Resistor for detecting current and power supply device
The resistor design addresses interconnect and accuracy issues by using materials with varying resistance coefficients and structured extensions, enhancing current measurement precision in power devices.
Patent Information
- Application Number
- JP2025100210
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-06-17
- Filing Date
- 2025-06-16
- Publication Date
- 2026-01-05
AI Technical Summary
Existing resistors for current measurement in power devices face challenges in ensuring interconnect performance and maintaining accuracy, particularly due to the influence of ambient temperature and contact position sensitivity.
A resistor design with a middle portion and ends made of different materials, featuring extensions and test ends connected only through the middle portion, reduces sensitivity to contact position and enhances accuracy by using materials with varying temperature coefficients of resistance.
The resistor design improves current measurement accuracy by minimizing the effect of contact position and temperature variations, ensuring reliable connections and precise current detection.
Smart Images
Figure 2026000464000001_ABST
Abstract
Description
[Technical Field]
[0001] This application relates to electronic devices, and more particularly to resistors for sensing current in power supplies. [Background technology]
[0002] In the case of power devices for electric vehicles, measuring the current between batteries is necessary for battery management. A resistance device for making such measurements is connected between two batteries of the power supply device, and the resistor includes copper plates on both sides and a resistance alloy (such as Cu84Ni4Mn12) in the middle. Medium-resistivity alloys have a low temperature coefficient of resistance, so by measuring the voltage drop across the medium-resistivity alloy, the current can be accurately determined with minimal influence from ambient temperature. In some cases, it is difficult to guarantee the interconnect performance of medium-resistivity metals. Summary of the Invention [Problem to be solved by the invention]
[0003] The present application aims to solve or at least alleviate the problems present in the prior art. [Means for solving the problem]
[0004] In one aspect, a resistor for detecting a current comprises a middle portion and a first end and a second end connected to the middle portion, the middle portion, the first end, and the second end being made of a conductive material, and the middle portion being made of a material different from the first end and the second end; the intermediate section comprises an intermediate section body having opposing first and second sides, a first end portion and a second end portion connected to the first and second sides of the intermediate section body, respectively, and a first extension portion and a second extension portion extending from the intermediate section body; A resistor for detecting current is provided having a first test end connected to the first extension and a second test end connected to the second extension.
[0005] Optionally, in an embodiment of the resistor for detecting current, the first end has a first port that functions as a current input end and the second end has a second port that functions as a current output end, and when powered, current flows through the intermediate portion from the first port to the second port.
[0006] Optionally, in an embodiment of a resistor for detecting current, the intermediate body is rectangular and includes a first edge and a second edge between a first side and a second side, and the first extension and the second extension collectively extend from the first edge or the second edge of the intermediate body.
[0007] Optionally, in an embodiment of a resistor for detecting current, the first extension and the second extension extend transversely to the first edge or the second edge.
[0008] Optionally, in an embodiment of a resistor for detecting current, the first test end and the second test end are connected to opposite sides of the first extension and the second extension, respectively, and a test device is connected between the first test end and the second test end, and the first test end and the second test end are connected only to the first end or the second end through an intermediate portion.
[0009] Optionally, in an embodiment of a resistor for detecting current, a seam of the first end and intermediate body is collinear with a seam of the first test end and first extension, and a seam of the second end and intermediate body is collinear with a seam of the second test end and second extension.
[0010] Optionally, in an embodiment of a resistor for detecting current, the first extension and the second extension are spaced apart from one side of the opposing first extension and second extension, and the first extension and the second extension have a chamfered U-shaped configuration at a connection point with the intermediate body.
[0011] Optionally, in an embodiment of a resistor for detecting current, the first end, the first testing end, the second end, and the second testing end are made of a first material, the middle portion is made of a second material, the second material having a temperature coefficient of resistance less than the temperature coefficient of resistance of the first material, the first material being copper, and the second material being a copper alloy material.
[0012] Optionally, in an embodiment of a resistor for detecting current, the resistor is manufactured from a punch of a sheet blank, the sheet blank including a second region, and a pair of parallel seams welded to the first region and the third region on either side of the second region.
[0013] There is further provided a power supply device in which a resistor for sensing current as described by various embodiments is installed in the main path of the power supply device.
[0014] Resistors according to embodiments of the present application reduce the effect of test contact position on resistance, improving test accuracy and ensuring connection between the resistor and voltage test equipment.
[0015] The contents disclosed in the present application can be more easily understood with reference to the drawings. Those skilled in the art will easily understand that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present application. Additionally, like numerals in the drawings are used to represent similar components. [Brief explanation of the drawings]
[0016] [Figure 1] FIG. 1 shows a schematic diagram of a resistor for detecting current according to an embodiment of the present application. [Figure 2] 2 shows a schematic diagram of the resistor connections of FIG. 1; [Figure 3] FIG. 2 shows a schematic diagram of a blank used to make the resistor of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION
[0017] 1 and 2, a resistor for detecting current is described according to an embodiment of the present application. The resistor used for detecting current includes an intermediate portion 2, and a first end 1 and a second end 3 connected to the intermediate portion 2, where the intermediate portion 2, the first end 1, and the second end 3 are all made of a conductive material, and the intermediate portion 2 is made of a different material from the first end 1 and the second end 3.
[0018] In some embodiments, the first end 1 and the second end 3 may be made of the same material, such as copper, and the middle portion 2 may be made of a material having a lower temperature coefficient of resistance than the first end 1 and the second end 3, such as a copper alloy material, for example Cu84Ni4Mn12 or other alloys with similar properties, or any other suitable material.
[0019] Intermediate section 2 includes intermediate section body 20, which includes opposing first and second sides 201 and 202, with first end 1 and second end 3 connected to first and second sides 201 and 202, respectively, of intermediate section body 20. Intermediate section 2 also includes first and second extensions 21 and 22 extending from intermediate section body 20, with first testing end 13 connected to first extension 21 and second testing end 33 connected to second extension 22.
[0020] As shown in FIG. 2 , the test device 4 is connected as a voltmeter between a first test end 13 and a second test end 33. The first end 1 has a first port 11 used as a current input terminal, and the second end 3 has a second port 31 used as a current output terminal. When powered, current flows from the first port 11 through the intermediate section 2 to the second port 31. The first port 11 and the second port 31 may be connected to, for example, two batteries or a battery pack of an electric vehicle power source, respectively. The first test end 13 and the second test end 33 are electrically connected only to the first end 1 or the second end 3 through the intermediate section 2, and are not directly connected to the first end 1 or the second end 3.
[0021] The resistor according to the embodiment of the present application tests for current by connecting the first extension 21 and the second extension 22 to the first test end 13 and the second test end 33, respectively, and when the current i does not pass through the first extension 21 and the second extension 22, the sensitivity to the position of the contact point is reduced, thereby creating a resistance and measuring the current more accurately. Meanwhile, the first test end 13 and the second test end 33 can be more easily connected to the test device 4 than the first extension 21 and the second extension 22.
[0022] In some embodiments, the intermediate body 20 may be rectangular and include a first edge 203 and a second edge 204 between a first side 201 and a second side 202, and the first extension 21 and the second extension 22 collectively extend from the first edge 203 of the intermediate body 20. Alternatively, the first extension 21 and the second extension 22 collectively extend from the second edge 204 of the intermediate body 20.
[0023] In some embodiments, the first extension 21 and the second extension 22 extend transversely to the first edge 203 or the second edge 204. In some embodiments, the first extension 21 and the second extension 22 extend transversely to the current direction i.
[0024] In some embodiments, the first testing end 13 and the second testing end 33 are connected to opposing sides of the first extension 21 and the second extension 22, respectively. In some embodiments, the first extension 21 and the second extension 22 are spaced apart from one side of each other that faces each other. In some embodiments, the connection points between the first extension 21 and the second extension 22 and the intermediate body 20 are rounded. In some embodiments, the connection points between the first extension 21 and the second extension 22 and the intermediate body 20 include a U-shaped access configuration or neck.
[0025] Continuing with reference to FIG. 3, a blank for making a resistor is shown. The resistor can be manufactured from a sheet blank that includes a second region 200, with a pair of parallel seams welded to the first region 100 and the third region 300 on either side of the second region 200. The first region 100 and the third region 300 can use the same material, such as a sheet of a first material, and the second region 200 can be a sheet of a second material. Blowing along the imaginary lines in FIG. 3 and removing waste material 51, 52, and 53 allows for the resistor shape shown in FIGS. 1 and 2 to be obtained, which is convenient to manufacture and produces little waste.
[0026] In some embodiments, first end 1, first testing end 13, second end 3, and second testing end 33 are made of a first material, intermediate section 2 includes intermediate section body 20, and first extension 21 and second extension 22 are made of a second material. The second material has a lower temperature coefficient of resistance than the first material. The first material may be copper, a copper alloy material such as Cu84Ni4Mn12 or other alloys with similar properties, or any other suitable material. Alternatively, portions of first end 1, first testing end 13, second end 3, and second testing end 33 may be selected from different conductive materials.
[0027] In some embodiments, the seam of the first end 1 and intermediate body 20 is collinear with the seam of the first test end 13 and first extension 21, and the seam of the second end 3 and intermediate body 20 is collinear with the seam of the second test end 33 and second extension 22. The above structure can be easily achieved by stamping the blank shown in FIG.
[0028] There is further provided a power supply device in which a resistor for sensing current as described by various embodiments is installed in the main path of the power supply device.
[0029] The specific embodiments described above in this application are intended only to more clearly describe the principles of this application, i.e., to clearly illustrate or describe various components to facilitate understanding of the principles of the present disclosure. Within the scope of this application, those skilled in the art can easily make various modifications or changes to this application. Therefore, it should be understood that these modifications or changes are all included within the scope of patent protection of this application.
Claims
1. A resistor for detecting a current, comprising: an intermediate portion (2); and a first end (1) and a second end (3) connected to the intermediate portion (2), respectively, wherein the intermediate portion (2), the first end (1) and the second end (3) are made of a conductive material, and the intermediate portion (2) is made of a material different from the first end (1) and the second end (3); The intermediate section (2) comprises an intermediate section body (20), the intermediate section body (20) including a first side surface (201) and a second side surface (202) opposite to each other, the first end portion (1) and the second end portion (3) being connected to the first side surface (201) and the second side surface (202) of the intermediate section body (20), respectively, and a first extension portion (21) and a second extension portion (22) extending from the intermediate section body (20); A first test end (13) is connected to the first extension (21) and a second test end (33) is connected to the second extension (22). A resistor for detecting current.
2. The first end (1) has a first port (11) used as a current input end, and the second end (3) has a second port (31) used as a current output end, and when powered, a current (1) flows from the first port (11) through the intermediate part (2) to the second port (31).
10. The resistor for detecting a current according to claim 1.
3. The intermediate body (20) is rectangular and includes a first edge (203) and a second edge (204) between the first side (201) and the second side (202), and the first extension (21) and the second extension (22) collectively extend from the first edge (203) or the second edge (204) of the intermediate body (20).
3. A resistor for detecting a current according to claim 2.
4. the first extension (21) and the second extension (22) extend transversely to the first edge (203) or the second edge (204); 4. A resistor for detecting a current according to claim 3.
5. the first test end (13) and the second test end (33) are connected to opposite sides of the first extension (21) and the second extension (22), respectively; a testing device (4) is connected between the first test end (13) and the second test end (33); and the first test end (13) and the second test end (33) are connected only to the first end (1) or the second end (3) through the intermediate portion (2).
4. A resistor for detecting a current according to claim 3.
6. the seam of the first end (1) and the intermediate body (20) is collinear with the seam of the first testing end (13) and the first extension (21); the seam of the second end (3) and the intermediate body (20) is collinear with the seam of the second testing end (33) and the second extension (22); 6. A resistor for detecting a current according to claim 5.
7. The first extension portion (21) and the second extension portion (22) are spaced apart from each other on one side facing the other of the first extension portion (21) and the second extension portion (22), and the first extension portion (21) and the second extension portion (22) have a chamfered U-shaped configuration at a connection position with the intermediate body (20).
5. A resistor for detecting a current according to claim 4.
8. the first end (1), the first test end (13), the second end (3) and the second test end (33) are made of a first material, the intermediate portion (2) is made of a second material, the temperature coefficient of resistance of the second material is lower than the temperature coefficient of resistance of the first material, the first material is copper, and the second material is a copper alloy material; A resistor for detecting a current according to any one of claims 1 to 7.
9. The resistor is manufactured from a punch of a sheet blank, the sheet blank including a second region (200), and a pair of parallel seams welded to the first region (100) and the third region (300) on either side of the second region (200).
9. A resistor for detecting a current according to claim 8.
10. A power supply device, wherein the resistor for detecting current according to any one of claims 1 to 9 is installed in a main current path of the power supply device.