CN107727923A - High-voltage sampling circuit and battery management system - Google Patents
High-voltage sampling circuit and battery management system Download PDFInfo
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- CN107727923A CN107727923A CN201710757182.0A CN201710757182A CN107727923A CN 107727923 A CN107727923 A CN 107727923A CN 201710757182 A CN201710757182 A CN 201710757182A CN 107727923 A CN107727923 A CN 107727923A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention provides a high-voltage sampling circuit and a battery management system, and relates to the field of batteries. The high-voltage sampling circuit comprises a reference voltage terminal, an anode sampling module, a cathode sampling module and a voltage pull-up module. The voltage pull-up module can generate a pull-up voltage, so that the sampling signal of the positive sampling module and the sampling signal of the negative sampling module are pulled up to be positive voltage signals by the pull-up voltage. The high-voltage sampling circuit provided by the invention can reduce the complexity of the structure of a system where the high-voltage sampling circuit is located.
Description
Technical field
The present invention relates to field of batteries, more particularly to a kind of high pressure sample circuit and battery management system.
Background technology
Electrokinetic cell is responsible for storing and providing electric energy, such as, HVDC is exported to drive electrical equipment.It is dynamic in order to monitor
The high pressure conditions of power battery, high pressure sample circuit is set for electrokinetic cell, gathers high tension loop positive terminal sampled signal and high pressure
Loop negative pole end sampled signal.By the high tension loop positive terminal sampled signal and high tension loop negative pole end sampling letter that monitor collection
Number, monitor the high pressure conditions of electrokinetic cell.
At present, in high pressure sample circuit, by the high tension loop positive terminal or high tension loop negative pole end of high pressure sample circuit
Reference data end as sampling.Sampling A/D chip is used as the reference base of sampling using high tension loop positive terminal or high tension loop negative pole end
Quasi- end, the voltage signal collected is it is possible that negative value.If negative value occurs in the voltage signal collected, in order to handle
The voltage signal of negative value, the circuit of the voltage signal of subsequent treatment collection do not need only to have can handle on the occasion of voltage signal
Structure, it is also necessary to which there is the structure for the voltage signal that can handle negative value.So as to add the knot of high pressure sample circuit place system
The complexity of structure.
The content of the invention
The embodiments of the invention provide a kind of high pressure sample circuit and battery management system, high pressure sample circuit can be reduced
The complexity of the structure of place system.
In a first aspect, the embodiments of the invention provide a kind of high pressure sample circuit, including positive switch module, negative switch
It is module, the first positive pole sampling module, the first negative pole sampling module, first voltage pull-up module, the first positive pole sampled point, first negative
Pole sampled point and reference data voltage end；Wherein, the positive pole of the first end of positive switch module and power battery pack to be measured and
First positive pole sampling module connects；The first end of negative switch module connects the negative pole of power battery pack to be measured and the first negative pole is adopted
Egf block；First positive pole sampling module is connected with reference data voltage end and the first positive pole sampled point, the first positive pole sampling module
It is configured as providing the first positive pole sampled signal to the first positive pole sampled point；First negative pole sampling module and reference data voltage end
Connected with the first negative pole sampled point, the first negative pole sampling module is configured as providing the sampling of the first negative pole to the first negative pole sampled point
Signal；First voltage pull-up module is connected with the first positive pole sampled point, the first negative pole sampled point and reference data voltage end, and first
Voltage pull-up module is configurable to generate pull-up voltage, is sampled the first positive pole sampled signal and the first negative pole using upper pull-up voltage
Signal pull-up is positive voltage signal.
Second aspect, the embodiment of the present invention additionally provide a kind of battery management system, including above-mentioned high pressure sample circuit, electricity
Pond management system also includes the processor being connected with high pressure sample circuit, and processor is configured as：Sampled and believed based on the first positive pole
Number and the first negative pole sampled signal, the voltage of the first end of positive switch module and the first end of negative switch module is calculated
Voltage；According to the voltage of the first end of positive switch module and the voltage of the first end of negative switch module, power electric is obtained
The high tension loop voltage in pond.
The embodiments of the invention provide a kind of high pressure sample circuit and battery management system.High pressure sample circuit includes positive pole
Switch module, negative switch module, the first positive pole sampling module, the first negative pole sampling module and first voltage pull-up module.The
One voltage pull-up module can provide pull-up voltage., can be by gathered from the first positive pole sampled point first just using upper pull-up voltage
Pole sampled signal, the first negative pole sampled signal pull-up gathered from the first negative pole sampled point are positive voltage signal.With prior art
In not only need configuration can handle on the occasion of voltage signal structure, it is also necessary to configuration can handle negative value voltage signal structure
High pressure sample circuit compare, because the sampled signal collected in the embodiment of the present invention is positive voltage signal, therefore be not required to
Configure the structure for the voltage signal that can handle negative value.So as to simplify the structure of the system where high pressure sample circuit.
Brief description of the drawings
The present invention may be better understood wherein from the description to the embodiment of the present invention below in conjunction with the accompanying drawings,
Same or analogous reference represents same or analogous feature.
Fig. 1 is the structural representation of one embodiment of the invention mesohigh sample circuit；
Fig. 2 is the structural representation of an example mesohigh sample circuit of one embodiment of the invention；
Fig. 3 is the structural representation of another embodiment of the present invention mesohigh sample circuit；
Fig. 4 is the structural representation of an example mesohigh sample circuit of another embodiment of the present invention；
Fig. 5 is the structural representation of further embodiment of this invention mesohigh sample circuit；
Fig. 6 is the structural representation of battery management system in one embodiment of the invention；
Fig. 7 is the structural representation of battery management system in another embodiment of the present invention.
Embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is used for the purpose of by showing that the example of the present invention is better understood to provide to the present invention.The present invention never limits
In any concrete configuration set forth below, but element and part are covered under the premise of without departing from the spirit of the present invention
Any modification, replace and improve.In the the accompanying drawings and the following description, known structure and technology is not shown, to avoid pair
The present invention causes unnecessary obscure.
The embodiments of the invention provide a kind of high pressure sample circuit and battery management system.The high pressure sample circuit can be right
The high tension loop sampling of power battery pack to be measured, so as to which the high tension loop state to power battery pack to be measured is monitored.Need
Illustrate, the power battery pack to be measured in the embodiment of the present invention 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, are not limited herein.For scale,
Power battery pack to be measured can also be battery core monomer or battery modules or battery bag, not limit herein.Battery management
System includes above-mentioned high pressure sample circuit, and battery management system can get the sampling letter collected in high pressure sample circuit
Number, so as to judge the high tension loop state of power battery pack to be measured according to sampled signal.Can also be in high pressure sample circuit
The state of positive switch module and the state of negative switch module are monitored.
Fig. 1 is the structural representation of one embodiment of the invention mesohigh sample circuit.As shown in figure 1, high pressure sample circuit
Including positive switch module G1, negative switch module G2, the first positive pole sampling module F1, the first negative pole sampling module F2, first
Voltage pull-up module F3, the first positive pole sampled point S1, the first negative pole sampled point S2 and reference data voltage end HV_GND.
Wherein, positive switch module G1 first end P1 and the positive pole of power battery pack to be measured and the first positive pole sampling module
F1 connections.
The negative pole and the first negative pole sampling module F2 of negative switch module G2 first end N1 connections power battery pack to be measured.
Positive switch module G1 and negative switch module G2 can be configured as controlling the break-make of the output of electrokinetic cell.
First positive pole sampling module F1 is connected with reference data voltage end HV_GND and the first positive pole sampled point S1, and first just
Pole sampling module F1 is configured as providing the first positive pole sampled signal to the first positive pole sampled point S1.
First negative pole sampling module F2 is connected with reference data voltage end HV_GND and the first negative pole sampled point S2, and first is negative
Pole sampling module F2 is configured as providing the first negative pole sampled signal to the first negative pole sampled point S2.
First voltage pulls up module F3 and the first positive pole sampled point S1, the first negative pole sampled point S2 and reference data voltage end
HV_GND connections, first voltage pull-up module F3 are configurable to generate pull-up voltage, are sampled the first positive pole using upper pull-up voltage
Signal and the first negative pole sampled signal pull-up are positive voltage signal.In one example, first voltage pull-up module F3 negative pole
It is connected with reference data voltage end HV_GND, so that upper pull-up voltage is higher than reference data voltage end HV_GND voltage.
It should be noted that reference data voltage end HV_GND virtual voltage can be according to the work of high pressure sample circuit
Scene and demand are set.But reference data voltage end HV_GND voltage in high pressure sample circuit on the basis of voltage,
Reference data voltage end HV_GND reference voltage can be regarded as relative 0V.Such as if reference data voltage end HV_GND
Virtual voltage be 6V, the virtual voltage for the sampled signal that the first positive pole sampled point S1 is collected is 22V, then can be by reference voltage
6V is designated as 0V, and the voltage of the first positive pole sampled point S1 sampled signals collected is designated as into 16V.
In one example, reference data voltage end is adopted independently of the high tension loop positive terminal and high pressure of high pressure sample circuit
The high tension loop negative pole end of sample circuit.As shown in figure 1, high tension loop positive terminal can be with positive switch module G1 the second end P2
Overlap, high tension loop negative pole end can overlap with negative switch module G2 the second end N2.Reference data voltage end is one only
It vertical voltage end, can't be disturbed by other voltage ends, avoid other voltage ends and reference data voltage end is caused to do
The problem of sampling precision caused by disturbing declines, so as to ensure that the accurate of the first positive pole sampled signal and the first negative pole sampled signal
Degree.
If there is no first voltage to pull up module F3 in high pressure sample circuit, due to the pressure drop of electric current, the sampling of the first negative pole
The voltage of point S2 the first negative pole sampled signal may be (i.e. relative less than reference data voltage end HV_GND voltage
0V).That is, the voltage of the first positive pole sampled point S1 the first positive pole sampled signal, the first of the first negative pole sampled point S2
The voltage of negative pole sampled signal may be designated as negative value.
In embodiments of the present invention, the upper pull-up voltage of first voltage pull-up module F3 generations is higher than reference data voltage end
Voltage.That is, the upper pull-up voltage of first voltage pull-up module F3 generation be on the occasion of.So as to utilize upper pull-up voltage, by first
The electricity of the voltage of positive pole sampled point S1 the first positive pole sampled signal and the first negative pole sampled point S2 the first negative pole sampled signal
Pressure pull-up so that the voltage of the first positive pole sampled point S1 the first positive pole sampled signal, the first of the first negative pole sampled point S2 negative
The voltage of pole sampled signal is higher than the voltage of reference data voltage end.That is, the first positive pole sampled point S1 the first positive pole
The voltage of the voltage of sampled signal and the first negative pole sampled point S2 the first negative pole sampled signal be designated as on the occasion of.
It can utilize from the first positive pole sampled signal of the first positive pole sampled point S1 collections and from the first negative pole sampled point S2
First negative pole sampled signal of collection, by calculating, the high tension loop voltage of power battery pack to be measured is obtained, is treated so as to realize
Survey the monitoring of the high pressure conditions of power battery pack.
The embodiments of the invention provide a kind of high pressure sample circuit.High pressure sample circuit includes positive switch module G1, born
Pole switch module G2, the first positive pole sampling module F1, the first negative pole sampling module F2 and first voltage pull-up module F3.First electricity
Pressure pull-up module F3 can provide pull-up voltage., can be by gathered from the first positive pole sampled point S1 first just using upper pull-up voltage
Pole sampled signal and the first negative pole sampled signal pull-up gathered from the first negative pole sampled point S2 are positive voltage signal.With existing skill
In art not only need configuration can handle on the occasion of voltage signal structure, it is also necessary to configuration can handle negative value voltage signal knot
The high pressure sample circuit of structure is compared, because the sampled signal collected in the embodiment of the present invention is positive voltage signal, therefore not
Configuration is needed to handle the structure of voltage signal of negative value.So as to simplify the structure of the system where high pressure sample circuit.
Fig. 2 is the structural representation of an example mesohigh sample circuit of one embodiment of the invention.As shown in Fig. 2 first
Positive pole sampling module F1, the first negative pole sampling module F2 and first voltage pull-up module F3 can be made up of component.Below
The first positive pole sampling module F1, the first negative pole sampling module F2 and first voltage pull-up module F3 specific knot will be illustrated
Structure.
In one example, positive switch module G1 includes positive pole relay Relay_pos, and negative switch module G2 includes
Negative pole relay Relay_neg.It can also regard as, positive switch module G1 is positive pole relay Relay_pos, negative switch mould
Block G2 is negative pole relay Relay_neg.
First positive pole sampling module F1 includes the first resistor network R1 and second resistance network R2 of series connection.Wherein, first
Resistor network R1 one end is connected with the positive pole of power battery pack to be measured and positive pole relay Relay_pos first end P1, the
The one resistor network R1 other end is connected with second resistance network R2 one end and the first positive pole sampled point S1.Second resistance network
The R2 other end is connected with reference data voltage end HV_GND.
First resistor network R1 and second resistance network R2 plays partial pressure effect.Can by adjust first resistor network R1 and
Second resistance network R2 resistance size, adjust the excursion of the first positive pole sampled point S1 the first positive pole sampled signal.
First negative pole sampling module F2 includes the 3rd resistor network R3 and the 4th resistor network R4 of series connection.Wherein, the 3rd
Resistor network R3 one end is connected with reference data voltage end HV_GND, 3rd resistor network the R3 other end and the 4th resistance net
Network R4 one end connects with the first negative pole sampled point S2.The 4th resistor network R4 other end and the negative pole of power battery pack to be measured
Connected with negative pole relay Relay_neg first end N1.
3rd resistor network R3 and the 4th resistor network R4 plays partial pressure effect.Can by adjust 3rd resistor network R3 and
4th resistor network R4 resistance size, adjust the excursion of the first negative pole sampled point S2 the first negative pole sampled signal.
First voltage pull-up module F3 includes the first power supply V1, and the 5th resistor network R5 and the 6th resistance net of series connection
Network R6.5th resistor network R5 one end is connected with the first positive pole sampled point S1, the 5th resistor network R5 other end and first
Power supply V1 positive pole and the 6th resistor network R6 one end connect.The 6th resistor network R6 other end and the first negative pole sampled point
S2 connections.First power supply V1 negative pole is connected with reference data voltage end HV_GND.
In one example, the 5th resistor network R5 resistance combining form and the big I of resistance and the 6th resistor network
R6 resistance combining form and resistance size is identical.
Fig. 3 is the structural representation of another embodiment of the present invention mesohigh sample circuit.Fig. 3 and Fig. 1 difference exists
In high pressure sample circuit may also include the second positive pole sampling module F4, the second negative pole sampling module F5, second voltage pull-up module
F6, the second positive pole sampled point S3 and the second negative pole sampled point S4.
Second positive pole sampling module F4 and positive switch module G1 the second end P2, reference data voltage end HV_GND and the
Two positive pole sampled point S3 connections, the second positive pole sampling module F4 are configured as adopting to the second positive pole sampled point S3 the second positive poles of offer
Sample signal.
Second negative pole sampling module F5 and negative switch module G2 the second end N2, reference data voltage end HV_GND and the
Two negative pole sampled point S4 connections, the second negative pole sampling module F5 are configured as adopting to the second negative pole sampled point S4 the second negative poles of offer
Sample signal.
Second voltage pulls up module F6 and the second positive pole sampled point S3, the second negative pole sampled point S4 and reference data voltage end
HV_GND connections, second voltage pull-up module F6 are configurable to generate pull-up voltage, are sampled the second positive pole using upper pull-up voltage
Signal and the second negative pole sampled signal pull-up are positive voltage signal.
The embodiment of the present invention can utilize the first positive pole sampled signal, negative from first from the first positive pole sampled point S1 collections
Pole sampled point S2 collection the first negative pole sampled signal, from the second positive pole sampled point S3 collection the second positive pole sampled signal and from
Second negative pole sampled signal of the second negative pole sampled point S4 collections, by calculating, obtains the voltage of positive switch module G1 both sides
With the voltage of negative switch module G2 both sides, so as to realize the shape of state and negative switch module G1 to positive pole switch module G1
The monitoring of state.
It should be noted that reference data voltage end is an independent voltage end, can't be by other voltage ends
Interference, avoid reference data voltage end and receive the problem of sampling precision declines caused by interference, so as to ensure that the first positive pole
Sampled signal, the first negative pole sampled signal, the accuracy of the second positive pole sampled signal and the second negative pole sampled signal.
Fig. 4 is the structural representation of an example mesohigh sample circuit of another embodiment of the present invention.As shown in figure 4, the
Two positive pole sampling module F4, the second negative pole sampling module F5 and second voltage pull-up module F6 can be made up of component.Under
Face pulls up module F6 specific knot by the second positive pole sampling module F4, the second negative pole sampling module F5 and second voltage is illustrated
Structure.
In one example, positive switch module G1 includes positive pole relay Relay_pos, and negative switch module G2 includes
Negative pole relay Relay_neg.It can also regard as, positive switch module G1 is positive pole relay Relay_pos, negative switch mould
Block G2 is negative pole relay Relay_neg.
Second positive pole sampling module F4 includes the 7th resistor network R7 and the 8th resistor network R8 of series connection.Wherein, the 7th
Resistor network R7 one end connects with positive pole relay Relay_pos the second end P2 (i.e. positive switch module G1 the second end)
Connect, the 7th resistor network R7 other end is connected with the 8th resistor network R8 one end and the second positive pole sampled point S3.8th electricity
The resistance network R8 other end is connected with reference data voltage end HV_GND.
7th resistor network R7 and the 8th resistor network R8 plays partial pressure effect.Can by adjust the 7th resistor network R7 and
8th resistor network R8 resistance size, adjust the excursion of the second positive pole sampled point S3 the second positive pole sampled signal.
Second negative pole sampling module F5 includes the 9th resistor network R9 and the tenth resistor network R10 of series connection.Wherein, the 9th
Resistor network R9 one end is connected with reference data voltage end HV_GND, the 9th resistor network the R9 other end and the tenth resistance net
Network R10 one end connects with the second negative pole sampled point S4.The tenth resistor network R10 other end and negative pole relay Relay_
Neg the second end N2 (i.e. in Fig. 1) connections.
9th resistor network R9 and the tenth resistor network R10 plays partial pressure effect.Can be by adjusting the 9th resistor network R9
With the tenth resistor network R10 resistance size, the excursion of the second negative pole sampled point S4 of adjustment the second negative pole sampled signal.
Second voltage pull-up module F6 includes second source V2, and the 11st resistor network R11 and the 12nd of series connection
Resistor network R12.11st resistor network R11 one end is connected with the second positive pole sampled point S3, the 11st resistor network R11's
The other end is connected with second source V2 positive pole and the 12nd resistor network R12 one end.12nd resistor network R12's is another
End is connected with the second negative pole sampled point S4.Second source V2 negative pole is connected with reference data voltage end HV_GND.
In one example, the 11st resistor network R11 resistance combining form and the big I of resistance and the 12nd electricity
Resistance combining form and the resistance size for hindering network R12 are identical.
The first above-mentioned power supply V1 and second source V2 can produce pull-up voltage U0, and upper pull-up voltage U0 is more than reference
Reference voltage terminal HV_GND voltage.
It should be noted that above-mentioned first resistor network R1 to the 12nd resistor network R12 each may each comprise one
Resistance, it may also comprise more than two resistance of series connection and/or parallel connection.In the high pressure sample circuit shown in Fig. 2, first resistor
Network R1 each includes a resistance to 12 resistance groups.
In one example, first resistor network R1 to the 12nd resistor network R12 resistance combining form and resistance
Size can adopt according to the first positive pole sampled point S1, the first negative pole sampled point S2, the second positive pole sampled point S3 and the second negative pole
Sample range and precision that sampling point S4 is sampled determines.And it is not limited to this.
In another example, resistance combining forms and resistance of the first resistor network R1 to the 12nd resistor network R12
Being worth size can be according in the first positive pole sampled point S1, the first negative pole sampled point S2, the second positive pole sampled point S3 and the second negative pole
The normal acquisition allowed band of the sampling module that sampled point S4 is sampled determines.And it is not limited to this.
In another example, resistance combining forms and resistance of the first resistor network R1 to the 12nd resistor network R12
Value size can also determine according to the normal working voltage tolerance range of the component in high pressure sample circuit.And do not limit
In this.
In a schematic example, first resistor network R1, the 4th resistor network R4, the 7th resistor network R7 and the tenth
The resistor network R10 big I of resistance combining form and resistance is identical.Second resistance network R2,3rd resistor network R3,
Eight resistor network R8 and the 9th resistor network R9 resistance combining form and the big I of resistance is identical.
Above-mentioned first positive pole sampled point S1, the first negative pole sampled point S2, the second positive pole sampled point S3 and the sampling of the second negative pole
Point S4 can be connected with the sampling module for sampling.In one example, sampling module can be that can realize sampling functions
Component, for example sampling module can be ADC (Analog-to-Digital Converter, analog-digital converter).
According to the voltage of the first positive pole sampled signal, the voltage of the first negative pole sampled signal, the second positive pole sampled signal
The voltage of voltage and the second negative pole sampled signal, the electricity of node P1, P2, N1 and N2 as shown in Figures 1 and 2 can be obtained
Pressure.Positive pole relay Relay_pos and negative pole relay Relay_neg can be obtained according to node P1, P2, N1 and N2 voltage
High tension loop on the outside of the voltage of the high tension loop of inner side, positive pole relay Relay_pos and negative pole relay Relay_neg
The voltage of voltage, positive pole relay Relay_pos voltage and negative pole relay Relay_neg.
Fig. 5 is the structural representation of further embodiment of this invention mesohigh sample circuit.As shown in figure 5, shown in Fig. 4
On the basis of high pressure sample circuit, the also settable first switch device K1 in the first positive pole sampling module F1, in the first negative pole
Also settable second switch device K2 in sampling module F2, also settable 3rd switching device in the second positive pole sampling module F4
K3, the also settable 4th switching device K4 in the second negative pole sampling module F5.
Wherein, first resistor network R1 one end is connected by first switch device K1 and the positive pole of power battery pack to be measured
Connect.The 4th resistor network R4 other end is connected by second switch device K2 with the negative pole of power battery pack to be measured.Second just
Pole sampling module F4 also includes the 3rd switching device K3, and the 7th resistor network R7 one end passes through the 3rd switching device K3 and positive pole
Relay Relay_pos the second end P2 connections.Second negative pole sampling module F5 also includes the 4th switching device K4, the tenth resistance
The network R10 other end is connected by the 4th switching device K4 with negative pole relay Relay_neg the second end N2.
First switch device K1 controls whether the first positive pole sampled point S1 can provide sampled signal.When first switch device
When K1 is in closure state, the first positive pole sampled point S1 can provide the first positive pole sampled signal.At first switch device K1
When off-state, the first positive pole sampled point S1 stops providing the first positive pole sampled signal.
Second switch device K2 controls whether the first negative pole sampled point S2 can provide sampled signal.When second switch device
When K2 is in closure state, the first negative pole sampled point S2 can provide the first negative pole sampled signal.At second switch device K2
When off-state, the first negative pole sampled point S2 stops providing the first negative pole sampled signal.
3rd switching device K3 controls whether the second positive pole sampled point S3 can provide sampled signal.When the 3rd switching device
When K3 is in closure state, the second positive pole sampled point S3 can provide the second positive pole sampled signal.At the 3rd switching device K3
When off-state, the second positive pole sampled point S3 stops providing the second positive pole sampled signal.
4th switching device K4 controls whether the second negative pole sampled point S4 can provide sampled signal.When the 4th switching device
When K4 is in closure state, the second negative pole sampled point S4 can provide the second negative pole sampled signal.At the 4th switching device K4
When off-state, the second negative pole sampled point S4 stops providing the second negative pole sampled signal.
It should be noted that can be according to specific operative scenario and work requirements, it is determined whether above-mentioned first is set
Switching device K1, second switch device K2, the 3rd switching device K3 and the 4th switching device K4.In one example, can also
First switch device K1, second switch device K2, the 3rd switching device K3 and the 4th derailing switch are set in high pressure sample circuit
Switching device more than any one in part K4.Wherein, switching device includes the component that on-off action can be achieved, herein simultaneously
Do not limit.For example switching device can be the mechanical switch such as single-pole single-throw switch (SPST), or triode, metal-oxide-semiconductor (metal-oxygen
Compound-semiconductor field effect transistor) etc. electronic switch.
Fig. 6 is the structural representation of battery management system in one embodiment of the invention.As shown in fig. 6, the battery management system
System includes the high pressure sample circuit in above-described embodiment, and the processor 10 being connected with high pressure sample circuit.Processor 10 can
The the first positive pole sampled signal and the first negative pole sampled signal obtained with basis from high pressure sample circuit, to the high pressure of electrokinetic cell
The state in loop is monitored.
In one example, processor 10 can sample with the first positive pole sampled point S1 of high pressure sample circuit and the first negative pole
Point S2 connections.Processor 10 can be configured as, based on the first positive pole sampled signal, the first negative pole sampled signal, positive pole being calculated
The voltage of the voltage of switch module G1 first end and negative switch module G2 first end；According to the of positive switch module G1
The voltage of the voltage of one end and negative switch module G2 first end, obtains the high tension loop voltage of electrokinetic cell.
High pressure sample circuit in battery management system is by taking the high pressure sample circuit shown in Fig. 2 as an example, battery management system
First that the voltage Us1 and the first negative pole sampled point S2 of the first positive pole sampled point S1 the first positive pole sampled signal can be obtained is negative
The voltage Us2 of pole sampled signal.Using formula below (1) and formula (2), positive switch module G1 first end can be obtained
P1 voltage Up1, and negative switch module G2 first end N1 voltage Un1.
Assuming that first resistor network R1 resistance and the 4th resistor network R4 resistance in high pressure sample circuit shown in Fig. 2
Value is Ra.Second resistance network R2 resistance and 3rd resistor network R3 resistance are Rb.5th resistor network R5 resistance
Value and the 6th resistor network R6 resistance are Rc.Upper pull-up voltage is U0.Then formula (1) and formula (2) are as follows：
The Up1 and Un1 difference being calculated are the voltage of the high tension loop of electrokinetic cell.
In embodiments of the present invention, the processor 10 in battery management system can utilize the first positive pole collected to adopt
Sample signal and the first negative pole sampled signal, by calculating, obtain the high tension loop voltage of electrokinetic cell.So as to utilize power
The state of high tension loop of the high tension loop voltage of battery to electrokinetic cell is monitored.
Fig. 7 is the structural representation of battery management system in another embodiment of the present invention.In a schematic example, such as
Shown in Fig. 7, processor 10 can be connected with the first positive pole sampled point S1 and the first negative pole sampled point S2 of high pressure sample circuit, may be used also
It is connected with the second positive pole sampled point S3 with high pressure sample circuit and the second negative pole sampled point S4.
In one example, processor 10 is also configured to based on the second positive pole sampled signal and the second negative pole sampling letter
Number, the voltage at positive switch module G1 the second end and the voltage at negative switch module G2 the second end is calculated.So as to root
According to the voltage and the negative switch module G2 voltage of first end of positive switch module G1 first end, positive switch module G1
The voltage at the second end and the voltage at negative switch module G2 the second end, obtain positive switch module G1 voltage and negative switch
Module G2 voltage.
High pressure sample circuit in battery management system is by taking the high pressure sample circuit shown in Fig. 4 as an example, battery management system
The voltage Us1, the first of the first negative pole sampled point S2 negative of the first positive pole sampled point S1 the first positive pole sampled signal can be obtained
The voltage Us2 of pole sampled signal, the second positive pole sampled point S3 the second positive pole sampled signal voltage Us3 and the second negative pole sampling
The voltage Us4 of point S4 the second negative pole sampled signal.Utilize above formula (1) and formula (2), and formula below (3)
With formula (4), positive switch module G1 first end P1 voltage Up1, positive switch module G2 the second end P2 can be obtained
Voltage Up2, negative switch module G2 first end N1 voltage Un1 and negative switch module G2 the second end N2 voltage
Un2。
Assuming that the resistance of the resistance, the 4th resistor network R4 of first resistor network R1 in high pressure sample circuit shown in Fig. 4
The resistance of value, the 7th resistor network R7 resistance and the tenth resistor network R10 is Ra.Second resistance network R2 resistance,
Three resistor network R3 resistance, the 8th resistor network R8 resistance and the 9th resistor network R9 resistance is Rb.5th resistance
Network R5 resistance, the 6th resistor network R6 resistance, the 11st resistor network R11 resistance and the 12nd resistor network R12
Resistance be Rc.Upper pull-up voltage is U0.Then formula (3) and formula (4) are as follows：
The Up1 and Up2 difference being calculated are positive switch module Relay_pos voltage.The Un1 that is calculated with
Un2 difference is negative switch module Relay_neg voltage.
In embodiments of the present invention, the processor 10 in battery management system can utilize the first positive pole collected to adopt
Sample signal, the first negative pole sampled signal, the second positive pole sampled signal and the second negative pole sampled signal, by calculating, obtain positive pole
Switch module G1 voltage and negative switch module G2 voltage.So as to utilize positive switch module G1 voltage to positive pole
Switch module G1 state is monitored, and negative switch module G2 state is entered using negative switch module G2 voltage
Row monitoring.
In another inventive embodiments, the processor 10 in battery management system can also contrast positive switch module G1
Voltage and default positive pole state threshold voltage, obtain positive switch module comparing result.Contrasted according to positive switch module
As a result, positive switch module G1 state is obtained.
Wherein, positive switch module G1 state includes closure state, off-state and can be by closure state and disconnection
Malfunction that state is extended, normal operating conditions etc..For example positive switch module G1 voltage is Up1-Up2, positive pole shape
State threshold voltage is Uth1, if Up1-Up2 >=Uth1, positive switch module G1 is off.If Up1-Up2 ＜ Uth1,
Positive switch module G1 is in closure state.
Positive pole state threshold voltage can be set according to work requirements, operative scenario or empirical value, and establishing method is herein simultaneously
Do not limit.
If the positive switch module G1's that current demand positive switch module G1 folding condition obtains with processor 10 opens
Conjunction state is not inconsistent, then positive switch module G1 is in malfunction.For example current demand positive switch module G1 is in and disconnects shape
State, but the positive switch module G1 state that the processor 10 of battery management system obtains is closure state, then may further determine that just
Pole switch module G1 is in malfunction.Similarly, if current demand positive switch module G1 is in closure state, but battery management
The state for the positive switch module G1 that the processor 10 of system obtains is off-state, then may further determine that at positive switch module G1
In malfunction.
If the positive switch module G1's that current demand positive switch module G1 folding condition obtains with processor 10 opens
Conjunction state is consistent, then positive switch module G1 is in normal operating conditions.For example current demand positive switch module G1 is in disconnected
Open state, but the positive switch module G1 state that the processor 10 of battery management system obtains is off-state, then can also be true
Determine positive switch module G1 and be in normal operating conditions.Similarly, if current demand positive switch module G1 is in closure state, but
The state for the positive switch module G1 that the processor 10 of battery management system obtains is closure state, then may further determine that positive switch
Module G1 is in normal operating conditions.
In another inventive embodiments, the processor 10 in battery management system can also contrast negative switch module G2
Voltage and default negative pole state threshold voltage, obtain negative switch module comparing result.Contrasted according to negative switch module
As a result, negative switch module G2 state is obtained.
Wherein, negative switch module G2 state includes closure state, off-state and can be by closure state and disconnection
Malfunction that state is extended, normal operating conditions etc..For example negative switch module G2 voltage is Un1+Un2, negative pole shape
State threshold voltage is Uth2, if Un1-Un2 >=Uth2, negative switch module G2 is off.If Un1-Un2 ＜ Uth2,
Negative switch module G2 is in closure state.
Negative pole state threshold voltage can be set according to work requirements, operative scenario or empirical value, and establishing method is herein simultaneously
Do not limit.
If the negative switch module G2's that current demand negative switch module G2 folding condition obtains with processor 10 opens
Conjunction state is not inconsistent, then negative switch module G2 is in malfunction.
If the negative switch module G2's that current demand negative switch module G2 folding condition obtains with processor 10 opens
Conjunction state is consistent, then negative switch module G2 is in normal operating conditions.
In embodiments of the present invention, battery management system can be to positive pole switch module G1 state and negative switch module
G2 state is monitored, consequently facilitating after being taken according to the state of positive switch module G1 state and negative switch module G2
Continuous measure.
Feature, structure or characteristic described in above-described embodiment can be incorporated in one or more in any suitable manner
In more embodiments.In the following description, there is provided many details fully understand so as to provide to embodiments of the invention.
It will be appreciated, however, by one skilled in the art that can put into practice technical scheme without one in specific detail or
More, or can be using other components etc..In other cases, it is not shown in detail or describes known features, material etc.
To avoid obscuring the major technique intention of the present invention.
Claims (19)
1. a kind of high pressure sample circuit, it is characterised in that including positive switch module, negative switch module, the sampling of the first positive pole
Module, the first negative pole sampling module, first voltage pull-up module, the first positive pole sampled point, the first negative pole sampled point and reference
Reference voltage terminal；
Wherein, the first end of the positive switch module and the positive pole of power battery pack to be measured and the first positive pole sampling module
Connection；
The first end of the negative switch module connects the negative pole and first negative pole sampling mould of the power battery pack to be measured
Block；
The first positive pole sampling module is connected with the reference data voltage end and the first positive pole sampled point, and described first
Positive pole sampling module is configured as providing the first positive pole sampled signal to the first positive pole sampled point；
The first negative pole sampling module is connected with the reference data voltage end and the first negative pole sampled point, and described first
Negative pole sampling module is configured as providing the first negative pole sampled signal to the first negative pole sampled point；
The first voltage pull-up module and the first positive pole sampled point, the first negative pole sampled point and the reference data
Voltage end connects, and first voltage pull-up module is configurable to generate pull-up voltage, using the upper pull-up voltage by described the
One positive pole sampled signal and the first negative pole sampled signal pull-up are positive voltage signal.
2. high pressure sample circuit according to claim 1, it is characterised in that the first positive pole sampling module includes series connection
First resistor network and second resistance network；
Wherein, the positive pole of one end of the first resistor network and the power battery pack to be measured and the positive switch module
First end connects, and the other end of the first resistor network samples with one end of the second resistance network and first positive pole
Point connection；
The other end of the second resistance network is connected with the reference data voltage end.
3. high pressure sample circuit according to claim 1, it is characterised in that the first negative pole sampling module includes series connection
3rd resistor network and the 4th resistor network；
Wherein, one end of the 3rd resistor network is connected with the reference data voltage end, the 3rd resistor network it is another
One end is connected with one end of the 4th resistor network and the first negative pole sampled point；
The of the other end of 4th resistor network and the negative pole of the power battery pack to be measured and the negative switch module
One end connects.
4. high pressure sample circuit according to claim 1, it is characterised in that the first voltage pull-up module includes first
Power supply, and the 5th resistor network and the 6th resistor network of series connection；
One end of 5th resistor network is connected with the first positive pole sampled point, the other end of the 5th resistor network with
The positive pole of first power supply is connected with one end of the 6th resistor network；
The other end of 6th resistor network is connected with the first negative pole sampled point；
The negative pole of first power supply is connected with the reference data voltage end.
5. high pressure sample circuit according to claim 1, it is characterised in that the high pressure sample circuit is also including second just
Pole sampling module, the second negative pole sampling module, second voltage pull-up module, the second positive pole sampled point and the second negative pole sampled point；
Wherein, the second end of the second positive pole sampling module and the positive switch module, the reference data voltage end and
The second positive pole sampled point connection, the second positive pole sampling module are configured as providing second just to the second positive pole sampled point
Pole sampled signal；
Second end of the second negative pole sampling module and the negative switch module, the reference data voltage end and described the
Two negative pole sampled points connect, and the second negative pole sampling module is configured as providing the sampling of the second negative pole to the second negative pole sampled point
Signal；
The second voltage pull-up module and the second positive pole sampled point, the second negative pole sampled point and the reference data
Voltage end connects, and second voltage pull-up module is configurable to generate pull-up voltage, using the upper pull-up voltage by described the
Two positive pole sampled signals and the second negative pole sampled signal pull-up are positive voltage signal.
6. high pressure sample circuit according to claim 5, it is characterised in that the second positive pole sampling module includes series connection
The 7th resistor network and the 8th resistor network；
Wherein, one end of the 7th resistor network is connected with the second end of the positive switch module, the 7th resistance net
The other end of network is connected with one end of the 8th resistor network and the second positive pole sampled point；
The other end of 8th resistor network is connected with the reference data voltage end.
7. high pressure sample circuit according to claim 5, it is characterised in that the second negative pole sampling module includes series connection
The 9th resistor network and the tenth resistor network；
Wherein, one end of the 9th resistor network is connected with the reference data voltage end, the 9th resistor network it is another
One end is connected with one end of the tenth resistor network and the second negative pole sampled point；
The other end of tenth resistor network is connected with the second end of the negative switch module.
8. high pressure sample circuit according to claim 5, it is characterised in that the second voltage pull-up module includes second
Power supply, and the 11st resistor network and the 12nd resistor network of series connection；
One end of 11st resistor network is connected with the second positive pole sampled point, the 11st resistor network it is another
End is connected with the positive pole of the second source and one end of the 12nd resistor network；
The other end of 12nd resistor network is connected with the second negative pole sampled point；
The negative pole of the second source is connected with the reference data voltage end.
9. high pressure sample circuit as claimed in any of claims 1 to 8, it is characterised in that the reference data electricity
Pressure side is independently of the high tension loop positive terminal of the high pressure sample circuit and the high tension loop negative pole end of the high pressure sample circuit.
10. high pressure sample circuit according to claim 2, it is characterised in that the first positive pole sampling module also includes
First switch device, one end of the first resistor network pass through the first switch device and the power battery pack to be measured
Positive pole connects.
11. high pressure sample circuit according to claim 3, it is characterised in that the first negative pole sampling module also includes
Second switch device, the other end of the 4th resistor network pass through the second switch device and the power battery pack to be measured
Negative pole connection.
12. high pressure sample circuit according to claim 6, it is characterised in that the second positive pole sampling module also includes
3rd switching device, one end of the 7th resistor network pass through the 3rd switching device and the positive switch module the
Two ends connect.
13. high pressure sample circuit according to claim 7, it is characterised in that the second negative pole sampling module also includes
4th switching device, the other end of the tenth resistor network pass through the 4th switching device and the negative switch module
Second end connects.
14. according to the high pressure sample circuit described in claim 1,2,5,6 or 12, it is characterised in that the positive switch module
Including positive pole relay.
15. according to the high pressure sample circuit described in claim 1,3,5,7 or 13, it is characterised in that the negative switch module
Including negative pole relay.
16. a kind of battery management system, it is characterised in that sample electricity including the high pressure described in any one in claim 1-15
Road；
The battery management system also includes the processor being connected with the high pressure sample circuit, and the processor is configured as：
Based on the first positive pole sampled signal and the first negative pole sampled signal, the voltage of the first end of positive switch module is calculated
With the voltage of the first end of negative switch module；
According to the voltage of the first end of the positive switch module and the voltage of the first end of the negative switch module, moved
The high tension loop voltage of power battery.
17. battery management system according to claim 16, it is characterised in that the processor is additionally configured to：
Based on the second positive pole sampled signal and the second negative pole sampled signal, the second end of the positive switch module is calculated
The voltage at the second end of voltage and the negative switch module；
According to the voltage of the first end of the positive switch module, the first end of the negative switch module voltage, it is described just
The voltage at the second end of the voltage at the second end of pole switch module and the negative switch module, obtains the positive switch module
Voltage and the negative switch module voltage.
18. battery management system according to claim 17, it is characterised in that the processor is additionally configured to：
The voltage of the positive switch module and default positive pole state threshold voltage are contrasted, obtains positive switch module contrast knot
Fruit；
According to the positive switch module comparing result, the state of the positive switch module is obtained.
19. battery management system according to claim 17, it is characterised in that the processor is additionally configured to：
The voltage of the negative switch module and default negative pole state threshold voltage are contrasted, obtains negative switch module contrast knot
Fruit；
According to the negative switch module comparing result, the state of the negative switch module is obtained.
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| CN201710757182.0A CN107727923A (en) | 2017-08-29 | 2017-08-29 | High-voltage sampling circuit and battery management system |
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Cited By (1)
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Application publication date: 20180223 |