Line on-off mechanism with stable on-resistance value

Abstract

The invention discloses a line on-off mechanism with a stable on-resistance value, and relates to the technical field of lithium battery short circuit testing. The fixed electrode is fixedly connected to the mounting plate and is provided with a first test plane; the floating electrode is connected to the mounting plate in a sliding manner and is provided with a second test plane, and the second test plane is opposite to the first test plane; the mounting plate is made of an insulating material, and the fixed electrode and the floating electrode are made of a conductive material; the driving part is connected with the floating electrode and 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; the floating electrode is connected with the output end of the driving piece through the floating screw, so that the plane where the floating electrode is located can incline relative to the plane perpendicular to the axial direction. The circuit on-off mechanism can effectively avoid the situation that the contact resistance value is unstable due to poor machining 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 base plate 101 is made of insulating materials, these materials are often soft and have poor stability. As the use time increases, the entire conductive mechanism will have problems such as bending and arching. 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 causes great interference to the final experimental test.

[0008] In addition, if Figure 2 As shown, the conductive block 109 is fixed to the front end of the piston rod of the cylinder 108 by a mounting screw 110. The conductive block 109 can rotate with the piston rod of the cylinder 108. When there are machining or installation errors in the fixing base 107, the conductive block 109 will be offset, resulting in different contact conditions between the conductive block 109 and the electrodes each time. Although the conductive block 109 has a certain degree of rotation space, it does not have the space to deviate from the vertical position. The conductive block 109 basically remains in a vertical position. Obviously, if the entire conductive mechanism undergoes a certain degree of bending or arching, the contact between the conductive block 109 and the first electrode 103 and the second electrode 104 will become very unstable.

[0009] Figure 3 The resistance between the first copper busbar 105 and the second copper busbar 106, measured after 100 consecutive closed circuit tests, shows that the resistance is initially unstable but stabilizes as the number of tests increases. However, lithium battery short-circuit testing is a continuous process, and continuous closing of the test circuit is unacceptable. Repeating this process every time a battery is replaced until the resistance stabilizes would severely impact test accuracy and efficiency.

[0010] It should be noted that the above technical background is merely provided to provide a clear and complete description of the technical solutions of this specification and to facilitate understanding by those skilled in the art. Simply because these solutions are described in the background technology section of this specification, it should not be assumed that the above technical solutions are well known to those skilled in the art. Summary of the Invention

[0011] In view of the shortcomings of the existing technology, one purpose of this specification is to provide a circuit on-off mechanism with stable conduction resistance, which can effectively avoid the unstable contact resistance caused by poor processing dimensions or insufficient installation accuracy, and can meet the needs of lithium battery short-circuit testing.

[0012] To achieve the above objectives, the embodiments of this specification provide a circuit switching mechanism with stable on-resistance, comprising: 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.

[0013] As a preferred embodiment, 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.

[0014] As a preferred embodiment, 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; and the floating electrode is provided with a second through hole for the anti-rotation rod to pass through.

[0015] As a preferred embodiment, 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.

[0016] As a preferred embodiment, 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.

[0017] As a preferred embodiment, 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.

[0018] As a preferred embodiment, 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.

[0019] As a preferred embodiment, 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.

[0020] As a preferred embodiment, the end of the driving member facing away from the second test plane is fixedly connected to the mounting plate via a fixing seat.

[0021] As a preferred embodiment, 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. Beneficial effects

[0022] The circuit on-off mechanism provided in this embodiment features a stable on-resistance value, a compact structure, and easy installation. When closed, only the first and second test planes come into contact, reducing the three contact surfaces in the prior art to two. Simultaneously, the fixed electrode remains stationary, while the floating electrode is driven axially by a driver. With only one contact surface each, the fixed and floating electrodes maintain contact regardless of the machining and installation accuracy of the mounting plate. This effectively avoids unstable contact resistance due to poor machining dimensions or insufficient installation accuracy, meeting the requirements of lithium battery short-circuit testing. This circuit on-off mechanism effectively stabilizes the on-resistance value, thereby reducing fluctuations in the resistance accuracy of the overall test circuit, lowering the cost of high-precision testing equipment, and improving testing efficiency.

[0023] Furthermore, the floating electrode is connected to the driving member via a floating screw, such that the plane of the floating electrode can be tilted relative to a plane perpendicular to the axial direction. That is, the plane of the floating electrode can be tilted at any circumferential angle, thereby creating an angle between the plane of the floating electrode and the plane perpendicular to the axial direction. Furthermore, the second test plane, being a plane of the floating electrode, can be tilted at any circumferential angle when the driving member drives the floating electrode to move axially toward the fixed electrode, thereby enabling the second test plane to better align with the first test plane.

[0024] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0025] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0026] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 It is a structural diagram of a conducting mechanism in the prior art; Figure 2 for Figure 1 A structural diagram from another perspective; Figure 3 for Figure 1 The resistance measurement diagram of the conduction mechanism closed one hundred times continuously; Figure 4 A schematic diagram of the three-dimensional structure of a circuit switching mechanism with stable on-resistance provided in this embodiment; Figure 5 for Figure 4 Schematic diagram of the explosion structure; Figure 6 It is a cross-sectional view of the contact point between the fixed electrode and the floating electrode when the circuit breaker mechanism is closed; Figure 7 This is a top view of the line on-off mechanism when it is disconnected; Figure 8 This is a top view of the circuit on-off mechanism when it is closed; Figure 9 This is a measurement diagram of the resistance of the circuit on-off mechanism provided in this embodiment after one hundred consecutive closing times.

[0029] Description of reference numerals: Existing technology ( Figures 1 to 3 ) In: 101, bottom plate; 102, electrode mounting block; 103, first electrode; 104, second electrode; 105, first copper busbar; 106, second copper busbar; 107, fixing base; 108, cylinder; 109, conduction block; 110, mounting screws; This application ( Figures 4 to 9 )middle: 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 circular hole; 332. Second circular 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. Fixing seat; 12. Electrode mounting block mounting screw; 13. Fixing 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 direction. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] See also Figures 4 to 9 The embodiment of the present application provides a circuit on-off mechanism with stable conduction resistance, comprising: a mounting plate 1 , a fixed electrode 2 , a floating electrode 3 , and a driving member 6 .

[0034] 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 .

[0035] like Figure 7As shown, the floating electrode 3 is slidably connected to the mounting plate 1 (the floating electrode 3 is movable relative to the mounting plate 1). 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, while the fixed electrode 2 and the floating electrode 3 are made of a conductive material, such as copper.

[0036] The driver 6 is connected to the floating electrode 3 and is used to drive the floating electrode 3 to move along the axial direction X, thereby aligning or separating the second test plane 31 with the first test plane 21. The floating electrode 3 is connected to the output end 61 of the driver 6 via a floating screw 8, allowing the plane of the floating electrode 3 to tilt relative to a plane perpendicular to the axial direction X. Specifically, the plane of the floating electrode 3 can tilt at any circumferential angle, creating an angle between the plane of the floating electrode 3 and the plane perpendicular to the axial direction X. The circumferential direction is perpendicular to the axial direction X, meaning that the circumferential direction is any direction within a plane perpendicular to the axial direction X. As the second test plane 31 is a plane of the floating electrode 3, when the driver 6 drives the floating electrode 3 to move along the axial direction X toward the fixed electrode 2, the floating electrode 3 can tilt at any circumferential angle, thereby enabling the second test plane 31 to better align with the first test plane 21.

[0037] The circuit on-off mechanism with stable on-resistance provided in this 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. At the same time, the fixed electrode 2 is stationary, while the floating electrode 3 is driven by the driver 6 to move along the axial direction X. Since the fixed electrode 2 and the floating electrode 3 each have only one contact surface, the contact between the two electrodes is not affected regardless of the machining and installation accuracy of the mounting plate 1. This effectively avoids unstable contact resistance caused by poor machining dimensions or insufficient installation accuracy, meeting the requirements of lithium battery short-circuit testing. This circuit on-off mechanism effectively stabilizes the on-resistance, thereby reducing fluctuations in the resistance accuracy of the overall test circuit, reducing the cost of high-precision testing equipment, and improving testing efficiency.

[0038] 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.

[0039] 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.

[0040] 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 .

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Specifically, such as Figure 6As shown, since the floating screw 8 has a head 81 and a shaft (the shaft is the portion of the floating screw 8 other than the head 81), the first through-hole 33 includes a first circular hole 331 and a second circular hole 332 connected to each other. The diameter of the first circular hole 331 is larger than the outer diameter of the head 81 of the floating screw 8 and is used to accommodate the head 81. The outer diameter of the head 81 of the floating screw 8 is larger than the diameter of the second circular hole 332, which in turn has a diameter larger than the outer diameter of the shaft of the floating screw 8 and is used to accommodate a portion of the shaft. The diameters of the first and second circular holes 331 and 332 determine the angle at which the plane of the floating electrode 3 can tilt relative to a plane perpendicular to the axial direction X. The axial length of the head 81 of the floating screw 8 is smaller than the axial length of the first circular hole 331, allowing the head 81 to be fully accommodated within the first through-hole 33 without protruding beyond the second test plane 31.

[0045] In this embodiment, the different sizes of the first and second circular holes 331 and 332 form a step 333 at their junction. When the floating screw 8 is tightened, a gap exists between the head 81 of the floating screw 8 and the step 333. This prevents the floating screw 8 from pressing the floating electrode 3 against the front end of the output terminal 61. This allows for eccentricity and angle deviation between the floating screw 8 and the first through-hole 33. This eliminates any additional force exerted on the floating electrode 3 by inaccurate installation of the driver 6 and, later described, the fixing base 11. The driver 6 only needs to provide the necessary pressure to ensure contact between the two surfaces (the first test plane 21 and the second test plane 31).

[0046] Specifically, an electrode mounting block 10 is fixedly mounted 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 facing away from the floating electrode 3. The electrode mounting block 10 is made of an insulating material. The electrode mounting block 10 is secured to the mounting plate 1 via electrode mounting block mounting screws 12. The fixed electrode 2 is secured to the electrode mounting block 10 via fixed electrode mounting screws 14.

[0047] like Figure 4 As shown, the fixed electrode 2 is fixedly connected to the first conductive member 4 , and the first conductive member 4 is isolated from the first test plane 21 , that is, the first conductive member 4 is installed in the area of the fixed electrode 2 except the first test plane 21 .

[0048] Specifically, one end of the first conductive member 4 is fixedly connected to the side of the fixed electrode 2 facing away from the floating electrode 3. That is, 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 electrode of the battery under test. One end of the first conductive member 4 is fixed to the fixed electrode 2 via a first conductive member mounting screw 15.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 .

[0053] 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: 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. 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; 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.

[0054] 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.

[0055] 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.

[0056] Any numerical value cited herein includes all values of the lower and upper values in increments of one unit from the lower value to the upper value, provided that there is at least a two-unit interval between any lower value and any higher value. For example, if the value of a component quantity or process variable (e.g., temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended to illustrate that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also explicitly listed in this specification. For values less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples intended to be clearly stated, and it is to be understood that all possible combinations of the values listed between the minimum and maximum values are explicitly stated in this specification in a similar manner.

[0057] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. When used with a range, "about" or "approximately" applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the specified endpoints.

[0058] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." when describing a combination should include the identified elements, ingredients, components, or steps and other elements, ingredients, components, or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may," it is intended to indicate that any attribute described as "may" be optional.

[0059] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0060] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to be a disclaimer of such subject matter, nor should it be assumed 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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