Tab and pole connecting piece and battery

Abstract

The utility model discloses a pole lug and pole connecting piece which comprises a main body part, the main body part is provided with a pole connecting part, the main body part is provided with a first surface connected with a pole lug, the first surface is provided with a concave part, and the concave part is configured to be a bending part for accommodating the pole lug and / or an electrode connecting piece. The concave part or the side notch of the tab and pole connecting piece is used for accommodating the bent part of the tab and / or the electrode connecting piece, and the height of the battery cell does not need to be sacrificed in the thickness direction of the main body part to avoid the bent part, so that the utilization rate of the internal space of the battery shell is ensured, and the high capacity of the battery is further maintained; the tab and pole connecting piece is made of metal, and the depressed part is beneficial to reducing the dead weight of the battery and improving the energy density of the battery. The utility model further discloses a battery comprising the tab and pole connecting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a pole ear and pole connector and a battery. Background Art

[0002] The battery cover mainly includes a cover body, a stop frame arranged on one side of the cover body in the thickness direction, and a tab-pole connector arranged on the side of the stop frame facing away from the cover body. The pole of the cover body passes through the stop frame and is connected to the tab-pole connector. The outer contour of the conventional tab-pole connector is a columnar structure extending along the thickness direction of the cover body, one of the two end faces of the columnar structure abuts against the stop frame, and the other is connected to the tab.

[0003] In the improved battery structure, the negative electrode tab and the negative electrode connecting sheet are welded to form a tab assembly. When winding the core, the protruding length of the tab on the side of the electrode sheet can be controlled to be smaller to solve the problem of inward folding of the overly long tab during high-speed winding. The tab assembly with a bending portion is connected to the tab pole connector, and the bending point is set at the negative electrode connecting sheet. Compared with a single-layer tab, the thickness of the negative electrode connecting sheet and the multi-tab stacking structure is larger, and the bending radius is also increased accordingly. In order to avoid the bent negative electrode connecting sheet damaging the side of the pole sheet at the end face of the core, the height of the core needs to be reduced accordingly, which further leads to a reduction in battery capacity. Utility Model Content

[0004] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide a pole tab and pole connector, which utilizes a recessed portion to accommodate the bent portion of the pole tab and / or electrode connecting sheet, thereby overcoming the defect that the bent portion with a predetermined bending radius damages the side edge of the pole sheet at the end face of the winding core.

[0005] In order to achieve the above-mentioned technical effects, the technical solution of the utility model is: a pole tab and pole post connector, comprising a main body, the main body being provided with a pole post connecting portion, the main body having a first surface connected to the pole tab or the electrode connecting sheet; the first surface being provided with a recessed portion, the recessed portion being configured to accommodate the bent portion of the pole tab and / or the electrode connecting sheet.

[0006] A preferred technical solution is that the recessed portion includes a first recessed portion and a second recessed portion;

[0007] The first recessed portion is configured to accommodate the bent portion of the electrode tab and / or the electrode connecting piece, and the second recessed portion is configured to accommodate the welding protrusion of the electrode column and the main body;

[0008] The depression depth of the second depression portion is smaller than the depression depth of the first depression portion.

[0009] A preferred technical solution is that the first recessed portion and the second recessed portion are connected to each other, and the recessed bottom surfaces of the first recessed portion and the second recessed portion are stepped surfaces or folded surfaces.

[0010] A preferred technical solution is that the concave bottom surface of the first concave portion has a first side edge and a second side edge that are opposite to each other, and the second side edge is located between the first side edge and the pole connecting portion;

[0011] The depth of the recess gradually decreases from the first side edge to the second side edge.

[0012] A preferred technical solution is that the pole connecting portion is a riveted portion.

[0013] A preferred technical solution is that the main body has a main body side surface extending along the thickness direction and located at the edge of the first surface, and the first recessed portion has a notch opened on the first surface and the main body side surface.

[0014] A preferred technical solution is that the first surface includes a planar area located on the side of the recessed portion, and the planar area is configured to be butted against and welded to the electrode tab or the electrode connecting piece.

[0015] A preferred technical solution is that the recessed portion and the pole connecting portion are arranged in sequence along a first direction in the first surface, and a second direction in the first surface intersects with the first direction;

[0016] The planar area includes a first area; the first area is arranged on at least one side of the pole connecting portion in the second direction.

[0017] A preferred technical solution is that the planar area includes a second area, and the second area is arranged on the side of the pole connecting portion away from the recessed portion.

[0018] A second object of the present utility model is to provide a battery, comprising the above-mentioned tab and pole connector.

[0019] The advantages and beneficial effects of the utility model are:

[0020] The recessed portion or the side notch of the tab and post connector is used to accommodate the bent portion of the tab and / or the electrode connecting piece, and there is no need to sacrifice the height of the battery cell in the thickness direction of the main body to avoid the bent portion, thereby ensuring the internal space utilization of the battery housing and maintaining the high capacity of the battery;

[0021] The pole lug and pole post connectors are made of metal, and the recessed portion helps reduce the battery's own weight and improve the battery's energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the pole ear and pole connector;

[0023] Figure 2 is along Figure 1 A cross-sectional view of the middle pole lug pole connector along the dotted line plane;

[0024] Figure 3 It is a schematic diagram of the structure of the battery's tab-pole connector and the tab, winding core and shell assembly.

[0025] Figure 4 yes Figure 3 A partial enlarged view of middle A;

[0026] Figure 5 is a cross-sectional view of a pole tab and pole connecting member of another embodiment along a dotted line plane;

[0027] Figure 6 It is an exploded view of the pole lug and pole connection parts, the stop frame and the cover plate assembly;

[0028] In the figure: 1, main body; 1a, first surface; 1b, side surface of main body; 101, pole connection part;

[0029] 102, recessed portion; 1021, first recessed portion; 1022, second recessed portion; 102a, first side edge; 102b, second side edge;

[0030] 103, plane area; 1031, first area; 1032, second area;

[0031] 2. Stop frame;

[0032] a, bending portion; a1, first bending surface; a2, second bending surface. DETAILED DESCRIPTION

[0033] The following examples are used to further describe the specific implementation of the present invention. The following examples are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0034] In the description of the present application, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] In the description of the present invention, "first", "second" and the like are used to distinguish different objects rather than to describe a specific order or a primary-secondary relationship.

[0037] Example

[0038] like Figure 1-5 As shown, the embodiment of the pole tab and pole post connector includes a main body 1, the main body 1 is provided with a pole post connecting portion 101, the main body 1 has a first surface 1a connected to the pole tab or the electrode connecting sheet; the first surface 1a is provided with a recessed portion 102, and the recessed portion 102 is configured to accommodate the bending portion a of the pole tab and / or the electrode connecting sheet.

[0039] The main body 1 is made of conductive material, usually metal. The material of the main body 1 connected to the negative electrode tab is compatible with the tab material. The material of the main body 1 used for the negative electrode can be copper, and the material of the main body 1 used for the positive electrode can be aluminum.

[0040] The function of the pole connection part 101 is to connect with the pole and form a current conduction structure. The pole connection part 101 and the pole are fixedly connected. Welding is conducive to forming a larger contact area on the connection surface, and has good firmness and vibration resistance. Specifically, welding is usually used in combination with other connection structures, and other connection structures include but are not limited to riveting and threaded connections.

[0041] Taking the negative electrode as an example, the first surface 1a includes the following two types: one is directly connected to the negative electrode tab, and the other is that the end of the negative electrode tab away from the winding core is connected to the negative electrode connecting sheet, and the end of the negative electrode connecting sheet away from the negative electrode tab is connected to the first surface 1a. The tab and the first surface 1a are usually connected by welding.

[0042] The recessed portion 102 is disposed on the first surface 1 a . The recessed portion 102 has a notch located on the first surface 1 a . The bottom surface of the recessed portion 102 is disposed opposite to the notch of the first surface 1 a .

[0043] Optionally, the recessed portion 102 is configured to accommodate the bent portion of the multi-layer tab stacking structure in the multi-tab battery, or accommodate the bent portion of the electrode connecting piece, or the bent portion is composed of the tab and the electrode connecting piece. The depth of the recessed portion 102 depends on the size of the tab stacking portion or the bent portion a of the electrode connecting piece to be accommodated.

[0044] like Figure 4 As shown, the bending portion a has a first bending surface a1 and a second bending surface a2 that are opposite to each other along the thickness direction of the main body 1. The first bending surface a1 is arranged toward the winding core, and the second bending surface a2 is arranged away from the winding core. The first bending surface a1 is arranged to be flat, so when the first bending surface a1 abuts against the flat end face of the winding core, there is no obvious protrusion that damages the end face of the battery cell and the electrode sheet. Limited by the thickness of the electrode connecting sheet itself, the second bending surface a2 is in the shape of an arc. The bending portion a is accommodated in the recessed portion 102 to ensure that the second bending surface a2 and the first bending surface a1 do not deform significantly during the assembly and use of the battery, so that the second surface maintains a flat contact with the end face of the winding core.

[0045] like Figure 1 As shown, in another preferred embodiment, the recessed portion 102 includes a first recessed portion 1021 and a second recessed portion 1022; the first recessed portion 1021 is configured to accommodate the bent portion a of the bent electrode ear or the bent electrode connecting piece, and the second recessed portion 1022 is configured to accommodate the welding protrusion between the electrode column and the main body 1; the recessed depth of the second recessed portion 1022 is less than the recessed depth of the first recessed portion 1021.

[0046] It can be understood that the size of the welding protrusion between the pole and the main body 1 along the thickness direction of the main body 1 is smaller than the size of the bending portion a, especially the bending portion a of the multi-layer pole tab or electrode connecting sheet.

[0047] The first recessed portion 1021 and the second recessed portion 1022 may be optionally spaced apart from each other.

[0048] like Figure 1-5 As shown, in another preferred embodiment, the first recessed portion 1021 and the second recessed portion 1022 are connected to each other, and the recessed bottom surfaces of the first recessed portion 1021 and the second recessed portion 1022 are stepped surfaces or folded surfaces.

[0049] The concave bottom of the folded surface is Figure 2 As shown, the stepped concave bottom is Figure 5 shown.

[0050] Compared with the first recessed portion 1021 and the second recessed portion 1022 which are arranged at intervals from each other, the recessed portion 102 which is arranged in communication with each other is more conducive to further reducing the deadweight of the tab-pole connector.

[0051] The stepped recessed bottom surfaces of the first recessed portion 1021 and the second recessed portion 1022 are connected by recessed side surfaces extending in the thickness direction of the main body, and the edges at the angles between the recessed side surfaces and the recessed bottom surfaces of the second recessed portion 1022 are butted against an obtuse angle; in the closing operation after the tab or electrode connecting piece is bent, the above edges are butted against the tab or electrode connecting piece to cause it to bend.

[0052] like Figure 4 As shown, the second curved surface a2 is an arc surface with an opening downward, and the two sides of the second curved surface a2 along the length extension direction are lower than the middle area. The concave bottom surface of the first concave portion 1021 can be optionally consistent with the shape of the entire second curved surface a2, or can be consistent with the shape of part of the second curved surface a2.

[0053] like Figure 1 As shown, in another preferred embodiment, the bottom surface of the first recessed portion 1021 has a first side 102a and a second side 102b opposite to each other, and the second side 102b is located between the first side 102a and the pole connecting portion 101; the recessed depth gradually decreases from the first side 102a to the second side 102b.

[0054] When the concave bottom surface of the first concave portion 1021 is consistent with the shape of the entire second bent surface a2, when the winding core vibrates radially, the concave bottom surface located on the side of the bent portion a away from the pole connector exerts a radial force on the end surface of the winding core on the bent portion a, increasing the deformation probability of the bent portion a. Based on this, as an alternative, the local concave bottom surface located on the side of the bent portion a away from the pole connector must be sandwiched with a sufficient gap from the bent portion a.

[0055] Relative to the first surface 1 a , the bottom surface of the depression having the first side edge 102 a and the second side edge 102 b is an inclined surface, such as an inclined slope or a curved surface.

[0056] In some embodiments, the pole connection portion 101 is a riveted portion.

[0057] The pole passes through the connector, and the pole and the pole lug-pole connector are welded and connected, making the assembly operation convenient and quick.

[0058] like Figure 1 As shown, in another preferred embodiment, the main body 1 has a main body side surface 1b extending along the thickness direction and located at the edge of the first surface 1a, and the first recessed portion 1021 has a notch opened on the first surface 1a and the main body side surface 1b.

[0059] In this embodiment, the first recessed portion 1021 is disposed at the edge of the first surface 1a. There is no structural member to abut the side of the bent portion a away from the pole connecting portion 101. When the winding core vibrates radially, the bent portion a will not be deformed by the radial force of the winding core end surface, causing the first bent surface a1 to deform.

[0060] There is no structural member to abut the side of the bent portion a away from the pole connecting portion 101, which is also beneficial to reducing the deadweight of the pole tab pole connecting member.

[0061] like Figure 1As shown, in another preferred embodiment, the first surface 1 a includes a plane area 103 located on the side of the recessed portion 102 , and the plane area 103 is configured to be butted against and welded with the electrode tab or the electrode connecting piece.

[0062] The tab or electrode connector is welded against the plane area 103 , further increasing the welding interface area of ​​the tab or electrode connector.

[0063] like Figure 1 As shown, in another preferred embodiment, the recessed portion 102 and the pole connecting portion 101 are arranged along a first direction ( Figure 1 X direction) are arranged in sequence, and the second direction ( Figure 1 The plane area 103 includes a first area 1031; the first area 1031 is arranged on at least one side of the second direction of the pole connecting portion 101.

[0064] In this embodiment, the first direction is perpendicular to the second direction, the first region 1031 is arranged on both sides of the second direction of the pole connecting portion 101, and the pole ear or electrode connecting sheet is in full contact with the first region 1031, which is beneficial to increase the welding interface area between the pole ear or electrode connecting sheet and the pole ear pole connector.

[0065] like Figure 1 As shown, in another preferred embodiment, the plane region 103 includes a second region 1032 , and the second region 1032 is arranged on the side of the pole connecting portion 101 away from the recessed portion 102 .

[0066] The second region 1032 is in full contact with the pole tab or the electrode connecting piece, which is beneficial to increase the welding interface area between the pole tab or the electrode connecting piece and the pole tab and pole column connector.

[0067] In this embodiment, the first region 1031 and the second region 1032 are provided simultaneously, and the first region 1031 and the second region 1032 are in an open ring shape and surround the outer periphery of the pole connecting portion 101 .

[0068] like Figure 6 As shown, in some embodiments of the battery, the tab and post connector of the above embodiments is included. It can be understood that the known structural parts of the battery such as the stop frame, the cover plate, the winding core, the stop frame 2, etc. are also included.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A pole tab and pole post connector, comprising a main body, the main body being provided with a pole post connecting portion, the main body having a first surface connected to a pole tab or an electrode connecting sheet; characterized in that: The first surface is provided with a recessed portion, and the recessed portion is configured to accommodate the electrode tab and / or the bent portion of the electrode connecting sheet.

2. The terminal lug and terminal connector according to claim 1, characterized in that: The recessed portion includes a first recessed portion and a second recessed portion; The first recessed portion is configured to accommodate the bent portion of the electrode tab and / or the electrode connecting piece, and the second recessed portion is configured to accommodate the welding protrusion of the electrode column and the main body; The depression depth of the second depression portion is smaller than the depression depth of the first depression portion.

3. The pole tab and pole connector according to claim 2, characterized in that: The first recessed portion and the second recessed portion are connected to each other, and the recessed bottom surfaces of the first recessed portion and the second recessed portion are stepped surfaces or folded surfaces.

4. The pole tab and pole connector according to claim 2, characterized in that: The concave bottom surface of the first concave portion has a first side edge and a second side edge opposite to each other, and the second side edge is located between the first side edge and the pole connecting portion; The depth of the recess gradually decreases from the first side edge to the second side edge.

5. The pole tab and pole connector according to claim 1, characterized in that: The pole connecting portion is a riveted portion.

6. The pole tab and pole connector according to claim 2, characterized in that: The main body portion has a main body side surface extending along the thickness direction and located at the edge of the first surface, and the first recessed portion has a notch opened on the first surface and the main body side surface.

7. The pole tab and pole connector according to claim 1, characterized in that: The first surface includes a planar area located on the side of the recessed portion, and the planar area is configured to be butted against and welded to the electrode tab or the electrode connecting piece.

8. The pole tab and pole connector according to claim 7, characterized in that: The recessed portion and the pole connecting portion are arranged in sequence along a first direction in the first surface, and a second direction in the first surface intersects with the first direction; The planar area includes a first area; the first area is arranged on at least one side of the pole connecting portion in the second direction.

9. The pole tab and pole connector according to claim 7, characterized in that: The planar area includes a second area, and the second area is arranged on a side of the pole connecting portion away from the recessed portion.

10. A battery, characterized in that: The invention comprises the pole lug and pole connecting piece as claimed in any one of claims 1 to 9.

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