Resistor body and resistor

Abstract

The utility model relates to a resistor body and a resistor, and relates to the technical field of resistors. The resistor body provided by the utility model comprises a plate-shaped core material which is of a rectangular plate-shaped structure wound with a resistance wire; the first connecting terminal is electrically connected with the starting end of the resistance wire; and a second connection terminal electrically connected to a terminal of the resistance wire. The plate-shaped core material has a pair of first protrusions and a pair of second protrusions at both ends in the longitudinal direction thereof, respectively. The resistance wire can form an effective acting point through the first protruding part and the second protruding part which are arranged on the plate-shaped core material, so that when the resistance wire is wound on the plate-shaped core material, the resistance wire can be wound in the mode that the first protruding part and the second protruding part are hung near the starting end and the terminal end of the resistance wire; therefore, the resistance wire is prevented from loosening, and it is guaranteed that the resistance wire is wound on the plate-shaped core material in a certain tension state.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, and in particular to a resistor element and a resistor. Background Technology

[0002] Resistors meeting high-voltage (800V, 1200V) requirements, when used in automobiles, can accelerate vehicle electrification, enabling longer driving ranges and shorter charging times. These resistors typically consist of a plate-shaped core with resistance wire wound around it. The start and end of the resistance wire are soldered to connecting terminals. Because the core is generally plate-shaped, it's difficult to establish effective contact points between the start and end of the resistance wire and the core during winding, making the resistance wire prone to loosening. Utility Model Content

[0003] This utility model provides a resistive element and a resistor to solve at least one of the above-mentioned technical problems.

[0004] According to a first aspect of the present invention, the present invention provides a resistive element, comprising:

[0005] The core material is a rectangular plate structure with resistance wires wound around it.

[0006] A first connection terminal is electrically connected to the starting end of the resistance wire; and

[0007] The second connection terminal is electrically connected to the end of the resistor wire;

[0008] The plate-shaped core material has a pair of first protrusions and a pair of second protrusions at its two ends along its long side; the first connecting terminal is located on the side of the first protrusion away from the second protrusion, the second connecting terminal is located on the side of the second protrusion away from the first protrusion, and the resistance wire is located between the first protrusion and the second protrusion.

[0009] In one embodiment, both the first protrusion and the second protrusion protrude along the short side of the plate-shaped core material, and the protrusion heights of the first protrusion and the second protrusion are the same.

[0010] In one embodiment, the first protrusion and the second protrusion are respectively attached near the start end and the end end of the resistance wire.

[0011] In one embodiment, the plate-shaped core material further has a pair of third protrusions and a pair of fourth protrusions at each end in the long side direction. The pair of third protrusions are respectively located on the side of the first protrusion away from the second protrusion, and the pair of fourth protrusions are respectively located on the side of the second protrusion away from the first protrusion. The first connecting terminal is located between the first protrusion and the corresponding third protrusion, and the second connecting terminal is located between the second protrusion and the corresponding fourth protrusion.

[0012] In one embodiment, the outer surface of each of the third protrusions in the long side direction of the plate-shaped core material is aligned with one end face of the short side of the plate-shaped core material, and the outer surface of each of the fourth protrusions in the long side direction of the plate-shaped core material is aligned with the other end face of the short side of the plate-shaped core material.

[0013] In one embodiment, the plate-shaped core material has one or more first through holes at both ends of its long side, the first through holes penetrating the plate-shaped core material along its thickness direction, and the first through holes are respectively located between the third protrusion and the first protrusion and between the fourth protrusion and the second protrusion.

[0014] Both the first connecting terminal and the second connecting terminal are provided with one or more connecting terminal protrusions, which protrude toward the corresponding first through hole and cooperate with the corresponding first through hole.

[0015] In one embodiment, the plate-shaped core material has a second through hole at each end of its long side, the second through hole penetrating the plate-shaped core material along its thickness direction, and the second through hole is located between the third protrusion and the first protrusion and between the fourth protrusion and the second protrusion, respectively.

[0016] The first connecting terminal and the second connecting terminal respectively cover the corresponding second through hole.

[0017] In one embodiment, when there are multiple first through holes, each first through hole is arranged sequentially around the corresponding second through hole in the circumferential direction.

[0018] In one embodiment, the diameter of the first through hole is smaller than the diameter of the second through hole.

[0019] According to a second aspect of the present invention, the present invention provides a resistor including the above-mentioned resistive element, the resistor further including a housing, the housing accommodating one or more of the resistive elements, the long side direction of the resistive element being the same as the long side direction of the housing;

[0020] The resistor has a pair of external terminals, which are disposed on the resistor in such a way that a portion of the external terminals protrude from the housing, and are electrically connected to the first connection terminal and the second connection terminal, respectively.

[0021] In one embodiment, when there are multiple resistors, the first connection terminal and / or the second connection terminal have welding tabs for welding with other connection terminals, thereby electrically connecting the multiple resistors by welding the welding tabs.

[0022] Compared with the prior art, the advantage of this utility model is that the resistance wire can form an effective force point by relying on the first protrusion and the second protrusion provided on the plate-shaped core material. Therefore, when the resistance wire is wound on the plate-shaped core material, it can be wound in such a way that the first protrusion and the second protrusion are hooked near the starting end (i.e. the end near the first connecting terminal) and the end (i.e. the end near the second connecting terminal), thereby preventing the resistance wire from loosening and ensuring that the resistance wire is wound on the plate-shaped core material with a certain tension. Attached Figure Description

[0023] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings;

[0024] Figure 1 This is a three-dimensional structural diagram of the resistor in embodiment 1 of this utility model;

[0025] Figure 2 This is a front view of the resistive element in Embodiment 1 of this utility model;

[0026] Figure 3 yes Figure 1 The front view of the plate-shaped core material shown, where resistance wires are not shown;

[0027] Figure 4 This is a cross-sectional view of a resistor having the resistive element shown in Embodiment 1 of this utility model, wherein the cross-sectional lines are not shown;

[0028] Figure 5 This is a three-dimensional structural diagram of the resistor in embodiment 2 of this utility model;

[0029] Figure 6 This is a three-dimensional structural diagram of the resistor in Embodiment 2 of this utility model, wherein the resistance wire is not shown;

[0030] Figure 7 yes Figure 5 The front view of the plate-shaped core material shown, where resistance wires are not shown;

[0031] Figure 8This is a front view of the resistive element in Embodiment 3 of this utility model;

[0032] Figure 9 yes Figure 8 The front view of the plate-shaped core material shown, where resistance wires are not shown;

[0033] Figure 10a yes Figure 8 A cross-sectional view of the plate-shaped core material shown, in which the cross-section of the second through hole is shown;

[0034] Figure 10b yes Figure 8 The cross-sectional view of the plate-shaped core material shown illustrates the first and second welding electrodes on both sides of the cross-section of the second through hole, as well as the welding current path.

[0035] Figure 10c This is a cross-sectional view of the core material in the prior art;

[0036] Figure 10d This is a cross-sectional view of the core material of the prior art, showing the current path for welding;

[0037] Figure 11 This is a cross-sectional view of a resistor having the resistive element shown in Embodiment 3 of the present invention, wherein the cross-sectional lines are not shown;

[0038] Figure 12 This is a three-dimensional structural diagram of the resistor with three resistive elements in Embodiment 4 of this utility model;

[0039] Figure 13 This is a three-dimensional structural diagram of the resistor in Embodiment 4 of this utility model, which only shows the shell and the plate-shaped core material;

[0040] Figure 14a yes Figure 13 A three-dimensional structural schematic diagram of the shell shown;

[0041] Figure 14b yes Figure 13 A modified example of the shell shown;

[0042] Figure 15 yes Figure 14a A sectional view at A1-A1, where section lines are not shown;

[0043] Figure 16 yes Figure 14a A sectional view at A2-A2, where section lines are not shown;

[0044] Figure 17a yes Figure 14a A sectional view at BB, where section lines are not shown;

[0045] Figure 17bIs Figure 17a The diagram shows a structure in which the core material is placed inside the shell, with the core material shown in dashed lines.

[0046] Figure 18 yes Figure 14a A three-dimensional sectional view at BB, where section lines are not shown;

[0047] Figure 19 yes Figure 18 Enlarged view at point I.

[0048] Figure label:

[0049] 20. Resistor; 21. Plate-shaped core material; 22. Resistance wire;

[0050] 211. Winding section; 212. First end; 213. Second end;

[0051] 201. First protrusion; 202. Second protrusion; 203. Third protrusion; 204. Fourth protrusion;

[0052] 205. First through hole; 206. Second through hole;

[0053] 23. First connecting terminal; 24. Second connecting terminal; 25. Welding part; 26. Welding piece;

[0054] 231. First connecting terminal protrusion; 232. First connecting piece;

[0055] 241. Second connecting terminal protrusion; 242. Second connecting piece;

[0056] 31. First welding electrode; 32. Second welding electrode; 33. Current path;

[0057] 10. Housing; 40. External terminals;

[0058] 11. First inner sidewall; 12. Second inner sidewall; 13. Inner bottom surface;

[0059] 14. Protruding part; 141. First convex part; 142. Second convex part; 143. Concave part; 144. Guide part; 145. Accommodating part;

[0060] 1431. The first concave part; 1432. The second concave part; 1433. The third concave part;

[0061] 15. Third inner wall; 16. Fourth inner wall;

[0062] 18. partition wall; 19. pedestal; 191. boss. Detailed Implementation

[0063] The present invention will be further described below with reference to the accompanying drawings.

[0064] Example 1

[0065] like Figures 1-3 As shown, this utility model provides a resistor element 20, including a plate-shaped core material 21, a first connecting terminal 23, and a second connecting terminal 24. The plate-shaped core material 21 is constructed as a rectangular plate structure with a resistance wire 22 wound around it. The plate-shaped core material 21 is made of an insulating substrate, such as a mica substrate or a ceramic substrate. The resistance wire 22 wound on the plate-shaped core material 21 can be NiCr (nickel-chromium) wire, and parameters such as the number of turns and the wire diameter of the resistance wire 22 can be adjusted according to the resistance value. The first connecting terminal 23 is electrically connected to the starting end of the resistance wire 22, and the second connecting terminal 24 is electrically connected to the ending end of the resistance wire 22. Both the first connecting terminal 23 and the second connecting terminal 24 are constructed by punching and bending a metal plate such as stainless steel.

[0066] Among them, the plate-shaped core material 21 is in its long side direction (e.g. Figure 1 The two ends of the (shown in the X-axis direction) have a pair of first protrusions 201 and a pair of second protrusions 202, respectively. Figure 1 As shown, the plate-shaped core material 21 includes a first end 212, a second end 213, and a winding portion 211 located between the first end 212 and the second end 213. The first end 212 and the second end 213 are symmetrical about the center of the plate-shaped core material 21. Resistance wire 22 is wound around the winding portion 211 of the plate-shaped core material 21. Figure 3 As shown, a first protrusion 201 is provided on the upper and lower sides of the first end 212, and a second protrusion 202 is provided on the upper and lower sides of the second end 213.

[0067] like Figure 1 As shown, the first connecting terminal 23 is located on the side of the first protrusion 201 away from the second protrusion 202, the second connecting terminal 24 is located on the side of the second protrusion 202 away from the first protrusion 201, and the resistance wire 22 is located between the first protrusion 201 and the second protrusion 202. More specifically, as... Figure 1 As shown, the first connecting terminal 23 is located on the side opposite to the resistance wire 22 and the second protrusion 202, separated by the first protrusion 201, and the second connecting terminal 24 is located on the side opposite to the resistance wire 22 and the first protrusion 201, separated by the second protrusion 202.

[0068] The first protrusion 201 and the second protrusion 202 are both along the short side of the plate-shaped core material 21 (e.g., Figure 1 (As shown in the Z-axis direction) protrudes. For example... Figure 3As shown, first protrusions 201 are respectively provided on the upper and lower sides of the first end 212, and the two are symmetrical about the center of the plate-shaped core material 21. Similarly, second protrusions 202 are respectively provided on the upper and lower sides of the second end 213, and the two are symmetrical about the center of the plate-shaped core material 21. Therefore, as Figure 3 As shown, the first protrusion 201 protrudes outward from both the upper and lower sides of the first end 212 at the same height, which is h1; the second protrusion 202 protrudes outward from both the upper and lower sides of the first end 212 at the same height, which is h2, and h1 = h2.

[0069] like Figure 1 and Figure 2 As shown, since the first protrusion 201 and the second protrusion 202 protrude relative to the upper and lower sides of the plate-shaped core material 21, on the one hand, when the resistance wire 22 is wound on the winding part 211, an effective force point can be formed between the resistance wire 22 and the first protrusion 201 and the second protrusion 202, that is, near the starting end of the resistance wire 22 (i.e., the end near the first connecting terminal 23) (i.e., at a certain distance from the starting end) and near the end (i.e., the end near the second connecting terminal 24) (i.e., at a certain distance from the end). At a certain distance, the resistance wire 22 can be wound around the first protrusion 201 and the second protrusion 202, thereby preventing the resistance wire 22 from loosening. Furthermore, since the first protrusion 201 and the second protrusion 202 can be hooked near the starting and ending points of the resistance wire 22, and the starting and ending points of the resistance wire 22 are in angular contact with the upper and lower surfaces of the winding portion 211 and the plate-shaped core material 21 respectively, the winding direction of the resistance wire 22 can be changed without applying additional force during winding. For example... Figure 1 In the winding method shown, the resistance wire 22 is wound in a spiral manner in the winding section 211 in a direction approximately perpendicular to the long side direction of the plate-shaped core material 21, and its terminal or starting end is connected to the welding section 25 (such as...). Figure 1 (As shown) can be wound along an inclined direction, such as Figure 4 As shown, due to the provision of the first protrusion 201 and the second protrusion 202, the welding part 25 can be wound in an inclined direction using the transition position between the first protrusion 201 and the winding part 211 and the transition position between the second protrusion 202 and the winding part 211 as the point of force. On the other hand, the first protrusion 201 and the second protrusion 202 can also determine the position of the first connecting terminal 23 and the second connecting terminal 24. That is, the first connecting terminal 23 can also abut against the side of the first protrusion 201, and the second connecting terminal 24 can also abut against the side of the second protrusion 202, thereby facilitating the positioning of the first connecting terminal 23 and the second connecting terminal 24.

[0070] Therefore, it can be understood that the protrusion height h1 of the first protrusion 201 is greater than or equal to the distance between the upper surface of the first connecting terminal 23 and the upper surface of the plate-shaped core material 21. That is, after the first connecting terminal 23 is installed on the plate-shaped core material 21, its upper surface is aligned with the upper surface of the first protrusion 201, or slightly lower than the upper surface of the first protrusion 201 (e.g., Figure 4 (As shown). Similarly, the protrusion height h2 of the second protrusion 202 is greater than or equal to the distance between the upper surface of the second connecting terminal 24 and the upper surface of the plate-shaped core material 21. That is, after the second connecting terminal 24 is installed on the plate-shaped core material 21, its upper surface is aligned with or slightly lower than the upper surface of the second protrusion 202. Figure 4 (As shown).

[0071] Furthermore, such as Figure 4 As shown, when the resistor 20 is placed into the resistor housing 10, the first protrusion 201 and the second protrusion 202 on the lower side of the plate-shaped core 21 protrude outward, so they can contact the inner bottom surface 13 of the housing 10. This prevents the lower side of the winding portion 211 and the resistance wire 22 wound on it from contacting the inner bottom surface 13 of the housing 10. Instead, there is a certain distance between them, which ensures the insulation distance between the inner bottom surface 13 of the housing 10 and the resistance wire 22. Therefore, it is not necessary to install insulating components (such as mica plates). Since the first protrusion 201 and the second protrusion 202 protrude at the same height, it can be ensured that the plate-shaped core 21 will not tilt when it is placed into the resistor housing 10.

[0072] Furthermore, since sealing material is injected into the housing 10 after the resistor 20 is placed inside the resistor housing 10, a certain gap is formed between the lower side of the winding portion 211 and the resistor wire 22 and the inner bottom surface 13 of the housing 10 through the first protrusion 201 and the second protrusion 202, making it easy for the sealing material to be wound around to various positions of the inner bottom surface 13 of the housing 10.

[0073] The first protrusion 201 and the second protrusion 202 can be rectangular blocks, bosses, or other protrusions, which can be integrally formed with the plate-shaped core material 21, or can be fixedly connected to the plate-shaped core material 21 by means of bonding or other methods.

[0074] Example 2

[0075] Based on Embodiment 1 above, a modified Embodiment 2 is provided. The following will mainly describe the differences between Embodiment 2 and Embodiment 1, while the similarities will not be repeated.

[0076] like Figures 5-7As shown in Embodiment 2, the plate-shaped core material 21 also has a pair of third protrusions 203 and a pair of fourth protrusions 204 at both ends in the long side direction. The third protrusions 203 are located on the side of the first protrusion 201 away from the second protrusion 202, and the fourth protrusions 204 are located on the side of the second protrusion 202 away from the first protrusion 201. The first connecting terminal 23 is located between the first protrusion 201 and the third protrusion 203, and the second connecting terminal 24 is located between the second protrusion 202 and the fourth protrusion 204.

[0077] The outer surface of the third protrusion 203 (the outer surface in the long side direction of the plate-shaped core material 21) and one end face of the short side of the plate-shaped core material 21 (such as...) Figure 7 The left end face of the plate-shaped core material 21 shown is aligned with each other, and the outer side of the fourth protrusion 204 (the outer side in the direction of the long side of the plate-shaped core material 21) is aligned with the other end face of the short side of the plate-shaped core material 21 (as shown). Figure 7 The right end faces of the plate-shaped core material 21 shown are aligned with each other.

[0078] The third protrusion 203 and the fourth protrusion 204 can serve as positioning structures for the first connecting terminal 23 and the second connecting terminal 24, respectively. The dimension of the first connecting terminal 23 in the X-axis direction is the same as the distance between the first protrusion 201 and the third protrusion 203, and the dimension of the second connecting terminal 24 in the X-axis direction is the same as the distance between the second protrusion 202 and the fourth protrusion 204. Therefore, the first connecting terminal 23 is locked between the first protrusion 201 and the third protrusion 203, and the second connecting terminal 24 is locked between the second protrusion 202 and the fourth protrusion 204. Thus, the third protrusion 203 and the fourth protrusion 204 can determine the position of the first connecting terminal 23 and the second connecting terminal 24 and prevent them from falling off.

[0079] The first protrusion 201, the second protrusion 202, the third protrusion 203, and the fourth protrusion 204 all have the same protrusion height. Therefore, when the resistor 20 is placed into the resistor housing 10, the first protrusion 201, the second protrusion 202, the third protrusion 203, and the fourth protrusion 204 on the lower side of the plate-shaped core 21 can contact the inner bottom surface 13 of the housing 10, ensuring that the plate-shaped core 21 does not tilt.

[0080] Furthermore, such as Figure 7As shown, the plate-shaped core material 21 has one or more first through holes 205 at both ends in the long side direction. That is, the first end 212 is provided with one or more first through holes 205, which is located between the third protrusion 203 and the first protrusion 201. The second end 213 is provided with one or more first through holes 205, which is located between the fourth protrusion 204 and the second protrusion 202. When the third protrusion 203 and the fourth protrusion 204 are not provided on the plate-shaped core material 21, the first end 212 between one end face of the short side of the plate-shaped core material 21 and the first protrusion 201 has a first through hole 205, and the second end 213 between the other end face of the short side of the plate-shaped core material 21 and the second protrusion 202 has a first through hole 205.

[0081] The first through hole 205 at the first end 212 and the first through hole 205 at the second end 213 are arranged symmetrically about the center of the plate-shaped core material 21. Alternatively, it can be conceivable that the first through hole 205 at the first end 212 is different from the first through hole 205 at the second end 213, for example, the number of first through holes 205 at the first end 212 is more (or less) than the number of first through holes 205 at the second end 213.

[0082] Each of the aforementioned first through holes 205 is along the thickness direction of the plate-shaped core material 21 (e.g., Figure 6 The plate-shaped core material 21 (shown in the Y-axis direction) is penetrated to facilitate the connection of the corresponding first connecting terminal 23 and second connecting terminal 24.

[0083] Both the first connecting terminal 23 and the second connecting terminal 24 are provided with one or more connecting terminal protrusions, which protrude toward the corresponding first through hole 205 and cooperate with the corresponding first through hole 205.

[0084] Specifically, such as Figure 6 As shown, the protruding portion of the first connecting terminal 23 is the first connecting terminal protrusion 231, which corresponds to at least one first through hole 205 of the first end 212 (please refer to...). Figure 7 The protruding portion of the second connecting terminal 24 is the second connecting terminal protrusion 241, which corresponds to at least one first through hole 205 of the second end 213 (please refer to...). Figure 7 Therefore, when the first connecting terminal 23 is disposed between the third protrusion 203 and the first protrusion 201, the first connecting terminal protrusion 231 on it is inserted into the corresponding first through hole 205 of the first end 212, thereby fixing it to the plate-shaped core material 21; similarly, when the second connecting terminal 24 is disposed between the second protrusion 202 and the fourth protrusion 204, the second connecting terminal protrusion 241 on it is inserted into the corresponding first through hole 205 of the second end 213, thereby fixing it to the plate-shaped core material 21.

[0085] like Figure 5 As shown, the first connecting terminal 23 includes a first connecting piece 232, on which a first connecting terminal protrusion 231 is provided. The second connecting terminal 24 includes a second connecting piece 242, on which a second connecting terminal protrusion 241 is provided. When the first connecting piece 232 is mounted on the surface of the first end 212, the first connecting terminal protrusion 231 is inserted into the corresponding first through hole 205. When the second connecting piece 242 is mounted on the surface of the second end 213, the second connecting terminal protrusion 241 is inserted into the corresponding first through hole 205.

[0086] Furthermore, since the lengths of the first connecting piece 232 and the second connecting piece 242 can be different, the number of first through holes 205 can be set to multiple to facilitate matching of connecting pieces of different specifications. Multiple first through holes 205 can be spaced apart along both the long and short sides of the plate-shaped core material 21. For example... Figure 7 As shown, the four first through holes 205 form a 2×2 square array structure. Figure 5 As shown, two first connecting terminal protrusions 231 can be provided on the first connecting piece 232, and two second connecting terminal protrusions 241 can be provided on the second connecting piece 242. Figure 5 As shown, the second connecting piece 242 is shorter, and its second connecting terminal protrusion 241 can be connected to the first through hole 205 closer to the upper side of the plate-shaped core material 21; the first connecting piece 232 is longer, and its first connecting terminal protrusion 231 can be connected to the first through hole 205 closer to the lower side of the plate-shaped core material 21. Therefore, by providing multiple first through holes 205, the plate-shaped core material 21 can be matched with first connecting terminals 23 and second connecting terminals 24 of different sizes, thereby reducing costs.

[0087] Example 3

[0088] Based on Embodiment 2 described above, a modified Embodiment 3 is provided. The following will mainly describe the differences between Embodiment 3 and Embodiment 2, while the similarities will not be repeated.

[0089] like Figure 8 and Figure 9 As shown, the plate-shaped core material 21 is provided with a second through hole 206 at both ends in the long side direction. The second through hole 206 penetrates the plate-shaped core material 21 along the thickness direction. The second through hole 206 is located between the third protrusion 203 and the first protrusion 201, and between the fourth protrusion 204 and the second protrusion 202.

[0090] like Figure 8As shown, the first connecting terminal 23 and the second connecting terminal 24 respectively cover the corresponding second through hole 206. The second through hole 206 is a hole for welding the resistance wire 22. When the third protrusion 203 and the fourth protrusion 204 are not provided on the plate-shaped core material 21, the second through hole 206 is provided between one end face of the short side of the plate-shaped core material 21 and the first protrusion 201, that is, the first end 212, and the second through hole 206 is provided between the other end face of the short side of the plate-shaped core material 21 and the second protrusion 202, that is, the second end 213.

[0091] During welding, the starting end and the ending end of the resistance wire 22 are welded to the surface of the first connecting piece 232 of the first connecting terminal 23 and the surface of the second connecting piece 242 of the second connecting terminal 24, respectively. The welding process involves the first welding electrode 31 being contacted from the back side of the first connecting piece 232 (second connecting piece 242) of the first connecting terminal 23 (second connecting terminal 24), and the second welding electrode 32 being contacted from the surface side of the first connecting piece 232 (second connecting piece 242) of the first connecting terminal 23 (second connecting terminal 24), with the starting end or ending end of the resistance wire 22 sandwiched between them. Current flows between the first welding electrode 31 and the second welding electrode 32 to heat the welding part 25 and apply pressure for welding. At this time, the longer the current path (the distance the current travels from the first welding electrode 31 to the second welding electrode 32), the larger the current needs to be, resulting in: ① reduced production efficiency; ② the possibility of resistance wire damage; ③ the problem of resistance wire detachment when the current is insufficient.

[0092] To solve the above problems, in this utility model, such as Figure 10a and Figure 10b As shown, the second welding electrode 32 directly abuts against the back surfaces of the first connecting piece 232 and the second connecting piece 242 through the second through hole 206, thus shortening the distance the current needs to travel from the first welding electrode 31 to the second welding electrode 32. Therefore, as... Figure 10b As shown, when current flows for welding, the current path 33 is formed along the thickness direction of the first connecting piece 232 (the second connecting piece 242).

[0093] Therefore, in existing technologies, such as Figure 10c and Figure 10dAs shown, since no welding holes are provided on the plate-shaped core material 21, when the two welding electrodes are used to weld one of the connecting terminals and the resistance wire 22 between them, the current path passes through both sides and the top of the connecting terminal. That is to say, in the prior art, the welding electrodes on both sides of the connecting terminal and the resistance wire need to pass over the top part of the connecting terminal to connect, forming a long current path; while in this utility model, since a second through hole 206 is provided, a shorter current path 33 is formed between the first welding electrode 31 and the second welding electrode 32 on both sides of the first connecting piece 232 (second connecting piece 242) of the first connecting terminal 23 (second connecting piece 242) and the resistance wire 22. Therefore, compared with the prior art, this utility model can: ① improve production efficiency; ② reduce the possibility of damage to the resistance wire 22; ③ avoid the problem of the resistance wire 22 falling off when the current is insufficient.

[0094] Furthermore, such as Figure 8 and Figure 9 As shown, when there are multiple first through holes 205, each first through hole 205 is arranged sequentially around the corresponding second through hole 206 in the circumferential direction. For example, when the first through holes 205 form a square array structure, the second through hole 206 is located at its center.

[0095] In addition, the diameter of the first through hole 205 can be set to be smaller than the diameter of the second through hole 206. Since the diameter of the first through hole 205 is smaller, the problem of misoperation of welding the first welding electrode 31 and the second welding electrode 32 through the first through hole 205 can be avoided.

[0096] Furthermore, since the diameter of the first through hole 205 is set to be smaller, it can prevent the plate-shaped core material 21 from cracking (because if the diameter of the first through hole 205 is greater than or equal to the diameter of the second through hole 206, the strength of the plate-shaped core material 21 will be reduced accordingly).

[0097] Example 4

[0098] like Figure 4 , Figure 11 and Figure 12 As shown, this utility model also provides a resistor, including the resistive element 20 described in the above embodiments. The resistor further includes a housing 10, in which one or more resistive elements 20 are housed. The long side of the resistive element 20 is perpendicular to the housing 10 (e.g., ...). Figure 11 The long side of the X-axis (as shown) is in the same direction.

[0099] like Figure 12As shown, the resistor 20 has a pair of external terminals 40, which are disposed on the resistor 20 with a portion protruding from the housing 10. The external terminals 40 are electrically connected to the solder tabs 26 of the first connection terminal 23 and the second connection terminal 24, respectively.

[0100] like Figure 12 As shown, when there are multiple resistors 20, their first connection terminal 23 and / or second connection terminal 24 are equipped with welding tabs 26 for soldering to other connection terminals. Multiple resistors 20 are electrically connected by soldering the welding tabs 26. Figure 12 As shown, the welding piece 26 is a thin piece that protrudes laterally from a portion of the first connection terminal 23 and / or the second connection terminal 24 toward the resistor 20 (connection terminal) that is adjacent to the first connection terminal 23 and the second connection terminal 24, respectively.

[0101] Multiple resistors 20 can be connected in series or in parallel. When connecting the first connection terminal 23 and the second connection terminal 24 on each plate core material 21, the welding pieces of the first connection terminal 23 and the second connection terminal 24 can be overlapped and welded to ensure the stability of the connection.

[0102] like Figure 4 As shown, by providing the first protrusion 201 and the second protrusion 202, when the resistor 20 is placed into the resistor housing 10, since the first protrusion 201 and the second protrusion 202 on the lower side of the plate-shaped core material 21 can contact the inner bottom surface 13 of the housing 10, the lower side of the winding part 211 and the resistance wire 22 wound on it will not contact the inner bottom surface 13 of the housing 10, but will have a certain distance between them. This ensures the insulation distance between the inner bottom surface 13 of the housing 10 and the resistance wire 22, thus eliminating the need for insulating components (such as mica plates).

[0103] like Figure 11 As shown, the first protrusion 201, the second protrusion 202, the third protrusion 203 and the fourth protrusion 204 are all the same height, so they are in contact with the inner bottom surface 13 of the housing 10, thereby ensuring the insulation distance between the inner bottom surface 13 of the housing 10 and the resistance wire 22. Therefore, it is possible to use components such as insulation parts (such as mica plates) without the need for insulation parts.

[0104] The housing 10 is a box-shaped structure made of a metallic material (such as aluminum) or a ceramic material. The housing 10 includes an inner bottom surface 13 and multiple inner sidewalls constituting the box-shaped structure, which together define the receiving space of the housing 10. The resistor 20, the first connection terminal 23, the second connection terminal 24, and a portion of a pair of external terminals 40 can be located within this receiving space. (Please refer to...) Figure 2 and Figure 5The resistor 20, the first connecting terminal 23, the second connecting terminal 24, and a pair of external terminals 40 can be integrated into a whole and placed into the housing 10's accommodating space. A sealing material (such as cement or resin) is injected into the accommodating space. The sealing material flows between the components inside the housing 10 and, after curing, can serve as insulation and fixation.

[0105] External terminals 40 typically appear in pairs, such as Figure 12 As shown, a portion of each of the two external terminals 40 is located inside the housing 10, while the other portion protrudes outside the housing 10 along its height. The external terminals 40 located inside the housing 10 are respectively connected to the corresponding first connection terminal 23 and second connection terminal 24 inside the housing 10, and the external terminals 40 can serve as interfaces for connecting to external devices.

[0106] The first connecting terminal 23, the second connecting terminal 24, and the external terminal 40 are all made of stainless steel.

[0107] like Figure 13 As shown, the inner wall of the housing 10 includes the length direction of the housing 10 (e.g., Figure 13 The first inner sidewall 11 and the second inner sidewall 12 are arranged opposite each other in the X-axis direction (as shown) and in the width direction of the housing 10 (e.g., Figure 13 The third inner wall 15 and the fourth inner wall 16 are arranged opposite each other in the Y-axis direction (as shown). The first inner wall 11 and the second inner wall 12 can be symmetrically arranged about the center line of the Y-axis direction of the housing 10, and the third inner wall 15 and the fourth inner wall 16 can be symmetrically arranged about the center line of the X-axis direction of the housing 10.

[0108] like Figure 13 and Figure 14a As shown, two protrusions 14 protruding from the inner bottom surface 13 of the housing 10 are respectively provided. For example, the protrusions 14 can be located near the first inner sidewall 11 and near the second inner sidewall 12 respectively, and the protrusions 14 extend between the third inner sidewall 15 and the fourth inner sidewall 16 respectively.

[0109] Each protrusion 14 has multiple recesses 143 formed thereon, such as Figure 17b As shown ( Figure 17b The resistor 20 (not shown, including the first connecting terminal 23, the second connecting terminal 24, and the resistance wire 22) has recesses 143 that can accommodate the bottom end of the corresponding resistor 20 (plate-shaped core 21). The recesses 143 can restrict the movement of the resistor 20 in the Y-axis direction; in addition, the first inner sidewall 11 and the second inner sidewall 12 can restrict the movement of the resistor 20 (plate-shaped core 21) in the X-axis direction. Figure 17bThe first connection terminal 23 and the second connection terminal 24 and the resistance wire 22 on the resistor body 20 are not shown.

[0110] As described above, the middle portion of the plate-shaped core material 21 is a winding portion 211, on which resistance wire 22 is wound. Understandably, the bottom end of the first end 212 (second end 213) of the plate-shaped core material 21 is accommodated in the recess 143. Alternatively, the first protrusion 201 (second protrusion 202) of the plate-shaped core material 21 can be accommodated in the recess 143.

[0111] Understandably, the recesses 143 constructed on the protrusion 14 divide the protrusion 14 into multiple parts, which can be integrally formed or in a split-structure form.

[0112] The number of recesses 143 on each protrusion 14 is the same as the number of resistors 20, that is, each recess 143 on each protrusion 14 is used to accommodate the bottom end of the corresponding resistor 20. For example Figure 13 An example of three resistors 20 is shown, and correspondingly, three recesses 143 are provided on each protrusion 14. For ease of explanation, the recesses 143 on each protrusion 14 are referred to as the first recess 1431, the second recess 1432, and the third recess 1433, respectively. Figure 17b As shown, the first recess 1431 is the recess closest to the fourth inner wall 16, the third recess 1433 is the recess closest to the third inner wall 15, and the second recess 1432 is located between the first recess 1431 and the third recess 1433.

[0113] Understandably, when there are more resistors 20, the number of recesses 143 on each protrusion 14 also increases. For example, multiple second recesses 1432 can be provided between the first recess 1431 and the third recess 1433 to support the corresponding resistors 20 respectively.

[0114] By accommodating each resistor 20 in a corresponding recess 143, the stability of the housing 10 support can be improved, and the resistor 20 can be prevented from shifting due to the impact of the sealing material when the sealing material is poured in.

[0115] like Figure 17a As shown, a plurality of recesses 143 are spaced apart along the width direction (i.e., the Y-axis direction) of the housing 10, wherein the depth of each recess 143 is arranged in an alternating manner according to a first depth and a second depth in the width direction of the housing 10.

[0116] Taking the three recesses 143 as an example, such as Figure 17a and Figure 17bAs shown, the depth of the first recess 143, which is closest to the fourth inner wall 16, is set as the first depth d1; the depth of the second recess 1432, which is adjacent to the first recess 1431 and located in the middle, is set as the second depth d2; the depth of the third recess 143, which is adjacent to the second recess 1432, is set as the first depth d1, where d2 < d1.

[0117] Similarly, if there are two recesses 143, the depth of the recess 143 closest to the fourth inner wall 16 is set to a first depth d1, and the depth of the recess 143 adjacent to it is set to a second depth d2, and d2 < d1.

[0118] If there are four (or more) recesses 143, the depth of the recess 143 closest to the fourth inner wall 16 is set to a first depth d1, the depth of the adjacent recess 143 is set to a second depth d2, the depth of the next adjacent recess 143 is set to the first depth d1, and the depth of the next adjacent recess 143 is set to the second depth d2, where d2 < d1. That is, the depth of each recess 143 is set from the fourth inner wall 16 along the width direction of the shell 10 in an alternating manner of first depth d1 and second depth d2, so that the depth of each recess 143 presents an alternating deep-shallow-deep-shallow pattern.

[0119] Specifically, the difference between the first depth d1 and the second depth d2 (d1 - d2) is related to the plate thickness l of the first connecting terminal 23 and the second connecting terminal 24. For example, the aforementioned depth difference (d1 - d2) is equal to the plate thickness l of the first connecting terminal 23 and the second connecting terminal 24, i.e., (d1 - d2) = l. Therefore, it can be understood that after the resistor 20 is inserted into the corresponding recess 143, the resistor 20 located in the middle position will be higher than the resistor 20 closer to the inner wall of the housing 10 by the plate thickness l of the first connecting terminal 23 and the second connecting terminal 24. By adopting this arrangement, after the resistor 20 is placed in the corresponding recess 143, the resistor 20 located in the middle position will be higher than the resistor 20 closer to the inner wall of the housing 10. Therefore, the first connecting terminal 23 and the second connecting terminal 24 on the resistor 20 can be soldered without bending them, thereby simplifying the production process and improving production efficiency.

[0120] Furthermore, although the recess 143 accommodates the bottom end of the resistor 20, the bottom end (bottom surface) of the resistor 20 (plate-shaped core material 21) does not contact the bottom surface of the recess 143. There is a certain gap between the two to ensure a safe insulating distance between the resistor 20 and the inner bottom surface 13 of the housing 10.

[0121] By providing the recess 143, the first protrusion 201 and the second protrusion 202 described in the above embodiments can avoid contacting the inner bottom surface 13 of the housing 10 (e.g., Figure 15 (As shown), it only serves to prevent the resistor wire 22 from becoming loose and to position the first connecting terminal 23 and the second connecting terminal 24.

[0122] The two sides (sidewalls) of the resistor 20 can contact the inner side of the corresponding recess 143 respectively, that is, the width of the recess 143 can be the same as the width of the plate core 21; or the width of the recess 143 is slightly larger than the width of the plate core 21, that is, the two sides (sidewalls) of the resistor 20 can not contact the inner side of the corresponding recess 143 respectively, which can restrict the movement of the resistor 20 and facilitate the insertion of the resistor 20.

[0123] It should be noted that the depth mentioned above refers to the dimension along the Z-axis in each of the attached figures, while the width (thickness) refers to the dimension along the Y-axis in each of the attached figures.

[0124] In some alternative embodiments, the bottom end of the resistor 20 is kept from contacting the bottom surface of the recess 143 by providing a pedestal 19 on the inner bottom surface 13 of the housing 10.

[0125] like Figure 15 and Figure 16 As shown, the bases 19 are located at both ends of the inner bottom surface 13 of the housing 10, and as... Figure 13 As shown, the pedestals 19 at both ends of the housing 10 extend between the third inner wall 15 and the fourth inner wall 16 of the housing 10, respectively. The pedestals 19 at both ends of the housing 10 are located between the first inner wall 11 facing the protrusion 14 and the protrusion 14, and between the second inner wall 12 facing the protrusion 14 and the protrusion 14, respectively.

[0126] The base 19 is higher than the bottom surface of each recess 143. Therefore, when the resistor 20 is inserted into the corresponding recess 143, the bottom end of the plate-shaped core material 21 can contact the base 19, thus maintaining a certain distance between the bottom end of the plate-shaped core material 21 and the bottom surface of each recess 143. In other words, because the base 19 provides support for the bottom (bottom end) of the plate-shaped core material 21 from below, the plate-shaped core material 21 is not directly inserted into the bottommost part of the recess 143 when inserted, ensuring a safe insulating distance between the resistor 20 and the bottom surface of the recess 143 and the inner bottom surface 13 of the housing 10.

[0127] Therefore, it is understandable that by providing a base 19 in the housing 10, in the above-described embodiment 2, only the one on the upper side of the plate-shaped core material 21 can be retained for the pair of third protrusions 203, and only the one on the upper side of the plate-shaped core material 21 can be retained for the pair of fourth protrusions 204, so as to ensure their function in determining the position of the first connecting terminal 23 and the second connecting terminal 24. Figure 16 As shown, the one on the lower side of the plate-shaped core material 21 in the pair of third protrusions 203 and the one on the lower side of the plate-shaped core material 21 in the pair of fourth protrusions 204 can be omitted, so that the bottom end of the plate-shaped core material 21 can contact the base 19 to achieve the above-mentioned function of the base 19.

[0128] The pedestals 19 at both ends of the housing 10 can respectively abut against the first inner sidewall 11 and the second inner sidewall 12 of the housing 10, such as Figure 13 As shown. Alternatively, the pedestals 19 at both ends of the housing 10 may also have a certain distance between them and the first inner sidewall 11 and the second inner sidewall 12.

[0129] Furthermore, as described above, the first recess 1431 and the third recess 1433 located on both sides are the deepest, while the second recess 1432 located in the middle is the shallowest, so that after the resistor 20 is inserted into the corresponding recess 143, the resistor 20 in the middle position is higher. To accommodate this, as... Figure 14b As shown, a boss 191 is provided on the base 19 at a position corresponding to the recess 143 located in the middle position. The boss 191 can support the bottom end of the resistor 20 located in the middle position, so that it is higher than the other resistors 20.

[0130] Figure 14b An example of a recess 143 capable of accommodating three resistors 20 is shown, and accordingly, a boss 191 is provided to support the bottom end of the resistor 20 located within the shallowest recess 143 (second depth d2). It can be understood that if the number of resistors 20 is greater, the number of bosses 191 can be provided to support the bottom ends of multiple resistors 20 located within the shallowest recess 143 (second depth d2) respectively.

[0131] In some optional or additional embodiments, the bottom end of the resistor 20 is prevented from contacting the bottom surface of the recess 143 by providing a rounded corner structure at the transition between the bottom surface and the side surface of the recess 143.

[0132] like Figure 18 and Figure 19As shown, the bottom surface of each recess 143 has a rounded corner structure. Therefore, when the plate-shaped core material 21 is inserted into the corresponding recess 143, the plate-shaped core material 21 is blocked by the rounded corner structure and cannot be directly inserted to the bottom of the corresponding recess 143. This ensures that there is a certain distance between the bottom end of the plate-shaped core material 21 and the bottom surface of the recess 143, so as to ensure a safe insulation distance between it and the inner bottom surface 13 of the housing 10.

[0133] Furthermore, since the rounded corner structure of the recess 143 ensures that the bottom end of the plate-shaped core material 21 does not contact the bottom surface of the recess 143, the aforementioned pedestal 19 may not be required.

[0134] In addition, in order to facilitate the insertion of the plate-shaped core material 21 into the corresponding recess 143, a guide portion 144 is provided at the upper end of the recess 143. The guide portion 144 may be, for example, a sloped surface inclined toward the interior of the recess 143, so as to facilitate the smooth insertion of the plate-shaped core material 21 into the corresponding recess 143.

[0135] For ease of connection, the external terminal 40 can be configured as an L-shaped structure, with one part connected to the solder tabs 26 of the corresponding first connecting terminal 23 and second connecting terminal 24, and the other part protruding outside the housing 10 along its height direction for easy connection to external devices. Similarly, when connecting the external terminal 40 to the solder tabs 26 of the corresponding first connecting terminal 23 and second connecting terminal 24, a portion of the two can be overlapped and soldered to ensure connection stability.

[0136] A spacer wall 18 may also be provided in the housing 10. For example... Figure 14b As shown, the spacer wall 18 can extend along the length of the housing 10 between the two protrusions 14, thereby separating two adjacent resistors 20. The spacer wall 18 can be made of metal and can be integrally formed with the housing 10, or connected to the housing 10 by welding, bonding or other means.

[0137] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A resistive element, characterized in that, include: The core material is a rectangular plate structure with resistance wires wound around it. The first connection terminal is electrically connected to the starting end of the resistance wire; as well as The second connection terminal is electrically connected to the end of the resistor wire; The plate-shaped core material has a pair of first protrusions and a pair of second protrusions at its two ends along its long side; the first connecting terminal is located on the side of the first protrusion away from the second protrusion, the second connecting terminal is located on the side of the second protrusion away from the first protrusion, and the resistance wire is located between the first protrusion and the second protrusion.

2. The resistive element according to claim 1, characterized in that, Both the first protrusion and the second protrusion protrude along the short side of the plate-shaped core material, and the protrusion heights of the first protrusion and the second protrusion are the same.

3. The resistive element according to claim 1 or 2, characterized in that, The first protrusion and the second protrusion are respectively attached near the start and end of the resistance wire.

4. The resistive element according to claim 1 or 2, characterized in that, The plate-shaped core material also has a pair of third protrusions and a pair of fourth protrusions at both ends in the long side direction. The pair of third protrusions are respectively located on the side of the first protrusion away from the second protrusion, and the pair of fourth protrusions are respectively located on the side of the second protrusion away from the first protrusion. The first connecting terminal is located between the first protrusion and the corresponding third protrusion, and the second connecting terminal is located between the second protrusion and the corresponding fourth protrusion.

5. The resistive element according to claim 4, characterized in that, Each of the third protrusions is aligned with one end face of the short side of the plate-shaped core material on the outer side of the long side, and each of the fourth protrusions is aligned with the other end face of the short side of the plate-shaped core material on the outer side of the long side.

6. The resistive element according to claim 4, characterized in that, The plate-shaped core material has one or more first through holes at both ends of its long side. The first through holes penetrate the plate-shaped core material along its thickness direction. The first through holes are located between the third protrusion and the first protrusion, and between the fourth protrusion and the second protrusion. Both the first connecting terminal and the second connecting terminal are provided with one or more connecting terminal protrusions, which protrude toward the corresponding first through hole and cooperate with the corresponding first through hole.

7. The resistive element according to claim 6, characterized in that, The plate-shaped core material has a second through hole at each end of its long side. The second through hole penetrates the plate-shaped core material along its thickness direction. The second through holes are located between the third protrusion and the first protrusion, and between the fourth protrusion and the second protrusion, respectively. The first connecting terminal and the second connecting terminal respectively cover the corresponding second through hole.

8. The resistive element according to claim 7, characterized in that, When there are multiple first through holes, each first through hole is arranged sequentially around the corresponding second through hole in the circumferential direction.

9. The resistive element according to claim 7, characterized in that, The diameter of the first through hole is smaller than the diameter of the second through hole.

10. A resistor comprising the resistive element according to any one of claims 1-9, characterized in that, The resistor further includes a housing, in which one or more of the resistive elements are housed, the long side of the resistive elements being in the same direction as the long side of the housing; The resistor has a pair of external terminals, which are disposed on the resistor in such a way that a portion of the external terminals protrude from the housing, and are electrically connected to the first connection terminal and the second connection terminal, respectively.

11. The resistor according to claim 10, characterized in that, When there are multiple resistors, the first connection terminal and / or the second connection terminal are provided with welding tabs for welding with other connection terminals. By welding the welding tabs, the multiple resistors are electrically connected.

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