Lithium ion battery in-situ detection device

Abstract

The utility model discloses an in-situ detection device for a lithium ion battery, which relates to the technical field of lithium battery testing and comprises an electrode upper cover, an insulator circular ring, an insulator lower cover, a transparent window upper cover, a transparent window side cover, a sealing ring, an electrode conductive gasket, a connecting bolt, an electrode support connecting bolt and an electrode conductive support. The surface of a tested electrode material is observed through the transparent window upper cover, the reaction condition of the cross section of the tested electrode material is observed through the transparent window side cover, the change conditions of the surface and the cross section of a pole piece are visually measured at the same time, the position of an observation area can be adjusted, and the reaction process of the pole piece is researched in a targeted mode. Meanwhile, the appearance and the volume change condition of the pole piece can be marked through the scales on the transparent window side cover, the mechanism of the reaction process of the battery pole piece is deeply and comprehensively researched, the reaction mechanism of the battery is deeply researched, and a new tool is provided for providing a corresponding improvement strategy.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery testing, in particular to an in-situ detection device for a lithium ion battery. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, high energy efficiency, long cycle life, no memory effect, and fast discharge. Therefore, there is a huge market demand in the fields of consumer electronics and electric vehicles, grid peak regulation, energy storage power supplies, aerospace, etc. In order to cope with the performance, cost and environmental challenges currently faced by lithium-ion batteries, the development of electrode materials with abundant reserves, low cost and easy access, and excellent electrochemical properties is the current research and development direction. At present, people still have unclear understanding of the reaction principles of lithium-ion batteries, such as the formation mechanism of SEI films of different electrode materials, the volume expansion process of electrode materials during charging and discharging, etc., which affects the further development of lithium-ion batteries. The main reason for these limitations is that the existing characterization methods are difficult to intuitively measure the changes on the surface and cross-section of the electrode at the same time. Utility Model Content

[0003] In response to the problems existing in the prior art, the utility model conceives an in-situ detection device for lithium-ion batteries, which can simultaneously test the reaction conditions of the surface and cross-section of electrode materials, providing a new tool for more in-depth research on battery reaction mechanisms and proposing corresponding improvement strategies.

[0004] The technical solution adopted in the present invention is: a lithium-ion battery in-situ detection device, characterized in that it includes: an electrode upper cover 1, an insulator ring 2, an insulator lower cover 3, a transparent window upper cover 4, a transparent window side cover 5, a connecting bolt 15, an electrode support connecting bolt 16 and an electrode conductive support 17, an electrode upper cover window is provided on the electrode upper cover 1, the electrode upper cover window is sealed and connected to the transparent window upper cover 4, an insulator outer ring side window is provided on the insulator ring 2, the insulator outer ring side window is connected to the transparent window The side cover 5 is sealed and connected, a scale line 14 is set on the transparent window side cover 5, an electrode conductive support 17 is set on the upper surface of the insulator lower cover 3, the insulator lower cover 3 and the electrode conductive support 17 are connected by electrode support connecting bolts 16, the insulator ring 2 is cooperatively connected with the electrode conductive support 17, an electrode upper cover 1 is set on the upper surface of the insulator ring 2, and an insulator lower cover 3 is set on the lower surface of the insulator ring 2, and the electrode upper cover 1, the insulator ring 2 and the insulator lower cover 3 are connected by connecting bolts 15.

[0005] Furthermore, it also includes: a sealing ring 11, which is arranged between the insulator ring 2 and the electrode conductive support 17.

[0006] Furthermore, it also includes: an electrode conductive gasket 12 , which is provided on the upper surface of the electrode conductive support 17 inside the insulator ring 2 .

[0007] Furthermore, the electrode upper cover 1 is provided with a lead-out electrode.

[0008] Furthermore, the insulating ring 2 is made of insulating material.

[0009] Furthermore, the electrode conductive support 17 is height-adjustable.

[0010] The beneficial effects of the lithium-ion battery in-situ detection device of the utility model are embodied in:

[0011] A lithium-ion battery in-situ detection device observes the surface of the electrode material being tested through a transparent window top cover, and observes the reaction of the cross-section of the electrode material being tested through a transparent window side cover. The changes in the surface and cross-section of the electrode are measured intuitively and simultaneously. The position of the observation area can be adjusted to study the reaction process of the electrode in a targeted manner. At the same time, the scale of the transparent window side cover can mark the electrode morphology and volume change, which can be used to more deeply and comprehensively study the mechanism of the battery electrode reaction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional view of an in-situ detection device for lithium-ion batteries;

[0013] Figure 2 It is an exploded view of an in-situ detection device for lithium-ion batteries;

[0014] Figure 3 is a cross-sectional view of an in-situ detection device for a lithium-ion battery;

[0015] Figure 4 yes Figure 3 Middle A: Enlarged view;

[0016] Figure 5 This is a surface image of a lithium-ion battery in its initial state;

[0017] Figure 6 This is a cross-sectional picture of the initial state of a lithium-ion battery;

[0018] Figure 7 This is a surface image of a lithium-ion battery in a fully charged state;

[0019] Figure 8 This is a cross-sectional picture of a fully charged lithium-ion battery;

[0020] Figure 9 It is the charge and discharge curve of lithium-ion battery;

[0021] In the figure: 1. Electrode upper cover, 2. Insulator ring, 3. Insulator lower cover, 4. Transparent window upper cover, 5. Transparent window side cover, 6. Aluminum negative electrode sheet, 7. Diaphragm, 8. Nickel-cobalt-manganese ternary positive electrode sheet, 9. Gasket, 10. Spring clip, 11. Sealing ring, 12. Electrode conductive gasket, 13. Electrode upper cover window, 14. Scale line, 15. Connecting bolts, 16. Electrode support connecting bolts, 17. Electrode conductive support. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1-9 The present invention will be described in detail with reference to specific implementation methods. To make the purpose, technical solutions and advantages of the implementation methods clearer, the technical solutions in the implementation methods will be described clearly and completely in combination with the embodiments of the present invention. The specific implementation methods described here are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] As attached Figure 1 As shown, a lithium-ion battery in-situ detection device includes: an electrode upper cover 1, an insulator ring 2, an insulator lower cover 3, a transparent window upper cover 4, a transparent window side cover 5, a sealing ring 11, an electrode conductive gasket 12, a connecting bolt 15, an electrode support connecting bolt 16 and an electrode conductive support 17. The electrode upper cover 1 is provided with a lead-out electrode, an electrode upper cover window is provided on the electrode upper cover 1, and the electrode upper cover window is sealed and matched with the transparent window upper cover 4. The insulator ring 2 is made of insulating material, an insulator outer ring side window is provided on the insulator ring 2, and the insulator outer ring side window is sealed and matched with the transparent window side cover 5. A scale is provided on the transparent window side cover 5. Line 14, an electrode conductive support 17 is provided on the upper surface of the insulator lower cover 3, and the height of the electrode conductive support 17 is adjustable. The insulator lower cover 3 is connected to the electrode conductive support 17 by an electrode support connecting bolt 16, and the insulator ring 2 is cooperatively connected to the electrode conductive support 17. A sealing ring 11 is provided between the insulator ring 2 and the electrode conductive support 17. Inside the insulator ring 2, an electrode conductive gasket 12 is provided on the upper surface of the electrode conductive support 17, an electrode upper cover 1 is provided on the upper surface of the insulator ring 2, and an insulator lower cover 3 is provided on the lower surface of the insulator ring 2. The electrode upper cover 1, the insulator ring 2 and the insulator lower cover 3 are connected by connecting bolts 15.

[0024] Example:

[0025] As attached Figure 9 As shown, referring to the charge and discharge curve of the lithium-ion battery, the initial state and the fully charged state are selected for research.

[0026] Initial state:

[0027] Remove the transparent window cover 4 from the electrode cover 1, and place the aluminum negative electrode sheet 6, diaphragm 7, nickel-cobalt-manganese ternary positive electrode sheet 8, gasket 9, and spring 10 on the electrode conductive gasket 12 in the insulator ring 2 in sequence, as shown in the attached figure. Figure 3 As shown; the aluminum negative electrode sheet 6, the diaphragm 7, the nickel-cobalt-manganese ternary positive electrode sheet 8, the gasket 9, and the spring 10 are as shown in the attached Figure 4 As shown; in the lithium-ion battery in-situ detection device, cover the electrode cover, as shown in the attached Figure 2 As shown, at this time, through the transparent window cover 4, as shown in the attached Figure 5 As shown, the surface picture of the lithium-ion battery in the initial state is observed through the transparent window side cover 5, and the cross-sectional picture of the lithium-ion battery in the initial state is shown in the attached Figure 6 shown.

[0028] Fully charged:

[0029] In the aluminum negative electrode sheet 6, diaphragm 7, nickel-cobalt-manganese ternary positive electrode sheet 8, gasket 9, and spring 10, the nickel-cobalt-manganese ternary material is used as the positive electrode, the aluminum foil is used as the negative electrode, and the polyethylene material is used as the diaphragm. Remove the transparent window cover 4 from the electrode cover 1, and add an electrolyte of 1M LiPF6, EC:EMC:DEC=1:1:1, and an additive of 2% VC into the insulator ring 2; connect the electrode cover 1 to the negative electrode, and connect the electrode support bolt 16 to the positive electrode, as shown in the attached figure. Figure 3 As shown in the attached figure, the volume expansion evolution law and reaction mechanism of the aluminum negative electrode during the reaction process are studied. Figure 7 As shown, the surface picture of the lithium-ion battery in a fully charged state is observed through the transparent window side cover 5, and the cross-sectional picture of the lithium-ion battery in a fully charged state is shown in the attached Figure 8 As shown, it is estimated that the total thickness of the electrode increases by about 20% when fully charged, and there are slight lines on the surface of the aluminum negative electrode, indicating that the volume expansion occurs after full charge.

[0030] The insulator ring 2 is preferably made of insulating material and is connected to other parts by bolts. There is a window on the side, which can observe the reaction of the electrode cross section in situ, and the scale on it can measure changes such as the thickness of the electrode; the transparent window cover 4 is made of transparent conductive material, which can observe and detect the reaction process of the electrode in situ; the diaphragm 7 separates the positive and negative electrodes; the gasket 9 supports and conducts electricity; the spring 10 adjusts the overall thickness and compresses the electrode material; the sealing ring 11 plays a sealing role, and is preferably made of corrosion-resistant insulating material; the electrode conductive gasket 12 is preferably made of conductive material, such as steel, to adjust the overall thickness; the electrode conductive support 17 is preferably made of conductive material, can adjust the height, and is equipped with a lead-out electrode.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A lithium-ion battery in-situ detection device, characterized in that it include: An electrode upper cover (1), an insulator ring (2), an insulator lower cover (3), a transparent window upper cover (4), a transparent window side cover (5), a connecting bolt (15), an electrode support connecting bolt (16) and an electrode conductive support (17); an electrode upper cover window is provided on the electrode upper cover (1); the electrode upper cover window is sealed and connected to the transparent window upper cover (4); an insulator outer ring side window is provided on the insulator ring (2); the insulator outer ring side window is sealed and connected to the transparent window side cover (5); and a transparent window side cover (5) is provided. A scale line (14) is provided on the upper surface of the insulator lower cover (3), an electrode conductive support (17) is provided, the insulator lower cover (3) and the electrode conductive support (17) are connected via electrode support connecting bolts (16), the insulator ring (2) and the electrode conductive support (17) are cooperatively connected, an electrode upper cover (1) is provided on the upper surface of the insulator ring (2), an insulator lower cover (3) is provided on the lower surface of the insulator ring (2), and the electrode upper cover (1), the insulator ring (2) and the insulator lower cover (3) are connected via connecting bolts (15).

2. The lithium-ion battery in-situ detection device according to claim 1, wherein: It also includes a sealing ring (11), which is arranged between the insulating ring (2) and the electrode conductive support (17).

3. The lithium-ion battery in-situ detection device according to claim 1, wherein: It also includes: an electrode conductive gasket (12), which is arranged on the upper surface of the electrode conductive support (17) inside the insulating ring (2).

4. The lithium-ion battery in-situ detection device according to claim 1, wherein: The electrode upper cover (1) is provided with a lead-out electrode.

5. The lithium-ion battery in-situ detection device according to claim 1, wherein: The insulator ring (2) is made of insulating material.

6. The lithium-ion battery in-situ detection device according to claim 1, characterized in that: The electrode conductive support (17) is height-adjustable.

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