CN209786099U

CN209786099U - Battery testing intermediate

Info

Publication number: CN209786099U
Application number: CN201920671156.0U
Authority: CN
Inventors: 李致朋; 区定容
Original assignee: Shenzhen Zhiyuan Power Technology Co Ltd
Current assignee: Nanjing Nernst Technology Co ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2019-12-13
Anticipated expiration: 2029-05-10

Abstract

The utility model provides a battery test midbody, this battery test midbody include the different unit subassembly of base plate, first current-collecting layer and a plurality of cross-sectional area. The first current collecting layer is arranged on the surface of the substrate. The unit assemblies are mutually separated and are arranged on the surface of the first current collecting layer, each unit assembly comprises a first electrode layer, an electrolyte layer, a second electrode layer and a second current collecting layer, and the thickness of the unit assemblies is uniform. Through the battery test intermediate, a plurality of battery monomers which are made of the same material and have uniform thickness but different cross sectional areas can be subjected to rapid batch electrochemical performance test, and the influence on the electrochemical performance of the battery monomers caused by the difference of the cross sectional areas can be accurately reflected.

Description

Battery testing intermediate

Technical Field

The utility model relates to a battery technology field, in particular to battery test midbody.

Background

During the production and manufacturing of batteries, different tests of different electrical properties of the batteries, such as resistance and conductivity, are often required. And the resistance and conductivity of the cell are related to its cross-sectional area. Among them, the interface effect, the surface resistance effect, etc. of the battery have more direct correlation effect with the cross-sectional area of the battery. Therefore, it is very important to study the resistance and conductivity corresponding to the batteries with different cross sections.

At present, batteries comprise a positive current collecting layer, a positive electrode, an electrolyte, a negative electrode, a negative current collecting layer and other multilayer structures, so that the batteries are difficult to prepare one by one and have consistent materials and thicknesses, but the batteries with different sizes are used for conducting conductivity tests and interface effect researches, and the testing process is time-consuming and tedious. The accuracy of the test is difficult to guarantee due to the difference of materials and thicknesses among the existing battery monomers.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a battery test midbody aims at solving above-mentioned technical problem.

in order to achieve the above object, the present invention provides a battery test intermediate, the battery test intermediate includes a base plate, a first current collector layer and a plurality of unit modules with different cross-sectional areas. The first current collecting layer is arranged on the surface of the substrate. The unit assemblies are mutually separated and are arranged on the surface of the first current collecting layer, each unit assembly comprises a first electrode layer, an electrolyte layer, a second electrode layer and a second current collecting layer, and the thickness of the unit assemblies is uniform.

In one embodiment, the battery test intermediate further comprises a plurality of cell assemblies having the same cross-sectional area.

In one embodiment, the first current collecting layer has a plurality of central points with the same transverse spacing and/or longitudinal spacing, and a plurality of unit assemblies are respectively and correspondingly located at the central points.

in one embodiment, the distance between one row of unit assemblies close to the edge of the first current collecting layer and the edge of the first current collecting layer is larger than 0.

In one embodiment, the distance between a row of unit assemblies close to the edge of the first current collecting layer and the edge of the first current collecting layer is in a range of 0.1-10 mm.

In one embodiment, the cell assembly is square in cross-section.

In one embodiment, the cross-sectional area of the unit cell is in the range of 0.5 × 0.5-300 × 300 μm²。

In one embodiment, the cross-sectional area of the unit assembly ranges from 10 × 10 to 100 × 100 μm²。

In one embodiment, the thickness of the unit assembly ranges from 10 μm to 200 μm, wherein the thickness of the first current collecting layer ranges from 0.5 μm to 10 μm, and the thickness of the electrolyte layer ranges from 0.05 μm to 0.5 μm.

In one embodiment, the unit assembly and the first current collecting layer together form a battery cell, and the battery cell comprises any one of an all-solid-state thin-film fuel cell and an all-solid-state thin-film lithium battery.

The utility model provides a battery test midbody, it includes the different unit cell assembly of base plate, first current collecting layer and a plurality of cross-sectional area, and a plurality of unit cell assembly alternate segregation just all locate the surface on first current collecting layer, so, the first current collecting layer of a plurality of unit cell assembly sharing to it is the same, the thickness homogeneous to constitute a plurality of materials, but the battery monomer of cross-sectional area difference. Through the battery test intermediate, a plurality of battery monomers which are made of the same material and have uniform thickness but different cross sectional areas can be subjected to rapid batch electrochemical performance test, and the influence on the electrochemical performance of the battery monomers caused by the difference of the cross sectional areas can be accurately reflected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a battery test intermediate provided by the present invention;

FIG. 2 is a top view of the test intermediate of the cell of FIG. 1;

FIG. 3 is a schematic illustration of the connection of the test intermediate to the electrode of the cell of FIG. 1;

Fig. 4 is a process diagram illustrating an embodiment of a method for preparing a battery test intermediate according to the present invention.

The reference numbers illustrate:

Reference numerals	Name (R)	Reference numerals	Name (R)
				1	Battery testing intermediate	10	Substrate
20	First current collecting layer	30	Unit assembly
				31	A first electrode layer	32	Electrolyte layer
33	A second electrode layer	34	Second current collector layer

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a battery test midbody 1, please refer to fig. 1 and fig. 2 and show, in the utility model discloses an embodiment, battery test midbody 1 includes base plate 10, first current collecting layer 20 and a plurality of different unit block 30 of cross-sectional area, in this embodiment, base plate 10 adopts the silicon substrate. The first current collector layer 20 is provided on the surface of the substrate 10. The plurality of unit assemblies 30 are spaced apart from each other and are disposed on the surface of the first current collecting layer 20, each unit assembly 30 includes a first electrode layer 31, an electrolyte layer 32, a second electrode layer 33, and a second current collecting layer 34, and the plurality of unit assemblies 30 have a uniform thickness. In this way, the plurality of unit modules 30 share the first current collector layer 20, and constitute a plurality of unit cells having the same material, uniform thickness, and different cross-sectional areas. It is understood that the plurality of unit modules 30 have a uniform thickness, which means that the thicknesses of the respective layers in all the unit modules 30 are substantially the same, and the thicknesses of the respective layers in the different unit modules 30 are allowed to be within ± 0.5% without affecting the battery performance. Of course, the thickness of the different battery material layers may be different for the same cell assembly 30, and in general, the thickness of both the current collector layer and the electrode layer is greater than the thickness of the electrolyte layer.

it is understood that during the production and manufacture of batteries, it is often necessary to perform electrochemical performance tests on the positive electrode material, the negative electrode material, the electrolyte material, and the full battery. Taking the test of conductivity as an example, the following is the formula for conductivity:

Where σ represents conductivity, U represents voltage, I represents current, L represents length of the conductor under test, and a represents cross-sectional area of the conductor under test.

From the above formula it can be seen that the conductivity of different cell materials or cell components, even the whole full cell, is related to the corresponding cross-sectional area a. The interface effect, the surface resistance effect and the like of the battery have direct correlation effects with the cross-sectional area of the battery. Therefore, it is essential to study the resistance and conductivity of the cells with different cross-sectional areas. However, at present, because the battery comprises a multilayer structure such as a positive current collecting layer, a positive electrode, an electrolyte, a negative electrode charge negative current collecting layer and the like, especially for micro-scale or even nano-scale micro-batteries and thin film batteries, it is difficult to simultaneously prepare a plurality of batteries with consistent materials and thicknesses, only batteries with different cross-sectional areas are used for testing the conductivity, and the testing process is time-consuming and tedious. In addition, due to the difference of materials and thicknesses between the existing battery cells, the accuracy of the test is difficult to guarantee.

therefore, the utility model provides a battery test midbody, this battery test midbody include the different unit cell assembly of base plate, first current collector layer and a plurality of cross-sectional area, and a plurality of unit cell assembly alternate segregation just all locate the surface on first current collector layer, so, the first current collector layer of a plurality of unit cell assembly sharing to it is the same, the thickness homogeneous to constitute a plurality of materials, but the battery monomer that the cross-sectional area is different. Through the battery test intermediate, a plurality of battery monomers which are made of the same material and have uniform thickness but different cross sectional areas can be subjected to rapid batch electrochemical performance test, and the influence on the electrochemical performance of the battery monomers caused by the difference of the cross sectional areas can be accurately reflected.

Further, as shown in fig. 2, the battery test intermediate 1 further includes a plurality of unit modules 30 having the same cross-sectional area. It is understood that the battery test intermediate 1 includes a plurality of unit assemblies 30 having the same cross-sectional area in addition to a plurality of unit assemblies 30 having different cross-sectional areas, so that the unit assemblies 30 having the same cross-sectional area can be repeatedly tested to improve the accuracy of the test results.

Further, as shown in fig. 2, the first current collector 20 has a plurality of center points with the same transverse spacing and/or longitudinal spacing, the plurality of unit modules 30 are arranged in an array with a plurality of rows and columns, and the plurality of unit modules 30 are respectively located at the center points. It can be understood that for the battery monomer of micron level, at the testing process, need look for the battery monomer that awaits measuring with the help of optical microscope, carry out orderly arrangement with unit component 30, unit component 30 corresponds respectively and is located the central point, can conveniently fix a position the battery monomer that awaits measuring fast, improves the efficiency of batched test greatly.

In one embodiment, as shown in fig. 1, a row of unit modules 30 near the edge of the first current collector layer 20 is spaced from the edge of the first current collector layer 20 by a distance d₀Greater than 0. Preferably, a row of unit assemblies 30 near the edge of the first current collector layer 20 is spaced from the edge of the first current collector layer 20 by a distance d₀the range of (1) is 0.1 to 10 mm. It is understood that, since all the unit assemblies 30 share the first current collector layer 20, each unit assembly 30 and the first current collector layer 20 constitute a battery cell. In the process of the conductivity test, as shown in fig. 3, only one of the test electrodes needs to be electrically connected to the first current collector, so that the test electrode is electrically connected to all the battery cells, and then the other test electrode is electrically connected to the second current collecting layer 34 of any one of the battery cells, so that the battery cell can be tested. In the present embodiment, in order to facilitate the test electrode to establish electrical connection with the first current collecting layer 20, one edge portion of the first current collecting layer 20 does not cover the cell assembly 30, and exposes a portion of the surface to be electrically connected with the test electrode.

In one embodiment, the cell assembly 30 is square in cross-section, as shown in FIG. 2. The cross section of the unit assembly 30 is designed to be square, on one hand, the square area is considered to be easy to calculate, so that the testing efficiency can be improved, and the testing data can be conveniently arranged; on the other hand, the square unit assembly 30 is easy to manufacture and convenient to manufacture in batch. Of course, in other embodiments, the cross-sectional shape of the cell assembly 30 may be circular, triangular, rectangular, etc.

In one embodiment, the cross-sectional area of the unit assembly 30 ranges from 0.5 × 0.5 to 300 × 300 μm². Preferably, the cross-sectional area of the unit assembly 30 ranges from 10 × 10 to 100 × 100 μm². As shown in fig. 2, the battery test intermediate 1 includes cell assemblies 30A, B, C, D of 4 different cross-sectional areas, and the cross-sectional areas of four cell assemblies 30 are as follows: s_A＝80×80μm²，S_B＝40×40μm²，S_C＝20×20μm²，S_D＝10×10μm². Specifically, the four unit assemblies 30 are arranged in such a mannerIn the multi-row and multi-column array, the area of the unit cell 30 in each row is different, and the area of the unit cell 30 in each column is also different. It is noted that one unit cell assembly 30 is absent from each of the rows and columns near the edge of the test intermediate. This is because the unit assembly 30 has an area size of micrometer, the unit assembly 30 to be tested needs to be identified by an optical microscope during the test, and a row and a column on the edge of the unit assembly 30 are not occupied, so that different rows and columns can be distinguished conveniently, and the condition of missing test or retest can be avoided.

In one embodiment, the total thickness d of the cell assembly 30₁In the range of 10 to 200 μm, the thickness d of the first current collecting layer 20₂The range of (A) is 0.5 to 10 μm, and the thickness of the electrolyte layer 32 is 0.05 to 0.5 μm. On the premise of satisfying the function of the electrolyte layer 32, the thinner the electrolyte layer 32 is, the better the electrolyte layer 32 is, the shorter the path through which ions need to shuttle is, and the more favorable the battery performance is.

Further, the battery cell includes any one of an all-solid-state thin film fuel cell and an all-solid-state thin film lithium battery. Taking the battery cell as an all-solid-state thin-film lithium battery as an example, the first electrode layer 31 is a positive electrode, and lithium cobaltate (LiCoO) is used₃) As a positive electrode material; the first current collecting layer 20 is a positive current collecting layer and is made of a metal copper material; the second electrode layer 33 is a negative electrode and is made of lithium titanate (LiTiO)_x) As a negative electrode material, the second current collecting layer 34 is a negative electrode current collecting layer and is made of a metal aluminum material; the electrolyte layer 32 is made of solid LiLaTaO₃. It should be noted that the battery test intermediate 1 is suitable for testing the electrochemical performance of various batteries, and the present invention does not limit the kind of the battery.

The following will explain the preparation method of the battery test intermediate 1 provided in the embodiment of the present invention.

Referring to fig. 4, the preparation method of the battery test intermediate 1 includes the following steps:

S1, controlling a film deposition device to sequentially deposit a first current collecting layer 20, a first electrode layer 31, an electrolyte layer 32, a second electrode layer 33 and a second current collecting layer 34 which are uniform in thickness on a substrate 10;

S2, controlling a mold cover to cover the surface of the second flow collecting layer 34, wherein the mold cover comprises a plurality of mold plates which are arranged at intervals and have different areas;

And S3, controlling an ion beam etching device to sequentially etch the second current collecting layer 34, the second electrode layer 33, the electrolyte layer 32 and the first electrode layer 31 along the longitudinal direction of the template interval region so as to expose the first current collecting layer 20 corresponding to the interval region.

in step S1, different thin film deposition methods, including sputter deposition, laser pulse deposition, evaporation deposition, chemical vapor deposition, and molecular beam epitaxy, may be used according to the nature of the battery material to be deposited. In this embodiment, the substrate 10 is a silicon substrate 10.

In step S3, since the mask is disposed on the surface of the second current collecting layer 34, and the plurality of templates in the mask are disposed at intervals, the ion beam can only etch the interval regions between the templates, and the region of each layer of battery material layer that is blocked by the template remains. It should be noted that the etching depth of the ion beam only reaches the surface of the first current collecting layer 20, so that the first current collecting layer 20 corresponding to the spacing region is exposed, and a plurality of battery cells separated from each other are formed, and the plurality of battery cells share the first current collecting layer 20.

Further, the step S3 includes the following steps:

Controlling the etching depth of the ion beam etching device to be d₃Wherein d is₁≤d₃＜d₁+d₂。

It can be understood that the etching depth d of the ion beam₃must be greater than or equal to d₁so as to expose the first current collecting layer 20 corresponding to the spacing region and separate the single batteries, thereby avoiding short circuit; in addition, the etching depth d₃May be greater than d₁But must be less than d₁+d₂Since the surface of the first current collector layer 20 is partially etched without affecting the test, it is only necessary that the first current collector layer 20 does not have a fault.

it is understood that the battery test intermediate 1 provided in the above-described example was prepared by controlling the shape, size and arrangement of the template. The specific control method is not described in detail herein.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A battery test intermediate, comprising:

a substrate;

The first current collecting layer is arranged on the surface of the substrate;

the unit assemblies are mutually separated and arranged on the surface of the first current collecting layer, each unit assembly comprises a first electrode layer, an electrolyte layer, a second electrode layer and a second current collecting layer, and the thickness of the unit assemblies is uniform.

2. The battery test intermediate of claim 1, further comprising a plurality of cell assemblies of equal cross-sectional area.

3. The battery test intermediate of claim 2, wherein the first current collector layer has a plurality of center points with the same lateral and/or longitudinal spacing, and a plurality of the unit modules are respectively located at the center points.

4. The battery test intermediate of claim 3, wherein a row of cell modules near an edge of the first current collector layer is spaced from the edge of the first current collector layer by a distance greater than 0.

5. The battery test intermediate of claim 4, wherein a row of cell modules near the edge of the first current collector layer is spaced from the edge of the first current collector layer by a distance in the range of 0.1 mm to 10 mm.

6. The battery test intermediate of claim 5, wherein the cell assembly is square in cross-section.

7. The battery test intermediate of claim 6, wherein the cell assembly has a cross-sectional area in the range of 0.5 x 0.5 to 300 x 300 μm²。

8. The battery test intermediate of claim 7, wherein the cell assembly has a cross-sectional area ranging from 10 x 10 to 100 x 100 μm²。

9. The battery test intermediate of claim 8, wherein the cell assembly has a thickness in a range of 10 to 200 μm, wherein the first current collecting layer has a thickness in a range of 0.5 to 10 μm, and the electrolyte layer has a thickness in a range of 0.05 to 0.5 μm.

10. The battery test intermediate as claimed in any one of claims 1 to 9, wherein the unit cell and the first current collecting layer together constitute a cell unit including any one of an all-solid thin film fuel cell and an all-solid thin film lithium battery.