Cylindrical lithium ion battery

Abstract

The utility model discloses a cylindrical lithium ion battery, which relates to the technical field of batteries and comprises an outer casing, sealing rings are fixedly connected to the upper end and the lower end of the inner side of the outer casing, an inner casing is fixedly connected to the inner sides of the sealing rings, three battery roll cores are fixedly mounted in the inner casing, gaps exist among the battery roll cores, and the inner casing is fixedly connected with the outer casing. A plurality of heat dissipation holes are formed in the surface of the inner shell, the heat dissipation holes are communicated with gaps between the battery roll cores, and a heat dissipation groove is formed in the sealing ring. According to the cylindrical lithium ion battery, the battery roll core in the cylindrical lithium ion battery is packaged through the two-layer structure of the inner shell and the outer shell, the protection effect of the shell on the battery roll core is greatly improved, and meanwhile, high-temperature gas in the inner shell can be exhausted through the heat dissipation holes when the battery breaks down; the possibility that the battery roll core in the inner shell explodes due to the influence of high temperature is reduced, and meanwhile, high-temperature gas can be exhausted out of a cavity between the outer shell and the inner shell through the heat dissipation grooves.

Description

Technical Field

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

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Lithium-ion batteries usually have three packaging forms: square metal shell, cylindrical metal shell, and soft-pack aluminum-plastic film. Among them, the cylindrical metal shell has many advantages such as high degree of automation and excellent product consistency, making it the main packaging form in the power, energy storage, communication and other market fields.

[0003] For example, the utility model with application number 201921435056.4 discloses a cylindrical lithium-ion battery, including a cap, a shell, a battery cell, and an electrolyte. The battery cell is contained in the shell, and the electrolyte is adsorbed in the battery cell. A support rod is arranged at the center of the battery cell, and the cross section of the support rod is a regular polygonal hollow structure. The battery cell is wound into a cylindrical shape around the support rod by a positive electrode sheet, a negative electrode sheet, and a diaphragm arranged between the positive electrode sheet and the negative electrode sheet. The top and bottom ends of the battery cell are provided with positive and negative ears welded to the middle of the positive and negative electrodes. Insulating sheets are arranged between the positive and negative electrodes and the positive and negative ears. The positive ear is welded to the cap, and the negative ear is welded to the bottom of the shell. This utility model can effectively ensure the high power and high current performance of lithium-ion batteries.

[0004] The above cylindrical lithium-ion battery does not take the heat dissipation inside the battery into consideration. When the battery fails, a large amount of high-temperature gas will be generated inside the battery. If the heat inside the battery cannot be dissipated in time, an explosion may occur.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a cylindrical lithium-ion battery is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a cylindrical lithium-ion battery to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cylindrical lithium-ion battery, comprising an outer shell, wherein sealing rings are fixedly connected to the upper and lower ends of the inner side of the outer shell, an inner shell is fixedly connected to the inner side of the sealing ring, three battery roll cores are fixedly installed inside the inner shell, there are gaps between the battery roll cores, a plurality of heat dissipation holes are provided on the surface of the inner shell, the heat dissipation holes are connected to the gaps between the battery roll cores, a heat dissipation groove is provided inside the sealing ring, a plurality of holes are provided at the bottom of the heat dissipation groove, the holes are connected to the inner cavity of the outer shell, a sealing cover is movably installed inside the heat dissipation groove, a plurality of connecting rods are fixedly connected to the sealing cover on one side close to the bottom of the heat dissipation groove, a push block is fixedly connected to one end of the connecting rod, and the push block is movably engaged inside the hole.

[0008] Furthermore, a positive electrode separator is fixedly connected to the upper inner end of the inner shell, and a positive electrode component is fixedly connected to the upper end of the positive electrode separator.

[0009] Furthermore, a negative electrode separator is fixedly connected to the lower inner end of the inner shell, and a negative electrode component is fixedly connected to the lower end of the negative electrode separator.

[0010] Furthermore, both upper and lower ends of the battery coil core are fixedly connected with insulating partitions.

[0011] Furthermore, a plurality of shock-absorbing springs are fixedly connected to the outer side of the inner shell body, the shock-absorbing springs are evenly distributed on the outer side of the inner shell body in a staggered manner, and the shock-absorbing springs are movably connected to the inner side of the outer shell body.

[0012] Furthermore, a mesh protective layer is provided inside the side wall of the outer shell.

[0013] Furthermore, outer protective sleeves are fixedly installed at both upper and lower ends of the outer shell.

[0014] The utility model provides a cylindrical lithium-ion battery, which has the following beneficial effects:

[0015] Firstly, the utility model packages the internal battery core through the two-layer structure of the inner shell and the outer shell, which greatly improves the protective effect of the outer shell on the battery core. At the same time, the high-temperature gas inside the inner shell can be discharged through the heat dissipation holes when the battery fails, reducing the possibility of the battery core inside the inner shell being affected by the high temperature and exploding. At the same time, the high-temperature gas can be discharged from the cavity between the outer shell and the inner shell through the heat dissipation groove, thereby realizing protective heat dissipation of the lithium-ion battery.

[0016] Secondly, the utility model protects the inner shell by means of shock-absorbing springs, which can effectively absorb the impact force transmitted to the inner shell, reducing the possibility of damage to the battery coil core inside the inner shell due to impact. At the same time, the positive and negative electrodes of the battery are protected by the outer protective sleeve, further enhancing the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a cylindrical lithium-ion battery of the utility model;

[0018] Figure 2 This is a schematic cross-sectional view of a cylindrical lithium-ion battery of the utility model;

[0019] Figure 3 This is a schematic diagram of the inner shell structure of a cylindrical lithium-ion battery of the utility model;

[0020] Figure 4 The utility model is a schematic diagram of a sealing ring structure of a cylindrical lithium-ion battery.

[0021] In the figure: 1. outer shell; 2. sealing ring; 3. inner shell; 4. battery roll core; 5. heat dissipation hole; 6. heat dissipation groove; 7. hole; 8. sealing cover; 9. connecting rod; 10. push block; 11. positive separator; 12. positive electrode component; 13. negative separator; 14. negative electrode component; 15. insulating separator; 16. shock-absorbing spring; 17. mesh protective layer; 18. outer protective cover. DETAILED DESCRIPTION

[0022] See also Figure 1-Figure 2 The utility model provides a technical solution: a cylindrical lithium-ion battery, comprising an outer shell 1, a sealing ring 2 is fixedly connected to the upper and lower ends of the inner side of the outer shell 1, an inner shell 3 is fixedly connected to the inner side of the sealing ring 2, three battery cores 4 are fixedly installed inside the inner shell 3, and there are gaps between the battery cores 4. The outer shell 1 and the inner shell 3 are connected by the sealing ring 2, and the battery core 4 is placed through the inner shell 3. A positive separator 11 is fixedly connected to the upper end of the inner side of the inner shell 3, and a positive electrode component 12 is fixedly connected to the upper end of the positive separator 11. The positive electrode component 12 is connected to the positive electrode sheet of the battery core 4, and the positive electrode component 12 is isolated and protected by the positive separator 11. A negative separator 13 is fixedly connected to the lower end of the inner side of the inner shell 3. A negative electrode component 14 is fixedly connected to the lower end of the negative electrode separator 13, and the negative electrode component 14 is connected to the negative electrode sheet of the battery core 4. The negative electrode component 14 is isolated and protected by the negative electrode separator 13. Insulating separators 15 are fixedly connected to the upper and lower ends of the battery core 4. The insulating separator 15 is used to isolate and protect the battery core 4 inside the inner shell 3 to avoid short circuits between the battery cores 4. A mesh protective layer 17 is provided inside the side wall of the outer shell 1. The strength of the outer shell 1 is strengthened by the mesh protective layer 17 to avoid rupture of the outer shell 1 due to external force. Outer protective sleeves 18 are fixedly installed at the upper and lower ends of the outer shell 1 to protect both ends of the battery by the outer protective sleeve 18 to avoid damage to the positive and negative electrodes of the battery when it is hit.

[0023] See also Figure 2-Figure 4A plurality of heat dissipation holes 5 are provided on the surface of the inner shell 3, and the heat dissipation holes 5 are connected to the gap between the battery roll core 4. A heat dissipation groove 6 is provided inside the sealing ring 2, and a plurality of holes 7 are provided at the bottom of the heat dissipation groove 6. The holes 7 are connected to the inner cavity of the outer shell 1. A sealing cover 8 is movably installed inside the heat dissipation groove 6. A plurality of connecting rods 9 are fixedly connected to the sealing cover 8 on one side close to the bottom of the heat dissipation groove 6. A push block 10 is fixedly connected to one end of the connecting rod 9. The push block 10 is movably connected to the inside of the hole 7. The high-temperature gas generated by the battery roll core 4 is discharged from the inside of the inner shell 3 through the heat dissipation holes 5, and the push block 1 inside the hole 7 is pushed by the high-temperature gas in the inner cavity of the outer shell 1. 0, thereby using the push block 10 to push the connecting rod 9 outward, and then pushing the sealing cover 8 connected to the connecting rod 9 out of the heat dissipation groove 6, so as to achieve the function of discharging the high-temperature gas in the outer shell 1, and a plurality of shock-absorbing springs 16 are fixedly connected to the outer side of the inner shell 3, and the shock-absorbing springs 16 are evenly distributed on the outer side of the inner shell 3 in a staggered shape. The shock-absorbing springs 16 are movably connected to the inner side of the outer shell 1, and the shock-absorbing springs 16 can absorb the impact force transmitted to the inner shell 3 to prevent the battery roll core 4 in the inner shell 3 from being damaged by the impact. At the same time, the shock-absorbing springs 16 can also play a heat dissipation role, and the heat in the inner shell 3 can be dispersed and transferred to the outer shell 1.

[0024] In summary, this cylindrical lithium-ion battery, according to Figure 1-Figure 4 , first, the inner shell 3 is fixedly installed on the inner side of the outer shell 1 through the sealing ring 2, and then the connected battery core 4 is placed in the inner shell 3, and then the positive separator 11 and the negative separator 13 are fixedly installed at the upper and lower ends of the inner side of the inner shell 3 respectively, and then the positive electrode component 12 of the battery is installed on the upper end of the inner shell 3, and the negative electrode component 14 of the battery is installed on the lower end of the inner shell 3. During the installation, the positive electrode sheet of the battery core 4 is connected to the positive electrode component 12, and the negative electrode sheet of the battery core 4 is connected to the negative electrode component 14. When a malfunction occurs during the use of the lithium-ion battery and the internal temperature is too high, the high-temperature gas generated by the battery core 4 will be discharged from the inner shell 3 through the heat dissipation holes 5 on the side of the inner shell 3 to reach the cavity between the outer shell 1 and the inner shell 3, and then the high-temperature gas will push the push block 10 outward, and then the sealing cover 8 will be pushed out of the heat dissipation groove 6 through the connecting rod 9 fixedly connected to the outside of the push block 10, so that the high-temperature gas is discharged from the cavity between the outer shell 1 and the inner shell 3 to achieve heat dissipation.

Claims

1. A cylindrical lithium-ion battery, characterized in that: The invention comprises an outer shell (1), wherein the upper and lower ends of the inner side of the outer shell (1) are fixedly connected with a sealing ring (2), the inner side of the sealing ring (2) is fixedly connected with an inner shell (3), three battery coil cores (4) are fixedly installed inside the inner shell (3), gaps are provided between the battery coil cores (4), a plurality of heat dissipation holes (5) are provided on the surface of the inner shell (3), the heat dissipation holes (5) are connected with the gaps between the battery coil cores (4), a heat dissipation groove (6) is provided inside the sealing ring (2), a plurality of holes (7) are provided at the bottom of the heat dissipation groove (6), the holes (7) are connected with the inner cavity of the outer shell (1), a sealing cover (8) is movably installed inside the heat dissipation groove (6), a plurality of connecting rods (9) are fixedly connected to the sealing cover (8) on one side close to the bottom of the heat dissipation groove (6), a push block (10) is fixedly connected to one end of the connecting rod (9), and the push block (10) is movably engaged with the inside of the hole (7).

2. A cylindrical lithium-ion battery according to claim 1, characterized in that: A positive electrode separator (11) is fixedly connected to the upper inner end of the inner shell (3), and a positive electrode component (12) is fixedly connected to the upper end of the positive electrode separator (11).

3. A cylindrical lithium-ion battery according to claim 1, characterized in that: A negative electrode separator (13) is fixedly connected to the lower inner end of the inner shell (3), and a negative electrode component (14) is fixedly connected to the lower end of the negative electrode separator (13).

4. A cylindrical lithium-ion battery according to claim 1, characterized in that: The upper and lower ends of the battery coil core (4) are fixedly connected with insulating partitions (15).

5. A cylindrical lithium-ion battery according to claim 1, characterized in that: A plurality of shock-absorbing spring sheets (16) are fixedly connected to the outer side of the inner shell (3); the shock-absorbing spring sheets (16) are evenly distributed on the outer side of the inner shell (3) in a staggered manner; and the shock-absorbing spring sheets (16) are movably connected to the inner side of the outer shell (1).

6. A cylindrical lithium-ion battery according to claim 1, characterized in that: A mesh protective layer (17) is provided inside the side wall of the outer shell (1).

7. A cylindrical lithium-ion battery according to claim 1, characterized in that: Outer protective sleeves (18) are fixedly mounted on both upper and lower ends of the outer shell (1).

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