Resistor with low temperature coefficient of resistance

Abstract

The invention provides a resistor with a low resistance temperature coefficient. The resistor comprises a resistor piece and a resistor, the first conductive piece is connected to the first side of the resistance piece; the second conductive piece is connected to the second side of the resistance piece; the first extension part is connected to the first side of the resistor piece, extends in the direction away from the resistor piece, and is arranged at an interval with the first conductive piece; the second extension part is connected to the second side of the resistor piece, extends in the direction away from the resistor piece, and is arranged at an interval with the second conductive piece; the first detection point is arranged on the first extension part; and the second detection point is arranged on the second extension part.

Description

Technical Field

[0001] The present invention relates to a resistor, and more particularly to a resistor having a relatively low resistance temperature coefficient. Background Art

[0002] When current sampling is performed using an existing vehicle shunt or resistor, due to the increase in operating temperature caused by energization, the sampled resistance value will increase due to the temperature drift effect of the copper terminals, resulting in an increase in the error of current measurement. The resistor element of the resistor is usually formed by a resistance strip disposed between two conductive strips. The conductive strips are usually formed of copper sheet material. The thickness of the copper sheet is usually selected based on the desired element power consumption and the desired mechanical strength. The conductive strips are formed of copper. Copper has a resistance temperature coefficient (TCR) of 3900 ppm / °C. In contrast, the resistor element may have a TCR of less than 100 ppm / °C. Since a large amount of copper is disposed in the current path of the resistor, the resistor has a very high positive TCR.

[0003] U.S. Patent No. US8198977B2 discloses a resistor having a resistance temperature coefficient (TCR) compensation. The aforementioned patent discloses a resistor formed by a resistance strip disposed between two conductive strips. Two main terminals and two extension portions are formed on these conductive strips of the resistor, wherein the extension end portions extend from the conductive strips and the voltage detection end points are disposed at their ends. During operation, the two main terminals carry most of the current flowing through the resistor. Since the extension end portions extend from the conductive strips, although a first notch is provided therebetween. However, the extension end portions and the main terminals are still electrically connected via the conductive strips (the edges of the first notch). Such a structure will cause the position of the voltage detection end point to easily affect the error amount of voltage detection. That is to say, whether it is the position offset amount of the voltage detection end point generated during welding or manufacturing, it is easy to cause the error amount of voltage detection to change correspondingly. In addition, there is still room for improvement in the resistance temperature coefficient (TCR, Temperature Coefficient of Resistance) of the aforementioned structure. Summary of the Invention

[0004] The object of the present invention is to provide a resistor with a lower resistance temperature coefficient compared to the prior art and reduce the error amount of voltage detection affected by the position of the voltage detection terminal. To achieve the above object, an embodiment of the present invention provides a resistor, comprising: a resistor element; a first conductive member connected to a first side of the resistor element; a second conductive member connected to a second side of the resistor element; a first extension portion connected to the first side of the resistor element, extending away from the resistor element, and spaced apart from the first conductive member; a second extension portion connected to the second side of the resistor element, extending away from the resistor element, and spaced apart from the second conductive member; a first detection point provided on the first extension portion; and a second detection point provided on the second extension portion.

[0005] In one embodiment, the first conductive member and the first extension portion are welded to the first side of the resistor element, and the second conductive member and the second extension portion are welded to the second side of the resistor element. The welding structure on the resistor element between the first conductive member and the first extension portion is partially or completely removed. The welding structure on the resistor element between the second conductive member and the second extension portion is partially or completely removed.

[0006] In one embodiment, a first welding structure is formed between the resistor element and the first conductive member, a third welding structure is formed between the resistor element and the first extension portion, and a first intermediate welding structure is connected between the first welding structure and the third welding structure. A second welding structure is formed between the resistor element and the second conductive member, a fourth welding structure is formed between the resistor element and the second extension portion, and a second intermediate welding structure is connected between the second welding structure and the fourth welding structure. The first intermediate welding structure or / and the second intermediate welding structure includes at least one groove, and the at least one groove faces away from the resistor element.

[0007] In one embodiment, a first welding structure is formed between the resistor element and the first conductive member, a third welding structure is formed between the resistor element and the first extension portion, and the first welding structure and the third welding structure are spaced apart. A second welding structure is formed between the resistor element and the second conductive member, a fourth welding structure is formed between the resistor element and the second extension portion, and the second welding structure and the fourth welding structure are spaced apart. The two side edges of the resistor element respectively have a first notch or / and a second notch.

[0008] In one embodiment, a first gap is formed between the first extension portion and the first conductive member, and a second gap is formed between the second extension portion and the second conductive member. In one embodiment, the first notch and the second notch respectively correspond to the first gap and the second gap. In one embodiment, preferably, the widths of the first gap and the second gap can be respectively in the range of 1.0 - 3.5 mm.

[0009] In one embodiment, the resistor has a groove formed at a first edge of the resistor. In one embodiment, the first conductive member is formed with a first locking hole, and the second conductive member is formed with a second locking hole.

[0010] In one embodiment, the first extension portion and the second extension portion are bent respectively in a direction normal to the surface of the first conductive member or the second conductive member.

[0011] In one embodiment, the first detection point and the second detection point are pins. In one embodiment, the resistor further includes a conductive frame and an electrically insulating housing, which together form a connector. The conductive frame includes a first conductive lead-out structure and a second conductive lead-out structure. The first end of the first conductive lead-out structure is joined to the first extension portion as the first detection point; the first end of the second conductive lead-out structure is joined to the second extension portion as the second detection point. The electrically insulating housing is disposed on the surface of the middle portion of the resistor and is formed in a hollow shape. The electrically insulating housing defines a receiving space, and the second ends of the first conductive lead-out structure and the second conductive lead-out structure are located in the receiving space of the electrically insulating housing. In one embodiment, the resistor further includes at least one reinforcing structure. One end of the at least one reinforcing structure is fixed to the first conductive member and / or the second conductive member, and the other end of the at least one reinforcing structure is fixedly covered by the electrically insulating housing.

[0012] With the above structure, the resistor of the present invention can effectively reduce the temperature coefficient of resistance and achieve better product characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a perspective view of a resistor according to an embodiment of the present invention.

[0014] Figure 2 FIG. is a top view of a resistor according to an embodiment of the present invention.

[0015] Figure 3A FIG. is a top view of a resistor according to another embodiment.

[0016] Figure 3B FIG. is a top view of a resistor according to another embodiment.

[0017] Figure 4 FIG. is a top view of a resistor according to another embodiment.

[0018] Figure 5 FIG. is a perspective view of a resistor according to another embodiment.

[0019] Figure 6 FIG. is a TCR simulation diagram of a resistor of a comparative example and a resistor according to an embodiment of the present invention.

[0020] Figure 7A FIG. is a perspective view of a resistor according to another embodiment.

[0021] Figure 7B Is a perspective view of a resistor according to another embodiment.

[0022] Reference numerals

[0023] 10: Resistor

[0024] 100: Resistor

[0025] 101: First conductive member

[0026] 102: Second conductive member

[0027] 103: Resistive element

[0028] 104: First extension

[0029] 105: Second extension

[0030] 106: First detection point

[0031] 107: Second detection point

[0032] 108: Third detection point

[0033] 109: Fourth detection point

[0034] 10a: Resistor

[0035] 10b: Resistor

[0036] 111: First locking hole

[0037] 112: Second locking hole

[0038] 121: First welding structure

[0039] 122: Second welding structure

[0040] 124: Third welding structure

[0041] 125: Fourth welding structure

[0042] 131: Groove

[0043] 132: Another groove

[0044] 134: First interval

[0045] 135: Second interval

[0046] 136: First intermediate welding structure

[0047] 137: Second intermediate welding structure

[0048] 138: Notch

[0049] 139: Notch

[0050] 141: First bump

[0051] 142: Second bump

[0052] 161: Groove

[0053] 171: Groove

[0054] 181: Reinforcing structure

[0055] 190: Accommodating space

[0056] 191: Accommodating space

[0057] 192: Power conducting bar or wire

[0058] 193: Power conducting bar or wire

[0059] 200: Conductive frame

[0060] 201: First conductive lead-out structure

[0061] 202: Second conductive lead-out structure

[0062] 210: Electrically insulating housing

[0063] 231: Screw

[0064] 232: Screw

[0065] D1: Main current direction

[0066] H1: Spacing

[0067] H2: Spacing Detailed implementation manner

[0068] In the following, details will be described with reference to the accompanying drawings, the content of which also forms part of the detailed description of the specification and is illustrated in a special description manner that can implement the embodiment. The following embodiments have described sufficient details for those skilled in the art to implement them. Of course, other embodiments can also be adopted, or any structural, logical, and electrical changes can be made without departing from the embodiments described in the text. Therefore, the following detailed description should not be regarded as a limitation. On the contrary, the embodiments included therein will be defined by the appended claims. The drawings illustrating the embodiments of the device are not drawn to scale, and in particular, certain dimensions are exaggerated in the drawings for clear presentation.

[0069] Figure 1 It is a perspective view of a resistor according to an embodiment of the present invention. Figure 2The top view of a resistor according to an embodiment of the present invention. As Figure 1 and Figure 2 shown, a resistor 100 with a low resistance temperature coefficient according to an embodiment of the present invention includes a resistive element 103, a first conductive member 101, a second conductive member 102, a first extension portion 104, and a second extension portion 105. A main current direction D1 is defined on the resistor 100. The first conductive member 101 and the second conductive member 102 may be alloy materials of copper, aluminum, or a combination thereof, and the resistive element 103 may be an alloy material of copper-manganese-tin alloy, copper-manganese-nickel alloy, nickel-chromium-aluminum-silicon alloy, or a combination thereof. The resistive element 103 is located between the first conductive member 101 and the second conductive member 102, and the resistance value or resistivity of the resistive element 103 is more than 10 times that of the first conductive member 101 and the second conductive member 102. As Figure 1 and Figure 2 shown, the resistive element 103 protrudes toward at least one side edge of the first conductive member 101 and the second conductive member 102, and extends toward the first extension portion 104 and the second extension portion 105, thereby connecting the resistive element 103 to the first extension portion 104 and the second extension portion 105. Preferably, a part of the first extension portion 104 and the second extension portion 105 can be used as voltage detection terminals respectively.

[0070] The first conductive member 101 is connected to the first side of the resistive element 103 in the main current direction D1. The first extension portion 104 is connected to the first side of the resistive element 103. The first extension portion 104 is located on one side of the first conductive member 101 and does not contact the first conductive member 101. Preferably, a first gap 134 is formed between the first extension portion 104 and the first conductive member 101. In this embodiment, preferably, the first gap 134 can be strip-shaped and the extending direction of the first gap 134 is parallel to the main current direction D1. The distance between the first extension portion 104 and the first conductive member 101, that is, the width of the first gap 134 is the pitch H1. In other embodiments, the first gap 134 can be strip-shaped and the extending direction of the first gap 134 is not perpendicular to the main current direction D1. Or, the first gap 134 can also be of any shape. And in such an embodiment, the pitch H1 can be the distance between two points where the two side edges of the first gap 134 (defined by the first extension portion 104 and the first conductive member 101) are connected to the resistive element 103.

[0071] The second conductive member 102 is connected to a second side of the resistor member 103 relative to the first side in the main current direction D1. The second extension portion 105 is connected to the second side of the resistor member 103. The second extension portion 105 is located on one side of the second conductive member 102 and does not contact the second conductive member 102. Preferably, a second gap 135 is formed between the second extension portion 105 and the second conductive member 102. In this embodiment, preferably, the second gap 135 may be elongated and the extending direction of the second gap 135 is parallel to the main current direction D1. The distance between the second extension portion 105 and the second conductive member 102, that is, the width of the second gap 135 is the pitch H2. In other embodiments, the second gap 135 may be elongated and the extending direction of the second gap 135 is not perpendicular to the main current direction D1. Alternatively, the second gap 135 may also be of any shape. In such an embodiment, the pitch H2 may be the distance between two points where the two sides of the second gap 135 (defined by the second extension portion 105 and the second conductive member 102) are connected to the resistor member 103.

[0072] In one embodiment, the resistor 100 can fine-tune the TCR performance by adjusting the sizes of the pitch H1 and the pitch H2. When the pitch H1 and the pitch H2 are increased, the TCR gradually tends to be negative. Preferably, when the pitch H1 and the pitch H2 are in the range of 1.0 - 3.5 mm, relatively ideal TCR characteristics can be achieved.

[0073] In one embodiment, the joining between the resistor member 103 and the first conductive member 101, the second conductive member 102, the first extension portion 104, the second extension portion 105, etc. can be a fusion joining performed by a welding process, and a first welding structure 121, a second welding structure 122, a third welding structure 124, and a fourth welding structure 125 are respectively formed. The first welding structure 121 contains materials in which the melted parts of the resistor member 103 and the first conductive member 101 are mixed together. The second welding structure 122 contains materials in which the melted parts of the resistor member 103 and the second conductive member 102 are mixed together. The third welding structure 124 contains materials in which the melted parts of the resistor member 103 and the first extension portion 104 are mixed together. The fourth welding structure 125 contains materials in which the melted parts of the resistor member 103 and the second extension portion 105 are mixed together.

[0074] Figure 2 It is a top view of a resistor according to an embodiment of the present invention. As Figure 2As shown, the manufacturing method of the resistor 100 according to an embodiment of the present invention is as follows. Provide a resistor element 103, a first conductive member 101, a second conductive member 102, a first extension portion 104, and a second extension portion 105. Then, after placing the first conductive member 101, the second conductive member 102, the first extension portion 104, and the second extension portion 105 on two opposite sides of the resistor element 103 respectively, use a bonding process such as a fusion welding process to bond the resistor element 103 between the first conductive member 101 and the second conductive member 102; and bond between the first extension portion 104 and the second extension portion 105. According to this manufacturing method, the bottom surfaces defining the first interval 134 and the second interval 135 are the side edges of the resistor element 103.

[0075] The manufacturing method of the resistor 100 according to an embodiment of the present invention is as follows. Provide two conductive bodies and a resistor element 103. Use a bonding process to bond the resistor element 103 to the conductive bodies, such as fusion bonding, so that the resistor element 103 is bonded between the conductive bodies. Then, remove or cut the conductive bodies to form the first interval 134 and the second interval 135, and correspondingly form the first conductive member 101, the second conductive member 102, the first extension portion 104, and the second extension portion 105. For example, use a punching process, a mechanical cutting process, or a laser cutting process to achieve this. Moreover, the first intermediate welding structure 136 between the first conductive member 101 and the first extension portion 104 is partially or completely removed. The second intermediate welding structure 137 between the second conductive member 102 and the second extension portion 105 is partially or completely removed.

[0076] Figure 3A It is a top view of a resistor according to another embodiment. More specifically, when the aforementioned intermediate welding structure 136 or 137 is partially removed, as Figure 3A shown, the bottom surfaces defining the first interval 134 and the second interval 135 are at least one groove 161, 171 defined by the aforementioned intermediate welding structure 136 or / and the intermediate welding structure 137, and the at least one groove 161, 171 faces away from the resistor element 103. The first intermediate welding structure 136 is connected between the first welding structure 121 and the third welding structure 124, and the second intermediate welding structure 137 is connected between the second welding structure 122 and the fourth welding structure 125. Figure 3B It is a top view of a resistor according to another embodiment. When the aforementioned intermediate welding structure 136 or 137 is completely removed, as Figure 2 or Figure 3B shown, the bottom surfaces defining the first interval 134 and the second interval 135 are the side edges of the resistor element 103. To more surely remove the aforementioned intermediate welding structure 136 or 137, as Figure 3BAs shown, notches 138 or / and 139 are further cut out on the side of the resistor element 103. These notches respectively correspond to the first interval 134 or / and the second interval 135, and are correspondingly oriented away from the resistor element 103. These different welding structure designs can provide different electrical characteristics and mechanical strengths to meet the requirements of different application scenarios.

[0077] The foregoing welding process is not particularly limited as long as it can melt and mix two materials together, and can be one or more of, for example, laser beam welding, electron-beam welding, and high-current welding (spot welding). Moreover, the first welding structure 121 does not directly contact the third welding structure 124. Preferably, the first interval 134 is located between the first welding structure 121 and the third welding structure 124, and completely separates the first welding structure 121 and the third welding structure 124, and further completely separates the first conductive member 101 and the first extension portion 104. The second welding structure 122 does not directly contact the fourth welding structure 125. Preferably, the second interval 135 is located between the second welding structure 122 and the fourth welding structure 125, and completely separates the second welding structure 122 and the fourth welding structure 125, and further completely separates the second conductive member 102 and the second extension portion 105.

[0078] As Figure 1 and Figure 2 shown, the resistor 100 further includes a first detection point 106 provided on the first extension portion 104 and a second detection point 107 provided on the second extension portion 105. When the resistor 100 is connected in series to a battery or a current path of an electrical system, the current to be measured flows into the resistor element 103 from the first conductive member 101 and then flows out from the second conductive member 102, and a corresponding detection voltage is generated between the first extension portion 104 and the second extension portion 105. This detection voltage is equal to the resistance value of the resistor 100 multiplied by the current value of the current to be measured. A current detection unit (not shown) detects the magnitude of the current value of the current to be measured by obtaining this detection voltage. In one embodiment, the first detection point 106 and the second detection point 107 can be pins or solder welding areas.

[0079] In the prior art, the pins serving as detection points are respectively arranged at the middle positions of the first conductive member 101 and the second conductive member 102. That is, the detection points serving as voltage sampling terminals and the first conductive member 101 and the second conductive member 102 serving as the main current paths to be measured are all designed on the same conductor. The TCR of the resistor with such an existing structure is 63.46 ppm / K. In contrast, in an embodiment of the present invention, the first extension portion 104 extends independently from the first conductive member 101, that is, the first extension portion 104 is not in direct electrical contact with the first conductive member 101. The second extension portion 105 extends independently from the second conductive member 102, that is, the second extension portion 105 is not in direct electrical contact with the second conductive member 102. The TCR of the resistor 100 according to this embodiment is 6.29 ppm / K. That is, the TCR of the resistor 100 with the pins arranged on the side in this embodiment is significantly lower than that of the existing resistor with the pins arranged in the center. In one embodiment, the first extension portion 104 and the first conductive member 101 are not formed on the same conductor, and the second extension portion 105 and the second conductive member 102 are not formed on the same conductor either. The first extension portion 104 and the second extension portion 105 extend in a direction away from the resistor element 103, and the extension direction is not limited to being parallel to the first conductive member 101, the second conductive member 102, or the main current direction D1.

[0080] In one embodiment, the resistor element 103 of the resistor 100 has a groove 131 formed at the first edge of the resistor element 103. The groove 131 extends from the first edge of the resistor element 103 towards the second edge of the resistor element 103. Preferably, the groove 131 is only provided on the resistor element 103 that does not extend to or is not provided on the first extension portion 104 and the second extension portion 105, so that the TCR of the resistor 100 is better and the structural strength of the first extension portion 104 and the second extension portion 105 is better. Preferably, the groove 131 is elongated and its extending direction is perpendicular to (or not parallel to) the main current direction D1. In one embodiment, the resistor element 103 may also have another groove 132 formed at the second edge of the resistor element 103 opposite to the first edge. The other groove 132 extends from the second edge of the resistor element 103 towards the first edge of the resistor element 103. Preferably, the other groove 132 is elongated and its extending direction is perpendicular to (or not parallel to) the main current direction D1, the extending direction of the first interval 134, or the extending direction of the second interval 135. The method of forming the groove 131 and the other groove 132 can be, for example, by local laser cutting, milling, stamping, or other methods that can remove materials from the resistor element 103. The groove 131 or the other groove 132 has a depth, whereby the resistance value of the resistor 100 is adjusted by the magnitude of the depth, so that the error of the resistance value of the resistor 100 is reduced. Among them, the first extension portion 104 and the second extension portion 105 are equidistant from each other with respect to the resistor element 103 in the main current direction D1, that is, Figure 2 from a perspective, the first extension portion 104 and the second extension portion 105 are located at the same horizontal height and have the same distance from the resistor element 103. In one embodiment, no grooves are formed on the sides of the first conductive member 101 and the second conductive member 102, and only grooves 131 or the other groove 132 are formed on the sides of the resistor element 103.

[0081] In one embodiment, as Figure 1 and Figure 2 shown, the first conductive member 101 is formed with a first locking hole 111, and the second conductive member 102 is formed with a second locking hole 112. Individual screws can be respectively inserted into the first locking hole 111 and the second locking hole 112 of the resistor 100 to lock the resistor 100 in a battery module.

[0082] Figure 4 is a top view of a resistor according to another embodiment. Figure 4 The embodiment of Figure 1 is similar to the embodiment of Figure 4As shown, the first conductive member 101 has a first bump 141 that extends outward perpendicular to (or not parallel to) the main current direction D1 and is located at the outer end of the end of the first conductive member 101. The second conductive member 102 has a second bump 142 that extends outward perpendicular to (or not parallel to) the main current direction D1 and is located at the outer end of the end of the second conductive member 102. The first bump 141 and the second bump 142 are located on two opposite sides of the resistor member 103, and an accommodation space 190, 191 is formed such that the first extension portion 104 and the second extension portion 105 are located within the accommodation space 190, 191. The first bump 141 and the second bump 142 do not directly contact the resistor member 103, the first extension portion 104, and the second extension portion 105. The first bump 141 and the second bump 142 are respectively located on the opposite sides of the first locking hole 111 and the second locking hole 112. When a battery of the power system or power conductive bars (BusBars) or lines 192, 193 on the current path are inserted into the first locking hole 111 and the second locking hole 112 of the resistor 100 through screws 231, 232 and are locked to the first conductive member 101 beside the first locking hole 111 and / or the second conductive member 102 beside the second locking hole 112, the power conductive bar (Bus Bar) or line 192 can simultaneously contact the first conductive member 101 and the first bump 141, and the power conductive bar (Bus Bar) or line 193 can simultaneously contact the second conductive member 102 and the second bump 142, thereby having better locking mechanical strength and lower joint resistance.

[0083] Figure 5 Is a perspective view of a resistor according to another embodiment. Figure 5 The embodiment of is similar to Figure 1 The embodiment of, so the same elements are denoted by the same reference numerals and their related descriptions are omitted. Only at least one difference between the two will be described below. As Figure 5 As shown, the first extension portion 104 and the second extension portion 105 are respectively bent in the direction of the normal to the surface of the first conductive member 101 or the second conductive member 102. In this embodiment, the first extension portion 104 and the second extension portion 105 are respectively bent downward from the first conductive member 101 or the second conductive member 102. The downwardly bent first extension portion 104 and second extension portion 105 can eliminate the structure of the nail, and the cost can be lower. Furthermore, the downwardly bent first extension portion 104 and second extension portion 105 can directly pass through the soldering holes of the detection circuit board, so it is easy to be positioned with the detection circuit board. In these embodiments, a part of these first extension portions 104 and second extension portions 105 can respectively serve as the first detection point 106, the second detection point 107, the third detection point 108, and the fourth detection point 109.

[0084] The TCR of the resistor 100 of the present invention can be reduced by increasing the spacing H1 of the first interval 134 or / and the spacing H2 of the second interval 135 of the resistor 100. Figure 6 TCR simulation diagrams of the resistor of the comparative example and the resistor according to an embodiment of the present invention. As Figure 6 shown, the resistor elements 103 of the resistor 10a, the resistor 10b, the resistor 10, and the resistor 100 are represented by the symbol Alloy, and their ranges are represented by dotted lines. As a comparative example, the resistance temperature coefficients of the resistor 10a and the resistor 10b are 116 ppm / k and 219 ppm / k, respectively. In contrast, the resistance temperature coefficients of the resistor 100 and the resistor 10 according to an embodiment of the present invention are 6 ppm / k and 32 ppm / k. Among them, the spacing H1 of the first interval 134 and the spacing H2 of the second interval 135 of the resistor 10 are different from the spacing H1 and the spacing H2 of the resistor 100. As can be seen from the above, the resistors 10 and 100 of this case can optimize the resistance temperature coefficients of the resistors 10 and 100 by adjusting the spacing H1 of the first interval 134 and the spacing H2 of the second interval 135. It can be seen from this that the resistors 10 and 100 according to an embodiment of the present invention can effectively reduce the resistance temperature coefficient.

[0085] In the present invention, the first detection point 106 and the second detection point 107 may not be pins either. In one embodiment, a detection circuit of an external detection printed circuit board may be adhesively attached (such as soldering with tin-containing solder) to the surface of the resistor 100. For example, a detection circuit on an external detection printed circuit board is adhesively attached to the surface of the resistor 100. And the detection circuit of the printed circuit board is electrically connected to the first extension portion 104 and the second extension portion 105 through the first detection point 106 and the second detection point 107 as conduction paths.

[0086] Figure 7A A perspective view of a resistor according to another embodiment. As Figure 7AAs shown, the resistor 100 further includes a conductive frame 200. The conductive frame 200 includes a first conductive lead-out structure 201 serving as the first detection point 106 and a second conductive lead-out structure 202 serving as the second detection point 107. The first end of the first conductive lead-out structure 201 is welded (e.g., pressure fusion welding) or soldered with tin solder (electrical bonding) to the first extension 104, and the first end of the second conductive lead-out structure 202 is welded (e.g., pressure fusion welding) or soldered with tin solder (electrical bonding) to the second extension 105. The first conductive lead-out structure 201 and the second conductive lead-out structure 202 include a first end and a second end, and respectively extend from the first end, cross the first interval 134 and the second interval 135, and after extending to the middle part of the resistor 100, extend in the normal direction of the surface of the resistor 100 to protrude from the surface of the resistor 100 and extend to the second end. The first conductive lead-out structure 201 and the second conductive lead-out structure 202 are used to connect to a current detection device, such as a current detection unit of a vehicle-mounted management system, for detecting the magnitude of the current. Figure 7B Is a perspective view of a resistor according to another embodiment. In one embodiment, as Figure 7B shown, the resistor 100 further includes an electrically insulating housing 210, which is an injection-molded structure and forms a connector with the conductive frame 200. The electrically insulating housing 210 is disposed on the surface of the middle part of the resistor 100 and is hollow, and its middle part defines an accommodating space, and the second ends of the first conductive lead-out structure 201 and the second conductive lead-out structure 202 are located in the accommodating space of the electrically insulating housing 210. The electrically insulating housing 210 can be easily and detachably connected to the connector of the current detection device or the connector of the wire group therein, so that the first conductive lead-out structure 201 and the second conductive lead-out structure 202 are used to connect to the current detection device. In one embodiment, the resistor 100 further includes at least one reinforcing structure 181, and one end of the reinforcing structure 181 is fixed to the first conductive member 101 or / and the second conductive member 102 (e.g., fixed by pressure fusion welding). The other end of the reinforcing structure 181 is fixedly covered by the electrically insulating housing 210 (e.g., fixed by injection molding).

[0087] According to the present invention, by independent main current and voltage sampling paths, the resistance temperature coefficient (TCR) of the product is reduced, and better product characteristics are achieved. More specifically, the first extension 104 does not directly contact the first conductive member 101, the second extension 105 does not directly contact the second conductive member 102, and the first extension 104 and the second extension 105 are used as voltage detection terminals, so as to reduce the error amount of the detected voltage affected by the position deviation generated during manufacturing at the voltage sampling point.

Claims

1. A resistor having a low temperature coefficient of resistance, characterized in that: include: a resistor; a first conductive element connected to a first side of the resistor; a second conductive element connected to the second side of the resistor; a first extending portion, connected to the first side of the resistor, extending in a direction away from the resistor, and spaced apart from the first conductive element; a second extending portion, connected to the second side of the resistor, extending in a direction away from the resistor, and spaced apart from the second conductive member; a first detection point, disposed on the first extension portion; and A second detection point is disposed on the second extension portion.

2. The resistor according to claim 1, characterized in that The first conductive element and the first extension portion are melt-welded to the first side of the resistor, The second conductive element and the second extension portion are melt-welded to the second side of the resistor. The welding structure on the resistor between the first conductive member and the first extension portion is partially or completely removed. The welding structure on the resistor between the second conductive element and the second extending portion is partially or completely removed.

3. The resistor according to claim 2, characterized in that A first welding structure is formed between the resistor and the first conductive member, a third welding structure is formed between the resistor and the first extension portion, and a first intermediate welding structure is connected between the first welding structure and the third welding structure, and A second welding structure is formed between the resistor and the second conductive member, a fourth welding structure is formed between the resistor and the second extension portion, and a second intermediate welding structure is connected between the second welding structure and the fourth welding structure. Wherein, the first middle welding structure and / or the second middle welding structure comprises at least one groove, and the at least one groove faces a direction away from the resistor.

4. The resistor according to claim 2, characterized in that A first welding structure is formed between the resistor and the first conductive member, a third welding structure is formed between the resistor and the first extension portion, and the first welding structure and the third welding structure are spaced apart from each other, and A second welding structure is formed between the resistor and the second conductive member, a fourth welding structure is formed between the resistor and the second extension portion, and the second welding structure is spaced apart from the fourth welding structure. Wherein, two side edges of the resistor further have a first notch and / or a second notch.

5. The resistor according to claim 4, characterized in that A first gap is formed between the first extension portion and the first conductive member, a second gap is formed between the second extension portion and the second conductive member, and The first notch and the second notch correspond to the first interval and the second interval respectively.

6. The resistor according to any one of claims 1 to 4, characterized in that A first interval is formed between the first extending portion and the first conductive member, and a second interval is formed between the second extending portion and the second conductive member.

7. The resistor according to claim 6, characterized in that The widths of the first interval and the second interval are in the range of 1.0 to 3.5 mm.

8. The resistor according to claim 1, wherein The resistor has a groove formed at a first edge of the resistor.

9. The resistor according to claim 1, characterized in that The first conductive member is formed with a first locking hole, and the second conductive member is formed with a second locking hole.

10. The resistor according to claim 1, wherein The first extension portion and the second extension portion are bent toward a normal direction of a surface of the first conductive member or the second conductive member, respectively.

11. The resistor according to claim 1, wherein The first detection point and the second detection point are nails.

12. The resistor according to claim 1, wherein It also includes a conductive frame and an electrically insulating housing, which together form a connector, wherein: The conductive frame includes a first conductive lead-out structure and a second conductive lead-out structure. The first end of the first conductive lead-out structure is bonded to the first extension portion as the first detection point; the first end of the second conductive lead-out structure is bonded to the second extension portion as the second detection point; and The electrically insulating shell is disposed on the surface of the resistor and is hollow. The electrically insulating shell defines a containing space. The second ends of the first conductive lead-out structure and the second conductive lead-out structure are located in the containing space of the electrically insulating shell.

13. The resistor according to claim 12, characterized in that The electrical insulation housing is arranged on the surface of the middle portion of the resistor.

14. The resistor according to claim 12, wherein It also includes at least one reinforcement structure, one end of the at least one reinforcement structure is fixed to the first conductive member and / or the second conductive member, and the other end of the at least one reinforcement structure is fixed by being wrapped by an electrical insulating shell.

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