Cylindrical battery

Abstract

The utility model discloses a cylindrical battery which comprises a battery cell, a first connecting piece, a second connecting piece and a sleeve, and two ends of the battery cell are respectively a first pole end and a second pole end which are opposite in polarity; the sleeve is sleeved on the battery cell; the first connecting piece is electrically connected with the first electrode end; the second connecting piece is electrically connected with the second electrode end, the second connecting piece extends to the first electrode end in the axial direction of the battery cell, and the second connecting piece is partially located between the sleeve and the battery cell. The first connecting piece and the second connecting piece which are connected with the first pole end and the second pole end are led out at the same end, so that the overall volume of the battery is reduced, and the effect of improving the actual energy density of the battery is achieved. Meanwhile, due to the arrangement of the sleeve, the second connecting piece can be fixed on the battery cell, so that the second connecting piece can be effectively prevented from moving or falling off from the battery cell, the stability of electric connection is ensured, and meanwhile, insulation protection is provided for the cylindrical battery.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and particularly to a cylindrical battery. Background Art

[0002] In the context of the rapid development of modern technology, due to its high energy density characteristics, lithium-ion batteries have become the preferred energy storage technology in 3C products (i.e., computers, communications, and consumer electronic products). With the increasing demand of consumers for longer running time and smaller size of portable devices, the energy density of lithium-ion batteries has become a key indicator to measure their performance.

[0003] However, in the existing design of cylindrical lithium batteries, there is a significant limitation: in order to achieve the connection between the battery and the device, usually a lead wire needs to be led out at each end of the battery. Although this design is simple and practical, the existence of the lead wire actually increases the overall volume of the battery. Since the battery is installed in a limited space, the additional volume added by the lead wire does not contribute to electric energy storage, but instead results in the actual energy density of the battery being lower than its theoretical energy density at the time of design, which not only affects the further improvement of battery performance but also affects the competitiveness of the product. Summary of the Utility Model

[0004] An embodiment of the utility model provides a cylindrical battery, which can improve the actual energy density of the cylindrical battery, thereby enhancing the competitiveness of the product.

[0005] Specifically, the utility model provides a cylindrical battery, which includes a battery cell, a first connector, a second connector, and a sleeve. The two ends of the battery cell are respectively a first extreme end and a second extreme end with opposite polarities; the sleeve is sleeved on the battery cell, and the end parts at both ends of the sleeve respectively extend to the first extreme end and the second extreme end; the first connector is electrically connected to the first extreme end; the second connector is electrically connected to the second extreme end, the second connector extends along the axial direction of the battery cell to the first extreme end, and a part of the second connector is located between the sleeve and the battery cell.

[0006] Optionally, the first connector includes a first connection part and a first extension part. The first connection part is electrically connected to the first extreme end and extends along the radial direction of the battery cell; the first extension part is connected to the first connection part and extends in a direction away from the battery cell.

[0007] Optionally, the second connector includes a second connection part and a second extension part. The second connection part is electrically connected to the second extreme end and extends along the radial direction of the battery cell; the second extension part is connected to the second connection part, and the second extension part is located between the battery cell and the sleeve.

[0008] Optionally, the cylindrical battery further includes a first insulating sheet, wherein the first insulating sheet is disposed on the first extreme end of the battery cell, and the first connecting portion is located between the first insulating sheet and the battery cell.

[0009] Optionally, the second connecting member also includes a third extension portion and a fourth extension portion, the third extension portion is connected to an end of the second extension portion away from the second connecting portion and extends in the radial direction of the battery cell, and the third extension portion is located on a side of the first insulating sheet away from the first connecting portion; the fourth extension portion is connected to an end of the third extension portion away from the second extension portion and extends in a direction away from the battery cell; the fourth extension portion is spaced apart from the first extension portion.

[0010] Optionally, the second connecting portion, the second extending portion and the third extending portion are integrally bent and formed.

[0011] Optionally, the first connecting portion and the first extending portion are connected by butt welding; and the third extending portion and the fourth extending portion are connected by butt welding.

[0012] Optionally, the cylindrical battery also includes a second insulating sheet and a third insulating sheet, the second insulating sheet covers the first insulating sheet, and the second insulating sheet is located between the third extension portion and one end surface of the sleeve; the third insulating sheet is arranged on the second extreme end of the battery cell, and the third insulating sheet is located between the second connecting portion and the other end surface of the sleeve.

[0013] Optionally, a first notch is provided on the edge of the first insulating sheet, and the first extension portion passes through the first notch; a second notch is provided on the edge of the second insulating sheet, and the first extension portion and the fourth extension portion both pass through the second notch.

[0014] Optionally, the cylindrical battery further includes a first buffer layer and a second buffer layer, wherein the first buffer layer is disposed on the first extreme terminal of the battery cell and connected to the sleeve; the second buffer layer is disposed on the second extreme terminal of the battery cell and connected to the sleeve.

[0015] The beneficial effects of the utility model are:

[0016] In the cylindrical battery provided by the utility model, the first connector and the second connector connected to the first extreme terminal and the second extreme terminal are led out at the same end, thereby reducing the overall volume of the battery, achieving the effect of increasing the actual energy density of the battery, which is conducive to improving the competitiveness of the product. At the same time, due to the setting of the sleeve, the second connector extending along the side surface of the battery cell can be fixed on the battery cell, which can not only effectively prevent the second connector from moving or falling off on the battery cell, ensuring the stability of the electrical connection, but also provide insulation protection for the cylindrical battery. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic exploded view of a cylindrical battery in an embodiment of the present invention;

[0019] Figure 2 is a schematic partial structure view of a cylindrical battery in an embodiment of the present invention;

[0020] Figure 3 is a schematic partial structure view of a cylindrical battery in an embodiment of the present invention;

[0021] Figure 4 is a schematic partial structure view of a cylindrical battery in an embodiment of the present invention;

[0022] Figure 5 is a schematic partial structure view of a cylindrical battery in an embodiment of the present invention;

[0023] Figure 6 is a schematic partial structure view of a cylindrical battery in an embodiment of the present invention;

[0024] Figure 7 is a schematic partial structure view of a cylindrical battery in an embodiment of the present invention;

[0025] Figure 8 is a schematic structure view of a cylindrical battery in an embodiment of the present invention.

[0026] In the figure: 100, battery cell; 110, first extreme; 120, second extreme; 200, first connecting member; 210, first connecting portion; 220, first extending portion; 300, second connecting member; 310, second connecting portion; 320, second extending portion; 330, third extending portion; 340, fourth extending portion; 400, sleeve; 410, end portion; 510, first insulating sheet; 511, first notch; 520, second insulating sheet; 521, second notch; 530, third insulating sheet; 600, insulating sleeve; 710, first buffer layer; 720, second buffer layer. Detailed Description of the Embodiments

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. 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.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] Figure 1 is a schematic exploded view of a cylindrical battery in an embodiment of the present utility model, as Figure 1 shown, and referring to Figures 2 to 8 , an embodiment of the present utility model provides a cylindrical battery, including a battery cell 100, a first connector 200, a second connector 300, and a sleeve 400. The two ends of the battery cell 100 are respectively a first extreme 110 and a second extreme 120 with opposite polarities; the sleeve 400 is sleeved on the battery cell 100, and the end portions 410 at both ends of the sleeve 400 respectively extend to the first extreme 110 and the second extreme 120; the first connector 200 is electrically connected to the first extreme 110; the second connector 300 is electrically connected to the second extreme 120, the second connector 300 extends along the axial direction of the battery cell 100 to the first extreme 110, and a part of the second connector 300 is located between the sleeve 400 and the battery cell 100.

[0031] In this embodiment, the first extreme 110 and the second extreme 120 with opposite polarities are the positive extreme and the negative extreme respectively. By leading out the first connecting member 200 and the second connecting member 300 that connect the first extreme 110 and the second extreme 120 at the same end, the overall volume of the battery is reduced, achieving the effect of improving the actual energy density of the battery, which is beneficial to enhancing the competitiveness of the product. At the same time, due to the setting of the sleeve 400, the second connecting member 300 extending along the side surface of the battery cell 100 can be fixed on the battery cell 100, which can not only effectively prevent the second connecting member 300 from moving or falling off on the battery cell 100, ensuring the stability of the electrical connection, but also provide insulation protection for the second connecting member 300 and the battery cell 100.

[0032] As Figure 2 , Figure 4 , Figure 5 shown, in an embodiment of the present utility model, the first connecting member 200 includes a first connecting portion 210 and a first extending portion 220. The first connecting portion 210 is electrically connected to the first extreme 110 and extends along the radial direction of the battery cell 100. The first extending portion 220 is connected to the first connecting portion 210 and extends in a direction away from the battery cell 100. The second connecting member 300 includes a second connecting portion 310 and a second extending portion 320. The second connecting portion 310 is electrically connected to the second extreme 120 and extends along the radial direction of the battery cell 100. The second extending portion 320 is connected to the second connecting portion 310, and the second extending portion 320 is located between the battery cell 100 and the sleeve 400, so as to lead out the second connecting member 300 and the first connecting member 200 at the same end of the battery cell 100.

[0033] As Figure 3 shown, in an embodiment of the present utility model, the cylindrical battery further includes a first insulating sheet 510. The first insulating sheet 510 is disposed on the first extreme 110 of the battery cell 100, and the first connecting portion 210 is located between the first insulating sheet 510 and the battery cell 100. Further, the second connecting member 300 further includes a third extending portion 330 and a fourth extending portion 340. The third extending portion 330 is connected to one end of the second extending portion 320 away from the second connecting portion 310 and extends along the radial direction of the battery cell 100. The third extending portion 330 is located on a side of the first insulating sheet 510 facing away from the first connecting portion 210. The fourth extending portion 340 is connected to one end of the third extending portion 330 away from the second extending portion 320 and extends in a direction away from the battery cell 100. The fourth extending portion 340 is spaced apart from the first extending portion 220.

[0034] In this embodiment, through the provision of the first insulating sheet 510, insulation can be achieved between the first connecting portion 210 and the third extending portion 330. Moreover, since the third extending portion 330 and the second connecting portion 310 are respectively provided at both ends of the battery cell 100, the second extending portion 320 located between the third extending portion 330 and the second connecting portion 310 can be fixed, effectively preventing the second connecting portion 310 from moving or detaching from the battery cell 100 and ensuring the stability of the electrical connection.

[0035] Furthermore, an insulating sleeve 600 is sleeved on one end of the first extending portion 220 away from the first connecting portion 210 to prevent the first extending portion 220 from contacting the fourth extending portion 340 and causing a short circuit in the battery cell 100. Similarly, an insulating sleeve 600 can also be sleeved on one end of the fourth extending portion 340 away from the third extending portion 330.

[0036] In an embodiment of the present utility model, the second connecting portion 310, the second extending portion 320 and the third extending portion 330 are integrally bent and formed, without being connected through any additional connecting structure, avoiding usage failures caused by loose connections.

[0037] Specifically, the second connecting portion 310, the second extending portion 320 and the third extending portion 330 are nickel sheets; the first connecting portion 210 is a nickel sheet. The reason for using nickel sheets is that nickel sheets have good electrical conductivity, corrosion resistance, oxidation resistance and other advantages. The first extending portion 220 and the fourth extending portion 340 are both leads.

[0038] In an embodiment of the present utility model, the first connecting portion 210 and the first extending portion 220 are connected by spot welding. Using spot welding for connection, compared with soldering and riveting methods, the space occupied by the joint of the first connecting portion 210 and the first extending portion 220 is small, and the process is simple, efficient and clean. To achieve the same effect, the third extending portion 330 and the fourth extending portion 340 are connected by spot welding.

[0039] As Figure 1 、 Figure 6 shown, in an embodiment of the present utility model, the cylindrical battery further includes a second insulating sheet 520 and a third insulating sheet 530. The second insulating sheet 520 covers the first insulating sheet 510, and the second insulating sheet 520 is located between the third extending portion 330 and one end face of the sleeve 400; the third insulating sheet 530 is provided on the second extreme 120 of the battery cell 100, and the third insulating sheet 530 is located between the second connecting portion 310 and the other end face of the sleeve 400. The provision of the second insulating sheet 520 and the third insulating sheet 530 can provide insulation protection for the battery cell 100 and the second connecting member 300.

[0040] Specifically, as Figure 7 and Figure 8 shown, the sleeve 400 is made of a heat-shrinkable material. During application, the sleeve 400 is sleeved on the battery cell 100, the furnace temperature is set to 120 ± 10 °C, the sleeve 400 is shrunk, and the end portions 410 at both ends of the sleeve 400 are evenly coated on the first extreme end 110 and the second extreme end 120, making the connection between the components of the cylindrical battery and the battery cell 100 tighter, enhancing the overall structural strength, and also being able to block the influence of environmental factors such as moisture and dust on the battery cell 100, thereby extending the service life of the cylindrical battery.

[0041] In an embodiment of the present invention, a first notch 511 is provided on the edge of the first insulating sheet 510, and the first extending portion 220 passes through the first notch 511; a second notch 521 is provided on the edge of the second insulating sheet 520, and both the first extending portion 220 and the fourth extending portion 340 pass through the second notch 521. The settings of the first notch 511 and the second notch 521 facilitate the bending and leading-out of the first extending portion 220 and the fourth extending portion 340 at the notch positions. While optimizing the leading-out arrangement, the space utilization rate is also improved, and the product is more beautiful.

[0042] As Figure 8 shown, in an embodiment of the present invention, the cylindrical battery further includes a first buffer layer 710 and a second buffer layer 720. The first buffer layer 710 is provided on the first extreme end 110 of the battery cell 100 and is connected to the sleeve 400; the second buffer layer 720 is provided on the second extreme end 120 of the battery cell 100 and is connected to the sleeve 400. Preferably, both the first buffer layer 710 and the second buffer layer 720 are EVA sponges. The settings of the first buffer layer 710 and the second buffer layer 720 can play a role in shock absorption and auxiliary fixation for the battery cell 100, thereby protecting the battery structure and performance stability.

[0043] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some 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 present invention, and should all be included in the protection scope of the present invention.

Claims

1. A cylindrical battery, characterized in that: It includes a battery cell, a first connecting member, a second connecting member and a sleeve, wherein the two ends of the battery cell are respectively a first extreme terminal and a second extreme terminal with opposite polarities; the sleeve is sleeved on the battery cell, and the ends of the two ends of the sleeve extend to the first extreme terminal and the second extreme terminal respectively; the first connecting member is electrically connected to the first extreme terminal; the second connecting member is electrically connected to the second extreme terminal, the second connecting member extends to the first extreme terminal along the axial direction of the battery cell, and the second connecting member is partially located between the sleeve and the battery cell.

2. The cylindrical battery according to claim 1, characterized in that: The first connecting member includes a first connecting portion and a first extending portion, wherein the first connecting portion is electrically connected to the first pole and extends in a radial direction of the battery core; and the first extending portion is connected to the first connecting portion and extends in a direction away from the battery core.

3. The cylindrical battery according to claim 2, characterized in that: The second connecting member includes a second connecting portion and a second extending portion, the second connecting portion is electrically connected to the second pole and extends radially of the battery core; the second extending portion is connected to the second connecting portion, and the second extending portion is located between the battery core and the sleeve.

4. The cylindrical battery according to claim 3, characterized in that: The cylindrical battery further includes a first insulating sheet, which is disposed on the first terminal end of the battery cell, and the first connecting portion is located between the first insulating sheet and the battery cell.

5. The cylindrical battery according to claim 4, characterized in that: The second connecting member also includes a third extension portion and a fourth extension portion, the third extension portion is connected to an end of the second extension portion away from the second connecting portion and extends in the radial direction of the battery cell, and the third extension portion is located on a side of the first insulating sheet away from the first connecting portion; the fourth extension portion is connected to an end of the third extension portion away from the second extension portion and extends in a direction away from the battery cell; the fourth extension portion is spaced apart from the first extension portion.

6. The cylindrical battery according to claim 5, characterized in that: The second connecting portion, the second extending portion and the third extending portion are integrally bent and formed.

7. The cylindrical battery according to claim 5, characterized in that: The first connecting portion and the first extending portion are connected by butt welding; the third extending portion and the fourth extending portion are connected by butt welding.

8. The cylindrical battery according to claim 5, characterized in that: The cylindrical battery also includes a second insulating sheet and a third insulating sheet, wherein the second insulating sheet covers the first insulating sheet and is located between the third extension portion and one end surface of the sleeve; the third insulating sheet is arranged on the second extreme end of the battery cell and is located between the second connecting portion and the other end surface of the sleeve.

9. The cylindrical battery according to claim 8, characterized in that: A first notch is arranged on the edge of the first insulating sheet, and the first extension portion passes through the first notch; a second notch is arranged on the edge of the second insulating sheet, and the first extension portion and the fourth extension portion both pass through the second notch.

10. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further includes a first buffer layer and a second buffer layer, wherein the first buffer layer is disposed on the first terminal end of the battery cell and connected to the sleeve; and the second buffer layer is disposed on the second terminal end of the battery cell and connected to the sleeve.

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