CN218957870U - Battery and battery device - Google Patents

Abstract

The battery comprises a battery shell, wherein the battery shell comprises a first cover plate and a shell piece, one end of the shell piece is provided with an opening, the first cover plate is connected with the opening of the shell piece, a first connecting area is arranged on the outer side face of the shell piece and is positioned at one end, close to the first cover plate, of the shell piece, a second connecting area is arranged on one surface, far away from the shell main body, of the first cover plate, and the second connecting area is close to the edge of the first cover plate; the roughness of the second connection region is larger than that of the first connection region, and the difference between the roughness of the second connection region and that of the first connection region is larger than 0 and smaller than or equal to 6 mu m. And the stability of the connection of the battery shell is improved.

Description

Battery and battery device

Technical Field

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

Background

With the development and progress of technology, electric vehicles are increasingly used, and battery devices for supplying power to the electric vehicles are often provided in the electric vehicles. The battery device is provided with a battery, the battery comprises a battery shell and a battery core, a containing space is arranged in the battery shell, the battery core is arranged in the containing space, and devices such as the battery core are protected through the battery shell. The battery case may include a case member and a cap plate, which are welded, and the welding of the case member and the cap plate is susceptible to failure in the related art.

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

An object of the present disclosure is to provide a battery and a battery device, and further to at least improve the stability of the connection of the battery case to some extent.

According to an aspect of the present disclosure, there is provided a battery, including:

the battery shell comprises a first cover plate and a shell piece, at least one end of the shell piece is provided with an opening, the first cover plate is welded to the opening of the shell piece, a first connecting area is arranged on the outer side face of the shell piece and is positioned at one end, close to the first cover plate, of the shell piece, a second connecting area is arranged on the surface, far away from the shell body, of the first cover plate, and is close to the edge of the first cover plate;

wherein at least the roughness of the second connection region in the first cover plate is greater than the roughness of the first connection region, and the difference between the roughness of the second connection region and the roughness of the first connection region is greater than 0 and less than or equal to 6 μm.

The battery that this disclosed embodiment provided, including the battery casing, the battery casing has first apron and casing spare, the one end of casing spare is provided with the opening, first apron connects in the opening of casing spare, the surface of casing spare is provided with first connecting region, first connecting region is located the one end that the casing spare is close to first apron, the one side that the casing main part was kept away from to first apron is provided with the second connecting region, and the edge that the second connecting region is close to first apron, the roughness of second connecting region is greater than the roughness of first connecting region, and the roughness difference of second connecting region and first connecting region is greater than 0 and less than or equal to 6 mu m, the roughness difference through second connecting region and first connecting region is greater than 0 and less than or equal to 6 mu m, the inhomogeneous problem of welding that leads to has avoided first connecting region and second connecting region roughness difference too big, thereby the stability that the battery casing connects has been promoted.

According to another aspect of embodiments of the present disclosure, there is provided a battery device including the above-described battery.

The battery device that this disclosed embodiment provided includes the battery, battery casing has first apron and casing spare in the battery, the one end of casing spare is provided with the opening, first apron connects in the opening of casing spare, the surface of casing spare is provided with first connecting region, first connecting region is located the one end that the casing spare is close to first apron, the one side that the casing main part was kept away from to first apron is provided with the second connecting region, and the edge that the second connecting region is close to first apron, the roughness of second connecting region is greater than the roughness of first connecting region, and the roughness difference of second connecting region and first connecting region is greater than 0 and less than or equal to 6 mu m, roughness difference through second connecting region and first connecting region is greater than 0 and less than or equal to 6 mu m, the inhomogeneous problem of welding that the roughness difference of first connecting region and second connecting region is too big and leads to has been avoided, thereby the stability that the battery casing is connected has been promoted.

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

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic view of a battery according to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a battery provided in an exemplary embodiment of the present disclosure;

fig. 3 is a schematic structural view of a battery device according to an exemplary embodiment 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 connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

The exemplary embodiment of the present disclosure first provides a battery 100, as illustrated in fig. 1, the battery 100 includes a battery case 10, the battery case 10 includes a first cover plate 12 and a case member 11, at least one end of the case member 11 has an opening, the first cover plate 12 is welded to the opening of the case member 11, an outer surface of the case member 11 is provided with a first connection region 101, the first connection region 101 is located at an end of the case member 11 near the first cover plate 12, a side of the first cover plate 12 away from the case body 111 is provided with a second connection region 102, and the second connection region 102 is near an edge of the first cover plate 12; wherein the roughness of the second connection region 102 is greater than the roughness of the first connection region 101, and the difference between the roughness of the second connection region 102 and the roughness of the first connection region 101 is greater than 0 and less than or equal to 6 μm.

The battery provided by the embodiment of the disclosure comprises a battery shell 10, the battery shell 10 is provided with a first cover plate 12 and a shell piece 11, one end of the shell piece 11 is provided with an opening, the first cover plate 12 is connected to the opening of the shell piece 11, the outer surface of the shell piece 11 is provided with a first connecting area 101, the first connecting area 101 is positioned at one end of the shell piece 11 close to the first cover plate 12, one surface of the first cover plate 12 far away from the shell main body 111 is provided with a second connecting area 102, the second connecting area 102 is close to the edge of the first cover plate 12, the roughness of the second connecting area 102 is larger than that of the first connecting area 101, the difference between the roughness of the second connecting area 102 and the roughness of the first connecting area 101 is larger than 0 and smaller than or equal to 6 μm, the problem of uneven welding caused by overlarge difference between the roughness of the first connecting area 101 and the second connecting area 102 is avoided, and the roughness of the second connecting area 102 is set to be larger than that of the first connecting area 101 and the roughness of the first connecting area 101 is larger than that of the first connecting area 101 is equal to or smaller than 6 μm, and the stability of the battery is improved when the battery is adhered to the first connecting area 300, and the device is adhered to the first cover plate and the battery is adhered to the first cover plate 300.

The following will describe each part of the battery provided in the embodiments of the present disclosure in detail:

as shown in fig. 2, the battery may include a battery case 10, a battery cell 20, and a post 30, the battery cell 20 is provided inside the battery case 10, the post 30 is provided in the battery case 10, and the post 30 and the battery cell 20 are electrically connected. In the embodiment of the present disclosure, the battery case 10 and the electrode post 30 may be two electrodes of a battery, respectively, and the battery cell 20 is electrically connected to the battery case 10 and the electrode post 30, respectively.

The battery case 10 may include a case member 11 provided with an opening and a first cover plate 12 connected to the opening of the case member 11 to close the opening of the case member 11. The outer surface of the shell member 11 is provided with a first connecting area 101, the first connecting area 101 is positioned at one end of the shell member 11 close to the first cover plate 12, one surface of the first cover plate 12 far away from the shell main body 111 is provided with a second connecting area 102, and the second connecting area 102 is close to the edge of the first cover plate 12; the roughness of the second connection region 102 is greater than the roughness of the first connection region 101.

When the battery 100 is mounted in the case 300, the battery is often directly or indirectly adhered to the bottom plate 310 of the case 300. When the battery is adhered, the first cover plate 12 faces the bottom plate 310 of the box 300, and the connecting glue is arranged between the bottom plate 310 and the first cover plate 12, so that the stability of the adhesion between the battery and the bottom plate 310 can be improved by improving the roughness of the first cover plate 12.

Wherein, the shell member 11 comprises a shell main body 111 and a second cover plate 112, two ends of the shell main body 111 are provided with openings, and the first cover plate 12 is arranged at one end of the shell main body 111; the second cover plate 112 is disposed at an end of the housing main body 111 away from the first cover plate 12, and the second cover plate 112 and the housing main body 111 are in an integrally formed structure. For example, the second cover plate 112 and the case main body 111 may be integrally formed by stretching.

The connection mode of the first cover plate 12 and the housing member 11 may be welding, for example, the connection mode of the first cover plate 12 and the housing member 11 may be laser welding, and when welding, the first connection area 101 and the second connection area 102 have preset roughness, so that welding quality can be improved, and sealing performance and connection strength of the first cover plate 12 and the housing member 11 are improved.

Further, in order to improve the welding quality of the first cover plate 12 and the case member 11, the difference between the roughness of the second connection region 102 and the roughness of the first connection region 101 is greater than 0 and less than or equal to 6 μm. For example, the roughness of the first connection region 101 is a, and the roughness of the second connection region 102 is b, 0<b-a is less than or equal to 6 μm. The difference between the roughness of the first connection region 101 and the roughness of the second connection region 102 is greater than 0 and less than or equal to 6, so that the problem that when the same laser beam is used for welding due to the overlarge difference between the roughness of the first connection region 101 and the roughness of the second connection region 102, the difference between the welding effects of the two surfaces caused by the reflection difference between the first connection region 101 and the second connection region 102 is large is avoided, and the welding quality is further improved.

The thickness of the first cover plate 12 is greater than the wall thickness of the housing part 11. The thickness of the first cover plate 12 refers to the dimension of the first cover plate 12 in the cell axis direction, that is, the dimension from the side of the first cover plate 12 close to the case member 11 to the side of the first cover plate 12 away from the case member 11. The wall thickness of the housing member 11 refers to the wall thickness of the housing main body 111, that is, the difference between the radius of the outer surface of the housing main body 111 and the radius of the inner surface of the housing main body 111. The thickness of the first cover plate 12 is larger than the wall thickness of the housing member 11, so that the supporting effect of the first cover plate 12 and the connection strength of the first cover plate 12 and the housing member 11 can be improved.

During the use of the battery, the battery cell can generate gas in the battery shell 10 to form high-pressure gas to impact the first cover plate 12, and the thickness of the first cover plate 12 is larger than that of the shell piece 11, so that the impact resistance of the battery shell 10 can be ensured. When the roughness difference between the first cover plate 12 and the housing member 11 is relatively large, the difference between the reflection degrees of the first cover plate 12 and the housing member 11 is relatively large, and the first cover plate is relatively thick, so that poor welding between the first cover plate 12 and the housing member 11 is easily caused, and sealing failure between the first cover plate 12 and the housing member 11 is caused. Therefore, in the embodiment of the present disclosure, the difference between the roughness of the second connection region 102 and the roughness of the first connection region 101 is limited to be greater than 0 and less than or equal to 6 μm, so that poor welding can be avoided, and connection stability can be improved.

The explosion-proof valve may be a thinned area on the first cover plate 12, for example, an annular thinned area is disposed on the first cover plate 12, and an area surrounded by the annular thinned area is an explosion-proof area. The thinned region has a strength less than that of the peripheral region, and the region having weak strength is exploded by the burst battery when the battery is thermally out of control. The thickness of the first cover plate 12 is larger than the wall thickness of the shell 11, so that the influence on use caused by too low strength of the first cover plate 12 after the explosion-proof valve is processed can be avoided.

The first cover plate 12 and the housing member 11 are connected by laser welding, and the penetration of a molten pool is greater than or equal to 0.2w when the first cover plate 12 and the housing member 11 are welded, wherein w is the wall thickness of the housing member. The penetration of the molten pool is 0.2w or more when the first cover plate 12 and the housing member 11 are welded, so that the welding reliability of the first cover plate 12 and the housing member 11 can be ensured, and the sealing performance of the housing member 11 and the first cover plate 12 can be ensured.

Alternatively, the penetration of the molten pool when the first cover plate 12 and the housing part 11 are welded is equal to the wall thickness of the housing part 11. By the penetration of the molten pool being equal to the wall thickness of the case member 11 when the first cover plate 12 and the case member 11 are welded, the welding effect of the first cover plate 12 and the case member 11 can be improved, and the sealing performance of the first cover plate 12 and the case member 11 can be ensured.

By way of example, the battery provided in the embodiments of the present disclosure is a cylindrical battery, and on this basis, the battery case 10 is a hollow cylindrical structure. The first cover plate 12 has a disc structure, and the housing member 11 has a hollow cylindrical structure with one end opened. The housing member 11 includes a housing main body 111 and a second cover plate 112, the second cover plate 112 having a disk structure, and the housing main body 111 having a cylindrical structure.

In a possible embodiment of the present disclosure, the first connection area 101 is disposed on the outer side of the housing member 11, that is, the first connection area 101 is disposed on the outer surface of the housing body 111, and the second connection area 102 is disposed on the side of the first cover 12 away from the housing member 11. The second connection area 102 is fully distributed on the surface of the first cover plate 12 away from the shell 11, so that the whole area of the first cover plate 12 is firmly connected with the battery box 300. And the roughness of the whole surface of the first cover plate 12 is consistent, so that the processing of the first cover plate 12 is facilitated, and the first cover plate 12 is prevented from being processed for a plurality of times. The first connecting area 101 is distributed on the outer side surface of the housing part 11, so that the outer surface of the housing part 11 is prevented from being processed and molded for a plurality of times.

In another possible embodiment of the present disclosure, the first connection region 101 may be a partial region on the outer side of the housing member 11, and the second connection region 102 may be a partial region on the side of the first cover plate 12 remote from the housing member 11. The first body region 103 is disposed on the side of the first connection region 101 of the housing member 11 away from the first cover plate 12, and the roughness of the first body region 103 is greater than or equal to the roughness of the first connection region 101.

The first cover plate 12 further includes a second body region 104, and the roughness of the second body region 104 is greater than or equal to the roughness of the second connection region 102. Preferably, the roughness of the second body region 104 is equal to the roughness of the second connection region 102.

The first connection area 101 is connected to the first body area 103, and the first connection area 101 is an annular area on the surface of the shell main body 111, where the annular area is disposed at one end of the surface of the shell main body 111 near the first cover plate 12, and other areas of the outer surface of the shell main body 111 are the first body area 103. The second connection region 102 is connected to the second body region 104, the second connection region 102 is a circular region on the surface of the first cover 12, and the second body region 104 is a circular region on the surface of the first cover 12.

In the embodiment of the present disclosure, the battery case 10 is made of stainless steel or an aluminum alloy or the like. The surface of the battery case 10 is generally smooth, and when the cylindrical batteries are grouped or form a battery pack, adjacent battery components among the plurality of batteries are filled with glue, and the connection between the batteries and the glue layer can be ensured to be tight by setting the roughness of the first main body area 103 to be equal to or greater than the roughness of the first connection area 101, so that the connection strength is improved. The roughness of the second body region 104 is equal to that of the second connection region 102, and the first cover plate 12 can be formed through one process, so that the production efficiency is improved and the cost is saved.

In the embodiment of the disclosure, the battery is described as a cylindrical battery, and in practical application, the battery is not limited to the cylindrical battery, and may be a prismatic battery. For example, the battery may be a hexagonal-prism battery, and in this case, the first cover plate 12 may be a hexagonal plate, and the case member 11 is a hollow hexagonal-prism structure.

The battery cell 20 is disposed in the battery case 10, and the battery cell 20 may include a battery cell main body, a first tab and a second tab, where the first tab and the second tab are respectively connected with the battery cell main body. The first tab is one of a positive tab and a negative tab of the battery, and the second tab is the other of the positive tab and the negative tab of the battery.

In one embodiment, the battery case 10 is a negative electrode of a battery, the post 30 is a positive electrode of the battery, the positive tab is connected to the post 30, and the negative tab is connected to the battery case 10. The positive tab and the post 30 may be directly connected (e.g., welded or riveted), or the positive tab and the post 30 may be indirectly connected (e.g., the positive tab and the post 30 may be connected by a current collecting plate). The negative electrode tab and the battery case 10 may be directly connected (e.g., welded or riveted), or the negative electrode tab and the battery case 10 may be indirectly connected (e.g., the negative electrode tab and the battery case 10 are connected through an adapter).

In one embodiment, the cells 20 are coiled cells, which are not only convenient to group, but also can be processed to provide longer length batteries. The battery cell 20 has a second pole piece with a first pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, and the first pole piece, the second pole piece opposite to the first pole piece and the diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

The battery provided by the embodiment of the disclosure comprises a battery shell 10, the battery shell 10 is provided with a first cover plate 12 and a shell piece 11, one end of the shell piece 11 is provided with an opening, the first cover plate 12 is connected to the opening of the shell piece 11, the outer surface of the shell piece 11 is provided with a first connecting area 101, the first connecting area 101 is positioned at one end of the shell piece 11, which is close to the first cover plate 12, one surface of the first cover plate 12, which is far away from the shell main body 111, is provided with a second connecting area 102, the second connecting area 102 is close to the edge of the first cover plate 12, the roughness of the second connecting area 102 is greater than the roughness of the first connecting area 101, the difference between the roughness of the second connecting area and the roughness of the first connecting area is greater than 0 and less than or equal to 6 mu m, and the problem of uneven welding caused by overlarge roughness difference between the first connecting area and the second connecting area is avoided, so that the stability of the battery shell connection is improved.

The exemplary embodiments of the present disclosure also provide a battery device, as shown in fig. 3, including the battery 100 described above. The battery comprises a battery shell 10, wherein the battery shell 10 comprises a first cover plate 12 and a shell piece 11, one end of the shell piece 11 is provided with an opening, the first cover plate 12 is connected with the opening of the shell piece 11, the outer surface of the shell piece 11 is provided with a first connecting area 101, the first connecting area 101 is positioned at one end of the shell piece 11, which is close to the first cover plate 12, one surface of the first cover plate 12, which is far away from the shell main body 111, is provided with a second connecting area 102, and the second connecting area 102 is close to the edge of the first cover plate 12; wherein the roughness of the second connection region 102 is greater than the roughness of the first connection region 101.

The battery device provided by the embodiment of the disclosure includes a battery, in which a battery case 10 has a first cover plate 12 and a case member 11, one end of the case member 11 is provided with an opening, the first cover plate 12 is connected to the opening of the case member 11, the outer surface of the case member 11 is provided with a first connection region 101, the first connection region 101 is located at one end of the case member 11 close to the first cover plate 12, one surface of the first cover plate 12 far away from a case main body 111 is provided with a second connection region 102, and the second connection region 102 is close to the edge of the first cover plate 12, the roughness of the second connection region 102 is greater than the roughness of the first connection region 101, the difference between the roughness of the second connection region 102 and the roughness of the first connection region 101 is greater than 0 and less than or equal to 6 μm, and the problem of uneven welding caused by overlarge roughness difference between the first connection region 101 and the second connection region 102 is avoided, thereby improving the stability of the connection of the battery case 10.

The battery device provided by the embodiment of the disclosure may be a battery module or a battery pack. When the battery device is a battery module, the battery module includes a plurality of batteries and a battery rack, and the plurality of batteries are mounted in the battery rack, for example, the plurality of batteries are distributed in an array on the battery rack.

The battery is provided with one end of the first cover plate 12 facing the battery frame, and a first glue layer 201 is arranged between the battery frame and the battery, and the first glue layer 201 is at least partially connected with the first cover plate 12. The roughness of the second connection region 102 is large, which is advantageous for the stability of the connection of the battery and the battery holder.

When the battery device is a battery pack, the battery device may include a plurality of batteries 100 and a case 300, and a receiving space is provided in the case 300, and the batteries are installed in the receiving space in the case 300. Of course, in practical applications, the battery may also be directly disposed in the case 300, for example, the battery is adhered to the case 300 by a connecting adhesive, which is not particularly limited in the embodiments of the disclosure. The battery 100 is disposed on the support plate of the case 300, and a first adhesive layer 201 is disposed between the support plate and the battery 100, and the first adhesive layer 201 is at least partially connected to the first cover plate 12. The support plate may be a bottom plate of the case, or the support plate may be a battery rack.

The case 300 has a bottom plate 310, the battery is disposed on the bottom plate 310, a first adhesive layer 201 is disposed between the battery 100 and the bottom plate 310, and one end of the battery, where the first cover 12 is disposed, faces the bottom plate 310, and the first adhesive layer 201 is at least partially connected to the second connection region 102.

When the battery 100 is connected to the bottom plate 310 through the battery frame, the first adhesive layer 201 is disposed between the battery frame and the first cover plate 12 of the battery. When the battery 100 is directly connected to the bottom plate 310, the first adhesive layer 201 is disposed between the bottom plate 310 and the first cover plate 12 of the battery. The terminal 30 of the battery may be disposed at an end of the housing member 11 away from the first cover plate 12, that is, the terminal 30 of the battery is disposed upward, and a bus bar is disposed at the top of the terminal 30, through which electrical connection of a plurality of batteries is achieved.

The battery device comprises a plurality of batteries 100, a second glue layer 202 is arranged between the plurality of batteries 100, and the second glue layer 202 is at least partially connected with the first body region 103. For example, the plurality of cells 100 may be distributed in an array, with gaps between the plurality of cells 100, and the second glue layer 202 fills in between the gaps of the cells. The second adhesive layer 202 is connected with the first body region 103, and the roughness of the first connection region 101 is less than or equal to the roughness of the first body region 103, so that the second adhesive layer 202 is connected with the first body region 103, and the connection strength between the batteries is improved.

In some possible embodiments, the batteries are distributed in multiple rows, a cold plate is arranged between two adjacent rows of batteries 100, a second adhesive layer 202 is arranged between the cold plate and the batteries 100, the second adhesive layer 202 is connected with the first main body area 103, so that the adhesive force between the batteries and the cold plate can be improved, and the connection stability of the battery device is improved.

The battery device provided by the embodiment of the disclosure includes a battery, in which a battery case 10 has a first cover plate 12 and a case member 11, one end of the case member 11 is provided with an opening, the first cover plate 12 is connected to the opening of the case member 11, the outer surface of the case member 11 is provided with a first connection region 101, the first connection region 101 is located at one end of the case member 11 close to the first cover plate 12, one surface of the first cover plate 12 far away from the case main body 111 is provided with a second connection region 102, and the second connection region 102 is close to the edge of the first cover plate 12, the roughness of the second connection region 102 is greater than the roughness of the first connection region 101, the difference between the roughness of the second connection region 102 and the roughness of the first connection region 101 is greater than 0 and less than or equal to 6 μm, the roughness difference between the roughness of the second connection region 102 and the first connection region 101 is greater than 0 and less than or equal to 6 μm, thereby the problem of uneven welding caused by excessively large difference between the roughness of the first connection region 101 and the second connection region 102 is avoided, and the stability of the battery case 10 is improved, and the roughness of the second connection region 102 is set to be greater than the roughness of the first connection region 101 and the first connection region 300 is greater than the roughness of the first connection region 300, and the stability of the battery case is improved when the battery case is adhered to the device.

The battery device provided by the embodiment of the disclosure can be applied to an electric vehicle, and when the battery is used for the electric vehicle, the battery device can be a battery pack, and the battery pack is installed on the electric vehicle and provides energy for the electric vehicle.

In practice, the battery pack may be mounted to the frame of an electric vehicle. The battery pack can be fixedly connected with the frame. Or the battery pack can be a modularized battery pack which can be detachably connected to the vehicle body, so that the battery pack is convenient to replace.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed 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.

Claims (11)

1. A battery, the battery comprising:

the battery shell comprises a first cover plate and a shell piece, at least one end of the shell piece is provided with an opening, the first cover plate is welded to the opening of the shell piece, a first connecting area is arranged on the outer side face of the shell piece and is positioned at one end, close to the first cover plate, of the shell piece, a second connecting area is arranged on the surface, far away from the shell piece, of the first cover plate, and is close to the edge of the first cover plate;

wherein at least the roughness of the second connection region in the first cover plate is greater than the roughness of the first connection region, and the difference between the roughness of the second connection region and the roughness of the first connection region is greater than 0 and less than or equal to 6 μm.

2. The battery of claim 1, wherein the thickness of the first cover plate is greater than the wall thickness of the housing member.

3. The battery of claim 1, wherein the first cover plate and the housing member are connected by laser welding, and wherein the penetration of the melt pool when the first cover plate and the housing member are welded is 0.2w or more, wherein w is the wall thickness of the housing member.

4. The battery of claim 3 wherein the penetration of the melt pool when the first cover plate and the housing member are welded is equal to the wall thickness of the housing member.

5. The battery of claim 1, wherein the housing member comprises:

the shell comprises a shell body, wherein openings are formed in two ends of the shell body, and the first cover plate is arranged at one end of the shell body;

the second cover plate is arranged at one end, far away from the first cover plate, of the shell main body, and the second cover plate and the shell main body are of an integrated structure.

6. The battery of claim 1, wherein a first body region is provided on the side of the housing member remote from the first cover plate, the first body region having a roughness greater than or equal to a roughness of the first connection region.

7. The battery of claim 1, wherein the first cover plate further comprises a second body region having a roughness that is consistent with or greater than a roughness of the second connection region.

8. The battery of any one of claims 1-7, wherein the battery is a cylindrical battery.

9. A battery device, characterized in that it comprises a battery according to any one of claims 1-8.

10. The battery device of claim 9, wherein the battery device further comprises:

the box, the box has the backup pad, the battery is located the backup pad, and the battery with be provided with first glue film between the backup pad, and the battery sets up the one end orientation of first apron the backup pad.

11. The battery device of claim 9, wherein the battery device comprises a plurality of cells with a second glue layer disposed therebetween, the second glue layer being at least partially connected to the first body region of the cells.

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