Button lithium ion battery

Abstract

The utility model discloses a button lithium ion battery which comprises a positive pole shell, a negative pole cover is arranged on one side of the positive pole shell, a containing cavity is formed between the positive pole shell and the negative pole cover, a pole core and electrolyte are arranged in the containing cavity, and the pole core comprises a positive pole piece structure, a negative pole piece structure and a diaphragm. The positive plate structure comprises a metal substrate (aluminum foil) and an active material, the negative plate structure comprises a metal substrate (copper foil) and an active material, and the diaphragm is arranged between the positive plate structure and the negative plate structure and is in contact with the end surfaces of the active materials in the positive plate structure and the negative plate structure respectively; the positive plate structure, the negative plate structure and the diaphragm are integrally designed during machine manufacturing, so that manual placement of the components is avoided; direct integration is achieved, the diameter is small, the thickness is small, the size is small, efficiency is high, quality is good, and cost is low; and the button lithium ion battery can be produced on a large scale and is relatively practical.

Description

Technical Field

[0001] The utility model relates to the technical field of button lithium ion batteries, in particular to a button lithium ion battery. Background Art

[0002] With the development of society, button batteries have also experienced rapid growth. Button batteries, also known as button batteries, are batteries with dimensions similar to a small button, generally with a larger diameter and a thinner thickness. Button batteries are categorized based on their appearance, and corresponding battery types include cylindrical batteries, prismatic batteries, and special-shaped batteries.

[0003] The existing button lithium-ion battery positive electrode sheet structure, negative electrode sheet structure and separator are not designed as an integrated whole during machine manufacturing. The above components need to be placed separately by hand, resulting in a button lithium-ion battery with a large diameter or a thick thickness, low efficiency and failure to meet the market demand for further miniaturization. Therefore, we propose a button lithium-ion battery to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the present utility model is to provide a button lithium-ion battery to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A button lithium-ion battery comprises: a positive electrode shell, a negative electrode cover provided on one side of the positive electrode shell, a receiving cavity provided between the positive electrode shell and the negative electrode cover, a sealing ring provided at the connection between the positive electrode shell and the negative electrode cover, a pole core and an electrolyte provided inside the receiving cavity, the pole core comprising a positive electrode sheet structure, a negative electrode sheet structure, and a separator, a first active material powder layer provided on the upper end surface of the substrate of the positive electrode sheet structure, a second active material powder layer provided on the upper end surface of the substrate of the negative electrode sheet structure, and two end surfaces of the separator respectively contacting the first active material powder layer and the second active material powder layer.

[0007] As a further solution of the present invention: one side of the positive electrode sheet structure and the negative electrode sheet structure is respectively provided with a first active material powder layer and a second active material powder layer, and the other side that is not in contact with the diaphragm is not provided with an active material powder layer, that is, single-sided powder coating or double-sided powder coating.

[0008] As a further solution of the present invention: the thickness of the positive electrode sheet structure, the separator and the negative electrode sheet structure after being bonded together is 0.1 to 0.15 mm.

[0009] As a further solution of the present invention: the substrate of the positive electrode sheet structure is an aluminum foil substrate.

[0010] As a further solution of the present invention: the substrate of the negative electrode sheet structure is a copper foil substrate.

[0011] As a further solution of the present invention: the size of the positive electrode sheet structure is smaller than that of the negative electrode sheet structure.

[0012] As a further solution of the present invention: the size of the negative electrode sheet structure is greater than or equal to the size of the separator.

[0013] As a further solution of the present invention: insulating tape is respectively provided on the inner sides of the positive electrode shell and the negative electrode cover, and the middle part of the insulating tape is a ring-shaped hollow structure.

[0014] As a further solution of the present invention: a connecting spring is provided on the inner side of the positive electrode shell, one side of the connecting spring is electrically connected to the positive electrode shell, and the other side is electrically connected to the aluminum foil; a connecting spring is provided on the inner side of the negative electrode cover, one side of the connecting spring is electrically connected to the negative electrode cover, and the other side is electrically connected to the copper foil.

[0015] As a further solution of the present invention: the pole core is in the shape of a disc, a square or a polygon.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The positive electrode sheet structure, the negative electrode sheet structure and the diaphragm of the button lithium-ion battery are designed to be integrated during machine manufacturing, eliminating the need for manual installation of the diaphragm; or the diaphragm is designed to be integrated with the positive electrode sheet structure or the negative electrode sheet structure, eliminating the need for manual installation of the diaphragm, and then the other electrode sheet can be covered; direct integration has a small diameter, thin thickness, small size, high efficiency, good quality and low cost; the button lithium-ion battery can be mass-produced, and is relatively practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 2 It is a structural schematic diagram of the receiving chamber in the utility model.

[0020] Figure 3 It is a structural diagram of the positive electrode sheet structure or the negative electrode sheet structure in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the connection parts of each unit of the positive electrode sheet structure or the negative electrode sheet structure in the present invention.

[0022] Figure 5 This is a schematic structural diagram of the cross-section of the positive electrode structure in the present invention.

[0023] Figure 6It is a structural schematic diagram of the insulating tape in this utility model.

[0024] Figure 7 It is a structural diagram of the connecting spring piece of the utility model.

[0025] Among them: 1. Positive electrode shell; 2. Negative electrode cover; 3. Receiving cavity; 4. Sealing ring; 5. Electrode core; 6. Positive electrode sheet structure; 7. Negative electrode sheet structure; 8. Diaphragm; 9. First active material powder layer; 10. Second active material powder layer; 11. Insulating tape. DETAILED DESCRIPTION

[0026] In one embodiment, Figures 1-4 As shown, a button lithium ion battery comprises: a positive electrode shell 1, a negative electrode cover 2 is provided on one side of the positive electrode shell 1, a receiving chamber 3 is provided between the positive electrode shell 1 and the negative electrode cover 2, a sealing ring 4 is provided at the connection between the positive electrode shell 1 and the negative electrode cover 2, a pole core 5 and an electrolyte are provided inside the receiving chamber 3, the pole core 5 comprises a positive electrode sheet structure 6, a negative electrode sheet structure 7, and a diaphragm 8, a first active material powder layer 9 is provided on the upper end surface of the substrate (aluminum foil) of the positive electrode sheet structure 6, a second active material powder layer 10 is provided on the upper end surface of the substrate (copper foil) of the negative electrode sheet structure 7, and the first active material powder layer 9 and the second active material powder layer 10 are respectively attached to the two end surfaces of the diaphragm 8; the positive electrode sheet structure 6, the negative electrode sheet structure 7 and the diaphragm 8 are integrated in a design during machine manufacturing, eliminating the need for manual application of the diaphragm 8 and directly integrating them, with a small diameter, thin thickness, small size, high efficiency, good quality and low cost; the button lithium ion battery can be mass-produced, which is relatively practical;

[0027] The positive electrode sheet structure 6, the negative electrode sheet structure 7 and the diaphragm 8 are an integral whole, so that the positive electrode sheet structure 6, the negative electrode sheet structure 7 and the diaphragm 8 are not easily misaligned, the formed electrode core 5 is also more neat, and the quality of the produced electrode core 5 is better; the diaphragm 8 has adhesiveness, and the positive electrode sheet structure 6 and the negative electrode sheet structure 7 can be directly pressed into one piece; the diaphragm 8 is designed to be integrated with the positive electrode sheet structure 6 or the negative electrode sheet structure 7, eliminating the need to manually put on the diaphragm 8 and then cover the other electrode sheet; it has a small diameter, thin thickness, small size, high efficiency, good quality and low cost.

[0028] like Figures 1-4As shown, one side of the positive electrode sheet structure 6 and the negative electrode sheet structure 7 are respectively provided with a first active material powder layer 9 and a second active material powder layer 10, and the other side not in contact with the diaphragm is not provided with an active material powder layer, and powder can be applied on both sides; the thickness of the positive electrode sheet structure 6, the diaphragm 8 and the negative electrode sheet structure 7 after three-in-one bonding is 0.1 to 0.15 mm; the substrate of the positive electrode sheet structure 6 is an aluminum foil substrate; the substrate of the negative electrode sheet structure 7 is a copper foil substrate; the size of the positive electrode sheet structure 6 is smaller than that of the negative electrode sheet structure 7; the size of the negative electrode sheet structure 7 is greater than or equal to the size of the diaphragm 8; the positive electrode sheet structure 6 and the negative electrode sheet structure 7 are composed of a plurality of small units, and the number of small units is odd, such as Figure 3 shown.

[0029] Reference Figure 5 , Figure 6 , the inner sides of the positive electrode shell 1 and the negative electrode cover 2 are respectively provided with insulating tape 11, and the middle part of the insulating tape 11 is a ring-shaped hollow structure; a connecting spring is provided on the inner side of the positive electrode shell 1, one side of the connecting spring (protrusion a) is electrically connected to the positive electrode shell 1, and the other side (contact surface b) is electrically connected to the aluminum foil, and a connecting spring is provided on the inner side of the negative electrode cover 2, one side of the connecting spring is electrically connected to the negative electrode cover, and the other side is electrically connected to the copper foil, and the middle part is a spot welding area c. Due to the height difference between the accommodating cavity and the pole core design, this spring can compact the pole core through the material thickness and total height to form a benign electrical connection; the pole core 5 can be made into a round piece, a square piece or a polygon; the positive electrode sheet structure 6, the negative electrode sheet structure 7 and the diaphragm 8 are integrated in design during machine production, eliminating the need for manual operation of the diaphragm 8, and are directly integrated with a small diameter, thin thickness, small size, high efficiency, good quality and low cost; the button lithium-ion battery can be mass-produced.

[0030] A button lithium-ion battery, wherein a positive electrode sheet structure 6, a negative electrode sheet structure 7, and a diaphragm 8 are integrated during machine manufacturing, eliminating the need for manual application of the diaphragm 8. Direct integration results in a small diameter, thin thickness, and small size, as well as high efficiency, good quality, and low cost. The button lithium-ion battery can be mass-produced. Alternatively, the diaphragm 8 can be integrated with the positive electrode sheet structure 6 or the negative electrode sheet structure 7, eliminating the need for manual application of the diaphragm 8, and the other electrode sheet can then be covered, which is relatively practical.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A button lithium ion battery, characterized in that: include: A positive electrode shell (1), a negative electrode cover (2) is provided on one side of the positive electrode shell (1), a receiving cavity (3) is provided between the positive electrode shell (1) and the negative electrode cover (2), a sealing ring (4) is provided at the connection between the positive electrode shell (1) and the negative electrode cover (2), a pole core (5) and an electrolyte are provided inside the receiving cavity (3), the pole core (5) comprises a positive electrode sheet structure (6), a negative electrode sheet structure (7), and a diaphragm (8), a first active material powder layer (9) is provided on the upper end surface of the substrate of the positive electrode sheet structure (6), a second active material powder layer (10) is provided on the upper end surface of the substrate of the negative electrode sheet structure (7), and two end surfaces of the diaphragm (8) are respectively bonded to the first active material powder layer (9) and the second active material powder layer (10).

2. A button lithium ion battery according to claim 1, characterized in that: One side of the positive electrode sheet structure (6) and the negative electrode sheet structure (7) is provided with a first active material powder layer (9) and a second active material powder layer (10), respectively, and the other side not in contact with the diaphragm is not provided with an active material powder layer, i.e., single-sided powder coating or double-sided powder coating.

3. A button lithium ion battery according to claim 2, characterized in that: The thickness of the positive electrode sheet structure (6), the separator (8) and the negative electrode sheet structure (7) after being bonded together is 0.1 to 0.15 mm.

4. A button lithium ion battery according to claim 1, characterized in that: The substrate of the positive electrode sheet structure (6) is an aluminum foil substrate.

5. The button lithium ion battery according to claim 1, characterized in that: The substrate of the negative electrode sheet structure (7) is a copper foil substrate.

6. The button lithium ion battery according to claim 1, characterized in that: The size of the positive electrode sheet structure (6) is smaller than the size of the negative electrode sheet structure (7).

7. The button lithium ion battery according to claim 1, characterized in that: The size of the negative electrode sheet structure (7) is greater than or equal to the size of the separator (8).

8. The button lithium ion battery according to claim 1, characterized in that: Insulating tape (11) is respectively provided on the inner sides of the positive electrode shell (1) and the negative electrode cover (2), and the middle part of the insulating tape (11) is a ring-shaped hollow structure.

9. The button lithium ion battery according to claim 1, characterized in that: A connecting spring is provided on the inner side of the positive electrode shell (1), one side of the connecting spring is electrically connected to the positive electrode shell (1), and the other side is electrically connected to the aluminum foil; a connecting spring is provided on the inner side of the negative electrode cover (2), one side of the connecting spring is electrically connected to the negative electrode cover, and the other side is electrically connected to the copper foil.

10. The button lithium ion battery according to claim 1, characterized in that: The pole core (5) is in the shape of a disc, a square or a polygon.

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