CN117805614A - Insulation resistance inspection device and insulation resistance inspection method - Google Patents
Insulation resistance inspection device and insulation resistance inspection method Download PDFInfo
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- CN117805614A CN117805614A CN202311067874.4A CN202311067874A CN117805614A CN 117805614 A CN117805614 A CN 117805614A CN 202311067874 A CN202311067874 A CN 202311067874A CN 117805614 A CN117805614 A CN 117805614A
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- 238000009413 insulation Methods 0.000 title claims abstract description 139
- 238000007689 inspection Methods 0.000 title claims abstract description 83
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- 239000003990 capacitor Substances 0.000 claims description 12
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- 238000005259 measurement Methods 0.000 description 7
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- 238000007796 conventional method Methods 0.000 description 2
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Abstract
The insulation resistance inspection device of the present disclosure includes: the first magnetic current sensor is configured between the control unit and the ground; and a first damping resistor arranged in series with respect to the first magnetic current sensor between the control unit and ground. Further, the insulation resistance inspection apparatus of the present disclosure includes: the second magnetic current sensor is configured between the positive terminal of the battery pack and the ground; and a second damping resistor disposed in series with respect to the second magnetic current sensor between the positive terminal of the battery pack and the ground.
Description
Technical Field
The present disclosure relates to an apparatus and method for checking insulation resistance of a battery pack provided with a control unit having an electrolytic capacitor.
Background
The insulation resistance of the battery pack was checked at the time of transmission of the battery pack. As disclosed in, for example, japanese patent application laid-open No. 2017-075929, the following methods are used in the prior art: the resistor is connected between the battery pack and the package body accommodating the battery pack, and the insulation resistance is checked based on the voltage difference between the resistors.
However, the conventional method for inspecting the insulation resistance has a problem that it takes time to inspect the insulation resistance. This is caused by the fact that a control unit for controlling the output of the battery pack is assembled in the circuit of the battery pack. Since the control unit has an electrolytic capacitor, the insulation resistance value calculated from the voltage difference is continuously changed before charge is accumulated in the electrolytic capacitor. A certain time is required until accumulation of charges in the electrolytic capacitor is stopped and the insulation resistance value is stabilized, which is a cause of a long inspection time.
Disclosure of Invention
The present disclosure has been made in view of the above problems. An object of the present disclosure is to enable rapid inspection of insulation resistance of a battery pack provided with a control unit with an electrolytic capacitor.
The present disclosure provides an insulation resistance inspection apparatus for achieving the above object. In one embodiment of the present disclosure,
the insulation resistance inspection device is provided with:
the first magnetic current sensor is configured between the control unit and the ground; and
a first damping resistor is arranged in series with respect to the first magnetic current sensor between the control unit and ground.
The insulation resistance inspection device further includes:
the second magnetic current sensor is configured between the positive terminal of the battery pack and the ground; and
the second damping resistor is disposed in series with respect to the second magnetic current sensor between the positive terminal of the battery pack and ground.
The resistance value of the insulation resistance of the battery pack can be calculated based on the voltage value of the battery pack, the current value (first current value) of the current flowing between the control unit and the ground, and the current value (second current value) of the current flowing between the positive terminal of the battery pack and the ground. According to the above embodiment, the current value of the current flowing between the control unit and the ground is measured by the first magnetic current sensor, and the current value of the current flowing between the positive electrode terminal of the battery pack and the ground is measured by the second magnetic current sensor. However, the magneto-electric current sensor is easily responsive to a magnetic field generated in an external environment. Therefore, if only the magnetic current sensor is mounted, there is a possibility that the output value of the magnetic current sensor deviates from the zero point regardless of whether the zero point adjustment is performed. Deviation of the output value from the zero point causes an error in the measured value of the insulation resistance.
In this regard, in the above embodiment, the damping resistor is arranged in series with each of the magnetic current sensors. The magneto-resistive current sensor does not require a resistor, and has an advantage in that power loss is small as compared with the resistive current sensor. However, by intentionally disposing the damping resistor, it is possible to suppress the flow of current due to the external magnetic field. Therefore, according to the above embodiment, it is possible to obtain the correct current value corresponding to the resistance value of the actual insulation resistance of the battery pack from each of the magnetic current sensors.
An insulation resistance inspection method according to an embodiment of the present disclosure is a method of inspecting insulation resistance of a battery pack using the insulation resistance inspection apparatus described above. The insulation resistance inspection method includes:
performing zero point adjustment of the first magnetic current sensor; and
zero point adjustment of the second magnetic current sensor is performed.
Since the damping resistors are arranged in series with the respective magnetic current sensors, the zero point adjustment can be performed accurately. In addition, the insulation resistance inspection method includes:
acquiring a first current value measured by a first magnetic current sensor; and
a second current value measured by a second magnetic current sensor is acquired.
Since the current values obtained from the respective magnetic current sensors do not include the influence of the electrolytic capacitor, the current values can be obtained without waiting for a certain time to elapse. The insulation resistance inspection method includes:
the resistance value of the insulation resistance of the battery pack is calculated based on the voltage value, the first current value, and the second current value of the battery pack.
According to the above method, the resistance value of the insulation resistance can be accurately obtained without waiting for a certain time to elapse after the voltage of the battery pack is applied, so that the time required for checking the insulation resistance of the battery pack can be shortened.
In the insulation resistance inspection apparatus according to another embodiment of the present disclosure,
the first magnetic current sensor is configured as a first set of a plurality of magnetic current sensors arranged in series.
In addition, the second magnetic current sensor is configured as a second set of a plurality of magnetic current sensors arranged in series.
Thus, the accuracy of measuring the current value can be ensured by comparing the power values of the magnetic current sensors constituting the set with each other.
Another embodiment of the present disclosure relates to an insulation resistance inspection method that inspects insulation resistance of a battery pack using the insulation resistance inspection apparatus described above. The insulation resistance inspection method includes:
performing zero point adjustment of each of the plurality of magnetic current sensors constituting the first set; and
zero point adjustment of each of the plurality of magnetic current sensors constituting the second set is performed.
The insulation resistance inspection method includes:
when the error between the current values measured by the plurality of magnetic current sensors constituting the first set is within the allowable error range, a first current value representing the current values measured by the plurality of magnetic current sensors constituting the first set is acquired.
In addition, the insulation resistance inspection method includes: when the error between the current values measured by the plurality of magnetic current sensors constituting the second set is within the allowable error range, a second current value representing the current values measured by the plurality of magnetic current sensors constituting the second set is acquired.
In addition, the insulation resistance inspection method includes: the resistance value of the insulation resistance of the battery pack is calculated based on the voltage value, the first current value, and the second current value of the battery pack.
That is, according to this insulation resistance inspection method, the inspection of the insulation resistance using the first current value is performed only when it is confirmed that there is no abnormality in the result of the mutual comparison of the power values between the magnetic current sensors constituting the first set. Further, only when it is confirmed that there is no abnormality in the result of the mutual comparison of the power values between the magnetic current sensors constituting the second set, the inspection of the insulation resistance using the second current value is performed. According to this method, it is possible to improve the inspection accuracy of the insulation resistance while shortening the time required for the inspection of the insulation resistance of the battery pack.
As described above, the present disclosure provides an insulation resistance inspection device and an insulation resistance inspection method that can rapidly inspect the insulation resistance of a battery pack including a control unit with an electrolytic capacitor. According to the present disclosure, the time required for inspection of the insulation resistance of the battery pack can be shortened.
Drawings
Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described with reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which:
fig. 1A is a circuit diagram of a battery pack mounted with an insulation resistance inspection device;
fig. 1B is a graph showing characteristics of an insulation resistance inspection apparatus;
fig. 2 is a circuit diagram of an equivalent circuit of a battery pack mounted with an insulation resistance inspection device at the time of inspection of insulation resistance;
FIG. 3 is a flowchart showing steps of an insulation resistance inspection method;
fig. 4A is a circuit diagram showing an example of the circuit configuration of the current sensor unit;
fig. 4B is a graph showing the effect obtained by this circuit configuration;
fig. 5 (a) is a circuit diagram showing a first embodiment of the current sensor unit;
fig. 5 (B) is a circuit diagram showing a second embodiment of the current sensor unit;
fig. 6 is a flowchart showing steps of an insulation resistance inspection method using the insulation resistance inspection apparatus provided with the current sensor unit according to the second embodiment.
Detailed Description
Fig. 1A is a circuit diagram of a battery pack 1 to which an insulation resistance inspection device 20 according to an embodiment of the present disclosure is attached. The battery pack 1 to be inspected by the insulation resistance inspection device 20 includes a battery pack 10 configured by connecting a plurality of single cells, and a control unit 6 having an electrolytic capacitor 7 inside. The battery pack 1 includes an insulation resistor 4 on the negative terminal side of the battery pack 10, and an insulation resistor 5 on the positive terminal side of the battery pack 10.
The insulation resistance inspection device 20 includes a detection resistor 2 provided between the positive electrode terminal and the ground, and a voltmeter 3 for measuring a voltage applied to the detection resistor 2. The detection resistor 2 is connected in parallel with the insulation resistor 5. The insulation resistance inspection device 20 further includes: a first current sensor unit 11 that measures a current value (first current value) of a current flowing between the control unit 6 and the ground; and a second current sensor unit 12 that measures a current value (second current value) of the current flowing through the detection resistor 2. By using the insulation resistance inspection device 20 thus configured, the insulation resistance of the battery pack 1 is inspected in the following manner.
In the inspection of the insulation resistance using the insulation resistance inspection device 20, the resistance value of the insulation resistance 4 on the negative electrode terminal side is calculated. The resistance value of the insulation resistance 4 can be used as an evaluation index of the insulation resistance of the battery pack 1. The calculation of the resistance value of the insulation resistance 4 is performed by a system that performs an insulation resistance inspection method (hereinafter referred to as an insulation resistance inspection system). However, the resistance value may be calculated by the inspector.
As information used for calculation of the resistance value of the insulation resistance 4, the insulation resistance inspection system acquires the voltage value of the battery pack 10. The voltage value may be a rated voltage value determined in advance, or a value measured by a measuring instrument. The measurement by the measuring instrument may be performed by an inspector or by a voltmeter different from the voltmeter 3 provided in the battery pack 1. The insulation resistance inspection system acquires a voltage value of the voltage applied to the detection resistor 2 by the voltmeter 3. Further, the insulation resistance inspection system acquires a first current value through the first current sensor unit 11 and acquires a second current value through the second current sensor unit 12. The first current value and the second current value are used for calculation of the resistance value of the insulation resistance 4 together with the voltage value acquired by the voltmeter 3.
Fig. 2 is a circuit diagram of an equivalent circuit of the battery pack 1 mounted with the insulation resistance inspection device 20 at the time of inspection of insulation resistance. A method for calculating the resistance value of the insulation resistor 4 will be described below with reference to fig. 2.
The current flowing through the entire circuit of the battery pack 1 is branched into a current flowing through the control unit 6 and a current flowing through the insulation resistor 4 on the negative terminal side. Thereby, the current value I of the current flowing through the insulation resistor 4 m Can be used as a current value I of a current flowing through the whole circuit and a current value I of a current flowing through the control unit 6 ECU I.e. the difference between the first current values.
As the current value I, a current value I of a current flowing through the detection resistor 2 can be used p (second current value), resistance value R of insulation resistor 5 on positive electrode terminal side p And a resistance value R of the detection resistor 2 s To (1+R) s /R p )×I p And (3) representing. In order to improve the safety factor of the battery pack 1 as a whole, the resistance value R is the insulation resistance 5 p A minimum value satisfying the standard value of the insulation resistance is used. Further, the resistance value R as the detection resistor 2 s Using a maximum value within a range of allowable errors relative to a nominal value. Voltage V applied to insulation resistor 4 on the negative terminal side m Voltage V capable of being used as battery pack 10 0 And a voltage V applied to the detection resistor 2 p The difference is indicated.
Using the above relationship, the resistance value R of the insulation resistor 4 on the negative terminal side m Can be represented by the following formula. The insulation resistance inspection system calculates a resistance value R by substituting a measured value or an assumed value into the following equation m . Can be based on the resistance R thus calculated m Whether or not the insulation resistance is within the standard value range, and whether or not the insulation resistance is abnormal is determined.
R m ＝(V 0 ―V p )/{(1+R s /R p )×I p -I ECU }
In the conventional method for inspecting insulation resistance, insulation resistance 4 on the negative terminal side of battery pack 1 is inspected based on the voltage across detection resistor 2 measured by voltmeter 3. However, as shown by a broken line in the graph of fig. 1B, the voltage applied across the detection resistor 2 decreases with time due to the influence of the electrolytic capacitor 7. Further, there is a fluctuation in the time until the voltage transitions to stabilize. That is, the conventional inspection method requires a long time for inspecting the insulation resistance, and the fluctuation of the time required for the inspection is large.
However, according to the inspection of the insulation resistance using the insulation resistance inspection device 20, it is not necessary to follow the time-dependent change of the voltage applied to the detection resistor 2, and the measurement can be ended at the time when the voltage value can be obtained, as enclosed by a circle in the graph of fig. 1B. That is, by using the insulation resistance inspection device 20, the influence of the state of charge of the electrolytic capacitor 7 can be eliminated, and the time for inspecting the insulation resistance can be shortened as compared with the conventional inspection method.
Fig. 3 is a flowchart showing steps of an insulation resistance inspection method using the insulation resistance inspection device 20. In S100 in the flowchart, the voltage value of the voltage applied to the detection resistor 2 is measured by the voltmeter 3. In addition, a rated value of the total voltage of the battery pack 1 is read, or an actual measurement value of the total voltage of the battery pack 1 is measured. In S110, a first current value is measured by the first current sensor unit 11. In addition, a second current value is measured by the second current sensor unit 12. The process of S100 and the process of S110 are performed simultaneously. However, the process of S110 may be performed after the process of S100.
In S120, the resistance value of the insulation resistance 4 on the negative electrode terminal side of the battery pack 1 is calculated using the respective measurement values obtained in S100 and S110. In S130, it is determined whether or not the insulation resistance value calculated in S120 is within the range of the standard value. The standard value can be arbitrarily set.
If it is determined that the insulation resistance value is within the standard value, the process proceeds to S140. In S140, the battery pack 1 having the insulation resistance value within the range of the standard value is determined to be a good product. On the other hand, when it is determined that the insulation resistance value is out of the standard value range, the process proceeds to S150. In S150, the battery pack 1 having an insulation resistance value outside the range of the standard value is determined to be a defective product. According to this inspection method, it is possible to rapidly inspect whether or not the battery pack 1 is a good product in terms of insulation resistance.
Next, a specific circuit configuration of the current sensor units 11 and 12 to which the insulation resistance inspection apparatus 20 is applied will be described. Magnetic current sensors are used for the current sensor units 11 and 12. The mode of the operation principle of the magnetic current sensor is not limited. However, when zero point adjustment is performed on the magnetic current sensor in a circuit having a low impedance circuit, the magnetic current sensor generates electromotive force due to a magnetic field generated by an external environment. Therefore, the zero point is deviated due to the current flowing by the electromotive force. The zero point deviation causes a decrease in the inspection accuracy of the insulation resistance.
Therefore, a configuration in which the magnetic current sensor 30 and the damping resistor 31 are arranged in series as shown in fig. 4A has been studied. By intentionally combining the damping resistor 31 with the magnetic current sensor 30 that does not use a resistor for measuring the current, it is possible to suppress the flow of the current due to the external magnetic field. Fig. 4B is a graph showing the effect obtained by the circuit configuration shown in fig. 4A. As shown in the graph, if the resistance value of the damping resistor 31 is continuously increased, the error of the current value with respect to the zero point becomes smaller. In the experiment, it was confirmed that the error in the current value was absolutely reduced if the resistance value was about 10Ω. In addition, it was confirmed that if the resistance value was increased to about 30Ω, the error in the current value was reduced to the order of 1 μa.
Fig. 5 (a) is a circuit diagram showing a first embodiment of the current sensor units 11 and 12 provided in the insulation resistance inspection apparatus 20. The first current sensor unit 11 is constituted by a first magneto-current sensor 40 and a first damping resistor 41 arranged in series. The second current sensor unit 12 is constituted by a second magnetic current sensor 50 and a second damping resistor 51 arranged in series. The resistance values of the damping resistors 41 and 51 may be set to any values as long as the errors of the output values of the magnetic current sensors 40 and 50 with respect to the zero point can be sufficiently suppressed. By using the insulation resistance inspection device 20 including the current sensor units 11 and 12 configured as described above for inspection, the time required for inspection of the insulation resistance can be shortened and the inspection accuracy of the insulation resistance can be improved.
Fig. 5 (B) is a circuit diagram showing a second embodiment of the current sensor units 11 and 12 provided in the insulation resistance inspection apparatus 20. The first current sensor unit 11 is constituted by a first magneto-current sensor 40 and a first damping resistor 41 arranged in series. However, the first magnetic current sensor 40 according to the second embodiment is a set (first set) of 2 magnetic current sensors 40-1, 40-2 arranged in series, as opposed to the first magnetic current sensor 40 according to the first embodiment being a single magnetic current sensor. The second current sensor unit 12 is constituted by a second magnetic current sensor 50 and a second damping resistor 51 arranged in series. However, the second magnetic current sensor 50 according to the second embodiment is a set (second set) of 2 magnetic current sensors 50-1, 50-2 arranged in series, as opposed to the second magnetic current sensor 50 according to the first embodiment being a single magnetic current sensor.
By using the insulation resistance inspection device 20 having the current sensor units 11, 12 having the circuit configuration shown in fig. 5 (a) or fig. 5 (B), it is possible to improve the inspection accuracy of the insulation resistance while shortening the time required for the inspection of the insulation resistance. In particular, according to the insulation resistance inspection apparatus 20 including the current sensor units 11 and 12 having the circuit configuration shown in fig. 5 (B), the insulation resistance of the battery pack 1 can be inspected in the steps shown in fig. 6.
According to the steps shown in fig. 6, in S200, the zero current values of the respective magnetic current sensors 40-1, 40-2 are acquired in the first current sensor unit 11. In addition, the zero current values of the respective magnetic current sensors 50-1, 50-2 are acquired in the second current sensor unit 12.
Next, in S210, zero point adjustment of each of the magnetic current sensors 40-1, 40-2 is performed in the first current sensor unit 11. In the second current sensor unit 12, zero point adjustment of each of the magnetic current sensors 50-1 and 50-2 is performed. After the zero point adjustment is completed, the process of S220 is performed. In S220, the measurement of the resistance value of the insulation resistance 4 on the negative terminal side of the battery pack 1 is started in accordance with the procedure described with reference to fig. 3.
In S230, the current value I measured by the magnetic current sensor 40-1 in the first current sensor unit 11 is calculated 1 And the current value I measured by the magnetic current sensor 40-2 2 The magnitude of the error between them. Then, it is determined whether the magnitude of the error is within the allowable error range. Similarly, the current value I measured by the magnetic current sensor 50-1 in the second current sensor unit 12 is calculated 1 And the current value I measured by the magnetic current sensor 50-2 2 The magnitude of the error between them. Then, it is determined whether the magnitude of the error is within the allowable error range. The value of the allowable error can be arbitrarily set.
In the case where the error of the current value between the magnetic current sensors in at least one of the first current sensor unit 11 and the second current sensor unit 12 exceeds the allowable error, the process proceeds to S260. In S260, it is determined that a measurement abnormality has occurred in the insulation resistance inspection apparatus 20. In this case, replacement of the current sensor unit that generated the measurement abnormality is performed.
In the case where the error of the current value between the magnetic current sensors in both of the current sensor units 11, 12 falls within the allowable error range, the process proceeds to S240. In S240, it is determined whether the insulation resistance value calculated in S220 is within a range of standard values.
If it is determined that the insulation resistance value is within the standard value, the process proceeds to S250. In S250, the battery pack 1 having the insulation resistance value within the range of the standard value is determined to be a good product. On the other hand, when it is determined that the insulation resistance value is out of the standard value range, the process proceeds to S270. In S270, the battery pack 1 having an insulation resistance value outside the range of the standard value is determined to be a defective product. According to this inspection method, it is possible to rapidly and accurately inspect whether or not the battery pack 1 is a good product in terms of insulation resistance.
Claims (5)
1. An insulation resistance inspection apparatus that inspects insulation resistance of a battery pack provided with a control unit having an electrolytic capacitor, the insulation resistance inspection apparatus comprising:
the first magnetic current sensor is configured between the control unit and the ground;
a first damping resistor configured in series with respect to the first magnetic current sensor between the control unit and the ground;
a second magnetic current sensor disposed between the positive terminal of the battery pack and the ground; and
a second damping resistor is disposed in series with respect to the second magnetic current sensor between the positive terminal and the ground.
2. The insulation resistance inspection apparatus according to claim 1, wherein,
the first magnetic current sensor is a first set of a plurality of magnetic current sensors configured in series,
the second magnetic current sensor is a second set of a plurality of magnetic current sensors configured in series.
3. A method of inspecting insulation resistance of the battery pack using the insulation resistance inspection apparatus of claim 1,
the method comprises the following steps:
performing zero point adjustment of the first magnetic current sensor and performing zero point adjustment of the second magnetic current sensor;
acquiring a first current value measured by the first magnetic current sensor;
acquiring a second current value measured by the second magnetic current sensor; and
and calculating a resistance value of an insulation resistance of the battery pack based on the voltage value of the battery pack, the first current value and the second current value.
4. A method of inspecting insulation resistance of the battery pack using the insulation resistance inspection apparatus according to claim 2,
the method comprises the following steps:
performing zero point adjustment of each of a plurality of magnetic current sensors constituting the first set;
performing zero point adjustment of each of a plurality of magnetic current sensors constituting the second set;
acquiring a first current value representing the current values measured by the plurality of magnetic current sensors constituting the first set, when the error between the current values measured by the plurality of magnetic current sensors constituting the first set is within a range of allowable error;
obtaining a second current value representing the current values measured by the plurality of magnetic current sensors constituting the second set, when the error between the current values measured by the plurality of magnetic current sensors constituting the second set is within a range of allowable error; and
and calculating a resistance value of an insulation resistance of the battery pack based on the voltage value of the battery pack, the first current value and the second current value.
5. An insulation resistance inspection method for inspecting insulation resistance of a battery pack provided with a control unit having an electrolytic capacitor,
the insulation resistance inspection method includes:
acquiring a first current value which is a measured value of a current flowing between the control unit and the ground;
acquiring a second current value which is a measured value of a current flowing between a positive terminal of the battery pack and ground; and
and calculating a resistance value of an insulation resistance of the battery pack based on the voltage value of the battery pack, the first current value and the second current value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-158354 | 2022-09-30 | ||
| JP2023045541A JP2024052485A (en) | 2022-09-30 | 2023-03-22 | Insulation resistance inspection device and insulation resistance inspection method |
| JP2023-045541 | 2023-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117805614A true CN117805614A (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311067874.4A Pending CN117805614A (en) | 2022-09-30 | 2023-08-23 | Insulation resistance inspection device and insulation resistance inspection method |
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| Country | Link |
|---|---|
| CN (1) | CN117805614A (en) |
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2023
- 2023-08-23 CN CN202311067874.4A patent/CN117805614A/en active Pending
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