CN219086037U - Battery structure for raman test - Google Patents

Abstract

The utility model relates to a battery test technical field to a battery structure for carrying out Raman test, including first end plate and second end plate, and press from both sides the sealing washer of establishing between first end plate and second end plate, first end plate, second end plate and sealing washer enclose and close and form the cavity, be equipped with layered structure in the cavity and be used for infiltrating layered structure's electrolyte, layered structure includes the diaphragm and pastes first electrode and the second electrode of establishing in the diaphragm both sides, wherein, first electrode is including pasting the first electrode active material layer of establishing at the diaphragm surface, and paste the first mass flow body of establishing at first electrode active material layer and keeping away from diaphragm one side surface, at least one first through-hole has been seted up to first mass flow body surface, first through-hole and first electrode active material layer surface intercommunication, first mass flow body and first end plate face to face setting, first end plate is the printing opacity setting. The battery for carrying out Raman test is simple and reasonable in structure and easy to assemble.

Description

Battery structure for raman test

Technical Field

The application belongs to the technical field of battery testing, and particularly relates to a battery structure for carrying out Raman testing.

Background

With the rapid development of lithium ion batteries, researches on the energy storage mechanism of lithium ion batteries have also received important attention from researchers. How to characterize the products of the cycling process of lithium ion batteries has become an important issue. The use of raman spectroscopy to test electrode materials is an important means to study the energy storage mechanism of lithium ion batteries. The raman spectrum is a scattering phenomenon in which a substance molecule largely changes the frequency of incident light, and by collecting a scattering spectrum different from the frequency of incident light, structural information corresponding to the irradiated substance molecule can be obtained by back-pushing. At different electrode potentials, the raman spectrum signal generated by excitation of the electrode surface by monochromatic incident light is different. Meanwhile, the sensitivity of the Raman spectrum is very high, and the electrode material can be rapidly tested under unsteady state.

In the prior art, the common Raman testing device for the battery mainly comprises a flange structure and a button structure, wherein the flange testing structure has good sealing performance, but has complex structural design and high manufacturing cost, and meanwhile, the main body of the metal material is easy to influence unpredictable chemical reaction with the battery material to influence the testing result; the button type test structure adopts the quartz plate structure to contact with the electrode, has small influence on electrochemical reaction, has a relatively simple and compact structure, but has small size, needs to be embedded into the electrode cover, and is difficult to assemble.

For the above related art, how to design a raman test structure that is easier to assemble is a technical problem that needs to be solved at present.

Disclosure of Invention

An object of the embodiment of the application is to provide a battery structure for carrying out raman test, so as to solve the problems that the battery structure for raman test is complex and difficult to assemble.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows: the utility model provides a battery structure for carrying out Raman test, including first end plate and second end plate, and press from both sides the sealing washer of establishing between first end plate and second end plate, first end plate, second end plate and sealed enclose and close the constitution cavity structure, be equipped with the layer structure in the cavity and be used for infiltration layer structure's electrolyte, layer structure includes the diaphragm and pastes first electrode and the second electrode of establishing in the diaphragm both sides, wherein first electrode is including pasting the first electrode active material layer of establishing at the diaphragm surface, and paste the first electric current collector of establishing at first electrode active material layer and keeping away from diaphragm one side surface, at least one first through-hole has been seted up to first electric current collector surface, first through-hole and first electrode active material layer surface intercommunication, first electric current collector and first end plate face-to-face setting, first end plate printing opacity sets up.

In some embodiments, a side of the first current collector remote from the first electrode active material layer is in close proximity to a surface of the first end plate.

In some embodiments, the second electrode includes a second electrode active material layer attached to a surface of the separator, and a second current collector attached to a surface of the second electrode active material layer, which is far away from the separator, and at least one second through hole is formed in a surface of the second current collector, the second through hole is communicated with a surface of the second electrode active material layer, the second current collector is arranged face to face with the second end plate, and the second end plate is arranged in a light-transmitting manner.

In the above embodiment, both end plates may be configured as a light-transmitting structure, so that raman tests may be performed on both electrodes respectively without replacing the battery structure, providing more referent data for battery tests.

In some embodiments, a side of the second current collector remote from the second electrode active material layer abuts a surface of the second end plate.

In some embodiments, the first electrode extends at least partially through the seal ring and out of the cavity, and the second electrode extends at least partially through the seal ring and out of the cavity.

In some embodiments, the sealing ring structure for connection and sealing can be made of a material with a flow curing effect, and the sealing ring is formed by filling between the first end plate and the second end plate, and can also be directly assembled and connected by adopting a prefabricated structure, so that the production and the quick installation are easy.

In some embodiments, the first electrode includes a first tab penetrating through the sealing ring, one end of the first tab is electrically connected to the first current collector, and the other end of the first tab extends out of the cavity.

In some embodiments, the second tab includes a second tab disposed through the seal ring, one end of the second tab being electrically connected to the second current collector, and the other end of the second tab extending outside the cavity.

In some embodiments, the first current collector has a thickness of 20 μm to 30 μm.

In some embodiments, the first electrode active material layer has a thickness of 200 μm to 500 μm.

In some embodiments, the second electrode active material layer has a thickness of 200 μm to 500 μm.

In some embodiments, the thickness of the second current collector is 5 μm to 15 μm.

In some embodiments, the material of the second end plate is transparent quartz glass.

In some embodiments, the material of the first end plate is transparent quartz glass.

In summary, the present application at least includes one of the following beneficial technical effects:

in order to solve the technical problems that the structure of the Raman test battery is complex and difficult to assemble at the present stage, the utility model provides a novel structural design, two end plates are adopted to replace an electrode cover and a transparent window structure, one end plate is arranged in a light-transmitting way, so that a light-permeable window is provided for Raman test.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an isometric view of a battery structure for performing raman testing according to one embodiment of the present application.

Fig. 2 is an exploded view of a battery structure for performing raman testing according to one embodiment of the present application.

Fig. 3 is a side cross-sectional view of a battery structure for performing raman testing according to one embodiment of the present application.

Fig. 4 is a raman test spectrum of the battery structure provided in example 2 of the present application.

Wherein, each reference sign in the figure:

1. a first end plate; 2. a second end plate; 3. a seal ring; 4. a layered structure; 5. an electrolyte;

41. a diaphragm; 42. a first electrode; 43. a second electrode; 421. a first electrode active material layer;

422. a first current collector; 4221. a first through hole; 431. a second electrode active material layer;

432. a second current collector; 4321. a second through hole; 423. a first tab; 433. and a second lug.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below 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 present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1-3, a battery structure for performing raman test according to an embodiment of the present application will now be described.

Referring to fig. 1 and 3, the battery structure for raman test includes a first end plate 1, a second end plate 2, a sealing ring 3, a layered structure 4 and an electrolyte 5, where the first end plate 1 and the second end plate 2 are oppositely disposed, the sealing ring 3 is sandwiched between the first end plate 1 and the second end plate 2 to form a cavity structure, the layered structure 4 and the electrolyte 5 are both disposed inside the cavity structure, specifically, the layered structure 4 includes a membrane 41, a first electrode 42 and a second electrode 43, the first electrode 42 and the second electrode 43 are disposed on two side surfaces of the membrane 41, the electrolyte 5 infiltrates on the surfaces of the membrane 41, the first electrode 42 and the second electrode 43, the first electrode 42 includes a first electrode active material layer 421 and a first current collector 422, the first electrode active material layer 421 is attached to a surface of the first electrode active material layer 421 far away from the membrane, a first through hole 4221 is formed on a surface of the first current collector 422, the first through hole 4221 is in communication with the surface of the first electrode active material layer 421, and the first electrode 422 is disposed opposite to the first end plate 1.

In the above embodiment, the connection parts of the sealing ring 3 and the first end plate 1 and the second end plate 2 are all in sealing connection, so that the cavity structure is relatively airtight, meanwhile, the sealing ring 3 can also play a role of a connecting piece for connecting the first end plate 1 and the second end plate 2, compared with the flange plate structure in the prior art, the structure of the above embodiment is simpler, the first end plate 1 can directly replace an electrode cover structure, so that a structure of opening holes on the surface of the electrode cover and embedding observation windows is omitted, the first end plate 1 adopts a light-transmitting arrangement, an optical path can be directly provided for raman test, the surface of the first current collector 422 is provided with a first through hole 4221 as a test window, and as the first current collector 422 and the first end plate 1 are arranged face to face, a light source for raman test can be transmitted to the surface of the first electrode active material layer 421 through the first end plate 1, so as to fulfill the aim of raman test; the first current collector 422 may isolate the first electrode active material layer 421 from direct contact with the first end plate 1.

In some embodiments, the sealing ring 3 is formed by curing a rapidly curable material, by sandwiching the layered structure 4 between the first end plate 1 and the second end plate 2, and then filling the material forming the sealing ring 3 between the first end plate 1 and the second end plate 2, while the filling position is located at the periphery of the layered structure 4, and after the material is cured, the sealing ring 3 is formed, and in an example, the sealing ring 3 may be formed by using epoxy resin to gel.

In the above embodiment, the structure of the seal ring 3 enables it to be manufactured and assembled more quickly in the battery structure of the present application, which is advantageous in reducing the difficulty of assembly.

In some embodiments, the water oxygen content in the cavity formed by the first end plate 1, the second end plate 2 and the sealing ring 3 is less than 0.1ppm.

In some embodiments, the sealing ring 3 may also adopt a prefabricated structure, and a stacked layered structure is formed among the first end plate 1, the sealing ring 3 and the second end plate 2, and the structure is easy to assemble and connect, and in the example, the first end plate 1 and the sealing ring 3 and the second end plate 2 and the sealing ring 3 may be fixed by adopting bonding.

In some embodiments, a side of the first current collector 422 remote from the first electrode active material layer 421 is abutted against a surface of the first terminal plate 1.

In the above embodiment, when the first current collector 422 is close to the first end plate 1, the distance between the two is smaller, the optical path length of the raman test optical path is relatively shorter, and the interference factor in the corresponding optical path is reduced, which is beneficial to improving the accuracy of the detection result.

In some embodiments, the second electrode 43 includes a second electrode active material layer 431 adhered to a surface of the separator 41, and a second current collector 432 adhered to a surface of the second electrode active material layer 431 away from the separator 41, at least one second through hole 4321 is formed on a surface of the second current collector 432, the second through hole 4321 is in surface communication with the second electrode active material layer 431, the second current collector 432 is disposed face to face with the second end plate 2, and the second end plate 2 is disposed in a light-transmitting manner.

In the above embodiment, the second end plate 2 is kept transparent on the basis of the first end plate 1 transparent, so that the corresponding battery structure can perform raman test on both the first electrode 42 and the second electrode 43 at the same time, specifically, in order to perform raman test on the second electrode active material layer 431, the surface of the second current collector 432 attached to the surface of the second electrode active material layer 431 is provided with the second through hole 4321, and the second electrode active material layer 431 located below the second current collector 432 can be directly observed through the second through hole 4321.

The second end plate 2 can also replace the structure of opening a hole on the surface of the electrode cover to set an observation window in the conventional structure, so that the assembly step is simplified, and the structure is simpler; the second current collector 432 may also prevent the second electrode active material layer 431 from directly contacting the second end plate 2, improving accuracy of raman test results.

In some embodiments, a side of the second current collector 432 remote from the second electrode active material layer 431 is abutted against a surface of the second end plate 2.

In the above embodiment, the same structure as that of the first current collector 422 and the first end plate 1, by shortening the distance between them, the raman test optical path can be effectively shortened, thereby reducing the infective element in the pipeline and improving the accuracy of the raman test.

In some embodiments, the first electrode 42 extends at least partially through the seal ring 3 and out of the chamber, and the second electrode 43 extends at least partially through the seal ring 3 and out of the chamber. The first electrode 42 and the second electrode 43 can be led out from the outer side surface of the sealing ring 3 in a mode of partially penetrating the sealing ring 3, so that the battery can be charged and discharged conveniently, in-situ raman test can be realized, and corresponding through holes can be formed in the surface of the sealing ring 3 to match with the penetrating operation. In some embodiments, when the sealing ring 3 is made by curing and molding the curable material, the first electrode 42 and the second electrode 43 may be directly led out in advance, and then the material of the sealing ring 3 is filled between the first end plate 1 and the second end plate 2, and the structure portion led out in advance of the first electrode 42 and the second electrode 43 is cured so as to form an exposed electrode.

In some embodiments, the first electrode 42 includes a first tab 423 penetrating the sealing ring 3, one end of the first tab 423 is electrically connected to the first current collector 422, and the other end of the first tab 423 extends out of the cavity.

In the above embodiment, the separate first tab 423 is connected to the inner and outer sides of the sealing ring 3, so that the first tab 423 can be made of a material with higher strength and a more reasonable material size can be selected compared with the direct first electrode 42.

In some embodiments, the second electrode 43 includes a second tab 433 penetrating the sealing ring 3, one end of the second tab 433 is electrically connected to the second current collector 432, and the other end of the second tab 433 extends out of the cavity.

In the above embodiment, similar to the effect of the first tab 423, the second tab 433 can improve the connection strength between the second electrode 43 and the circuit structure outside the sealing ring 3, and by adopting the single second tab 433, the single material selection and the size selection can be performed to adapt to the structural strength requirements in the installation process and the test process.

In the above embodiment, the first tab 423 and the second tab 433 may be embedded in the sealing ring 3 in advance, and the first tab 423 and the second tab 433 may be electrically connected to the corresponding first current collector 422 and the second current collector 432 by welding or direct lap joint.

In some embodiments, the thickness of the first current collector 422 is 20 μm-30 μm.

In some embodiments, the first electrode active material layer 421 has a thickness of 200 μm to 500 μm.

In some embodiments, the thickness of the membrane 41 is 10 μm to 30 μm.

In some embodiments, the thickness of the second electrode active material layer 431 is 200 μm to 500 μm.

In some embodiments, the thickness of the second current collector 432 is 5 μm-15 μm.

In some embodiments, the material of the second end plate 2 is transparent quartz glass.

In some embodiments, the material of the first end plate 1 is transparent quartz glass.

In the above embodiment, in order to further ensure the accuracy of raman detection, transparent quartz glass is adopted to improve the light transmittance on the one hand, and has small interference, and on the other hand, the quartz glass has good chemical inertness and does not participate in the electrochemical reaction of the electrode material of the battery basically. The side reaction influence is avoided, the detection accuracy is improved, meanwhile, the transparent quartz glass material is easy to obtain, the cost is low, and the popularization and application of the battery structure are facilitated.

In the above embodiment, the first electrode 42 and the second electrode 43 may be positive and negative electrodes, respectively, and the first tab 423 and the second tab 433 may be aluminum tab, nickel tab, copper tab or aluminum alloy tab, nickel alloy tab, copper alloy tab, respectively; the first current collector 422 and the second current collector 432 may be respectively selected from aluminum foil, copper foil, or aluminum alloy foil, copper alloy foil.

To demonstrate that the raman tested battery structure of the present utility model has good test results, the following two sets of examples are now used for raman testing:

example 1

Lithium ion full battery:

in a glove box with water oxygen content less than 0.1ppm, filling nitrogen in the glove box, coating a positive electrode active material on the surface of a perforated positive electrode current collector aluminum foil, coating a negative electrode active material on the surface of a perforated negative electrode current collector copper foil, perforating the surface of the positive electrode current collector aluminum foil to face the positive electrode active material, stacking a first transparent quartz glass, a positive electrode current collector, a positive electrode active material layer, a diaphragm, a negative electrode active material layer, a negative electrode current collector and a second transparent quartz glass from top to bottom, soaking electrolyte on a stacked structure, welding a positive electrode lug on the side surface of the positive electrode current collector, welding a negative electrode lug on the side surface of the negative electrode current collector, fixing the stacked structure by using a clamp, coating epoxy resin glue between the first transparent quartz glass and the second transparent quartz glass at the same time outside the stacked electrode structure, keeping the positive electrode lug and the negative electrode lug exposed, and taking out from the glove box after solidification. Because the upper side and the lower side are both suitable for glass observation windows, in-situ Raman spectrum measurement is carried out on the positive electrode active material and the negative electrode active material.

Example 2

Lithium ion half-cell:

in a glove box with water oxygen content less than 0.1ppm, filling nitrogen in the glove box, coating a positive electrode active material on the surface of a perforated positive electrode current collector aluminum foil, perforating the surface of the positive electrode current collector aluminum foil to face the positive electrode active material, stacking transparent quartz glass, a positive electrode current collector, a positive electrode active material layer (graphene oxide), a diaphragm, a metal lithium sheet and second quartz glass from top to bottom, soaking electrolyte on a stacking structure, welding a positive electrode tab on the side surface of the positive electrode current collector, welding a negative electrode tab on the side surface of the metal lithium sheet, fixing the stacked structure by using a clamp, coating epoxy resin glue between the first transparent quartz glass and the second quartz glass on the outer side of the stacked electrode structure, keeping the positive electrode tab and the negative electrode tab exposed, and taking out from the glove box after solidification. The positive electrode active material was subjected to in-situ raman spectroscopy measurement through transparent quartz glass on the positive electrode side, and the measurement spectrum is shown in fig. 4.

As shown in fig. 4, it can be seen that the data obtained by the test performed by the half-cell raman test device assembled using graphene oxide as an electrode material. Two Raman spectrum characteristic peaks of graphene oxide are respectively located at 1350cm ^-1 And 1580cm ^-1 The D peak and the G peak are respectively called, wherein the D peak is a defect peak representing sp3 hybridization, the relative intensity reflects the disturbance degree of a crystal structure, and the G peak is used for representing the sp2 bond structure of carbon 2 and represents a first-order scattering E2G vibration mode. During discharging, the D peak of the graphene oxide moves to a high wave number, which indicates that the defect structure in the material has a process of adsorbing electrolyte ions, and after charging, the D peak of the graphene returns to a low wave number, which indicates that the defect structure in the material has a desorption process for the electrolyte ions. The test result shows that the lithium storage mechanism of the pseudocapacitance of the reversible physical adsorption and desorption of the half-cell with the graphene as the electrode material in the charge and discharge processes. The result shows that the electrochemical in-situ Raman test device can be applied to the research of lithium energy storage mechanism of a lithium ion battery.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims (10)

1. The utility model provides a battery structure for carrying out Raman test, its characterized in that includes first end plate and second end plate to and the clamp establishes the sealing washer between first end plate and second end plate, first end plate the second end plate with the sealing washer encloses and closes and form the cavity, be equipped with the layer structure in the cavity and be used for infiltration layer structure's electrolyte, the layer structure includes the diaphragm and pastes first electrode and the second electrode of establishing in the diaphragm both sides, wherein, first electrode is including pasting the first electrode active material layer of establishing at the diaphragm surface, with paste and establish the first current collector of first electrode active material layer one side surface of keeping away from the diaphragm, first current collector surface has seted up at least one first through-hole, first through-hole with first electrode active material layer surface intercommunication, first current collector with first end plate face sets up, first end plate is the printing opacity setting.

2. The battery structure for performing raman testing according to claim 1, wherein: the side of the first current collector, which is away from the first electrode active material layer, is abutted against the surface of the first end plate.

3. The battery structure for performing raman testing according to claim 1, wherein: the first electrode at least partially penetrates through the sealing ring and extends out of the cavity, and the second electrode at least partially penetrates through the sealing ring and extends out of the cavity.

4. A battery structure for performing raman testing according to claim 3 wherein: the first electrode comprises a first tab penetrating through the sealing ring, one end of the first tab is electrically connected with the first current collector, and the other end of the first tab extends out of the cavity.

5. A battery structure for performing raman testing according to claim 3 wherein: the second electrode comprises a second electrode active material layer attached to the surface of the diaphragm, and a second current collector attached to the surface of one side of the second electrode active material layer, which is far away from the diaphragm, wherein at least one second through hole is formed in the surface of the second current collector, the second through hole is communicated with the surface of the second electrode active material layer, the second current collector and the second end plate are arranged face to face, and the second end plate is arranged in a light-transmitting mode.

6. The battery structure for performing raman testing according to claim 5, wherein: one surface of the second current collector, which is far away from the second electrode active material layer, is closely attached to the surface of the second end plate.

7. The battery structure for performing raman testing according to claim 5, wherein: the second electrode comprises a second lug penetrating through the sealing ring, one end of the second lug is electrically connected with the second current collector, and the other end of the second lug extends out of the cavity.

8. The battery structure for performing raman testing according to claim 5, wherein: the first current collector has a thickness of 20 μm to 30 μm, and/or the first electrode active material layer has a thickness of 200 μm to 500 μm, and/or the separator has a thickness of 10 μm to 30 μm, and/or the second electrode active material layer has a thickness of 200 μm to 500 μm, and/or the second current collector has a thickness of 5 μm to 15 μm.

9. The battery structure for performing raman testing according to claim 5, wherein: the second end plate is made of transparent quartz glass.

10. The battery structure for performing raman testing according to claim 1, wherein: the first end plate is made of transparent quartz glass.

Images