Resistor for detecting current and power supply device

Abstract

The utility model provides a resistor for detecting current and a power supply device. The resistor used for detecting current comprises a middle part and a first end part and a second end part which are respectively connected to the middle part, the middle part comprises a middle part main body, and the middle part main body comprises a first side and a second side which are opposite to each other, the first end part and the second end part are respectively connected to a first side and a second side of the middle part main body and a first extension part and a second extension part which extend out of the middle part main body; wherein a first test end is connected to the first extension and a second test end is connected to the second extension. According to the resistor provided by the embodiment of the invention, the influence of the test contact position on the resistor is reduced, the test precision is improved, and the connection between the resistor and the voltage test device is ensured.

Description

Technical Field

[0001] The present application relates to an electronic device, and more specifically, to a resistor for detecting current in a power supply device. Background Art

[0002] For the power supply device of an electric vehicle, measuring the current between batteries is necessary for battery management. A resistor device is used for such measurement, which is connected between two batteries of the power supply device. The resistor includes copper plates on both sides and a resistance alloy (such as Cu84Ni4Mn12) in the middle. The resistance change rate of the middle resistance alloy with temperature is small. Therefore, by measuring the voltage drop across the middle resistance alloy, the current can be accurately measured with little influence from the ambient temperature. In some cases, it is difficult to ensure the connection performance of the middle resistance alloy. Summary of the Utility Model

[0003] The purpose of the present application is to solve or at least alleviate the problems existing in the prior art.

[0004] On the one hand, a resistor for detecting current is provided, which includes: a middle part, and a first end part and a second end part respectively connected to the middle part. The middle part, the first end part and the second end part are all made of conductor materials, and the middle part is made of a material different from that of the first end part and the second end part;

[0005] Wherein, the middle part includes: a middle part main body, the middle part main body includes opposite first and second sides, the first end part and the second end part are respectively connected to the first side and the second side of the middle part main body and first and second extension parts extending from the middle part main body; wherein, a first test end part is connected to the first extension part and a second test end part is connected to the second extension part.

[0006] Optionally, in an embodiment of the resistor for detecting current, the first end part has a first port serving as a current input end, the second end part has a second port serving as a current output end. When powered on, the current flows from the first port through the middle part to the second port.

[0007] Optionally, in an embodiment of the resistor for detecting current, the middle part main body is rectangular and includes a first side and a second side between the first side and the second side, and the first extension part and the second extension part commonly extend from the first side or the second side of the middle part main body.

[0008] Optionally, in the embodiment of the resistor for detecting current, the first extension portion and the second extension portion extend out in a direction transverse to the first side or the second side.

[0009] Optionally, in the embodiment of the resistor for detecting current, the first test end portion and the second test end portion are respectively connected to the sides of the first extension portion and the second extension portion facing away from each other, a test device is connected between the first test end portion and the second test end portion, and the first test end portion and the second test end portion are connected to the first end portion or the second end portion only through the middle portion.

[0010] Optionally, in the embodiment of the resistor for detecting current, the seam between the first end portion and the main body of the middle portion is collinear with the seam between the first test end portion and the first extension portion, and the seam between the second end portion and the main body of the middle portion is collinear with the seam between the second test end portion and the second extension portion.

[0011] Optionally, in the embodiment of the resistor for detecting current, the sides of the first extension portion and the second extension portion facing each other are spaced apart, and the connection positions of the first extension portion and the second extension portion with the main body of the middle portion have a chamfered and closed structure.

[0012] Optionally, in the embodiment of the resistor for detecting current, the first end portion, the first test end portion, the second end portion, and the second test end portion are made of a first material, the middle portion is made of a second material, and the rate of change of the resistance of the second material with temperature is lower than the rate of change of the resistance of the first material with temperature, wherein the first material is copper and the second material is a copper alloy material.

[0013] Optionally, in the embodiment of the resistor for detecting current, the resistor is made by blanking a sheet blank, and the sheet blank includes: a second region and a first region and a third region welded to both sides of the second region along a pair of parallel weld seams.

[0014] A power supply device is further provided, and the resistor for detecting current according to each embodiment is provided in the main flow path of the power supply device.

[0015] The resistor according to the embodiment of the present application reduces the influence of the test contact position on the resistance, improves the test accuracy, and at the same time ensures the connection between the resistor and the voltage test device. Description of the Drawings

[0016] Referring to the accompanying drawings, the disclosure of the present application will become more readily understandable. It is readily understood by those skilled in the art that these drawings are merely for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numerals in the figures are used to represent similar components, wherein:

[0017] Figure 1 Shows a schematic diagram of a resistor for detecting current according to an embodiment of the present application;

[0018] Figure 2 Shows Figure 1 a schematic diagram when the resistors are connected; and

[0019] Figure 3 Shows a schematic diagram of a blank for manufacturing Figure 1 the resistor. Detailed Embodiments

[0020] Referring to Figure 1 and Figure 2 to introduce a resistor for detecting current according to an embodiment of the present application. The resistor for detecting current includes: an intermediate portion 2 and a first end portion 1 and a second end portion 3 respectively connected to the intermediate portion 2. The intermediate portion 2, the first end portion 1, and the second end portion 3 are all made of a conductor material, and the intermediate portion 2 is made of a material different from that of the first end portion 1 and the second end portion 3.

[0021] In some embodiments, the first end portion 1 and the second end portion 3 may be made of the same material, such as copper, and the intermediate portion 2 may be made of a material with a lower rate of change of resistance with temperature than the first end portion 1 and the second end portion 3, such as a copper alloy material, such as Cu84Ni4Mn12 or other alloys with similar properties, or a suitable material.

[0022] The intermediate portion 2 includes: an intermediate portion main body 20. The intermediate portion main body 20 includes opposite first side 201 and second side 202. The first end portion 1 and the second end portion 3 are respectively connected to the first side 201 and the second side 202 of the intermediate portion main body 20. The intermediate portion 2 further includes a first extension portion 21 and a second extension portion 22 extending from the intermediate portion main body 20. Among them, the first test end portion 13 is connected to the first extension portion 21 and the second test end portion 33 is connected to the second extension portion 22.

[0023] As Figure 2As shown, the test device 4 is connected between the first test end 13 and the second test end 33 like a voltmeter. The first end 1 has a first port 11 serving as a current input end; the second end 3 has a second port 31 serving as a current output end. When powered on, the current flows from the first port 11 through the middle part 2 to the second port 31. The first port 11 and the second port 31 can be connected to two batteries or battery packs of the power supply of an electric vehicle, for example. The first test end 13 and the second test end 33 are electrically connected to the first end 1 or the second end 3 only through the middle part 2, and the first test end 13 and the second test end 33 are not directly connected to the first end 1 or the second end 3.

[0024] The resistor according to the embodiment of the present application tests the current through the first test end 13 and the second test end 33 respectively connected to the first extension 21 and the second extension 22. Since 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 enabling the resistor to measure the current more accurately. On the other hand, the first test end 13 and the second test end 33 can be more easily connected to the test device 4 compared with the first extension 21 and the second extension 22.

[0025] In some embodiments, the middle part body 20 can be rectangular and include a first side 203 and a second side 204 between the first side 201 and the second side 202. The first extension 21 and the second extension 22 extend out from the first side 203 of the middle part body 20 together. Alternatively, the first extension 21 and the second extension 22 extend out from the second side 204 of the middle part body 20 together.

[0026] In some embodiments, the first extension 21 and the second extension 22 extend out in a direction transverse to the first side 203 or the second side 204. In some embodiments, the first extension 21 and the second extension 22 extend out in a direction transverse to the current direction i.

[0027] In some embodiments, the first test end 13 and the second test end 33 are respectively connected to the sides of the first extension 21 and the second extension 22 facing away from each other. In some embodiments, the sides of the first extension 21 and the second extension 22 facing each other are spaced apart. In some embodiments, the connection positions of the first extension 21 and the second extension 22 with the middle part body 20 are rounded. In some embodiments, the connection positions of the first extension 21 and the second extension 22 with the middle part body 20 include a necking structure or a neck.

[0028] Continue to refer to Figure 3, which shows a blank for manufacturing a resistor. The resistor can be blanked from a sheet blank, and the sheet blank includes: a second region 200 and a first region 100 and a third region 300 welded to both sides of the second region 200 along a pair of parallel weld seams. The first region 100 and the third region 300 can be made of the same material, such as a sheet of a first material, and the second region 200 can be a sheet of a second material. Blanking is performed along Figure 3 the dashed line in Figure 1 and removing the waste materials 51, 52, 53 can obtain the prototype of the resistor as shown in Figure 2 , which is convenient to manufacture and has less waste.

[0029] In some embodiments, 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, and the middle part 2 includes a middle part main body 20, a first extension part 21, and a second extension part 22 made of a second material. The rate of change of the resistance of the second material with temperature is lower than the rate of change of the resistance of the first material with temperature. The first material can be copper, and the second material can be, for example, a copper alloy material, such as Cu84Ni4Mn12 or other alloys with similar properties, or a suitable material. Alternatively, some of the first end 1, the first test end 13, the second end 3, and the second test end 33 can be selected from different conductor materials.

[0030] In some embodiments, the seam between the first end 1 and the middle part main body 20 is collinear with the seam between the first test end 13 and the first extension part 21, and the seam between the second end 3 and the middle part main body 20 is collinear with the seam between the second test end 33 and the second extension part 22. The above structure can be easily achieved by blanking the blank in Figure 3 .

[0031] A power supply device is also provided, and a resistor for detecting current according to each embodiment is provided in the main flow path of the power supply device.

[0032] The specific embodiments described above in this application are only for more clearly describing the principle of this application, in which each component is clearly shown or described to make the principle of this application easier to understand. Without departing from 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 should be included within the scope of the patent protection of this application.

Claims

1. A resistor for detecting current, comprising: A middle part (2) and a first end (1) and a second end (3) respectively connected to the middle part (2), wherein the middle part (2), the first end (1) and the second end (3) are all made of a conductive material, and the middle part (2) is made of a material different from that of the first end (1) and the second end (3); The middle part (2) comprises: a middle part body (20), the middle part body (20) comprising a first side (201) and a second side (202) opposite to each other, the first end (1) and the second end (3) being respectively connected to the first side (201) and the second side (202) of the middle part body (20) and a first extension part (21) and a second extension part (22) extending from the middle part body (20); The first test end (13) is connected to the first extension portion (21) and the second test end (33) is connected to the second extension portion (22).

2. The resistor according to claim 1, characterized in that 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 power is turned on, current (i) flows from the first port (11) through the middle part (2) to the second port (31).

3. The resistor for detecting current according to claim 2, characterized in that: The middle part body (20) is rectangular and comprises a first side (203) and a second side (204) between the first side (201) and the second side (202); the first extension portion (21) and the second extension portion (22) extend together from the first side (203) or the second side (204) of the middle part body (20).

4. The resistor for detecting current according to claim 3, characterized in that: The first extension portion (21) and the second extension portion (22) extend in a direction transverse to the first side (203) or the second side (204).

5. The resistor for detecting current according to claim 3, characterized in that: The first test end (13) and the second test end (33) are respectively connected to the first extension part (21) and the second extension part (22) on the side facing away from each other, the test 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 to the first end (1) or the second end (3) only through the middle part (2).

6. The resistor for detecting current according to claim 5, characterized in that: The seam between the first end (1) and the middle part body (20) is colinear with the seam between the first test end (13) and the first extension part (21), and the seam between the second end (3) and the middle part body (20) is colinear with the seam between the second test end (33) and the second extension part (22).

7. The resistor for detecting current according to claim 4, characterized in that: The first extension part (21) and the second extension part (22) are spaced apart on one side facing each other, and the connection positions of the first extension part (21) and the second extension part (22), the first extension part (21) and the second extension part (22) and the middle part body (20) have a chamfered closing structure.

8. The resistor for detecting current according to any one of claims 1 to 7, characterized in that: 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, and the middle part (2) is made of a second material, wherein the rate of change of the resistance of the second material with temperature is lower than the rate of change of the resistance of the first material with temperature, wherein the first material is copper and the second material is a copper alloy material.

9. The resistor according to claim 8, characterized in that The resistor is punched out of a sheet blank, the sheet blank comprising: a second region (200) and a first region (100) and a third region (300) welded to both sides of the second region (200) along a pair of parallel welds.

10. A power supply device, characterized in that: A resistor for detecting current according to any one of claims 1 to 9 is provided in the main flow path of the power supply device.

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