A wire-to-board power connector with terminal unit positioning structure

Abstract

This invention relates to a wire-to-board power connector with a terminal unit positioning structure, comprising a housing, terminal units mounted on the housing, and a positioning member for limiting the position of the terminal units. The positioning member has a main body, a limiting hole and a fixing part provided on the main body. The limiting hole is a through hole, and one end of the terminal unit protruding from the housing passes through the limiting hole and connects to an external circuit board assembly. The positioning member is mounted on the housing via the fixing part. The fixing part has two fixing arms, which are located at both ends of the main body. Each fixing arm has a fixing block protruding from its end away from the main body. The two fixing arms abut against the outer walls of the housing on opposite sides. The fixing blocks are used to prevent the positioning member from shifting. The connector structure of this invention is stable and can prevent the positioning member from shifting.

Description

Technical Field

[0001] This invention relates to the field of connector technology, and in particular discloses a wire-to-board power connector with a terminal unit positioning structure. Background Technology

[0002] In the field of online board connectors, pin positioning blocks are key components ensuring reliable soldering between terminals and PCB boards. In existing connectors, pin positioning blocks are mostly connected to the housing via a simple snap-fit ​​structure, a method with significant shortcomings. For example, the snap-fit ​​structure of the pin positioning block to the housing disclosed in invention patent application number 202410773601.X is prone to slight displacement or deformation of the positioning block due to external stress when the terminal is inserted into the board, reducing connection stability. Simultaneously, the positioning block itself lacks structural strength, making it difficult to effectively constrain the soldering portions of multiple rows of L-shaped terminals, potentially causing misalignment between the terminals and PCB pads, affecting connection reliability, and compromising production efficiency by failing to ensure precise insertion. Current designs fail to fundamentally address these strength and stability issues, limiting connector performance in high-density applications. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a wire-to-board power connector with a terminal unit positioning structure.

[0004] To achieve the above objectives, the present invention provides a wire-to-board power connector with a terminal unit positioning structure, comprising a housing, a terminal unit mounted on the housing, and a positioning member for limiting the position of the terminal unit; the positioning member has a main body, a limiting hole and a fixing part provided on the main body, the limiting hole being a through hole, one end of the terminal unit protruding from the housing passing through the limiting hole and connected to an external circuit board assembly, the positioning member being mounted on the housing via the fixing part; the fixing part has two fixing arms, the two fixing arms being located at both ends of the main body, each fixing arm having a fixing block protruding from the end away from the main body, the two fixing arms abutting against the outer walls of the housing on opposite sides, the fixing block being used to prevent the positioning member from retracting.

[0005] Preferably, the fixing block has a first insertion slope to facilitate the installation of the positioning component.

[0006] Preferably, the two fixing blocks are close to each other, and the first insertion ramps of the two fixing blocks are close to each other.

[0007] Preferably, the limiting hole has a second insertion bevel to facilitate the insertion of the terminal unit.

[0008] Furthermore, the housing has two protruding side plates, and the portion of the terminal unit protruding from the housing is located between the two side plates; each side plate has a first groove recessed from one end surface, and the two ends of the main body enter the two first grooves respectively; the two fixing arms are respectively attached to the outer walls of the two side plates, and each fixing block abuts against the end face of the other end of the corresponding side plate; each side plate has a protruding rib on its outer wall, and each fixing arm has a corresponding groove that cooperates with the rib.

[0009] Preferably, each groove extends toward the corresponding fixing block and penetrates the fixing block.

[0010] Preferably, each first groove body has a third insertion ramp on its side arm to facilitate the installation of the main body.

[0011] Furthermore, the main body also has a first protrusion and a second protrusion, which are located at opposite ends of the main body and are positioned between two fixed arms. A second groove is provided at one end of the housing near the first groove, and the second protrusion is used in conjunction with the second groove. Each of the two first grooves has a groove arm, and the first protrusion is located between the two groove arms. The two ends of the first protrusion extend toward the two groove arms and abut against them.

[0012] Preferably, the central axes of the first protrusion and the second protrusion are aligned, and the first protrusion, the second protrusion, and the main body form a cross-shaped structure.

[0013] Preferably, the second protrusion extends into the cavity, and the second protrusion is provided with a positioning post, and the external circuit board assembly has a positioning hole that mates with the positioning post.

[0014] Furthermore, a protruding edge is provided at one end of the main body near the shell, with both ends of the protruding edge extending toward the two first grooves and passing through the first grooves. The protruding edge is located between the second protrusion and the main body.

[0015] Preferably, the second protrusion is formed from the end of the protrusion away from the main body.

[0016] Preferably, the central axis of the protruding edge is aligned with the central axis of the second protrusion.

[0017] Furthermore, the portion of the terminal unit protruding from the housing is bent and extended toward the positioning member to form a bent portion, which is located between the two side plates; the end of the bent portion has a connecting portion, the thickness of the end of the connecting portion away from the bent portion is less than the thickness of the end of the connecting portion near the bent portion; the end of the bent portion with the connecting portion extends out of the positioning member through a limiting hole, and the connecting portion is used for electrical connection with an external circuit board assembly.

[0018] Furthermore, the housing has a mounting groove, and the terminal unit is mounted on the housing via the mounting groove; the terminal unit is provided with a limiting part protruding at the part of the mounting groove, and the mounting groove is recessed from the groove wall to provide a third groove that cooperates with the limiting part.

[0019] Preferably, the mounting slot has a notch, through which the terminal unit is inserted into the mounting slot.

[0020] Preferably, there are two limiting parts, which are located on both sides of the terminal unit and are far apart from each other. There are also two third grooves.

[0021] Preferably, the limiting part has a first locking block and a second locking block, the first locking block has a fourth insertion inclined surface, the second locking block has a fifth insertion inclined surface, and the length of the fifth insertion inclined surface is greater than the length of the fourth insertion inclined surface.

[0022] Furthermore, the terminal unit located in the mounting groove has a connecting cavity, an elastic contact arm protruding into the connecting cavity, and a contact block, with the elastic contact arm and the contact block being arranged opposite to each other; the housing has a socket that communicates with the mounting groove, and an external connector extends into the connecting cavity through the socket and is sandwiched between the contact block and the elastic contact arm; both ends of the elastic contact arm are provided with lugs, and the connecting cavity has two fourth grooves recessed from its inner wall, with the two lugs movably located in the fourth grooves respectively.

[0023] Preferably, the elastic contact arm is inclinedly disposed in the connecting cavity, and the end of the elastic contact arm has a contact portion with a contact plane, and two lugs are respectively located at both ends of the contact portion.

[0024] Preferably, the fourth groove is a through groove.

[0025] Preferably, the terminal unit is formed by pressing a metal sheet. One end of the metal sheet has a protrusion, and the two ends of the metal sheet are connected to form a connecting cavity. The top wall of the connecting cavity is recessed into the cavity to form a recessed part. One side of the recessed part is concave, the protrusion extends into the recessed part, and the other side of the recessed part is convex to form a contact block.

[0026] Preferably, the socket has an insertion bevel.

[0027] Furthermore, the housing has a first body and a second body, a terminal unit is mounted on the first body, a positioning member is mounted on the second body, and the portion of the terminal unit protruding from the housing bends and extends toward the second body and passes through the positioning member.

[0028] Preferably, the mounting groove is located in the first body portion, and the two side plates are located in the second body portion.

[0029] Furthermore, it also includes a locking member, which has a body portion and a stop arm and a locking arm provided on the body portion; the stop arm is used to prevent the terminal unit from retracting; a locking block protrudes from one side of the locking arm, the second body portion has a cavity and a mounting hole communicating with the cavity, the locking arm extends into the cavity through the mounting hole, and the locking block abuts against the inner wall of the cavity; there are two locking arms, each of the two locking arms has a locking block, and the two locking blocks are far apart from each other.

[0030] Preferably, the first body has a mounting cavity and a first slot and a second slot communicating with the mounting cavity. The first slot and the second slot are located on both sides of the mounting cavity, and the mounting cavity is connected to the mounting slot. The stop arm enters the mounting cavity through the first slot and extends out of the mounting cavity through the second slot. The arm of the stop arm abuts against the terminal unit in the mounting slot to prevent the terminal unit from retracting.

[0031] Preferably, the stop arm abuts against the upper part of the cavity opening of the connecting cavity, and the bent part of the terminal unit extends out of the housing from below the stop arm.

[0032] Preferably, the stop arm has a sixth insertion ramp to facilitate the installation of the stop arm.

[0033] Preferably, the locking block has a seventh insertion ramp to facilitate the locking block's entry into the cavity. Furthermore, the two ends of the main body are respectively provided with abutment ribs, and the two ends of each abutment rib extend along the length direction of the main body. One end of each abutment rib is connected to the corresponding locking arm, and the other ends of the two abutment ribs are located on both sides of the stop arm. The two abutment ribs are used to abut against the outer wall of the second body.

[0034] The beneficial effects of the present invention are as follows: The main body of the positioning component of the present invention forms a cross-shaped structure with the first protrusion and the second protrusion. The second groove of the housing and the two groove arms of the first groove form a cross-shaped slot. The cross-shaped structure and the cross-shaped slot are interlocked, resulting in a stable structure. The groove on the fixing arm cooperates with the protruding rib of the side plate to prevent the buckle from shifting and increase the strength and stability of the connection. In addition, the positioning component is provided with a positioning post that cooperates with the external circuit board assembly, which can reduce the influence of external forces on the positioning component and increase stability. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the usage state structure of a wire-to-board power connector with a terminal unit positioning structure according to the present invention. Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is an exploded structural diagram of the present invention; Figure 4 This is a schematic diagram of the shell structure of the present invention; Figure 5This is a structural schematic diagram of the housing of the present invention from another perspective; Figure 6 This is a schematic diagram of the positioning component of the present invention; Figure 7 This is a schematic diagram of the longitudinal cross-sectional structure of the present invention; Figure 8 This is a schematic diagram of the transverse cross-sectional structure of the present invention.

[0036] The reference numerals in the accompanying drawings include: 1. Housing; 11. First body portion; 12. Second body portion; 121. Cavity; 122. Mounting hole; 13. Side plate; 131. First groove; 1311. Groove arm; 132. Rib; 133. Second groove; 14. Mounting groove; 141. Third groove; 142. Groove opening; 15. Insertion hole; 16. Mounting cavity; 161. First hole groove; 162. Second hole groove; 2. Terminal unit; 21. Bending portion; 22. Connecting portion; 23. Limiting portion; 231. First locking block; 232. Second locking block; 2 4. Connecting cavity; 241. Elastic contact arm; 2411. Lug; 242. Contact block; 243. Fourth groove; 25. Locking protrusion; 3. Positioning component; 31. Main body; 311. Limiting hole; 312. Fixing arm; 313. Fixing block; 314. Groove; 315. First protrusion; 316. Second protrusion; 317. Protruding edge; 32. Positioning post; 4. Locking component; 41. Main body; 42. Stop arm; 43. Locking arm; 431. Locking block; 44. Abutment rib; 5. External circuit board assembly; 6. External connector. Detailed Implementation

[0037] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0038] Please see Figures 1 to 8 As shown, a wire-to-board power connector with a terminal unit positioning structure according to the present invention includes a housing 1, a terminal unit 2 mounted on the housing 1, and a positioning member 3 for limiting the position of the terminal unit 2. The positioning member 3 has a main body 31, a limiting hole 311 and a fixing part provided on the main body 31. The limiting hole 311 is a through hole. One end of the terminal unit 2 protruding from the housing 1 passes through the limiting hole 311 and is connected to an external circuit board assembly 5. The positioning member 3 is mounted on the housing 1 via the fixing part. The fixing part has two fixing arms 312, which are located at both ends of the main body 31. Each fixing arm 312 has a fixing block 313 protruding from one end away from the main body 31. The two fixing arms 312 abut against the outer walls of the housing 1 on opposite sides. The fixing block 313 is used to prevent the positioning member 3 from retracting.

[0039] Specifically, the housing 1 has a first body portion 11 and a second body portion 12. The terminal unit 2 is installed in the first body portion 11, and the positioning member 3 is installed in the second body portion 12. The portion of the terminal unit 2 that protrudes from the housing 1 bends and extends toward the second body portion 12 and passes through the positioning member 3.

[0040] In actual use, the first body 11 is located above the second body 12. The width of the first body 11 is the same as the width of the second body 12, and the length of the first body 11 is the same as the length of the second body 12. The terminal unit 2 is L-shaped, with one end mounted on the first body 11 and the other end bent and extending toward the second body 12. The positioning member 3 is mounted on the end of the second body 12 away from the first body 11, and the two fixing arms 312 of the positioning member 3 extend toward the terminal unit 2.

[0041] In this embodiment, there are multiple terminal units 2, arranged in two rows, with three terminal units 2 in each row. There are also multiple limiting holes 311, each corresponding to one of the multiple terminal units 2.

[0042] In actual use, each limiting hole 311 has a second insertion slope, which surrounds the limiting hole 311 to facilitate the insertion of the terminal unit 2.

[0043] In actual use, the cross-section of the end of the terminal unit 2 inserted into the limiting hole 311 is V-shaped or U-shaped.

[0044] In actual use, the two fixing blocks 313 have a first insertion slope on their opposite sides. When installing the positioning component 3, the first insertion slope of the two fixing blocks 313 abuts against the two side plates 13 respectively, which facilitates the installation of the positioning component 3.

[0045] Specifically, the housing 1 has two protruding side plates 13, and the portion of the terminal unit 2 protruding from the housing 1 is located between the two side plates 13; each side plate 13 has a first groove 131 recessed from one end surface, and the two ends of the main body 31 enter the two first grooves 131 respectively; two fixing arms 312 are respectively attached to the outer walls of the two side plates 13, and each fixing block 313 abuts against the end face of the other end of the corresponding side plate 13; each side plate 13 has a protruding rib 132 protruding from its outer wall, and each fixing arm 312 has a corresponding groove 314 that cooperates with the rib 132.

[0046] In actual use, the two side plates 13 protrude from both ends of the second body portion 12. One end of the two side plates 13 is flush with the edge of the end of the second body portion 12 away from the first body portion 11, and the other end of the two side plates 13 extends toward the first body portion 11.

[0047] In actual use, each groove 314 extends toward the corresponding fixing block 313 and passes through the fixing block 313.

[0048] When installing the positioning component 3, the groove 314 slides along the rib 132 to prevent the positioning component 3 from shifting position during installation and causing false locking. After installation, the rib 132 is embedded in the groove 314 to prevent the positioning component 3 from moving back and forth.

[0049] In actual use, each first groove 131 has a third insertion slope on its side arm to facilitate the installation of the main body 31.

[0050] Specifically, the main body 31 also has a first protrusion 315 and a second protrusion 316, which are located at opposite ends of the main body 31 and are located between two fixed arms 312. The housing 1 has a second groove 133 at one end near the first groove 131, and the second protrusion 316 is used in conjunction with the second groove 133. The two first grooves 131 each have groove arms 1311, and the first protrusion 315 is located between the two groove arms 1311. The two ends of the first protrusion 315 extend toward the two groove arms 1311 and abut against the two groove arms 1311.

[0051] When the positioning member 3 is assembled into the second body 12, the two ends of the positioning member 3 are respectively embedded in the two first grooves 131, the two fixing arms 312 of the positioning member 3 are respectively attached to the outer walls of the two side plates 13, the two fixing blocks 313 are respectively snapped into the ends of the two side plates 13, the first protrusion 315 is located between the two side plates 13, and the two ends of the first protrusion 315 abut against the two side plates 13 respectively, and the second protrusion 316 protrudes into the cavity 121 through the second groove 133, and the second protrusion 316 abuts against the groove wall of the second groove 133.

[0052] In actual use, the central axes of the first protrusion 315 and the second protrusion 316 are aligned, and the first protrusion 315, the second protrusion 316 and the main body 31 form a cross-shaped structure. The gap between the second groove 133 and the two side plates 13 forms a cross-shaped cavity. The cross-shaped structure is embedded in the cross-shaped cavity, and at the same time, the displacement of the positioning member 3 is restricted from the lateral and longitudinal directions, resulting in strong stability.

[0053] In actual use, the second groove 133 has a guide slope, which facilitates the second protrusion 316 entering the second groove 133.

[0054] In actual use, the second protrusion 316 has a positioning post 32 protruding on the side facing the external circuit board assembly 5, and the external circuit board assembly 5 has a positioning hole that cooperates with the positioning post 32.

[0055] Specifically, the main body 31 has a protruding edge 317 at one end near the housing 1. The two ends of the protruding edge 317 extend toward the two first grooves 131 and pass through the first grooves 131. The protruding edge 317 is located between the second protrusion 316 and the main body 31.

[0056] In actual use, the second protrusion 316 is formed by protruding from the end of the protrusion 317 away from the main body 31.

[0057] In actual use, the central axis of the convex edge 317 is aligned with the central axis of the second convex block 316.

[0058] Specifically, the portion of the terminal unit 2 protruding from the housing 1 is bent and extended toward the positioning member 3 to form a bent portion 21, which is located between the two side plates 13. The end of the bent portion 21 has a connecting portion 22, the thickness of the end of the connecting portion 22 away from the bent portion 21 is less than the thickness of the end of the connecting portion 22 near the bent portion 21. The end of the bent portion 21 with the connecting portion 22 extends out of the positioning member 3 through the limiting hole 311, and the connecting portion 22 is used for electrical connection with the external circuit board assembly 5.

[0059] In actual use, the cross-section of the connecting part 22 is V-shaped or U-shaped.

[0060] Specifically, the housing 1 has a mounting groove 14, and the terminal unit 2 is mounted on the housing 1 via the mounting groove 14; the terminal unit 2 is provided with a limiting part 23 protruding from the part of the mounting groove 14, and the mounting groove 14 is recessed from the groove wall to provide a third groove 141 that cooperates with the limiting part 23.

[0061] In actual use, the mounting slots 14 are located in the first body 11. There are multiple mounting slots 14, which are evenly divided into two rows, each corresponding to one of the multiple terminal units 2. The row of mounting slots 14 closest to the second body 12 is located between the two side plates 13. In actual use, the mounting groove 14 has a slot 142, and the terminal unit 2 is inserted into the mounting groove 14 through the slot 142. The bent portion 21 of the terminal unit 2 protrudes out of the housing 1 through the slot 142.

[0062] In actual use, there are two limiting parts 23, which are located on both sides of the terminal unit 2 and are far apart from each other. There are also two third grooves 141.

[0063] In actual use, each limiting part 23 has a first locking block 231 and a second locking block 232. The first locking block 231 has a fourth insertion slope, and the second locking block 232 has a fifth insertion slope. The length of the fifth insertion slope is greater than the length of the fourth insertion slope. The first locking block 231 and the second locking block 232 are sequentially arranged on the same side of the limiting part 23.

[0064] Specifically, the terminal unit 2 located in the mounting groove 14 has a connecting cavity 24, an elastic contact arm 241 protruding into the connecting cavity 24, and a contact block 242, with the elastic contact arm 241 and the contact block 242 being arranged opposite to each other; the housing 1 has a socket 15 communicating with the mounting groove 14, and the external connector 6 extends into the connecting cavity 24 through the socket 15 and is sandwiched between the contact block 242 and the elastic contact arm 241; the two ends of the elastic contact arm 241 are respectively provided with lugs 2411, and the connecting cavity 24 has two fourth grooves 243 recessed from the inner wall, with the two lugs 2411 respectively movably located in the fourth grooves 243.

[0065] In actual use, the elastic contact arm 241 is inclinedly disposed in the connecting cavity 24. The end of the elastic contact arm 241 has a contact portion with a contact plane, and two lugs 2411 are located at opposite ends of the contact portion. When the external connector 6 enters the connecting cavity 24, one end contacts the contact plane, and the other end abuts against the contact block 242. When the external connector 6 enters the connecting cavity 24, it presses the elastic contact arm 241 downwards, causing the two lugs 2411 to move downwards within their respective fourth grooves 243. When the lugs 2411 abut against the upper or lower groove wall of the fourth groove 243, the elastic contact arm 241 must not continue to move upwards or downwards to prevent damage or breakage.

[0066] In actual use, the fourth groove 243 is a through groove.

[0067] In actual use, the terminal unit 2 is formed by pressing a metal sheet. One end of the metal sheet has a locking protrusion 25. The two ends of the metal sheet are connected and enclosed to form a connecting cavity 24. The top wall of the connecting cavity 24 is recessed into the cavity to form a recessed part. One side of the recessed part is concave, the locking protrusion 25 extends into the recessed part, and the other side of the recessed part is convex, forming a contact block 242.

[0068] In actual use, the socket 15 has a beveled insertion surface, which surrounds the socket 15 to facilitate the entry of the external connector 6 into the socket 15.

[0069] Specifically, it also includes a locking member 4, which has a body portion 41 and a stop arm 42 and a locking arm 43 disposed on the body portion 41; the stop arm 42 is used to prevent the retraction of the terminal unit 2; a locking block 431 protrudes from one side of the locking arm 43, the second body portion 12 has a cavity 121 and a mounting hole 122 communicating with the cavity 121, the locking arm 43 extends into the cavity 121 through the mounting hole 122, and the locking block 431 abuts against the inner wall of the cavity 121; there are two locking arms 43, each of the two locking arms 43 has a locking block 431, and the two locking blocks 431 are far apart from each other.

[0070] In actual use, there are two stop arms 42. The two stop arms 42 abut against the two rows of terminal units 2 respectively to prevent the terminal units 2 from exiting the mounting slot 14.

[0071] In actual use, the first body 11 has a mounting cavity 16 and a first slot 161 and a second slot 162 communicating with the mounting cavity 16. The first slot 161 and the second slot 162 are located on both sides of the mounting cavity 16, and the mounting cavity 16 is connected to the mounting groove 14. The stop arm 42 enters the mounting cavity 16 through the first slot 161 and extends out of the mounting cavity 16 through the second slot 162. The arm of the stop arm 42 abuts against the terminal unit 2 in the mounting groove 14 to prevent the terminal unit 2 from retracting.

[0072] In actual use, there are two mounting cavities 16, each with a corresponding first slot 161 and a second slot 162. The two mounting cavities 16 are connected to the two rows of mounting slots 14 respectively.

[0073] In actual use, the stop arm 42 abuts against the upper part of the cavity opening of the connecting cavity 24, and the bent part of the terminal unit 2 extends out of the housing 1 from below the stop arm 42.

[0074] In actual use, the end of the stop arm 42 extends into the second slot 162, but does not protrude from the second slot 162 and the housing 1.

[0075] In actual use, the stop arm 42 has a sixth insertion ramp, which is arranged around the end of the stop arm 42 to facilitate the installation of the stop arm 42.

[0076] In actual use, the locking block 431 has a seventh insertion ramp, which facilitates the entry of the locking block 431 into the cavity 121. The two locking blocks 431 are located on the sides of the two locking arms 43 that are far apart from each other. The seventh insertion ramp is located on the sides of the two locking blocks 431 that are far apart from each other.

[0077] Specifically, the two ends of the main body 41 are respectively provided with abutment ribs 44, and the two ends of each abutment rib 44 extend along the length direction of the main body 41. One end of each abutment rib 44 is connected to the corresponding locking arm 43, and the other ends of the two abutment ribs 44 are located on both sides of the stop arm 42. The two abutment ribs 44 are used to abut against the outer wall of the second body 12.

[0078] In actual use, the length of the abutment rib 44 is the same as the length of the main body 41.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A wire-to-board power connector with a terminal unit positioning structure, characterized in that: The device includes a housing (1), a terminal unit (2) mounted on the housing (1), and a positioning member (3) for limiting the position of the terminal unit (2). The positioning member (3) has a main body (31), a limiting hole (311) and a fixing part provided on the main body (31). The limiting hole (311) is a through hole. One end of the terminal unit (2) protruding from the housing (1) passes through the limiting hole (311) and is electrically connected to the external circuit board assembly (5). The positioning member (3) is mounted on the housing (1) via the fixing part. The fixing part has a fixing arm (312). The fixing arm (312) has a fixing block (313) protruding from it. The fixing arm (312) abuts against the outer wall of the housing (1). The fixing block (313) is used to lock the housing (1).

2. A wire-to-board power connector with a terminal unit positioning structure according to claim 1, characterized in that: There are two fixing arms (312), and each fixing arm (312) is provided with a fixing block (313). The fixing blocks (313) of the two fixing arms (312) are located on the side of the two fixing arms (312) that are close to each other. The housing (1) has two side plates (13), and the part of the terminal unit (2) protruding from the housing (1) is located between the two side plates (13). The two side plates (13) are respectively provided with a first groove (131), and the two ends of the main body (31) enter the first groove (131) of the two side plates (13). The two fixing arms (312) are respectively attached to the outer wall of the two side plates (13). The fixing blocks (313) of the two fixing arms (312) are used to fasten the two side plates (13). The outer wall of the two side plates (13) is respectively provided with a rib (132), and the two fixing arms (312) are respectively provided with a groove (314) that cooperates with the rib (132) of the two side plates (13).

3. A wire-to-board power connector with a terminal unit positioning structure according to claim 2, characterized in that: The main body (31) also has a first protrusion (315) and a second protrusion (316), which are located at opposite ends of the main body (31) and between two fixed arms (312); the housing (1) has a second groove (133) at one end near the first groove (131), and the second protrusion (316) and the second groove (133) work together; the first protrusion (315) is located between two side plates (13), and the two ends of the first protrusion (315) extend toward the two side plates (13) and abut against the inner walls of the two side plates (13).

4. A wire-to-board power connector with a terminal unit positioning structure according to claim 3, characterized in that: The main body (31) has a protruding edge (317) at one end near the shell (1). The two ends of the protruding edge (317) extend toward the first groove (131) of the two side plates (13) and pass through the first groove (131) of the two side plates (13). The protruding edge (317) is located between the second protrusion (316) and the main body (31).

5. A wire-to-board power connector with a terminal unit positioning structure according to claim 2, characterized in that: The portion of the terminal unit (2) protruding from the housing (1) bends and extends toward the positioning member (3) to form a bent portion (21), which is located between the two side plates (13). The end of the bent portion (21) has a connecting portion (22), the thickness of the end of the connecting portion (22) away from the bent portion (21) is less than the thickness of the end of the connecting portion (22) near the bent portion (21). The end of the bent portion (21) with the connecting portion (22) extends out of the positioning member (3) through the limiting hole (311), and the connecting portion (22) is used for electrical connection with the external circuit board assembly (5).

6. A wire-to-board power connector with a terminal unit positioning structure according to claim 1, characterized in that: The housing (1) has a mounting groove (14), and the terminal unit (2) is mounted on the housing (1) via the mounting groove (14); the terminal unit (2) is provided with a limiting part (23) at the part of the mounting groove (14), and the mounting groove (14) is recessed from the groove wall to provide a third groove (141) that cooperates with the limiting part (23).

7. A wire-to-board power connector with a terminal unit positioning structure according to claim 6, characterized in that: The terminal unit (2) located in the mounting groove (14) has a connecting cavity (24), an elastic contact arm (241) protruding into the connecting cavity (24), and a contact block (242); the housing (1) has a socket (15) communicating with the mounting groove (14), the terminal of the external connector (6) extends into the connecting cavity (24) through the socket (15), and the terminal of the external connector (6) is sandwiched between the contact block (242) and the elastic contact arm (241); the elastic contact arm (241) is provided with a lug (2411), and the connecting cavity (24) is recessed from the cavity wall into a fourth groove (243), and the lug (2411) is movably located in the fourth groove (243).

8. A wire-to-board power connector with a terminal unit positioning structure according to claim 1, characterized in that: The housing (1) has a first body (11) and a second body (12), a terminal unit (2) is installed on the first body (11), and a positioning member (3) is installed on the second body (12). The portion of the terminal unit (2) protruding from the housing (1) bends and extends toward the second body (12) and passes through the positioning member (3).

9. A wire-to-board power connector with a terminal unit positioning structure according to claim 8, characterized in that: It also includes a locking member (4), which has a body part (41) and a stop arm (42) and a locking arm (43) provided on the body part (41); the stop arm (42) is used to stop the retraction terminal unit (2); the locking arm (43) has a locking block (431) protruding from it, the second body part (12) has a cavity (121) and a mounting hole (122) communicating with the cavity (121), the locking arm (43) extends into the cavity (121) through the mounting hole (122), and the locking block (431) abuts against the inner wall of the cavity (121).

10. A wire-to-board power connector with a terminal unit positioning structure according to claim 9, characterized in that: There are two locking arms (43), each of which has a locking block (431). The locking blocks (431) of the two locking arms (43) are far apart from each other. The body part (41) is provided with abutment ribs (44). There are two abutment ribs (44). The two ends of each abutment rib (44) extend along the length direction of the body part (41). One end of the two abutment ribs (44) is connected to the two locking arms (43), and the other end of the two abutment ribs (44) is located on both sides of the stop arm (42). The two abutment ribs (44) are used to abut against the outer wall of the second body part (12).

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