Cylindrical battery structure

Abstract

The utility model provides a cylindrical battery structure, which comprises an upper cover, a first collector plate, a battery cell, a second collector plate and a shell, one end of the shell is provided with an opening, the upper cover covers the opening, the first collector plate and the second collector plate are respectively arranged at two ends of the battery cell, the battery cell is positioned in the shell, and the upper cover covers the upper cover. An annular table is arranged on the first flow collecting disc, the annular table abuts against the upper cover, and a first reserved cavity is defined by the first flow collecting disc and the upper cover; the second flow collecting disc is provided with supporting feet, the supporting feet abut against the inner wall of the other end of the shell, and a second reserved cavity is defined by the second flow collecting disc and the inner wall of the end of the shell. According to the utility model, the first reserved cavity and the second reserved cavity are arranged in the shell, so that the liquid injection coefficient of the battery is effectively improved, and sufficient electrolyte allowance in the later cycle period of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery structure technical field, concretely relates to a cylindrical battery structure. BACKGROUND

[0002] In the traditional battery structure, because the lithium ion battery and sodium ion battery structure process are similar, the factory will use the lithium ion battery shell structure for the sodium ion battery to reduce the cost, but with the iteration of the sodium ion battery material system, the sodium ion battery will appear the unsuitability of structure, such as the low liquid injection coefficient, the phenomenon of rapid attenuation of cycle performance due to the lack of electrolyte in the later stage of battery cycle, which seriously affects the battery performance. SUMMARY

[0003] The utility model discloses a cylindrical battery structure, which sets a first reserved cavity and a second reserved cavity in the shell, effectively improves the battery liquid injection coefficient and ensures sufficient electrolyte reserve in the later stage of battery cycle.

[0004] The utility model discloses a cylindrical battery structure, which sets a first reserved cavity and a second reserved cavity in the shell, effectively improves the battery liquid injection coefficient and ensures sufficient electrolyte reserve in the later stage of battery cycle.

[0005] The first through hole is arranged on the first current collector, and the first through hole is connected with the first reserved cavity and the battery cell.

[0006] The first pole is arranged on the upper cover, the second pole is arranged on the second current collector, the second pole is higher than the supporting leg, the shell end is provided with a pole hole, the second pole is located in the pole hole and is connected with the shell by welding.

[0007] The outer wall is arranged around the circumference of the upper cover, the outer wall is attached to the ring table and located outside the ring table, and the sealing ring is arranged between the outer wall and the shell.

[0008] The outer wall is arranged around the circumference of the upper cover, the outer wall is attached to the ring table and located outside the ring table, and the sealing ring is arranged between the outer wall and the shell.

[0009] The upper cover is provided with an insulating pad, the insulating pad cover is arranged on the upper cover, the outer wall and the supporting plate, and the sealing ring is located between the insulating pad and the shell.

[0010] The opening end of the shell is inwardly bent to form a curled edge, and the curled edge abuts above the sealing ring.

[0011] The outer side wall of the shell is provided with a sealing port, and the sealing port is provided with a safety valve.

[0012] The upper cover is provided with a liquid injection hole, the liquid injection hole is communicated with the first reserved cavity, the liquid injection hole is provided with a sealing glue particle, and the upper cover of the liquid injection hole is provided with a sealing aluminum sheet.

[0013] The cylindrical battery structure has the following beneficial effects:

[0014] 1. The ring table is arranged on the first current collecting disc, and the ring table abuts against the upper cover to form the first reserved cavity; the supporting leg is arranged on the second current collecting disc, and the supporting leg abuts against the end portion of the shell to form the second reserved cavity, the first reserved cavity and the second reserved cavity are communicated with the battery cell, the first reserved cavity and the second reserved cavity can increase the electrolyte, improve the battery liquid injection coefficient, and reserve space for gas production in the subsequent battery charging and discharging process, so that the internal pressure of the battery is prevented from being too large;

[0015] 2. The sealing port is arranged on the outer circular surface of the shell, and the safety valve is arranged in the sealing port, so that the installation cost of the safety valve is reduced;

[0016] 3. The opening end of the shell is curled to fix the sealing member, so that laser welding is avoided, welding quality risk is reduced, and production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated into and form part of the description, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, similar reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0018] Figure 1 The explosion view of the embodiment of the present application.

[0019] Figure 2 The cooperation schematic view of the upper cover and the first current collecting disc of the embodiment of the present application.

[0020] Figure 3 It is the cooperation schematic view of the second current collecting disc and the shell of the utility model embodiment.

[0021] Figure 4 It is the structure view of the first current collecting disc of the utility model embodiment.

[0022] Figure 5 It is the structure view of the second current collecting disc of the utility model embodiment.

[0023] In the drawing: 10, electric core;101, first reserved cavity;102, second reserved cavity;20, shell;201, pole hole;202, sealing mouth;21, curling edge;30, first current collecting disc;301, ring table;302, first through hole;40, second current collecting disc;401, second pole;402, support foot;403, second through hole;50, upper cover;501, first pole;502, outer wall;503, supporting plate;51, insulating pad;52, sealing ring;53, sealing glue particle;54, sealing aluminum sheet. Specific implementation

[0024] In order to make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model. It should be noted that, in the case of no conflict, the embodiment in the application and the features in the embodiment can be combined with each other at will.

[0025] Please refer to Figures 1 to 5 A cylindrical battery structure, including upper cover 50, first current collecting disc 30, electric core 10, second current collecting disc 40 and shell 20, one end of shell 20 is provided as opening, first current collecting disc 30 and second current collecting disc 40 are arranged at both ends of electric core 10 respectively, electric core 10 is arranged in shell 20, upper cover 50 is covered at the opening of shell 20, ring table 301 is arranged on first current collecting disc 30, ring table 301 abuts with upper shell, to form first reserved cavity 101 between first current collecting disc 30 and upper shell;Support foot 402 is arranged on second current collecting disc 40, support foot 402 abuts with the inner wall of the other end of shell 20, to form second reserved cavity 102 between second current collecting disc 40 and the end of shell 20. First reserved cavity 101 and second reserved cavity 102 can increase the space at both ends of electric core 10, to accommodate more electrolyte, improve the battery liquid injection coefficient, ensure that there is sufficient electrolyte in the later stage of battery cycle, at the same time, first reserved cavity 101 and second reserved cavity 102 can reserve space for gas production in the process of battery cycle discharge, to prevent the internal pressure of battery from being too large.

[0026] The shell 20 is cylindrical, one end of which is provided with an opening, and the battery cell 10 is installed in the shell 20 through the opening, and the upper cover 50 is covered on the opening to seal the shell 20.

[0027] The first current collector plate 30 is plate-shaped, one end surface of which is placed at the end of the battery cell 10, and the other end surface of which is provided with a ring table 301 protruding from the end surface of the first current collector plate 30. When the upper cover 50 is covered on the shell 20, the ring table 301 abuts against the upper cover 50 to provide positioning for the upper end of the battery cell 10. The ring table 301 is taken as a side wall, the first current collector plate 30 and the upper cover 50 are taken as upper and lower bottoms respectively, and a first reserved cavity 101 is formed therearound. A plurality of first through holes 302 are provided on the first current collector plate 30, and the first through holes 302 are communicated with the battery cell 10 to provide flow channels for the electrolyte.

[0028] The second current collector plate 40 is plate-shaped, one end surface of which is in contact with the battery cell 10, and the other end surface of which is provided with a support leg 402 protruding from the end surface of the second current collector plate 40. The second current collector plate 40 is erected in the shell 20 through the support leg 402, and the battery cell 10 is placed on the second current collector plate 40, and the lower end of the battery cell 10 is positioned by the second current collector plate 40. The inner wall of the shell 20 is taken as a side wall, the second current collector plate 40 and the bottom shell end are taken as upper and lower bottoms respectively, and a second reserved cavity 102 is formed therearound. A plurality of second through holes 403 are provided on the second current collector plate 40, and the second through holes 403 are communicated with the battery cell 10 to provide flow channels for the electrolyte.

[0029] The first current collector plate 30 abuts against the upper cover 50 through the ring table 301, and the other end thereof abuts against the upper end of the battery cell 10. The second current collector plate 40 abuts against the bottom of the shell 20 through the support leg 402, and the other end thereof abuts against the lower end of the battery cell 10. In the axial direction, the first current collector plate 30 and the second current collector plate 40 are respectively positioned at the two ends of the battery cell 10 to provide support for the battery cell 10, thereby preventing the battery cell 10 from moving in the shell 20. The first reserved cavity 101 and the second reserved cavity 102 are both located in the shell 20, and respectively form extension spaces at the two ends of the battery cell 10 to accommodate more electrolyte, thereby improving the electrolyte injection coefficient of the battery. In actual use, when the electrolyte in the battery cell 10 decreases, the electrolyte in the first reserved cavity 101 and the electrolyte in the second reserved cavity 102 respectively seep into the battery cell 10 through the first through holes 302 and the second through holes 403 by the siphon phenomenon to supplement the electrolyte, thereby maintaining the battery circulation. At the same time, the first reserved cavity 101 and the second reserved cavity 102 reserve space for the gas generated in the subsequent battery circulation process, thereby avoiding excessive internal pressure of the battery.

[0030] The first pole column 501 is arranged on the upper cover 50, and an outer wall 502 is arranged on the end face of the first current collecting disc 30. The outer wall 502 is annular and circumferentially arranged around the upper cover 50. When the upper cover 50 is covered on the shell 20, the annular table 301 abuts against the upper cover 50, and the outer wall 502 is located outside the annular table 301. The outer wall 502 and the annular table 301 are fixed by ultrasonic welding. Preferably, when the upper cover 50 is covered on the shell 20, the outer wall 502 and the annular table 301 are in interference fit, so as to stabilize the relative position of the outer wall 502 between the annular table 301, and facilitate subsequent welding and fixing.

[0031] The outer wall 502 is provided with a supporting plate 503 on the end face facing the shell 20. The supporting plate 503 is annular and arranged around the bottom of the outer wall 502. The sealing ring 52 is sleeved on the outer wall 502 and clamped between the inner wall of the shell 20 and the outer wall 502, so as to seal the upper cover 50 and the shell 20 and increase the connection sealing property of the upper cover 50 and the shell 20. The sealing ring 52 is located above the supporting plate 503, and the supporting plate 503 forms a stop below the sealing ring 52 to limit the sealing ring 52. Further, the upper cover 50, the outer wall 502 and the supporting plate 503 are provided with an insulating pad 51. The sealing ring 52 is arranged on the insulating pad 51, and the sealing ring 52 is clamped between the insulating pad 51 and the shell 20.

[0032] In the present application, the opening of the shell 20 is inwardly bent to form a curled edge 21. The curled edge 21 abuts above the sealing ring 52 to form a limit above the sealing ring 52, fix the sealing ring 52, and at the same time, press down the upper cover 50 to fix the upper cover 50 and the first current collecting disc 30 above the battery cell 10, complete the battery assembly, avoid using welding fixation, and reduce the influence of poor welding quality on the quality of the battery.

[0033] The upper cover 50 is provided with a liquid injection hole, and the liquid injection hole is communicated with the first reserved cavity 101. During installation, the liquid injection hole is provided with a sealing glue particle 53, and the upper cover 50 of the liquid injection hole is provided with a sealing aluminum sheet 54 to seal the liquid injection hole.

[0034] The second pole column 401 is arranged on the second current collecting disc 40, and the shell 20 is provided with a pole column hole 201. The second pole column 401 is inserted into the pole column hole 201. The height of the second pole column 401 is greater than the height of the supporting leg 402. When the supporting leg 402 abuts against the inner wall of the bottom of the shell, the second pole column 401 is located outside the shell 20, facilitating external connection of the battery, and the second pole column 401 and the shell 20 are fixed and sealed by laser welding.

[0035] In the application, the sealing port 202 is formed by parallel cutting on the outer circumferential surface of the shell 20, and the safety valve is arranged on the sealing port 202 to release pressure when the pressure in the battery increases. In the conventional battery structure, the safety valve is arranged on the cover plate, and the cover plate needs to be punched to install the safety valve. In the application, the sealing port 202 is formed by turning the shell 20, which simplifies the operation process and reduces the installation cost of the safety valve.

[0036] The installation process of the cylindrical battery structure of the application is as follows: first, the safety valve is installed on the sealing port 202 of the shell 20; then, the first current collector 30 and the second current collector 40 are respectively welded with the tab at both ends of the battery cell 10, so that the annular table 301 is kept upward and the supporting leg 402 is kept downward; the upper cover 50 is heated, so that the inner diameter of the outer wall 502 is heated to increase, then the annular table 301 is inserted into the outer wall 502, so that the annular table 301 abuts against the upper cover 50, the cooled upper cover 50 is in interference fit with the annular table 301, and the outer wall 502 and the annular table 301 are fixed by ultrasonic welding; then, the battery cell 10 is inserted into the shell 20, and the second pole 401 is aligned with the pole hole 201, so that the second pole 401 is inserted into the pole hole 201; the insulating pad 51 and the sealing ring 52 are installed on the upper cover 50 in sequence, and the pressing rib 21 of the opening of the shell 20 is crimped to abut against the sealing ring 52 to seal the upper cover 50; the second pole 401 and the shell 20 are laser welded to complete the sealing of the battery; finally, electrolyte is injected into the shell 20 through the injection hole, then the sealing glue particles 53 are inserted into the injection hole, the sealing aluminum sheet 54 is placed on the injection hole and is welded and fixed to complete the assembly of the battery.

[0037] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them. Although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A cylindrical battery structure, characterized by, The application relates to a battery, which comprises an upper cover (50), a first current collector (30), a battery core (10), a second current collector (40) and a shell (20), one end of the shell (20) is provided with an opening, the upper cover (50) is arranged at the opening, the first current collector (30) and the second current collector (40) are arranged at two ends of the battery core (10) respectively, the battery core (10) is arranged in the shell (20), a ring table (301) is arranged on the first current collector (30) and abuts against the upper cover (50), and the first current collector (30) and the upper cover (50) surround to form a first reserved cavity (101); a supporting leg (402) is arranged on the second current collector (40) and abuts against the inner wall of the other end of the shell (20), and the second current collector (40) and the end inner wall of the shell (20) surround to form a second reserved cavity (102).

2. The cylindrical battery structure of claim 1, wherein, A first through hole (302) is arranged on the first current collector (30) and connects the battery core (10) and the first reserved cavity (101), and a second through hole (403) is arranged on the second current collector (40) and connects the battery core (10) and the second reserved cavity (102).

3. The cylindrical battery structure of claim 1, wherein, A first pole (501) is arranged on the upper cover (50), a second pole (401) is arranged on the second current collector (40), the second pole (401) is higher than the supporting leg (402), a pole hole (201) is formed in the end of the shell (20), the second pole (401) is located in the pole hole (201) and is welded with the shell (20).

4. The cylindrical battery structure of claim 1, wherein, An outer wall (502) is arranged on the upper cover (50) in a circumferential direction, the outer wall (502) is attached to the ring table (301) and located outside the ring table (301), and a sealing ring (52) is arranged between the outer wall (502) and the shell (20).

5. The cylindrical battery structure of claim 4, wherein, A ring-shaped supporting plate (503) is arranged at the bottom of the outer wall (502) and faces the shell (20), and the sealing ring (52) is located on the supporting plate (503).

6. The cylindrical battery structure of claim 5, wherein, An insulating pad (51) is arranged on the upper cover (50), the sealing ring (52) is located between the insulating pad (51) and the shell (20), and the insulating pad (51) is arranged on the upper cover (50), the outer wall (502) and the supporting plate (503).

7. The cylindrical battery structure of claim 5, wherein, The opening end of the shell (20) is inwardly bent to form a curled edge (21), and the curled edge (21) abuts above the sealing ring (52).

8. The cylindrical battery structure of claim 1, wherein, A sealing opening (202) is formed in the outer side wall of the shell (20), and a safety valve is arranged at the sealing opening (202).

9. The cylindrical battery structure of claim 1, wherein, An injection hole is formed in the upper cover (50) and communicates with the first reserved cavity (101), a sealing glue particle (53) is arranged in the injection hole, and a sealing aluminum sheet (54) is arranged on the injection hole.

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