Battery

Abstract

The utility model provides a battery which comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell, the electrode assembly is provided with a first central surface along the thickness direction and a second central surface along the width direction, and one side of the electrode assembly along the height direction is provided with an extending tab. The tabs comprise a first tab and a second tab which are opposite in polarity, and the first tab and the second tab are located on the two sides of the first center face respectively and located on the two sides of the second center face respectively. According to the battery provided by the utility model, the structure that the first tab and the second tab are respectively positioned on the two sides of the first central surface and are respectively positioned on the two sides of the second central surface is adopted; and the first tab and the second tab are respectively contacted with different positions of the top cover along the thickness direction and the width direction of the electrode assembly, so that the effect of uniform stress between the tabs and the top cover is achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery-related structural technology, and more specifically, to a battery. Background Technology

[0002] In existing technology, a battery includes an electrode assembly and a casing, wherein the casing includes a top cover and a housing. The tabs on the electrode assembly are directly connected to the terminals on the top cover or indirectly connected through a current collector. The electrode assembly typically has a positive tab and a negative tab at the same end, and these tabs are usually located on the same side along the thickness direction of the electrode assembly. This design causes uneven force exerted by the electrode assembly on the top cover, leading to casing deformation. For example, when a single electrode assembly is present in the battery, if the assembly shakes, the pulling force on the side of the top cover near the positive and negative tabs is greater. This can cause the side of the top cover near the positive and negative tabs to collapse or deform, or cause deformation at the connection between the top cover and the housing, thus affecting battery performance.

[0003] As can be seen from the above, the existing battery technology has the problem that uneven force exerted by the electrode components on the top cover can easily lead to deformation of the battery casing. Utility Model Content

[0004] The main objective of this invention is to provide a battery that solves the problem in existing batteries where uneven force exerted by the electrode components on the top cover can easily lead to deformation of the battery casing.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery is provided, the battery including a housing and an electrode assembly, the electrode assembly being disposed inside the housing, the electrode assembly having a first central surface along its thickness direction and a second central surface along its width direction, the electrode assembly having a protruding tab on one side along its height direction, the tab including a first tab and a second tab with opposite polarities, the first tab and the second tab being located on opposite sides of the first central surface and opposite sides of the second central surface, respectively.

[0006] Furthermore, the first electrode and the second electrode are arranged symmetrically about the central axis of the electrode assembly, and the central axis is the boundary line between the first central plane and the second central plane.

[0007] Furthermore, the battery also includes an insulating sheet disposed on the top surface of the electrode assembly. The insulating sheet has a through-hole for the tabs to pass through and a mesh structure for the electrolyte to pass through.

[0008] Furthermore, the number of electrode assemblies is one, and the insulating sheet has two notches spaced apart along the width direction of the electrode assembly as through portions, with the opening ends of the two notches facing the first electrode tab and the second electrode tab, respectively.

[0009] Further, the battery further includes a转接 component and a top cover. The转接 component is provided corresponding to the tab ears one by one. The转接 component includes a first current collector member and a second current collector member that are spaced apart along the height direction of the electrode assembly, and the first current collector member is disposed on a side of the second current collector member away from the electrode assembly. The tab ear has a bent portion bent relative to the electrode assembly, and the bent portion is clamped between the first current collector member and the second current collector member and is connected to the first current collector member and the second current collector member. The top cover is disposed at an opening of the housing, and the top cover is connected to a side of the first current collector member facing away from the second current collector member.

[0010] Further, the first current collector member includes a first arm segment, a bent arm segment, and a second arm segment that are connected to each other. The first arm segment is fixedly connected to the top cover, the second arm segment is connected to the bent portion, and at least a part of the first arm segment and at least a part of the second arm segment are stacked along the height direction of the electrode assembly.

[0011] Further, along the thickness direction of the first current collector member, groove structures are provided on both sides of the bent arm segment, and the groove structures extend along the width direction of the electrode assembly; and / or the thickness of the bent arm segment is H1, and the thicknesses of the first arm segment and the second arm segment are H2, where 0.8H2 ≤ H1 < H2.

[0012] Further, a转接 pole is provided on a side of the first current collector member facing away from the second current collector member. The top cover pole of the top cover has a window structure, and at least a part of the转接 pole extends into the interior of the window structure, and the转接 pole is welded to the inner wall surface of the window structure.

[0013] Further, the battery further includes an insulating film. The insulating film is disposed on a side of the second current collector member facing away from the first current collector member. The insulating film has a hollowed-out portion for exposing a welding area between the second current collector member and the tab ear; and / or the second current collector member is a plate-like structure, and a projection area of the second current collector member on the insulating film is located inside an area formed by the outer peripheral edge of the insulating film.

[0014] Further, a projection area of the first current collector member on the top surface of the electrode assembly is larger than a projection area of the second current collector member on the top surface of the electrode assembly.

[0015] Applying the technical solution of the present utility model, the battery includes a housing and an electrode assembly. The electrode assembly is disposed inside the housing. The electrode assembly has a first central plane along its thickness direction and a second central plane along its width direction. One side of the electrode assembly along its height direction has an extended tab ear. The tab ear includes a first tab ear and a second tab ear with opposite polarities. The first tab ear and the second tab ear are respectively located on both sides of the first central plane and are respectively located on both sides of the second central plane.

[0016] As can be seen from the above, the battery of this application adopts a structure in which the first tab and the second tab are located on opposite sides of the first central plane and opposite sides of the second central plane, respectively. During assembly of the tabs with the top cover of the casing, the first tab and the second tab of this application contact different positions of the top cover along both the thickness and width directions of the electrode assembly. In this application, the positions where the first tab contacts the top cover and the second tab contact the top cover are located on opposite sides of the second central plane, thereby achieving a uniform force distribution between the top cover and the tabs. This overcomes the problem of uneven force distribution on the top cover caused by the tabs being located on the same side in the prior art. The reasonable structural arrangement of the electrode assembly in this application optimizes the placement and structure of the first and second tabs, which helps to improve the uniformity of force distribution between the tabs and the top cover during assembly, ensuring that the battery casing is not easily deformed and improving the stability of battery use. Furthermore, the completely staggered placement of the first and second tabs can prevent short circuits caused by contact between the two tabs. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A three-dimensional structural schematic diagram of the battery of this utility model is shown;

[0019] Figure 2 An exploded view of the battery of this invention is shown;

[0020] Figure 3 A schematic diagram of the mating structure of the top cover, current collector assembly, and electrode assembly of this utility model is shown.

[0021] Figure 4 A three-dimensional structural schematic diagram of the electrode assembly of this utility model is shown, wherein the electrode tabs are not bent;

[0022] Figure 5 A schematic diagram of one of the mating structures of the second current collector and the insulating film of this utility model is shown;

[0023] Figure 6 A schematic diagram of another mating structure between the second current collector and the insulating film of this utility model is shown;

[0024] Figure 7 A three-dimensional structural schematic diagram of the insulating sheet of this utility model is shown;

[0025] Figure 8 This invention shows a three-dimensional structural diagram of the first current collector component before bending.

[0026] Figure 9 This diagram shows another three-dimensional structural schematic of the first current collector component of this invention before bending.

[0027] The above figures include the following reference numerals:

[0028] 10. Housing; 20. Electrode assembly; 30. Top cover; 310. Top cover post; 311. Window structure; 40. Electrode tab; 410. First electrode tab; 420. Second electrode tab; 50. First current collector; 510. First arm segment; 511. Adapter post; 520. Bending arm segment; 521. Groove structure; 530. Second arm segment; 531. Current collector welding position; 60. Second current collector; 610. Welding area; 70. Insulating sheet; 710. Notch; 720. Mesh structure; 80. Insulating film; 810. Hollowed-out part; 90. Insulating pad. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] To address the problem in existing batteries where uneven stress on the top cover can easily lead to deformation of the battery casing, this embodiment provides a battery.

[0033] like Figures 1 to 9 As shown, the battery includes a housing 10 and an electrode assembly 20. The electrode assembly 20 is disposed inside the housing 10. The electrode assembly 20 has a first central surface S1 along its thickness direction and a second central surface S2 along its width direction. The electrode assembly 20 has protruding tabs 40 on one side along its height direction. The tabs 40 include a first tab 410 and a second tab 420 with opposite polarities. The first tab 410 and the second tab 420 are respectively located on opposite sides of the first central surface S1 and opposite sides of the second central surface S2. The battery can be a prismatic battery, and the housing 10 can be an aluminum casing.

[0034] It is understandable that one of the first electrode tab 410 and the second electrode tab 420 is a positive electrode tab and the other is a negative electrode tab. The electrode assembly 20 is composed of a positive electrode plate, a negative electrode plate and a diaphragm. The positive electrode plate has a positive electrode tab and the negative electrode plate has a negative electrode tab.

[0035] The first center plane S1 and the second center plane S2 are arranged perpendicularly. The width direction of the electrode assembly 20 is... Figure 1 The thickness direction of the electrode assembly 20 is shown in the X direction. Figure 1 As shown in the Y direction, the height direction of the electrode assembly 20 is... Figure 1 The Z direction is shown.

[0036] Specifically, the battery of this application adopts a structure in which the first tab 410 and the second tab 420 are respectively located on both sides of the first center plane S1 and on both sides of the second center plane S2. When the tabs 40 are assembled with the top cover 30 of the housing 10, the first tab 410 and the second tab 420 of this application contact the top cover 30 at different positions along the thickness direction of the electrode assembly 20. In this application, the positions where the first tab 410 contacts the top cover 30 and the positions where the second tab 420 contacts the top cover 30 are located on both sides of the first center plane S1. The electrode assembly 20 of this application optimizes the placement and structure of the first electrode 410 and the second electrode 420, thereby achieving uniform force distribution between the top cover 30 and the tab 40. This overcomes the problem of uneven force distribution on the top cover caused by the same-side placement of the tabs in the prior art. The electrode assembly 20 of this application optimizes the placement and structure of the first electrode 410 and the second electrode 420, which helps to improve the uniformity of force distribution between the tab 40 and the top cover 30 during assembly, ensuring that the battery casing is not easily deformed and improving the stability of battery use. Furthermore, the first electrode 410 and the second electrode 420 are completely staggered, which can prevent the two tabs from contacting each other and causing a short circuit.

[0037] In this embodiment, the boundary line between the first center plane S1 and the second center plane S2 forms the central axis of the electrode assembly. The first electrode tab 410 and the second electrode tab 420 are centrally symmetrical about the central axis of the electrode assembly, that is, the distance between the first electrode tab 410 and the first center plane S1 is equal to the distance between the second electrode tab 420 and the first center plane S1, and the distance between the first electrode tab 410 and the second center plane S2 is equal to the distance between the second electrode tab 420 and the second center plane S2. It can be understood that the first electrode tab 410 of this application is rotated 180° about the central axis and then coincides with the second electrode tab 420, thereby making the force applied to the top cover 30 by the first electrode tab 410 and the second electrode tab 420 more uniform.

[0038] like Figure 2 , Figure 3 and Figure 7As shown, the battery also includes an insulating sheet 70, which is disposed on the top surface of the electrode assembly 20. The insulating sheet 70 has a through portion for the tab 40 to pass through and a mesh structure 720. The mesh structure 720 is disposed between two notches 710 along the width direction of the housing 10. The mesh structure 720 is used for the electrolyte to pass through.

[0039] The insulating sheet 70 is disposed on the top surface of the electrode assembly 20 to provide insulation.

[0040] In this embodiment, there is one electrode assembly 20. The insulating sheet 70 has two notches 710 spaced apart along the width direction of the electrode assembly 20 as through portions. The opening ends of the two notches 710 face the first tab 410 and the second tab 420, respectively. The two notches 710 are used to avoid the two tabs 40. The two notches 710 are centrally symmetrical about the central axis to achieve a one-to-one correspondence with the two tabs 40.

[0041] Specifically, the insulating sheet 70 avoids the electrode tab 40 by providing a notch 710. That is, the electrode tab 40 of this application includes a protruding portion extending along the height direction of the housing 10 and a bent portion located on the side of the protruding portion facing away from the electrode assembly 20. The notch 710 avoids the protruding portion. The insulating sheet 70 of this application is used to insulate the top surface of the electrode assembly 20 and avoids the electrode tab 40. Furthermore, the opening ends of the two notches 710 face the first electrode tab 410 and the second electrode tab 420 respectively, facilitating the assembly of the insulating sheet 70.

[0042] The insulating sheet 70 is made of chemically resistant and insulating PE, PP or other polymer materials.

[0043] like Figures 1 to 9 As shown, the battery also includes an adapter assembly and a top cover 30. The electrode assembly 20 is disposed inside the housing 10. The tabs 40 have bent portions that are bent relative to the electrode assembly 20. The bending directions of the first tab 410 and the second tab 420 of the same electrode assembly 20 can be set to be relative to each other. The adapter assembly includes a first current collector 50 and a second current collector 60 that are spaced apart along the height direction of the housing 10. The first current collector 50 is disposed on the side of the second current collector 60 away from the electrode assembly 20. The bent portions are sandwiched between the first current collector 50 and the second current collector 60 and are connected to the first current collector 50 and the second current collector 60. The top cover 30 is disposed on the top opening of the housing 10 and is connected to the side of the first current collector 50 away from the second current collector 60. It should be noted that the adapter and the tab 40 are designed to be compatible. Taking the first tab 410 as the positive tab and the second tab 420 as the negative tab as an example, the first tab 410 inside the battery is connected to the positive adapter, and the second tab 420 inside the battery is connected to the negative adapter. This is a standard setting and will not be described in detail here.

[0044] This application employs a first current collector 50 and a second current collector 60 spaced apart, positioned on both sides of the bent portion of the tab 40. The first current collector 50, the bent portion, and the second current collector 60 are connected to form a whole. The structural arrangement of the first current collector 50 and the second current collector 60 not only protects the tab 40, preventing the welding head from directly impacting the tab 40 during welding and causing it to break, but also improves the overall structural strength, ensuring stability and conductivity.

[0045] The top cover 30 and the first current collector 50, as well as the first current collector 50, the tab 40, and the second current collector 60, are all fixed by welding to improve the structural strength of the battery in this application. Preferably, the top cover 30 and the first current collector 50 are laser welded, and the first current collector 50, the tab 40, and the second current collector 60 are ultrasonic welded.

[0046] In this embodiment, the second current collector 60 is disposed above the insulating sheet 70 to be insulated from the electrode assembly 20.

[0047] like Figure 2 and Figure 3 As shown, the projected area of ​​the first current collector 50 on the top surface of the electrode assembly 20 is greater than the projected area of ​​the second current collector 60 on the top surface of the electrode assembly 20.

[0048] The first current collector 50 and the second current collector 60 have different structures. The area of ​​the first current collector 50 is larger than that of the second current collector 60. The larger area of ​​the first current collector 50 is conducive to stable welding and fixing with the top cover 30 and the electrode ear 40, so as to increase the contact area. The structure of the large-area first current collector 50 is conducive to improving the overall structural strength.

[0049] In this embodiment, the first current collector 50 includes a first arm segment 510, a bent arm segment 520 and a second arm segment 530 connected to each other. The first arm segment 510 is fixedly connected to the top cover 30, and the second arm segment 530 is connected to the bent portion. At least a portion of the first arm segment 510 and at least a portion of the second arm segment 530 are stacked along the height direction of the electrode assembly 20.

[0050] The first current collector 50, which is bent, can act as a buffer, thereby reducing the force exerted by the tab 40 on the top cover 30. In addition, at least a portion of the first arm segment 510 and at least a portion of the second arm segment 530 are stacked along the height direction of the electrode assembly 20, which can make more efficient use of the internal space of the housing 10.

[0051] In this embodiment, as Figure 8 and Figure 9 shown, the state of the first current collector member 50 before bending is presented. Before the bending operation, the first current collector member 50 is in a plate-like structure. Along the thickness direction of the first current collector member 50, groove structures 521 are provided on both sides of the bending arm segment 520. The groove structures 521 extend along the width direction of the electrode assembly 20. The provision of the groove structures 521 facilitates the bending operation, and when bending, the groove structures 521 can prevent the surface of the first current collector member 50 from cracking.

[0052] In this embodiment, the thickness of the bending arm segment 520 is H1, and the thicknesses of the first arm segment 510 and the second arm segment 530 are H2, where 0.8H2 ≤ H1 < H2. The bending arm segment 520 has a small thickness to facilitate bending, which is beneficial to improving the bending efficiency of the first current collector member 50. By defining the thickness of the bending arm segment 520 as H1, it is avoided that when the thickness of the bending arm segment 520 is too small, the bending arm segment 520 is prone to cracking, and when the thickness of the bending arm segment 520 is too large, it is inconvenient to perform the bending operation, affecting the bending efficiency.

[0053] In this embodiment, a transfer pole column 511 is provided on the first current collector member 50. The transfer pole column 511 is provided on the side of the first current collector member 50 facing away from the second current collector member 60. The top cover pole column 310 of the top cover 30 has a window structure 311. At least a part of the transfer pole column 511 extends into the interior of the window structure 311, and the transfer pole column 511 is welded to the inner wall surface of the window structure 311.

[0054] Specifically, the transfer pole column 511 is provided on the side of the first arm segment 510 facing the top cover 30. A current collector member welding position 531 for connecting with the tab is provided on the side of the second arm segment 530 close to the top cover 30. The current collector member welding position 531 forms a welding groove structure 521, and the inner surface of the groove structure 521 is frosted, which is beneficial to improving the ultrasonic welding bonding strength and thus improving the welding efficiency.

[0055] As Figure 3 、 Figure 5 and Figure 6 shown, the battery further includes an insulating film 80. The insulating film 80 is provided on the side of the second current collector member 60 facing away from the first current collector member 50. The insulating film 80 is provided on the second current collector member 60 to further insulate the second current collector member 60 and the electrode assembly 20.

[0056] Among them, the insulating film 80 is adhered to the second current collector member 60.

[0057] In this application, the insulating film 80 has a perforated portion 810, which exposes the welding area 610 between the second current collector 60 and the electrode tab 40. The welding area 610 can also be provided with a groove structure with a frosted inner surface, which is beneficial to improving the ultrasonic welding bonding strength and thus improving the welding efficiency. The perforated portion 810 is provided to facilitate welding operations in the perforated portion 810.

[0058] In this embodiment, the second current collector 60 has a plate-like structure, and the projection area of ​​the second current collector 60 on the insulating film 80 is located inside the area formed by the outer periphery of the insulating film 80. Using an insulating film 80 with a larger area than the second current collector 60 helps to ensure the insulation effect.

[0059] like Figure 2 As shown, the battery of this application also includes an insulating film 80 disposed inside the housing 10. The insulating film 80 is disposed between the outer peripheral surface of the electrode assembly 20 and the inner wall surface of the housing 10 to achieve insulation and heat insulation for protecting the electrode assembly 20.

[0060] In this embodiment, the insulating pad 90 is made of chemically resistant and insulating PE, PP or other polymer materials.

[0061] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0062] The battery of this application adopts a structure in which the first tab 410 and the second tab 420 are respectively located on both sides of the first central surface S1 and on both sides of the second central surface S2. When the tabs 40 are assembled with the top cover 30 of the housing 10, the first tab 410 and the second tab 420 of this application contact the top cover 30 at different positions along the thickness direction and the width direction of the electrode assembly 20, respectively. In this application, the positions where the first tab 410 contacts the top cover 30 and the positions where the second tab 420 contacts the top cover 30 are located on both sides of the first central surface S1. The electrode assembly 20 of this application optimizes the placement and structure of the first electrode 410 and the second electrode 420, thereby achieving uniform force distribution between the top cover 30 and the electrode tab 40. This overcomes the problem of uneven force distribution on the top cover caused by the electrode tabs being placed on the same side in the prior art. The electrode assembly 20 of this application optimizes the placement and structure of the first electrode tab 410 and the second electrode tab 420, which helps to improve the uniformity of force distribution between the electrode tab 40 and the top cover 30 during the assembly process of the electrode tab 40 and the top cover 30, ensuring that the battery casing is not easily deformed and improving the stability of battery use.

[0063] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery, characterized by, The battery comprises: a shell (10); an electrode assembly (20) arranged inside the shell (10), the electrode assembly (20) having a first central surface along a thickness direction thereof and a second central surface along a width direction thereof, and the electrode assembly (20) having an extended tab (40) on one side thereof along a height direction thereof, the tab (40) comprising first and second tabs (410, 420) of opposite polarity, the first and second tabs (410, 420) being respectively located on both sides of the first central surface and on both sides of the second central surface.

2. The battery of claim 1, wherein, The first and second tabs (410, 420) are arranged in central symmetry about a central axis of the electrode assembly, the central axis being an intersection line of the first and second central surfaces.

3. The battery of claim 1, wherein, The battery further comprises an insulating sheet (70) arranged on a top surface of the electrode assembly (20), the insulating sheet (70) having a through portion for the tab (40) to pass through and a mesh structure (720) for electrolyte to pass through.

4. The battery of claim 3, wherein, The number of the electrode assembly (20) is one, and the insulating sheet (70) is arranged with two gaps (710) as the through portion in the width direction of the electrode assembly (20), and the opening ends of the two gaps (710) are respectively directed toward the first and second tabs (410, 420).

5. The battery of claim 1, wherein, The battery further comprises: an adapter assembly comprising first and second current collecting members (50, 60) arranged in the height direction of the electrode assembly (20), and the first current collecting member (50) is arranged on a side of the second current collecting member (60) away from the electrode assembly (20); the tab (40) has a bent portion bent relative to the electrode assembly (20), the bent portion is clamped between the first and second current collecting members (50, 60) and connected with the first and second current collecting members (50, 60); a top cover (30) arranged at an opening of the shell (10), the top cover (30) being connected with a side of the first current collecting member (50) away from the second current collecting member (60).

6. The battery according to claim 5, wherein the first current collecting member (50) comprises a first arm segment (510), a bent arm segment (520) and a second arm segment (530) connected with each other, the first arm segment (510) is fixedly connected with the top cover (30), the second arm segment (530) is connected with the bent portion, and at least a part of the first arm segment (510) and at least a part of the second arm segment (530) are overlapped in the height direction of the electrode assembly (20).

7. The battery according to claim 6, wherein in the thickness direction of the first current collecting member (50), the bent arm segment (520) is provided with a groove structure (521) on both sides thereof, and the groove structure (521) extends in the width direction of the electrode assembly; and / or The thickness of the bending arm section (520) is H1, the thickness of the first arm section (510) and the second arm section (530) is H2, and 0.8H2≤H1<H2.

8. The battery of claim 5, wherein, The first current collecting member (50) is provided with a switching pole (511) on the side away from the second current collecting member (60), the top cover (30) is provided with a window structure (311) on the top cover pole (310), at least a part of the switching pole (511) extends into the inside of the window structure (311), and the switching pole (511) is welded with the inner wall of the window structure (311).

9. The battery of claim 5, wherein, The battery further comprises an insulating film (80), which is arranged on the side of the second current collecting member (60) away from the first current collecting member (50), The insulating film (80) is provided with a hollow part (810) for exposing the welding area (610) between the second current collecting member (60) and the tab (40); and / or The second current collecting member (60) is a plate structure, and the projection area of the second current collecting member (60) on the insulating film (80) is located inside the area formed by the outer periphery of the insulating film (80).

10. The battery of claim 5, wherein, The projection area of the first current collecting member (50) on the top surface of the electrode assembly (20) is greater than the projection area of the second current collecting member (60) on the top surface of the electrode assembly (20).

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