Welding structure of cylindrical NTC resistor

Abstract

The utility model provides a welding structure of a cylindrical NTC resistor, which comprises a first bonding pad, a second bonding pad and a concentric-square-shaped soldering lug, the first bonding pad is provided with a first gap, the second bonding pad is provided with a second gap, and the first gap and the second gap are arranged oppositely. The two ends of the concentric-square-shaped soldering lug are erected on the first bonding pad and the second bonding pad respectively, the concentric-square-shaped soldering lug is of a frame-shaped structure, and a containing opening is formed in the middle of the concentric-square-shaped soldering lug and located between the first notch and the second notch. And an NTC resistor is placed in the accommodating opening and is cylindrical. The first end face of the NTC resistor is aligned with the first notch, the second end face of the NTC resistor is aligned with the second notch, and the concentric-square-shaped soldering lug has soldering fusibility. In the welding process, the concentric-square-shaped welding piece is continuously melted, the NTC resistor falls to the area between the first notch and the second notch, and therefore the NTC resistor is welded to the first bonding pad and the second bonding pad at the same time. According to the utility model, the soldering lug is adopted as the soldering flux, soldering flux is not needed, and the soldering flux can be prevented from splashing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a semiconductor structure technical field especially relates to a cylindrical NTC resistance's welding structure. BACKGROUND

[0002] Power module generally uses NTC resistance to measure temperature, and cylindrical NTC resistance is most widely used at present because of stable quality and lower price.The welding process of the electronic components including cylindrical NTC resistance at present mainly has the following kinds:(1) 0 residual tin paste soldering.(2) solvent cleaning tin paste plus cleaning process.(3) water washing tin paste plus water washing process.(4) welding sheet + paster head shaping + reflow.(5) welding sheet + fixing glue + cylindrical NTC resistance.

[0003] But the above process is applied to the welding of cylindrical electronic components and all has certain problems, resulting in certain restrictions on application.For example,(1) 0 residual tin paste is expensive, and tin paste splashing problem is prone to occur.(2) vacuum furnace needs regular maintenance, and material and process cost are higher.(3) conventional tin paste with cleaning process has tin paste splashing problem, and the cost of solvent cleaning tin paste, cleaning agent and water washing tin paste is higher, water consumption of water washing process is larger, and energy consumption is higher.(4) paster head shaping welding sheet process, because of the existence of internal stress in the shaped welding sheet, the welding sheet is prone to fly out, resulting in low yield.(5) conventional welding sheet process, because the shape of NTC resistance is cylindrical, it is necessary to use fixing glue to fix, as shown in the drawing, and the virtual welding ratio is high after soldering due to the high expansion coefficient of glue, and the yield is low. Figure 5

[0004] Therefore, a welding structure that can reduce the virtual welding of cylindrical NTC resistance during welding, thereby improving product yield, without the need for cleaning process, thereby reducing process cost is needed. UTILITY MODEL CONTENTS

[0005] To overcome the problems in the related art, the utility model aims at providing a cylindrical NTC resistance welding structure, which can reduce the virtual welding of cylindrical NTC resistance during welding, thereby improving product yield, without the need for cleaning process, thereby reducing process cost.

[0006] ​The utility model provides a welding structure of cylindrical NTC resistance, including first soldering pad, second soldering pad and back -shaped soldering sheet, the first soldering pad is set up with first gap, the second soldering pad is set up with second gap, and the first gap and the second gap are opposite, the both ends of back -shaped soldering sheet are respectively set up on the first soldering pad and the second soldering pad, and back -shaped soldering sheet is frame structure, and the middle part of back -shaped soldering sheet is set up with accommodating mouth, and the accommodating mouth is located between the first gap and the second gap, and NTC resistance is placed in the accommodating mouth, and NTC resistance is cylindrical, the first end surface of NTC resistance is aligned with the first gap, the second end surface of NTC resistance is aligned with the second gap, and back -shaped soldering sheet has weldability.

[0007] In the preferred technical scheme of the utility model, the first end surface of the NTC resistance abuts against the first end of the accommodating mouth, and the second end surface of the NTC resistance abuts against the second end of the accommodating mouth.

[0008] In the preferred technical scheme of the utility model, the first soldering pad and the second soldering pad are both C-shaped.

[0009] In the preferred technical scheme of the utility model, the first gap comprises a first inner recessed surface, and the first end of the accommodating mouth is aligned with the first inner recessed surface.

[0010] In the preferred technical scheme of the utility model, the second gap comprises a second inner recessed surface, and the second end of the accommodating mouth is aligned with the second inner recessed surface.

[0011] In the preferred technical scheme of the utility model, the first gap further comprises a first extension surface and a second extension surface, the first extension surface and the second extension surface are parallel to each other, and the two sides of the first inner recessed surface are connected with the first extension surface and the second extension surface respectively.

[0012] In the preferred technical scheme of the utility model, the second gap further comprises a third extension surface and a fourth extension surface, the third extension surface and the fourth extension surface are parallel to each other, and the two sides of the second inner recessed surface are connected with the third extension surface and the fourth extension surface respectively.

[0013] In the preferred technical scheme of the utility model, the diameter of the first end surface of the NTC resistance is less than or equal to the length of the first inner recessed surface.

[0014] In the preferred technical scheme of the utility model, the first inner recessed surface is inclined from the side close to the accommodating mouth to the side away from the accommodating mouth, and the first extension surface and the second extension surface are inclined to form an area for collecting the melted solder of the back -shaped soldering sheet at the bottom of the first inner recessed surface.

[0015] In the preferable technical scheme of the utility model, the second inner concave surface is inclined from the side close to the containing opening to the side far from the containing opening, and the third extension surface and the fourth extension surface are inclined to form an area for collecting the solder after the U-shaped solder piece melts at the bottom of the second inner concave surface.

[0016] The utility model discloses the beneficial effect that:

[0017] The utility model provides a cylindrical NTC resistance's welding structure, including first soldering pad, second soldering pad and U-shaped solder piece, first soldering pad is set with first gap, and second soldering pad is set with second gap, and first gap and second gap are opposite to each other, the both ends of U-shaped solder piece are respectively erected on first soldering pad and second soldering pad, and U-shaped solder piece is frame structure, and the middle part of U-shaped solder piece is set with containing opening, and containing opening is between first gap and second gap, NTC resistance is placed in containing opening, and NTC resistance is cylindrical, the first end surface of NTC resistance is aligned with first gap, and the second end surface of NTC resistance is aligned with second gap, and U-shaped solder piece has weldability.In the welding before, cylindrical NTC resistance is placed into the containing opening of U-shaped solder piece, fixes NTC resistance, prevents NTC resistance from rolling and offset.The first end surface of NTC resistance that is placed in containing opening is aligned with first gap, and the second end surface is aligned with second gap.U-shaped solder piece is used as solder, and NTC resistance is welded.In the process of welding, U-shaped solder piece melts constantly, and the solder of U-shaped solder piece is formed at the both ends of NTC resistance, and NTC resistance falls to the area between first gap and second gap.The first end surface of NTC resistance is welded with first gap through solder, and the second end surface is welded with second gap through solder, so as to weld NTC resistance on first soldering pad and second soldering pad simultaneously.The utility model uses solder piece as solder, does not need flux, can prevent the flux in the solder paste from boiling when heating and causes the solder of molten state to fly, forms the splashing of solder.Due to not using flux, therefore, cleaning procedure is saved.The utility model uses U-shaped solder piece to fix NTC resistance, does not need to use glue to fix NTC resistance, can prevent the false welding produced by the expansion of glue in the welding process.In addition, solder piece is low in price, and process cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of the welding structure of the cylindrical NTC resistance of the utility model;

[0019] Figure 2 It is the structure schematic diagram of first soldering pad and second soldering pad of the utility model;

[0020] Figure 3 It is the structure schematic diagram of U-shaped solder piece of the utility model;

[0021] Figure 4is a schematic diagram of the NTC resistor of the utility model;

[0022] Figure 5 is a schematic diagram of the welding structure of the prior art NTC resistor.

[0023] Reference signs: 1, first solder pad; 2, second solder pad; 3, back-shaped solder piece; 4, first notch; 5, second notch; 6, accommodating opening; 7, NTC resistor; 8, first inner concave surface; 9, second inner concave surface; 10, first extension surface; 11, second extension surface; 12, third extension surface; 13, fourth extension surface; 14, glue; 15, solder layer; 16, ordinary solder pad. DETAILED DESCRIPTION

[0024] The preferred embodiments of the utility model will be described in more detail below with reference to the drawings. Although the preferred embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the utility model more thorough and complete, and to fully convey the scope of the utility model to those skilled in the art.

[0025] The welding structure of the prior art NTC resistor 7 is shown in Figure 5 , including an ordinary solder pad 16, a solder layer 15 and a glue 14 arranged on the ordinary solder pad 16, and the NTC resistor 7 is fixed on the ordinary solder pad 16 by using the glue 14. The solder layer 15 is located on both sides of the glue 14, and the solder layer 15 is used to weld the NTC resistor 7 on the ordinary solder pad 16.

[0026] Example 1

[0027] As shown in Figures 1-4 , the embodiment provides a welding structure of a cylindrical NTC resistor, which comprises a first solder pad 1, a second solder pad 2 and a back-shaped solder piece 3, the first solder pad 1 is provided with a first notch 4, the second solder pad 2 is provided with a second notch 5, and the first notch 4 and the second notch 5 are oppositely arranged; both ends of the back-shaped solder piece 3 are arranged on the first solder pad 1 and the second solder pad 2 respectively, the back-shaped solder piece 3 is a frame-shaped structure, the back-shaped solder piece 3 is provided with an accommodating opening 6 in the middle part, and the accommodating opening 6 is located between the first notch 4 and the second notch 5; an NTC resistor 7 is placed in the accommodating opening 6, and the NTC resistor 7 is cylindrical; a first end surface of the NTC resistor 7 is aligned with the first notch 4, a second end surface of the NTC resistor 7 is aligned with the second notch 5, and the back-shaped solder piece 3 has weldability.

[0028] The first pad 1 and the second pad 2 are oppositely arranged, the meandering soldering sheet 3 is arranged on the first pad 1 and the second pad 2, and the two sides of the meandering soldering sheet 3 are respectively abutted with the first pad 1 and the second pad 2. Before welding, the first pad 1 and the second pad 2 jointly provide upward supporting force for the meandering soldering sheet 3 to fix the meandering soldering sheet 3. The meandering soldering sheet 3 is provided with a receiving opening 6, and the receiving opening 6 is in the shape of a cuboid. The NTC resistance 7 in the shape of a cylinder is placed in the receiving opening 6.

[0029] The NTC resistance 7 is in the shape of a cylinder, and the height of the NTC resistance 7 is greater than the height of the meandering soldering sheet 3 before welding, that is, part of the NTC resistance 7 is protruded upward relative to the meandering soldering sheet 3. The two end faces and the side wall of the NTC resistance 7 are clamped in the receiving opening 6 of the meandering soldering sheet 3, the first end face of the NTC resistance 7 is located above the first gap 4, and the second end face of the NTC resistance 7 is located above the second gap 5.

[0030] The receiving opening 6 is located above the region between the first gap 4 and the second gap 5, the two sides of the receiving opening 6 are respectively aligned with the edges of the first gap 4 and the second gap 5, and the distance between the first gap 4 and the second gap 5 is less than the length of the meandering soldering sheet 3.

[0031] Since the meandering soldering sheet 3 is made of fusible solder, the meandering soldering sheet 3 is continuously melted during welding, and the solder formed by melting is attached to the two end faces of the NTC resistance 7, and at the same time, the NTC resistance 7 falls until the NTC resistance 7 falls to the region between the first gap 4 and the second gap 5. The solder formed by melting of the meandering soldering sheet 3 is gathered between the first end face of the NTC resistance 7 and the first pad 1 and between the second end face of the NTC resistance 7 and the second pad 2, thereby welding the first end face of the NTC resistance 7 to the first pad 1 and welding the second end face of the NTC resistance 7 to the second pad 2.

[0032] Since the first end face of the NTC resistance 7 is aligned with the first gap 4 and the second end face of the NTC resistance 7 is aligned with the second gap 5, the NTC resistance 7 can be prevented from rolling and deviating during welding.

[0033] One of the existing processes is to paste the NTC resistance 7 on the tin paste by printing tin paste, and then reflow soldering. The soldering flux will be left around the solder joint after the tin paste reflows, and the soldering flux needs to be removed through a cleaning process. There is only one type of 0 residual tin paste on the market that does not need to be cleaned, and there is no soldering flux after soldering, but it is expensive and needs to be frequently maintained in the formic acid reflow furnace equipment, which will increase the equipment maintenance cost. The meandering soldering sheet 3 is used as solder in the utility model, and no soldering flux is needed, so the cleaning process is saved. In addition, the soldering sheet is cheap, which reduces the process cost.

[0034] The embodiment provides a welding structure of a cylindrical NTC resistance, which comprises a first soldering pad 1, a second soldering pad 2 and a back-shaped soldering sheet 3, the first soldering pad 1 is provided with a first gap 4, the second soldering pad 2 is provided with a second gap 5, and the first gap 4 and the second gap 5 are oppositely arranged; the two ends of the back-shaped soldering sheet 3 are respectively arranged on the first soldering pad 1 and the second soldering pad 2, the back-shaped soldering sheet 3 is a frame-shaped structure, a containing opening 6 is arranged in the middle of the back-shaped soldering sheet 3, and the containing opening 6 is located between the first gap 4 and the second gap 5; an NTC resistance 7 is arranged in the containing opening 6, and the NTC resistance 7 is cylindrical; a first end surface of the NTC resistance 7 is aligned with the first gap 4, a second end surface of the NTC resistance 7 is aligned with the second gap 5, and the back-shaped soldering sheet 3 has soldering fusibility. Before welding, the cylindrical NTC resistance 7 is arranged in the containing opening 6 of the back-shaped soldering sheet 3, the NTC resistance 7 is fixed, and rolling and deviation of the NTC resistance 7 are prevented. The first end surface of the NTC resistance 7 arranged in the containing opening 6 is aligned with the first gap 4, and the second end surface is aligned with the second gap 5. The back-shaped soldering sheet 3 is used as solder, and the NTC resistance 7 is welded. In the welding process, the back-shaped soldering sheet 3 is continuously melted, solder is formed at the two ends of the NTC resistance 7, and the NTC resistance 7 falls to the region between the first gap 4 and the second gap 5. The first end of the NTC resistance 7 is welded to the first gap 4 through solder, and the second end is welded to the second gap 5 through solder, so that the NTC resistance 7 is simultaneously welded to the first soldering pad 1 and the second soldering pad 2. The soldering sheet is used as solder in the utility model, and flux is not needed, so that the flux in the solder paste can be prevented from boiling when heated during welding, the solder in a molten state is prevented from flying, and solder splashing is prevented. Since the flux is not used, a cleaning process is omitted. The back-shaped soldering sheet 3 is used to fix the NTC resistance 7 in the utility model, the NTC resistance 7 is not fixed by using glue 14, and false welding caused by expansion of the glue 14 during welding is prevented. In addition, the soldering sheet is low in price, and process cost is reduced.

[0035] Embodiment 2

[0036] As Figures 1-4As shown, the embodiment provides a welding structure of a cylindrical NTC resistor, which comprises a first soldering pad 1, a second soldering pad 2 and a U-shaped soldering sheet 3, the first soldering pad 1 is provided with a first notch 4, the second soldering pad 2 is provided with a second notch 5, and the first notch 4 and the second notch 5 are oppositely arranged; the two ends of the U-shaped soldering sheet 3 are respectively arranged on the first soldering pad 1 and the second soldering pad 2, the U-shaped soldering sheet 3 is a frame structure, the middle part of the U-shaped soldering sheet 3 is provided with a receiving opening 6, and the receiving opening 6 is located between the first notch 4 and the second notch 5; an NTC resistor 7 is placed in the receiving opening 6, and the NTC resistor 7 is cylindrical; the first end surface of the NTC resistor 7 is aligned with the first notch 4, the second end surface of the NTC resistor 7 is aligned with the second notch 5, and the U-shaped soldering sheet 3 has a soldering fusibility.

[0037] The first end surface of the NTC resistor 7 abuts against the first end of the receiving opening 6, and the second end surface of the NTC resistor 7 abuts against the second end of the receiving opening 6.

[0038] The NTC resistor 7 is cylindrical, the first end surface, the second end surface and the side wall of the NTC resistor 7 all abut against the inner wall of the receiving opening 6, and the extension direction of the NTC resistor 7 is the same as the length direction of the receiving opening 6. The NTC resistor 7 is placed in the receiving opening 6, and is fixed under the clamping action of the first end and the second end of the receiving opening 6, so as to prevent the NTC resistor 7 from rolling and deviating.

[0039] The shapes of the first soldering pad 1 and the second soldering pad 2 are both C-shaped, the first soldering pad 1 and the second soldering pad 2 are oppositely arranged, and the structures of the first soldering pad 1 and the second soldering pad 2 are the same. The U-shaped soldering sheet 3 is a structure in which a cuboid receiving opening 6 is arranged in the middle part, the receiving opening 6 is located above the first notch 4 and the second notch 5, the first end of the receiving opening 6 is matched with the first notch 4, and the second end of the receiving opening 6 is matched with the second notch 5.

[0040] Before welding, the first soldering pad 1 and the second soldering pad 2 are first made, then the U-shaped soldering sheet 3 is pasted on the surfaces of the first soldering pad 1 and the second soldering pad 2 by using a pasting process, and finally the NTC resistor 7 is placed in the receiving opening 6 in the middle of the U-shaped soldering sheet 3.

[0041] Preferably, green oil is coated on the first soldering pad 1 and the second soldering pad 2, and the green oil has a solder resist effect. During reflow welding, the first soldering pad 1, the second soldering pad 2 and the U-shaped soldering sheet 3 cooperate with each other, the U-shaped soldering sheet 3 gradually melts, the melted solder is adhered between the first end surface of the NTC resistor 7 and the first notch 4 and between the second end surface of the NTC resistor 7 and the second notch 5, so that the first end surface of the NTC resistor 7 is welded with the first soldering pad 1, and the second end surface of the NTC resistor 7 is welded with the second soldering pad 2. Under the action of the green oil, tin overflow does not occur, and the welding precision is high.

[0042] The first pad 1 and the second pad 2 are pre-fabricated on top of the ceramic substrate using an etching process. The first pad 1 and the second pad 2 are C-shaped. Due to gravity, excess solder accumulates in the C-shaped recesses of the first pad 1 and the second pad 2. The C-shaped structure of the first pad 1 and the second pad 2 has the advantages of higher solder climb height, larger soldering area, stronger solder joints, and higher reliability.

[0043] In this embodiment, the first end face of the NTC resistor 7 abuts against the first end of the receiving port 6, and the second end face of the NTC resistor 7 abuts against the second end of the receiving port 6. Both the first pad 1 and the second pad 2 are C-shaped. Due to gravity, excess solder accumulates in the C-shaped recesses of the first pad 1 and the second pad 2. The C-shaped structure of the first pad 1 and the second pad 2 offers advantages such as higher solder creep height, larger soldering area, stronger solder joints, and higher reliability.

[0044] Example 3

[0045] like Figures 1-4 As shown, this embodiment provides a welding structure for a cylindrical NTC resistor, including a first pad 1, a second pad 2, and a U-shaped solder piece 3. The first pad 1 has a first notch 4, and the second pad 2 has a second notch 5, with the first notch 4 and the second notch 5 facing each other. The two ends of the U-shaped solder piece 3 are respectively mounted on the first pad 1 and the second pad 2. The U-shaped solder piece 3 has a frame-like structure, and a receiving opening 6 is provided in the middle of the U-shaped solder piece 3, which is located between the first notch 4 and the second notch 5. An NTC resistor 7 is placed in the receiving opening 6, and the NTC resistor 7 is cylindrical. The first end face of the NTC resistor 7 is aligned with the first notch 4, and the second end face of the NTC resistor 7 is aligned with the second notch 5. The U-shaped solder piece 3 has weldability.

[0046] The first notch 4 includes a first concave surface 8, and the first end of the receiving opening 6 is aligned with the first concave surface 8.

[0047] The second notch 5 includes a second concave surface 9, and the second end of the receiving opening 6 is aligned with the second concave surface 9.

[0048] The first notch 4 also includes a first extension surface 10 and a second extension surface 11, the first extension surface 10 and the second extension surface 11 are parallel to each other, and the two sides of the first concave surface 8 are respectively connected to the first extension surface 10 and the second extension surface 11.

[0049] The second notch 5 further comprises a third extending surface 12 and a fourth extending surface 13, which are parallel to each other, and the second inner concave surface 9 is connected to the third extending surface 12 and the fourth extending surface 13 respectively.

[0050] The first notch 4 and the second notch 5 are oppositely arranged, and the first inner concave surface 8 of the first notch 4 is aligned with the second inner concave surface 9 of the second notch 5. The first end of the accommodating opening 6 is located above the first inner concave surface 8, and the second end of the accommodating opening 6 is located above the second inner concave surface 9.

[0051] The first inner concave surface 8 is located between the first extending surface 10 and the second extending surface 11, and the second inner concave surface 9 is located between the third extending surface 12 and the fourth extending surface 13. The first extending surface 10 and the second extending surface 11 extend away from the second pad 2, and the third extending surface 12 and the fourth extending surface 13 extend away from the first pad 1. The first extending surface 10, the second extending surface 11 and the first inner concave surface 8 jointly form a C-shaped structure of the first pad 1, and the third extending surface 12, the fourth extending surface 13 and the second inner concave surface 9 jointly form a C-shaped structure of the second pad 2.

[0052] The U-shaped soldering sheet 3 is fusible, and when high-temperature reflow soldering is performed, the U-shaped soldering sheet 3 melts to form solder and adhere to the first end surface and the second end surface of the NTC resistance 7. During the melting process of the U-shaped soldering sheet 3, the NTC resistance 7 continuously falls until the NTC resistance 7 falls between the first notch 4 and the second notch 5, so as to ensure that the welding has high precision, which is beneficial to improve the design precision and the accuracy of temperature measurement.

[0053] Due to the action of gravity, the solder generated after the side of the U-shaped soldering sheet 3 close to the first notch 4 melts will gather at the first notch 4, so that the first extending surface 10, the second extending surface 11 and the first inner concave surface 8 are all adhered with solder. Similarly, the solder generated after the side of the U-shaped soldering sheet 3 close to the second notch 5 melts will gather at the second notch 5, so that the third extending surface 12, the fourth extending surface 13 and the second inner concave surface 9 are all adhered with solder.

[0054] Before high-temperature reflow soldering, the U-shaped soldering sheet 3 plays a role of fixing the cylindrical NTC resistance 7 and preventing the cylindrical NTC resistance 7 from rolling and deviating. The U-shaped soldering sheet 3 is used as solder, which does not produce flux, does not need a cleaning process, and the price of the soldering sheet is low.

[0055] Only one U-shaped soldering sheet 3 is needed for one cylindrical NTC resistance 7, and the welding of the cylindrical NTC resistance 7 and the two end pads is completed by the surface tension of the solder after the U-shaped soldering sheet 3 melts, and short circuit is prevented. The welding structure of the cylindrical NTC resistance 7 of the utility model reduces the number of patching times, improves the work efficiency, and reduces the process cost.

[0056] The diameter of the first end face of the NTC resistor 7 is less than or equal to the length of the first concave surface 8, such that after the U-shaped solder pad 3 melts, the first end face of the NTC resistor 7 can be soldered to the first notch 4, and the second end face of the NTC resistor 7 can be soldered to the second notch 5. Similarly, the diameter of the second end face of the NTC resistor 7 is less than or equal to the length of the second concave surface 9, such that after the U-shaped solder pad 3 melts, the second end face of the NTC resistor 7 can be soldered to the second notch 5.

[0057] In this embodiment, the first notch 4 further includes a first extending surface 10 and a second extending surface 11, which are parallel to each other. The two sides of the first concave surface 8 are connected to the first extending surface 10 and the second extending surface 11, respectively. The second notch 5 further includes a third extending surface 12 and a fourth extending surface 13, which are parallel to each other. The two sides of the second concave surface 9 are connected to the third extending surface 12 and the fourth extending surface 13, respectively. Due to gravity, the solder produced after the side of the U-shaped solder sheet 3 near the first notch 4 melts will accumulate at the first notch 4, causing solder to adhere to the first extending surface 10, the second extending surface 11, and the first concave surface 8. Similarly, the solder produced after the side of the U-shaped solder sheet 3 near the second notch 5 melts will accumulate at the second notch 5, causing solder to adhere to the third extending surface 12, the fourth extending surface 13, and the second concave surface 9.

[0058] Example 4

[0059] like Figures 1-4 As shown, this embodiment provides a welding structure for a cylindrical NTC resistor, including a first pad 1, a second pad 2, and a U-shaped solder piece 3. The first pad 1 has a first notch 4, and the second pad 2 has a second notch 5, with the first notch 4 and the second notch 5 facing each other. The two ends of the U-shaped solder piece 3 are respectively mounted on the first pad 1 and the second pad 2. The U-shaped solder piece 3 has a frame-like structure, and a receiving opening 6 is provided in the middle of the U-shaped solder piece 3, which is located between the first notch 4 and the second notch 5. An NTC resistor 7 is placed in the receiving opening 6, and the NTC resistor 7 is cylindrical. The first end face of the NTC resistor 7 is aligned with the first notch 4, and the second end face of the NTC resistor 7 is aligned with the second notch 5. The U-shaped solder piece 3 has weldability.

[0060] The first end face of the NTC resistor 7 abuts against the first end of the receiving port 6, and the second end face of the NTC resistor 7 abuts against the second end of the receiving port 6.

[0061] The first notch 4 comprises a first inner concave surface 8, and a first end of the accommodating opening 6 is aligned with the first inner concave surface 8.

[0062] The second notch 5 comprises a second inner concave surface 9, and a second end of the accommodating opening 6 is aligned with the second inner concave surface 9.

[0063] The first notch 4 further comprises a first extension surface 10 and a second extension surface 11, the first extension surface 10 and the second extension surface 11 are parallel to each other, and two sides of the first inner concave surface 8 are connected with the first extension surface 10 and the second extension surface 11 respectively.

[0064] The second notch 5 further comprises a third extension surface 12 and a fourth extension surface 13, the third extension surface 12 and the fourth extension surface 13 are parallel to each other, and two sides of the second inner concave surface 9 are connected with the third extension surface 12 and the fourth extension surface 13 respectively.

[0065] The first inner concave surface 8 is inclined from a side close to the accommodating opening 6 to a side away from the accommodating opening 6, and the first extension surface 10 and the second extension surface 11 are inclined from top to bottom to form an area for collecting the solder after the U-shaped solder piece 3 is melted at the bottom of the first inner concave surface 8.

[0066] The second inner concave surface 9 is inclined from a side close to the accommodating opening 6 to a side away from the accommodating opening 6, and the third extension surface 12 and the fourth extension surface 13 are inclined from top to bottom to form an area for collecting the solder after the U-shaped solder piece 3 is melted at the bottom of the second inner concave surface 9.

[0067] The U-shaped solder piece 3 is located above the first pad 1 and the second pad 2, the first inner concave surface 8 of the first notch 4 is inclined from top to bottom, and the second inner concave surface 9 of the second notch 5 is inclined from top to bottom. The first extension surface 10 can form an acute angle or an obtuse angle with the bottom surface of the first pad 1. The second extension surface 11 forms the same angle with the bottom surface of the first pad 1 as the first extension surface 10. The third extension surface 12 can form an acute angle or an obtuse angle with the bottom surface of the second pad 2. The fourth extension surface 13 forms the same angle with the bottom surface of the second pad 2 as the third extension surface 12. In this embodiment, the first extension surface 10 forms an acute angle with the bottom surface of the first pad 1, and the third extension surface 12 forms an acute angle with the bottom surface of the second pad 2, so that the solder formed after the U-shaped solder piece 3 is melted is more easily collected at the first notch 4 and the second notch 5.

[0068] The inclination angles of the first inner concave surface 8, the first extension surface 10 and the second extension surface 11 can be the same or different, to adjust the speed of the solder accumulated on the first inner concave surface 8, the first extension surface 10 and the second extension surface 11. The inclination angles of the second inner concave surface 9, the third extension surface 12 and the fourth extension surface 13 can be the same or different, to adjust the speed of the solder accumulated on the second inner concave surface 9, the third extension surface 12 and the fourth extension surface 13. The inclination angles of the first inner concave surface 8 and the second inner concave surface 9 can be the same or different.

[0069] Since the shape of the NTC resistor 7 is cylindrical, the inclination angles of the first inner concave surface 8 and the second inner concave surface 9 are both set to 30 degrees, i.e. the angle between the first inner concave surface 8 and the bottom surface of the first pad 1 is 30 degrees, and the angle between the second inner concave surface 9 and the bottom surface of the second pad 2 is also 30 degrees. The angle between the first extension surface 10 and the first inner concave surface 8 is 15 degrees, and the angle between the second extension surface 11 and the first inner concave surface 8 is also 15 degrees. The angle between the third extension surface 12 and the second inner concave surface 9 is 15 degrees, and the angle between the fourth extension surface 13 and the second inner concave surface 9 is also 15 degrees.

[0070] The first inner concave surface 8 of the present embodiment is inclined from the side close to the accommodating opening 6 to the side away from the accommodating opening 6, and the first extension surface 10 and the second extension surface 11 are inclined to form a region to collect the solder after the melting of the U-shaped solder piece 3 at the bottom of the first inner concave surface 8. The second inner concave surface 9 is inclined from the side close to the accommodating opening 6 to the side away from the accommodating opening 6, and the third extension surface 12 and the fourth extension surface 13 are inclined to form a region to collect the solder after the melting of the U-shaped solder piece 3 at the bottom of the second inner concave surface 9. The inclination angles of the first inner concave surface 8, the first extension surface 10, the second extension surface 11, the second inner concave surface 9, the third extension surface 12 and the fourth extension surface 13 are set according to the model of the NTC resistor 7 and the size of the U-shaped solder piece 3, so that the solder formed after the melting of the U-shaped solder piece 3 can be distributed more quickly and uniformly in the three-dimensional space corresponding to the first gap 4 and the second gap 5, and on the two end surfaces of the NTC resistor 7, thereby improving the welding efficiency and the yield of finished products.

[0071] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the various embodiments are not meant to limit the scope of the present application unless otherwise specifically stated. In all of the examples shown and discussed herein, any particular value should be interpreted in the context of the specific application and should not be considered as a limitation on the overall application. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like numbers and letters refer to like items throughout the several views of the drawings, and that further discussion of any item need not be repeated in subsequent views.

[0072] It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over, then a

[0073] In addition, it should be noted that the use of "first", "second", and the like words of resemblance to define parts, only for the convenience of the corresponding parts are distinguished, as no other declaration, the above words have no special meaning, therefore can not be understood as limiting the scope of protection of the present application.

[0074] The above only the preferred embodiments of the present application, and is not intended to limit the present application, for those skilled in the art, the present application can be various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A welded structure of a cylindrical NTC resistor, characterized by, The first pad, the second pad and the U-shaped soldering sheet are provided, the first pad is provided with a first notch, the second pad is provided with a second notch, and the first notch and the second notch are oppositely arranged; two ends of the U-shaped soldering sheet are arranged on the first pad and the second pad respectively, the U-shaped soldering sheet is a frame structure, a middle part of the U-shaped soldering sheet is provided with a receiving opening, and the receiving opening is located between the first notch and the second notch; an NTC resistor is placed in the receiving opening, and the NTC resistor is cylindrical; a first end surface of the NTC resistor is aligned with the first notch, a second end surface of the NTC resistor is aligned with the second notch, and the U-shaped soldering sheet has soldering fusibility.

2. The welded structure of a cylindrical NTC resistor according to claim 1, wherein The first end surface of the NTC resistor abuts against a first end of the receiving opening, and the second end surface of the NTC resistor abuts against a second end of the receiving opening.

3. The welded structure of a cylindrical NTC resistor according to claim 1, wherein The first pad and the second pad are both C-shaped.

4. The welded structure of a cylindrical NTC resistor according to claim 2, wherein The first notch comprises a first inner concave surface, and the first end of the receiving opening is aligned with the first inner concave surface.

5. The welded structure of a cylindrical NTC resistor according to claim 2, wherein The second notch comprises a second inner concave surface, and the second end of the receiving opening is aligned with the second inner concave surface.

6. The welded structure of a cylindrical NTC resistor according to claim 4, wherein The first notch further comprises a first extension surface and a second extension surface, the first extension surface and the second extension surface are parallel to each other, and two sides of the first inner concave surface are connected with the first extension surface and the second extension surface respectively.

7. The solder structure of a cylindrical NTC resistor according to claim 5, wherein The second notch further comprises a third extension surface and a fourth extension surface, the third extension surface and the fourth extension surface are parallel to each other, and two sides of the second inner concave surface are connected with the third extension surface and the fourth extension surface respectively.

8. The welded structure of a cylindrical NTC resistor according to claim 4, wherein The diameter of the first end surface of the NTC resistor is less than or equal to the length of the first inner concave surface.

9. The solder structure of a cylindrical NTC resistor according to claim 6, wherein The first inner concave surface is inclined from a side close to the receiving opening to a side away from the receiving opening, and the first extension surface and the second extension surface are inclined to form an area for collecting the melted solder of the U-shaped soldering sheet at the bottom of the first inner concave surface.

10. The solder structure of a cylindrical NTC resistor according to claim 7, wherein The second inner concave surface is inclined from a side close to the receiving opening to a side away from the receiving opening, and the third extension surface and the fourth extension surface are inclined to form an area for collecting the melted solder of the U-shaped soldering sheet at the bottom of the second inner concave surface.

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