Busbar, end cap assembly and battery cell

Abstract

This application provides a busbar, end cap assembly, and battery cell, relating to the field of battery technology. The busbar includes a busbar plate with raised ribs and multiple tab welding portions. The multiple tab welding portions are spaced apart circumferentially along the busbar plate, and a raised rib is provided between at least two circumferentially adjacent tab welding portions. By providing raised ribs on the busbar plate, this application can, on the one hand, increase the strength of the busbar plate, making it less prone to deformation during welding to the tabs, thereby effectively avoiding incomplete welds and improving welding yield; on the other hand, the raised ribs can reduce the influence of the tab welding portions on both sides on each other during welding. Thus, the reliability of the welding between the busbar plate and the tabs can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a busbar, end cap assembly, and battery cell. Background Technology

[0002] The battery cell includes a housing, an electrode assembly disposed within the housing, and an end cap assembly that seals the housing. The end cap assembly includes a cover plate that snaps onto the housing, a terminal post disposed on the cover plate, and a busbar connecting the terminal post to a tab of the electrode assembly. The busbar includes a connected busbar disk and a conductive handle. The busbar disk is connected to the tab, and the conductive handle is bent to one side of the busbar disk and connected to the terminal post.

[0003] Because the busbar is relatively thin, its strength is low and it is prone to deformation. During the welding of the busbar to the tab, the busbar may deform due to welding stress and other factors, which can lead to incomplete welds between the busbar and the tab, resulting in a lower weld yield. Utility Model Content

[0004] Embodiments of this application provide a busbar, end cap assembly, and battery cell that can improve the welding reliability between the busbar and the electrode tab.

[0005] In a first aspect, embodiments of this application provide a busbar, which includes a busbar disk, on which ribs are provided and a plurality of electrode tab welding portions are provided. The plurality of electrode tab welding portions are arranged at intervals along the circumference of the busbar disk, and ribs are provided between at least two circumferentially adjacent electrode tab welding portions.

[0006] In one embodiment, the busbar has a first surface, on which a plurality of electrode tabs are provided, and ribs protrude outward from the first surface.

[0007] In one embodiment, the height of the rib protruding outward from the first surface is H1, and the thickness of the busbar is D, satisfying: 0.3D≤H1≤0.7D.

[0008] In one embodiment, the manifold is provided with a stamping groove, and the stamping groove and the rib are respectively located on both sides of the manifold, and the stamping groove and the rib are correspondingly provided.

[0009] In one embodiment, the radius of the busbar is R, and the radius of the end of the rib facing the center of the busbar is R1, satisfying: 0.25R≤R1≤0.45R.

[0010] In one embodiment, the radius of the end of the rib that is away from the center of the manifold is R2, which satisfies: 0.7R≤R2≤R.

[0011] In one embodiment, the rib is fan-shaped, and the central angle corresponding to the rib is α, which satisfies: 3°≤α≤10°.

[0012] In one embodiment, there are multiple ribs, and along the circumferential direction, the multiple ribs and multiple electrode lug welding parts are arranged alternately.

[0013] In one embodiment, the central angle corresponding to the gap between two adjacent circumferential ribs is β, which satisfies: 25°≤β≤40°.

[0014] In one embodiment, the busbar further includes a conductive handle, one end of which is connected to a portion of the outer edge of the busbar disk.

[0015] In one embodiment, the conductive handle includes a first connecting portion and a second connecting portion. The two ends of the first connecting portion are respectively connected to the busbar and the second connecting portion. The first connecting portion is configured to melt when the current passing through it reaches a preset value.

[0016] In one embodiment, the first connection portion has two sides in the current flow direction perpendicular to the first connection portion, and at least one side is provided with a notch.

[0017] In one embodiment, the first connecting portion is provided with a through hole.

[0018] Secondly, embodiments of this application provide an end cap assembly, which includes a cover plate, an electrode post, a lower plastic part, and the aforementioned manifold; the electrode post is disposed on the cover plate; the lower plastic part is disposed on one side of the cover plate; the manifold is located on the side of the lower plastic part away from the cover plate and is connected to the electrode post.

[0019] Thirdly, embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, a tab, and the aforementioned end cap assembly; the housing has a receiving cavity; the electrode assembly is disposed in the receiving cavity; one end of the tab is connected to the electrode assembly; a cover plate is closed to the housing, and the other end of the tab is connected to the tab welding portion.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] In the embodiments of this application, by providing raised ribs on the busbar, on the one hand, the strength of the busbar can be improved, making it less prone to deformation when welding the busbar to the electrode tab, thereby effectively avoiding incomplete welds between the busbar and the electrode tab and improving the welding yield; on the other hand, the raised ribs can reduce the influence of the electrode tab welding parts located on both sides on each other during welding. Thus, the reliability of the welding between the busbar and the electrode tab can be improved. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the bus provided in the embodiments of this application;

[0024] Figure 2 This is provided by the embodiments of this application. Figure 1 The side view of the shown busbar;

[0025] Figure 3 yes Figure 2 Sectional view of AA;

[0026] Figure 4 This is provided by the embodiments of this application. Figure 1 A schematic diagram of the structure of the busbar shown from another view;

[0027] Figure 5 This is a schematic diagram of the structure of another busbar provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of another busbar provided in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the structure of the end cap assembly provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the structure of the battery cell provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Bus module;

[0033] 11-Manifold; 111-Electrode welding part; 112-Rib; 113-First surface; 114-Stamping groove; 115-Injection hole;

[0034] 12-Conductive handle; 121-First connecting part; 1211-Notch; 1212-Through hole; 122-Second connecting part;

[0035] 2-End cap assembly; 21-Cover plate; 22-Electrical post; 23-Lower plastic part; 24-Terminal;

[0036] 3-Battery cell; 31-Casing. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product. In the description of embodiments of this application, words such as "example" or "for example" are used to indicate exemplification, illustration, or description.

[0041] Any embodiment or design described as "example" or "for example" in the embodiments of this application shall not be construed as being more preferred or having more advantages than another embodiment or design. The use of terms such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0042] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a busbar 1 provided in an embodiment of this application. The busbar 1 includes a busbar disk 11. The busbar disk 11 is provided with raised ribs 112 and a plurality of electrode tab welding portions 111. The plurality of electrode tab welding portions 111 are spaced apart circumferentially along the busbar disk 11. Raised ribs 112 are provided between at least two circumferentially adjacent electrode tab welding portions 111.

[0043] The rib 112 can be a structure formed by locally thickening the busbar 11, a protruding structure formed by locally stamping the busbar 11, or a reinforcing rib welded on the busbar 11.

[0044] In this embodiment, by providing ribs 112 on the busbar 11, the strength of the busbar 11 can be improved, making it less prone to deformation during welding to the electrode tabs, thereby effectively avoiding incomplete welds and improving the welding yield. Furthermore, the ribs 112 can absorb some welding stress, thus reducing the impact of the electrode tab welding portions 111 on both sides during welding. This improves the reliability of the welding between the busbar 11 and the electrode tabs.

[0045] Please see Figure 1 In one embodiment, the busbar 11 has a first surface 113. The first surface 113 is provided with a plurality of tab welding portions 111. A rib 112 protrudes outward from the first surface 113. This arrangement ensures that the rib 112 and the tab welding portions 111 are located on the same side of the busbar 11, allowing the height space of the rib 112 to coincide with the height space of the tabs, thereby reducing the height of the battery cell and increasing its energy density.

[0046] Please see Figure 2 and Figure 3 , Figure 2 yes Figure 1 The side view of the busbar 1 shown is shown. Figure 3 yes Figure 2 A cross-sectional view of AA. In one embodiment, the height of the rib 112 protruding outward from the first surface 113 is H1. The thickness of the manifold 11 is D. The following condition is satisfied: 0.3D ≤ H1 ≤ 0.7D.

[0047] It is understood that the height dimension H1 of the protruding rib 112 includes, but is not limited to, 0.3D, 0.33D, 0.36D, 0.38D, 0.4D, 0.43D, 0.45D, 0.48D, 0.5D, 0.53D, 0.56D, 0.58D, 0.6D, 0.63D, 0.66D, and 0.7D.

[0048] For example, the thickness D of the busbar 11 is 0.15 mm, and the height H1 of the rib 112 is 0.045 mm to 1.05 mm. Optionally, the height H1 of the rib 112 is 0.08 mm.

[0049] In this embodiment, by limiting the height dimension H1 of the rib 112, on the one hand, it can be avoided that the height dimension of the rib 112 is too small and the increase in strength of the busbar 11 is not obvious; on the other hand, it can be avoided that the height dimension of the rib 112 is too large, thereby reducing the molding difficulty and material cost.

[0050] Please see Figure 3 and Figure 4 , Figure 4 This is provided by the embodiments of this application. Figure 1The diagram shows another view of the manifold 1. In one embodiment, the manifold 11 is provided with a stamped groove 114. The stamped groove 114 and the rib 112 are respectively located on both sides of the manifold 11. The stamped groove 114 and the rib 112 are correspondingly provided.

[0051] It is understood that the busbar 11 is stamped to form a stamped groove 114 on one side of the busbar 11, and a rib 112 is formed on the other side based on the recess of the stamped groove 114. In this way, the busbar 11 is simple to form and easy to manufacture, thereby improving manufacturing efficiency.

[0052] Please see Figure 2 In one embodiment, the radius of the manifold 11 is R, and the radius of the end of the rib 112 facing the center of the manifold 11 is R1, satisfying: 0.25R≤R1≤0.45R.

[0053] It can be understood that the radius R1 of the end of the protruding rib 112 facing the center of the manifold 11 includes, but is not limited to, 0.25R, 0.28R, 0.3R, 0.32R, 0.34R, 0.35R, 0.37R, 0.38R, 0.39R, 0.4R, 0.42R, 0.44R, and 0.45R.

[0054] For example, the radius R of the manifold 11 is 8.8 mm, and the radius R1 of the end of the rib 112 facing the center of the manifold 11 is 2.2 mm to 3.96 mm. Optionally, R1 is 3.85 mm.

[0055] For example, the radius of the manifold 11 is 18mm, and the radius R1 of the end of the rib 112 facing the center of the manifold 11 is 8mm.

[0056] In this embodiment, by limiting the radius R1 of the end of the rib 112 facing the center of the manifold 11, on the one hand, the radius R1 can be avoided from being too small and affecting the setting of the injection hole 115 on the manifold 11, and on the other hand, the radius R1 can be avoided from being too large and the strengthening effect on the center of the manifold 11 is not obvious.

[0057] Please see Figure 2 In one embodiment, the radius of the end of the rib 112 that is away from the center of the manifold 11 is R2, which satisfies: 0.7R≤R2≤R.

[0058] It is understood that the radius R2 of the end of the protruding rib 112 that is away from the center of the manifold 11 includes, but is not limited to, 0.7R, 0.72R, 0.74R, 0.78R, 0.8R, 0.82R, 0.84R, 0.85R, 0.88R, 0.89R, 0.9R, 0.92R, 0.94R, 0.95R, 0.98R, 0.99R, and R.

[0059] For example, the radius R of the busbar 11 is 8.8 mm, and the radius R2 of the end of the rib 112 that is away from the center of the busbar 11 is 6.16 mm to 8.8 mm. Optionally, R2 is 7.15 mm.

[0060] For example, the radius of the manifold 11 is 18mm, and the radius R2 of the end of the rib 112 that is away from the center of the manifold 11 is 14mm.

[0061] In this embodiment, by limiting the radius R2 of the end of the rib 112 that is away from the center of the manifold 11, the length of the rib 112 can be prevented from being too small due to the radius R2 being too small, thereby ensuring the length of the rib 112, which is beneficial to improving the strength of the manifold 11.

[0062] Please see Figure 2 In one embodiment, the rib 112 is fan-shaped, and the central angle corresponding to the rib 112 is α, which satisfies: 3°≤α≤10°.

[0063] It is understood that the central angle α occupied by the convex rib 112 includes, but is not limited to, 3°, 3.6°, 4°, 4.2°, 4.8°, 5°, 5.3°, 6°, 6.5°, 7°, 8.2°, 8.8°, 9°, 9.3°, 9.5°, and 10°.

[0064] In this embodiment, by limiting the central angle α occupied by the rib 112, on the one hand, the size of the rib 112 in the circumferential direction of the busbar 11 can be guaranteed to improve the strength of the busbar 11. On the other hand, the size of the rib 112 in the circumferential direction of the busbar 11 can be avoided from being too large and affecting the welding between the busbar 11 and the electrode, thereby ensuring that the busbar 11 and the electrode have sufficient connection surface.

[0065] Please see Figure 1 or Figure 2 In one embodiment, there are multiple ribs 112. Along the circumferential direction, the multiple ribs 112 and multiple electrode lug weld portions 111 are arranged alternately. In this way, not only can the structural uniformity of the busbar 11 be improved, but also the strength of the busbar 11 can be improved, and the stress state of the busbar 11 can be improved.

[0066] Please see Figure 2 In one embodiment, the central angle corresponding to the gap between two adjacent circumferential ribs 112 is β, which satisfies: 25°≤β≤40°.

[0067] It is understood that the included angle β includes, but is not limited to, 25°, 26°, 27°, 28°, 30°, 32°, 33°, 34°, 35°, 37°, 38.2°, 39°, and 40°.

[0068] In this embodiment, by limiting the included angle β, multiple ribs 112 can be arranged to improve the strength of the busbar 11, and the electrode welding part 111 located between two adjacent ribs 112 can have sufficient area to ensure that the electrode connecting surface has sufficient connection surface to improve the reliability of its connection with the electrode.

[0069] Please see Figure 1 or Figure 2 In one embodiment, the busbar 1 further includes a conductive handle 12. One end of the conductive handle 12 is connected to a portion of the outer edge of the busbar disk 11.

[0070] Specifically, the conductive handle 12 and the busbar 11 are integrally formed.

[0071] The outer edge of the busbar 11 includes a curved line and a straight line segment. The two ends of the curved line are connected to the two ends of the straight line segment to form the outer edge of the busbar 11. One end of the conductive handle 12 is connected to the outer edge where the straight line segment is located.

[0072] In this embodiment, by providing the conductive handle 12, the ease of operation of connecting the busbar 1 with the tab and the terminal post 22 or the housing 31 of the battery cell can be improved, thereby improving the assembly efficiency.

[0073] Please see Figure 5 or Figure 6 , Figure 5 This is a schematic diagram of the structure of another busbar 1 provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of another busbar 1 provided in an embodiment of this application. In one embodiment, the conductive handle 12 includes a first connecting portion 121 and a second connecting portion 122. The two ends of the first connecting portion 121 are respectively connected to the busbar 11 and the second connecting portion 122. The first connecting portion 121 is configured to melt when the current passing through it reaches a preset value.

[0074] It is understandable that the current value when the first connection part 121 melts is less than the current value when the other parts of the busbar 1 melt.

[0075] One approach is to provide a slotted or perforated structure or thin the first connecting portion 121 to reduce its current-carrying area, thereby causing the first connecting portion 121 to melt when the current reaches a preset value. Alternatively, the first connecting portion 121 can be formed from a material with a higher resistance value compared to the rest of the busbar 1, so that the first connecting portion 121 melts when the current reaches a preset value.

[0076] For example, the busbar 1 is made of aluminum with a thickness of 0.15 mm. When the width W1 of the first connecting part 121 is 3 mm, it can pass a current of 80 A, with a preset value of 90 A. When the current is 90 A, the first connecting part 121 melts. When the width W1 of the first connecting part 121 is 4 mm, it can pass a current of 90 A, with a preset value of 100 A. When the current is 100 A, the first connecting part 121 melts.

[0077] It is understandable that the first connection part 121 can be adapted to different usage requirements so that the first connection part 121 melts after reaching the set current threshold in the corresponding usage environment.

[0078] In this embodiment, the above-mentioned settings can quickly cut off the current when a short circuit or overload occurs inside the battery cell, thereby preventing the battery cell from overheating, catching fire or exploding, and thus effectively ensuring safe use.

[0079] Please see Figure 5 In one embodiment, the first connecting portion 121 is configured to melt when the current passing through it reaches a preset value. This can be achieved by the following scheme: the first connecting portion 121 has two sides in the current flow direction perpendicular to the first connecting portion 121, and at least one side has a notch 1211. This makes the first connecting portion 121 simple to form and easy to manufacture.

[0080] Please see Figure 6 In another embodiment, the first connection portion 121 is configured to melt when the current passing through it reaches a preset value. This can also be achieved by providing a through hole 1212 in the first connection portion 121. This simplifies the forming of the first connection portion 121, making it easy to manufacture, and also facilitates the entry of electrolyte into the electrode assembly through the through hole 1212 during electrolyte injection.

[0081] Please see Figure 7 , Figure 7 This is a schematic diagram of the end cap assembly 2 provided in an embodiment of this application. Accordingly, an embodiment of this application also provides an end cap assembly 2. The end cap assembly 2 includes a cover plate 21, a pole post 22, a lower plastic part 23, and the aforementioned manifold 1. The pole post 22 is disposed on the cover plate 21. The lower plastic part 23 is disposed on one side of the cover plate 21. The manifold 1 is located on the side of the lower plastic part 23 away from the cover plate 21 and is connected to the pole post 22.

[0082] In this embodiment, by employing the busbar 1 provided in some embodiments of this application, on the one hand, the strength of the busbar 11 can be improved, making it less prone to deformation when welding the busbar 11 to the electrode tab, thereby effectively avoiding incomplete welding between it and the electrode tab, and improving the welding yield of the end cap assembly 2; on the other hand, the rib 112 can reduce the influence of the electrode tab welding portions 111 located on both sides on each other during welding. Thus, the reliability of the welding between the end cap assembly 2 and the electrode tab can be improved.

[0083] The end of the conductive handle 12 away from the busbar 11 is connected to the pole post 22.

[0084] Additionally, the end cap assembly 2 may also include a terminal 24, which is sleeved on the end of the electrode post 22 away from the lower plastic part 23 and soldered to the electrode post 22. The terminal 24 prevents the electrode post 22 from falling into the cell.

[0085] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a battery cell 3 provided in an embodiment of this application. An embodiment of this application also provides a battery cell 3. The battery cell 3 includes a housing 31, an electrode assembly, tabs, and the aforementioned end cap assembly 2. The housing 31 has a receiving cavity. The electrode assembly is disposed within the receiving cavity. One end of the tab is connected to the electrode assembly. A cover plate 21 covers the housing 31. The other end of the tab is connected to the tab welding portion 111.

[0086] It is understood that the electrode assembly includes a positive electrode plate, a separator, and a negative electrode plate stacked sequentially. The electrode tabs include a positive electrode tab and a negative electrode tab. The positive electrode tab connects the positive electrode plate to the positive electrode post 22, and the negative electrode tab connects the negative electrode plate to the negative electrode post 22 or the housing 31.

[0087] In this embodiment, by employing the end cap assembly 2 provided in some embodiments of this application, on the one hand, the strength of the busbar 11 can be improved, making it less prone to deformation when the busbar 11 is welded to the electrode tab, thereby effectively avoiding the existence of a false weld between it and the electrode tab; on the other hand, the protruding rib 112 can reduce the influence of the electrode tab welding portions 111 located on both sides on each other during welding. In this way, the reliability of the battery cell 3 can be improved.

[0088] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A busbar, characterized in that, The device includes a busbar, on which ribs are provided and multiple electrode tab welding parts are provided. The multiple electrode tab welding parts are arranged at intervals along the circumference of the busbar, and the ribs are provided between at least two electrode tab welding parts that are adjacent along the circumference.

2. The busbar according to claim 1, characterized in that, The manifold has a first surface, on which the plurality of electrode tabs are provided, and the ribs protrude outward from the first surface.

3. The busbar according to claim 2, characterized in that, The height of the rib protruding outward from the first surface is H1, and the thickness of the manifold is D, satisfying: 0.3D≤H1≤0.7D.

4. The busbar according to claim 1, characterized in that, The manifold is provided with a stamping groove, and the stamping groove and the rib are respectively located on both sides of the manifold, and the stamping groove and the rib are correspondingly arranged.

5. The busbar according to any one of claims 1-4, characterized in that, The radius of the manifold is R, and the radius of the end of the rib facing the center of the manifold is R1, satisfying: 0.25R≤R1≤0.45R.

6. The busbar according to claim 5, characterized in that, The radius of the end of the rib that is away from the center of the manifold is R2, which satisfies: 0.7R≤R2≤1R.

7. The busbar according to any one of claims 1-4, characterized in that, The raised rib is fan-shaped, and the central angle corresponding to the raised rib is α, which satisfies: 3°≤α≤10°.

8. The busbar according to any one of claims 1-4, characterized in that, There are multiple ribs, and along the circumferential direction, the multiple ribs and the multiple electrode lug welding parts are arranged alternately.

9. The busbar according to claim 8, characterized in that, The central angle β corresponding to the gap between two adjacent convex ribs along the circumferential direction satisfies: 25°≤β≤40°.

10. The busbar according to any one of claims 1-4, characterized in that, The busbar also includes a conductive handle, one end of which is connected to a portion of the outer edge of the busbar disk.

11. The busbar according to claim 10, characterized in that, The conductive handle includes a first connecting part and a second connecting part. The two ends of the first connecting part are respectively connected to the busbar and the second connecting part. The first connecting part is configured to melt when the current passing through it reaches a preset value.

12. The busbar according to claim 11, characterized in that, In the current flow direction perpendicular to the first connection portion, the first connection portion has two sides, and at least one of the sides is provided with a notch.

13. The busbar according to claim 11, characterized in that, The first connecting part is provided with a through hole.

14. An end cap assembly, characterized in that, include: Cover plate; A pole post is disposed on the cover plate; The lower plastic part is disposed on one side of the cover plate; And, as described in any one of claims 1-13, the manifold is located on the side of the lower plastic part away from the cover plate and is connected to the pole post.

15. A battery cell, characterized in that, include: The shell has a receiving cavity; The electrode assembly is disposed within the receiving cavity; A tab, one end of which is connected to the electrode assembly; And, as in claim 14, the end cap assembly, wherein the cover plate closes to the housing, and the other end of the electrode tab is connected to the electrode tab welding portion.

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