Current measuring device

Abstract

Disclosed is a current measuring device configured to quickly interrupt current. The current measuring device includes: a first terminal; a second terminal; a resistor interposed in a separation space between the first and second terminals; a circuit board; a control unit mounted on the circuit board and configured to measure current flowing in the resistor by using a voltage value between the first and second terminals and a resistance value of the resistor; and a cutoff unit located above or below the resistor and configured to cut off the resistor according to a control signal from the control unit.

Description

Technical Field

[0001] This application claims priority from Korean Patent Application No. 10-2020-0089756 filed in Korea on Jul. 20, 2020, the disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates to a current measuring device, and more particularly, to a current measuring device configured to quickly block current by itself when an abnormal current flows, and a battery pack and a vehicle including the current measuring device. Background Art

[0003] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries have attracted attention because they have substantially no memory effect compared to nickel-based secondary batteries, thereby ensuring free charge and discharge, and have a very low discharge rate and high energy density.

[0004] Lithium secondary batteries mainly use lithium oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. Lithium secondary batteries include: an electrode assembly, in which a positive electrode plate and a negative electrode plate coated with a positive electrode active material and a negative electrode active material, respectively, are arranged with a separator interposed therebetween; and an outer member (i.e., a battery case) for airtightly receiving the electrode assembly together with an electrolyte.

[0005] In particular, in recent years, as the use of electric vehicles and portable devices such as smartphones and laptop computers has become increasingly widespread, interest in battery packs used therefor has focused, and research is being actively conducted.

[0006] As the application areas of battery packs continue to expand as described above, battery pack safety has become a critical issue. In particular, the number of electric vehicle users is rapidly increasing, and failure to ensure battery safety can lead to vehicle damage and passenger casualties. Furthermore, if a problem occurs in the battery pack while the electric vehicle is operating, it can cause a traffic accident, resulting in serious personal injury and property damage. Accordingly, battery packs are typically equipped with various management devices to manage the charging and discharging of the battery pack and ensure safety.

[0007] Such a device for ensuring the safety of a battery pack may include various components. Typically, these components may include: a current sensor that is provided on a path through which charging and discharging currents flow; and a control device, such as a battery management system (BMS), that blocks the charging and discharging paths when an overcurrent occurs. In this configuration, current sensing information measured by the current sensor is transmitted to the control device, and the control device may operate a current blocking element, such as a fuse, a switch, or a relay, based on the current sensing information.

[0008] However, this overcurrent blocking configuration may not operate quickly. That is, in the case of an overcurrent blocking configuration, communication must be performed between the current sensor and the control unit, and thus a time delay may occur. For example, current sensing information measured by the current sensor is transmitted to the BMS, and the BMS can check whether there is an overcurrent based on the transmitted current sensing information, and then transmit a signal to the current blocking element to block the charging and discharging paths. However, according to this current blocking configuration, since the current sensing information must be transmitted to a control device (such as a BMS), and a control signal for blocking the current must be transmitted from the control device (such as a BMS) to the current blocking element, the current blocking operation may not be performed quickly. Summary of the Invention

[0009] Technical issues

[0010] The present disclosure is designed to solve the problems of the related art, and thus the present disclosure aims to provide a current measuring device, a battery pack, and a vehicle including the current measuring device, which can quickly perform a current blocking function by itself without using a separate control device (such as a BMS).

[0011] These and other purposes and advantages of the present disclosure can be understood from the following detailed description and will become more fully apparent from the exemplary embodiments of the present disclosure. Moreover, it will be readily understood that the purposes and advantages of the present disclosure can be achieved by the means shown in the appended claims and their combinations.

[0012] Technical Solution

[0013] In one aspect of the present disclosure, a current measuring device is provided, the current measuring device including: a first terminal made of a conductive material; a second terminal made of a conductive material and positioned to be spaced apart from the first terminal by a predetermined distance; a resistor interposed in a separation space between the first terminal and the second terminal and made of a conductive material having a larger specific resistance than the first terminal and the second terminal; a circuit board having an electrical path, the circuit board being located at sides of the first terminal and the second terminal and being electrically connected to the first terminal and the second terminal, respectively; a control unit mounted on the circuit board and configured to measure a current flowing in the resistor by using a voltage value between the first terminal and the second terminal and a resistance value of the resistor; and a cut-off unit located above or below the resistor and configured to cut off the resistor according to a control signal of the control unit.

[0014] Here, the first terminal and the second terminal may be configured in a plate shape and positioned on the same plane as the circuit board.

[0015] In addition, the circuit board may include: a main body portion, which is located at the side of the first terminal and the second terminal; a first extension portion, which is formed to extend from the main body portion in a horizontal direction and is configured to be placed on the surface of the first terminal; and a second extension portion, which is configured to be placed on the surface of the second terminal.

[0016] In addition, the cutting unit may be configured to be at least partially placed on surfaces of the first extension portion and the second extension portion.

[0017] In addition, the cutoff unit may be configured to protrude further outward from the first extension portion and the second extension portion in the horizontal direction.

[0018] In addition, the circuit board may be configured to be detachably attached to the first terminal and the second terminal.

[0019] In addition, gunpowder may be contained in the cutoff unit, and the cutoff unit may be configured to cut off the resistor by exploding the gunpowder.

[0020] In addition, the cutting unit may include: an explosion part, which is located above or below the resistor and is configured to apply a cutting force caused by the explosion to the resistor; a pressing part, which is configured to squeeze the resistor by the explosion force of the explosion part; and a cover part, which is positioned opposite to the pressing part based on the resistor and is configured to prevent the resistor cut off by the pressing force of the pressing part from dispersing.

[0021] In addition, the circuit board may include a heat dissipation member provided on a surface of the circuit board; and a heat transfer material interposed between the heat dissipation member and at least one of the first terminal, the resistor, and the second terminal.

[0022] In another aspect of the present disclosure, a battery pack is provided. The battery pack includes the current measuring device according to the present disclosure.

[0023] In another aspect of the present disclosure, a vehicle is further provided. The vehicle includes the current measuring device according to the present disclosure.

[0024] Beneficial effects

[0025] According to the present disclosure, when an abnormal situation such as an overcurrent occurs, the overcurrent can be quickly blocked.

[0026] In particular, according to an embodiment of the present disclosure, when an overcurrent is measured by a current measuring device, there is no need to communicate with a control device (such as a BMS) to block the overcurrent.

[0027] Therefore, it is possible to quickly prevent a problem caused by an overcurrent by shortening an operation time for blocking the overcurrent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, are used to provide further understanding of the technical features of the present disclosure. Therefore, the present disclosure is not to be construed as being limited to the accompanying drawings.

[0029] Figure 1 is an assembly perspective view schematically showing the configuration of a current measuring device according to an embodiment of the present disclosure.

[0030] Figure 2 yes Figure 1 Exploded perspective view.

[0031] Figure 3 is an exploded perspective view schematically showing the configuration of a current measuring device according to an embodiment of the present disclosure.

[0032] Figure 4 is an exploded perspective view schematically showing the configuration of a current measuring device according to another embodiment of the present disclosure.

[0033] Figure 5 yes Figure 4 Assembly perspective view.

[0034] Figure 6 It is along Figure 5 A cross-sectional view taken along line A1-A1'.

[0035] Figure 7is a perspective view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure.

[0036] Figure 8 It shows Figure 7 An enlarged cross-sectional view of portion A2.

[0037] Figure 9 is a front sectional view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure.

[0038] Figure 10 is a perspective view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure.

[0039] Figure 11 It is along Figure 10 A cross-sectional view taken along line A5-A5'.

[0040] Figure 12 is a perspective view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure.

[0041] Figure 13 It is along Figure 12 A cross-sectional view taken along line A6-A6'.

[0042] Figure 14 is an exploded perspective view schematically showing a partial configuration of a current measuring device according to still another embodiment of the present disclosure.

[0043] Figure 15 is a side sectional view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure.

[0044] Figure 16 is a side sectional view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in the specification and the appended claims should not be understood as limited to the general and dictionary meanings, but should be interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure on the basis of the principle that allows the inventor to appropriately define the terms for the best interpretation.

[0046] Therefore, the descriptions presented herein are merely preferred examples for illustration only and are not intended to limit the scope of the present disclosure, and it should be understood that other equivalents and modifications may be made thereto without departing from the scope of the present disclosure.

[0047] Figure 1is an assembly perspective view schematically showing the configuration of a current measuring device according to an embodiment of the present disclosure, and Figure 2 yes Figure 1 Exploded perspective view.

[0048] refer to Figure 1 and Figure 2 , the current measuring device according to the present disclosure includes a first terminal 100 , a second terminal 200 , a resistor 300 , a circuit board 400 , a control unit 500 , and a cut-off unit 600 .

[0049] The first terminal 100 and the second terminal 200 may be made of a conductive material. For example, the first terminal 100 and the second terminal 200 may be made of a metal material such as copper.

[0050] The first terminal 100 and the second terminal 200 can be connected to one side and the other side of the path through which the current flows, respectively. For example, when the current measuring device according to the present disclosure is used on the charging and discharging paths of the battery pack, the ends of the first terminal 100 and the second terminal 200 can be connected to different charging and discharging busbars constituting the same charging and discharging paths of the battery pack, respectively. For this purpose, as indicated by H1 in the accompanying drawings, the first terminal 100 and the second terminal 200 can have terminal holes so that the terminal holes are connected to the holes of the charging and discharging busbars of the battery pack by bolting.

[0051] The first terminal 100 and the second terminal 200 may be placed to be spaced apart from each other by a predetermined distance. Figure 2 In the configuration, the first terminal 100 and the second terminal 200 may be configured to be spaced apart by a predetermined distance in the left-right direction (the x-axis direction of the drawing).

[0052] The resistor 300 may be configured to be interposed in a separation space between the first terminal 100 and the second terminal 200. In addition, the resistor 300 may be configured to be fixedly coupled to the first terminal 100 and the second terminal 200. For example, the resistor 300 may have one end (left end) coupled and fixed to the first terminal 100 and the other end (right end) coupled and fixed to the second terminal 200. In this case, the resistor 300 and the first terminal 100 and / or the second terminal 200 may be coupled by welding or the like, but various other coupling types may also be employed.

[0053] The resistor 300 may be made of a conductive material having a greater resistance value, particularly a greater specific resistance, than the first terminal 100 and the second terminal 200. For example, the resistor 300 may be made of an alloy material containing at least two or more of manganese (Mn), nickel (Ni), and copper (Cu).

[0054] The materials, structures, shapes, etc. of the first terminal 100 , the second terminal 200 , and the resistor 300 may adopt those of a current sensor having a shunt resistor known at the time of filing this application.

[0055] Similar to a printed circuit board (PCB), the circuit board 400 is configured in a plate shape and can be configured to form an electrical path on the surface of the circuit board 400 or at the inner side of the circuit board 400. In addition, the circuit board 400 can be located at the side of the first terminal 100 and the second terminal 200. In particular, the circuit board 400 can be configured to be located at the side not in the direction of connecting the first terminal 100 and the second terminal 200 but in a direction orthogonal to the direction of connecting the first terminal 100 and the second terminal 200. For example, see Figure 1 and Figure 2 In the configuration, the first terminal 100 and the second terminal 200 can be configured to be coupled in the left-right direction (the x-axis direction of the drawing) with the resistor 300 interposed therebetween, and the circuit board 400 can be configured to be coupled in the front-back direction (the y-axis direction of the drawing). For example, the circuit board 400 can be configured to be located at the front ends of the first terminal 100, the second terminal 200, and the resistor 300.

[0056] The circuit board 400 can be configured to be electrically connected to the first terminal 100 and the second terminal 200, respectively. For example, as shown in the accompanying drawings, the circuit board 400 may include a plurality of measuring wires 401 made of a material capable of transmitting electrical signals. In addition, the circuit board 400 may be electrically connected to the first terminal 100 via one measuring wire 401 and may be electrically connected to the second terminal 200 via another measuring wire 401. In addition, the measuring wires 401 may be connected and fixed to a conductor pattern formed on the circuit board 400, etc. In this case, the bonding and fixing between the measuring wires 401 and the terminals 100 and 200 and / or between the measuring wires 401 and the circuit board 400 may be performed by welding, etc., but various other bonding and fixing methods may also be implemented.

[0057] The control unit 500 may be mounted on the circuit board 400 and configured to measure the magnitude of the current flowing through the resistor 300. More specifically, the control unit 500 may obtain the potential between the first terminal 100 and the second terminal 200 through the measuring line 401. In addition, the control unit 500 may pre-store the resistance value of the resistor 300 in a memory or the like. Accordingly, the control unit 500 may measure the magnitude of the current flowing through the resistor 300 by using the obtained voltage value between the first terminal 100 and the second terminal 200 and the pre-stored resistance value of the resistor 300.

[0058] The control unit 500 may be implemented in various forms known in the art, such as a processor or a chipset. The control unit 500 may execute various control logics for measuring current and may be mounted on the circuit board 400 .

[0059] The cut-off unit 600 may be located above or below the resistor 300. For example, Figure 1 and Figure 2 As shown in , the cut-off unit 600 may be configured to be placed on the upper surface of the resistor 300. In this case, the cut-off unit 600 may be configured to be also placed on the upper or lower portion of the first and second terminals 100 and 200 and the resistor 300. For example, as shown in Figure 1 and Figure 2 As shown in , a lower portion of the cut-off unit 600 can be placed in contact with the upper surface of the first terminal 100, another lower portion of the cut-off unit 600 can be placed in contact with the upper surface of the resistor 300, and another lower portion of the cut-off unit 600 can be placed in contact with the upper surface of the second terminal 200.

[0060] The cut-off unit 600 can be configured to cut off the resistor 300 according to the control signal of the control unit 500. In other words, the control unit 500 can control the cut-off unit 600 to cut off the resistor 300. For this purpose, the control unit 500 and the cut-off unit 600 can be configured to send and receive electrical signals to each other. For example, the control unit 500 and the cut-off unit 600 can be configured to be electrically connected to each other through components such as a flexible printed circuit board (FPCB) or a wire. In this case, the contact points between the FPCB and the control unit 500 and / or the cut-off unit 600 can be coated with a waterproof material. Moreover, the control unit 500 and the cut-off unit 600 can be configured to exchange signals with each other via the electrical path (i.e., conductor pattern) of the circuit board 400.

[0061] The control unit 500 may be configured to transmit a control signal for disconnection to the disconnection unit 600 when the current flowing through the resistor 300 is equal to or greater than a reference current. In this case, the reference current may be pre-stored in a memory device or the like of the control unit 500. In addition, upon receiving the control signal for disconnection from the control unit 500, the disconnection unit 600 may be configured to disconnect the resistor 300.

[0062] The cut-off unit 600 may be configured to cut off the resistor 300 by applying a physical force to the resistor 300. In addition, by physically separating the resistor 300, the flow of current through the first terminal 100, the resistor 300, and the second terminal 200 may be blocked. That is, if the resistor 300 is separated from the first terminal 100 and the second terminal 200, the electrical connection between the first terminal 100 and the second terminal 200 is cut off, and the flow of current through the first terminal 100, the resistor 300 and the second terminal 200 may no longer be formed.

[0063] In particular, in the current measuring device according to the present disclosure, the cut-off unit 600 can be configured to squeeze only the resistor 300 relative to the assembly of the first terminal 100, the resistor 300, and the second terminal 200. In this case, the assembly of the first terminal 100, the resistor 300, and the second terminal 200 can be separated more easily. That is, the resistor 300 can be connected and fixed to the first terminal 100 and the second terminal 200 by welding, etc., and the connection and fixing parts between the resistor 300 and the first terminal 100 and between the resistor 300 and the second terminal 200 can be separated at one time by applying physical force to the resistor 300. Therefore, in this case, the current can be blocked more quickly.

[0064] In addition, according to the configuration of the present disclosure, the current blocking performance can be stably ensured with a simple structure. In particular, in an embodiment of the present disclosure, the circuit board 400 can be located at the side surface of the first terminal 100, the resistor 300 and the second terminal 200, and the cut-off unit 600 can be located above or below the first terminal 100, the resistor 300 and the second terminal 200. Therefore, the cut-off unit 600 can not interfere with the connecting parts, such as the connecting pins for measurement, or the measuring line 401 for connection between the first terminal 100 and the circuit board 400 and between the second terminal 200 and the circuit board 400. In particular, the measuring line 401 etc. do not need to be set to a long shape. Therefore, the accuracy for current measurement and the structural coupling force between the circuit board 400 and the first terminal 100 and between the circuit board 400 and the second terminal 200 can be further improved.

[0065] Furthermore, embodiments of the present disclosure advantageously achieve a compact current measuring device. Specifically, the current measuring device can achieve both current measurement and current blocking performance without excessively increasing its volume. Consequently, when the current measuring device is mounted on a battery pack, etc., the design of the battery pack, etc., can be simplified, while preventing an increase in the volume of the battery pack, etc.

[0066] In addition, according to an embodiment of the present disclosure, the cut-off unit 600 can be placed above the resistor 300. In this case, the upper portion of the resistor 300 can be covered by the cut-off unit 600, thereby more effectively preventing moisture or water present inside the current measuring device from being introduced toward the resistor 300. In particular, if moisture or water exists in the resistor 300, the accuracy of the current measurement may deteriorate. According to this embodiment of the present disclosure, the cut-off unit 600 prevents moisture or water droplets from being introduced toward the upper portion of the resistor 300, thereby preventing the accuracy of the current measurement from deteriorating.

[0067] At the same time, as in Figure 1 and Figure 2 As shown in FIG, the circuit board 400 may include a connector 402 for communicating with an external device. For example, when the current measuring device according to the present disclosure is installed in a battery pack, the battery management system (BMS) provided in the battery pack may be connected to the current measuring device via the connector 402. In addition, the BMS may receive current measurement information from the current measuring device via the connector 402. Moreover, in addition to the connector 402 and the control unit 500, the circuit board 400 may further include various other components.

[0068] As in Figure 1 and Figure 2 As shown in FIG, the first terminal 100 and the second terminal 200 may be configured in a plate shape. For example, the first terminal 100 and the second terminal 200 may be configured in the form of a copper plate.

[0069] In addition, the circuit board 400 may also be configured to be in a plate shape. In this case, the first terminal 100 and the second terminal 200 may be configured to be located on the same plane as the circuit board 400. More specifically, the first terminal 100 and the second terminal 200 may be configured to have two wide surfaces paved and oriented up and down. In addition, the circuit board 400 may also be configured to have two wide surfaces paved and oriented up and down.

[0070] In this case, the first terminal 100, the second terminal 200 and the circuit board 400 may be configured to be located on the same plane. For example, the first terminal 100, the second terminal 200 and the circuit board 400 may all have lower surfaces parallel to the xy plane.

[0071] According to this configuration of the present disclosure, a current measuring device with a more compact size can be realized. In addition, according to this embodiment, the first terminal 100, the second terminal 200 and the circuit board 400 can be stably mounted on the bottom surface of the current measuring device.

[0072] Figure 3 : is an exploded perspective view schematically showing the configuration of a current measuring device according to an embodiment of the present disclosure. Figure 3In this section, we will describe in detail the difference between Figure 1 and Figure 2 features of the previous embodiments.

[0073] refer to Figure 3 The current measuring device according to the present disclosure may further include a housing 700. The housing 700 is an outer material of the current measuring device and may be configured to have an inner space for accommodating at least a portion of other components of the current measuring device (such as the first terminal 100, the second terminal 200, the resistor 300, the circuit board 400, the control unit 500, and the cut-off unit 600).

[0074] For example, the housing 700 may be configured to include a lower housing 701 and an upper housing 702. Specifically, an internal space is formed in the lower housing 701 to accommodate other components of the current measuring device, but an open portion may be formed at the top end of the lower housing 701. Furthermore, the upper housing 702 may be coupled to the open portion at the top end of the lower housing 701.

[0075] The housing 700 can protect the various components disposed therein from external physical and chemical factors. However, the housing 700 (e.g., the lower housing 701) can be configured so that the first terminal 100 and the second terminal 200 are partially exposed to the outside for electrical connection to the charging and discharging busbars, etc. In addition, the housing 700 can also be configured so that the connector 402 is exposed to the outside so that an external device such as a BMS can be easily connected to the connector 402, etc.

[0076] Figure 4 is an exploded perspective view schematically showing the configuration of a current measuring device according to another embodiment of the present disclosure, Figure 5 yes Figure 4 An assembly perspective view of Figure 6 It is along Figure 5 In this embodiment, features different from those of the previous embodiment will be described in detail, and features identical or similar to those of the previous embodiment will not be described in detail.

[0077] refer to Figures 4 to 6 The circuit board 400 may include a body portion 410 and an extension portion. Specifically, the extension portion may include a first extension portion 421 and a second extension portion 422 .

[0078] The body portion 410 is a structure located at the side of the first terminal 100 and the second terminal 200, and can be regarded as having the same Figure 1 and Figure 2 The circuit board 400 may be configured accordingly. Accordingly, a conductor pattern may be formed on the body portion 410 , and the control unit 500 may be mounted to the body portion 410 .

[0079] The first extension portion 421 may be formed to extend in a horizontal direction from the body portion 410. Figure 4 As shown in , the first extension portion 421 may be configured to extend in the y-axis direction, particularly in the -y-axis direction, on the xy plane. Figure 4 and Figure 5 As shown in , the first extension portion 421 may be configured to be placed on a surface of the first terminal 100 , for example, an upper surface of the first terminal 100 .

[0080] The second extension portion 422 may be configured to extend from the body portion 410 in a horizontal direction, particularly, in a direction parallel to the extending direction of the first extension portion 421. Figure 4 , similar to the first extension portion 421, the second extension portion 422 may be configured to extend in the -y axis direction. Figures 4 to 6 As shown in , the second extension portion 422 may be configured to be placed on a surface of the second terminal 200 , for example, an upper surface of the second terminal 200 .

[0081] According to this configuration of the present disclosure, the connection between the circuit board 400 and the resistor assembly, which is an assembly of the first terminal 100, the resistor 300, and the second terminal 200, can be improved. In particular, because the first extension 421 and the second extension 422 are placed on the upper or lower portion of the first terminal 100 and the second terminal 200, it is possible to limit the upward or downward movement of the first terminal 100 and the second terminal 200. Accordingly, the mechanical connection between the resistor assembly and the circuit board 400 can be improved.

[0082] In addition, the circuit board 400 and each terminal can be electrically connected through the first extension portion 421 and the second extension portion 422. For example, the conductor pattern formed on the main body 410 can extend to the first extension portion 421 and the second extension portion 422. In addition, the conductor pattern formed on the first extension portion 421 and the second extension portion 422 can be connected to the first terminal 100 and the second terminal 200. For example, when the conductor pattern of the first extension portion 421 and the second extension portion 422 is formed to be buried inside the polymer layer, at least a portion of the conductor pattern can be configured to be exposed to the outside of the polymer layer. In addition, the exposed portion of the conductor pattern as described above can contact the first terminal 100 and the second terminal 200 to be electrically connected to the first terminal 100 and the second terminal 200. According to this embodiment of the present disclosure, the circuit board 400 and each terminal can be electrically connected more easily. In particular, in this embodiment, electrical connection elements such as may be not included on the outside of the circuit board 400. Figure 1 and Figure 2 The measurement line 401 is shown in FIG.

[0083] Meanwhile, in this embodiment, the thickness of the circuit board 400 , particularly the thickness of the body portion 410 , may be configured to be greater than the thicknesses of the first terminal 100 and the second terminal 200 .

[0084] For example, see Figure 6 In the illustrated configuration, in the circuit board 400 , assuming that the vertical thickness of the body portion 410 is t1 and the vertical thickness of the second terminal 200 is t2 , t1 and t2 may be configured to establish the following relationship.

[0085] t1>t2.

[0086] In particular, assuming that the vertical thickness of the second extension portion 422 extending from the body portion 410 of the circuit board 400 is t3, the following relationship may be established for t1, t2, and t3.

[0087] t1≥t2+t3.

[0088] In particular, t1 may be equal to the sum of t2 and t3.

[0089] According to this configuration of the present disclosure, the thickness of the laminated body of the second extension portion 422 and the second terminal 200 is the same as the thickness of the body portion 410. Accordingly, the lower surface of the body portion 410 can be located on the same plane as the lower surface of the second terminal 200, and the upper surface of the body portion 410 can be located on the same plane as the upper surface of the second extension portion 422. In addition, this configuration can be applied to the first extension portion 421 and the first terminal 100. Accordingly, the combined state between the circuit board 400, the terminal, and the cut-off unit 600 can be maintained more stably.

[0090] As described above, in the embodiment where the first extension portion 421 and the second extension portion 422 are provided on the circuit board 400 , the cutoff unit 600 may be configured to be at least partially placed on surfaces of the first extension portion 421 and the second extension portion 422 .

[0091] For example, as in Figure 4 and Figure 5 As shown in FIG, a lower portion of one side (eg, lower left side) of the cutting unit 600 may be placed on the first extension 421 , and a lower portion of the other side (eg, lower right side) of the cutting unit 600 may be placed on the second extension 422 .

[0092] According to this configuration of the present disclosure, the connection between the cutting unit 600 and the circuit board 400 can be improved. For example, because the outside of the first extension 421 and the second extension 422 of the circuit board 400 (i.e., the upper surface of the first extension 421 and the second extension 422) is configured to be flat, the cutting unit 600 can be stably placed on this flat surface. In addition, according to this configuration, because an empty space is formed between the first extension 421 and the second extension 422 above the resistor 300, it is possible to ensure that the cutting structure for positioning the cutting unit 600 to cut off the space of the resistor 300. In addition, according to this configuration, when the resistor 300 is cut by the cutting unit 600, the first extension 421 and the second extension 422 are used to block the fragments of the resistor 300, thereby preventing the fragments from being dispersed to the outside. Moreover, according to this configuration, because the cutting unit 600 and the resistor assembly can not directly contact each other, it is possible to prevent the accuracy of the current measurement from being degraded due to current leakage or contact resistance.

[0093] Figure 7 is a perspective view schematically showing the configuration of a current measuring device according to yet another embodiment of the present disclosure, and Figure 8 It shows Figure 7 In this embodiment, features different from those of the previous embodiment will be described in detail.

[0094] refer to Figure 7 and Figure 8 , the cutting unit 600 may be configured to further protrude to the first extension portion 421 and the second extension portion 422 in the outer horizontal direction. That is, the cutting unit 600 may include a lower protrusion 601 that further protrudes outward from the first extension portion 421 and the second extension portion 422. For example, referring to Figure 8 , the lower right end of the cutting unit 600 is placed on the second extension portion 422, and the right end of the cutting unit 600 can be configured to further protrude from the second extension portion 422 in the right direction (+x axis direction in the drawing), thereby forming a lower protrusion 601. Moreover, the lower protrusion 601 can be configured to bend downward (-z axis direction in the drawing) in the form of surrounding the outer side of the second extension portion 422 in a state of further extending to the right from the second extension portion 422. That is, the lower protrusion 601 of the cutting unit 600 can be configured to bend in the form of surrounding the outer side of the second extension portion 422. In addition, although Figure 8Although the configuration is shown between the lower right end of the cutting unit 600 and the second extension 422, the lower protrusion 601 may be configured in a similar shape between the lower left end of the cutting unit 600 and the first extension 421. That is, the lower protrusion 601 configured to be bent so as to surround the outer side (i.e., the left side) of the first extension 421 may be provided at the lower left side of the cutting unit 600.

[0095] According to this configuration of the present disclosure, because the first and second extensions 421 and 422 of the circuit board 400 are surrounded by the lower protrusion 601 of the cut-off unit 600, it is possible to more effectively prevent foreign matter (particularly moisture, etc.) from being introduced toward the resistor 300. Specifically, according to this configuration, the lower protrusion 601 prevents the gap between the lower surface of the cut-off unit 600 and the upper surface of the first or second extension 421 and 422 from being exposed to the outside. Accordingly, it is possible to more reliably prevent foreign matter (such as moisture) from being introduced horizontally toward the resistor 300 located between the first and second extensions 421 and 422. Furthermore, under high humidity or rainy conditions, water droplets may flow downward along the surface of the cut-off unit 600. However, in such situations, the water droplets can be prevented from moving toward the lower protrusion 601 and penetrating toward the resistor 300. Furthermore, the lower protrusion 601 can cover the side surfaces of the first and second extensions 421 and 422, protecting them from external impacts and the like.

[0096] Figure 9 is a front sectional view schematically showing the configuration of a current measuring device according to still another embodiment of the present disclosure. Figure 9 can be considered along Figure 5 In this embodiment, features different from those of the previous embodiment will be described in detail.

[0097] refer to Figure 9 , the current measuring device according to the present disclosure may be configured such that the outer upper portions of the first extension portion 421 and the second extension portion 422 are chamfered. Figure 9 As indicated by A3 in FIG. 1 , the first extension portion 421 may be configured such that the upper left corner of the first extension portion 421 is inclined. Figure 9 As indicated by A3' in FIG. 4 , the second extension portion 422 may be configured such that the upper right corner is inclined. Furthermore, the chamfered portion may be configured in a curved shape. In particular, in this embodiment, the chamfered portion may be formed in a region located outside the cutting unit 600 in the horizontal direction.

[0098] According to this configuration of the present disclosure, it is possible to more reliably prevent moisture and the like from penetrating toward the resistor 300. In particular, when water droplets flow along the outer surface of the cut-off unit 600, water droplets that fall onto the first extension portion 421 or the second extension portion 422 can more easily flow in a direction opposite to the resistor 300 due to the chamfered portion. Therefore, it is possible to more reliably prevent the accuracy of current measurement from being degraded due to moisture penetrating toward the resistor 300.

[0099] Figure 10 is a perspective view schematically showing the configuration of a current measuring device according to yet another embodiment of the present disclosure, and Figure 11 It is along Figure 10 A cross-sectional view taken along line A5-A5'. Figure 10 , for convenience of explanation, the cutting unit 600 is not shown. In this embodiment, features different from those of the previous embodiment will be described in detail.

[0100] refer to Figure 10 and Figure 11 , the circuit board 400 of the current measuring device according to the present disclosure may include a third extension portion 423. Here, the third extension portion 423 may be configured to connect the end of the first extension portion 421 and the end of the second extension portion 422 to each other. For example, the left end of the third extension portion 423 may be connected to the rear end of the first extension portion 421, and the right end of the third extension portion 423 may be connected to the rear end of the second extension portion 422. In addition, the cutting unit 600 may be placed on the third extension portion 423. That is, as in Figure 11 As shown in , the rear end of the cutting unit 600 may be placed on the third extension portion 423. In this case, the cutting unit 600 may be considered to be placed on all of the first extension portion 421, the second extension portion 422, and the third extension portion 423. Figure 11 As shown in , the cutting unit 600 may be partially placed on the body part 410 .

[0101] According to this configuration of the present disclosure, the circuit board 400 is positioned horizontally around the resistor 300, i.e., in all directions, front, back, left, and right. Furthermore, the cut-off unit 600 is positioned on the resistor 300. Therefore, it is possible to more completely block foreign matter, such as moisture, from penetrating toward the resistor 300.

[0102] In particular, as in Figure 11 As shown in , the cut-off unit 600 may also be configured to be partially placed on the body portion 410. In this case, the upper portion of the resistor 300 can be more reliably sealed by the cut-off unit 600.

[0103] In addition, as in Figure 11As shown in FIG, the third extension portion 423 can be configured to bend in a form that surrounds the outer side (rear side) of the resistor 300. That is, the third extension portion 423 can be configured to bend downward in a shape that surrounds the rear side of the resistor 300. In addition, the circuit board 400 can be configured to have a thickness that can block the other outer side (front side) of the resistor 300. In this case, the resistor 300 is more reliably sealed from the outside by the body portion 410 and the third extension portion 423, thereby further improving the water penetration blocking effect on the resistor 300.

[0104] Figure 12 is a perspective view schematically showing the configuration of a current measuring device according to yet another embodiment of the present disclosure, and Figure 13 It is along Figure 12 A cross-sectional view taken along line A6-A6'. Figure 12 and Figure 13 , for convenience of explanation, components such as the cutting unit 600 are not shown. In this embodiment, features different from those of the previous embodiment will be described in detail.

[0105] refer to Figure 12 and Figure 13 , the first extension portion 421 and the second extension portion 422 may be configured to be located at different portions in the vertical direction based on the resistor 300. For example, referring to the drawings, the first extension portion 421 may be placed in contact with the upper surface of the first terminal 100, and the second extension portion 422 may be placed in contact with the lower surface of the second terminal 200.

[0106] According to this configuration of the present disclosure, the coupling force between the circuit board 400 and the resistor assembly including the first terminal 100, the resistor 300 and the second terminal 200 can be further increased. Figure 12 and Figure 13 In the embodiment of FIG. 4 , the upward movement of the resistor assembly can be limited by the first extension 421, and the downward movement can be limited by the second extension 422. That is, both the upward and downward movement of the resistor assembly can be limited by the circuit board 400. In particular, when the resistor 300 is squeezed by the cutting unit 600 to cut the resistor 300, the first extension 421 or the second extension 422 can support the resistor assembly in a direction opposite to the squeezing direction. Therefore, the resistor 300 can be cut more smoothly and quickly by the cutting unit 600. In addition, according to this configuration, the coupling force between the circuit board 400 and the resistor assembly can be improved, thereby further enhancing the mechanical stability of the current measuring device.

[0107] In the current measuring device according to the embodiment of the present disclosure, the circuit board 400 may be configured to be detachably attached to the resistor assembly, in particular, the first terminal 100 and the second terminal 200. This will be referred to Figure 14 Describe in more detail.

[0108] Figure 14 1 is an exploded perspective view schematically showing a partial configuration of a current measuring device according to yet another embodiment of the present disclosure. In this embodiment, features different from those of the previous embodiment will be described in detail.

[0109] refer to Figure 14 In the current measuring device according to the present disclosure, the circuit board 400 can be coupled to the first terminal 100 and the second terminal 200 by a fastening member such as a bolt. More specifically, in the first extension 421 of the circuit board 400, as indicated by H21, the first coupling hole can be formed as a perforation in the vertical direction. In addition, a first perforation can also be formed in the first terminal 100, the first perforation being at a position corresponding to the first coupling hole H21 and having a shape corresponding to the first coupling hole H21. In addition, in the second extension 422 of the circuit board 400, as indicated by H22, the second coupling hole can be formed as a perforation in the vertical direction. In addition, a second perforation can also be formed in the second terminal 200, the second perforation being at a position corresponding to the second coupling hole H22 and having a shape corresponding to the second coupling hole H22.

[0110] In addition, the first bolt B1 can be inserted into the first coupling hole H21 and the first through-hole to fasten the first extension 421 and the first terminal 100 to each other. In addition, the second bolt B2 can be inserted into the second coupling hole H22 and the second through-hole to fasten the second extension 422 and the second terminal 200 to each other. Moreover, if the first bolt B1 and the second bolt B2 are separated from each hole, the circuit board 400 and each terminal can be separated from each other.

[0111] According to this configuration of the present disclosure, the resistor assembly and the circuit board 400 can be easily attached and detached. In particular, according to the present disclosure, when an abnormal situation such as overcurrent occurs, the resistor 300 can be cut off by the cutting unit 600. In addition, if the resistor 300 is cut off in this way, it is necessary to replace the resistor assembly with a new one. According to this embodiment, the resistor assembly can be easily separated from the circuit board 400 and replaced by another new resistor assembly simply by loosening the bolts B1 and B2. Accordingly, the circuit board 400 and the like can be used continuously.

[0112] Moreover, although not shown in the drawings, in the above embodiment, the bolts B1 and B2 can not only fasten the resistor assemblies 100, 200, 300 and the circuit board 400 to each other, but also fasten the cut-off unit 600. For example, fastening holes can also be formed in the cut-off unit 600 at positions corresponding to the first coupling holes H21 and the second coupling holes H22 and having shapes corresponding to the first coupling holes H21 and the second coupling holes H22, and the bolts B1 and B2 can also be inserted into these fastening holes. In this case, by fastening only one bolt, the resistor assemblies 100, 200, 300, the circuit board 400, and the cut-off unit 600 can be connected and fixed at one time.

[0113] In addition, in the above configuration, the circuit board 400 and the terminals 100 and 200 can be electrically connected by bolts B1 and B2. That is, the first bolt B1 can be made of a conductive material and configured to electrically connect the conductor pattern of the first extension 421 to the first terminal 100. In addition, the second bolt B2 can also be made of a conductive material and configured to electrically connect the conductor pattern of the second extension 422 to the second terminal 200. According to this configuration of the present disclosure, the extensions 421 and 422 of the circuit board 400 and the terminals 100 and 200 of the resistor assembly can be electrically and mechanically connected at one time by tightening the bolts.

[0114] In another embodiment, the circuit board 400 and the terminal can be electrically connected via a ring terminal wire, etc. For example, one end of the ring terminal wire can be fastened to the first coupling hole H21 and the first fastening hole via a first bolt B1 to be mechanically and electrically connected to the first terminal 100, and the other end of the ring terminal wire can be mechanically and electrically connected to the body 410 of the circuit board 400 via another bolt, etc. In addition, one end and the other end of another ring terminal wire can be mechanically and electrically connected to the second coupling hole H22 and the second fastening hole, and the body 410 of the circuit board 400, respectively.

[0115] In the current measuring device according to the present disclosure, the cutoff unit 600 may be configured to contain gunpowder. Furthermore, the cutoff unit 600 may be configured to cause the contained gunpowder to explode, thereby cutting off the resistor 300. Furthermore, the cutoff unit 600 may cause the gunpowder to explode based on a control signal from the control unit 500. To this end, the cutoff unit 600 may be electrically connected to the control unit 500 to receive the control signal from the control unit 500. For example, the cutoff unit 600 may be connected to the control unit 500 via an FPCB.

[0116] Figure 151 is a side sectional view schematically showing the configuration of a current measuring device according to yet another embodiment of the present disclosure. In this embodiment, features different from those of the previous embodiment will be described in detail. In particular, Figure 15 , the cutting unit 600 is mainly shown, and the other components are shown in simplified forms.

[0117] refer to Figure 15 In the current measuring device according to the present disclosure, the cut-off unit 600 may include an explosion part 610 , a pressing part 620 , and a cover part 630 .

[0118] Here, the explosion part 610 may be located above or below the resistor 300 and may be configured to apply a cutting force due to the explosion to the resistor 300. More specifically, in Figure 15 In the figure, the explosion part 610 is located above the resistor 300 and may include gunpowder 611, an ignition switch 612, a cylinder 613, and a piston 614. Here, as indicated by F in the figure, the ignition switch 612 can be connected to the control unit 500 via an electrical connection element. Here, the electrical connection element can be an FPCB, but various other types of connection elements can also be used. Then, when a cut-off signal is received from the control unit 500, the ignition switch 612 can ignite a flame, causing the gunpowder 611 contained in the cylinder 613 to explode. In addition, due to the explosion of the gunpowder 611, the pressure inside the cylinder 613 increases, and the piston 614 can move downward quickly and strongly.

[0119] In addition, the pressing portion 620 may be connected to the piston 614. The pressing portion 620 may be configured to directly press the resistor 300 by receiving the force caused by the explosion force of the exploding portion 610. More specifically, if the piston 614 moves downward quickly and strongly, the pressing portion 620 connected to the piston 614 will eventually move downward quickly and strongly, as indicated by the arrow in the figure. In addition, the movement of the pressing portion 620 can apply pressure to the resistor 300 to cut off the resistor 300 itself or disconnect the connection between the resistor 300 and the first terminal 100 and / or between the resistor 300 and the second terminal 200. As a result, current can no longer flow through the resistor assemblies 100, 200, 300.

[0120] In addition, the cut-off unit 600 may include a cover portion 630. The cover portion 630 may be positioned opposite to the pressing portion 620 based on the resistor 300. For example, Figure 15In the configuration of , the pressing portion 620 may be located above the resistor 300, and the cover portion 630 may be located below the resistor 300. In addition, the cover portion 630 may be configured to prevent fragments of the resistor 300 cut off by the pressing force of the pressing portion 620 from being scattered. In particular, there may be an empty space in the cover portion 630, and the cover portion 630 may be configured so that one side of the cover portion 630 where the resistor 300 is located is open and all other sides are closed. For example, as in Figure 15 As shown in the configuration shown, when the resistor 300 is located at the upper side, the cover 630 can be configured so that the upper portion of the cover 630 is open and the lower portion and the side portions are closed. According to this configuration of the present disclosure, when the resistor 300 is separated or damaged by the explosion portion 610 and the pressing portion 620, it is possible to prevent the separated or damaged resistor 300 or its fragments from being scattered outside the cutting unit 600. Accordingly, the configuration of the cutting unit 600 for cutting off the resistor 300 can be prevented from damaging other components of the current measuring device.

[0121] Figure 16 1 is a side sectional view schematically showing a configuration of a current measuring device according to yet another embodiment of the present disclosure. In this embodiment, features different from those of the previous embodiment will be described in detail.

[0122] refer to Figure 16 In the current measuring device according to the present disclosure, the circuit board 400 may include a heat dissipation member 430. Specifically, the heat dissipation member 430 may be primarily attached to a surface of the circuit board 400, such as the upper surface of the body portion 410. The heat dissipation member 430 may include a heat dissipation portion 431 for dissipating heat and a heat absorption portion 432 for absorbing heat. Furthermore, the heat dissipation member 430 may be configured to absorb heat generated from the resistor assembly, particularly the first terminal 100 and the second terminal 200. To this end, the heat absorption portion 432 of the heat dissipation member 430 may be configured to directly or indirectly contact at least one of the first terminal 100, the resistor 300, and the second terminal 200 while maintaining electrical insulation from the first terminal 100, the resistor 300, and the second terminal 200. Furthermore, as indicated by the arrows, the heat absorbed from the resistor assembly by the heat absorption portion 432 in this manner may be discharged to the outside via the heat dissipation portion 431. The heat dissipation member 430 may be implemented using various types of heat dissipation configurations known at the time of filing this application, such as a heat sink.

[0123] In particular, the heat transfer material T may be interposed between the heat dissipation member 430 and at least one of the first terminal 100, the resistor 300, and the second terminal 200. For example, as in Figure 16As shown in FIG, a gel-like heat transfer material T may be interposed between the first terminal 100 and the heat absorbing portion 432 of the heat dissipation member 430. Additionally, although not shown in the drawings, the heat transfer material T may also be interposed between the resistor 300 and / or the second terminal 200 and the heat absorbing portion 432 of the heat dissipation member 430. The heat transfer material T may be made of a material having high thermal conductivity and electrical insulation. The heat transfer material T was widely known at the time of filing this application and will not be described in detail here.

[0124] According to this configuration of the present disclosure, the heat of the resistor assembly, particularly the resistor 300, can be more smoothly discharged to the outside. In the case of the resistor 300, due to the temperature coefficient of resistance (TCR) characteristics, it is necessary to take into account the influence of temperature and compensate when measuring current. However, by smoothly discharging the heat of the resistor 300 to the outside as in this embodiment, the influence of temperature can be reduced, thereby improving the accuracy of resistance measurement and reducing the complexity of the calculation process.

[0125] Meanwhile, in the above embodiment, the heat absorbing portion 432 may be configured to protrude downwardly below the heat dissipating portion 431 and be coupled to contact the inner side of the body portion 410 of the circuit board 400. More specifically, one surface of the heat absorbing portion 432 (the left surface in the drawing) may contact the body portion 410, and the other surface of the heat absorbing portion 432 (the right surface in the drawing) may contact at least one of the first terminal 100, the resistor 300, and the second terminal 200. That is, when Figure 16 When viewed in the y-axis direction, the heat absorbing portion 432 may be fixed in a state between the body portion 410 and the resistor assembly 100, 200, 300. Figure 14 When viewed in the x-axis direction, the heat absorption portion 432 may be located between the first extension portion 421 and the second extension portion 422 .

[0126] According to this configuration of the present disclosure, the heat dissipation member 430 can be more stably fixed to the surface of the body portion 410. That is, in the heat dissipation member 430, the movement of the heat absorption portion 432 in the left-right direction (the x-axis direction in the drawing) can be restricted by the first extension portion 421 and the second extension portion 422, and the movement of the heat absorption portion 432 in the front-back direction (the y-axis direction in the drawing) can be restricted by the body portion 410 and the resistor assembly.

[0127] The current measuring device according to the present disclosure can be applied to a battery pack. Accordingly, the battery pack according to the present disclosure can include the above-mentioned current measuring device. In addition, in addition to the current measuring device, the battery pack according to the present disclosure further includes general components included in a battery pack, such as battery cells, a battery pack housing, a BMS, charging and discharging bus bars, a voltage sensing component, etc.

[0128] In addition, the current measuring device according to the present disclosure can be applied to a vehicle. Accordingly, the vehicle according to the present disclosure can include the above-mentioned current measuring device. In addition, in addition to the current measuring device, the vehicle according to the present disclosure can further include common components included in a vehicle, such as a vehicle body, a motor, a drive shaft, etc.

[0129] At the same time, although terms indicating directions such as "up", "down", "left", "right", "front" and "back" have been used in this specification, it is obvious to those skilled in the art that these terms are merely for convenience of explanation and may be expressed differently depending on the observer's viewing position or the position of the object.

[0130] The present disclosure has been described in detail. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present disclosure, are given by way of illustration only, as various changes and modifications within the scope of the present disclosure will become apparent to those skilled in the art from this detailed description.

[0131] Reference numerals

[0132] 100: First terminal

[0133] 200: Second terminal

[0134] 300: Resistor

[0135] 400: Circuit board

[0136] 401: measuring line, 402: connector

[0137] 410: Main body, 421: First extension, 422: Second extension, 423: Third extension

[0138] 430: Heat dissipation components

[0139] 431: heat dissipation part, 432: heat absorption part

[0140] 500: Control unit

[0141] 600: Cutting unit

[0142] 601: Lower protrusion

[0143] 610: Explosives Division

[0144] 611: Gunpowder, 612: Ignition switch, 613: Cylinder, 614: Piston

[0145] 620: Extrusion Department

[0146] 630: Cover

[0147] 700: Shell

[0148] 701: lower shell, 702: upper shell

[0149] H1: Terminal hole, B1: First bolt, B2: Second bolt, H21: First connection hole, H22: Second connection hole, F: Electrical connection element, T: Heat transfer material

Claims

1. A current measuring device, comprising: a first terminal made of a conductive material; a second terminal made of a conductive material and disposed to be spaced apart from the first terminal by a predetermined distance; a resistor interposed in a separation space between the first terminal and the second terminal and made of a conductive material having a larger specific resistance than the first terminal and the second terminal; a circuit board having an electrical path, the circuit board being located at sides of the first terminal and the second terminal, and the circuit board being electrically connected to the first terminal and the second terminal, respectively; a control unit mounted on the circuit board and configured to measure a current flowing in the resistor by using a voltage value between the first terminal and the second terminal and a resistance value of the resistor; and a cut-off unit located above or below the resistor and configured to cut off the resistor according to a control signal of the control unit, wherein the first terminal and the second terminal are configured in a plate shape and are located on the same plane as the circuit board, and Wherein, the circuit board includes: a main body portion, which is located at the side of the first terminal and the second terminal; a first extension portion, which is formed to extend from the main body portion in a horizontal direction and is configured to be placed on the surface of the first terminal; and a second extension portion, which is configured to be placed on the surface of the second terminal.

2. The current measuring device according to claim 1, in, The cutting unit is configured to be at least partially placed on surfaces of the first extension portion and the second extension portion.

3. The current measuring device according to claim 2, in, The cutoff unit is configured to protrude further outward from the first and second extending portions in a horizontal direction.

4. The current measuring device according to claim 1, in, The circuit board is configured to be detachably attached to the first terminal and the second terminal.

5. The current measuring device according to claim 1, in, The cutoff unit contains gunpowder therein, and is configured to cut off the resistor by exploding the gunpowder.

6. The current measuring device according to claim 5, in, The cutting unit includes: an explosion portion, which is located above or below the resistor and is configured to apply a cutting force caused by an explosion to the resistor; a pressing portion, which is configured to press the resistor by the explosion force of the explosion portion; and a cover portion, which is positioned opposite to the pressing portion based on the resistor and is configured to prevent the resistor cut off by the pressing force of the pressing portion from dispersing.

7. The current measuring device according to claim 1, in, The circuit board includes a heat dissipation member provided on a surface of the circuit board, and a heat transfer material interposed between the heat dissipation member and at least one of the first terminal, the resistor, and the second terminal.

8. A battery pack comprising the current measuring device according to any one of claims 1 to 7.

9. A vehicle comprising the current measuring device according to any one of claims 1 to 7.

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