KR20210073049A - Apparatus for measuring insulation resistance - Google Patents

Abstract

In the present invention, when the resistance value of the insulation resistance is large, the insulation resistance measurement unit controls the first insulation measurement switch in an on state to measure the insulation resistance of the battery through the first insulation measurement resistance portion, and the resistance value of the insulation resistance is advanced. In a smaller case than the case, the insulation resistance measuring unit controls the second insulation measuring switch in an on state to measure the insulation resistance of the battery through the second insulation measuring resistance unit. As described above, according to the present invention, since the insulation resistance is measured for each section (that is, a section having a large resistance value of the insulation resistance and a section smaller than this) according to the resistance value of the insulation resistance, the safety of the vehicle and vehicle occupants is improved. At the same time, it is possible to measure the insulation resistance of the battery with relatively high accuracy.

Description

Insulation resistance measuring device {APPARATUS FOR MEASURING INSULATION RESISTANCE}

The present invention relates to a device capable of measuring the insulation resistance of a battery with high precision.

In an electric vehicle or a hybrid vehicle using a high voltage battery, the insulation resistance of the battery is very important because it informs that a ground fault has occurred. The positive insulation resistance between the positive terminal of the battery and the ground (for example, the chassis ground of a vehicle) and the negative insulation resistance between the negative terminal of the battery and the ground have an infinite value in the absence of a ground fault. In case of an accident, it has a finite resistance value.

Insulation resistance of such a battery is generally measured using the voltage applied to the distribution resistors (R4, R5) after forming a current path leading to the positive terminal of the battery, the ground, and the negative terminal of the battery, as in Patent Document 1 below. do.

Such a conventional insulation resistance measuring apparatus secures safety in insulation resistance measurement by using a resistor having a relatively large resistance value. That is, when the resistance value of the resistor used in the insulation resistance measuring device is small, the amount of current flowing in the current path leading to the positive terminal of the battery, the ground, and the negative terminal of the battery increases, so that leakage electricity flows in the vehicle, It may cause electric shock to occupants. Therefore, by increasing the resistance value of the resistor used in the insulation resistance measuring device, it is necessary to reduce the amount of current flowing in the current path to improve the safety of the vehicle and vehicle occupants.

However, if the resistance value of the resistor used in the insulation resistance measuring device is large, the error range of the resistance value is inevitably large. For example, assuming that the resistance value of a resistor used in an insulation resistance measuring device has a tolerance of ±0.1%, a resistance of 1MΩ has an error range of ±1kΩ, whereas a resistance of 100kΩ is ±0.1%. It has only an error range of 100Ω. As such, when the resistance value of the resistor used in the insulation resistance measurement device is large and has a relatively large error range, the accuracy of the insulation resistance measurement value of the battery is inevitably reduced. Accordingly, there is a need to provide a device capable of measuring the insulation resistance of a battery with high accuracy while ensuring the safety of the vehicle and vehicle occupants.

Japanese Unexamined Patent Publication No. 2003-66090 (2003.03.05)

The present invention has been devised to solve the above problems, and it is an object of the present invention to provide a device capable of measuring the insulation resistance of a battery with high accuracy while promoting the safety of a vehicle and vehicle occupants.

In order to achieve the above object, an insulation resistance measuring apparatus according to a first embodiment of the present invention includes: a first insulation measuring resistance unit connected in series with an electrode terminal and a ground of a battery; a first insulation measurement switch connected in series with the first insulation measurement resistance unit; a second insulation measurement resistance unit connected in parallel with the first insulation measurement resistance unit; a second insulation measurement switch connected in series with the second insulation measurement resistance unit; and an insulation resistance measuring unit configured to measure the insulation resistance of the battery by controlling on-off operations of the first insulation measurement switch and the second insulation measurement switch.

Here, the resistance value of the second insulation measurement resistance part may be smaller than the resistance value of the first insulation measurement resistance part.

And the insulation resistance measuring unit controls the first insulation measurement switch to an on state, and controls the second insulation measurement switch to an off state to measure the insulation resistance of the battery, but the resistance value of the insulation resistance of the battery is When the value is less than or equal to the set value, the insulation resistance of the battery may be measured by controlling the first insulation measurement switch to an off state and controlling the second insulation measurement switch to an on state.

And the first insulation measuring resistance unit may include a first insulation protection resistor connected in series with the electrode terminal of the battery and a first insulation distribution resistance connected in series with the first insulation protection resistance, the second insulation The measurement resistance unit may include a second insulation protection resistor connected in series with the electrode terminal of the battery and a second insulation distribution resistance connected in series with the second insulation protection resistance, and the insulation resistance measurement unit may include the first insulation resistance. The insulation resistance of the battery may be measured using a voltage applied to the distribution resistor or a voltage applied to the second insulation distribution resistor.

And the insulation resistance measuring apparatus according to the first embodiment of the present invention may further include a DC voltage source connected to the negative terminal of the battery and the ground.

In addition, the insulation resistance measuring apparatus according to the second embodiment of the present invention, the first negative insulation measuring resistance unit connected in series with the positive terminal and the ground of the battery; a first negative insulation measurement switch connected in series with the first negative insulation measurement resistance unit; a second negative electrode insulation measurement resistance unit connected in parallel with the first negative electrode insulation measurement resistance unit; a second negative insulation measurement switch connected in series with the second negative insulation measurement resistance unit; a first positive insulation measuring resistor connected in series with the negative terminal of the battery and the ground; a first positive electrode insulation measurement switch connected in series with the first positive electrode insulation measurement resistance unit; a second anode insulation measuring resistance unit connected in parallel with the first anode insulation measuring resistance unit; a second positive electrode insulation measurement switch connected in series with the second positive electrode insulation measurement resistance unit; and measuring the negative insulation resistance of the battery by controlling on-off operations of the first negative insulation measurement switch and the second negative insulation measurement switch, and turning on the first positive insulation insulation measurement switch and the second positive insulation measurement switch and an insulation resistance measuring unit measuring the positive insulation resistance of the battery by controlling the off operation.

Here, the resistance value of the second negative insulation measurement resistance part may be smaller than the resistance value of the first negative electrode insulation measurement resistance part.

A resistance value of the second anode insulation measurement resistance unit may be smaller than a resistance value of the first anode insulation measurement resistance unit.

And the insulation resistance measuring unit controls the first negative insulation measuring switch in an on state, and controlling the second negative insulation measuring switch in an off state to measure the negative insulation resistance of the battery, but of the negative insulation resistance of the battery When the resistance value is equal to or less than a preset value, the negative electrode insulation resistance of the battery may be measured by controlling the first negative electrode insulation measuring switch to an off state and controlling the second negative electrode insulation measuring switch to an on state.

And the insulation resistance measuring unit controls the first positive electrode insulation measurement switch to an on state, and controls the second positive electrode insulation measurement switch to an off state to measure the positive electrode insulation resistance of the battery, but the positive electrode insulation resistance of the battery When the resistance value is equal to or less than a preset value, the positive electrode insulation resistance of the battery may be measured by controlling the first positive electrode insulation measuring switch to be in an off state and controlling the second positive electrode insulation measuring switch to an on state.

And the first negative insulation measuring resistance unit may include a first negative insulation protection resistor connected in series with the positive terminal of the battery and a first negative insulation distribution resistor connected in series with the first negative insulation protection resistance, The second negative insulation measuring resistance unit may include a second negative insulation protection resistor connected in series with the positive terminal of the battery and a second negative insulation distribution resistor connected in series with the second negative insulation protection resistance, the The insulation resistance measuring unit may measure the negative insulation resistance of the battery using a voltage applied to the first negative insulation distribution resistor or a voltage applied to the second negative insulation distribution resistance.

And the first positive insulation measuring resistance unit may include a first positive insulation protection resistor connected in series with the negative terminal of the battery and a first positive insulation distribution resistor connected in series with the first positive insulation protection resistance, The second positive insulation measuring resistance unit may include a second positive insulation protection resistor connected in series with the negative terminal of the battery and a second positive insulation distribution resistor connected in series with the second positive insulation protection resistance, the The insulation resistance measuring unit may measure the positive insulation resistance of the battery by using a voltage applied to the first positive insulation distribution resistor or a voltage applied to the second positive insulation distribution resistance.

And the insulation resistance measuring apparatus according to the second embodiment of the present invention may further include a DC voltage source connected to the negative terminal of the battery and the ground.

In the present invention, when the resistance value of the insulation resistance is large, the insulation resistance measurement unit controls the first insulation measurement switch in an on state to measure the insulation resistance of the battery through the first insulation measurement resistance portion, and the resistance value of the insulation resistance is advanced. In the case of smaller than the case, the insulation resistance measuring unit is configured to control the second insulation measuring switch in an on state to measure the insulation resistance of the battery through the second insulation measuring resistance unit. According to the present invention, since the insulation resistance is measured for each section (that is, a section with a large resistance value of the insulation resistance and a section smaller than this) according to the resistance value of the insulation resistance, the safety of the vehicle and vehicle occupants can be improved. At the same time, it is possible to measure the insulation resistance of the battery with relatively high accuracy.

1 is a view showing an insulation resistance measuring apparatus according to an embodiment of the present invention.
2 is a view showing a state in which the insulation resistance measuring unit controls the first negative insulation measurement switch to an on state and the second negative electrode insulation measurement switch to an off state in order to measure the negative insulation resistance of the battery.
3 is a view showing a state in which the insulation resistance measuring unit controls the first negative insulation measuring switch to the off state and the second negative electrode insulation measuring switch to the on state in order to measure the negative insulation resistance of the battery.
4 is a view showing a state in which the insulation resistance measuring unit controls the first positive insulation measuring switch to the on state and the second positive electrode insulation measuring switch to the off state in order to measure the positive insulation resistance of the battery.
5 is a view showing a state in which the insulation resistance measuring unit controls the first positive insulation measuring switch to an off state and controlling the second positive insulation measuring switch to an on state in order to measure the positive insulation resistance of the battery.

Hereinafter, an insulation resistance measuring apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are provided by way of example only so that the technical idea of the present invention can be sufficiently conveyed to those skilled in the art, and the present invention is not limited to the drawings presented below and may be embodied in other forms. have.

1 is a view showing an insulation resistance measuring apparatus according to an embodiment of the present invention. Insulation resistance measuring apparatus according to an embodiment of the present invention includes a first insulation measuring resistance unit (110, 120), a first insulation measuring switch (210, 220), a second insulation measuring resistance unit (310, 320), the second It may include insulation measuring switches 410 and 420 and an insulation resistance measuring unit 500 .

Although it is shown in FIG. 1 that the insulation resistance measuring device is provided between the positive terminal 12 and the ground of the battery 10 and between the negative terminal 14 and the ground of the battery 10, the insulation resistance measurement The device may be provided only between the positive terminal 12 of the battery 10 and the ground and between the negative terminal 14 of the battery 10 and the ground.

The first insulation measuring resistance units 110 and 120 are connected in series with the electrode terminals 12 and 14 of the battery 10 and the ground. Specifically, the first negative insulation measuring resistance unit 110 is connected in series with the positive terminal 12 and the ground of the battery 10 , and the first positive insulation measuring resistance unit 120 is the negative terminal of the battery 10 . (14) and connected in series with ground. Here, the battery 10 may be one in which a plurality of battery cells are connected in series, connected in parallel, or connected in series-parallel mixture.

The first negative insulation measuring resistance unit 110 includes first negative insulation protection resistors 112: 112-1 and 112-2 connected in series with the positive terminal 12 of the battery 10, and the first negative insulation A first negative insulating distribution resistor 114 connected in series with the protection resistors 112: 112-1 and 112-2 may be included. And the first positive insulation measuring resistance unit 120 is a first positive insulation protection resistor (122: 122-1, 122-2) connected in series with the negative terminal 14 of the battery 10, and the first positive electrode It may include a first positive insulation distribution resistor 124 connected in series with the insulation protection resistors 122: 122-1 and 122-2.

Here, the first negative insulation protection resistor 112 and the first positive insulation protection resistance 122 reduce the current flowing between the battery 10 and the ground, and serve to promote the safety of the vehicle and vehicle occupants. And the first negative insulation distribution resistor 114 is such that the insulation resistance measuring unit 500, which will be described later, measures the negative insulation resistance of the battery 10 by measuring the voltage applied to the first negative insulation distribution resistance 114 . And, the first positive insulation distribution resistor 124 allows the insulation resistance measuring unit 500 to measure the positive insulation resistance of the battery 10 by measuring the voltage applied to the first positive insulation distribution resistance 124 . plays a role

The first insulation measurement switches 210 and 220 are connected in series with the first insulation measurement resistance units 110 and 120 . Specifically, the first negative insulation measurement switch 210 is connected in series with the first negative insulation measurement resistance unit 110 , and the first positive insulation measurement switch 220 is the first positive insulation measurement resistance unit 120 and connected in series

The first negative insulation protection resistor 112 of the first negative insulation measurement resistance unit 110 may be disposed at both ends of the first negative insulation measurement switch 210 , respectively. That is, from the positive terminal 12 of the battery 10 toward the ground, the first negative insulation protection resistor 112-1, the first negative insulation measurement switch 210 and the first negative insulation protection resistance 112-2 may be arranged in order. In addition, the first negative insulation distribution resistor 114 may be disposed between the first negative insulation protection resistor 112 - 2 and the ground.

The first positive insulation protection resistance 122 of the first positive insulation measurement resistance unit 120 may be disposed at both ends of the first positive insulation insulation measurement switch 220 , respectively. That is, from the negative terminal 14 of the battery 10 toward the ground, the first positive insulation protection resistor 122-1, the first positive insulation measuring switch 220 and the first positive insulation protection resistance 122-2 may be arranged in order. In addition, the first anode insulation distribution resistor 124 may be disposed between the first anode insulation protection resistor 122-2 and the ground.

Meanwhile, the second insulation measuring resistance units 310 and 320 are connected in series with the electrode terminals 12 and 14 and the ground of the battery 10 , and are connected in parallel with the first insulation measuring resistance units 110 and 120 . . Specifically, the second negative insulation measurement resistance unit 310 is connected in series with the positive terminal 12 and the ground of the battery 10 , and is connected in parallel with the first negative insulation measurement resistance unit 110 . In addition, the second positive insulation measuring resistance unit 320 is connected in series with the negative terminal 14 and the ground of the battery 10 , and is connected in parallel with the first positive insulating measuring resistance unit 120 .

The second negative insulation measuring resistance unit 310 includes second negative insulation protection resistors 312: 312-1 and 312-2 connected in series with the positive terminal 12 of the battery 10, and the second negative insulation A second negative insulating distribution resistor 314 connected in series with the protection resistors 312: 312-1 and 312-2 may be included. And the second positive insulation measuring resistance unit 320 is a second positive insulation protection resistor (322: 322-1, 322-2) connected in series with the negative terminal 14 of the battery 10, and the second positive electrode A second anode insulation distribution resistor 324 connected in series with the insulation protection resistors 322: 322-1 and 322-2 may be included.

Here, the second negative insulation protection resistor 312 and the second positive insulation protection resistance 322 reduce the current flowing between the battery 10 and the ground, and serve to promote the safety of the vehicle and vehicle occupants. And the second negative insulation distribution resistor 314 enables the insulation resistance measuring unit 500 to measure the negative insulation resistance of the battery 10 by measuring the voltage applied to the second negative insulation distribution resistor 314, The second positive insulation distribution resistor 324 serves to enable the insulation resistance measuring unit 500 to measure the positive insulation resistance of the battery 10 by measuring the voltage applied to the second positive insulation distribution resistance 324 . do.

The first negative insulation measuring resistance unit 110 uses the first negative insulation protection resistor 112 and the first negative insulation distribution resistor 114 having a relatively large resistance value, so that the negative insulation resistance (Riso-) of the battery 10 is used. ) is measured, it is desirable to ensure the safety of the vehicle and vehicle occupants. However, as described above, if the resistance value is large, the error range of the resistance is large by that amount, so the accuracy of the insulation resistance measurement value of the battery 10 is inevitably reduced.

Accordingly, by making the resistance value of the second negative insulation measurement resistance unit 310 smaller than the resistance value of the first negative insulation measurement resistance unit 110 , it is desirable to increase the accuracy of the negative insulation resistance measurement value of the battery 10 . Do. For example, the resistance value of the second negative insulation protection resistor 312 may be smaller than the resistance value of the first negative insulation protection resistance 112 , and the resistance value of the second negative insulation distribution resistor 314 is the second negative insulation protection resistance value. 1 It may be smaller than the resistance value of the negative insulation distribution resistor 114 . Alternatively, the sum of the resistance value of the second negative insulation protection resistor 312 and the resistance value of the second negative insulation distribution resistor 314 is the resistance value of the first negative insulation protection resistor 112 and the first negative insulation distribution resistance ( 114) may be smaller than the sum of the resistance values.

When the insulation resistance measurement unit 500 measures the negative insulation resistance of the battery 10 through the first negative insulation measurement resistance unit 110 or while measuring the negative insulation resistance of the battery 10, the battery ( When the resistance value of the negative insulation resistance of 10) is less than or equal to a value (eg, 100 kΩ) preset in the insulation resistance measurement unit 500 , the insulation resistance measurement unit 500 performs the first negative insulation measurement resistance unit 110 . The negative insulation resistance of the battery 10 is measured through the second negative insulation measuring resistance unit 310 having a resistance value smaller than the resistance value of .

In this case, since the resistance value of the second negative insulation measurement resistance unit 310 is smaller than the resistance value of the first negative insulation measurement resistance unit 110 , the insulation resistance measurement unit 500 performs the negative insulation of the battery 10 . Resistance can be measured with relatively high accuracy. And at this time, the resistance value of the second negative insulation measurement resistance unit 310 is appropriately selected within a small range compared to the resistance value of the first negative insulation measurement resistance unit 110, and a relatively small amount between the battery 10 and the ground By allowing the current to flow, the safety of the vehicle and vehicle occupants can also be promoted.

Similarly, the first positive insulation measuring resistance unit 120 uses the first positive insulation protection resistor 122 and the first positive insulation distribution resistor 124 having a relatively large resistance value, so that the positive insulation resistance of the battery 10 is used. When (Riso+) is measured, it is desirable to ensure the safety of the vehicle and its occupants. However, as described above, if the resistance value is large, the error range of the resistance is large by that amount, so the accuracy of the insulation resistance measurement value of the battery 10 is inevitably reduced.

Accordingly, by making the resistance value of the second positive electrode insulation measurement resistance unit 320 smaller than the resistance value of the first positive electrode insulation measurement resistance unit 120 , it is desirable to increase the accuracy of the positive electrode insulation resistance measurement value of the battery 10 . Do. For example, the resistance value of the second anode insulation protection resistor 322 may be smaller than the resistance value of the first anode insulation protection resistor 122 , and the resistance value of the second anode insulation distribution resistor 324 is the first 1 It may be smaller than the resistance value of the anode insulation distribution resistor 124 . Alternatively, the sum of the resistance value of the second anode insulation protection resistor 322 and the resistance value of the second anode insulation distribution resistor 324 is the resistance value of the first anode insulation protection resistor 122 and the first anode insulation distribution resistor ( 124) may be smaller than the sum of the resistance values.

When the insulation resistance measuring unit 500 measures the positive insulation resistance of the battery 10 through the first positive insulation measurement resistance unit 120 or while measuring the positive insulation resistance of the battery 10, the battery ( When the resistance value of the anode insulation resistance of 10) is less than or equal to a value (eg, 100 kΩ) preset in the insulation resistance measuring unit 500 , the insulation resistance measuring unit 500 is configured to the first anode insulation measuring resistance unit 120 . The positive insulation resistance of the battery 10 is measured through the second positive insulation measuring resistance unit 320 having a resistance value smaller than the resistance value of .

In this case, since the resistance value of the second positive electrode insulation measurement resistance unit 320 is smaller than the resistance value of the first positive electrode insulation measurement resistance unit 120 , the insulation resistance measurement unit 500 performs the positive insulation of the battery 10 . Resistance can be measured with relatively high accuracy. And at this time, the resistance value of the second positive electrode insulation measurement resistance unit 320 is appropriately selected within a small range compared to the resistance value of the first positive electrode insulation measurement resistance unit 120, and a relatively small amount between the battery 10 and the ground By allowing the current to flow, the safety of the vehicle and vehicle occupants can also be promoted.

The second insulation measurement switches 410 and 420 are connected in series with the second insulation measurement resistance units 310 and 320 . Specifically, the second negative insulation measurement switch 410 is connected in series with the second negative insulation measurement resistance unit 310 , and the second positive insulation measurement switch 420 includes the second positive insulation measurement resistance unit 320 and connected in series

The insulation resistance measurement unit 500 measures the insulation resistance of the battery 10 by controlling the on-off operations of the first insulation measurement switches 210 and 220 and the second insulation measurement switches 410 and 420 .

In order for the insulation resistance measuring unit 500 to measure the insulation resistance of the battery 10, a current path leading to the positive terminal 12 of the battery 10, the ground, and the negative terminal 14 of the battery 10 must be formed. To this end, the insulation resistance measurement unit 500 controls the on-off operation of the first insulation measurement switches 210 and 220 and the second insulation measurement switches 410 and 420 .

Here, the insulation resistance measurement unit 500 measures the negative insulation resistance (Riso-) of the battery 10 by controlling the on-off operation of the first negative insulation measurement switch 210 and the second negative insulation measurement switch 410 . and control the on-off operation of the first positive electrode insulation measurement switch 220 and the second positive electrode insulation measurement switch 420 to measure the positive insulation resistance (Riso+) of the battery 10 . And the insulation resistance measuring unit 500 is the voltage applied to the first insulation distribution resistors 114 and 124 of the first insulation measuring resistance units 110 and 120 or the second of the second insulation measuring resistance units 310 and 320 . A voltage applied to the insulation distribution resistors 314 and 324 is measured, and the insulation resistance of the battery 10 is measured using the measured voltage.

In this way, the insulation resistance measuring unit 500 is the voltage applied to the first insulation distribution resistors 114 and 124 of the first insulation measuring resistance units 110 and 120 or the second insulation measuring resistance units 310 and 320 . Measuring the voltage applied to the second insulation distribution resistors 314 and 324, measuring the insulation resistance of the battery 10 using the measured voltage, the first insulation measuring switches 210 and 220 and the second insulation In order to control the operation of the measuring switches 410 and 420 , the insulation resistance measuring unit 500 may be formed of or include a micro controller unit (MCU).

Hereinafter, an embodiment in which the insulation resistance measuring unit 500 measures the insulation resistance of the battery 10 will be described in detail with further reference to FIGS. 2 to 5 .

As shown in FIG. 2 , the insulation resistance measurement unit 500 controls the first negative insulation measurement switch 210 to be on to measure the negative insulation resistance of the battery 10 , and measures the second negative insulation resistance. The switch 410 is controlled to be in an off state. At this time, the insulation resistance measurement unit 500 controls the first positive electrode insulation measurement switch 220 and the second positive electrode insulation measurement switch 420 to also be off. In this case, the positive terminal 12 of the battery 10, the first negative insulation protection resistor 112-1, the first negative insulation measuring switch 210, the first negative insulation protection resistance 112-2, the first A current path leading to the negative insulation distribution resistor 114 , the ground, the negative insulation resistance Riso- of the battery 10 , and the negative terminal 14 of the battery 10 is formed.

An RC circuit resistor 710 may be connected to a node between the first negative insulation protection resistor 112 - 2 and the first negative insulation distribution resistor 114 , and the RC circuit resistance 710 and the insulation resistance measuring unit 500 . The RC circuit capacitor 810 may be connected to a node between them. Accordingly, the insulation resistance measuring unit 500 can measure the voltage applied to both ends of the first cathode insulation distribution resistor 114, and calculate the current flowing through the current path by using the measured voltage, , it is possible to measure the negative insulation resistance (more specifically, the resistance value of the negative insulation resistance) of the battery 10 using the calculated current.

When the insulation resistance measurement unit 500 measures the resistance value of the negative insulation resistance of the battery 10 in this way, the measured resistance value of the negative insulation resistance of the battery 10 is transmitted to the insulation resistance measurement unit 500 . When it is less than the preset value, as shown in FIG. 3 , the insulation resistance measuring unit 500 controls the first negative insulation measurement switch 210 to be in an off state, and turns on the second negative insulation measurement switch 410 . By controlling the state, it is possible to measure the negative insulation resistance (more specifically, the resistance value of the negative insulation resistance) of the battery 10 . In this case, the positive terminal 12 of the battery 10, the second negative insulation protection resistor 312-1, the second negative insulation measurement switch 410, the second negative insulation protection resistance 312-2, the first 2 A current path leading to the negative insulation distribution resistor 314 , the ground, the negative insulation resistance Riso- of the battery 10 , and the negative terminal 14 of the battery 10 is formed.

The RC circuit resistor 710 may also be connected to a node between the second negative insulation protection resistor 312 - 2 and the second negative insulation distribution resistor 314 . Accordingly, the insulation resistance measuring unit 500 can measure the voltage applied to both ends of the second cathode insulation distribution resistor 314, and calculate the current flowing through the current path using the measured voltage. , it is possible to measure the negative insulation resistance (more specifically, the resistance value of the negative insulation resistance) of the battery 10 using the calculated current. In this case, since the resistance value of the second negative insulation measurement resistance unit 310 is smaller than the resistance value of the first negative insulation measurement resistance unit 110 , the insulation resistance measurement unit 500 performs the negative insulation of the battery 10 . Resistance can be measured with relatively high accuracy.

On the other hand, as shown in FIG. 4 , the insulation resistance measurement unit 500 controls the first positive insulation measurement switch 220 to be on to measure the positive insulation resistance of the battery 10 , and the second positive electrode The insulation measuring switch 420 is controlled in an off state. At this time, the insulation resistance measuring unit 500 controls the first negative insulation measurement switch 210 and the second negative insulation measurement switch 410 to also be turned off. In this case, the positive terminal 12 of the battery 10, the positive insulation resistance (Riso+) of the battery 10, the ground, the first positive insulation distribution resistor 124, the first positive insulation protection resistor 122-2, A current path leading to the first positive insulation measuring switch 220 , the first positive insulation protection resistor 122-1 and the negative terminal 14 of the battery 10 is formed.

An RC circuit resistor 720 may be connected to a node between the first anode insulation protection resistor 122 - 2 and the first anode insulation distribution resistor 124 , and the RC circuit resistor 720 and the insulation resistance measuring unit 500 . The RC circuit capacitor 820 may be connected to a node between them. Accordingly, the insulation resistance measuring unit 500 can measure the voltage applied to both ends of the first anode insulation distribution resistor 124, and calculate the current flowing through the current path by using the measured voltage, , it is possible to measure the positive electrode insulation resistance (more specifically, the resistance value of the positive electrode insulation resistance) of the battery 10 using the calculated current.

Here, when the insulation resistance measuring unit 500 measures the voltage applied to both ends of the first positive insulation distribution resistor 124 , in order for the measured voltage to come out with a non-negative value, the It is preferable that the negative terminal 14 and the DC voltage source 600 connected to the ground are provided. More specifically, the DC voltage source 600 is preferably disposed between the first anode insulating distribution resistor 124 and the ground in terms of adjusting the range of the voltage.

When the insulation resistance measurement unit 500 measures the resistance value of the positive insulation resistance of the battery 10 in this way, the measured resistance value of the positive insulation resistance of the battery 10 is transmitted to the insulation resistance measurement unit 500 . When the value is less than or equal to the preset value, as shown in FIG. 5 , the insulation resistance measuring unit 500 controls the first positive electrode insulation measurement switch 220 to an off state, and turns on the second positive electrode insulation measurement switch 420 . By controlling the state, it is possible to measure the positive electrode insulation resistance (more specifically, the resistance value of the positive electrode insulation resistance) of the battery 10 . In this case, the positive terminal 12 of the battery 10, the positive insulation resistance (Riso+) of the battery 10, the ground, the second positive insulation distribution resistor 324, the second positive insulation protection resistance 322-2 , a current path leading to the second positive insulation measurement switch 420 , the second positive insulation protection resistor 322-1 and the negative terminal 14 of the battery 10 is formed.

The RC circuit resistor 720 may also be connected to a node between the second anode insulation protection resistor 322 - 2 and the second anode insulation distribution resistor 324 . Accordingly, the insulation resistance measuring unit 500 can measure the voltage applied to both ends of the second anode insulation distribution resistor 324, and calculate the current flowing through the current path by using the measured voltage, , it is possible to measure the positive electrode insulation resistance (more specifically, the resistance value of the positive electrode insulation resistance) of the battery 10 using the calculated current. In this case, since the resistance value of the second positive electrode insulation measurement resistance unit 320 is smaller than the resistance value of the first positive electrode insulation measurement resistance unit 120 , the insulation resistance measurement unit 500 performs the positive insulation of the battery 10 . Resistance can be measured with relatively high accuracy.

Although it is shown in FIGS. 1 to 5 that only one second negative insulation measurement resistance unit 310 is connected in parallel to the first negative electrode insulation measurement resistance unit 110 , the resistance value of the second negative electrode insulation measurement resistance unit 310 is shown. An insulation measuring resistance unit having a smaller resistance value may be connected in parallel to the second negative insulation measuring resistance unit 310 , and an insulation measuring switch may be connected in series to such an insulation measuring resistance unit.

And, although it is shown in FIGS. 1 to 5 that only one second anode insulation measurement resistance unit 320 is connected in parallel to the first positive electrode insulation measurement resistance unit 120 , the second positive electrode insulation measurement resistance unit 320 is An insulation measuring resistance unit having a resistance value smaller than the resistance value may be connected in parallel to the second anode insulation measuring resistance unit 320 , and an insulation measuring switch may be connected in series to the insulation measuring resistance unit.

That is, insulation measuring resistance units having a small resistance value may be sequentially connected in parallel to the first insulation measuring resistance units 110 and 120 shown in FIG. 1 and the like, and an insulation measuring switch is provided in the insulating measuring resistance unit sequentially connected in parallel. Each may be connected in series.

In this case, the insulation resistance measurement unit 500 measures the insulation resistance of the battery 10 through the first insulation measurement resistance units 110 and 120 by first controlling the first insulation measurement switches 210 and 220 in an on state, , when the resistance value of the insulation resistance of the battery 10 is less than or equal to a preset value (a first preset value), the first insulation measurement switches 210 and 220 are controlled to the off state, and the second insulation measurement switch 410, The insulation resistance of the battery 10 is measured through the second insulation measurement resistance units 310 and 320 by controlling the 420 to be turned on.

Subsequently, the insulation resistance measuring unit 500 turns off the second insulation measuring switches 410 and 420 when the resistance value of the insulation resistance of the battery 10 is less than or equal to a preset value (a second preset value). Insulation measuring resistance unit sequentially connected in parallel to the second insulation measuring resistance unit 310 and 320 by controlling the insulation measuring switch sequentially connected in parallel to the second insulation measuring resistance unit 310 and 320 to the on state. Through this, the insulation resistance of the battery 10 is measured. By sequentially configuring the insulation measuring resistance units as described above, the insulation resistance of the battery 10 can be measured with higher accuracy.

As described above, although the present invention has been described with reference to the limited examples and drawings, the present invention is not limited to the above examples, which are various modifications and variations from these descriptions by those of ordinary skill in the art to which the present invention pertains. Of course, variations are possible. Accordingly, the technical spirit of the present invention should be understood only by the claims, and all equivalents or equivalent modifications thereof will fall within the scope of the technical spirit of the present invention.

10: battery
12: electrode terminal (positive terminal)
14: electrode terminal (negative terminal)
110: first insulation measurement resistance portion (first negative insulation measurement resistance portion)
112 (112-1, 112-2): first insulation protection resistance (first negative insulation protection resistance)
114: first insulation distribution resistor (first negative insulation distribution resistance)
120: first insulation measurement resistance unit (first positive electrode insulation measurement resistance portion)
122 (122-1, 122-2): first insulation protection resistance (first positive insulation protection resistance)
124: first insulation distribution resistor (first anode insulation distribution resistance)
210: first insulation measurement switch (first negative insulation measurement switch)
220: first insulation measurement switch (first positive insulation measurement switch)
310: second insulation measurement resistance unit (second negative insulation measurement resistance portion)
312 (312-1, 312-2): second insulation protection resistance (second negative insulation protection resistance)
314: second insulation distribution resistor (second cathode insulation distribution resistance)
320: second insulation measurement resistance unit (second anode insulation measurement resistance unit)
322 (322-1, 322-2): second insulation protection resistance (second positive insulation protection resistance)
324: second insulation distribution resistor (second anode insulation distribution resistance)
410: second insulation measurement switch (second negative insulation measurement switch)
420: second insulation measurement switch (second positive insulation measurement switch)
500: insulation resistance measuring unit

Claims (13)

a first insulation measuring resistor connected in series with the electrode terminal and the ground of the battery;
a first insulation measurement switch connected in series with the first insulation measurement resistance unit;
a second insulation measurement resistance unit connected in parallel with the first insulation measurement resistance unit;
a second insulation measurement switch connected in series with the second insulation measurement resistance unit; and
Insulation resistance measuring device comprising a; insulation resistance measuring unit for measuring the insulation resistance of the battery by controlling the on-off operation of the first insulation measurement switch and the second insulation measurement switch.
According to claim 1,
A resistance value of the second insulation measurement resistance unit is smaller than a resistance value of the first insulation resistance measurement unit.
According to claim 1,
The insulation resistance measuring unit measures the insulation resistance of the battery by controlling the first insulation measurement switch in an on state, and controlling the second insulation measurement switch in an off state, wherein the resistance value of the insulation resistance of the battery is preset Insulation resistance measuring device, characterized in that the insulation resistance of the battery is measured by controlling the first insulation measurement switch to an off state and controlling the second insulation measurement switch to an on state when the value is less than the value.
According to claim 1,
The first insulation measuring resistance unit includes a first insulation protection resistor connected in series with the electrode terminal of the battery and a first insulation distribution resistor connected in series with the first insulation protection resistance,
The second insulation measuring resistance unit includes a second insulation protection resistor connected in series with the electrode terminal of the battery and a second insulation distribution resistance connected in series with the second insulation protection resistance,
The insulation resistance measuring unit measures the insulation resistance of the battery by using a voltage applied to the first insulation distribution resistor or a voltage applied to the second insulation distribution resistance.
According to claim 1,
Insulation resistance measuring device further comprising a DC voltage source connected to the negative terminal of the battery and the ground.
a first negative insulation measuring resistor connected in series with the positive terminal and the ground of the battery;
a first negative insulation measurement switch connected in series with the first negative insulation measurement resistance unit;
a second negative electrode insulation measurement resistance unit connected in parallel with the first negative electrode insulation measurement resistance unit;
a second negative insulation measurement switch connected in series with the second negative insulation measurement resistance unit;
a first positive insulation measuring resistor connected in series with the negative terminal of the battery and the ground;
a first positive electrode insulation measurement switch connected in series with the first positive electrode insulation measurement resistance unit;
a second anode insulation measuring resistance unit connected in parallel with the first anode insulation measuring resistance unit;
a second positive electrode insulation measurement switch connected in series with the second positive electrode insulation measurement resistance unit; and
Measuring the negative insulation resistance of the battery by controlling the on-off operation of the first negative electrode insulation measurement switch and the second negative insulation measurement switch, the on-off of the first positive insulation measurement switch and the second positive insulation measurement switch Insulation resistance measuring device including; insulation resistance measuring unit for controlling the operation to measure the insulation resistance of the positive electrode of the battery.
7. The method of claim 6,
A resistance value of the second cathode insulation measurement resistance unit is smaller than a resistance value of the first cathode insulation measurement resistance unit.
7. The method of claim 6,
A resistance value of the second anode insulation measurement resistance unit is smaller than a resistance value of the first anode insulation measurement resistance unit.
7. The method of claim 6,
The insulation resistance measuring unit controls the first negative insulation measurement switch to an on state, and controls the second negative insulation measurement switch to an off state to measure the negative insulation resistance of the battery, but the resistance of the negative insulation resistance of the battery Insulation, characterized in that, when the value is less than or equal to a preset value, the first negative electrode insulation measurement switch is controlled to an off state, and the second negative electrode insulation measurement switch is controlled to an on state to measure the negative electrode insulation resistance of the battery resistance measuring device.
7. The method of claim 6,
The insulation resistance measuring unit controls the first positive electrode insulation measurement switch to an on state, and controls the second positive electrode insulation measurement switch to an off state to measure the positive electrode insulation resistance of the battery, but the resistance of the positive electrode insulation resistance of the battery Insulation, characterized in that, when the value is less than or equal to a preset value, the first positive electrode insulation measurement switch is controlled to an off state, and the second positive electrode insulation measurement switch is controlled to an on state to measure the positive electrode insulation resistance of the battery resistance measuring device.
7. The method of claim 6,
The first negative insulation measuring resistance unit includes a first negative insulation protection resistor connected in series with the positive terminal of the battery and a first negative insulation distribution resistor connected in series with the first negative insulation protection resistance,
The second negative insulation measuring resistance unit includes a second negative insulation protection resistor connected in series with the positive terminal of the battery and a second negative insulation distribution resistor connected in series with the second negative insulation protection resistance,
The insulation resistance measuring unit measures the insulation resistance of the battery by using a voltage applied to the first negative insulation distribution resistor or a voltage applied to the second negative insulation distribution resistance.
7. The method of claim 6,
The first positive insulation measuring resistance unit includes a first positive insulation protection resistor connected in series with the negative terminal of the battery and a first positive insulation distribution resistor connected in series with the first positive insulation protection resistance,
The second positive insulation measuring resistance unit includes a second positive insulation protection resistor connected in series with the negative terminal of the battery and a second positive insulation distribution resistor connected in series with the second positive insulation protection resistance,
The insulation resistance measuring unit measures the insulation resistance of the battery using a voltage applied to the first anode insulation distribution resistor or a voltage applied to the second anode insulation distribution resistor.
7. The method of claim 6,
Insulation resistance measuring device further comprising a DC voltage source connected to the negative terminal of the battery and the ground.

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