial pressure.By adjusting the 5th The resistance value size of the resistance value size and the 6th resistor network R6 of resistor network R5, can be to the second of the second anode sampling module F3 The variation range of positive sampled signal S3 is adjusted.
In one embodiment, the second cathode sampling module F4 includes concatenated 7th resistor network R7 and the 8th resistance net Network R8.
One end of 7th resistor network R7 is connect with reference data voltage end GND, the other end of the 7th resistor network R7 with One end of second cathode sampled point S4 and the 8th resistor network R8 connects.
The other end of 8th resistor network R8 is connect with the second end of cathode relay G2.
In some instances, the resistor network form and resistance value size and the 8th resistor network R8 of the 7th resistor network R7 Resistor network form and resistance value size can be identical.
In this embodiment, the 7th resistor network R7 and the 8th resistor network R8 play the role of partial pressure.By adjusting the 7th The resistance value size of the resistance value size and the 8th resistor network R8 of resistor network R7, can be to the second of the second cathode sampling module F4 The variation range of cathode sampled signal S4 is adjusted.
With continued reference to Fig. 3, in one embodiment, first voltage pull-up module F5 may include the first direct voltage source DV1 and the 9th resistor network R9, one end of the 9th resistor network R9 are connect with the first cathode sampled point S2, the 9th resistor network R9 The other end connect with the first direct voltage source DV1.
In this embodiment, it can be a preset value that the first direct voltage source DV1, which can generate pull-up voltage U1, U1, And U1 can be more than the voltage value of reference data voltage end GND.
In one embodiment, second voltage pull-up module F6 may include the second direct voltage source DV2 and the tenth resistance Network R10, one end of the tenth resistor network R10 are connect with the second cathode sampled point S4, the other end of the tenth resistor network R10 with Second direct voltage source DV2 connections.
In this embodiment, the first direct voltage source DV2 can generate pull-up voltage U2, and U2 can be one default Value, and U2 can be more than the voltage value of reference data voltage end GND.
In one example, upper pull-up voltage U1 and upper pull-up voltage U2 can be set as identical pull-up voltage value.
In battery detection circuit shown in Fig. 3, first resistor network R1 to the tenth resistor network R10 includes respectively one A resistance.In further embodiments, first resistor network R1 to the tenth resistor network R10 respectively may include series connection and/or More than two resistance in parallel.
It should be noted that the combining form and resistance value size of first resistor network R1 to the tenth resistor network R10 can be with In the practical application scene of battery detecting, set according to actual conditions.
As an example, the combining form and resistance value size of first resistor network R1 to the tenth resistor network R10 can be with Need sampling precision to be achieved and sample range when being sampled into horizontal high voltage by battery detection circuit, in the battery detection circuit on In the sample range limitation and the sampling precision and the battery detection circuit that can reach of stating the sampling module in embodiment Tolerance range of the operating voltage of component etc. determines.
With continued reference to Fig. 3, in some embodiments, the first anode sampling module F1 can also include first switch device One end of K1, first resistor network R1 are connect by first switch device K1 with the anode of power battery pack to be measured.
In this embodiment it is possible to which controlling the first anode sampled point S1 by the open and close of first switch device K1 is No to provide the first positive sampled signal, when first switch device K1 is closed, the first anode sampled point S1 can provide first just Pole sampled signal, when first switch device K1 is disconnected, the first anode sampled point S1 can stop providing the first anode sampling letter Number.
In some embodiments, the first cathode sampling module F2 can also include second switch device K2,3rd resistor net One end of network R3 is connect by second switch device K2 with reference data voltage end GND.
In this embodiment it is possible to which controlling the first cathode sampled point S2 by the open and close of second switch device K2 is The first cathode sampled signal of no offer, when second switch device K2 is closed, it is negative that the first cathode sampled point S2 can provide first Pole sampled signal, when second switch device K2 is disconnected, the first cathode sampled point S2 can stop providing the first cathode sampling letter Number.
In some embodiments, the second positive sampling module F3 can also include third switching device K3, the 5th resistance net One end of network R5 is connect by third switching device K3 with the second end of positive relay G1.
In this embodiment it is possible to which controlling the second anode sampled point S3 by the open and close of third switching device K3 is No to provide the second positive sampled signal, when third switching device K3 is closed, the second anode sampled point S3 can provide second just Pole sampled signal, when third switching device K3 is disconnected, the second anode sampled point S3 can stop providing the second anode sampling letter Number.
In some embodiments, the second cathode sampling module F4 can also include the 4th switching device K4, the 7th resistance net One end of network R7 is connect by the 4th switching device K4 with reference data voltage end GND.
In this embodiment it is possible to which controlling the second cathode sampled point S4 by the open and close of the 4th switching device K4 is The second cathode sampled signal of no offer, when the second cathode sampled point S4 is closed, the second cathode sampled point S4 can provide second Cathode sampled signal, when the second cathode sampled point S4 is disconnected, the second cathode sampled point S4 can stop the second cathode of offer and adopt Sample signal.
In some embodiments, the first positive sampled point S1, the first cathode sampled point S2, the second anode sampled point S3 and the Two cathode sampled point S4 can be attached with the sampling unit for sampling.In one example, sampling unit for example may be used To be analog-digital converter (Analog to Digital Converter, ADC).
As an example, ADC1 can be connect by sampling line SP1 with the first anode sampled point S1, pass through the first anode The first positive sampled signal that sampled point S1 is provided obtains the voltage on second resistance network.
As an example, ADC2 can be connect by sampling line SP2 with the first cathode sampled point S2, pass through the first cathode The first cathode sampled signal that sampled point S2 is provided obtains the voltage in 3rd resistor.
As an example, ADC3 can be connect by sampling line SP3 with the second anode sampled point S3, pass through the second anode The second positive sampled signal that sampled point S3 is provided obtains the 6th ohmically voltage.
As an example, ADC4 can be connect by sampling line SP4 with the second cathode sampled point S4, pass through the second cathode The second cathode sampled signal that sampled point S4 is provided obtains the 7th ohmically voltage.
Battery detection circuit in the utility model embodiment provides a kind of sampling of high pressure, Insulation monitoring and relay and examines Disconnected integrated circuit scheme can be to the electricity of acquisition battery pack by the battery detection circuit in the utility model embodiment Whether pressure, detection battery pack insulation resistance value, diagnosis relay break down, and circuit structure is simpler, and can reduce electricity Road cost.
In the battery detection circuit of some exemplary embodiments of the utility model, battery to be detected and the first anode sample Module F1, the first cathode sampling module F2, the second anode sampling module F3 and the second cathode sampling module F4 common ground connections, no It needs additional isolated location to handle sampled signal, reduces circuit structure, reduction carries out at isolation sampled signal The error brought is managed, the precision of the voltage value in sampled signal is improved.
With reference to Fig. 4 and Fig. 5 descriptions according to the battery detection circuit of the utility model another embodiment.Fig. 4 is this reality With the structural schematic diagram of the battery detection circuit of novel another embodiment.Fig. 4 labels identical with Fig. 2 indicate identical structure. Battery detection circuit shown in Fig. 4 and battery detection circuit shown in Fig. 2 are essentially identical, the difference is that:
As shown in figure 4, in some embodiments, the first cathode sampling module F2 and the second cathode sampling module can connect The sampled voltage of the first cathode sampled signal S2 and the second cathode can be adopted in voltage pull-up module F7, voltage pull-up module F7 The sampled voltage pull-up of sample signal is positive voltage signal.
With continued reference to Fig. 4, in some embodiments, which can also include the first normal extension resistor network Rnet1, first often hangs resistor network Rnet1First end can with power battery pack to be measured anode connect, first often extension resistance net Network Rnet1Second end connect with reference data voltage end GND.
In one embodiment, battery management system may include the second normal extension resistor network Rnet2, second often hangs resistance Network Rnet2First end connect with the cathode of power battery pack to be measured, second often hangs resistor network Rnet2Second end and reference Reference voltage terminal GND connections.
In another embodiment, battery management system can also include the first normal extension resistor network R simultaneouslynet1And this Second often hangs resistor network Rnet2
Fig. 4 also schematically shows the positive insulation resistance value of power battery pack to be measured and negative insulation resistance value is examined in battery Position where in slowdown monitoring circuit figure.Wherein, RpFor the positive insulation resistance value of power battery pack, RnIt is exhausted for the cathode of power battery pack Edge resistance value.
As shown in phantom in figure 4, RpThe anode of one end and power battery pack to be measured connect, RpThe other end and reference Reference voltage terminal GND connections;RnOne end connect with reference data voltage end GND, RnThe other end and power battery pack to be measured Cathode connects.
Fig. 5 is the circuit diagram according to the battery detection circuit of the utility model another embodiment.Fig. 5 is schematically illustrated First positive sampling module F1, the first cathode sampling module F2, the second positive sampling module F3, the second cathode sampling module F4, Voltage pull-up module F7, first often hang resistor network Rnet1Resistor network R is often hung with secondnet2Concrete structure.
As shown in figure 5, in one embodiment, voltage pull-up module may include direct voltage source DV, the 9th resistance net Network R9 and the tenth resistor network R10.
One end of 9th resistor network R9 is connect with the first cathode sampled point S2, the other end of the 9th resistor network R9 with it is straight The DV connections of galvanic electricity potential source.
In this embodiment, direct voltage source DV and the 9th resistor network R9 can generate pull-up voltage U1, and U1 can be One preset value, and U1 can be more than the voltage value of reference data voltage end GND.
With continued reference to Fig. 5, in one embodiment, one end of the tenth resistor network R10 connects with the second cathode sampled point S4 It connects, the other end of the tenth resistor network R10 is connect with direct voltage source DV.
In this embodiment, upper pull-up voltage U2, and U2 can be generated by direct voltage source DV and the tenth resistor network R10 Can be a preset value, and U2 can be more than the voltage value of reference data voltage end GND.
In one example, upper pull-up voltage U1 and upper pull-up voltage U2 can be set as identical pull-up voltage value.
It in some embodiments, can be negative by first respectively according to the voltage pull-up module F7 in the utility model embodiment The sampled voltage of pole sampled signal S2 and the sampled voltage of the second cathode sampled signal pull-up are positive voltage signal.
With continued reference to Fig. 5, in some embodiments, first often hangs resistor network Rnet1Resistor network R is often hung with secondnet2 Can include respectively a resistance.In further embodiments, first resistor network R is often hungnet1Resistance net is often hung with second Network Rnet2May include respectively more than two resistance of series connection and/or parallel connection.
In some instances, first resistor network R is often hungnet1Resistor network form and resistance value size and second often hang Resistor network Rnet2Resistor network form and resistance value size can be identical.
Fig. 5 also schematically illustrates the positive insulation resistance value of power battery pack to be measured and negative insulation resistance value is examined in battery Position where in slowdown monitoring circuit figure.Wherein, RpFor the positive insulation resistance value of power battery pack, RnIt is exhausted for the cathode of power battery pack Edge resistance value.
As shown in broken line in fig. 5, positive insulation resistance value RpThe anode of one end and power battery pack to be measured connect, Rp's The other end is connect with reference data voltage end GND;Negative insulation resistance value RnOne end connect with reference data voltage end GND, Rn's The other end is connect with the cathode of power battery pack to be measured.
With reference to Fig. 6 and Fig. 7, the battery management system according to the utility model embodiment is described in detail.
Fig. 6 is the structural schematic diagram of battery management system in one embodiment of the utility model.As shown in fig. 6, the cell tube Reason system includes the battery detection circuit in above-described embodiment, and the processor C1 being connect with the battery detection circuit.
Fig. 6 also schematically shows the positive insulation resistance value of power battery pack to be measured and negative insulation resistance value is examined in battery Position where in slowdown monitoring circuit figure.
As shown in the dotted line in Fig. 6, RpThe anode of one end and power battery pack to be measured connect, RpThe other end and reference Reference voltage terminal GND connections;RnOne end connect with reference data voltage end GND, RnThe other end and power battery pack to be measured Cathode connects.
In some embodiments, the processor C1 in battery management system can directly with the first positive sampled point S1, the One cathode sampled point S2, the second anode sampled point S3 and the second cathode sampled point S4 connections.
In this embodiment, processor C1 can be provided is converted to digital signal, the by the first positive sampled signal respectively One negative and positive pole sampled signal is converted to digital signal, the second positive sampled signal is converted to digital signal and the sampling of the second cathode Signal is converted to the function of digital signal.
In further embodiments, battery management system can also include ADC1, and one end of ADC1 is sampled with the first anode Point S1 connections, the other end of ADC1 are connect with processor C1, and ADC1 can be configured as the first positive sampled signal and be converted to number Word signal.
In some embodiments, battery management system can also include ADC2, one end of ADC2 and the first cathode sampled point The other end of S2 connections, ADC2 is connect with processor C1, and ADC2 can be configured as the first negative and positive pole sampled signal and be converted to number Word signal.
In some embodiments, battery management system can also include ADC3, one end of ADC3 and the second positive sampled point The other end of S3 connections, ADC3 is connect with processor C1, and ADC3 can be configured as the second positive sampled signal and be converted to number Signal.
In some embodiments, battery management system can also include ADC4, one end of ADC4 and the second cathode sampled point The other end of S4 connections, ADC4 is connect with processor C1, and ADC4 can be configured as the second cathode sampled signal and be converted to number Signal.
In some embodiments, ADC1, ADC2, ADC3 and ADC4 can be connected to processor C1, processor C1 can be with According to the digital signal, the digital signal of the first negative and positive pole sampled signal, the second anode of the receive first positive sampled signal The digital signal of the digital signal of sampled signal and the second cathode sampled signal is handled.
According to the battery management system of the utility model embodiment, the first positive sampled signal, the first cathode can be based on Sampled signal, the second positive sampled signal and the second cathode sampled signal, to the power battery pack of the utility model embodiment It is sampled into horizontal high voltage, and the insulation resistance value of power battery pack can be detected and diagnose whether relay breaks down.
It, can be by the first end of the first end of positive relay G1 and cathode relay G2 in the utility model embodiment Between voltage as voltage on the inside of power battery group relay to be measured, and can be by the second end and cathode of positive relay G1 Voltage between the second end of relay G2 is as voltage on the outside of power battery group relay to be measured.
In some embodiments, processor C1 can be based on above-described embodiment the first positive sampled signal, the first cathode Sampled signal, the second positive sampled signal and the second cathode sampled signal, are calculated on the inside of the survey power battery group relay Voltage on the outside of voltage and the power battery group relay to be measured.
Below with reference to Fig. 7, by specific embodiment detailed description according to the battery management system of the utility model embodiment Realize the method and steps of power battery pack high pressure sampling to be measured.
In the figure 7, when being closed K1, being closed K2, disconnect K3 and disconnect K4:
First positive sampled point S1 provides the first positive sampled signal, and the first cathode sampled point S2 provides the sampling of the first cathode Signal, the second positive sampled point S3 stop providing the second positive sampled signal, and it is negative that the second cathode sampled point S4 stoppings provide second Pole sampled signal.
Processor C1 can be based on the first positive sampled signal, and the voltage of the first end of positive relay G1 is calculated, The voltage of the power battery pack to be measured of the first end of i.e. positive relay G1, is referred to as power battery pack anode relay to be measured Voltage on the inside of device.
Processor C1 can be based on the first cathode sampled signal, and the voltage of the first end of cathode relay G2 is calculated, That is the voltage of the power battery pack to be measured of the first end of cathode relay, is referred to as, power battery pack negative terminal relay to be measured Voltage on the inside of device.
Processor C1 can be according to the electricity of the first end of the voltage and cathode relay G2 of the first end of positive relay G1 Voltage on the inside of power battery group relay to be measured is calculated in pressure.
That is, processor C1 can be according to voltage on the inside of power battery pack anode relay to be measured and power electric to be measured Voltage on the inside of power battery group relay to be measured is calculated in voltage on the inside of the group negative terminal relay of pond.
Specifically, the first positive sampled signal is obtained by the first positive sampled point S1 the first positive sampled signals provided Sampled voltage Usp1, according to Ohm's law, the sampled voltage U of the first positive sampled signal S1sp1And concatenated first resistor Network R1 and second resistance network R2 calculates the voltage of the power battery pack to be measured of the first end of positive relay G1, i.e., to be measured Voltage on the inside of power battery pack anode relay.
Specifically, the first cathode sampled signal is obtained by the first cathode sampled point S2 the first cathode sampled signals provided Sampled voltage Usp2, according to Ohm's law, the sampled voltage U of the first cathode sampled signal S2sp2And concatenated 3rd resistor Network R3 and the 4th resistor network R4 calculates the voltage of the power battery pack to be measured of the first end of cathode relay G2, i.e., to be measured Voltage on the inside of power battery pack negative terminal relay.
To voltage on the inside of voltage on the inside of power battery pack anode relay to be measured and power battery pack negative terminal relay to be measured Summation can obtain voltage on the inside of power battery group relay to be measured.
In the figure 7, when disconnecting K1, disconnecting K2, be closed K3 and be closed K4:
First positive sampled point S1 stops providing the first positive sampled signal, and the first cathode sampled point S2 stops providing first Cathode sampled signal, the second positive sampled point S3 provide the second positive sampled signal, and it is negative that the second cathode sampled point S4 provides second Pole sampled signal.
Processor C1 can be based on the second positive sampled signal, and the voltage of the second end of positive relay G1 is calculated, The voltage of the power battery pack to be measured of the second end of i.e. positive relay, is referred to as power battery pack anode relay to be measured Outside voltage.
Processor C1 can be based on the second cathode sampled signal, and the voltage of the second end of cathode relay G2 is calculated, That is the voltage of the power battery pack to be measured of the second end of cathode relay is referred to as power battery pack negative terminal relay to be measured Outside voltage.
Processor C1 can be according to the electricity of the second end of the voltage and cathode relay G2 of the second end of positive relay G1 Pressure, is calculated voltage on the outside of power battery group relay to be measured.
That is, processor C1 can be according to voltage and power electric to be measured on the outside of power battery pack anode relay to be measured Voltage on the outside of the group negative terminal relay of pond, is calculated voltage on the outside of power battery group relay to be measured.
Specifically, the second positive sampled signal is obtained by the second positive sampled point S3 the second positive sampled signals provided Sampled voltage Usp3, according to Ohm's law, the sampled voltage U of the second positive sampled signal S3sp3And concatenated 5th resistance Network R5 and the 6th resistor network R6 calculates the voltage of the power battery pack to be measured of the second end of positive relay G1, i.e., to be measured Voltage on the outside of power battery pack anode relay.
Specifically, the second cathode sampling letter is obtained by the second cathode sampled point S4 the second cathode sampled signal S4 provided Number sampled voltage Usp4, according to Ohm's law, the sampled voltage U of the second cathode sampled signal S4sp4, concatenated 7th resistance net Network R7 and the 8th resistor network R8 calculates the voltage of the power battery pack to be measured of the second end of cathode relay G2, i.e., to be measured dynamic Voltage on the outside of power battery pack negative terminal relay.
To voltage on the outside of voltage on the outside of power battery pack anode relay to be measured and power battery pack negative terminal relay to be measured Summation, can obtain voltage on the outside of power battery group relay to be measured.
In this embodiment, when battery management system works, using the battery detection circuit of the utility model embodiment, Pass through sampled voltage Usp1, sampled voltage Usp2, sampled voltage Usp3With sampled voltage Usp4, power battery to be measured can be calculated Voltage on the outside of group relay inside voltage and power battery group relay to be measured, to realize that the battery detection circuit high pressure samples Function.
It continues with reference to figure 7, and by specific embodiment detailed description according to the cell tube of the utility model embodiment The method and step that reason system diagnoses the positive relay and cathode relay of power battery pack to be measured on battery to be detected Suddenly.
In the utility model embodiment, by the voltage of the first end of positive relay G1 and the second of positive relay G1 The absolute difference of the voltage at end is compared with positive relay G1 voltage thresholds, is obtained and positive relay G1 voltage thresholds It is that value is compared as a result, to determine the working condition of positive relay G1.
Specifically, battery detection circuit is utilized to sample power battery pack to be measured into horizontal high voltage according in above-described embodiment Method and steps obtains the voltage of the first end of positive relay G1, i.e., voltage on the inside of power battery pack anode relay to be measured UB+(inside), the voltage of the second end of positive relay G1, i.e., voltage on the outside of power battery pack anode relay to be measured UB+(outside)
In one embodiment, when the positive relay G1 conductings of control, if UB+(inside)And UB+(outside)Under satisfaction Formula (7) is stated, determines that the working condition of anode relay G1 is normal.
|UB+(inside)-UB+(outside)|≤Urelay+ (1)
In above-mentioned formula (1), Urelay+For preset power battery pack anode relay coil pressure drop to be measured.
According to above-mentioned formula (1), when the positive relay G1 conductings of control, if the electricity of the first end of positive relay G1 Pressure and the absolute difference of the voltage of the second end of positive relay G1 be less than or equal to the power battery pack anode to be measured of setting after When electric apparatus coil pressure drop, determine that anode relay G1 is normal condition.
When the positive relay G1 conductings of control, if UB+(inside)And UB+(outside)Meet following formula (2), determines just Pole relay G1 breaks down.
|UB+(inside)-UB+(outside)| > Urelay+ (2)
According to above-mentioned formula (2), when the positive relay G1 conductings of control, if the electricity of the first end of positive relay G1 Pressure and the absolute difference of the voltage of the second end of positive relay G1 are more than the power battery pack anode relay to be measured of setting When coil pressure drop, determine that the working condition of anode relay G1 is malfunction.
Further, when the positive relay G1 conductings of control, if UB+(inside)And UB+(outside)Meet above-mentioned formula (2) And UB+(outside)=0, it may be determined that positive relay G1 breaks down and is off state.
In another embodiment, when the positive relay of control disconnects, if UB+(inside)And UB+(outside)In satisfaction State formula (1), it may be determined that positive relay G1 breaks down and is adhesion state.
In this embodiment, when controlling anode relay G1, UB+(inside)And UB+(outside)Meet above-mentioned formula (2) and UB+(outside)=0, it may be determined that positive relay G1 is normal condition.
It, can also be by the voltage of the first end of cathode relay G2 and cathode relay G2 in the utility model embodiment Second end voltage absolute difference, be compared, obtain and cathode relay G2 with cathode relay G2 voltage thresholds It is that voltage threshold is compared as a result, and according to it is being compared with cathode relay G2 voltage thresholds as a result, determine cathode after The working condition of electric appliance G2.
Specifically, battery detection circuit is utilized to sample power battery pack to be measured into horizontal high voltage according in above-described embodiment Method and steps, the voltage of the first end of cathode relay G2, i.e., power battery pack negative terminal relay inside voltage to be measured UB-(inside), the voltage of the second end of cathode relay G2, i.e., voltage on the outside of power battery pack negative terminal relay to be measured UB-(outside)
In one embodiment, when controlling cathode relay G2 conductings, if UB-(inside)And UB-(outside)Under satisfaction When stating formula (3), determine that the working condition of cathode relay G2 is normal.
|UB-(inside)-UB-(outside)|≤Urelay- (3)
In above-mentioned formula (3), Urelay-Indicate preset power battery pack negative terminal relay coil pressure drop to be measured.
According to above-mentioned formula (3), when controlling cathode relay G2 conductings, if the electricity of the first end of cathode relay G2 Pressure and the absolute difference of the voltage of the second end of cathode relay G2 be less than or equal to preset power battery pack negative terminal to be measured after When electric apparatus coil pressure drop, determine that the working condition of cathode relay G2 is normal.
When controlling cathode relay G2 conductings, if UB-(inside)And UB-(outside)When meeting following formula (10), really Determine cathode relay G2 to break down.
|UB-(inside)-UB-(outside)| > Urelay- (4)
According to above-mentioned formula (4), when controlling cathode relay G2 conductings, if the electricity of the first end of cathode relay G2 Pressure and the absolute difference of the voltage of the second end of cathode relay G2 are more than preset power battery pack negative terminal relay to be measured When coil pressure drop, determine that the working condition of cathode relay G2 is malfunction.
Further, when control cathode relay G2 conductings, if UB-(inside)And UB-(outside)Meet above-mentioned formula (4) And UB-(outside)=0, it may be determined that cathode relay G2 breaks down and is off state.
In another embodiment, when control cathode relay G2 disconnections, if UB-(inside)And UB-(outside)In satisfaction State formula (3), it may be determined that cathode relay G2 breaks down and is adhesion state.
In this embodiment, when control cathode relay G2 disconnections, if UB-(inside)And UB-(outside)Meet above-mentioned public affairs Formula (10) and UB-(outside)=0, it may be determined that cathode relay G2 is normal condition.
In this embodiment, with voltage on the inside of the power battery pack anode relay to be measured that is obtained in high pressure sampling process, Voltage and preset positive relay coil pressure drop on the outside of power battery pack anode relay to be measured, to anode relay coil Working condition diagnosed;And voltage on the inside of the power battery pack negative terminal relay to be measured that is obtained in high pressure sampling process, Voltage and preset cathode relay coil pressure drop, the work to negative terminal relay coil on the outside of power battery pack negative terminal to be measured State is diagnosed.
It continues with reference to figure 7, and by specific embodiment detailed description according to the battery of one embodiment of the utility model Management system carries out power battery pack to be measured the method and steps of Insulation monitoring.
As shown in fig. 7, the battery management system includes the battery detection circuit in above-described embodiment, and examined with the battery The processor C1 of slowdown monitoring circuit connection.
Fig. 7 also schematically shows the positive insulation resistance value of power battery pack to be measured and negative insulation resistance value is examined in battery Position where in slowdown monitoring circuit figure.Wherein, RpFor the positive insulation resistance value of power battery pack, RnIt is exhausted for the cathode of power battery pack Edge resistance value.
As shown by a dashed line in fig 7, RpThe anode of one end and power battery pack to be measured connect, RpThe other end and reference Reference voltage terminal GND connections;RnOne end connect with reference data voltage end GND, RnThe other end and power battery pack to be measured Cathode connects.
In the figure 7, first switch device K1 and second switch device K2 can be closed at as first by processor C1 Switching device state, based on the first anode sampling letter acquired from the first positive sampled point S1 under the first switch device state Number, and from the first cathode sampled signal of the first cathode sampled point S2 acquisitions, be calculated under first switch device state and wait for Survey the positive terminal voltage U of power battery packp0With the negative terminal voltage U of power battery pack to be measured under first switch device staten0
First switch device K1 can be closed by processor C1 and second switch device K2 is disconnected and is used as second switch device The second switch device state is calculated based on the first positive sampled signal acquired under second switch device state in state Under power battery pack to be measured positive terminal voltage Up1
Processor C1 can disconnect first switch device and second switch device is closed and is used as third switching device state, Based on the first cathode sampled signal acquired under third switching device state, it is calculated to be measured dynamic under third switching device state The negative terminal voltage U of power battery packn2
Processor C1 can be based on the positive terminal voltage U of power battery pack to be measured under first switch device statep0, first switch The negative terminal voltage U of power battery pack to be measured under device staten0, under second switch device state power battery pack to be measured anode electricity Press Up1With the negative terminal voltage U of power battery pack to be measured under third switching device staten2, power battery pack to be measured is calculated Positive insulation resistance value and negative insulation resistance value.
First, when K1 is closed and K2 is closed, processor C1 can be based on the acquired under the first switch device state The sampled voltage U of one positive sampled signalmp0With the sampled voltage U of the first cathode sampled signalmn0, obtain such as following formula (5) Shown in equation:
In above-mentioned formula (5), Up0Indicate the positive terminal voltage of the power battery pack to be measured under first switch state, Un0Table Show the negative terminal voltage of the power battery pack to be measured under first switch state, R1Indicate the resistance value of first resistor network, R2Indicate second The resistance value of resistor network, R3Indicate the resistance value of 3rd resistor network, R4Indicate the resistance value of the 4th resistor network, RpIndicate to be measured dynamic The positive insulation resistance value of power battery pack, RnIndicate the negative insulation resistance value of power battery pack to be measured.
Then, when K1 is closed and K2 is disconnected, processor C1 can be based on first acquired under second switch device state The sampled voltage U of positive sampled signalmp1, obtain the equation as shown in following formula (5):
In above-mentioned formula (6), Up1Indicate the positive terminal voltage of the power battery pack to be measured under second switch state, Un1Table Show the negative terminal voltage of the power battery pack to be measured under second switch state, R1Indicate the resistance value of first resistor network, R2Indicate second The resistance value of resistor network, RpIndicate the positive insulation resistance value of power battery pack to be measured, RnIndicate that the cathode of power battery pack to be measured is exhausted Edge resistance value.
Then, when K1 is disconnected and K2 is closed, processor C1 can be based on the acquired under the third switching device state The sampled voltage U of one cathode sampled signalmn2, obtain the equation as shown in following formula (7):
In above-mentioned formula (7), Up2Indicate the positive terminal voltage of the power battery pack to be measured under third on off state, Un2Table Show the negative terminal voltage of the power battery pack to be measured under third on off state, R3Indicate the resistance value of 3rd resistor network, R4Indicate the 4th The resistance value of resistor network, RpIndicate the positive insulation resistance value of power battery pack to be measured, RnIndicate that the cathode of power battery pack to be measured is exhausted Edge resistance value.
By simultaneous above-mentioned formula (5), formula (6) and formula (7), the positive insulation resistance value of power battery pack to be measured is obtained RpWith negative insulation resistance value Rn
In some embodiments, work as R1=R4=Ra, R2=R3=Rb, wherein RaAnd RbFor preset resistance value when, to upper The equation for stating simultaneous formula (5), formula (6) and formula (7) is solved, and power to be measured shown in following formula (8) is obtained The positive insulation resistance value R of battery packpWith the negative insulation resistance value R of power battery pack to be measuredn
According to the positive insulation resistance value R obtained in above-mentioned formula (8)pWith the negative insulation resistance value R of power battery pack to be measuredn, It is compared respectively at corresponding preset standard threshold value, then can monitor the insulation resistance value between power battery pack positive and negative anodes in real time Whether standard is reached, so as to avoid the insulation resistance value between power battery pack positive and negative anodes from pacifying because of caused by not up to standard Full problem.
Fig. 8 is the structural schematic diagram for showing the battery management system according to another embodiment of the utility model, and Fig. 9 is to show According to the circuit diagram of the battery management system of another embodiment of the utility model.
With reference to Fig. 8 and Fig. 9, resistance net is often hung including first by specific embodiment simultaneously to battery detection circuit Network Rnet1Resistor network R is often hung with secondnet2When, the positive insulation resistance value R of power battery pack to be measuredpWith negative insulation resistance value Rn Calculating process be described in detail.
As shown in figure 8, in the utility model embodiment, battery management system include battery detection circuit and with the battery The processor C1 of detection circuit connection.
In some embodiments, it is found through experiments that, as positive insulation resistance value RpWith negative insulation resistance value RnDiffer larger When, the sampling precision of insulation detecting circuit is relatively low;As positive insulation resistance value RpWith negative insulation resistance value RnWhen difference is smaller, insulation The sampling precision of detection circuit is higher.
It may include the first normal extension electricity in order to improve sampling precision, in the battery detection circuit of the utility model embodiment Hinder network Rnet1Resistor network R is often hung with secondnet2At least one of.
As shown in figure 9, in fig.9, first, when K1 is closed and K2 is closed, processor C1 can be based on the first switch The sampled voltage U of the first positive sampled signal acquired under device statemp0With the sampled voltage U of the first cathode sampled signalmn0, Obtain the equation as shown in following formula (9):
In above-mentioned formula (9), Up0Indicate the positive terminal voltage of the power battery pack to be measured under first switch state, Un0Table Show the negative terminal voltage of the power battery pack to be measured under first switch state, R1Indicate the resistance value of first resistor network, R2Indicate second The resistance value of resistor network, R3Indicate the resistance value of 3rd resistor network, R4Indicate the resistance value of the 4th resistor network, RpIndicate to be measured dynamic The positive insulation resistance value of power battery pack, RnIndicate the negative insulation resistance value of power battery pack to be measured, Rnet1Indicate that first often hangs resistance The resistance value of network, Rnet2Indicate the second resistance value for often hanging resistor network, Rp//Rnet1Indicate that positive insulation resistance value and first often hangs electricity Hinder the resistance value after network parallel connection, Rn//Rnet2Indicate the resistance value after negative insulation resistance value is in parallel with the second normal extension resistor network.
Then, when K1 is closed and K2 is disconnected, processor C1 can be based on first acquired under second switch device state The sampled voltage U of positive sampled signalmp1, obtain the equation as shown in following formula (10):
In above-mentioned formula (10), Up1Indicate the positive terminal voltage of the power battery pack to be measured under second switch state, Ub1Table Show the negative terminal voltage of the power battery pack to be measured under second switch state, R1Indicate the resistance value of first resistor network, R2Indicate second The resistance value of resistor network, RpIndicate the positive insulation resistance value of power battery pack to be measured, RnIndicate that the cathode of power battery pack to be measured is exhausted Edge resistance value, Rnet1Indicate the first resistance value for often hanging resistor network, Rp//Rnet1Indicate that positive insulation resistance value and first often hangs resistance net Resistance value after network parallel connection, Rn//Rnet2Indicate the resistance value after negative insulation resistance value is in parallel with the second normal extension resistor network.
Then, when K1 is disconnected and K2 is closed, processor C1 can be based on the acquired under the third switching device state The sampled voltage U of one cathode sampled signalmn2, obtain the equation as shown in following formula (11):
In above-mentioned formula (11), Up2Indicate the positive terminal voltage of the power battery pack to be measured under third on off state, Un2Table Show the negative terminal voltage of the power battery pack to be measured under third on off state, R3Indicate the resistance value of 3rd resistor network, R4Indicate the 4th The resistance value of resistor network, RpIndicate the positive insulation resistance value of power battery pack to be measured, RnIndicate that the cathode of power battery pack to be measured is exhausted Edge resistance value, Rp//Rnet1Indicate the resistance value in parallel that positive insulation resistance value often hangs resistor network with first, Rn//Rnet2Indicate that cathode is exhausted The resistance value in parallel that edge resistance value often hangs resistor network with second.
By simultaneous above-mentioned formula (9), formula (10) and formula (11), the anode insulation resistance of power battery pack to be measured is obtained Value RpWith negative insulation resistance value Rn
In some embodiments, work as R1=R4=Ra, R2=R3=Rb, wherein RaAnd RbFor preset resistance value when, to upper The equation for stating simultaneous formula (5), formula (6) and formula (7) is solved, and power to be measured shown in following formula (12) is obtained The positive insulation resistance value R of battery packpWith the negative insulation resistance value R of power battery pack to be measuredn
In this embodiment, resistor network R is often hung by as described abovenet1Resistor network R is hung with normalnet2, can improve The sampling precision of insulation detecting circuit, and since resistance price is relatively low, Insulation monitoring can be promoted under the premise of reducing cost The cost performance of circuit.
According to the battery detection circuit and battery management system of the utility model embodiment, to the height of power battery pack to be measured Pressure sampling, Insulation monitoring and relay diagnosis are directed to integrated design, and combine the relevant configuration in battery management system, can be with Voltage on the outside of power battery group relay inside voltage to be measured and power battery group relay to be measured is accurately calculated, and diagnoses electricity Whether pond group positive and negative terminal relay breaks down and is detected to the insulation resistance value of power battery pack to be measured, solves high pressure The problem that sampling, Insulation monitoring and relay diagnosis are complicated caused by separately designing, cost is higher and precision is relatively low, from And simplify circuit structure, it reduces circuit cost and obtaining and more accurately samples and testing result.
It should be clear that the utility model is not limited to specific configuration described above and shown in figure and place Reason.For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, if having been described and illustrated Dry specific step is as example.But the procedure of the utility model is not limited to described and illustrated specific steps, Those skilled in the art can be variously modified, modification and addition after understanding the spirit of the utility model, or change Sequence between step.
Above description is only a specific implementation of the present invention, those skilled in the art can be clearly It solves, for convenience of description and succinctly, the system of foregoing description, the specific work process of module and unit, before can referring to The corresponding process in embodiment of the method is stated, details are not described herein.It should be understood that the scope of protection of the utility model is not limited to This, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in various etc. The modifications or substitutions of effect, these modifications or substitutions should be covered within the scope of the utility model.

Claims (5)

1. a kind of battery detection circuit, which is characterized in that the battery detection circuit include positive relay, cathode relay, First positive sampling module, the first cathode sampling module, the second positive sampling module, the second cathode sampling module, the first anode Sampled point, the first cathode sampled point, the second positive sampled point, the second cathode sampled point and reference data voltage end;Wherein,
The anode of power battery pack to be measured is connect with the first end of the positive relay, the cathode of the power battery pack to be measured It is connect with the first end of the cathode relay, the first positive sampling module, the first cathode sampling module, described the Two positive sampling modules, the second cathode sampling module are connect with the reference data voltage end;And wherein,
Described first positive sampling module is configured as acquiring the power battery pack to be measured of the first end of the positive relay First positive sampled signal, the described first positive sampling module are additionally configured to provide described the to the described first positive sampled point One positive sampled signal;
The first cathode sampling module is configured as acquiring the power battery pack to be measured of the first end of the cathode relay First cathode sampled signal, the first cathode sampling module are additionally configured to provide described the to the first cathode sampled point One cathode sampled signal;
Described second positive sampling module is configured as acquiring the power battery pack to be measured of the second end of the positive relay Second positive sampled signal, the described second positive sampling module are additionally configured to provide described the to the described second positive sampled point Two positive sampled signals;
The second cathode sampling module is configured as acquiring the power battery pack to be measured of the second end of the cathode relay Second cathode sampled signal, the second cathode sampling module are additionally configured to provide described the to the second cathode sampled point Two cathode sampled signals.
2. battery detection circuit according to claim 1, which is characterized in that
The first end of one end of the described first positive sampling module and the anode of power battery pack to be measured and the positive relay Connection, the other end and the described first positive sampled point and the reference data voltage end of the described first positive sampling module connect It connects;
The of the cathode of one end of the first cathode sampling module and the power battery pack to be measured and the cathode relay One end connects, the other end of the first cathode sampling module and the first cathode sampled point and the reference data voltage end Connection;
One end of described second positive sampling module is connect with the second end of the positive relay, the second anode sampling mould The other end of block is connect with the described second positive sampled point and the reference data voltage end;
One end of the second cathode sampling module is connect with the second end of the cathode relay, and second cathode samples mould The other end of block is connect with the second cathode sampled point.
3. battery detection circuit according to claim 1, which is characterized in that the battery detection circuit further includes first normal Resistor network is hung, described first, which often hangs the positive of first end and the power battery pack to be measured of resistor network, connect, and described the One second end for often hanging resistor network is connect with the reference data voltage end.
4. battery detection circuit according to claim 1, which is characterized in that the battery detection circuit further includes second normal Resistor network is hung, the described second first end for often hanging resistor network is connect with the cathode of the power battery pack to be measured, and described the Two second ends for often hanging resistor network are connect with the reference data voltage end.
5. a kind of battery management system, which is characterized in that including any battery detection circuit in claim 1-4.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020177639A1 (en) * 2019-03-01 2020-09-10 宁德时代新能源科技股份有限公司 Insulation detection circuit and detection method, and battery management system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020177639A1 (en) * 2019-03-01 2020-09-10 宁德时代新能源科技股份有限公司 Insulation detection circuit and detection method, and battery management system

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