Board-to-board connector and board-to-board connection structure
Patent Information
- Application Number
- CN202522028149.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-19
AI Technical Summary
[0002]球栅阵列(BGA)封装工艺中，通常依赖高精度焊接(如回流焊)实现芯片与主板的电连接，这类高精度焊接需严格控制温度、时间等参数，且对焊膏涂抹、对位精度要求极高，易因工艺偏差导致虚焊、短路等问题
[0014]本申请实施例提供的板对板连接结构，采用板对板连接器对第一电路板和第二电路板进行互连，这种快插式的连接器通过机械插拔即可完成连接，无需复杂焊接工艺，手工或简单工具就能快速操作，大幅缩短装配时间；拆卸简单，出现故障时可直接拔插更换，无需专业维修设备，维护与更换更便捷；连接器的连接状态可直观观察(如是否插紧)，或通过简单导通测试验证，检测成本更低；且这种机械连接结构的环境适应性更强，对湿度、温度变化的敏感度较低，在恶劣环境下(如高温、振动场景)更易保持稳定；另外，这种机械式连接器的重复利用性更好，可多次插拔仍保持良好性能，适合需要频繁拆装的场景(如测试设备、临时连接)，生产工艺相对简单，材料和加工成本较低。
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Figure CN224745900U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit board technology, and in particular to a board-to-board connector and a board-to-board connection structure. Background Technology
[0002] In Ball Grid Array (BGA) packaging technology, high-precision soldering (such as reflow soldering) is typically used to achieve electrical connections between the chip and the motherboard. This type of high-precision soldering requires strict control of parameters such as temperature and time, and demands extremely high precision in solder paste application and alignment. Process deviations can easily lead to problems such as cold solder joints and short circuits. Furthermore, in the BGA process, solder balls and joints are susceptible to temperature changes and vibrations. Long-term use may result in solder joint fatigue and cracking due to thermal expansion and contraction, or oxidation failure due to humid environments. Utility Model Content
[0003] In view of this, in order to solve at least one of the above problems, this application needs to provide a board-to-board connector and a board-to-board connection structure using the connector.
[0004] This application provides a board-to-board connector, including: a connecting base and a connecting member connected to each other. The connecting base includes: a base body, a locking member, and a pressing assembly. The base body has a mounting cavity. The locking member is disposed on the inner wall of the mounting cavity and extends toward the central axis of the mounting cavity. The locking member axially divides the mounting cavity into a first cavity and a second cavity that are interconnected. The locking member is elastic. The pressing assembly includes a pressing member that extends into and engages with the first cavity. The pressing member has a communicating hole. The hole communicates with the mounting cavity, and the connector can extend into or retract from the communicating hole. The pressing member can move axially toward the second cavity under the action of external force and open the locking member to extend into the second cavity, thus being in a first state. The pressing member can also automatically reset after the external force is removed, thus being in a second state. In the first state, the connector can extend into or retract from the second cavity through the communicating hole. In the second state, the locking member clamps the end of the connector that extends into the second cavity to lock and electrically connect the connector.
[0005] In some possible embodiments, the pressing assembly further includes an elastic element, the two ends of which abut against the pressing member and the seat respectively, the elastic element being used to automatically reset the pressing member.
[0006] In some possible embodiments, the seat body further includes a slot disposed on the outer layer of the first cavity, the side wall of the first cavity is provided with an opening, the slot communicates with the first cavity through the opening, the side wall of the pressing member is provided with a locking part, the locking part extends into the slot through the opening, the elastic member is located in the slot, and the two ends of the elastic member respectively abut against the bottom of the slot and the locking part.
[0007] In some possible embodiments, the size of the first cavity is smaller than the size of the second cavity in a direction perpendicular to the axial direction, such that the inner wall of the first cavity forms a step toward the end of the second cavity, and the locking member is disposed on the step.
[0008] In some possible embodiments, the seat body further includes a bottom wall disposed in the second cavity away from the first cavity, the bottom wall being connected to the side wall of the second cavity, and a conductive portion being provided on the surface of the bottom wall away from the second cavity, and the locking member being electrically connected to the conductive portion.
[0009] In some possible embodiments, the seat body includes a first part and a second part, the second part being detachably disposed at one end of the first part, the first cavity being disposed in the first part, the second cavity being disposed in the second part, and the locking member being disposed on the side wall of the second part.
[0010] In some possible embodiments, the locking member includes a plurality of flexible guide portions, the plurality of guide portions being arranged circumferentially spaced along the mounting cavity, the plurality of guide portions forming a guide opening on one side facing the central axis, and the connector extending into the second cavity through the guide opening.
[0011] In some possible embodiments, the conductive part is a metal spring.
[0012] In some possible embodiments, the connector is a metal post.
[0013] This application embodiment also provides a board-to-board connection structure, including a first circuit board, a second circuit board, and a board-to-board connector as described above. The connector is disposed on the first circuit board, and the locking member is electrically connected to the circuit of the first circuit board. One end of the connector is disposed on the surface of the second circuit board facing the first circuit board and is electrically connected to the second circuit board.
[0014] The board-to-board connection structure provided in this application uses board-to-board connectors to interconnect the first and second circuit boards. This quick-connect connector can complete the connection through mechanical plugging and unplugging, without the need for complex soldering processes. It can be operated quickly by hand or with simple tools, greatly shortening the assembly time. Disassembly is simple, and in case of failure, it can be directly plugged and unplugged for replacement without the need for professional repair equipment, making maintenance and replacement more convenient. The connection status of the connector can be observed intuitively (e.g., whether it is tightly plugged in) or verified through simple continuity tests, resulting in lower testing costs. Moreover, this mechanical connection structure has stronger environmental adaptability and lower sensitivity to changes in humidity and temperature, making it easier to maintain stability in harsh environments (e.g., high temperature, vibration scenarios). In addition, this mechanical connector has better reusability, can be plugged and unplugged multiple times while maintaining good performance, and is suitable for scenarios that require frequent disassembly and assembly (e.g., testing equipment, temporary connections). The manufacturing process is relatively simple, and the material and processing costs are low. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the board-to-board connection structure provided in an embodiment of this application before interconnection.
[0016] Figure 2 for Figure 1 A schematic diagram of the plate-to-plate connection structure after interconnection.
[0017] Figure 3 for Figure 2 Partial cross-sectional view of the plate-to-plate connection structure.
[0018] Figure 4 for Figure 3 A schematic diagram of the middle connector.
[0019] Figure 5A This is a partial top view of the layout of the locking member on the seat according to an embodiment of this application.
[0020] Figure 5B for Figure 5A Side view of the layout of the locking element on the base.
[0021] Figure 5C for Figure 5A A cross-sectional view of the layout of the locking element on the base.
[0022] Figures 6A to 6C This is a schematic diagram illustrating the interconnection process between a connector and a connector base provided in an embodiment of this application.
[0023] Figures 7A to 7E This is a schematic diagram illustrating the process of setting a connector on a second circuit board according to an embodiment of this application.
[0024] Figure 8This is a schematic diagram of a first circuit board with an array of connectors provided in an embodiment of this application.
[0025] Figures 9A to 9D This is a schematic diagram illustrating the interconnection process between a first circuit board and a second circuit board via a board-to-board connector in one embodiment of this application.
[0026] Figure 10 This is a schematic diagram of the structure of a connector provided in another embodiment of this application.
[0027] Explanation of main component symbols
[0028] Plate-to-plate connection structure 100, locking components 4
[0029] Board-to-board connector 10 Conductor part 41
[0030] Connector 1, 1a, Through port 42
[0031] Connector 2 Pressing assembly 5
[0032] Seat 3, 3a Pressing element 6
[0033] Mounting cavity 31, connecting hole 61
[0034] First cavity 32, engaging part 62
[0035] Second cavity 33 Elastic element 7
[0036] First end 34, conductive part 8
[0037] Second end 35 axial Z
[0038] Step 36 First Circuit Board 20
[0039] Card slot 37 Second circuit board 30
[0040] Opening 38, Carrier plate 40
[0041] Part 1 391 Chip 50
[0042] Part 2 392 Central Axis a
[0043] Bottom wall 39, dimensions L1, L2
[0044] Primary connector 2a
[0045] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation
[0046] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0047] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component.
[0048] Please see Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a board-to-board connection structure 100, including a first circuit board 20, a second circuit board 30, and a board-to-board connector 10. The first circuit board 20 and the second circuit board 30 can be connected and electrically conductive through the board-to-board connector 10. At least one of the first circuit board 20 and the second circuit board 30 can be a chip carrier board for mounting chips. For example, the second circuit board 30 can be a chip carrier board, and the first circuit board 20 can be a main control board (or motherboard). The board-to-board connector 10 enables interconnection between the chip carrier board and the main control board.
[0049] Please see Figure 3 As shown, please refer to the following: Figure 2 The board-to-board connector 10 includes a connector 1 and a connector 2 that are connected to each other. The connector 1 is disposed on the first circuit board 20, and one end of the connector 2 is disposed on the surface of the second circuit board 30 facing the first circuit board 20. The connector 1 is electrically connected to the first circuit board 20, and the connector 2 is electrically connected to the second circuit board 30. When the connector 2 and the connector 1 are connected to each other, the first circuit board 20 and the second circuit board 30 can achieve physical connection and electrical conduction.
[0050] Please see Figure 4 As shown, please refer to the following: Figure 3The connecting seat 1 includes a seat body 3, a locking member 4, and a pressing assembly 5. The seat body 3 has a mounting cavity 31. The locking member 4 is disposed on the inner wall of the mounting cavity 31 and extends toward the central axis a of the mounting cavity 31. The locking member 4 divides the mounting cavity 31 into a first cavity 32 and a second cavity 33 that communicate with each other along the axial direction Z. The locking member 4 is elastic. Specifically, the connecting seat 1 is electrically connected to the first circuit board 20 through the locking member 4. The pressing assembly 5 includes a pressing member 6, which extends into and engages with the first cavity 32. The pressing member 6 has a communicating hole 61 that communicates with the mounting cavity 31. The connecting member 2 can extend into or retract from the communicating hole 61. Wherein, combined with... Figure 9B and Figure 9C As shown, the pressing member 6 can move axially towards the second cavity 33 under the action of external force and open the locking member 4 to extend into the second cavity 33, thus being in a first state. In the first state, the connecting member 2 can extend into or exit the second cavity 33 through the connecting hole 61. Figure 9D As shown, the pressing member 6 can also automatically reset after the external force is removed to be in the second state. In the second state, the locking member 4 clamps the end of the connector 2 that extends into the second cavity 33 to lock and electrically connect the connector 2, thereby realizing the interlocking of the connector 1 and the connector 2, and thus realizing the connection and conduction of the first circuit board 20 and the second circuit board 30.
[0051] In some embodiments, the pressing assembly 5 further includes an elastic element 7, the two ends of which respectively abut against the pressing member 6 and the seat 3, and the elastic element 7 is used to automatically reset the pressing member 6.
[0052] Please refer to it again. Figure 3 and Figure 4 As shown, the seat 3 includes a first end 34 and a second end 35 disposed opposite to each other. The opening of the mounting cavity 31 is located at the first end 34, the first cavity 32 is close to the first end 34, and the second cavity 33 is close to the second end 35. In some embodiments, along the direction perpendicular to the axial direction Z, the size L1 of the first cavity 32 is smaller than the size L2 of the second cavity 33, so that the end of the sidewall surrounding the first cavity 32 facing the second cavity 33 forms a step 36, and the locking member 4 is disposed on the step 36.
[0053] The base 3 is provided with a slot 37 near the opening end of the mounting cavity 31 (i.e., near the first end 34). The slot 37 is located outside the mounting cavity 31, that is, outside the first cavity 32. The side wall of the first cavity 32 is provided with an opening 38. The slot 37 communicates with the first cavity 32 through the opening 38. The side wall of the pressing member 6 is provided with a locking part 62. The locking part 62 extends into the slot 37 through the opening 38. The elastic member 7 is located in the slot 37, and the two ends of the elastic member 7 respectively abut against the bottom of the slot 37 and the locking part 62. In this way, when the pressing member 6 is pressed by an external force, it moves axially towards the second cavity 33 along the Z direction. The locking part 62 will press against the elastic member 7, causing the elastic member 7 to compress and deform. When the pressing member 6 needs to be withdrawn from the second cavity 33, the external force can be removed, and the pressing member 6 will automatically reset under the elastic force of the elastic member 7.
[0054] In some embodiments, along the axial direction Z, the size of the opening 38 is at least the stroke of the reciprocating movement of the pressing member 6, so as to facilitate the up-and-down movement of the pressing member 6.
[0055] In some embodiments, the base 3 is provided with a groove 37, the side wall of the mounting cavity 31 is provided with an opening 38, the side wall of the pressing member 6 is provided with a locking part 62, and an annular elastic member 7 can be provided in the groove 37. The annular elastic member 7 can make the force on the pressing member 6 more uniform during the reciprocating movement, so that the pressing member 6 can be pressed and reset smoothly.
[0056] Understandably, in other embodiments, multiple elastic elements may be provided within a circular groove 37. Multiple elastic elements can improve the uniformity of force on the pressing element 6 during reciprocating movement, so that the pressing element 6 can press and reset smoothly.
[0057] Please refer to it again. Figure 3 and Figure 4 As shown, the seat 3 also includes a bottom wall 39 disposed in the second cavity 33 away from the first cavity 32. The bottom wall 39 is connected to the side wall of the second cavity 33. A conductive part 8 is provided on the surface of the bottom wall 39 away from the second cavity 33. The locking member 4 is electrically connected to the conductive part 8. The conductive part 8 can realize the electrical connection between the connecting seat 1 and the first circuit board 20.
[0058] Please see Figures 5A to 5C As shown, please refer to the following: Figure 3The locking member 4 includes multiple conductive portions 41, each of which is elastic. These conductive portions 41 are spaced apart circumferentially along the mounting cavity 31, forming a guide opening 42 on the side facing the central axis a. The connecting member 2 can extend into the second cavity 33 through the guide opening 42. The multiple spaced conductive portions 41 are independently mounted on the sidewall of the mounting cavity 31, thus forming a blade-like structure in a ring. Figures 6A to 6C As shown, when the pressing member 6 is pressed down, the pressing member 6 moves downward and pushes the conductive part 41 to bend downward, thereby opening one circle of the conductive part 41 and enlarging the conductive opening 42. The connecting member 2 will extend into the second cavity 33 from the enlarged conductive opening 42. After that, the pressing member 6 returns to its original position and exits the second cavity 33. The opened conductive part 41 returns to its original position under its own elastic force and clamps the connecting member 2.
[0059] In some embodiments, the conductive part 41 is a metal spring.
[0060] In some embodiments, the surface of the conductive part 41 may be provided with a gold plating layer to increase conductivity and oxidation resistance.
[0061] In some embodiments, the seat 3 may be made of plastic, and the conductive part 41 may be integrally formed with the seat 3 through injection molding.
[0062] Please refer to it again. Figure 3 As shown, the connector 2 can be a metal pillar, such as a copper pillar. One end of the metal pillar is welded to the second circuit board 30, and the other end can extend into the mounting cavity 31 of the connector 1 and be locked by the locking member 4, so as to realize the connection and conduction between the connector 2 and the connector 1.
[0063] In some embodiments, the inner surface of the connector 2 may be provided with a gold plating layer to increase conductivity and oxidation resistance.
[0064] Please see Figures 7A to 7E As shown, the specific process of setting the connector 2 on the second circuit board 30 is given, which includes the following steps: Step 1, as shown Figure 7A As shown, a carrier board 40 is provided. Step 2, as... Figure 7B As shown, a primary connector 2a can be formed on one surface of the carrier plate 40 by means of lamination, exposure, development, and pattern electroplating. Step 3, as... Figure 7C As shown, connector 2 can be formed again through exposure, development, and pattern electroplating. Step 4, as... Figure 7D As shown, a nickel-palladium-gold plating layer is formed on the surface of connector 2, and then the film is removed. Step 5, as... Figure 7EAs shown, the chip 50 is mounted on the surface of the carrier board 40 opposite to the connector 2 to obtain the chip carrier board (i.e., the second circuit board 30). Understandably, the connector 2 can also be directly mounted on the second circuit board 30 using common surface mount technology.
[0065] Please refer to it again. Figure 7D and Figure 8 As shown, please refer to the following: Figure 2 The second circuit board 30 is provided with a plurality of the aforementioned connectors 2, and the first circuit board 20 is provided with a plurality of the aforementioned connectors 1. The plurality of connectors 2 and the plurality of connectors 1 are arranged in an array and correspond one-to-one. In this embodiment of the application, a quick-lock array connector system can be formed by a large number of the aforementioned board-to-board connectors 10. The quick-lock connectors 1 are surface-mounted (e.g., soldered) onto the first circuit board 20 (i.e., the motherboard) using a surface mount process. The solder balls arranged in the original array at the bottom of the second circuit board 30 (i.e., the chip carrier) are replaced with copper pillars (i.e., connectors 2). The chip carrier is inserted into the quick-lock connectors 1 soldered onto the motherboard through the copper pillars. The internal locking member 4 locks the main copper pillar for tight and rapid connection and conduction.
[0066] The following is combined with Figures 9A to 9D The specific process of locking and disassembling the connecting seat 1 and the connecting member 2 is described.
[0067] like Figure 9A As shown, the connector 1 is soldered onto the first circuit board 20, thus enabling the connector 1 to conduct electricity with the first circuit board 20.
[0068] like Figure 9B and Figure 9C As described above, the connector 2 on the second circuit board 30 is inserted into the communicating hole 61 of the pressing member 6, and the pressing member 6 is pressed down, so that the pressing member 6 moves along the axial direction Z in the first cavity 32 toward the second cavity 33 under the action of external force. At this time, as Figure 9C As shown, the pressing member 6 compresses the elastic member 7, and at the same time, the end of the pressing member 6 near the second cavity 33 will open the multiple guide portions 41 of the locking member 4 and extend into the second cavity 33. At this time, the pressing member 6 is in the first state. In the first state, the connecting member 2 can extend into the second cavity 33 through the connecting hole 61.
[0069] like Figure 9DAs shown, when the connector 2 is in place, the external force on the pressing member 6 is removed. Under the elastic force of the elastic member 7, the pressing member 6 automatically resets, that is, the pressing member 6 retracts from the second cavity 33 back into the first cavity 32. At this time, the pressing member 6 is in the second state, and at this time, the pressing member 6 will release the locking member 4. In the second state, the multiple conductive parts 41 of the locking member 4 will clamp the end of the connector 2 extending into the second cavity 33 from the surrounding area of the connector 2 to lock and electrically connect the connector 2, forming a quick mechanical lock. That is, when the connector 2 is located in the connecting hole 61 and extends into the second cavity 33, the external force is removed, and the pressing member 6 withdraws from the second cavity 33. At this time, the opened conductive parts 41 tend to return to their original shape under the action of elastic force, thereby locking the connector 2. While locking, the two contact to achieve conductivity. Through the cooperation of the connector 2 and the locking member 4, mechanical locking is achieved, which can effectively prevent accidental disengagement in the connection structure.
[0070] When it is necessary to disassemble the first circuit board 20 and the second circuit board 30, first apply external force to the pressing member 6 to make the pressing member 6 be in the aforementioned first state. At this time, the pressing member 6 will open the multiple conductive parts 41 of the locking member 4, and the connecting member 2 can be easily removed from the mounting cavity 31 to disconnect the connection. Afterwards, the external force is removed, and the pressing member 6 will automatically reset under the action of the elastic member 7, and the multiple conductive parts 41 of the locking member 4 will also automatically reset.
[0071] Please see Figure 10 As shown, another embodiment of this application also provides a connecting seat 1a, in which the seat body 3a is a detachable structure. The main difference between this seat body 3a and the aforementioned seat body 3 is that the seat body 3a includes a first part 391 and a second part 392, wherein the second part 392 is detachably disposed at one end of the first part 391, a first cavity 32 is disposed on the first part 391, a second cavity 33 is disposed on the second part 392, and a locking member 4 is disposed on the second part 392. The detachable first part 391 and the second part 392 facilitate the manufacture of the seat body 3a, make it easier to install the locking member 4 on the second part 392, and facilitate the replacement of the first part 391 without replacing the entire connecting seat 1a. In some embodiments, the first part 391 and the second part 392 can be connected by threads.
[0072] This application uses a board-to-board connector 10 to interconnect the first circuit board 20 and the second circuit board 30, which has the following advantages:
[0073] 1. Higher assembly efficiency: The board-to-board connector 10 interconnects the first circuit board 20 and the second circuit board 30. This quick-connect connector can complete the connection through mechanical plugging and unplugging, without the need for complex soldering processes. It can be operated quickly by hand or with simple tools, which greatly shortens the assembly time. In contrast, traditional BGA packaging requires high-precision soldering equipment (such as reflow soldering), has strict requirements on the operating environment and process parameters, and has a more complicated assembly process.
[0074] 2. Easier maintenance and replacement: The quick-connect board-to-board connector 10 is easy to disassemble and replace when it malfunctions, without the need for professional repair equipment. In contrast, if a traditional BGA package needs to be replaced, the solder balls must be removed (which may damage the chip or substrate), the balls must be re-placed, and then soldered again, which is technically challenging and has a long repair cycle.
[0075] 3. Lower testing costs: The connection status of the board-to-board connector 10 can be visually observed (e.g., whether it is tightly inserted) or verified through a simple continuity test. In contrast, the solder balls of traditional BGA packages are located on the bottom of the chip, requiring specialized equipment such as X-rays to inspect the soldering quality, which increases testing costs and time.
[0076] 4. Enhanced environmental adaptability: The mechanical connection structure of the board-to-board connector 10 is less sensitive to changes in humidity and temperature, and is more likely to remain stable in harsh environments (such as high temperature and vibration scenarios). In contrast, the solder balls of traditional BGA packages may suffer from solder joint fatigue and oxidation due to temperature cycling, affecting connection reliability.
[0077] 5. Improved reusability: High-quality quick-connect board-to-board connectors can be plugged in and out multiple times while maintaining good performance, making them suitable for scenarios requiring frequent disassembly and assembly (such as test equipment and temporary connections). In contrast, traditional BGA packages are prone to solder ball damage after disassembly, significantly reducing their reliability for repeated use.
[0078] 6. Lower overall cost: The manufacturing process of board-to-board connectors 10 is relatively simple, with lower material and processing costs. In contrast, traditional BGA packaging involves high-precision ball placement, soldering, and other processes, resulting in higher equipment investment and manufacturing costs, but also lower maintenance costs.
Claims
1. A board-to-board connector, characterized in that, include: A connecting base and a connector that are interconnected, wherein the connecting base includes: The base has a mounting cavity; A locking member, disposed on the inner wall of the mounting cavity and extending toward the central axis of the mounting cavity, the locking member axially divides the mounting cavity into a first cavity and a second cavity that are interconnected, the locking member being elastic; and A pressing assembly includes a pressing member that extends into and engages with the first cavity. The pressing member has a communicating hole that communicates with the mounting cavity. A connecting member can extend into or retract from the communicating hole. The pressing member can move axially toward the second cavity under the action of external force and open the locking member to extend into the second cavity, so as to be in a first state; the pressing member can also automatically reset after the external force is removed, so as to be in a second state; in the first state, the connecting member can extend into or out of the second cavity through the connecting hole; in the second state, the locking member clamps the end of the connecting member extending into the second cavity to lock and electrically connect the connecting member.
2. The board-to-board connector as described in claim 1, characterized in that, The pressing assembly also includes an elastic element, the two ends of which respectively abut against the pressing element and the seat, and the elastic element is used to automatically reset the pressing element.
3. The board-to-board connector as described in claim 2, characterized in that, The seat body also includes a slot disposed on the outer layer of the first cavity. The side wall of the first cavity is provided with an opening. The slot communicates with the first cavity through the opening. The side wall of the pressing member is provided with a locking part. The locking part extends into the slot through the opening. The elastic member is located in the slot, and the two ends of the elastic member abut against the bottom of the slot and the locking part, respectively.
4. The board-to-board connector as described in claim 1, characterized in that, Along a direction perpendicular to the axial direction, the size of the first cavity is smaller than the size of the second cavity, so that the sidewall surrounding the first cavity forms a step towards the end of the second cavity, and the locking member is disposed on the step.
5. The board-to-board connector as described in claim 1, characterized in that, The seat body also includes a bottom wall disposed in the second cavity away from the first cavity. The bottom wall is connected to the side wall of the second cavity. A conductive part is provided on the surface of the bottom wall away from the second cavity. The locking member is electrically connected to the conductive part.
6. The board-to-board connector as described in claim 1, characterized in that, The seat body includes a first part and a second part. The second part is detachably disposed at one end of the first part. The first cavity is disposed in the first part, the second cavity is disposed in the second part, and the locking member is disposed on the side wall of the second part.
7. The board-to-board connector as described in claim 1, characterized in that, The locking member includes multiple conductive parts, which are elastic. The multiple conductive parts are spaced apart circumferentially along the mounting cavity. The multiple conductive parts form a conductive opening on one side facing the central axis. The connector extends into the second cavity through the conductive opening.
8. The board-to-board connector as described in claim 7, characterized in that, The conductive part is a metal spring.
9. The board-to-board connector as described in claim 1, characterized in that, The connector is a metal column, and the inner diameter of the mounting cavity is 0.2 mm to 0.3 mm larger than the outer diameter of the connector.
10. A plate-to-plate connection structure, characterized in that, include: The first circuit board, the second circuit board, and the board-to-board connector as described in any one of claims 1 to 9, wherein the connector is disposed on the first circuit board, and the locking member is electrically connected to the circuit of the first circuit board, and one end of the connector is disposed on the surface of the second circuit board facing the first circuit board and is electrically connected to the second circuit board.