CN216213958U

CN216213958U - Multi-tab battery core and battery

Info

Publication number: CN216213958U
Application number: CN202122540657.5U
Authority: CN
Inventors: 陈俊涛; 郭建伟
Original assignee: Apower Electronics Co ltd
Current assignee: Apower Electronics Co ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-04-05
Anticipated expiration: 2031-10-21

Abstract

The utility model belongs to the technical field of batteries and discloses a multi-tab battery cell and a battery. The multi-tab battery cell comprises a diaphragm and two pole pieces, wherein the two pole pieces are separated by the diaphragm and wound to form a battery cell body; each pole piece comprises a welding pole lug, a substrate and a plurality of connecting pole lugs, when the substrate is unfolded, two ends of the welding pole lug respectively protrude out of the substrate to form a welding part and a connecting part, and a plurality of connecting pole lugs are arranged on one side edge of the substrate at intervals along the second direction; after the substrate is wound along the second direction to form the battery cell body, the plurality of connecting lugs and the welding portion are welded to form the welding end of the battery cell body. The multi-tab battery cell improves the utilization rate of the battery cell and the battery space under the condition of not reducing the welding area, and the welding part is stable and firm.

Description

Multi-tab battery core and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a multi-tab battery cell and a battery.

Background

Lithium ion batteries have the advantages of light weight, good safety performance and the like, so that the application in the fields of mobile electronic equipment such as Bluetooth headsets, mobile phones, notebook computers, tablet computers, cameras and the like, portable mobile power supplies and the like is monopolized. Meanwhile, lithium ion batteries have also been applied in the fields of electric motorcycles, electric automobiles, and the like in batches.

The tab is a key component of a lithium ion battery product. The battery comprises a positive electrode and a negative electrode, wherein the tabs are metal conductors leading out the positive electrode and the negative electrode from the battery core, namely the tabs of the positive electrode and the negative electrode of the battery are contact points during charging and discharging. This contact point is not a copper plate visible from the outside of the battery, but a connection piece inside the battery for connecting a pole on the battery case. The tab is generally made of three materials, wherein the positive electrode of the battery is made of aluminum (Al) material, the negative electrode of the battery is made of nickel (Ni) material, and the negative electrode of the battery is also made of copper nickel (Ni-Cu) material, which are compounded by a film and a metal belt.

The development of the multi-tab technology not only greatly improves the charging speed of the lithium ion battery, but also achieves the effect of multi-path charging and discharging in one cell, and therefore higher impedance can not be brought, and the heating capacity and cell loss can be reduced while the charging power is doubled. After the winding process of the conventional multi-lug battery cell, a plurality of positive connectors are welded to a positive lug, and a plurality of negative connectors are welded to a negative lug, so that the battery cell cannot exert capacity in a welding area, and the problem of low space utilization rate exists; in order to improve the space utilization, the size of the welding area needs to be reduced, which brings the risk of poor welding and increases the resistance of the cell.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multi-tab battery cell and a battery, wherein the multi-tab battery cell improves the space utilization rate of the battery cell under the condition of not reducing the welding area, and the welding part is stable and firm.

In order to achieve the purpose, the utility model adopts the following technical scheme:

one object of the present invention is to provide a multi-tab battery cell, which includes a diaphragm and two pole pieces, wherein the two pole pieces are separated by the diaphragm and wound to form a battery cell body; the pole piece comprises a welding pole lug, a substrate and a plurality of connecting pole lugs, when the substrate is unfolded, the welding pole lug is fixed on the substrate along a first direction, two ends of the welding pole lug respectively protrude out of the substrate to form a welding part and a connecting part, and the connecting part is used for connecting the battery shell; a plurality of connecting lugs are arranged on one side edge of the substrate at intervals along the second direction, and after the substrate is wound along the second direction to form the cell body, the plurality of connecting lugs and the welding part are welded to form a welding end of the cell body; the first direction is perpendicular to the second direction.

Alternatively, the welding portion may be overlapped with a plurality of connection tabs after being wound to form the cell body.

Optionally, the dimension of the connection tab in the second direction is not smaller than the dimension of the weld portion in the second direction.

Optionally, the dimension of the welding portion in the first direction is not greater than the dimension of the cell body in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

Optionally, the dimension of the connection tab exceeding the substrate along the first direction is not greater than the dimension of the cell body along the third direction.

Optionally, the connecting portion is sleeved with a tab film.

Optionally, the connecting portions on the two pole pieces are located on the same side of the battery cell body and are arranged in a staggered manner.

Optionally, the battery cell further comprises a coating layer, and the coating layer coats the peripheral wall surface and the welding end of the battery cell body.

Has the advantages that: the two ends of the multi-lug battery core welding lug respectively protrude out of the substrate to form a welding part and a connecting part, the connecting part is used for connecting a battery shell, and the welding part and the plurality of connecting lugs are welded to form a welding end of the battery core body after the battery core body is formed by winding. This many utmost point ears electricity core has improved the utilization ratio in electric core space under the condition that does not reduce welding area to the welding position is firm.

Another object of the present invention is to provide a battery, which includes a battery case and a multi-tab electric core as set forth in any of the above aspects disposed inside the battery case, wherein the above-mentioned connecting portion is connected to the battery case.

Has the advantages that: the battery provided by the utility model uses the multi-tab battery cell, improves the space utilization rate of the battery, increases the energy density of the battery and ensures that the impedance of the battery is not increased under the condition of not reducing the welding area.

Drawings

FIG. 1 is a schematic structural diagram of a pole piece provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a multi-tab battery cell according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a multi-tab battery cell after being overmolded, according to an embodiment of the present invention.

In the figure:

100. welding a tab; 110. welding the part; 111. a positive electrode welding part; 112. a negative electrode welding part; 120. a connecting portion; 121. a positive electrode connecting part; 122. a negative electrode connecting part; 130. tab films;

200. a substrate; 210. connecting the tabs; 211. the positive electrode is connected with a tab; 212. the negative electrode is connected with a tab;

300. an active material layer;

400. a cell body; 410. and (4) coating.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The following describes a preferred embodiment of the multi-tab battery cell provided in this embodiment with reference to the accompanying drawings. In the present invention, the first direction is the X direction shown in fig. 1, the second direction is the Y direction shown in fig. 2, and the third direction is the Z direction shown in fig. 2 and 3. In the embodiment of the utility model, the multi-tab battery cell is a square winding battery cell. Of course, it is conceivable for the person skilled in the art that the multi-tab cell can also be a cylindrically wound cell. Furthermore, the multi-tab battery cell can be manufactured into a laminated battery cell by cutting the pole pieces.

Referring to fig. 1, fig. 1 is a schematic diagram of a pole piece structure provided in this embodiment. The multi-tab battery cell provided by this embodiment includes a diaphragm and two pole pieces, and the two pole pieces are separated by the diaphragm and wound to form a battery cell body 400; the pole piece comprises a welding pole lug 100, a substrate 200 and a plurality of connecting pole lugs 210, when the substrate 200 is unfolded, the welding pole lug 100 is fixed on the substrate 200 along a first direction, the first direction is the width direction of the substrate 200, and the second direction is the length direction of the substrate 200; both ends of the tab 100 are welded to protrude out of the substrate 200 to form a welded part 110 and a connection part 120, respectively, the connection part 120 being used for connecting a battery case; a plurality of connection tabs 210 are disposed on one side of the substrate 200, that is, on one long side of the substrate 200, at intervals along the second direction, after the substrate is wound along the second direction to form the cell body 400, the plurality of connection tabs 210 and the welding portion 110 are welded to form a welding end of the cell body 400. Alternatively, the welding tab 100 is fixed to one end of the substrate 200 in the second direction in the first direction. It can be understood that, one of the two pole pieces is a positive pole piece, the other is a negative pole piece, the positive pole piece and the negative pole piece are provided with active material layers 300, the positive pole piece and the negative pole piece are separated by a diaphragm, and the peripheral edge of the diaphragm exceeds the peripheral edge of the pole pieces so as to prevent the short circuit of the pole pieces; the first direction is a width direction of the substrate 200, the second direction is a length direction of the substrate 200, and the first direction and the second direction are perpendicular to each other. This many utmost point ears electricity core has improved the space utilization of electricity core under the condition that does not reduce welding area to it is firm more to make the welding position.

Alternatively, the welding tab 100 and the connection tab 210 may be tabs made of aluminum, which are used as positive electrode tabs, and may also be used as negative electrode tabs if the battery uses lithium titanate as the negative electrode. The welding tab 100 and the connection tab 210 may also be tabs made of nickel, which are used as negative electrode tabs mainly used on small digital batteries, such as: cell-phone battery, portable power source battery, panel computer battery, intelligent transmission equipment battery etc.. The welding tab 100 and the connection tab 210 can also be tabs made of nickel-plated copper, and are used as negative electrode tabs applied to power batteries and high-rate batteries.

Preferably, the connecting portion 120 is sleeved with a tab film 130. The tab film 130 is an insulating part on the tab, and functions to prevent conduction between the metal band and the aluminum-plastic film during battery packaging, and to prevent leakage by being thermally fused and sealed with the aluminum-plastic film during packaging. The tab film 130 may be yellow, white or black film. It is conceivable that the film is a conventional use of a soft package battery, and when the battery core needs to be made into an aluminum-shell battery, the tab film 130 may be replaced by an insulating adhesive tape, which may be specifically selected according to the processing requirements and the processing technology of the battery core, and this embodiment is not particularly limited.

Preferably, the welding part 110 can be overlapped with the plurality of connection tabs 210 after the cell body 400 is wound. Weld part 110 overlaps together with a plurality of connection utmost point ear 210 after electric core coiling shaping, can further reduce the area and the volume that the welding end took, has increased the space utilization of electric core, makes the welding operation simple more convenient simultaneously. Further, the size of the connection tab 210 in the second direction is not less than the size of the welding portion 110 in the second direction, i.e., the width of the connection tab 210 is greater than or equal to the width of the welding portion 110. The connection tab 210 and the welding tab 100 arranged in this way can completely cover the welding part 110 after the battery core is wound and formed, so that the dislocation of the connection tab 210 and the welding part 110 is prevented, the welding difficulty is reduced, and the impedance of the welding end is reduced.

Referring to fig. 2, fig. 2 is a schematic structural diagram of the multi-tab battery cell formed by winding in this embodiment. As a preferred embodiment, the dimension of the welding part 110 in the first direction is not greater than the dimension of the cell body 400 in the third direction. Further, the dimension of the connection tab 210 beyond the substrate 200 in the first direction is not greater than the dimension of the cell body 400 in the third direction. It can be understood that the third direction is a thickness direction of the cell body 400, and the first direction, the second direction and the third direction are perpendicular to each other. It is conceivable that the multi-tab battery cell is formed by winding a positive plate and a negative plate separated by a separator, and the welding tabs 100 corresponding to the positive and negative plates are a positive welding tab and a negative welding tab, respectively, so that the welding portion 110 includes a positive welding portion 111 and a negative welding portion 112, the connection tab 210 includes a positive connection tab 211 and a negative connection tab 212, the corresponding positive welding end is formed by welding a plurality of positive connection tabs 211 with the positive welding portion 111, and the negative welding end is formed by welding a plurality of negative connection tabs 212 with the negative welding portion 112. Under this structure, positive electrode weld portion 111, negative electrode weld portion 112, anodal tab 211 and the length that negative electrode tab 212 exceeds substrate 200 all are not greater than the thickness of electric core body 400 for when buckling and pasting the terminal surface of locating electric core body 400 with positive electrode weld end and negative electrode weld end along the third direction, positive electrode weld end and negative electrode weld end all can not exceed the terminal surface edge of electric core body 400, just need not tailor positive electrode weld end and negative electrode weld end this moment. It can be thought that after the winding, when the length of the welding end exceeds the thickness of the cell body 400, the welding end needs to be cut out, so that the welding end does not exceed the thickness of the cell body 400, the space occupied by the welding end is reduced, and the space utilization rate of the cell is improved.

Further, the positive electrode connection portion 121 on the positive electrode tab and the negative electrode connection portion 122 on the negative electrode tab are located on the same side of the cell body 400 and are staggered. It is conceivable that the positive electrode connecting portion 121 connected to the positive electrode sheet is connected to the positive electrode post on the battery case and the negative electrode connecting portion 122 connected to the negative electrode sheet is connected to the negative electrode post on the battery case after winding. Two connecting portions 120 that stagger and set up can not interfere each other in space, also can not contact each other, greatly reduced the short circuit risk of electric core.

Referring to fig. 3, optionally, the multi-tab battery cell further includes a coating layer 410, and the coating layer 410 coats the peripheral wall surface and the welding end of the battery cell body 400. The electric core is used as a core component of current output, and must be insulated from the battery shell, and a coating layer 410 for insulation is coated outside the electric core, wherein the coating layer 410 can be a polymer protective film and plays a role in insulating the electric core and the battery shell.

The embodiment further provides a battery, which includes a battery case and the multi-tab battery cell disposed inside the battery case, and the connecting portion 120 is connected to the battery case. It is conceivable that the positive electrode connection part 121 is connected to a positive electrode post on the battery case, and the negative electrode connection part 122 is connected to a negative electrode post on the battery case

The battery provided by the embodiment of the utility model uses the multi-tab battery cell, the space utilization rate of the battery is improved, the welding area is not reduced, and the impedance of the battery is ensured not to be increased.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-tab cell comprises a diaphragm and two pole pieces, wherein the two pole pieces are separated by the diaphragm and wound to form a cell body (400); it is characterized in that the preparation method is characterized in that,

each pole piece comprises a welding pole lug (100), a substrate (200) and a plurality of connecting pole lugs (210), when the substrate (200) is unfolded, the welding pole lug (100) is fixed on the substrate (200) along a first direction, two ends of the welding pole lug (100) respectively extend out of the substrate (200) to form a welding part (110) and a connecting part (120), and the connecting part (120) is used for connecting a battery shell;

a plurality of connecting tabs (210) are arranged on one side edge of the substrate (200) at intervals along a second direction, after the substrate (200) is wound along the second direction to form the cell body (400), the plurality of connecting tabs (210) and the welding part (110) are welded to form a welding end of the cell body (400); the first direction is perpendicular to the second direction.

2. The multi-tab cell of claim 1, wherein the weld (110) is capable of overlapping a plurality of the connection tabs (210) after being wound to form the cell body (400).

3. The multi-tab cell of claim 2, wherein a dimension of the connection tab (210) in the second direction is not less than a dimension of the weld (110) in the second direction.

4. The multi-tab cell of claim 1, wherein the dimension of the weld (110) in the first direction is no greater than the dimension of the cell body (400) in a third direction, the first, second, and third directions being perpendicular in pairs.

5. The multi-tab cell of claim 4, wherein the connection tab (210) protrudes from the substrate (200) by no more than a dimension of the cell body (400) in the third direction.

6. The multi-tab cell of claim 1, wherein a tab film (130) is sleeved on the connecting portion (120).

7. The multi-tab cell of claim 1, wherein the connection portions (120) of the two pole pieces are located on the same side of the cell body (400) and are staggered.

8. The multi-tab cell of claim 1, further comprising a coating layer (410), wherein the coating layer (410) coats the cell body (400) peripheral wall surface and the weld end.

9. A battery comprising a battery housing and a multi-tab cell as claimed in any one of claims 1 to 8 disposed inside the battery housing, the connection portion (120) being connected to the battery housing.