Natural graphite negative electrode structure

Abstract

The utility model discloses a natural graphite negative electrode structure and relates to the technical field of lithium batteries. The lithium ion battery is technically characterized by comprising a supporting shell, a lithium ion battery cell body is arranged in the supporting shell, an electrode exposure opening is formed in the end of the supporting shell, and a graphite electrode plate located on the inner side of the electrode exposure opening is arranged at one end of the lithium ion battery cell body; a sealing structure and a sealing reinforcing structure are further included. The sealing structure is arranged at the electrode exposure port at the end part of the supporting shell and is used for sealing the electrode exposure port and the graphite electrode plate; and the sealing reinforcing structure is arranged on the graphite electrode plate and is used for reinforcing the sealing degree of the sealing structure. According to the device, through the sealing structure and the sealing reinforcing structure, under the condition that the interior of the battery expands, the sealing reinforcing structure is further extruded on the sealing structure, so that the sealing strength of the negative electrode part of the battery is enhanced, the expansion of the battery in a charged state is dealt with, the phenomena of shell bulging, explosion and the like of the battery are avoided, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a natural graphite negative electrode structure. Background Art

[0002] Lithium-ion batteries have been widely used in many fields due to their advantages such as high operating voltage, high energy density, long cycle life, and low self-discharge. At present, with the development of economy and technology, many application fields have put forward higher requirements on the energy density and cycle life of lithium-ion batteries. The negative electrode of lithium-ion batteries is one of the key factors to increase battery capacity and extend cycle life. At present, the most studied and applied lithium-ion battery negative electrode materials are graphite materials, mainly including natural graphite and artificial graphite. Natural graphite has abundant reserves in my country, low price, and high crystallinity. When used as a negative electrode material for lithium-ion batteries, it has the advantages of good processing performance, high specific capacity, and high compaction density. It has become one of the most widely used negative electrode materials for lithium-ion batteries in production.

[0003] However, when natural graphite is used as the negative electrode of a lithium-ion battery, the negative electrode sheet expands greatly when charged. At the same time, the lithium-ion battery cell body also often expands. When multiple cycles or large currents pass through, its cycle performance will seriously deteriorate, and even battery bulging and explosion may occur. In order to cope with the above defects, a natural graphite negative electrode structure is designed. Utility Model Content

[0004] The purpose of the utility model is to provide a natural graphite negative electrode structure in order to solve the above problems.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model discloses a natural graphite negative electrode structure, comprising:

[0007] A supporting shell, wherein a lithium-ion battery cell body is disposed inside the supporting shell, an electrode exposure opening is provided at an end of the supporting shell, and a graphite electrode sheet located inside the electrode exposure opening is provided at one end of the lithium-ion battery cell body;

[0008] Also includes a sealing structure and a sealing reinforcement structure;

[0009] The sealing structure is arranged at the electrode exposure opening at the end of the supporting shell to seal between the electrode exposure opening and the graphite electrode sheet;

[0010] The sealing reinforcement structure is arranged on the graphite electrode sheet to enhance the sealing degree of the sealing structure.

[0011] Further, the sealing structure includes a sealing ring accommodating groove and a first sealing ring;

[0012] The sealing ring receiving groove is arranged at the lower part of the electrode exposure opening and communicates with the inner space of the supporting shell;

[0013] The first sealing ring is arranged in the sealing ring accommodating groove and is squeezed between the graphite electrode sheet and the inner wall of the sealing ring accommodating groove.

[0014] Furthermore, the diameter of the sealing ring accommodating groove is gradually reduced from bottom to top.

[0015] Furthermore, the cross section of the first sealing ring is circular.

[0016] Furthermore, the sealing reinforcement structure includes a second sealing ring, which is sleeved on the outside of the graphite electrode sheet and connected to the end surface of the lithium-ion battery cell body and pressed against the first sealing ring.

[0017] Furthermore, the cross section of the second sealing ring is a right triangle, and two adjacent side surfaces at the right angle of the second sealing ring are respectively connected to the side surface of the graphite electrode sheet and the end surface of the lithium-ion battery cell body, and the inclined surface is pressed tightly against the first sealing ring.

[0018] In the above technical solution, the utility model provides a natural graphite negative electrode structure having the following

[0019] Beneficial effects:

[0020] The device uses a sealing structure and a sealing reinforcement structure. When the battery expands inside, the sealing reinforcement structure is further squeezed on the sealing structure to enhance the sealing strength of the negative electrode of the battery, so as to cope with the battery expansion in a charged state, avoid battery bulging, explosion and the like, and improve its safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic structural diagram of a natural graphite negative electrode structure provided in an embodiment of the utility model;

[0023] Figure 2 A front view of a sealing ring receiving groove of a natural graphite negative electrode structure provided by an embodiment of the utility model;

[0024] Figure 3A schematic structural diagram of a supporting shell of a natural graphite negative electrode structure provided in an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1. Support shell; 2. Lithium-ion battery cell body; 3. Electrode exposure port; 4. Graphite electrode sheet; 5. Sealing ring receiving groove; 6. First sealing ring; 7. Second sealing ring. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] See also Figure 1-3 , a natural graphite negative electrode structure, comprising:

[0029] A supporting shell 1, a lithium-ion battery cell body 2 is arranged inside the supporting shell 1, an electrode exposure opening 3 is opened at the end of the supporting shell 1, and a graphite electrode sheet 4 located inside the electrode exposure opening 3 is arranged at one end of the lithium-ion battery cell body 2, that is, the graphite electrode sheet 4 is exposed outside the supporting shell 1 through the electrode exposure opening 3 for connection to electricity;

[0030] Also includes a sealing structure and a sealing reinforcement structure;

[0031] The sealing structure is arranged at the electrode exposure opening 3 at the end of the supporting shell 1 to seal between the electrode exposure opening 3 and the graphite electrode sheet 4;

[0032] The sealing reinforcement structure is arranged on the graphite electrode sheet 4 to enhance the sealing degree of the sealing structure, so that the sealing strength of the lithium battery is further enhanced.

[0033] In summary, the device has a sealing structure and a sealing reinforcement structure. When the battery expands inside, the sealing reinforcement structure is further squeezed on the sealing structure to enhance the sealing strength of the negative electrode of the battery to cope with the battery expansion in a charged state, avoid battery bulging, explosion and other phenomena, and improve its safety.

[0034] Further, the sealing structure includes a sealing ring receiving groove 5 and a first sealing ring 6;

[0035] The sealing ring receiving groove 5 is provided at the lower part of the electrode exposure opening 3 and communicates with the inner space of the supporting shell 1;

[0036] The first sealing ring 6 is disposed in the sealing ring accommodating groove 5 and is squeezed between the graphite electrode sheet 4 and the inner wall of the sealing ring accommodating groove 5 , so that the first sealing ring 6 forms a first seal between the graphite electrode sheet 4 and the inner wall of the sealing ring accommodating groove 5 .

[0037] Furthermore, the diameter of the sealing ring accommodating groove 5 is gradually reduced from bottom to top, so as to limit the first sealing ring 6 and prevent the first sealing ring 6 from being squeezed out of the electrode exposure opening 3 .

[0038] Furthermore, the cross section of the first sealing ring 6 is circular.

[0039] Furthermore, the sealing reinforcement structure includes a second sealing ring 7 which is sleeved on the outside of the graphite electrode sheet 4 and connected to the end surface of the lithium-ion battery cell body 2 and pressed against the first sealing ring 6 .

[0040] Furthermore, the cross section of the second sealing ring 7 is a right triangle, and the adjacent two side surfaces at the right angle of the second sealing ring 7 are respectively connected to the side surface of the graphite electrode sheet 4 and the end surface of the lithium-ion battery cell body 2, and the inclined surface is pressed tightly against the first sealing ring 6.

[0041] Specifically, by utilizing the structure of the second sealing ring 7, when a collision occurs inside the lithium battery, the second sealing ring 7 is stretched to increase its diameter, or when the internal space of the supporting shell 1 is fixed, the internal space expands to push the second sealing ring 7 upward, and then passively further presses on the first sealing ring 6, thereby enhancing the sealing performance. The first sealing ring 6 is limited by the sealing ring accommodating groove 5 and cannot be separated from the supporting shell 1, thereby stably ensuring the sealing of the graphite negative electrode position of the battery.

[0042] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A natural graphite negative electrode structure, characterized in that: include: A supporting shell (1), wherein a lithium-ion battery cell body (2) is arranged inside the supporting shell (1), an electrode exposure opening (3) is provided at an end of the supporting shell (1), and a graphite electrode sheet (4) located inside the electrode exposure opening (3) is provided at one end of the lithium-ion battery cell body (2); Also includes a sealing structure and a sealing reinforcement structure; The sealing structure is arranged at the electrode exposure opening (3) at the end of the supporting shell (1) to seal between the electrode exposure opening (3) and the graphite electrode sheet (4); The sealing reinforcement structure is arranged on the graphite electrode sheet (4) to enhance the sealing degree of the sealing structure.

2. A natural graphite negative electrode structure according to claim 1, characterized in that: The sealing structure comprises a sealing ring accommodating groove (5) and a first sealing ring (6); The sealing ring accommodating groove (5) is provided at a lower position of the electrode exposure opening (3) and is communicated with the internal space of the supporting shell (1); The first sealing ring (6) is arranged in the sealing ring receiving groove (5) and is squeezed between the graphite electrode sheet (4) and the inner wall of the sealing ring receiving groove (5).

3. A natural graphite negative electrode structure according to claim 2, characterized in that, The diameter of the sealing ring accommodating groove (5) is gradually reduced from bottom to top.

4. A natural graphite negative electrode structure according to claim 3, characterized in that: The first sealing ring (6) has a circular cross-section.

5. A natural graphite negative electrode structure according to claim 4, characterized in that: The sealing reinforcement structure comprises a second sealing ring (7), which is sleeved on the outside of the graphite electrode sheet (4), connected to the end surface of the lithium-ion battery cell body (2), and pressed against the first sealing ring (6).

6. A natural graphite negative electrode structure according to claim 5, characterized in that: The cross section of the second sealing ring (7) is a right triangle, and two adjacent side surfaces at the right angle of the second sealing ring (7) are respectively connected to the side surface of the graphite electrode sheet (4) and the end surface of the lithium-ion battery cell body (2), and the inclined surface is pressed tightly against the first sealing ring (6).

Images