CN110187286A - Detection circuit, power-supply system and the vehicle of copper bar connection status - Google Patents
Detection circuit, power-supply system and the vehicle of copper bar connection status Download PDFInfo
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- CN110187286A CN110187286A CN201910470252.3A CN201910470252A CN110187286A CN 110187286 A CN110187286 A CN 110187286A CN 201910470252 A CN201910470252 A CN 201910470252A CN 110187286 A CN110187286 A CN 110187286A
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- battery pack
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The present invention provides detection circuit, power-supply system and the vehicle of a kind of copper bar connection status.The detection circuit includes: bleeder circuit, voltage comparator circuit and processing circuit；Bleeder circuit is in parallel with battery pack to be detected, and bleeder circuit is also connect with the first input end of voltage comparator circuit, and the second input terminal of voltage comparator circuit is connect with battery pack to be detected, and the output end of voltage comparator circuit is connect with processing circuit；Voltage comparator circuit, the voltage that voltage from bleeder circuit to the first input end and battery pack to be detected for being inputted according to are inputted to second input terminal, to processing circuit output voltage signal；The voltage signal is high level signal or zero voltage signal；Processing circuit is used to determine the connection status of copper bar according to the voltage signal.The detection circuit improves the accuracy of copper bar connection status detection.
Description
Technical field
The present invention relates to power technology more particularly to a kind of detection circuit, power-supply system and the vehicles of copper bar connection status.
Background technique
With the fast development of new-energy automobile, power battery pack needs to have as power output most important in vehicle
Standby extreme high reliability, just can ensure that the stable operation of vehicle.Currently, the connection of power battery pack internal model group is using copper
The mode for arranging urgent bolt is electrically connected, can be urgent according to set torque progress by bolt in battery packages timing, but
It is that may cause bolt looseness since later period running conditions of vehicle is complicated, so that copper bar connection be made to loosen.Therefore, it is necessary to the moment
The state of battery pack is monitored, to occur that respective handling can be made in time when copper bar connection loosens.
In the prior art, the connection state in comparison method detection power battery pack between each mould group is generallyd use,
It specifically can be by acquiring copper bar voltage, and the method that collected voltage is compared, under different operating conditions, the difference of electric current
The voltage that will lead to acquisition is different therefore higher to the requirement of real-time of the voltage of acquisition, and needs to be detected for a long time,
It just can correctly be detected in the case where stablizing high current operating condition.
Therefore, using the detection mode of existing comparison method, in the connection state of detection power battery pack internal model group
When, the accuracy of detection is not high.
Summary of the invention
The present invention provides detection circuit, power-supply system and the vehicle of a kind of copper bar connection status, to improve copper bar connection shape
The accuracy of state detection.
The present invention provides a kind of detection circuit of copper bar connection status, which includes: that bleeder circuit, voltage compare
Circuit and processing circuit；
Wherein, the bleeder circuit is in parallel with battery pack to be detected, the bleeder circuit also with the voltage comparator circuit first
Input terminal connection, the second input terminal of the voltage comparator circuit are connect with battery pack to be detected, the output of the voltage comparator circuit
End is connect with the processing circuit；
The voltage comparator circuit, voltage from the bleeder circuit to the first input end and battery to be detected for being inputted according to
The voltage inputted to second input terminal is wrapped, to the processing circuit output voltage signal；The voltage signal be high level signal or
Zero voltage signal；
The processing circuit is used to determine the connection status of copper bar according to the voltage signal, if the voltage signal is high voltage letter
Number, then the connection status of the copper bar is that copper bar connection loosens；If the voltage signal is zero voltage signal, the connection shape of the copper bar
State is that copper bar connection is normal.
Optionally, which includes first resistor and second resistance；The first resistor and the second resistance are connected, should
First resistor is connect with the anode of battery pack to be detected, which connect with the cathode of battery pack to be detected；
The tie point of the first resistor and the second resistance is connect with the first input end of the voltage comparator circuit.
Optionally, the ratio between the resistance value of the first resistor and the resistance value of the second resistance areWherein, z table
Show that the battery core string number of battery pack to be detected, the negative side xth economize on electricity core of battery pack to be detected are electric compared with the voltage
Second input terminal on road connects.
Optionally, which includes: first comparator and the second comparator；
Wherein, the reverse input end of the first comparator is connect with the bleeder circuit,
The reverse input end of second comparator is connect with battery pack to be detected；The positive input of the first comparator and
The positive input of second comparator is grounded；After the output end of the first comparator is connected with the output end of second comparator
It is connect again with the input terminal of the processing circuit；
The first comparator, when being less than the voltage of battery pack to be detected for the voltage in the bleeder circuit, to the processing
Circuit output high level signal, alternatively, when the voltage of the bleeder circuit is greater than or equal to the voltage of battery pack to be detected, to this
Processing circuit exports zero voltage signal；
Second comparator, when being greater than the voltage of battery pack to be detected for the voltage in the bleeder circuit, to the processing
Circuit output high level signal, alternatively, when the voltage of the bleeder circuit is less than or equal to the voltage of battery pack to be detected, to this
Processing circuit exports zero voltage signal.
Optionally, which further includes 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th electricity
Resistance, the 8th resistance；
Wherein, which connect with the reverse input end of the first comparator and the bleeder circuit respectively；
4th resistance connects with the positive input of the reverse input end of the first comparator and second comparator respectively
It connects；
5th resistance is connect with the positive input of second comparator and grounding point respectively；
6th resistance is connect with the reverse input end of second comparator and battery pack to be detected respectively；
7th resistance connects with the reverse input end of the positive input of the first comparator and second comparator respectively
It connects；
8th resistance is connect with the positive input of the first comparator and grounding point respectively；
The resistance value of the 3rd resistor is equal to the resistance value of the 6th resistance, and the resistance value of the 4th resistance is equal to the 7th resistance
Resistance value, the resistance value of the 5th resistance are equal to the resistance value of the 8th resistance.
Optionally, which further includes reverse-connection preventing circuit；
The reverse-connection preventing circuit is connect with the voltage comparator circuit and the processing circuit respectively；
The reverse-connection preventing circuit is used to prevent electric current reversed when bleeder circuit is to the processing circuit output voltage signal.
Optionally, which includes first diode and the second diode；
Wherein, first diode is connect with the first comparator and the processing circuit respectively, second diode respectively with
Second comparator is connected with the processing circuit.
Optionally, which further includes optocoupler；
The anode of the transmitting terminal of the optocoupler is connect with the output end of the voltage comparator circuit, the cathode of the transmitting terminal of the optocoupler
It is connect with the cathode of battery pack to be detected, the collector of the receiving end of the optocoupler is connect with the input terminal of the processing circuit, the light
The emitter of the receiving end of coupling is grounded.
The present invention provides a kind of power-supply system, the detection circuit including battery pack to be detected and copper bar connection status, wherein
Battery pack to be detected is connected with the detection circuit of copper bar connection status；
Connection status of the detection circuit of the copper bar connection status for the copper bar in detection battery pack to be detected；The copper
The detection circuit of connection status is arranged as the detection circuit in any of the above item.
The present invention provides a kind of vehicle, which includes above-mentioned power-supply system.
The present invention provides detection circuit, power-supply system and the vehicle of a kind of copper bar connection status, which includes: point
Volt circuit, voltage comparator circuit and processing circuit；Wherein, bleeder circuit is in parallel with battery pack to be detected, bleeder circuit also with electricity
The first input end connection of comparison circuit is pressed, the second input terminal of voltage comparator circuit is connect with battery pack to be detected, voltage ratio
Output end compared with circuit is connect with processing circuit；Voltage comparator circuit, for being inputted according to bleeder circuit to the first input end
Voltage and the voltage that is inputted to second input terminal of battery pack to be detected, to processing circuit output voltage signal；Voltage letter
Number be high level signal or zero voltage signal；Processing circuit is used to determine the connection status of copper bar according to the voltage signal, if electric
Pressure signal is high voltage signal, then the connection status of copper bar is that copper bar connection loosens；If voltage signal is zero voltage signal, copper
The connection status of row is that copper bar connection is normal.The electricity of the detection circuit battery pack more to be detected and bleeder circuit in hardware
Pressure, so that it is determined that whether the copper bar connection of battery pack to be detected loosens, the detection circuit not by the voltage of battery pack to be detected and
The influence of electric current can normally detect the connection status of copper bar under all operating conditions, improve the standard of copper bar connection status detection
True property.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do one simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram one of the detection circuit of copper bar connection status provided by the invention；
Fig. 2 is a kind of structural schematic diagram two of the detection circuit of copper bar connection status provided by the invention；
Fig. 3 is a kind of structural schematic diagram of power-supply system provided by the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is a kind of structural schematic diagram one of the detection circuit of copper bar connection status provided by the invention.As shown in Figure 1,
The detection circuit of the copper bar connection status may include: bleeder circuit 101, voltage comparator circuit 102 and processing circuit 103.
Wherein, bleeder circuit 101 is in parallel with battery pack 104 to be detected, bleeder circuit 101 also with voltage comparator circuit 102
First input end connection, the second input terminal of voltage comparator circuit 102 connect with battery pack 104 to be detected, and voltage is more electric
The output end on road 102 is connect with processing circuit 103.
Voltage comparator circuit 102, voltage from bleeder circuit 101 to the first input end and electricity to be detected for being inputted according to
The voltage that pond packet 104 is inputted to second input terminal, to 103 output voltage signal of processing circuit；The voltage signal is high level
Signal or zero voltage signal.
Processing circuit 103 is used to determine the connection status of copper bar according to the voltage signal, if voltage signal is high voltage letter
Number, then the connection status of copper bar is that copper bar connection loosens；If voltage signal is zero voltage signal, the connection status of copper bar is copper
Row's connection is normal.
In the present embodiment, the point that bleeder circuit 101 is connect with the first input end of voltage comparator circuit 102 is to divide electricity
The voltage detecting point on road 101, the voltage of the voltage detecting point of bleeder circuit 101 are bleeder circuit 101 to first input point
The voltage of input；The point that second input terminal of voltage comparator circuit 102 is connect with battery pack 104 to be detected is battery to be detected
The voltage detecting point of packet 104, the voltage detecting point of battery pack 104 to be detected are battery pack 104 to be detected to second input
Hold the voltage of input.Pass through the pre- of the voltage detecting point of voltage detecting point and battery pack to be detected 104 to bleeder circuit 101
If setting, may make in the case where the copper bar of battery pack to be detected connects normal situation, the electricity of the voltage detecting point of bleeder circuit 101
Press, i.e. bleeder circuit 101 electricity that first input point inputs equal with the voltage of voltage detecting point of battery pack 104 to be detected
It presses equal with the voltage that battery pack 104 to be detected is inputted to second input terminal.
The voltage that is inputted to the first input end in bleeder circuit 101 and battery pack to be detected 104 are to second input terminal
When the voltage of input is equal, voltage comparator circuit 102 exports zero voltage signal to processing circuit 103, in bleeder circuit 101 to this
When the voltage that the voltage and battery pack to be detected 104 of first input end input are inputted to second input terminal is unequal, voltage ratio
High level signal is exported to processing circuit 103 compared with circuit 102.Processing circuit 103 is used to be determined according to the voltage signal received
The connection status of copper bar, if voltage signal is high voltage signal, the connection status of copper bar is that copper bar connection loosens；If voltage is believed
It number is zero voltage signal, then the connection status of copper bar is that copper bar connection is normal.
The detection circuit of copper bar connection status provided in this embodiment, comprising: bleeder circuit, voltage comparator circuit and processing
Circuit；Wherein, bleeder circuit is in parallel with battery pack to be detected, and bleeder circuit also connects with the first input end of voltage comparator circuit
It connects, the second input terminal of voltage comparator circuit is connect with battery pack to be detected, the output end and processing circuit of voltage comparator circuit
Connection；Voltage comparator circuit, voltage from bleeder circuit to the first input end and battery pack to be detected for being inputted according to this
The voltage of second input terminal input, to processing circuit output voltage signal；The voltage signal is that high level signal or no-voltage are believed
Number；Processing circuit is used to determine the connection status of copper bar according to the voltage signal, if voltage signal is high voltage signal, copper bar
Connection status be copper bar connection loosen；If voltage signal is zero voltage signal, the connection status of copper bar is that copper bar connects just
Often.The voltage of the detection circuit battery pack more to be detected and bleeder circuit in hardware, so that it is determined that battery pack to be detected
Copper bar connection whether loosen, which is not influenced by the voltage and current of battery pack to be detected, under all operating conditions
The connection status that can normally detect copper bar improves the accuracy of copper bar connection status detection.
On the basis of the above embodiments, it is carried out in conjunction with each section of specific example to detection circuit provided by the invention
It illustrates.Fig. 2 provides a kind of structural schematic diagram two of the detection circuit of copper bar connection status for the present invention.As shown in Fig. 2,
101 bleeder circuits include first resistor R1 and second resistance R2；First resistor R1 and second resistance R2 series connection, first resistor R1 with
The anode connection of battery pack 104 to be detected, second resistance R2 are connect with the cathode of battery pack 104 to be detected；First resistor R1 and
The tie point of second resistance R2 is connect with the first input end of voltage comparator circuit 102.
Optionally, the ratio between the resistance value of first resistor R1 and the resistance value of second resistance R2 areWherein, z indicates electricity to be detected
The battery core string number of Chi Bao, the negative side xth string battery core of battery pack 104 to be detected and the second input terminal of voltage comparator circuit 102
Connection.The present embodiment is not construed as limiting the specific value of electricity string number z.
In this case, when the copper bar connection status for detecting battery pack 104 is normal, voltage on second resistance R2 and
The voltage that the negative side first of battery pack 104 to be detected is gone here and there in battery core is equal, i.e. the first input end of voltage detecting circuit and the
The voltage of two input terminals is equal, so that voltage comparator circuit can be according to the voltage output zero of first input end and the second input terminal
Voltage signal, so that processing circuit determines that the copper bar connection of detection battery pack 104 is normal.If the copper bar for detecting battery pack 104 connects
Loosening is connect, copper bar equivalent resistance increases, and battery pack bus current is bigger, then also bigger, the second resistance R2 of the equivalent partial pressure of copper bar
On voltage then can with the negative side first of battery pack 104 to be detected go here and there battery core on voltage it is unequal, so that voltage is more electric
It road can be according to the voltage output high level signal of first input end and the second input terminal, so that processing circuit is receiving the height
It can determine that the copper bar connection of detection battery pack 104 loosens after level signal.
Setting of the present embodiment by the resistance value to the resistance in bleeder circuit and the voltage detecting point to bleeder circuit
With the setting of the voltage detecting point of battery pack to be detected, ensure that when the copper bar connection of battery pack to be detected loosens, voltage ratio
High level signal can be exported by the comparison to battery pack to be detected and the voltage of bleeder circuit compared with circuit, to make processing electricity
Road can determine that the copper bar connection of battery pack to be detected loosens.
Further, since the detection electric appliance of copper bar connection status provided in this embodiment is realized by hardware mode, the detection
Process does not need additional software and calculates, the central processing unit of the system of vehicle where can effectively saving battery pack to be detected
(Central Processing Unit, abbreviation CPU) resource.Meanwhile first comparator IC1 and second when hardware circuit design
The positive input of comparator IC2 is grounded, and reverse input end connects voltage detecting point, in fault-free, first comparator IC1 and the
Two comparator IC2, can be with the energy saving of higher efficiency without output.
On the basis of the above embodiments, with continued reference to Fig. 2, voltage comparator circuit 102 include: first comparator IC1 and
Second comparator IC2.
Wherein, the reverse input end of first comparator IC1 is connect with bleeder circuit 101, and the second comparator IC2's is reversed defeated
Enter end to connect with battery pack 104 to be detected；The positive input of the positive input of first comparator IC1 and the second comparator IC2
End ground connection；It is defeated with processing circuit 103 again after the connection of the output end of the output end of first comparator IC1 and the second comparator IC2
Enter end connection.The reverse input end of first comparator IC1 can be the first input end in above-described embodiment, the second comparator
The reverse input end of IC2 can be the second input terminal in above-described embodiment.
First comparator IC1, when being less than the voltage of battery pack 104 to be detected for the voltage in bleeder circuit 101, to place
It manages circuit 103 and exports high level signal, alternatively, when the voltage of bleeder circuit 101 is equal to the voltage of battery pack 104 to be detected,
Zero voltage signal is exported to processing circuit 103.
Second comparator IC2, when being greater than the voltage of battery pack 104 to be detected for the voltage in bleeder circuit 101, to place
It manages circuit 103 and exports high level signal, alternatively, when the voltage of bleeder circuit 101 is equal to the voltage of battery pack 104 to be detected,
Zero voltage signal is exported to processing circuit 103.
Optionally, voltage comparator circuit 102 further includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8.
Wherein, 3rd resistor R3 is connect with the reverse input end of first comparator IC1 and bleeder circuit 101 respectively；
The 4th resistance R4 positive input with the reverse input end of first comparator IC1 and the second comparator IC2 respectively
Connection；
5th resistance R5 is connect with the positive input of the second comparator IC2 and grounding point respectively；
6th resistance R6 is connect with the reverse input end of the second comparator IC2 and battery pack to be detected 104 respectively；
The 7th resistance R7 reverse input end with the positive input of first comparator IC1 and the second comparator IC2 respectively
Connection；
8th resistance R8 is connect with the positive input of first comparator IC1 and grounding point respectively；
The resistance value of 3rd resistor R3 is equal to the resistance value of the 6th resistance R6, and the resistance value of the 4th resistance R4 is equal to the 7th resistance R7's
Resistance value, the resistance value of the 5th resistance R5 are equal to the resistance value of the 8th resistance R8.
In above-described embodiment, when the copper bar connection status for detecting battery pack 104 is normal, voltage on second resistance R2 and
The voltage that the negative side first of battery pack 104 to be detected is gone here and there in battery core is equal, i.e. the first input end of voltage detecting circuit and the
The voltage of two input terminals is equal.The positive input of first comparator IC1 and the voltage of reverse input end are equal, the second comparator
The positive input and reverse input end voltage of IC2 is equal, therefore the output letter of first comparator IC1 and the second comparator IC2
It number is zero voltage signal, processing circuit 103 can determine that copper bar connection is normal according to zero voltage signal.
It is loosened if the copper bar for detecting battery pack 104 connects, copper bar equivalent resistance increases, and bus current is bigger, then copper bar
Equivalent partial pressure is also bigger, and the voltage on second resistance R2 can then go here and there in battery core with the negative side first of battery pack 104 to be detected
Voltage is unequal, in the voltage that the negative side first that the voltage on second resistance R2 is greater than battery pack 104 to be detected is gone here and there in battery core
When, the second comparator IC2 exports high level signal, and processing circuit 103 can determine that copper bar connection is loosened according to the high level signal；
When the negative side first that the voltage on second resistance R2 is less than battery pack 104 to be detected goes here and there the voltage in battery core, first compares
Device IC1 exports high level signal, and processing circuit 103 can determine that copper bar connection is loosened according to the high level signal.
Voltage comparator circuit in above-described embodiment, by first comparator and the second comparator in bleeder circuit and to be checked
It surveys under the unequal different situations of voltage of battery pack, can determine that copper bar connection loosens, improve the detection of copper bar connection status
Accuracy.
On the basis of the various embodiments described above, which may also include reverse-connection preventing circuit 105.
Reverse-connection preventing circuit 105 is connect with voltage comparator circuit 102 and processing circuit 103 respectively；
Reverse-connection preventing circuit 105 is used to prevent electricity when voltage comparator circuit 102 is to 103 output voltage signal of processing circuit
Stream is reversed.
Specifically, reverse-connection preventing circuit 105 includes first diode D1 and the second diode D2 referring to shown in Fig. 2；Wherein,
First diode D1 is connect with first comparator IC1 and processing circuit IC1 respectively, the second diode D2 respectively with the second comparator
IC2 and processing circuit 103 connect.
Optionally, detection circuit may also include optocoupler IC3.
The anode of the transmitting terminal of optocoupler IC3 is connect with the output end of voltage comparator circuit 102, the transmitting terminal of optocoupler IC3
Cathode is connect with the cathode of battery pack 104 to be detected, the collector of the receiving end of optocoupler IC3 and the input terminal of processing circuit 104
Connection, the transmitter ground connection of the receiving end of optocoupler IC3.
Specifically, with continued reference to shown in Fig. 2, the anode of the transmitting terminal of optocoupler IC3, the i.e. pin 1 of optocoupler IC3, with voltage
The output end of comparison circuit 102 passes through the 9th resistance R9 connection；The cathode of the transmitting terminal of optocoupler IC3, the i.e. pin 3 of optocoupler IC3,
It is connect with the cathode of battery pack 104 to be detected；The collector of the receiving end of optocoupler IC3, the i.e. pin 2 of optocoupler IC3, with processing electricity
The input terminal on road 104 connects；The pin 4 of the emitter of the receiving end of optocoupler IC3, i.e. optocoupler IC3 is grounded.
When the output end of voltage comparator circuit 102 exports high level signal, optocoupler IC3 work, the pin 2 of optocoupler IC3
High level signal is exported to processing circuit 103, processing circuit 103 determines battery pack to be detected according to the high level signal received
Copper bar connection status be copper bar connection loosen；When the output end of voltage comparator circuit 102 exports zero voltage signal, optocoupler
IC3 does not work, thus the connection status that processing circuit 103 determines the copper bar of battery pack to be detected according to zero voltage signal is received
It is normal for copper bar connection.
In addition, as shown in Fig. 2, further include isolated power supply IC4 in the detection circuit of the present embodiment, the one of isolated power supply IC4
Side anode connects first comparator IC1, is that first comparator IC1 and the second comparator IC2 powers, isolated power supply IC4's is another
Side anode is connect by the tenth resistance R10 with the collector of the receiving end of optocoupler IC3, while the other side of isolated power supply IC4 is just
Pole is also connect with processing circuit 103.Processing circuit 103 can be processing chip, such as can be micro-control unit
(Microcontroller Unit, abbreviation MCU) IC5.Input terminal, that is, MCU input/output (I/O) of processing circuit 103 is held
Mouthful, the power supply of processing circuit 103 can be 5V.
Below in conjunction with Fig. 2 to the detection circuit of copper bar connection status provided by the embodiment battery pack to be detected different works
The course of work under condition is illustrated.Specifically with the string battery core of negative side first of battery pack to be detected with the second comparator IC2's
It is illustrated for reverse input end connection, i.e. x in above-described embodiment is equal to 1.
A, b, n indicate the copper bar in battery pack to be detected in Fig. 2, and the copper bar quantity in battery pack to be detected is n, mould group number
Amount is n+1, and battery core string number is z, and the present embodiment is not construed as limiting the particular number of n and z.+ M is positive bus-bar, and-M is negative busbar, A
Point is the voltage detecting point of the string battery core of negative side first of battery pack to be detected, and A point voltage is UA, B point is bleeder circuit 101
Voltage detecting point, B point voltage are UB, C point is the voltage detecting point of the positive grade bus of battery pack to be detected, and C point voltage is UC, D point is
The voltage detecting point of the reverse input end of first comparator IC1, D point voltage are UD, E point is the positive defeated of the second comparator IC2
Enter the voltage detecting point at end, E point voltage is UE, F point is the voltage detecting point of the reverse input end of the second comparator IC2, F point electricity
Pressure is UF, G point is the voltage detecting point of the positive input of first comparator IC1, and G point voltage is UG；Bus current is I, copper bar
Equivalent resistance is R.
Work as I=0, i.e., when the vehicle where battery pack to be detected does not go up high-voltage electricity, if copper bar connection is normal, due to R1=
(z-1)R2, equivalent partial pressure U on copper barRIt is 0, Cause
For UB=A, then UD=F, UE=G, i.e. UD=G, UE=F, the positive input of first comparator IC1 and the second comparator IC2 at this time
It is equal with reverse input end voltage value, first comparator IC1 and the second comparator IC2 output is zero voltage signal without defeated
Out, so that optocoupler does not work, the input of MCU is zero voltage signal, can determine that the copper bar connection of battery pack to be detected is normal.If copper
Row's connection loosens, then will lead to UB<UA, then UD< UG, UE< UF, the second comparator IC2 output zero voltage signal, the first ratio
High level signal is exported compared with device IC1, so that optocoupler works, MCU receives high level signal, determines the copper bar of battery pack to be detected
Connection loosens.
Likewise, in I < 0, i.e., vehicle where battery pack to be detected is in charged state or I > 0, i.e., to be detected
Vehicle where battery pack is in discharge condition, if the copper bar connection of battery pack to be detected is normal, UB=A, first comparator
The positive input of IC1 and the second comparator IC2 is equal with reverse input end voltage value, the ratio of first comparator IC1 and second
Be zero voltage signal without output compared with device IC2 output, so that optocoupler does not work, the input of MCU is zero voltage signal, can determine that
The copper bar connection for detecting battery pack is normal.
And if the copper bar of battery pack to be detected connects when loosening, process difference of the detection circuit under different operating conditions.
As I < 0, UR=IR, because electric current I is negative value at this time, and electric current I is more significantly, the equivalent partial pressure U of copper barRAlso it gets over
Greatly, voltageDue to UB> UA, therefore UD> UF> UG, the reversed input of first comparator IC1 at this time
The voltage at end is greater than the voltage of positive input, and first comparator IC1 exports zero voltage signal.Due to Work as R4When close to infinitesimal, UD≈UE,
Work as R4When close to infinity, UD≈UB, therefore, can be by setting R4Different resistance value, to be arranged the second comparator IC2's
Comparison range, i.e. alarm threshold value.If R is arranged4For infinitesimal, UE≈UD> UF, the second comparator IC2 output high level, optocoupler work
Make, MCU receives high level, can determine that the copper bar connection of battery pack to be detected loosens.
As I > 0, UR=IR, electric current I is positive value at this time, and electric current I is bigger, the equivalent partial pressure U of copper barRAlso bigger, electricity
PressureDue to UB< UA, then UE< UD< UF, the reverse input end of the second comparator IC2 is greater than at this time
Positive input is not turned on.Due to Work as R7When close to infinitesimal, UF≈UG, work as R7When close to infinity, UF≈UA, therefore, can be by setting R7It is different
Resistance value, the comparison range of first comparator IC1, i.e. alarm threshold value is arranged.If R is arranged7For infinitesimal, UF≈UG> UD, this
When first comparator IC1 export high level signal, optocoupler work, MCU receives high level signal, can determine that battery pack to be detected
Copper bar connect loosen.
From above-described embodiment as can be seen that the detection circuit of copper bar connection status provided by the invention is in battery pack to be detected
It can correctly be detected under various operating conditions, according to the difference of the resistance value in voltage comparator circuit, difference can be set
Voltage comparison range.The course of work of detection circuit does not require the size of electric current, even if electric current or electricity in detection process
Pressure changes, and will not influence the accuracy of testing result, simultaneously because passing through the resistance value of setting resistance in the detection circuit
It can determine the comparison range of voltage, therefore can be to avoid the voltage error in judgement under different operating conditions.
Fig. 3 is a kind of structural schematic diagram of power-supply system provided by the invention.As shown in figure 3, the power-supply system 30 includes
The detection circuit 302 of battery pack 301 and copper bar connection status to be detected, wherein battery pack 301 and copper bar connection status to be detected
Detection circuit 302 connect.
The detection circuit 302 of copper bar connection status is used to detect the connection status of the copper bar in battery pack to be detected；Copper bar
The detection circuit 302 of connection status is any detection circuit in above embodiments.
A kind of vehicle can also be provided in the present invention, which includes the power-supply system of embodiment illustrated in fig. 3.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of detection circuit of copper bar connection status, which is characterized in that the detection circuit includes: bleeder circuit, voltage ratio
Compared with circuit and processing circuit；
Wherein, the bleeder circuit is in parallel with battery pack to be detected, the bleeder circuit also with the voltage comparator circuit
The connection of one input terminal, the second input terminal of the voltage comparator circuit are connect with the battery pack to be detected, and the voltage compares
The output end of circuit is connect with the processing circuit；
The voltage comparator circuit, voltage for being inputted according to from the bleeder circuit to the first input end and described to be checked
Survey the voltage that battery pack is inputted to second input terminal, Xiang Suoshu processing circuit output voltage signal；The voltage signal is
High level signal or zero voltage signal；
The processing circuit is used to determine the connection status of copper bar according to the voltage signal, if the voltage signal is high voltage
Signal, then the connection status of the copper bar is that copper bar connection loosens；If the voltage signal is zero voltage signal, the copper bar
Connection status be that copper bar connection is normal.
2. detection circuit according to claim 1, which is characterized in that the bleeder circuit includes first resistor and the second electricity
Resistance；The first resistor and second resistance series connection, the first resistor are connect with the anode of the battery pack to be detected, institute
Second resistance is stated to connect with the cathode of the battery pack to be detected；
The tie point of the first resistor and the second resistance is connect with the first input end of the voltage comparator circuit.
3. detection circuit according to claim 2, which is characterized in that the resistance value of the first resistor and the second resistance
The ratio between resistance value beWherein, z indicates the battery core string number of battery pack to be detected, the negative side xth of the battery pack to be detected
String battery core is connect with the second input terminal of the voltage comparator circuit.
4. detection circuit according to claim 1, which is characterized in that the voltage comparator circuit includes: first comparator
With the second comparator；
Wherein, the reverse input end of the first comparator is connect with the bleeder circuit,
The reverse input end of second comparator is connect with the battery pack to be detected；The positive input of the first comparator
The positive input of end and second comparator is grounded；The output end of the first comparator and second comparator it is defeated
It is connect again with the input terminal of the processing circuit after outlet connection；
The first comparator, when being less than the voltage of the battery pack to be detected for the voltage in the bleeder circuit, to institute
Processing circuit output high level signal is stated, alternatively, the voltage in the bleeder circuit is greater than or equal to the battery pack to be detected
Voltage when, Xiang Suoshu processing circuit export zero voltage signal；
Second comparator, when being greater than the voltage of the battery pack to be detected for the voltage in the bleeder circuit, to institute
Processing circuit output high level signal is stated, alternatively, the voltage in the bleeder circuit is less than or equal to the battery pack to be detected
Voltage when, Xiang Suoshu processing circuit export zero voltage signal.
5. detection circuit according to claim 4, which is characterized in that the voltage comparator circuit further include 3rd resistor,
4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance；
Wherein, the 3rd resistor is connect with the reverse input end of the first comparator and the bleeder circuit respectively；
4th resistance positive input with the reverse input end of the first comparator and second comparator respectively
Connection；
5th resistance is connect with the positive input of second comparator and grounding point respectively；
6th resistance is connect with the reverse input end of second comparator and the battery pack to be detected respectively；
7th resistance reverse input end with the positive input of the first comparator and second comparator respectively
Connection；
8th resistance is connect with the positive input of the first comparator and grounding point respectively；
The resistance value of the 3rd resistor is equal to the resistance value of the 6th resistance, and the resistance value of the 4th resistance is equal to the 7th electricity
The resistance value of resistance, the resistance value of the 5th resistance are equal to the resistance value of the 8th resistance.
6. detection circuit according to claim 4, which is characterized in that the detection circuit further includes reverse-connection preventing circuit；
The reverse-connection preventing circuit is connect with the voltage comparator circuit and the processing circuit respectively；
The reverse-connection preventing circuit is used to prevent electric current reversed when bleeder circuit is to the processing circuit output voltage signal.
7. detection circuit according to claim 6, which is characterized in that the reverse-connection preventing circuit includes first diode and
Two diodes；
Wherein, first diode is connect with the first comparator and the processing circuit respectively, the second diode difference
It is connect with second comparator and the processing circuit.
8. detection circuit according to claim 1-6, which is characterized in that the detection circuit further includes optocoupler；
The anode of the transmitting terminal of the optocoupler is connect with the output end of the voltage comparator circuit, and the transmitting terminal of the optocoupler is born
Pole is connect with the cathode of the battery pack to be detected, the input terminal of the collector of the receiving end of the optocoupler and the processing circuit
Connection, the emitter ground connection of the receiving end of the optocoupler.
9. a kind of power-supply system, which is characterized in that the detection circuit including battery pack to be detected and copper bar connection status, wherein
The battery pack to be detected is connected with the detection circuit of copper bar connection status；
Connection status of the detection circuit of the copper bar connection status for the copper bar in the detection battery pack to be detected；It is described
The detection circuit of copper bar connection status is the described in any item detection circuits of claim 1-8.
10. a kind of vehicle, which is characterized in that including power-supply system as claimed in claim 9.
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| CN201910470252.3A CN110187286B (en) | 2019-05-31 | 2019-05-31 | Detection circuitry, electrical power generating system and vehicle of copper bar connection status |
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| CN201910470252.3A CN110187286B (en) | 2019-05-31 | 2019-05-31 | Detection circuitry, electrical power generating system and vehicle of copper bar connection status |
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| CN110716149A (en) * | 2019-10-12 | 2020-01-21 | 深圳中科新能源汽车技术有限公司 | Battery voltage calculation method for battery system cross-over connection copper bar |
| CN113820616A (en) * | 2020-06-02 | 2021-12-21 | 广州汽车集团股份有限公司 | Battery monitoring method and system, battery management system and vehicle |
| CN113960500A (en) * | 2021-08-24 | 2022-01-21 | 欣旺达电子股份有限公司 | Detection circuit, detection system and detection method |
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| CN110187286B (en) | 2021-09-14 |
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