battery

Abstract

The application provides a battery. The battery comprises a shell, a roll core and insulating adhesive paper. The shell is formed with a containing cavity. An opening is arranged at one end of the shell and communicates with the containing cavity. The roll core is arranged in the containing cavity. The roll core comprises opposite first and second ends. The insulating adhesive paper is arranged on the outer circumferential surface of the roll core. The insulating adhesive paper is used for separating the tab of the roll core from the side wall of the shell. The insulating adhesive paper extends from the first end to the second end. By arranging the insulating adhesive paper on the outer circumferential surface of the roll core, the tab of the roll core is separated from the side wall of the shell by the insulating adhesive paper, so that short circuit between the tab of the roll core and the side wall of the shell is avoided. By arranging the insulating adhesive paper to extend from the first end to the second end, when the roll core and the shell are assembled, the part of the insulating adhesive paper extending from the first end to the second end can be used to place the roll core into the containing cavity of the shell from the opening along the side wall of the shell, so that the risk of adhesive scraping between the side wall of the shell and the insulating adhesive paper is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery. Background Technology

[0002] Batteries typically consist of a casing, a cover, and a core. The core is located inside the casing, and the cover seals the core within the casing. Currently, the core-sealing structure usually involves applying insulating tape to the sides of the core and then flattening the tape extending from the core's end face to form insulation and prevent short circuits between the core and the inner wall of the casing. In related technologies, when the core with the insulating tape is placed into the casing, interference may occur between the casing and the insulating tape, causing the tape to scrape against the inner wall of the casing, thus affecting the subsequent welding between the casing and the cover. Utility Model Content

[0003] Embodiments of this application provide a battery that can improve the problem of adhesive scraping on the inner wall of the casing during the core insertion process.

[0004] In a first aspect, embodiments of this application provide a battery, comprising:

[0005] The outer shell has a receiving cavity, and one end of the outer shell has an opening communicating with the receiving cavity;

[0006] A core is disposed within the receiving cavity, the core comprising a first end and a second end opposite to each other;

[0007] Insulating tape is disposed on the outer peripheral surface of the core, the insulating tape being used to separate the tabs of the core from the sidewall of the outer casing, the insulating tape extending from the first end to the second end.

[0008] By applying insulating tape to the outer circumference of the core, the core's tabs are separated from the sidewalls of the outer casing, thus preventing short circuits between the core's tabs and the outer casing's sidewalls. By setting the insulating tape to extend from the first end to the second end, when assembling the core and the outer casing, the portion of the insulating tape extending from the first end to the second end can be used to insert the core into the outer casing's receiving cavity through the opening along the sidewalls of the outer casing, thereby reducing the risk of adhesive scraping between the outer casing's sidewalls and the insulating tape.

[0009] In one embodiment, the orthographic projection of the insulating tape onto the outer circumferential surface of the core covers the outer circumferential surface of the core. That is, the insulating tape fully covers the outer circumferential surface of the core, ensuring that there is no height difference between the insulating tape and the outer circumferential surface of the core, thus preventing the formation of a stepped structure. This further reduces the risk of adhesive scraping between the outer casing sidewall and the insulating tape during the core insertion process, thereby ensuring the welding effect of the outer casing in subsequent welding processes.

[0010] In one embodiment, the insulating tape includes a first covering portion disposed on the outer peripheral surface of the core. The first covering portion partially overlaps to form a first overlapping area, which extends along the axial direction of the core. Along the circumferential direction of the core, the width T1 of the first overlapping area and the perimeter L1 of the outer peripheral surface of the core satisfy the relationship: 0.5mm ≤ T1 ≤ 1 / 4L1. By setting the width T1 of the first overlapping area and the perimeter L1 of the outer peripheral surface of the core to 0.5mm ≤ T1 ≤ 1 / 4L1, the stability of the insulating tape adhesion can be ensured while avoiding excessive space occupation by the insulating tape.

[0011] In one embodiment, the first end is used to be inserted into the receiving cavity through the opening, and the insulating tape partially covers the end face of the first end. That is, the first end is the insertion end of the core. By partially covering the end face of the first end with insulating tape, when the insulating tape is placed on the outer peripheral surface of the core and covers the tabs of the core, it can be partially folded towards the end face of the first end and partially cover the end face of the first end. This allows the insulating tape to fully wrap the edge of the first end, thereby ensuring full coverage of the tabs of the first end with insulating tape and further reducing the risk of adhesive scratching between the insulating tape and the outer casing sidewall at the edge of the first end when the core is inserted into the casing.

[0012] In one embodiment, the insulating tape includes a second covering portion disposed on the first end face. The width T2 of the second covering portion, along the radial direction of the core, satisfies the relationship: T2 ≥ 1.5 mm. By setting the width T2 of the second covering portion to T2 ≥ 1.5 mm, stable coverage of the first end edge by the insulating tape can be ensured, thereby ensuring the insulating effect of the insulating tape on the first end tab and the sidewall of the outer casing, and reducing the risk of adhesive scraping between the sidewall of the outer casing and the insulating tape at the first end edge.

[0013] In one embodiment, the insulating tape includes a third covering portion that partially covers the second end face; the width T3 of the third covering portion in the radial direction of the core satisfies the relationship: T3 ≥ 1.5 mm. By setting the width T3 of the third covering portion to T3 ≥ 1.5 mm, stable coverage of the second end edge by the insulating tape can be ensured, thereby ensuring the insulating effect of the insulating tape on the second end tab and the sidewall of the outer casing.

[0014] In one embodiment, the battery further includes a retaining adhesive tape attached to the winding end of the core, with insulating adhesive tape covering the retaining adhesive tape. By setting the insulating adhesive tape to cover the retaining adhesive tape, the insulating adhesive tape can also serve the function of fixing the retaining adhesive tape. This arrangement makes the structure and application method of the retaining adhesive tape more flexible and convenient.

[0015] In one embodiment, the insulating adhesive tape includes a first covering portion disposed on the outer peripheral surface of the core, the first covering portion partially overlapping to form a first overlapping area; the first covering portion covers the fixing adhesive tape and forms a second overlapping area with the fixing adhesive tape, the second overlapping area being at least partially offset from the first overlapping area. By setting the second overlapping area to be at least partially offset from the first overlapping area, the risk of adhesive scraping of the outer shell during the core insertion process due to the second overlapping area overlapping with the first overlapping area can be reduced, thereby ensuring the subsequent welding effect of the outer shell.

[0016] In one embodiment, the orthographic projections of the first overlapping area onto the outer circumferential surface of the core and the second overlapping area onto the outer circumferential surface of the core are spaced apart. That is, the first overlapping area and the second overlapping area are completely misaligned to further reduce the risk of adhesive scraping during the core insertion process, thereby ensuring the subsequent welding effect of the shell.

[0017] In one embodiment, the thickness of the fixing adhesive tape is less than or equal to the thickness of the insulating adhesive tape. By selecting fixing adhesive tape with a thickness less than that of the insulating adhesive tape, the potential impact of the fixing adhesive tape on the outer casing can be minimized, thereby ensuring the smooth installation of the core into the casing.

[0018] The beneficial effects of the embodiments of this application are as follows:

[0019] In embodiments of this application, the battery includes a casing, a core, and insulating tape. The casing forms a receiving cavity, and one end of the casing has an opening communicating with the receiving cavity. The core is disposed within the receiving cavity and includes a first end and a second end opposite to each other. The insulating tape is disposed on the outer peripheral surface of the core and is used to separate the tabs of the core from the sidewall of the casing. The insulating tape extends from the first end to the second end. By providing insulating tape on the outer peripheral surface of the core and using the insulating tape to separate the tabs of the core from the sidewall of the casing, this application can avoid short circuits between the tabs of the core and the sidewall of the casing. By setting the insulating tape to extend from the first end to the second end, when assembling the core and the casing, the portion of the insulating tape extending from the first end to the second end can be used to insert the core into the receiving cavity of the casing through the opening along the sidewall of the casing, thereby reducing the risk of scratching between the sidewall of the casing and the insulating tape. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of a battery assembly process provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram illustrating the interaction between insulating adhesive paper and fixing adhesive paper, provided in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of an insulating adhesive paper-covered core provided in an embodiment of this application;

[0024] Figure 4 These are schematic diagrams illustrating different schemes for covering the ends of the core with insulating adhesive tape according to embodiments of this application;

[0025] Figure 5 This is a schematic diagram of different structures of fixing adhesive paper attached to the winding end of the core provided in the embodiments of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Battery; 11. Casing; 111. Receiving cavity; 112. Opening; 12. Core; 121. First end; 122. Second end; 123. Winding tail end; 13. Insulating tape; 131. First covering part; 1311. First overlapping area; 1312. Second overlapping area; 132. Second covering part; 133. Third covering part; 14. Fixing tape;

[0028] 2. Mold head; 21. First positioning hole; 22. Second positioning hole. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0030] This application provides a battery; please refer to [link / reference]. Figure 1The battery 1 includes a casing 11 and a winding core 12. The casing 11 forms a receiving cavity 111, and one end of the casing 11 has an opening 112 communicating with the receiving cavity 111. The winding core 12 is disposed in the receiving cavity 111 and includes a first end 121 and a second end 122 opposite to each other. That is, the first end 121 or the second end 122 of the winding core 12 enters the receiving cavity 111 of the casing 11 through the opening 112 to realize the assembly of the winding core 12 and the casing 11.

[0031] Battery 1 includes insulating tape 13, which is disposed on the outer peripheral surface of core 12. The insulating tape 13 is used to separate the tabs of core 12 from the sidewalls of casing 11. Core 12 is wound from a positive electrode, a negative electrode, and a separator. After winding, tabs are formed at the first end 121 and the second end 122 of core 12 to facilitate the electrical connection design of core 12. When core 12 is assembled into casing 11, there is a risk that the tabs exposed at both ends of core 12 may come into contact with the sidewalls of casing 11. By providing insulating tape 13 on the outer peripheral surface of core 12 and using insulating tape 13 to separate the tabs of core 12 from the sidewalls of casing 11, direct contact between the tabs of core 12 and the sidewalls of casing 11 can be effectively avoided, thus ensuring the stability of the overall structure of battery 1.

[0032] The insulating tape 13 extends from the first end 121 to the second end 122, meaning the insulating tape 13 includes a portion that continuously extends from the first end 121 to the second end 122. When inserting the core 12 into the shell, the shell insertion die 2 can be used to position the shell 11 and the core 12. The die 2 is provided with a first positioning hole 21 and a second positioning hole 22 that are interconnected. The first positioning hole 21 is used to insert one end of the opening 112 of the shell 11 to position the shell 11. The second positioning hole 22 is used to insert the insertion end of the core 12 to position the core 12.

[0033] Since the outer diameter of the core 12 is smaller than the inner diameter of the outer shell 11, the diameter of the second positioning hole 22 is smaller than the diameter of the first positioning hole 21. This allows the core 12 to smoothly pass through the first positioning hole 21 and enter the receiving cavity 111 of the outer shell 11 under the positioning action of the second positioning hole 22. By setting the insulating tape 13 to extend from the first end 121 to the second end 122, when assembling the core 12 and the outer shell 11, the portion of the insulating tape 13 extending from the first end 121 to the second end 122 can be used to insert the core 12 into the receiving cavity 111 of the outer shell 11 through the opening 112 along the side wall of the outer shell 11. This reduces the risk of adhesive scraping between the side wall of the outer shell 11 and the insulating tape 13, thereby ensuring the welding effect of the outer shell 11 in the subsequent welding process.

[0034] It should be noted that by setting the insulating tape 13 to extend from the first end 121 to the second end 122, the portion of the insulating tape 13 that extends continuously from the first end 121 to the second end 122 will not form a height difference with the outer circumferential surface of the core 12 in the direction of core 12 entering the shell, and thus will not form a stepped structure. Therefore, when the core 12 is inserted into the shell, if the portion of the insulating tape 13 extending from the first end 121 to the second end 122 is used to insert the core 12 into the receiving cavity 111 of the shell 11 through the opening 112 along the side wall of the shell 11, the side wall of the shell 11 will not be scraped by the step structure, and the adhesive will not remain on the side wall of the shell 11, thus affecting the subsequent welding of the shell 11.

[0035] The battery 1 in this embodiment includes a casing 11, a core 12, and insulating tape 13. The casing 11 forms a receiving cavity 111, and one end of the casing 11 is provided with an opening 112 communicating with the receiving cavity 111. The core 12 is disposed in the receiving cavity 111 and includes a first end 121 and a second end 122 opposite to each other. The insulating tape 13 is disposed on the outer peripheral surface of the core 12 and is used to separate the tabs of the core 12 from the side wall of the casing 11. The insulating tape 13 extends from the first end 121 to the second end 122. This application provides insulating tape 13 on the outer periphery of the core 12, which separates the tabs of the core 12 from the sidewall of the housing 11, thus preventing short circuits between the tabs of the core 12 and the sidewall of the housing 11. By setting the insulating tape 13 to extend from the first end 121 to the second end 122, when assembling the core 12 and the housing 11, the portion of the insulating tape 13 extending from the first end 121 to the second end 122 can be used to insert the core 12 into the receiving cavity 111 of the housing 11 through the opening 112 along the sidewall of the housing 11, thereby reducing the risk of adhesive scraping between the sidewall of the housing 11 and the insulating tape 13.

[0036] In some embodiments, please refer to Figure 2 The orthographic projection of the insulating tape 13 onto the outer peripheral surface of the core 12 covers the outer peripheral surface of the core 12, meaning that the insulating tape 13 completely covers the outer peripheral surface of the core 12. This ensures that there is no height difference between the insulating tape 13 and the outer peripheral surface of the core 12, thus preventing the formation of a step structure. This further reduces the risk of adhesive scraping between the side wall of the outer shell 11 and the insulating tape 13 during the process of inserting the core 12 into the shell, thereby ensuring the welding effect of the outer shell 11 in the subsequent welding process.

[0037] In some cases, the insulating tape 13 may also be partially perforated to expose the outer periphery of the core 12, allowing the electrolyte inside the battery 1 to penetrate into the core 12 through the outer periphery of the core 12, thereby improving the wetting effect of the electrolyte and improving the overall electrical performance of the battery 1.

[0038] It should be noted that when the insulating tape 13 is partially perforated, the insulating tape 13 still has a portion extending from the first end 121 to the second end 122. That is, the perforated portion cannot extend in a ring along the circumference of the core 12 to completely separate the insulating tape 13 between the first end 121 and the second end 122, so as to ensure that the risk of adhesive scraping between the side wall of the outer shell 11 and the insulating tape 13 is low during the process of the core 12 being inserted into the shell.

[0039] In some embodiments, please refer to Figure 2 The insulating tape 13 includes a first covering portion 131 disposed on the outer peripheral surface of the core 12. The first covering portion 131 partially overlaps to form a first overlapping area 1311, which extends along the axial direction of the core 12. That is, when the insulating tape 13 is disposed on the outer peripheral surface of the core 12, in order to ensure the adhesion stability of the insulating tape 13, the insulating tape 13 will partially overlap after wrapping around the outer peripheral surface of the core 12 once. This overlapping portion is the first overlapping area 1311.

[0040] In this configuration, along the circumference of the core 12, the width TI of the first overlapping area 1311 and the perimeter L1 of the outer surface of the core 12 satisfy the following relationship: 0.5mm ≤ T1 ≤ 1 / 4L1. If the width of the first overlapping area 1311 is too small, the adhesion stability of the insulating tape 13 will be poor; if the width of the first overlapping area 1311 is too large, the area with double-layer insulating tape 13 on the outer surface of the core 12 will be too large, resulting in excessive space occupation of the insulating tape 13, which is detrimental to the energy density design of the battery 1. By setting the width TI of the first overlapping area 1311 and the perimeter L1 of the outer surface of the core 12 to 0.5mm ≤ T1 ≤ 1 / 4L1, the adhesion stability of the insulating tape 13 can be ensured while avoiding excessive space occupation of the insulating tape 13.

[0041] In the actual manufacturing process, the width TI of the first overlapping area 1311 can be set to 0.5mm, 0.8mm or 1mm, etc., or the ratio TI / L1 of the width TI of the first overlapping area 1311 to the perimeter L1 of the outer circumference of the core 12 can be set to 1 / 8, 1 / 6 or 1 / 4, etc. The specific width value of the first overlapping area 1311 can be selected and adjusted according to the actual design requirements, and no special limitation is made here.

[0042] In some embodiments, the first end 121 of the core 12 is used to be inserted into the receiving cavity 111 through the opening 112, and the insulating tape 13 partially covers the end face of the first end 121. That is, the first end 121 is the insertion end of the core 12. By partially covering the end face of the first end 121 with the insulating tape 13, when the insulating tape 13 is disposed on the outer peripheral surface of the core 12 and covers the tab of the core 12, it can be partially folded toward the end face of the first end 121 and partially cover the end face of the first end 121. This allows the insulating tape 13 to fully wrap the edge of the first end 121, thereby ensuring that the insulating tape 13 fully covers the tab of the first end 121 and further reducing the risk of the insulating tape 13 scraping against the edge of the first end 121 on the side wall of the outer casing 11 when the core 12 is inserted into the casing.

[0043] In some examples, please refer to Figure 3 and Figure 4 The insulating tape 13 includes a second covering portion 132 disposed on the end face of the first end 121. The width T2 of the second covering portion 132 in the radial direction along the core 12 satisfies the relationship: T2 ≥ 1.5 mm. If the width T2 of the second covering portion 132 is too small, the insulating tape 13 will not be able to stably cover the edge of the first end 121. On the one hand, this may affect the insulation effect of the insulating tape 13 on the tab of the first end 121 and the side wall of the outer casing 11; on the other hand, it may cause the side wall of the outer casing 11 to scrape against the insulating tape 13 at the edge of the first end 121. By setting the width T2 of the second covering portion 132 to T2 ≥ 1.5 mm, the stable covering of the edge of the first end 121 by the insulating tape 13 can be ensured, thus ensuring the insulation effect of the insulating tape 13 on the tab of the first end 121 and the side wall of the outer casing 11, and reducing the risk of the side wall of the outer casing 11 scraping against the insulating tape 13 at the edge of the first end 121.

[0044] In the actual manufacturing process, the width T2 of the second covering part 132 can be set to 1.5mm, 1.8mm or 2.0mm, etc. The specific value of its width can be selected and adjusted according to the actual design requirements, and no special limitation is made here.

[0045] In some examples, please refer to Figure 4The insulating tape 13 includes a third covering portion 133 that partially covers the end face of the second end 122. The width T3 of the third covering portion 133 along the radial direction of the core 12 satisfies the relationship: T2 ≥ 1.5 mm. If the width T3 of the third covering portion 133 is too small, the insulating tape 13 will not be able to stably cover the edge of the second end 122, thus affecting the insulation effect of the insulating tape 13 on the tab of the first end 121 and the sidewall of the outer casing 11. By setting the width T3 of the third covering portion 133 to T3 ≥ 1.5 mm, the stable covering of the edge of the second end 122 by the insulating tape 13 can be ensured, thus ensuring the insulation effect of the insulating tape 13 on the tab of the second end 122 and the sidewall of the outer casing 11.

[0046] In the actual manufacturing process, the width T3 of the third covering part 133 can be set to 1.5mm, 1.8mm or 2.0mm, etc. The specific value of its width can be selected and adjusted according to the actual design requirements, and no special limitation is made here.

[0047] In some embodiments, please refer to Figure 2 The battery 1 also includes a fixing tape 14, which is attached to the winding tail end 123 of the core 12. Insulating tape 13 covers the fixing tape 14. The core 12 is formed by winding a positive electrode, a negative electrode, and a separator. At the end of winding, the positive electrode, negative electrode, and separator are cut using a cutter. At this point, fixing tape 14 needs to be attached to the winding tail end 123 of the core 12 to secure it and prevent it from unraveling. By setting the insulating tape 13 to cover the fixing tape 14, the insulating tape 13 can also serve the same function of securing the fixing tape 14. This arrangement makes the structure and attachment method of the fixing tape 14 more flexible and convenient.

[0048] In some examples, the insulating tape 13 includes a first covering portion 131 disposed on the outer peripheral surface of the core 12. The first covering portion 131 partially overlaps to form a first overlapping area 1311. The first covering portion 131 covers the fixing tape 14 and forms a second overlapping area 1312 with the fixing tape 14. That is, when the insulating tape 13 is disposed on the outer peripheral surface of the core 12, in order to ensure the adhesion stability of the insulating tape 13, the insulating tape 13 will partially overlap after wrapping around the outer peripheral surface of the core 12. This overlapping portion is the first overlapping area 1311. In order for the insulating tape 13 to play a fixing role in fixing the tape 14 and to be compatible with different structural types of fixing tape 14, the insulating tape 13 needs to cover the fixing tape 14. The covered area is the second overlapping area 1312.

[0049] The second overlapping area 1312 is at least partially offset from the first overlapping area 1311. Since the first overlapping area 1311 is a region with two layers of insulating tape 13, and the second overlapping area 1312 is a region with both fixing tape 14 and insulating tape 13, if the second overlapping area 1312 overlaps with the first overlapping area 1311, it would result in four layers of tape, forming a large protrusion. During the insertion of the core 12 into the casing, this protrusion could interfere with the sidewall of the casing 11, causing the casing 11 to scratch the protrusion and scrape the tape, thus affecting the subsequent welding effect of the casing 11. By setting the second overlapping area 1312 to be at least partially offset from the first overlapping area 1311, the risk of the second overlapping area 1312 overlapping with the first overlapping area 1311 causing the casing to scrape the tape during the insertion of the core 12 is reduced, thereby ensuring the subsequent welding effect of the casing 11.

[0050] In some examples, the orthographic projection of the first overlapping area 1311 on the outer peripheral surface of the core 12 and the orthographic projection of the second overlapping area 1312 on the outer peripheral surface of the core 12 are set at intervals, that is, the first overlapping area 1311 and the second overlapping area 1312 are completely misaligned, so as to further reduce the risk of adhesive scraping of the outer shell 11 during the process of core 12 being inserted into the shell, thereby ensuring the subsequent welding effect of the outer shell 11.

[0051] In some cases, the thickness of the fixing tape 14 is less than or equal to the thickness of the insulating tape 13. When setting the insulating tape 13, in order for the insulating tape 13 to serve the fixing function of the fixing tape 14 and to be compatible with different structural types of fixing tape 14, the insulating tape 13 needs to cover the fixing tape 14. This may result in a protrusion at the location where the insulating tape 13 covers the fixing tape 14. The formation of this protrusion creates a height difference and a step on the outer periphery of the insulating tape 13, which may cause the outer casing 11 to scrape the tape at the location corresponding to the protrusion during the installation of the core 12. The height of this protrusion is directly related to the thickness of the fixing tape 14. By selecting a fixing tape 14 with a thickness less than that of the insulating tape 13, the potential impact of the fixing tape 14 on the scraping of the outer casing 11 can be minimized, thereby ensuring the smooth installation of the core 12.

[0052] It should be noted that choosing a thinner fixing tape 14 may result in a poorer fixing effect of the fixing tape 14 on the winding tail end 123 of the core 12. However, the setting of the insulating tape 13 can also play the fixing role of the fixing tape 14, so that the setting of the insulating tape 13 can effectively make up for this defect, thereby effectively ensuring the structural stability of the core 12, and thus ensuring the overall performance stability of the battery 1.

[0053] Please refer to Figure 5The fixing tape 14 can completely cover the outer circumferential surface of the core 12 except for the area of ​​the two end tabs, so as to completely cover the winding tail end 123 of the core 12; or, the fixing tape 14 can be arranged in multiple strips, each fixing tape 14 wrapping around the core 12 circumferentially, and the multiple fixing tapes 14 are spaced apart along the axial direction of the core 12; or, the fixing tape 14 can be arranged in multiple island-shaped structures, each island-shaped fixing tape 14 only needs to be pasted at the winding tail end 123 of the core 12, and the multiple fixing tapes 14 are spaced apart along the axial direction of the core 12; or, the cutting edge of the fixing tape 14 can be serrated or inclined, and different cutting edge shapes correspond to different cutting tools. Since the fixing tape 14 can be covered when the insulating tape 13 is set, the embodiments of this application can be compatible with different structural types of fixing tape 14, and the specific structure of the fixing tape 14 is not particularly limited.

[0054] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized in that, include: The outer shell has a receiving cavity, and one end of the outer shell has an opening communicating with the receiving cavity; A core is disposed within the receiving cavity, the core comprising a first end and a second end opposite to each other; Insulating tape is disposed on the outer peripheral surface of the core, the insulating tape being used to separate the tabs of the core from the sidewall of the outer casing, the insulating tape extending from the first end to the second end.

2. The battery according to claim 1, characterized in that, The orthographic projection of the insulating tape onto the outer circumferential surface of the core covers the outer circumferential surface of the core.

3. The battery according to claim 1, characterized in that, The insulating adhesive paper includes a first covering portion disposed on the outer peripheral surface of the core. The first covering portion partially overlaps to form a first overlapping area, which extends along the axial direction of the core. In the circumferential direction of the core, the width T1 of the first overlapping area and the perimeter L1 of the outer peripheral surface of the core satisfy the relationship: 0.5mm≤T1≤1 / 4L1.

4. The battery according to claim 1, characterized in that, The first end is used to be inserted into the receiving cavity through the opening, and the insulating tape partially covers the end face of the first end.

5. The battery according to claim 4, characterized in that, The insulating adhesive paper includes a second covering portion disposed on the first end face. In the radial direction along the core, the width T2 of the second covering portion satisfies the relationship: T2≥1.5mm.

6. The battery according to claim 4, characterized in that, The insulating tape includes a third covering portion that partially covers the second end face; the width T3 of the third covering portion in the radial direction of the core satisfies the relationship: T3≥1.5mm.

7. The battery according to any one of claims 1 to 6, characterized in that, The battery also includes a fixing adhesive tape, which is attached to the winding end of the core, and an insulating adhesive tape covers the fixing adhesive tape.

8. The battery according to claim 7, characterized in that, The insulating adhesive tape includes a first covering portion disposed on the outer peripheral surface of the core, the first covering portion partially overlaps and forms a first overlapping area; the first covering portion covers the fixing adhesive tape and forms a second overlapping area with the fixing adhesive tape, the second overlapping area being at least partially offset from the first overlapping area.

9. The battery according to claim 8, characterized in that, The orthographic projection of the first overlapping area on the outer peripheral surface of the core and the orthographic projection of the second overlapping area on the outer peripheral surface of the core are spaced apart.

10. The battery according to claim 7, characterized in that, The thickness of the fixing adhesive tape is less than or equal to the thickness of the insulating adhesive tape.

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