Piezoelectric element polarization tool and piezoelectric element polarization device

Abstract

The utility model discloses a piezoelectric element polarization frock and piezoelectric element polarization device relates to piezoelectric element polarization technical field, wherein, piezoelectric element polarization frock includes the mat, circuit board and positioning plate of following one another and fixedly along the first direction, the positioning plate is equipped with a plurality of positioning holes, the positioning hole is used for piezoelectric element to place with the side of the circuit board away from, a plurality of probes are installed in the circuit board, and the circuit of electric connection in the circuit board, the probe includes needle, and the needle of a plurality of the probe is inserted in a plurality of the positioning hole one to one correspondence, the side of the needle away from the circuit board is equipped with a plurality of claw heads. The utility model provides technical scheme aims at improving the polarization yield of piezoelectric element.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric element polarization technology, and in particular to a piezoelectric element polarization apparatus and a piezoelectric element polarization device. Background Technology

[0002] When polarizing a piezoelectric element, probes are used to make contact on both opposite sides of the element to apply a high-voltage electric field. Currently, the connection yield of the probes and the piezoelectric element is low, which easily leads to quality problems such as insufficient or uneven polarization, resulting in a relatively high polarization failure rate. Utility Model Content

[0003] The main purpose of this invention is to provide a piezoelectric element polarization apparatus and a piezoelectric element polarization device, which aims to improve the polarization yield of piezoelectric elements.

[0004] To achieve the above objectives, the piezoelectric element polarization apparatus proposed in this utility model includes:

[0005] A pad, a circuit board, and a positioning plate are stacked and fixed together along a first direction. The positioning plate has multiple positioning holes, the side of which faces away from the circuit board is used for placing piezoelectric elements.

[0006] Multiple probes are mounted on the circuit board and electrically connected to the circuit of the circuit board. Each probe includes a needle tip, and the needle tips of the multiple probes are inserted into the multiple positioning holes in a one-to-one correspondence. The side of the needle tip away from the circuit board is provided with multiple claws.

[0007] In one embodiment, the positioning hole includes a first hole segment and a second hole segment connected by a first stepped surface. The cross-section of the first hole segment is larger than the cross-section of the second hole segment. The first hole segment is used to place the piezoelectric element, and the needle is inserted into the second hole segment.

[0008] In one embodiment, the height of the probe is less than or equal to 4 mm.

[0009] In one embodiment, the outer periphery of the probe is circular, and the diameter of the cross-section of the needle tip is 5 mm to 8 mm.

[0010] In one embodiment, the number of claws corresponding to one of the needles is greater than or equal to 10.

[0011] In one embodiment, the probe is provided with a vent hole extending through the first direction, and the pad is provided with a plurality of clearance holes extending through the first direction, wherein a vent hole of the probe is correspondingly connected to a clearance hole.

[0012] In one embodiment, the clearance hole includes a third hole segment and a fourth hole segment connected by a second stepped surface. The cross-section of the third hole segment is larger than that of the fourth hole segment. The probe is inserted into the third hole segment and spaced apart from the second stepped surface. The vent hole is opposite to the fourth hole segment.

[0013] In one embodiment, the diameter of the vent hole is 1.5 mm to 2.5 mm.

[0014] In one embodiment, the needle is fixed to the circuit board.

[0015] In one embodiment, the probe further includes a needle body, the needle body and the claw head are respectively disposed on opposite sides of the needle head, the needle body, the needle head and the claw head are integrally formed, the circuit board is provided with a plurality of mounting holes, and one of the probes is correspondingly inserted into one of the mounting holes through its needle body and fixed to the mounting hole by welding.

[0016] In one embodiment, the needle body and the needle tip are connected by a third stepped surface, which abuts against the side of the circuit board away from the pad.

[0017] In one embodiment, the height ratio of the needle tip to the needle body is 0.3 to 0.5.

[0018] In one embodiment, the diameter ratio of the cross-section of the needle tip to the cross-section of the needle body is 1.1 to 1.5.

[0019] This utility model also proposes a piezoelectric element polarization device, including an upper polarization device and a lower polarization device, wherein the lower polarization device is configured as the aforementioned piezoelectric element polarization device, the first direction is arranged in a bottom-up direction, and the probe of at least one of the upper polarization device and the lower polarization device is configured as an elastic probe.

[0020] In this invention, a stacked structure of a pad, a circuit board, and a positioning plate is used. The pad provides support, the positioning plate provides positioning, and an external power source is supplied to the circuit board, allowing voltage to be applied to the piezoelectric element via a probe. Multiple positioning holes on the positioning plate limit the probe tip, ensuring precise alignment between each probe and its corresponding piezoelectric element. This guarantees that all claws can contact the piezoelectric element. The pad provides direct or indirect support to the probe in the first direction, ensuring all claws on the probe are at the same height, thus guaranteeing synchronous and uniform pressure application when in contact with the piezoelectric element. More importantly, the multiple claws on a single probe significantly increase the actual contact area and the number of contact points with the piezoelectric element surface. This multi-point distributed contact significantly reduces the risk of local contact failure caused by minor surface unevenness, oxidation, or contamination. Even if individual claws fail to conduct completely, the remaining claws can still maintain effective electrical connection, thereby greatly improving the overall conduction yield and effectively avoiding insufficient or uneven polarization caused by poor contact, which is beneficial to improving the polarization yield of piezoelectric components. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the assembly structure of an embodiment of the piezoelectric element polarization device provided by this utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the exploded structure of an embodiment of the piezoelectric element polarization device;

[0024] Figure 3 for Figure 1 A cross-sectional structural schematic diagram of an embodiment of a piezoelectric element polarization device;

[0025] Figure 4 for Figure 3 A magnified view of the area to the left of the dashed line;

[0026] Figure 5 for Figure 2 A schematic diagram of the structure from the perspective of the probe;

[0027] Figure 6 for Figure 2 A schematic diagram of the probe from another perspective.

[0028] Explanation of icon numbers:

[0029] 100. Pad; 110. Clearance hole; 111. Third hole section; 112. Fourth hole section; 113. Second step surface;

[0030] 200. Circuit board; 210. Mounting hole;

[0031] 300. Positioning plate; 310. Positioning hole; 311. First hole section; 312. Second hole section; 313. First step surface;

[0032] 400, Probe; 410, Needle tip; 411, Claw head; 420, Needle body; 430, Third step surface; 440, Vent hole.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This utility model proposes a piezoelectric element polarization device.

[0038] Please see Figures 1 to 4 In one embodiment of this utility model, the piezoelectric element polarization device includes:

[0039] A pad 100, a circuit board 200, and a positioning plate 300 are stacked sequentially along a first direction. The positioning plate 300 has multiple positioning holes 310, the side of which faces away from the circuit board 200 is used for placing piezoelectric elements; and

[0040] Multiple probes 400 are mounted on a circuit board 200 and electrically connected to the circuit of the circuit board 200. Each probe 400 includes a needle tip 410. The needle tips 410 of the multiple probes 400 are inserted into multiple positioning holes 310 in a one-to-one correspondence. Multiple claws 411 are provided on the side of the needle tip 410 away from the circuit board 200.

[0041] In this utility model, a stacked structure of pad 100, circuit board 200, and positioning plate 300 is used. The pad 100 provides support, and the positioning plate 300 restricts the relative position between the probe tip 410 and the piezoelectric element to be polarized. An external power supply is applied through the circuit board 200, allowing voltage to be applied to the piezoelectric element via the probe 400. Multiple positioning holes 310 on the positioning plate 300 are aligned one-to-one with the multiple piezoelectric elements and the probe tips 410, ensuring precise alignment of each probe 400 with its corresponding piezoelectric element. This guarantees that all claw tips 411 can abut against the piezoelectric element. The pad 100 provides direct or indirect support to the probe 400 in the first direction, ensuring that all claw tips 411 on the probe 400 are at the same height, thus ensuring that all claw tips 411 apply pressure synchronously and uniformly when in contact with the piezoelectric element. More importantly, each needle 410 is equipped with multiple claws 411, which greatly increases the actual contact area and the number of contact points with the piezoelectric element surface. This multi-point distributed contact significantly reduces the risk of local contact failure caused by minor unevenness, oxidation, or contamination on the piezoelectric element surface. Even if some claws 411 fail to conduct completely, the remaining claws 411 can still maintain an effective electrical connection, thereby greatly improving the overall conductivity yield and effectively avoiding insufficient or uneven polarization caused by poor contact, which is beneficial to improving the polarization yield of the piezoelectric element.

[0042] The piezoelectric element can be a piezoelectric ceramic, a ferroelectric single crystal, or a ferroelectric polymer. The stacked pad 100, circuit board 200, and positioning plate 300 can be fixed by fasteners.

[0043] The claw head 411 should be a conical structure, with its tip used to contact the surface of the piezoelectric element. The conical tip design generates higher pressure per unit area when contact pressure is applied, which helps to pierce any oxide layer or contaminants that may be present on the surface of the piezoelectric element, achieving direct conductive contact between conductors. This effectively reduces the overall contact resistance, ensures the stable application of the high-voltage electric field, and improves the reliability and uniformity of the polarization process. The claw head 411 can be a conical, triangular pyramid, or square pyramidal polygonal conical structure. Multiple claw heads 411 can be distributed in a rectangular array on the surface of the needle head 410, or arranged in multiple ring arrays.

[0044] In one implementation, please refer to Figure 4 The positioning hole 310 includes a first hole segment 311 and a second hole segment 312 connected by a first stepped surface 313. The cross-section of the first hole segment 311 is larger than the cross-section of the second hole segment 312. When both the first hole segment 311 and the second hole segment 312 are configured as circular holes, the diameter of the first hole segment 311 is larger than the diameter of the second hole segment 312. The first hole segment 311 is used to place the piezoelectric element, and the needle 410 is inserted into the second hole segment 312. That is, in the first direction, the second hole segment 312 and the first hole segment 311 will be distributed sequentially. The first hole segment 311 is located on the side away from the circuit board 200. After the piezoelectric element is placed, it can be supported by the first stepped surface 313. Especially in polarization fixtures, the piezoelectric element will also be subjected to pressure from the probe 400 of another fixture on this side. The support of the piezoelectric element by the first stepped surface 313 can well ensure the structural stability of the piezoelectric element, thereby ensuring the reliability of the polarization process and the consistency of the process. In other embodiments, the piezoelectric element itself may form a stepped structure that mates with the positioning hole 310.

[0045] In one embodiment, the height of the probe 400 is less than or equal to 4 mm. It can be understood that the height of the probe 400 is its extension length along the first direction. Within this range, the height of the probe 400 shortens the conductive path, enhances its structural rigidity and bending resistance, and allows it to withstand mechanical pressure and electric field force during polarization under a high-voltage electric field. It is less prone to bending, tilting, or vibration under pressure, thus ensuring the stability and perpendicularity of the contact between the probe 400 and the piezoelectric element. This prevents uneven contact pressure or offset caused by probe 400 deformation, ensuring the polarization yield of the piezoelectric element and extending the service life of the probe 400. Simultaneously, it also helps to reduce the thickness of the polarization fitting and the space occupied by the polarization fitting. Preferably, the height of the probe 400 is greater than or equal to 1 mm. That is, the height of the probe 400 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm, etc. In other embodiments, the height of the probe 400 may also be 0.8 mm, 4.5 mm, 5 mm, or 5.5 mm, etc.

[0046] In one embodiment, the outer periphery of the probe 400 is circular, and the diameter of the cross-section of the needle tip 410 is 5 mm to 8 mm. This ensures that the needle tip 410 has sufficient structural strength to support multiple claw tips 411, while also providing a sufficient surface area to distribute a larger number of claw tips 411, thereby guaranteeing the polarization yield of the piezoelectric element and the service life of the probe 400. The diameter of the cross-section of the needle tip 410 can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm, etc.

[0047] In other embodiments, the outer periphery of the probe 400 can also be configured as a polygon or an ellipse, and the diameter of the cross-section of the needle 410 can be 4mm, 4.5mm, 8.5mm, or 9mm, etc. The shape of the outer periphery of the probe 400, mainly the outer periphery of the needle 410, can be adapted to the outer periphery of the piezoelectric element, and the shape of the cross-sectional profile of the positioning hole 310 can also be adapted accordingly. It is not limited to a circular shape, but can also be a polygonal shape, and the size can also be adapted to ensure the polarization effect.

[0048] In one embodiment, the number of claws 411 corresponding to one needle 410 is greater than or equal to 10. This allows for the formation of a high-density array of claws 411, which, upon contact with the piezoelectric element, facilitates the formation of a dense conductive network on the surface of the piezoelectric element. Even if the surface of the piezoelectric element has small particles, localized oxidation, or slight warping, the large number of redundant contact points ensures stable current introduction, greatly improving the uniformity and integrity of the applied electric field, and thus improving the polarization yield of the piezoelectric element. The number of claws 411 on one needle 410 can be 10, 15, 20, 25, 30, etc. In other embodiments, it can also be configured as 8, 35, 40, etc.

[0049] In one implementation, please refer to Figures 4 to 6 The probe 400 is provided with a vent 440 extending along the first direction, and the pad 100 is provided with a plurality of clearance holes 110 extending along the first direction. A vent 440 of the probe 400 is correspondingly connected to a clearance hole 110. It is understood that the polarization process of piezoelectric materials is highly sensitive to temperature, especially near their Curie temperature, where ferroelectric domains are more easily oriented under the influence of an electric field. Heating the piezoelectric element to a suitable temperature can significantly reduce the coercive field of the material, improve the response speed and sufficiency of ferroelectric domain orientation, thereby improving polarization efficiency and uniformity. The side of the piezoelectric element facing away from the pad 100 is naturally exposed outside the positioning hole 310 and is easily heated by high-temperature gas. After the high-temperature gas passes sequentially through the clearance hole 110, the vent 440, and the second hole segment 312 of the positioning hole 310, it can reach the side of the piezoelectric element closest to the pad 100, thereby heating that side of the piezoelectric element. In this way, the piezoelectric element can be heated uniformly and efficiently. Furthermore, as the high-temperature gas flows through the vent 440, it simultaneously heats the probe 400, making the probe 400 itself a heat conduction medium. This not only helps maintain the temperature stability of the interface between the probe 400 and the piezoelectric element, reducing temperature gradients caused by heat loss, but also improves the thermal uniformity of the entire contact area, preventing localized overcooling or overheating, and further ensuring the consistency of polarization quality. In other embodiments, the pad 100, positioning plate 300, etc., can also be configured as high thermal conductivity materials, which can efficiently conduct the heat of the high-temperature gas to the piezoelectric element.

[0050] In one implementation, please refer to Figure 4 The clearance hole 110 includes a third hole segment 111 and a fourth hole segment 112 connected by a second step surface 113. The cross-section of the third hole segment 111 is larger than the cross-section of the fourth hole segment 112. The probe 400 is inserted into the third hole segment 111 and spaced apart from the second step surface 113. The vent hole 440 is opposite to the fourth hole segment 112.

[0051] It is understood that the third hole segment 111 and the fourth hole segment 112 are configured to correspond to the shape of the probe 400. Both are circular holes, with the diameter of the third hole segment 111 being larger than the diameter of the fourth hole segment 112. This creates an annular second stepped surface 113 at their connection. A claw head 411 is positioned at one end of the probe 400, and the other end of the probe 400 is inserted into the third hole segment 111, spaced apart from the second stepped surface 113. The vent hole 440 and the fourth hole segment 112 are positioned opposite each other, allowing them to communicate. High-temperature gas flows into the vent hole 440 through the fourth hole segment 112, thus entering the interior of the probe 400. The high-temperature gas can also enter the third hole segment 111, surrounding the periphery of the probe 400's end, thus effectively heating the probe 400. In other embodiments, the end face of the probe 400 can directly abut against the second stepped surface 113.

[0052] In one embodiment, the diameter of the vent 440 is 1.5 mm to 2.5 mm. That is, the vent 440 is configured as a circular hole with a relatively smooth inner wall, which can avoid excessive resistance to the flow of high-temperature gas. The diameter of the vent 440 is within the range of this embodiment, which can ensure sufficient high-temperature gas supply flow and supply efficiency, thereby ensuring the polarization efficiency and polarization effect of the voltage element. The diameter of the vent 440 can be 1.5 mm, 2 mm, or 2.5 mm; in other embodiments, it can also be 1.2 mm, 2.8 mm, or 3 mm, etc.

[0053] In one embodiment, the needle 410 is fixed to the circuit board 200. That is, the probe 400 is configured as a fixed probe 400. In this way, the piezoelectric element polarization device can be positioned below the piezoelectric element. After the claw 411 contacts the piezoelectric element, the supporting force of the pad 100 can be transmitted to the piezoelectric element through the needle 410, thereby supporting the piezoelectric element. This not only ensures the positional stability of the probe 400 during energization and heating, but also avoids warping or deformation of the piezoelectric element due to uneven local force or insufficient support, helping to maintain good electrical contact and improving the reliability and consistency of the polarization process. In other embodiments, the probe 400 can also be configured as an elastic probe 400, that is, the needle 410 is connected to the needle body 420 or the circuit board 200 through an elastic structure such as a spring.

[0054] In one implementation, please refer to Figures 4 to 6The probe 400 further includes a needle body 420, with the needle body 420 and the claw head 411 respectively located on opposite sides of the needle head 410. The needle body 420, needle head 410, and claw head 411 are integrally formed. The circuit board 200 has multiple mounting holes 210. Each probe 400 is inserted into a mounting hole 210 through its needle body 420 and fixed to the mounting hole 210 by welding. In this embodiment, the probe 400 adopts an integral forming process, ensuring that the structure of the needle body 420, needle head 410, and claw head 411 is continuous and the materials are uniform, eliminating the thermal resistance, poor electrical contact, and mechanical weak points that may occur with separate connections. This integral structure has excellent electrical conductivity, thermal conductivity, and mechanical strength, making it particularly suitable for high-temperature and high-pressure polarized environments. The needle body 420 is inserted into the mounting hole 210 of the circuit board 200 and fixed by soldering. The probe 400, through the solder and the typical circuit diagram on the circuit board 200, not only achieves a low-resistance electrical connection but also forms a robust mechanical anchor, preventing the probe 400 from loosening or shifting under thermal expansion and contraction or gas flow impact. In other embodiments, the probe 400 may not have a needle body 420; the needle tip 410 may be directly mounted on the circuit board 200.

[0055] In one embodiment, please refer to the following: Figures 4 to 6 The needle body 420 and the needle tip 410 are connected by a third stepped surface 430, which abuts against the side of the circuit board 200 opposite to the pad 100. When the outer periphery of the probe 400 is circular, both the needle body 420 and the needle tip 410 are cylindrical, and the third stepped surface 430 at their connection is also annular. The third stepped surface 430 can abut against the surface of the circuit board 200, or a stepped surface can be provided in the mounting hole 210 to abut against the third stepped surface 430, thereby providing a precise axial positioning reference for the probe 400. After welding and fixing, the contact surface between the third stepped surface 430 and the circuit board 200 becomes an additional support surface, which helps to disperse the thermal stress and mechanical load borne by the probe 400 during operation, improving the installation stability of the probe 400 and the reliability of the overall tooling structure.

[0056] In one embodiment, the height ratio of the needle tip 410 to the needle body 420 is 0.3 to 0.5. Maintaining this height ratio, i.e., with a lower needle tip 410, significantly reduces the risk of bending deformation and stress concentration, improves the overall rigidity and fatigue resistance of the probe 400, and ensures long-term reliability. Simultaneously, the higher needle body 420 provides sufficient insertion depth, allowing the probe 400 to reliably engage with the mounting holes 210 of the circuit board 200 and the clearance holes 110 of the pad 100. A sufficiently strong solder joint can be formed between the needle body 420 and the circuit board 200, and the pad 100 can reliably provide support for the probe 400 through the contact between the second step surface 113 and the end face of the needle body 420. The height ratio of the needle tip 410 to the needle body 420 can be 0.3, 0.35, 0.4, 0.45, or 0.5. In other embodiments, the height ratio may also be 0.2, 0.25, 0.55, or 0.6.

[0057] In one embodiment, the diameter ratio of the cross-section of the needle tip 410 to the cross-section of the needle body 420 is 1.1 to 1.5. That is, the thickness of the needle tip 410 and the needle body 420 is relatively uniform, which helps maintain the structural stability of the probe 400. At the same time, the third step surface 430 formed at the connection between the two can also have an appropriate size, thereby ensuring the reliable contact between the third step surface 430 and the circuit board 200. Specifically, this diameter ratio can be 1.1, 1.2, 1.3, 1.4, or 1.5. In other embodiments, the diameter ratio can also be 1.05, 1.6, or 1.7.

[0058] This utility model also proposes a piezoelectric element polarization device, which includes an upper polarization device and a lower polarization device. The lower polarization device is configured as the aforementioned piezoelectric element polarization device, and the first direction is arranged in an upward direction. The probe of at least one of the upper and lower polarization devices is configured as an elastic probe. This piezoelectric element polarization device adopts all the technical solutions of all the above embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0059] It should be noted that the up and down directions mentioned in this utility model are all based on the ground. The direction facing the ground is downward, that is, the side of the relevant structure facing the ground corresponds to its lower side, and the direction away from the ground is upward, that is, the side of the relevant structure away from the ground corresponds to its upper side.

[0060] Specifically, the piezoelectric element can be supported by a positioning hole formed by the lower polarization fixture. The lower surface of the piezoelectric element faces the lower polarization fixture, while the upper polarization fixture is distributed on the upper side of the piezoelectric element, with its probes facing the upper surface of the piezoelectric element. Thus, the probes of the two polarization fixtures respectively contact and conduct electricity to the upper and lower surfaces of the piezoelectric element, thereby applying a high-voltage electric field. The probes of both polarization fixtures can be elastic probes to accommodate variations in the thickness tolerance and surface flatness of the piezoelectric element; alternatively, a differentiated configuration can be used, with the upper polarization fixture using elastic probes and the lower polarization fixture using rigid, fixed probes. In this case, the lower polarization fixture provides good support, and combined with the elastic compensation capability of the upper fixture, it ensures uniform contact pressure and high electrical conductivity between the probes and the piezoelectric element, which is beneficial for ensuring the polarization yield of the piezoelectric element.

[0061] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A piezoelectric element polarization apparatus, characterized in that, include: A pad, a circuit board, and a positioning plate are stacked and fixed together in sequence along a first direction. The positioning plate is provided with multiple positioning holes, and the side of the positioning holes facing away from the circuit board is used for placing piezoelectric elements. as well as Multiple probes are mounted on the circuit board and electrically connected to the circuit of the circuit board. Each probe includes a needle tip, and the needle tips of the multiple probes are inserted into the multiple positioning holes in a one-to-one correspondence. The side of the needle tip away from the circuit board is provided with multiple claws.

2. The piezoelectric element polarization apparatus as described in claim 1, characterized in that, The positioning hole includes a first hole segment and a second hole segment connected by a first stepped surface. The cross-section of the first hole segment is larger than the cross-section of the second hole segment. The first hole segment is used to place the piezoelectric element, and the needle is inserted into the second hole segment.

3. The piezoelectric element polarization apparatus as described in claim 1, characterized in that, The height of the probe is less than or equal to 4 mm; And / or, the outer periphery of the probe is circular, and the diameter of the cross-section of the needle tip is 5 mm to 8 mm; And / or, the number of claws corresponding to one of the needles is greater than or equal to 10.

4. The piezoelectric element polarization apparatus as described in claim 1, characterized in that, The probe is provided with a vent hole extending through the first direction, and the pad is provided with a plurality of clearance holes extending through the first direction, with a vent hole of the probe correspondingly connected to a clearance hole.

5. The piezoelectric element polarization apparatus as described in claim 4, characterized in that, The clearance hole includes a third hole segment and a fourth hole segment connected by a second stepped surface. The cross-section of the third hole segment is larger than that of the fourth hole segment. The probe is inserted into the third hole segment and spaced apart from the second stepped surface. The vent hole is opposite to the fourth hole segment. And / or, the diameter of the vent hole is 1.5 mm to 2.5 mm.

6. The piezoelectric element polarization apparatus according to any one of claims 1 to 5, characterized in that, The needle is fixed to the circuit board.

7. The piezoelectric element polarization apparatus as described in claim 6, characterized in that, The probe also includes a needle body, and the needle body and the claw head are respectively located on opposite sides of the needle head. The needle body, the needle head and the claw head are integrally formed. The circuit board has multiple mounting holes. One of the probes is inserted into one of the mounting holes through its needle body and fixed to the mounting hole by welding.

8. The piezoelectric element polarization apparatus as described in claim 7, characterized in that, The needle body and the needle tip are connected by a third stepped surface, which abuts against the side of the circuit board away from the pad.

9. The piezoelectric element polarization apparatus as described in claim 8, characterized in that, The height ratio of the needle tip to the needle body is 0.3 to 0.5; And / or, the diameter ratio of the cross-section of the needle tip to the cross-section of the needle body is 1.1 to 1.

5.

10. A piezoelectric element polarization device, characterized in that, It includes an upper electrode assembly and a lower electrode assembly, wherein the lower electrode assembly is configured as a piezoelectric element electrode assembly according to any one of claims 1 to 9, the first direction is arranged in a bottom-up direction, and the probe of at least one of the upper electrode assembly and the lower electrode assembly is configured as an elastic probe.

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