CN219066527U - Resistors and power supply units for sensing current - Google Patents

Abstract

The present application provides a resistor and a power supply device for detecting current. The resistor for detecting current includes: a middle part and a first end part and a second end part connected on both sides of the middle part, and the middle part and the first end part and the second end part are connected by a conductor material, and the middle part is made of a material different from that of the first end portion and the second end portion, wherein the first end portion and the second end portion include a a connected first end body and a second end body, and a first peninsula and a second peninsula separated from the first end body and the second end body by a slot, respectively, wherein the The first peninsula and the second peninsula are connected to the middle portion only by a seam with the middle portion. The resistor according to the embodiment of the utility model reduces the influence of the contact position on the resistance and improves the test accuracy.

Description

Resistors and power supply units for sensing current

technical field

The utility model relates to an electronic device, more specifically, the utility model relates to a resistor used for detecting current in a power supply device.

Background technique

For power supply units of electric vehicles, measuring the current between batteries is necessary for battery management. A resistor assembly is used for this type of measurement, connected between the two batteries of the power supply unit, the resistor consists of copper plates on both sides and a resistive alloy (such as Cu84Ni4Mn12) in the middle. The intermediate resistance alloy has a relatively small rate of change of resistance with temperature, and therefore, by measuring the voltage drop across the intermediate resistance alloy, the current can be accurately measured with substantially little effect from ambient temperature. In a conventional structure, the voltage drop across the intermediate resistance alloy is usually tested by selecting contact wiring on both sides of the copper plate, but the deviation of the contact position may cause the difference in resistance between the two contacts, affecting the measurement accuracy.

Utility model content

The purpose of this application is to solve or at least alleviate the problems existing in the prior art.

In one aspect, a resistor for detecting current is provided, which includes: a middle part and a first end part and a second end part connected to both sides of the middle part, the middle part and the first end Both the first end and the second end are made of conductive material, and the middle part is made of a material different from that of the first end and the second end, wherein the first end and the second end include A first end body and a second end body connected to the current input end and the current output end, and a first peninsula separated from the first end body and the second end body by a notch, respectively and a second peninsula, wherein the first peninsula and the second peninsula are connected to the middle portion only by a seam with the middle portion.

Optionally, in the embodiment of the resistor for detecting current, the notch surrounds all edges of the first peninsula and/or the second peninsula except the seam.

Optionally, in the embodiment of the resistor for detecting current, the first peninsula part and the second peninsula part are arranged symmetrically.

Optionally, in the embodiment of the resistor for detecting current, the first end body and the second end body are arranged symmetrically.

Optionally, in the embodiment of the resistor for detecting current, the notch is in the shape of a semi-circular arc, a semi-elliptical arc or a semi-rectangular shape.

Optionally, in the embodiment of the resistor for detecting current, the middle part has a cutting notch on at least one side.

Optionally, in the embodiment of the resistor for detecting current, the first peninsula and the second peninsula are connected to a middle region of the middle part.

Optionally, in the embodiment of the resistor for detecting current, the first end and the second end are soldered to the middle part, and the first end, the The second end portion and the middle portion are stamped in a rectangular shape.

Optionally, in the embodiment of the resistor for detecting current, the rate of change of the resistance of the middle part with temperature is lower than that of the first end part and the second end part.

There is also provided a power supply device in which the resistor for detecting current according to various embodiments is arranged in a main flow of the power supply device.

The resistor according to the embodiment of the utility model reduces the influence of the contact position on the resistance and improves the test accuracy.

Description of drawings

The disclosure of the present application will become more comprehensible with reference to the accompanying drawings. Those skilled in the art can easily understand that: these drawings are only for the purpose of illustration, and are not intended to limit the protection scope of the present application. In addition, like numerals are used to designate like parts in the drawings, wherein:

FIG. 1 shows a schematic diagram of a resistor for detecting current according to an embodiment of the present invention; and

2 and 3 show schematic diagrams of resistors for detecting current according to other embodiments of the present invention.

Detailed ways

A resistor for detecting current according to various embodiments of the present invention will be described with reference to FIGS. 1 to 3 . The resistor comprises: a middle part 2 and a first end part 1 and a second end part 3 connected on both sides of the middle part 2, the middle part 2 and the first end part 1 and the second end part 3 are all made of conductive material, The middle part 2 is made of a different material than the first end part 1 and the second end part 3 . 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 middle portion 2 may have a lower resistance change rate with temperature than the first end portion 1 and the second end portion. 3 materials, such as copper alloy materials, such as Cu84Ni4Mn12 or other alloys with similar properties. In the illustrated embodiment, the first end 1 and the second end 3 are respectively connected to opposite sides 21, 22 of the middle part 2, for example the middle part 2 may be rectangular, while the first end 1 and the second end The end portions 3 are connected to opposite sides of the middle portion 2 . The first end part 1 and the second end part 2 comprise a first end part body 11 and a second end part body 31 for connecting with the current input end and the current output end, the first end part body 11 and the second end part body 31 is, for example, connected to two batteries or battery packs of the electric vehicle's power supply, and its connection contacts can be arranged at any position of the first end body 11 and the second end body 31 . The first end 1 and the second end 3 further comprise a first peninsula 12 and a second peninsula 32 separated from the first end body 11 and the second end body 31 respectively by notches 13, 33, Wherein, the first peninsula part 12 and the second peninsula part 32 are only connected to the middle part 2 by the seams 121, 321 with the middle part. More specifically, as shown in FIG. 1 , the first peninsula 12 and the second peninsula 32 are connected to the middle part 4 through seams 121, 321, while the first peninsula 12 and the second peninsula 32 are connected to the first end The main body 11 and the second end main body 31 are spaced apart by notches 13, 33 and have no connection relationship. The two test contacts are respectively arranged on the first peninsula part 12 and the second peninsula part 32. Since the middle part 2 is made of a material whose resistance changes less with temperature, the resistance between the two test contacts is basically stable, so it can be The current is tested by testing the voltage drop between these two test points. , 33 apart, so that the influence of the current on the main path on the test contacts is reduced, the sensitivity to the location of the test point is reduced, and the accuracy of the current test is improved. It should be understood that the two test contacts arranged on the first peninsula part 12 and the second peninsula part 32 can be set according to actual conditions, for example, when the first end part 1 and the second end part 3 have the same When the resistance changes with temperature, for example, when the resistance increases with temperature, or when the resistance decreases with temperature, the two contacts should be as close as possible to the joints 121, 321, and when the first end 1 and the second end When the two end portions 3 and the middle portion 2 have opposite resistance variation trends with temperature, for example, the resistance of the first end portion 1 and the second end portion 3 increases with temperature, and when the resistance of the middle portion 2 decreases with temperature, the two The contacts can be set at an appropriate distance from the seams 121, 321, whereby a small portion of the first end portion 1 and the second end portion 3 are added to the test section to offset the effect of the middle portion 2, thereby achieving For a more accurate current measurement, for example the distance can be less than 1/5 of the width of the middle part 2 .

In the embodiment of FIG. 1 , the notches 13 , 33 surround all edges of the first peninsula 12 and/or the second peninsula 32 , respectively, except their seams 121 , 321 with the middle part 2 . In an alternative embodiment, as shown in FIG. 2 , the first peninsula 12 and/or the second peninsula 32 themselves may be at the edge of the first end body 11 and the second end body 31 , and the notch 13 , 33 only partially surrounds the edges of the first peninsula 12 and/or the second peninsula 32 except their seams 121 , 321 with the middle part 2 . In the embodiment of Fig. 1, the notches 13, 33 are semi-rectangular notches with rounded corners. fit the shape. In the illustrated embodiment, the first peninsula 12 and the second peninsula 32 are arranged symmetrically, the first end body 11 and the second end body 31 are arranged symmetrically, in an alternative embodiment, the first peninsula 12 and the second peninsula 32 and the first end body 11 and the second end body 31 may not be symmetrically arranged. In some embodiments, the first peninsula 12 and the second peninsula 32 are connected to the middle region of the middle part 2, that is, the joints 121, 321 between the first peninsula 12 and the second peninsula 32 and the middle part 2 include the middle The midpoint of the opposite sides 21, 22 of the part 2, in an alternative embodiment, as shown in Figure 3, the first peninsula 12 and the second peninsula 32 are connected to one side of the middle part 2, the first peninsula 12 and the seam 121 , 321 of the second peninsula 32 and the middle part 2 is located on the side of the midpoint of the opposite sides 21 , 22 of the middle part 2 .

In some embodiments, the first end 1 and the second end 3 are connected to the middle part 2 by welding, the first end, the second end and the middle part are stamped as a whole to form a rectangle, and the notches 13, 33 are formed by stamping . For example, in one exemplary manufacturing method, a long sheet of material used as the raw material for the first end portion 1 and the second end portion 3 is integrally welded to a long sheet of material used as the middle portion 2, and a plurality of rectangular resistors are produced by stamping. blank, and produce the notches 13, 33 by punching, and finally, as shown in Fig. 2 and Fig. 3, punch out the cutting notch 4 based on the test resistance, thereby adjusting the test resistance of the finished product. Thus, in some embodiments, the middle part 2 has a cut-out 4 at at least one side.

The specific embodiments described above in the present application are only to describe the principle of the present application more clearly, and each component is clearly shown or described so as to make the principle of the present utility model easier to understand. Those skilled in the art can easily make various modifications or changes to the present application without departing from the scope of the present application. Therefore, it should be understood that all these modifications or changes shall be included within the scope of patent protection of the present application.

Claims (10)

1. A resistor for detecting current, comprising: -a middle part (2) and first and second end parts (1, 3) connected on both sides of the middle part, the middle part (2) and the first and second end parts (1, 3) being made of a conductive material, the middle part (2) being made of a material different from the first and second end parts (1, 3), characterized in that the first and second end parts (1, 3) comprise a first and second end part body (11, 31) for connection to a current input and a current output, and a first and a second peninsula (12, 32) separated from the first and second end part body (11, 31) by means of notches (13, 33), respectively, wherein the first and second peninsula (12, 32) are connected to the middle part (2) only by means of seams (121, 321) with the middle part.

2. The resistor for detecting electric current according to claim 1, characterized in that the notch (13, 33) surrounds all edges of the first and/or second peninsula except the seam (121, 321).

3. The resistor for detecting a current according to claim 1, characterized in that the first peninsula (12) and the second peninsula (32) are symmetrically arranged.

4. A resistor for detecting a current according to claim 1, characterized in that the first end body (11) and the second end body (31) are symmetrically arranged.

5. A resistor for detecting a current according to claim 1, characterized in that the notch (13, 33) is semi-circular, semi-elliptical or semi-rectangular.

6. A resistor for detecting electric current according to any of claims 1-5, characterized in that the intermediate part (2) has a cut-out (4) at least one side.

7. A resistor for detecting a current according to any of claims 1-5, characterized in that the first peninsula (12) and the second peninsula (32) are connected to a middle region of the middle section (2).

8. A resistor for detecting electric current according to any of claims 1-5, characterized in that the first end portion (1) and the second end portion (3) are welded to the intermediate portion (2), the first end portion, the second end portion and the intermediate portion being rectangular overall.

9. A resistor for detecting a current according to any of claims 1-5, characterized in that the rate of change of the resistance of the intermediate portion (2) with temperature is lower than the first and second end portions.

10. A power supply device characterized in that a resistor for detecting a current as claimed in any one of claims 1-9 is provided in a main flow path of the power supply device.

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