Battery and battery device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and a battery device, the battery comprises a cylindrical roll core body, the roll core body is formed by winding a pole piece and a diaphragm which are stacked and is provided with a roll core hole, and the pole piece is provided with a first end and a second end which are opposite along the axial direction of the battery; a positive pole lug and a negative pole lug of the pole piece extend out from the first end; wherein the second end is provided with a concave part communicated with the roll core hole, and the size of the concave part in the radial direction of the roll core body is larger than the radial size of the roll core hole. Through the structural design, the hollow part which is communicated with the roll core hole and has a larger radial size is utilized, so that the roll core hole is prevented from being shielded when the diaphragm at the non-tab leading-out end is bent inwards and deformed, the infiltration of electrolyte is ensured, the improvement of the liquid injection efficiency of the battery is facilitated, the liquid injection effect is optimized, and the gas discharge of the non-tab leading-out end is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery device. Background Art

[0002] In the existing design scheme of batteries, when the positive electrode tab and the negative electrode tab of the battery are led out on the same side of the core body, the non-tab lead-out end of the core body is all diaphragm, and the supporting force is weak, and the diaphragm is easy to deform. For example, when the diaphragm generates an inward bending deformation, it will block the liquid injection hole (i.e., the core hole), resulting in the electrolyte being unable to infiltrate, affecting the liquid injection effect of the battery, and further affecting the gas discharge at the non-tab lead-out end. Summary of the Utility Model

[0003] A main object of the utility model is to overcome at least one defect of the above-mentioned prior art, and provide a battery that avoids the diaphragm from blocking the core hole.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, there is provided a battery, which includes a core body. The core body is cylindrical and is formed by winding stacked electrode sheets and diaphragms to form a core hole. Along the axial direction of the battery, the electrode sheet has opposite first and second ends, and the positive electrode tab and the negative electrode tab of the electrode sheet extend from the first end; wherein, a recess communicating with the core hole is provided at the second end, and the size of the recess in the radial direction of the core body is larger than the radial size of the core hole.

[0006] It can be seen from the above technical solutions that the advantages and positive effects of the battery proposed by the utility model are as follows:

[0007] The battery proposed by the utility model includes a cylindrical core body formed by winding stacked electrode sheets and diaphragms to form a core hole. The positive electrode tab and the negative electrode tab are both led out from the same end of the core body. A recess communicating with the core hole is provided at the non-tab lead-out end of the core body, and the size of the recess in the radial direction of the core body is larger than the radial size of the core hole. Through the above structural design, the utility model can utilize the recess communicating with the core hole and having a larger radial size to avoid the diaphragm at the non-tab lead-out end from blocking the core hole when it generates an inward bending deformation, ensure the infiltration of the electrolyte, is beneficial to improving the liquid injection efficiency of the battery, optimizing the liquid injection effect, and further ensuring the gas discharge at the non-tab lead-out end.

[0008] Another main object of the utility model is to overcome at least one defect of the above-mentioned prior art, and provide a battery device adopting the above battery.

[0009] To achieve the above object, the present utility model adopts the following technical solutions:

[0010] According to one aspect of the present utility model, there is provided a battery device, which includes the battery proposed by the present utility model.

[0011] It can be seen from the above technical solutions that the advantages and positive effects of the battery device proposed by the present utility model are as follows:

[0012] For the battery device proposed by the present utility model, by adopting the battery proposed by the present utility model, it is possible to ensure the infiltration of the electrolyte, improve the liquid injection efficiency of the battery, optimize the liquid injection effect, and further ensure the gas discharge at the non-tab lead-out end. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] By considering the following detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings, various objects, features, and advantages of the present utility model will become more apparent. The drawings are only exemplary illustrations of the present utility model and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar components. Among them:

[0014] Figure 1 is a perspective structural view of a battery shown according to an exemplary embodiment;

[0015] Figure 2 is a perspective structural view of the core body of the battery;

[0016] Figure 3 is Figure 2 an enlarged view of part A in

[0017] Figure 4 is a partial axonometric sectional view of the core body;

[0018] Figure 5 is Figure 4 a planar view of the separator shown in the unfolded state;

[0019] Figure 6 is a partial axonometric sectional view of the core body of the battery shown according to another exemplary embodiment;

[0020] Figure 7 is Figure 6 a planar view of the separator shown in the unfolded state;

[0021] Figure 8 is a partial axonometric sectional view of the core body of the battery shown according to still another exemplary embodiment.

[0022] The description of the reference numerals is as follows:

[0023] 100. Housing;

[0024] 200. Core body;

[0025] 201. Core hole;

[0026] 202. Concave part;

[0027] 210. Electrode tab;

[0028] 220. Separator;

[0029] 2201. Separator tape;

[0030] 300. Insulating part;

[0031] 310. Protruding part;

[0032] 311. Through hole;

[0033] a. First end;

[0034] b. Second end;

[0035] d1. Diameter;

[0036] d2. Diameter;

[0037] d3. Inner diameter;

[0038] d4. Hole diameter;

[0039] Δr. Difference value;

[0040] L1. Distance;

[0041] L2. Distance;

[0042] S1. First region;

[0043] S2. Second region;

[0044] X. Axial direction. Detailed implementation mode

[0045] Typical embodiments reflecting the features and advantages of the present utility model will be described in detail in the following description. It should be understood that the present utility model can have various changes in different embodiments, all of which do not depart from the scope of the present utility model, and the descriptions and drawings therein are for illustrative purposes in essence and are not used to limit the present utility model.

[0046] In the following description of different exemplary embodiments of the present utility model, reference is made to the accompanying drawings which form a part of the present utility model and in which are shown, by way of example, different exemplary structures, systems and steps by which various aspects of the present utility model may be implemented. It should be understood that other specific arrangements of components, structures, exemplary devices, systems and steps may be used and structural and functional modifications may be made without departing from the scope of the present utility model. Also, although terms such as "above", "between", "within" etc. may be used in this specification to describe different exemplary features and elements of the present utility model, these terms are used herein for convenience only, for example, in accordance with the orientation of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of the structure to fall within the scope of the present utility model.

[0047] Refer to Figure 1 , which representatively shows a three-dimensional structural schematic diagram of the battery proposed by the present utility model. In this exemplary embodiment, the battery proposed by the present utility model is described by taking the application to in-vehicle batteries as an example. It is easily understood by those skilled in the art that in order to apply the relevant designs of the present utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the following specific embodiments, and these changes are still within the scope of the principle of the battery proposed by the present utility model.

[0048] As Figure 1 shown, in an embodiment of the present utility model, the battery proposed by the present utility model includes a housing 100 and a core body 200. The core body 200 is cylindrical and disposed in the housing 100. Referring in conjunction with Figures 2 to 5 , Figure 2 representatively shows a three-dimensional structural schematic diagram of the core body 200; Figure 3 representatively shows Figure 2 an enlarged schematic diagram of part A in Figure 4 representatively shows a partial axonometric sectional view of the core body 200; Figure 5 representatively shows a planar schematic diagram of the separator 220 in the unfolded state. The structures, connection methods and functional relationships of the main components of the battery proposed by the present utility model will be described in detail below in conjunction with the above-mentioned drawings.

[0049] As Figures 2 to 4As shown, in an embodiment of the present utility model, the core body 200 is formed by winding stacked electrode sheets 210 and separators 220, and a core hole 201 is formed in the middle of the core body 200. The core hole 201 penetrates the core body 200 along the axial direction X of the battery. Along the axial direction X, the electrode sheet 210 has opposite first end a and second end b, and the positive electrode tab and the negative electrode tab of the electrode sheet 210 extend from the first end a, that is, the battery adopts a structural design in which the positive electrode tab and the negative electrode tab are led out on the same side. On this basis, a recess 202 communicating with the core hole 201 is provided at the second end b, and the size of the recess 202 in the radial direction of the core body 200 is larger than the radial size of the core hole 201. Through the above structural design, for a cylindrical battery with the positive and negative electrode tabs led out on the same side, at the non-electrode-tab leading-out end of the core body 200, it is all separator 220, and the supporting force is weak, and the separator 220 is prone to deformation. For example, when the separator 220 generates an inward bending deformation, it will block the liquid injection hole (i.e., the core hole 201), resulting in the electrolyte being unable to infiltrate, affecting the liquid injection effect of the battery, and further affecting the gas discharge at the non-electrode-tab leading-out end. In this regard, the present utility model can utilize the recess 202 connected to the core hole 201 and having a larger radial size to prevent the separator 220 at the non-electrode-tab leading-out end from blocking the core hole 201 when it generates an inward bending deformation, ensuring the infiltration of the electrolyte, being beneficial to improving the liquid injection efficiency of the battery, optimizing the liquid injection effect, and further ensuring the gas discharge at the non-electrode-tab leading-out end.

[0050] It should be noted that the core body 200 is formed by winding after stacking the electrode sheets 210 and the separators 220. The electrode sheets 210 include positive electrode sheets and negative electrode sheets, and the separator 220 is located between the positive electrode sheet and the negative electrode sheet. The separator 220 isolates the electron transfer between the positive electrode sheet and the negative electrode sheet, but can ensure the lithium ion transfer between the positive electrode sheet and the negative electrode sheet. Among them, the material of the positive electrode sheet can be lithium nickel cobalt manganate, lithium iron phosphate, lithium manganese iron phosphate, etc., the material of the negative electrode sheet can be a composition of graphite or silicon carbon, and the material of the separator can be PP or PE.

[0051] Such as Figure 3 and Figure 4As shown, in an embodiment of the present utility model, the second end b of the core body 200 has a first region S1 and a second region S2. The first region S1 is the inner ring region adjacent to the core hole 201, and the second region S2 is the outer ring region adjacent to the first region S1 and relatively far from the core hole 201. Among them, along the axial direction X, the distance L2 between the end of the separator 220 located in the second region S2 away from the electrode sheet 210 and the electrode sheet 210 is greater than the distance L1 between the end of the separator 220 located in the first region S1 away from the electrode sheet 210 and the electrode sheet 210, so that the above-mentioned concave portion 202 is formed at the second end b of the core body 200. On this basis, the separator 220 located in the first region S1 of the core body 200 includes at least two continuously wound turns, and the separator 220 located in the second region S2 includes at least two continuously wound turns.

[0052] As Figure 4 shown, in an embodiment of the present utility model, the distances L1 between the ends of each turn of the separator 220 located in the first region S1 away from the electrode sheet 210 and the electrode sheet 210 are all equal. Accordingly, the axial cross-sectional shape of the concave portion 202 is approximately rectangular. And, the distances L2 between the ends of each turn of the separator 220 located in the second region S2 away from the electrode sheet 210 and the electrode sheet 210 are all equal. With reference to Figure 5 , the structure shown therein can be understood as the planar structure of the separator strip 2201 before being wound into the core body 200 (it can also be understood as the planar structure when the separator 220 is unfolded after the core body 200 is disassembled). Among them, it can be observed that one side edge of the separator strip 2201 corresponding to the second end b is stepped, and the two "steps" it has respectively correspond to the first region S1 and the second region S2. Through the above structural design, the present utility model can simplify the processing difficulty of the separator 220 and at the same time facilitate the alignment of the separator 220 during the winding process.

[0053] Refer to Figure 6 and Figure 7 , Figure 6 which representatively shows a partial axial sectional view of the core body 200 of the battery that can embody the principle of the present utility model; Figure 7 which representatively shows Figure 6 a planar schematic diagram of the separator 220 shown in

[0054] Different from the structural design in which the concave portion 202 is rectangular in the embodiment shown in Figure 4 , as Figure 6As shown, in an embodiment of the present utility model, the recess 202 can also be a tapered hole. For example, in the order from the outer ring to the inner ring, the distance L1 between one end of the separator 220 away from the electrode plate 210 and the electrode plate 210 in the first region S1 can decrease. Accordingly, in the order from far to near relative to the core hole 201 on the axial direction X, the aperture of the recess 202 decreases. Through the above structural design, the present utility model can prevent the electrolyte from impacting the core body 200.

[0055] With reference to Figure 7 , the structure shown can be understood as the planar structure of the separator strip 2201 before being wound into the core body 200 (which can also be understood as the planar structure when the separator 220 is unfolded after the core body 200 is disassembled). Among them, it can be observed that a part of one side edge of the separator strip 2201 corresponding to the second end b is obliquely linear, and the other part is horizontally linear. These two parts respectively correspond to the first region S1 and the second region S2. Through the above structural design, the present utility model can further prevent the electrolyte from impacting the core body 200.

[0056] As Figure 3 shown, in an embodiment of the present utility model, a reference plane perpendicular to the axial direction X is defined. On this reference plane, the ratio of the diameter d1 of the orthographic projection pattern of the first region S1 (equivalent to the diameter of the recess 202) to the diameter d2 of the orthographic projection pattern of the second region S2 (equivalent to the diameter of the core body 200) can be 0.05 - 0.5, such as 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, etc. In other words, the ratio of the area of the first region S1 or the recess 202 to the area of the end face of the core body 200 on the side of the second end b can be 0.0025 - 0.25. Through the above structural design, the present utility model can design the recess 202 to be of a suitable size, avoiding the recess 202 being too large and affecting the assembly of the core body 200 and the battery cell base, and at the same time avoiding the recess 202 being too small and affecting the liquid injection effect. In some embodiments, the ratio of the diameter d1 of the orthographic projection pattern of the first region S1 to the diameter d2 of the orthographic projection pattern of the second region S2 can also be less than 0.05, or greater than 0.5, such as 0.049, 0.51, etc., and is not limited to this embodiment.

[0057] As Figure 4 shown, in an embodiment of the present utility model, along the radial direction of the core body 200, the inner diameter d3 of the recess 202 and the aperture d4 of the core hole (which is also equivalent to Figure 3The ratio of the diameter d1 of the orthographic projection pattern of the first region S1 shown can be 0.05 to 0.5, such as 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, etc. Through the above structural design, the utility model can avoid the recess 202 being too large and affecting the assembly of the core body 200 and the battery cell base, and at the same time can avoid the recess 202 being too small and affecting the liquid injection effect. In some embodiments, the ratio of the inner diameter d3 of the recess 202 to the aperture diameter d4 of the core hole can be less than 0.05 or greater than 0.5, such as 0.049, 0.51, etc., and is not limited to this embodiment.

[0058] It should be noted that taking Figure 4 the recess 202 with a rectangular cross-section shown as an example, its inner diameter d3 can be understood as the inner diameter of the recess 202 at any position on the axial direction X. In some embodiments, when the recess 202 is of other shapes, such as Figure 6 the recess 202 shown as a tapered hole, then the inner diameter d3 of the recess 202 can be understood as its maximum inner diameter, such as the inner diameter of the end of the recess 202 far from the core hole 201.

[0059] For example Figure 4 As shown, in an embodiment of the utility model, the inner diameter d3 of the recess 202 can specifically be 1 mm to 20 mm, such as 1 mm, 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, etc.

[0060] In an embodiment of the utility model, the depth of the recess 202 can be 0.2 mm to 10 mm, such as 0.2 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, 10 mm, etc. Taking Figure 4 the embodiment shown as an example, the depth of the recess 202 can be understood as the distance L1 shown in the drawing. Through the above structural design, the utility model can avoid the depth of the recess 202 being too deep and easily damaging the active material layer on the pole piece 210 and easily causing problems of material dropping and short circuit, and at the same time can avoid the depth of the recess 202 being too shallow and difficult to achieve the effect of improving infiltration and exhaust. In some embodiments, the depth of the recess 202 can also be less than 0.2 mm or greater than 10 mm, such as 0.199 mm, 10.05 mm, etc., and is not limited to this embodiment.

[0061] For example Figure 4As shown, in an embodiment of the present utility model, the difference Δr between the radius of the recess 202 (e.g., half of the above-mentioned inner diameter d3) and the radius of the core hole 201 (e.g., half of the above-mentioned hole diameter d4) can be greater than or equal to the distance d2 between the end of the separator 220 away from the electrode tab 210 and the electrode tab 210 in the second region S2. Through the above structural design, the present utility model can further prevent the separator 220 in the second region S2 from blocking the core hole 201 when it is bent inward, further improving the liquid injection efficiency of the battery and further optimizing the liquid injection effect.

[0062] As Figure 4 shown, in an embodiment of the present utility model, along the axial direction X of the battery, the ratio of the length (i.e., the distance L2 shown in the drawing) by which the outermost separator 220 exceeds the electrode tab 210 at the second end b to the depth of the recess 202 (i.e., the distance L1 shown in the drawing) can be 0.05 to 25, such as 0.05, 0.1, 0.5, 1, 5, 10, 20, 25, etc. Through the above structural design, the present utility model can prevent the above ratio from being too large and affecting the exhaust performance and wetting performance of the core body 200, and at the same time can prevent the above ratio from being too small and resulting in a reduction in the internal insulation performance. In some embodiments, the ratio of the distance L2 to the distance L1 can also be less than 0.05, or can be greater than 25, such as 0.049, 25.1, etc., and is not limited to this embodiment.

[0063] In an embodiment of the present utility model, the ratio of the thickness of the separator 220 to the depth of the recess 202 (e.g., Figure 4 the distance L1 shown in the drawing) can be 0.0006 to 1, such as 0.0006, 0.001, 0.01, 0.1, 0.2, 0.5, 1, etc. Through the above structural design, the shallower the depth of the recess 202 when the thickness of the separator 220 is thicker, because the thicker the thickness of the separator 220, the better the supporting force and it is not easy to deform and block, avoiding poor wettability. The deeper the depth of the recess 202 when the thickness of the separator 220 is thinner. In some embodiments, the ratio of the thickness of the separator 220 to the depth of the recess 202 can also be less than 0.0006, or can be greater than 1, such as 0.00059, 1.0001, etc., and is not limited to this embodiment.

[0064] In an embodiment of the present utility model, the thickness of the separator 220 can be 6 μm to 20 μm, such as 6 μm, 8 μm, 10 μm, 15 μm, 20 μm, etc. Through the above structural design, the present utility model can avoid the thickness of the separator 220 being too thin, which affects its ability to isolate electron transmission and makes its support ability poor and prone to deformation. At the same time, it can avoid the thickness of the separator 220 being too thick, which affects the transmission of lithium ions and increases the weight and volume of the battery. In some embodiments, the thickness of the separator 220 can also be less than 6 μm or greater than 20 μm, such as 5.9 μm, 20.5 μm, etc., and is not limited to this embodiment.

[0065] As Figure 4 or Figure 6 shown, in some embodiments of the present utility model, the bottom wall of the recess 202 can be the separator 220. In other words, the core body 200 forms the bottom wall of the recess 202 with a part of the separator 220. That is, the separator 220 extends beyond the electrode tab 210 along the axial direction X at each part of the second end b, and the end face of the second end b, the side wall and the bottom wall of the recess 202 are formed by the difference in the length of the separator 220 extending beyond the electrode tab 210 in different regions.

[0066] Refer to Figure 8 , Figure 8 , a partial axonometric sectional view of the core body 200 of the battery that can embody the principle of the present utility model is representatively shown.

[0067] As Figure 8 shown, in an embodiment of the present utility model, the battery proposed by the present utility model can further include an insulating member 300. The insulating member 300 is located on one side of the second end b of the core body 200. A convex portion 310 is provided on the surface of the insulating member 300 facing the core body 200, and the convex portion 310 is received in the recess 202. Through the above structural design, the present utility model can improve the insulation effect of the battery by using the insulating member 300, and at the same time, realize the relative positioning of the core body 200 and the insulating member 300 by the accommodation cooperation between the convex portion 310 and the recess 202.

[0068] As Figure 8 shown, based on the structural design that the battery includes the insulating member 300 and the insulating member 300 is provided with a high convex portion 310 received in the recess 202, in an embodiment of the present utility model, the convex portion 310 can be provided with a through hole 311 penetrating along the axial direction X, and the position of the through hole 311 corresponds to the position of the core hole 201. Through the above structural design, the present utility model can realize the manufacturing process of first assembling the insulating member 300 and the core body 200 and then injecting liquid, which is beneficial to simplifying the process complexity and improving the liquid injection effect. In some embodiments, the convex portion 310 may not be provided with a through hole 311 corresponding to the core hole 201, and is not limited to this embodiment.

[0069] It should be noted here that the batteries shown in the drawings and described in this specification are only a few examples of the many types of batteries that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the batteries shown in the drawings or described in this specification.

[0070] In summary, the battery proposed by the present invention includes a cylindrical winding core body 200, which is wound by stacked electrode sheets 210 and separators 220 and forms a winding core hole 201. The positive electrode tab and the negative electrode tab are both led out from the same end of the winding core body 200. A recess 202 communicating with the winding core hole 201 is provided at the non-tab leading end of the winding core body 200. The size of the recess 202 in the radial direction of the winding core body 200 is larger than the radial size of the winding core hole 201. Through the above structural design, the present invention can utilize the recess 202 connected to the winding core hole 201 and having a larger radial size to prevent the separator 220 at the non-tab leading end from bending inwards and blocking the winding core hole 201, ensuring the infiltration of the electrolyte, being beneficial to improving the liquid injection efficiency of the battery, optimizing the liquid injection effect, and further ensuring the gas discharge at the non-tab leading end.

[0071] Based on the above detailed description of several exemplary embodiments of the battery proposed by the present invention, an exemplary embodiment of the battery device proposed by the present invention will be described below.

[0072] According to one aspect of the present invention, there is provided a battery device, which includes the battery proposed by the present invention.

[0073] It should be noted here that the battery devices shown in the drawings and described in this specification are only a few examples of the many types of battery devices that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the battery devices shown in the drawings or described in this specification.

[0074] In summary, the battery device proposed by the present invention, by adopting the battery proposed by the present invention, can ensure the infiltration of the electrolyte, improve the liquid injection efficiency of the battery, optimize the liquid injection effect, and further ensure the gas discharge at the non-tab leading end.

[0075] The exemplary embodiments of the battery and battery device proposed by the present invention have been described and / or illustrated in detail above. However, the embodiments of the present invention are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from the other components and / or steps described herein. Each component and / or each step of one embodiment can also be used in combination with the other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", and "the above" etc. are used to indicate the existence of one or more elements / components / etc. The terms "comprising", "including", and "having" are used to mean an open inclusion and refer to the existence of additional elements / components / etc. in addition to the listed elements / components / etc. Furthermore, the terms "first", "second", etc. in the claims and the specification are only used as labels and are not numerical limitations on their objects.

[0076] Although the battery and battery device proposed by the present invention have been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the implementation of the present invention within the spirit and scope of the claims.

Claims

1. A battery, characterized in that: The battery comprises a winding core body, the winding core body is cylindrical, the winding core body is formed by winding stacked pole pieces and a diaphragm and is formed with a winding core hole, along the axial direction of the battery, the pole piece has a first end and a second end opposite to each other, and the positive pole tab and the negative pole tab of the pole piece extend from the first end; The second end is provided with a recessed portion connected to the winding core hole, and the radial dimension of the recessed portion of the winding core body is larger than the radial dimension of the winding core hole.

2. The battery according to claim 1, characterized in that Along the radial direction, the ratio of the inner diameter of the recessed portion to the hole diameter of the winding core hole is 0.05 to 0.

5.

3. The battery according to claim 2, characterized in that The inner diameter of the recessed portion is 1 mm to 20 mm.

4. The battery according to claim 1, characterized in that Along the axial direction, the depth of the recessed portion is 0.2 mm to 10 mm.

5. The battery according to claim 1, characterized in that Along the axial direction, a ratio of a length of the diaphragm located at the outermost circle beyond the pole piece at the second end to a depth of the recessed portion is 0.05-25.

6. The battery according to claim 1, characterized in that The ratio of the thickness of the diaphragm to the depth of the recessed portion is 0.0006-1.

7. The battery according to claim 6, characterized in that The thickness of the separator is 6 μm to 20 μm.

8. The battery according to claim 1, characterized in that The bottom wall of the recessed portion is the diaphragm.

9. The battery according to claim 1, characterized in that The recessed portion is a tapered hole.

10. The battery according to claim 1, characterized in that It also includes an insulating member, which is located at one side of the second end of the winding core body. A protrusion is provided on a surface of the insulating member facing the winding core body, and the protrusion is accommodated in the recessed portion.

11. The battery according to claim 10, characterized in that The protruding portion is provided with a through hole penetrating along the axial direction, and the position of the through hole corresponds to the position of the winding core hole.

12. A battery device, characterized in that: A battery comprising the battery according to any one of claims 1 to 11.

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