CN218957870U - Batteries and battery devices - 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

Batteries and battery devices

technical field

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

Background technique

With the development and progress of technology, the application of electric vehicles is becoming more and more extensive. The electric vehicles are often provided with battery devices, which are used to provide power for the electric vehicles. The battery device is provided with a battery, and the battery includes a battery casing and a battery cell. The battery casing is provided with a storage space, and the battery cell is arranged in the storage space, and the battery cell and other devices are protected by the battery casing. The battery case may include a case part and a cover plate, and the case part and the cover plate are welded. In the related art, the welding between the case part and the cover plate is prone to failure.

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

Contents of the invention

The purpose of the present disclosure is to provide a battery and a battery device, thereby improving the stability of the connection of the battery casing at least to a certain extent.

According to one aspect of the present disclosure, a battery is provided, wherein the battery includes:

A battery case, the battery case includes a first cover plate and a case part, at least one end of the case part has an opening, the first cover plate is welded to the opening of the case part, and the case part The outer surface of the part is provided with a first connection area, the first connection area is located at the end of the shell part close to the first cover, and the side of the first cover away from the shell body is provided with a second a connection area, and the second connection area is close to the edge of the first cover plate;

Wherein, the roughness of at least the second connection area in the first cover plate is greater than the roughness of the first connection area, and the roughness of the second connection area is the same as the roughness of the first connection area The difference is greater than 0 and less than or equal to 6 μm.

The battery provided by the embodiment of the present disclosure includes a battery case, the battery case has a first cover plate and a case part, an opening is provided at one end of the case part, the first cover plate is connected to the opening of the case part, and the case part The outer surface of the outer surface is provided with a first connection area, the first connection area is located at one end of the shell member close to the first cover plate, and a second connection area is provided on the side of the first cover plate away from the shell body, and the second connection area is close to the first On the edge of the cover plate, the roughness of the second connection area is greater than the roughness of the first connection area, and the difference between the roughness of the second connection area and the roughness of the first connection area is greater than 0 and less than or equal to 6 μm, through the second connection The difference between the roughness of the first connection region and the roughness of the first connection region is greater than 0 and less than or equal to 6 μm, which avoids the problem of uneven welding caused by the large difference between the roughness of the first connection region and the second connection region, thereby improving the quality of the battery. Stability of the housing connection.

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

The battery device provided by the embodiment of the present disclosure includes a battery. In the battery, the battery case has a first cover plate and a case part. An opening is provided at one end of the case part. The first cover plate is connected to the opening of the case part. The outer surface of the part is provided with a first connection area, the first connection area is located at the end of the shell part close to the first cover plate, the side of the first cover plate away from the shell main body is provided with a second connection area, and the second connection area is close to the first cover plate On the edge of a cover plate, the roughness of the second connection area is greater than the roughness of the first connection area, and the difference between the roughness of the second connection area and the roughness of the first connection area is greater than 0 and less than or equal to 6 μm, through the second The difference between the roughness of the connection area and the roughness of the first connection area is greater than 0 and less than or equal to 6 μm, which avoids the problem of uneven welding caused by excessive roughness differences between the first connection area and the second connection area, thereby improving The stability of the battery case connection.

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 present disclosure.

Description of 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. Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a battery provided by an exemplary embodiment of the present disclosure;

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

Fig. 3 is a schematic structural diagram of a battery device provided by an exemplary embodiment of the present disclosure.

Detailed ways

The following will clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only, and are not intended to limit the protection scope of the present disclosure, so it should be understood that various modifications can be made to the exemplary embodiments without departing from the protection scope of the present disclosure. modifications and changes.

In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "plurality" is means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" or "an" are likewise intended to mean one of a possible plurality of such objects.

Unless otherwise specified or explained, the terms "connected" and "fixed" should be interpreted in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or integral connection, or electrical connection, or Connection; "connection" can be a direct connection or an indirect connection through an intermediary. Those skilled in the art can understand the specific meanings of the above terms in the present disclosure according to specific situations.

Furthermore, in the description of the present disclosure, it should be understood that the orientation words such as "upper", "lower", "inner" and "outer" described in the exemplary embodiments of the present disclosure are based on the angles shown in the drawings It should not be construed as limiting the example embodiments of the present disclosure. It also needs to be understood that in this context, when an element or feature is referred to as being "on," "under," or "inside" or "outside" another element(s), it is not only a direct connection In other (one or more) elements "on", "under" or "inside", "outside", it can also be indirectly connected to another (one or more) elements "on", "under" or "outside" through intermediate elements inside and outside".

The exemplary embodiment of the present disclosure firstly provides a battery 100. As shown in FIG. There is an opening, the first cover plate 12 is welded to the opening of the shell member 11, and the outer surface of the shell member 11 is provided with a first connecting area 101, and the first connecting area 101 is located at one end of the shell member 11 close to the first cover plate 12 , the side of the first cover plate 12 away from the shell body 111 is provided with a second connection area 102, and the second connection area 102 is close to the edge of the first cover plate 12; wherein, the roughness of the second connection area 102 is greater than that of the first connection area The roughness of 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 battery provided by the embodiment of the present disclosure includes a battery case 10, the battery case 10 has a first cover plate 12 and a case part 11, an opening is provided at one end of the case part 11, and the first cover plate 12 is connected to the case part 11, the outer surface of the housing part 11 is provided with a first connecting area 101, the first connecting area 101 is located at the end of the housing part 11 close to the first cover plate 12, and the first cover plate 12 is set on the side away from the shell main body 111 There is a second connection area 102, and the second connection area 102 is close to the edge of the first cover plate 12, the roughness of the second connection area 102 is greater than the roughness of the first connection area 101, and the roughness of the second connection area 102 and the first The roughness difference of the first connection region 101 is greater than 0 and less than or equal to 6 μm, 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, avoiding the first connection region 101 The problem of uneven welding caused by excessive roughness difference with the second connection area 102, thereby improving the stability of the connection of the battery case 10, and setting the roughness of the second connection area 102 to be greater than that of the first connection area 101 roughness, so that when the battery is bonded in the box body 300, the bonding strength between the first cover plate 12 and the box body 300 is improved, thereby improving the connection stability of the battery device.

Each part of the battery provided by the embodiments of the present disclosure will be described in detail below:

As shown in Figure 2, the battery can include a battery case 10, a cell 20 and a pole 30, the cell 20 is arranged inside the battery case 10, the pole 30 is arranged in the battery case 10, and the pole 30 and the cell 20 electrical connections. In the embodiment of the present disclosure, the battery case 10 and the pole 30 may be two electrodes of the battery respectively, and the battery cell 20 is electrically connected to the battery case 10 and the pole 30 respectively.

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

When the battery 100 is installed in the box body 300 , the battery is often directly or indirectly bonded to the bottom plate 310 of the box body 300 . When the battery is bonded, the first cover plate 12 faces the bottom plate 310 of the box body 300, and a connecting glue is provided between the bottom plate 310 and the first cover plate 12. By increasing the roughness of the first cover plate 12, the bonding of the battery and the bottom plate 310 can be improved. stability.

Wherein, the shell member 11 includes a shell main body 111 and a second cover plate 112, openings are arranged at both ends of the shell main body 111, the first cover plate 12 is arranged on one end of the shell main body 111; the second cover plate 112 is arranged on the shell main body 111 At an end away from the first cover 12 , the second cover 112 and the shell main body 111 are integrally formed. For example, the second cover plate 112 and the shell main body 111 may be integrally formed by stretching.

The connection mode of the first cover plate 12 and the housing part 11 can be welding, for example, the connection mode of the first cover plate 12 and the housing part 11 can be laser welding, and the first connection area 101 and the second connection area The preset roughness of 102 can improve the welding quality, thereby improving the tightness and connection strength between the first cover plate 12 and the shell part 11 .

Further, in order to improve the welding quality of the first cover plate 12 and the shell part 11 , the difference between the roughness of the second connection area 102 and the roughness of the first connection area 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, then 0<b−a≦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, which avoids the roughness caused by the excessive roughness difference between the first connection region 101 and the second connection region 102 When the same laser beam is used for welding, the difference in reflection between the first connection area 101 and the second connection area 102 causes a large difference in the welding effect on both sides, thereby improving the welding quality.

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 size of the first cover plate 12 in the direction of the battery axis, that is, the distance 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 part 11 size. The wall thickness of the shell part 11 refers to the wall thickness of the shell body 111 , that is, the difference between the radius of the outer surface of the shell body 111 and the radius of the inner surface of the shell body 111 . The thickness of the first cover plate 12 is greater than the wall thickness of the shell part 11 , which can improve the supporting effect of the first cover plate 12 and the connection strength between the first cover plate 12 and the shell part 11 .

During the use of the battery, the battery cells will generate gas in the battery case 10 , forming high-pressure gas that impacts the first cover plate 12 . The thickness of the first cover plate 12 is greater than that of the case member 11 to ensure the impact resistance of the battery case 10 . When the difference in roughness between the first cover plate 12 and the shell member 11 is relatively large, the difference in the degree of light reflection between the first cover plate 12 and the shell member 11 is relatively large, and the first cover plate is relatively thick, which may easily cause the first cover The plate 12 is poorly welded to the shell part 11 , which further leads to failure of the seal between the first cover plate 12 and the shell part 11 . Therefore, in the disclosed embodiment, 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, which can avoid poor welding and improve connection stability.

Wherein, the explosion-proof valve may be a thinned area on the first cover plate 12, for example, an annular thinned area is set on the first cover plate 12, and the area surrounded by the annular thinned area is an explosion-proof area. The strength of the thinned area is smaller than that of the surrounding area, and the weak area is broken by the battery when the battery is thermally runaway. The thickness of the first cover plate 12 is greater than the wall thickness of the shell member 11 , which can avoid the influence of the use of the first cover plate 12 after processing the explosion-proof valve because the strength is too low.

The first cover plate 12 and the shell part 11 are connected by laser welding, and the penetration depth of the molten pool is greater than or equal to 0.2w when the first cover plate 12 and the shell part 11 are welded, where w is the wall thickness of the shell part. When the first cover plate 12 and the shell part 11 are welded, the penetration depth of the molten pool is greater than or equal to 0.2w, which can ensure the welding reliability of the first cover plate 12 and the shell part 11, and ensure that the shell part 11 and the first cover plate 12 sealing performance.

Optionally, when the first cover plate 12 and the shell part 11 are welded, the penetration depth of the molten pool is equal to the wall thickness of the shell part 11 . When the first cover plate 12 and the shell part 11 are welded, the penetration depth of the molten pool is equal to the wall thickness of the shell part 11, which can improve the welding effect of the first cover plate 12 and the shell part 11, and ensure that the first cover plate 12 And the sealing performance of the housing part 11.

Exemplarily, the battery provided in the embodiment of the present disclosure is a cylindrical battery, on this basis, the battery case 10 is a hollow columnar structure. The first cover plate 12 is a disc structure, and the shell member 11 is a hollow cylindrical structure with one end open. The housing part 11 includes a housing main body 111 and a second cover plate 112 , the second cover plate 112 is in the form of a disc, and the housing main body 111 is in the form of a cylinder.

In a feasible implementation manner of the present disclosure, the first connection area 101 covers the outer surface of the shell member 11, that is, the first connection area 101 covers the outer surface of the shell body 111, and the second connection area 102 covers the second A cover plate 12 is located away from the side of the housing part 11 . By covering the second connection area 102 on the side of the first cover plate 12 far away from the housing part 11 , the entire area of the first cover plate 12 is firmly connected to the battery case 300 . Moreover, the uniform roughness of the entire surface of the first cover plate 12 is beneficial to the processing of the first cover plate 12 and avoids the need for multiple processing of the first cover plate 12 . The first connecting area 101 covers the outer surface of the shell member 11 , avoiding the need for multiple processing and shaping of the outer surface of the shell member 11 .

In another feasible implementation manner of the present disclosure, the first connection area 101 may be a partial area on the outer surface of the shell member 11, and the second connection area 102 is a part on the side of the first cover plate 12 away from the shell member 11. area. For example, a first body region 103 is provided on the side of the first connection region 101 away from the first cover plate 12 on the shell member 11 , 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 , 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 .

Wherein, the first connecting area 101 and the first main body area 103 are in contact, and the first connecting area 101 is an annular area on the surface of the shell body 111, and the annular area is set at one end of the shell body 111 surface close to the first cover plate 12, The other area on the outer surface of the shell main body 111 is the first main body area 103 . The second connection area 102 is in contact with the second body area 104 , the second connection area 102 is a ring area on the surface of the first cover 12 , and the second body area 104 is a circular area on the surface of the first cover 12 .

In the embodiment of the present disclosure, the battery case 10 is made of materials such as stainless steel or aluminum alloy. The surface of the battery case 10 is usually relatively smooth. When cylindrical batteries are grouped or formed into a battery pack, the adjacent battery components in multiple batteries are filled with glue. By setting the roughness of the first main body area 103 to be greater than or equal to the first connection area The roughness of 101 can ensure the tight connection between the battery and the adhesive layer and improve the connection strength. The roughness of the second body region 104 is equal to the roughness of the second connection region 102 , and the first cover plate 12 can be formed in one process to improve production efficiency and save costs.

It should be noted that, in the embodiments of the present disclosure, the battery is described as a cylindrical battery. In practical applications, the battery is not limited to a cylindrical battery, and the battery may also be a prismatic battery. For example, the battery may be a hexagonal prism battery. In this case, the first cover plate 12 may be a hexagonal plate, and the housing part 11 may be 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, and the first tab and the second tab are respectively connected to the main body of the battery cell. The first tab is one of the positive tab and the 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 the negative pole of the battery, the pole 30 is the positive pole of the battery, the positive tab is connected to the pole 30 , and the negative tab is connected to the battery case 10 . The positive tab and the pole 30 may be directly connected (for example, welded or riveted), or the positive tab and the pole 30 may be connected indirectly (for example, the positive tab and the pole 30 may be connected through a current collector). The negative tab and the battery case 10 can be directly connected (for example, welded or riveted), or the negative tab and the battery case 10 can be connected indirectly (for example, the negative tab and the battery case 10 are connected through an adapter).

In one embodiment, the battery cell 20 is a winding battery cell, which is not only convenient for grouping, but also can be processed to obtain a battery with a longer length. The electric core 20 has a first pole piece and a second pole piece electrically opposite to the first pole piece, and a diaphragm piece arranged between the first pole piece and the second pole piece, and connects the first pole piece and the first pole piece to each other. The second pole piece with opposite electrical properties and the diaphragm piece arranged between the first pole piece and the second pole piece are wound to obtain a wound electric core.

The battery provided by the embodiment of the present disclosure includes a battery case 10, the battery case 10 has a first cover plate 12 and a case part 11, an opening is provided at one end of the case part 11, and the first cover plate 12 is connected to the case part 11, the outer surface of the housing part 11 is provided with a first connecting area 101, the first connecting area 101 is located at the end of the housing part 11 close to the first cover plate 12, and the first cover plate 12 is set on the side away from the shell main body 111 There is a second connection area 102, and the second connection area 102 is close to the edge of the first cover plate 12, the roughness of the second connection area 102 is greater than the roughness of the first connection area 101, and the roughness of the second connection area is the same as that of the first cover plate 12. The roughness difference of a connection area is greater than 0 and less than or equal to 6 μm, and the difference between the roughness of the second connection area and the roughness of the first connection area is greater than 0 and less than or equal to 6 μm, avoiding the first connection area and the second connection The problem of uneven welding caused by the large difference in the roughness of the area, thereby improving the stability of the battery case connection.

Exemplary embodiments of the present disclosure also provide a battery device. As shown in FIG. 3 , the battery device includes the above-mentioned battery 100 . Wherein, the battery includes a battery casing 10, the battery casing 10 includes a first cover plate 12 and a casing part 11, one end of the casing part 11 has an opening, the first cover plate 12 is connected to the opening of the casing part 11, and the casing The outer surface of the part 11 is provided with a first connection area 101, the first connection area 101 is located at the end of the shell part 11 close to the first cover plate 12, and the side of the first cover plate 12 away from the shell main body 111 is provided with a second connection area 102 , and the second connection area 102 is close to the edge of the first cover plate 12 ; wherein, the roughness of the second connection area 102 is greater than the roughness of the first connection area 101 .

The battery device provided by the embodiment of the present disclosure includes a battery. In the battery, the battery case 10 has a first cover plate 12 and a case part 11. An opening is provided at one end of the case part 11. The first cover plate 12 is connected to the case part. 11, the outer surface of the housing part 11 is provided with a first connecting area 101, the first connecting area 101 is located at the end of the housing part 11 close to the first cover plate 12, and the first cover plate 12 is set on the side away from the shell main body 111 There is a second connection area 102, and the second connection area 102 is close to the edge of the first cover plate 12, the roughness of the second connection area 102 is greater than the roughness of the first connection area 101, and the roughness of the second connection area 102 and the first The roughness difference of the first connection region 101 is greater than 0 and less than or equal to 6 μm, 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, avoiding the first connection region 101 The problem of uneven welding caused by excessive roughness difference with the second connection area 102 improves the stability of the connection of the battery case 10 .

The battery device provided in the embodiments of the present 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 installed in the battery rack, for example, the plurality of batteries are distributed in an array on the battery rack.

One end of the battery is provided with the first cover plate 12 facing the battery frame, and a first adhesive layer 201 is provided between the battery frame and the battery, the first adhesive layer 201 is at least partially connected to the first cover plate 12 . The roughness of the second connection area 102 is relatively large, which is beneficial to the stability of the connection between the battery and the battery rack.

When the battery device is a battery pack, the battery device may include a plurality of batteries 100 and a box body 300 , the box body 300 is provided with an accommodating space, and the batteries and the batteries are erected in the accommodating space in the box body 300 . Of course, in practical applications, the battery may also be directly arranged in the box body 300 , for example, the battery is bonded to the box body 300 by connecting glue, which is not specifically limited in this embodiment of the present disclosure. The battery 100 is disposed on the support plate of the box body 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 can be the bottom plate of the box body, or the support plate can also be a battery rack.

The box body 300 has a bottom plate 310, the battery is arranged on the bottom plate 310, and a first adhesive layer 201 is arranged between the battery 100 and the bottom plate 310, and one end of the first cover plate 12 of the battery is set toward the bottom plate 310, and the first adhesive layer 201 is at least partially It is connected with the second connection area 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 pole 30 in the battery can be set at the end of the shell member 11 away from the first cover plate 12, that is, the pole 30 of the battery is set upward, and a bus bar is arranged on the top of the pole 30, and multiple Electrical connection of the battery.

The battery device includes a plurality of batteries 100 , and a second adhesive layer 202 is disposed between the plurality of batteries 100 , and the second adhesive layer 202 is at least partially connected to the first body region 103 . For example, a plurality of batteries 100 may be distributed in an array, there are gaps between the plurality of batteries 100, and the second adhesive layer 202 is filled in the gaps between the batteries. The second adhesive layer 202 is connected to the first main body region 103, and the roughness of the first connection region 101 is less than or equal to the roughness of the first main body region 103, so the second adhesive layer 202 is connected to the first main body region 103, which improves the battery life. the connection strength between them.

Wherein, in some feasible implementation manners, 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 battery 100, and the second adhesive layer 202 and The connection of the first main body area 103 can improve the adhesive force between the battery and the cold plate, and improve the stability of the connection of the battery device.

The battery device provided by the embodiment of the present disclosure includes a battery. In the battery, the battery case 10 has a first cover plate 12 and a case part 11. An opening is provided at one end of the case part 11. The first cover plate 12 is connected to the case part. 11, the outer surface of the housing part 11 is provided with a first connecting area 101, the first connecting area 101 is located at the end of the housing part 11 close to the first cover plate 12, and the first cover plate 12 is set on the side away from the shell main body 111 There is a second connection area 102, and the second connection area 102 is close to the edge of the first cover plate 12, the roughness of the second connection area 102 is greater than the roughness of the first connection area 101, and the roughness of the second connection area 102 and the first The roughness difference of the first connection region 101 is greater than 0 and less than or equal to 6 μm, 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, avoiding the first connection region 101 The problem of uneven welding caused by excessive roughness difference with the second connection area 102, thereby improving the stability of the connection of the battery case 10, and setting the roughness of the second connection area 102 to be greater than that of the first connection area 101 roughness, so that when the battery is bonded in the box body 300, the bonding strength between the first cover plate 12 and the box body 300 is improved, thereby improving the connection stability of the battery device.

The battery device provided by the embodiments of the present disclosure can be applied to an electric vehicle. When the battery is used in an electric vehicle, the battery device can be a battery pack installed on the electric vehicle to provide energy for the electric vehicle.

In practical application, the battery pack can be mounted on the frame of the electric vehicle. The battery pack can be fixedly connected to the frame. Alternatively, the battery pack may be a modular battery pack, which can be detachably connected to the vehicle body for easy replacement.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure indicated by the appended 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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