Cylindrical battery cell and battery

Abstract

The utility model relates to a cylindrical battery cell and a battery, and relates to the technical field of batteries. The cylindrical battery cell provided by the utility model comprises a cover body and a shell, the shell comprises a barrel part and a top cover part, the top cover part is arranged at the top of the barrel part, the cover body is arranged at the bottom of the barrel part, reinforcing ribs cover the inner wall of the barrel part from the top to the bottom, and the reinforcing ribs extend inwards along the inner wall of the shell. Compared with a traditional smooth straight-wall shell, the shell has the advantages that the reinforcing ribs are arranged on the inner wall of the barrel part of the shell, so that the wall thickness of the shell can be reduced, the overall strength of the shell is kept unchanged, and the corresponding protection effect is achieved; meanwhile, the weight of the shell arranged in this way is reduced, the risk that the battery cell loses efficacy due to the fact that the wall thickness of the shell is reduced and the battery cell is affected by internal and external environments is avoided, and the improvement of the energy density of the battery cell is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a kind of cylindrical cell and battery. BACKGROUND

[0002] In the overall structure of cylindrical lithium ion cell, a single-pass or double-pass straight wall shell formed by stamping-drawing process is generally used, the shell is used to provide electrochemical reaction space and play the role of sealing, safety double protection, which can avoid the failure of cell caused by the influence of internal and external environment during use and storage.

[0003] To meet the safety protection of cylindrical lithium ion cell, one of the points is to resist the impact of the force of the internal and external environment of cell, which requires that the shell needs to have certain strength and hardness, and also needs sufficient thickness. Currently, cylindrical lithium ion cell usually uses steel or aluminum metal shell, which causes that although the safety protection of cell is met, the overall weight is heavy, which has certain hindering effect on the lightweight design and energy density improvement of cell. SUMMARY

[0004] The utility model aims to provide a kind of cylindrical cell and battery, which can thin the shell wall thickness, while ensuring that the overall strength of shell remains unchanged.

[0005] Embodiments of the utility model can be implemented as follows:

[0006] In a first aspect, the utility model provides a cylindrical cell, comprising:

[0007] Cover body;

[0008] Shell, the shell includes cylinder portion and top cover portion, the top of the cylinder portion is provided with the top cover portion, the bottom of the cylinder portion is provided with the cover body, the inner wall top to bottom of the cylinder portion is covered with reinforcing rib, the reinforcing rib extends to the inside along the inner wall of the shell.

[0009] In an optional embodiment, the thickness of the top cover portion is 0.5mm-1.3mm, and the thickness of the cylinder portion is 30%-35% of the thickness of the top cover portion.

[0010] In an optional embodiment, the thickness of the reinforcing rib is 20%-25% of the thickness of the cylinder portion, and the width of the reinforcing rib is greater than 2mm.

[0011] In an optional embodiment, the reinforcing rib includes a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged in an interval or the plurality of reinforcing ribs are arranged in an intersection.

[0012] In an optional embodiment, the plurality of reinforcing ribs are arranged at intervals, the plurality of reinforcing ribs are arranged longitudinally along the height direction of the cylindrical portion, or the plurality of reinforcing ribs are arranged transversely along the height direction of the cylindrical portion, or the plurality of reinforcing ribs are arranged obliquely relative to the height direction of the cylindrical portion.

[0013] In an optional embodiment, the angle between the cross-arranged reinforcing ribs is 15°-90°.

[0014] In an optional embodiment, the reinforcing ribs are arranged along the top-to-bottom direction of the inner wall of the cylindrical portion and have a spiral rib structure.

[0015] In an optional embodiment, the cylindrical battery cell further comprises a bare battery cell, the cover body is connected with the shell and forms a containing cavity, and the bare battery cell is arranged in the containing cavity.

[0016] In an optional embodiment, the bare battery cell is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab is located at the top of the bare battery cell, the top cover portion is provided with a pole assembly, the pole assembly is connected with the positive electrode tab, the negative electrode tab is located at the bottom of the bare battery cell, and the negative electrode tab is connected with the cover body.

[0017] In a second aspect, the utility model provides a battery comprising the cylindrical battery cell of any one of the preceding embodiments.

[0018] The cylindrical battery cell and the battery provided by the embodiments of the utility model have the following beneficial effects:

[0019] Compared with the traditional smooth straight wall shell, the reinforcing ribs are arranged on the inner wall of the cylindrical portion of the shell, so that the shell arranged in this way can reduce the wall thickness of the shell while ensuring the overall strength of the shell unchanged, and has the corresponding protection effect. At the same time, the shell arranged in this way also reduces the weight, avoids the risk that the battery cell is affected by the internal and external environment due to the thinning of the wall thickness, and causes the battery cell to fail, and is also beneficial to the improvement of the energy density of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained on the premise of not creating laboriously.

[0021] Figure 1 The structure schematic view of the cylindrical battery cell from the first perspective of the embodiment is provided.

[0022] Figure 2 The sectional view of the cylindrical battery cell provided by the embodiment is provided.

[0023] Figure 3 A cross-sectional view of the shell provided for the present embodiment;

[0024] Figure 4 A partial schematic view of the shell provided for the present embodiment;

[0025] Figure 5 A first structural schematic view of the reinforcing rib provided for the present embodiment;

[0026] Figure 6 A second structural schematic view of the reinforcing rib provided for the present embodiment;

[0027] Figure 7 A third structural schematic view of the reinforcing rib provided for the present embodiment;

[0028] Figure 8 A fourth structural schematic view of the reinforcing rib provided for the present embodiment.

[0029] Icon: 010 - cylindrical battery cell; 100 - cover; 110 - sealing nail; 200 - shell; 210 - barrel portion; 220 - top cover portion; 230 - reinforcing rib; 231 - first reinforcing rib; 232 - second reinforcing rib; 240 - pole assembly; 300 - bare battery cell; 400 - current collector plate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0032] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and it is not intended to indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0036] The overall structure, working principle and technical effects of the cylindrical battery cell 010 and the battery provided by the utility model are described in detail below with reference to the embodiments and the accompanying drawings.

[0037] Please refer to Figure 1 The cylindrical battery cell 010 provided by the utility model is applied to a battery.

[0038] The battery can be a single battery or a battery pack. The battery can include a lithium ion battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc.

[0039] Please refer to Figures 1-3 The cylindrical battery cell 010 provided by the utility model includes:

[0040] The cover body 100;

[0041] The shell 200 includes a cylindrical body portion 210 and a top cover portion 220. The top cover portion 220 is arranged at the top of the cylindrical body portion 210, and the cover body 100 is arranged at the bottom of the cylindrical body portion 210. The inner wall of the cylindrical body portion 210 is covered with a reinforcing rib 230 from the top to the bottom. The reinforcing rib 230 extends inward along the inner wall of the shell 200.

[0042] It can be understood that compared with the traditional smooth straight wall shell 200, the application sets the reinforcing rib 230 on the inner wall of the cylindrical body portion 210 of the shell 200. The shell 200 arranged in this way can reduce the wall thickness of the shell 200 while ensuring the overall strength of the shell 200 unchanged, and still has the corresponding protection effect. At the same time, the shell 200 arranged in this way also reduces the weight, avoids the risk of battery cell failure caused by the influence of internal and external environment on the battery cell due to the thinning of the wall thickness, and is also beneficial to the improvement of the energy density of the battery cell.

[0043] In the embodiment, the cylindrical battery cell 010 comprises a shell 200.

[0044] The shell 200 is used to protect the battery cell during normal use and storage, so as to reduce the probability of battery cell failure caused by external and internal environmental influences.

[0045] In the embodiment, please refer to Figure 2 and Figure 3 The shell 200 comprises a barrel portion 210 and a top cover portion 220. The top cover portion 220 is arranged at the top of the barrel portion 210, and the bottom of the barrel portion 210 is provided with the cover 100. The inner wall of the barrel portion 210 is covered with a reinforcing rib 230 from top to bottom. The reinforcing rib 230 extends inward along the inner wall of the shell 200.

[0046] The cover 100 is welded to the barrel portion 210 of the shell 200, so that the bare battery cell 300 can be sealed and separated from the external environment.

[0047] In the embodiment, the reinforcing rib 230, the barrel portion 210 and the top cover portion 220 are integrally formed. The reinforcing rib 230 can be formed by a spinning-additive composite process and attached to the barrel portion 210.

[0048] In the embodiment, the thickness of the top cover portion 220 is 0.5mm-1.3mm, and the thickness of the barrel portion 210 is 30%-35% of the thickness of the top cover portion 220. Please refer to Figure 4 The thickness of the reinforcing rib 230 is 20%-25% of the thickness H of the barrel portion 210. Please refer to Figures 5-6 The width W of the reinforcing rib 230 is greater than 2mm.

[0049] It can be understood that, compared with the traditional smooth straight wall shell 200, the structure design of the reinforcing rib 230 built in the inner wall of the barrel portion 210 of the shell 200 can form a high-rib thin-wall shell 200. By arranging the geometrically complex protruding reinforcing rib 230 structure on the inner side of the shell 200, the overall strength of the shell 200 can be considered while effectively reducing the thickness of the shell 200.

[0050] In one embodiment, please refer to Figures 4-6 The reinforcing rib 230 comprises a plurality of reinforcing ribs 230 arranged at intervals.

[0051] Optionally, the plurality of reinforcing ribs 230 are arranged longitudinally along the height direction of the barrel portion 210, or arranged transversely along the height direction of the barrel portion 210, or arranged obliquely relative to the height direction of the barrel portion 210.

[0052] In an alternative embodiment, please refer toFigure 5 The plurality of reinforcing ribs 230 are arranged in a staggered manner and extend in the height direction of the cylindrical portion 210 from the top to the bottom of the cylindrical portion 210.

[0053] In an alternative embodiment, referring to Figure 6 The plurality of reinforcing ribs 230 are arranged in a staggered manner and extend in the height direction of the cylindrical portion 210 from the top to the bottom of the cylindrical portion 210.

[0054] In an alternative embodiment, the plurality of reinforcing ribs 230 are arranged in a staggered manner and extend in the height direction of the cylindrical portion 210 from the top to the bottom of the cylindrical portion 210, and the plurality of reinforcing ribs 230 are arranged in an inclined manner relative to the height direction of the cylindrical portion 210.

[0055] In an embodiment, referring to Figures 7-8 The reinforcing ribs 230 include a plurality of reinforcing ribs 230 arranged in a staggered manner. The angle θ between the reinforcing ribs 230 arranged in a staggered manner is 15°-90°.

[0056] In an alternative embodiment, referring to Figure 7 The reinforcing ribs 230 include a plurality of first reinforcing ribs 231 arranged in a staggered manner and a plurality of second reinforcing ribs 232 arranged in a staggered manner. The plurality of first reinforcing ribs 231 are arranged in a staggered manner in the height direction of the cylindrical portion 210, and the plurality of second reinforcing ribs 232 are arranged in a staggered manner in the height direction of the cylindrical portion 210. The first reinforcing ribs 231 and the second reinforcing ribs 232 are arranged in a staggered manner to form an included angle θ of 90° between the first reinforcing ribs 231 and the second reinforcing ribs 232.

[0057] In an alternative embodiment, referring to Figure 8 The reinforcing ribs 230 include a plurality of first reinforcing ribs 231 arranged in a staggered manner and a plurality of second reinforcing ribs 232 arranged in a staggered manner. The plurality of first reinforcing ribs 231 are arranged in a staggered manner in the height direction of the cylindrical portion 210, and the plurality of second reinforcing ribs 232 are arranged in a staggered manner in the height direction of the cylindrical portion 210. The first reinforcing ribs 231 and the second reinforcing ribs 232 are arranged in a staggered manner to form an included angle θ of 90° between the first reinforcing ribs 231 and the second reinforcing ribs 232.

[0058] In an optional embodiment, the reinforcing ribs 230 include first reinforcing ribs 231 and second reinforcing ribs 232, wherein the first reinforcing ribs 231 are arranged transversely along the height direction of the cylindrical portion 210, the second reinforcing ribs 232 are arranged obliquely to the right along the height direction of the cylindrical portion 210, and the first reinforcing ribs 231 and the second reinforcing ribs 232 are arranged in a cross manner to form an included angle θ of 15°-90° between the first reinforcing ribs 231 and the second reinforcing ribs 232.

[0059] In an embodiment, the reinforcing ribs 230 are arranged in a spiral rib structure from the top to the bottom of the inner wall of the cylindrical portion 210.

[0060] Optionally, the reinforcing ribs 230 in the spiral rib structure can be arranged in one or multiple, and the strength and weight of the shell 200 can be adjusted by arranging the number of spiral turns of the reinforcing ribs 230 or the density of the reinforcing ribs 230.

[0061] In an embodiment, the reinforcing ribs 230 can be in a rectangular shape or a trapezoidal shape, and the arrangement of the reinforcing ribs 230 in the rectangular shape or the trapezoidal shape can enhance the strength of the cylindrical portion 210 of the shell 200, and the application is not limited in particular.

[0062] In the embodiment, the cylindrical battery cell 010 further includes a bare battery cell 300.

[0063] The cover 100 is connected with the shell 200 to form a containing cavity, and the bare battery cell 300 is arranged in the containing cavity.

[0064] In the embodiment, please refer to Figure 2 The bare battery cell 300 is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab is located at the top of the bare battery cell 300, the top cover portion 220 is provided with a pole assembly 240, the pole assembly 240 is connected with the positive electrode tab through a current collector plate 400, the negative electrode tab is located at the bottom of the bare battery cell 300, and the negative electrode tab is connected with the cover 100 through the current collector plate 400.

[0065] In the embodiment, the cover 100 is further provided with a sealing nail 110.

[0066] In summary, the cylindrical battery cell 010 and the battery provided in the embodiments of the application can reduce the wall thickness of the shell 200 while ensuring the overall strength of the shell 200, and have the corresponding protection effect, compared with the traditional smooth straight wall shell 200.

[0067] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A cylindrical cell, characterized by, The application relates to a cylindrical battery cell, comprising: a cover body; a shell, the shell comprising a barrel part and a top cover part, the top cover part being arranged at the top of the barrel part, the cover body being arranged at the bottom of the barrel part, and the inner wall of the barrel part being covered with reinforcing ribs extending inward along the inner wall of the shell from top to bottom.

2. The cylindrical cell of claim 1, wherein, The thickness of the top cover part is 0.5-1.3 mm, and the thickness of the barrel part is 30-35% of the thickness of the top cover part.

3. The cylindrical cell of claim 2, wherein, The thickness of the reinforcing ribs is 20-25% of the thickness of the barrel part, and the width of the reinforcing ribs is greater than 2 mm.

4. The cylindrical cell of claim 1, wherein, The reinforcing ribs comprise a plurality of reinforcing ribs arranged at intervals or a plurality of reinforcing ribs arranged in crisscross.

5. The cylindrical cell of claim 4, wherein, The plurality of reinforcing ribs arranged at intervals are longitudinally arranged along the height direction of the barrel part, or are transversely arranged along the height direction of the barrel part, or are obliquely arranged relative to the height direction of the barrel part.

6. The cylindrical cell of claim 4, wherein, The angle between the reinforcing ribs arranged in crisscross is 15-90 degrees.

7. The cylindrical cell of claim 1, wherein, The reinforcing ribs are arranged along the inner wall of the barrel part from top to bottom and have a spiral rib structure.

8. The cylindrical cell of claim 1, wherein, The cylindrical battery cell further comprises a bare battery cell, the cover body is connected with the shell and forms a containing cavity, and the bare battery cell is arranged in the containing cavity.

9. The cylindrical cell of claim 8, wherein, The bare battery cell is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug is arranged at the top of the bare battery cell, the top cover part is provided with a pole assembly, the pole assembly is connected with the positive electrode lug, the negative electrode lug is arranged at the bottom of the bare battery cell, and the negative electrode lug is connected with the cover body.

10. A battery, characterized by The application further relates to a cylindrical battery cell comprising any one of the cylindrical battery cells in claims 1-9.

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