Cylindrical battery shell and single battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cylindrical battery shell and a single battery, the shell comprises a shell body, a liquid injection hole and a plurality of welding parts are distributed at the bottom of the shell body, and an anti-explosion valve is arranged on the liquid injection hole; the explosion-proof valve and the liquid injection hole are designed in the same area at the bottom of the shell body, so that the product structure is simplified, and the production cost is reduced; the explosion-proof valve is designed at the bottom of the shell body, so that a shielding object is prevented from stopping pressure relief, the quick pressure relief capability is improved, the safety of the single battery is improved, the welding part and the bottom of the shell body are integrally formed, the shell body can be directly welded with a battery cell or a lower busbar, and the structure of the single battery is further simplified.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery structures, and particularly relates to a cylindrical battery case and a single cell battery. Background Art

[0002] Cylindrical batteries are widely used in energy storage devices, electric vehicles and other fields due to their advantages such as stable structure and high energy density. The bottom of the traditional cylindrical battery case is usually only provided with welding positions, while the positions for explosion prevention and liquid injection are designed on the cover plate. The traditional design has the following problems: 1. The explosion-proof valve designed separately on the cover plate will be blocked by the busbar inside the battery pack when it is opened, resulting in blocked pressure relief. When the internal pressure of the battery rises abnormally, it lacks the ability of rapid pressure relief, posing a safety hazard. 2. The liquid injection hole is designed on the cover plate, resulting in a complex cover plate structure and high cost. Therefore, a battery structure with low cost and high safety is needed. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a cylindrical battery case and a single cell battery, optimize the structural design of the single cell battery, and reduce the production cost.

[0004] A cylindrical battery case includes a case body. The bottom of the case body is provided with a liquid injection hole and a plurality of welding parts. The welding parts are grooves formed by the depression of the bottom plane of the case body towards the inside of the case. An explosion-proof valve is arranged on the liquid injection hole. The liquid injection hole is arranged at the central position of the bottom of the case body, and the welding parts are distributed in a circle around the liquid injection hole. The explosion-proof valve includes an explosion-proof sheet, and the thickness of the explosion-proof sheet is less than the thickness of the case body. The explosion-proof sheet is fixedly connected in the liquid injection hole, and a dust-proof sticker is fixedly connected at the connection between the explosion-proof sheet and the liquid injection hole to reduce dust pollution.

[0005] The thickness of the groove is less than the thickness of the bottom of the case body, which can reduce the welding power and improve the welding yield.

[0006] In order to improve the explosion-proof effect, the explosion-proof sheet is provided with a notch.

[0007] In some embodiments, the case body is a cavity structure with one end open. A cover plate is fixedly connected to the open end of the case body. A pole hole is opened at the central position of the cover plate, and a pole assembly is fixedly connected in the pole hole. The pole assembly includes a pole body and an insulating member. The pole body is fixedly connected in the pole hole, and the insulating member is fixedly connected between the pole body and the pole hole. A busbar is fixedly connected to the bottom of the pole body, and the busbar is welded to the upper side tab of the battery cell. An explosion-proof hole is opened on the cover plate, and an explosion-proof valve is fixedly connected in the explosion-proof hole. The top explosion-proof valve and the bottom explosion-proof valve form a double explosion-proof structure to further improve safety.

[0008] A single cell includes the housing body described in the above document.

[0009] Advantages of the present utility model: The explosion-proof valve and the liquid injection hole are designed in the same area at the bottom of the housing body of the present utility model, which simplifies the product structure and reduces the production cost; One of the explosion-proof valves designed at the bottom of the housing body avoids the blockage of pressure relief caused by debris or the shielding formed by the deformation of the housing after the explosion-proof valve is opened, improves the rapid pressure relief ability, and improves the safety of the single cell. The welding part of the present utility model is integrally formed with the bottom of the housing body, and the housing body can be directly welded to the battery cell or the lower busbar, further simplifying the structure of the single cell. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the present utility model;

[0011] Figure 2 is a top view structural diagram of the present utility model;

[0012] Figure 3 is a bottom view structural diagram of the present utility model;

[0013] Figure 4 is the Figure 2 A-A sectional view of the present utility model;

[0014] Figure 5 is the Figure 4 enlarged view at B of the present utility model;

[0015] Figure 6 is the Figure 4 enlarged view at C of the present utility model;

[0016] Figure 7 is a schematic structural diagram of the bottom of the housing body in Embodiment 2 of the present utility model.

[0017] In the figure: 1. Housing body; 11. Liquid injection hole; 111. Explosion-proof valve; 1111. Scratch; 112. Dust-proof sticker; 13. Welding part; 2. Cover plate; 21. Pole hole; 22. Pole assembly; 221. Pole body; 222. Insulating part; 223. Busbar; 23. Explosion-proof hole; 3. Battery cell; 31. Central hole. Detailed Embodiments

[0018] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. The connection described can be a direct connection or an indirect connection.

[0021] Embodiment 1

[0022] As Figures 1-6 shown:

[0023] A cylindrical battery case includes a case body 1. The case body 1 is a cavity structure with one end open for accommodating an electric core 3. Liquid injection holes 11 and several welding parts 13 are distributed at the bottom of the case body 1. The liquid injection holes 11 are used to inject electrolyte into the interior of the case body 1, and the welding parts 13 are used to weld the bottom surface of the case body 1 to the electrode tabs inside the case body 1 or the lower bus bar inside the case body 1. An explosion-proof valve 111 is provided on the liquid injection hole 11 for pressure relief and explosion prevention.

[0024] The case body 1 is a cavity structure with one end open. A cover plate 2 is fixedly connected to the open end of the case body 1. A pole hole 21 is opened at the center of the cover plate 2, and a pole assembly 22 is fixedly connected in the pole hole 21. The pole assembly 22 includes a pole body 221 and an insulating member 222. The pole body 221 is fixedly connected in the pole hole 21, and the insulating member 222 is fixedly connected between the pole body 221 and the pole hole 21. A bus bar 223 is fixedly connected to the bottom of the pole body 221, and the bus bar 223 is welded to the upper electrode tab of the electric core 3. An explosion-proof hole 23 is opened on the cover plate 2, and an explosion-proof valve 111 is fixedly connected in the explosion-proof hole 23. The explosion-proof valve 111 on the cover plate 2 has the same structure as the explosion-proof valve 111 on the above-mentioned case body 1, achieving the effect of double explosion prevention and further improving the safety of the single battery.

[0025] In this embodiment, the explosion-proof valve 111 is an explosion-proof sheet. The explosion-proof sheet is fixedly connected in the liquid injection hole 11, and the thickness of the explosion-proof sheet is less than the thickness of the case body 1, or the explosion-proof sheet is the weakest part under pressure in the entire single battery. When the pressure inside the single battery is too high, the explosion-proof sheet breaks to achieve pressure relief and explosion prevention.

[0026] In order to better achieve the liquid injection and welding effects, the liquid injection holes 11 are distributed at the central position of the bottom of the housing body 1, and the welding parts 13 are distributed around the circumference of the liquid injection holes 11.

[0027] In this embodiment, the welding part 13 is a groove formed by the depression of the bottom plane of the housing body 1 towards the inside of the housing, and the thickness of the groove is less than the bottom thickness of the housing body 1, and the shape is strip-shaped.

[0028] In this embodiment, a dust-proof sticker 112 is fixedly connected to the connection part of the explosion-proof sheet and the liquid injection hole 11 to reduce the pollution of the internal battery cell 3 of the housing body 1 by dust and improve the safety of the single battery.

[0029] Embodiment 2

[0030] As Figures 1-5 and Figure 7 shown:

[0031] The purpose of this embodiment is to provide a cylindrical battery housing different from the specific Embodiment 1; the difference feature between this embodiment and Embodiment 1 is that: a notch 1111 is provided on the explosion-proof sheet, and the pressure relief pressure can be further reduced through the notch 1111 to improve the safety of the single battery, and setting the notch 1111 on the explosion-proof sheet can make the pressure preferentially break through the position of the notch 1111, thereby controlling the detonation position and facilitating the construction of a pressure relief channel.

[0032] In this embodiment, the notch 1111 is annular, and in some other ways, it can also be cross-shaped or polygonal.

[0033] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A cylindrical battery housing, characterized in that: It includes a housing body, and liquid injection holes and a number of welding parts are distributed at the bottom of the housing body. An explosion-proof valve is arranged on the liquid injection hole; the liquid injection hole is arranged at the center position of the bottom of the housing body, and the welding parts are circumferentially distributed around the liquid injection hole.

2. The cylindrical battery case according to claim 1, wherein: The welding part is a groove formed by the bottom plane of the housing body recessing towards the inside of the housing.

3. The cylindrical battery case according to claim 2, wherein: The thickness of the groove is less than the thickness of the bottom of the housing body.

4. The cylindrical battery case according to claim 1, characterized in that: The explosion-proof valve includes an explosion-proof sheet, and the explosion-proof sheet is fixedly connected in the liquid injection hole.

5. The cylindrical battery case according to claim 4, wherein: A dust-proof sticker is fixedly connected to the connection part between the explosion-proof sheet and the liquid injection hole.

6. The cylindrical battery housing according to claim 4, wherein: The thickness of the explosion-proof sheet is less than the thickness of the housing body.

7. The cylindrical battery case according to claim 5, wherein: Scratches are provided on the explosion-proof sheet.

8. The cylindrical battery housing according to any one of claims 1-7, characterized in that: The housing body is a cavity structure with one end open, and a cover plate is fixedly connected to the open end of the housing body. A pole hole is opened at the center position of the cover plate, and a pole assembly is fixedly connected in the pole hole. The pole assembly includes a pole body and an insulating part. The pole body is fixedly connected in the pole hole, and the insulating part is fixedly connected between the pole body and the pole hole. A bus bar is fixedly connected to the bottom of the pole body, and the bus bar is welded to the upper-side tab of the battery cell. An explosion-proof hole is opened on the cover plate, and an explosion-proof valve is fixedly connected in the explosion-proof hole.

9. A single cell, characterized in that: It includes a cylindrical battery housing according to any one of claims 1-8.

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