CN220585462U - Battery and battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery and a battery device, wherein the battery comprises: the electrode assembly comprises an electrode body and a tab connected to the electrode body; the conducting strip is positioned at one side of the electrode body, and the electrode lug extends from the electrode body to the surface of the conducting strip, which is away from the electrode body; the cover plate assembly comprises a cover plate, a first insulating piece and a second insulating piece, wherein the cover plate is positioned at one side of the conducting strip, which is away from the electrode body, the first insulating piece is positioned between the electrode body and the conducting strip, and the second insulating piece is positioned between the conducting strip and the cover plate; wherein the dimension of the first insulating member in the thickness direction thereof is L1, the dimension of the second insulating member in the thickness direction thereof is L2, and L2/L1 is 0.2-2. The battery provided by the disclosure has higher energy density and structural stability.

Description

Battery and battery device

Technical Field

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

Background

In the related art, the battery may include a conductive sheet, an electrode body, and a cap plate, and an insulating member is required to be provided between the conductive sheet and the electrode body and between the cap plate and the conductive sheet. However, the two insulators may result in lower space utilization inside the battery, thereby affecting the energy density of the battery.

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 of low energy density of the battery.

The battery includes:

an electrode assembly including an electrode body and a tab connected to the electrode body;

the electrode body is provided with a plurality of lugs, and the lugs are arranged on the surface of the electrode body;

the cover plate assembly comprises a cover plate, a first insulating piece and a second insulating piece, wherein the cover plate is positioned on one side of the conducting strip, which is away from the electrode body, the first insulating piece is positioned between the electrode body and the conducting strip, and the second insulating piece is positioned between the conducting strip and the cover plate;

the first insulating piece is L1 in the thickness direction, the second insulating piece is L2 in the thickness direction, and L2/L1 is 0.2-2.

In the utility model, L2/L1 is too large, the dimension of the second insulating piece in the thickness direction is too large, and the space utilization rate in the battery is low, so that the energy density of the battery is low; the L2/L1 is too small, the size of the second insulating part in the thickness direction is too small, the second insulating part is difficult to stably support the cover plate, and meanwhile, the too small size of the second insulating part in the thickness direction can also cause insufficient creepage distance between the conducting strip and the cover plate, so that the cover plate is electrified. The L2/L1 is set to be of a proper size, so that the energy density of the battery can be ensured, and meanwhile, the structural stability and the safety of the battery can be improved.

The utility model also provides a battery device which comprises the battery with higher energy density, structural stability and safety, so that the battery device also has higher energy density, structural stability and safety.

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

fig. 3 is a schematic view of a first insulating member, a conductive sheet, and a tab in an exemplary embodiment of a battery of the present disclosure;

fig. 4 is a schematic structural view of a first insulating member in an exemplary embodiment of a battery of the present disclosure.

Reference numerals illustrate:

1. an electrode assembly; 11. an electrode body; 12. a tab; 121. an extension; 2. a conductive sheet; 31. a cover plate; 32. a first insulating member; 33. a second insulating member; 41. a first through hole; 42. a second through hole; 43. a third through hole; 44. a fourth through hole; 5. a pressure relief structure; 61. a positive electrode post; 62. and a negative electrode column.

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. 1-4, fig. 1 is a schematic structural diagram of an exemplary embodiment of a battery of the present disclosure, fig. 2 is a schematic structural diagram of an assembled exemplary embodiment of a battery of the present disclosure, fig. 3 is a schematic structural diagram of a first insulating member, a conductive sheet, and a tab of an exemplary embodiment of a battery of the present disclosure, and fig. 4 is a schematic structural diagram of a first insulating member of an exemplary embodiment of a battery of the present disclosure.

The battery includes: the electrode assembly 1, the conducting strip 2 and the cover plate assembly, wherein the electrode assembly 1 comprises an electrode body 11 and a tab 12 connected to the electrode body 11; the conducting strip 2 is positioned on one side of the electrode body 11, and the tab 12 extends from the electrode body 11 to the surface of the conducting strip 2 facing away from the electrode body 11; the cover plate assembly comprises a cover plate 31, a first insulating part 32 and a second insulating part 33, wherein the cover plate 31 is positioned on one side of the conductive sheet 2, which is away from the electrode body 11, the first insulating part 32 is positioned between the electrode body 11 and the conductive sheet 2, and the second insulating part 33 is positioned between the conductive sheet 2 and the cover plate 31; wherein the dimension of the first insulating member 32 in the thickness direction thereof is L1, the dimension of the second insulating member 33 in the thickness direction thereof is L2, and L2/L1 is 0.2-2.

In the present exemplary embodiment, the L2/L1 is excessively large, the size of the second insulating member 33 in the thickness direction thereof is excessively large, and the space utilization rate inside the battery is low, resulting in a low energy density of the battery; too small L2/L1, too small a size of the second insulating member 33 in the thickness direction thereof, makes it difficult for the second insulating member 33 to form stable support for the cap plate 31, and at the same time, too small a size of the second insulating member 33 in the thickness direction thereof may also cause insufficient creepage distance between the conductive sheet 2 and the cap plate 31, thereby causing the cap plate 31 to become charged. The present exemplary embodiment sets L2/L1 to an appropriate size, which can not only secure the energy density of the battery but also improve the structural stability and safety of the battery.

In the present exemplary embodiment, L2/L1 may be equal to 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.

The first insulating member 32 and the second insulating member 33 may have a structure such as a groove or a protrusion, and the dimension of the first insulating member 32 in the thickness direction thereof is the largest dimension of the first insulating member 32 in the thickness direction thereof, and the dimension of the second insulating member 33 in the thickness direction thereof is the largest dimension of the second insulating member 33 in the thickness direction thereof. It should be understood that in other exemplary embodiments, the dimension of the first insulating member 32 in the thickness direction thereof may be the dimension of any position of the first insulating member 32 in the thickness direction thereof; the dimension of the second insulating member 33 in the thickness direction thereof may be any position of the second insulating member 33 in the thickness direction thereof.

In the present exemplary embodiment, the thickness direction of the first insulating member 32 and the thickness direction of the second insulating member 33 may be parallel to the extraction direction X of the tab 12 from the electrode body 11.

In the present exemplary embodiment, as shown in fig. 1 to 4, the first insulating member 32 may have a larger dimension in the thickness direction thereof than the second insulating member 33. Too small a size of the first insulating member 32 in the thickness direction thereof increases the risk of shorting between the electrode body and the conductive sheet, and too large a size of the second insulating member 33 in the thickness direction thereof affects the space utilization inside the battery. The present exemplary embodiment sets the size of the first insulating member 32 in the thickness direction thereof larger and the size of the second insulating member 33 in the thickness direction thereof smaller, so that it is possible to improve the space utilization inside the battery while also reducing the risk of short-circuiting the electrode body 21 and the conductive sheet 2.

In the present exemplary embodiment, as shown in fig. 1 to 4, the first insulating member 32 has a dimension in the thickness direction thereof of 1.5mm to 5mm. For example, the first insulating member 32 has a dimension in the thickness direction thereof of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm. The second insulator 33 has a dimension in the thickness direction thereof of 0.3mm to 3mm. For example, the second insulating member 33 has a dimension in the thickness direction thereof of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, or the like.

In the present exemplary embodiment, as shown in fig. 1-4, the battery may include a plurality of tabs 12; the conductive sheet 2 is formed with a first through hole 41, and a part of the tab 12 penetrates through the first through hole 41 to extend to one side of the conductive sheet 2 away from the electrode body 11; part of the tab 12 is arranged around the edge of the conductive sheet 2 to extend to the side of the conductive sheet 2 facing away from the electrode body 11. This arrangement can avoid the tab 12 from being folded a plurality of times, and thus can improve the space utilization of the battery in the distribution direction of the conductive sheet 2 and the electrode body 11.

In this exemplary embodiment, the electrode body may include positive and negative electrode sheets including a current collector and an active material on at least one side of the current collector, and a separator between the positive and negative electrode sheets. The tab may include a positive tab and a negative tab. The positive electrode lug is connected with the current collector in the positive electrode sheet, for example, the positive electrode lug can be formed by cutting the positive electrode current collector; the negative electrode tab is connected to a current collector in the negative electrode sheet, for example, the negative electrode tab may be formed by cutting the negative electrode current collector.

In the present exemplary embodiment, as shown in fig. 1 to 4, the second through hole 42 is formed on the first insulating member 32, and the tab 12 penetrating the first through hole 41 may be disposed through the second through hole 42; the tab 12, which is wound around the edge of the conductive sheet 2, may also be provided around the edge of the first insulating member 32. Among the first through hole 41 and the second through hole 42 penetrated by the same tab, the projection of the first through hole 41 in the depth direction is located within the projection of the second through hole 42 in the depth direction, and this arrangement can facilitate the tab to penetrate the first through hole 41 and the second through hole 42 in sequence.

It should be understood that in other exemplary embodiments, the tabs in the battery may all be disposed through the first through holes on the conductive sheet, or the conductive sheet may not be provided with the first through holes, and the tabs in the battery may all be disposed around the edges of the conductive sheet. In addition, as shown in fig. 1 to 4, the battery includes a plurality of electrode assemblies 1, and a plurality of tabs may be welded to the same conductive sheet 2. It should be understood that in other exemplary embodiments, the battery may include other numbers of electrode assemblies, and other numbers of tabs may be welded to the conductive sheet, for example, the battery may include one electrode assembly, and only one tab may be welded to the conductive sheet 2.

In the present exemplary embodiment, as shown in fig. 1 to 4, the tab 12 includes an extension 121 on a side of the conductive sheet 2 away from the electrode body 11, and the extension 121 is welded to a side of the conductive sheet 2 away from the electrode body 11. The extension 121 may be laser welded to the conductive sheet 2.

In this exemplary embodiment, as shown in fig. 1 to 4, the conductive sheet 2 may be located on the side of the electrode assembly where the tab 12 is located, and after the tab 12 extends to the side of the conductive sheet 2 facing away from the electrode body 11, the tab may be bent to form an extension 121 welded to the side of the conductive sheet 2 facing away from the electrode body 11, where the thickness direction of the extension 121 is parallel to the thickness direction of the conductive sheet.

In the present exemplary embodiment, as shown in fig. 1 to 4, the battery further includes a pressure release structure 5 disposed on the cover plate 31, the first insulating member 32 is formed with a third through hole 43, and the second insulating member 33 is formed with a fourth through hole 44; wherein, the projection of the third through hole 43 in the depth direction thereof, the projection of the fourth through hole 44 in the depth direction thereof and the projection of the pressure release structure in the depth direction of the third through hole 43 have a common overlapping area. The high-pressure gas released when the electrode body 21 is thermally out-of-control may sequentially pass through the third through-hole 43, the fourth through-hole 44, and the pressure release structure 5 to be released to the outside of the battery.

In this exemplary embodiment, the pressure relief structure 5 may be a patch attached to the explosion-proof opening. In other exemplary embodiments, the relief structure 5 may be formed by a score located on the cover plate 31. The score on the cover 31 may be located on the outside of the cover 31. 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 pressure relief structure 5 can also be a thinning area formed by stamping, and the pressure relief structure can also be a thinning area of the cover plate.

When the pressure relief structure 5 is a solid structure such as a patch and a thinning area, the projection of the patch and the thinning area in the depth direction of the third through hole 43 is the projection of the pressure relief structure in the depth direction of the third through hole 43; when the pressure relief structure 5 is formed by the notch in the closed shape, the projection of the area surrounded by the notch in the closed shape in the depth direction of the third through hole 43 is the projection of the pressure relief structure in the depth direction of the third through hole 43; when the pressure relief structure 5 is formed by the non-closed-shape score, the smallest circumscribed circle of the projection of the non-closed-shape score in the depth direction of the third through hole 43 is the orthographic projection of the pressure relief structure on the projection plane.

In the present exemplary embodiment, as shown in fig. 1 to 4, the battery may include two conductive sheets 2: the tab in the electrode assembly 1 may include a positive tab and a negative tab, the positive tab and the positive tab are welded, and the negative tab are welded. The cover plate assembly may further include two poles: positive electrode post 61, negative electrode post 62, positive electrode post 61 can be connected with positive electrode conducting strip electricity, and negative electrode post 62 can be connected with negative electrode conducting strip electricity.

In the present exemplary embodiment, the first insulating member 32 and the second insulating member 33 may be plastic members. It should be appreciated that in other exemplary embodiments, the first insulator 32 and the second insulator 33 may also be other insulators, for example, the first insulator 32 and the second insulator 33 may be rubber, mica, ceramic, or the like.

In the present exemplary embodiment, the elastic modulus of the first insulating member may be 1000Mpa to 12000Mpa. For example, the modulus of elasticity of the first insulating member 32 may be 1000Mpa, 2000Mpa, 3000Mpa, 4000Mpa, 5000Mpa, 6000Mpa, 7000Mpa, 8000Mpa, 9000Mpa, 10000Mpa, 11000Mpa, 12000Mpa. The elastic modulus of the first insulating member is too small, and the strength of the first insulating member is insufficient; the elastic modulus of the first insulating member 32 is excessively large, and the first insulating member 32 easily scratches the electrode sheet and the separator in the electrode body 11. The present exemplary embodiment sets the elastic modulus of the first insulating member to an appropriate magnitude, which can reduce the risk of the first insulating member scratching the electrode body 11 while ensuring the strength of the first insulating member.

In this exemplary embodiment, as shown in fig. 1-4, the battery may further include a main case 34, in which the electrode body is located in the main case 34, and a cover plate 31 is provided to cover the opening formed in the main case 34.

In the present exemplary embodiment, the battery may be a lithium ion battery, it being understood that in other exemplary embodiments, the battery may also be a cadmium nickel battery, a nickel hydrogen battery, a lithium polymer battery, or the like.

The battery includes an electrode assembly and an electrolyte, and is capable of performing a minimum unit of electrochemical reaction such as charge/discharge. The electrode assembly refers to a unit formed by winding or laminating a stack including a first electrode sheet, a separator, and a second electrode sheet. 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 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 this exemplary embodiment, the battery may also be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end faces and a curved surface between the two circular end faces.

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 electrode assembly is a laminated electrode assembly having a first electrode sheet, a second electrode sheet opposite in electrical property to the first electrode sheet, and a separator sheet disposed between the first electrode sheet and the second electrode sheet, so that a plurality of pairs of the first electrode sheet and the second electrode sheet are stacked to form the laminated electrode assembly.

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

The present exemplary embodiment also provides a battery device, which in the present exemplary embodiment 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, 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 (10)

1. A battery, the battery comprising:

an electrode assembly (1), the electrode assembly (1) comprising an electrode body (11) and a tab (12) connected to the electrode body (11);

a conductive sheet (2) located at one side of the electrode body (11), the tab (12) extending from the electrode body (11) to a surface of the conductive sheet (2) facing away from the electrode body (11);

the cover plate assembly comprises a cover plate (31), a first insulating piece (32) and a second insulating piece (33), wherein the cover plate (31) is positioned on one side of the conducting strip (2) away from the electrode body (11), the first insulating piece (32) is positioned between the electrode body (11) and the conducting strip (2), and the second insulating piece (33) is positioned between the conducting strip (2) and the cover plate (31);

wherein the first insulating member (32) has a dimension L1 in the thickness direction thereof, and the second insulating member (33) has a dimension L2 in the thickness direction thereof, wherein L2/L1 is 0.2-2.

2. The battery according to claim 1, wherein the first insulating member (32) has a larger dimension in the thickness direction thereof than the second insulating member (33).

3. The battery according to claim 1, wherein the first insulating member (32) has a dimension in a thickness direction thereof of 1.5mm to 5mm;

and/or the second insulator (33) has a dimension in the thickness direction thereof of 0.3mm to 3mm.

4. A battery according to any one of claims 1-3, characterized in that the tab (12) comprises an extension (121) at the side of the conductive sheet (2) remote from the electrode body (11), the extension (121) being welded to the side of the conductive sheet (2) remote from the electrode body (11).

5. A battery according to any one of claims 1-3, characterized in that the battery comprises one or more of the tabs (12);

the conducting strip (2) is provided with a first through hole (41), and at least part of the lug (12) penetrates through the first through hole (41) to extend to one side of the conducting strip (2) away from the electrode body (11);

and/or at least part of the tabs (12) are arranged around the edge of the conductive sheet (2) to extend to the side of the conductive sheet (2) facing away from the electrode body (11).

6. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

when the tab (12) penetrates through the first through hole (41), a second through hole (42) is formed in the first insulating piece (32), and the tab (12) penetrating through the first through hole (41) penetrates through the second through hole (42);

when the tab (12) is arranged around the edge of the conductive sheet (2), the tab (12) which bypasses the edge of the conductive sheet (2) is arranged around the edge of the first insulating member (32).

7. The battery according to claim 6, characterized in that the projection of the first through hole (41) in its depth direction is located within the projection of the second through hole (42) in its depth direction.

8. A battery according to any one of claims 1-3, wherein the first insulating member has an elastic modulus of 1000Mpa-12000Mpa.

9. A battery according to any one of claims 1 to 3, wherein the battery is a quadrangular battery.

10. A battery device, characterized in that it comprises a battery according to any one of claims 1-9.