A snap type electromagnetic relay with a circuit board

Abstract

The application discloses a clapping type electromagnetic relay with a circuit board, which comprises a shell, a base, a magnetic circuit part and a static spring part. The static spring part comprises two static spring sheets for realizing current inflow and outflow. The magnetic circuit part and the static spring part are respectively arranged on the base, and the leading-out pin of the static spring part extends out of the lower surface of the base. The shell is covered on the base from top to bottom, and the contact part in the magnetic circuit part and the static spring part is accommodated in the space surrounded by the shell and the base. The base is also accommodated in the cover opening of the shell. The relay further comprises a PCB board. The PCB board is electrically connected with the coil leading-out of the magnetic circuit part and the two static spring sheets respectively. The application uses one PCB board to replace multiple parts, so that the number of parts is reduced, the cost is lowered, the assembly process is simplified, and the reliability of the whole relay system is ensured due to the maturity of the tin soldering process of the PCB board.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a snap-action electromagnetic relay with a circuit board. Background Technology

[0002] In high-current relays, in addition to the necessary coil leads, features such as contact signal monitoring and internal temperature monitoring are required. Parallel resistors and diodes may also be needed across the coil. These requirements result in a large number of relay parts, a complex structure, and reduced overall system reliability. Contact signal detection and the mating of external connectors with coil terminals require at least four signals (two spring leads and two coils). These signals need to be transmitted from their respective positions to at least four pins of the connector, arranged in a straight line with a certain spacing. The common approach is to use at least four conductive elements for transmission, which may require multiple bends (due to different signal source locations), further complicating the component structure. The beginning and end of the conductive elements also need to be electrically connected to the signal source and the connector pins, potentially using snap-fit ​​and soldering methods, further complicating the component structure and assembly process. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a snap-fit ​​electromagnetic relay with a circuit board. By mounting a PCB board on the outside of the base, on the one hand, the number of parts used in the relay is reduced, thereby lowering the cost and simplifying the assembly process; on the other hand, placing the PCB board outside the relay prevents conductive foreign matter generated by contact erosion during normal operation from running onto the PCB board and causing a short circuit, and also prevents foreign matter that may be generated from soldering the PCB board to the leads from falling into the relay and contaminating the contacts, thus ensuring the reliability of the relay system.

[0004] The technical solution adopted by this invention to solve its technical problem is: a snap-action electromagnetic relay with a circuit board, comprising a housing, a base, a magnetic circuit part, and a stationary spring part; the stationary spring part includes two stationary spring plates for realizing current inflow and outflow; the magnetic circuit part and the stationary spring part are respectively mounted on the base, and the lead-out feet of the stationary spring part extend out of the lower surface of the base; the housing covers the base from top to bottom and accommodates the contact parts of the magnetic circuit part and the stationary spring part in the space enclosed by the housing and the base, and the base is also accommodated in the opening of the housing; the relay also includes a PCB board; the PCB board is electrically connected to the coil lead-out of the magnetic circuit part and the two stationary spring plates respectively.

[0005] Furthermore, the PCB board is mounted on the lower surface of the base and housed within the opening of the housing.

[0006] Furthermore, on the lower surface of the base, near the position where the PCB board is mounted, a connector is integrally provided; the connector is provided with several pins; the pins are inverted U-shaped, one end of which is inserted downward into the PCB board and electrically connected to the PCB board, and the other end of which is inserted downward as a lead-out pin.

[0007] Furthermore, of the two stationary springs, the lead of one stationary spring extends downward through the PCB board, and the lead of the other stationary spring extends downward from the side of the PCB board; the PCB board is provided with a first through hole for accommodating the lead of one of the stationary springs.

[0008] Furthermore, one of the lead-out feet of one of the stationary springs is provided with a downwardly protruding first protrusion on one side, and the PCB board is provided with a second through hole at the corresponding position. The first protrusion of the lead-out foot of one of the stationary springs is adapted to and fixed in the second through hole of the PCB board, so as to realize the electrical connection between the one of the stationary springs and the PCB board.

[0009] Furthermore, one side of the lead-out foot of the other stationary spring is bent toward the top of the PCB board and has a downwardly protruding second protrusion. The PCB board has a third through hole at the corresponding position. The second protrusion of the lead-out foot of the other stationary spring is adapted to and fixed in the third through hole of the PCB board, so as to realize the electrical connection between the other stationary spring and the PCB board.

[0010] Furthermore, a temperature sensor is also provided in the PCB board at a location near at least one of the two stationary springs.

[0011] Furthermore, the portion of one side of the lead-out foot of the other stationary spring that bends towards the top of the PCB board is positioned corresponding to the temperature sensor, and the portion of one side of the lead-out foot of the other stationary spring that bends towards the top of the PCB board is in close contact with the top of the PCB board.

[0012] Furthermore, epoxy resin is filled between the base and the housing opening to fix the stationary spring, base, housing and PCB board together; the epoxy resin also covers the corresponding components on the PCB board, thereby achieving the fixation and encapsulation of the relay structure.

[0013] Furthermore, the magnetic circuit section includes a coil frame; the end of the coil lead-out is provided with a slot, and is fixed by the slot to a solder pad provided in one of the flanges of the coil frame; the PCB board is provided with a fourth through hole; the coil lead-out is provided with a pin-type protrusion; the pin-type protrusion of the coil lead-out is adapted to and fixed in the fourth through hole of the PCB board, so as to realize the electrical connection between the coil lead-out of the magnetic circuit section and the PCB board.

[0014] Furthermore, hooks are provided on both sides of the other flange of the coil frame, and corresponding holes are provided in the corresponding side wall of the base. When the magnetic circuit part is installed into the base, the hooks on both sides of the other flange of the coil frame are respectively engaged in the holes of the base.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The invention incorporates a relay and a PCB board. The PCB board is mounted on the lower surface of the base and housed within the cover of the outer casing. The PCB board is electrically connected to the coil leads of the magnetic circuit and two stationary springs. This structure replaces multiple conductive components with a single PCB board (one component replaces multiple complex components), and the simple PCB board soldering process replaces snap-fit ​​and soldering, simplifying the assembly process. Furthermore, due to the maturity of the PCB board soldering process, the reliability of the entire relay system is guaranteed. The coil is electrically connected to the PCB board through coil terminals, and the parallel resistors and diodes on the coil can be directly mounted on the PCB board without additional installation or space occupation, resulting in a simple structure, simplified manufacturing process, and a more compact design. Because the PCB board is mounted on the lower surface of the base, outside the relay, conductive foreign matter generated by contact erosion during normal operation cannot reach the PCB board and cause a short circuit. Additionally, foreign matter that may be generated during soldering between the PCB board and the leads will not fall into the relay and contaminate the contacts.

[0017] 2. Due to the use of a connector integrally formed on the lower surface of the base near the mounting position of the PCB board, the connector has several pins. Each pin is inverted U-shaped, with one end inserted downwards into the PCB board and electrically connected thereto, and the other end pointing downwards as a lead. This structure of the present invention integrates the electrical connector and the base, saving parts and simplifying the assembly process.

[0018] 3. Because one of the stationary spring contacts has a downwardly protruding first protrusion on one side of its lead-out foot, and the PCB board has a second through hole at the corresponding position, the first protrusion of the lead-out foot of the one stationary spring contact is adapted to and fixed in the second through hole of the PCB board, achieving electrical connection between the one stationary spring contact and the PCB board; and because one side of the lead-out foot of the other stationary spring contact is bent towards the top of the PCB board and has a downwardly protruding second protrusion, and the PCB board has a third through hole at the corresponding position, the second protrusion of the lead-out foot of the other stationary spring contact is adapted to and fixed in the third through hole of the PCB board, achieving electrical connection between the other stationary spring contact and the PCB board. This structure of the present invention achieves electrical connection between two stationary spring contacts and the PCB board, has a simple structure, enables contact signal monitoring, and has a pre-fixing function.

[0019] 4. Because the PCB board incorporates a temperature sensor located near at least one of the two stationary springs, this structure, by detecting the temperature of the leads of the two stationary springs using the temperature sensor, can improve the lifespan of the relay and even the entire battery pack system while ensuring safety, protecting it from the fatal effects of abnormal vehicle operating conditions.

[0020] 5. By encapsulating the space between the base and the outer casing with epoxy resin, the stationary spring, base, outer casing, and PCB board are fixed together. The epoxy resin also covers the corresponding components on the PCB board, thus achieving both fixation and encapsulation of the relay structure. This structure of the present invention fixes the relay structure and encapsulates the internal components of the relay, preventing external moisture from entering. Simultaneously, the epoxy resin covers the relevant components on the PCB board, fixing and protecting each part.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the snap-action electromagnetic relay with circuit board of the present invention is not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention with the bottom flipped upwards;

[0023] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present invention with the bottom flipped upwards after the outer shell is removed;

[0024] Figure 3 This is a three-dimensional structural diagram of an embodiment of the present invention with the bottom flipped upwards after the outer shell is removed (rotated at an angle);

[0025] Figure 4 This is a three-dimensional structural diagram of an embodiment of the present invention after removing the outer shell;

[0026] Figure 5 This is a three-dimensional structural diagram of an embodiment of the present invention after removing the outer shell and the base;

[0027] Figure 6 This is a three-dimensional structural diagram of an embodiment of the present invention after removing the outer shell, base, and several pins.

[0028] Figure 7 This is a three-dimensional structural diagram of an embodiment of the present invention with the bottom flipped upward after removing the outer shell, base, and several pins;

[0029] Figure 8 This is a three-dimensional structural diagram of an embodiment of the present invention with the bottom flipped upwards after removing the outer shell, base, and several pins (flipped at an angle);

[0030] Figure 9 This is a front view of an embodiment of the present invention with the bottom flipped upwards after removing the outer shell, base, and several pins;

[0031] Figure 10 This is a top view of an embodiment of the present invention;

[0032] Figure 11 yes Figure 10 Schematic diagram of the cross section at point AA;

[0033] Figure 12 This is a top view of an embodiment of the present invention after the outer shell has been removed;

[0034] Figure 13 yes Figure 12 Schematic diagram of the cross section at BB;

[0035] Figure 14 This is a three-dimensional structural diagram of the base according to an embodiment of the present invention. Detailed Implementation

[0036] Example

[0037] See Figures 1 to 14 As shown, a snap-action electromagnetic relay with a circuit board according to the present invention includes a housing 1, a base 2, a magnetic circuit part 3, and a stationary spring part 4; the stationary spring part 4 includes two stationary spring plates 41 and 42 for realizing current inflow and outflow; the magnetic circuit part 3 and the stationary spring part 4 are respectively mounted on the base 2, and the lead-out feet of the stationary spring part 4 extend out of the lower surface of the base 2; the housing 1 covers the base 2 from top to bottom and accommodates the contact parts of the magnetic circuit part 3 and the stationary spring part 4 in the space enclosed by the housing 1 and the base 2, and the base 2 is also accommodated in the cover opening of the housing 1; the relay also includes a PCB board 5; the PCB board 5 is electrically connected to the coil lead-out 32 of the magnetic circuit part 3 and the two stationary spring plates 41 and 42 respectively.

[0038] In this embodiment, the PCB board 5 is mounted on the lower surface of the base 2 and housed within the opening of the outer casing 1.

[0039] In this embodiment, a connector 6 is integrally provided on the lower surface of the base 2 near the position where the PCB board 5 is installed; a plurality of pins 61 are provided in the connector 6; the pins 61 are inverted U-shaped, one end is inserted downward into the PCB board 5 and electrically connected to the PCB board 5, and the other end is downward as a lead-out pin.

[0040] In this embodiment, of the two stationary springs 41 and 42, the lead of the stationary spring 41 extends downward through the PCB board 5, and the lead of the stationary spring 42 extends downward from the side of the PCB board 5; the PCB board 5 is provided with a first through hole 51 for accommodating the lead of the stationary spring 41.

[0041] In this embodiment, the lead-out foot of the stationary spring 41 is provided with a downwardly protruding first protrusion 411 on one side, and the PCB board 5 is provided with a second through hole 52 at the corresponding position. The first protrusion 411 of the lead-out foot of the stationary spring 41 is adapted to and fixed in the second through hole 52 of the PCB board 5, so as to realize the electrical connection between the stationary spring 41 and the PCB board 5.

[0042] In this embodiment, one side of the lead-out foot of the stationary spring 42 is bent toward the top of the PCB board 5 and has a downwardly protruding second protrusion 421. The PCB board 5 has a third through hole 53 at the corresponding position. The second protrusion 421 of the lead-out foot of the stationary spring 42 is adapted to and fixed in the third through hole 53 of the PCB board 5, so as to realize the electrical connection between the stationary spring 42 and the PCB board 5.

[0043] In the PCB board, a temperature sensor 7 is also provided near at least one of the two stationary springs 41 and 42. In this embodiment, the temperature sensor 7 is located between the leads of the two stationary springs 41 and 42.

[0044] In this embodiment, the portion of one side of the lead-out foot of the stationary spring 42 that bends toward the top of the PCB board 5 is positioned corresponding to the temperature sensor 7, and the portion of one side of the lead-out foot of the stationary spring 42 that bends toward the top of the PCB board 5 is in close contact with the top of the PCB board 5.

[0045] In this embodiment, epoxy resin is also filled between the base 2 and the cover opening of the outer shell 1, and the stationary springs 41 and 42, the base 2, the outer shell 1 and the PCB board 5 are fixed together; the epoxy resin also covers the corresponding components on the PCB board 5, thereby realizing the fixation and encapsulation of the relay structure.

[0046] In this embodiment, the magnetic circuit part 3 includes a coil frame 31; the end of the coil lead-out 32 is provided with a slot 322, and is fixed by the slot 322 to the solder piece 313 provided in the flange 311 of the coil frame; the PCB board 5 is provided with a fourth through hole 54; the coil lead-out 32 is provided with a pin-type protrusion 321; the pin-type protrusion 321 of the coil lead-out 32 is adapted to and fixed in the fourth through hole 54 of the PCB board 5, so as to realize the electrical connection between the coil lead-out 32 of the magnetic circuit part 3 and the PCB board 5.

[0047] In this embodiment, hooks 3121 are provided on both sides of the other flange 312 of the coil frame 31, and a hole 21 is provided in the corresponding side wall of the base 2. When the magnetic circuit part 3 is installed into the base 2, the hooks 3121 on both sides of the other flange 312 of the coil frame 31 are respectively engaged in the hole 21 of the base 2.

[0048] This invention discloses a snap-fit ​​electromagnetic relay with a circuit board, which further includes a PCB board 5. The PCB board 5 is mounted on the lower surface of the base 2 and housed within the cover opening of the outer casing 1. The PCB board 5 is electrically connected to the coil lead 32 of the magnetic circuit section 3 and two stationary springs 41 and 42. This structure replaces multiple conductive components with a single PCB board (one component replaces multiple complex components), and the simple PCB board soldering process replaces snap-fit ​​and soldering, simplifying the assembly process. Furthermore, due to the maturity of the PCB board soldering process, the reliability of the entire relay system is guaranteed. The coil is electrically connected to the PCB board through coil terminals, and the parallel resistors and diodes on the coil can be directly mounted on the PCB board without additional installation or space occupation, resulting in a simple structure, simplified manufacturing process, and a more compact design. Because the PCB board is mounted on the lower surface of the base, i.e., outside the relay, conductive foreign matter generated during contact erosion during normal relay operation will not reach the PCB board and cause a short circuit. Additionally, foreign matter that may be generated during soldering between the PCB board and the lead-out terminals will not fall into the relay and contaminate the contacts.

[0049] This invention discloses a snap-fit ​​electromagnetic relay with a circuit board, in which a connector 6 is integrally formed on the lower surface of the base 2 near the mounting position of the PCB board 5; the connector 6 has a plurality of pins 61; the pins 61 are inverted U-shaped, one end of which is inserted downward into the PCB board 5 and electrically connected to the PCB board 5, and the other end of which is extended downward as a lead. This structure of the present invention integrates the electrical connector and the base into a single unit, saving parts and simplifying the assembly process.

[0050] This invention discloses a snap-fit ​​electromagnetic relay with a circuit board. One of the stationary spring contacts 41 has a downwardly protruding first protrusion 411 on one side of its lead-out pin. A second through-hole 52 is provided at a corresponding position on the PCB board 5. The first protrusion 411 of the lead-out pin of one of the stationary spring contacts 41 is fitted and fixed in the second through-hole 52 of the PCB board 5, achieving electrical connection between the one stationary spring contact 41 and the PCB board 5. The other stationary spring contact 42 has a downwardly protruding second protrusion 421 on one side of its lead-out pin bent towards the top of the PCB board 5. A third through-hole 54 is provided at a corresponding position on the PCB board 5. The second protrusion 421 of the lead-out pin of the other stationary spring contact 42 is fitted and fixed in the third through-hole 53 of the PCB board 5, achieving electrical connection between the other stationary spring contact 42 and the PCB board 5. This structure of the invention achieves electrical connection between two stationary spring contacts and the PCB board. Its structure is simple, enables contact signal monitoring, and has a pre-fixing function.

[0051] This invention discloses a snap-action electromagnetic relay with a circuit board 5. The PCB board 5 includes a temperature sensor located near at least one of the two stationary springs 41 and 42. This structure, by detecting the temperature of the leads of the two stationary springs using the temperature sensor, can improve the lifespan of the relay and even the entire battery pack system while ensuring safety, protecting it from the fatal effects of abnormal vehicle operating conditions.

[0052] This invention discloses a snap-fit ​​electromagnetic relay with a circuit board. Epoxy resin is also filled between the base 2 and the opening of the outer casing 1, fixing the stationary springs 41 and 42, the base 2, the outer casing 1, and the PCB board 5 together. The epoxy resin also covers the corresponding components on the PCB board 5, thereby achieving the fixation and encapsulation of the relay structure. This structure of the invention fixes the relay structure and encapsulates the interior of the relay to prevent external moisture from entering. Simultaneously, the epoxy resin covers the relevant components on the PCB board, fixing and protecting each part on the PCB board.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A snap-action electromagnetic relay with a circuit board, comprising a housing, a base, a magnetic circuit portion, and a stationary spring portion; the stationary spring portion includes two stationary spring plates for realizing current inflow and outflow; the magnetic circuit portion and the stationary spring portion are respectively mounted on the base, with the leads of the stationary spring portion extending out of the lower surface of the base; the housing covers the base from top to bottom and accommodates the contact portions of the magnetic circuit portion and the stationary spring portion within the space enclosed by the housing and the base, the base also being accommodated within the opening of the housing; characterized in that: The relay also includes a PCB board; the PCB board is electrically connected to the coil lead and two stationary springs of the magnetic circuit section, respectively. The PCB board is mounted on the lower surface of the base and housed within the cover of the housing. A connector is integrally provided on the lower surface of the base near the mounting position of the PCB board. The connector has several pins that are electrically connected to the PCB board. Of the two stationary springs, the lead of one spring passes downward through the PCB board, and the lead of the other spring extends downward from the side of the PCB board. The PCB board has a first through hole for accommodating the lead of one of the stationary springs.

2. The snap-action electromagnetic relay with circuit board according to claim 1, characterized in that: The pin is U-shaped, with one end inserted downwards into the PCB board and electrically connected to it, and the other end pointing downwards as a lead-out pin.

3. The snap-action electromagnetic relay with circuit board according to claim 1, characterized in that: One of the stationary springs has a downwardly protruding first protrusion on one side of its lead-out foot. The PCB board has a second through hole at the corresponding position. The first protrusion of the lead-out foot of the one stationary spring is adapted to and fixed in the second through hole of the PCB board, thereby achieving electrical connection between the one stationary spring and the PCB board; and / or, one side of the lead-out foot of the other stationary spring is bent toward the top of the PCB board and has a downwardly protruding second protrusion. The PCB board has a third through hole at the corresponding position. The second protrusion of the lead-out foot of the other stationary spring is adapted to and fixed in the third through hole of the PCB board, thereby achieving electrical connection between the other stationary spring and the PCB board.

4. The snap-action electromagnetic relay with circuit board according to claim 3, characterized in that: In the PCB board, a temperature sensor is also provided near at least one of the two stationary springs.

5. The snap-action electromagnetic relay with circuit board according to claim 4, characterized in that: One side of the lead-out pin of the other stationary spring is bent towards the top of the PCB board and is positioned corresponding to the temperature sensor. The other side of the lead-out pin of the other stationary spring is bent towards the top of the PCB board and is in close contact with the top of the PCB board.

6. The snap-action electromagnetic relay with circuit board according to claim 1, characterized in that: Epoxy resin is also filled between the base and the housing opening to fix the stationary spring, base, housing and PCB board together; the epoxy resin also covers the corresponding components on the PCB board, thereby achieving the fixation and encapsulation of the relay structure.

7. The snap-action electromagnetic relay with circuit board according to claim 1, characterized in that: The magnetic circuit section includes a coil frame; the end of the coil lead is provided with a slot, and is fixed by the slot to a solder pad provided in one of the flanges of the coil frame; the PCB board is provided with a fourth through hole; the coil lead is provided with a pin-type protrusion; the pin-type protrusion of the coil lead is adapted to and fixed in the fourth through hole of the PCB board, so as to realize the electrical connection between the coil lead of the magnetic circuit section and the PCB board.

8. The snap-action electromagnetic relay with circuit board according to claim 7, characterized in that: The coil frame has hooks on both sides of the other flange and locking holes in the corresponding side wall of the base. When the magnetic circuit part is installed in the base, the hooks on both sides of the other flange of the coil frame are respectively locked into the locking holes of the base.

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