Connection and battery

Abstract

The utility model relates to energy storage equipment technical field especially, more particularly to a connecting piece and battery, connecting piece includes first and second, one side end surface of first is welded in the output of cover plate structure, one side end surface of second is welded in the pole lug, first and second are all plate structure, the wall thickness of first is A, the wall thickness of second is B, satisfy: A is less than B. Through the two parts of connecting piece welding output end and welding pole lug are set to the plate structure of unequal wall thickness, can guarantee the part of welding with pole lug not to deform simultaneously, can also reduce weight and cost, improve the energy density and economic benefits of battery. The battery includes cover plate structure, pole group and above connecting piece, first and the output of cover plate structure weld, second and the pole lug of pole group weld. The battery can prevent the part of welding with pole lug from deforming, also can reduce weight and cost.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a connector and a battery. Background Technology

[0002] Existing batteries typically use connectors to connect the terminals and tabs. The welded portion between the connector and the tab is relatively narrow, and insufficient thickness can easily lead to weld deformation. To ensure consistent thickness throughout the connector, the welded portion also needs to be thicker. However, this welded portion is actually quite wide and doesn't require excessive thickness. Furthermore, increasing the connector thickness increases overall weight and cost, which is detrimental to improving battery energy density and economic efficiency. Utility Model Content

[0003] One objective of this invention is to provide a connector that can prevent deformation of the part welded to the electrode tab, and also reduce weight and cost.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A connector is provided, comprising a first part and a second part. One end face of the first part is welded to the output end of a cover plate structure, and one end face of the second part is welded to a tab. Both the first part and the second part are plate-shaped structures. The wall thickness of the first part is A, and the wall thickness of the second part is B, satisfying that A is less than B.

[0006] Optionally, the wall thickness A of the first part and the wall thickness B of the second part satisfy: 0.2mm≤BA≤1.5mm.

[0007] Optionally, the wall thickness of the connector is less than or equal to 3 mm and greater than or equal to 0.5 mm.

[0008] Optionally, the plate surface of the first part is parallel to the plate surface of the second part, and along the normal of the plate surface of the first part, the height difference between the plate surface of the first part facing the pole group and the plate surface of the second part facing the pole group is N, satisfying 0.2mm≤N≤1mm.

[0009] Optionally, the first end face of the first part faces the output end, and the first end face has a first rough area, the first rough area includes a first welding area, and the first welding area is welded to the output end;

[0010] And / or, the second end face of the second part faces the electrode tab, the second end face has a second rough area, the second rough area includes a second welding area, the second welding area is welded to the electrode tab.

[0011] Optionally, the first roughened region is an embossed surface, and the embossing depth of the embossed surface is 0.2mm-0.6mm;

[0012] And / or, the second roughened region is an embossed surface, and the embossing depth of the embossed surface is 0.2mm-0.6mm;

[0013] And / or, the first rough area is a frosted surface;

[0014] And / or, the second rough area is a frosted surface.

[0015] Optionally, it also includes a bending portion for connecting the first portion and the second portion, wherein the connection between the bending portion and the first portion is configured as a curved surface transition, and the connection between the bending portion and the second portion is configured as a curved surface transition.

[0016] Optionally, the corners of the connectors are all rounded or have a notched corner structure.

[0017] Another objective of this invention is to provide a battery that can prevent deformation of the part welded to the electrode tabs, and also reduce weight and cost.

[0018] To achieve this objective, the present invention adopts the following technical solution:

[0019] A battery is provided, including a cover plate structure, an electrode assembly, and the aforementioned connector, wherein a first part is welded to the output end of the cover plate structure, and a second part is welded to the tabs of the electrode assembly.

[0020] Optionally, the cover structure includes a top cover and a plastic part, the plastic part being at least partially attached to the end face of the top cover facing the electrode group, the connector being located on the side of the plastic part facing the electrode group, the second part being parallel to the third end face of the plastic part facing the electrode group, and the vertical distance M between the second part and the third end face satisfying: 0.2mm≤M≤1mm.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a connector, including a first part and a second part. One end face of the first part is welded to the output end of a cover plate structure, and one end face of the second part is welded to a tab. Both the first part and the second part are plate-shaped structures. The wall thickness of the first part is A, and the wall thickness of the second part is B, satisfying that A is less than B. By setting the two parts of the connector—the part welded to the output end and the part welded to the tab—as plate-shaped structures with unequal wall thicknesses, it is possible to ensure that the part welded to the tab will not deform, while also reducing weight and cost, and improving the energy density and economic efficiency of the battery.

[0023] This invention also provides a battery, including a cover plate structure, an electrode assembly, and the aforementioned connectors. A first part is welded to the output end of the cover plate structure, and a second part is welded to the tabs of the electrode assembly. This battery can prevent deformation of the portion welded to the tabs and also reduces weight and cost. Attached Figure Description

[0024] Figure 1 This is a first-view structural schematic diagram of the connector (first structure) provided in an embodiment of the present utility model;

[0025] Figure 2 This is a second-view structural schematic diagram of the connector (first structure) provided in an embodiment of the present utility model;

[0026] Figure 3 This is a third-view structural schematic diagram of the connector (first structure) provided in the embodiment of this utility model;

[0027] Figure 4 This is a structural schematic diagram of the connector (second structure) provided in this embodiment of the utility model;

[0028] Figure 5 This is a partial structural schematic diagram of the battery provided in an embodiment of the present utility model;

[0029] Figure 6 yes Figure 5 Sectional view of AA;

[0030] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0031] In the picture:

[0032] 1. Connector; 11. First part; 111. First end face; 1111. First rough area;

[0033] 12. Second part; 121. Second end face; 13. Bending part; 14. Rounded corner;

[0034] 2. Cover plate structure; 21. Pole post; 22. Plastic parts; 221. Third end face; 23. Riveting parts; 24. Upper plastic; 25. Sealing ring; 26. Top cover. Detailed Implementation

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Existing batteries typically use connectors to connect the terminals and tabs. The welded portion between the connector and the tab is relatively narrow, and insufficient thickness can easily lead to weld deformation. To ensure consistent thickness throughout the connector, the welded portion also needs to be thicker. However, this welded portion is actually quite wide and doesn't require excessive thickness. Furthermore, increasing the connector thickness increases overall weight and cost, which is detrimental to improving battery energy density and economic efficiency.

[0039] Therefore, this embodiment provides a connector 1 to solve the above problems. The connector 1 can prevent the part welded to the electrode tab from deforming and can also reduce weight and cost.

[0040] like Figures 1-7 As shown, the connector 1 in this embodiment includes a first part 11 and a second part 12. One end face of the first part 11 is welded to the output end of the cover plate structure 2, and one end face of the second part 12 is welded to the tab. Both the first part 11 and the second part 12 are plate-shaped structures. The wall thickness of the first part 11 is A, and the wall thickness of the second part 12 is B, satisfying that A is less than B. By setting the two parts of the connector 1—the part welded to the output end and the part welded to the tab—as plate-shaped structures with unequal wall thicknesses, it is possible to ensure that the part welded to the tab will not deform, while also reducing weight and cost, and improving the energy density and economic efficiency of the battery. In this embodiment, the output end is the terminal post 21 in the figure.

[0041] like Figure 7As shown, optionally, the wall thickness A of the first part 11 and the wall thickness B of the second part 12 satisfy: 0.2mm ≤ B ≤ 1.5mm. If the difference between the wall thickness B of the second part 12 and the wall thickness A of the first part 11 is less than 0.2mm, the difference is too small, and the effect on balancing the welding strength of the electrode tab and reducing weight and cost is too small. If the difference between the wall thickness B of the second part 12 and the wall thickness A of the first part 11 is greater than 1.5mm, the difference is too large. In this case, the wall thickness A of the first part 11 is too small, or the wall thickness B of the second part 12 is too large. The former is prone to welding deformation of the first part 11, resulting in a smaller contact area between the first part 11 and the output terminal, which is not conducive to ensuring current flow. The latter is prone to the overall weight still being too large. Furthermore, when the difference between the wall thickness B of the second part 12 and the wall thickness A of the first part 11 is too large, the connection between the two is also prone to deformation under stress.

[0042] Optionally, the wall thickness of connector 1 is less than or equal to 3mm and greater than or equal to 0.5mm. That is, the thickness at the thickest point of connector 1 is less than or equal to 3mm, and the wall thickness at any point on connector 1 cannot exceed 3mm, to avoid excessive overall or local wall thickness, resulting in excessive weight and cost. Optionally, the thickness at the thinnest point of connector 1 is greater than or equal to 0.5mm, meaning the wall thickness at any point on connector 1 cannot be less than 0.5mm, to avoid insufficient local wall thickness, leading to insufficient local structural strength for welding or deformation under stress.

[0043] To minimize the height space occupied by the output terminal and the tabs within the battery, the first part 11 and the second part 12 are positioned at different heights. Optionally, the connector 1 further includes a bending part 13 for connecting the first part 11 and the second part 12. Optionally, the plate surface of the first part 11 is parallel to the plate surface of the second part 12, and both are parallel to the end faces of adjacent electrode groups, as well as the end face of the top cover 26 of the cover structure 2.

[0044] Optionally, the vertical distance between the first part 11 and the end face of the electrode group is less than the vertical distance between the second part 12 and the end face of the electrode group, that is, the second part 12 is closer to the top cover 26, so as to provide a certain accommodation space for the electrode tab, which can save the height space inside the battery and help improve the volumetric energy density of the battery.

[0045] Optionally, along the normal direction of the plate surface of the first part 11, the height difference between the plate surface of the first part 11 facing the electrode group and the plate surface of the second part 12 facing the electrode group is N, satisfying 0.2mm≤N≤1mm. If the height difference between the plate surface of the first part 11 facing the electrode group and the plate surface of the second part 12 facing the electrode group is less than 0.2mm, the increase in the accommodation space provided for the electrode tab is small, and the effect on improving the volumetric energy density of the battery is too small. If the height difference between the plate surface of the first part 11 facing the electrode group and the plate surface of the second part 12 facing the electrode group is greater than 1mm, the bending angle of the bending part 13 is too large, or the width of the bending part 13 is too large, which is also detrimental to the structural strength of the bending part 13 and the arrangement of the connector 1 in the battery.

[0046] Optionally, the connection between the bent portion 13 and the first portion 11 is set as a curved transition, and the connection between the bent portion 13 and the second portion 12 is set as a curved transition, so as to ensure that the connector 1 does not have sharp bending edges, which can prevent scratching the tabs or other components inside the battery.

[0047] Optionally, this embodiment provides two different structures for the connector 1. For example... Figure 1 As shown, in the first type of connector 1, a first part 11 and a second part 12 are sequentially arranged along a first direction. The second part 12 is generally C-shaped, and two oppositely arranged strip areas of the second part 12 are used for welding electrode tabs, and both strip areas extend along the first direction. Figure 4 As shown, the second part 12 of the connector 1 of the second type of structure consists of two strip structures. Both strip structures extend along the first direction, but the two strip structures are respectively connected to the two sides of the first part 11 along the second direction. The second direction is perpendicular to the first direction, and both directions are parallel to the plate surface of the first part 11.

[0048] like Figure 2 As shown, optionally, the first end face 111 of the first part 11 faces the output end, and the first end face 111 has a first rough area 1111 to improve the welding effect. The first rough area 1111 includes a first welding area, that is, the first welding area is located within the first rough area 1111, and the first welding area is welded to the output end.

[0049] Optionally, the second end face 121 of the second part 12 faces the electrode tab, and the second end face 121 has a second rough area, which includes a second welding area, that is, the second welding area is located in the second rough area and the second welding area is welded to the electrode tab.

[0050] Optionally, the first roughened region 1111 is an embossed surface with an embossing depth of 0.2mm-0.6mm. If the embossing depth is less than 0.2mm, the embossed surface is insufficient to strengthen the weld. If the embossing depth is greater than 0.6mm, excessive embossing can easily cause low local structural strength of the connector 1.

[0051] Optionally, the second roughened area is an embossed surface with an embossing depth of 0.2mm-0.6mm. Similarly, if the embossing depth is less than 0.2mm, the embossing surface is insufficient to strengthen the weld. If the embossing depth is greater than 0.6mm, excessive embossing can easily cause low local structural strength in the connector 1.

[0052] Optionally, in other embodiments, the first roughened region 1111 may also be configured as a frosted surface. Optionally, in other embodiments, the second roughened region may also be configured as a frosted surface.

[0053] Optionally, the corners of the connector 1 are all rounded 14 or have a notched corner structure to prevent sharp corners from scratching the components inside the battery.

[0054] This embodiment also provides a battery, including a cover structure 2, an electrode assembly, and the aforementioned connector 1. A first part 11 is welded to the output end of the cover structure 2, and a second part 12 is welded to the tabs of the electrode assembly. This battery can prevent deformation of the portion welded to the tabs and also reduces weight and cost.

[0055] Optionally, the cover structure 2 includes a top cover 26 and a plastic part 22. The plastic part 22 is at least partially attached to the end face of the top cover 26 facing the electrode assembly, and the connector 1 is located on the side of the plastic part 22 facing the electrode assembly. Optionally, in this embodiment, the cover structure 2 further includes a riveting member 23, an upper plastic part 24, and a sealing ring 25. The riveting member 23 is used to fix the outward-facing end of the electrode assembly, and the first part 11 of the connector 1 is welded to the bottom plate of the electrode post 21 located inside the battery. The upper plastic part 24 is located between the riveting member 23 and the top cover 26, and the sealing ring 25 is sleeved on the electrode post 21 and sandwiched between the inner wall of the through hole of the electrode post 21 and the top cover 26.

[0056] Optionally, such as Figure 7 As shown, the second part 12 is parallel to the third end face 221 of the plastic part 22 facing the electrode assembly. The vertical distance M between the second part 12 and the third end face 221 satisfies: 0.2mm ≤ M ≤ 1mm. If the vertical distance M between the second part 12 and the third end face 221 is less than 0.2mm, the second part 12 is too close to the insulating part. In the presence of processing errors and assembly errors, the second part 12 will press against the insulating part, affecting the welding strength between the first part 11 and the electrode post 21. If the vertical distance M between the second part 12 and the third end face 221 is greater than 1mm, the distance between the second part 12 and the insulating part is too far, thus occupying too much height space inside the battery.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A connector, characterized in that, It includes a first part (11) and a second part (12). One end face of the first part (11) is welded to the output end of the cover plate structure (2), and one end face of the second part (12) is welded to the electrode tab. Both the first part (11) and the second part (12) are plate-shaped structures. The wall thickness of the first part (11) is A, and the wall thickness of the second part (12) is B, satisfying that A is less than B.

2. The connector according to claim 1, characterized in that, The wall thickness A of the first part (11) and the wall thickness B of the second part (12) satisfy: 0.2mm≤BA≤1.5mm.

3. The connector according to claim 1, characterized in that, The wall thickness of the connector (1) is less than or equal to 3 mm and greater than or equal to 0.5 mm.

4. The connector according to claim 1, characterized in that, The plate surface of the first part (11) is parallel to the plate surface of the second part (12). Along the normal of the plate surface of the first part (11), the height difference between the plate surface of the first part (11) facing the pole group and the plate surface of the second part (12) facing the pole group is N, which satisfies 0.2mm≤N≤1mm.

5. The connector according to any one of claims 1-4, characterized in that, The first end face (111) of the first part (11) faces the output end, and the first end face (111) has a first rough area (1111), which includes a first welding area, and the first welding area is welded to the output end. And / or, the second end face (121) of the second part (12) faces the tab, the second end face (121) has a second rough area, the second rough area contains a second welding area, the second welding area is welded to the tab.

6. The connector according to claim 5, characterized in that, The first rough area (1111) is an embossed surface, and the embossing depth of the embossed surface is 0.2mm-0.6mm; And / or, the second roughened region is an embossed surface, and the embossing depth of the embossed surface is 0.2mm-0.6mm; And / or, the first rough area (1111) is a frosted surface; And / or, the second rough area is a frosted surface.

7. The connector according to any one of claims 1-4, characterized in that, It also includes a bending portion (13), which is used to connect the first portion (11) and the second portion (12). The connection between the bending portion (13) and the first portion (11) is set as a curved surface transition, and the connection between the bending portion (13) and the second portion (12) is set as a curved surface transition.

8. The connector according to any one of claims 1-4, characterized in that, The corners of the connectors (1) are all rounded (14) or have a missing corner structure.

9. A battery, characterized in that, It includes a cover plate structure (2), an electrode assembly, and a connector as described in any one of claims 1-8, wherein the first part (11) is welded to the output end of the cover plate structure (2), and the second part (12) is welded to the electrode lug of the electrode assembly.

10. The battery according to claim 9, characterized in that, The cover structure (2) includes a top cover (26) and a plastic part (22). The plastic part (22) is at least partially attached to the end face of the top cover (26) facing the electrode group. The connector (1) is located on the side of the plastic part (22) facing the electrode group. The second part (12) is parallel to the third end face (221) of the plastic part (22) facing the electrode group. The vertical distance M between the second part (12) and the third end face (221) satisfies: 0.2mm≤M≤1mm.

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