Cylindrical battery with good sealing effect

Abstract

The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery with a good sealing effect, which comprises an inner core, a positive electrode sheath and a negative electrode sheath are arranged on a positive electrode and a negative electrode of the inner core respectively in a sleeving mode, the positive electrode sheath and the negative electrode sheath are located in the shell, and a second rolling part and a first rolling part corresponding to the first rib groove and the second rib groove are rolled on the shell respectively. A positive pole closing plate and a negative pole closing plate which are used for closing are arranged at the two ends of the shell and correspond to the positive pole and the negative pole of the inner core, a plastic extrusion part is fixedly connected to the lower portion of the positive pole column, a fourth welding part is formed between the positive pole closing plate and the upper bending part through welding, and a first welding part is formed between the negative pole closing plate and the lower bending part through welding; under the action of pressure, the positive pole extrudes the plastic extrusion part to deform in the positive sheath, and the liquid injection hole and the positive pole are welded and sealed, so that the effect of improving the sealing effect of the battery is achieved, and the use safety of the battery is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery with good sealing effect. Background Art

[0002] There are many types of batteries, among which there is a cylindrical battery classified by shape. Because of its small size and easy to carry, cylindrical batteries are also the type that people are most exposed to in daily life. During the production of cylindrical batteries, the electrodes are wound into battery cells, and then the battery cells are placed in a metal casing. The positive and negative electrode patches are then packaged at the ends of the battery, and the electrolyte is filled into the battery. In order to avoid accidents caused by electrolyte leakage during use, the battery needs to meet sealing standards during production.

[0003] Currently, cylindrical batteries are mainly packaged by providing a rolling groove at the opening of the shell, then opening a cover assembly in the rolling groove, and then bending the shell opening inward to tighten the cover assembly to achieve a sealing effect. However, batteries produced by this sealing method are prone to cracking when subjected to external force or bumps. Cracked charged batteries are prone to accidents, resulting in poor sealing effect and affecting the safety of battery use. Therefore, to address the above problems, a cylindrical battery with good sealing effect is proposed. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art and address the problems existing in the prior art, the utility model proposes a cylindrical battery with good sealing effect.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a cylindrical battery with good sealing effect, comprising an inner core; the positive and negative electrodes of the inner core are respectively sheathed with a positive electrode sheath and a negative electrode sheath, the inner core is sheathed with an outer shell, and the positive electrode sheath and the negative electrode sheath are located inside the outer shell, the side curved surfaces of the positive electrode sheath and the negative electrode sheath are respectively provided with a No. 1 rib groove and a No. 2 rib groove, and the outer shell is respectively rolled with a No. 2 rolling portion and a No. 1 rolling portion corresponding to the No. 1 rib groove and the No. 2 rib groove, and the outer shell is deformed by rolling the outer shell so as to limit the positive electrode sheath and the negative electrode sheath, and enable the positive electrode sheath and the negative electrode sheath to be maintained at the positive and negative electrodes of the inner core.

[0006] A positive electrode closing plate and a negative electrode closing plate for sealing are provided at both ends of the shell corresponding to the positive and negative electrodes of the inner core. An injection hole for liquid injection is provided on the positive electrode sheath. A positive electrode column is provided through the injection hole. A plastic extrusion part is fixed under the positive electrode column, and the arc-shaped protrusion can be deformed by extrusion and fix the positive electrode column in the injection hole. The injection hole is sealed by the positive electrode column to prevent the electrolyte in the battery from leaking through the injection hole under the action of external force.

[0007] Preferably, the upper end of the shell is bent inwardly by rolling to form an upper bending portion, and a No. 4 welding portion is formed between the positive electrode sealing plate and the upper bending portion by welding.

[0008] Preferably, a second welding portion is formed between the side curved surface of the positive electrode column and the liquid injection hole by welding, a through hole is opened through the positive electrode closing plate, and the positive electrode column is arranged in the through hole, and a third welding portion is formed between the side curved surface of the positive electrode column and the through hole by welding.

[0009] Preferably, the bottom end of the shell is bent inwardly by rolling to form a lower bent portion, and a No. 1 welding portion is formed between the negative electrode sealing plate and the lower bent portion by welding.

[0010] Preferably, the positive and negative ends of the inner core are respectively provided with a positive current collecting disc and a negative current collecting disc, and the positive current collecting disc and the negative current collecting disc are respectively located in the positive sheath and the negative sheath and fit tightly therewith. An interlocking groove is provided on the positive current collecting disc, and the positive current collecting disc and the negative current collecting disc are used to transmit the current of the inner core to ensure the normal use of the battery.

[0011] Preferably, an arc-shaped protrusion is provided on the bottom side of the plastic extrusion part, and the plastic extrusion part is a hollow structure. The plastic extrusion part will be deformed after being extruded and embedded in the embedding groove. The deformation of the plastic extrusion part is used to fix the positive electrode column in the injection hole and improve the sealing effect of the injection hole.

[0012] Preferably, the negative electrode sealing plate, the negative electrode sheath, the positive electrode sheath and the plastic extrusion part are all made of metal materials and have a certain electrical conductivity.

[0013] The utility model is beneficial in that:

[0014] The utility model arranges the outer shell on the outside of the inner core, and the outer shell is located on the outside of the positive electrode sheath and the negative electrode sheath, utilizes the No. 1 rolling part and the No. 2 rolling part to be respectively embedded in the No. 1 rolling part and the No. 2 rolling part, and the two ends of the outer shell are rolled to form an upper bending part and a lower bending part, and the negative electrode closing plate and the opening of the lower bending part are welded to form a No. 1 welding part, and the positive electrode column is penetrated and arranged in the injection hole. Under the action of pressure, the positive electrode column will extrude the plastic extrusion part to produce deformation in the positive electrode sheath, so that the positive electrode column is fixed and sealed in the injection hole, the injection hole and the positive electrode column are welded and sealed, the positive electrode closing plate is welded and sealed in the upper bending part, and the through hole and the positive electrode column are welded and sealed. The cooperation achieves the effect of improving the sealing effect of the battery, has better protection effect than the traditional battery structure, and effectively improves the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic diagram of a first three-dimensional structure;

[0017] Figure 2 It is an enlarged schematic diagram of the cross-section of the battery main structure;

[0018] Figure 3 This is an enlarged schematic diagram of area A in the cross-section diagram of the battery main structure;

[0019] Figure 4 This is an enlarged schematic diagram of area B in the cross-section diagram of the battery main structure;

[0020] Figure 5 This is an enlarged schematic diagram of the battery main structure after explosion;

[0021] Figure 6 This is an enlarged schematic diagram of area C in the cross-section diagram of the battery main structure after explosion.

[0022] In the figure: 1. inner core; 2. positive electrode current collecting disc; 3. interlocking groove; 4. negative electrode current collecting disc; 5. positive electrode sheath; 6. injection hole; 7. No. 1 rib groove; 8. negative electrode sheath; 9. No. 2 rib groove; 10. outer shell; 11. upper bending part; 12. lower bending part; 13. No. 1 rolling part; 14. No. 2 rolling part; 15. negative electrode closing plate; 16. No. 1 welding part; 17. positive electrode column; 18. plastic extrusion part; 19. arc-shaped protrusion; 20. No. 2 welding part; 21. positive electrode closing plate; 22. No. 3 welding part; 23. No. 4 welding part; 24. through hole. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-6 As shown, a cylindrical battery with good sealing effect includes an inner core 1; Figure 3 and Figure 4In the embodiment, the positive and negative electrodes of the inner core 1 are respectively provided with a positive electrode sheath 5 and a negative electrode sheath 8, the inner core 1 is provided with an outer shell 10, and the positive electrode sheath 5 and the negative electrode sheath 8 are located in the outer shell 10, and the side curved surfaces of the positive electrode sheath 5 and the negative electrode sheath 8 are respectively provided with a No. 1 rib groove 7 and a No. 2 rib groove 9, and the outer shell 10 is respectively rolled with a No. 2 rolling portion 14 and a No. 1 rolling portion 13 corresponding to the No. 1 rib groove 7 and the No. 2 rib groove 9. By rolling the outer shell 10, the outer shell 10 is deformed so as to limit the positive electrode sheath 5 and the negative electrode sheath 8, and the positive electrode sheath 5 and the negative electrode sheath 8 can be maintained at the positive and negative electrodes of the inner core 1.

[0025] like Figure 3-Figure 5 In the figure, the two ends of the shell 10 are provided with a positive electrode closing plate 21 and a negative electrode closing plate 15 for sealing, corresponding to the positive and negative poles of the inner core 1. The positive electrode sheath 5 is provided with an injection hole 6 for injection, and a positive electrode column 17 is provided through the injection hole 6. A plastic extrusion part 18 is fixedly connected to the bottom of the positive electrode column 17, and the arc-shaped protrusion 19 can be deformed by extrusion and fix the positive electrode column 17 in the injection hole 6. The positive electrode column 17 is used to seal the injection hole 6 to prevent the electrolyte in the battery from leaking into the injection hole 6 under the action of external force.

[0026] like Figure 3 In the embodiment, the upper end of the housing 10 is bent inwardly by rolling to form an upper bent portion 11 , and a No. 4 welding portion 23 is formed between the positive electrode sealing plate 21 and the upper bent portion 11 by welding.

[0027] A second welding portion 20 is formed between the side curved surface of the positive electrode column 17 and the liquid injection hole 6 by welding. A through hole 24 is penetrated through the positive electrode closing plate 21, and the positive electrode column 17 is arranged in the through hole 24. A third welding portion 22 is formed between the side curved surface of the positive electrode column 17 and the through hole 24 by welding.

[0028] like Figure 4 In the embodiment, the bottom end of the housing 10 is bent inwardly by rolling to form a lower bent portion 12 , and a first welding portion 16 is formed between the negative electrode sealing plate 15 and the lower bent portion 12 by welding.

[0029] like Figure 2 and Figure 5 In the figure, the positive and negative ends of the inner core 1 are respectively provided with a positive current collecting disc 2 and a negative current collecting disc 4, and the positive current collecting disc 2 and the negative current collecting disc 4 are respectively located in the positive sheath 5 and the negative sheath 8, and fit tightly therewith. An interlocking groove 3 is provided on the positive current collecting disc 2, and the positive current collecting disc 2 and the negative current collecting disc 4 are used to transmit the current of the inner core 1 to ensure the normal use of the battery.

[0030] like Figure 6In the figure, an arc-shaped protrusion 19 is provided on the bottom side of the plastic extrusion part 18, and the plastic extrusion part 18 is a hollow structure. The plastic extrusion part 18 will be deformed after being extruded and embedded in the embedding groove 3. The deformation of the plastic extrusion part 18 is used to fix the positive electrode column 17 in the injection hole 6 and improve the sealing effect of the injection hole 6.

[0031] The negative electrode sealing plate 15 , the negative electrode sheath 8 , the positive electrode sheath 5 and the plastic extrusion part 18 are all made of metal materials and have a certain electrical conductivity.

[0032] During operation, the existing cylindrical battery packaging is mainly achieved by setting a rolling groove at the opening of the shell, then opening the cover group in the rolling groove, and bending the shell opening inward to tighten the cover group to achieve a sealing effect. However, the battery produced by this sealing method is prone to cracking when squeezed by external force or bumped, and the cracking of the charged battery is likely to cause an accident, resulting in poor sealing effect and affecting the safety of the battery. In this solution, the positive electrode collector plate 2 and the negative electrode collector plate 4 are respectively placed in the openings of the positive electrode sheath 5 and the negative electrode sheath 8, and then the positive electrode sheath 5 and the negative electrode sheath 8 are respectively sleeved. On the positive and negative electrodes of the inner core 1, the outer shell 10 is then sleeved on the outside of the inner core 1, and the outer shell 10 is located on the outside of the positive electrode sheath 5 and the negative electrode sheath 8. The outer shell 10 is rolled to form a second rolling portion 14 and a first rolling portion 13. The first rolling portion 13 and the second rolling portion 14 are respectively embedded in the first rolling portion 13 and the second rolling portion 14 to fix the positive electrode sheath 5 and the negative electrode sheath 8. Subsequently, the two ends of the outer shell 10 are rolled to form an upper bending portion 11 and a lower bending portion 12, and the negative electrode closing plate 15 is welded to the opening of the lower bending portion 12 to form a The positive electrode column 17 is punched through the injection hole 6, and the plastic extrusion piece 18 is located inside the positive electrode sheath 5. The positive electrode column 17 is then punched. At this time, the positive electrode column 17 squeezes the plastic extrusion piece 18 under pressure to deform in the positive electrode sheath 5 and gradually flattens so that the positive electrode column 17 is fixed and sealed in the injection hole 6. The second welding portion 20 is then formed between the injection hole 6 and the positive electrode column 17 by welding, and the positive electrode closing plate 21 is pressed. By welding and sealing it in the upper bend portion 11, and finally welding and sealing the through hole 24 and the positive electrode column 17, the battery sealing effect is achieved. The positive electrode sheath 5 and the positive electrode closing plate 21 protect the positive electrode of the battery, the negative electrode sheath 8 and the negative electrode closing plate 15 protect the negative electrode of the battery, and the outer shell 10 protects the side of the battery. A gap is left between the inside of the outer shell 10 and the inner core 1, thereby improving the overall protection effect of the battery, and achieving the effect of improving the battery sealing effect. Compared with the traditional battery structure, the protection effect is better, and the safety of battery use is effectively improved.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A cylindrical battery with good sealing effect, characterized by: The invention comprises an inner core (1); the positive and negative electrodes of the inner core (1) are respectively sheathed with a positive electrode sheath (5) and a negative electrode sheath (8); the inner core (1) is covered with an outer shell (10), and the positive electrode sheath (5) and the negative electrode sheath (8) are located inside the outer shell (10); the side curved surfaces of the positive electrode sheath (5) and the negative electrode sheath (8) are respectively provided with a No. 1 rib groove (7) and a No. 2 rib groove (9); and the outer shell (10) is respectively rolled with a No. 2 rolling portion (14) and a No. 1 rolling portion (13) corresponding to the No. 1 rib groove (7) and the No. 2 rib groove (9); A positive electrode sealing plate (21) and a negative electrode sealing plate (15) for sealing are provided at both ends of the shell (10) corresponding to the positive and negative electrodes of the inner core (1); an injection hole (6) for injecting liquid is provided on the positive electrode sheath (5); a positive electrode column (17) is provided through the injection hole (6); a plastic extrusion piece (18) is fixedly connected to the bottom of the positive electrode column (17); and an arc-shaped protrusion (19) can be deformed by extrusion and fix the positive electrode column (17) in the injection hole (6).

2. A cylindrical battery with good sealing effect according to claim 1, characterized in that: The upper end of the shell (10) is bent inward by rolling to form an upper bending portion (11), and a No. 4 welding portion (23) is formed between the positive electrode sealing plate (21) and the upper bending portion (11) by welding.

3. A cylindrical battery with good sealing effect according to claim 1, characterized in that: A second welding portion (20) is formed between the side curved surface of the positive electrode column (17) and the liquid injection hole (6) by welding, a through hole (24) is provided through the positive electrode closing plate (21), and the positive electrode column (17) is arranged in the through hole (24), and a third welding portion (22) is formed between the side curved surface of the positive electrode column (17) and the through hole (24) by welding.

4. A cylindrical battery with good sealing effect according to claim 1, characterized in that: The bottom end of the shell (10) is bent inward by rolling to form a lower bending portion (12), and a No. 1 welding portion (16) is formed between the negative electrode sealing plate (15) and the lower bending portion (12) by welding.

5. The cylindrical battery with good sealing effect according to claim 1, characterized in that: The positive and negative ends of the inner core (1) are respectively provided with a positive current collecting disc (2) and a negative current collecting disc (4), and the positive current collecting disc (2) and the negative current collecting disc (4) are respectively located in the positive electrode sheath (5) and the negative electrode sheath (8) and are tightly fitted therewith, and an interlocking groove (3) is provided on the positive electrode collecting disc (2).

6. The cylindrical battery with good sealing effect according to claim 1, characterized in that: The bottom side of the plastic extrusion piece (18) is provided with an arc-shaped protrusion (19), and the plastic extrusion piece (18) is a hollow structure. The plastic extrusion piece (18) will be deformed after being extruded and will be embedded in the embedding groove (3).

7. The cylindrical battery with good sealing effect according to claim 1, characterized in that: The negative electrode sealing plate (15), the negative electrode sheath (8), the positive electrode sheath (5) and the plastic extrusion part (18) are all made of metal materials and have certain electrical conductivity.

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