CN117498056A - Electric connector, circuit board assembly, board-to-board connector and electronic equipment - Google Patents

Abstract

The application discloses an electric connector, a circuit board assembly, a board-to-board connector and electronic equipment, which belong to the technical field of circuit board testing, wherein the electric connector is attached to the circuit board and comprises an insulating base body, functional pins and a test piece; the functional pins and the test piece are arranged on the insulating base body, the functional pins are electrically connected with the circuit board, at least one pin of the functional pins is electrically connected with the test piece, and at least part of the test piece is exposed out of the insulating base body; the test piece can be used for electrically connecting an external test mechanism under the condition of testing the circuit board.

Description

Electric connector, circuit board assembly, board-to-board connector and electronic equipment

Technical Field

The application belongs to the technical field of circuit board testing, and particularly relates to an electric connector, a circuit board assembly, a board-to-board connector and electronic equipment.

Background

The circuit board is an important component of the electronic equipment, and electronic components can be attached to the circuit board. For example, electronic components such as a radio frequency chip, a processor chip, a power management chip, a memory chip, a capacitor, a resistor, and the like may be mounted on the circuit board. After the procedures of tin-plating paster, mounting and the like are finished, the functions of the circuit board and the mounted electronic components on the circuit board are required to be tested, and the fault circuit board is judged and recovered according to the test result to be reprocessed so as to improve the delivery quality of the circuit board.

In the related art, in order to implement a test on a circuit board, a test circuit exposed on a surface of the circuit board needs to be separately disposed on the circuit board. The exposed test circuit on the surface of the circuit board is contacted with the contact pins of the external test mechanism during the test of the circuit board, so that the electric connection is realized, and the test of the circuit board is realized.

However, the test circuit provided on the circuit board needs to occupy a large area of the circuit board, thus resulting in a smaller effective layout space of the circuit board in the related art.

Disclosure of Invention

An objective of the embodiments of the present application is to provide an electrical connector, a circuit board assembly, a board-to-board connector and an electronic device, which can solve the problem that the effective layout space of the circuit board is smaller.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, an embodiment of the present application provides an electrical connector, where the electrical connector is attached to a circuit board, and the electrical connector includes an insulating base, a functional pin, and a test piece;

the functional pins and the test piece are arranged on the insulating base body, the functional pins are electrically connected with the circuit board, at least one pin of the functional pins is electrically connected with the test piece, and at least part of the test piece is exposed out of the insulating base body; the test piece can be used for electrically connecting an external test mechanism under the condition of testing the circuit board.

In a second aspect, embodiments of the present application provide a board-to-board connector, where the board-to-board connector includes a first connector and a second connector that are mutually engaged and connected, and at least one of the first connector and the second connector is the electrical connector described above.

In a third aspect, an embodiment of the present application provides a circuit board assembly, including a circuit board and the above-mentioned electrical connector, the electrical connector patch in the circuit board, the functional pin of the electrical connector with the circuit board is electrically connected, the test piece of the electrical connector can be used to electrically connect an external testing mechanism under the condition that the circuit board is tested.

In a fourth aspect, an embodiment of the present application provides an electronic device, including a functional module, a circuit board, and the electrical connector described above; the electric connector is attached to the circuit board, and the functional module is electrically connected with the circuit board through the electric connector.

In this application embodiment, the test piece can be used to electrically connect external test mechanism under the circumstances of testing the circuit board, and the test piece that this application disclosed forms on electric connector, and the test piece is connected with the circuit board electricity through at least one pin in the functional pin on the electric connector. Therefore, at least one pin of the test piece electrically connected with the test piece forms a test circuit for being electrically connected with an external test mechanism during the test of the circuit board. In the scheme disclosed by the application, the test piece and at least one pin electrically connected with the test piece form a test circuit, that is to say, the test circuit is arranged on the electric connector, so that the test circuit is not required to be arranged on the circuit board, the layout space of the circuit board can be effectively saved, and the effective layout space of the circuit board is further increased.

Drawings

Fig. 1 is a schematic structural view of a first electrical connector disclosed in an embodiment of the present application;

FIG. 2 is a schematic structural view of a second electrical connector disclosed in an embodiment of the present application;

FIG. 3 is a schematic structural view of a third electrical connector disclosed in an embodiment of the present application;

fig. 4 is a schematic structural view of a fourth electrical connector disclosed in an embodiment of the present application;

FIG. 5 is a partial cross-sectional view of an electrical connector disclosed in an embodiment of the present application;

fig. 6 is a schematic structural diagram of part of the components of the electronic device disclosed in the embodiment of the present application.

Reference numerals illustrate:

100-circuit board, 200-board-to-board connector, 210-first connector, 211-insulating housing, 211 a-first end, 211 b-second end, 211 c-socket, 212-function pin, 2121-positive power pin, 2121 a-first positive pin, 2121 b-second positive pin, 2121 c-third positive pin, 2122-negative power pin, 2122 a-first negative pin, 2122 b-second negative pin, 2122 c-third negative pin, 2123-signal transmission pin, 213-test piece, 2131-positive test piece, 2132-negative test piece, 220-second connector, 300-function module, 400-external test mechanism.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The electrical connector, the circuit board assembly board-to-board connector and the electronic device provided by the embodiment of the application are described in detail below by means of specific embodiments and application scenes thereof with reference to the accompanying drawings.

In the related art, a circuit board is provided with a test circuit, and the test circuit has size requirements and spacing specification requirements. For example, a minimum diameter of 1.0mm is required for one test point of the test circuit. The center-to-center spacing between two adjacent test points is at least 1.8mm. The edge spacing between each test point and other devices on the circuit board is more than 0.7 to 1.0mm. Therefore, the test circuit occupies at least about 10mm2 of the area of the circuit board, which tends to affect the patch area of the circuit board, thus resulting in a smaller effective layout space of the circuit board.

Referring to fig. 1 to 6, an electrical connector is disclosed in the embodiments of the present application, the electrical connector is attached to a circuit board 100, and the electrical connector can be used to electrically connect the circuit board 100 with a functional module 300 or other electrical devices. The disclosed electrical connector includes an insulating housing 211, functional pins 212, and a test piece 213.

The insulating housing 211 provides mounting space for other components of the electrical connector. For example, the functional pins 212 and the test piece 213 are disposed on the insulating base 211. Alternatively, the insulating base 211 may be made of epoxy, engineering plastic, ceramic, or the like. The functional pins 212 are used to make physical and electrical connections to the circuit board 100.

Specifically, the functional pins 212 are typically soldered to pads of the circuit board 100. Meanwhile, the circuit board 100 is electrically connected with the functional module 300 or other electrical devices through the functional pins 212. For example, the function pins 212 may include a power pin and a signal transmission pin 2123, where the power pin refers to a pin for passing strong electricity, and may specifically be a pin connected to a power supply such as a battery. It is also understood that the power supply pins are pins for passing large currents. The signal transmission pin 2123 refers to a pin for passing weak current, here, a pin for signal transmission, and the signal transmission pin 2123 is not used for supplying power to the connected components.

In the above embodiment, when the circuit board 100 is assembled with the corresponding functional module 300 or the electrical device, the pins of the corresponding electrical connection structure on the functional module 300 or the electrical device need to be correspondingly electrically conducted with the functional pins 212 of the electrical connector in the present application, so as to realize the electrical connection between the circuit board 100 and the functional module 300 or the electrical device.

The test piece 213 in the electrical connector disclosed herein may be used to electrically connect the external test mechanism 400 in the case of testing the circuit board 100. At least one of the functional pins 212 is electrically connected to the test piece 213, and at least a portion of the test piece 213 is exposed from the insulating base 211. It should be understood that, since the test piece 213 needs to be electrically connected to the external test mechanism 400, at least a portion of the test piece 213 needs to be exposed from the insulating base 211, so that contact pins of the external test mechanism 400 can be conveniently contacted with the test piece 213, and thus, the circuit board 100 can be electrically connected to the external test mechanism 400.

In a specific testing process of the circuit board 100, the electrical connector with the test piece 213 is attached to a preset attaching position of the circuit board 100, then, the contact pins of the external testing mechanism 400 are contacted with the test piece 213, and at this time, the external testing mechanism 400 is electrically connected with the circuit board 100 through the electrical connector, so that a corresponding function of the circuit board 100 can be tested.

In the embodiment disclosed herein, the test piece 213 is formed on the electrical connector, and the test piece 213 is electrically connected to the circuit board 100 through at least one of the functional pins 212 on the electrical connector. At least one pin to which the test piece 213 is electrically connected forms a test circuit for electrically connecting with the external test mechanism 400 when the circuit board 100 is tested. Because the test circuit is disposed on the electrical connector, the test circuit is not required to be disposed on the circuit board 100, so that the layout space of the circuit board 100 can be effectively saved, and the effective layout space of the circuit board 100 can be further increased.

The test piece 213 is formed on the electric connector by improving the electric connector connected with the circuit board 100, so that the electric connector and the test circuit can share the patch area of the circuit board 100, thereby saving the area of the circuit board 100 and increasing the effective layout space of the circuit board 100. As described above, the circuit board 100 saves at least 10mm2 of area.

In addition, the test circuit in the related art is separately provided on the surface of the circuit board 100, and thus is easily stained, and thus causes a problem of poor contact, and finally, the through rate and the production efficiency of the test are easily affected. The test piece 213 in this application sets up on electric connector, and electric connector's volume is little, and the region of exposing is also littleer, consequently is difficult to pollute test piece 213, and then is less easy to influence the through rate and the production efficiency of test.

In an alternative, signal transmission pin 2123 of functional pin 212 may be electrically connected to test piece 213, where test piece 213 and signal transmission pin 2123 form a test circuit. The test piece 213 in this embodiment may be used to test a portion of the signal transmission function of the circuit board 100.

In the related art, more applications for testing the circuit board 100 are before the electronic device is assembled in a finished product. At this time, the circuit board 100 is not assembled with the battery, so a test circuit is required to be externally connected to the power supply for performing the functional test of the circuit board 100. The external test mechanism 400 described herein may therefore be understood as an external test power supply. The test piece 213 disclosed in the present application is used to provide electrical energy to the circuit board 100 when testing the circuit board 100, that is, the test piece 213 is used to electrically communicate with an external power source. The test piece 213 disclosed herein may be electrically connected to a power pin in an electrical connector.

In a specific embodiment, the test piece 213 may include a positive test piece 2131 and a negative test piece 2132 disposed at intervals, and the functional pins 212 may include a positive power pin 2121 and a negative power pin 2122 disposed at intervals, with the positive test piece 2131 electrically connected to the positive power pin 2121. The negative electrode test piece 2132 is electrically connected to a negative electrode power supply pin 2122.

During a particular test, the positive contact pin of external test mechanism 400 may be connected to positive test piece 2131 and the negative contact pin of external test mechanism 400 may be in communication with negative test piece 2132.

In this solution, the test piece 213 is connected to a power supply pin, and since the power supply pin needs to ensure its current carrying capability, the power supply pin is usually a large pin, which means that the larger the volume of the pin, and the larger its current carrying capability. Therefore, when the test piece 213 is used for supplying power, the test piece 213 can be connected with a large pin, so that the current carrying performance is ensured, and the risk of pin overload is avoided, so that the reliability and the safety performance of the electric connector are improved.

In the above embodiment, the electrical connector has a large pin, and the scenario that the large pin needs to be used for the test piece 213 can be adopted in the electrical connector disclosed in the present application.

In another alternative embodiment, the electrical connector may be a battery connector. The battery connector is used to make an electrical connection between the circuit board 100 and the battery. In this solution, since the battery connector itself is used to electrically connect the battery with the circuit board 100, a part of the pins of the battery connector itself has a better current-carrying function, so that the formation of the test piece 213 on the battery connector is simpler in structure. In addition, the battery connector itself is used as a power supply device of the circuit board 100, and the circuit board 100 is better in matching with the circuit board 100 for electrically connecting the circuit structure with an external circuit during testing, so that improvement of part of circuits is reduced.

Specifically, the battery connector has the positive power supply pin 2121 and the negative power supply pin 2122 described above, and the positive test piece 2131 may be electrically connected to the positive power supply pin 2121. Negative test piece 2132 may be electrically connected to negative power pin 2122.

In the above embodiment, at least one of the functional pins 212 may be connected to the test piece 213 by a patch, riveting, or the like, however, the connection is poor in reliability and difficult.

Based on this, in another alternative, at least one of the functional pins 212 may be of unitary construction with the test piece 213. At this time, at least one of the functional pins 212 is a metal piece integral with the test piece 213. The scheme can improve the connection strength of the pins and the test piece 213, and further improve the reliability of the pins and the test piece 213. And also simplifies the manufacturing process of the pins and the test piece 213.

Alternatively, at least one of the functional pins 212 may be integrally formed with the test piece 213 by stamping, laser cutting, or the like.

Specifically, positive power pin 2121 of functional pin 212 may include a plurality of positive pins, where the plurality of positive pins are connected in parallel for connecting the positive poles of the battery. The positive electrode test piece 2131 may be in an integral structure with at least one of the positive electrode pins.

Similarly, negative power pin 2122 of functional pin 212 may include a plurality of negative pins, where the plurality of negative pins are connected in parallel for connecting the negative poles of the battery. The negative electrode test piece 2132 may be of unitary construction with at least one of the negative electrode pins.

In an alternative embodiment, the insulating housing 211 has a first end 211a and a second end 211b arranged along its length, which may also be understood herein as the first end 211a and the second end 211b of the electrical connector. The positive power pin 2121 and the positive test piece 2131 may each be disposed at the first end 211a. Negative power pin 2122 and negative test piece 2132 may both be disposed at second end 211b.

In this scheme, negative electrode test piece 2132 and positive electrode test piece 2131 are located at two ends of the electrical connector along the length direction respectively, and at this time, negative electrode test piece 2132 and positive electrode test piece 2131 are far away from each other, so that the use requirement of test piece 213 can be better met, the risk of mutual influence of negative electrode test piece 2132 and positive electrode test piece 2131 is avoided, and the safety and reliability of the electrical connector are further improved.

Further, the positive electrode test piece 2131, the signal transmission pin 2123, and the negative electrode test piece 2132 may be arranged at intervals along the length direction of the insulating holder 211. At this time, the signal transmission pin 2123 is disposed between the positive electrode test piece 2131 and the negative electrode test piece 2132, so that the distance between the positive electrode test piece 2131 and the negative electrode test piece 2132 is further increased, and further the risk of the negative electrode test piece 2132 and the positive electrode test piece 2131 affecting each other is further avoided.

In the above embodiment, the positive electrode test piece 2131 may extend out of the electrical connector along the side wall of the insulation base 211, at this time, the positive electrode test piece 2131 is easy to interfere with and collide with other components, and thus the positive electrode test piece 2131 is easy to be damaged.

Based on this, in another alternative embodiment, as shown in fig. 1 to 4, the positive power supply pin 2121 may include first, second, and third positive pins 2121a, 2121b, and 2121c distributed along a circumferential direction of the insulating holder 211, and the first, second, and third positive pins 2121a, 2121b, and 2121c may surround the positive test piece 2131.

In this scheme, three positive electrode pins can surround positive electrode test piece 2131 to make positive electrode test piece 2131 be difficult to damage, and then improved the security of positive electrode test piece 2131.

Similarly, negative power pin 2122 may include a first negative pin 2122a, a second negative pin 2122b, and a third negative pin 2122c distributed along a circumference of insulating holder 211, and first negative pin 2122a, second negative pin 2122b, and third negative pin 2122c may surround negative test piece 2132. In this scheme, three negative electrode pins can surround negative electrode test piece 2132 to make negative electrode test piece 2132 be difficult to damage, and then improved the security of negative electrode test piece 2132.

In the above embodiment, the second positive electrode lead 2121b may be located between the first positive electrode lead 2121a and the third positive electrode lead 2121c, and the second positive electrode lead 2121b may be used for connection with the electrical connection mechanism of the functional module 300. At least one of the first positive electrode lead 2121a and the third positive electrode lead 2121c is thus integrally formed with the positive electrode test piece 2131. Similarly, a second negative pin 2122b may be located between the first negative pin 2122a and the third negative pin 2122c, and the second negative pin 2122b may be configured to connect with an electrical connection of the functional module 300. At least one of the first negative electrode pin 2122a and the third negative electrode pin 2122c is thus integrally formed with the negative electrode test piece 2132.

In an alternative embodiment, the insulating base 211 may be provided with a socket 211c, where the socket 211c is adapted to be socket-fitted with a mating electrical connection of an electrical connector. The test piece 213 in the present application may be disposed at the bottom of the insertion groove 211 c. In this solution, the test piece 213 is disposed at the bottom of the insertion slot 211c, so that the test piece 213 is not easily damaged, thereby improving the safety and reliability of the test piece 213. In addition, the test piece 213 is located at the bottom of the tank, so that the test piece 213 is prevented from being polluted, and the test through rate and the test production efficiency are further improved.

Specifically, positive electrode test piece 2131 may be positioned on the bottom of the groove near first end 211a and negative electrode test piece 2132 may be positioned on the bottom of the groove near second end 211b. Positive test piece 2131 and negative test piece 2132 may be flush with the bottom of the tank or below the height of the tank bottom.

The test piece 213 of the electrical connector disclosed in the present application may have a semi-arc structure as shown in fig. 1 and 2, or may have a rectangular structure as shown in fig. 3 and 4, or may have other shapes, which is not limited herein.

The electrical connector in the above embodiments may be an integral component, for example, the electrical connector may be directly connected to the functional module 300 or a pin of an electrical device.

In an alternative embodiment, the electrical connector may be only one of the board-to-board connectors 200. Specifically, based on the electrical connector disclosed in the embodiments of the present application, the embodiments of the present application further disclose a board-to-board connector 200, the disclosed board-to-board connection includes a first connector 210 and a second connector 220 that are mutually engaged and connected, and at least one of the first connector 210 and the second connector 220 is the electrical connector described in any of the embodiments above.

The board-to-board connector 200 disclosed herein may be used to make electrical connection between the circuit board 100 and the functional module 300 or the electrical device. Specifically, as shown in fig. 6, the first connector 210 is attached to the circuit board 100, and the second connector 220 is disposed on the functional module 300 or the electrical device. The functional module 300 or the electrical device is electrically connected to the circuit board 100 through the board-to-board connector 200. At this time, the first connector 210 attached to the circuit board 100 may be the electrical connector described in any of the above embodiments. The electrical connector and the second connector 220 are mutually engaged and matched, and the pins of the second connector 220 are correspondingly conducted with the functional pins 212 of the electrical connector.

In the above embodiment, in the board-to-board connector 200 disclosed in the present application, the test piece 213 may be disposed on only one connector of the circuit board 100, or the test piece 213 may be disposed on the other connector of the functional module 300 or the electrical device patch at the same time, and the specific structure is not limited herein.

The test piece 213 is formed on the electric connector by improving the electric connector connected with the circuit board 100, so that the electric connector and the test circuit can share the patch area of the circuit board 100, thereby saving the area of the circuit board 100 and increasing the effective layout space of the circuit board 100.

In addition, the first connector 210 and the second connector 220 are in plug-in fit, so that the test piece 213 on the first connector 210 and the second connector 220 can be shielded between the first connector 210 and the second connector 220, and the test piece 213 can be prevented from being exposed under the condition that the first connector 210 and the second connector 220 are in plug-in fit, and further, the test piece 213 can be prevented from being polluted.

In the above embodiment, in the case of testing the circuit board 100, the first connector 210 and the second connector 220 need to be separated, so that the test piece 213 on the first connector 210 or the second connector 220 is exposed.

Based on the electrical connector disclosed in the embodiments of the present application, the embodiments of the present application further disclose a circuit board assembly, the disclosed circuit board assembly including the electrical connector described in any of the embodiments above.

The circuit board assembly disclosed in the application further comprises a circuit board 100, and the electric connector is pasted on the circuit board 100. The functional pins 212 of the electrical connector are electrically connected to the circuit board 100. The test piece 213 of the electrical connector may be used to electrically connect the external test mechanism 400 in the case of testing the circuit board 100.

In the embodiment disclosed herein, the test piece 213 is formed on the electrical connector, and the test piece 213 is electrically connected to the circuit board 100 through at least one of the functional pins 212 on the electrical connector. At least one pin to which the test piece 213 is electrically connected forms a test circuit for electrically connecting with the external test mechanism 400 when the circuit board 100 is tested. Because the test circuit is disposed on the electrical connector, the test circuit is not required to be disposed on the circuit board 100, so that the layout space of the circuit board 100 can be effectively saved, and the effective layout space of the circuit board 100 can be further increased.

Based on the electrical connector disclosed in the embodiments of the present application, the embodiments of the present application further disclose an electronic device, where the disclosed electronic device includes the electrical connector described in any of the embodiments above.

The electronic device disclosed in the present application further includes a functional module 300 and a circuit board 100, where the functional module 300 may be a battery module, a camera module, a receiver, and the like. Specifically, the electrical connector is attached to the circuit board 100. The functional module 300 is electrically connected to the circuit board 100 through an electrical connector.

In an alternative, the functional module 300 may be extended with electrical connection pins for mating with an electrical connector, which are soldered directly to the functional pins 212 on the electrical connector. The electrical connector is now a separate device.

In another alternative, as shown in fig. 6, the electrical connector disclosed herein is one of the board-to-board connectors 200. Specifically, the board-to-board connector 200 includes a first connector 210 and a second connector 220 that are mated, and the first connector 210 is attached to the circuit board 100. The second connector 220 is electrically connected to the functional module 300. The functional module 300 is electrically connected to the circuit board 100 through the board-to-board connector 200. Wherein the first connector 210 is the electrical connector described in any of the above embodiments. At this time, the electrical connector is one of the board-to-board connectors 200.

The test piece 213 is formed on the electric connector by improving the electric connector connected with the circuit board 100, so that the electric connector and the test circuit can share the patch area of the circuit board 100, thereby saving the area of the circuit board 100 and increasing the effective layout space of the circuit board 100.

In a specific embodiment, as shown in fig. 6, the board-to-board connector 200 may be a battery connector, where the functional module 300 may be a battery module, and includes a battery and a flexible circuit board, where the battery is connected to the flexible circuit board, and the flexible circuit board may be provided with a second connector 220, and the second connector 220 may be mated with the first connector 210 in a plugging manner, so as to implement an electrical connection between the battery and the circuit board 100.

The electronic device disclosed in the embodiments of the present application may be a smart phone, a tablet computer, an electronic book reader, a wearable device (e.g., a smart watch), an electronic game machine, or the like, and the embodiments of the present application do not limit specific types of electronic devices.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims (13)

1. An electrical connector mounted on a circuit board (100), wherein the electrical connector comprises an insulating base (211), functional pins (212) and a test piece (213);

the functional pins (212) and the test piece (213) are both arranged on the insulating base (211), the functional pins (212) are electrically connected with the circuit board (100), at least one pin in the functional pins (212) is electrically connected with the test piece (213), and at least part of the test piece (213) is exposed out of the insulating base (211); the test piece (213) can be used to electrically connect an external test mechanism (400) in the case of testing the circuit board (100).

2. The electrical connector of claim 1, wherein the test piece (213) comprises a positive test piece (2131) and a negative test piece (2132) arranged at intervals, the functional pins (212) comprise a positive power pin (2121) and a negative power pin (2122) arranged at intervals, the positive test piece (2131) being electrically connected to the positive power pin (2121); the negative electrode test piece (2132) is electrically connected to the negative electrode power pin (2122).

3. The electrical connector of claim 2, wherein the electrical connector is a battery connector.

4. The electrical connector of claim 2, wherein the positive power pin (2121) comprises a plurality of positive pins, the positive test piece (2131) being of unitary construction with at least one of the positive pins.

5. The electrical connector of claim 2, wherein the negative power pin (2122) comprises a plurality of negative pins, the negative test piece (2132) being of unitary construction with at least one of the negative pins.

6. The electrical connector of claim 2, wherein the insulating housing (211) has a first end (211 a) and a second end (211 b) arranged along a length direction thereof, the positive power pin (2121) and the positive test piece (2131) are both disposed at the first end (211 a), and the negative power pin (2122) and the negative test piece (2132) are both disposed at the second end (211 b).

7. The electrical connector of claim 6, wherein the functional pins (212) further comprise signal transmission pins (2123), and the positive test piece (2131), the signal transmission pins (2123), and the negative test piece (2132) are arranged at intervals along the length of the insulating housing (211).

8. The electrical connector of claim 2, wherein the positive power pin (2121) comprises a first positive pin (2121 a), a second positive pin (2121 b), and a third positive pin (2121 c) distributed along a circumferential direction of the insulating housing (211), the first positive pin (2121 a), the second positive pin (2121 b), and the third positive pin (2121 c) surrounding the positive test piece (2131).

9. The electrical connector of claim 2, wherein the negative power pin (2122) comprises a first negative pin (2122 a), a second negative pin (2122 b), and a third negative pin (2122 c) distributed along a circumference of the insulating housing (211), the first negative pin (2122 a), the second negative pin (2122 b), and the third negative pin (2122 c) surrounding the negative test piece (2132).

10. The electrical connector according to claim 1, wherein the insulating housing (211) is provided with a socket (211 c), and the test piece (213) is disposed at a bottom of the socket (211 c).

11. A board-to-board connector, characterized in that the board-to-board connector (200) comprises a first connector (210) and a second connector (220) which are connected to each other in a fitting manner, at least one of the first connector (210) and the second connector (220) being the electrical connector according to any one of claims 1 to 10.

12. A circuit board assembly comprising a circuit board (100) and an electrical connector according to any one of claims 1 to 10, said electrical connector being attached to said circuit board (100), functional pins (212) of said electrical connector being electrically connected to said circuit board (100), a test piece (213) of said electrical connector being adapted to electrically connect to an external test mechanism (400) in case of testing said circuit board (100).

13. An electronic device characterized by comprising a functional module (300), a circuit board (100) and an electrical connector according to any of claims 1 to 10; the electric connector is attached to the circuit board (100), and the functional module (300) is electrically connected with the circuit board (100) through the electric connector.