Battery

Abstract

The utility model discloses a battery, which comprises a battery cell, an anode material layer, a cathode material layer, an insulating layer, an anode material terminal formed at one end of the anode material layer and the cathode material layer, a first spiral space gap arranged in the anode material terminal, and a first conductive material structure arranged in the first spiral space gap; a negative electrode material terminal is formed at the other end of the positive and negative electrode material layer, a second spiral space gap is formed in the negative electrode material terminal, and a second conductive material structure is arranged in the second spiral space gap. The first conductive material structure is arranged in the first spiral space gap of the positive electrode material terminal, and the second conductive material structure is arranged in the second spiral space gap of the negative electrode material terminal, so that a gap space formed by inward flattening can be avoided, and the welding stability of the tab and the battery cell is ensured; and the battery is not easy to cause adverse factors such as high internal resistance, overlarge self-discharge, open circuit or incapability of use in a vibration environment used in the later period, so that the service life of the battery is prolonged.

Description

Technical Field

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

[0002] With the development of society, the intensification of environmental pollution and the increasing depletion of traditional energy sources, people's awareness of environmental protection has become stronger. New energy batteries have become the first choice for green energy due to their many advantages such as high energy density, high voltage platform, low self-discharge, and environmental friendliness.

[0003] At present, new energy batteries are divided into two types: metal shell and soft package. Among them, the positive and negative electrode materials of the battery need to be welded to the electrode tabs to form a bottom electrical circuit.

[0004] For the existing battery, the two ends of the positive and negative electrode materials are first flattened inward and then welded to the electrode tabs. When the positive electrode material is wound to form a spiral shape, a laminated fold structure will appear during the inward flattening, and the laminated fold will generate an interstitial space, resulting in poor welding after welding to the electrode tab. In the vibration environment used in the later stage of the battery, it is easy to cause high internal resistance and excessive self-discharge; or open circuit, inability to use and other adverse factors, thus reducing the service life of the battery and causing premature scrapping. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery that can solve the problem of poor welding between the positive and negative electrode materials and the electrode tabs.

[0006] In one embodiment, a battery is provided, including:

[0007] A battery cell, including a positive and negative electrode material layer and an insulating layer. The positive and negative electrode material layer and the insulating layer are wound and formed along a winding axis. In the direction of the winding axis, one end of the positive and negative electrode material layer protrudes from the insulating layer to form a spiral-shaped positive electrode material terminal. A first spiral space gap is formed inside the positive electrode material terminal, and a first conductive material structure is arranged in the first spiral space gap to enable radial electrical connection inside and outside the spiral-shaped positive electrode material terminal; the other end of the positive and negative electrode material layer protrudes from the insulating layer to form a spiral-shaped negative electrode material terminal. A second spiral space gap is formed inside the negative electrode material terminal, and a second conductive material structure is arranged in the second spiral space gap to enable radial electrical connection inside and outside the spiral-shaped negative electrode material terminal;

[0008] Electrode tabs, including a positive electrode tab and a negative electrode tab. The positive electrode tab is welded to the positive electrode material terminal to form an electrical connection, and the negative electrode tab is welded to the negative electrode material terminal to form an electrical connection.

[0009] In one embodiment, the first conductive material structure fills the first spiral space gap, and the first conductive material structure fills the second spiral space gap.

[0010] In one embodiment, the first conductive material structure is flush with the end face of the positive electrode material terminal to form a positive electrode material surface, and the positive electrode tab is welded to the positive electrode material surface; the second conductive material structure is flush with the end face of the negative electrode material terminal to form a negative electrode material surface, and the negative electrode tab is welded to the negative electrode material surface.

[0011] In one embodiment, the positive electrode tab is in contact connection with the radially inner part of the positive electrode material surface, and the negative electrode tab is in contact connection with the radially inner part of the negative electrode material surface.

[0012] In one embodiment, the first conductive material structure and the second conductive material structure are conductive material strips, and the conductive material strips are fixed at both ends of the positive and negative electrode material layers in the winding axial direction. After winding, the conductive material strips are wound into a spiral structure and filled in the first spiral space gap and the second spiral space gap.

[0013] In one embodiment, the cross-section of the conductive material strip is square.

[0014] In one embodiment, the conductive material strip is welded and fixed to the positive and negative electrode material layers.

[0015] In one embodiment, the conductive material strip and the positive and negative electrode material layers have the same material structure.

[0016] In one embodiment, the battery cell is in a cylindrical structure or a rectangular parallelepiped structure.

[0017] In one embodiment, it further includes a housing. The battery cell and the tabs are arranged inside the housing. A part of the positive electrode tab extends out of the housing. An insulating structure is provided between the positive electrode tab and the housing. The negative electrode tab is located inside the housing and is electrically connected to the housing.

[0018] For the battery according to the above embodiments, due to the protruding positive electrode material terminal and negative electrode material terminal at both ends of the battery cell, a first conductive material structure is arranged in the first spiral space gap of the positive electrode material terminal, and a second conductive material structure is arranged in the second spiral space gap of the negative electrode material terminal. This enables the positive electrode material terminal and the negative electrode material terminal with gaps to form an internally and externally conductive structure without being pressed flat inward, and can be directly used to connect the tabs. It can avoid the gap space formed by pressing flat inward, ensuring the stability of the welding between the tabs and the battery cell. In the vibration environment during the later use of the battery, it is not easy to cause adverse factors such as high internal resistance, excessive self-discharge, open circuit, or inability to use, thereby improving the service life of the battery.

[0019] Furthermore, the first conductive material structure fills the first spiral space gap, and the first conductive material structure fills the second spiral space gap, which can completely eliminate the gap space inside the positive electrode material terminal and the negative electrode material terminal, ensure the complete electrical conductivity connection of the radial materials of the positive electrode material terminal and the negative electrode material terminal, and thus keep the positive electrode material terminal and the negative electrode material terminal in good connection with the tab.

[0020] Furthermore, the first conductive material structure is flush with the end face of the positive electrode material terminal to form a positive electrode material surface, and the positive tab is welded to the positive electrode material surface; the second conductive material structure is flush with the end face of the negative electrode material terminal to form a negative electrode material surface, and the negative tab is welded to the negative electrode material surface. That is, the connecting part of the tab can be welded to the flat positive and negative material surfaces in a parallel face-to-face manner, eliminating the gap space at the connection between the tab and the positive and negative material terminals, thereby improving the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the internal structure of the battery in an embodiment;

[0022] Figure 2 is an axial sectional view of the internal structure of the battery in an embodiment;

[0023] Figure 3 is Figure 2 an enlarged view of the partial A in

[0024] Figure 4 is Figure 2 an enlarged view of the partial B in

[0025] The reference numerals are as follows:

[0026] 1 - battery cell, 11 - positive and negative electrode material layer, 111 - positive electrode material terminal, 112 - negative electrode material terminal, 113 - first spiral space gap, 114 - first conductive material structure, 115 - second spiral space gap, 116 - second conductive material structure, 12 - insulating layer, 13 - outer insulating layer, 14 - inner insulating layer;

[0027] 2 - tab, 21 - positive tab, 221 - first connecting part, 22 - negative tab, 221 - second connecting part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present utility model will be further described in detail below in conjunction with the accompanying drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, which is to avoid submerging the core part of the present application in excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the field.

[0029] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated otherwise that a certain sequence must be followed.

[0030] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0031] Before welding the electrode tabs at both ends of the positive and negative electrodes of the traditional battery core, the thin sheet materials reserved at each end need to be folded radially inward and pressed tightly. This process will result in a very large flatness tolerance at the ends of the battery core, leading to virtual welding with the electrode tabs, and it is very easy to damage the positive and negative electrode materials during the extrusion process. Eventually, after welding with the electrode ears, it is very easy to have poor welding. The battery is prone to high internal resistance and excessive self-discharge in the vibration environment during later use; or open circuit and cannot be used, etc., which reduces the service life of the battery and causes premature scrapping.

[0032] In the present utility model, a battery is provided, and the positive and negative thin sheets at both ends of the battery core are reset. After winding the positive and negative thin sheets at both ends of the battery core, the structure remains unchanged, and no folding and pressing are performed radially inward. Instead, a conductive material is arranged in the gap space between the positive and negative thin sheets, so that the end faces at both ends of the battery core are formed without gaps and have a high degree of integrity, which can achieve stable welding between the electrode tabs and the positive and negative thin sheets at both ends of the battery core, avoid poor welding between the electrode tabs and both ends of the battery core, and thus improve the service life of the battery.

[0033] Please refer to Figures 1 to 4, the battery of this embodiment can be a cylindrical battery or a soft-pack battery. This embodiment takes the cylindrical battery as an example for illustration.

[0034] The cylindrical battery mainly includes a battery cell 1 and electrode tabs 2. The battery cell 1 includes a positive and negative electrode material layer 11 and an insulating layer 12. The positive and negative electrode material layer 11 is in a thin sheet structure; before winding, the positive and negative electrode material layer 11 is in a sheet structure, and the insulating layer 12 is attached to one side of the positive and negative electrode material layer 11 by bonding; after winding, the positive and negative electrode material layer 11 and the insulating layer 12 are simultaneously wound and formed along the winding axis. In the radial direction of the winding axis, the positive and negative electrode material layer 11 and the insulating layer 12 are alternately staggered in sequence. Both the inner and outer sides of the positive and negative electrode material layer 11 in the radial direction have the insulating layer 12, so that the radially wound positive and negative electrode material layers 11 are separated from each other by the insulating layer 12.

[0035] Moreover, the battery cell 1 can also include an outer insulating layer 13 and an inner insulating layer 14. After the positive and negative electrode material layer 11 and the insulating layer 12 are wound and formed, a hollow cylindrical structure is formed. The outer insulating layer 13 wraps around the outer circumferential surface of the cylindrical structure, and the inner insulating layer 14 wraps around the inner circumferential surface of the hollow position of the cylindrical structure. The outer insulating layer 13 and the inner insulating layer 14 can provide better insulation protection for the battery cell 1, and the outer insulating layer 13 and the inner insulating layer 14 can also encapsulate and wrap the cylindrical structure wound by the positive and negative electrode material layer 11 and the insulating layer 12.

[0036] Among them, in the direction of the winding axis, the width of the positive and negative electrode material layer 11 is greater than the width of the insulating layer 12. One end of the positive and negative electrode material layer 11 protrudes (exposes) from the insulating layer 12 to form a spiral positive electrode material terminal 111, and the other end of the positive and negative electrode material layer 11 protrudes (exposes) from the insulating layer 12 to form a spiral negative electrode material terminal 112. And both the positive electrode material terminal 111 and the negative electrode material terminal 112 are exposed from the outer insulating layer 13 and the inner insulating layer 14.

[0037] The positive electrode material terminal 111 is in a spiral structure and has a first spiral space gap 113. A first conductive material structure 114 is provided in the first spiral space gap 113. The first conductive material structure 114 fills the first spiral space gap 113, and the positive electrode material terminal 111 realizes electrical connection between the inner and outer layer material terminals through the first conductive material structure 114 in the radial direction of the winding axis. The first conductive material structure 114 and the positive electrode material terminal 111 are spiral structures with complementary structures, and the first conductive material structure 114 and the positive electrode material terminal 111 form a complete annular structure.

[0038] The positive electrode material terminal 111 and the negative electrode material terminal 112 have a symmetrical structure. The negative electrode material terminal 112 has a spiral structure. The negative electrode material terminal 112 has a second spiral space gap 115. A second conductive material structure 116 is provided in the second spiral space gap 115. The second conductive material structure 116 fills the second spiral space gap 115. The negative electrode material terminal 112 realizes the electrical connection between the inner and outer layer material terminals through the second conductive material structure 116 in the radial direction of the winding axis. The second conductive material structure 116 and the negative electrode material terminal 112 are spiral structures with complementary structures. The second conductive material structure 116 and the negative electrode material terminal 112 form a complete annular structure.

[0039] Among them, the first conductive material structure 114 fills the first spiral space gap 113 in the positive electrode material terminal 111, and the second conductive material structure 116 fills the second spiral space gap 115 in the negative electrode material terminal 112. The filling means filling in the radial direction of the winding axis, that is, there is no gap in the axial direction of the winding axis in the first spiral space gap 113 and the second spiral space gap 115. The radial two side surfaces of the first conductive material structure 114 are attached to the positive electrode material terminal 111, and the radial two side surfaces of the second conductive material structure 116 are attached to the negative electrode material terminal 112, so that the inner and outer layer structures of the positive electrode material terminal 111 and the negative electrode material terminal 112 can be completely conducted in the radial direction.

[0040] In this embodiment, the tab 2 includes a positive tab 21 and a negative tab 22. Both the positive tab 21 and the negative tab 22 are tab structures. The positive tab 21 and the negative tab 22 are S-shaped tab structures. The positive tab 21 has a first connecting portion 211. The first connecting portion 211 is parallel to one end face of the battery cell 1. The first connecting portion 211 can be electrically connected to the positive electrode material terminal 111 by welding. The negative tab 22 has a second connecting portion 221. The second connecting portion 221 is parallel to the other end face of the battery cell 1. The second connecting portion 221 can be electrically connected to the negative electrode material terminal 112 by welding.

[0041] Both the positive tab 21 and the negative tab 22 are connected to the positive electrode material terminal 111 and the negative electrode material terminal 112 respectively in a surface contact manner, which can improve the stability of the electrical connection between the positive tab 21 and the negative tab 22 and the battery cell 1, and can realize high-power charge and discharge.

[0042] In this embodiment, due to the protruding positive electrode material terminal 111 and negative electrode material terminal 112 at both ends of the battery cell 1, a first conductive material structure 114 is disposed in the first spiral space gap 113 of the positive electrode material terminal 111, and a second conductive material structure 116 is disposed in the second spiral space gap 115 of the negative electrode material terminal 112. This enables the positive electrode material terminal 111 and the negative electrode material terminal 112 to form an internally and externally conductive structure without being pressed flat inward, and can be directly used to connect the tab 2. It can avoid the gap space formed by pressing flat inward, ensuring the stability of the welding between the tab 2 and the battery cell 1. In the vibration environment during the later use of the battery, it is not easy to cause adverse factors such as high internal resistance, excessive self-discharge, open circuit, or inability to use, thus increasing the service life of the battery.

[0043] In one embodiment, the entire outer surface of the first conductive material structure 114 exposed along the axial direction of the winding axis is flush with the end face of the positive electrode material terminal 111, forming a positive electrode material surface, and the first connecting portion 211 of the positive tab 21 is in surface contact welding with the positive electrode material surface. The entire outer surface of the second conductive material structure 116 exposed along the axial direction of the winding axis is flush with the end face of the negative electrode material terminal 112, forming a negative electrode material surface, and the second connecting portion 221 of the negative tab 22 is in surface contact welding with the negative electrode material surface.

[0044] With such a setting, the first connecting portion 211 of the positive tab 21 can be in contact connection with both the positive electrode material terminal 111 and the first conductive material structure 114, and the second connecting portion 221 of the negative tab 22 can be in contact connection with both the negative electrode material terminal 112 and the second conductive material structure 116. This further increases the contact area between the positive tab 21 and the negative tab 22 and the battery cell 1, thereby improving the stability of the electrical connection between the positive tab 21 and the negative tab 22 and the battery cell 1, and enabling high-power charge and discharge.

[0045] In other embodiments, a part of the outer surface of the first conductive material structure 114 exposed along the axial direction of the winding axis is flush with the end face of the positive electrode material terminal 111. Among them, the part of the first conductive material structure 114 connected to the first connecting portion 211 of the positive tab 21 is flush with the end face of the positive electrode material terminal 111, and the part of the first conductive material structure 114 not in contact connection with the first connecting portion 211 of the positive tab 21 may not be flush with the end face of the positive electrode material terminal 111, for example, it is recessed inward. With such a setting, it can also ensure that the first connecting portion 211 of the positive tab 21 is in surface contact welding with the positive electrode material terminal 111 and the first conductive material structure 114, thereby also enabling stable conductive connection and high-power charge and discharge.

[0046] Similarly, the portion of the outer surface of the second conductive material structure 116 exposed along the axial direction of the winding axis is flush with the end face of the negative electrode material terminal 112, wherein the portion of the second conductive material structure 116 connected to the second connection portion 221 of the negative electrode tab 22 is flush with the end face of the negative electrode material terminal 112, and the portion of the second conductive material structure 116 not in contact connection with the second connection portion 221 of the negative electrode tab 22 may not be flush with the end face of the negative electrode material terminal 112, for example, recessed relatively inward. With such a setting, it can also ensure that the second connection portion 221 of the negative electrode tab 22 is in surface contact welding with the negative electrode material terminal 112 and the second conductive material structure 116, so that stable conductive connection can be achieved, and high-power charging and discharging can be realized.

[0047] In an embodiment, the first connection portion 211 of the positive electrode tab 21 has a certain area size, and the area of the first connection portion 211 is larger than the area of the hollow portion in the positive electrode material surface, so that the first connection portion 211 can be in contact connection with the radially inner portion of the positive electrode material surface, and it can be ensured that the first connection portion 211 is located in the middle of the battery and can be in contact with the positive electrode material.

[0048] Similarly, the second connection portion 221 of the negative electrode tab 22 has a certain area size, and the area of the second connection portion 221 is larger than the area of the hollow portion in the negative electrode material surface, so that the second connection portion 221 can be in contact connection with the radially inner portion of the negative electrode material surface, and it can be ensured that the second connection portion 221 is located in the middle of the battery and can be in contact with the negative electrode material surface.

[0049] Wherein, the first connection portion 211 and the second connection portion 221 may be set as circular structures or structures close to circular, so that the first connection portion 211 and the second connection portion 221 can be respectively connected to the middle position regions of the positive electrode material surface and the negative electrode material surface, and the uniformity and stability of the electrical connection can be improved.

[0050] In an embodiment, the first conductive material structure 114 and the second conductive material structure 116 may be conductive material strips, such as conductive metal strips. Before the winding of the battery cell 1, the first conductive material structure 114 and the second conductive material structure 116 can be fixed at the axial two ends of the positive and negative electrode material layers 11 by welding or other means, and the first conductive material structure 114 and the second conductive material structure 116 may be located on the same surface of the positive and negative electrode material layers 11. After winding and forming, the conductive material strips are wound into a spiral structure, and the conductive material strips have a preset thickness, so that the spiral conductive material strips just fill the first spiral space gap 113 and the second spiral space gap 115, and the conductive material strips are connected to the positive electrode material structure or the negative electrode material structure on the radial two sides.

[0051] The first conductive material structure 114 and the second conductive material structure 116 can be conductive material strips, so that the first conductive material structure 114 and the second conductive material structure 116 can be wound together with the positive and negative electrode material layer 11, which greatly facilitates the inlaid installation of the first conductive material structure 114 and the second conductive material structure 116 and improves the production efficiency of the battery cell 1.

[0052] In other embodiments, the first conductive material structure 114 and the second conductive material structure 116 can also be spiral structures. After the positive and negative electrode material layer 11 and the insulating layer 12 are wound into shape, the first conductive material structure 114 is respectively inlaid into the first spiral space gap 113 along the axis, and the second conductive material structure 116 is respectively inlaid into the second spiral space gap 115 along the axis.

[0053] The first conductive material structure 114 and the second conductive material structure 116 with spiral structures can also achieve inlaid installation.

[0054] In one embodiment, the cross-section (the section perpendicular to the length direction) of the conductive material strip is square, and the sides of the square conductive material strip are all flat. After the flat surface of the conductive material strip is curled, a spiral surface adapted to the radial two sides of the positive and negative electrode material layer 11 can be formed, and a surface flush with the axial end face of the positive and negative electrode material layer 11 can be formed.

[0055] The square conductive material strip enables the first conductive material structure 114 and the second conductive material structure 116 to be more closely attached to the positive and negative electrode material layer 11, which is beneficial to improving the stability of the inner and outer layer electrical connection of the positive electrode material terminal 111 and the negative electrode material terminal 112.

[0056] In other embodiments, the cross-section of the conductive material strip can also be such that three sides are flat and one side is curved. For example, the surface of the conductive material strip in contact with the positive and negative electrode material layer 11 is set to be flat, and the surface of the conductive material strip exposed on the outside is flat, and the surface of the conductive material strip hidden inside is an inwardly or outwardly convex curved surface. It can also be ensured that the first conductive material structure 114 and the second conductive material structure 116 can be more closely attached to the positive and negative electrode material layer 11, which is beneficial to improving the stability of the inner and outer layer electrical connection of the positive electrode material terminal 111 and the negative electrode material terminal 112.

[0057] In one embodiment, the conductive material strip and the positive and negative electrode material layer 11 have the same material structure, that is, the first conductive material structure 114 and the second conductive material structure 116 and the positive and negative electrode material layer 11 have the same material structure. Using the same material can reduce the impedance between the first conductive material structure 114 and the second conductive material structure 116 and the positive and negative electrode material layer 11 and ensure the current conduction between the tab 2 and the battery cell 1.

[0058] In other embodiments, the conductive material strip may include an outer layer structure and an inner layer structure. The outer layer structure has the same material structure as the positive and negative electrode material layer 11, which can also reduce the impedance between the first conductive material structure 114 and the second conductive material structure 116 and the positive and negative electrode material layer 11. The inner layer structure may be other conductive material structures.

[0059] In one embodiment, the battery further includes a housing having a receiving cavity. The battery cell 1 and the electrode tabs 2 are installed in the receiving cavity of the housing. The portion of the positive electrode tab 21 away from the battery cell 1 extends out of the housing, and the housing is provided with an insulating structure, such as an insulating ring or an insulating collar, etc., that is insulated and separated from the positive electrode tab 21. The portion of the positive electrode tab 21 exposed outside the housing forms the positive terminal of the battery. The negative electrode tab 22 may be located in the receiving cavity of the housing, and the negative electrode tab 22 is electrically connected to the housing. A negative terminal may be provided at one end of the housing away from the positive terminal.

[0060] In other embodiments, the end of the negative electrode tab 22 away from the battery cell 1 may also extend out of the housing, and the housing is provided with an insulating structure, such as an insulating ring or an insulating collar, etc., that is insulated and separated from the negative electrode tab 22. The portion of the negative electrode tab 22 exposed outside the housing may directly form the negative terminal.

[0061] The above uses specific examples to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. Those skilled in the art of the present invention can also make several simple deductions, deformations or substitutions based on the idea of the present invention.

Claims

1. A battery, characterized in that, Comprising: A battery cell, including a positive and negative electrode material layer and an insulating layer, the positive and negative electrode material layer and the insulating layer are wound and formed along a winding axis. In the direction of the winding axis, one end of the positive and negative electrode material layer protrudes from the insulating layer to form a spiral positive electrode material terminal. There is a first spiral space gap inside the positive electrode material terminal, and a first conductive material structure is provided in the first spiral space gap so that the spiral positive electrode material terminal is electrically connected radially inside and outside; the other end of the positive and negative electrode material layer protrudes from the insulating layer to form a spiral negative electrode material terminal. There is a second spiral space gap inside the negative electrode material terminal, and a second conductive material structure is provided in the second spiral space gap so that the spiral negative electrode material terminal is electrically connected radially inside and outside; Tab, including a positive tab and a negative tab, the positive tab is welded to the positive electrode material terminal to form an electrical connection, and the negative tab is welded to the negative electrode material terminal to form an electrical connection.

2. The battery according to claim 1, wherein, The first conductive material structure fills the first spiral space gap, and the first conductive material structure fills the second spiral space gap.

3. The battery according to claim 2, characterized in that, The first conductive material structure is flush with the end face of the positive electrode material terminal to form a positive electrode material surface, and the positive tab is welded to the positive electrode material surface; the second conductive material structure is flush with the end face of the negative electrode material terminal to form a negative electrode material surface, and the negative tab is welded to the negative electrode material surface.

4. The battery according to claim 3, wherein The positive tab is in contact connection with the radially inner part of the positive electrode material surface, and the negative tab is in contact connection with the radially inner part of the negative electrode material surface.

5. The battery according to claim 1, characterized in that, The first conductive material structure and the second conductive material structure are conductive material strips, and the conductive material strips are fixed at both ends of the positive and negative electrode material layer in the winding axis direction. After winding and forming, the conductive material strips are wound into a spiral structure and filled in the first spiral space gap and the second spiral space gap.

6. The battery according to claim 5, wherein The cross-section of the conductive material strip is square.

7. The battery according to claim 5, wherein, The conductive material strip is welded and fixed to the positive and negative electrode material layer.

8. The battery according to claim 5, characterized in that, The conductive material strip and the positive and negative electrode material layer have the same material structure.

9. The battery according to claim 1, characterized in that, The battery cell is in a cylindrical structure, or the battery cell is in a rectangular parallelepiped structure.

10. The battery according to any one of claims 1 to 9, characterized in that, It further includes a housing, the battery cell and the tab are arranged inside the housing, a part of the positive tab extends out of the housing, an insulating structure is provided between the positive tab and the housing, the negative tab is located inside the housing and is electrically connected to the housing.

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