CN219739209U

CN219739209U - Battery and battery pack

Info

Publication number: CN219739209U
Application number: CN202321016726.5U
Authority: CN
Inventors: 沈玉阳; 马俊杰
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-09-22
Anticipated expiration: 2033-04-28

Abstract

The utility model relates to the technical field of batteries and provides a battery and a battery pack, wherein the battery comprises a battery shell, a battery core and an explosion-proof valve, and the battery shell is provided with a containing cavity and a liquid injection hole communicated with the containing cavity; the battery cell is positioned in the accommodating cavity; the explosion-proof valve is arranged on the battery shell, and the explosion-proof valve and the liquid injection hole are positioned on different sides of the battery shell; the distance between the explosion-proof valve and the liquid injection hole in the first direction is 40-120 mm, the first direction is perpendicular to the side face where the explosion-proof valve is located, and the tightness ratio between the battery shell and the battery core is as follows: 80% -95%. The battery can reduce the deformation of the explosion-proof valve during liquid injection through the liquid injection hole.

Description

Battery and battery pack

Technical Field

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

Background

In the related art, a battery generally includes an explosion-proof valve and a liquid injection hole through which an electrolyte can be injected into the battery. When electrolyte is injected into the injection hole through the injection device in the related art, negative pressure is required to be absorbed into the battery, and the injection device is required to apply pressure to the injection hole so as to realize the density of the injection hole. However, the actions of "negative suction" and "applying pressure to the filling hole" described above may cause the explosion-proof valve to deform or even fail.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The utility model provides a battery which can solve the technical problem that an explosion-proof valve is easy to deform.

The battery includes:

the battery shell is provided with a containing cavity and a liquid injection hole communicated with the containing cavity;

the battery cell is positioned in the accommodating cavity;

the explosion-proof valve is arranged on the battery shell, and the explosion-proof valve and the liquid injection hole are positioned on different sides of the battery shell;

the distance between the explosion-proof valve and the liquid injection hole in the first direction is 40-120 mm, the first direction is perpendicular to the side face where the explosion-proof valve is located, and the tightness ratio between the battery shell and the battery core is as follows: 80% -95%.

On the one hand, the battery that this disclosure provided will annotate liquid hole and explosion-proof valve and set up in the different sides of battery case, annotate liquid equipment when exerting pressure to annotating liquid hole, this pressure is less to the influence of explosion-proof valve to can reduce the deformation of explosion-proof valve. On the other hand, the battery provided by the disclosure is provided with the preset distance between the explosion-proof valve and the liquid injection hole, so that the influence of the pressure born by the liquid injection hole on the explosion-proof valve can be further reduced. On the other hand, if the tightness between the battery shell and the battery core is larger, the battery core inside the battery shell is more compact, the force applied to the liquid injection hole is easily transmitted to the explosion-proof valve, and the tightness between the battery shell and the battery core is set to be a preset numerical range, so that the battery can be ensured to have certain energy density, and the influence of the pressure applied to the liquid injection hole on the explosion-proof valve can be further reduced.

The utility model also provides a battery pack which can comprise the battery, and the battery pack has better safety performance.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

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 of the structure of an exemplary embodiment of a battery of the present disclosure;

fig. 2 is a schematic structural view of another exemplary embodiment of a battery of the present disclosure.

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.

The present exemplary embodiment first provides a battery, as shown in fig. 1, which is a schematic structural diagram of an exemplary embodiment of a battery of the present disclosure. The battery may include: a battery shell 1, an electric core (not shown) and an explosion-proof valve 2, wherein the battery shell 1 is provided with a containing cavity 11 and a liquid injection hole 12 communicated with the containing cavity 11; the battery cell is positioned in the accommodating cavity 11; the explosion-proof valve 2 is arranged on the battery shell 1, and the explosion-proof valve 2 and the liquid injection hole 12 are positioned on different sides of the battery shell 1; the distance S between the explosion-proof valve 2 and the liquid injection hole 12 in the first direction Y is 40-120 mm, the first direction Y is perpendicular to the side face where the explosion-proof valve 2 is located, and the tightness ratio between the battery shell 1 and the battery core is as follows: 80% -95%.

In the present exemplary embodiment, the distance between the explosion-proof valve 2 and the injection hole 12 in the first direction Y is understood to be the distance between the portion of the explosion-proof valve 2 farthest from the injection hole 12 in the first direction Y and the portion of the explosion-proof valve 2 farthest from the injection hole 12 in the first direction Y. In this exemplary embodiment, the battery is cut along a tangential plane parallel to the stacking direction of the pole pieces in the battery cell, and the ratio of the cross section of the battery cell to the cross section of the battery case is the tightness ratio between the battery case 1 and the battery cell. For example, when the battery cell is a winding type battery cell, the above-mentioned tangential plane is a tangential plane perpendicular to the axial direction of the winding type battery cell, and the present exemplary embodiment can adjust the elastic ratio of the battery by adjusting the winding number of the battery cell; when the battery cell is a laminated battery cell, the tangent plane is a tangent plane perpendicular to the pole piece, and the tightness ratio of the battery can be adjusted by adjusting the number of layers of the pole piece in the battery cell.

In the present exemplary embodiment, the distance S between the explosion-proof valve 2 and the pouring orifice 12 in the first direction Y may be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, or the like. The tightness ratio between the battery housing 1 and the battery cells may be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, etc.

In the present exemplary embodiment, as shown in fig. 1, the battery case 1 may include: a main housing 13 and a cover plate assembly 14, wherein an opening is formed on the main housing 13; a cover plate assembly 14 is covered on the opening, and the liquid injection hole 12 is formed on the cover plate assembly 14. The battery cell may be mounted into the accommodating chamber 11 through the opening formed in the main housing 13, and after the battery cell mounting is completed in this exemplary embodiment, the cap plate assembly 14 may be fixed to the main housing 13, and then the electrolyte may be injected into the accommodating chamber 11 through the electrolyte injection hole 12 in the main housing 13. In the present exemplary embodiment, the cover plate assembly 14 has a plate-shaped structure, and the liquid injection hole 12 is disposed on the cover plate assembly 14 to facilitate the manufacture of the liquid injection hole 12.

It should be appreciated that in other exemplary embodiments, the fill port 12 may also be located on the main housing 13.

In the present exemplary embodiment, as shown in fig. 1, the explosion-proof valve 2 and the liquid filling hole 12 are located at opposite sides of the battery case 1. The force generated by the liquid injection equipment to the liquid injection hole 12 is mainly transferred to the side surface connected with the side surface where the liquid injection hole 12 is located, and the explosion-proof valve 2 is less affected by the stress of the liquid injection hole 12 through the buffer of the side surface between the side surface where the liquid injection hole 12 is located and the side surface where the explosion-proof valve 2 is located, so that the deformation of the explosion-proof valve 2 can be further reduced.

In this exemplary embodiment, as shown in fig. 1, the side surface of the explosion-proof valve 2 and the side surface of the liquid injection hole 12 may be parallel. It should be appreciated that in other exemplary embodiments, the side of the explosion-proof valve 2 and the side of the injection hole 12 may also form a smaller angle, for example, the side of the explosion-proof valve 2 and the side of the injection hole 12 may form an angle of less than 30 degrees.

In the present exemplary embodiment, as shown in fig. 1, a center line X1 of the liquid injection hole 12 is offset from a center line X2 of the explosion-proof valve 2. This arrangement can avoid the liquid filling hole 12 and the explosion-proof valve 2 from being opposite to each other, and thus can avoid the electrolyte entering the accommodating cavity 11 through the liquid filling hole 12 from impacting the explosion-proof valve 2.

In this exemplary embodiment, as shown in fig. 1, the distance between the center line of the liquid injection hole 12 and the center line of the explosion-proof valve 2 is L1, and the geometric radius of the opening of the liquid injection hole 12 on the side facing the accommodating chamber 11 is r, where r/L1 may be 1/20 or more and 1/2 or less, for example, r/L1 may be 1/20, 1/19, 1/18, 1/17, 1/16, 1/15, 1/14, 1/13, 1/12, 1/11, 1/10, 1/9, 1/8, 1/7, 1/6, 1/5, 1/4, 1/3, 1/2, etc. The geometric radius r of the opening of the filling opening 12 on the side facing the receiving space 11 is understood to be the radius of the inscribed circle of this opening. When the opening is circular, the geometric radius of the opening is the radius of the opening itself.

The center line X1 of the injection hole 12 may be understood as a line passing through the centroid of the cross section of the injection hole 12 and parallel to the extending direction of the injection hole 12, and the cross section of the injection hole 12 is perpendicular to the extending direction of the injection hole 12. The center line X2 of the explosion-proof valve 2 can be understood as a line passing through the centroid of the explosion-proof valve and perpendicular to the side of the explosion-proof valve.

In the present exemplary embodiment, the explosion-proof valve 2 may be integrally structured with the battery case 1, for example, the explosion-proof valve 2 may be formed by punching the battery case 1. In the present exemplary embodiment, the explosion-proof valve 2 may be formed by a score on the battery case 1. The score on the battery case 1 may be located at the outside of the battery case. The score may be a closed pattern, e.g., the score may be a circle, rectangle, triangle, irregular pattern, etc. The score may also be in a non-closed pattern, for example, the score may be in a "cross," T, "X," etc. The explosion-proof valve can also be a thinning area formed by stamping, and the explosion-proof valve can also be a thinning area of the battery shell.

It should be appreciated that in other exemplary embodiments, the explosion-proof valve 2 may also be of non-integral construction with the battery housing 1, for example, the explosion-proof valve 2 may be a patch attached to the explosion-proof opening of the battery housing.

When the explosion-proof valve is formed by the score, and the score forms a closed figure, the centroid of the explosion-proof valve 2 is the centroid of the closed figure. When the score is in a non-closed pattern, the centroid of the blast valve 2 may be the intersection of the scores, and when the score has no intersection, the centroid of the blast valve 2 may be the midpoint of the score. When the explosion-proof valve is a thinning area or a patch, the centroid of the explosion-proof valve is the centroid of the thinning area or the patch.

In the present exemplary embodiment, as shown in fig. 1, the explosion-proof valve 2 may be located at the bottom surface of the battery case 1. When the battery pack is formed by the batteries, the bottom surface of the battery shell is a side surface of the battery shell supported by a bottom plate in the battery pack, and the top surface of the battery shell is an opposite side surface of the bottom surface of the battery shell. The arrangement can reduce damage to surrounding people and objects when the explosion-proof valve 2 is exploded.

In this exemplary embodiment, as shown in fig. 1, the liquid injection hole 12 may be located at the top surface of the battery case 1. This arrangement can facilitate injection of electrolyte into the receiving chamber 11 through the injection hole 12.

In this exemplary embodiment, as shown in fig. 1, the battery may further include a pole 3, at least part of the structure of the pole 3 may be located outside the battery case, and the pole 3 may be connected with the battery cell. As shown in fig. 1, the battery in the present exemplary embodiment may include two poles 3: positive and negative electrode posts. It should be understood that in other exemplary embodiments, the battery may also include only one pole and the battery housing may be multiplexed into another pole.

As shown in fig. 2, a schematic structural diagram of another exemplary embodiment of a battery of the present disclosure is shown. The liquid injection hole 12 may also be located at a side surface between the bottom surface and the top surface of the battery case 1. The explosion-proof valve 2 may be provided on a side surface other than the bottom surface of the battery case.

In this exemplary embodiment, the battery may be a square battery, that is, the battery may be a quadrangular battery, and 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 the corners between sides are not necessarily right angles, and may be arc transitions.

In other exemplary embodiments, the battery may be of any other structure, for example, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end faces and a curved face between the two circular end faces.

The battery is a minimum unit that includes an electric core and an electrolyte and is 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.

The battery can be a laminated battery, the laminated battery is convenient to group, and the battery with longer length can be obtained through processing. 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 the wound battery, a plurality of laminated single-piece tabs may be wound from the same pole piece.

The present exemplary embodiment also provides a battery pack, which may be 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, and the cylindrical battery may be disposed on the support plate, thereby forming a battery module.

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 disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure 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. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

The drawings in the present disclosure relate only to the structures to which the present disclosure relates, and other structures may be referred to in general. The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the disclosed embodiments without departing from the spirit and scope of the disclosed embodiments, which are intended to be encompassed within the scope of the appended 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, the battery comprising:

a battery housing (1), wherein the battery housing (1) is provided with a containing cavity (11) and a liquid injection hole (12) communicated with the containing cavity (11);

the battery cell is positioned in the accommodating cavity (11);

the explosion-proof valve (2) is arranged on the battery shell (1), and the explosion-proof valve (2) and the liquid injection hole (12) are positioned on different sides of the battery shell (1);

the distance between the explosion-proof valve (2) and the liquid injection hole (12) in the first direction (Y) is 40-120 mm, the first direction (Y) is perpendicular to the side face where the explosion-proof valve (2) is located, and the tightness ratio between the battery shell (1) and the battery cell is as follows: 80% -95%.

2. The battery according to claim 1, wherein the battery case (1) includes:

a main housing (13), wherein an opening is formed on the main housing (13);

and the cover plate assembly (14) is covered on the opening, and the liquid injection hole (12) is formed on the cover plate assembly (14).

3. The battery according to claim 1, characterized in that the explosion-proof valve (2) and the liquid filling hole (12) are located at opposite sides of the battery case (1).

4. The battery according to claim 1, characterized in that the side of the explosion-proof valve (2) is parallel to the side of the liquid filling hole (12).

5. A battery according to claim 3, characterized in that the centre line of the filling opening (12) is arranged offset from the centre line of the explosion-proof valve (2).

6. The battery according to claim 5, wherein a distance between a center line of the liquid injection hole (12) and a center line of the explosion-proof valve (2) is L1, a geometric radius of an opening of a side of the liquid injection hole (12) facing the accommodating chamber (11) is r, wherein r/L1 is 1/20 or more and 1/2 or less.

7. The battery according to claim 1, characterized in that the explosion-proof valve (2) is located at the bottom surface of the battery case (1).

8. The battery according to claim 1, characterized in that the liquid filling hole (12) is located at the top surface of the battery case (1).

9. The battery according to claim 1, characterized in that the liquid filling hole (12) is located at a side between the bottom surface and the top surface of the battery case (1).

10. The battery according to any one of claims 1 to 9, characterized in that the explosion-proof valve (2) and the battery housing (1) are of unitary construction.

11. The battery according to claim 10, wherein the explosion-proof valve (2) comprises one or more of a score, a thinned region.

12. The battery of any one of claims 1-9, wherein the battery is a quadrangular battery.

13. A battery comprising a battery according to any one of claims 1-12.