Battery

Abstract

Disclosed is a battery, comprising: a battery cell. The battery cell comprises a positive and negative electrode material layer and an insulating layer. One end of the positive and negative electrode material layer forms a positive electrode material terminal. A first spiral space gap is provided in the positive electrode material terminal, and a first conductive material structure is provided in the first spiral space gap. The other end of the positive and negative electrode material layer forms a negative electrode material terminal. A second spiral space gap is provided in the negative electrode material terminal, and a second conductive material structure is provided in the second spiral space gap. Since the first conductive material structure is provided in the first spiral space gap of the positive electrode material terminal, and the second conductive material structure is provided in the second spiral space gap of the negative electrode material terminal, gap spaces formed by inward flattening can be avoided, the stability of welding between tabs and the battery cell is ensured, and adverse factors such as high internal resistance, excessive self-discharge, open circuits, or failure to operate are less likely to occur in vibrating environments during later-stage use of the battery, thereby extending the service life of the battery.

Description

A type of battery Technical Field

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

[0002] With social development, increasing environmental pollution, and the depletion of traditional energy sources, people are becoming more and more aware of environmental protection. New energy batteries, with their high energy density, high voltage platform, low self-discharge, and environmental friendliness, have become the preferred choice for green energy.

[0003] Currently, new energy batteries are divided into two types: metal-cased and soft-pack. The positive and negative electrode materials of the battery need to be welded to the tabs to form the bottom electrical circuit.

[0004] In existing batteries, the positive and negative electrode materials are first flattened inwards before being welded to the tabs. The positive electrode material is wound into a spiral shape. When flattened inwards, a layered and wrinkled structure appears, which creates gaps. This makes it easy for poor welding to occur after welding to the tabs. In the vibrating environment used later, the battery is prone to high internal resistance, excessive self-discharge, or even open circuits, making it unusable. This reduces the battery's lifespan and causes it to fail prematurely. Summary of the Invention

[0005] The purpose of this invention 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, comprising:

[0007] A battery cell includes positive and negative electrode material layers and an insulating layer. The positive and negative electrode material layers and the insulating layer are wound along a winding axis. In the direction of the winding axis, one end of the positive and negative electrode material layers protrudes from the insulating layer to form a helical positive electrode material terminal. The positive electrode material terminal has a first helical space gap, and a first conductive material structure is provided in the first helical space gap to enable radial electrical connection between the inner and outer sides of the helical positive electrode material terminal. The other end of the positive and negative electrode material layers protrudes from the insulating layer to form a helical negative electrode material terminal. The negative electrode material terminal has a second helical space gap, and a second conductive material structure is provided in the second helical space gap to enable radial electrical connection between the inner and outer sides of the helical negative electrode material terminal.

[0008] The electrode includes a positive electrode and a negative electrode. The positive electrode is welded to the positive electrode material terminal to form an electrical connection, and the negative electrode 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 helical space gap, and the first conductive material structure fills the second helical 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 with the radially inner portion of the positive electrode material surface, and the negative electrode tab is in contact with the radially inner portion 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. The conductive material strips are fixed at both ends of the positive and negative electrode material layers along the winding axis. After being wound, the conductive material strips are wound into a spiral structure and fill the first spiral space gap and the second spiral space gap.

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

[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 has a cylindrical structure or a square structure.

[0017] In one embodiment, the battery cell and the electrode tab are disposed within the housing, a portion of the positive electrode tab extends out of the housing, an insulating structure is provided between the positive electrode tab and the housing, and the negative electrode tab is located within the housing and electrically connected to the housing.

[0018] According to the battery of the above embodiment, since the positive electrode material terminals and negative electrode material terminals protrude at both ends of the cell, a first conductive material structure is provided in the first helical space gap of the positive electrode material terminal, and a second conductive material structure is provided in the second helical space gap of the negative electrode material terminal. This allows the positive electrode material terminals and negative electrode material terminals with gaps to form an internal and external conductive structure without needing to be pressed inwards. This can be directly used to connect the tabs, avoiding the gap space formed by pressing inwards, ensuring the stability of the welding between the tabs and the cell. In the vibration environment used later, the battery is less likely to cause adverse factors such as high internal resistance, excessive self-discharge, open circuit, or inability to be used, 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 in the positive electrode material terminal and the negative electrode material terminal, ensuring complete conductive connection of the radial materials of the positive electrode material terminal and the negative electrode material terminal, thereby maintaining good connection between the positive electrode material terminal and the negative electrode material terminal and the electrode tab.

[0020] Furthermore, the first conductive material structure is flush with the end face of the positive electrode terminal, forming the positive electrode surface, and the positive electrode tab is welded to the positive electrode surface; the second conductive material structure is flush with the end face of the negative electrode terminal, forming the negative electrode surface, and the negative electrode tab is welded to the negative electrode surface. That is, the connection part of the tab can achieve parallel, face-to-face welding connection with the completely flat positive and negative material surfaces, eliminating the gap space at the connection between the tab and the positive and negative material terminals, thereby improving the battery's lifespan. Attached Figure Description

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

[0022] Figure 2 is an axial cross-sectional view of the inside of the battery in one embodiment;

[0023] Figure 3 is an enlarged view of part A in Figure 2;

[0024] Figure 4 is an enlarged view of part B in Figure 2;

[0025] The accompanying diagrams are labeled as follows:

[0026] 1-Battery cell, 11-Positive and negative electrode material layers, 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-Electrode tab, 21-Positive electrode tab, 221-First connecting part, 22-Negative electrode tab, 221-Second connecting part. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0029] Furthermore, 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 be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0030] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0031] In traditional batteries, before welding the electrode plates, the thin sheet material at each end of the cell needs to be folded and pressed radially inward. This process results in very large tolerances for the flatness of the cell ends, leading to poor welds with the electrode plates and making the positive and negative electrode materials very easy to damage during the pressing process. Ultimately, this makes it very easy for poor welding to occur after welding to the tabs. In the vibrating environment of later use, the battery is prone to high internal resistance, excessive self-discharge, or even open circuits, rendering it unusable and reducing its lifespan, thus prematurely scrapping the battery.

[0032] This invention provides a battery in which the positive and negative electrode sheets at both ends of the battery cell are reconfigured. After the positive and negative electrode sheets at both ends of the battery cell are wound, their structure remains unchanged. Instead of radially inward folding and pressing, conductive material is placed in the gap between the positive and negative electrode sheets. This results in gap-free end faces at both ends of the battery cell, creating highly intact end faces. This allows for stable welding of the electrode sheets to the positive and negative electrode sheets at both ends of the battery cell, avoiding poor welding and thus improving the battery's lifespan.

[0033] Please refer to Figures 1 to 4. The battery in this embodiment can be a cylindrical battery or a pouch battery. This embodiment will be described using a cylindrical battery as an example.

[0034] The cylindrical battery mainly includes a cell 1 and tabs 2. The cell 1 includes positive and negative electrode material layers 11 and an insulating layer 12. The positive and negative electrode material layers 11 are thin sheet structures. Before winding, the positive and negative electrode material layers 11 are sheet structures, and the insulating layer 12 is attached to one side of the positive and negative electrode material layers 11 by adhesive. After winding, the positive and negative electrode material layers 11 and the insulating layer 12 are wound together along the winding axis. In the radial direction of the winding axis, the positive and negative electrode material layers 11 and the insulating layer 12 are alternately distributed. The inner and outer sides of the positive and negative electrode material layers 11 are both equipped with insulating layers 12, so that the radially wound positive and negative electrode material layers 11 are separated from each other by the insulating layers 12.

[0035] Furthermore, the battery cell 1 may also include an outer insulating layer 13 and an inner insulating layer 14. The positive and negative electrode material layers 11 and the insulating layer 12 are wound to form a hollow cylindrical structure. 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 portion 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 they can also encapsulate the cylindrical structure formed by the winding of the positive and negative electrode material layers 11 and the insulating layer 12.

[0036] In the winding direction, the width of the positive and negative electrode material layers 11 is greater than the width of the insulating layer 12. One end of the positive and negative electrode material layers 11 protrudes from (exposes) the insulating layer 12, forming a spiral positive electrode material terminal 111. The other end of the positive and negative electrode material layers 11 protrudes from (exposes) the insulating layer 12, forming a spiral negative electrode material terminal 112. Both the positive electrode material terminal 111 and the negative electrode material terminal 112 are exposed in the outer insulating layer 13 and the inner insulating layer 14.

[0037] The positive electrode material terminal 111 has a helical structure and a first helical space gap 113. A first conductive material structure 114 is disposed within the first helical space gap 113, filling the space. The positive electrode material terminal 111 achieves electrical connection between its inner and outer material terminals radially through the first conductive material structure 114. The first conductive material structure 114 and the positive electrode material terminal 111 form a complementary helical structure, constituting 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 and a second spiral space gap 115. A second conductive material structure 116 is disposed within the second spiral space gap 115. The second conductive material structure 116 fills the second spiral space gap 115, and the negative electrode material terminal 112 achieves electrical connection between the inner and outer layer material terminals in the radial direction of the winding shaft through the second conductive material structure 116. The second conductive material structure 116 and the negative electrode material terminal 112 are a complementary spiral structure, forming a complete ring structure.

[0039] Specifically, the first conductive material structure 114 fills the first helical space gap 113 within the positive electrode material terminal 111, and the second conductive material structure 116 fills the second helical space gap 115 within the negative electrode material terminal 112. This "filling" means that the space is completely filled in the radial direction of the winding shaft; that is, there is no gap between the first helical space gap 113 and the second helical space gap 115 in the axial direction of the winding shaft. The radial sides of the first conductive material structure 114 are attached to the positive electrode material terminal 111, and the radial sides of the second conductive material structure 116 are attached to the negative electrode material terminal 112, ensuring complete conductivity between the inner and outer layers of the positive electrode material terminal 111 and the negative electrode material terminal 112 in the radial direction.

[0040] In this embodiment, the electrode tab 2 includes a positive electrode tab 21 and a negative electrode tab 22. Both the positive electrode tab 21 and the negative electrode tab 22 are electrode sheet structures, and both are S-shaped electrode sheet structures. The positive electrode tab 21 has a first connecting portion 211, which 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 electrode tab 22 has a second connecting portion 221, which 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 electrode tab 21 and the negative electrode tab 22 are connected to the positive electrode material terminal 111 and the negative electrode material terminal 112 respectively by surface contact, which can improve the stability of the electrical connection between the positive electrode tab 21 and the negative electrode tab 22 and the battery cell 1, and can realize high-power charging and discharging.

[0042] In this embodiment, due to the protruding positive electrode material terminals 111 and negative electrode material terminals 112 at both ends of the battery cell 1, a first conductive material structure 114 is provided in the first spiral space gap 113 of the positive electrode material terminal 111, and a second conductive material structure 116 is provided in the second spiral space gap 115 of the negative electrode material terminal 112. This allows the positive electrode material terminals 111 and negative electrode material terminals 112 to form an internally and externally conductive structure without needing to be pressed inwards. This can be directly used to connect the tabs 2, avoiding the gap space formed by pressing inwards, ensuring the stability of the welding between the tabs 2 and the battery cell 1. In the vibration environment used later, the battery is less likely to suffer from adverse factors such as high internal resistance, excessive self-discharge, open circuit, or inability to be used, thereby improving the battery's service life.

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

[0044] This configuration allows the first connection portion 211 of the positive electrode tab 21 to simultaneously contact and connect with both the positive electrode material terminal 111 and the first conductive material structure 114, and the second connection portion 221 of the negative electrode tab 22 to simultaneously contact and connect with both the negative electrode material terminal 112 and the second conductive material structure 116. This further increases the contact area between the positive electrode tab 21 and the negative electrode tab 22 and the battery cell 1, thereby improving the stability of the electrical connection between the positive electrode tab 21 and the negative electrode tab 22 and the battery cell 1, and enabling high-power charging and discharging.

[0045] In other embodiments, the portion of the outer surface of the first conductive material structure 114 exposed along the axial direction of the winding shaft is flush with the end face of the positive electrode material terminal 111. The portion of the first conductive material structure 114 connected to the first connection portion 211 of the positive electrode tab 21 is flush with the end face of the positive electrode material terminal 111. The portion of the first conductive material structure 114 not connected to the first connection portion 211 of the positive electrode tab 21 may not be flush with the end face of the positive electrode material terminal 111, for example, it may be relatively recessed. This arrangement ensures that the first connection portion 211 of the positive electrode tab 21 can achieve surface contact welding with the positive electrode terminal 111 and the first conductive material structure 114, thereby achieving a stable conductive connection and enabling high-power charging and discharging.

[0046] Similarly, the portion of the outer surface of the second conductive material structure 116 exposed along the axial direction of the winding shaft is flush with the end face of the negative electrode material terminal 112. 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. The portion of the second conductive material structure 116 not connected to 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, it may be recessed. This arrangement ensures that the second connection portion 221 of the negative electrode tab 22 can achieve surface contact welding with the negative electrode material terminal 112 and the second conductive material structure 116, thereby achieving a stable conductive connection and enabling high-power charging and discharging.

[0047] In one embodiment, the first connecting portion 211 of the positive electrode tab 21 has a certain area, and the area of ​​the first connecting portion 211 is larger than the area of ​​the hollow portion of the positive electrode material surface, so that the first connecting portion 211 can contact and connect with the radially inner portion of the positive electrode material surface, ensuring that the first connecting portion 211 is located in the middle of the battery and can contact the positive electrode material.

[0048] Similarly, the second connecting portion 221 of the negative electrode tab 22 has a certain area. The area of ​​the second connecting portion 221 is larger than the area of ​​the hollow portion of the negative electrode material surface, so that the second connecting portion 221 can contact and connect with the radially inner portion of the negative electrode material surface, ensuring that the second connecting portion 221 is located in the middle of the battery and can contact the negative electrode material surface.

[0049] The first connecting part 211 and the second connecting part 221 can be configured as a circular structure or a near-circular structure, so that the first connecting part 211 and the second connecting part 221 can be connected to the middle position region of the positive electrode material surface and the negative electrode material surface respectively, which can improve the uniformity and stability of the electrical connection.

[0050] In one embodiment, the first conductive material structure 114 and the second conductive material structure 116 can be conductive material strips, such as conductive metal strips. Before winding the battery cell 1, the first conductive material structure 114 and the second conductive material structure 116 can be fixed to the axial ends of the positive and negative electrode material layers 11 on the winding shaft by welding or other means. The first conductive material structure 114 and the second conductive material structure 116 can be located on the same side of the positive and negative electrode material layers 11. After winding, the conductive material strip is wound into a spiral structure. The conductive material strip has a preset thickness, so that the spiral structure of the conductive material strip just fills the first spiral space gap 113 and the second spiral space gap 115, and the conductive material strip is connected to the positive electrode material structure or the negative electrode material structure on both radial sides.

[0051] The first conductive material structure 114 and the second conductive material structure 116 can be conductive material strips, which can be wound together with the positive and negative electrode material layers 11, greatly facilitating the embedded installation of the first conductive material structure 114 and the second conductive material structure 116 and improving 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 a spiral structure. After the positive and negative electrode material layers 11 and the insulating layer 12 are wound and formed, the first conductive material structure 114 is respectively embedded into the first spiral space gap 113 along the axial direction, and the second conductive material structure 116 is respectively embedded into the second spiral space gap 115 along the axial direction.

[0053] The first conductive material structure 114 and the second conductive material structure 116 of the spiral structure can also be installed in an embedded manner.

[0054] In one embodiment, the cross-section (cross-section in the vertical 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 rolled up, it can form a spiral surface that is adapted to the radial sides of the positive and negative electrode material layer 11, and form a surface that is flush with the axial end face of the positive and negative electrode material layer 11.

[0055] The square conductive material strips allow the first conductive material structure 114 and the second conductive material structure 116 to fit more tightly with the positive and negative electrode material layers 11, which helps to improve 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 three planar surfaces and one curved surface. For example, the surface of the conductive material strip that contacts the positive and negative electrode material layers 11 can be set as a planar surface, the surface of the conductive material strip exposed on the outside can be a planar surface, and the surface of the conductive material strip hidden on the inside can be a concave or convex curved surface. This also ensures that the first conductive material structure 114 and the second conductive material structure 116 can achieve a tighter fit with the positive and negative electrode material layers 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 layers 11 are made of the same material structure, that is, the first conductive material structure 114 and the second conductive material structure 116 are made of the same material structure as the positive and negative electrode material layers 11. 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 layers 11, ensuring the current conduction between the tab 2 and the 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 is made of the same material as the positive and negative electrode material layers 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 layers 11. The inner layer structure may be other conductive material structures.

[0059] In one embodiment, the battery further includes a casing with a receiving cavity. The battery cell 1 and the tab 2 are installed in the receiving cavity of the casing. The portion of the positive tab 21 away from the battery cell 1 extends outward from the outer side of the casing, and the casing is provided with an insulating structure, such as an insulating ring or insulating ring, that is insulated from and separated from the positive tab 21. The portion of the positive tab 21 exposed in the casing forms the positive terminal of the battery. The negative tab 22 may be located in the receiving cavity of the casing and is electrically connected to the casing. The end of the casing away from the positive terminal may have a negative terminal.

[0060] In other embodiments, the end of the negative electrode tab 22 away from the cell 1 may also extend beyond the outer side of the housing, and the housing may have an insulating structure, such as an insulating ring or insulating circle, that is insulatingly separated from the negative electrode tab 22. The portion of the negative electrode tab 22 exposed outside the housing can directly form the negative terminal.

[0061] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A battery, characterized in that, include: A battery cell includes positive and negative electrode material layers and an insulating layer. The positive and negative electrode material layers and the insulating layer are wound along a winding axis. In the direction of the winding axis, one end of the positive and negative electrode material layers protrudes from the insulating layer to form a helical positive electrode material terminal. The positive electrode material terminal has a first helical space gap, and a first conductive material structure is provided in the first helical space gap to enable radial electrical connection between the inner and outer sides of the helical positive electrode material terminal. The other end of the positive and negative electrode material layers protrudes from the insulating layer to form a helical negative electrode material terminal. The negative electrode material terminal has a second helical space gap, and a second conductive material structure is provided in the second helical space gap to enable radial electrical connection between the inner and outer sides of the helical negative electrode material terminal. The electrode includes a positive electrode and a negative electrode. The positive electrode is welded to the positive electrode material terminal to form an electrical connection, and the negative electrode is welded to the negative electrode material terminal to form an electrical connection.

2. The battery as described in claim 1, characterized in that, 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 as described in 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 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.

4. The battery as described in claim 3, characterized in that, The positive electrode tab is in contact with the radially inner portion of the positive electrode material surface, and the negative electrode tab is in contact with the radially inner portion of the negative electrode material surface.

5. The battery as described in claim 1, characterized in that, The first conductive material structure and the second conductive material structure are conductive material strips. The conductive material strips are fixed at both ends of the positive and negative electrode material layers along the winding axis. After being wound, the conductive material strips are wound into a spiral structure and fill the first spiral space gap and the second spiral space gap.

6. The battery as described in claim 5, characterized in that, The cross-section of the conductive material strip is square.

7. The battery as described in claim 5, characterized in that, The conductive material strip is welded and fixed to the positive and negative electrode material layers.

8. The battery as described in claim 5, characterized in that, The conductive material strip has the same material structure as the positive and negative electrode material layers.

9. The battery as described in claim 1, characterized in that, The battery cell has a cylindrical structure or a square structure.

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

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