CN110187286B - Detection circuitry, electrical power generating system and vehicle of copper bar connection status - Google Patents
Detection circuitry, electrical power generating system and vehicle of copper bar connection status Download PDFInfo
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- CN110187286B CN110187286B CN201910470252.3A CN201910470252A CN110187286B CN 110187286 B CN110187286 B CN 110187286B CN 201910470252 A CN201910470252 A CN 201910470252A CN 110187286 B CN110187286 B CN 110187286B
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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
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Abstract
The invention provides a detection circuit for a copper bar connection state, a power supply system and a vehicle. The detection circuit includes: the voltage divider circuit, the voltage comparison circuit and the processing circuit; the voltage division circuit is connected with the battery pack to be detected in parallel, the voltage division circuit is also connected with a first input end of the voltage comparison circuit, a second input end of the voltage comparison circuit is connected with the battery pack to be detected, and an output end of the voltage comparison circuit is connected with the processing circuit; the voltage comparison circuit is used for outputting a voltage signal to the processing circuit according to the voltage input by the voltage dividing circuit to the first input end and the voltage input by the battery pack to be detected to the second input end; the voltage signal is a high level signal or a zero voltage signal; the processing circuit is used for determining the connection state of the copper bar according to the voltage signal. The detection circuit improves the accuracy of the detection of the connection state of the copper bar.
Description
Technical Field
The invention relates to a power supply technology, in particular to a detection circuit for a copper bar connection state, a power supply system and a vehicle.
Background
With the rapid development of new energy vehicles, the power battery pack is used as the most important power output in the vehicle, and needs to have very high reliability to ensure the stable operation of the vehicle. At present, the connection of module all adopts the copper bar to tighten the mode of bolt and carries out electrical connection in the power battery package, when battery packing is fit for the time, can tighten the bolt according to established moment of torsion, but because later stage vehicle operation operating mode is complicated, probably leads to the bolt not hard up to it is not hard up to make the copper bar connect. Therefore, the state of the battery pack needs to be monitored constantly, so that corresponding processing can be timely performed when the copper bar is connected and loosened.
Among the prior art, adopt software comparison method to detect the connection situation between each module in the power battery package usually, copper bar voltage is gathered to concrete accessible to carry out the method of comparison with the voltage of gathering, under different operating modes, the difference of electric current can lead to the voltage of gathering different, consequently requires highly to the real-time of the voltage of gathering, and need carry out long-time detection, just can be correct detection under stable heavy current operating mode.
Therefore, when the connection state of the modules in the power battery pack is detected by adopting the detection mode of the existing software comparison method, the detection accuracy is not high.
Disclosure of Invention
The invention provides a detection circuit for a copper bar connection state, a power supply system and a vehicle, which are used for improving the accuracy of detection of the copper bar connection state.
The invention provides a detection circuit for the connection state of a copper bar, which comprises: the voltage divider circuit, the voltage comparison circuit and the processing circuit;
the voltage dividing circuit is connected with the battery pack to be detected in parallel, the voltage dividing circuit is also connected with the first input end of the voltage comparison circuit, the second input end of the voltage comparison circuit is connected with the battery pack to be detected, and the output end of the voltage comparison circuit is connected with the processing circuit;
the voltage comparison circuit is used for outputting a voltage signal to the processing circuit according to the voltage input to the first input end by the voltage division circuit and the voltage input to the second input end by the battery pack to be detected; the voltage signal is a high level signal or a zero voltage signal;
the processing circuit is used for determining the connection state of the copper bar according to the voltage signal, and if the voltage signal is a high voltage signal, the connection state of the copper bar is that the copper bar is loose; if the voltage signal is a zero voltage signal, the connection state of the copper bar is that the copper bar is normally connected.
Optionally, the voltage divider circuit includes a first resistor and a second resistor; the first resistor and the second resistor are connected in series, the first resistor is connected with the anode of the battery pack to be detected, and the second resistor is connected with the cathode of the battery pack to be detected;
the connection point of the first resistor and the second resistor is connected with the first input end of the voltage comparison circuit.
Optionally, the resistance of the first resistor and the second resistorThe ratio of the resistance values of the resistors is
Wherein, z is
And displaying the number of the cell strings of the battery pack to be detected, wherein the x-th cell at the negative electrode side of the battery pack to be detected is connected with the second input end of the voltage comparison circuit.
Optionally, the voltage comparison circuit includes: a first comparator and a second comparator;
wherein the inverting input terminal of the first comparator is connected to the voltage dividing circuit,
the reverse input end of the second comparator is connected with the battery pack to be detected; the positive input end of the first comparator and the positive input end of the second comparator are grounded; the output end of the first comparator is connected with the output end of the second comparator and then connected with the input end of the processing circuit;
the first comparator is used for outputting a high-level signal to the processing circuit when the voltage of the voltage division circuit is less than the voltage of the battery pack to be detected, or outputting a zero-voltage signal to the processing circuit when the voltage of the voltage division circuit is greater than or equal to the voltage of the battery pack to be detected;
the second comparator is used for outputting a high-level signal to the processing circuit when the voltage of the voltage division circuit is greater than the voltage of the battery pack to be detected, or outputting a zero-voltage signal to the processing circuit when the voltage of the voltage division circuit is less than or equal to the voltage of the battery pack to be detected.
Optionally, the voltage comparison circuit further includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the third resistor is respectively connected with the reverse input end of the first comparator and the voltage division circuit;
the fourth resistor is respectively connected with the reverse input end of the first comparator and the positive input end of the second comparator;
the fifth resistor is respectively connected with the positive input end of the second comparator and the grounding point;
the sixth resistor is respectively connected with the reverse input end of the second comparator and the battery pack to be detected;
the seventh resistor is respectively connected with the positive input end of the first comparator and the reverse input end of the second comparator;
the eighth resistor is respectively connected with the positive input end of the first comparator and the grounding point;
the resistance of the third resistor is equal to the resistance of the sixth resistor, the resistance of the fourth resistor is equal to the resistance of the seventh resistor, and the resistance of the fifth resistor is equal to the resistance of the eighth resistor.
Optionally, the detection circuit further comprises an anti-reverse connection circuit;
the reverse connection preventing circuit is respectively connected with the voltage comparing circuit and the processing circuit;
the reverse connection preventing circuit is used for preventing current from reversing when the voltage dividing circuit outputs a voltage signal to the processing circuit.
Optionally, the reverse connection prevention circuit includes a first diode and a second diode;
the first diode is respectively connected with the first comparator and the processing circuit, and the second diode is respectively connected with the second comparator and the processing circuit.
Optionally, the detection circuit further includes an optocoupler;
the positive pole of the transmitting end of the optical coupler is connected with the output end of the voltage comparison circuit, the negative pole of the transmitting end of the optical coupler is connected with the negative pole of a battery pack to be detected, the collector of the receiving end of the optical coupler is connected with the input end of the processing circuit, and the emitter of the receiving end of the optical coupler is grounded.
The invention provides a power supply system which comprises a detection circuit for detecting the connection state of a battery pack and a copper bar, wherein the detection circuit for detecting the connection state of the battery pack and the copper bar is connected;
the detection circuit of the copper bar connection state is used for detecting the connection state of the copper bar in the battery pack to be detected; the detection circuit of the copper bar connection state is the detection circuit in any one of the above.
The invention provides a vehicle including the power supply system.
The invention provides a detection circuit for copper bar connection state, a power supply system and a vehicle, wherein the detection circuit comprises: the voltage divider circuit, the voltage comparison circuit and the processing circuit; the voltage dividing circuit is connected with the battery pack to be detected in parallel, the voltage dividing circuit is also connected with a first input end of the voltage comparison circuit, a second input end of the voltage comparison circuit is connected with the battery pack to be detected, and an output end of the voltage comparison circuit is connected with the processing circuit; the voltage comparison circuit is used for outputting a voltage signal to the processing circuit according to the voltage input by the voltage dividing circuit to the first input end and the voltage input by the battery pack to be detected to the second input end; the voltage signal is a high level signal or a zero voltage signal; the processing circuit is used for determining the connection state of the copper bar according to the voltage signal, and if the voltage signal is a high voltage signal, the connection state of the copper bar is that the copper bar is loose; if the voltage signal is a zero voltage signal, the connection state of the copper bar is that the copper bar is normally connected. This detection circuitry treats battery package and bleeder circuit's voltage with hardware mode comparison to whether the copper bar that confirms to treat battery package is connected and is become flexible, this detection circuitry does not receive the influence of the voltage and the electric current of treating the battery package, and the connection status of all normal detection copper bars has improved the accuracy that the copper bar connection status detected under all operating modes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a detection circuit for detecting a copper bar connection state according to the present invention;
fig. 2 is a schematic structural diagram ii of a detection circuit for detecting a connection state of a copper bar according to the present invention;
fig. 3 is a schematic structural diagram of a power supply system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a detection circuit for detecting a connection state of a copper bar according to the present invention. As shown in fig. 1, the circuit for detecting the connection state of the copper bar may include: a voltage dividing circuit 101, a voltage comparing circuit 102, and a processing circuit 103.
The voltage dividing circuit 101 is connected in parallel with the battery pack 104 to be detected, the voltage dividing circuit 101 is further connected with a first input end of the voltage comparing circuit 102, a second input end of the voltage comparing circuit 102 is connected with the battery pack 104 to be detected, and an output end of the voltage comparing circuit 102 is connected with the processing circuit 103.
A voltage comparison circuit 102, configured to output a voltage signal to the processing circuit 103 according to the voltage input to the first input end by the voltage division circuit 101 and the voltage input to the second input end by the battery pack to be detected 104; the voltage signal is a high level signal or a zero voltage signal.
The processing circuit 103 is used for determining the connection state of the copper bar according to the voltage signal, and if the voltage signal is a high voltage signal, the connection state of the copper bar is that the copper bar is loose; if the voltage signal is a zero voltage signal, the connection state of the copper bar is that the copper bar is normally connected.
In this embodiment, a point at which the voltage dividing circuit 101 is connected to the first input end of the voltage comparing circuit 102 is a voltage detecting point of the voltage dividing circuit 101, and a voltage at the voltage detecting point of the voltage dividing circuit 101 is a voltage input by the voltage dividing circuit 101 to the first input point; the point at which the second input terminal of the voltage comparison circuit 102 is connected to the battery pack 104 to be detected is a voltage detection point of the battery pack 104 to be detected, and the voltage detection point of the battery pack 104 to be detected is a voltage input by the battery pack 104 to be detected to the second input terminal. Through the preset arrangement of the voltage detection point of the voltage division circuit 101 and the voltage detection point of the battery pack 104 to be detected, under the condition that the copper bar of the battery pack to be detected is normally connected, the voltage of the voltage detection point of the voltage division circuit 101 is equal to the voltage of the voltage detection point of the battery pack 104 to be detected, namely, the voltage input to the first input point by the voltage division circuit 101 is equal to the voltage input to the second input end by the battery pack 104 to be detected.
When the voltage input to the first input end by the voltage dividing circuit 101 is equal to the voltage input to the second input end by the battery pack 104 to be detected, the voltage comparing circuit 102 outputs a zero-voltage signal to the processing circuit 103, and when the voltage input to the first input end by the voltage dividing circuit 101 is not equal to the voltage input to the second input end by the battery pack 104 to be detected, the voltage comparing circuit 102 outputs a high-level signal to the processing circuit 103. The processing circuit 103 is used for determining the connection state of the copper bar according to the received voltage signal, and if the voltage signal is a high voltage signal, the connection state of the copper bar is that the copper bar is loose; if the voltage signal is a zero voltage signal, the connection state of the copper bar is that the copper bar is normally connected.
The detection circuitry of copper bar connection status that this embodiment provided includes: the voltage divider circuit, the voltage comparison circuit and the processing circuit; the voltage dividing circuit is connected with the battery pack to be detected in parallel, the voltage dividing circuit is also connected with a first input end of the voltage comparison circuit, a second input end of the voltage comparison circuit is connected with the battery pack to be detected, and an output end of the voltage comparison circuit is connected with the processing circuit; the voltage comparison circuit is used for outputting a voltage signal to the processing circuit according to the voltage input by the voltage dividing circuit to the first input end and the voltage input by the battery pack to be detected to the second input end; the voltage signal is a high level signal or a zero voltage signal; the processing circuit is used for determining the connection state of the copper bar according to the voltage signal, and if the voltage signal is a high voltage signal, the connection state of the copper bar is that the copper bar is loose; if the voltage signal is a zero voltage signal, the connection state of the copper bar is that the copper bar is normally connected. This detection circuitry treats battery package and bleeder circuit's voltage with hardware mode comparison to whether the copper bar that confirms to treat battery package is connected and is become flexible, this detection circuitry does not receive the influence of the voltage and the electric current of treating the battery package, and the connection status of all normal detection copper bars has improved the accuracy that the copper bar connection status detected under all operating modes.
On the basis of the above embodiments, the parts of the detection circuit provided by the present invention are exemplified with reference to specific examples. Fig. 2 is a schematic structural diagram of a detection circuit for detecting a connection state of a copper bar according to the present invention. As shown in fig. 2, the 101 voltage dividing circuit includes a first resistor R1 and a second resistor R2; the first resistor R1 and the second resistor R2 are connected in series, the first resistor R1 is connected with the positive pole of the battery pack 104 to be detected, and the second resistor R2 is connected with the negative pole of the battery pack 104 to be detected; a connection point of the first resistor R1 and the second resistor R2 is connected to a first input terminal of the voltage comparison circuit 102.
Optionally, the ratio of the resistance of the first resistor R1 to the resistance of the second resistor R2 is
Wherein z represents the number of cell strings of the battery pack to be detected, and the x-th cell string at the negative electrode side of the battery pack 104 to be detected is connected with the second input end of the voltage comparison circuit 102. The present embodiment does not limit the specific value of the electrical string number z.
Under this condition, when the copper bar connection state that detects battery package 104 is normal, the voltage on second resistance R2 is equal to the voltage on the first string of electric core of the negative pole side of waiting to detect battery package 104, and the voltage of voltage detection circuit's first input and second input is equal promptly to voltage comparison circuit can be according to the voltage output zero voltage signal of first input and second input, makes processing circuit confirm that the copper bar connection that detects battery package 104 is normal. If the copper bar connection that detects battery package 104 is not hard up, the copper bar equivalent resistance increase, and battery package bus current is big more, then the copper bar equivalent partial pressure is also big more, voltage on the second resistance R2 then can with wait to detect the voltage inequality on the first string of electric core of negative pole side of battery package 104, thereby voltage comparison circuit can be according to the voltage output high level signal of first input and second input, make processing circuit can confirm after receiving this high level signal that the copper bar connection that detects battery package 104 is not hard up.
This embodiment has guaranteed to wait when waiting to detect the copper bar connection of battery package not hard up through the settlement of the resistance among the voltage divider circuit and the voltage detection point of voltage divider circuit and waiting to detect the voltage detection point of battery package, and voltage comparison circuit can be through waiting to detect the comparison output high level signal of battery package and voltage divider circuit's voltage to it is not hard up to make processing circuit can confirm to wait to detect the copper bar connection of battery package.
In addition, because the detection electrical apparatus of the copper bar connection state that this embodiment provided is realized through the hardware mode, this testing process does not need extra software to calculate, can effectually practice thrift the Central Processing Unit (CPU) resource of the system of the vehicle that waits to detect the battery package and locate. Meanwhile, when the hardware circuit is designed, the positive input ends of the first comparator IC1 and the second comparator IC2 are grounded, the negative input ends are connected with the voltage detection point, and when no fault exists, the first comparator IC1 and the second comparator IC2 do not output, so that energy can be saved with higher efficiency.
On the basis of the above embodiment, with continued reference to fig. 2, the voltage comparison circuit 102 includes: a first comparator IC1 and a second comparator IC 2.
The reverse input end of the first comparator IC1 is connected with the voltage division circuit 101, and the reverse input end of the second comparator IC2 is connected with the battery pack 104 to be detected; the positive input of the first comparator IC1 and the positive input of the second comparator IC2 are grounded; the output of the first comparator IC1 is connected to the output of the second comparator IC2 and then to the input of the processing circuit 103. The inverting input of the first comparator IC1 may be the first input in the above-described embodiment, and the inverting input of the second comparator IC2 may be the second input in the above-described embodiment.
The first comparator IC1 is configured to output a high-level signal to the processing circuit 103 when the voltage of the voltage dividing circuit 101 is less than the voltage of the battery pack 104 to be detected, or output a zero-voltage signal to the processing circuit 103 when the voltage of the voltage dividing circuit 101 is equal to the voltage of the battery pack 104 to be detected.
And a second comparator IC2 for outputting a high level signal to the processing circuit 103 when the voltage of the voltage dividing circuit 101 is greater than the voltage of the battery pack 104 to be detected, or outputting a zero voltage signal to the processing circuit 103 when the voltage of the voltage dividing circuit 101 is equal to the voltage of the battery pack 104 to be detected.
Optionally, the voltage comparison circuit 102 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.
The third resistor R3 is respectively connected to the inverting input terminal of the first comparator IC1 and the voltage divider circuit 101;
the fourth resistor R4 is respectively connected with the inverting input terminal of the first comparator IC1 and the positive input terminal of the second comparator IC 2;
the fifth resistor R5 is respectively connected with the positive input end of the second comparator IC2 and the grounding point;
the sixth resistor R6 is respectively connected with the reverse input end of the second comparator IC2 and the battery pack 104 to be detected;
the seventh resistor R7 is respectively connected with the positive input terminal of the first comparator IC1 and the negative input terminal of the second comparator IC 2;
the eighth resistor R8 is connected to the positive input terminal of the first comparator IC1 and the ground point, respectively;
the resistance of the third resistor R3 is equal to the resistance of the sixth resistor R6, the resistance of the fourth resistor R4 is equal to the resistance of the seventh resistor R7, and the resistance of the fifth resistor R5 is equal to the resistance of the eighth resistor R8.
In the above embodiment, when the connection state of the copper bar of the battery pack 104 is detected to be normal, the voltage across the second resistor R2 is equal to the voltage across the first string of battery cells on the negative electrode side of the battery pack 104 to be detected, that is, the voltages across the first input end and the second input end of the voltage detection circuit are equal. The voltages of the positive input end and the negative input end of the first comparator IC1 are equal, and the voltages of the positive input end and the negative input end of the second comparator IC2 are equal, so that the output signals of the first comparator IC1 and the second comparator IC2 are zero-voltage signals, and the processing circuit 103 can determine that the copper bar connection is normal according to the zero-voltage signals.
If the copper bar connection of the battery pack 104 is loose, the equivalent resistance of the copper bar is increased, and the bus current is larger, the equivalent voltage division of the copper bar is larger, the voltage on the second resistor R2 is unequal to the voltage on the first string of battery cells on the negative side of the battery pack 104 to be detected, when the voltage on the second resistor R2 is larger than the voltage on the first string of battery cells on the negative side of the battery pack 104 to be detected, the second comparator IC2 outputs a high level signal, and the processing circuit 103 can determine the loose connection of the copper bar according to the high level signal; when the voltage of the second resistor R2 is less than the voltage of the first string of battery cells on the negative side of the battery pack 104 to be detected, the first comparator IC1 outputs a high level signal, and the processing circuit 103 can determine that the copper bar is loose in connection according to the high level signal.
The voltage comparison circuit in the above embodiment can determine that the copper bar is connected loosely through the first comparator and the second comparator under different conditions that the voltage of the voltage division circuit and the voltage of the battery pack to be detected are unequal, so that the accuracy of detection of the connection state of the copper bar is improved.
On the basis of the above embodiments, the detection circuit may further include an anti-reverse connection circuit 105.
The reverse connection preventing circuit 105 is respectively connected with the voltage comparing circuit 102 and the processing circuit 103;
the reverse connection preventing circuit 105 is used to prevent the current from reversing when the voltage comparing circuit 102 outputs the voltage signal to the processing circuit 103.
Specifically, referring to fig. 2, the reverse connection prevention circuit 105 includes a first diode D1 and a second diode D2; the first diode D1 is connected to the first comparator IC1 and the processing circuit IC1, and the second diode D2 is connected to the second comparator IC2 and the processing circuit 103.
Optionally, the detection circuit may further include an optocoupler IC 3.
The positive pole of the transmitting end of the optical coupler IC3 is connected with the output end of the voltage comparison circuit 102, the negative pole of the transmitting end of the optical coupler IC3 is connected with the negative pole of the battery pack 104 to be detected, the collector of the receiving end of the optical coupler IC3 is connected with the input end of the processing circuit 104, and the transmitter of the receiving end of the optical coupler IC3 is grounded.
Specifically, as shown in fig. 2, the positive electrode of the emitting end of the optical coupler IC3, that is, pin 1 of the optical coupler IC3, is connected to the output end of the voltage comparison circuit 102 through a ninth resistor R9; a negative electrode of the emitting end of the optical coupler IC3, namely a pin 3 of the optical coupler IC3, is connected with a negative electrode of the battery pack 104 to be detected; a collector at the receiving end of the optical coupler IC3, namely pin 2 of the optical coupler IC3, is connected with the input end of the processing circuit 104; the emitter of the receiving end of the optical coupler IC3, namely pin 4 of the optical coupler IC3, is grounded.
When the output end of the voltage comparison circuit 102 outputs a high-level signal, the optical coupler IC3 works, a pin 2 of the optical coupler IC3 outputs the high-level signal to the processing circuit 103, and the processing circuit 103 determines that the connection state of the copper bar of the battery pack to be detected is loose connection of the copper bar according to the received high-level signal; when the output end of the voltage comparison circuit 102 outputs a zero voltage signal, the optical coupler IC3 does not work, so that the processing circuit 103 determines that the connection state of the copper bar of the battery pack to be detected is normal for the connection of the copper bar according to the received zero voltage signal.
In addition, as shown in fig. 2, the detection circuit of this embodiment further includes an isolation power IC4, one positive electrode of the isolation power IC4 is connected to the first comparator IC1 to supply power to the first comparator IC1 and the second comparator IC2, the other positive electrode of the isolation power IC4 is connected to the collector of the receiving terminal of the optical coupler IC3 through a tenth resistor R10, and the other positive electrode of the isolation power IC4 is further connected to the processing circuit 103. The processing circuit 103 may be a processing chip, and may be, for example, a Micro Controller Unit (MCU) IC 5. The input terminal of the processing circuit 103, i.e. the input/output (I/O) port of the MCU, the power supply of the processing circuit 103 may be 5V.
The working process of the detection circuit for detecting the connection state of the copper bar provided by the embodiment under different working conditions of the battery pack to be detected is described with reference to fig. 2. Specifically, the negative electrode side first string of the battery pack to be detected is connected to the inverting input terminal of the second comparator IC2, that is, x in the above embodiment is equal to 1.
A, b and n in figure 2 represent the copper bars in the battery pack to be detected, the number of the copper bars in the battery pack to be detected is n, and the dieThe number of groups is n +1, the number of cell strings is z, and the specific number of n and z is not limited in this embodiment. M is a positive bus, M is a negative bus, A point is a voltage detection point of a first string of battery cells at the negative side of the battery pack to be detected, and the voltage of the A point is UAPoint B is a voltage detection point of the voltage dividing circuit 101, and point B has a voltage of UBThe point C is a voltage detection point of a positive bus of the battery pack to be detected, and the voltage of the point C is UCPoint D is the voltage detection point of the reverse input end of the first comparator IC1, and the voltage of point D is UDPoint E is the voltage detection point of the positive input terminal of the second comparator IC2, and the point E voltage is UEThe voltage at point F is detected by the voltage at the inverting input terminal of the second comparator IC2, and the voltage at point F is UFThe voltage at the point G is the voltage detection point of the positive input terminal of the first comparator IC1, and the voltage at the point G is UG(ii) a The bus current is I, and the equivalent resistance of the copper bar is R.
When I is 0, when the vehicle that detects the battery package place is not high voltage electricity promptly, if the copper bar is connected normally, because R1＝(z-1)R2Equivalent voltage division U on copper barRIs a non-volatile organic compound (I) with a value of 0,
because of UB＝AThen U isD＝F，UE＝GI.e. UD＝G，UE＝FAt the moment, the voltage values of the forward input end and the reverse input end of the first comparator IC1 and the second comparator IC2 are equal, the output of the first comparator IC1 and the output of the second comparator IC2 are zero voltage signals and have no output, so that the optical coupler does not work, the input of the MCU is zero voltage signals, and the copper bar connection of the battery pack to be detected can be judged to be normal. If the copper bar is loose during connection, the U shape will be formedB<UAThen U isD＜UG，UE＜UFThe second comparator IC2 outputs a zero voltage signal, the first comparator IC1 outputs a high level signal, so that the optical coupler works, the MCU receives the high level signal, and the copper bar connection of the battery pack to be detected is determinedAnd (4) loosening.
Similarly, when I is less than 0, namely the vehicle where the battery pack to be detected is located is in a charging state, or I is more than 0, namely the vehicle where the battery pack to be detected is located is in a discharging state, if the copper bars of the battery pack to be detected are normally connected, U is connectedB＝AThe forward input end and the reverse input end voltage value of the first comparator IC1 and the second comparator IC2 are equal, the output of the first comparator IC1 and the output of the second comparator IC2 are zero voltage signals and have no output, so that the optical coupler does not work, the input of the MCU is zero voltage signals, and the copper bar connection of the battery pack to be detected can be judged to be normal.
And if the copper bar connection of the battery pack to be detected is loosened, the detection circuit has different processes under different working conditions.
When I < 0, URBecause of IR, the current I is negative, and the larger the current I is, the equivalent voltage U of the copper barRThe larger, the voltage
Due to UB＞UAThus U isD＞UF＞UGAt this time, the voltage at the inverting input terminal of the first comparator IC1 is greater than the voltage at the forward input terminal, and the first comparator IC1 outputs a zero-voltage signal. Due to the fact that
When R is4Approaching infinite hours, UD≈UEWhen R is4When approaching infinity, UD≈UBTherefore, by setting R4Different resistance values to set the comparison range of the second comparator IC2, i.e., the alarm threshold. If R is set4Is infinitesimally small, UE≈UD＞UFAnd the second comparator IC2 outputs a high level, the optical coupler works, the MCU receives the high level, and the copper bar connection of the battery pack to be detected can be judged to be loose.
When I > 0, URIR, when electricThe current I is a positive value, and the larger the current I is, the equivalent partial pressure U of the copper barRThe larger, the voltage
Due to UB＜UAThen U isE＜UD＜UFAt this time, the inverting input terminal of the second comparator IC2 is larger than the positive input terminal, and is not conductive. Due to the fact that
When R is7Approaching infinite hours, UF≈UGWhen R is7When approaching infinity, UF≈UATherefore, by setting R7Different resistance values to set the comparison range of the first comparator IC1, i.e., the alarm threshold. If R is set7Is infinitesimally small, UF≈UG＞UDAt the moment, the first comparator IC1 outputs a high level signal, the optical coupler works, the MCU receives the high level signal, and the copper bar connection of the battery pack to be detected can be judged to be loose.
It can be seen from the above embodiments that the detection circuit for the connection state of the copper bar provided by the invention can correctly detect the battery pack to be detected under various working conditions, and different voltage comparison ranges can be set according to different resistance values in the voltage comparison circuit. The working process of the detection circuit has no requirement on the magnitude of the current, the accuracy of a detection result cannot be influenced even if the current or the voltage changes in the detection process, and meanwhile, the comparison range of the voltage can be determined by setting the resistance value of the resistor in the detection circuit, so that voltage judgment errors under different working conditions can be avoided.
Fig. 3 is a schematic structural diagram of a power supply system according to the present invention. As shown in fig. 3, the power supply system 30 includes a detection circuit 302 for detecting the connection state of the battery pack 301 and the copper bar, wherein the detection circuit 302 for detecting the connection state of the battery pack 301 and the copper bar is connected.
The detection circuit 302 for the connection state of the copper bar is used for detecting the connection state of the copper bar in the battery pack to be detected; the detection circuit 302 for the copper bar connection state is any one of the detection circuits in the above embodiments.
The present invention may also provide a vehicle including the power supply system of the embodiment shown in fig. 3.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A detection circuit for detecting the connection state of a copper bar is characterized by comprising: the voltage divider circuit, the voltage comparison circuit and the processing circuit;
the voltage dividing circuit is connected with a battery pack to be detected in parallel, the voltage dividing circuit is also connected with a first input end of the voltage comparison circuit, a second input end of the voltage comparison circuit is connected with the battery pack to be detected, and an output end of the voltage comparison circuit is connected with the processing circuit;
the voltage comparison circuit is used for outputting a voltage signal to the processing circuit according to the voltage input to the first input end by the voltage division circuit and the voltage input to the second input end by the battery pack to be detected; the voltage signal is a high level signal or a zero voltage signal;
the processing circuit is used for determining the connection state of the copper bar according to the voltage signal, and if the voltage signal is a high voltage signal, the connection state of the copper bar is that the copper bar is loose; if the voltage signal is a zero voltage signal, the connection state of the copper bar is that the copper bar is normally connected;
the voltage division circuit comprises a first resistor and a second resistor;
the first resistor and the second resistor are connected in series, the first resistor is connected with the anode of the battery pack to be detected, and the second resistor is connected with the cathode of the battery pack to be detected; the ratio of the resistance value of the first resistor to the resistance value of the second resistor is
Wherein z represents the number of the battery cell strings of the battery pack to be detected;
the voltage comparison circuit includes: the resistor comprises a first comparator, a second comparator, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor, wherein the resistance value of the third resistor is equal to the resistance value of the sixth resistor, the resistance value of the fourth resistor is equal to the resistance value of the seventh resistor, the resistance values of the fourth resistor and the seventh resistor are both infinitesimal, and the resistance value of the fifth resistor is equal to the resistance value of the eighth resistor;
the reverse input end of the first comparator is connected with the connection point of the first resistor and the second resistor through the third resistor, the reverse input end of the first comparator is connected with the forward input end of the second comparator through the fourth resistor, the reverse input end of the second comparator is connected with the x-th serial electric core at the negative electrode side of the battery pack to be detected through the sixth resistor, the reverse input end of the second comparator is connected with the forward input end of the first comparator through the seventh resistor, the forward input end of the first comparator is grounded through the eighth resistor, the forward input end of the second comparator is grounded through the fifth resistor, and the output end of the first comparator is connected with the output end of the second comparator and then connected with the input end of the processing circuit;
the first comparator is configured to output a high-level signal to the processing circuit when the voltage of the connection point of the first resistor and the second resistor is less than the voltage of the xth string of battery cells on the negative side of the battery pack to be detected, or output a zero-voltage signal to the processing circuit when the voltage of the connection point of the first resistor and the second resistor is greater than or equal to the voltage of the xth string of battery cells on the negative side of the battery pack to be detected;
the second comparator is configured to output a high-level signal to the processing circuit when the voltage of the connection point of the first resistor and the second resistor is greater than the voltage of the xth string of battery cells on the negative side of the battery pack to be detected, or output a zero-voltage signal to the processing circuit when the voltage of the connection point of the first resistor and the second resistor is less than or equal to the voltage of the xth string of battery cells on the negative side of the battery pack to be detected.
2. The detection circuit of claim 1, further comprising an anti-reverse circuit;
the reverse connection preventing circuit is respectively connected with the voltage comparison circuit and the processing circuit;
the reverse connection preventing circuit is used for preventing current from reversing when the voltage dividing circuit outputs a voltage signal to the processing circuit.
3. The detection circuit of claim 2, wherein the anti-reverse connection circuit comprises a first diode and a second diode;
wherein, the first diode is respectively connected with the first comparator and the processing circuit, and the second diode is respectively connected with the second comparator and the processing circuit.
4. The detection circuit according to any one of claims 1-3, wherein the detection circuit further comprises an optocoupler;
the positive pole of the transmitting end of the optical coupler is connected with the output end of the voltage comparison circuit, the negative pole of the transmitting end of the optical coupler is connected with the negative pole of the battery pack to be detected, the collector of the receiving end of the optical coupler is connected with the input end of the processing circuit, and the emitter of the receiving end of the optical coupler is grounded.
5. A power supply system is characterized by comprising a detection circuit for detecting the connection state of a battery pack and a copper bar, wherein the battery pack to be detected is connected with the detection circuit for detecting the connection state of the copper bar;
the detection circuit of the copper bar connection state is used for detecting the connection state of the copper bar in the battery pack to be detected; the detection circuit for the connection state of the copper bar is the detection circuit of any one of claims 1 to 4.
6. A vehicle characterized by comprising the power supply system of claim 5.
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| CN110716149B (en) * | 2019-10-12 | 2022-06-14 | 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 |
| CN113960500B (en) * | 2021-08-24 | 2024-03-22 | 欣旺达电子股份有限公司 | Detection circuit, detection system and detection method |
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