CN208888353U - A kind of measuring circuit of battery pack DC internal resistance - Google Patents
A kind of measuring circuit of battery pack DC internal resistance Download PDFInfo
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- CN208888353U CN208888353U CN201821332360.1U CN201821332360U CN208888353U CN 208888353 U CN208888353 U CN 208888353U CN 201821332360 U CN201821332360 U CN 201821332360U CN 208888353 U CN208888353 U CN 208888353U
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Abstract
The utility model relates to a kind of measuring circuits of battery pack DC internal resistance comprising charging circuit, voltage hold circuit and differential pressure measurement by magnification circuit, the charging circuit include power supply and switch S1, and power supply is connect by switch S1 with battery pack；The voltage hold circuit includes capacitor C1 and switch S2, and capacitor C1 is connect by switch S2 with battery pack；The product of insulation resistance >=50000 megaohm of the capacitor, insulation resistance and capacitance is greater than 3000s；The differential pressure measurement by magnification circuit connects capacitor C1 for amplifying and measuring the voltage difference between capacitance present and battery pack, one end, and the other end connects battery pack.The utility model avoids the absolute value of voltage that electric discharge front and back is obtained using bleeder circuit, and signal decaying is greatly reduced.
Description
Technical field
The utility model relates to battery fields of measurement, the measuring circuit of specifically a kind of battery pack DC internal resistance.
Background technique
The internal resistance of battery refers to battery at work, and electric current flows through resistance suffered by inside battery, it includes in ohm
Resistance and polarization resistance, polarization resistance include activation polarization internal resistance and concentration polarization internal resistance again.
The different types of internal resistance of cell is different.The battery of same type, due to inconsistent, the internal resistance of internal chemical characteristic
It is different.The internal resistance very little of battery, we generally define it with the unit of milliohm.Internal resistance is a weight for measuring battery performance
Want technical indicator.
The internal resistance very little of battery, we generally define it with the unit of micro-ohm or milliohm.In general measurement occasion,
We require the internal resistance measurement trueness error of battery that must control within positive and negative 5%.This one small resistance value and so accurately
It is required that must be measured with special instrument.
There are DC test method and two kinds of alternating-current measurement method to the measurement method of the internal resistance of cell, wherein DC test method is divided into again
Mise-a-la-masse method and electric discharge.A kind of measurement method for the internal resistance of cell is referred in 61960 standard of IEC.It is at battery pack both ends
Discharge load is accessed, last voltage value U1 first is recorded to battery discharge 10s with the electric current I1 of 0.2C；1C electric current I2 is instantaneously used again
To battery discharge 1s, last voltage value U2 is recorded；DC internal resistance is calculated divided by (I2-I1) according to R=(U1-U2).Due to battery
Internal resistance value very little, voltage change amplitude at a certain current is relatively small, difficulty is brought to accurate measurement, due to discharging
The variation of journey voltage needs that stability region is selected to calculate voltage change amplitude.
DOE/ID-11069 FreedomCAR power auxiliary type battery testing handbook mentions the internal resistance measurement under a kind of electric discharge
Method, to load discharge 10s after discharge cycle starts, discharge internal resistance=(Vt1-Vt0)/(It0-It1).If It0=0,
Then discharge internal resistance=(Vt0-Vt1)/It1.
Mise-a-la-masse method measures DC internal resistance, is first to measure the preceding voltage value that charges, then connect power supply pair at battery pack both ends
Battery pack charges, and obtains a charged voltage value, and the voltage value of charging front and back is subtracted each other, is calculated in conjunction with charging current
And obtain internal charging resistance.
As it can be seen that in above-mentioned DC test method, either mise-a-la-masse method or electric discharge are required to be charged by measurement
The battery voltage absolute value of front and back or electric discharge front and back, two absolute value of voltage then subtracted each other to obtain voltage difference,
Voltage difference is used for the calculating of DC internal resistance in conjunction with discharge current.The voltage difference of measurement battery pack charging front and back in the prior art
The circuit of value is usually as shown in Figure 1, battery pack is sequentially connected at branch pressure voltage, conditioning filter circuit, analog-digital converter and data
Manage device.The circuit of the voltage difference before and after battery power discharge is measured in the prior art usually as shown in Fig. 2, battery pack is sequentially connected
Branch pressure voltage, conditioning filter circuit, analog-digital converter and data processor.Because the input range of high-precision adc compared with
It is small, usually only 0~2.5V, and battery voltage scope is from 3V~600V, in order to all measure the voltage of wide scope
Range, therefore it is provided with bleeder circuit.Battery voltage is narrowed down to and can be detected by analog-digital converter gamut using bleeder circuit
It arrives, so very big attenuation ratio can be used.If there is a kind of internal resistance for needing to measure 300V 100AH lithium battery group, when negative
When very high current cannot be done by carrying electric current, such as 1A discharge load.So for the variation for measuring 300V voltage, attenuation ratio setting
For 120:1；When internal resistance is in 10mR, voltage change 10mV after electric discharge, after bleeder circuit, signal becomes 83uV, and signal declines
Subtract big.In order to adapt to current high-precision adc input range requirement, then the amplifier to be used that is bound to is by voltage difference
Signal amplification, enlargement ratio is larger, if doing so can amplify on year-on-year basis dc noise, leads to final 24bit Σ △ pattern number
Converter measurement error is 20% or more, it is difficult to meet the error requirements lower than 10%.In short, Traditional DC internal resistance measurement method
The problem of it is big that there are dynamic range requirements, low precision.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of battery packs for being adaptable to wide-range voltage, survey
The high measuring circuit of accuracy of measurement.
For the attainment of one's purpose, technical solution provided by the utility model are as follows:
A kind of measuring circuit of battery pack DC internal resistance comprising charging circuit, voltage hold circuit and differential pressure amplification are surveyed
Circuit is measured, the charging circuit includes power supply and switch S1, and power supply is connect by switch S1 with battery pack；The voltage is protected
Holding circuit includes capacitor C1 and switch S2, and capacitor C1 is connect by switch S2 with battery pack；The insulation resistance of the capacitor >=
50000 megaohms, the product of insulation resistance and capacitance is greater than 3000s；The differential pressure measurement by magnification circuit is for amplifying and surveying
The voltage difference between capacitance present and battery pack is measured, one end connects capacitor C1, and the other end connects battery pack.
Preferably, the voltage hold circuit further includes current-limiting resistance R10 and bleeder resistance R13, current-limiting resistance R10 with
It is connect after capacitor C1 series connection with battery pack；Bleeder resistance R13 is connect by current-limiting resistance R10 and switch S2 with capacitor C1.
Preferably, the differential pressure measurement by magnification circuit include sequentially connected signal amplification circuit, analog-digital converter and
Data processor, signal amplification circuit one end connect capacitor C1, and the signal amplification circuit other end connects battery pack, signal amplification electricity
Road is used to amplify the voltage differential signal between capacitance present and battery pack, and analog-digital converter is used to amplified signal being converted to number
Word signal, data processor are used to be calculated the DC internal resistance of battery pack.
Preferably, the signal amplification circuit includes protection circuit and difference amplifier, the protection circuit include
Resistance R11, double base diode Q1, operational amplifier U1A, resistance R12, double base diode Q2 and operational amplifier U1B,
The one end resistance R11 is connect with capacitor C1 cathode, and the other end is connect with the emitter of double base diode Q2, double base diode Q2
Emitter connect with the pin 2 of operational amplifier U1A, the pin 3 and pin 1 of operational amplifier U1A connect difference amplifier
An input terminal；The one end resistance R12 is connect with battery electrode, and the other end is connect with the emitter of double base diode Q2,
The emitter of double base diode Q2 is connect with the pin 5 of operational amplifier U1B, the pin 6 and pin 7 of operational amplifier U1B
Connect another input terminal of difference amplifier.
Preferably, for the insulation resistance of switch S1 less than 10000 megaohms, the insulation resistance of switch S2 is greater than 1,000,000,000,000
Europe.
A kind of measuring circuit of battery pack DC internal resistance comprising discharge circuit, voltage hold circuit and differential pressure amplification are surveyed
Circuit is measured, the discharge circuit includes load and switch S1, and load is connect by switch S1 with battery pack；The voltage is protected
Holding circuit includes capacitor C1 and switch S2, and capacitor C1 is connect by switch S2 with battery pack；The insulation resistance of the capacitor >=
50000 megaohms, the product of insulation resistance and capacitance is greater than 3000s；The differential pressure measurement by magnification circuit is current for measuring
Voltage difference between capacitor and battery pack, one end connect capacitor C1, and the other end connects battery pack.
Preferably, the voltage hold circuit further includes current-limiting resistance R10, after current-limiting resistance R10 connects with capacitor C1
It is connect with battery pack.
Preferably, the voltage hold circuit further includes bleeder resistance R13, and bleeder resistance R13 passes through current-limiting resistance R10
It is connect with switch S2 with capacitor C1.
Preferably, the differential pressure measurement by magnification circuit include sequentially connected signal amplification circuit, analog-digital converter and
Data processor, signal amplification circuit one end connect capacitor C1, and the signal amplification circuit other end connects battery pack, signal amplification electricity
Road is used to amplify the voltage differential signal between capacitance present and battery pack, and analog-digital converter is used to amplified signal being converted to number
Word signal, data processor are used to be calculated the DC internal resistance of battery pack.
Preferably, the signal amplification circuit includes protection circuit and difference amplifier, the protection circuit include
Resistance R11, double base diode Q1, operational amplifier U1A, resistance R12, double base diode Q2 and operational amplifier U1B, electricity
Resistance one end R11 is connect with capacitor C1 cathode, and the other end is connect with the emitter of double base diode Q2, double base diode Q2's
Emitter is connect with the pin 2 of operational amplifier U1A, pin 3 and pin 1 the connection difference amplifier of operational amplifier U1A
One input terminal；The one end resistance R12 is connect with battery electrode, and the other end is connect with the emitter of double base diode Q2, double
The emitter of base diode Q2 is connect with the pin 5 of operational amplifier U1B, and the pin 6 and pin 7 of operational amplifier U1B connects
Connect another input terminal of difference amplifier.
Preferably, for the insulation resistance of switch S1 less than 10000 megaohms, the insulation resistance of switch S2 is greater than 1,000,000,000,000
Europe.
In the measuring circuit of the utility model battery pack DC internal resistance, using high insulation resistance and the capacitor of high RC time come
The voltage value before battery pack charging or before electric discharge is kept, and then before having directly obtained battery set charge/discharge by differential pressure amplifier
Voltage difference afterwards avoids the absolute value of voltage that electric discharge front and back is obtained using bleeder circuit, and signal decaying is greatly reduced；In this way
Lesser enlargement ratio can be used in voltage differential signal when being output to analog-digital converter, so that dc noise is low, finally calculate
DC internal resistance precision it is high, be adapted to the battery pack of 1V~∞ V.
Detailed description of the invention
Fig. 1 is in the prior art using the functional block diagram of mise-a-la-masse method measurement battery pack DC internal resistance；
Fig. 2 is in the prior art using the functional block diagram of electric discharge measurement battery pack DC internal resistance；
Fig. 3 is the functional block diagram of the measuring circuit of 1 battery pack DC internal resistance of embodiment；
Fig. 4 is the circuit diagram of the measuring circuit of 1 battery pack DC internal resistance of embodiment；
Fig. 5 is the functional block diagram of the measuring circuit of 2 battery pack DC internal resistance of embodiment；
Fig. 6 is the circuit diagram of the measuring circuit of 2 battery pack DC internal resistance of embodiment.
Specific embodiment
For the content for further appreciating that the utility model, the utility model is described in detail in conjunction with the embodiments, it is real below
Example is applied for illustrating the utility model, but is not intended to limit the scope of the present invention.
Embodiment 1
A kind of measuring circuit of battery pack DC internal resistance, as shown in Figure 3-4 comprising charging circuit, voltage hold circuit
With differential pressure measurement circuit, the charging circuit includes power supply and switch S1, and power supply is connect by switch S1 with battery pack；Institute
The voltage hold circuit stated includes capacitor C1 and switch S2, and capacitor C1 is connect by switch S2 with battery pack；The capacitor it is exhausted
The product of edge resistance >=50000 megaohm, insulation resistance and capacitance is greater than 3000s；The differential pressure measurement circuit is for amplifying
And the voltage difference between capacitance present and battery pack is measured, one end connects capacitor C1, and the other end connects battery pack.
The voltage hold circuit further includes current-limiting resistance R10, current-limiting resistance R10 connect with capacitor C1 after with battery pack
Connection.The voltage hold circuit further includes bleeder resistance R13, bleeder resistance R13 by current-limiting resistance R10 and switch S2 and
Capacitor C1 connection.
The differential pressure measurement circuit includes sequentially connected signal amplification circuit, analog-digital converter and data processor,
Signal amplification circuit one end connects capacitor C1, and the signal amplification circuit other end connects battery pack, and signal amplification circuit will be for that will work as
Voltage differential signal amplification between preceding capacitor and battery pack, analog-digital converter are used to amplified signal being converted to digital signal, number
It is used to be calculated the DC internal resistance of battery pack according to processor.
Referring to Fig. 3, the signal amplification circuit includes protection circuit and difference amplifier, the protection circuit include
Resistance R11, double base diode Q1, operational amplifier U1A, resistance R12, double base diode Q2 and operational amplifier U1B, electricity
Resistance one end R11 is connect with capacitor C1 cathode, and the other end is connect with the emitter of double base diode Q2, double base diode Q2's
Emitter is connect with the pin 2 of operational amplifier U1A, pin 3 and pin 1 the connection difference amplifier of operational amplifier U1A
One input terminal；The one end resistance R12 is connect with battery electrode, and the other end is connect with the emitter of double base diode Q2, double
The emitter of base diode Q2 is connect with the pin 5 of operational amplifier U1B, and the pin 6 and pin 7 of operational amplifier U1B connects
Connect another input terminal of difference amplifier.
For the insulation resistance of switch S1 less than 10000 megaohms, the insulation resistance of switch S2 is greater than 1000000 megaohms.Switch S2
Using the relay such as mercury relay, reed switch relay etc. of high insulation resistance, such as HFW-1A-12.Switch S1 is using low
The relay of insulation resistance may insure S1 response speed faster in this way.
Wherein capacitor C1 uses the thin-film capacitor of high insulation resistance, such as the electricity of polypropylene, polytetrafluoroethylene (PTFE) high RC time
Hold, can use: capacitance 0.22uF, voltage rating 630V, CBB electric capacity.
Resistance R13 is the bleeder resistance of C1 capacitor, can use resistance value 10KR, 1W.
Resistance R10 is limitation to capacitance charging current, prevents switch S2 from damaging, and R10 can use resistance value 100R,
0.5W。
Resistance R11 and Q1 are to prevent there is the protection beyond amplifier input range to operational amplifier U1A, and wherein Q1 is selected
It selects the double base diode of the same encapsulation of Low dark curient electric current or is saved using the PN of JFET.Q1 can select BAV199.Resistance
R11 can select 10KR, 0.25W.When capacitance terminal voltage is excessive, then resistance R11 and Q1 can be by voltage
Resistance R12 and Q2 are to prevent there is the protection beyond amplifier input range to operational amplifier U1B, and wherein Q2 is selected
It selects the double base diode of the same encapsulation of Low dark curient electric current or is saved using the PN of JFET.Q2 can select BAV199.Resistance
R12 can select 10KR, 0.25W.
Operational amplifier U1A and operational amplifier U1B be also using high input resistance same wrap-around arithmetic amplifier such as
JFET type, CMOS type, LiCMOS type etc., for example LMC6082 can be selected.Operational amplifier U1A and operational amplifier U1B both made
For the signal input part of difference amplifier, while insulation protection is played to difference amplifier again.
Resistance R11, double base diode Q1 and operational amplifier U1A and resistance R12, double base diode Q2 and fortune
The branch that amplifier U1B constitutes mirror symmetry each other is calculated, influence of two branches to voltage value is identical, so that it is guaranteed that being input to difference
The voltage difference divided in amplifier is equal to the voltage difference between capacitance terminal and battery pack end, improves accuracy of measurement.
Referring to Fig. 3, a kind of measurement method of battery pack DC internal resistance includes the following steps:
(1) battery pack and high insulation resistance capacitance connection are charged, capacitor is made to collect electricity before battery pack charging
Press V0；The product of insulation resistance >=50000 megaohm of the capacitor, insulation resistance and capacitance is greater than 3000s；Specifically switch
S1 is disconnected, switch S2 is closed, and after making capacitor C1 fully charged, disconnects switch S2, capacitor keeps battery voltage V0, due to capacitor
The characteristic of high insulation resistance and high RC time, so that capacitor voltage within the charging time of step (2) is protected substantially
It holds constant.
(2) connection with high insulation resistance capacitor is disconnected, battery pack is connected to power supply, it is certain with electric current I0 constant-current charge
Time T obtains battery pack charged voltage V1；Switch S2 is specifically remained open, closure switch S1 allows power supply to fill battery pack
Electricity, the battery voltage after charging are V1；
(3) electricity is calculated in voltage V0, battery pack charged voltage V1 and charging current I0 before charging according to battery pack
The DC internal resistance Rdis of pond group.Calculation formula can be DC internal resistance Rdis=(V1-V0)/I0 of battery pack.In step (2)
The time T of constant-current charge is 10s.
Referring to Fig. 3, since battery pack and capacitor are conllinear in anode, when with reference point SGND, Vp=-V0；Vn=-V1,
To which amplifier inputs Vp-Vn=V1-V0, amplifier can directly amplify the differential pressure signal of this Vp-Vn without attenuator,
Dynamic range problem is solved with regard to this.
Furthermore, it is contemplated that high insulation resistance capacitor there may be small voltage drop during battery pack charges, and to walk
Suddenly the voltage difference of (3) can be bigger than normal, it is possible to once compensate the voltage difference.Specific method is: by high insulation resistance capacitor
After charging, its voltage drop-out value Δ V under same time T, open-circuit condition is measured, by the voltage difference of step (3) and the voltage
Drop-out value Δ V subtracts each other, to obtain compensated voltage difference.
In addition it considers in circuit operational process, double base diode Q1, double base diode Q2, U1A, U1B, resistance
R11, resistance R12, capacitor C1 may temperature increase, to reduce its own impedance, increase voltage decline, leakage current, therefore
It can be potted temperature coupling to component, impedance can also be further increased using semiconductor refrigerating.
Embodiment 2
A kind of measuring circuit of battery pack DC internal resistance, as seen in figs. 5-6 comprising discharge circuit, voltage hold circuit
With differential pressure measurement circuit, the discharge circuit includes load and switch S1, and load is connect by switch S1 with battery pack；Institute
The voltage hold circuit stated includes capacitor C1 and switch S2, and capacitor C1 is connect by switch S2 with battery pack；The capacitor it is exhausted
The product of edge resistance >=50000 megaohm, insulation resistance and capacitance is greater than 3000s；The differential pressure measurement circuit is for amplifying
And the voltage difference between capacitance present and battery pack is measured, one end connects capacitor C1, and the other end connects battery pack.
The voltage hold circuit further includes current-limiting resistance R10, current-limiting resistance R10 connect with capacitor C1 after with battery pack
Connection.The voltage hold circuit further includes bleeder resistance R13, bleeder resistance R13 by current-limiting resistance R10 and switch S2 and
Capacitor C1 connection.
The differential pressure measurement circuit includes sequentially connected signal amplification circuit, analog-digital converter and data processor,
Signal amplification circuit one end connects capacitor C1, and the signal amplification circuit other end connects battery pack, and signal amplification circuit will be for that will work as
Voltage differential signal amplification between preceding capacitor and battery pack, analog-digital converter are used to amplified signal being converted to digital signal, number
It is used to be calculated the DC internal resistance of battery pack according to processor.
Referring to Fig. 6, the signal amplification circuit includes protection circuit and difference amplifier, the protection circuit include
Resistance R11, double base diode Q1, operational amplifier U1A, resistance R12, double base diode Q2 and operational amplifier U1B, electricity
Resistance one end R11 is connect with capacitor C1 cathode, and the other end is connect with the emitter of double base diode Q2, double base diode Q2's
Emitter is connect with the pin 2 of operational amplifier U1A, pin 3 and pin 1 the connection difference amplifier of operational amplifier U1A
One input terminal；The one end resistance R12 is connect with battery electrode, and the other end is connect with the emitter of double base diode Q2, double
The emitter of base diode Q2 is connect with the pin 5 of operational amplifier U1B, and the pin 6 and pin 7 of operational amplifier U1B connects
Connect another input terminal of difference amplifier.
For the insulation resistance of switch S1 less than 10000 megaohms, the insulation resistance of switch S2 is greater than 1000000 megaohms.Switch S2
Using the relay such as mercury relay, reed switch relay etc. of high insulation resistance, such as HFW-1A-12.Switch S1 is using low
The relay of insulation resistance may insure S1 response speed faster in this way.
Wherein capacitor C1 uses the thin-film capacitor of high insulation resistance, such as the electricity of polypropylene, polytetrafluoroethylene (PTFE) high RC time
Hold, can use: capacitance 0.22uF, voltage rating 630V, CBB electric capacity.
Resistance R13 is the bleeder resistance of C1 capacitor, can use resistance value 10KR, 1W.
Resistance R10 is limitation to capacitance charging current, prevents switch S2 from damaging, and R10 can use resistance value 100R,
0.5W。
Resistance R11 and Q1 are to prevent there is the protection beyond amplifier input range to operational amplifier U1A, and wherein Q1 is selected
It selects the double base diode of the same encapsulation of Low dark curient electric current or is saved using the PN of JFET.Q1 can select BAV199.Resistance
R11 can select 10KR, 0.25W.When capacitance terminal voltage is excessive, then resistance R11 and Q1 can be by voltage
Resistance R12 and Q2 are to prevent there is the protection beyond amplifier input range to operational amplifier U1B, and wherein Q2 is selected
It selects the double base diode of the same encapsulation of Low dark curient electric current or is saved using the PN of JFET.Q2 can select BAV199.Resistance
R12 can select 10KR, 0.25W.
Operational amplifier U1A and operational amplifier U1B be also using high input resistance same wrap-around arithmetic amplifier such as
JFET type, CMOS type, LiCMOS type etc., for example LMC6082 can be selected.Operational amplifier U1A and operational amplifier U1B both made
For the signal input part of difference amplifier, while insulation protection is played to difference amplifier again.
Resistance R11, double base diode Q1 and operational amplifier U1A and resistance R12, double base diode Q2 and fortune
The branch that amplifier U1B constitutes mirror symmetry each other is calculated, influence of two branches to voltage value is identical, so that it is guaranteed that being input to difference
The voltage difference divided in amplifier is equal to the voltage difference between capacitance terminal and battery pack end, improves accuracy of measurement.
Referring to Fig. 5, a kind of measurement method of battery pack DC internal resistance includes the following steps:
(1) battery pack and high insulation resistance capacitance connection are charged, it is electric before so that capacitor is collected battery power discharge
Press V0；The product of insulation resistance >=50000 megaohm of the capacitor, insulation resistance and capacitance is greater than 3000s；Specifically switch
S1 is disconnected, switch S2 is closed, and after making capacitor C1 fully charged, disconnects switch S2, capacitor keeps battery voltage V0, due to capacitor
The characteristic of high insulation resistance and high RC time, so that capacitor voltage within the discharge time of step (2) is protected substantially
It holds constant.
(2) connection with high insulation resistance capacitor is disconnected, battery pack and load are connected, it is certain with electric current I0 constant-current discharge
Time T obtains voltage V1 after battery power discharge；Switch S2 is specifically remained open, closure switch S1 allows battery pack to put load
Electricity, the battery voltage after electric discharge are V1；
(3) electricity is calculated according to voltage V1 and discharge current I0 after voltage V0, battery power discharge before battery power discharge
The DC internal resistance Rdis of pond group.Calculation formula can be DC internal resistance Rdis=(V0-V1)/I0 of battery pack.In step (2)
The time T of constant-current discharge is 10s.
Referring to Fig. 5, since battery pack and capacitor are conllinear in anode, when with reference point SGND, Vp=-V0；Vn=-V1,
To which amplifier inputs Vn-Vp=V0-V1, amplifier can directly amplify the differential pressure signal of this Vn-Vp without attenuator,
Dynamic range problem is solved with regard to this.
Furthermore, it is contemplated that high insulation resistance capacitor there may be small voltage drop during battery power discharge, and to walk
Suddenly the voltage difference of (3) can be less than normal, it is possible to once compensate the voltage difference.Specific method is: by high insulation resistance capacitor
After charging, its voltage drop-out value Δ V under same time T, open-circuit condition is measured, by voltage drop-out value Δ V and step (3)
Voltage difference be added, to obtain compensated voltage difference.
In addition it considers in circuit operational process, double base diode Q1, double base diode Q2, U1A, U1B, resistance
R11, resistance R12, capacitor C1 may temperature increase, to reduce its own impedance, increase voltage decline, leakage current, therefore
It can be potted temperature coupling to component, impedance can also be further increased using semiconductor refrigerating.
The utility model is described in detail in conjunction with the embodiments above, but the content be only the utility model compared with
Good embodiment, should not be considered as limiting the scope of the present invention.It is made according to the scope of application of this utility model
All the changes and improvements etc. should all be still fallen within the patent covering scope of the utility model.
Claims (10)
1. a kind of measuring circuit of battery pack DC internal resistance, it is characterised in that: it includes charging circuit, voltage hold circuit and difference
Big measuring circuit is pressed, the charging circuit includes power supply and switch S1, and power supply is connect by switch S1 with battery pack；It is described
Voltage hold circuit include capacitor C1 and switch S2, capacitor C1 is connect by switch S2 with battery pack；The insulation of the capacitor
The product of resistance >=50000 megaohm, insulation resistance and capacitance is greater than 3000s；The differential pressure measurement by magnification circuit is for putting
Greatly and the voltage difference between capacitance present and battery pack is measured, one end connects capacitor C1, and the other end connects battery pack.
2. the measuring circuit of battery pack DC internal resistance according to claim 1, it is characterised in that: the voltage keeps electricity
Road further includes current-limiting resistance R10 and bleeder resistance R13, and current-limiting resistance R10 is connect after connecting with capacitor C1 with battery pack；Vent discharge
Resistance R13 is connect by current-limiting resistance R10 and switch S2 with capacitor C1.
3. the measuring circuit of battery pack DC internal resistance according to claim 1, it is characterised in that: the differential pressure, which is amplified, to be surveyed
Amount circuit includes sequentially connected signal amplification circuit, analog-digital converter and data processor, the connection of signal amplification circuit one end
Capacitor C1, the signal amplification circuit other end connect battery pack, and signal amplification circuit is used for will be between capacitance present and battery pack
Voltage differential signal amplification, analog-digital converter are used to be converted to amplified signal digital signal, and data processor is for being calculated
The DC internal resistance of battery pack.
4. the measuring circuit of battery pack DC internal resistance according to claim 3, it is characterised in that: the signal amplifies electricity
Road includes protection circuit and difference amplifier, the protection circuit include resistance R11, double base diode Q1, operation amplifier
Device U1A, resistance R12, double base diode Q2 and operational amplifier U1B, the one end resistance R11 is connect with capacitor C1 cathode, another
End is connect with the emitter of double base diode Q2, and the emitter of double base diode Q2 and the pin 2 of operational amplifier U1A connect
It connects, an input terminal of pin 3 and pin 1 the connection difference amplifier of operational amplifier U1A；The one end resistance R12 and battery pack
Cathode connection, the other end are connect with the emitter of double base diode Q2, the emitter and operation amplifier of double base diode Q2
The pin 5 of device U1B connects, another input terminal of pin 6 and pin 7 the connection difference amplifier of operational amplifier U1B.
5. the measuring circuit of battery pack DC internal resistance according to claim 1, it is characterised in that: the insulation resistance of switch S1
Less than 10000 megaohms, the insulation resistance of switch S2 is greater than 1000000 megaohms.
6. a kind of measuring circuit of battery pack DC internal resistance, it is characterised in that: it includes discharge circuit, voltage hold circuit and difference
Big measuring circuit is pressed, the discharge circuit includes load and switch S1, and load is connect by switch S1 with battery pack；It is described
Voltage hold circuit include capacitor C1 and switch S2, capacitor C1 is connect by switch S2 with battery pack；The insulation of the capacitor
The product of resistance >=50000 megaohm, insulation resistance and capacitance is greater than 3000s；The differential pressure measurement by magnification circuit is for surveying
The voltage difference between capacitance present and battery pack is measured, one end connects capacitor C1, and the other end connects battery pack.
7. the measuring circuit of battery pack DC internal resistance according to claim 6, it is characterised in that: the voltage keeps electricity
Road further includes current-limiting resistance R10 and bleeder resistance R13, and current-limiting resistance R10 is connect after connecting with capacitor C1 with battery pack；Vent discharge
Resistance R13 is connect by current-limiting resistance R10 and switch S2 with capacitor C1.
8. the measuring circuit of battery pack DC internal resistance according to claim 6, it is characterised in that: the differential pressure, which is amplified, to be surveyed
Amount circuit includes sequentially connected signal amplification circuit, analog-digital converter and data processor, the connection of signal amplification circuit one end
Capacitor C1, the signal amplification circuit other end connect battery pack, and signal amplification circuit is used for will be between capacitance present and battery pack
Voltage differential signal amplification, analog-digital converter are used to be converted to amplified signal digital signal, and data processor is for being calculated
The DC internal resistance of battery pack.
9. the measuring circuit of battery pack DC internal resistance according to claim 8, it is characterised in that: the signal amplifies electricity
Road includes protection circuit and difference amplifier, the protection circuit include resistance R11, double base diode Q1, operation amplifier
Device U1A, resistance R12, double base diode Q2 and operational amplifier U1B, the one end resistance R11 is connect with capacitor C1 cathode, another
End is connect with the emitter of double base diode Q2, and the emitter of double base diode Q2 and the pin 2 of operational amplifier U1A connect
It connects, an input terminal of pin 3 and pin 1 the connection difference amplifier of operational amplifier U1A；The one end resistance R12 and battery pack
Cathode connection, the other end are connect with the emitter of double base diode Q2, the emitter and operation amplifier of double base diode Q2
The pin 5 of device U1B connects, another input terminal of pin 6 and pin 7 the connection difference amplifier of operational amplifier U1B.
10. the measuring circuit of battery pack DC internal resistance according to claim 6, it is characterised in that: the insulated electro of switch S1
Less than 10000 megaohms, the insulation resistance of switch S2 is greater than 1000000 megaohms for resistance.
Priority Applications (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109061500A (en) * | 2018-08-17 | 2018-12-21 | 杭州固恒能源科技有限公司 | Voltage difference measurement method and measuring circuit before and after a kind of battery set charge/discharge |
| CN111679216A (en) * | 2020-06-24 | 2020-09-18 | 重庆长安新能源汽车科技有限公司 | Device and method for detecting high-voltage connection reliability of power battery |
| CN113125979A (en) * | 2019-12-31 | 2021-07-16 | 华为技术有限公司 | Storage battery internal resistance detection device and method |
| CN116222693A (en) * | 2023-05-10 | 2023-06-06 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Natural river channel water level automatic monitoring method based on water gauge reflection |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109061500A (en) * | 2018-08-17 | 2018-12-21 | 杭州固恒能源科技有限公司 | Voltage difference measurement method and measuring circuit before and after a kind of battery set charge/discharge |
| CN109061500B (en) * | 2018-08-17 | 2023-12-08 | 杭州固恒能源科技有限公司 | Method and circuit for measuring voltage difference before and after charging and discharging of battery pack |
| CN113125979A (en) * | 2019-12-31 | 2021-07-16 | 华为技术有限公司 | Storage battery internal resistance detection device and method |
| CN111679216A (en) * | 2020-06-24 | 2020-09-18 | 重庆长安新能源汽车科技有限公司 | Device and method for detecting high-voltage connection reliability of power battery |
| CN111679216B (en) * | 2020-06-24 | 2022-08-02 | 重庆长安新能源汽车科技有限公司 | Device and method for detecting high-voltage connection reliability of power battery |
| CN116222693A (en) * | 2023-05-10 | 2023-06-06 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Natural river channel water level automatic monitoring method based on water gauge reflection |
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