Apparatus and method for measuring resistance

Abstract

Disclosed in an embodiment is a resistance measuring apparatus, comprising: a first switch connected to a positive electrode of a battery; a second switch connected to a negative electrode of the battery; a third switch connected between the first switch and the second switch; and a voltage measurement unit connected to the third switch.

Description

Resistance measuring device and method

[0001] The embodiment relates to an insulation resistance measuring device and method.

[0002] As research and development on electric vehicles, energy storage batteries, robots, satellites, etc. becomes active, research on high-performance batteries that can be repeatedly charged and discharged is also actively being conducted, and currently commercialized battery packs include rechargeable storage elements such as nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium-ion batteries.

[0003] For battery packs used in large electrical products requiring high voltages, such as electric vehicles, perfect insulation between the battery pack and the vehicle body (i.e., ground) is essential. Failure to maintain insulation within the battery pack can result in leakage current, which can lead to battery discharge and malfunction or failure of battery-equipped electronic devices. In particular, leakage current in high-voltage batteries, such as those used in electric or hybrid vehicles, can result in fatal electric shock to the user. To more accurately assess battery pack insulation deterioration and mitigate these risks, a more accurate and simple method for measuring insulation resistance between the battery pack and the vehicle body is needed.

[0004] The embodiment provides a resistance measuring device and method that can simplify the configuration of a device required for measuring insulation resistance.

[0005] In addition, a resistance measuring device and method capable of reducing the cost required for measuring insulation resistance are provided.

[0006] The problem to be solved in the embodiment is not limited to this, and it can be said that the purpose or effect that can be understood from the solution or embodiment of the problem described below is also included.

[0007] A resistance measuring device according to an embodiment may include a first switch connected to a positive pole of a battery; a second switch connected to a negative pole of the battery; a third switch connected between the first switch and the second switch; and a voltage measuring unit connected to the third switch.

[0008] A resistance measuring device according to an embodiment may include a first resistor connected between the positive electrode of the battery and the first switch and a second resistor connected between the negative electrode of the battery and the second switch.

[0009] The resistance measuring device according to the embodiment may include a third resistor connected between the third switch and the voltage measuring unit.

[0010] The above voltage measuring unit can measure the voltage applied to the third resistor.

[0011] A resistance measuring device according to an embodiment includes a reference voltage unit connected to the third resistor, and the reference voltage unit can be connected to ground.

[0012] The resistance measuring device according to the embodiment may include a controller connected to the voltage measuring unit.

[0013] When the first switch and the third switch are turned on, the voltage measuring unit can measure the positive electrode insulation resistance of the battery.

[0014] When the second switch and the third switch are turned on, the voltage measuring unit can measure the negative insulation resistance of the battery.

[0015] The above controller can measure the positive insulation resistance or the negative insulation resistance according to the voltage measured by the voltage measuring unit.

[0016] The controller may determine that the battery is not insulated if the positive insulation resistance or the negative insulation resistance is less than a preset reference resistance value.

[0017] The controller may determine that the positive or negative pole of the battery is not insulated when the positive or negative pole insulation resistance is less than 1 mΩ.

[0018] The controller can generate a signal for turning on or off the first switch to the third switch and transmit the signal to the first switch to the third switch, respectively.

[0019] A resistance measuring method according to an embodiment includes a step of turning on a neutral switch; a step of turning on a positive switch; a step of measuring positive insulation resistance in a controller; a step of turning off the positive switch; a step of turning on a negative switch; a step of measuring negative insulation resistance in a controller; and a step of turning off the negative switch; wherein the neutral switch can be connected between the positive switch and the negative switch.

[0020] According to an embodiment, a resistance measuring device and method can be provided that can simplify the configuration of a device required for measuring insulation resistance.

[0021] In addition, a resistance measuring device and method capable of reducing the cost required for measuring insulation resistance can be provided.

[0022] The various advantageous and beneficial effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

[0023] Figure 1 is a configuration diagram of a resistance measuring device according to an embodiment;

[0024] Figure 2 is a block diagram for explaining a resistance measuring device according to an embodiment.

[0025] Fig. 3 is a circuit diagram of a resistance measuring device according to an embodiment;

[0026] Figures 4 and 5 are exemplary diagrams showing the process of measuring insulation resistance in a resistance measuring device according to an embodiment.

[0027] Figure 6 is a flowchart of a resistance measurement method according to an embodiment.

[0028] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0029] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0030] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0031] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0032] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0033] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0034] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0035] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0036] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0037] Fig. 1 is a block diagram of a resistance measuring device according to an embodiment, Fig. 2 is a block diagram for explaining a resistance measuring device according to an embodiment, and Fig. 3 is a circuit diagram of a resistance measuring device according to an embodiment.

[0038] Referring to FIGS. 1 to 3, a resistance measuring device (100) according to an embodiment may include a resistance unit (110), a switch unit (120), a voltage measuring unit (130), and a controller (140).

[0039] Each component may correspond to a sub-element that constitutes a BMS (Battery Management System) applied to a vehicle. Meanwhile, the battery (BAT) indicated below may mean a unit battery cell (Battery Cell) or may mean a battery pack (Battery Pack) formed by stacking battery cells. The resistance measuring device (100) may be electrically connected to the battery (BAT). The resistance measuring device (100) may be electrically connected to the positive terminals of the battery (BAT) to measure the insulation of the battery (BAT).

[0040] The resistance unit (110) may include first to third resistors (111, 112, 113). The resistance unit (110) may be a resistor connected to a circuit to measure insulation resistance in a resistance measuring device (100). The resistance measuring device (100) may measure insulation resistance by measuring a voltage applied to the resistance unit (110).

[0041] The first resistor (111) may be connected to the positive (+) terminal of the battery (BAT). The first resistor (111) may be connected between the positive (+) terminal of the battery (BAT) and the first switch (121). The first resistor (111) may serve as a reference resistor for measuring the positive insulation resistance of the battery.

[0042] The second resistor (112) may be connected to the negative pole (-) of the battery (BAT). The second resistor (112) may be connected between the negative pole (-) of the battery (BAT) and the second switch (122). The second resistor (112) may serve as a reference resistor for measuring the negative pole insulation resistance of the battery.

[0043] The third resistor (113) can be connected to ground (GND). The third resistor (113) can be connected between the positive (+) terminal of the battery (BAT) and ground (GND), or between the negative (-) terminal of the battery (BAT) and ground (GND). In addition, the third resistor (113) can be connected between the third switch (123) and ground (GND). The resistance measuring device (100) can measure the insulation resistance by measuring the voltage applied to the third resistor (113).

[0044] The switch unit (120) may include first to third switches (121, 122, 123). The switch unit (120) may be arranged on a circuit to form a current path through on / off control. The on / off of the switch unit (120) may be controlled by a controller (140). The switch unit (120) may be turned on or off by receiving a control signal from the controller (140). The switch unit (120) may be implemented with various elements within a range capable of controlling current flow, such as a relay, BJT, or FET. For example, the switch unit (120) may include a photo MOS.

[0045] The first switch (121) may be connected to the positive (+) terminal of the battery (BAT). In addition, the first switch (121) may be connected between the first resistor (111) and the third switch (123). The first switch (121) may be turned on or off by receiving a control signal from the controller (140). The first switch (121) may be a positive switch. The first switch (121) may be turned on when measuring the positive insulation resistance of the battery (BAT).

[0046] The second switch (122) may be connected to the negative (-) terminal of the battery (BAT). In addition, the second switch (122) may be connected between the second resistor (112) and the third switch (123). The second switch (122) may be turned on or off by receiving a control signal from the controller (140). The second switch (122) may be a negative switch. The second switch (122) may be turned on when measuring the negative insulation resistance of the battery (BAT).

[0047] The third switch (123) may be placed between the first switch (121) and the second switch (122). In addition, the third switch (123) may be connected to ground (GND). A third resistor (113) and a reference voltage unit (Vref) may be connected between the third switch (123) and ground (GND). The third switch (123) may be turned on or off by receiving a control signal from the controller (140). The third switch (123) may be a neutral switch. The third switch (123) may be turned on both when measuring the positive insulation resistance of the battery (BAT) and when measuring the negative insulation resistance.

[0048] The voltage measuring unit (130) can measure voltage. The voltage measuring unit (130) can measure the voltage applied to the third resistor (113). The voltage measuring unit (130) can measure the positive insulation resistance or the negative insulation resistance by measuring the voltage applied to the second resistor (113). The voltage measuring unit (130) can be connected between the third resistor (113) and the controller (140). The voltage measuring unit (130) can transmit the measured voltage to the controller (140).

[0049] The controller (140) can control the on / off of the switch unit. The controller (140) can generate a signal that can turn on or off the first to third switches (121, 122, 123) and transmit the signal to the first to third switches (121, 122, 123), respectively. In addition, the controller (140) can receive voltage measurement information from the voltage measurement unit (130). The controller (140) can calculate a positive insulation resistance value or a negative insulation resistance value from the voltage value. The controller (140) can determine the insulation status of the insulation resistance from the insulation resistance value. The controller (140) can determine that the battery is not insulated when the insulation resistance value is less than a preset reference resistance value. For example, the controller (140) can determine that the battery is not insulated when the measured insulation resistance value is less than 1 mΩ. The controller may include a Micro Controller Unit (MCU).

[0050] Additionally, the resistance measuring device (100) may include a reference voltage unit (Vref) connected to a third resistor (113). The reference voltage unit (Vref) may supply a direct current voltage. The reference voltage unit (Vref) may supply a reference voltage for measuring a voltage applied to the third resistor (113). The reference voltage unit (Vref) may be connected to ground (GND).

[0051] Figures 4 and 5 are exemplary diagrams showing the process of measuring insulation resistance in a resistance measuring device according to an embodiment.

[0052] Referring to FIG. 4, when the resistance measurement device measures the positive insulation resistance of the battery (BAT), the first switch (121) and the third switch (123) can be turned on, and the second switch (122) can be turned off. When the first switch (121) and the third switch (123) are turned on, current can flow through the first switch (121) and the third switch (123). Therefore, the current supplied from the positive (+) of the battery (BAT) can pass through the first switch (121) via the first resistor (111), and can pass through the third switch (123) to reach the third resistor (113). As a result, the voltage measurement unit (130) can be connected to the third resistor (113) to measure the voltage applied to the third resistor (113).

[0053] Referring to FIG. 5, when the resistance measurement device measures the negative insulation resistance of the battery (BAT), the second switch (122) and the third switch (123) can be turned on, and the first switch (121) can be turned off. When the second switch (122) and the third switch (123) are turned on, current can flow through the second switch (122) and the third switch (123). Therefore, the current supplied from the reference voltage unit (Vref) can pass through the third resistor (113) to the third switch (123), and can pass through the second switch (122) to reach the second resistor (112). As a result, the voltage measurement unit (130) can be connected to the third resistor (113) to measure the voltage applied to the third resistor (113).

[0054] The third switch (123) of the resistance measuring device according to the embodiment can be turned on and used when measuring both positive insulation resistance and negative insulation resistance. Therefore, the resistance measuring device can reduce the number of switches required for resistance measurement by including the third switch (123), thereby simplifying the configuration of the device required for insulation resistance measurement, and reducing the cost required for insulation resistance measurement.

[0055] Figure 6 is a flowchart of a resistance measurement method according to an embodiment.

[0056] Referring to FIG. 6, a resistance measurement method (S1000) according to an embodiment may include a step of turning on a neutral switch (S100), a step of turning on a positive switch (S200), and a step of measuring positive insulation resistance in a controller (S300). In addition, the resistance measurement method according to an embodiment may include a step of turning off a positive switch (S400), a step of turning on a negative switch (S500), a step of measuring negative insulation resistance in a controller (S600), and a step of turning off a negative switch (700).

[0057] The resistance measurement method (S1000) can measure the positive insulation resistance while turning on the neutral switch and the positive switch and turning off the negative switch. In addition, the resistance measurement method (S1000) can measure the negative insulation resistance while turning on the neutral switch and the negative switch and turning off the positive switch.

[0058] In the resistance measurement method according to the embodiment, the neutral switch can be turned on and used for both positive and negative insulation resistance measurements. Therefore, by using a neutral switch in the resistance measurement method, the number of switches required for resistance measurement can be reduced, thereby simplifying the configuration of the device required for insulation resistance measurement, and reducing the cost required for insulation resistance measurement.

[0059] Although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be construed as being included within the scope of the present invention defined in the appended claims.

Claims

1. A first switch connected to the positive terminal of the battery; A second switch connected to the negative terminal of the battery; a third switch connected between the first switch and the second switch; and A resistance measuring device including a voltage measuring unit connected to the third switch.

2. In paragraph 1, A resistance measuring device comprising a first resistor connected between the positive electrode of the battery and the first switch, and a second resistor connected between the negative electrode of the battery and the second switch.

3. In paragraph 2, A resistance measuring device including a third resistor connected between the third switch and the voltage measuring unit.

4. In paragraph 3, The above voltage measuring unit is a resistance measuring device that measures the voltage applied to the third resistor.

5. In paragraph 4, Including a reference voltage section connected to the third resistor, The above reference voltage section is a resistance measuring device connected to ground.

6. In paragraph 5, A resistance measuring device comprising a controller connected to the above voltage measuring unit.

7. In paragraph 6, A resistance measuring device that measures the positive electrode insulation resistance of the battery when the first switch and the third switch are turned on.

8. In paragraph 6, A resistance measuring device that measures the negative electrode insulation resistance of the battery when the second switch and the third switch are turned on.

9. In paragraph 7 or 8, The above controller is a resistance measuring device that measures the positive insulation resistance or the negative insulation resistance according to the voltage measured by the voltage measuring unit.

10. In paragraph 9, The above controller is a resistance measuring device that determines that the battery is not insulated when the positive insulation resistance or the negative insulation resistance is less than a preset reference resistance value.

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