CN218957983U

CN218957983U - Battery cell

Info

Publication number: CN218957983U
Application number: CN202223358899.3U
Authority: CN
Inventors: 齐彬伟; 王珂
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-05-02
Anticipated expiration: 2032-12-14

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: a battery case; the battery cell is arranged in the battery shell and comprises a battery cell main body and a tab extending from the battery cell main body, and the battery cell main body comprises an external protection film; the insulating film is fixedly connected to the outer surface of the electrode lug so as to avoid the electrode lug from being electrically connected with the battery shell; the insulating film is at least partially arranged between the external protective film and the lug, so that the insulating film can be guaranteed to realize reliable insulating protection on the lug, short circuit between the lug and the battery shell is avoided, the lug can be converged through the insulating film, the converging capacity of the lug is improved, the integral infiltration of electrolyte is not hindered, and the service performance of the battery is 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 core can be formed by folding, and is electrically connected with the pole post assembly after the tab is folded, however, due to the structural limitation of the tab, the tab can easily deform and the like, so that the risk of overlapping the tab and the battery shell can occur.

Disclosure of Invention

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

The present utility model provides a battery comprising:

a battery case;

the battery cell is arranged in the battery shell and comprises a battery cell main body and a tab extending from the battery cell main body, and the battery cell main body comprises an external protection film;

the insulating film is fixedly connected to the outer surface of the electrode lug so as to avoid the electrode lug from being electrically connected with the battery shell;

wherein, the insulating film is at least partially arranged between the external protection film and the tab.

The battery provided by the embodiment of the utility model comprises a battery shell, a battery core and an insulating film, wherein the battery core is arranged in the battery shell, and the insulating film is fixedly connected to the outer surface of the tab, so that the tab and the battery shell can be prevented from being electrically connected. Through making the insulating film at least partly set up between outside protection film and utmost point ear, not only can guarantee that the insulating film realizes the reliable insulation protection to the utmost point ear, avoid utmost point ear and battery case to appear the short circuit to can receive the beam to the utmost point ear through the insulating film, improve the beam-receiving ability of utmost point ear, also can not hinder the whole infiltration of electrolyte, and then improve the performance of battery.

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 a structure of a battery according to an exemplary embodiment;

fig. 2 is a partially exploded structural view of a battery according to a first exemplary embodiment;

fig. 3 is a partial schematic structure of a battery according to a second exemplary embodiment;

fig. 4 is a partial schematic structure of a battery according to a third exemplary embodiment;

fig. 5 is a partial schematic structure of a battery according to a fourth exemplary embodiment.

The reference numerals are explained as follows:

10. a battery case; 11. a liquid injection hole; 12. a cover plate assembly; 13. a housing member; 20. a battery cell; 21. a cell body; 211. an external protective film; 22. a tab; 30. an insulating film; 31. a first portion; 32. a second portion; 40. a pole assembly; 50. and a switching piece.

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 "on," "under," or "in" or "out" of another element or feature being "on," "under" or "in" or "out" of the other element or elements, it can be directly connected to the other element or elements, or indirectly connected to the other element or elements via intervening elements.

An embodiment of the present utility model provides a battery, please refer to fig. 1 to 3, including: a battery case 10; the battery cell 20, the battery cell 20 is set up in the battery case 10, the battery cell 20 includes the body 21 of the battery cell and electrode lug 22 that extends from body 21 of the battery cell, the body 21 of the battery cell includes the external protection film 211; an insulating film 30, the insulating film 30 being fixedly connected to the outer surface of the tab 22 to prevent the tab 22 from being electrically connected to the battery case 10; wherein, the insulating film 30 is at least partially disposed between the external protective film 211 and the tab 22.

The battery according to an embodiment of the utility model includes a battery case 10, a battery cell 20, and an insulating film 30, wherein the battery cell 20 is disposed in the battery case 10, and the insulating film 30 is fixedly connected to the outer surface of the tab 22, so that the tab 22 is prevented from being electrically connected to the battery case 10. Through making insulating film 30 set up at least partially between external protection film 211 and utmost point ear 22, not only can guarantee that insulating film 30 realizes the reliable insulation protection to utmost point ear 22, avoid utmost point ear 22 and battery case 10 to appear the short circuit to can receive the beam to utmost point ear 22 through insulating film 30, improve the beam-receiving ability of utmost point ear 22, also can not hinder the whole infiltration of electrolyte, and then improve the performance of battery.

It should be noted that, referring to fig. 2 and 3, the battery cell 20 includes a battery cell main body 21 and a tab 22 extending from the battery cell main body 21, and at least a portion of the insulating film 30 needs to be fixedly connected to the tab 22, so as to realize insulation protection of the tab 22 and the battery case 10, and avoid a short circuit risk between the tab 22 and the battery case 10.

The external protective film 211 is a cell insulating film, and for example, the cell main body 21 may be wound or wrapped around the stacked portion, and the cell insulating film is the external protective film 211 that is wrapped around the outermost portion of the stacked portion.

As shown in fig. 2, the cell main body 21 may include a main body portion formed of a stacked portion and an external protection film 211, and the external protection film 211 may be coated on the main body portion formed of the stacked portion, thereby increasing the insulating ability of the cell 20.

And the insulating film 30 is at least partially disposed between the external protective film 211 and the tab 22, i.e., the insulating film 30 may be disposed on the body portion formed by the stacked portion, or the insulating film 30 may be disposed on the tab 22, at which time, a portion of the external protective film 211 may protrude toward the lead-out direction of the tab 22, so that the external protective film 211 may be disposed beyond the body portion.

If the outer surface of the tab 22 is unconstrained, there is a risk that the outer surface of the tab 22 is folded inwards and the insulation failure exceeding the overlap joint of the external protection film and the battery case 10 occurs, the tab 22 is folded through the insulation film 30, the thickness of the external protection film is larger and is not easy to bend, and if the coating area of the external protection film is too large, the whole infiltration of the electrolyte is affected, so that the above problem caused when the tab 22 is protected through the external protection film can be avoided by arranging the insulation film 30 on the basis of ensuring the insulation protection of the tab 22 in the embodiment.

In one embodiment, the insulating film 30 may include a portion located on the cell main body 21 and a portion not located on the cell main body 21, but it is necessary to ensure that the portion of the insulating film 30 located on the cell main body 21 is not more than 3 times the portion of the insulating film 30 not located on the cell main body 21, so that the problem of the overall size of the insulating film 30 being excessively large can be avoided, thereby reducing the increased battery weight of the insulating film 30, and also the insulating film 30 occupying too much of the internal space of the battery case 10 can be avoided, thereby improving the energy density of the battery.

A part of the insulating film 30 may be located on the cell main body 21, or all of the insulating film 30 may not be located on the cell main body 21. The insulating film 30 at least ensures the covering of the tab 22, thereby realizing the insulating protection between the tab 22 and the battery case 10.

In one embodiment, as shown in fig. 2 to 5, the portion of the insulating film 30 on the cell main body 21 is smaller than the portion of the insulating film 30 not on the cell main body 21, so that the problem of oversized insulating film 30 can be avoided, thereby reducing the amount of insulating film 30.

In one embodiment, none of the insulating films 30 is connected to the cell main body 21, so that none of the insulating films 30 is located on the cell main body 21, i.e., the insulating films 30 can be relatively small in size on the basis of ensuring insulation protection of the tabs 22, thereby ensuring energy density of the battery.

The insulating films 30 may each be used to cover the tab 22, although it is not excluded that a portion of the insulating film 30 is used to cover the tab 22, but that a portion of the insulating film 30 beyond the tab 22 may be used to cover other structures, which are not limited thereto.

In one embodiment, as shown in fig. 2, the insulating film 30 includes a first portion 31 and a second portion 32 that are connected, where the first portion 31 is connected to the cell main body 21, and the second portion 32 is fixedly connected to the outer surface of the tab 22, so that the insulating film 30 can be reliably fixed on the cell 20 through the first portion 31 and the second portion 32, the connection stability of the insulating film 30 is improved, and the problem of insulation failure caused by the falling of the insulating film 30 is avoided.

The first portion 31 is connected to the cell main body 21, so that not only can the connection stability of the insulating film 30 be ensured, but also the insulating protection of the first portion 31 to the cell main body 21 can be ensured. And the second portion 32 is fixedly coupled to the outer surface of the tab 22, thereby allowing the second portion 32 to achieve insulation protection between the tab 22 and the battery case 10.

The first portion 31 is not greater than 3 times the second portion 32, further, the first portion 31 is not greater than 2 times the second portion 32, and the first portion 31 may be equal to the second portion 32.

In one embodiment, the external protective film 211 covers at least the first portion 31, i.e., the first portion 31 may be attached to the main body portion formed by the stack, and the external protective film 211 covers the first portion 31, or the first portion 31 may be attached to the inside of the external protective film 211.

In one embodiment, the first portion 31 is smaller than the second portion 32, so that the first portion 31 is not excessively large on the basis that the first portion 31 can be fixed by the cell main body 21, and the problem of increasing the weight of the battery due to excessively large insulating film 30 can be avoided on the basis that the insulating film 30 is reliably insulated.

In one embodiment, the width of the insulating film 30 is greater than the width of the tab 22 in the direction perpendicular to the lead-out direction of the tab 22, so that the insulating film 30 can reliably cover the portion of the tab 22 in the width direction, thereby ensuring the insulating capability of the tab 22, and the insulating film 30 can also achieve reliable binding fixation of the tab 22, improving the safe use performance of the battery.

The lead-out direction of the tab 22 can be regarded as the extending direction of the tab 22 after the tab 22 is straightened.

In one embodiment, the cell main body 21 includes an external protection film, and the external protection film forms an external surface of the cell main body 21, so that the external protection film forms an insulating protection layer of the cell main body 21, thereby ensuring insulating capability of the cell main body 21 and improving safe use performance of the cell 20.

The thickness of the insulating film 30 is smaller than that of the external protective film, and on the basis of ensuring that the insulating film 30 can realize insulation protection, the bending capability of the insulating film 30 can be higher than that of the external protective film, so that the insulating film 30 can conveniently form insulation protection on the tab 22.

In one embodiment, the external protection film 211 forms at least four external surfaces of the cell main body 21, so that the external protection film 211 can improve the insulation capability of the cell 20, and the external protection film 211 can also realize the beam-closing protection of the main body formed by the stacking part to some extent, so as to avoid the loosening problem of the stacking part.

The external protection film 211 is a protection film outside the stack portion, so as to improve the insulating capability of the battery cell 20, for example, the outermost side of the stack portion may be a diaphragm, and the outer side of the diaphragm may be further provided with the external protection film 211.

In one embodiment, the insulating film 30 is adhered to the tab 22, so that not only can reliable insulation protection of the tab 22 by the insulating film 30 be ensured, but also the performance of the insulating film 30 can be improved.

In one embodiment, as shown in fig. 1, the battery case 10 is provided with a liquid injection hole 11, and the orthographic projection of the insulating film 30 towards the plane of the liquid injection hole 11 is at least partially not overlapped with the liquid injection hole 11, where the insulating film 30 is disposed on the side of the tab 22 facing the liquid injection hole 11, so that the problem that when the electrolyte is injected through the liquid injection hole 11, the electrolyte directly impacts the insulating film 30 to cause the insulating film 30 to fall off, or in some cases, the problem that the insulating film 30 is erroneously separated to block the liquid injection hole 11 can be avoided.

In one embodiment, as shown in fig. 1, the battery further includes a pole assembly 40, where the pole assembly 40 is disposed on the battery housing 10, and the pole assembly 40 is electrically connected with the tab 22, so that the pole assembly 40 can be used as a charging and discharging end of the battery, so as to facilitate connection when the subsequent batteries are grouped.

In one embodiment, the insulating film 30 is disposed on the side of the tab 22 facing the pole assembly 40, where the insulating film 30 can implement the beam-shrinking protection of the tab 22, and can also avoid the risk of shorting between the tab 22 and the battery case 10, thereby improving the safe service performance of the battery.

The tab 22 may be formed of at least two single-piece tabs, and the insulating film 30 may be used to achieve the bundling of the single-piece tabs, never to improve the bundling capability of the single-piece tabs.

In one embodiment, the tab 22 may be directly connected with the post assembly 40, i.e., the tab may be removed, thereby reducing the number of components used in the battery, not only improving the assembly efficiency of the battery, but also improving the energy density of the battery.

The tab 22 may be directly welded to the post assembly 40.

In one embodiment, as shown in fig. 4, the battery further includes a switching piece 50, and the pole assembly 40 is electrically connected with the tab 22 through the switching piece 50, so that the setting position of the tab 22 can be more flexible, and the setting of the pole assembly 40 is convenient, thereby facilitating the use of the battery.

The post assembly 40 may be welded to the tab 50 and the tab 50 may be welded to the tab 22.

In one embodiment, the insulating film 30 is located between the tab 50 and the tab 22, so that the insulating film 30 can also be prevented from affecting the connection between the post assembly 40 and the tab 50 on the basis that the insulating film 30 achieves effective insulation protection of the tab 22.

In one embodiment, as shown in fig. 4, the tab 50 is located between the insulating film 30 and the tab 22, so that the insulating film 30 can also realize insulation protection for the tab 50.

In one embodiment, the battery cells 20 are one, i.e., only one battery cell 20 may be disposed within one battery case 10.

The battery may include two pole assemblies 40, the battery cell 20 may include two tabs 22, and the two tabs 22 may be electrically connected to the two pole assemblies 40, respectively.

In one embodiment, at least two battery cells 20 may be provided in one battery case 10, thereby increasing the capacity of the battery.

For example, as shown in connection with fig. 4 and 5, the battery may include two cells 20, the tabs 22 of the two cells 20 may be used for the post assembly 40, for example, each cell 20 may include two tabs 22, the opposing two tabs 22 of the two cells 20 may share one post assembly 40, and the post assembly 40 may be two.

In one embodiment, as shown in fig. 4 and 5, the tabs 22 of each cell 20 are respectively covered with an independent insulating film 30, so that the independent insulating films 30 can respectively cover different tabs 22, not only is the installation mode simple, but also each insulating film 30 can be ensured to reliably cover the tab 22, thereby ensuring the insulating performance.

It should be noted that, in some embodiments, it is not excluded that one insulating film 30 may cover the tabs 22 of two cells 20 at the same time.

In one embodiment, the insulating film 30 is disposed on the side of the tab 22 near the battery case 10, so that it is possible to ensure that the insulating film 30 achieves reliable insulation protection of the tab 22 and the battery case 10, and to allow the insulating film 30 to be used for the bundling of the tab 22, improving the formation efficiency of the tab 22.

In one embodiment, as shown in fig. 1, the battery case 10 includes a cover assembly 12 and a case member 13, and the cover assembly 12 is connected to the case member 13, thereby sealing the battery cells 20. The cover assembly 12 and the housing part 13 can be welded together.

The leading-out direction of the tab 22 is perpendicular to the cover plate assembly 12, so that the tab 22 is in an ejection structure, the tab 22 and the pole post assembly 40 are conveniently electrically connected, and subsequent battery grouping can be conveniently performed.

Alternatively, the lead-out direction of the tabs 22 may be parallel to the cover assembly 12, for example, two tabs 22 on the cell body 21 may extend from opposite ends of the cell body 21, respectively.

The post assembly 40 is disposed on the cover assembly 12, and the cover assembly 12 may include a cover and an insulating structure, etc., without limitation.

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 is a unit formed by winding or laminating a stacked portion including a positive electrode tab, a separator, and a negative electrode tab. When the positive pole piece is the positive pole piece, the negative pole piece is the negative pole piece. Wherein, the polarity of the positive pole piece and the negative pole piece can be interchanged. The positive electrode sheet and the negative electrode sheet are coated with an active material.

In one embodiment, the battery may be a square battery, that is, the battery may be a quadrangular battery, where the quadrangular battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions.

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 positive pole piece, a negative pole piece opposite to the positive pole piece in electrical property and a diaphragm sheet arranged between the positive pole piece and the negative pole piece, so that a plurality of pairs of positive pole pieces and negative pole pieces are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery, that is, the battery cell 20 is a wound battery cell, where the positive electrode sheet, the negative electrode sheet opposite to the positive electrode sheet, and the separator sheet disposed between the positive electrode sheet and the negative electrode sheet are wound to obtain the wound battery cell.

In one embodiment, the battery may be a cylindrical battery. The battery can be a winding type battery, namely, a positive electrode plate, a negative electrode plate opposite to the positive electrode plate in electrical property and a diaphragm arranged between the positive electrode plate and the negative electrode plate are wound to obtain a winding type battery cell.

Note that, in fig. 1 to 5, only fig. 2 shows that the cell main body 21 includes the external protection film 211, and in other views, the position of the insulating film 30 is represented for convenience, and thus, the external protection film 211 is not shown.

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

The battery pack according to an embodiment of the present utility model includes a battery, the battery includes a battery case 10, a battery cell 20, and an insulating film 30, the battery cell 20 is disposed in the battery case 10, and the insulating film 30 is fixedly connected to an outer surface of the tab 22, so that the tab 22 can be prevented from being electrically connected to the battery case 10. Through making insulating film 30 set up at least partially between external protection film 211 and utmost point ear 22, not only can guarantee that insulating film 30 realizes the reliable insulation protection to utmost point ear 22, avoid utmost point ear 22 and battery case 10 to appear the short circuit to can receive the beam to utmost point ear 22 through insulating film 30, improve the beam-receiving ability of utmost point ear 22, also can not hinder the whole infiltration of electrolyte, and then improve the performance of battery.

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

1. A battery, comprising:

a battery case (10);

the battery cell (20), the battery cell (20) is arranged in the battery shell (10), the battery cell (20) comprises a battery cell main body (21) and a tab (22) extending from the battery cell main body (21), and the battery cell main body (21) comprises an external protection film (211);

an insulating film (30), wherein the insulating film (30) is fixedly connected to the outer surface of the tab (22) so as to prevent the tab (22) from being electrically connected with the battery case (10);

wherein the insulating film (30) is at least partially disposed between the external protection film (211) and the tab (22).

2. The battery according to claim 1, characterized in that the insulating film (30) comprises a first portion (31) and a second portion (32) connected, the first portion (31) being connected to the cell body (21), the second portion (32) being fixedly connected to the outer surface of the tab (22);

wherein the outer protective film (211) covers at least the first portion (31).

3. The battery according to claim 2, characterized in that the first portion (31) is smaller than the second portion (32).

4. The battery according to claim 1, wherein the width of the insulating film (30) is larger than the width of the tab (22) in a direction perpendicular to the lead-out direction of the tab (22).

5. The battery according to any one of claims 1 to 4, wherein the external protection film (211) forms at least part of an outer surface of the cell main body (21), and the thickness of the insulating film (30) is smaller than the thickness of the external protection film (211).

6. The battery according to claim 5, wherein the external protective film (211) forms at least four external surfaces of the cell main body (21).

7. The battery according to any one of claims 1 to 4, characterized in that the insulating film (30) is bonded to the tab (22).

8. The battery according to any one of claims 1 to 4, characterized in that a liquid injection hole (11) is provided on the battery case (10), and an orthographic projection of the insulating film (30) toward a plane in which the liquid injection hole (11) is located is at least partially not coincident with the liquid injection hole (11);

the insulating film (30) is arranged on one side of the lug (22) facing the liquid injection hole (11).

9. The battery according to any one of claims 1 to 4, further comprising a post assembly (40), the post assembly (40) being disposed on the battery housing (10), the post assembly (40) being electrically connected with the tab (22);

wherein, the insulating film (30) is arranged on one side of the lug (22) facing the pole assembly (40).

10. The battery according to claim 9, further comprising a tab (50), the post assembly (40) being electrically connected to the tab (22) through the tab (50);

wherein, the insulating film (30) is located between the switching piece (50) and the tab (22), or the switching piece (50) is located between the insulating film (30) and the tab (22).

11. The battery according to any one of claims 1 to 4, wherein the cells (20) are at least two;

wherein, each lug (22) of each electric core (20) is respectively covered with an independent insulating film (30).

12. The battery according to any one of claims 1 to 4, characterized in that the insulating film (30) is provided on a side of the tab (22) close to the battery case (10).

13. The battery according to any one of claims 1 to 4, wherein the battery case (10) includes a cap assembly (12) and a case member (13), the cap assembly (12) is connected to the case member (13), and the lead-out direction of the tab (22) is perpendicular to the cap assembly (12), or the lead-out direction of the tab (22) is parallel to the cap assembly (12).

14. The battery according to any one of claims 1 to 4, wherein the battery is a quadrangular-type battery.