Cylindrical battery

Abstract

This invention relates to the field of battery technology and proposes a cylindrical battery, comprising: a battery casing; a battery cell disposed within the battery casing, the battery cell including a cell body and tabs, the tabs extending from at least one side of the cell body; a first insulating film disposed on the outer surface of the cell body and connected to the cell; and a second insulating film disposed on the outer surface of the cell body, covering and connecting the first insulating film, with one end of the second insulating film not lower than the end face of the cell body where the tabs are located, and the other end of the second insulating film overlapping the first insulating film, such that a portion of the second insulating film overlaps with the first insulating film, the second insulating film pressing against the first insulating film, thereby improving the insulation performance of the first insulating film on the cell body, enhancing the constraint ability of the first insulating film on the cell body, preventing the first insulating film from loosening and causing insulation failure, and avoiding the lack of internal pre-tightening force affecting the overall energy density of the battery, thereby improving the performance of the battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cylindrical battery. Background Technology

[0002] In related technologies, the outer surface of the battery cell can be insulated and protected by an insulating film. However, due to the limitations of the connection method of the insulating film, the stability of the insulating film is relatively poor, and it is easy to detach from the outer surface of the cell. Summary of the Invention

[0003] This invention provides a cylindrical battery to improve battery performance.

[0004] This invention provides a cylindrical battery, comprising:

[0005] Battery casing;

[0006] A battery cell is disposed within a battery casing. The battery cell includes a cell body and tabs, with the tabs extending from at least one side of the cell body.

[0007] The first insulating film is disposed on the outer surface of the battery cell body and is fixedly connected to the battery cell.

[0008] The second insulating film is disposed on the outer surface of the battery cell body. The second insulating film covers at least a portion of the first insulating film and is fixedly connected to the first insulating film. One end of the second insulating film is not lower than the end face of the battery cell body where the tab is disposed, and the other end of the second insulating film overlaps with the first insulating film, so that a portion of the second insulating film overlaps with the first insulating film.

[0009] The cylindrical battery of this invention includes a battery casing, a battery cell, a first insulating film, and a second insulating film. The battery cell is disposed inside the battery casing, and at least one side of the battery cell body extends out as a tab. The first insulating film and the second insulating film are disposed on the outer surface of the battery cell body to achieve insulation protection for the battery cell body. By partially covering the first insulating film with one end of the second insulating film not lower than the end face of the battery cell body where the tab is disposed, and the other end of the second insulating film overlapping the first insulating film, the second insulating film can not only achieve insulation protection, but also press the second insulating film tightly against the first insulating film, thereby improving the insulation performance of the first insulating film on the battery cell body and enhancing the constraint ability of the first insulating film on the battery cell body. This prevents the first insulating film from loosening and causing insulation failure, and avoids the lack of internal pre-tightening force affecting the overall energy density of the cylindrical battery, thereby improving the performance of the cylindrical battery. Attached Figure Description

[0010] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0011] Figure 1 This is a schematic diagram of the structure of a cylindrical battery according to an exemplary embodiment;

[0012] Figure 2 This is an exploded structural diagram of a cylindrical battery according to an exemplary embodiment;

[0013] Figure 3 This is another exploded structural diagram of a cylindrical battery according to an exemplary embodiment;

[0014] Figure 4 This is a partial structural schematic diagram of a cylindrical battery according to an exemplary embodiment.

[0015] The annotations in the attached figures are explained as follows:

[0016] 10. Battery casing; 11. First casing component; 12. Second casing component; 20. Battery cell; 21. Battery cell body; 22. Terminal tab; 30. First insulating film; 40. Second insulating film; 50. Terminal assembly. Detailed Implementation

[0017] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0018] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0019] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0020] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0021] One embodiment of the present invention provides a cylindrical battery, please refer to... Figures 1 to 4 The cylindrical battery includes: a battery casing 10; a battery cell 20 disposed within the battery casing 10, the battery cell 20 including a battery body 21 and a tab 22, the tab 22 extending from at least one side of the battery body 21; a first insulating film 30 disposed on the outer surface of the battery body 21 and fixedly connected to the battery cell 20; and a second insulating film 40 disposed on the outer surface of the battery body 21, covering at least a portion of the first insulating film 30 and fixedly connected to the first insulating film 30, with one end of the second insulating film 40 not lower than the end face of the battery body 21 where the tab 22 is disposed, and the other end of the second insulating film 40 overlapping the first insulating film 30, such that a portion of the second insulating film 40 overlaps with the first insulating film 30.

[0022] An embodiment of the present invention provides a cylindrical battery comprising a battery casing 10, a battery cell 20, a first insulating film 30, and a second insulating film 40. The battery cell 20 is disposed within the battery casing 10, and at least one side of the battery cell body 21 extends a tab 22. The first insulating film 30 and the second insulating film 40 are disposed on the outer surface of the battery cell body 21 to provide insulation protection for the battery cell body 21. By partially covering the first insulating film 30 with one end of the second insulating film 40 not lower than the end face of the battery cell body 21 where the tab 22 is provided, and the other end of the second insulating film 40 overlapping the first insulating film 30, the second insulating film 40 can be pressed tightly against the first insulating film 30 while ensuring insulation protection. This improves the insulation performance of the first insulating film 30 on the battery cell body 21 and enhances its constraint on the battery cell body 21, preventing the first insulating film 30 from loosening and causing insulation failure, and avoiding the lack of internal pre-tightening force affecting the overall energy density of the cylindrical battery, thereby improving the performance of the cylindrical battery.

[0023] It should be noted that the first insulating film 30 can cover the entire circumferential outer surface of the cell body 21 to achieve reliable insulation protection for the cell body 21 and provide pre-tightening force to the cell body 21. Furthermore, the second insulating film 40 is wrapped around the circumferential outer surface of the cell body 21, that is, the second insulating film 40 is wrapped around the first insulating film 30. In this way, while providing insulation protection and constraint capability to the cell body 21, the second insulating film 40 can also prevent it from detaching from the cell body 21, thereby ensuring that the cell body 21 has sufficient insulation performance and avoiding the risk of insulation failure between the cell body 21 and the battery casing 10. In some embodiments, it is not excluded that the first insulating film 30 can cover a portion of the circumferential outer surface of the cell body 21.

[0024] The first insulating film 30 can be fixedly connected to the battery cell 20. In this case, the first insulating film 30 can be directly fixedly connected to the battery cell body 21. For example, the first insulating film 30 can be bonded to the battery cell body 21. Alternatively, the first insulating film 30 can be connected to the battery cell body 21 through the second insulating film 40. For example, there may be no adhesive layer between the second insulating film 40 and the battery cell body 21, but the second insulating film 40 can be bonded to the first insulating film 30 and directly bonded to the battery cell body 21.

[0025] The second insulating film 40 is fixedly connected to the first insulating film 30. The second insulating film 40 and the first insulating film 30 can be directly fixedly connected, for example, the second insulating film 40 and the first insulating film 30 can be bonded together, or the first insulating film 30 can be bonded to the battery cell body 21, and the second insulating film 40 can be bonded to the battery cell body 21 without an adhesive layer between it and the first insulating film 30.

[0026] A battery comprises a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging and discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged. Both the first and second electrodes are coated with active materials.

[0027] The battery can be a wound battery, which is formed by winding a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes to obtain a wound battery cell. A first insulating film 30 covers the wound battery cell, while a second insulating film 40 covers the first insulating film 30, thereby protecting the first insulating film 30.

[0028] In one embodiment, the first insulating film 30 is bonded to the cell 20. This not only simplifies the connection method and prevents the cylindrical battery from accumulating a large diameter, but also ensures the connection stability between the first insulating film 30 and the cell 20, thereby ensuring that the first insulating film 30 reliably protects the cell 20.

[0029] In one embodiment, the second insulating film 40 is bonded to the first insulating film 30, thereby simplifying the connection method between the second insulating film 40 and the first insulating film 30 and ensuring a reliable connection between the second insulating film 40 and the first insulating film 30, thereby improving the constraint capability on the battery cell body 21.

[0030] In one embodiment, the first insulating film 30 is bonded to the battery cell 20, and the second insulating film 40 is bonded to the first insulating film 30, thereby ensuring that the first insulating film 30 and the second insulating film 40 provide reliable insulation protection for the battery cell body 21.

[0031] In one embodiment, one end of the second insulating film 40 extends beyond the end face of the battery cell body 21 where the tab 22 is provided, so that a portion of the second insulating film 40 is located outside the circumferential outer surface of the tab 22, thereby achieving circumferential protection for the tab 22 and enabling the second insulating film 40 to provide insulation protection for the tab 22 to a certain extent.

[0032] In one embodiment, one end of the second insulating film 40 is disposed at a position not lower than the end face of the tab 22 away from the cell body 21. That is, the second insulating film 40 can protect the entire circumferential outer surface of the tab 22, thereby ensuring reliable insulation between the tab 22 and the battery casing 10, and thus ensuring the safe use performance of the battery.

[0033] The length of one end of the second insulating film 40 extending beyond the end face of the cell body 21 where the tab 22 is provided is not less than the length of the tab 22. Therefore, the second insulating film 40 can effectively protect the first insulating film 30 and also protect the tab 22, thereby improving the insulation performance between the cell 20 and the battery casing 10.

[0034] In one embodiment, one end of the second insulating film 40 extends beyond the end face of the tab portion 22 to contact the battery casing 10, thereby enabling the second insulating film 40 to achieve the insulation protection function to the greatest extent and improve the internal safety performance of the battery.

[0035] In one embodiment, one end of the second insulating film 40 is bonded to the battery casing 10 to improve the connection stability of the second insulating film 40 and avoid problems such as the second insulating film 40 falling off, thereby further improving the insulation protection of the battery cell 20 by the second insulating film 40 and the first insulating film 30.

[0036] In one embodiment, the area where the second insulating film 40 overlaps with the first insulating film 30 occupies 10%-40% of the outer surface area of ​​the cell body 21. While ensuring that the second insulating film 40 can play a role in fixing and protecting the first insulating film 30, it can also avoid the problem of the second insulating film 40 and the first insulating film 30 overlapping too much, and to a certain extent avoid the problem of excessive thickness affecting the overall space utilization of the battery.

[0037] If the area of ​​overlap between the second insulating film 40 and the first insulating film 30 is too small, the constraint between the second insulating film 40 and the first insulating film 30 will be insufficient, which may lead to the risk of the first insulating film 30 falling off and insulation failure. If the area of ​​overlap between the second insulating film 40 and the first insulating film 30 is too large, the overall thickness inside the battery casing 10 will increase, which will affect the overall space utilization of the battery.

[0038] The area where the second insulating film 40 overlaps with the first insulating film 30 can occupy 10%, 11%, 12%, 15%, 18%, 20%, 21%, 25%, 26%, 28%, 30%, 31%, 32%, 35%, 38%, 39%, or 40% of the outer surface area of ​​the cell body 21, etc.

[0039] In one embodiment, the overlap width between the second insulating film 40 and the first insulating film 30 is 5mm-30mm. This ensures that the second insulating film 40 provides sufficient constraint to the first insulating film 30, preventing the first insulating film 30 from loosening or detaching. It also avoids the problem of the second insulating film 40 being too large, thus increasing the internal space of the battery casing 10. The overlap width between the second insulating film 40 and the first insulating film 30 can be considered as the dimension of the overlap along the direction extending from the cell body 21 along the tab 22.

[0040] The overlap width between the second insulating film 40 and the first insulating film 30 can be 5mm, 6mm, 8mm, 10mm, 15mm, 18mm, 19mm, 20mm, 22mm, 25mm, 26mm, 28mm, 29mm or 30mm, etc.

[0041] In one embodiment, the thickness of the first insulating film 30 is 0.02mm-0.05mm. While ensuring that the first insulating film 30 can achieve reliable insulation performance, it can also avoid the problem of the first insulating film 30 being too thick and occupying too much space, and can reduce the weight of the first insulating film 30.

[0042] The thickness of the first insulating film 30 can be 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.046mm, 0.048mm, 0.049mm, or 0.05mm, etc.

[0043] In one embodiment, the thickness of the second insulating film 40 can be 0.02mm-0.05mm. While ensuring that the second insulating film 40 reliably protects the first insulating film 30 and can achieve reliable insulation performance, it can also avoid the problem of the second insulating film 40 being too thick and occupying too much space, and can reduce the weight of the second insulating film 40.

[0044] The thickness of the second insulating film 40 can be 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.046mm, 0.048mm, 0.049mm, or 0.05mm, etc.

[0045] In one embodiment, the thickness of the first insulating film 30 can be greater than the thickness of the second insulating film 40, thereby improving the insulation performance of the first insulating film 30 to the cell body 21 and enhancing its constraint capability on the cell body 21. Meanwhile, the second insulating film 40 will not cause the diameter of the cylindrical battery to increase too much, thereby ensuring that the cylindrical battery has a high volumetric energy density.

[0046] In some embodiments, it is not excluded that the thickness of the first insulating film 30 may be equal to the thickness of the second insulating film 40.

[0047] In one embodiment, the adhesive strength of the first insulating film 30 is greater than that of the second insulating film 40, thereby enabling the first insulating film 30 to be reliably bonded to the battery cell body 21, and also facilitating the bonding of the second insulating film 40 to the first insulating film 30, thus ensuring that the second insulating film 40 can protect the first insulating film 30.

[0048] The first insulating film 30 can effectively cover the battery cell body 21, thereby providing sufficient constraint to the battery cell body 21 and preventing the first insulating film 30 from detaching from the battery cell body 21. The main purpose of the second insulating film 40 is to protect the first insulating film 30. Therefore, the adhesive strength of the second insulating film 40 can be relatively small, so that the second insulating film 40 can be reliably bonded to the battery cell body 21.

[0049] The adhesive strength of the first insulating film 30 is greater than that of the second insulating film 40, meaning the peel force of the first insulating film 30 is greater than that of the second insulating film 40. The second insulating film 40 can be removed from the first insulating film 30, thus facilitating the replacement of the second insulating film 40.

[0050] In some embodiments, it is not excluded that the adhesive strength of the first insulating film 30 is equal to the adhesive strength of the second insulating film 40.

[0051] In one embodiment, the second insulating film 40 has overlapping areas, which allows the second insulating film 40 to form a circumferentially closed space, thereby improving the protective capability of the second insulating film 40 against the first insulating film 30 and avoiding risks such as detachment of the first insulating film 30.

[0052] The second insulating film 40 has an overlapping area, that is, the second insulating film 40 can have a first end and a second end, and the first end can be covered by the second insulating film 40, so that the second insulating film 40 has an overlapping area, which can not only achieve efficient protection of the first insulating film 30, but also improve the insulation protection capability of the second insulating film 40.

[0053] In one embodiment, the width of the overlapping area is 0.2mm-5mm. This ensures that the second insulating film 40 has reliable connection strength and constraint, while also preventing the second insulating film 40 from becoming too thick, thereby reducing the overall weight of the battery.

[0054] The width of the overlapping area can be 0.2mm, 0.3mm, 0.5mm, 1mm, 1.2mm, 1.3mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.2mm, 4.3mm, 4.5mm, 4.8mm, 4.9mm, or 5mm, etc.

[0055] In one embodiment, the first insulating film 30 is a first adhesive tape and the second insulating film 40 is a second adhesive tape, thereby enabling the first insulating film 30 to be reliably bonded to the cell body 21 and the second insulating film 40 to be reliably bonded to the first insulating film 30, thereby improving the insulation protection capability of the first insulating film 30 and the second insulating film 40, and thus ensuring the safe use performance of the battery.

[0056] The adhesive layer of the first insulating film 30 is bonded to the battery cell body 21, and the adhesive layer of the second insulating film 40 is bonded to the first insulating film 30.

[0057] In one embodiment, the tab portion 22 includes a positive tab and a negative tab, which extend from the same side of the cell body 21. The fact that the positive and negative tabs extend from the same side of the cell body 21 improves the overall space utilization within the battery and allows the positive and negative tabs to be connected to the positive and negative terminals located on the same side of the battery casing 10, respectively. Alternatively, the positive and negative tabs can be connected to the battery casing 10 and the terminals, respectively. The battery casing 10 serves as one electrode lead-out terminal of the battery, facilitating subsequent connection during battery assembly. Furthermore, the relatively large area of ​​the battery casing 10 ensures a reliable current-carrying area during battery assembly, thereby guaranteeing the overall charge and discharge rate of the battery.

[0058] In some embodiments, it is not excluded that the positive and negative tabs may extend from opposite sides of the cell body 21.

[0059] It should be noted that there can be multiple positive and negative electrodes, and the positive and negative electrodes can be arranged alternately to ensure the insulation performance between the positive and negative electrodes. Alternatively, there can be only one positive and one negative electrode.

[0060] In one embodiment, such as Figures 1 to 3 As shown, the battery casing 10 includes: a first casing member 11; and a second casing member 12, which is connected to the first casing member 11 to effectively protect the battery cell 20.

[0061] In one embodiment, the first housing member 11 is a cover plate, the electrode tab 22 extends toward the cover plate, the second housing member 12 may form a receiving space, the second insulating film 40 may be connected to the first housing member 11, and the cover plate can also facilitate battery assembly. In some embodiments, both the first housing member 11 and the second housing member 12 may form a receiving space.

[0062] The first housing 11 may be provided with a terminal assembly 50, and the terminal assembly 50 and the battery housing 10 may be electrically connected to two tabs 22 of different polarities, respectively. The terminal assembly 50 and the battery housing 10 may be directly connected to the two tabs 22 of different polarities, or the terminal assembly 50 and the battery housing 10 may be connected to the two tabs 22 of different polarities through two current collectors, respectively.

[0063] The first housing component 11 comprises steel, and the second housing component 12 comprises steel. Alternatively, the first housing component 11 comprises aluminum, and the second housing component 12 comprises aluminum. The first housing component 11 may comprise a composite metal material, for example, the first housing component 11 may comprise a copper-aluminum composite material, and the second housing component 12 may comprise a composite metal material, for example, the second housing component 12 may comprise a copper-aluminum composite material.

[0064] The first housing component 11 and the second housing component 12 can be welded together, or the first housing component 11 and the second housing component 12 can be riveted together.

[0065] An embodiment of the present invention also provides a battery pack including the cylindrical battery described above.

[0066] One embodiment of the present invention includes a cylindrical battery, comprising a battery casing 10, a cell 20, a first insulating film 30, and a second insulating film 40. The cell 20 is disposed within the battery casing 10, and at least one side of the cell body 21 extends a tab 22. Insulation protection of the cell body 21 is achieved by disposing the first insulating film 30 and the second insulating film 40 on the outer surface of the cell body 21. By partially covering the first insulating film 30 with one end of the second insulating film 40 not lower than the end face of the cell body 21 where the tab 22 is located, and the other end of the second insulating film 40 overlapping the first insulating film 30, the second insulating film 40 can be pressed tightly against the first insulating film 30 while ensuring insulation protection. This improves the insulation performance of the first insulating film 30 on the cell body 21 and enhances its constraint on the cell body 21, preventing the first insulating film 30 from loosening and causing insulation failure, and avoiding the lack of internal pre-tightening force affecting the overall energy density of the cylindrical battery, thereby improving the performance of the battery pack.

[0067] In one embodiment, the battery pack is a battery module or a battery pack.

[0068] The battery module includes multiple cylindrical batteries, and may also include a bracket on which the cylindrical batteries can be fixed.

[0069] The battery pack includes multiple cylindrical batteries and a housing, which is used to hold the multiple cylindrical batteries in place.

[0070] It should be noted that the battery pack includes cylindrical batteries, and there can be multiple cylindrical batteries housed within the casing. Alternatively, the multiple cylindrical batteries can be assembled into a battery module and then installed within the casing. In other words, the multiple cylindrical batteries can be directly housed within the casing, eliminating the need to group them together; the casing itself can be used to secure the batteries.

[0071] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0072] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A cylindrical battery, characterized in that, include: Battery casing (10); The battery cell (20) is disposed inside the battery casing (10). The battery cell (20) includes a battery cell body (21) and a tab (22). The tab (22) extends out from at least one side of the battery cell body (21). The first insulating film (30) is disposed on the outer surface of the battery cell body (21) and is fixedly connected to the battery cell (20); A second insulating film (40) is disposed on the outer surface of the cell body (21). The second insulating film (40) covers at least a portion of the first insulating film (30) and is fixedly connected to the first insulating film (30). One end of the second insulating film (40) is not lower than the end face of the cell body (21) where the tab (22) is provided. The other end of the second insulating film (40) overlaps with the first insulating film (30) so that a portion of the second insulating film (40) is in contact with the first insulating film (30). The membranes (30) overlap, and the second insulating membrane (40) covers the outer side of the first insulating membrane (30) away from the main body (21) of the cell. The thickness of the second insulating membrane (40) is 0.02mm-0.05mm. The second insulating membrane (40) forms an overlapping area with a width of 0.2mm-5mm. Along the direction from the main body (21) of the cell along the tab (22), the width of the overlap between the second insulating membrane (40) and the first insulating membrane (30) is 5mm-30mm.

2. The cylindrical battery according to claim 1, characterized in that, The first insulating film (30) is bonded to the battery cell (20), and / or the second insulating film (40) is bonded to the first insulating film (30).

3. The cylindrical battery according to claim 1, characterized in that, One end of the second insulating film (40) extends beyond the end face of the battery cell body (21) where the tab (22) is located.

4. The cylindrical battery according to claim 3, characterized in that, One end of the second insulating film (40) is disposed at a position not lower than the end face of the tab portion (22) away from the cell body (21).

5. The cylindrical battery according to claim 4, characterized in that, One end of the second insulating film (40) extends beyond the end face of the tab (22) to contact the battery casing (10).

6. The cylindrical battery according to claim 5, characterized in that, One end of the second insulating film (40) is bonded to the battery casing (10).

7. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The area where the second insulating film (40) overlaps with the first insulating film (30) occupies 10%-40% of the circumferential outer surface area of ​​the cell body (21).

8. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The thickness of the first insulating film (30) is greater than the thickness of the second insulating film (40).

9. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The thickness of the first insulating film (30) is 0.02mm-0.05mm.

10. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The adhesive strength of the first insulating film (30) is greater than that of the second insulating film (40).

11. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The tab portion (22) includes a positive tab and a negative tab, which extend from the same side of the cell body (21).

12. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The first insulating film (30) is a first tape, and the second insulating film (40) is a second tape.

13. The cylindrical battery according to any one of claims 1 to 6, characterized in that, The battery casing (10) includes: First housing component (11); The second housing component (12) is connected to the first housing component (11); The first housing component (11) is a cover plate, and the tab portion (22) extends toward the cover plate.

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