CN114823226A

CN114823226A - Electromagnetic relay

Info

Publication number: CN114823226A
Application number: CN202210545499.9A
Authority: CN
Inventors: 邵志勇; 孙溢玉; 陈可璜
Original assignee: Xiamen Hongfa Automotive Electronics Co Ltd
Current assignee: Xiamen Hongfa Automotive Electronics Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-07-29

Abstract

The invention discloses an electromagnetic relay, which comprises a relay main body and a circuit board, wherein the circuit board is provided with a plurality of coil inserting sheet terminals, a movable spring inserting sheet terminal and a static spring inserting sheet terminal; the relay main body is provided with at least two groups of contacts and a plurality of coil leading-out pins, each group of contacts is respectively provided with a movable spring leading-out pin and a static spring leading-out pin, the circuit board is provided with a first conductive pattern and a second conductive pattern which are insulated from each other, the movable spring leading-out pin and the movable spring inserting piece terminal of each group of contacts are respectively and electrically connected to the first conductive pattern, and the static spring leading-out pin and the static spring inserting piece terminal of each group of contacts are respectively and electrically connected to the second conductive pattern; the coil leading-out pins are electrically connected with the coil insert terminals one by one. The invention adopts a single relay main body to realize the parallel connection of two groups of contacts, thereby improving the current carrying capacity of the single relay main body, enabling the invention to be applied to the environment with larger load current and simultaneously ensuring the miniaturization of the whole volume.

Description

Electromagnetic relay

Technical Field

The invention relates to the technical field of relays, in particular to an electromagnetic relay.

Background

An electromagnetic relay of prior art includes shell, base, relay main part, circuit board and welds a plurality of inserted sheet terminals on the circuit board, and each pin of leading out of relay main part passes through circuit board and inserted sheet terminal electric connection respectively, shell and base snap-fit, and relay main part, circuit board are fixed between shell and base. The relay main body is provided with the outer shell, and the outer shell on the outermost layer is added to form the double-layer outer shell, so that the working noise of the relay main body is attenuated through vibration transmission of the two outer shells, and the purpose of reducing the noise is achieved. In order to improve the current carrying capacity of the contacts, a relay with a large size or two relay main bodies are adopted, each relay main body is provided with a group of contacts, and the two relay main bodies are connected in parallel by combining a circuit board and an insert terminal. However, this approach makes the structure of the entire relay complicated and the volume is increased by almost two times as compared with an electromagnetic relay having only a single relay main body, which is very disadvantageous for the miniaturization of the relay.

Disclosure of Invention

The present invention has been made in view of the technical problems of the prior art, and provides an electromagnetic relay in which the structure of the relay main body is improved, so that the present invention can improve the current carrying capacity of the contacts and ensure the overall miniaturization.

The technical scheme adopted by the invention for solving the technical problems is as follows: an electromagnetic relay comprises a relay main body and a circuit board, wherein a plurality of coil insert terminals, a movable spring insert terminal and a static spring insert terminal are arranged on the circuit board; the relay main body is provided with at least two groups of contacts and a plurality of coil leading-out pins, each group of contacts is respectively provided with a movable spring leading-out pin and a static spring leading-out pin, the circuit board is provided with a first conductive pattern and a second conductive pattern which are insulated from each other, the movable spring leading-out pin and the movable spring inserting piece terminal of each group of contacts are respectively and electrically connected to the first conductive pattern, and the static spring leading-out pin and the static spring inserting piece terminal of each group of contacts are respectively and electrically connected to the second conductive pattern; the coil leading-out pins are electrically connected with the coil insert terminals one by one.

Further, the circuit board is also provided with a plurality of third conductive patterns insulated from the first conductive patterns and the second conductive patterns, and the plurality of third conductive patterns are mutually insulated; the third conductive patterns correspond to the coil leading-out pins one by one, and the plurality of coil leading-out pins are electrically connected to the corresponding third conductive patterns respectively with the corresponding coil insert terminals.

Furthermore, the coil leading-out pin is positioned between the movable spring leading-out pin and the static spring leading-out pin, and the static spring inserting piece terminal is positioned between the coil inserting piece terminal and the movable spring inserting piece terminal; the widths of the movable spring insert terminal and the static spring insert terminal are respectively 2 times larger than those of the movable spring lead-out pin and the static spring lead-out pin.

Furthermore, the circuit board is also provided with two insulating plates, and the two first conductive patterns are respectively arranged on the upper surface and the lower surface of the insulating plates and correspond to each other up and down; the movable spring pin-out pins are electrically connected to the two first conductive patterns, and the movable spring insert terminals are electrically connected to the two first conductive patterns; the number of the second conductive patterns is two, and the two second conductive patterns are respectively arranged on the upper surface and the lower surface of the insulating plate and correspond to each other up and down; the static spring leading-out pin is electrically connected with the two second conductive patterns, and the static spring inserting sheet terminal is electrically connected with the two second conductive patterns; the number of the third conductive patterns is two, each group of the third conductive patterns comprises a plurality of third conductive patterns, and the two groups of the third conductive patterns are respectively arranged on the upper surface and the lower surface of the insulating plate; the coil pin-out terminals are electrically connected to the corresponding upper and lower second conductive patterns, and the coil insert terminals are electrically connected to the corresponding upper and lower second conductive patterns.

Further, the two first conductive patterns are electrically connected by one or more first conductive structures; the two second conductive patterns are electrically connected by one or more second conductive structures.

Furthermore, the circuit board is provided with a plurality of first through holes which are communicated up and down, a part of the first through holes penetrate through the two first conductive patterns, and the other first through holes penetrate through the two second conductive patterns; the first and second conductive structures each include a first conductor located in a respective via; the first conductor is in a hollow shape with the periphery closed and the upper part and the lower part communicated with each other, and/or the first conductor, the first conductive pattern and the second conductive pattern are made of the same conductive material.

Furthermore, the circuit board is provided with second through holes which are vertically through, which are arranged at positions corresponding to the movable spring lead-out pins, the movable spring insert sheet terminals, the static spring lead-out pins, the static spring insert sheet terminals, the coil lead-out pins and the coil insert sheet terminals, respectively, a second conductor which is closed at the periphery and vertically through is arranged in the second through holes, and the upper end and the lower end of the second conductor are electrically connected with the two first conductive patterns or the two second conductive patterns or the two third conductive patterns which are vertically corresponding, respectively; the movable spring lead-out pin, the movable spring inserting piece terminal, the static spring lead-out pin, the static spring inserting piece terminal, the coil lead-out pin and the coil inserting piece terminal are respectively inserted into the corresponding second conductors and are welded and fixed with the corresponding second conductors; the second conductor, the first conductive pattern, the second conductive pattern, and the third conductive pattern are made of the same conductive material.

Furthermore, the relay main body is provided with two groups of coils, the number of the coil leading-out pins is three, one coil leading-out pin is a common end electrically connected with one ends of the two groups of coils, the other two coil leading-out pins are respectively electrically connected with the other ends of the two groups of coils, and an electronic component for suppressing transient current is electrically connected between the other two coil leading-out pins; the first conductive pattern and the second conductive pattern are respectively positioned on two sides of the transient current suppression electronic component along the length direction of the relay main body.

Further, the transient current suppression electronic component is a resistor, and/or the transient current suppression electronic component is welded on one surface of the circuit board facing the relay main body.

The relay comprises a relay body, a circuit board and a coil inserting piece terminal, and is characterized by further comprising a base and a shell with an opening at the bottom end, wherein the bottom end of the shell is connected with the base, the base and the shell form an accommodating cavity in an enclosing mode, the relay body and the circuit board are located in the accommodating cavity, and the coil inserting piece terminal, the movable spring inserting piece terminal and the static spring inserting piece terminal respectively penetrate through the base downwards; the length of the circuit board is greater than or equal to that of the shell of the relay main body, and the width of the circuit board is greater than or equal to that of the shell of the relay main body, so that the circuit board can support the shell of the relay main body. .

Compared with the prior art, the invention has the following beneficial effects:

1. because the relay main body is provided with at least two groups of contacts, the circuit board is provided with a first conductive pattern and a second conductive pattern which are insulated from each other, the movable spring leading-out pin and the movable spring inserting piece terminal of each group of contacts are respectively and electrically connected with the first conductive pattern, and the static spring leading-out pin and the static spring inserting piece terminal of each group of contacts are respectively and electrically connected with the second conductive pattern, the invention can realize the parallel connection of the two groups of contacts by adopting the matching of the single relay main body and the circuit board, the movable spring inserting piece terminal and the static spring inserting piece terminal, thereby improving the current carrying capacity of the single relay main body, improving the original load current of 15A to the environment with the load current of 30A, and simultaneously ensuring the miniaturization of the whole volume.

2. The coil pin is located between movable spring pin and the quiet spring pin, quiet spring inserted sheet terminal is then located between coil inserted sheet terminal and the movable spring inserted sheet terminal, can ensure that the area of the second electrically conductive figure at quiet spring inserted sheet terminal place is great to improve the current-carrying capacity and the radiating effect of second electrically conductive figure.

3. Each conductive pattern (the first conductive pattern, the second conductive pattern and the third conductive pattern) adopts a double-layer form distributed up and down, and the current carrying capacity and the heat dissipation effect of each conductive pattern can be improved.

4. The arrangement of the first conductive structure and the second conductive structure can further improve the current carrying capacity of the first conductive pattern/the second conductive pattern, and can also realize heat transfer between the upper first conductive pattern and the lower first conductive pattern/the upper second conductive pattern and further improve the heat dissipation effect. Particularly, the first conductive structure and the second conductive structure respectively comprise first conductors positioned in corresponding through holes, and the first conductors are in a hollow shape which is sealed at the periphery and is through up and down, so that the processing technology of the first conductive structure and the second conductive structure is simple, and the heat dissipation effect of the upper first conductive pattern and the lower first conductive pattern/the upper second conductive pattern and the lower second conductive pattern can be further improved by utilizing the characteristic that the first conductors are in the hollow shape which is through up and down.

5. The number of the coil leading-out pins is three, and transient current suppression electronic components are electrically connected between the other two coil leading-out pins, so that at the moment of power failure of the coil of the relay main body, large reverse high voltage (self-induced electromotive force) generated between the other two coil leading-out pins can be released through the transient current suppression electronic components. Particularly, the transient current suppression electronic component is welded on one surface of the circuit board facing the relay main body, so that the connection process of the transient current suppression electronic component is simpler, and two times of reflow soldering (if the transient current suppression electronic component is placed on the reverse surface, two times of reflow soldering are needed) are not needed, and the process cost can be saved. The transient current suppression electronic component is preferably provided with a resistor and is low in cost.

The invention is further explained in detail with the accompanying drawings and the embodiments; an electromagnetic relay of the present invention is not limited to the embodiment.

Drawings

FIG. 1 is an exploded view of the present invention I (without the outermost shell, base);

FIG. 2 is a schematic diagram of a relay body of the present invention;

FIG. 3 is an exploded schematic view of the relay body of the present invention;

FIG. 4 is a schematic perspective view of the circuit board of the present invention;

FIG. 5 is a top view of the circuit board of the present invention after soldering the tab terminals;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

fig. 7 is a schematic perspective view of a relay body of the present invention combined with a circuit board;

FIG. 8 is an exploded view of the second embodiment of the present invention (including the outermost shell and base);

FIG. 9 is a first perspective view of the present invention;

fig. 10 is a schematic perspective view of the present invention.

Detailed Description

The terms "first," "second," "third," and the like in this disclosure are used solely to distinguish between similar items and not necessarily to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. In the description, the directions or positional relationships indicated by "up", "down", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the scope of the present invention. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., A, and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Referring to fig. 1 to 10, an electromagnetic relay according to the present invention includes a relay main body 1 and a circuit board 2, wherein the circuit board 2 is provided with a plurality of coil insert terminals 5, a moving spring insert terminal 3 and a static spring insert terminal 4; the relay main body 1 is provided with at least two groups of contacts and a plurality of coil leading-out pins 13, each group of contacts respectively comprises a movable spring piece, a movable contact arranged on the movable spring piece, a movable spring leading-out pin 11 arranged on the movable spring piece, a static contact arranged on the static spring piece and a static spring leading-out pin 12 arranged on the static spring piece, and the movable contact and the static contact are correspondingly matched to realize contact attraction or disconnection. The circuit board 2 is provided with a first conductive pattern 21 and a second conductive pattern 22 which are insulated from each other, a movable spring leading-out pin 11 and a movable spring inserting sheet terminal 3 of each group of contacts are respectively and electrically connected with the first conductive pattern 21, and a static spring leading-out pin 12 and a static spring inserting sheet terminal 4 of each group of contacts are respectively and electrically connected with the second conductive pattern 22; the coil lead-out pins 13 are electrically connected with the coil insert terminals 5 one by one. The relay body 1 specifically has two sets of contacts, but is not limited thereto, and the movable spring pieces of the two sets of contacts are integrally formed, but is not limited thereto.

In this embodiment, the relay main body 1 has two sets of coils and three coil pins 13 in total, one of the coil pins is a common terminal electrically connected to one ends of the two sets of coils, and the other two coil pins are electrically connected to the other ends of the two sets of coils respectively. As shown in fig. 2,

numerals

2, 6, and 1 in fig. 2 indicate three coil lead-out pins 13, the coil lead-out pin indicated by 6 is the common end, and the coil lead-out pins indicated by 2 and 1 are the other two coil lead-out pins, respectively; the number 3 in fig. 2 indicates the moving spring legs 11 of the two sets of contacts, and the

numbers

4, 5 indicate the stationary spring legs 12 of the two sets of contacts. The relay body 1 is specifically a magnetic latching relay, but is not limited to this, and the coil leading pins of the

numbers

1 and 2 are respectively electrified to control the on-off of the contacts. In other embodiments, the relay body is a non-magnetically held electromagnetic relay. As shown in fig. 3, the relay main body 1 includes a movement portion 15, a housing 14, and a bottom cover, and the movement portion 15 includes a magnetic circuit portion, a contact portion, and the like, and the contact portion includes the two sets of contacts. The length of the circuit board 2 is greater than or equal to the length of the relay main body casing 14, and the width of the circuit board 2 is greater than or equal to the width of the relay main body casing 14, so that the circuit board 2 can support the relay main body casing 14.

In this embodiment, as shown in fig. 4, the circuit board 2 further has a plurality of third conductive patterns 23 insulated from the first conductive patterns 21 and the second conductive patterns 22, and the plurality of third conductive patterns 23 are insulated from each other; the third conductive patterns 23 correspond to the coil pins 13 one by one, and the coil pins 13 are electrically connected to the corresponding third conductive patterns respectively with the corresponding coil insert terminals 5. In this embodiment, the coil pin 13 is located between the movable spring pin 11 and the static spring pin 12, and the static spring insert terminal 4 is located between the coil insert terminal 5 and the movable spring insert terminal 3. According to the invention, after the static spring insert terminal 4 and the static spring lead-out pin 12 are staggered by a larger space in the height direction, the area of the second conductive pattern 22 is greatly increased, even larger than that of the first conductive pattern 21, so that the area of the second conductive pattern 22 where the static spring insert terminal 4 is positioned can be ensured to be large enough, the current carrying capacity and the heat dissipation effect of the second conductive pattern 22 can be improved, and the problems of insufficient current carrying capacity and poor heat dissipation effect caused by the small area of the second conductive pattern 22 are avoided. Since the relay body 1 has two sets of coils and three coil lead pins 13 in common, the plurality of third conductive patterns 23 are specifically three third conductive patterns 23. The first conductive pattern 21 and the second conductive pattern 22 are distributed along the length direction of the circuit board 2, and the three third conductive patterns 23 are distributed along the width direction of the circuit board 2.

In this embodiment, as shown in fig. 5 and 6, the circuit board 2 further includes an insulating plate 24, the number of the first conductive patterns 21 is two, and the two first conductive patterns 21 are respectively disposed on the upper surface and the lower surface of the insulating plate 24 and correspond to each other in the vertical direction; the movable spring leading pin 11 is electrically connected to the two first conductive patterns 21, and the movable spring insert terminal 3 is also electrically connected to the two first conductive patterns 21; the number of the second conductive patterns 22 is two, and the two second conductive patterns 22 are respectively arranged on the upper surface and the lower surface of the insulating plate 24 and correspond to each other up and down; the static spring lead-out pin 12 is electrically connected to the two second conductive patterns 22, and the static spring insert terminal 4 is also electrically connected to the two second conductive patterns 22; the number of the third conductive patterns 23 is two, each of the groups includes the plurality of (three in this embodiment) third conductive patterns, and the two groups of the third conductive patterns 23 are respectively disposed on the upper surface and the lower surface of the insulating plate 24; the coil lead-out pins 13 are electrically connected to the corresponding upper and lower third conductive patterns, and the coil insert sheet terminals 5 are electrically connected to the corresponding upper and lower second conductive patterns.

In this embodiment, in addition to the two first conductive patterns 21 forming a conductive path through the moving spring lead-out pin 11 and the moving spring insert terminal 3, the two first conductive patterns 21 are further electrically connected by using one or more first conductive structures. Similarly, the two second conductive patterns 22 are further electrically connected by one or more second conductive structures, except that a conductive path is formed between the static spring lead-out pin 12 and the static spring insert terminal 4. Thus, not only the current carrying capacity of the first conductive pattern 21/the second conductive pattern 22 can be further improved, but also the heat transfer between the upper and lower first conductive patterns 21/the upper and lower second conductive patterns 22 can be realized, thereby further improving the heat dissipation effect.

In this embodiment, as shown in fig. 4 to 6, the circuit board 2 is provided with a plurality of first through holes 25 which are through up and down, a part of the first through holes penetrate through the two first conductive patterns 21, and the other first through holes penetrate through the two second conductive patterns 22; the first and second conductive structures each include a first conductor 27 located in a respective via. The first conductor 27 is a hollow shape with a closed periphery and a through-hole in the top and bottom, and the first conductor 27, the first conductive pattern 21, and the second conductive pattern 22 are made of the same conductive material. The first conductors 27 in every two first through holes 25 and the second conductors 28 of the second through holes 26 described below form an upper first conductive pattern and a lower first conductive pattern or an upper second conductive pattern and a lower second conductive pattern which are connected in parallel, and a plurality of first conductors and second conductors 28 are connected in parallel for multiple times, so that shunting is realized, and heat generation is reduced.

In this embodiment, as shown in fig. 4 to 6, the circuit board 2 is provided with second through holes 26 which are through up and down at positions corresponding to the movable spring pins 11, the movable spring pin terminals 3, the static spring pins 12, the static spring pin terminals 4, the coil pins 13, and the coil pin terminals 5, a second conductor 28 which is closed at the periphery and through up and down is arranged in the second through holes 26, and the upper and lower ends of the second conductor 28 are electrically connected to the two first conductive patterns 21, the two second conductive patterns 22, or the two third conductive patterns 23 corresponding to each other up and down; the movable spring leading-out pin 11, the movable spring insert sheet terminal 3, the static spring leading-out pin 12 and the static spring insert sheet terminal 4 are respectively inserted into the corresponding second conductors 28 and are welded and fixed with the corresponding second conductors 28 through solder paste 29; the second conductor 28, the first conductive pattern 21, the second conductive pattern 22, and the third conductive pattern 23 are made of the same conductive material.

In this embodiment, the width of the movable spring insert terminal 3 and the width of the static spring insert terminal 4 are larger, specifically, the width of the movable spring insert terminal 3 and the width of the static spring insert terminal 4 are respectively 2 times larger than the width of the movable spring lead-out pin 11 and the width of the static spring lead-out pin 12, so as to ensure the current-carrying capacity, in order to ensure the firmness after welding, two welding pins 31 are arranged at the welding position of the movable spring insert terminal 3 and the first conductive pattern 21, and similarly, two welding pins are also arranged at the welding position of the static spring insert terminal 4 and the second conductive pattern 22, as shown in fig. 1. The parts of the movable spring insert terminal 3 and the static spring insert terminal 4 close to the welding feet are provided with strip guide head holes 32 of a die for positioning the die in a stamping manner, and the strip width can be reduced by placing the movable spring insert terminal and the static spring insert terminal at the positions. The two welding feet are arranged, so that welding is firmer and the current carrying capacity is better.

In this embodiment, the lead pins (i.e., the movable spring lead pin 11, the stationary spring lead pin 12, and the coil lead pin 13) and the blade terminals (i.e., the movable spring blade terminal 3, the stationary spring blade terminal 4, and the coil blade terminal 5) are welded to the corresponding second conductors in the same manner. Specifically, the welding method of the static spring tab terminal 4 and the second conductor 28 is explained as follows: as shown in fig. 6, the leg of the dead spring tab terminal 4 is inserted into the second conductor 28, and solder paste 29 is filled between the leg of the dead spring tab terminal 4 and the second conductor 28, and reflow soldering is performed.

In this embodiment, the transient current suppression electronic components are electrically connected between the remaining two coil pins 13, and the first conductive pattern 21 and the second conductive pattern 22 are respectively located on two sides of the transient current suppression electronic components along the length direction of the relay body. The transient current suppressing electronic component is specifically a resistor 6, but is not limited thereto, and in other embodiments, the transient current suppressing electronic component is a diode or the like. The resistor 6 is specifically welded on one surface of the circuit board 2 facing the relay main body 1, so that the connection process of the resistor 6 is simpler, and the process cost can be saved without twice reflow soldering. Specifically, two ends of the resistor 6 are respectively soldered to the two third conductive patterns 23 on the upper layer, which are electrically connected to the two other coil pins 13, as shown in fig. 1. The transient current suppression electronic component (i.e. the resistor 6) is arranged, so that at the moment of power failure of the coil of the relay main body 1, a large reverse high voltage (which is self-induced electromotive force) generated between the other two coil leading-out pins 13 can be released through the resistor 6.

In this embodiment, as shown in fig. 8-10, the present invention further includes a base 8 and a housing 7 with an opening at a bottom end, the bottom end of the housing 7 is connected to the base 8 in a snap-fit manner, and the housing and the base enclose a housing cavity, the relay main body 1 and the circuit board 2 are contained in the housing cavity, and the coil insert terminal 5, the moving spring insert terminal 3 and the static spring insert terminal 4 respectively penetrate through the base 8 downward. Thus, the operating noise of the relay main body 1 can be attenuated by the vibration propagation of the housing 14 and the casing 7, and the purpose of reducing the noise is achieved.

According to the electromagnetic relay, the relay main body 1 realizes the parallel connection of two groups of contacts, and each group of contacts can carry current 15A, so that the electromagnetic relay can be applied to a large load current environment of 30A. Each conductive pattern (first conductive pattern/second conductive pattern/third conductive pattern) adopts a double-layer form distributed up and down, so that the upper and lower conductive patterns can realize parallel shunting, each insert terminal is connected with the upper and lower conductive patterns and can carry current 30A, as shown in figure 6, and the arrow in the figure indicates the current direction. Therefore, the single relay main body is adopted, two groups of contacts are connected in parallel through the matching of the circuit board and the inserting piece terminal, the current carrying capacity of the single relay main body can be improved, the single relay main body can be applied to the environment with larger load current (30A), and meanwhile the miniaturization of the whole volume can be ensured.

The parts which are not involved in the electromagnetic relay are the same as or can be realized by the prior art.

The above embodiments are only used to further illustrate the electromagnetic relay of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay comprises a relay main body and a circuit board, wherein a plurality of coil insert terminals, a movable spring insert terminal and a static spring insert terminal are arranged on the circuit board; the method is characterized in that: the relay main body is provided with at least two groups of contacts and a plurality of coil leading-out pins, each group of contacts is respectively provided with a movable spring leading-out pin and a static spring leading-out pin, the circuit board is provided with a first conductive pattern and a second conductive pattern which are insulated from each other, the movable spring leading-out pin and the movable spring inserting piece terminal of each group of contacts are respectively and electrically connected to the first conductive pattern, and the static spring leading-out pin and the static spring inserting piece terminal of each group of contacts are respectively and electrically connected to the second conductive pattern; the coil leading-out pins are electrically connected with the coil insert terminals one by one.

2. An electromagnetic relay according to claim 1, characterized in that: the circuit board is also provided with a plurality of third conductive patterns insulated from the first conductive patterns and the second conductive patterns, and the plurality of third conductive patterns are mutually insulated; the third conductive patterns correspond to the coil leading-out pins one by one, and the plurality of coil leading-out pins are electrically connected to the corresponding third conductive patterns respectively with the corresponding coil insert terminals.

3. An electromagnetic relay according to claim 1 or 2, characterized in that: the coil leading-out pin is positioned between the movable spring leading-out pin and the static spring leading-out pin, and the static spring insert sheet terminal is positioned between the coil insert sheet terminal and the movable spring insert sheet terminal; the widths of the movable spring insert terminal and the static spring insert terminal are respectively 2 times larger than those of the movable spring lead-out pin and the static spring lead-out pin.

4. An electromagnetic relay according to claim 2, characterized in that: the circuit board is also provided with two insulating plates, and the two first conductive patterns are respectively arranged on the upper surface and the lower surface of the insulating plates and correspond to each other up and down; the movable spring pin-out pins are electrically connected to the two first conductive patterns, and the movable spring insert terminals are electrically connected to the two first conductive patterns; the number of the second conductive patterns is two, and the two second conductive patterns are respectively arranged on the upper surface and the lower surface of the insulating plate and correspond to each other up and down; the static spring leading-out pin is electrically connected with the two second conductive patterns, and the static spring inserting sheet terminal is electrically connected with the two second conductive patterns; the number of the third conductive patterns is two, each group of the third conductive patterns comprises a plurality of third conductive patterns, and the two groups of the third conductive patterns are respectively arranged on the upper surface and the lower surface of the insulating plate; the coil pin-out terminals are electrically connected to the corresponding upper and lower second conductive patterns, and the coil insert terminals are electrically connected to the corresponding upper and lower second conductive patterns.

5. An electromagnetic relay according to claim 4, characterized in that: the two first conductive patterns are electrically connected by adopting one or more first conductive structures; the two second conductive patterns are electrically connected by one or more second conductive structures.

6. An electromagnetic relay according to claim 5, characterized in that: the circuit board is provided with a plurality of first through holes which are communicated up and down, a part of the first through holes penetrate through the two first conductive patterns, and the other first through holes penetrate through the two second conductive patterns; the first and second conductive structures each include a first conductor located in a respective via; the first conductor is in a hollow shape with the periphery closed and the upper part and the lower part communicated with each other, and/or the first conductor, the first conductive pattern and the second conductive pattern are made of the same conductive material.

7. An electromagnetic relay according to claim 4, characterized in that: the positions of the circuit board corresponding to the movable spring leading-out pin, the movable spring inserting piece terminal, the static spring leading-out pin, the static spring inserting piece terminal, the coil leading-out pin and the coil inserting piece terminal are respectively provided with a second through hole which is through up and down, a second conductor which is closed at the periphery and is through up and down is arranged in the second through hole, and the upper end and the lower end of the second conductor are respectively and electrically connected with the two first conductive patterns or the two second conductive patterns or the two third conductive patterns which correspond up and down; the movable spring lead-out pin, the movable spring inserting piece terminal, the static spring lead-out pin, the static spring inserting piece terminal, the coil lead-out pin and the coil inserting piece terminal are respectively inserted into the corresponding second conductors and are welded and fixed with the corresponding second conductors; the second conductor, the first conductive pattern, the second conductive pattern, and the third conductive pattern are made of the same conductive material.

8. An electromagnetic relay according to claim 1, characterized in that: the relay main body is provided with two groups of coils, the number of the coil leading-out pins is three, one coil leading-out pin is a common end electrically connected with one ends of the two groups of coils, the other two coil leading-out pins are respectively electrically connected with the other ends of the two groups of coils, and an electronic component for suppressing transient current is electrically connected between the other two coil leading-out pins; the first conductive pattern and the second conductive pattern are respectively positioned on two sides of the transient current suppression electronic component along the length direction of the relay main body.

9. An electromagnetic relay according to claim 8, characterized in that: the transient current suppression electronic component is a resistor, and/or is welded on one surface of the circuit board facing the relay main body.

10. An electromagnetic relay according to claim 1, characterized in that: the relay comprises a relay main body and a circuit board, and is characterized by further comprising a base and a shell with an opening at the bottom end, wherein the bottom end of the shell is connected with the base, the base and the shell form an accommodating cavity in an enclosing mode, the relay main body and the circuit board are located in the accommodating cavity, and the coil inserting piece terminal, the movable spring inserting piece terminal and the static spring inserting piece terminal respectively penetrate through the base downwards; the length of the circuit board is greater than or equal to that of the shell of the relay main body, and the width of the circuit board is greater than or equal to that of the shell of the relay main body, so that the circuit board can support the shell of the relay main body.