Cylindrical battery with positive electrode and negative electrode at one end

Abstract

The utility model relates to a cylindrical battery with a positive electrode and a negative electrode at one end, which comprises a negative electrode collector plate, a positive electrode collector plate, a negative electrode lug, a positive electrode lug, a naked battery cell and an insulating rubber sleeve, the negative pole lug and the positive pole lug are arranged at the same end of the naked battery cell, the negative pole current collecting plate is welded with the negative pole lug, and the positive pole current collecting plate is welded with the positive pole lug; the insulating rubber sleeve is arranged at the end part of the bare battery cell in a sleeving manner, a negative current collector plate limiting groove and a positive current collector plate limiting groove are formed in the insulating rubber sleeve, an insulating blocking rib is arranged between the negative current collector plate limiting groove and the positive current collector plate limiting groove, the negative current collector plate is positioned in the negative current collector plate limiting groove, and the positive current collector plate is positioned in the positive current collector plate limiting groove. And the positive current collecting plate is positioned in the positive current collecting plate limiting groove.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion batteries, and particularly relates to a cylindrical battery with positive and negative electrodes located at one end. Background Art

[0002] Lithium - ion batteries are a widely used rechargeable battery technology, with high energy density, long cycle life, low self - discharge rate and low operation and maintenance costs, and have been widely used in fields such as electronic products, electric vehicles and aerospace.

[0003] Cylindrical batteries are the most common lithium - ion batteries. A typical cylindrical battery structure includes: positive electrode, negative electrode, separator and outer shell, etc. Usually, the insulation between the positive and negative electrodes of a cylindrical battery is achieved by leading out from both ends. The conventional method is: leading out the positive and negative electrodes of the cylindrical battery through both ends of the cylindrical battery, and then setting an intermediate insulator to achieve insulation between the positive and negative electrodes of the cylindrical battery. However, in the existing methods of insulating the positive and negative electrodes of cylindrical batteries, the positive and negative current collectors will greatly occupy the internal space at both ends of the cylindrical battery, and significantly reduce the overall space utilization rate inside the cylindrical battery, thereby greatly reducing the capacity of the cylindrical battery. At the same time, it will also make the electron transfer path between the positive and negative electrodes of the cylindrical battery very long, greatly increasing the internal resistance during the battery output process, and reducing the output power of the cylindrical battery. Summary of the Utility Model

[0004] In view of the above - mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a cylindrical battery with positive and negative electrodes located at one end, which can enable electrons to flow at one end of the cylindrical battery, effectively reduce the electron transmission path, thereby reducing the internal resistance during the battery output process, saving the internal space of the cylindrical battery, reducing the weight of structural parts, improving the overall energy density of the battery, and reducing the production cost of structural parts.

[0005] To achieve the above object, the utility model provides a cylindrical battery with positive and negative electrodes located at one end, including a negative current collector, a positive current collector, a negative electrode tab, a positive electrode tab and a bare cell, and further including an insulating rubber sleeve; both the negative electrode tab and the positive electrode tab are arranged at the same end of the bare cell, the negative current collector is welded to the negative electrode tab, and the positive current collector is welded to the positive electrode tab; the insulating rubber sleeve is sleeved on the end of the bare cell, and the insulating rubber sleeve is provided with a negative current collector limiting groove and a positive current collector limiting groove, and there is an insulating blocking rib between the negative current collector limiting groove and the positive current collector limiting groove. The negative current collector is located in the negative current collector limiting groove, and the positive current collector is located in the positive current collector limiting groove.

[0006] Furthermore, it further includes a terminal post and a top cover. The terminal post is arranged on the top cover, and the top cover is pressed tightly on the insulating rubber sleeve. A sector-shaped pit and a top cover hole are formed on the top cover. The sector-shaped pit is welded to the negative current collector plate, and the terminal post is welded to the positive current collector plate through the top cover hole.

[0007] Furthermore, it further includes an outer steel shell. The bare battery cell is located in the outer steel shell, and the outer steel shell is fixedly welded to the top cover.

[0008] Furthermore, an inner hole is formed in the terminal post, and it further includes an inner sealing assembly for the terminal post. The inner sealing assembly for the terminal post includes a sealing cover and a sealing rubber nail. The sealing rubber nail is arranged at the welding position between the positive current collector plate and the terminal post, and the sealing cover is fixedly arranged in the inner hole of the terminal post and presses tightly on the sealing rubber nail.

[0009] Furthermore, it further includes a bottom cover, and the bottom cover is arranged at one end of the bare battery cell away from the insulating rubber sleeve.

[0010] Furthermore, the insulating rubber sleeve is made of natural rubber.

[0011] As described above, the cylindrical battery with the positive and negative electrodes located at one end involved in the present utility model has the following beneficial effects:

[0012] 1. By arranging an insulating rubber sleeve between the positive current collector plate and the negative current collector plate to separate the positive current collector plate and the negative current collector plate, the stability of installation and isolation is ensured, the space inside the cylindrical battery can be effectively saved, the weight of structural components can be reduced, thereby improving the overall energy density of the battery and reducing the production cost of structural components.

[0013] 2. By arranging the positive current collector plate and the negative current collector plate at one end, the electrons flow at one end of the outer steel shell, which can effectively reduce the electron transmission path, thereby reducing the internal resistance during the battery output process and improving the service efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural view of the cylindrical battery with the positive and negative electrodes located at one end in the present utility model.

[0015] Figure 2 It is a schematic structural view of the inner surface of the insulating rubber sleeve in the present utility model.

[0016] Figure 3 It is a schematic structural view of the outer surface of the insulating rubber sleeve in the present utility model.

[0017] Figure 4 It is a schematic structural view of the top cover and the terminal post in the present utility model.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS

[0019] 1 Inner sealing assembly for the terminal post

[0020] 101 Sealing cover

[0021] 102 Sealing adhesive nail

[0022] 2 Terminal post

[0023] 3 Top cover

[0024] 301 Sector-shaped pit

[0025] 302 Top cover hole

[0026] 4 Insulating rubber sleeve

[0027] 401 Negative current collector plate limit groove

[0028] 402 Insulating blocking rib

[0029] 403 Positive current collector plate limit groove

[0030] 404 Negative connection through hole

[0031] 405 Positive connection through hole

[0032] 5 Negative current collector plate

[0033] 6 Positive current collector plate

[0034] 7 Negative terminal tab

[0035] 8 Positive terminal tab

[0036] 9 Bare battery cell

[0037] 10 Outer steel shell

[0038] 11 Bottom cover Detailed implementation manners

[0039] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0040] It should be noted that the structures, ratios, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the ratio relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0041] See Figures 1 to 3 , the present utility model provides a cylindrical battery with positive and negative electrodes located at one end, including a negative current collector plate 5, a positive current collector plate 6, a negative electrode tab 7, a positive electrode tab 8, and a bare battery cell 9, and further including an insulating rubber sleeve 4; both the negative electrode tab 7 and the positive electrode tab 8 are arranged at the same end of the bare battery cell 9, and preferably, the negative electrode tab 7 and the positive electrode tab 8 are respectively arranged in two non-adjacent fan-shaped areas on the end face of the bare battery cell 9. The bottom of the negative current collector plate 5 is welded to the negative electrode tab 7, and the bottom of the positive current collector plate 6 is welded to the positive electrode tab 8; the insulating rubber sleeve 4 is sleeved on the end of the bare battery cell 9. The insulating rubber sleeve 4 is provided with a negative current collector plate limiting groove 401 and a positive current collector plate limiting groove 403. A negative connection through hole 404 is opened on the negative current collector plate limiting groove 401, and a positive connection through hole 405 is opened on the positive current collector plate limiting groove 403. And there is an insulating blocking rib 402 between the negative current collector plate limiting groove 401 and the positive current collector plate limiting groove 403. The negative current collector plate 5 is located in the negative current collector plate limiting groove 401 and is connected to the upper structure through the negative connection through hole 404. The positive current collector plate 6 is located in the positive current collector plate limiting groove 403 and is connected to the upper structure through the positive connection through hole 405.

[0042] The basic working principle of the cylindrical battery with the positive and negative electrodes located at one end involved in the present utility model is as follows: First, both the negative electrode tab 7 and the positive electrode tab 8 are arranged at the same end of the bare battery cell 9. Then, the bottom of the positive current collector plate 6 is welded to the positive electrode tab 8. After the negative current collector plate 5 is properly placed, the bottom of the negative current collector plate 5 is welded to the negative electrode tab 7. After that, an insulating rubber sleeve 4 is pressed on the negative current collector plate 5 and the positive current collector plate 6, so that the negative current collector plate 5 is located in the negative current collector plate limiting groove 401 of the insulating rubber sleeve 4, and the positive current collector plate 6 is located in the positive current collector plate limiting groove 403 of the insulating rubber sleeve 4. There is an insulating blocking rib 402 between the negative current collector plate limiting groove 401 and the positive current collector plate limiting groove 403, which can insulate the positive and negative electrodes. Finally, in the whole structure, both the positive and negative electrodes are arranged at the same end of the cylindrical battery, which can effectively save the internal space of the cylindrical battery, enable electrons to flow at one end of the cylindrical battery, effectively reduce the electron transmission path, improve the overall energy density of the cylindrical battery, and reduce the production cost of the structural parts.

[0043] See Figures 1 to 4 , the following further illustrates the present utility model with a specific embodiment:

[0044] In this embodiment, see Figure 1 and Figure 4 , as a preferred design, it further includes a terminal post 2 and a top cover 3. The terminal post is arranged on the top cover 3, and the top cover 3 presses on the insulating rubber sleeve 4, which can strengthen the fixing effect of the insulating rubber sleeve 4 wrapped on the bare battery cell 9. A fan-shaped concave pit 301 and a top cover hole 302 are opened on the top cover 3. The fan-shaped concave pit 301 is welded to the negative current collector plate 5 through a negative connection through hole 404, which can further fix the position of the negative current collector plate 5. The terminal post 2 is welded to the positive current collector plate 6 through the top cover hole 302 and a positive connection through hole 405, which can further fix the position of the positive current collector plate 6 and also strengthen the current conduction effect.

[0045] In this embodiment, see Figure 1 , as a preferred design, it further includes an outer steel shell 10. The bare battery cell 9 is located in the outer steel shell 10, and the outer steel shell 10 is welded and fixed to the top cover 3, which can improve the stability and safety of the cylindrical battery structure.

[0046] In this embodiment, see Figure 1 , as a preferred design, the terminal post 2 has an inner hole, which is convenient for welding the terminal post 2 to the positive current collector plate 6. It further includes a terminal post inner sealing assembly 1. The terminal post inner sealing assembly 1 includes a sealing cover 101 and a sealing rubber nail 102. The sealing rubber nail 102 is arranged at the welding joint of the positive current collector plate 6 and the terminal post 2. The sealing cover 1 is fixedly arranged in the inner hole of the terminal post 2 and presses the sealing rubber nail 102. The terminal post inner sealing assembly 101 can seal the cylindrical battery and prevent the alkali solution from leaking and penetrating outward.

[0047] In this embodiment, referring to Figure 1 , as a preferred design, it further includes a bottom cover 11. The bottom cover 11 is arranged at one end of the bare battery cell 9 away from the insulating rubber sleeve 4, and can protect the bottom of the cylindrical battery from damage in the external environment, such as water and dust.

[0048] In this embodiment, referring to Figure 2 and Figure 3 , as a preferred design, the insulating rubber sleeve 4 is made of natural rubber, which has good elasticity, high strength, good insulation, small deformation during use, and is convenient for processing.

[0049] As can be seen from the above, the cylindrical battery with the positive and negative electrodes located at one end of the present utility model has the following beneficial effects:

[0050] 1. By arranging an insulating rubber sleeve between the positive current collector plate and the negative current collector plate to separate the positive current collector plate and the negative current collector plate, the stability of installation and isolation is ensured, the space inside the cylindrical battery can be effectively saved, the weight of the structural parts can be reduced, thereby improving the overall energy density of the battery and reducing the production cost of the structural parts.

[0051] 2. By arranging the positive current collector plate and the negative current collector plate at one end, the electrons flow at one end of the outer steel shell, which can effectively reduce the electron transmission path, and further reduce the internal resistance during the battery output process, improving the battery usage efficiency.

[0052] In summary, the present utility model effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0053] The above embodiments merely illustrate the principles and effects of the present utility model, rather than limiting the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A cylindrical battery with positive and negative electrodes located at one end, comprising a negative current collector plate (5), a positive current collector plate (6), a negative tab (7), a positive tab (8) and a bare battery cell (9), characterized in that: It further includes an insulating rubber sleeve (4); the negative electrode tab (7) and the positive electrode tab (8) are both arranged at the same end of the bare battery cell (9), the negative current collector plate (5) is welded to the negative electrode tab (7), and the positive current collector plate (6) is welded to the positive electrode tab (8); the insulating rubber sleeve (4) is sleeved on the end of the bare battery cell (9), and a negative current collector plate limiting groove (401) and a positive current collector plate limiting groove (403) are provided in the insulating rubber sleeve (4), and there is an insulating blocking rib (402) between the negative current collector plate limiting groove (401) and the positive current collector plate limiting groove (403), the negative current collector plate (5) is located in the negative current collector plate limiting groove (401), and the positive current collector plate (6) is located in the positive current collector plate limiting groove (403).

2. The cylindrical battery with the positive and negative electrodes located at one end according to claim 1, wherein: It further includes a terminal post (2) and a top cover (3), the terminal post (2) is arranged on the top cover (3), the top cover (3) is pressed on the insulating rubber sleeve (4), a fan-shaped concave pit (301) and a top cover hole (302) are provided on the top cover (3), the fan-shaped concave pit (301) is welded to the negative current collector plate (5), and the terminal post (2) is welded to the positive current collector plate (6) through the top cover hole (302).

3. The cylindrical battery with the positive and negative electrodes located at one end according to claim 2, characterized in that: It further includes an outer steel shell (10), the bare battery cell (9) is located in the outer steel shell (10), and the outer steel shell (10) is welded and fixed to the top cover (3).

4. The cylindrical battery with the positive and negative electrodes located at one end according to claim 2 or 3, characterized in that: There is an inner hole in the terminal post (2), and it further includes an inner sealing assembly (1) for the terminal post, the inner sealing assembly (1) for the terminal post includes a sealing cover (101) and a sealing rubber nail (102), the sealing rubber nail (102) is arranged at the welding joint of the positive current collector plate (6) and the terminal post (2), and the sealing cover (101) is fixedly arranged in the inner hole of the terminal post (2) and presses the sealing rubber nail (102).

5. The cylindrical battery with the positive and negative electrodes located at one end according to claim 1, characterized in that: It further includes a bottom cover (11), and the bottom cover (11) is arranged at one end of the bare battery cell (9) away from the insulating rubber sleeve (4).

6. The cylindrical battery with the positive and negative electrodes located at one end according to claim 1, characterized in that: The insulating rubber sleeve (4) is made of natural rubber.

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