A battery

Abstract

The application relates to a battery, and relates to the field of batteries, comprising a battery cell, the battery cell comprising a pole piece, the pole piece comprising a body and a tab; wherein the material of the body is different from the material of the tab; one end of the body is connected with the end of the tab opposite in a first direction, the direction in which the tab is led out from the body is the first direction, and at least one connecting area is arranged at the connecting part of the body and the tab and fixedly connected; the connecting area comprises a first welding area and a second welding area, and the types of the first welding area and the second welding area are different. The body and the tab are welded through the multiple welding areas, and the effect of improving the connection stability of the body and the tab with different materials is achieved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a type of battery. Background Technology

[0002] Currently, lithium-ion batteries are widely used due to their advantages of being lightweight, fast-charging, having high energy density, and long cycle life.

[0003] The electrodes and tabs in lithium batteries are both foil structures, which are soft and result in poor connection stability when welding the electrodes and tabs. Summary of the Invention

[0004] This application provides a battery that maintains a stable connection between the body of different materials in the cell and the electrode tabs.

[0005] This application provides a battery, including a cell, an electrode, and a body and a tab. The body is made of a different material than the tab. One end of the body is connected to the end of the tab opposite to it in a first direction, where the first direction is the direction in which the tab extends from the body. The body and the tab are fixedly connected by at least one connection area at the connection point. The connection area includes a first welding area and a second welding area, which are of different types.

[0006] In the above technical solution, the body and the electrode are made of different materials, and the melting points of different materials are different. When welding the body and the electrode, the stress generated at the connection position is different. By using two types of first welding area and second welding area to weld the body and the electrode, the stress at the welding position of the body and the electrode can be reduced, the disintegration of the body and the electrode in the connection area can be reduced, and the stable connection of the body and the electrode made of different materials can be improved. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure in Example 1 where the two welding zones are arranged along the first direction;

[0008] Figure 2 This is a schematic diagram of the structure in Example 1 where the two welding zones are arranged along the second direction;

[0009] Figure 3 This is a schematic diagram of the structure of the two connecting parts in Embodiment 2;

[0010] Figure 4 This is a schematic diagram of the structure in Embodiment 2 where the first welding area and the second welding area partially overlap along the second direction.

[0011] Figure 5 This is a schematic diagram of the structure in Embodiment 2 where the projections of the first welding area and the second welding area completely overlap along the second direction;

[0012] Figure 6 This is a schematic diagram of the structure in Example 3 where a portion of the first type of welding zone overlaps with a portion of the second type of welding zone;

[0013] Figure 7 This is a schematic diagram of the structure in Example 3 where a portion of the first type of welding area completely overlaps with a portion of the second type of welding area;

[0014] Figure 8 This is a schematic diagram of the structure in Example 3, showing a one-to-one correspondence between multiple welding areas of type I welding area and multiple welding areas belonging to type II welding area;

[0015] Figure 9 This is a schematic diagram of the external welding area and the internal welding area in Example 4;

[0016] Figure 10 This is a schematic diagram of the structure in which two adjacent external welding areas along the first direction contact each other in Embodiment 4;

[0017] Figure 11 This is a schematic diagram of the structure in Embodiment 4, where a notch is provided at one end of the electrode tab facing away from the main body along the second direction;

[0018] Figure 12 This is a schematic diagram of the structure in Example 5 where different types of welding zones are alternately arranged along the first direction;

[0019] Figure 13 This is a schematic diagram of the structure in Embodiment 5 where the ends of two adjacent welding areas along the first direction overlap.

[0020] 1. Body; 2. Electrode; 3. Connection area; 4. Welding area; 41. First welding area; 42. Second welding area. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present application will become clearer and more apparent.

[0022] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0023] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0024] This application discloses a battery, the battery structure including battery electrodes, a separator, an electrolyte, and a casing. The battery electrodes include a positive electrode and a negative electrode. The positive electrode includes a tab and a positive electrode sheet; the negative electrode includes a tab and a negative electrode sheet. In this application, the positive and negative electrode sheets are referred to as "body," and the tab is a metallic conductor electrically connected to the body. The battery electrodes and the separator are immersed in the electrolyte located within the casing, with the separator positioned between the positive and negative electrode sheets, allowing only easy passage of ions.

[0025] Example 1

[0026] This application discloses a battery, including a cell, wherein the cell includes an electrode, the electrode includes a body 1 and a tab 2, and the material of the body 1 is different from the material of the tab 2.

[0027] The body 1 is connected to one end of the electrode 2 that is opposite to the electrode 2 along a first direction, the first direction being the direction in which the electrode 2 is led out from the body 1, and the body 1 and the electrode 2 are fixedly connected by at least one connection area 3 at the connection part.

[0028] The connection area 3 includes a first welding area 41 and a second welding area 42, and the first welding area 41 and the second welding area 42 are of different types.

[0029] The battery cell includes a positive electrode, a negative electrode, and a separator, with the separator located between the positive and negative electrode. In this embodiment, the battery cell is a wound battery cell. In another embodiment, the battery cell is a laminated battery cell.

[0030] During cell production, the tab 2 is fixedly connected to the body 1 to form an electrode sheet. One end of the electrode sheet and the separator is fixed on the winding core. The winding core rotates to wind the electrode sheet into shape. The wound electrode sheet is pre-pressed into a square battery electrode sheet.

[0031] A battery consists of a casing and battery cells. The casing includes a prismatic shell and a cover plate. During battery production, the formed battery cells are placed inside the prismatic shell, the adapter plates of the cover plate are welded to the tabs 2 of the battery terminals, the cover plate is welded to the prismatic shell, and then electrolyte is filled into the casing.

[0032] Reference Figure 1 The material of the body 1 is different from the material of the tab 2. For example, the material of the tab 2 is copper, and the material of the body 1 is lithium metal. Specifically, the body 1 is lithium foil, and the tab 2 is copper foil. Optionally, the body 1 is aluminum foil, and the tab 2 is copper foil.

[0033] It should be noted that the material of the body 1 is not limited to lithium metal. In another embodiment, the material of the body 1 is a lithium alloy.

[0034] The body 1 is a long strip of foil, and the tab 2 is a long strip of foil. The length of the tab 2 is along the length of the body 1, and one end of the body 1 overlaps with one end of the tab 2 in the width direction. The tab 2 and the body 1 are stacked vertically along one end of the tab 2 in the width direction, and the tab 2 and the body 1 are fixedly connected in the overlap area. In this embodiment, the tab 2 and the body 1 are fixedly welded together.

[0035] For ease of explanation, a first direction and a second direction are defined, where the first direction is the direction in which the tab 2 extends from the body 1, and the first direction is also the width direction of the tab 2; the second direction is the length direction of the tab 2. In the accompanying drawings, the first direction is represented by the Y direction, and the second direction is represented by the X direction.

[0036] In another embodiment, when the cell is a stacked cell, the first direction is also the width direction of the separator, and the second direction is the length direction of the separator.

[0037] Reference Figure 1 The main body 1 and the electrode 2 are fixedly connected by at least one connection area 3 at the connection part. The length of the connection area 3 is set along the second direction, and the width of the connection area 3 is set along the first direction.

[0038] For example, a connection area 3 is provided between the body 1 and the electrode 2 for fixation. Optionally, two connection areas 3 are provided between the body 1 and the electrode 2, and the two connection areas 3 are arranged sequentially along a first direction. The two connection areas 3 can be arranged in contact along a second direction or spaced apart along a second direction, depending on design requirements.

[0039] It should be noted that the unwelded parts of the stacked portion between the main body 1 and the tab 2 can be fixed with conductive adhesive.

[0040] Reference Figure 1 Specifically, the connection area 3 includes multiple welding areas 4, which in turn include multiple types of welding areas. The multiple welding areas 4 include two types of welding areas: one is a pressure welding area, and the other is a laser welding area.

[0041] Optionally, the multiple welding zones 4 include three types of welding: pressure welding zone, ultrasonic welding zone, and laser welding zone.

[0042] All the multiple welding zones 4 are strips with their length along the second direction and their width along the first direction. Multiple welding zones 4 are arranged sequentially along the second direction, and at least one welding zone 4 is arranged along the first direction. The multiple welding zones 4 can be spaced apart, in contact, or overlapping according to design requirements. Different welding zones 4 may have the same or different shapes. Alternatively, some welding zones 4 may have the same shape, while others may have different shapes.

[0043] Reference Figure 1The connection area 3 includes a first welding area 41 and a second welding area 42, and the first welding area 41 and the second welding area 42 are of different types.

[0044] In this embodiment, the first welding area 41 and the second welding area 42 belong to two of the multiple types of welding areas.

[0045] During welding, the body 1 and one end of the tab 2 are stacked and then welded on the surface of the tab 2, forming a connection structure between the tab 2 and the body 1.

[0046] During laser welding, the laser irradiates the tab 2, causing the tab 2 and the body 1 to melt instantly, thus welding the tab 2 and the body 1 together.

[0047] During pressure welding, for example, the welding head of the pressure weld applies pressure directly to the tab 2. Optionally, when the body 1 and the tab 2 are pressure welded, after placing the body 1 and the tab 2, a protective sheet is placed on the body 1, so that the tab 2, the body 1 and the protective sheet are arranged sequentially along the thickness direction, and the welding head of the pressure weld applies pressure to the protective sheet.

[0048] In another embodiment, the electrode further includes a third metal component. The body 1 and the tab 2 are sequentially arranged along a first direction, and the two ends of the third metal component along the first direction respectively cover the opposite ends of the body 1 and the tab 2 along the first direction. One end of the third metal component along the first direction is welded and fixed to the body 1, and the other end is welded and fixed to the tab 2. The third metal component is not shown in the accompanying drawings.

[0049] Reference Figure 1 as well as Figure 2 Multiple welding zones 4 are arranged along the second direction and / or the first direction; the arrangement methods include, but are not limited to, alternating, sequential, partially overlapping, spaced, and contacting.

[0050] Alternating indicates that there is at least one welding area of ​​another type between two welding areas of the same type along the second or first direction. Sequential indicates that welding areas of different types are arranged in a certain order along the second or first direction, such as pressure welding area, ultrasonic welding area, and laser welding area arranged sequentially along the second direction. Partial overlap indicates that two welding areas of different types along the second or first direction partially overlap, or that one type of welding area is entirely located within a portion of the other type of welding area along the second or first direction. Spacing indicates that there is a gap between two welding areas of different types along the second or first direction. Contact indicates that there is no gap between two welding areas of different types along the second or first direction.

[0051] The materials of the body 1 and the tab 2 are different, their melting points are different when welded, the compatibility of welding the body 1 and the tab 2 is poor, and the internal stress after welding the body 1 and the tab 2 is uneven. One of the body 1 and the tab 2 is easily damaged by welding, resulting in unstable connection or welding damage, and poor connection stability.

[0052] In this embodiment, the body 1 and the tab 2 are fixed by welding using the first welding area 41 and the second welding area 42. Different welding methods result in different stresses when welding the body 1 and the tab 2, which helps to reduce the stress on the body 1 and the tab 2 at the welding position, reduce the disintegration of the body 1 and the tab 2 in the connection area 3, improve the stability of the connection between the body 1 and the tab 2, and improve the performance of the battery cell.

[0053] The body 1 and the tab 2 are made of different materials and have different stress-strain properties. When the welded battery electrode is wound, the battery electrode deforms, which further increases the stress between the body 1 and the tab 2 in the connection area 3. The body 1 and the tab 2 may disintegrate in the connection area 3, causing some of the connection positions of the body 1 and the tab 2 to separate, reducing the conductivity of the battery. Moreover, it is not possible to identify whether there is disintegration in some areas of the connection area 3 of the body 1 and the tab 2 from the appearance later.

[0054] In this embodiment, the first welding area 41 and the second welding area 42 are used to weld and fix the body 1 and the electrode 2, which helps to reduce the stress generated by the bending deformation of the body 1 and the electrode 2 at the welding position, further reduces the disintegration of the body 1 and the electrode 2 when bending occurs in the connection area 3, improves the stability of the connection between the body 1 and the electrode 2, and improves the performance of the battery cell.

[0055] Reference Figure 3 The plurality of welding zones 4 include two welding zones arranged sequentially along a first direction, and each welding zone includes a plurality of welding zones 4 arranged along the first direction.

[0056] Specifically, each welding area is a strip-shaped area with its length arranged along the second direction. In another embodiment, the connection area 3 includes three welding areas, which are arranged sequentially along the first direction.

[0057] The number of welding zones 4 included in each welding zone, the type of welding zone 4, and the shape of welding zone 4 can all be determined according to design requirements.

[0058] For example, each welding zone includes two welding zones. Optionally, one welding zone includes two welding zones, and another welding zone includes one welding zone. Optionally, one welding zone includes three welding zones, and another welding zone includes two welding zones.

[0059] Specifically, each welding area includes a first welding area 41 and a second welding area 42, and the projections of the first welding area 41 on the two welding areas along the first direction coincide, and the projections of the second welding area 42 on the two welding areas along the first direction coincide. The projections of the first welding area 41 and the second welding area 42 along the first direction are in contact but do not coincide.

[0060] As an optional feature, the battery also includes a current collector, the material of which is the same as that of the tab 2. For example, the current collector is an adapter plate on the battery cover that is electrically connected to the terminal post. Optionally, the current collector is a terminal post on the battery cover.

[0061] For example, the electrode 2 is made of copper, and the current collector is made of copper.

[0062] The material of the current collector is the same as that of the tab 2, which can reduce the resistance of the current collector and the tab 2 at the connection position.

[0063] Example 2

[0064] A battery, differing from Example 1 in that, with reference to Figure 4 As an alternative, the projections of the first welding area 41 and the second welding area 42 along the first direction at least partially overlap.

[0065] Specifically, the projection portions of the first welding area 41 on one welding area and the second welding area 42 on another welding area along the first direction overlap.

[0066] When the battery electrode is wound and bent, part of the deformation line of the battery electrode will pass through the first welding area 41 and the second welding area 42 at the same time. The deformation line is shown as a dashed line in the attached figure.

[0067] The body 1 and the tab 2 are made of different materials, resulting in different deformation capabilities. During the battery electrode winding process, the body 1 and tab 2 deform to different degrees, leading to insufficient connection stability along the first direction. The stress difference is greatest, especially in the area along the deformation line. The deformation line includes, on the one hand, the bending deformation locations during the battery electrode winding process; on the other hand, it can also include the deformation locations at the four corners of the electrode bending deformation when the wound cell is flattened. The greater the deformation of the body 1 and tab 2 at the corresponding positions along the deformation line, the greater the stress difference between them.

[0068] In this embodiment, since the first welding area 41 and the second welding area 42 are two different welding areas, they can disperse the stress generated between the body 1 and the tab 2 located in the connection area 3. The stress generated by the different welding areas 4 can be released along the first direction, reducing the stress accumulation along the second direction, thereby maintaining a stable connection between the body 1 and the tab 2.

[0069] When only pressure welding is used to weld between the body 1 and the tab 2, the connection strength between the body 1 and the tab 2 is less than the pressure difference corresponding to the area on the deformation line, which causes the body 1 and the tab 2 to disintegrate. The two welding areas cooperate with each other along the first direction to improve the stability of the connection between the body 1 and the tab 2.

[0070] Reference Figure 4 As an alternative, at least a portion of the first welding area 41 and the second welding area 42 are sequentially arranged along the first direction.

[0071] Specifically, along the first direction, the adjacent first welding area 41 and second welding area 42 are staggered, and the projection of one end of the first welding area 41 along the second direction along the first direction is located within the second welding area 42.

[0072] When the battery electrode is wound and bent, some of the deformation lines of the battery electrode will pass through the first welding area 41 and the second welding area 42 at the same time. The deformation lines are indicated by dashed lines in the attached figure. Since the first welding area 41 and the second welding area 42 are two types of welding areas, they can disperse the stress generated between the body 1 and the tab 2 at the connection area 3, further reduce the stress accumulation along the second direction, and maintain a stable connection between the body 1 and the tab 2.

[0073] Reference Figure 5 As an optional solution, the first welding area 41 and the second welding area 42 are arranged in a one-to-one correspondence along the first direction. Specifically, the projections of the first welding area 41 and the second welding area 42 along the first direction coincide.

[0074] All the deformation lines of the battery electrode will pass through the first welding area 41 and the second welding area 42 at the same time, thereby further reducing the stress generated between the body 1 and the tab 2 at the connection area 3 and improving the stability of the connection between the body 1 and the tab 2.

[0075] Example 3

[0076] Reference Figure 6 One type of battery differs from Embodiment 2 in that at least a portion of the first welding region 41 overlaps with a portion of the second welding region 42.

[0077] Specifically, the first welding area 41 and the second welding area 42 are arranged sequentially along the second direction, and the ends of two adjacent first welding areas 41 and second welding areas 42 overlap. At this time, in the projection along the first direction, the projected portions of the first welding area 41 and the second welding area 42 overlap. The overlapping portion is represented in the attached drawings as the overlap of a dotted filling pattern and a diagonal filling pattern.

[0078] Reference Figure 7As an alternative, the first welding area 41 completely overlaps with a portion of the second welding area 42.

[0079] Specifically, the first welding area 41 completely covers a portion of the second welding area 42.

[0080] During production, after the welding process of the second welding zone 42 is performed on the overlapping part of the body 1 and the tab 2, the welding process of the first welding zone 41 is then performed.

[0081] The presence of the first welding zone 41 disrupts the concentrated stress generated during welding of the second welding zone 42, reduces the occurrence of cracking between the body 1 and the tab 2, and improves the stability of the connection between the body 1 and the tab 2.

[0082] Reference Figure 7 As an alternative, the ends of two adjacent welding areas 4 belonging to the second welding area 42 are in contact along the second direction.

[0083] Reference Figure 8 As an optional solution, multiple first welding areas 41 are configured to correspond one-to-one with multiple second welding areas 42.

[0084] Reference Figure 8 As an alternative, the first welding zone 41 is a high-energy welding zone 4; the second welding zone 42 is a pressure welding zone 4.

[0085] For example, the high-energy welding zone 4 includes a laser welding zone 4; alternatively, the high-energy welding zone 4 may include either an ultrasonic welding zone 4 or an electron beam welding zone 4.

[0086] Pressure welding zone 4 is the weld area formed by pressing and welding the body 1 and the electrode 2. Laser welding zone 4 is the weld area formed by using laser welding to weld the body 1 and the electrode 2.

[0087] Pressure welding causes less damage to the body 1 and the tab 2, but the connection between the body 1 and the tab 2 is not strong enough. High-energy welding provides a strong connection between the body 1 and the tab 2, but causes more damage to the body 1 and the tab 2.

[0088] The two welding methods provided in this embodiment can reduce the damage caused by welding to the body 1 and the electrode 2 and improve the connection strength between the body 1 and the electrode 2.

[0089] Example 4

[0090] Reference Figure 9A battery, differing from Embodiment 2 in that the first welding area 41 surrounds the second welding area 42. Specifically, the first welding area 41 is square-ring shaped, and the second welding area 42 is square shaped. Two adjacent first welding areas 41 along the second direction are spaced apart, and two adjacent second welding areas 42 along the first direction are spaced apart.

[0091] In this embodiment, the first welding area 41 is the area welded using laser welding, and the second welding area 42 is the area welded using pressure welding.

[0092] Reference Figure 10 As an alternative, two adjacent second welding areas 42 along the second direction are in contact, and two adjacent second welding areas 42 along the first direction are spaced apart.

[0093] It should be noted that "continuous tab 2" means that the contact between tab 2 and body 1 along their length is continuous; for example, the battery electrode is a full tab 2. Optionally, tab 2 has a notch at the end facing away from body 1 along the first direction, as shown in the reference. Figure 11 .

[0094] Example 5

[0095] Reference Figure 12 A battery electrode, which differs from Embodiment 1 in that the first welding area 41 and the second welding area 42 are alternately arranged along a second direction.

[0096] Specifically, a second welding area 42 is provided between any two adjacent first welding areas 41 along the second direction. Optionally, two second welding areas 42 are provided between any two adjacent first welding areas 41 along the second direction.

[0097] The first welding area 41 and the second welding area 42 are alternately arranged along the second direction. When the connection area 3 undergoes bending deformation, the stress generated by one welding area increases a certain distance along the second direction and is then transferred to the stress generated by the other welding area. This reduces the situation where the stress caused by the same welding area gradually increases along the second direction until the body 1 and the tab 2 break apart. This improves the stability of the connection between the body 1 and the tab 2 in the connection area 3.

[0098] Reference Figure 12 As an alternative, the first welding area 41 and the second welding area 42 are spaced apart along the second direction.

[0099] Specifically, there is a gap between two adjacent welding areas 4 along the second direction. For example, the body 1 and the electrode 2 are not connected at the gap between the two welding areas 4. Optionally, the body 1 and the electrode 2 are bonded and fixed at the gap between the two welding areas 4 using conductive adhesive.

[0100] The gap between two adjacent welding zones 4 along the second direction can disperse the stress generated by the body 1 and the tab 2 in the welding zone 4 into multiple segments, reduce the accumulation of stress along the second direction, and reduce the occurrence of the body 1 and the tab 2 cracking in the welding zone 4.

[0101] Reference Figure 13 As an alternative, the ends of two adjacent welding zones 4 along the second direction coincide.

[0102] Specifically, the end of the first welding area 41 along the second direction coincides with the end of the second welding area 42 along the second direction. The overlapping portion is represented by two different types of fill lines overlapping in the accompanying drawings. For example, both ends of the first welding area 41 along the second direction coincide with the opposite ends of the two second welding areas 42 along the second direction, respectively. Optionally, one end of one welding area 4 along the second direction coincides with one end of another welding area 4 along the second direction.

[0103] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this application. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0104] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0105] The present application has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present application based on these embodiments, all of which fall within the protection scope of the present application.

Claims

1. A battery, characterized in that, The battery includes a cell, the cell comprising an electrode, and the electrode comprising a body and a tab; wherein, The material of the body is different from the material of the electrode tab. The material of the body is lithium metal or lithium alloy, and the material of the electrode tab is copper. The body and the electrode overlap at one end opposite to each other along the first direction, the electrode and the body stack up and down at one end along the first direction, the electrode and the body are fixedly connected in the overlap area, the first direction is the direction in which the electrode is led out from the body, and the body and the electrode are fixedly connected in the connection part by at least one connection area. The connection area includes a first welding area and a second welding area, and the first welding area and the second welding area are of different types.

2. The battery according to claim 1, characterized in that, At least a portion of the first welding area coincides with the projection of the second welding area along the first direction.

3. The battery according to claim 2, characterized in that, At least a portion of the first welding zone overlaps with a portion of the second welding zone.

4. The battery according to claim 3, characterized in that, The first welding area completely overlaps with a portion of the second welding area.

5. The battery according to claim 4, characterized in that, The first welding zone is a high-energy welding zone; the second welding zone is a pressure welding zone.

6. The battery according to claim 2, characterized in that, The first welding zone surrounds the second welding zone.

7. The battery according to claim 2, characterized in that, At least a portion of the first welding zone and the second welding zone are arranged sequentially along the first direction.

8. The battery according to claim 7, characterized in that, The first welding area and the second welding area are arranged in a one-to-one correspondence along the first direction.

9. The battery according to claim 1, characterized in that, The first welding area and the second welding area are alternately arranged along a second direction, which is perpendicular to the first direction.

10. The battery according to claim 1, characterized in that, The first welding area and the second welding area are spaced apart along a second direction, which is perpendicular to the first direction.

11. The battery according to any one of claims 1 to 10, characterized in that, It also includes a current collector, the material of which is the same as that of the tab.

12. The battery according to any one of claims 1 to 10, characterized in that, The battery cell is a wound battery cell.

13. The battery according to any one of claims 1 to 10, characterized in that, The battery cell is a laminated battery cell.

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