CN219457873U

CN219457873U - Battery cell

Info

Publication number: CN219457873U
Application number: CN202320434268.0U
Authority: CN
Inventors: 卫志达; 谢继春
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-08-01
Anticipated expiration: 2033-03-09

Abstract

The application provides a battery, which comprises a shell, a battery cell and a top cover, wherein the shell is provided with an opening, the top cover is covered on the opening to form a cavity together with the shell, the battery cell is arranged in the cavity, and the edge of the opening is provided with a folded edge extending to the outer side of the opening; the edge of top cap has first bending section and first connecting section from inside to outside in proper order, and first connecting section and hem laminating are connected, and first bending section is buckled to the cavity inboard. The battery of the application can improve the energy density of the battery.

Description

Battery cell

Technical Field

The application belongs to the field of batteries, and particularly relates to a battery.

Background

At present, electronic devices are widely applied to daily life, and as the use frequency of the electronic devices is higher and higher, the power consumption is larger and larger, the volume is lighter and thinner, and the battery is used as a core part of the electronic devices, so that the performance of the electronic devices is directly determined.

The existing battery consists of a battery core, a pole, a shell and a top cover, wherein a battery core body of the battery core is connected with the pole of the battery through a pole lug of the battery core. Specifically, the shell and the top cover serve as the external structure of the battery, play a role in protecting the internal battery core from being damaged, and the battery core is arranged in a cavity surrounded by the shell and the top cover and is connected with the lug of the battery core and external electronic equipment through the pole, so that the electronic equipment is powered.

However, because a larger gap exists between the outer side of the contact between the top cover and the outer shell, the contact part between the top cover and the outer shell is oversized, so that larger space of the battery is occupied, the space occupied by the battery core inside the battery is smaller, and the energy density of the battery is lost.

Disclosure of Invention

To the not enough of prior art, this application provides a battery, can promote the energy density of battery.

The application provides a battery, which comprises a shell, a battery cell and a top cover, wherein the shell is provided with an opening, the top cover is covered on the opening to form a cavity together with the shell, the battery cell is arranged in the cavity, and the edge of the opening is provided with a folded edge extending to the outer side of the opening; the edge of top cap has first bending section and first connecting section from inside to outside in proper order, and first connecting section and hem laminating are connected, and first bending section is buckled to the cavity inboard.

Optionally, the hem includes second bending section and second linkage segment, and the second bending section is connected between the chamber wall of cavity and second linkage segment, and second linkage segment and first linkage segment laminating are connected.

Optionally, the first bending section and the second bending section are arc sections, and the first bending section and the second bending section are at least partially attached.

Optionally, the central area of the top cover forms a groove, the groove is connected to the first bending section, and the groove is recessed in the first bending section.

Optionally, the projection of the groove in the thickness direction is not coincident with the projection of the cell.

Optionally, the second bending section is provided with a first surface and a second surface, the first surface is close to the first bending section, and the second surface is far away from the first bending section; the first bending section is provided with a third surface and a fourth surface, the third surface is close to the second bending section, and the fourth surface is far away from the second bending section; the first surface and the third surface are mutually attached.

Optionally, the bending radius corresponding to the first surface is equal to the sum of the bending radius corresponding to the second surface and the thickness of the housing.

Optionally, the bending radius corresponding to the second surface is 0.05-0.3mm; and/or the thickness of the housing is 0.05-0.3mm.

Optionally, the bending radius corresponding to the third surface is equal to the bending radius corresponding to the first surface.

Optionally, the bending radius corresponding to the fourth surface is equal to the sum of the bending radius corresponding to the third surface and the thickness of the top cover.

Optionally, the top cover and the housing are welded together, and the welded area does not exceed the inner side wall of the housing.

Optionally, the top cover further comprises a cover plate part, the cover plate part covers the central area of the top cover, a concave part is arranged between the cover plate part and the first bending section, and the cover plate part and the first connecting section are the same in height from the battery cell.

Optionally, the depth of the recess is greater than 0.5mm and the width of the recess is less than 0.6mm.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, it being obvious that the drawings in the following description are some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.

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

fig. 2 is a cross-sectional view of the battery of fig. 1;

FIG. 3 is an enlarged partial schematic view of FIG. 2A;

FIG. 4 is a cross-sectional view of another embodiment of a battery provided in an example of the present application;

FIG. 5 is an enlarged partial schematic view of FIG. 4 at A;

fig. 6 is an exploded view of the battery of fig. 1.

Reference numerals illustrate:

100-cell;

110-a housing;

120-cell;

130-top cap;

140-pole;

150-a negative electrode reinforcing sheet;

160-a transfer block;

111-opening;

112-flanging;

113-a second bending section;

114-a second connection section;

1131-a first surface;

1132-a second surface;

131-a first bending section;

132—a first connection section;

133-groove;

134-cover plate part;

135-depressions;

1311-a third surface;

1312-fourth surfaces;

161-a first transfer block;

162-second transfer block.

Detailed Description

In order to make the above objects, features and advantages of the embodiments of the present application more comprehensible, the following description will make the technical solutions of the embodiments of the present application clear and complete with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the purview of one of ordinary skill in the art without the exercise of inventive faculty.

In order to solve the above problems, the present application provides a battery including a case, a battery cell, and a top cover. The first connecting section at top cap edge is laminated with the second connecting section at shell edge and is connected, and the first bending section at top cap edge is laminated with the second bending section at shell edge part, realizes the connection of top cap and shell. Because the connection of the first bending section and the second bending section occupies the positions of the top cover and the edge of the shell, the first connecting section and the second connecting section occupy less space, so that the battery cell occupies larger space on the inner sides of the first bending section and the second bending section, and the energy density of the battery is improved.

The details of the present application will now be further described with reference to the accompanying drawings and detailed description.

The existing battery consists of a battery core, a pole, a shell and a top cover, wherein a battery core body of the battery core is connected with the pole of the battery through a pole lug of the battery core. Specifically, the shell and the top cover serve as the external structure of the battery, play a role in protecting the internal battery core from being damaged, and the battery core is arranged in a cavity surrounded by the shell and the top cover and is connected with the lug of the battery core and external electronic equipment through the pole, so that the electronic equipment is powered. However, because a larger gap exists between the outer side of the contact between the top cover and the outer shell, the contact part between the top cover and the outer shell is oversized, so that larger space of the battery is occupied, the space occupied by the battery core inside the battery is smaller, and the energy density of the battery is lost.

The battery provided by the application comprises a shell, an electric core and a top cover. The battery cell sets up in the cavity that shell and top cap enclose, and the edge of top cap has first section of buckling and first linkage segment from inside to outside in proper order, and the edge of shell has second section of buckling and second linkage segment that extends to the outside, and first linkage segment and second linkage segment laminating are connected, and first section of buckling and second section part laminating of buckling can make the battery cell occupy bigger space in first section of buckling and second section inboard of buckling to promote the energy density of battery.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application. Fig. 2 is a cross-sectional view of the battery of fig. 1. As shown in fig. 1 and 2, battery 100 includes a housing 110, a cell 120, and a top cover 130. The case 110 and the top cover 130 serve as an external structure of the battery 100 for fixedly placing the internal battery cells 120 on the one hand and protecting the internal battery cells 120 from the outside on the other hand. The battery cell 120 serves as a core power supply unit of the battery 100, and is used for supplying power to the battery 100 and further supplying power to external electronic devices.

Wherein the housing 110 has an opening 111. Fig. 3 is an enlarged partial schematic view at a in fig. 2. As shown in fig. 3, the top cover 130 is covered on the opening 111 to form a cavity together with the housing 110, the battery cell 120 is arranged in the cavity, the edge of the opening 111 is provided with a folded edge 112 extending to the outside of the opening 111, and the edge of the opening 111 of the housing 110 is provided with a folded edge 112 extending to the outside of the opening 111 so as to seal the folded edge 112 and the top cover 130, thereby facilitating the processing of the housing 110 and the top cover 130.

Further, the edge of the top cover 130 sequentially has a first bending section 131 and a first connecting section 132 from inside to outside, the first connecting section 132 is attached to the folded edge 112, and the first bending section 131 bends towards the inner side of the cavity, so that the central area of the top cover 130 is located at one side of the opening 111 facing the inner side of the cavity.

Specifically, when the first connecting section 132 of the top cover 130 is directly attached to the folded edge 112, the first connecting section 132 can only be attached to the folded edge 112 parallel to the first connecting section 132, and the folded edge 112 cannot be connected to the first connecting section 132, so that under the condition of meeting the connection strength between the first connecting section 132 and the folded edge 112, a large amount of space of the first connecting section 132 is occupied, and the space occupied by the battery cell 120 inside the first connecting section 132 is reduced.

Because the first connecting section 132 is attached to the flange 112, the first bending section 131 bends towards the inner side of the cavity, and the first bending section 131 of the top cover 130 can be connected with the inner side of the flange 112 while the first connecting section 132 of the top cover 130 is connected with the outer side of the flange 112, so that the connecting strength of the top cover 130 and the outer shell 110 is realized by the joint of the first connecting section 132 and the outer side of the flange 112 and the joint of the first bending section 131 and the inner side of the flange 112. Under the condition of ensuring the edge connection strength of the casing 110 and the top cover 130, since the inner side connection of the first bending section 131 and the folded edge 112 occupies a certain space, the space occupied by the first connecting section 132 of the top cover 130 is reduced, and the space occupied by the battery cell 120 at the inner side of the first bending section 131 is further increased, so that the energy density of the battery 100 is finally increased.

Optionally, the flange 112 includes a second bending section 113 and a second connecting section 114, where the second bending section 113 is connected between the cavity wall of the cavity and the second connecting section 114, and the second connecting section 114 is in fit connection with the first connecting section 132. Specifically, since the flange 112 includes the second bending section 113 and the second connecting section 114, the second bending section 113 is connected between the cavity wall of the cavity and the second connecting section 114, the second connecting section 114 is connected with the first connecting section 132 in a fitting manner, and under the combined action that the first connecting section 132 is connected with the second connecting section 114 and the first bending section 131 is connected with the second bending section 113, the edge connection between the housing 110 and the top cover 130 can be made tight.

Since the connection of the first bending section 131 and the second bending section 113 occupies a certain position of the edges of the case 110 and the top cover 130, the connection area between the edges of the top cover 130 and the case 110 is kept unchanged, so that fewer positions are occupied between the first connecting section 132 and the second connecting section 114, and the battery cell 120 occupies a larger space inside the first bending section 131 and the second bending section 113, thereby improving the energy density of the battery 100.

Optionally, the first bending section 131 and the second bending section 113 are arc sections, and the first bending section 131 and the second bending section 113 are at least partially attached. Specifically, since the first bending section 131 and the second bending section 113 are arc sections, the transition between the first bending section 131 and the second bending section 113 is more gentle, on one hand, the respective structures of the casing 110 and the top cover 130 are not easy to break at the bending position, and on the other hand, the first bending section 131 and the second bending section 113 are more tightly attached to each other, so that the first bending section 131 and the second bending section 113 are prevented from loosening, and the normal operation of the battery 100 is affected.

Optionally, a groove 133 is formed in a central area of the top cover 130, the groove 133 is connected to the first bending section 131, and the groove 133 is recessed in the first bending section 131. Specifically, since the central area of the top cover 130 forms the groove 133, the groove 133 is connected to the first bending section 131, and the groove 133 is recessed in the first bending section 131, the bending transition of the first bending section 131 can be gentle through the groove 133, so that the connection between the housing 110 and the top cover 130 is tight.

Optionally, the depth of the groove 133 is greater than 0.5mm. Specifically, since the groove 133 is formed in the central area of the top cover 130, the depth of the groove 133 is greater than 0.5mm, so that the situation that the first bending section 131 is broken due to severe bending of the first bending section 131 when the depth of the recess is too small is avoided, and the depth of the groove 133 is greater than 0.5mm, the connecting area between the first bending section 131 and the second bending section 113 is larger, and the connection between the housing 110 and the top cover 130 is tighter.

Optionally, the projection of the groove 133 in the thickness direction does not coincide with the projection of the cell 120. Specifically, since the projection of the groove 133 in the thickness direction is not coincident with the projection of the battery cell 120, the groove 133 and the battery cell 120 can be prevented from contacting each other, and further, the top cover 130 and the battery cell 120 are prevented from contacting each other, thereby preventing the top cover 130 and the battery cell 120 from being short-circuited and affecting the use of the battery 100.

As an alternative embodiment, the second bending section 113 is provided with a first surface 1131 and a second surface 1132, the first surface 1131 being close to the first bending section 131, the second surface 1132 being distant from the first bending section 131; the first bending section 131 is provided with a third surface 1311 and a fourth surface 1312, the third surface 1311 is close to the second bending section 113, and the fourth surface 1312 is far away from the second bending section 113; the first surface 1131 and the third surface 1311 are attached to each other.

Specifically, since the first surface 1131 of the second bending section 113 is close to the first bending section 131, and the third surface 1311 of the first bending section 131 is close to the second bending section 113, the first surface 1131 and the third surface 1311 are attached to each other, so that the first bending section 131 and the second bending section 113 can be tightly connected, and thus, the case 110 and the top cover 130 can be tightly connected, and the compactness of the overall structure of the battery 100 is ensured, so that the battery 100 can work normally.

Optionally, the bending radius corresponding to the first surface 1131 is equal to the sum of the bending radius corresponding to the second surface 1132 and the thickness of the housing 110. Specifically, the second bending section 113 has a suitable thickness because the bending radius corresponding to the first surface 1131 is equal to the sum of the bending radius corresponding to the second surface 1132 and the thickness of the housing 110.

Optionally, the second surface 1132 corresponds to a bending radius of 0.05-0.3mm. Specifically, since the bending radius corresponding to the second surface 1132 is 0.05-0.3mm, the bending radius corresponding to the second surface 1132 is not too small to affect the bending effect of the second bending section 113, and meanwhile, the bending radius corresponding to the second surface 1132 is not too large to occupy too large space, thereby reducing the energy density of the battery 100.

Optionally, the thickness of the housing 110 is 0.05-0.3mm. Specifically, the thickness of the casing 110 is 0.05-0.3mm, so that the thickness of the casing 110 is not too small to affect the protection of the casing 110 on the battery cell 120, and meanwhile, the thickness of the casing 110 is not too large to cause cost waste.

As an alternative embodiment, the third surface 1311 corresponds to a bend radius equal to the bend radius of the first surface 1131. Specifically, since the bending radius corresponding to the third surface 1311 is equal to the bending radius corresponding to the first surface 1131, the first surface 1131 and the third surface 1311 can be bonded more tightly, so that the first bending section 131 and the second bending section 113 are connected more tightly, and finally, the housing 110 and the top cover 130 are connected tightly.

Optionally, the bending radius corresponding to the fourth surface 1312 is equal to the sum of the bending radius corresponding to the third surface 1311 and the thickness of the top cover 130. Specifically, the bending radius corresponding to the fourth surface 1312 is equal to the sum of the bending radius corresponding to the third surface 1311 and the thickness of the top cover 130, so that the first bending section 131 has a suitable thickness.

Optionally, the top cover 130 is welded to the housing 110, and the welded area does not exceed the inner sidewall of the housing 110. Specifically, because the welding connection between the top cover 130 and the housing 110 can make the connection between the top cover 130 and the housing 110 more compact, and the welding area does not exceed the inner side wall of the housing 110, the processing cost of the welding process can be saved under the condition of ensuring that the top cover 130 and the housing 110 are firmly welded, and the condition that the battery 100 is short-circuited due to the fact that the redundant welding area contacts other structures is avoided.

As an alternative embodiment, the top cover 130 further includes a cover plate portion 134. Fig. 4 is a cross-sectional view of another embodiment of a battery provided in an example of the present application. Fig. 5 is an enlarged partial schematic view at a in fig. 4. As shown in fig. 4 and 5, the cover plate portion 134 covers the central region of the top cover 130, a recess portion 135 is provided between the cover plate portion 134 and the first bending section 131, and the cover plate portion 134 and the first connecting section 132 are the same in height from the battery cell 120. Specifically, since the top cover 130 further includes the cover plate portion 134, the cover plate portion 134 covers the central area of the top cover 130, the recess portion 135 is disposed between the cover plate portion 134 and the first bending section 131, and the heights of the cover plate portion 134 and the first connecting section 132 from the battery cell 120 are the same, the cover plate portion 134 of the top cover 130 can be made to transition through the recess portion 135 and the first bending section 131, so that under the condition that the first bending section 131 and the second bending section 113 keep contact, a larger space can be provided for the battery cell 120 in the direction towards the cover plate portion 134, and the battery 100 has a larger energy density.

Alternatively, the depth of the recess 135 is greater than 0.5mm and the width of the recess 135 is less than 0.6mm. Specifically, since the depth of the recess 135 is greater than 0.5mm, and the width of the recess 135 is less than 0.6mm, the depth of the recess 135 is not too small to affect the connection between the first bending section 131 and the second bending section 113, and the width of the recess 135 is not too large to affect the space occupied by the battery cell 120 in the direction towards the cover plate 134.

As an alternative embodiment, the battery 100 further includes a post 140 and a negative reinforcement sheet 150. Fig. 6 is an exploded view of the battery of fig. 1. As shown in fig. 6, the post 140 is connected to the positive electrode of the battery cell 120, and the negative electrode reinforcing sheet 150 is connected to the negative electrode of the battery cell 120. Specifically, since the battery 100 further includes the post 140 and the negative electrode reinforcing sheet 150, the post 140 is connected to the positive electrode of the battery cell 120, and the negative electrode reinforcing sheet 150 is connected to the negative electrode of the battery cell 120, the battery 100 can electrically connect the internal battery cell 120 and the external electronic device through the post 140 and the negative electrode reinforcing sheet 150.

As an alternative embodiment, battery 100 further includes a adapter block 160, adapter block 160 including a first adapter block 161 and a second adapter block 162, first adapter block 161 being connected between the positive electrode of cell 120 and post 140; the second switching block 162 is connected between the negative electrode of the battery cell 120 and the negative electrode reinforcing sheet 150. Specifically, since the battery 100 further includes the adapter block 160, the adapter block 160 includes the first adapter block 161 and the second adapter block 162, and the first adapter block 161 is connected between the positive electrode of the battery cell 120 and the post 140; the second switching block 162 is connected between the negative electrode of the battery cell 120 and the negative electrode reinforcing sheet 150, so that when the positive electrode of the battery cell 120, the negative electrode reinforcing sheet 150 and the negative electrode of the battery cell 120 cannot be contacted due to the positions, the positive electrode of the battery cell 120 and the positive electrode 140 are electrically connected through the first switching block 161, and the negative electrode of the battery cell 120 and the negative electrode reinforcing sheet 150 are electrically connected through the second switching block 162.

The connection process of the battery 100 provided in the present application is as follows: battery 100 includes a housing 110, a cell 120, and a top cover 130. The housing 110 has an opening 111, and the top cover 130 covers the opening 111 to form a cavity together with the housing 110. The battery cell 120 is disposed in the cavity, the edge of the opening 111 has a folded edge 112 extending to the outside of the opening 111, and the edge of the top cover 130 sequentially has a first bending section 131 and a first connecting section 132 from inside to outside.

The folded edge 112 includes a second bending section 113 and a second connecting section 114, the second bending section 113 is connected between the cavity wall of the cavity and the second connecting section 114, the first bending section 131 bends towards the inner side of the cavity, the second connecting section 114 is connected with the first connecting section 132 in a fitting manner, and the first bending section 131 is partially fitted with the second bending section 113.

Because the first connecting section 132 and the second connecting section 114 are connected, and the first bending section 131 and the second bending section 113 are connected, under the condition of ensuring the edge sealing contact area of the casing 110 and the top cover 130, fewer positions can be occupied between the first connecting section 132 and the second connecting section 114, the space occupied by the first connecting section 132 of the top cover 130 is further reduced, and therefore, the battery cell 120 can occupy larger space inside the first bending section 131 and the second bending section 113, and the energy density of the battery 100 is improved.

The battery comprises a shell, a battery cell and a top cover, wherein the shell is provided with an opening, the top cover is covered on the opening and forms a cavity together with the shell, the battery cell is arranged in the cavity, and the edge of the opening is provided with a folded edge extending to the outer side of the opening; the edge of top cap has first bending section and first connecting section from inside to outside in proper order, and first connecting section and hem laminating are connected, and first bending section is buckled to the cavity inboard. The battery of the application can improve the energy density of the battery.

In the description of the present application, it is to be understood that the terms "center," "length," "width," "thickness," "top," "bottom," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "axial," "circumferential," etc. are used to indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the locations or elements referred to must have a particular orientation, in a particular configuration and operation, and therefore are not to be construed as limiting of the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intermediaries, may be in communication with each other within two elements or in interaction with each other, unless explicitly defined otherwise, and the specific meaning of such terms in this application will be understood by those of ordinary skill in the art.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The battery is characterized by comprising a shell, a battery core and a top cover, wherein the shell is provided with an opening, the top cover is covered on the opening and forms a cavity together with the shell, the battery core is arranged in the cavity, and the edge of the opening is provided with a folded edge extending to the outer side of the opening; the edge of top cap has first bending section and first connecting section from inside to outside in proper order, first connecting section with the hem laminating is connected, first bending section to the cavity inboard is buckled.

2. The battery of claim 1, wherein the flange includes a second bent segment and a second connecting segment, the second bent segment being connected between the cavity wall of the cavity and the second connecting segment, the second connecting segment being in abutting connection with the first connecting segment.

3. The battery of claim 2, wherein the first bending section and the second bending section are each circular arc sections, and the first bending section and the second bending section are at least partially attached.

4. The battery of claim 1, wherein the central region of the top cover forms a recess, the recess being connected to the first bending section, the recess being recessed in the first bending section.

5. The battery of claim 4, wherein a projection of the recess in a thickness direction does not coincide with a projection of the cell.

6. The battery of claim 2, wherein the second bending section is provided with a first surface and a second surface, the first surface being proximate to the first bending section and the second surface being distal to the first bending section;

the first bending section is provided with a third surface and a fourth surface, the third surface is close to the second bending section, and the fourth surface is far away from the second bending section;

the first surface and the third surface are mutually attached.

7. The battery of claim 6, wherein the first surface corresponds to a bend radius equal to a sum of the second surface corresponds to a bend radius and a thickness of the housing.

8. The battery of claim 6, wherein the second surface has a corresponding bend radius of 0.05-0.3mm;

and/or the thickness of the shell is 0.05-0.3mm.

9. The battery of claim 6, wherein the third surface corresponds to a bend radius equal to the bend radius of the first surface.

10. The battery of claim 6, wherein the fourth surface corresponds to a bend radius equal to a sum of the bend radius corresponding to the third surface and the thickness of the top cap.

11. The battery of claim 1, wherein the top cover and the housing are welded together and the welded area does not exceed the inside wall of the housing.

12. The battery of claim 1, wherein the top cover further comprises a cover plate portion covering a central region of the top cover, a recess is provided between the cover plate portion and the first bending section, and the cover plate portion and the first connecting section are at the same height from the battery cell.

13. The battery of claim 12, wherein the depth of the recess is greater than 0.5mm and the width of the recess is less than 0.6mm.