battery

Abstract

The utility model discloses a battery, include: bare electric core and shell, the bare electric core is located in the shell, the shell is by first cover plate and second cover plate welding and becomes, first cover plate has integrative first main wall body and two first side parts from the first main wall body two opposite edges homeward extension, second cover plate has integrative second main wall body and two second side parts from the second main wall body two opposite edges homeward extension, first main wall body with second main wall body form the shell in its thickness direction's two wall body, two first side parts form the shell in its length direction opposite two wall body, two second side parts form the shell in its width direction opposite two wall body.

Description

Technical Field

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

[0002] The battery casing typically includes a housing with a receiving groove and a cover. In related technologies, the battery casing is generally formed by stamping a metal sheet. In order to ensure sufficient deformation space during stamping, a thicker metal sheet is required, which results in higher material costs. Furthermore, the stamping process itself has the problems of high processing costs and low processing efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a new technical solution for batteries, which can at least solve the technical problem of high production costs of existing batteries.

[0004] This utility model provides a battery, including: a bare battery cell and a casing, wherein the bare battery cell is disposed inside the casing, and the casing is welded together by a first cover plate and a second cover plate; the first cover plate has an integrally formed first main wall and two first side portions extending in the same direction from two opposite edges of the first main wall; the second cover plate has an integrally formed second main wall and two second side portions extending in the same direction from two opposite edges of the second main wall; the first main wall and the second main wall form two walls of the casing in its thickness direction, the two first side portions form two opposite walls of the casing in its length direction, and the two second side portions form two opposite walls of the casing in its width direction.

[0005] Optionally, the first cover plate is located between the two second sides, or the second cover plate is located between the two first sides.

[0006] Optionally, the outer shell is a flat strip-shaped shell; or, the outer shell is an arc-shaped shell, and the second side is formed as an arc-shaped wall on the convex side of the second main wall.

[0007] Optionally, the first main wall or the second main wall is provided with a clearance opening extending through its thickness direction. The bare battery cell is provided with a first lead-out portion and a second lead-out portion on one side of the length direction of the outer casing. The first lead-out portion is connected to the side of the outer casing away from the clearance opening. The battery further includes: an insulating separator disposed between the first lead-out portion and the second lead-out portion, wherein the first lead-out portion, the insulating separator, and the second lead-out portion are stacked along the thickness direction of the outer casing; a lead-out terminal connected to the side of the second lead-out portion away from the insulating separator, wherein the lead-out terminal includes a lead-out portion and an outer peripheral portion, and the position of the lead-out portion corresponds to the clearance opening; and an insulating seal disposed between the side of the outer peripheral portion away from the second lead-out portion and the inner wall surface of the outer casing.

[0008] Optionally, the first lead-out portion abuts against the housing, and the second lead-out portion abuts against the lead-out terminal.

[0009] Optionally, the first lead-out portion is welded to the outer casing, and the second lead-out portion is welded to the lead-out portion.

[0010] Optionally, the first lead-out portion is connected to the outer casing by laser penetration welding, and the second lead-out portion is connected to the lead-out portion by laser penetration welding.

[0011] Optionally, the insulating isolation element includes: an insulating layer, wherein the insulating layer has a first metal layer on the side near the first lead-out portion, and the first metal layer is welded to the first lead-out portion; and / or, wherein the insulating layer has a second metal layer on the side near the second lead-out portion, and the second metal layer is welded to the second lead-out portion.

[0012] Optionally, the insulating separator is a membrane between the first electrode and the second electrode of the bare battery cell, and a first electrode material layer is provided on the side of the first lead-out portion near the membrane, and a second electrode material layer is provided on the side of the second lead-out portion near the membrane.

[0013] Optionally, the width of the first lead is the same as the width of the first electrode of the bare cell, and the width of the second lead is the same as the width of the second electrode of the bare cell.

[0014] Optionally, the insulating seal is bonded to the first cover plate or the second cover plate, and the lead-out terminal is bonded to the insulating seal.

[0015] Optionally, the bare cell has a wound structure, and the bare cell includes a first electrode and a second electrode; wherein, the tail of the first electrode exposes a first current collector at least on the side away from the second electrode to form the first lead-out portion, and the tail of the second electrode exposes a second current collector at least on the side away from the first electrode to form the second lead-out portion.

[0016] According to the present invention, the battery casing is welded together from a first cover plate and a second cover plate. The cross-sections of the first cover plate and the second cover plate are approximately U-shaped, and the structure is simple. Both can be formed by bending process without additional stamping process, which can effectively reduce the production cost of the battery and significantly improve the production efficiency of the battery.

[0017] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0019] Figure 1 This is a perspective view of a battery according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of a battery according to an embodiment of the present invention; Figure 3 This is an exploded view of the structure of a battery according to an embodiment of the present invention.

[0020] Figure label: 100. Battery; 10. First cover plate; 11. First main wall; 12. First side; 20. Second cover plate; 21. Second main wall; 22. Second side; 30. Bare battery cell; 31. First lead-out portion; 32. Second lead-out portion; 40. Insulating separator; 50. Lead-out terminal; 51. Lead-out portion; 52. Outer periphery; 60. Insulating seal. Detailed Implementation

[0021] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0022] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0024] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0026] The battery 100 according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] like Figures 1 to 3 As shown, the battery 100 according to an embodiment of the present invention includes: a bare battery cell 30 and a casing.

[0028] Specifically, the bare battery cell 30 is disposed inside the housing, which is welded together by a first cover plate 10 and a second cover plate 20. The first cover plate 10 has an integrally formed first main wall 11 and two first side portions 12 extending in the same direction from two opposite edges of the first main wall 11. The second cover plate 20 has an integrally formed second main wall 21 and two second side portions 22 extending in the same direction from two opposite edges of the second main wall 21. The first main wall 11 and the second main wall 21 form two walls of the housing in its thickness direction, the two first side portions 12 form two opposite walls of the housing in its length direction, and the two second side portions 22 form two opposite walls of the housing in its width direction.

[0029] In other words, such as Figures 1 to 3As shown, the battery 100 according to an embodiment of the present invention mainly includes a casing and a bare battery cell 30 disposed within the casing. The bare battery cell 30 can be a stacked structure or a wound structure. The casing includes a first cover plate 10 and a second cover plate 20. The first cover plate 10 includes a first main wall 11, which includes a first edge and a second edge disposed opposite to each other. The first edge of the first main wall 11 extends toward the lower side of the first main wall 11 with an integrally formed first side portion 12, and the second edge of the first main wall 11 extends toward the lower side of the first main wall 11 with an integrally formed first side portion 12. The first main wall 11 and the two first side portions 12 form a first cover with a cross-section that is approximately U-shaped. The second cover plate 20 includes a second main wall 21, which includes a first edge and a second edge disposed opposite to each other. The first edge of the second main wall 21 extends toward the upper side of the second main wall 21 with an integrally formed second side portion 22, and the second edge of the second main wall 21 extends toward the lower side of the second main wall 21 with an integrally formed second side portion 22. The second main wall 21 and the two second side portions 22 form a second cover with a cross-section that is approximately U-shaped. During assembly, the first main wall 11 and the second main wall 21 are arranged opposite each other along the thickness direction of the outer shell, forming two walls opposite each other in the thickness direction of the outer shell; the two first side portions 12 are arranged opposite each other along the length direction of the outer shell, forming two walls opposite each other in the length direction of the outer shell; the two second side portions 22 are arranged opposite each other along the width direction of the outer shell, forming two walls opposite each other in the width direction of the outer shell. The outer shell of the battery 100 is formed by welding the edge of the first cover plate 10 to the corresponding edge of the second cover plate 20.

[0030] Therefore, according to the embodiment of the present utility model, the outer shell of the battery 100 is welded together by a first cover plate 10 and a second cover plate 20. The cross-sections of the first cover plate 10 and the second cover plate 20 are approximately U-shaped, with a simple structure. Both can be formed by bending process without additional stamping process, which can effectively reduce the production cost of the battery 100 and significantly improve the production efficiency of the battery 100.

[0031] In some specific embodiments of this utility model, the first cover plate 10 is located between the two second side portions 22, or the second cover plate 20 is located between the two first side portions 12.

[0032] Specifically, when the first cover plate 10 is located between the two second sides 22, the position of the first cover plate 10 can be restricted in the width direction of the housing by the two second sides 22, thereby effectively improving assembly efficiency; when the second cover plate 20 is located between the two first sides 12, the position of the second cover plate 20 can be restricted in the width direction of the housing by the two first sides 12, thereby effectively improving assembly efficiency.

[0033] According to one embodiment of the present invention, the outer shell is a flat strip-shaped shell; or, the outer shell is an arc-shaped shell, and the second side portion 22 is formed as an arc-shaped wall provided on the convex side of the second main wall 21.

[0034] In other words, when the outer casing is a flat, strip-shaped casing, the battery 100 is a strip-shaped battery 100; when the outer casing is an arc-shaped casing, the battery 100 is a curved battery 100. When the outer casing is an arc-shaped casing, the length of the outer casing is the inner arc length of the arc-shaped casing. In this case, both the first main wall 11 and the second main wall 21 are arc-shaped walls, and both the first main wall 11 and the second main wall 21 have a concave side and a convex side. In this embodiment, the first side portion 12 is formed as a flat wall located on the concave side of the first main wall 11; the second side portion 22 is formed as an arc-shaped wall located on the convex side of the second main wall 21. The second side portion 22 on the convex side will not wrinkle when the second main wall 21 is bent, which can ensure the production quality of the outer casing.

[0035] In some specific embodiments of this utility model, the first main wall 11 or the second main wall 21 is provided with a clearance opening extending through its thickness direction. The bare battery cell 30 is provided with a first lead-out portion 31 and a second lead-out portion 32 on one side of the length direction of the outer casing. The first lead-out portion 31 is connected to the side of the outer casing away from the clearance opening. The battery 100 further includes an insulating separator 40, which is disposed between the first lead-out portion 31 and the second lead-out portion 32. Part 31, the insulating isolation member 40 and the second lead-out part 32 are stacked along the thickness direction of the outer shell; lead-out terminal 50, the lead-out terminal 50 is connected to the side of the second lead-out part 32 away from the insulating isolation member 40, the lead-out terminal 50 includes a lead-out part 51 and an outer peripheral part 52, the lead-out part 51 corresponds to the position of the clearance opening; insulating seal 60, the insulating seal 60 is disposed between the side of the outer peripheral part 52 away from the second lead-out part 32 and the inner wall surface of the outer shell.

[0036] Specifically, such as Figure 2As shown, the outer casing has a clearance opening on one side of its thickness direction, which can be located on the first main wall 11 or the second main wall 21. The bare battery cell 30 can be a stacked structure or a wound structure. The bare battery cell 30 has a flat structure and is disposed inside the outer casing. The length direction of the bare battery cell 30 is the same as the length direction of the outer casing, and the thickness direction of the bare battery cell 30 is the same as the thickness direction of the outer casing. The bare battery cell 30 has a first lead-out portion 31 and a second lead-out portion 32 on one side of its length direction. The first lead-out portion 31 can be led out from the negative electrode of the bare battery cell 30, and the second lead-out portion 32 can be led out from the positive electrode of the bare battery cell 30. The lead-out portion can be a tab or a lead foil. An insulating separator 40 is provided between the first lead-out portion 31 and the second lead-out portion 32. The first lead-out portion 31, the insulating separator 40, and the second lead-out portion 32 are stacked along the thickness direction of the outer casing.

[0037] The first lead-out portion 31 is located on the side of the insulating isolator 40 away from the clearance opening, and the second lead-out portion 32 is located on the side of the insulating isolator 40 close to the clearance opening. The side of the second lead-out portion 32 close to the clearance opening is provided with a lead-out terminal 50 and an insulating seal 60 in sequence. The lead-out terminal 50 includes a lead-out portion 51 and an outer peripheral portion 52 surrounding the outer periphery of the lead-out portion 51. The position of the lead-out portion 51 corresponds to the position of the clearance opening of the housing, so that the lead-out portion 51 is exposed from the clearance opening. The insulating seal 60 is located between the side of the outer peripheral portion 52 away from the second lead-out portion 32 and the inner wall surface of the housing. Under the combined action of the first lead-out portion 31, the insulating isolator 40, the second lead-out portion 32, the lead-out terminal 50, and the insulating seal 60, the side of the first lead-out portion 31 away from the insulating isolator 40 abuts against the housing, and the side of the second lead-out portion 32 away from the clearance opening abuts against the lead-out terminal 50, thereby realizing the electrical connection between the first lead-out portion 31 and the housing, and the electrical connection between the second lead-out portion 32 and the lead-out terminal 50.

[0038] Therefore, according to the embodiment of the present invention, the battery 100, by stacking the first lead-out portion 31 and the second lead-out portion 32 along the thickness direction of the outer casing, can improve space utilization and increase the width of the first lead-out portion 31 and the second lead-out portion 32 within a limited space. This effectively increases the contact area between the first lead-out portion 31 and the outer casing and the contact area between the second lead-out portion 32 and the lead-out terminal 50, thereby effectively improving the charging and discharging efficiency of the battery 100. Moreover, under the combined action of the first lead-out portion 31, the insulating separator 40, the second lead-out portion 32, the lead-out terminal 50, and the insulating seal 60, the reliability of the electrical connection between the first lead-out portion 31 and the outer casing, as well as the reliability of the electrical connection between the second lead-out portion 32 and the lead-out terminal 50, can be guaranteed.

[0039] According to one embodiment of the present invention, the first lead-out portion 31 abuts against the outer casing, and the second lead-out portion 32 abuts against the lead-out terminal 50.

[0040] In this embodiment, the electrical connection between the first lead-out portion 31 and the outer casing, and the electrical connection between the second lead-out portion 32 and the lead-out terminal 50, can both be achieved by direct contact between the two without the need for additional welding processes, thereby effectively simplifying the manufacturing process of the battery 100.

[0041] In some specific embodiments of this utility model, the first lead-out portion 31 is welded to the outer casing, and the second lead-out portion 32 is welded to the lead-out portion 51. That is, in order to further improve the reliability and stability of the electrical connection, at least a portion of the first lead-out portion 31 can be welded to the outer casing, and at least a portion of the second lead-out portion 32 can be welded to the lead-out terminal 50.

[0042] According to one embodiment of the present invention, the first lead-out portion 31 is connected to the outer shell by laser penetration welding, and the second lead-out portion 32 is connected to the lead-out portion 51 by laser penetration welding.

[0043] Specifically, when welding the first lead-out portion 31 to the housing, laser welding equipment can be used to perform laser penetration welding on the side of the housing away from the lead-out terminal 50; when welding the second lead-out portion 32 to the lead-out portion 51, laser welding equipment can be used to perform laser penetration welding on the clearance opening of the housing. Using laser penetration welding allows the welding operation to be completed in a short time, significantly improving production efficiency, and effectively avoiding thermal damage to the bare cell 30 caused by welding.

[0044] In some specific embodiments of this utility model, the insulating isolation member 40 includes: an insulating layer, wherein a first metal layer is provided on the side of the insulating layer near the first lead-out portion 31, and the first metal layer is welded to the first lead-out portion 31; and / or, wherein a second metal layer is provided on the side of the insulating layer near the second lead-out portion 32, and the second metal layer is welded to the second lead-out portion 32.

[0045] In other words, the structure of the insulating spacer 40 includes, but is not limited to, the following four cases: Scenario 1: The insulating insulating component 40 is an independently installed insulating layer, such as a rubber layer; Case 2: The insulating insulating member 40 includes a first metal layer and an insulating layer, wherein the first metal layer is disposed on the surface of the insulating layer on the side near the first lead-out portion 31; Case 3: The insulating isolation element 40 includes a second metal layer and an insulating layer, wherein the second metal layer is disposed on the surface of the insulating layer on the side near the second lead-out portion 32; Case 4: The insulating insulating element 40 includes a first metal layer, a second metal layer and an insulating layer. The first metal layer is disposed on the surface of the insulating layer near the first lead-out portion 31, and the second metal layer is disposed on the surface of the insulating layer near the second lead-out portion 32.

[0046] When the laser welding power is high, the first metal layer is welded to the first lead-out portion 31, and the second metal layer is welded to the second lead-out portion 32. The first and second metal layers can protect the insulating layer, thereby effectively preventing damage to the insulating layer during welding and ensuring the reliability of the welding.

[0047] According to one embodiment of the present invention, the insulating separator 40 is a diaphragm between the first electrode and the second electrode of the bare cell 30, the first lead-out portion 31 is provided with a first electrode material layer on the side near the diaphragm, and the second lead-out portion 32 is provided with a second electrode material layer on the side near the diaphragm.

[0048] In other words, the bare cell 30 includes a first electrode, a second electrode, and a separator between the first and second electrodes. The separator extends between the first lead-out portion 31 and the second lead-out portion 32 to form an insulating separator 40. The side of the first lead-out portion 31 away from the separator is an empty foil surface to facilitate welding to the casing; the side of the second lead-out portion 32 away from the separator is also an empty foil surface to facilitate welding to the lead-out terminal 50. Furthermore, the side of the first lead-out portion 31 closest to the separator is provided with a first electrode material layer (e.g., a negative electrode active material layer), and the side of the second lead-out portion 32 closest to the separator is provided with a second electrode material layer (e.g., a positive electrode active material layer), thereby effectively improving the energy density of the battery 100.

[0049] According to some embodiments of the present invention, the insulating seal 60 is provided with an annular portion, the annular portion covering the inner wall surface of the clearance opening, the lead-out portion 51 is provided with a boss extending into the clearance opening, and the annular portion is located between the inner wall surface of the clearance opening and the outer peripheral surface of the boss.

[0050] Specifically, the insulating seal 60 has an annular portion covering the inner wall of the clearance opening, and the lead-out portion 51 has a boss on the side near the clearance opening. The boss extends into the clearance opening, and the end face of the boss is basically flush with the outer surface of the cover to facilitate connection with external circuits. The annular portion separates the inner wall of the clearance opening from the outer peripheral surface of the boss, and the annular portion can effectively prevent short circuits between the boss and the outer shell.

[0051] In some specific embodiments of this utility model, the width of the first lead-out portion 31 is the same as the width of the first electrode of the bare cell 30, and the width of the second lead-out portion 32 is the same as the width of the second electrode of the bare cell 30.

[0052] In detail, the bare cell 30 includes a first electrode and a second electrode. The first electrode can be a negative electrode and the second electrode can be a positive electrode. The width of the first lead 31 is the same as the width of the first electrode, and the width of the second lead 32 is the same as the width of the second electrode, thereby avoiding the cutting process and ensuring the contact area between the first lead 31 and the outer casing and the contact area between the second lead 32 and the lead terminal 50.

[0053] In some optional embodiments of this utility model, the width of the second lead-out portion 32 at the end near the second electrode is the same as that of the second electrode, and its width gradually decreases from the end near the second electrode to the end away from the second electrode to avoid the second lead-out portion 32 from contacting the housing, for example, its width gradually decreases to be the same as the radial dimension of the lead-out terminal 50.

[0054] According to one embodiment of the present invention, the insulating sealing element 60 is bonded to the first cover plate 10 or the second cover plate 20, and the lead-out terminal 50 is bonded to the insulating sealing element 60.

[0055] In other words, before the first cover plate 10 and the second cover plate 20 are connected, the insulating seal 60 can be first bonded to the first cover plate 10 or the second cover plate 20 with the clearance opening, and then the lead-out terminal 50 can be bonded to the insulating seal 60, so that the first cover plate 10 or the second cover plate 20, the insulating seal 60 and the lead-out terminal 50 are connected as one unit. This can effectively avoid misalignment during assembly, facilitate production and assembly, and at the same time, the sealing performance of the battery 100 can be effectively improved by bonding.

[0056] In some specific embodiments of this utility model, the bare battery cell 30 has a wound structure, and the bare battery cell 30 includes a first electrode and a second electrode; wherein, the tail of the first electrode exposes a first current collector at least on the side away from the second electrode to form the first lead-out portion 31, and the tail of the second electrode exposes a second current collector at least on the side away from the first electrode to form the second lead-out portion 32.

[0057] In this embodiment, the bare cell 30 is a wound bare cell formed by winding a first electrode (e.g., a negative electrode), a separator, and a second electrode (e.g., a positive electrode). The tail of the negative electrode exposes the negative current collector on both sides of its thickness direction to form a first lead-out portion 31, or the tail of the negative electrode exposes the negative current collector on the side away from the second electrode to form a first lead-out portion 31. Similarly, the tail of the positive electrode exposes the positive current collector on both sides of its thickness direction to form a second lead-out portion 32, or the tail of the positive electrode exposes the positive current collector on the side away from the second electrode to form a second lead-out portion 32. This wound bare cell has a simple structure and is easy to manufacture and assemble.

[0058] In summary, the battery 100 according to the present utility model embodiment has an outer shell that is welded together from a first cover plate 10 and a second cover plate 20. The cross-sections of the first cover plate 10 and the second cover plate 20 are approximately U-shaped, and the structure is simple. Both can be formed by bending process without additional stamping process, which can effectively reduce the production cost of the battery 100 and significantly improve the production efficiency of the battery 100.

[0059] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery, characterized in that, include: Bare battery cell (30) and housing, wherein the bare battery cell (30) is disposed inside the housing, and the housing is welded together by a first cover plate (10) and a second cover plate (20); The first cover plate (10) has an integrally formed first main wall (11) and two first side portions (12) extending in the same direction from the two opposite edges of the first main wall (11). The second cover plate (20) has an integrally formed second main wall (21) and two second side portions (22) extending in the same direction from two opposite edges of the second main wall (21); The first main wall (11) and the second main wall (21) are formed as two walls of the shell in its thickness direction, the two first side portions (12) are formed as two opposite walls of the shell in its length direction, and the two second side portions (22) are formed as two opposite walls of the shell in its width direction.

2. The battery according to claim 1, characterized in that, The first cover plate (10) is located between the two second sides (22), or the second cover plate (20) is located between the two first sides (12).

3. The battery according to claim 1, characterized in that, The outer shell is a flat, strip-shaped shell; Alternatively, the outer shell is an arc-shaped shell, and the second side (22) is formed as an arc-shaped wall on the convex side of the second main wall (21).

4. The battery according to claim 1, characterized in that, The first main wall (11) or the second main wall (21) is provided with a clearance opening extending through its thickness direction. The bare battery cell (30) is provided with a first lead-out portion (31) and a second lead-out portion (32) on one side of the length direction of the outer casing. The first lead-out portion (31) is connected to the side of the outer casing away from the clearance opening. The battery also includes: An insulating isolation member (40) is disposed between the first lead-out portion (31) and the second lead-out portion (32), and the first lead-out portion (31), the insulating isolation member (40) and the second lead-out portion (32) are stacked along the thickness direction of the outer shell; Lead-out terminal (50), the lead-out terminal (50) is connected to the side of the second lead-out portion (32) away from the insulating isolation member (40), the lead-out terminal (50) includes a lead-out portion (51) and an outer peripheral portion (52), the lead-out portion (51) is positioned opposite to the clearance opening; An insulating seal (60) is provided between the outer peripheral portion (52) on the side opposite to the second lead-out portion (32) and the inner wall surface of the outer casing.

5. The battery according to claim 4, characterized in that, The first lead-out portion (31) abuts against the outer casing, and the second lead-out portion (32) abuts against the lead-out terminal (50).

6. The battery according to claim 4, characterized in that, The first lead-out portion (31) is welded to the outer casing, and the second lead-out portion (32) is welded to the lead-out portion (51).

7. The battery according to claim 6, characterized in that, The first lead-out part (31) is connected to the outer shell by laser penetration welding, and the second lead-out part (32) is connected to the lead-out part (51) by laser penetration welding.

8. The battery according to claim 6, characterized in that, The insulating spacer (40) includes: An insulating layer is provided with a first metal layer on the side of the insulating layer near the first lead-out portion (31), and the first metal layer is welded to the first lead-out portion (31); and / or, a second metal layer is provided on the side of the insulating layer near the second lead-out portion (32), and the second metal layer is welded to the second lead-out portion (32).

9. The battery according to claim 4, characterized in that, The insulating separator (40) is a membrane between the first electrode and the second electrode of the bare cell (30). The first lead-out portion (31) is provided with a first electrode material layer on the side near the membrane, and the second lead-out portion (32) is provided with a second electrode material layer on the side near the membrane.

10. The battery according to claim 4, characterized in that, The width of the first lead-out portion (31) is the same as the width of the first electrode of the bare cell (30), and the width of the second lead-out portion (32) is the same as the width of the second electrode of the bare cell (30).

11. The battery according to claim 4, characterized in that, The insulating seal (60) is bonded to the first cover plate (10) or the second cover plate (20), and the lead-out terminal (50) is bonded to the insulating seal (60).

12. The battery according to any one of claims 4 to 11, characterized in that, The bare cell (30) has a wound structure, and the bare cell (30) includes a first electrode and a second electrode; Wherein, the tail of the first electrode exposes a first current collector at least on the side away from the second electrode to form the first lead-out portion (31), and the tail of the second electrode exposes a second current collector at least on the side away from the first electrode to form the second lead-out portion (32).

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