Single Electrode Detection Fixture

Abstract

The present invention discloses a single-pole piece detection jig, comprising an upper jig group, a middle shell, and a lower jig group, which are matched in sequence from top to bottom, as well as a hard diaphragm, a reaction pole piece, a top piece, a piston rod, a first spring, and a second spring; the middle shell is provided with a central axis hole for placing the pole piece to be tested, and a step portion is provided on the side wall of one end of the central axis hole facing the lower jig group; the upper jig group and the lower jig group are respectively movably and sealingly matched at the upper and lower ends of the middle shell; the hard diaphragm is matched on the step portion; the reaction pole piece is matched on the side of the hard diaphragm facing the lower jig group and is fixed by the top piece; the piston rod is movably and sealingly passed through the upper jig group, and its inner end abuts the pole piece to be tested in the central axis hole; the first spring is provided between the upper jig group and the piston rod; the second spring is provided between the lower jig group and the top piece. The present invention can be used to detect the thickness change of a single pole piece to meet more precise and targeted detection needs.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a single-pole piece detection jig. Background Art

[0002] Button batteries, also known as button batteries, are batteries with an appearance like a small button. Generally speaking, they have a larger diameter and a thinner thickness (compared to cylindrical batteries, such as the No. 5 AA batteries on the market).

[0003] The electrode sheets of button batteries undergo volume changes during the charge and discharge process (possibly becoming thinner or thicker). This change significantly impacts the overall battery's electrical and installation performance. Therefore, during product design or production, the thickness change of the electrode sheets during charge and discharge is measured to fully understand the expansion and contraction effects of the corresponding electrode sheets during charge and discharge. This provides guidance for the research and development of electrode materials, and can also be used for quality control of battery electrode sheets within a batch through random inspections.

[0004] Testing button cell batteries typically requires a button fixture. The positive, separator, and negative electrodes are stacked and placed inside the fixture. Electrolyte is then added to simulate a battery, and the battery is then powered on for testing. Existing button fixtures can only measure the thickness change of the entire structure consisting of the positive, separator, and negative electrodes, and are unable to measure the thickness change of individual electrodes, resulting in limitations. Summary of the Invention

[0005] The purpose of the present invention is to provide a single pole piece detection fixture that can be used to detect the thickness change of a single pole piece to meet more precise and targeted detection needs.

[0006] In order to achieve the above object, the solution of the present invention is:

[0007] A single-pole piece detection jig comprises an upper jig group, a middle shell and a lower jig group, which are matched in sequence from top to bottom, as well as a hard diaphragm, a reaction pole piece, a top piece, a piston rod, a first spring and a second spring; the middle shell is provided with a central axis hole for placing the pole piece to be tested, and the side wall of the central axis hole facing the lower jig group is provided with a step portion; the upper jig group and the lower jig group are respectively movably and sealingly matched at the upper and lower ends of the middle shell; the hard diaphragm is matched on the step portion; the reaction pole piece is matched on the side of the hard diaphragm facing the lower jig group and is fixed by the top piece; the piston rod is movably and sealingly passed through the upper jig group, and its inner end abuts the pole piece to be tested in the central axis hole; the first spring is arranged between the upper jig group and the piston rod; the second spring is arranged between the lower jig group and the top piece.

[0008] A diaphragm clamping ring for axially limiting the hard diaphragm is provided at one end of the central axis hole facing the lower fixture assembly; the diaphragm clamping ring is provided with a movable hole for the top piece to movably penetrate.

[0009] Preferably, the diaphragm retaining ring is threadedly connected to the central shaft hole.

[0010] The upper fixture group includes an upper shell, an upper screw cover and an upper cover plate; the upper shell covers the upper end surface of the middle shell; the upper screw cover is threadedly connected to the upper end circumference of the middle shell and axially limits the upper shell; the upper cover plate is passed through the upper screw cover and fixedly connected to the upper shell, and an upper conductive rod is provided on it; the piston rod is movably and sealedly passed through the upper shell.

[0011] Preferably, at least two first positioning pins are provided on a surface of the upper shell facing the middle shell; and the middle shell is provided with positioning holes for the first positioning pins to pass through.

[0012] The lower fixture group includes a lower shell, a lower screw cover and a lower cover plate; the lower shell covers the lower end surface of the middle shell; the lower screw cover is threadedly connected to the lower end circumference of the middle shell and axially limits the lower shell; the lower cover plate is passed through the lower screw cover and fixedly connected to the lower shell, and a lower conductive rod is provided on it.

[0013] Preferably, at least two second positioning pins are provided on a side of the lower shell facing the middle shell; and the middle shell is provided with positioning holes for the second positioning pins to pass through.

[0014] The hard diaphragm is a ceramic diaphragm for electrolysis.

[0015] The upper fixture assembly is provided with a through hole for the piston rod to movably pass through.

[0016] The inner end of the piston rod is provided with a pressure block; the two ends of the first spring abut against the inner side surface of the upper shell and the end surface of the pressure block.

[0017] After adopting the above technical solution, the present invention has the following technical effects:

[0018] ① The electrode to be tested and the reaction electrode are separated by a hard diaphragm. The thickness variation of the reaction electrode will not affect the measurement of the thickness variation of the electrode to be tested, so that the detection fixture can specifically detect the thickness variation of the electrode to be tested, and the detection of a single electrode is more accurate and targeted.

[0019] ② The electrode to be tested and the reaction electrode are given a certain amount of pressure by the piston rod and the top piece respectively, so that the two are respectively attached to the upper and lower surfaces of the hard diaphragm to ensure complete reaction and the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of a specific embodiment of the present invention;

[0021] Figure 2 An exploded view of a specific embodiment of the present invention;

[0022] Figure 3 is a cross-sectional view of a housing in a specific embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of a specific embodiment of the present invention;

[0024] Description of Figure Numbers:

[0025] 1---upper fixture assembly; 11---upper housing; 111---first positioning pin;

[0026] 112--Perforation; 12---Screw-on cap; 121--First anti-slip pattern;

[0027] 13---upper cover; 131--upper conductive rod; 2----middle shell;

[0028] 21---center axis hole; 22---step portion; 23---positioning hole;

[0029] 3----Lower fixture assembly; 31---Lower housing; 311--Second positioning pin;

[0030] 32---Lower screw cap; 321--Second anti-slip groove; 33---Lower cover;

[0031] 331--lower conductive rod; 4----hard diaphragm; 5----reaction electrode;

[0032] 6----Top piece; 61---Guide column; 7----Piston rod;

[0033] 71---pressure block; 8----first spring; 9----second spring;

[0034] 10---Pole piece to be tested; 20---First sealing ring; 30---Second sealing ring;

[0035] 40---the third sealing ring; 50---the fourth sealing ring; 60---the fifth sealing ring;

[0036] 70---end; 80---diaphragm retaining ring; 801--movable hole;

[0037] 90---Positioning plate; 901--Mounting hole. Implementation Method

[0038] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of the present invention to be protected.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of the embodiments of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely simplified descriptions for the convenience of describing the embodiments of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0043] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0044] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two elements or the interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0047] Furthermore, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0048] refer to Figures 1 to 4 As shown, the present invention discloses a single-pole piece detection fixture, comprising an upper fixture group 1, a middle shell 2 and a lower fixture group 3, which are matched in sequence from top to bottom, as well as a hard diaphragm 4, a reaction pole piece 5, a top piece 6, a piston rod 7, a first spring 8 and a second spring 9;

[0049] The middle shell 2 is provided with a central axis hole 21 for placing the electrode 10 to be tested, and a step portion 22 is provided on the side wall of one end of the central axis hole 21 facing the downward fixture assembly 3;

[0050] The upper fixture group 1 and the lower fixture group 3 are respectively movably and sealingly fitted at the upper and lower ends of the middle shell 2;

[0051] The hard diaphragm 4 is fitted on the step portion 22;

[0052] The reaction electrode 5 is fitted on the side of the hard diaphragm 4 facing downwards towards the fixture assembly 3 and is fixed by the top piece 6;

[0053] The piston rod 7 is movably and sealedly provided in the upper fixture assembly 1, with its inner end abutting against the electrode piece 10 to be tested in the central axis hole 21, and its outer end cooperating with the detection instrument to realize displacement detection of the piston rod 7, that is, to detect the thickness change of the electrode piece 10 to be tested;

[0054] The first spring 8 is provided between the upper fixture assembly 1 and the piston rod 7 to reset the piston rod 7 toward the pole piece 10 to be tested;

[0055] The second spring 9 is provided between the lower fixture assembly 3 and the top member 6 to reset the top member 6 toward the reaction electrode 5 .

[0056] Specific embodiments of the present invention are shown below.

[0057] The upper fixture assembly 1 comprises an upper shell 11, an upper screw cap 12, and an upper cover plate 13. The upper shell 11 covers the upper end surface of the middle shell 2. The upper screw cap 12 is threadedly connected to the upper end circumference of the middle shell 2 and axially limits the upper shell 11. The upper cover plate 13 is inserted through the upper screw cap 12 and fixedly connected to the upper shell 11, and is provided with an upper conductive rod 131. The piston rod 7 is movably and hermetically inserted through the upper shell 11. After the upper cover plate 13 is engaged with the upper shell 11, its axial position is fixed on the upper screw cap 12. By twisting the upper screw cap 12, the distance between the upper shell 11 and the middle shell 2 can be adjusted to close or open the upper shell 11.

[0058] Furthermore, the upper housing 11 is provided with at least two first locating pins 111 on the surface facing the middle housing 2; the middle housing 2 is provided with locating holes 23 (or slot-like structures) for the first locating pins 111 to pass through. The cooperation between the first locating pins 111 and the locating holes 23 guides the axial movement of the upper housing 11 relative to the middle housing 2, ensuring the coaxiality of the upper housing 11 and the middle housing 2, thereby preventing friction between the piston rod 7 and the central axial hole 21, which could affect the accuracy of the test data.

[0059] At the same time, a first sealing ring 20 and a second sealing ring 30 are respectively provided on the opposing surfaces of the upper shell 11 and the middle shell 2. The first sealing ring 20 and the second sealing ring 30 can ensure that the opposing surfaces of the upper shell 11 and the middle shell 2 have a good sealing effect after being fitted together.

[0060] Secondly, the upper shell 11 and the upper cover 13 are made of conductive materials, and the upper rotary cover 12 is made of insulating materials.

[0061] In addition, a plurality of first anti-slip grooves 121 are provided on the circumference of the upper screw cap 12 to increase friction and facilitate the user to twist the upper screw cap 12 .

[0062] The lower fixture assembly 3 comprises a lower housing 31, a lower screw cap 32, and a lower cover plate 33. The lower housing 31 covers the lower end surface of the middle housing 2. The lower screw cap 32 is threadedly connected to the lower end circumference of the middle housing 2 and axially limits the lower housing 31. The lower cover plate 33 passes through the lower screw cap 32 and is fixedly connected to the lower housing 31. A lower conductive rod 331 is disposed on the lower cover plate 33. After the lower cover plate 33 engages with the lower housing 31, its axial position is fixed on the lower screw cap 32. By twisting the lower screw cap 32, the distance between the lower housing 31 and the middle housing 2 can be adjusted to close or open the lower housing 31.

[0063] Furthermore, the lower housing 31 is provided with at least two second locating pins 311 on the side facing the middle housing 2. The middle housing 2 is provided with locating holes 23 (or a slot-like structure, which can be the same locating hole 23 that mates with the first locating pin 111, i.e., the locating hole 23 extends through both ends of the middle housing 2) for the second locating pins 311 to pass through. The cooperation between the second locating pins 311 and the locating holes 23 guides the axial movement of the lower housing 31 relative to the middle housing 2, ensuring the coaxiality of the lower housing 31 and the middle housing 2, thereby preventing friction between the piston rod 7 and the central axial hole 21, which could affect the accuracy of the test data.

[0064] At the same time, a third sealing ring 40 and a fourth sealing ring 50 are respectively provided on the opposing surfaces of the lower shell 31 and the middle shell 2. The third sealing ring 40 and the fourth sealing ring 50 can ensure that the opposing surfaces of the lower shell 31 and the middle shell 2 have a good sealing effect after being fitted together.

[0065] Secondly, the lower shell 31 and the lower cover 33 are made of conductive materials, and the lower rotary cover 32 is made of insulating material.

[0066] In addition, a plurality of second anti-slip grooves 321 are provided on the circumference of the lower screw cap 32 to increase friction and facilitate the user to twist the lower screw cap 32 .

[0067] The hard diaphragm 4 is a ceramic diaphragm for electrolysis.

[0068] The above-mentioned reaction electrode 5 and the electrode to be tested 10 are used in combination: when the electrode to be tested 10 is a positive electrode, the reaction electrode 5 is a negative electrode; conversely, when the electrode to be tested 10 is a negative electrode, the reaction electrode 5 is a positive electrode.

[0069] The upper jig assembly 1 (i.e., the upper shell 11) is provided with a through-hole 112 for the piston rod 7 to movably pass through. A plurality of fifth sealing rings 60 are sleeved on the circumference of the piston rod 7. The fifth sealing rings 60 are movably and tightly fitted on the side walls of the through-hole 112 to achieve a movable and sealed fit between the piston rod 7 and the upper jig (and the upper shell 11).

[0070] The inner end of the piston rod 7 is provided with a pressure block 71 to increase the end surface area of the inner end of the piston rod 7, so that the piston rod 7 can more comprehensively press the electrode piece 10 to be tested onto the hard diaphragm 4, thereby increasing the contact area between the electrode piece 10 to be tested and the end surface of the piston rod 7, thereby improving the detection accuracy; the two ends of the first spring 8 abut against the inner side surface of the upper shell 11 and the end surface of the pressure block 71.

[0071] The outer end of the piston rod 7 is provided with a tip 70 for cooperating with a detection instrument.

[0072] A diaphragm retaining ring 80 is provided at one end of the above-mentioned central axis hole 21 facing the downward jig group 3, which is used to axially limit the hard diaphragm 4; the diaphragm retaining ring 80 is provided with a movable hole 801 for the top piece 6 to movably pass through, so that the diaphragm retaining ring 80 can not only limit the hard diaphragm 4, but also guide the axial movement of the top piece 6.

[0073] Furthermore, the diaphragm retaining ring 80 is threadedly connected to the central axis hole 21 , so that the diaphragm retaining ring 80 is axially limited in the central axis hole 21 through the threads therebetween, thereby limiting the hard diaphragm 4 .

[0074] A guide post 61 is provided at one end of the top member 6 facing the lower fixture assembly 3 (ie, the lower shell 31 ); the second spring 9 is sleeved on the guide post 61 to ensure the stability of the second spring 9 in the extension and contraction direction.

[0075] A positioning plate 90 is provided on the lower end surface of the lower fixture assembly 3 . The positioning plate 90 is provided with mounting holes 901 to achieve positioning and mounting of the entire fixture on the testing equipment.

[0076] The use process of the present invention is:

[0077] Place the entire fixture in the glove box for operation. The first step is to turn the middle shell 2 upside down, place the hard diaphragm 4 into the step part of the middle shell 2, and then fix the hard diaphragm 4 with the diaphragm retaining ring 80, drip a few drops of electrolyte, and then put in the reaction electrode 5, and then put in the top piece 6 to support the reaction electrode 5, and then cover the upper and lower fixture groups 3 and tighten them, and a sealed chamber is formed below; then drip electrolyte on the top of the hard diaphragm 4, and then put in the electrode to be tested 10, and then cover the upper fixture group 1 with the piston rod 7, press the electrode to be tested 10 with the inner end of the piston rod 7 and tighten the upper fixture group 1, and a sealed chamber is formed above. By squeezing the second spring 9 mounted on the top member 6, the reaction electrode 5 below creates a passage through the lower shell 31, the lower cover 33 and the lower conductive rod 331, and the electrode to be tested above forms a passage through the upper shell 11, the upper cover 13 and the upper conductive rod 131. The upper conductive rod 131 and the lower conductive rod 331 are then connected to an external charging and discharging device to start testing.

[0078] Through the above scheme, the present invention separates the electrode piece to be tested 10 and the reaction electrode piece 5 by the hard diaphragm 4. The thickness change of the reaction electrode piece 5 will not affect the measurement of the thickness change of the electrode piece to be tested 10, so that the detection fixture can detect the thickness change of the electrode piece to be tested 10 in a targeted manner, and the detection of a single electrode piece is more accurate and targeted; the electrode piece to be tested 10 and the reaction electrode piece 5 are given a certain amount of pressure by the piston rod 7 and the top piece 6 respectively, so that the two are respectively attached to the upper and lower surfaces of the hard diaphragm 4, ensuring complete reaction and the accuracy of the detection results.

[0079] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A single-pole piece detection fixture, characterized by: It includes an upper fixture group, a middle shell and a lower fixture group, which are matched in sequence from top to bottom, as well as a hard diaphragm, a reaction electrode, a top piece, a piston rod, a first spring and a second spring; The middle shell is provided with a central axis hole for placing the electrode to be tested, and a side wall of one end of the central axis hole facing the lower fixture assembly is provided with a step portion; The upper fixture group and the lower fixture group are respectively movably and sealingly matched at the upper and lower ends of the middle shell; The hard diaphragm is fitted on the step portion; The reaction electrode is fitted on the side of the hard diaphragm facing the lower fixture assembly and is fixed by the top piece; The piston rod is movably and sealingly provided in the upper fixture assembly, and the inner end portion thereof abuts against the electrode to be tested in the central axis hole; The first spring is arranged between the upper fixture assembly and the piston rod; The second spring is arranged between the lower fixture assembly and the top member; A diaphragm retaining ring for axially limiting the hard diaphragm is provided at one end of the central axis hole facing the lower fixture assembly; the diaphragm retaining ring is provided with a movable hole for the top piece to movably penetrate; The upper fixture assembly includes an upper shell, an upper screw cover, and an upper cover plate; the upper shell covers the upper end surface of the middle shell; the upper screw cover is threadedly connected to the upper end circumference of the middle shell and axially limits the upper shell; the upper cover plate is passed through the upper screw cover and fixedly connected to the upper shell, and an upper conductive rod is provided on the upper cover plate; the piston rod is movably and sealedly passed through the upper shell; At least two first positioning pins are provided on a side of the upper shell facing the middle shell; the middle shell is provided with positioning holes for the first positioning pins to pass through; The lower fixture group includes a lower shell, a lower screw cover and a lower cover plate; the lower shell covers the lower end surface of the middle shell; the lower screw cover is threadedly connected to the lower end circumference of the middle shell and axially limits the lower shell; the lower cover plate is passed through the lower screw cover and fixedly connected to the lower shell, and a lower conductive rod is provided on it.

2. The monopole testing jig according to claim 1, characterized in that: The diaphragm clamping ring is threadedly connected to the central shaft hole.

3. The monopole testing jig according to claim 1, characterized in that: At least two second positioning pins are provided on a side of the lower shell facing the middle shell; and the middle shell is provided with positioning holes for the second positioning pins to pass through.

4. The monopole testing jig according to claim 1, characterized in that: The hard diaphragm is a ceramic diaphragm for electrolysis.

5. The monopole testing jig according to claim 1, characterized in that: The upper fixture assembly is provided with a through hole for the piston rod to movably pass through.

6. The monopole testing jig according to claim 1, characterized in that: The inner end of the piston rod is provided with a pressure block; the two ends of the first spring abut against the inner side surface of the upper shell and the end surface of the pressure block.

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