Electrochemical impedance test device and test board

Abstract

The utility model relates to the technical field of electrochemical impedance testing, in particular to an electrochemical impedance testing device and a testing board, the electrochemical impedance testing device comprises an electrochemical workstation, a working electrode, a feedback electrode, an auxiliary electrode, a reference electrode and two duplex banana plugs, and each duplex banana plug is provided with two electrodes. The two duplex banana plugs comprise a first duplex banana plug and a second duplex banana plug, one ends of the working electrode and the feedback electrode are respectively connected with two electrodes of the first duplex banana plug, the other ends of the working electrode and the feedback electrode are connected with the electrochemical workstation, one ends of the auxiliary electrode and the reference electrode are respectively connected with two electrodes of the second duplex banana plug, and the other ends of the auxiliary electrode and the reference electrode are respectively connected with the electrochemical workstation. The other end of the first duplex banana plug is connected with an electrochemical workstation, each electrode of the first duplex banana plug is connected with a first lead, and each electrode of the second duplex banana plug is connected with a second lead. According to the utility model, the influence of contact resistance is eliminated, and the accuracy of impedance test results is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemistry impedance test technical field, concretely relates to a kind of electrochemistry impedance test device and test board. BACKGROUND

[0002] Lithium ion battery often appears different failure in application process, electrochemistry impedance as a kind of wide frequency, high accuracy and non-destructive electrochemistry diagnostic tool, its electrochemistry impedance spectrum can feedback electrode kinetics process in battery, including charge transfer reaction, interface evolution and mass diffusion.

[0003] As Figure 1 As shown in, existing button cell 9 carries out electrochemistry impedance test, working electrode 4 (WE) and feedback electrode 5 (S) are connected, auxiliary electrode 6 (CE) and reference electrode 7 (RE) are connected, working electrode 4 and auxiliary electrode 6 form loop, measure the current flowing through button cell 9, feedback electrode 5 and reference electrode 7 form loop, measure the voltage difference between the two ends of button cell 9, to measure the impedance of button cell 9, but working electrode 4 and feedback electrode 5, auxiliary electrode 6 and reference electrode 7 are connected by connecting head 13, easy to produce contact resistance, electrochemistry impedance spectrum is difficult to reproduce, reduce the accuracy of impedance test result. UTILITY MODEL CONTENT

[0004] The utility model aims at the defects of prior art, provides a kind of electrochemistry impedance test device and test board, eliminate the influence of contact resistance, improve the accuracy of impedance test result.

[0005] In order to solve the above technical problem, first, the utility model provides a kind of electrochemistry impedance test device, including electrochemistry workstation, working electrode, feedback electrode, auxiliary electrode, reference electrode and two double banana plugs, two described double banana plugs are provided with two electrodes, two described double banana plugs include first double banana plug and second double banana plug, one end of working electrode and feedback electrode is connected with the two electrodes of first double banana plug respectively, the other end of working electrode and feedback electrode is connected with electrochemistry workstation, one end of auxiliary electrode and reference electrode is connected with the two electrodes of second double banana plug respectively, the other end of auxiliary electrode and reference electrode is connected with electrochemistry workstation, every electrode of first double banana plug is connected with a first wire, and the first wire is used to connect with the positive pole of battery, every electrode of second double banana plug is connected with a second wire, and the second wire is used to connect with the negative pole of battery.

[0006] The utility model discloses two duplex banana plugs are used to connect the working electrode, feedback electrode, auxiliary electrode, reference electrode with the battery to be measured respectively, eliminate the contact resistance influence between the working electrode and feedback electrode, between auxiliary electrode and reference electrode, improve the accuracy of impedance test result.

[0007] Further, the working electrode, the feedback electrode, the auxiliary electrode and the reference electrode are connected with the duplex banana plug through the connecting head, and the connecting head comprises a banana plug.

[0008] The working electrode, the feedback electrode, the auxiliary electrode and the reference electrode are connected with the duplex banana plug through the banana plug, and the contact area between the banana plug and the duplex banana plug is large, thereby further reducing the contact resistance.

[0009] Further, the duplex banana plug comprises a shell, two insertion holes are formed in the shell, and two electrodes are fixedly arranged in the insertion holes, and only one end of the electrode extends out of the insertion hole.

[0010] In some embodiments, the banana plug of the working electrode, the feedback electrode, the auxiliary electrode and the reference electrode is inserted into the insertion hole and connected with the electrode.

[0011] In some embodiments, a connecting hole is arranged at the tail of the connecting head, and the electrode is inserted into the connecting hole.

[0012] The working electrode, the feedback electrode, the auxiliary electrode and the reference electrode can be connected with the battery by being inserted into the insertion hole of the duplex banana plug, and the electrode of the duplex banana plug can also be inserted into the connecting hole of the working electrode, the feedback electrode and the auxiliary electrode, so that the working electrode, the feedback electrode, the auxiliary electrode and the reference electrode are connected with the battery.

[0013] In some embodiments, a test clamp is arranged, and the test clamp comprises two clamping surfaces, a first conductor and a second conductor are arranged on the two clamping surfaces respectively, and the first conductor and the second conductor are connected with the first wire and the second wire respectively.

[0014] The utility model discloses a test clamp, which is convenient for electrochemical impedance testing of the button cell.

[0015] Further, the first conductor and the second conductor are both plate-shaped.

[0016] The first conductor and the second conductor are both plate-shaped, which can increase the contact area of the first conductor and the second conductor with the button cell and further reduce the contact resistance.

[0017] The utility model provides a test board, including the board body, a plurality of double banana plugs are arranged in the board body, a plurality of battery fixing devices are arranged on the board body, one battery fixing device corresponds two double banana plugs, the electrode of double banana plug is connected through the wire with battery fixing device, and the battery fixing device is used for fixing battery and connects battery with working electrode, feedback electrode, auxiliary electrode, reference electrode.

[0018] The test board can realize simultaneous testing of multiple batteries, and improve the testing efficiency.

[0019] Further, a plurality of pressing plates and a plurality of placing grooves are arranged on the upper end surface of the board body, one pressing plate and one placing groove correspond to two double banana plugs, the placing groove is used for placing the battery, the pressing plate is elastically connected with the board body, the pressing plate is used for pressing the battery in the placing groove, a first conductor is arranged on the side of the pressing plate facing the placing groove, and a second conductor is arranged at the bottom of the placing groove.

[0020] The utility model discloses a pressing plate and a placing groove are arranged, so that the button cell or the symmetrical battery can be fixed in the placing groove, and the fixing during the testing process is facilitated.

[0021] Further, the size of the first conductor can cover the placing groove, and the second conductor covers the bottom of the placing groove.

[0022] By limiting the size of the first conductor and the second conductor, the contact area of the first conductor and the second conductor with the button cell can be improved, and the contact resistance can be reduced.

[0023] The utility model discloses the working electrode, feedback electrode, auxiliary electrode, reference electrode are connected with the battery to be measured respectively by two double banana plugs, the contact resistance influence between working electrode and feedback electrode, auxiliary electrode and reference electrode is eliminated, and the accuracy of impedance test result is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure schematic diagram of measuring the impedance of button cell in the prior art;

[0025] Figure 2 It is the structure schematic diagram of electrochemical impedance test device of the utility model;

[0026] Figure 3 It is the structure schematic diagram of double banana plug of the utility model;

[0027] Figure 4 It is the structure schematic diagram of test board of the utility model.

[0028] Figure 5 The results of continuously testing the button cell three times by using the method in the prior art;

[0029] Figure 6 The results of continuously testing the button cell three times by using the electrochemical impedance testing device of the utility model.

[0030] The figure mark: 1-test clamp;21-first wire;22-second wire;3-double banana plug;31-housing;32-electrode;33-jack;4-working electrode;5-feedback electrode;6-assistant electrode;7-reference electrode;8-electrochemical workstation;9-button cell;10-plate body;11-put slot;12-pressing plate;13-connector. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical schemes and beneficial effects to be solved in the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0032] As Figure 2 The utility model provides a kind of electrochemical impedance testing device, including electrochemical workstation 8, working electrode 4, feedback electrode 5, auxiliary electrode 6, reference electrode 7 and two double banana plugs 3, as Figure 3 As shown in the figure, two double banana plugs 3 are provided with two electrodes 32, and two double banana plugs 3 include first double banana plug and second double banana plug, as Figure 2 As shown in the figure, one end of working electrode 4 and feedback electrode 5 is respectively connected with the two electrodes 32 of first double banana plug, and the other end of working electrode 4 and feedback electrode 5 is connected with electrochemical workstation 8, one end of auxiliary electrode 6 and reference electrode 7 is respectively connected with the two electrodes 32 of second double banana plug, and the other end of auxiliary electrode 6 and reference electrode 7 is connected with electrochemical workstation 8, each electrode 32 of first double banana plug is connected with a first wire 21, and the first wire 21 is used to connect with the positive pole of battery, that is, first double banana plug is connected with the positive pole of battery by two first wires 21, each electrode 32 of second double banana plug is connected with a second wire 22, and the second wire 22 is used to connect with the negative pole of battery, that is, second double banana plug is connected with the negative pole of battery by two second wires 22.

[0033] It can be understood that the double banana plug 3 has two independent connection channels, and the two double banana plugs 3 can respectively connect the working electrode 4, the feedback electrode 5, the auxiliary electrode 6 and the reference electrode 7 with the battery to be measured, so that the influence of the contact resistance between the working electrode 4 and the feedback electrode 5 and the contact resistance between the auxiliary electrode 6 and the reference electrode 7 is eliminated, and the accuracy of the impedance test result is improved.

[0034] As shown in Figure 5 , it is the result of continuously testing the button cell 9 three times by using the method in the prior art, and the results of the three tests are quite different, the repeatability is poor, and the Rs impedance is large, as shown in Figure 6 , it is the result of continuously testing the button cell 9 three times by using the electrochemical impedance test device of the utility model, and it can be found that the results of the three tests are basically coincident, the repeatability is good, and the Rs impedance is very small.

[0035] Further, the working electrode 4, the feedback electrode 5, the auxiliary electrode 6 and the reference electrode 7 are connected with the double banana plug 3 through the connecting head 13, and the connecting head 13 includes a banana plug. The contact area between the banana plug and the double banana plug 3 is large, and the contact resistance is further reduced.

[0036] Further, as shown in Figure 3 , the double banana plug 3 includes a shell 31, the shell 31 is provided with two insertion holes 33, and two electrodes 32 are fixedly arranged in the insertion holes 33, and the electrodes 32 only extend out of the insertion holes 33 at one end.

[0037] In some embodiments, the banana plugs of the working electrode 4, the feedback electrode 5, the auxiliary electrode 6 and the reference electrode 7 are inserted into the insertion holes 33 and connected with the electrodes 32.

[0038] In some embodiments, the tail of the connecting head 13 is provided with a connecting hole, and the electrode 32 is inserted into the connecting hole.

[0039] It can be understood that, since the double banana plug 3 is provided with the insertion hole 33 and the connecting head 13 is provided with the connecting hole, the working electrode 4, the feedback electrode 5, the auxiliary electrode 6 and the reference electrode 7 can be connected with the battery by being inserted into the insertion hole 33 of the double banana plug 3, or the electrode 32 of the double banana plug 3 is inserted into the connecting hole of the working electrode 4, the feedback electrode 5 and the auxiliary electrode 6, so that the working electrode 4, the feedback electrode 5, the auxiliary electrode 6 and the reference electrode 7 are connected with the battery.

[0040] In some embodiments, as shown in Figure 2 , it includes a test clamp 1, the test clamp 1 includes two clamping surfaces, a first conductor and a second conductor are arranged on the two clamping surfaces respectively, and the first conductor and the second conductor are connected with the first lead 21 and the second lead 22 respectively. The test clamp 1 can adopt an alligator clip.

[0041] Further, the first conductor and the second conductor are both plate-shaped. Since the first conductor and the second conductor are both plate-shaped, the contact area of the first conductor and the second conductor with the button cell 9 can be increased, and the contact resistance can be further reduced.

[0042] As shown in Figure 4 The utility model also provides a test board, including board body 10, a plurality of double banana plugs 3 are arranged in board body 10, a plurality of battery fixing devices are arranged on board body 10, and one battery fixing device corresponds to two double banana plugs 3, the electrode 32 of double banana plug 3 is connected with battery fixing device through wire, and battery fixing device is used to fix battery and connect battery with working electrode 4, feedback electrode 5, auxiliary electrode 6, reference electrode 7. Since a plurality of double banana plugs 3 and a plurality of battery fixing devices are arranged, the simultaneous test of a plurality of batteries can be realized, and the test efficiency is improved.

[0043] Further, a plurality of pressing plates 12 and a plurality of placing grooves 11 are arranged on the upper end face of the board body 10, Figure 4 Only one pressing plate 12 is shown in the figure, one pressing plate 12 and one placing groove 11 correspond to two double banana plugs 3, the placing groove 11 is used to place the battery, the pressing plate 12 is elastically connected with the board body 10, a torsional spring can be used to elastically connect the pressing plate 12 with the board body 10, the pressing plate 12 is used to press the battery in the placing groove 11, and a first conductor is arranged on the side of the pressing plate 12 facing the placing groove 11, and a second conductor is arranged on the bottom of the placing groove 11.

[0044] By arranging the pressing plate 12 and the placing groove 11, the button cell 9 or the symmetrical cell can be fixed in the placing groove 11, which is convenient for fixing during the test process. The depth of the placing groove 11 is determined according to the length or thickness of the battery to be tested.

[0045] Further, the size of the first conductor can cover the placing groove 11, and the second conductor covers the bottom of the placing groove 11.

[0046] It can be understood that the size of the first conductor can cover the placing groove 11, which can ensure that the contact area of the first conductor with the upper end of the battery in the placing groove 11 is maximum, the second conductor covers the bottom of the placing groove 11, which can ensure that the contact area of the second conductor with the lower end of the battery in the placing groove 11 is maximum, the contact resistance is reduced, and the accuracy of the impedance test result is improved.

[0047] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An electrochemical impedance testing device, characterized by: The utility model provides an electrochemical workstation (8), working electrode (4), feedback electrode (5), auxiliary electrode (6), reference electrode (7) and two double banana plugs (3), two double banana plugs (3) are provided with two electrodes (32), two double banana plugs (3) include first double banana plug and second double banana plug, one end of working electrode (4) and feedback electrode (5) is connected with two electrodes (32) of first double banana plug respectively, the other end of working electrode (4) and feedback electrode (5) is connected with electrochemical workstation (8), one end of auxiliary electrode (6) and reference electrode (7) is connected with two electrodes (32) of second double banana plug respectively, the other end of auxiliary electrode (6) and reference electrode (7) is connected with electrochemical workstation (8), every electrode (32) of first double banana plug is connected with a first wire (21), and the first wire (21) is used for being connected with the positive pole of battery, every electrode (32) of second double banana plug is connected with a second wire (22), and the second wire (22) is used for being connected with the negative pole of battery.

2. The electrochemical impedance test device of claim 1, wherein: The working electrode (4), the feedback electrode (5), the auxiliary electrode (6) and the reference electrode (7) are connected with the double banana plug (3) through the connecting head (13), and the connecting head (13) comprises a banana plug.

3. The electrochemical impedance test device of claim 2, wherein: The double banana plug (3) comprises a shell (31), two insertion holes (33) are formed in the shell (31), and two electrodes (32) are fixedly arranged in the insertion holes (33) respectively, and the electrodes (32) only extend out of the insertion holes (33) at one end.

4. The electrochemical impedance test device of claim 3, wherein: The banana plugs of the working electrode (4), the feedback electrode (5), the auxiliary electrode (6) and the reference electrode (7) are inserted into the insertion holes (33) and connected with the electrodes (32).

5. The electrochemical impedance test device of claim 3, wherein: The tail of the connecting head (13) is provided with a connecting hole, and the electrode (32) is inserted into the connecting hole.

6. The electrochemical impedance test device according to any one of claims 1 to 5, wherein: The test clamp (1) comprises two clamping surfaces, a first conductor and a second conductor are arranged on the two clamping surfaces respectively, and the first conductor and the second conductor are connected with the first wire (21) and the second wire (22) respectively.

7. The electrochemical impedance test device of claim 6, wherein: The first conductor and the second conductor are in the form of plates.

8. A test plate for an electrochemical impedance test device according to any one of claims 1 to 7, characterized in that: The utility model provides a board body (10), a plurality of double banana plugs (3) are arranged in the board body (10), a plurality of battery fixing devices are arranged on the board body (10), one battery fixing device corresponds to two double banana plugs (3), the electrodes (32) of the double banana plugs (3) are connected with the battery fixing devices through wires, and the battery fixing devices are used for fixing batteries and connecting the batteries with the working electrode (4), the feedback electrode (5), the auxiliary electrode (6) and the reference electrode (7).

9. The test panel of claim 8, wherein: The upper end surface of the plate body (10) is provided with a plurality of pressing plates (12) and a plurality of placing grooves (11), one pressing plate (12) and one placing groove (11) correspond to two double banana plugs (3), the placing groove (11) is used for placing a battery, the pressing plate (12) is elastically connected with the plate body (10), the pressing plate (12) is used for pressing the battery in the placing groove (11), the side of the pressing plate (12) facing the placing groove (11) is provided with a first conductor, and the bottom of the placing groove (11) is provided with a second conductor.

10. The test panel of claim 9, wherein: The first conductor is sized to cover the placing groove (11), and the second conductor covers the bottom of the placing groove (11).

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