A line on-off mechanism with stable conduction resistance

Abstract

The application discloses a line on-off mechanism with stable conduction resistance, and relates to the technical field of lithium battery short circuit testing. The line on-off mechanism comprises a mounting plate, a fixed electrode fixedly connected to the mounting plate, a floating electrode slidingly connected to the mounting plate, a driving member connected to the floating electrode, and the fixed electrode is provided with a first test plane, the floating electrode is provided with a second test plane, the second test plane faces the first test plane, the mounting plate is made of insulating material, the fixed electrode and the floating electrode are made of conductive material, the driving member is used for driving the floating electrode to move along the axial direction so that the second test plane is attached to or separated from the first test plane, and the floating electrode is connected to the output end of the driving member through a floating screw, so that the plane where the floating electrode is located can be inclined relative to the plane perpendicular to the axial direction. The line on-off mechanism can effectively avoid the unstable contact resistance caused by poor processing size or insufficient installation precision.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery short-circuit testing, and in particular to a circuit on-off mechanism with stable on-resistance. Background Art

[0002] The description in this section merely provides background information related to the disclosure of this specification and does not constitute prior art.

[0003] Lithium-ion batteries are widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools. Therefore, the safety requirements for lithium-ion batteries are becoming increasingly higher, and the quality requirements for manufactured products are becoming increasingly stringent.

[0004] However, in the prior art, the conduction mechanism used in the short-circuit test of lithium batteries often has unstable contact resistance due to poor processing dimensions or insufficient installation precision, thus failing to meet the requirements of the short-circuit test of lithium batteries.

[0005] The inventors have found that the conduction mechanism used in the existing lithium battery short circuit test equipment is as follows Figure 1 As shown. The first copper bar 105 and the second copper bar 106 are respectively connected to the positive and negative poles of the battery. The other end of the first copper bar 105 is connected to the first electrode 103, and the other end of the second copper bar 106 is connected to the second electrode 104. The first electrode 103 and the second electrode 104 are fixed on the electrode mounting block 102 and do not contact each other. The electrode mounting block 102 is fixed on the base plate 101. The conductive block 109 is installed at the front end of the piston rod of the cylinder 108 and can move with the piston rod of the cylinder 108. The other end of the cylinder 108 is fixed to the base plate 101 through the fixed seat 107. The material of the first electrode 103, the second electrode 104 and the conductive block 109 is copper, and the material of the electrode mounting block 102 and the base plate 101 is insulating material. When the piston rod of the cylinder 108 is extended, the conductive block 109 contacts the first electrode 103 and the second electrode 104 respectively to form a closed loop, completing the lithium battery short circuit test.

[0006] However, systematic errors such as front-to-back inconsistency and perpendicularity can occur between the first electrode 103 and the second electrode 104. Furthermore, the conductive block 109 can also introduce further systematic errors with the first and second electrodes 103, 104, resulting in inconsistencies with each bonding. Because the conductive block 109 has two contact surfaces with the first and second electrodes 103, 104 (one between the conductive block 109 and the first electrode 103, and one between the conductive block 109 and the second electrode 104), these two contact surfaces cannot completely overlap due to processing and installation issues. This can lead to unstable contact between the conductive block 109 and one of the electrodes, increasing contact resistance errors and preventing stable contact resistance.

[0007] At the same time, since the bottom plate 101 is made of insulating material, the material is often soft and has poor stability. With the increase of use time, the whole conduction mechanism will be bent, arched and other problems, which further aggravate the contact problem between the conduction block 109 and the first electrode 103 and the second electrode 104, causing unstable contact resistance between them, which greatly interferes with the final experimental test.

[0008] In addition, as shown in Figure 2 The conduction block 109 is fixed to the front end of the piston rod of the cylinder 108 by a mounting screw 110, so that the conduction block 109 can rotate with the piston rod of the cylinder 108, and when there is a machining or installation error of the fixed seat 107, the conduction block 109 will be offset, thereby causing the contact condition of the conduction block 109 and the electrode to be different each time. Although the conduction block 109 can have a certain degree of rotation space, it does not have a space to deviate from the perpendicularity, and the conduction block 109 basically remains in the vertical position. Obviously, when the whole conduction mechanism is bent or arched to a certain extent, the contact between the conduction block 109 and the first electrode 103 and the second electrode 104 will become very unstable.

[0009] Figure 3 The resistance value between the first copper bar 105 and the second copper bar 106 for 100 consecutive closing tests can be seen that the resistance value is unstable at the beginning and tends to be stable with the increase of test times. However, the lithium battery short circuit test is a continuous process, and cannot appear the condition of continuous closing of the test circuit. If the battery is replaced every time and repeated in this way until the test resistance value is stable, it will seriously affect the test accuracy and efficiency.

[0010] It should be noted that the above introduction to the technical background is only to facilitate a clear and complete description of the technical solutions of the present specification, and to facilitate the understanding of those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art only because they are described in the background section of the specification. SUMMARY

[0011] In view of the deficiencies of the prior art, one object of the present specification is to provide a line on-off mechanism with stable conduction resistance, which can effectively avoid the unstable contact resistance caused by poor machining size or insufficient installation precision, and can meet the needs of lithium battery short circuit test.

[0012] To achieve the above object, the present specification provides a line on-off mechanism with stable conduction resistance, comprising:

[0013] a mounting plate;

[0014] a fixed electrode fixedly connected to the mounting plate, the fixed electrode being provided with a first test plane;

[0015] a floating electrode slidably connected to the mounting plate, the floating electrode being provided with a second test plane, the second test plane being opposite to the first test plane; the mounting plate being made of insulating material, the fixed electrode and the floating electrode being made of conductive material;

[0016] a driving member connected to the floating electrode, the driving member being configured to drive the floating electrode to move along the axial direction so as to make the second test plane abut or separate from the first test plane; the floating electrode being connected to an output end of the driving member through a floating screw, so that the plane where the floating electrode is located can be inclined relative to a plane perpendicular to the axial direction.

[0017] As a preferred implementation, the circuit on-off mechanism further comprises a limiting member fixedly connected to the mounting plate, the floating electrode being slidably connected to the limiting member, the limiting member extending along the axial direction.

[0018] As a preferred implementation, the limiting member comprises an anti-rotation rod fixedly arranged on the first test plane and extending along the axial direction, the anti-rotation rod being eccentrically arranged relative to the output end of the driving member; the anti-rotation rod being made of insulating material; the floating electrode being provided with a second through hole for the anti-rotation rod to pass through.

[0019] As a preferred implementation, the number of the second through holes is the same as the number of the anti-rotation rods, and the diameters of the second through holes match the outer diameters of the anti-rotation rods.

[0020] As a preferred implementation, the center of the floating electrode is provided with a first through hole for the floating screw to pass through, the first through hole comprising a first circular hole and a second circular hole connected to each other; the diameter of the first circular hole is greater than the outer diameter of the head of the floating screw, the outer diameter of the head of the floating screw is greater than the diameter of the second circular hole, and the diameter of the second circular hole is greater than the outer diameter of the rod of the floating screw; the axial length of the head of the floating screw is less than the axial length of the first circular hole.

[0021] As a preferred implementation, a step is formed between the first circular hole and the second circular hole; after the floating screw is tightened, there is a gap between the head of the floating screw and the step.

[0022] As a preferred implementation, an electrode mounting block is fixedly arranged on the mounting plate, the fixed electrode being fixedly connected to the electrode mounting block; the electrode mounting block being located on the side of the fixed electrode away from the floating electrode; the electrode mounting block being made of insulating material.

[0023] As a preferred implementation form, the fixed electrode is fixedly connected with a first conductive member, one end of the first conductive member is fixedly connected to a side of the fixed electrode away from the floating electrode, and the one end of the first conductive member is located between the electrode mounting block and the fixed electrode.

[0024] As a preferred implementation form, one end of the driving member away from the second test plane is fixedly connected to the mounting plate through a fixing seat.

[0025] As a preferred implementation form, the floating electrode is fixedly connected with a second conductive member, one end of the second conductive member is fixedly connected to a top surface of the floating electrode. Advantageous effects

[0026] The line on-off mechanism provided by the embodiment has a compact structure and is easy to install. When closed, only the first test plane and the second test plane are in contact, thereby reducing the three contact surfaces in the prior art to two contact surfaces. Meanwhile, the fixed electrode is fixed and the floating electrode is driven by the driving member to move along the axial direction. In the case that each of the fixed electrode and the floating electrode has only one contact surface, the contact condition of the two electrodes will not be affected by the machining precision and the installation precision of the mounting plate, thereby effectively avoiding the situation that the contact resistance is unstable due to poor machining size or insufficient installation precision, and meeting the demand of lithium battery short circuit test. The line on-off mechanism effectively realizes the stability of the on resistance, thereby reducing the fluctuation of the overall test loop resistance precision, reducing the cost of high-precision test equipment, and improving the test efficiency.

[0027] In addition, the floating electrode is connected with the driving member through a floating screw, so that the plane where the floating electrode is located can be inclined relative to a plane perpendicular to the axial direction, i.e., the plane where the floating electrode is located can be inclined at an arbitrary angle in the circumferential direction, so that an included angle is generated between the plane where the floating electrode is located and the plane perpendicular to the axial direction. The second test plane as one plane of the floating electrode can be inclined at an arbitrary angle in the circumferential direction when the driving member drives the floating electrode to move along the axial direction to approach the fixed electrode, and finally the second test plane can better fit the first test plane.

[0028] Specific embodiments of the application are disclosed in detail in the following description and claims, and are illustrated in the accompanying drawings. It should be understood that the embodiments of the application are not limited in scope to the specific embodiments described herein, which are intended as illustrations of one or more aspects of the application. Any equivalent embodiments are intended to be within the scope of the application.

[0029] Features described and / or illustrated with respect to one implementation can be used in one or more other implementations in the same or similar manner, in combination with or in place of features in other implementations.

[0030] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings required to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0032] Figure 1 Structure diagram of the on-off mechanism in the prior art;

[0033] Figure 2 Structure diagram of another perspective of the on-off mechanism; Figure 1

[0034] Figure 3 Resistance measurement diagram of the on-off mechanism of the present embodiment when closed for one hundred times continuously; Figure 1

[0035] Figure 4 Structure diagram of the on-off mechanism of the present embodiment;

[0036] Figure 5 Structure diagram of the on-off mechanism of the present embodiment; Figure 4

[0037] Sectional view of the contact between the fixed electrode and the floating electrode when the on-off mechanism is closed; Figure 6

[0038] Top view of the on-off mechanism when opened; Figure 7

[0039] Top view of the on-off mechanism when closed; Figure 8

[0040] Resistance measurement diagram of the on-off mechanism of the present embodiment when closed for one hundred times continuously. Figure 9 BRIEF DESCRIPTION OF DRAWINGS

[0041] Prior art (101, base plate; 102, electrode mounting block; 103, first electrode; 104, second electrode; 105, first copper bar; 106, second copper bar; 107, fixed seat; 108, air cylinder; 109, on-off block; 110, mounting screw;

[0042] Figures 1 to 3 In the prior art: 101, base plate; 102, electrode mounting block; 103, first electrode; 104, second electrode; 105, first copper bar; 106, second copper bar; 107, fixed seat; 108, air cylinder; 109, on-off block; 110, mounting screw;

[0043] ​​​The application (application) in this paper: Figures 4 to 9

[0044] 1, mounting plate; 2, fixed electrode; 21, first test plane; 3, floating electrode; 31, second test plane; 32, second through hole; 33, first through hole; 331, first round hole; 332, second round hole; 333, step; 4, first conductive part; 5, second conductive part; 6, driving part; 61, output end; 7, anti-rotation rod; 8, floating screw; 81, head; 9, gasket; 10, electrode mounting block; 11, fixed seat; 12, electrode mounting block mounting screw; 13, fixed seat mounting screw; 14, fixed electrode mounting screw; 15, first conductive part mounting screw; 16, anti-rotation rod mounting screw; 17, second conductive part mounting screw; 18, driving part mounting screw; X, axial. DETAILED DESCRIPTION

[0045] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0046] It should be noted that when an element is referred to as "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] Please refer to Figures 4 to 9 The embodiment of the present application provides a line on-off mechanism with stable on-resistance, which comprises a mounting plate 1, a fixed electrode 2, a floating electrode 3 and a driving part 6.

[0049] Among them, the fixed electrode 2 is fixedly connected to the mounting plate 1, and the fixed electrode 2 is provided with a first test plane 21. ​

[0050] As shown in Figure 7 The floating electrode 3 is slidingly connected to the mounting plate 1 (the floating electrode 3 can move relative to the mounting plate 1), and the floating electrode 3 is provided with a second test plane 31. The second test plane 31 faces the first test plane 21. The mounting plate 1 is made of an insulating material, and the fixed electrode 2 and the floating electrode 3 are made of a conductive material, such as copper.

[0051] The driving member 6 is connected to the floating electrode 3 and is used to drive the floating electrode 3 to move along the axial direction X so as to make the second test plane 31 abut or separate from the first test plane 21. The floating electrode 3 is connected to the output end 61 of the driving member 6 through the floating screw 8, so that the plane where the floating electrode 3 is located can be tilted relative to the plane perpendicular to the axial direction X, that is, the plane where the floating electrode 3 is located can be tilted at any angle in the circumferential direction, so that an included angle is generated between the plane where the floating electrode 3 is located and the plane perpendicular to the axial direction X. The circumferential direction is perpendicular to the axial direction X, that is, the circumferential direction is any direction in a plane perpendicular to the axial direction X. The second test plane 31 is a plane of the floating electrode 3, and when the driving member 6 drives the floating electrode 3 to move along the axial direction X to approach the fixed electrode 2, the second test plane 31 can be tilted at any angle in the circumferential direction due to the tilting of the floating electrode 3 at any angle in the circumferential direction, and finally the second test plane 31 can better abut the first test plane 21.

[0052] The line on-off mechanism provided by the embodiment has a compact structure and is easy to install. When closed, only the first test plane 21 and the second test plane 31 are in contact, thereby reducing the three contact surfaces in the prior art to two contact surfaces. Meanwhile, the fixed electrode 2 is fixed, and the floating electrode 3 is driven by the driving member 6 to move along the axial direction X. In the case where the fixed electrode 2 and the floating electrode 3 each have only one contact surface, the contact condition of the two electrodes will not be affected by the machining precision and the installation precision of the mounting plate 1, thereby effectively avoiding the situation that the contact resistance is unstable due to poor machining size or insufficient installation precision, and meeting the needs of lithium battery short circuit testing. The line on-off mechanism effectively realizes the stability of the on-resistance, thereby reducing the fluctuation of the overall test loop resistance precision, reducing the cost of high-precision test equipment, and improving the test efficiency.

[0053] In this embodiment, the circuit-breaking mechanism also includes a stopper. The stopper is fixedly connected to the mounting plate 1 and extends along the axial direction X. The floating electrode 3 is slidably connected to the stopper. Constrained by the floating screw 8 and the stopper, and driven by the driver 6, the floating electrode 3 has only the freedom to translate along the axial direction X and to tilt relative to a plane perpendicular to the axial direction X. Unlike the prior art, where the conductive block 109 can rotate, the floating electrode 3 in this application cannot rotate. This allows the floating electrode 3 and the fixed electrode 2 to be designed in a square shape to increase the contact area and facilitate testing.

[0054] Specifically, the stopper comprises an anti-rotation rod 7 fixed to the first test plane 21 and extending along the axial direction X. The anti-rotation rod 7 is eccentrically positioned relative to the output end 61 of the driver 6. This means that their projections on a plane perpendicular to the axial direction X do not overlap (are spaced apart), thus preventing interference. The anti-rotation rod 7 is made of an insulating material. The floating electrode 3 is provided with a second through-hole 32 for passage of the anti-rotation rod 7. The second through-hole 32 is located outside the center of the floating electrode 3.

[0055] In this embodiment, the number of second through holes 32 is the same as the number of anti-rotation bars 7 , and the diameter of the second through holes 32 matches the outer diameter of the anti-rotation bars 7 , i.e., the diameter of the second through holes 32 is approximately equal to the outer diameter of the anti-rotation bars 7 . Alternatively, the diameter of the second through holes 32 can be slightly larger than the outer diameter of the anti-rotation bars 7 , and multiple anti-rotation bars 7 (e.g., two) can be provided, which still effectively restricts the degrees of freedom of the floating electrode 3 .

[0056] like Figure 5 As shown, two anti-rotation rods 7 are fixed to the fixed electrode 2 via anti-rotation rod mounting screws 16. The two anti-rotation rods 7 are spaced apart and symmetrically arranged. When the circuit breaker mechanism is installed horizontally (mounting plate 1 is installed on a horizontal surface), the line connecting the two anti-rotation rods 7 is parallel to the horizontal surface.

[0057] In other embodiments, the limiting member may include a slide rail extending on the mounting plate 1 along the axial direction X. The floating electrode 3 is slidably connected to the slide rail via a slider.

[0058] like Figure 5 As shown, a first through-hole 33 is provided at the center of the floating electrode 3 for passing a floating screw 8. The floating screw 8 passes through the first through-hole 33 and connects to the internal thread of the output terminal 61 of the driver 6. Preferably, to further protect the floating electrode 3 and the output terminal 61 and ensure a more reliable connection between them, a gasket 9 is provided between the floating electrode 3 and the output terminal 61, through which the floating screw 8 passes.

[0059] Specifically, such as Figure 6As shown, the first through hole 33 includes a first circular hole 331 and a second circular hole 332 due to the structure of the floating screw 8 having a head 81 and a stem (the stem is the part of the floating screw 8 other than the head 81). The diameter of the first circular hole 331 is greater than the outer diameter of the head 81 of the floating screw 8, and the first circular hole 331 is used to accommodate the head 81. The outer diameter of the head 81 of the floating screw 8 is greater than the diameter of the second circular hole 332, and the diameter of the second circular hole 332 is greater than the outer diameter of the stem of the floating screw 8, and the second circular hole 332 is used to accommodate part of the stem. The diameter of the first circular hole 331 and the diameter of the second circular hole 332 determine the angle of inclination of the plane in which the floating electrode 3 is located relative to the plane perpendicular to the axial direction X. The length of the head 81 of the floating screw 8 in the axial direction X is less than the length of the first circular hole 331 in the axial direction X, so that the head 81 can be completely accommodated in the first through hole 33 without protruding from the second test plane 31.

[0060] In the present embodiment, the first circular hole 331 and the second circular hole 332 form a step 333 at the connection due to the difference in size. After the floating screw 8 is tightened, there is a gap between the head 81 of the floating screw 8 and the step 333, so that the floating electrode 3 is not pressed against the front end of the output end 61 by the floating screw 8, allowing the floating screw 8 to have eccentricity and an angle of inclination with respect to the first through hole 33, thereby eliminating the additional force exerted on the floating electrode 3 by the insufficient installation precision of the driving member 6 and the fixed seat 11 described below, so that the driving member 6 only provides the necessary pressure for the contact of the two planes (the first test plane 21 and the second test plane 31).

[0061] Specifically, the electrode mounting block 10 is fixedly arranged on the mounting plate 1, and the fixed electrode 2 is fixedly connected to the electrode mounting block 10. The electrode mounting block 10 is located on the side of the fixed electrode 2 away from the floating electrode 3. The material of the electrode mounting block 10 is an insulating material. The electrode mounting block 10 is fixed to the mounting plate 1 by the electrode mounting block mounting screw 12. The fixed electrode 2 is fixed to the electrode mounting block 10 by the fixed electrode mounting screw 14.

[0062] As shown, Figure 4 The first conductive member 4 is fixedly connected to the fixed electrode 2, and the first conductive member 4 is isolated from the first test plane 21, i.e., the first conductive member 4 is mounted on the region of the fixed electrode 2 other than the first test plane 21.

[0063] Specifically, one end of the first conductive member 4 is fixedly connected to the side of the fixed electrode 2 away from the floating electrode 3, i.e., one end of the first conductive member 4 is located between the electrode mounting block 10 and the fixed electrode 2, and the other end is connected to one pole of the battery to be tested. One end of the first conductive member 4 is fixed to the fixed electrode 2 by the first conductive member mounting screw 15.

[0064] In this embodiment, the end of the driver 6 facing away from the second test plane 31 is fixedly connected to the mounting plate 1 via a fixing base 11. The mounting plate 1 is arranged horizontally, and the electrode mounting block 10 is arranged vertically. The fixing base 11 comprises a horizontal portion and a vertical portion. The horizontal portion is fixed to the mounting plate 1 via a fixing base mounting screw 13, and the end of the driver 6 facing away from the floating electrode 3 is fixed to the vertical portion via a driver mounting screw 18. The fixing base 11 is made of an insulating material. Preferably, the fixing base 11 is made of an insulating plastic material. These insulating plastic materials, when used as base materials, should have excellent rigidity and stability, meeting the physical rigidity and insulation requirements of the base.

[0065] Specifically, the floating electrode 3 is fixedly connected to a second conductive member 5, which is isolated from the second test plane 31. That is, the second conductive member 5 is mounted in an area of ​​the floating electrode 3 excluding the second test plane 31. One end of the second conductive member 5 is fixedly connected to the top surface of the floating electrode 3, effectively utilizing the structural space without affecting the movement of the floating electrode 3. One end of the second conductive member 5 is fixed to the top surface of the floating electrode 3 by a second conductive member mounting screw 17, allowing it to move along the axial direction X with the floating electrode 3. The other end of the second conductive member 5 is connected to the other electrode of the battery under test.

[0066] In this embodiment, the first conductive member 4 and the second conductive member 5 can be made of copper busbars, or conductive blocks or wires of other shapes, etc., and this application does not make any sole limitation thereto.

[0067] The driving member 6 in the embodiment of the present application is preferably a cylinder, which has a simple structure and is easy to use, and its output end 61 is a piston rod. Figure 8 As shown, when the piston rod is extended, due to the cooperation between the two anti-rotation rods 7 and the floating electrode 3 , the floating electrode 3 can only move closer to the fixed electrode 2 along the anti-rotation rods 7 .

[0068] exist Figure 9 and Figure 3 In the figure, the X-axis represents the number of tests and the Y-axis represents the closed resistance (in milliohms). Figure 3 The resistance between the first copper bus 105 and the second copper bus 106 is measured after 100 consecutive closing tests of the conduction mechanism in the prior art. It can be seen that the resistance is unstable at the beginning and tends to be stable as the number of tests increases. This is because:

[0069] 1. Systematic errors such as front-to-back inconsistency and vertical inconsistency will occur between the first electrode 103 and the second electrode 104. The conductive block 109 will also cause further systematic errors with the first electrode 103 and the second electrode 104, resulting in inconsistencies each time the electrodes are bonded.

[0070] 2. Since the bottom plate 101 may bend or bulge, these problems further aggravate the contact problem between the conductive block 109 and the first electrode 103 and the second electrode 104, resulting in unstable contact resistance between them, which greatly interferes with the final experimental test;

[0071] 3. The conducting block 109 is fixed to the front end of the piston rod of the cylinder 108 by a mounting screw 110. Although the conducting block 109 has a certain degree of rotation space, it does not have the space to deviate from the verticality. The conducting block 109 basically remains in the vertical position. Obviously, when the entire conducting mechanism is bent or arched to a certain extent, the contact between the conducting block 109 and the first electrode 103 and the second electrode 104 will become very unstable.

[0072] However, if Figure 9 As shown, a circuit-breaking mechanism with stable on-resistance, provided by an embodiment of the present application, was subjected to one hundred consecutive closed resistance measurements. The experiments demonstrated that by replacing three contact surfaces with two, limiting relative movement between the two contact surfaces, and eliminating additional forces exerted on the contact surfaces, the key point is that the movable connection between the floating electrode 3 and the output terminal 61 allows the floating electrode 3 to make surface contact with the fixed electrode 2, thereby significantly eliminating many external system errors. These errors, such as front-to-back misalignment and verticality differences between the two existing left and right separate fixed electrodes (first electrode 103 and second electrode 104), can also be eliminated. Furthermore, alignment issues between the floating electrode 3 and the fixed electrode 2 caused by bending or arching of the mounting plate 1 can be resolved. This design of the present invention ensures more stable electrical contact between the floating electrode 3 and the fixed electrode 2, significantly improving tolerance to system errors. This ensures stable on-resistance of the circuit-breaking mechanism, meeting testing requirements.

[0073] It should be noted that, in the description of this specification, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this specification, unless otherwise specified, "plurality" means two or more.

[0074] Any numerical values recited herein include all values from the lower value and up to the upper value in increments of one unit, provided that there is a separation of at least 2 units between any lower value and any higher value. As an example, if a numerical value is recited as being from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that values such as 15 to 85, 22 to 68, 43 to 51, and 30 to 32, etc. are expressly enumerated in this specification. For values which are less than one, one unit is considered to be 0.0001, 0.001, 0.01, 0.1, as appropriate. These are only examples of what is specifically enumerated herein, and are not meant to limit the application in any way. Furthermore, the inclusion of a numerical range recited herein is not intended to exclude any gyrations from the scope of the range, as appropriately interpreted.

[0075] Unless otherwise stated, all ranges include both endpoints and all numbers between the endpoints. "Approximately" or "about" when used before a range or a value means that the value falls within a range of plus or minus ten percent of the value.

[0076] All articles and references, including patents and publications, disclosed previously are incorporated herein by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps can be present in addition to those specifically recited, in order to achieve the described functionality of the combination. The term "may" when used in a permissive sense (i.e. as an

[0077] Multiple elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate multiple elements, ingredients, components or steps. To "comprise" or "comprising", or "include" or "including" or "has" or "having" or "contain" or "containing" or "consist" or "consisting" or "consisting essentially of" as used herein, can vary between "open" and "closed" transitions, and are intended to be equivalent in meaning to "comprising" or "including", or "has", "having", "contain", "containing", "consist", "consisting" or "consisting essentially of", as those terms are used in either the open-ended or the closed transitional sense.

[0078] It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent upon reading the above description. The scope of the teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for all purposes. The omission in the following claims of any aspect of subject matter that has been described above is not a disclaimer of such subject matter, nor should it be regarded that the inventors did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A circuit on-off mechanism with stable conduction resistance, characterized in that: include: Mounting plate; a fixed electrode fixedly connected to the mounting plate, the fixed electrode being provided with a first test plane; a floating electrode slidably connected to the mounting plate, the floating electrode being provided with a second test plane, the second test plane facing the first test plane; the mounting plate being made of an insulating material, and the fixed electrode and the floating electrode being made of a conductive material; A driving member connected to the floating electrode is used to drive the floating electrode to move axially so that the second test plane is aligned with or separated from the first test plane. The floating electrode is connected to the output end of the driving member via a floating screw, so that the plane where the floating electrode is located can be tilted relative to a plane perpendicular to the axial direction.

2. The circuit switching mechanism with stable conduction resistance according to claim 1, characterized in that: A first through hole is provided at the center of the floating electrode for the floating screw to pass through, and the first through hole includes a first circular hole and a second circular hole connected to each other; the diameter of the first circular hole is larger than the outer diameter of the floating screw head, the outer diameter of the floating screw head is larger than the diameter of the second circular hole, and the diameter of the second circular hole is larger than the outer diameter of the floating screw rod; the axial length of the floating screw head is smaller than the axial length of the first circular hole.

3. The circuit switching mechanism with stable conduction resistance according to claim 2, characterized in that: A step is formed between the first circular hole and the second circular hole; after the floating screw is tightened, a gap is formed between the head of the floating screw and the step.

4. The circuit switching mechanism with stable conduction resistance according to claim 1, characterized in that: The line switching mechanism further includes a limiting member fixedly connected to the mounting plate, the floating electrode is slidably connected to the limiting member, and the limiting member extends along the axial direction.

5. The circuit switching mechanism with stable conduction resistance according to claim 4, characterized in that: The limiting member includes an anti-rotation rod fixedly arranged on the first test plane and extending axially, and the anti-rotation rod is eccentrically arranged with respect to the output end of the driving member; the anti-rotation rod is made of insulating material; the floating electrode is provided with a second through hole for allowing the anti-rotation rod to pass through.

6. The circuit switching mechanism with stable conduction resistance according to claim 5, characterized in that: The number of the second through holes is the same as the number of the anti-rotation rods, and the diameter of the second through holes matches the outer diameter of the anti-rotation rods.

7. The circuit switching mechanism with stable conduction resistance according to claim 1, characterized in that: An electrode mounting block is fixedly provided on the mounting plate, and the fixed electrode is fixedly connected to the electrode mounting block; the electrode mounting block is located on a side of the fixed electrode away from the floating electrode; and the electrode mounting block is made of insulating material.

8. The circuit switching mechanism with stable conduction resistance according to claim 7, characterized in that: The fixed electrode is fixedly connected to a first conductive member, one end of the first conductive member is fixedly connected to a side of the fixed electrode facing away from the floating electrode, and one end of the first conductive member is located between the electrode mounting block and the fixed electrode.

9. The circuit switching mechanism with stable conduction resistance according to claim 1, characterized in that: One end of the driving member facing away from the second test plane is fixedly connected to the mounting plate via a fixing seat.

10. The circuit switching mechanism with stable conduction resistance according to claim 9, characterized in that: The floating electrode is fixedly connected to a second conductive member, and one end of the second conductive member is fixedly connected to the top surface of the floating electrode.

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