CN217786980U

CN217786980U - In-situ electrochemical testing device for lithium ion battery

Info

Publication number: CN217786980U
Application number: CN202221901980.9U
Authority: CN
Inventors: 杨程凯; 杨康; 张巧丽; 于岩
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2022-11-11
Anticipated expiration: 2032-07-21

Abstract

The utility model discloses an in-situ electrochemical testing device for a lithium ion battery, which comprises a base, a glass window sheet, a top cover, a gas collecting piece and two connecting pieces; the upper end of the base is provided with a mounting groove; a test slot is arranged on the base in the mounting groove; the glass window sheet is covered at the bottom of the mounting groove; the top cover is provided with an observation port; connecting holes are formed in the two sides of the base; the connecting piece comprises a connecting knob and a conductive metal rod; the connecting knob is tightly sleeved outside the conductive metal rod and is in threaded connection with the connecting hole; the inner end of the conductive metal rod is abutted against the electrode material, and the outer end of the conductive metal rod is connected with the electrochemical workstation; the base is provided with an air detecting hole; the gas collecting piece comprises an inner tube, a silica gel gasket and an outer tube; the inner end of the inner pipe is in threaded connection with the gas detection hole, and a gasket groove is formed in the inner edge of the outer end of the inner pipe; the silica gel gasket is placed in the gasket groove; the inner end of the outer pipe is in threaded connection with the inner pipe and compresses the silica gel gasket.

Description

In-situ electrochemical testing device for lithium ion battery

Technical Field

The utility model relates to a check out test set technical field, specific normal position electrochemistry testing arrangement for lithium ion battery that says so.

Background

With the increasing demand of people for rechargeable secondary batteries with high energy density in recent years, novel energy storage devices mainly comprising lithium ion batteries are rapidly developed in the fields of numerous electronic devices, electric vehicles and the like, and in order to pursue higher energy density, cycle life and safer performance, it is necessary to use an effective means to test and characterize the batteries.

The electrodes have different tissue morphologies and chemical properties at various stages of participation in the electrochemical reaction, and key factors influencing the cycle life and the safety performance of the battery are often contained in the changes. In order to observe and test the whole process of the electrode, various in-situ electrochemical testing means are applied to the electrode, including in-situ microscopic imaging, in-situ Raman spectroscopy, in-situ X-ray diffraction and the like. The in-situ microscopic imaging technology can directly observe the growth condition of dendrites on the side surface of an electrode in a metal ion battery under an optical microscope, understand the diffusion speed of metal ions on the surface of an electrode plate and the decomposition condition of electrolyte, and analyze key problems related to the electrochemical performance of the battery.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an normal position electrochemistry testing arrangement for lithium ion battery, this an in-situ electrochemistry testing arrangement accessible viewing aperture for lithium ion battery observes electrode material surface state at electrochemical reaction's in-process normal position, can be used to carry out the normal position to the electrode material surface dendritic crystal growth of metal ion battery and observe, and the accessible syringe needle passes the silica gel gasket and takes out the gas in the electrolyte bubble and detect, both can be at the in-process accurate analysis electrode's of normal position optics observation electrochemical performance, can be at in-situ detection gas production again in the testing process.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an in-situ electrochemical testing device for a lithium ion battery comprises a base, a glass window, a top cover, a gas collecting piece and two connecting pieces; the upper end of the base is provided with a mounting groove; a test slot is arranged on the base in the mounting slot, and the electrode material to be tested and the electrolyte are placed into the test slot; the glass window sheet is covered at the bottom of the mounting groove; the middle part of the top cover is provided with an observation port, the top cover is in threaded connection with the mounting groove, and the bottom of the top cover is tightly propped against the glass window sheet; connecting holes communicated with the test slots are formed in two sides of the base respectively; the connecting piece comprises a connecting knob and a conductive metal rod; the connecting knob is tightly sleeved outside the conductive metal rod and is in threaded connection with the connecting hole; the inner end of the conductive metal rod is tightly propped against the electrode material, and the outer end of the conductive metal rod is connected with the electrochemical workstation; the side edge of the base is provided with an air detecting hole communicated with the test slot; the gas collecting piece comprises an inner tube, a silica gel gasket and an outer tube; the inner end of the inner pipe is in threaded connection with the gas detection hole, and a gasket groove is formed in the inner edge of the outer end of the inner pipe; the silica gel gasket is placed in the gasket groove; the inner end of the outer pipe is in threaded connection with the inner pipe and tightly presses the silica gel gasket, and the gas collecting needle tube penetrates through the silica gel gasket to collect gas in the test groove.

Further, the side edge of the base is provided with a mounting hole communicated with the test slot; a reference electrode is arranged in the mounting hole; an installation knob is tightly sleeved outside the reference electrode; the mounting knob is in threaded connection with the mounting hole, and the inner end of the reference electrode is tightly abutted against the electrode material by rotating the mounting knob.

Furthermore, the in-situ electrochemical testing device for the lithium ion battery further comprises at least one sealing knob, wherein the sealing knob is in threaded connection with the air detecting hole and the mounting hole respectively, and the air detecting hole or the mounting hole is sealed through the sealing knob.

Furthermore, a sealing ring is tightly clamped between the glass window piece and the top cover, and the upper end edge of the glass window piece is sealed through the sealing ring.

Furthermore, a rotary notch is formed in the top cover on the side edge of the observation port, and an auxiliary tool is embedded into the rotary notch to rotate the top cover.

After the technical scheme is adopted, the utility model discloses following beneficial effect has:

1. the utility model relates to an normal position electrochemistry testing arrangement for lithium ion battery, accessible viewing aperture observe electrode material surface state at electrochemical reaction's in-process normal position, can be used to carry out the normal position to the growth of the electrode material surface dendrite of metal ion battery and observe, and the accessible syringe needle passes the silica gel gasket and takes out the gas in the electrolyte bubble out and detect, both can be at the in-process accurate analysis electrode's of normal position optics observation electrochemistry performance, can be at the testing process normal position detection gas product again.

2. The utility model relates to an normal position electrochemistry testing arrangement for lithium ion battery, with normal position optics test, three electrode test and gaseous detection integration in a test inslot, can characterize the multiple nature of electrode simultaneously, more be favorable to discovering electrode material at the truest state of participating in the reaction.

3. The utility model relates to an normal position electrochemistry testing arrangement for lithium ion battery has not only saved because different tests will change the time that different devices consumed, also has easy operation, and be liable to change, advantages such as seal are good.

Drawings

FIG. 1 is an exploded view of the present invention;

fig. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic view of the structure of the present invention without the glazing unit and the top cover;

fig. 4 is the structural schematic diagram of the sectioning of the utility model.

The reference numbers in the figures denote:

1. a base; 10. mounting grooves; 11. a test slot; 12. connecting holes; 13. detecting air holes; 14. mounting holes; 2. a glazing panel; 3. a top cover; 30. a viewing port; 31. a rotary notch; 4. a gas collection member; 40. an inner tube; 400. a gasket groove; 41. a silica gel gasket; 42. an outer tube; 5. a connecting member; 50. a connecting knob; 51. a conductive metal rod; 6. a reference electrode; 60. installing a knob; 7. a seal ring; 8. and sealing the knob.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 to 4, an in-situ electrochemical testing apparatus for a lithium ion battery includes a base 1, a glass window 2, a top cover 3, a gas collecting member 4, and two connecting members 5; the upper end of the base 1 is provided with a mounting groove 10; a test slot 11 is arranged on the base 1 in the mounting groove 10, and electrode materials to be tested and electrolyte are placed in the test slot 11; the glass window 2 is covered at the bottom of the mounting groove 10; the middle part of the top cover 3 is provided with an observation port 30, the top cover 3 is in threaded connection with the mounting groove 10, and the bottom of the top cover 3 is tightly abutted against the glass window piece 2; two sides of the base 1 are respectively provided with a connecting hole 12 communicated with the test slot 11; the connecting piece 5 comprises a connecting knob 50 and a conductive metal rod 51; the connecting knob 50 is tightly sleeved outside the conductive metal rod 51 and is in threaded connection with the connecting hole 12; the inner end of the conductive metal rod 51 is tightly abutted against the electrode material, and the outer end of the conductive metal rod 51 is connected with the electrochemical workstation; the side edge of the base 1 is provided with an air detecting hole 13 communicated with the test slot 11; the gas collecting part 4 comprises an inner tube 40, a silica gel gasket 41 and an outer tube 42; the inner end of the inner tube 40 is in threaded connection with the gas detection hole 13, and a gasket groove 400 is formed in the inner edge of the outer end of the inner tube 40; the silica gel gasket 41 is placed in the gasket groove 400; the inner end of the outer tube 42 is in threaded connection with the inner tube 40 and presses the silica gel gasket 41 tightly, and the air in the test slot 11 is collected by the needle penetrating through the silica gel gasket 41.

As shown in fig. 1 to 4, a mounting hole 14 communicated with the test slot 11 is formed in a side edge of the base 1; a reference electrode 6 is arranged in the mounting hole 14; the outside of the reference electrode 6 is tightly sleeved with a mounting knob 60; the mounting knob 60 is in threaded connection with the mounting hole 14, and the inner end of the reference electrode 6 is tightly abutted against the electrode material by rotating the mounting knob 60.

As shown in fig. 1 to 4, an in-situ electrochemical testing device for a lithium ion battery further includes at least one sealing knob 8, the sealing knob 8 is respectively in threaded connection with a gas detection hole 13 and a mounting hole 14, the gas detection hole 13 or the mounting hole 14 is sealed by the sealing knob 8, the gas collection member 4 can be sealed by the sealing knob 8 after being removed, the mounting hole 14 can be sealed by the sealing knob 8 after the reference electrode 6 and the mounting knob 60 are removed, whether the gas detection hole 13 or the mounting hole 14 is sealed by the sealing knob 8 can be selected according to actual testing requirements, and flexibility is good.

As shown in fig. 1 and 4, a gasket 7 is tightly interposed between the glass pane 2 and the top cover 3, and the upper edge of the glass pane 2 is sealed by the gasket 7.

As shown in fig. 1, 2 and 4, a rotation notch 31 is formed on the top cover 3 at the side of the viewing port 30, and an auxiliary tool is inserted into the rotation notch 31 to rotate the top cover 3.

The working principle of the utility model is as follows:

before use, all accessories are cleaned by using ethanol and deionized water, are dried and then are assembled, if a test atmosphere is required to be ensured, the accessories need to be assembled in an argon-filled glove box, electrode materials are firstly cut during assembly, the electrode materials are laterally placed in a test groove 11 in a base 1, and the electrode materials are fixed through pressure applied when a connecting knob 50 and a conductive metal rod 51 are screwed inwards. Next, the gas detection hole 13 and the mounting hole 14 of the base 1 are tightly sealed, and when the reference electrode 6 is required to be mounted, the mounting hole 14 is connected to the mounting hole 60 by the mounting knob 60, and when the gas collecting member 4 is not required to be mounted, the gas detection hole 13 can be sealed by the sealing knob 8, and when the reference electrode 6 is not required to be mounted, the mounting hole 14 can be sealed by the sealing knob 8. Then, electrolyte is injected into the test groove 11 to submerge the electrode material, the glass window piece 2 and the sealing ring 7 are sequentially put in, and the top cover 3 is screwed tightly. During testing, the assembled device is transversely placed under an optical microscope, and the conductive metal rods 51 and the reference electrode 6 on the two sides are externally connected with an electrochemical workstation, so that the purpose of in-situ observation of the surface state of the electrode in the electrochemical reaction process is achieved, and the device can be used for in-situ observation of the growth of dendrites (such as lithium dendrites and zinc dendrites) on the surface of the electrode of a metal ion battery. And in the electrochemical test stage, bubbles on the surface of the electrode material are observed to escape, at this time, the micro needle can pierce the silica gel gasket 41 to penetrate into the device to extract and detect the gas, the silica gel gasket 41 can still better keep the tightness of the device after the needle is extracted, and the extraction of trace gas generated in the electrochemical process of the electrode material can be detected.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An in-situ electrochemical testing device for lithium ion batteries, characterized by: comprises a base (1), a glass window sheet (2), a top cover (3), a gas collecting piece (4) and two connecting pieces (5); the upper end of the base (1) is provided with a mounting groove (10); a test slot (11) is arranged on the base (1) in the mounting groove (10), and electrode materials to be tested and electrolyte are placed in the test slot (11); the glass window sheet (2) is covered at the bottom of the mounting groove (10); the middle part of the top cover (3) is provided with an observation port (30), the top cover (3) is in threaded connection with the mounting groove (10), and the bottom of the top cover is tightly abutted against the glass window sheet (2); two sides of the base (1) are respectively provided with a connecting hole (12) communicated with the test slot (11); the connecting piece (5) comprises a connecting knob (50) and a conductive metal rod (51); the connecting knob (50) is tightly sleeved outside the conductive metal rod (51) and is in threaded connection with the connecting hole (12); the inner end of the conductive metal rod (51) is tightly abutted against the electrode material, and the outer end of the conductive metal rod (51) is connected with the electrochemical workstation; the side edge of the base (1) is provided with an air checking hole (13) communicated with the test slot (11); the gas collecting piece (4) comprises an inner tube (40), a silica gel gasket (41) and an outer tube (42); the inner end of the inner pipe (40) is in threaded connection with the gas detection hole (13), and a gasket groove (400) is formed in the inner edge of the outer end of the inner pipe (40); the silica gel gasket (41) is placed in the gasket groove (400); the inner end of the outer tube (42) is in threaded connection with the inner tube (40) and compresses the silica gel gasket (41), and the needle penetrates through the silica gel gasket (41) to collect gas in the test slot (11).

2. The in situ electrochemical testing apparatus for lithium ion batteries according to claim 1, wherein: the side edge of the base (1) is provided with a mounting hole (14) communicated with the test slot (11); a reference electrode (6) is arranged in the mounting hole (14); a mounting knob (60) is tightly sleeved outside the reference electrode (6); the mounting knob (60) is in threaded connection with the mounting hole (14), and the inner end of the reference electrode (6) is tightly abutted against the electrode material by rotating the mounting knob (60).

3. An in-situ electrochemical testing apparatus for lithium-ion batteries according to claim 2, wherein: the gas detection device is characterized by further comprising at least one sealing knob (8), wherein the sealing knob (8) is in threaded connection with the gas detection hole (13) and the mounting hole (14) respectively, and the gas detection hole (13) or the mounting hole (14) is sealed through the sealing knob (8).

4. The in situ electrochemical testing apparatus for lithium ion batteries according to claim 1, wherein: and a sealing ring (7) is tightly clamped between the glass window sheet (2) and the top cover (3), and the edge of the upper end of the glass window sheet (2) is sealed through the sealing ring (7).

5. An in-situ electrochemical testing apparatus for lithium-ion batteries according to claim 1, wherein: the top cover (3) on observation port (30) side is provided with rotatory notch (31), and appurtenance embedding rotatory notch (31) rotates top cover (3).