CN219717159U

CN219717159U - Battery and battery pack

Info

Publication number: CN219717159U
Application number: CN202321013957.0U
Authority: CN
Inventors: 马俊杰; 沈玉阳
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: 2023-09-19
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 pack comprises: the battery comprises a battery shell and an explosion-proof valve arranged on the bottom surface of the battery shell; the support piece is used for supporting the bottom surface of the battery shell; the bonding layer is bonded between the bottom surface of the battery shell and the supporting piece and is positioned on at least one side around the explosion-proof valve; the area of the bonding layer is S1, the area of the bottom surface of the battery shell is S2, and S1/S2 is more than or equal to 30% and less than or equal to 60%. The battery pack can enable the explosion-proof valve to be more easily exploded on the premise of ensuring the bonding strength between the battery and the supporting piece.

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 a battery case, and an explosion-proof valve provided on the battery case, the explosion-proof valve may be provided on a bottom surface of the battery case, and the battery case may be further required to be fixed to a support member by an adhesive layer provided on the bottom surface thereof. However, the adhesive layer may cause the explosion-proof valve to be not easily opened, thereby affecting the sensitivity of the explosion-proof valve.

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 pack which can solve the technical problem that an explosion-proof valve is not easy to open.

The battery pack includes:

the battery comprises a battery shell and an explosion-proof valve arranged on the bottom surface of the battery shell;

a support for supporting the bottom surface of the battery case;

a bonding layer bonded between the bottom surface of the battery case and the support member, the bonding layer being located on at least one side around the explosion-proof valve;

the area of the bonding layer is S1, the area of the bottom surface of the battery shell is S2, and S1/S2 is more than or equal to 30% and less than or equal to 60%.

The battery pack provided by the utility model sets the ratio between the adhesive layer area S1 and the battery case bottom surface area S2 to a proper range. On one hand, the battery pack provided by the utility model can not cause insufficient bonding strength between the battery and the support member due to the fact that the area of the bonding layer is too small; on the other hand, the battery pack provided by the utility model is not easy to open due to the fact that the area of the bonding layer is too large.

The present utility model also provides a battery including:

a battery case;

the explosion-proof valve is arranged on the bottom surface of the battery shell;

wherein the bottom surface of the battery case further comprises a coating area positioned on at least one side around the explosion-proof valve, and the coating area is used for coating an adhesive to fix the battery on a target structure;

an insulating film which is coated on at least part of the outer surface of the battery shell and covers the bottom surface of the battery shell except the coating area;

the area of the coating area is S1, the area of the bottom surface of the battery shell is S2, and S1/S2 is more than or equal to 30% and less than or equal to 60%.

The battery provided by the utility model can enable the explosion-proof valve to be easily exploded on the premise of meeting the bonding strength between the battery and a target structure.

The present utility model also provides a battery characterized by comprising:

a battery case;

an insulating film which is coated on at least part of the outer surface of the battery shell, and covers the coating area and the bottom surface of the battery shell except the explosion-proof valve;

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 pack of the present disclosure;

FIG. 2 is a schematic view of the bottom surface of the battery case in the battery pack shown in FIG. 1;

FIG. 3 is a schematic view of the structure of the bottom surface and adhesive layer of the battery case in the battery pack of FIG. 1;

fig. 4 is a schematic view of the structure of the bottom surface of a battery case in an exemplary embodiment of a battery pack of the present disclosure;

fig. 5 is a schematic view of the structure of the bottom surface of a battery case in an exemplary embodiment of a battery pack of the present disclosure;

FIG. 6 is a schematic view of the structure of the bottom surface of an exemplary embodiment of a battery of the present disclosure;

fig. 7 is a schematic view of the structure of the bottom surface in an 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 pack, as shown in fig. 1-3, fig. 1 is a schematic structural view of an exemplary embodiment of the battery pack of the present disclosure, fig. 2 is a schematic structural view of a bottom surface of a battery case in the battery pack of fig. 1, and fig. 3 is a schematic structural view of a bottom surface and an adhesive layer of a battery case in the battery pack of fig. 1.

The battery pack includes: a battery 1, a support 3, an adhesive layer 4. The battery 1 comprises a battery shell 11 and an explosion-proof valve 2 arranged on the bottom surface of the battery shell 11; the support 3 is used for supporting the bottom surface of the battery shell 11; an adhesive layer 4 is adhered between the bottom surface of the battery case 11 and the support member 3, and the adhesive layer 4 is positioned on at least one side around the explosion-proof valve 2; wherein the area of the adhesive layer 4 is S1, and the area of the bottom surface of the battery case 11 is S2, and S1/S2 is 30% or more and 60% or less.

When the battery pack is formed by the batteries, the bottom surface of the battery case is a side surface of the battery case supported by a bottom plate in the battery pack, and the top surface of the battery case is an opposite side surface to the bottom surface.

The battery pack provided by the present exemplary embodiment sets the ratio between the adhesive layer area S1 and the battery case bottom surface area S2 to a suitable range. On the one hand, the battery pack provided by the present exemplary embodiment does not cause insufficient adhesive strength between the battery and the support member due to an excessively small area of the adhesive layer; on the other hand, the battery pack provided by the present exemplary embodiment also does not cause the explosion-proof valve to be not easily exploded due to the excessively large area of the adhesive layer.

In the present exemplary embodiment, S1/S2 may be equal to 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

In this exemplary embodiment, as shown in fig. 1-3, the explosion-proof valve 2 may be disposed near the centroid of the bottom surface of the battery case 11, the adhesive layer 4 may include two sub-adhesive layers 41, and the two sub-adhesive layers 41 may be disposed at opposite sides of the explosion-proof valve 2, which may more stably fix the battery to the support.

It should be appreciated that in other exemplary embodiments, the adhesive layer 4 may be located at other locations around the flameproof valve 2, for example, the adhesive layer 4 may be wrapped around the flameproof valve 2, and the adhesive layer 4 may be located on one side of the flameproof valve 2. In the present exemplary embodiment, the adhesive layer 4 may be rectangular, and in other exemplary embodiments, the adhesive layer 4 may also be circular, polygonal, irregular, or the like.

In this exemplary embodiment, as shown in fig. 1 to 3, the bottom surface of the battery case 11 includes a coating area 111 bonded to the adhesive layer 4, and the coating area 111 may coincide with the area where the adhesive layer 4 is located. The battery 1 may further include: an insulating film 6, the insulating film 6 may cover at least part of the outer surface of the battery case 11 except the coating region 111. In the present exemplary embodiment, the insulating film 6 may be used to insulate the battery case from other conductive structures. The present exemplary embodiment exposes the coating region 111 to the outside of the insulating film 6, and the adhesive layer 4 may be directly bonded to the battery case. On the one hand, the adhesive layer 4 is directly connected with the battery case 11, so that the stability of the battery adhesion can be increased; on the other hand, the adhesive layer 4 is not adhered to the insulating film 6, so that the insulating film 6 can be prevented from being damaged when the battery is detached. In the present exemplary embodiment, the adhesive layer 4 may be an insulating structure.

In the present exemplary embodiment, as shown in fig. 1 to 3, the explosion-proof valve 2 may be exposed to the outside of the insulating film 6. This arrangement can avoid the blocking of the explosion-proof valve 2 by the insulating film 6, thereby making the explosion-proof valve 2 more easily explosive. It should be appreciated that in other exemplary embodiments, the insulating film 6 may also cover the explosion-proof valve 2, and that the insulating film 6 may reduce the risk of shorting the battery housing and the support 3.

In the present exemplary embodiment, as shown in fig. 1 to 3, the distance L between the adhesive layer 4 and the explosion-proof valve 2 may be 1mm or more, for example, the distance between the adhesive layer 4 and the explosion-proof valve 2 may be 1mm, 2mm, 3mm, 4mm, 5mm, 10mm, 15mm, 20mm, or the like. This arrangement can further reduce the impact of the adhesive layer 4 on the bursting of the burst valve 2.

In the present exemplary embodiment, as shown in fig. 4, a schematic view of the structure of the bottom surface of the battery case in one exemplary embodiment of the battery pack of the present disclosure is shown. The bottom surface of the battery case 11 is formed with a plurality of grooves 5 facing the inside of the battery case 11, and at least part of the structure of the adhesive layer 4 is located in the grooves 5. Wherein the groove 5 may be integrally formed with the battery case through a stamping process. On the one hand, when the adhesive is applied to the application region 111 to form the adhesive layer 4, the adhesive may be filled in the groove 5, so that outflow of the adhesive may be prevented; on the other hand, this arrangement can increase the bonding area between the coated region 111 and the adhesive layer 4, thereby improving the firmness between the adhesive layer 4 and the battery case.

As shown in fig. 4, the grooves 5 may be hemispherical, it being understood that in other exemplary embodiments, the grooves 5 may also be other shapes, e.g., the grooves may be cylindrical, conical, semi-ellipsoidal, etc. Furthermore, the grooves 5 may be one, and the region where the grooves 5 are located and the coating region 111 may coincide.

In the present exemplary embodiment, as shown in fig. 5, a schematic view of the structure of the bottom surface of the battery case in one exemplary embodiment of the battery pack of the present disclosure is shown. The battery case 11 further includes: a plurality of protruding structures 7, the protruding structures 7 are located on the outer surface of the bottom surface of the battery shell 11, and the adhesive layer 4 is adhered to the protruding structures 7. The protrusion structure 7 may be formed by punching the bottom surface of the battery case to the outside, and the protrusion structure 7 may also increase the bonding area between the coating region 111 and the adhesive layer 4 to improve the firmness between the adhesive layer 4 and the battery case.

In the present exemplary embodiment, as shown in fig. 5, the protrusion structure 7 may be of a hemispherical type, and it should be understood that in other exemplary embodiments, the protrusion structure 7 may also be of other shapes, for example, the protrusion structure 7 may be of a cylindrical shape, a conical shape, a semi-ellipsoidal shape, or the like. The grooves can be cylindrical, conical, semi-ellipsoidal, etc.

In the present exemplary embodiment, the explosion-proof valve 2 may be integrally structured with the battery case 11, and for example, the explosion-proof valve 2 may be formed by punching the battery case 11. 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 11 may be located on 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 2 may be a thinned region formed by punching, or the explosion-proof valve may be a thinned region of the battery case itself.

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 11, for example, the explosion-proof valve 2 may be a patch attached to the explosion-proof opening of the battery housing.

In the present exemplary embodiment, the explosion-proof valve 2 located at the bottom surface of the battery case can reduce damage to surrounding persons and things when it is exploded.

In the present exemplary embodiment, as shown in fig. 1, the battery case 11 may include: a main housing 112, a cover plate assembly 113, the main housing 112 having an opening formed therein; the cover assembly 113 is capped on the opening, and the cover assembly 113 may form the top surface of the battery case 11, and the battery cell may be mounted into the receiving chamber 114 formed in the battery case 11 through the opening formed in the main case 112.

In this exemplary embodiment, as shown in fig. 1, the battery may further include a post 8 connected to the battery cell, at least part of the structure of the post 8 may be located outside the battery case, and the post 8 may be located on the top surface of the battery case. As shown in fig. 1, the battery in the present exemplary embodiment may include two poles 8: 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.

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 battery pack 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.

The present exemplary embodiment also provides a battery, as shown in fig. 1 and 6, and fig. 6 is a schematic structural view of the bottom surface in an exemplary embodiment of the battery of the present disclosure. The battery includes: battery case 11, explosion-proof valve 2, and insulating film 6. The explosion-proof valve 2 is arranged on the bottom surface of the battery shell 11; wherein the bottom surface of the battery case 11 includes a coating region 111 located at least one side around the explosion-proof valve 2, the coating region 111 being used to coat an adhesive to fix the battery to a target structure; the insulating film 6 is coated on at least part of the outer surface of the battery case 11, that is, on the bottom surface of the battery case, and the insulating film 6 exposes only the coating region 111. And the insulating film covers the bottom surface of the battery case except the coating region 111; wherein the area of the coating area 111 is S1, the area of the bottom surface of the battery case 11 is S2, and S1/S2 is 30% or more and 60% or less.

The battery provided by the present exemplary embodiment sets the ratio between the coating area S1 and the battery case bottom surface area S2 to a suitable range. On the one hand, the battery pack provided by the present exemplary embodiment does not cause insufficient adhesive strength between the battery and the support member due to an excessively small area of the coating region; on the other hand, the battery pack provided by the utility model can not cause the explosion-proof valve to be difficult to open because of the overlarge area of the coating area.

The present exemplary embodiment also provides a battery, as shown in fig. 1 and 7, and fig. 7 is a schematic structural view of the bottom surface in an exemplary embodiment of the battery of the present disclosure. The battery includes: battery case 11, explosion-proof valve 2, and insulating film 6. The explosion-proof valve 2 is arranged on the bottom surface of the battery shell 11; wherein the bottom surface of the battery case 11 further includes a coating region 111 located at least one side around the explosion-proof valve 2, the coating region 111 being used to apply an adhesive to fix the battery to a target structure; the insulating film 6 is coated on at least part of the outer surface of the battery case, and covers the coating region 111 and the bottom surface of the battery case 11 except the explosion-proof valve 2, that is, on the bottom surface of the battery case, the insulating film 6 only exposes the coating region 111 and the explosion-proof valve 2. Wherein the area of the coating area 111 is S1, the area of the bottom surface of the battery case 11 is S2, and S1/S2 is 30% or more and 60% or less.

Also, the battery provided by the present exemplary embodiment sets the ratio between the coating area S1 and the battery case bottom surface area S2 to a suitable range. On the one hand, the battery pack provided by the present exemplary embodiment does not cause insufficient adhesive strength between the battery and the support member due to an excessively small area of the coating region; on the other hand, the battery pack provided by the utility model can not cause the explosion-proof valve to be difficult to open because of the overlarge area of the coating area.

In the present exemplary embodiment, as shown in fig. 7, the coating region 111 and the region where the explosion-proof valve 2 is located are isolated by the insulating film 6. It should be understood that in other exemplary embodiments, the coating area 111 and the area of the explosion proof valve 2 may be isolated without the insulating film 6. At this time, the manner of determining the area of the coating region 111 may include: the difference of the area of the bottom surface of the battery case exposed to the outside of the insulating film 6 minus the area of the explosion-proof valve 2 was calculated as the area of the coating region 111. When the explosion-proof valve 2 has a solid structure such as a patch, the area of the patch is the area of the explosion-proof valve; when the explosion-proof valve 2 is formed by the notch of the closed shape, the area of the pattern formed by the notch of the closed shape is the area of the explosion-proof valve; when the explosion-proof valve 2 is formed by the non-closed-shape score, the area of the minimum circumcircle of the non-closed-shape score is the area of the explosion-proof valve, and the minimum circumcircle is the minimum circle covering the score.

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 pack, the battery pack comprising:

the battery (1), the said battery (1) includes the battery shell (11) and sets up in the explosion-proof valve (2) of the said battery shell (11) bottom surface;

a support (3) for supporting the bottom surface of the battery case (11);

an adhesive layer (4) adhered between the bottom surface of the battery shell (11) and the support piece (3), wherein the adhesive layer (4) is positioned on at least one side around the explosion-proof valve (2);

the area of the bonding layer (4) is S1, the area of the bottom surface of the battery shell (11) is S2, and S1/S2 is more than or equal to 30% and less than or equal to 60%.

2. The battery according to claim 1, wherein the adhesive layer (4) comprises two sub-adhesive layers (41), the two sub-adhesive layers (41) being located on opposite sides of the explosion-proof valve (2), respectively.

3. The battery pack according to claim 1, wherein the bottom surface of the battery case (11) includes a coating region (111) bonded to the adhesive layer (4), the battery (1) further comprising:

and an insulating film (6), wherein the insulating film (6) is coated on at least part of the outer surface except the coating area (111) of the battery shell (11).

4. A battery according to claim 3, characterized in that the insulating film (6) covers the explosion-proof valve (2);

alternatively, the explosion-proof valve (2) is exposed to the outside of the insulating film (6).

5. Battery according to claim 1, characterized in that the bottom surface of the battery housing (11) is formed with at least one recess (5) facing the inside of the battery housing (11), at least part of the structure of the adhesive layer (4) being located in the recess (5).

6. The battery pack according to claim 1, wherein the battery case (11) further includes:

at least one protruding structure (7), protruding structure (7) are located the surface of battery case (11) bottom surface, tie coat (4) bond on protruding structure (7).

7. The battery pack according to claim 1, wherein a distance between the adhesive layer (4) and the explosion-proof valve (2) is 1mm or more.

8. The battery pack according to any one of claims 1 to 7, wherein the explosion-proof valve (2) and the battery case (11) are of unitary structure.

9. The battery pack according to claim 8, wherein the explosion-proof valve (2) includes a score formed at a bottom surface of the battery case (11).

10. The battery according to any one of claims 1-7, wherein the battery (1) is a quadrangular battery.

11. A battery, the battery comprising:

a battery case (11);

an explosion-proof valve (2) provided on the bottom surface of the battery case (11);

wherein the bottom surface of the battery case (11) further comprises a coating area (111) positioned at least on one side around the explosion-proof valve (2), and the coating area (111) is used for coating an adhesive to fix the battery on a target structure;

an insulating film (6), wherein the insulating film (6) is coated on at least part of the outer surface of the battery shell (11), and the insulating film (6) covers the bottom surface of the battery shell (11) except the coating area (111);

the area of the coating area (111) is S1, the area of the bottom surface of the battery shell (11) is S2, and S1/S2 is more than or equal to 30% and less than or equal to 60%.

12. A battery, the battery comprising:

a battery case (11);

an insulating film (6), wherein the insulating film (6) is coated on at least part of the outer surface of the battery shell (11), and the insulating film (6) covers the coating area (111) and the bottom surface of the battery shell (11) except the explosion-proof valve (2);