CN221486759U - Battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery and an electric device, wherein the battery comprises an electrode assembly, a top cover assembly and a sealing part; the electrode assembly comprises a winding core body and a tab, and the tab is connected with the winding core body; the top cover assembly comprises an electrode terminal, a first groove is formed in one side, far away from the winding core body, of the electrode terminal, a first through hole is formed in the electrode terminal, the first through hole penetrates through the electrode terminal and is communicated with the first groove, the first groove comprises a bottom wall, and the electrode lug penetrates through the first through hole and is connected with the bottom wall; the sealing part is connected with the electrode terminal and covers the first groove. According to the application, the first through hole and the first groove are arranged, so that the tab can conveniently penetrate through the first through hole directly and be bent and accommodated in the first groove, the tab is bent at one side of the electrode terminal far away from the winding core body and is connected with the electrode terminal, and meanwhile, the first groove is covered and sealed by the sealing part, so that the tightness of the battery is maintained, the internal space of the battery is effectively saved, the space utilization rate is improved, and the energy density of the battery is further improved.

Description

Battery and electricity utilization device

Technical Field

The application belongs to the technical field of power batteries, and particularly relates to a battery and an electric device.

Background

The storage unit of the power battery is a battery cell, and in order to increase the energy density of the power battery, the battery cell may be composed of a plurality of electrode assemblies. The electrode assemblies are placed side by side, and the tabs need to be bent when they are inserted into the case. The tab bending occupies a large amount of internal space of the battery, so that the space utilization rate is low, and the energy density of the battery is reduced.

Disclosure of utility model

The utility model aims to: the embodiment of the utility model provides a battery, which aims to solve the problem that the bending of the existing tab occupies a large amount of internal space of the battery; another object of an embodiment of the present utility model is to provide an electric device.

The technical scheme is as follows: the battery according to the embodiment of the application comprises:

the electrode assembly comprises a winding core body and a tab, and the tab is connected with the winding core body;

the top cover assembly comprises an electrode terminal, a first groove is formed in one side, far away from the winding core body, of the electrode terminal, a first through hole is formed in the electrode terminal, the first through hole penetrates through the electrode terminal and is communicated with the first groove, the first groove comprises a bottom wall, and the tab penetrates through the first through hole and is connected with the bottom wall;

And a sealing part connected with the electrode terminal and covering the first groove.

In some embodiments, the tab includes a first section and a second section that are connected, one end of the first section that is away from the second section is connected with the winding core body, the first section is worn to establish in the first through hole, and the second section is located in the first recess and with the diapire laminating.

In some embodiments, the second segment extends in a first direction along which the first groove has a width dimension of a mm and the second segment has a length of b mm, a and b satisfying: b/a is more than 0.5 and less than 1.

In some embodiments, the direction of the winding core body toward the top cover assembly is a second direction, the second direction intersects the first direction, the depth of the first groove is cmm along the second direction, the thickness of the second section is d mm, and c and d satisfy: c is more than or equal to d.

In some embodiments, a second groove is formed in the bottom wall, a second through hole is formed in the second section, the second groove corresponds to the second through hole, a first protrusion is arranged at a position, opposite to the second groove, of the sealing portion, and the first protrusion penetrates through the second through hole and is inserted into the second groove.

In some embodiments, in the second direction, the thickness of the electrode terminal is f mm, and the depth of the second groove is g mm, satisfying: g+c < f.

In some embodiments, the height of the first protrusions along the second direction is e mm, c < e.ltoreq.c+g.

In some embodiments, a second protrusion is disposed on the bottom wall, the second protrusion extends along the second direction, the second section is provided with a second through hole, and the second protrusion is disposed in the second through hole in a penetrating manner.

In some embodiments, in the second direction, the height of the second protrusion is h mm, satisfying: d is more than or equal to h and less than or equal to c.

Accordingly, an electrical device according to an embodiment of the present application includes a battery according to any one of the foregoing embodiments, where the battery is configured to supply power to the electrical device.

The beneficial effects are that: compared with the prior art, the battery of the embodiment of the application comprises an electrode assembly, a top cover assembly and a sealing part; the electrode assembly comprises a winding core body and a tab, and the tab is connected with the winding core body; the top cover assembly comprises an electrode terminal, a first groove is formed in one side, far away from the winding core body, of the electrode terminal, a first through hole is formed in the electrode terminal, the first through hole penetrates through the electrode terminal and is communicated with the first groove, the first groove comprises a bottom wall, and the electrode lug penetrates through the first through hole and is connected with the bottom wall; the sealing part is connected with the electrode terminal and covers the first groove. According to the application, the first through hole and the first groove are arranged, so that the tab can conveniently penetrate through the first through hole directly and be bent and accommodated in the first groove, the tab is bent at one side of the electrode terminal far away from the winding core body and is connected with the electrode terminal, and meanwhile, the first groove is covered and sealed by the sealing part, so that the tightness of the battery is maintained, the internal space of the battery is effectively saved, the space utilization rate is improved, and the energy density of the battery is further improved.

Compared with the prior art, the electric device provided by the embodiment of the application comprises the battery provided by any one of the previous embodiments, and the battery is used for supplying power to the electric device. It is understood that the power utilization device may have all the technical features and corresponding beneficial effects of the above battery, and will not be described herein.

Drawings

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

Fig. 1 is a schematic view of the overall structure of a battery of the present application;

FIG. 2 is an exploded view of the overall structure of a battery of the present application;

fig. 3 is a schematic view showing the structure of an electrode assembly of a battery according to the present application when not assembled;

fig. 4 is a cross-sectional view along a first direction of an embodiment of a battery of the present application;

fig. 5 is a schematic structural view of an electrode assembly according to an embodiment of the present application;

fig. 6 is a schematic structural view of an electrode terminal according to an embodiment of the present application;

fig. 7 is a cross-sectional view of an electrode terminal according to an embodiment of the present application;

fig. 8 is a cross-sectional view of a battery according to two embodiments of the present application along a first direction;

fig. 9 is a schematic structural view of an electrode terminal according to two embodiments of the present application;

FIG. 10 is a schematic structural view of a sealing portion according to two embodiments of the present application;

fig. 11 is a schematic structural view of an electrode assembly according to a second embodiment and a third embodiment of the present application;

Fig. 12 is a cross-sectional view of a battery according to a third embodiment of the present application along a first direction;

Fig. 13 is a schematic structural view of an electrode terminal according to a third embodiment of the present application.

Reference numerals:

1-electrode assembly, 11-winding core body, 12-tab, 121-first section, 122-second section, 1221-second through hole, 2-top cover assembly, 21-electrode terminal, 211-first through hole, 212-first groove, 2121-bottom wall, 2122-second groove, 2123-second protrusion, 22-sealing portion, 221-first protrusion, X-first direction, Y-second direction.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below 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, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting 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 features. In the description of the present application, the meaning of "plurality" means two or more, and at least one means one, two or more, unless explicitly defined otherwise. In the description of the present application, "perpendicular" means completely perpendicular at 90 ° or almost completely perpendicular, for example, as perpendicular in the range of 80 ° to 100 °, and similarly, "parallel" means completely parallel or almost completely parallel, for example, as parallel in the range of 10 ° of complete parallel.

It should be further noted that, in the drawings of the present application, an arrow denoted by X is used to indicate a first direction X, and an arrow denoted by Y is used to indicate a second direction Y, where in the embodiment of the present application, the first direction X is a direction in which the second section 122 extends, and the second direction Y is a direction in which the winding core body 11 faces the top cover assembly 2, and the first direction X and the second direction Y are introduced to facilitate description of a structural positional relationship of each component of the battery, so as to facilitate understanding of a structure thereof.

The power battery is used as a core component and an energy source of the electric automobile, and the storage capacity of the power battery determines the endurance mileage of the automobile. The storage unit of the power battery is a single battery, and the single battery generally consists of a top cover, a shell and an electrode assembly. In order to increase the energy density of the battery, a plurality of electrode assemblies are generally arranged in the battery, and the electrode assemblies are arranged side by side and need to be bent by using a switching piece when the tab is put into the case. And the bending of the tab occupies a large amount of internal space of the battery, so that the space utilization rate is low, and the energy density of the battery is reduced.

In view of the above, an embodiment of the present application provides a battery to solve the above-mentioned problems.

Referring to fig. 1 to 13 in combination, an embodiment of the present application provides a battery including an electrode assembly 1, a top cap assembly 2, and a sealing part 22; the electrode assembly 1 comprises a winding core body 11 and a tab 12, and the tab 12 is connected with the winding core body 11; the top cover assembly 2 comprises an electrode terminal 21, a first groove 212 is formed in one side, far away from the winding core body 11, of the electrode terminal 21, a first through hole 211 is formed in the electrode terminal 21, the first through hole 211 penetrates through the electrode terminal 21 and is communicated with the first groove 212, the first groove 212 comprises a bottom wall 2121, and the tab 12 penetrates through the first through hole 211 and is connected with the bottom wall 2121; the sealing part 22 is connected to the electrode terminal 21 and covers the first groove 212.

In the embodiment of the present application, the electrode terminal 21 is connected to the tab 12 for realizing charge and discharge; a first through hole 211 is formed on the electrode terminal 21 for allowing the tab 12 to directly pass through the first through hole 211; then, a first groove 212 is provided for allowing the tab 12 to pass through the bending space after passing through the first through hole 211; the tab 12 is bent in the first groove 212 and then connected with the bottom wall 2121 of the first groove 212, so that the connection between the tab 12 and the electrode terminal 21 is realized; the tab 12 is penetrated out from the first through hole 211, a gap is inevitably formed between the tab 12 and the hole wall of the first through hole 211, so that the problem that the battery is not sealed exists, and therefore, the sealing part 22 is further arranged, the first groove 212 is covered by the sealing part 22, the first through hole 211 is connected with the first groove 212, the first through hole 211 is connected with the inner cavity of the battery, and therefore, under the condition of sealing the first groove 212, the sealing of the conductive terminal can be realized, and the sealing of the battery is further realized. Therefore, through the design of the structure, the bending of the electrode lug 12 at one side (namely the inside of the battery) of the electrode terminal 21, which is close to the winding core body 11, can be transferred to one side of the electrode terminal 21, which is far away from the winding core body 11, so that the occupation of the internal space of the battery is effectively reduced, the space utilization rate is improved, and the energy density of the battery is further improved.

It should be noted that, the electrode assembly 1 of the present application may be one or more, the corresponding winding core body 11 may be one or more, and the corresponding tab 12 may be one or more. In the case of one electrode assembly 1, the tab 12 is located directly under the electrode terminal 21, and the tab 12 directly passes through the first through hole 211 and is bent into the first groove 212, and then is connected with the bottom wall 2121; in the case of a plurality of electrode assemblies 1, a plurality of tabs 12 are folded to form a tab 12 set, and the tab 12 set passes through the first through hole 211 and is bent in the first groove 212, and finally is connected with the bottom wall 2121. After the tab 12 or the tab 12 group is bent in the first groove 212 and connected to the bottom wall 2121, the first groove 212 is sealed by the sealing portion 22, so that the battery is sealed. At this time, the purpose of reducing the occupation of the internal space of the battery is correspondingly realized, the space utilization rate is effectively improved, and the energy density of the battery is further improved.

Referring to fig. 4, 5, 8, 11 and 12, in some embodiments, the tab 12 includes a first section 121 and a second section 122 connected to each other, the second section 122 is bent relative to the first section 121, one end of the first section 121 away from the second section 122 is connected to the winding core body 11, the first section 121 is disposed in the first through hole 211 in a penetrating manner, and the second section 122 is located in the first groove 212 and is attached to the bottom wall 2121.

In this embodiment, the first section 121 of the tab 12 is disposed in the first through hole 211, the first through hole 211 is utilized to provide a passing space of the first section 121, and the length of the first section 121 is preferably equal to the distance between the bottom wall 2121 and a side of the winding core body 11 facing the electrode terminal 21 along the second direction Y, at this time, the tab 12 extends along the second direction Y, and no unnecessary bending portion is provided, so that an interpolation short circuit caused by too long tab 12 can be effectively avoided. The second section 122 is bent into the first groove 212 and is attached to the bottom wall 2121 of the first groove 212, so that the second section 122 of the tab 12 is connected to the electrode terminal 21.

Note that, the second section 122 of the present application may be adhered to the bottom wall 2121 by using a conductive adhesive or directly welded by using a solder, so as to achieve the electrical conduction between the tab 12 and the electrode terminal 21.

It should be further noted that, in the present application, the tab 12 is configured as the first section 121 and the second section 122 which are bent relatively, the first section 121 extends directly to the electrode terminal 21, the second section 122 is bent in the first groove 212, and the design of the first through hole 211 and the first groove 212 of the tab terminal 21 is overlapped to provide a path for extending the tab 12, and the whole structure is flat and orderly, so that the length redundancy of the tab 12 is effectively avoided.

In addition, in the case where the plurality of tabs 12 are folded, the first section 121 corresponds to a portion of the folded tab 12 group from the point of separation to the intersection between the wall of the first through hole 211 and the bottom wall 2121, and the second section 122 corresponds to a portion of the folded tab 12 group located in the first groove 212.

As shown in fig. 8, in some embodiments, the second section 122 extends in a first direction X along which the first groove 212 has a width dimension of a mm and the second section 122 has a length of b mm, a and b satisfying: b/a is more than 0.5 and less than 1.

In the embodiment of the present application, by setting 0.5 < b/a < 1, and correspondingly 0.5X a < b < a, that is, the length of the second section 122 along the first direction X is greater than one half of the width of the first groove 212 along the first direction X, it is possible to cover a larger range of the bottom wall 2121 by the second section 122, so that the second section 122 cannot be further bent or protruded to the outside of the first groove 212, and at this time, sufficient contact connection between the bottom wall 2121 and the second section 122 is facilitated, and the stability of connection is ensured.

Specifically, since the second section 122 is tiled on the bottom wall 2121 of the first groove 212, if the length of the second section 122 along the first direction X is smaller than half of the width of the first groove 212 along the first direction X, at this time, the contact area between the corresponding second section 122 and the bottom wall 2121 is smaller, and there is a risk of poor welding or adhesion, at this time, effective connection between the second section 122 and the bottom wall 2121 may not be ensured, and in the embodiment of the present application, the tab 12 is only fixed by being connected to the bottom wall 2121, which may cause the tab 12 to fall off from the bottom wall 2121 due to the influence of vibration or other factors during subsequent use. If the length of the second section 122 in the first direction X is greater than the width of the first groove 212 along the first direction X, the second section 122 reaches the sidewall of the first groove 212 and is correspondingly bent beyond the first groove 212, and the resealing portion 22 cannot be used to seal the first groove 212. In addition, the length of the second section 122 in the first direction X is equal to the width of the first groove 212 in the first direction X, at which point it is theoretically felt that the second section 122 may be completely accommodated in the first groove 212, but the position of the first through hole 211 is also considered, and the first through hole 211 is generally located at the side of the bottom wall 2121, so that a larger extension space is provided for the second section 122. However, the gap of the first through hole 211 is generally required to be greater than the thickness of the tab 12, so that the tab 12 smoothly passes through the first through hole 211, at this time, the tab 12 is bent again to form the second section 122, and correspondingly, the length of the second section 122 starts to be counted from the first through hole 211, and meanwhile, a gap is reserved in the first groove 212 so that the conductive adhesive or the welding solder overflows, so that the second section 122 and the conductive terminal can be effectively connected, therefore, the length of the second section 122 in the first direction X is equal to the width of the first groove 212 along the first direction X, and effective welding cannot be achieved, and there is a case that the second section 122 cannot be completely accommodated in the first groove 212.

The corresponding value range of the ratio of the length of the second segment 122 of the present application in the first direction X to the width of the first groove 212 in the first direction X may be: any number or range of values between any two of 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.62, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95. The larger the value, the better the connection effect of the corresponding tab 12 and the electrode terminal 21. The length of the second section 122 and the width of the first groove 212 can be obtained by measuring with a conventional length measuring tool such as a vernier caliper.

As shown in fig. 8 and 12, in some embodiments, the direction of the winding core body 11 toward the top cover assembly 2 is a second direction Y intersecting the first direction X, along which the depth of the first groove 212 is c mm, and the thickness of the second segment 122 is d mm, c and d satisfying: c is more than or equal to d.

In the present embodiment, the thickness of the second section 122 along the second direction Y is less than or equal to the depth of the first groove 212, so that the second section 122 can be located in the first groove 212 instead of protruding partially outside the first groove 212. This arrangement prevents the second section 122 from supporting the seal 22 spaced between the seal 22 and the first recess 212 such that the seal 22 cannot seal the first recess 212.

In some embodiments, the bottom wall 2121 is provided with a second groove 2122, the second section 122 is provided with a second through hole 1221, the second groove 2122 corresponds to the second through hole 1221, the sealing portion 22 is provided with a first protrusion 221 opposite to the second groove 2122, and the first protrusion 221 passes through the second through hole 1221 and is inserted into the second groove 2122.

In this embodiment, by providing the first protrusion 221 extending along the second direction Y on the sealing portion 22, providing the second through hole 1221 on the second section 122, and providing the second groove 2122 extending along the second direction Y on the bottom wall 2121, in a specific implementation, the first protrusion 221 passes through the second through hole 1221 and is disposed in the second groove 2122 in a penetrating manner, and by using the cooperation of the first protrusion 221 and the second through hole 1221, effective limitation of the second section 122 is achieved, and then mutual limitation of the first protrusion 221 and the second groove 2122 is utilized, so that the second section 122 is effectively prevented from falling off from the first protrusion 221, and poor contact between the tab 12 and the conductive terminal or short circuit in the tab 12 caused by retraction of the tab 12 into the battery is prevented.

Referring to fig. 8, in some embodiments, in the second direction Y, the thickness of the electrode terminal 21 is f mm, and the depth of the second groove 2122 is g mm, which satisfies the following: g+c < f.

It should be noted that, by limiting the thickness of the electrode terminal 21 to be greater than the depth of the second groove plus the depth of the first groove 212, the present application avoids the second groove 2122 from communicating with the first groove 212 and then penetrating the electrode terminal 21, thereby reducing the risk of leakage of the electrolyte in the battery.

Preferably, the thickness range of the electrode terminal 21 according to the embodiment of the present application is: 0.5< f <10. In the embodiment where the second groove 2122 and the first protrusion 221 are not provided, the electrode terminal 21 may be selected to have a smaller thickness, and it is only necessary to provide the first groove 212 to accommodate the second section 122. Whereas for the embodiment in which the second grooves 2122 and the second protrusions 2123 are provided, the corresponding electrode terminals 21 need to be selected to have a relatively large thickness in order to simultaneously realize the provision of the first grooves 212 and the second grooves 2122 on the electrode terminals 21. Specifically, in the embodiment of the present application, the thickness of the electrode terminal 21 may be any value or a range between any two values of 0.55, 0.6, 0.7, 0.9, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 78, 8, 9, and 9.9. The thickness of the electrode terminal 21 can be measured by a conventional length measuring tool such as a vernier caliper.

In some embodiments, the height of the first protrusions 221 along the second direction Y is e mm, c < e.ltoreq.c+g.

In the present embodiment, the height of the first protrusion 221 is defined to be equal to or less than the depth of the first groove 212 and the second groove 2122, so that the first protrusion 221 can be smoothly inserted into the second groove 2122, and the sealing portion 22 can be smoothly sealed to the first groove 212. If the height of the first protrusion 221 is greater than the depths of the first groove 212 and the second groove 2122, a gap exists between the corresponding sealing portion 22 and the first groove 212, and the first groove 212 cannot be sealed.

In some embodiments, the bottom wall 2121 is provided with a second protrusion 2123, the second protrusion 2123 extends along the second direction Y, the second section 122 is provided with a second through hole 1221, and the second protrusion 2123 is disposed through the second through hole 1221.

In this embodiment, by providing the second protrusion 2123 on the bottom wall 2121 and extending toward the sealing portion 22 along the second direction Y, the second protrusion 2123 may be disposed in the second through hole 1221, so that the second section 122 can be fixed on the second protrusion 2123 through the second through hole 1221, and the second protrusion 2123 is used to fix the second section 122, so that the second section 122 is released in an effective manner, and the fixing stability of the second section 122 is ensured.

Further, in some embodiments, in the second direction Y, the height of the second protrusions 2123 is h mm, satisfying: d is more than or equal to h and less than or equal to c.

Specifically, the present embodiment defines the height of the second protrusion 2123 along the second direction Y to be greater than or equal to the thickness of the second section 122, so as to ensure that the second through hole 1221 can be completely sleeved outside the second protrusion 2123, thereby ensuring the stability of positioning the second protrusion 2123 on the second section 122, and preventing the second section 122 from being released from the second protrusion 2123. The second protrusion 2123 is provided with a height smaller than or equal to the depth of the first groove 212, so that the second protrusion 2123 can be effectively prevented from supporting the sealing portion 22, and the sealing portion 22 can effectively cover the first groove 212 to realize effective sealing.

Accordingly, an electrical device according to an embodiment of the present application includes a battery according to any of the foregoing embodiments, the battery being configured to supply power to the electrical device.

It can be understood that the electric device includes the functions of the battery described in the foregoing embodiments, which are not described herein.

Of course, the electric equipment referred to by the application can comprise, but is not limited to, a standby power supply, an electrode, an electric automobile, an electric bicycle, an electric motorcycle, a large storage battery and the like.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The battery and the power consumption device provided by the embodiment of the application are described in detail, and the specific examples are applied to illustrate the principle and the implementation of the application, and the description of the above embodiment is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (10)

1. A battery, comprising:

An electrode assembly (1), wherein the electrode assembly (1) comprises a winding core body (11) and a tab (12), and the tab (12) is connected with the winding core body (11);

The top cover assembly (2), the top cover assembly (2) comprises an electrode terminal (21), a first groove (212) is formed in one side, far away from the winding core body (11), of the electrode terminal (21), a first through hole (211) is formed in the electrode terminal (21), the first through hole (211) penetrates through the electrode terminal (21) and is communicated with the first groove (212), the first groove (212) comprises a bottom wall (2121), and the tab (12) penetrates through the first through hole (211) and is connected with the bottom wall (2121);

And a sealing part (22), wherein the sealing part (22) is connected with the electrode terminal (21) and covers the first groove (212).

2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The tab (12) comprises a first section (121) and a second section (122) which are connected, one end, away from the second section (122), of the first section (121) is connected with the winding core body (11), the first section (121) penetrates through the first through hole (211), and the second section (122) is located in the first groove (212) and is attached to the bottom wall (2121).

3. The battery according to claim 2, characterized in that the extension direction of the second section (122) is a first direction (X) along which the width dimension of the first groove (212) is a mm, the length of the second section (122) is b mm, a and b satisfying: b/a is more than 0.5 and less than 1.

4. A battery according to claim 3, characterized in that the direction of the winding core body (11) towards the top cap assembly (2) is a second direction (Y) intersecting the first direction (X), along which second direction (Y) the depth of the first groove (212) is c mm, the thickness of the second section (122) is d mm, c and d being such that: c is more than or equal to d.

5. The battery according to claim 4, wherein a second groove (2122) is provided in the bottom wall (2121), the second section (122) is provided with a second through hole (1221), the second groove (2122) corresponds to the second through hole (1221), a first protrusion (221) is provided at a position of the sealing portion (22) opposite to the second groove (2122), and the first protrusion (221) passes through the second through hole (1221) and is inserted into the second groove (2122).

6. The battery according to claim 5, characterized in that, in the second direction (Y), the thickness of the electrode terminal (21) is f mm, and the depth of the second groove (2122) is g mm, satisfying: g+c < f.

7. The battery according to claim 6, characterized in that, in the second direction (Y), the height of the first protrusions (221) is e mm, c < e +.c+g.

8. The battery according to claim 4, wherein a second protrusion (2123) is provided on the bottom wall (2121), the second protrusion (2123) extending in the second direction (Y), the second section (122) being provided with a second through hole (1221), the second protrusion (2123) being provided through the second through hole (1221).

9. The battery according to claim 8, characterized in that, in the second direction (Y), the height of the second protrusions (2123) is h mm, satisfying: d is more than or equal to h and less than or equal to c.

10. An electrical device comprising a battery as claimed in any one of claims 1 to 9 for powering the electrical device.