Battery cell structure and roll core battery

Abstract

The utility model relates to a battery core structure and a roll core battery. The battery cell structure comprises a roll core and ending adhesive paper, the roll core is provided with a secondary outer pole piece layer and an outermost pole piece layer, and the ending adhesive paper is attached to the secondary outer pole piece layer and the outermost pole piece layer at the same time, so that the tail end of the outermost pole piece layer is fixed to the outer side of the secondary outer pole piece layer; the battery cell structure further comprises a bonding sheet; the bonding sheet is arranged between the secondary outer pole piece layer and the outermost pole piece layer, and the bonding sheet is overlapped with one end of the ending gummed paper. According to the scheme provided by the invention, the fixation of the tail end of the roll core can be effectively enhanced, the tearing damage of the roll core is reduced, and the overall performance and safety of the battery are further effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a core structure and a wound-core battery. Background Art

[0002] In the portable intelligent terminal industry, the requirements for the anti-drop performance of batteries are becoming increasingly strict. Especially for intelligent terminals using soft-pack batteries, such as smart phones.

[0003] In the prior art, hot melt adhesive is provided at the end of the core to bond the wound core and the aluminum-plastic film wrapped outside the wound core, preventing the wound core from shaking in the aluminum-plastic film. However, when the core formed by this bonding method is subjected to a drop impact, the wound core will be torn. Summary of the Utility Model

[0004] To solve or partially solve the problems existing in the related art, this application provides a core structure and a wound-core battery, which can effectively enhance the fixation of the end of the wound core, reduce the tearing and breakage of the wound core, and thus effectively improve the overall performance and safety of the battery.

[0005] In the first aspect of this application, a core structure is provided, including: a wound core and a finishing adhesive tape. The wound core has a sub-outer pole piece layer and an outermost pole piece layer. The finishing adhesive tape is simultaneously attached to the sub-outer pole piece layer and the outermost pole piece layer, so that the end of the outermost pole piece layer is fixed outside the sub-outer pole piece layer. The core structure further includes: an adhesive sheet;

[0006] The adhesive sheet is disposed between the sub-outer pole piece layer and the outermost pole piece layer, and one end of the adhesive sheet overlaps with the finishing adhesive tape.

[0007] In some embodiments, the wound core is formed by winding a first pole piece, a second pole piece, and a separator. The sub-outer pole piece layer and the outermost pole piece layer are led out from the end of the first pole piece and connected in sequence.

[0008] In some embodiments, the first pole piece has opposite short film sides and long film sides. The adhesive sheet is disposed on the short film side or the long film side of the first pole piece, and the adhesive sheet is bonded to the other side when the first pole piece, the second pole piece, and the separator are wound to form a wound core.

[0009] In some embodiments, a first bonding area is provided on the short film side, and a second bonding area corresponding to the first bonding area is provided on the long film side. The adhesive sheet is disposed in the first bonding area or the second bonding area; wherein the second bonding area is close to the end of the first pole piece.

[0010] In some embodiments, the adhesive sheet is flush with the end of the outermost pole piece layer.

[0011] In some embodiments, the overlapping width of the adhesive sheet and the outermost electrode sheet layer is 30% to 40% of the width of the core.

[0012] In some embodiments, the overlapping length of the adhesive sheet and the outermost electrode sheet layer is slightly less than the width of the first electrode sheet.

[0013] In some embodiments, the adhesive sheet is provided with an anti-overflow area.

[0014] In some embodiments, the adhesive sheet is a hot melt adhesive.

[0015] In some embodiments, the battery cell structure further includes:

[0016] A finishing adhesive tape adhered to the core, one end of the finishing adhesive tape overlapping with the first electrode sheet and the adhesive sheet.

[0017] A second aspect of the present application provides a core battery, including the battery cell structure described in the first aspect of the present application.

[0018] The technical solution provided by the present application may include the following beneficial effects:

[0019] In the battery cell structure of the present application, by providing an adhesive sheet on the first electrode sheet and adhering the end of the core to the outside of the core through the adhesive sheet, the fixing property of the end of the core is effectively enhanced. When subjected to an external impact, such as during a drop, the adhesive sheet can effectively absorb and disperse the impact force, preventing the stress from being too concentrated and causing the core to tear and break, thereby effectively improving the overall performance and safety of the battery.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0022] Figure 1 is a schematic structural diagram of the battery cell structure shown in the embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the bonding position of the adhesive sheet in the battery cell structure shown in the embodiment of the present application;

[0024] Figure 3 is another schematic diagram of the bonding position of the adhesive sheet in the battery cell structure shown in the embodiment of the present application;

[0025] Figure 4 It is a schematic structural diagram of the bonding sheet in the battery cell structure shown in the embodiments of the present application.

[0026] Reference numerals: 100, winding core; 110, sub-outer electrode layer; 120, outermost electrode layer; 200, end sealing tape; 300, bonding sheet; 310, anti-overflow area; 400, first electrode; 410, short film side; 420, long film side; 500, second electrode; 600, separator. Detailed embodiments

[0027] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0028] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined. It should also be understood that the term "and / or" used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation of the present application.

[0030] Unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral body; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the related art, usually a layer of highly viscous adhesive is added on one side of the original finishing hot melt adhesive of the battery cell to balance the adhesive force between the wound core and the aluminum-plastic film, so as to improve the stability of the wound core in the battery. However, in the above method of adding adhesive, due to the large force concentrated at the pasting edge position, the battery cell is prone to tearing under drop impact, which in turn affects the overall performance and safety of the battery.

[0032] In view of the above problems, the embodiment of this application provides a battery cell structure, which can effectively enhance the fixation of the tail end of the wound core, reduce the tearing and breakage of the wound core, and thus effectively improve the overall performance and safety of the battery.

[0033] The technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] Figure 1 It is a schematic structural diagram of the battery cell structure shown in the embodiment of this application.

[0035] See Figure 1 , the battery cell structure of this application includes: a wound core 100, a finishing adhesive tape 200, and an adhesive sheet 300. The wound core 100 has a sub-outer electrode layer 110 and an outermost electrode layer 120. It can be understood that the outermost electrode layer 120 wraps around the outside of the sub-outer electrode layer 110. The finishing adhesive tape 200 is simultaneously attached to the sub-outer electrode layer 110 and the outermost electrode layer 120, so that the tail end of the outermost electrode layer 120 is fixed to the outside of the sub-outer electrode layer 110. The finishing adhesive tape 200 can provide insulation protection for the wound core 100 to prevent short circuit between the positive and negative electrodes of the wound core. Moreover, the finishing adhesive tape 200 is also used to provide a fixing effect between the wound core 100 and the aluminum-plastic film, so as to ensure the stability of the battery cell during application. The adhesive sheet 300 is disposed between the sub-outer electrode layer 110 and the outermost electrode layer 120, and one end of the adhesive sheet 300 overlaps with the finishing adhesive tape 200. It can be understood that the adhesive area of the adhesive sheet 300 covers the end of the finishing adhesive tape 200 that is pasted to the tail end of the wound core 100.

[0036] In the core structure of the present application, the position where the bonding sheet 300 provides adhesion to the end of the wound core 100 corresponds to one end of the end sealing tape 200 pasted to the end of the wound core 100. During the dropping process, the adhesion provided by the bonding sheet 300 can effectively counteract the tearing force generated by the end sealing tape 200 on the end of the wound core 100, thereby reducing the occurrence probability of damage to the end of the wound core 100.

[0037] In some embodiments, the wound core 100 can be formed by winding a first pole piece 400, a second pole piece 500, and a separator 600. The second outermost pole piece layer 110 and the outermost pole piece layer 120 are led out from the end of the first pole piece 400 and connected in sequence. The first pole piece 400, the second pole piece 500, and the separator 600 are arranged in a stacked manner. The separator 600 is mainly used to isolate the first pole piece 400 and the second pole piece 500 to avoid short circuit caused by contact between the first pole piece 400 and the second pole piece 500.

[0038] Figure 2 It is a schematic diagram of the bonding position of the bonding sheet in the core structure shown in the embodiment of the present application; Figure 3 It is another schematic diagram of the bonding position of the bonding sheet in the core structure shown in the embodiment of the present application.

[0039] See together Figure 2 and Figure 3 , in some embodiments, the first pole piece 400 has opposite short film sides 410 and long film sides 420. Generally, active material layers are provided on both sides of the pole piece, and the active material layers on both sides have different lengths. The short film side 410 can refer to the side of the first pole piece 400 where the length of the active material layer is shorter, and the long film side 420 can refer to the side of the first pole piece 400 where the length of the active material layer is longer. The bonding sheet 300 can be disposed on the short film side 410 or the long film side 420 of the first pole piece 400, that is, the bonding sheet 300 can be pasted on the short film side 410 or the long film side 420, and the bonding sheet 300 is bonded to the other side when the first pole piece 400, the second pole piece 500, and the separator 600 are wound to form the wound core 100. That is, the bonding sheet 300 can be disposed on either side of the two sides of the first pole piece 400, and during the winding process, when the winding ends, the bonding sheet 300 is bonded to the other side of the first pole piece 400 from the side (short film side 410 or long film side 420) where it is initially pasted. As Figure 1 shown, the bonding sheet 300 is disposed on the short film side 410 of the first pole piece 400, and as Figure 2 shown, the bonding sheet 300 is disposed on the long film side 420 of the first pole piece 400.

[0040] In some embodiments, a first bonding area is provided on the side surface 410 of the short film, and a second bonding area corresponding to the first bonding area is provided on the side surface 420 of the long film. When the bonding sheet 300 is disposed on the first pole piece 400, it can be first pasted on the first bonding area or the second bonding area. The second bonding area is close to the end of the first pole piece. By providing specific bonding areas on both side surfaces of the first pole piece 400, the bonding position of the bonding sheet 300 can be controlled, and the process flow of disposing the bonding sheet 300 on the first pole piece 400 can be made more flexible; moreover, by making one of the bonding areas close to the end of the first pole piece 400, the bonding sheet 300 is effectively disposed close to the end of the core 100, thereby improving the protection effect provided by the bonding sheet 300 to the core. In some embodiments, the bonding sheet 300 can be pasted on the first pole piece 400 before the winding process. It can be understood that sticking the bonding sheet 300 on the first pole piece 400 before winding facilitates process implementation and reduces production costs, that is, reduces the addition of a gluing process in the winding or subsequent processes to implement the sticking of the bonding sheet 300. In addition, the bonding sheet 300 is stuck before winding, effectively avoiding an adverse impact on the winding effect of the core 100. Among them, the winding process is a process with a relatively high defect rate. Sticking the bonding sheet 300 before the winding process effectively reduces the impact on the yield rate of the winding process and reduces the impact on the winding efficiency. In some specific embodiments, the core 100 can be formed by winding a five-layer structure in which the separator 600, the first pole piece 400, the separator 600, the second pole piece 500, and the separator 600 are stacked in sequence. The winding process is to wind the stacked separator 600, first pole piece 400, separator 600, second pole piece 500, and separator 600 from one end to the other end, such as winding along the length direction of the feed. Specifically, the winding process can be implemented by using an automatic winding device of related technologies, which is not limited herein.

[0041] In some embodiments, the polarities of the first pole piece 400 and the second pole piece 500 are opposite, that is to say, one of the first pole piece 400 and the second pole piece 500 is a positive pole piece, and the other of the first pole piece 400 and the second pole piece 500 is a negative pole piece. Preferably, in the present application, the first pole piece 400 is a positive pole piece and the second pole piece 500 is a negative pole piece.

[0042] In the cell structure of the present application, by providing the bonding sheet 300 on the corresponding pole piece, when the core 100 is formed, the bonding sheet 300 provides a bonding force to the end of the core 100, so that during the dropping process, the bonding force provided by the bonding sheet 300 counteracts or provides assistance to the tearing force of the end sealing tape on the end of the core 100, thereby preventing the aluminum foil at the end of the core 100 from being damaged or broken, improving the overall performance and safety of the battery, and effectively increasing the passing rate of the drop test of the battery.

[0043] In some embodiments, the adhesive sheet 300 may use hot melt adhesive. Specifically, when the hot melt adhesive is heated to a certain temperature, it will be activated and melted into a liquid state, and will form a firm bond after cooling and solidifying. In addition, the hot melt adhesive has a certain adhesive force before activation. In this way, when the adhesive sheet 300 uses hot melt adhesive, it can achieve bonding and fixing of the tail end of the core 100 during the winding process. When the core is encapsulated in the aluminum-plastic film and undergoes high-temperature formation, the adhesive sheet 300 can be activated and melted, and will solidify after cooling, so that the adhesive sheet 300 effectively fills into the core 100 to form a uniform and firm bonding layer, thereby providing a more effective bonding effect on the tail end of the core 100, and can make the bonding layer formed by the adhesive sheet 300 at the tail end of the core 100 have a better effect of absorbing and dispersing impact force, further preventing the tail end of the core 100 from being torn due to the tearing force generated by the adhesive between the core and the aluminum-plastic film during the falling process. In some specific embodiments, the hot melt adhesive used by the adhesive sheet 300 may be one of polyethylene hot melt adhesive, polypropylene hot melt adhesive, ethylene-vinyl acetate copolymer hot melt adhesive (EVA), styrene block copolymer hot melt adhesive (SBS), polyester hot melt adhesive (PES), polyamide hot melt adhesive (PA), polyurethane hot melt adhesive (PU), polyolefin hot melt adhesive (PO), and there is no limitation here. Further, the activation temperature of the hot melt adhesive used by the adhesive sheet 300 may be above 80°C to adapt to the temperature during the high-temperature formation of the battery, and further ensure the bonding effect of the adhesive sheet 300.

[0044] In some embodiments, the adhesive sheet 300 is flush with the tail end of the outermost electrode layer 120. That is to say, the adhesive sheet 300 is arranged flush with the end face of the outermost electrode layer 120 along the length direction of the first electrode 400. In this way, it can prevent the adhesive sheet 300 from exceeding the outermost electrode layer 120 and affecting the subsequent process of pasting the end seal tape 200. For example, it can prevent the adhesive sheet 300 from becoming thinner after activation and melting, resulting in a large gap between the end seal tape 200 and the outermost electrode layer 120, and further ensure the overall performance of the cell structure. Of course, an allowable error value can also be set to reduce the pasting difficulty of the adhesive sheet 300 while ensuring the performance of the cell structure, and there is no limitation here.

[0045] In some embodiments, the overlapping width W0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 is 30% to 40% of the width W1 of the core 100. It can be understood that the area of the adhesive sheet 300 affects the adhesion effect between it and the first electrode sheet 400. When the area of the adhesive sheet 300 is too small, the adhesive force provided by it will not be sufficient to firmly fix the core 100, which may lead to the risk of loosening or falling off during the use of the battery, affecting the performance and safety of the battery. On the contrary, if the area of the adhesive sheet 300 is too large, although it can provide a stronger adhesive force, it will result in excessive consumption of raw materials and increase the production cost. By setting the overlapping width W0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 to 30% to 40% of the width W1 of the core 100, it can ensure that the adhesive sheet 300 forms a sufficient bonding area at the end of the core 100, and at the same time can minimize the waste of materials and reduce the production cost.

[0046] Figure 4 It is a schematic structural diagram of the adhesive sheet in the core structure shown in the embodiments of the present application.

[0047] See also Figure 4 , in some embodiments, the overlapping length L0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 is slightly less than the width W3 of the first electrode sheet. It can be understood that the overlapping length L0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 being slightly less than the width W3 of the first electrode sheet 400 can mean that the overlapping length L0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 is slightly smaller than the width W3 of the first electrode sheet 400 by a certain distance. For example, the overlapping length L0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 is slightly less than the width W3 of the first electrode sheet 400 by a tolerance distance value of -1 mm, to prevent the overlapping length L0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 from being too long and squeezing the core 100, and at the same time prevent the overlapping length L0 of the adhesive sheet 300 and the outermost electrode sheet layer 120 from being set too small, resulting in more blank areas between the edge of the adhesive sheet 300 and the edge of the outermost electrode sheet layer 120, causing the outermost electrode sheet layer 120 to fold and break, thereby further improving the stability of the core structure.

[0048] In still some other embodiments, the adhesive sheet 300 is provided with an anti-overflow area 310. The anti-overflow area 310 can be provided with anti-overflow notches such as wavy or serrated shapes. By using the anti-overflow notches provided in the anti-overflow area 310, the adhesive sheet 300 can flow along a preset path after melting during the high-temperature formation process of the battery, thereby playing an anti-overflow glue role and avoiding the influence of the adhesive sheet 300 on the performance of the core structure.

[0049] To better illustrate the present application, the batteries of the present application are described below by way of Example 1 and Example 2. Among them, Example 1 is a battery with a cell structure in which the bonding sheet 300 is disposed in the single-sided area (i.e., the first bonding area) of the short film side 410 of the first electrode sheet 400, and Example 2 is a battery with a cell structure in which the bonding sheet 300 is disposed in the empty foil area (i.e., the second bonding area) of the long film side 420 of the first electrode sheet 400. An existing battery with a cell structure without the bonding sheet 300 is used as Comparative Example 1 for a drop performance test, and the test results of each example and Comparative Example 1 are observed and recorded. Table 2 shows the test results of each example and Comparative Example 1.

[0050] The test method is as follows: The battery is charged at a constant current and constant voltage of 0.5C to 4.48V and cut off at 0.05C, and the battery is freely dropped from a height of 1m (3.28 feet) onto a cement floor. Specifically, each battery will be dropped once in the positive and negative directions along three mutually perpendicular axes, for a total of 6 drops, and then left to stand and observe for 1 hour in a temperature environment of 25±2°C. A total of 10 pcs of batteries are tested. The passing standard is: no explosion and no fire.

[0051] Table 2: Test result table of the drop performance test of each example and Comparative Example 1

[0052]

[0053] It can be seen from the above table that for Comparative Example 1, Examples 1 and 2 effectively improve the passing rate of the battery in the drop performance test. It shows that the cell structure of the present application can effectively improve the overall performance and safety of the battery, and improve the passing rate of the battery applying the cell structure of the present application in the drop performance test.

[0054] In this embodiment, in the cell structure of the present application, by disposing a bonding sheet on the first electrode sheet and bonding the tail end of the core to the outside of the core through the bonding sheet, the fixing property of the tail end of the core is effectively enhanced, so that when subjected to an external impact, such as during the dropping process, the bonding sheet can effectively absorb and disperse the impact force, preventing the stress from being too concentrated and causing the core to be torn and damaged, thereby effectively improving the overall performance and safety of the battery.

[0055] Corresponding to the foregoing embodiment of the application function implementation device, the present application also provides a core battery and a corresponding embodiment.

[0056] The battery of the present application includes the cell structure described above in the present application. Among them, by disposing a bonding sheet on the first electrode sheet and bonding the tail end of the core to the outside of the core through the bonding sheet, when subjected to an external impact, such as during the dropping process, it effectively prevents the stress from being too concentrated and causing the core to be torn and damaged, thereby effectively improving the overall performance and safety of the battery.

[0057] The solutions of the present application have been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0058] The various embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skilled in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. A battery cell structure, comprising: A winding core (100) and a finishing tape (200), wherein the winding core (100) has a secondary outer pole sheet layer (110) and an outermost pole sheet layer (120), and the finishing tape (200) is simultaneously attached to the secondary outer pole sheet layer (110) and the outermost pole sheet layer (120) so that the tail end of the outermost pole sheet layer (120) is fixed to the outside of the secondary outer pole sheet layer (110), characterized in that the battery cell structure further comprises: an adhesive sheet (300); The adhesive sheet (300) is arranged between the secondary outer pole sheet layer (110) and the outermost pole sheet layer (120), and the adhesive sheet (300) overlaps with one end of the finishing tape (200).

2. The battery cell structure according to claim 1, characterized in that: The winding core (100) is formed by winding a first pole piece (400), a second pole piece (500) and a diaphragm (600), and the sub-outer pole piece layer (110) and the outermost pole piece layer (120) are led out from the tail end of the first pole piece (400) and are connected in sequence.

3. The battery cell structure according to claim 2, characterized in that: The first pole piece (400) has opposite short film sides (410) and long film sides (420), the adhesive sheet (300) is arranged on the short film side (410) or the long film side (420) of the first pole piece (400), and the adhesive sheet (300) is bonded to the other side when the first pole piece (400), the second pole piece (500) and the diaphragm (600) are wound to form a winding core (100).

4. The battery cell structure according to claim 3, characterized in that: The short film side surface (410) is provided with a first bonding area, the long film side surface (420) is provided with a second bonding area corresponding to the first bonding area, and the bonding sheet (300) is provided in the first bonding area or the second bonding area; The second bonding area is close to the tail end of the first pole piece (400).

5. The battery cell structure according to claim 1, characterized in that: The adhesive sheet (300) is flush with the tail end of the first pole piece (400) of the outermost pole piece layer (120).

6. The battery cell structure according to claim 1, characterized in that: The overlapping width of the adhesive sheet (300) and the first pole piece (400) of the outermost pole piece layer (120) is 30% to 40% of the width of the winding core (100).

7. The battery cell structure according to claim 1, characterized in that: The overlapping length of the adhesive sheet (300) and the first pole piece (400) of the outermost pole piece layer (120) is slightly smaller than the width of the first pole piece (400).

8. The battery cell structure according to claim 1, characterized in that: The adhesive sheet (300) is provided with an anti-overflow area (310).

9. The battery core structure according to any one of claims 1 to 8, characterized in that: The adhesive sheet (300) is hot melt adhesive.

10. A roll core (100) battery, characterized in that: A battery cell structure comprising any one of claims 1 to 9.

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