Power connector

Abstract

The present invention relates to a power connector comprising an insulative housing and at least one power contact pair. The power contact pair is fixed in the receiving slot of the insulative housing, each power contact pair comprises an upper row of contact assembly and a lower row of contact assembly, with their contacting arms oppositely arranged in a height direction. Each of the upper row of contact assembly and the lower row of contact assembly comprises a first contact and a second contact. Each of the first and second contacts has a base portion and at least one contacting arm extending forward from the base portion. A width of the base portions of the first and second contacts in a transverse direction is not less than

Description

Technical Field

[0001] This invention relates to a power connector. Prior Technology

[0002] Traditional power connectors have an insulating body and a plurality of power terminal pairs fixed within the insulating body. Each power terminal has a base portion and at least one elastic contact arm extending forward from the base portion. However, when the power terminal transmits a larger current, the power terminal is prone to excessive heat generated by the current impedance due to the limited conductor path, which exceeds the temperature range that the power connector can withstand, making it difficult to meet the usage requirements of high-power environments.

[0003] In view of this, it is indeed necessary to make further improvements to traditional power connectors to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a power connector that can increase conductor passage within a limited width range and suppress heat generation at the power terminals.

[0005] To achieve the above objectives, the present invention provides a power connector comprising an insulating body and at least one power terminal pair. The insulating body has a terminal groove extending in a front-rear direction, and the power terminal pair is fixed within the terminal groove of the insulating body. Each power terminal pair includes an upper row terminal assembly and a lower row terminal assembly with contact arms disposed opposite each other in the height direction. Each of the upper row terminal assembly and the lower row terminal assembly includes a first terminal and a second terminal. Each of the first terminal and the second terminal has a base portion and at least one contact arm extending forward from the base portion. The width of the base portion of the first and second terminals in the lateral direction is not less than 10% of the width of the insulating body in the lateral direction.

[0006] Furthermore, the width of the base portion of the aforementioned first and second terminals in the transverse direction is not less than 30% of the width of the aforementioned insulating body in the transverse direction.

[0007] Furthermore, the contact arms of each of the aforementioned upper and lower terminal assemblies are arranged in at least two groups side by side in the lateral direction, and the distance between two adjacent groups of contact arms is greater than the distance between two adjacent contact arms in the same group.

[0008] Furthermore, the contact arms of each of the aforementioned first terminal and second terminal are arranged in at least two groups side by side in the lateral direction, and the distance between two adjacent groups of contact arms in the lateral direction is greater than the distance between two adjacent contact arms in the same group.

[0009] Furthermore, each of the aforementioned terminal slots is provided with at least one partition wall, which separates two adjacent sets of contact arms in the lateral direction.

[0010] Furthermore, the aforementioned insulating body has a transverse wall extending in the transverse direction, which divides the terminal slot into two groups corresponding to the upper row of terminal assemblies and the lower row of terminal assemblies, respectively. Each of the aforementioned partition walls extends in the front-back direction and has a connecting portion connected to the aforementioned transverse wall.

[0011] Furthermore, the aforementioned second terminal is provided with a recessed groove formed in a rearward direction. The groove is formed in a rearward direction from the front end of the aforementioned base portion, and the aforementioned connecting portion is inserted into the groove in a rearward direction.

[0012] Furthermore, each of the aforementioned partition walls includes a first partition located on the front side of the aforementioned connecting portion and a second partition located on the rear side of the aforementioned connecting portion. The aforementioned second partition is inserted rearward into the gap space in the height direction of the base portion of the corresponding first and second terminals, so that the aforementioned base portion is sandwiched in the height direction by two adjacent of the aforementioned second partition, the aforementioned transverse wall, the top wall of the aforementioned insulating body, and the bottom wall of the aforementioned insulating body.

[0013] Furthermore, in the same terminal assembly, at least a portion of the contact arm of the aforementioned second terminal extends into the gap between two adjacent contact arms of the first terminal.

[0014] To achieve the above objectives, the present invention also provides a power connector, comprising an insulating body and at least one power terminal pair. The insulating body has a power transmission cavity for receiving the power terminal pair. The power terminal pair is fixed in a terminal slot of the insulating body. The power transmission cavity is connected to the terminal slot. Each power terminal pair includes an upper row terminal assembly and a lower row terminal assembly with contact arms disposed opposite each other in the height direction. Each of the upper row terminal assembly and the lower row terminal assembly includes a first terminal and a second terminal. Each of the first terminal and the second terminal has a base portion and at least one contact arm extending forward from the base portion. The width of the base portion of the first and second terminals in the lateral direction is not less than 15% of the width of the power transmission cavity in the lateral direction.

[0015] Compared to conventional technology, the power connector of the present invention increases the relative area of ​​each terminal assembly in the lateral direction by setting the width of the base portion of the first and second terminals in the lateral direction to be no less than 10% of the width of the aforementioned insulating body in the lateral direction or no less than 15% of the width of the aforementioned power transmission cavity in the lateral direction. This effectively increases the conductive path of the terminal assembly within a limited width range, suppresses the heating of the power terminals, and enhances the current carrying capacity of the power connector, thereby meeting the requirements of high-power applications. Simple Explanation of the Diagram

[0016] The first figure is a three-dimensional assembly diagram of the power connector of the present invention. The second figure is a view of the power connector shown in the first figure from another perspective. The third figure is an exploded perspective view of the power connector shown in the first figure. Figure 4 is a partial exploded view of one of the terminal assemblies of the power connector shown in Figure 3. Figure 5 is a further exploded view of the terminal assembly shown in Figure 4. Figure 6 is a top view of one of the terminal assemblies of the power connector shown in Figure 3. Figure 7 is a top view of the first terminal in the upper row of terminals of the power connector shown in Figure 3. Figure 8 is a partial enlarged view of the insulating body of the power connector shown in Figure 3. Figure 9 is a cross-sectional view of the insulating body of the power connector shown in Figure 3. Figure 10 is a cross-sectional view of the power connector shown in Figure 1. Figure 11 is another cross-sectional view of the power connector shown in Figure 1. Implementation

[0017] Please refer to Figures 1 to 11 for a preferred embodiment of the power connector 100 of the present invention. In some embodiments of the present invention, the aforementioned power connector 100 includes an insulating body 1 and at least one power terminal pair 2, wherein the aforementioned power terminal pair 2 is fixed in the aforementioned insulating body 1.

[0018] For ease of explanation, when describing the power connector 100 below, we will consider the mating direction of the power connector 100 as the front-back direction, one direction perpendicular to the aforementioned front-back direction as the lateral direction, and the other direction perpendicular to the aforementioned front-back direction as the height direction.

[0019] Please refer to Figures 1 to 3 and Figures 8 to 11. The aforementioned insulating body 1 has a terminal slot 101 extending in the front-back direction, and the aforementioned power terminal pair 2 is fixed in the terminal slot 101 of the aforementioned insulating body 1.

[0020] As shown in Figures 8 and 9, in this invention, each of the aforementioned terminal slots 101 is provided with at least one partition wall 102 to divide each terminal slot 101 into at least two terminal channels 1012. In the embodiments shown in this application, each terminal slot 101 is provided with two of the aforementioned partition walls 102 to divide one terminal slot 101 into three terminal channels 1012. In other embodiments, each terminal slot 101 may also be divided into two, four or more terminal channels 1012 by partition walls 102.

[0021] The aforementioned insulating body 1 has a transverse wall 103 extending in the transverse direction, which divides the terminal slot 101 into upper and lower groups. Each of the aforementioned partition walls 102 extends in the front-back direction and has a connecting portion 1021 connected to the aforementioned transverse wall 103.

[0022] Each of the aforementioned partition walls 102 includes a first partition 1022 located on the front side of the aforementioned connecting portion 1021 and a second partition 1023 located on the rear side of the aforementioned connecting portion 1021. The aforementioned first partition 1022 is integrally connected to the top wall 104 or bottom wall 105 of the aforementioned insulating body 1.

[0023] Furthermore, the front end of the aforementioned second spacing portion 1023 is connected to the aforementioned connecting portion 1021 and has a cantilever structure extending rearward. The aforementioned second spacing portion 1023 has a vertically placed flat plate structure, that is, its width in the lateral direction is smaller than its height in the vertical direction.

[0024] As shown in Figures 9 and 11, the aforementioned first spacer 1022 has a guide surface 1024 on the front side and an extension surface 1025 on the rear side. The guide surface 1024 is inclined at an angle to the horizontal plane, and the extension surface 1025 is parallel to the horizontal plane. The extension length of the guide surface 1024 in the front-rear direction is greater than the extension length of the extension surface 1025 in the front-rear direction, so as to achieve a better guiding effect on the front side, thereby adapting to the increased width of the base portion 202.

[0025] In the height direction, the distance between the aforementioned extended surface 1025 and the aforementioned transverse wall 103 is smaller than the distance between the corresponding second interval 1023 and the aforementioned transverse wall 103, thereby increasing the arc creep distance at the corresponding position of the contact arm 201 of the power terminal and ensuring the safety and reliability of the electrical connection.

[0026] The rear end face of the aforementioned first spacing portion 1022 is located between the front end face and the rear end face of the aforementioned connecting portion 1021 in the front-rear direction. The second spacing portion 1023 located on the upper side extends rearward to be flush with the aforementioned top wall 104. The rear end face of the aforementioned transverse wall 103 is flush with the rear end face of the aforementioned top wall 104. The second spacing portion 1023 located on the lower side extends rearward to be flush with the aforementioned bottom wall 105.

[0027] The aforementioned transverse wall 103 has a notch 1031 located on its lower side. The notch 1031 is formed by a recess from the rear end of the aforementioned transverse wall 103 towards the front. In the front-back direction, the notch 1031 is located on the rear side of the aforementioned bottom wall 105.

[0028] Please refer to Figures 1 to 7 and Figures 10 to 11. Each power terminal pair 2 includes a contact arm 201 with an upper row terminal assembly 2a and a lower row terminal assembly 2b disposed opposite each other along the height direction. The aforementioned transverse wall 103 divides the terminal slot 101 into two groups corresponding to the upper row terminal assembly 2a and the lower row terminal assembly 2b, respectively.

[0029] Each of the aforementioned upper terminal assembly 2a and lower terminal assembly 2b includes a first terminal 21 and a second terminal 22. Each of the aforementioned first terminal 21 and second terminal 22 has a base portion 202 and at least one of the aforementioned contact arms 201 extending forward from the base portion 202.

[0030] In this embodiment, the aforementioned base portion 202 has an interference portion 2021 fixed to the insulating body 1, and the aforementioned interference portion 2021 is disposed on both sides of the aforementioned base portion 202 in the lateral direction.

[0031] Each of the aforementioned upper row terminal assembly 2a and lower row terminal assembly 2b is referred to as a terminal assembly, and each of the aforementioned first and second terminals 21 and 22 is referred to as a power terminal, and each power terminal is a sheet-like structure extending in the lateral direction. In this invention, the aforementioned base portion 202 is the part with the greatest width in the lateral direction for each power terminal.

[0032] In this invention, in each terminal assembly, the base portion 202 of the first terminal 21 is disposed close to the transverse wall 103 in the height direction, and the base portion 202 of the second terminal 22 is disposed away from the transverse wall 103 in the height direction.

[0033] In this embodiment, each of the first terminal 21 and the second terminal 22 further has an extension 203 formed by bending and extending from the base portion 202, and the extension 203 is located on the rear side of the base portion 202. Additionally, each of the first and second terminals 21 and 22 further has a solder foot 204 extending downward from the extension 203, and the extension direction of the solder foot 204 is perpendicular to the extension direction of the contact arm 201.

[0034] As shown in Figures 4 and 10, the width W1 of the base portion 202 of the aforementioned first and second terminals 21 and 22 in the lateral direction is not less than 10% of the width W2 of the aforementioned insulating body 1 in the lateral direction. By making the width of the base portion 202 of the aforementioned power terminal wider in the lateral direction, the conductor area is increased, thereby effectively increasing the conductive path of the terminal assembly and suppressing the heating of the power terminal.

[0035] Furthermore, the width W1 of the base portion 202 of the aforementioned first and second terminals 21 and 22 in the lateral direction is not less than 20% of the width W2 of the aforementioned insulating body 1 in the lateral direction, thereby increasing the cross-sectional area of ​​the power terminal, reducing resistance, reducing heat generation, and effectively improving the current carrying capacity of the power terminal.

[0036] Furthermore, in a preferred embodiment of the present invention, the width W1 of the base portion 202 of the aforementioned first and second terminals 21 and 22 in the lateral direction is not less than 30% of the width W2 of the aforementioned insulating body 1 in the lateral direction. By maximizing the width of the aforementioned power terminals in the lateral direction, the conductive path is increased, and the heating of the power terminals is effectively suppressed.

[0037] As shown in Figures 3 to 6, the contact arms 201 of each of the aforementioned upper terminal assembly 2a and lower terminal assembly 2b are arranged in at least two groups side by side in the lateral direction, as shown in Figure 6. Each group of contact arms 201 is marked as G in Figure 6. The distance between two adjacent groups of contact arms 201 is greater than the distance between two adjacent contact arms 201 in the same group.

[0038] This application increases the conductor area of ​​each terminal assembly in the lateral direction by configuring each terminal assembly to have at least two sets of contact arms 201 and a base portion 202 connected to the aforementioned at least two sets of contact arms 201, thereby effectively increasing the conductive path of the terminal assembly and suppressing the heating of the power terminals.

[0039] In this embodiment, the aforementioned partition wall 102 separates two adjacent sets of contact arms 201 in the lateral direction. Specifically, the aforementioned first partition 1022 separates two adjacent sets of contact arms 201 of the same terminal assembly in the lateral direction. The aforementioned notch 1031 is provided at a position corresponding to the bent portion of the second terminal 22 of the lower row terminal assembly 2b, thereby making the assembly process smoother and preventing the bent portion from interfering with the lateral wall 103.

[0040] Please refer to Figures 5 and 7. The contact arms 201 of each of the aforementioned first terminal 21 and second terminal 22 are arranged in at least two groups side by side in the lateral direction. Each group of contact arms 201 in each power terminal is marked as g in Figure 7. As shown in Figure 7, the distance D1 between two adjacent groups of contact arms 201 in the lateral direction is greater than the distance D2 between two adjacent contact arms 201 in the same group. This allows the contact arms 201 of the aforementioned first and second terminals 21 and 22 to be arranged in at least two groups after the terminal assembly is formed, and to be cross-arranged to achieve balanced insertion and extraction forces.

[0041] In some embodiments of the present invention, the aforementioned second terminal 22 is provided with a recessed groove 205, which is formed by recessing backward from the front end of the aforementioned base portion 202, and the aforementioned connecting portion 1021 is inserted backward into the aforementioned groove 205.

[0042] In the embodiment shown in this invention, the aforementioned first terminal 21 also has a groove 205 formed by recessing from the front end of its base portion 202 to the rear. The aforementioned first spacer portion 1022 is inserted rearward into the groove 205 of the aforementioned first terminal 21 to further limit the aforementioned power terminal in the lateral direction.

[0043] The aforementioned second spacer 1023 is inserted rearward into the space between the base portions 202 of the corresponding first and second terminals 21 and 22 in the height direction, so that the aforementioned base portions 202 are clamped in the height direction by two adjacent of the aforementioned second spacer 1023, the aforementioned transverse wall 103, the aforementioned top wall 104 of the aforementioned insulating body 1, and the aforementioned bottom wall 105 of the aforementioned insulating body 1, thereby further limiting the aforementioned power terminals in the height direction.

[0044] In the aforementioned upper terminal assembly 2a, the base portion 202 of the first terminal 21 is sandwiched between the top wall of the aforementioned insulating body 1 and the aforementioned second spacer portion 1023 in the height direction, and the base portion 202 of the second terminal 22 in the aforementioned upper terminal assembly 2a is sandwiched between the aforementioned second spacer portion 1023 and the aforementioned transverse wall 103 in the height direction.

[0045] In the aforementioned lower terminal assembly 2b, the base portion 202 of the first terminal 21 is sandwiched between the aforementioned second spacer portion 1023 and the bottom wall of the aforementioned insulating body 1 in the height direction, and the base portion 202 of the second terminal 22 in the aforementioned lower terminal assembly 2b is sandwiched between the aforementioned second spacer portion 1023 and the aforementioned transverse wall 103 in the height direction.

[0046] In some embodiments of the power connector 100 of the present invention, the aforementioned insulating body 1 has a power transmission cavity 10 that accommodates the aforementioned power terminal pair 2. The aforementioned power transmission cavity 10 is connected to the aforementioned terminal slot 101. As shown in Figure 10, the width W1 of the base portion 202 of the aforementioned first and second terminals 21 and 22 in the lateral direction is not less than 15% of the width W3 of the aforementioned power transmission cavity 10 in the lateral direction.

[0047] Thus, by setting the width W1 of the base portion 202 of the power terminal in the lateral direction to be no less than 15% of the width W3 of the power transmission cavity in the lateral direction, the power connector 100 of the present invention can provide a single power terminal as wide as possible within the limited width range of the power transmission cavity 10, thereby increasing the conductive path and suppressing the heat generation of the power terminal.

[0048] Furthermore, the width W1 of the base portion 202 of the aforementioned first and second terminals 21 and 22 in the lateral direction is not less than 30% of the width W3 of the aforementioned power transmission cavity 10 in the lateral direction, thereby providing a wider range of single power terminals within the limited width range of the power transmission cavity 10, and thus more effectively improving the current carrying capacity of the power terminals.

[0049] Furthermore, the width W1 of the base portion 202 of the aforementioned first and second terminals 21 and 22 in the lateral direction is not less than 45% of the width W3 of the aforementioned power transmission cavity 10 in the lateral direction, thereby providing a single power terminal as wide as possible within the limited width range of the power transmission cavity 10, and thus more effectively improving the current carrying capacity of the power terminal.

[0050] In this embodiment, in the same terminal assembly, at least a portion of the contact arm 201 of the aforementioned second terminal 22 extends into the gap between two adjacent contact arms 201 of the first terminal 21.

[0051] Specifically, as shown in Figures 3 and 4, in some embodiments, the contact arms 201 of the first and second terminals 21 and 22 are arranged alternately in the same terminal assembly; in other embodiments, the contact arms 201 of the second terminal 22 may be divided into two groups spaced apart in the lateral direction, and the contact arms 201 of the first terminal 21 may be arranged in the lateral direction between the two groups of contact arms 201 of the second terminal 22; in other embodiments, in the same terminal assembly, the contact arms 201 of the first terminal 21 may be arranged adjacent to each other, and the contact arms 201 of the second terminal 22 may be arranged adjacent to each other, with the contact arms 201 of the first terminal 21 located on one side of the contact arms 201 of the second terminal 22 in the lateral direction.

[0052] In some embodiments of the present invention, the aforementioned insulating body 1 further has a plurality of heat dissipation channels 106 formed on its top wall, the aforementioned heat dissipation channels 106 penetrating the aforementioned top wall along the height direction, so as to dissipate the heat generated by the power terminal pair 2 being energized as quickly as possible.

[0053] In this invention, the aforementioned power connector 100 also has a plurality of signal terminals 3 located on one side of the aforementioned power terminal pair 2 in the lateral direction, each of the aforementioned signal terminals 3 having a mating arm 31 and a soldering portion 32.

[0054] In another embodiment of the power connector 100 of the present invention, similar to the previous embodiment, the power connector 100 includes an insulating body 1 and at least one power terminal pair 2. The insulating body 1 has a terminal groove 101 extending in the front-rear direction. The power terminal pair 2 is fixed in the terminal groove 101 of the insulating body 1. Each power terminal pair 2 includes an upper row terminal assembly 2a and a lower row terminal assembly 2b arranged opposite each other in the height direction with contact arms 201. Each of the upper row terminal assembly 2a and the lower row terminal assembly 2b includes a first terminal 21 and a second terminal 22. Each of the first terminal 21 and the second terminal 22 has a base portion 202 and at least one of the aforementioned contact arms 201 extending forward from the base portion 202.

[0055] The difference is that in this modified embodiment, in the same terminal combination 2a, 2b, each of the aforementioned first and second terminals 21, 22 has only one set of contact arms 201, that is, each contact arm 201 is evenly arranged in the lateral direction, that is, in the lateral direction, the distance between two adjacent contact arms 201 is equal; instead of having at least two sets of contact arms 201 as in the first embodiment of the first and second terminals 21, 22.

[0056] The power connector 100 of the present invention increases the relative area of ​​each terminal combination 2a, 2b in the lateral direction by setting the width of the base portion 202 of the first and second terminals 21, 22 in the lateral direction to be no less than 10% of the width of the aforementioned insulating body 1 in the lateral direction or no less than 15% of the width of the aforementioned power transmission cavity 10 in the lateral direction. This effectively increases the conductive path of the terminal combination within a limited width range, suppresses the heating of the power terminals, and enhances the current carrying capacity of the power connector, thereby meeting the requirements of high power applications.

[0057] It should be particularly noted that, for those skilled in the art, any equivalent modifications made to this invention under the guidance of its teachings should still be included within the scope claimed in the claims of this invention.

[0058] 100: Power connector 1: Insulating body 10: Power transmission cavity 101: Terminal slot 1012: Terminal Channel 102: Spacer 1021: Connecting part 1022: First Interval 1023: Second Interval 1024: Guiding Surface 1025: Extended surface 103: Transverse wall 1031: Missing part 104: Top Wall 105: Bottom wall 106: Heat dissipation channel 2: Power terminal pair 201: Contact Arm 202: Base part 2021: Interference Department 203: Extension 204: Solder foot 205: Groove 2a: Upper row terminal assembly 2b: Lower row terminal assembly 21: First terminal 22: Second terminal 3: Signal Terminal 31: Docking arm 32: Welding section

Claims

1. A power connector comprising an insulating body and at least one power terminal pair, wherein the insulating body has a terminal groove extending in a front-rear direction, the power terminal pair is fixed within the terminal groove of the insulating body, each power terminal pair comprising an upper row terminal assembly and a lower row terminal assembly with contact arms disposed opposite each other in a height direction, each of the upper row terminal assembly and the lower row terminal assembly comprising a first terminal and a second terminal, each of the first terminal and the second terminal having a base portion and at least one contact arm extending forward from the base portion; wherein the width of the base portion of the first and second terminals in the lateral direction is not less than 10% of the width of the insulating body in the lateral direction, the contact arms of each of the upper row terminal assembly and the lower row terminal assembly are arranged in at least two groups arranged side by side in the lateral direction, and the distance between two adjacent groups of contact arms in each of the upper row terminal assembly and the lower row terminal assembly is greater than the distance between two adjacent contact arms in the same group.

2. The power connector as described in claim 1, wherein the width of the base portion of the aforementioned first and second terminals in the lateral direction is not less than 30% of the width of the aforementioned insulating body in the lateral direction.

3. The power connector as described in claim 1, wherein the contact arms of each of the aforementioned first terminal and second terminal are arranged in at least two groups arranged side by side in the lateral direction, and the distance between two adjacent groups of contact arms in the lateral direction is greater than the distance between two adjacent contact arms in the same group.

4. The power connector as described in claim 1, wherein each of the aforementioned terminal slots is provided with at least one spacer wall, the aforementioned spacer wall separating two adjacent sets of contact arms in the lateral direction.

5. The power connector as described in claim 4, wherein the aforementioned insulating body has a transverse wall extending in a transverse direction, the transverse wall dividing the terminal slot into two groups corresponding to the upper row of terminal assemblies and the lower row of terminal assemblies respectively, and each of the aforementioned partition walls extending in a front-rear direction and having a connecting portion connected to the aforementioned transverse wall.

6. The power connector as described in claim 5, wherein the second terminal is provided with a recessed groove formed in a rearward direction, the groove being formed in a rearward direction from the front end of the base portion, and the connecting portion being inserted rearward into the groove.

7. The power connector as described in claim 5, wherein each of the aforementioned spacers includes a first spacer located on the front side of the aforementioned connection portion and a second spacer located on the rear side of the aforementioned connection portion, wherein the aforementioned second spacer is inserted rearward into the gap space in the height direction of the base portion of the corresponding first and second terminals, such that the aforementioned base portion is clamped in the height direction by two adjacent of the aforementioned second spacer, the aforementioned transverse wall, the top wall of the aforementioned insulating body, and the bottom wall of the aforementioned insulating body.

8. A power connector as described in any one of claims 1 to 7, wherein in the same terminal assembly, at least a portion of the contact arm of the aforementioned second terminal extends into the gap between two adjacent contact arms of the first terminal.

9. A power connector comprising an insulating body and at least one power terminal pair, wherein the insulating body has a power transmission cavity for receiving the power terminal pair, the power terminal pair is fixed in a terminal slot of the insulating body, the power transmission cavity is connected to the terminal slot, each power terminal pair includes an upper row terminal assembly and a lower row terminal assembly with contact arms disposed opposite each other in the height direction, each of the upper row terminal assembly and the lower row terminal assembly includes a first terminal and a second terminal, each of the first terminal and the second terminal having a base portion and at least one contact arm extending forward from the base portion; wherein the width of the base portion of the first and second terminals in the lateral direction is not less than 15% of the width of the power transmission cavity in the lateral direction, and the contact arms of each of the upper row terminal assembly and the lower row terminal assembly are arranged in at least two groups arranged side by side in the lateral direction, the spacing between two adjacent groups of contact arms being greater than the spacing between two adjacent contact arms in the same group.

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