Lithium ion battery cell structure

Abstract

The utility model discloses a lithium ion battery cell structure, which relates to the technical field of lithium ion battery cells and comprises a lithium ion battery body, a cell body is mounted in the lithium ion battery body, and a first protective sleeve and a second protective sleeve are clamped at the top end of the lithium ion battery body. With the adoption of the structure, during use, the first protective sleeve and the second protective sleeve are clamped with each other, so that the corners of the lithium ion battery body can be effectively protected, the corners of the lithium ion battery body can be prevented from being collided, and due to the existence of the rubber pad, the rubber pad has good anti-skid capability and rubber shock absorption capability, so that the service life of the lithium ion battery body is prolonged. Meanwhile, the lithium ion battery core has good elasticity, so that the secondary protection effect can be achieved while the position installation stability of the first protection sleeve and the second protection sleeve is improved, the pole pieces can be prevented from being collided or extruded to deform, and the service life of the lithium ion battery core can be effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium - ion battery cells, and particularly relates to a structure of a lithium - ion battery cell. Background Technique

[0002] The lithium - ion battery cell is the core part of the lithium - ion battery, mainly composed of a positive electrode, a negative electrode, a separator, an electrolyte and a casing. The positive electrode material is mostly lithium cobaltate, lithium manganate, lithium iron phosphate or ternary materials, etc. The negative electrode material is commonly graphite, and the electrolyte is composed of lithium salts and organic solvents. The lithium - ion battery cell has the advantages of high energy density, long cycle life, no memory effect, etc., and is widely used in mobile phones, laptop computers, electric vehicles and other fields. As the power storage part in the rechargeable battery, the quality of the cell directly determines the overall performance and quality of the rechargeable battery.

[0003] The Chinese patent with the publication number of "CN209691836U" discloses a structure of a lithium - ion battery cell, belonging to the technical field of lithium - ion batteries. The specific technical solution is as follows: A structure of a lithium - ion battery cell includes a positive electrode sheet, a negative electrode sheet and a separator. The separator is located between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive electrode coating. The negative electrode sheet includes a negative current collector and a negative electrode coating. The cell structure further includes at least one positive electrode tab and at least one negative electrode tab.

[0004] The lithium - ion battery electrode sheet is relatively weak itself, and its positions are all at the corners of the lithium - ion battery. During use, the corner positions are easily knocked or squeezed. The electrode sheet being affected by knocking or squeezing may lead to problems such as corner wrinkles and serious deformation of the electrode sheet, which will cause uneven thickness of the electrode sheet, thereby triggering inconsistencies in the distribution of the internal electrolyte and charge - discharge current of the battery, accelerating the degradation of battery performance. In addition, the deformation of the electrode sheet and the wrinkles of the corner materials are also likely to cause internal short - circuit of the battery. Summary of the Utility Model

[0005] Aiming at the problems mentioned in the background technique, the purpose of the utility model is to provide a structure of a lithium - ion battery cell to solve the problems raised in the above - mentioned background technique.

[0006] The above - mentioned technical purpose of the utility model is achieved through the following technical solutions:

[0007] A lithium-ion battery cell structure includes a lithium-ion battery body. An electrode body is installed inside the lithium-ion battery body. A first protective sleeve and a second protective sleeve are both clamped at the top of the lithium-ion battery body. Arc-shaped grooves matching the lithium battery body are opened at the bottoms of the first protective sleeve and the second protective sleeve. A rubber pad is fixedly connected to the inner side of the arc-shaped groove. The rubber pad covers the inner side of the arc-shaped groove. The position of the bottom end of the rubber pad is in contact with the position of the top end of the lithium-ion battery body. The positions of the rubber pads are symmetrical to the corners of the electrode body. A protective film is sleeved outside the lithium-ion battery body. The protective film covers the outside of the lithium-ion battery body.

[0008] As a preferred technical solution, a clamping block is connected to one side of the first protective sleeve, and a clamping groove matching the clamping block is opened on the other side of the second protective sleeve. The clamping block is clamped inside the clamping groove. Both the first protective sleeve and the second protective sleeve are clamped to the top of the lithium-ion battery body through the clamping block and the clamping groove.

[0009] As a preferred technical solution, a sealing ring is connected to one side of the first protective sleeve. The clamping block is located inside the sealing ring close to it. A limiting groove matching the sealing ring is opened on the other side of the second protective sleeve. The sealing ring covers the inner side of the limiting groove.

[0010] As a preferred technical solution, a heat-resistant layer is provided on the outside of the protective film. The thickness of the heat-resistant layer is 0.05 - 0.08 cm. The heat-resistant layer covers the outside of the protective film. The heat-resistant layer is made of polyimide material.

[0011] As a preferred technical solution, the inner side of the protective film is in contact with the outside of the lithium-ion battery body. An anti-corrosion layer is provided on the inner side of the protective film. The thickness of the anti-corrosion layer is 1 cm. The anti-corrosion layer covers the inner side of the protective film. The anti-corrosion layer is a polymer coating.

[0012] As a preferred technical solution, a diaphragm layer is provided inside the lithium-ion battery body. The thickness of the diaphragm layer is 1 cm. The diaphragm layer is located outside the electrode body close to it. The diaphragm layer is made of polyolefin material.

[0013] As a preferred technical solution, an electric double layer is provided inside the lithium-ion battery body. The thickness of the electric double layer is 1 cm. The electric double layer covers the inside of the lithium-ion battery body. The electric double layer is made of graphene material.

[0014] In summary, the present utility model mainly has the following beneficial effects:

[0015] First, during use, the mutual snap connection of the first protective sleeve and the second protective sleeve can effectively protect the corner positions of the lithium-ion battery body, preventing the corners of the lithium-ion battery body from being bumped. Due to the presence of the rubber pad, the rubber pad has good anti-slip ability and rubber shock-absorbing ability, and also has good elasticity itself. While improving the installation stability of the first protective sleeve and the second protective sleeve, it can also play a secondary protective role, thereby preventing the electrode sheets from being deformed due to being bumped or squeezed, and effectively improving the service life of the lithium-ion battery cell.

[0016] Second, since the first protective sleeve and the second protective sleeve are fixed by the snap connection principle, when it is necessary to disassemble the two, the snap block can be pulled out of the card slot, which is also beneficial for the user to disassemble and maintain the first protective sleeve or the second protective sleeve later. Due to the presence of the sealing ring, when the first protective sleeve and the second protective sleeve are snap-connected, the sealing ring can effectively seal the connection point between the two, thereby effectively improving the overall sealing protection performance, and its protective film can also effectively protect the outside of the lithium-ion battery body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model.

[0018] Figure 2 is a schematic structural diagram of the first protective sleeve of the present utility model.

[0019] Figure 3 is a schematic structural diagram of the second protective sleeve of the present utility model.

[0020] Figure 4 is a schematic structural diagram of the protective film of the present utility model.

[0021] Figure 5 is a schematic cross-sectional structural diagram of the lithium-ion battery body of the present utility model.

[0022] Reference numerals: 1, lithium-ion battery body; 2, first protective sleeve; 3, second protective sleeve; 4, arc groove; 5, rubber pad; 6, snap block; 7, sealing ring; 8, card slot; 9, limit groove; 10, protective film; 11, heat-resistant layer; 12, anti-corrosion layer; 13, cell body; 14, diaphragm layer; 15, double electric layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiment

[0024] Reference Figures 1 to 5, A lithium-ion battery cell structure of this embodiment includes a lithium-ion battery body 1. An electrode core body 13 is installed inside the lithium-ion battery body 1. First protective sleeves 2 and second protective sleeves 3 are respectively clamped at the top of the lithium-ion battery body 1. Arc-shaped grooves 4 matching the lithium battery body are respectively opened at the bottoms of the first protective sleeve 2 and the second protective sleeve 3. A rubber pad 5 is fixedly connected to the inner side of the arc-shaped groove 4. The rubber pad 5 covers the inner side of the arc-shaped groove 4. The position of the bottom end of the rubber pad 5 is in contact with the position of the top end of the lithium-ion battery body 1. The positions of the rubber pad 5 are symmetric with respect to the corners of the electrode core body 13. A protective film 10 is sleeved on the outer side of the lithium-ion battery body 1. The protective film 10 covers the outer side of the lithium-ion battery body 1. There are two first protective sleeves 2 and two second protective sleeves 3 respectively, and they are respectively clamped at the top and bottom of the lithium-ion battery body 1. During use, the mutual clamping of the first protective sleeve 2 and the second protective sleeve 3 can effectively protect the corner positions of the lithium-ion battery body 1, and can prevent the corner positions of the lithium-ion battery body from being knocked. Due to the existence of the rubber pad 5, the rubber pad 5 has good anti-slip ability and rubber shock-absorbing ability, and at the same time has good elasticity itself. While improving the installation stability of the positions of the first protective sleeve 2 and the second protective sleeve 3, it can also play a role of secondary protection, thereby being able to prevent the pole piece from being deformed due to being knocked or squeezed, and can effectively improve the service life of the lithium-ion battery cell.

[0025] Reference Figures 1 to 3 , A clamping block 6 is fixedly connected to one side of the first protective sleeve 2. A clamping groove 8 matching the clamping block 6 is opened on the other side of the second protective sleeve 3. The clamping block 6 is clamped inside the clamping groove 8. The first protective sleeve 2 and the second protective sleeve 3 are both clamped at the top of the lithium-ion battery body 1 through the clamping block 6 and the clamping groove 8. Since the first protective sleeve 2 and the second protective sleeve 3 are fixed by the clamping principle, when it is necessary to disassemble the two, just pull out the clamping block 6 from the clamping groove 8, which is also beneficial for the user to disassemble and maintain the first protective sleeve 2 or the second protective sleeve 3 later.

[0026] Reference Figures 1 to 3 , A sealing ring 7 is connected to one side of the first protective sleeve 2. The clamping block 6 is located inside the sealing ring 7 close to it. A limiting groove 9 matching the sealing ring 7 is opened on the other side of the second protective sleeve 3. The sealing ring 7 covers the inner side of the limiting groove 9. Due to the existence of the sealing ring 7, when the first protective sleeve 2 and the second protective sleeve 3 are clamped, the sealing ring 7 can effectively seal the connection point between the two, thereby effectively improving its overall sealing protection performance.

[0027] Reference Figure 1 And Figure 4, a heat-resistant layer 11 is provided on the outer side of the protective film 10. The thickness of the heat-resistant layer 11 is one centimeter. The heat-resistant layer 11 covers the outer side of the protective film 10. The heat-resistant layer 11 is made of polyimide material. Due to the existence of the heat-resistant layer 11, polyimide is a polymer material with a stable chemical structure and excellent properties such as high temperature resistance and chemical corrosion resistance. Thus, it can effectively improve the high-temperature resistance of the outer side of the lithium-ion battery body 1.

[0028] Reference Figure 1 With Figure 4 , the inner side of the protective film 10 is attached to the outer side of the lithium-ion battery body 1. An anti-corrosion layer 12 is provided on the inner side of the protective film 10. The thickness of the anti-corrosion layer 12 is one centimeter. The anti-corrosion layer 12 covers the inner side of the protective film 10. The anti-corrosion layer 12 is a polymer coating. Due to the existence of the anti-corrosion layer 12, the polymer coating has good corrosion resistance and chemical stability, and can effectively isolate the direct contact between the electrolyte and metal or other sensitive materials. Thus, it can effectively improve the safety and anti-corrosion performance of the cell body 13.

[0029] Reference Figure 5 , a separator layer 14 is provided inside the lithium-ion battery body 1. The thickness of the separator layer 14 is one centimeter. The separator layer 14 is located on the outer side of the cell body 13. The separator layer 14 is made of polyolefin material. Due to the existence of the separator layer 14, the polyethylene material has good mechanical strength and chemical stability, and can play a protective role of melting and shutting off when the battery overheats, preventing the battery from further heating up and causing danger. Thus, it can effectively improve the service life of the cell body 13.

[0030] Reference Figure 5 , a double electric layer 15 is provided inside the lithium-ion battery body 1. The thickness of the double electric layer 15 is one centimeter. The double electric layer 15 covers the inside of the lithium-ion battery body 1. The double electric layer 15 is made of graphene material. Due to the existence of the double electric layer 15, graphene, as an excellent two-dimensional carbon material, has a high specific surface area, high conductivity and good thermal stability. Thus, it can effectively improve the stability of the operation of the cell body 13.

[0031] Principle of use and advantages: During use, due to the presence of the diaphragm layer 14, the polyethylene material has good mechanical strength and chemical stability, and can play a protective role of melting and shutting off when the battery overheats, preventing the battery from further heating up and causing danger, thereby effectively improving the service life of the battery cell body 13. Due to the presence of the double electric layer 15, graphene, as an excellent two-dimensional carbon material, has a high specific surface area, high electrical conductivity, and good thermal stability, and can thus effectively improve the stability of the operation of the battery cell body 13. Due to the presence of the first protective sleeve 2 and the second protective sleeve 3, their mutual clamping can effectively protect the corner positions of the lithium-ion battery body 1, and can avoid bumps at the corner positions of the lithium-ion battery body. Due to the presence of the rubber pad 5, the rubber pad 5 has good anti-slip ability and rubber shock-absorbing ability, and also has good elasticity itself. While improving the installation stability of the first protective sleeve 2 and the second protective sleeve 3, it can also play a secondary protective role, and can thus avoid the deformation of the pole piece caused by bumps or extrusion, effectively improving the service life of the lithium-ion battery cell. Since the first protective sleeve 2 and the second protective sleeve 3 are fixed by the clamping principle, when it is necessary to disassemble them, the clamping block 6 can be pulled out of the clamping groove 8, which is also conducive to the user's later disassembly and maintenance of the first protective sleeve 2 or the second protective sleeve 3. Due to the presence of the sealing ring 7, when the first protective sleeve 2 and the second protective sleeve 3 are clamped, the sealing ring 7 can effectively seal the connection point between them, and can thus effectively improve its overall sealing protection. Due to the presence of the heat-resistant layer 11, polyimide is a polymer material with a stable chemical structure and excellent properties such as high temperature resistance and chemical corrosion resistance, and can thus effectively improve the high-temperature resistance of the outer side of the lithium-ion battery body 1. Due to the presence of the anti-corrosion layer 12, the polymer coating has good corrosion resistance and chemical stability, and can effectively isolate the direct contact between the electrolyte and metal or other sensitive materials, and can thus effectively improve the safety anti-corrosion of the battery cell body 13.

Claims

1. A lithium-ion battery cell structure, comprising a lithium-ion battery body (1), characterized in that: Inside the lithium-ion battery body (1), a battery core body (13) is installed. At the top of the lithium-ion battery body (1), a first protective sleeve (2) and a second protective sleeve (3) are both snap-connected. At the bottom ends of the first protective sleeve (2) and the second protective sleeve (3), arc-shaped grooves (4) matching the lithium battery body are opened. Inside the arc-shaped grooves (4), a rubber pad (5) is fixedly connected. The rubber pad (5) covers the inside of the arc-shaped grooves (4). The position of the bottom end of the rubber pad (5) is in contact with the position of the top end of the lithium-ion battery body (1). The rubber pad (5) is symmetrically located at the corners of the battery core body (13). The outer side of the lithium-ion battery body (1) is sleeved with a protective film (10), and the protective film (10) covers the outer side of the lithium-ion battery body (1).

2. The structure of a lithium-ion battery cell according to claim 1, wherein: On one side of the first protective sleeve (2), a clamping block (6) is fixedly connected. On the other side of the second protective sleeve (3), a clamping groove (8) matching the clamping block (6) is opened. The clamping block (6) is snap-connected inside the clamping groove (8). The first protective sleeve (2) and the second protective sleeve (3) are both snap-connected to the top end of the lithium-ion battery body (1) through the clamping block (6) and the clamping groove (8).

3. The structure of a lithium-ion battery cell according to claim 2, characterized in that: On one side of the first protective sleeve (2), a sealing ring (7) is fixedly connected. The clamping block (6) is located inside the sealing ring (7) that is close to it. On the other side of the second protective sleeve (3), a limiting groove (9) matching the sealing ring (7) is opened. The sealing ring (7) covers the inside of the limiting groove (9).

4. A lithium-ion battery cell structure according to claim 1, characterized in that: On the outer side of the protective film (10), a heat-resistant layer (11) is provided. The thickness of the heat-resistant layer (11) is one centimeter. The heat-resistant layer (11) covers the outer side of the protective film (10). The heat-resistant layer (11) is made of polyimide material.

5. A lithium-ion battery cell structure according to claim 1, characterized in that: The inner side of the protective film (10) is in contact with the outer side of the lithium-ion battery body (1). On the inner side of the protective film (10), an anti-corrosion layer (12) is provided. The anti-corrosion layer (12) covers the inner side of the protective film (10). The anti-corrosion layer (12) is a polymer coating.

6. A lithium-ion battery cell structure according to claim 1, characterized in that: Inside the lithium-ion battery body (1), a diaphragm layer (14) is provided. The diaphragm layer (14) is located outside the battery core body (13) that is close to it. The diaphragm layer (14) is made of polyolefin material.

7. A lithium-ion battery cell structure according to claim 1, characterized in that: Inside the lithium-ion battery body (1), an electric double layer (15) is provided. The thickness of the electric double layer (15) is one centimeter. The electric double layer (15) covers the inside of the lithium-ion battery body (1). The electric double layer (15) is made of graphene material.

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