CN220066033U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a battery, which comprises a battery core, wherein the battery core comprises a battery core main body and a lug part extending from the battery core main body, the lug part comprises a first single-chip lug layer and a second single-chip lug layer which are adjacently arranged, a concave is formed between the first single-chip lug layer and the second single-chip lug layer, the concave bottom wall comprises a curved surface, the distance between the first single-chip lug layer and the second single-chip lug layer is less than or equal to 5mm, namely the distance between the first single-chip lug layer and the second single-chip lug layer is relatively smaller, so that the overcurrent capacity of the lug part can be ensured, and the concave bottom wall comprises the curved surface, so that the risk of tearing during bending between the first single-chip lug layer and the second single-chip lug layer can be reduced, and the safe use performance of the battery can be improved.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

In the related art, the tab of the battery cell can be formed by a plurality of single-chip tab layers, in order to ensure the overcurrent capacity of the tab, the interval between adjacent single-chip tab layers is relatively close, and in the process of forming or using the battery cell, the risk of tearing between the adjacent single-chip tab layers can be possibly caused.

Disclosure of Invention

The utility model provides a battery, which is used for improving the service performance of the battery.

The utility model provides a battery, which comprises a battery core, wherein the battery core comprises a battery core main body and a lug part extending from the battery core main body, the lug part comprises a first single-chip lug layer and a second single-chip lug layer which are adjacently arranged, a dent is formed between the first single-chip lug layer and the second single-chip lug layer, the bottom wall of the dent comprises a curved surface, and the distance between the first single-chip lug layer and the second single-chip lug layer is less than or equal to 5mm.

The battery provided by the embodiment of the utility model comprises the battery core, wherein the battery core comprises the battery core main body and the electrode lug part, a dent is formed between the first single-sheet electrode lug layer and the second single-sheet electrode lug layer of the electrode lug part, the distance between the first single-sheet electrode lug layer and the second single-sheet electrode lug layer is less than or equal to 5mm, namely, the distance between the first single-sheet electrode lug layer and the second single-sheet electrode lug layer is relatively smaller, so that the overcurrent capacity of the electrode lug part can be ensured, the dent bottom wall comprises a curved surface, the risk of tearing when bending between the first single-sheet electrode lug layer and the second single-sheet electrode lug layer can be reduced, and the safe service performance of the battery can be improved.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view showing the structure of a battery cell of a battery according to an exemplary embodiment;

fig. 2 is an exploded view showing a partial structure of a battery cell of a battery according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a battery cell; 11. a cell body; 12. a tab portion; 121. a first monolithic tab layer; 122. a second monolithic tab layer; 123. a recess; 124. a curved surface; 125. an insulating adhesive layer.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Referring to fig. 1 and 2, an embodiment of the present utility model provides a battery, where the battery includes a battery cell 10, the battery cell 10 includes a battery cell main body 11 and a tab portion 12 extending from the battery cell main body 11, the tab portion 12 includes a first monolithic tab layer 121 and a second monolithic tab layer 122 disposed adjacently, a recess 123 is formed between the first monolithic tab layer 121 and the second monolithic tab layer 122, a bottom wall of the recess 123 includes a curved surface 124, and a distance between the first monolithic tab layer 121 and the second monolithic tab layer 122 is less than or equal to 5mm.

The battery of the embodiment of the utility model comprises a battery core 10, the battery core 10 comprises a battery core main body 11 and a tab part 12, a concave 123 is formed between a first single tab layer 121 and a second single tab layer 122 of the tab part 12, the distance between the first single tab layer 121 and the second single tab layer 122 is less than or equal to 5mm, namely, the distance between the first single tab layer 121 and the second single tab layer 122 is relatively smaller, so that the overcurrent capacity of the tab part 12 can be ensured, and the bottom wall of the concave 123 comprises a curved surface 124, the risk of tearing due to bending between the first single tab layer 121 and the second single tab layer 122 can be reduced, and the safe service performance of the battery can be improved.

It should be noted that, the battery cell 10 includes a battery cell main body 11 and a tab portion 12 extending from the battery cell main body 11, the tab portion 12 may be used for connection with an electrode lead-out structure, and the electrode lead-out structure may be a pole column assembly, or the electrode lead-out structure may be a current collector, or the electrode lead-out structure may be a battery case. The tab portion 12 may be a positive tab, or the tab portion 12 may be a negative tab. The tab portions 12 may be at least two, at least one may be a positive tab, and at least one may be a negative tab.

The tab 12 may include a plurality of single-chip tab layers, the plurality of single-chip tab layers may include a first single-chip tab layer 121 and a second single-chip tab layer 122, that is, along the winding direction of the battery core 10, the tab 12 includes a first single-chip tab layer 121 and a second single-chip tab layer 122 that are adjacently disposed, and the first single-chip tab layer 121 and the second single-chip tab layer 122 are disposed at intervals, so that a recess 123 may be formed between the first single-chip tab layer 121 and the second single-chip tab layer 122, thereby facilitating the formation of the subsequent tab 12, that is, after the battery core 10 is completed, each single-chip tab layer of the tab 12 may be folded, bent and formed, and the risk of wrinkling of the single-chip tab layer is reduced.

As shown in fig. 2, the tab 12 includes a first monolithic tab layer 121 and a second monolithic tab layer 122 that are disposed adjacently, that is, the first monolithic tab layer 121 and the second monolithic tab layer 122 extend from one pole piece of the battery core main body 11, for example, when the battery core 10 is a winding type battery core, the tab 12 includes the first monolithic tab layer 121 and the second monolithic tab layer 122 disposed adjacently along the winding direction of the battery core 10, or when the battery core 10 is a laminated type battery core, one end of the same pole piece extends from the first monolithic tab layer 121 and the second monolithic tab layer 122 disposed adjacently.

The winding direction of the winding type battery cell is substantially the spiral extending direction, for example, the winding type battery cell is wound on a cylindrical winding rod, and at this time, the winding extending direction of the winding type battery cell is the winding direction of the battery cell 10.

The distance between the first and second single tab layers 121 and 122 is less than or equal to 5mm, i.e., the distance between the first and second single tab layers 121 and 122 may be relatively small, so that the overcurrent capability of the tab 12 may be ensured.

And the distance between the first and second single tab layers 121 and 122 is relatively small, so that there is a risk of tearing between the first and second single tab layers 121 and 122, and stress concentration between the first and second single tab layers 121 and 122 can be reduced by making the bottom wall of the recess 123 include the curved surface 124, thereby reducing the risk of tearing between the first and second single tab layers 121 and 122.

In one embodiment, the curved surface 124 is an arc surface, which not only facilitates the formation of the first monolithic tab layer 121 and the second monolithic tab layer 122, but also reduces the risk of stress concentration formed by the first monolithic tab layer 121 and the second monolithic tab layer 122, thereby reducing the risk of tearing between the first monolithic tab layer 121 and the second monolithic tab layer 122.

A first and second single tab layers 121 and 122 may be formed on one of the pole pieces, for example, the pole pieces and the single tab layers are of a rectangular structure before the first and second single tab layers 121 and 122 are formed, and a recess 123 is formed between the first and second single tab layers 121 and 122 by cutting a U-shaped groove in the rectangular structure.

In one embodiment, the curvature of the curved surface 124 is 5 pi/6-7 pi/6, and on the basis of reducing the risk of stress concentration formed by the first monolithic tab layer 121 and the second monolithic tab layer 122, the recess 123 is prevented from being oversized, so that the overcurrent capability of the tab 12 can be ensured.

The curvature of the curved surface 124 may be 5 pi/6, 6 pi/7, pi or 7 pi/6, etc.

In one embodiment, the distance between the first monolithic tab layer 121 and the second monolithic tab layer 122 is greater than or equal to 0.1m, and the distance between the first monolithic tab layer 121 and the second monolithic tab layer 122 is less than or equal to 5mm, so that the distance between the first monolithic tab layer 121 and the second monolithic tab layer 122 is avoided from being too large on the basis that the recess 123 can be formed between the first monolithic tab layer 121 and the second monolithic tab layer 122, thereby being convenient for the first monolithic tab layer 121 and the second monolithic tab layer 122 to form the tab 12, and also being capable of ensuring the overcurrent capacity of the tab 12.

The distance between the first and second monolithic tab layers 121 and 122 may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.5mm, 4.8mm, or 5mm, etc.

In one embodiment, the thicknesses of the first monolithic tab layer 121 and the second monolithic tab layer 122 are 4 μm-15 μm, so that the strength of the first monolithic tab layer 121 and the second monolithic tab layer 122 is enhanced on the basis of ensuring that the first monolithic tab layer 121 and the second monolithic tab layer 122 can have a certain thickness, the risk of tearing between the first monolithic tab layer 121 and the second monolithic tab layer 122 is avoided, and the problem that the overall energy density of the battery is too low due to the excessively thick thickness of the first monolithic tab layer 121 and the second monolithic tab layer 122 can be avoided.

The thickness of the first monolithic tab layer 121 may be 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, or 15 μm, etc.

The thickness of the second monolithic tab layer 122 may be 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, or 15 μm, etc.

In one embodiment, as shown in fig. 2, the insulating adhesive layer 125 is disposed on the first monolithic tab layer 121 and the second monolithic tab layer 122, so that the insulating adhesive layer 125 can form insulating protection for the first monolithic tab layer 121 and the second monolithic tab layer 122, reducing the risk of short circuit of the tab 12, and the insulating adhesive layer 125 can also form protection for the first monolithic tab layer 121 and the second monolithic tab layer 122, for example, the insulating adhesive layer 125 can also reduce the risk of corrosion of the first monolithic tab layer 121 and the second monolithic tab layer 122 by the electrolyte.

The insulating adhesive layer 125 may be a tab tape, for example, the insulating adhesive layer 125 may be a polyimide tape.

In one embodiment, in the direction in which the first monolithic tab layer 121 extends from the cell main body 11, the insulating adhesive layer 125 covers the first monolithic tab layer 121 and the second monolithic tab layer 122, and the lengths of the first monolithic tab layer 121 and the second monolithic tab layer 122 are smaller than those of the first monolithic tab layer 121 and the second monolithic tab layer 122, so that the insulating adhesive layer 125 can be prevented from affecting the connection between the tab 12 and the electrode lead-out structure, for example, the tab 12 is welded to the electrode lead-out structure, and the insulating adhesive layer 125 covers part of the first monolithic tab layer 121 and the second monolithic tab layer 122, so that the tab 12 and the electrode lead-out structure can be reliably welded.

The insulating adhesive layer 125 may be connected to the electric core main body 11, the insulating adhesive layer 125 extends from the electric core main body 11 to the first single-chip tab layer 121 and the second single-chip tab layer 122, and the length of the insulating adhesive layer 125 covering the first single-chip tab layer 121 and the second single-chip tab layer 122 is smaller than the length of the first single-chip tab layer 121 and the second single-chip tab layer 122 not covered by the insulating adhesive layer 125 along the direction in which the first single-chip tab layer 121 extends from the electric core main body 11.

In one embodiment, the tab portion 12 is a positive electrode tab portion, and the insulating adhesive layer 125 may cover the positive electrode tab portion, so as to form an effective insulation protection for the positive electrode tab portion, and avoid the risk of short circuit between the positive electrode tab portion and other structures, thereby improving the safe service performance of the battery.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In one embodiment, the battery may be a quadrangular prism type battery, and the quadrangular prism type battery mainly refers to a prism shape, but whether each side of the prism is a straight line in a strict sense is not strictly limited, and corners between sides are not necessarily right angles, and may be arc transition.

The battery can be a laminated battery, so that the battery is not only convenient to group, but also long in length. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In one embodiment, the cell 10 is a cylindrical jellyroll.

As shown in connection with fig. 1, the cylindrical winding core may include two tab portions 12, one of the two tab portions 12 may be a positive tab and the other may be a negative tab.

The battery may be a cylindrical battery, or the battery may be a hexagonal-prism-type battery. The battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

An embodiment of the present utility model also provides a battery pack including the above battery.

The battery pack according to one embodiment of the utility model comprises a battery, wherein the battery comprises a battery core 10, the battery core 10 comprises a battery core main body 11 and a tab part 12, a concave 123 is formed between a first single tab layer 121 and a second single tab layer 122 of the tab part 12, the distance between the first single tab layer 121 and the second single tab layer 122 is less than or equal to 5mm, namely, the distance between the first single tab layer 121 and the second single tab layer 122 is relatively smaller, so that the overcurrent capacity of the tab part 12 can be ensured, and the bottom wall of the concave 123 comprises a curved surface 124, so that the risk of tearing due to bending between the first single tab layer 121 and the second single tab layer 122 can be reduced, and the safety use performance of the battery pack can be improved.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery may be a cylindrical battery, the battery module may further include a bracket, and the battery may be fixed to the bracket.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

It should be noted that the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The utility model provides a battery, its characterized in that, includes electric core (10), electric core (10) include electric core main part (11) and by extend on electric core main part (11) and utmost point ear (12) that go out, utmost point ear (12) are including adjacent first monolithic utmost point ear layer (121) and the second monolithic utmost point ear layer (122) that set up, first monolithic utmost point ear layer (121) with be formed with between second monolithic utmost point ear layer (122) sunken (123), the diapire of sunken (123) includes curved surface (124), distance between first monolithic utmost point ear layer (121) with between second monolithic utmost point ear layer (122) is no more than 5mm.

2. The battery according to claim 1, wherein the curved surface (124) is an arc surface.

3. The battery of claim 2, wherein the curved surface (124) has an arc of 5 pi/6-7 pi/6.

4. The battery according to claim 1, wherein a distance between the first monolithic tab layer (121) and the second monolithic tab layer (122) is equal to or greater than 0.1m.

5. The battery according to claim 1, wherein the thickness of the first and second monolithic tab layers (121, 122) is 4-15 μιη.

6. The battery according to any one of claims 1 to 5, characterized in that an insulating glue layer (125) is provided on the first and second monolithic tab layers (121, 122).

7. The battery according to claim 6, wherein the length of the insulating adhesive layer (125) covering the first and second single tab layers (121, 122) is smaller than the length of the first and second single tab layers (121, 122) in the direction in which the first single tab layer (121) extends from the cell main body (11).

8. The battery according to claim 6, wherein the tab portion (12) is a positive tab portion.

9. The battery according to any one of claims 1 to 5, characterized in that the cell (10) is a cylindrical jellyroll.

10. The battery of claim 9, wherein the battery is a cylindrical battery.