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CN106936181B - Detection circuit and detection method for contact impedance of charge and discharge loop and self-detection method thereof - Google Patents

Detection circuit and detection method for contact impedance of charge and discharge loop and self-detection method thereof Download PDF

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Publication number
CN106936181B
CN106936181B CN201710115733.3A CN201710115733A CN106936181B CN 106936181 B CN106936181 B CN 106936181B CN 201710115733 A CN201710115733 A CN 201710115733A CN 106936181 B CN106936181 B CN 106936181B
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battery
unit
clamp
voltage sampling
sampling unit
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CN106936181A (en
Inventor
毛广甫
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Shenzhen Repower Industrial Co Ltd
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Shenzhen Repower Industrial Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to the technical field of charge-discharge loop detection, and provides a detection circuit, a detection method and a self-detection method for contact impedance of a charge-discharge loop. The detection circuit comprises a battery, a charging and discharging unit, a current testing unit and a signal processing unit, wherein one end of the charging and discharging unit is connected with the positive electrode of the battery through a first clamp, the other end of the charging and discharging unit is connected with the negative electrode of the battery through a second clamp, the current testing unit is used for measuring the current I flowing into or out of the battery from the charging and discharging unit, the signal processing unit comprises a voltage sampling unit, a reference voltage sampling unit and a control unit, the voltage sampling unit is used for collecting the voltage V between the positive electrode and the negative electrode of the battery, the reference voltage sampling unit is used for collecting the voltage Vs between the first clamp and the second clamp, and the control unit is used for receiving and processing V, Vs and I and calculating the. According to the invention, the value of the contact resistance R of the charge-discharge loop can be obtained, so that whether the clamp is in good contact with the battery electrode can be judged, and the energy consumption waste is avoided.

Description

Detection circuit and detection method for contact impedance of charge and discharge loop and self-detection method thereof
Technical Field
The invention relates to the technical field of charge-discharge loop detection, in particular to a detection circuit, a detection method and a self-detection method for contact impedance of a charge-discharge loop.
Background
In the detection of the charge and discharge loop of the electric element, how many wires are used for testing is closely related to the accuracy of the final detection data. Commonly used detection methods are two-wire and four-wire. The four-wire system is more accurate than the two-wire system in voltage sampling, and can ensure that the battery is charged and discharged to a set voltage value, but has two problems: firstly, whether the current test fixture is in good contact with an electric element is the key for reducing charging and discharging energy consumption and measuring accurately, and the connection condition of the current test fixture cannot be detected by a common two-wire system or four-wire system method; secondly, if the voltage line is disconnected or the contact is seriously poor, if a protection circuit is not added, the voltage value sampled by the voltage is close to zero or is slightly smaller than the true value, overcharging can be caused in a charging state, and overdischarging can be caused in a discharging state; if the protection circuit is added, the voltage of the current line is measured by the circuit, so that the charging state can cause incomplete charging, and the discharging state can cause incomplete discharging.
Disclosure of Invention
The invention aims to provide a detection circuit, a detection method and a self-checking method for contact impedance of a charge and discharge loop, and aims to solve the problem that whether a clamp is in good contact or not is difficult to judge in the charge and discharge loop in the prior art.
The invention provides a detection circuit of contact impedance of a charge and discharge loop, wherein the charge and discharge loop comprises a battery and a charge and discharge unit for charging the battery, one end of the charge and discharge unit is connected with the positive pole of the battery through a first clamp, and the other end of the charge and discharge unit is connected with the negative pole of the battery through a second clamp, and the detection circuit comprises:
the current testing unit is arranged in the charging and discharging loop and used for measuring the current I flowing into or out of the battery from the charging and discharging unit;
the signal processing unit comprises a voltage sampling unit, a reference voltage sampling unit and a control unit, wherein two ends of the voltage sampling unit are respectively connected with the anode and the cathode of the battery and used for collecting voltage V between the anode and the cathode of the battery; one end of the reference voltage sampling unit is connected with the first clamp, and the other end of the reference voltage sampling unit is connected with the second clamp, and is used for collecting voltage Vs between the first clamp and the second clamp; the control unit is connected with the current testing unit, the voltage sampling unit and the reference voltage sampling unit, and is used for receiving and processing V, Vs and I and calculating the value of the contact resistance R.
Specifically, two ends of the voltage sampling unit are respectively connected with the positive electrode and the negative electrode of the battery through voltage probes.
Specifically, two ends of the reference voltage sampling unit are respectively connected with the first clamp and the second clamp through reference electrodes.
Specifically, the signal processing unit further comprises a temperature detection unit for detecting the temperature of the battery, the input end of the temperature detection unit is connected with any part of the battery, and the output end of the temperature detection unit outputs the detected battery temperature signal to the control unit.
Specifically, the temperature detection unit includes a temperature probe, and the input of the temperature detection unit is attached to the outer surface of the battery through the temperature probe.
According to the detection circuit for the contact impedance of the charge and discharge circuit, the magnitude of the value of the contact impedance R of the charge and discharge circuit can be obtained by adding the reference voltage sampling unit on the clamp, so that whether the clamp is in good contact with a battery electrode can be judged, and the waste of energy consumption is avoided.
In order to achieve the above object, the present invention further provides a method for detecting contact impedance of a charge and discharge circuit, the charge and discharge circuit including a battery and a charge and discharge unit for charging the battery, one end of the charge and discharge unit being connected to a positive electrode of the battery through a first clamp, and the other end of the charge and discharge unit being connected to a negative electrode of the battery through a second clamp, the method including the steps of:
s1: measuring a current I flowing into or out of the battery from the charging and discharging unit, measuring a voltage V between the positive electrode and the negative electrode of the battery, and measuring a voltage Vs between the first clamp and the second clamp;
s2: the value of the contact resistance R is calculated, R | (V-Vs)/I |.
Specifically, the method further comprises the step of S3: and comparing the value of the contact resistance R with a preset threshold value, and judging whether the connection between the electrode of the battery and the first clamp and the second clamp is normal or not according to the comparison result.
Specifically, the determining whether the connection between the electrode of the battery and the first and second clamps is normal according to the comparison result specifically includes:
if the value of the contact resistance R is larger than a preset threshold value, judging that the connection between the electrode of the battery and the first clamp and the second clamp is abnormal; and if the value of the contact resistance R is not greater than a preset threshold value, judging that the connection between the electrode of the battery and the first clamp and the second clamp is normal.
According to the detection method of the contact impedance of the charge-discharge loop, the value of the contact impedance R of the charge-discharge loop can be obtained, so that whether the clamp is in good contact with the battery electrode can be judged, and the waste of energy consumption is avoided.
In order to achieve the above object, the present invention further provides a self-testing method of a detection circuit for contact impedance of a charge and discharge circuit, for detecting whether a sampling line of a voltage sampling unit and/or a reference voltage sampling unit in the detection circuit is in poor contact with a battery electrode, the method comprising the steps of:
s11: measuring voltage V between the positive electrode and the negative electrode of the battery, and measuring voltage Vs between the first clamp and the second clamp;
s12: and comparing the voltage V between the anode and the cathode of the battery with the voltage Vs between the first clamp and the second clamp, and judging whether the connection between the sampling line of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is normal or not according to the comparison result.
Specifically, the determining, according to the comparison result, whether the connection between the sampling line of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is normal includes:
judging the state of the battery;
when the battery is in a standing state, judging whether V is equal to Vs, if V is equal to Vs, judging that the connection between the sampling lines of the voltage sampling unit and the reference voltage sampling unit and the battery electrode is normal, and if V is not equal to Vs, judging that the connection between the sampling lines of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is abnormal;
when the battery is in a charging state, judging whether the difference value between Vs and V is within a first preset range, if so, judging that the connection between the sampling lines of the voltage sampling unit and the reference voltage sampling unit and the battery electrode is normal, and if not, judging that the connection between the sampling lines of the voltage sampling unit or the reference voltage sampling unit and the battery electrode is abnormal;
when the battery is in a discharging state, whether the difference value of the V and the Vs is in a second preset range or not is judged, if the difference value of the V and the Vs is in the second preset range, the voltage sampling unit and the sampling line of the reference voltage sampling unit are normally connected with the battery electrode, and if the difference value of the V and the Vs is not in the second preset range, the voltage sampling unit or the sampling line of the reference voltage sampling unit and the battery electrode are abnormally connected.
According to the self-checking method of the detection circuit of the contact impedance of the charge and discharge loop, whether the connection between the sampling line of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is disconnected or seriously poor in contact or not in the detection circuit of the contact impedance of the charge and discharge loop provided by the invention can be detected, and the problems of over-discharge or over-charge, and under-charge or under-discharge of the battery can be effectively prevented.
Drawings
FIG. 1 is a block diagram of a first embodiment of a circuit for detecting contact impedance of a charging/discharging circuit according to the present invention;
FIG. 2 is a block diagram of a second embodiment of a circuit for detecting contact impedance of a charging/discharging circuit according to the present invention;
FIG. 3 is a schematic structural diagram of the embodiment shown in FIG. 2;
FIG. 4 is a schematic flow chart of a method for detecting contact impedance of a charging/discharging circuit according to the present invention;
FIG. 5 is a schematic flow chart illustrating the process of determining whether the connection between the electrode of the battery and the fixture is normal according to the present invention;
FIG. 6 is a schematic flow chart illustrating a self-checking method of the detection circuit for contact impedance of the charge and discharge circuit according to the present invention;
fig. 7 is a schematic flow chart illustrating the process of determining whether the connection between the sampling line of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is normal according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the detection circuit for the contact impedance of the charge and discharge circuit provided by the embodiment of the invention, the reference voltage sampling unit 52 is additionally arranged on the first clamp 30 and the second clamp 40, so that the value of the contact impedance R of the charge and discharge circuit can be obtained, and further whether the first clamp 30 and the second clamp 40 are in good contact with the electrode of the battery 20 can be judged, and the waste of energy consumption is avoided.
The invention can be applied to the charging and discharging circuit of the battery 20 and can also be applied to the charging and discharging circuit of the battery 20 of the quick charger.
Fig. 1 shows a block diagram of a first embodiment of a detection circuit for contact resistance of a charge and discharge circuit according to an embodiment of the present invention, and only the relevant parts of the present invention are shown for convenience of description.
As an embodiment of the present invention, the detection circuit of the contact impedance of the charge and discharge circuit includes a signal processing unit 50 and a current testing unit 60.
The charge and discharge circuit includes a battery 20 and a charge and discharge unit 10 for charging the battery 20, and one end of the charge and discharge unit 10 is connected to a positive electrode of the battery 20 through a first jig 30 and the other end is connected to a negative electrode of the battery 20 through a second jig 40.
The current test unit 60 is provided in the charge and discharge circuit for measuring the current I flowing into or out of the battery 20 from the charge and discharge unit 10.
The signal processing unit 50 includes a voltage sampling unit 51, a reference voltage sampling unit 52 and a control unit 53, wherein two ends of the voltage sampling unit 51 are respectively connected with the positive and negative electrodes of the battery 20, the voltage sampling unit 51 is used for collecting the voltage V between the positive and negative electrodes of the battery 20, one end of the reference voltage sampling unit 52 is connected with the first clamp 30, the other end is connected with the second clamp 40, the voltage sampling unit 51 is used for collecting the voltage Vs between the first clamp 30 and the second clamp 40, the control unit 53 is connected with the current testing unit 60, the voltage sampling unit 51 and the reference voltage sampling unit 52, and the control unit 53 is used for receiving and processing V, Vs and I and calculating the value of the contact impedance R.
In the embodiment of the present invention, the current test unit 60 can collect the current I flowing into or out of the battery 20 from the charge and discharge unit 10, the voltage sampling unit 51 can collect the voltage V between the positive and negative electrodes of the battery 20, the reference voltage sampling unit 52 can collect the voltage Vs between the first jig 30 and the second jig 40, and the control unit 53 receives and processes V, Vs and I and calculates the value of the contact resistance R by | (V-Vs)/I |.
In the embodiment of the present invention, the reference voltage sampling unit 52 is added to the first clamp 30 and the second clamp 40, so that the magnitude of the contact resistance R of the charge-discharge circuit can be obtained, and it can be further determined whether the clamps (the first clamp 30 and the second clamp 40) are in good contact with the electrodes of the battery 20, thereby avoiding waste of energy consumption.
In particular, the first and second clamps 30 and 40 are one or more of a slider-type clamp and a probe-type clamp. In this embodiment, the first jig 30 and the second jig 40 are electrode probes.
Fig. 2 shows a block diagram of a second embodiment of a detection circuit for contact resistance of a charge and discharge circuit according to an embodiment of the present invention. Unlike the first embodiment, in the second embodiment, the signal processing unit 50 further includes a temperature detection unit 54 for detecting the temperature of the battery 20.
In the present embodiment, the input terminal of the temperature detection unit 54 is connected to an arbitrary portion of the battery 20, and the output terminal of the temperature detection unit 54 outputs the detected battery temperature signal to the control unit 53.
In the embodiment of the present invention, the temperature detecting unit 54 can collect the temperature of the surface of the battery 20, so that the battery 20 can detect the temperature of the battery 20 while performing the charge and discharge test.
In the embodiment of the present invention, the reference voltage sampling unit 52 is added to the clamps (the first clamp 30 and the second clamp 40), so that the magnitude of the contact resistance R of the charge-discharge circuit can be obtained, and it can be further determined whether the first clamp 30 and the second clamp 40 are in good contact with the electrode of the battery 20, thereby avoiding waste of energy consumption.
Fig. 3 is a schematic structural diagram of a second embodiment of a detection circuit for contact resistance of a charge and discharge circuit according to an embodiment of the present invention.
Preferably, both ends of the voltage sampling unit 51 are connected to the positive and negative electrodes of the battery 20 through voltage probes 51A, respectively.
Preferably, both ends of the reference voltage sampling unit 52 are connected to the first and second clamps 30 and 40 through the reference electrode 52A, respectively.
In the present embodiment, the voltage sampling unit 51 except the voltage probe 51A is disposed inside the signal processing unit 50, and the reference voltage sampling unit 52 except the reference electrode 52A is disposed inside the signal processing unit 50.
Preferably, the temperature detection unit 54 includes a temperature probe 54A, and an input end of the temperature detection unit 54 is attached to an outer surface of the battery 20 through the temperature probe 54A.
In particular, the temperature probe 54A may be disposed on a tab of the battery 20, or on a surface of the battery 20. The temperature probe 54A may be replaced with another temperature sensor.
In particular, the battery 20 is a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium ion battery.
In the embodiment of the present invention, the current test unit 60 can collect the current I flowing into or out of the battery 20 from the charge and discharge unit 10, the voltage sampling unit 51 can collect the voltage V between the positive and negative electrodes of the battery 20, the reference voltage sampling unit 52 can collect the voltage Vs between the first jig 30 and the second jig 40, and the control unit 53 receives and processes V, Vs and I and calculates the value of the contact resistance R by | (V-Vs)/I |.
In the embodiment of the present invention, the voltage V between the positive electrode and the negative electrode of the battery 20 is collected by the voltage probe 51A, the voltage Vs between the first clamp 30 and the second clamp 40 is collected by the reference electrode 52A, the control unit 53 receives and processes V, Vs and I, calculates the value of the contact resistance R by | (V-Vs)/I | and collects the temperature of the surface of the battery 20 by the temperature probe 54A, so that the battery 20 can detect the temperature of the battery 20 while performing the charging and discharging tests.
In the embodiment of the present invention, the reference voltage sampling unit 52 is added to the clamps (the first clamp 30 and the second clamp 40), so that the magnitude of the contact resistance R of the charge-discharge circuit can be obtained, and it can be further determined whether the first clamp 30 and the second clamp 40 are in good contact with the electrode of the battery 20, thereby avoiding waste of energy consumption.
Fig. 4 is a schematic flow chart illustrating a method for detecting contact impedance of a charge-discharge circuit according to an embodiment of the present invention.
As an embodiment of the present invention, the charge and discharge circuit includes a battery 20 and a charge and discharge unit 10 for charging the battery 20, and one end of the charge and discharge unit 10 is connected to a positive electrode of the battery 20 through a first clamp 30 and the other end is connected to a negative electrode of the battery 20 through a second clamp 40. The detection method of the contact impedance of the charge and discharge loop comprises the following steps:
step S1: measuring a current I flowing into or out of the battery 20 from the charge and discharge unit 10, measuring a voltage V between the positive electrode and the negative electrode of the battery 20, measuring a voltage Vs between the first jig 30 and the second jig 40;
step S2: the value of the contact resistance R is calculated, R | (V-Vs)/I |.
In the embodiment of the present invention, the current I flowing into or out of the battery 20 from the charge and discharge unit 10, the voltage V between the positive electrode and the negative electrode of the battery 20, and the voltage Vs between the first jig 30 and the second jig 40 are first measured, and then the value of the contact resistance R is obtained by the formula of R | (V-Vs)/I |.
According to the method for detecting the contact impedance of the charge and discharge circuit, the magnitude of the value of the contact impedance R of the charge and discharge circuit can be obtained, and whether the clamps (the first clamp 30 and the second clamp 40) are in good contact with the electrodes of the battery 20 can be further judged, so that the waste of energy consumption is avoided.
Fig. 5 is a schematic flow chart illustrating the method for determining whether the connection between the electrode of the battery and the clamp is normal according to the present invention.
As an embodiment of the present invention, the charge and discharge circuit includes a battery 20 and a charge and discharge unit 10 for charging the battery 20, and one end of the charge and discharge unit 10 is connected to a positive electrode of the battery 20 through a first clamp 30 and the other end is connected to a negative electrode of the battery 20 through a second clamp 40. The detection method of the contact impedance of the charge and discharge loop comprises the following steps:
step S1: measuring a current I flowing into or out of the battery 20 from the charge and discharge unit 10, measuring a voltage V between the positive electrode and the negative electrode of the battery 20, measuring a voltage Vs between the first jig 30 and the second jig 40;
step S2: the value of the contact resistance R is calculated, R | (V-Vs)/I |.
Step S3: the value of the contact resistance R is compared with a preset threshold value, and it is judged whether the connection between the electrode of the battery 20 and the first and second clamps 30 and 40 is normal according to the comparison result.
Preferably, the judging whether the connection between the electrode of the battery 20 and the first and second clamps 30 and 40 is normal according to the comparison result includes:
if the value of the contact resistance R is greater than the preset threshold, then S4 is executed: judging that the connection between the electrodes of the battery 20 and the first and second clamps 30 and 40 is not normal; if the value of the contact resistance R is not greater than the preset threshold, S5 is executed: it is judged that the connection between the electrodes of the battery 20 and the first and second clamps 30 and 40 is normal.
In the embodiment of the invention, the value of the contact resistance R is obtained by acquiring data and calculating, and whether the connection between the electrode of the battery 20 and the clamp (the first clamp 30 and the second clamp 40) is normal or not is judged according to the comparison result of the value of the contact resistance R and the preset threshold value, so that the problem of obvious looseness between the electrode of the battery 20 and the clamp can be detected, the problem of poor contact between the electrode of the battery 20 and the clamp can be detected, and the application range is wider; compared with detection depending on manual experience and observation, the method has the advantages that the detection effect is better, and the detection accuracy is guaranteed.
Fig. 6 is a schematic flow chart illustrating a self-checking method of a detection circuit for contact impedance of a charge and discharge circuit according to an embodiment of the present invention.
As an embodiment of the present invention, the self-testing method of the detection circuit of the charge and discharge circuit contact impedance is used for detecting whether the sampling lines of the voltage sampling unit 51 and/or the reference voltage sampling unit 52 (the lines of the voltage sampling unit 51 and the reference voltage sampling unit 52 connected to the electrodes of the battery 20, in the second embodiment shown in fig. 3, the sampling line of the voltage sampling unit 51 refers to the line of the voltage probe 51A connected to the signal processing unit 50, and the sampling line of the reference voltage sampling unit 52 refers to the line of the reference electrode 52A connected to the signal processing unit 50) in the detection circuit are in poor contact with the battery electrodes, and the method includes the following steps:
step S11: measuring the voltage V between the positive and negative poles of the battery 20, measuring the voltage Vs between the first clamp 30 and the second clamp 40;
step S12: and comparing the voltage V between the positive pole and the negative pole of the battery 20 with the voltage Vs between the first clamp 30 and the second clamp 40, and judging whether the connection between the sampling lines of the voltage sampling unit 51 and/or the reference voltage sampling unit 52 and the electrodes of the battery 20 is normal or not according to the comparison result.
In the embodiment of the present invention, by comparing the voltage V between the positive electrode and the negative electrode of the battery 20 with the voltage Vs between the clamps (the first clamp 30 and the second clamp 40), whether the connection between the sampling line of the voltage sampling unit 51 and/or the reference voltage sampling unit 52 and the electrode of the battery 20 is normal can be determined according to the comparison result, and the specific principle is as follows, with reference to fig. 7, a schematic flow chart of determining whether the connection between the sampling line of the voltage sampling unit 51 and/or the reference voltage sampling unit 52 and the electrode of the battery 20 is normal:
step S13: determining whether the battery 20 is in a stationary state (when the battery 20 is neither charged nor discharged); if the battery 20 is in the stationary state, step S14 is executed: judging whether V is equal to Vs: if V is equal to Vs, go to step S18: judging that the connection between the sampling lines of the voltage sampling unit 51 and the reference voltage sampling unit 52 and the electrodes of the battery 20 is normal; if V is not equal to Vs, go to step S19: judging that the connection between the sampling lines of the voltage sampling unit 51 and/or the reference voltage sampling unit 52 and the electrodes of the battery 20 is abnormal;
if the battery 20 is not in the stationary state, step S15 is executed: determining whether the battery 20 is in a charging state, and if the battery 20 is in the charging state, executing step S16 to determine whether the difference between Vs and V is within a first preset range: if the difference between Vs and V is within the first preset range, executing step S18, determining that the connection between the sampling lines of the voltage sampling unit 51 and the reference voltage sampling unit 52 and the electrodes of the battery 20 is normal; if the difference between Vs and V is not within the first preset range, step S19 is executed to determine that the connection between the sampling line of the voltage sampling unit 51 or the reference voltage sampling unit 52 and the electrode of the battery 20 is abnormal;
if the battery 20 is not in the charging state, and the battery 20 is in the discharging state at this time, step S17 is executed: judging whether the difference value of the V and the Vs is within a second preset range or not; if the difference between V and Vs is within the second preset range, executing step S18, determining that the connection between the sampling lines of the voltage sampling unit 51 and the reference voltage sampling unit 52 and the electrodes of the battery 20 is normal; if the difference between V and Vs is not within the second preset range, step S19 is executed to determine that the connection between the sampling line of the voltage sampling unit 51 or the reference voltage sampling unit 52 and the electrode of the battery 20 is abnormal.
In the present embodiment, when the battery is in a charging state, when the sampling lines of the voltage sampling unit 51 and the reference voltage sampling unit 52 are judged to be normally connected to the electrode of the battery 20, and the difference between Vs and V should be in a first preset range different according to different charging stages of the battery, the first preset range is evaluated to be △ V1 ═ R ═ I, R is a reasonable maximum value of the contact resistance, and I is the current at that time, when the battery is in a discharging state, when the sampling lines of the voltage sampling unit 51 and the reference voltage sampling unit 52 are judged to be normally connected to the electrode of the battery 20, and the difference between V and Vs is judged to be normal according to different discharging stages of the battery, the preset range is evaluated to be △ V2 ═ R, R is a reasonable maximum value of the contact resistance, and I is the current at that time.
In particular, the order of determining whether the battery 20 is in the standing state, the charging state, and the discharging state may be changed arbitrarily.
According to the self-checking method of the detection circuit of the contact impedance of the charge and discharge loop, whether the sampling line of the voltage sampling unit 51 or the reference voltage sampling unit 52 is disconnected or seriously poor in contact can be detected, and the problems of over-discharge or over-charge, and under-charge or under-discharge of the battery 20 can be effectively prevented.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. Detection circuitry of charge-discharge circuit contact impedance, charge-discharge circuit includes the battery and is used for the charge-discharge unit that the battery charges, charge-discharge unit's one end through first anchor clamps with the positive pole of battery is connected, the other end pass through the second anchor clamps with the negative pole of battery is connected, its characterized in that, detection circuitry includes:
the current testing unit is arranged in the charging and discharging loop and used for measuring the current I flowing into or out of the battery from the charging and discharging unit;
the signal processing unit comprises a voltage sampling unit, a reference voltage sampling unit and a control unit, wherein two ends of the voltage sampling unit are respectively connected with the anode and the cathode of the battery and used for collecting voltage V between the anode and the cathode of the battery; one end of the reference voltage sampling unit is connected with the first clamp, and the other end of the reference voltage sampling unit is connected with the second clamp, and is used for collecting voltage Vs between the first clamp and the second clamp; the control unit is connected with the current testing unit, the voltage sampling unit and the reference voltage sampling unit, and is used for receiving and processing V, Vs and I, and calculating a value of contact resistance R, wherein R is | (V-Vs)/I |, so as to judge whether the first clamp and the second clamp are in good contact with the positive electrode of the battery and the negative electrode of the battery respectively.
2. The detection circuit according to claim 1, wherein two ends of the voltage sampling unit are respectively connected with the positive electrode and the negative electrode of the battery through voltage probes.
3. The detection circuit according to claim 1, wherein both ends of the reference voltage sampling unit are connected to the first and second clamps through reference electrodes, respectively.
4. The detection circuit according to claim 1, wherein the signal processing unit further includes a temperature detection unit for detecting a temperature of the battery, an input terminal of the temperature detection unit is connected to an arbitrary portion of the battery, and an output terminal of the temperature detection unit outputs the detected battery temperature signal to the control unit.
5. The detection circuit according to claim 4, wherein the temperature detection unit comprises a temperature probe, and an input end of the temperature detection unit is attached to an outer surface of the battery through the temperature probe.
6. The method for detecting the contact impedance of the charge and discharge loop comprises a battery and a charge and discharge unit for charging the battery, wherein a first end of the charge and discharge unit is connected with a positive electrode of the battery through a first clamp, and the other end of the charge and discharge unit is connected with a negative electrode of the battery through a second clamp, and is characterized by comprising the following steps:
s1: measuring a current I flowing into or out of the battery from the charging and discharging unit, measuring a voltage V between the positive electrode and the negative electrode of the battery, and measuring a voltage Vs between the first clamp and the second clamp;
s2: calculating a value of contact resistance R | (V-Vs)/I |, thereby determining whether the first jig and the second jig are in good contact with the positive electrode of the battery and the negative electrode of the battery, respectively.
7. The detection method according to claim 6, further comprising S3: and comparing the value of the contact resistance R with a preset threshold value, and judging whether the connection between the electrode of the battery and the first clamp and the second clamp is normal or not according to the comparison result.
8. The method according to claim 7, wherein the determining whether the connection between the electrode of the battery and the first and second clamps is normal according to the comparison result comprises:
if the value of the contact resistance R is larger than a preset threshold value, judging that the connection between the electrode of the battery and the first clamp and the second clamp is abnormal; and if the value of the contact resistance R is not greater than a preset threshold value, judging that the connection between the electrode of the battery and the first clamp and the second clamp is normal.
9. The self-checking method of the detection circuit of the contact impedance of the charge and discharge circuit is used for detecting whether the sampling line of the voltage sampling unit and/or the reference voltage sampling unit in the detection circuit of any claim 1 to 5 is in poor contact with the battery electrode, and is characterized by comprising the following steps:
s11: measuring voltage V between the positive electrode and the negative electrode of the battery, and measuring voltage Vs between the first clamp and the second clamp;
s12: comparing the voltage V between the positive electrode and the negative electrode of the battery with the voltage Vs between the first clamp and the second clamp, and judging whether the connection between the sampling line of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is normal or not according to the comparison result;
the judging whether the connection between the sampling line of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is normal according to the comparison result specifically comprises:
judging the state of the battery;
when the battery is in a standing state, judging whether V is equal to Vs, if V is equal to Vs, judging that the connection between the sampling lines of the voltage sampling unit and the reference voltage sampling unit and the battery electrode is normal, and if V is not equal to Vs, judging that the connection between the sampling lines of the voltage sampling unit and/or the reference voltage sampling unit and the battery electrode is abnormal;
when the battery is in a charging state, judging whether the difference value between Vs and V is within a first preset range, if so, judging that the connection between the sampling lines of the voltage sampling unit and the reference voltage sampling unit and the battery electrode is normal, and if not, judging that the connection between the sampling lines of the voltage sampling unit or the reference voltage sampling unit and the battery electrode is abnormal;
when the battery is in a discharging state, whether the difference value of the V and the Vs is in a second preset range or not is judged, if the difference value of the V and the Vs is in the second preset range, the voltage sampling unit and the sampling line of the reference voltage sampling unit are normally connected with the battery electrode, and if the difference value of the V and the Vs is not in the second preset range, the voltage sampling unit or the sampling line of the reference voltage sampling unit and the battery electrode are abnormally connected.
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