CN214411334U - Battery and electronic equipment - Google Patents

Abstract

The utility model provides a battery and electronic equipment, the battery comprises a shell, an electrode component and a sealing piece, a containing cavity is arranged in the shell, the electrode component is positioned in the containing cavity, and a liquid injection hole for injecting electrolyte into the containing cavity is arranged on the shell; the outer surface of the shell is provided with a sunken part which is sunken to the inner side of the accommodating cavity, and the sunken part is positioned at the orifice of the liquid injection hole and is communicated with the liquid injection hole; the sealing piece is welded on the outer side of the shell to seal the concave part and the liquid injection hole. The utility model discloses a battery and electronic equipment security, reliability are higher.

Description

Battery and electronic equipment

Technical Field

The utility model relates to a battery technology field especially relates to a battery and electronic equipment.

Background

Along with the development of economy and the progress of science and technology, intelligent products are more and more developed towards the direction of lightness and miniaturization, and button cells capable of being repeatedly charged and used in a circulating mode are gradually applied to various fields of daily life of people.

The existing button cell comprises a metal shell, and a positive plate, a negative plate, a positive tab, a negative tab and other structures arranged in the metal shell. The casing is also provided with a liquid filling port for filling electrolyte, the liquid filling port is covered with a sealing piece in a sealing manner, and in the manufacturing process, the electrolyte is filled into the metal casing through the liquid filling port and the sealing piece is welded on the casing to cover the liquid filling port.

However, in the above-described liquid injection operation through the liquid injection port, electrolyte residue tends to be generated in the case near the liquid injection port, and this residual electrolyte tends to affect the sealing performance of the welding when the sealing member and the case are welded, resulting in deterioration of both safety and stability of the button cell.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing problems, embodiments of the present application provide a battery and an electronic device with better safety and stability.

In order to achieve the above object, a first aspect of the present application provides a battery, including a case, an electrode assembly, and a sealing member, wherein the case has a receiving cavity, the electrode assembly is located in the receiving cavity, and the case is provided with a liquid injection hole for injecting an electrolyte into the receiving cavity; the outer surface of the shell is provided with a sunken part which is sunken to the inner side of the accommodating cavity, and the sunken part is positioned at the orifice of the liquid injection hole and is communicated with the liquid injection hole; the sealing piece is welded on the outer side of the shell to seal the concave part and the liquid injection hole.

In an alternative embodiment, the recess surrounds the orifice in the circumferential direction of the pour hole, so that the recess forms a counter-bore structure.

In an alternative embodiment, the shell comprises a lower shell and a cover plate assembly, and the lower shell and the cover plate assembly jointly enclose a containing cavity;

the cover plate assembly comprises a top cover and a conductive piece, the top cover is connected to the top of the lower shell, a through hole is formed in the top cover, the conductive piece covers the through hole, and the conductive piece is in insulated connection with the top cover; the liquid filling hole is positioned on the conductive piece, and the sealing piece is welded on the conductive piece so as to seal the concave part and the liquid filling hole.

In an alternative embodiment, the conductive member includes a boss portion disposed corresponding to the through hole of the top cap, and the boss portion protrudes outside of the other portion of the conductive member to protrude into the receiving cavity through the through hole, and the electrode assembly includes a first tab electrically connected to the boss portion.

In an alternative embodiment, the sealing member and the conductive member are welded to each other to form a first welding impression, and the first welding impression is located on the side, facing the sealing member, of the conductive member; the first tab and the boss part are welded and connected with each other to form a second welding mark, and the second welding mark is positioned on one surface of the conductive piece, which is far away from the sealing piece; the first welding impression and the second welding impression are staggered; or

The first and second solder impressions overlap each other.

In an alternative embodiment, the protruding end face of the boss portion is located at a lower height relative to the bottom of the lower case than the bottom end face of the top cover.

In an optional implementation mode, be equipped with the mounting groove on the face that deviates from boss portion on the electrically conductive piece, the mounting groove corresponds with the boss, annotates the tank bottom that the liquid hole is located the mounting groove, and the sealing member is installed in the mounting groove.

In an alternative embodiment, the shell comprises a lower shell and a cover plate assembly, and the lower shell and the cover plate assembly jointly enclose a containing cavity; the lower shell comprises a bottom wall and a side wall surrounding the bottom wall, the bottom end of the side wall is connected with the bottom wall, the liquid injection hole is located in the bottom wall, and the sealing piece is connected to the bottom wall so as to seal the liquid injection hole.

In an optional embodiment, the cover plate assembly comprises a top cover and a conductive piece, the top cover is connected to the top end of the side wall, a through hole is formed in the top cover, the conductive piece covers the through hole, and the conductive piece is in insulated connection with the top cover; the electrode assembly comprises a first tab and a second tab, the first tab is welded with the conductive piece, and the second tab is welded with the bottom wall.

The second aspect of the present application provides an electronic device, which includes an electronic device body and the above battery, wherein the battery provides electric energy for the electronic device body.

In the embodiment of the application, the battery comprises a shell, an electrode assembly and a sealing piece, wherein the shell is internally provided with an accommodating cavity, the electrode assembly is positioned in the accommodating cavity, and the shell is provided with a liquid injection hole for injecting electrolyte into the accommodating cavity; the outer surface of the shell is provided with a sunken part which is sunken to the inner side of the accommodating cavity, and the sunken part is positioned at the orifice of the liquid injection hole and is communicated with the liquid injection hole; the sealing piece is welded on the outer side of the shell to seal the concave part and the liquid injection hole. In the above-mentioned scheme, through set up the depressed part in the drill way department of notes liquid hole to the oral area of depressed part is opened towards the outside of casing, and after the electrolyte is poured into, remains the electrolyte near the drill way department of notes liquid hole and can hold in the depressed part, and can not adhere to the welding zone on the surface of casing, consequently can not influence the welding operation of sealing and casing, also can not influence welded leakproofness, consequently the security of battery, stability are all preferred.

The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a schematic overall structure diagram of a battery provided in an embodiment of the present application;

fig. 2 is a schematic cross-sectional view of a battery provided in an embodiment of the present application taken along a first tab;

FIG. 3 is a schematic cross-sectional view of a battery provided in an embodiment of the present application taken along a second tab;

fig. 4 is a cross-sectional view of a cover plate assembly in a battery according to an embodiment of the present disclosure;

fig. 5 is a schematic cross-sectional view of another structure of a battery provided in an embodiment of the present application;

fig. 6 is a schematic cross-sectional view of another structure of a battery provided in an embodiment of the present application;

fig. 7 is a schematic overall structure diagram of another structure of a battery provided in an embodiment of the present application.

Description of reference numerals:

100. 200-button cell; 10-a housing; 11-a containment chamber; 12-a cover plate assembly; 121-a top cover; 1211-through hole; 72. 122-a conductive member; 1221-a boss portion; 1222-a lap joint; 1223-mounting grooves; 123-hot melt PP glue; 124-shell insulating glue; 125-first solder print; 126-second solder print; 13-a lower shell; 131-a bottom wall; 132-a side wall; 20-an electrode assembly; 21-a first pole piece; 22-a second pole piece; 23-a barrier film; 24-a winding core; 241-hollow part; 242-end face insulating glue; 25-a first tab; 26-a second tab; 30. 71-a closure; 50. 70-liquid injection hole; 51-an orifice; 60-a recess; 74-bottom mounting groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the accompanying drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The existing button cell has the technical problem that poor welding tightness easily causes poor safety and stability of the button cell when a sealing sheet and a metal shell are welded. This is because, when the electrolyte is injected into the metal case through the injection port, a part of the electrolyte remains in the vicinity of the welding region of the metal case, and the welding operation between the metal case and the sealing sheet is affected.

And the button cell of this application is through setting up the depressed part in the drill way department of annotating the liquid hole, plays the effect as the detention portion of remaining electrolyte, can effectively avoid electrolyte to adhere to in the weld zone on the casing surface to avoid causing the influence to the welding of sealing and casing.

The battery according to the embodiment of the present application is described below with reference to the drawings, and it should be noted that the battery is taken as a button cell battery as an example in the present application.

Fig. 1 is a schematic overall structure diagram of a battery provided in an embodiment of the present application, fig. 2 is a schematic cross-sectional view of the battery provided in the embodiment of the present application, the cross-sectional view being taken along a first tab, fig. 3 is a schematic cross-sectional view of the battery provided in the embodiment of the present application, the cross-sectional view being taken along a second tab, and fig. 4 is a cross-sectional view of a cover plate assembly in the battery provided in the embodiment of the present application.

Referring to fig. 1, 2, 3 and 4, in the embodiment of the present application, a button cell battery 100 includes a case 10, an electrode assembly 20 and a sealing member 30, the case 10 has a receiving cavity 11 therein, the electrode assembly 20 is located in the receiving cavity 11, and the case 10 is provided with a liquid injection hole 50 for injecting an electrolyte into the receiving cavity 11; the outer surface of the shell 10 is provided with a concave part 60, the concave part 60 is concave towards the inner side of the accommodating cavity 11, and the concave part 60 is positioned at the orifice 51 of the liquid injection hole 50 and is communicated with the liquid injection hole 50; the sealing member 30 is welded to the outside of the case 10 to cover the recess 60 and the pour hole 50.

In the above-described embodiment, by providing the recessed portion 60 at the orifice 51 of the pour hole 50 and opening the mouth of the recessed portion 60 toward the outside of the case 10, the electrolyte remaining near the orifice 51 of the pour hole 50 is accommodated in the recessed portion 60 after the electrolyte is poured, and does not adhere to the weld region on the outer surface of the case 10, so that the welding operation of the sealing member 30 and the case 10 is not affected, and the sealing performance of the welding is not affected, and therefore, the safety and stability of the button cell 100 are both good.

In addition, due to the recess 60 provided at the orifice 51 of the pour hole 50, the sealing member 30 is welded to the case 10 at a greater distance from the central axis of the pour hole 50 than in the prior art with only the pour hole 50, which is more advantageous for the welding operation.

Among them, the button cell is a cell with an external dimension like a button, and generally has a large diameter and a thin thickness, so the button cell classifies the cell from the external dimension. In the present application, the housing 10 may be a metal housing, and the cross-sectional shape of the housing 10 is not limited to a circle, but may be an ellipse, a polygon, or the like. The following examples illustrate button cells 100 as lithium ion batteries.

In the present embodiment, referring to fig. 2 and 3, the electrode assembly 20 may include a jelly roll 24, a first tab 25 and a second tab 26, the jelly roll 24 includes a first pole piece 21, a second pole piece 22, a separation film 23 for separating the first pole piece 21 from the second pole piece 22, and the like. Specifically, the winding core 24 may be a cylindrical winding body and disposed in the accommodating chamber 11, the accommodating chamber 11 also accommodates the electrolyte, the first pole piece 21 and the second pole piece 22 are separated by the separation film 23 and wound, and a hollow portion 241 may be disposed in a central portion of the winding core 24. It is understood that the end face insulating paste 242 may be provided at the top end portion and the bottom end portion of the winding core 24, respectively.

A first tab 25 is electrically connected to a position on the first pole piece 21 close to the winding periphery, a second tab 26 is electrically connected to a position on the second pole piece 22 close to the winding periphery, the first tab 25 and the second tab 26 can be respectively led out from two end sides of the winding core 24, and an included angle between a connecting line of the first tab 25 and the second tab 26 and a center of the winding core 24 is greater than 0 ° and less than 180 °, for example, may be between 90 ° and 180 °. The electrolyte can be injected into the case 10 through an injection hole 50 provided in the case 10.

In the above solution, the recessed portion 60 is recessed toward the inside of the accommodating cavity 11, that is, the depth direction of the recessed portion 60 is directed from the outside of the accommodating cavity 11 to the inside; and the recessed portion 60 being located at the orifice 51 of the pour spout 50 and communicating with the pour spout 50 means that the recessed portion 60 is located at the edge of the orifice 51 of the pour spout 50 and is open to the outside of the casing 10.

The first and second pole pieces 21, 22 may both be coated with a battery active material. Protective glue may be further attached to the surfaces of the first and second tabs 25 and 26, respectively.

In the embodiment of the present application, in order to prevent the welding operation from being affected in the entire circumferential direction of the liquid injection hole 50, the recessed portion 60 may surround the orifice 51 in the circumferential direction of the liquid injection hole 50, so that the recessed portion 60 forms a counter-bore structure, and the counter-bore structure is also provided for easy processing.

Optionally, the diameter of the liquid injection hole 50 may be 0.2 to 3mm, for example, 0.5 to 1.5mm, the diameter of the recess 60, i.e., the counter bore structure, may be 1.5 to 3.5mm, for example, 2 to 3mm, the depth of the recess 60 may be 0.01 to 0.2mm, for example, 0.05 to 0.1mm, and the cross-sectional shapes of the recess 60 and the liquid injection hole 50 may be circular or polygonal.

In the embodiment of the present application, referring to fig. 2 and 3, in an alternative embodiment, the housing 10 includes a lower housing 13 and a cover plate assembly 12, and the lower housing 13 and the cover plate assembly 12 may jointly enclose the accommodating cavity 11. The case 10 is provided in two detachable parts as described above so that the electrode assembly 20 and the like are mounted into the receiving cavity 11. Alternatively, the lower case 13 may include a bottom wall 131 and a side wall 132 surrounding the bottom wall 131, and a bottom end of the side wall 132 is connected to the bottom wall 131, so that the lower case 13 is formed to have an open cover-like structure.

In the button cell 100 of the present application, the liquid inlet 50 may be provided on the top or bottom of the case 10 as needed, and the following description will be made in each case.

Referring to fig. 2 and 3, in an alternative embodiment, the cap assembly 12 includes a cap 121 and a conductive member 122, the cap 121 is connected to the top of the lower housing 13, a through hole 1211 is formed in the cap 121, the conductive member 122 covers the through hole 1211, and the conductive member 122 is connected to the cap 121 in an insulated manner; the pour spout 50 is positioned on the conductive member 122, and the sealing member 30 is welded to the conductive member 122 to cover the recessed portion 60 and the pour spout 50. The conductive member 122 may be made of aluminum or aluminum alloy, and the top cover 121 may be made of metal, such as steel or nickel.

Here, the conductive element 122 is insulated from the top cap 121, for example, an insulating sealant, such as a hot melt PP (polypropylene) glue 123, may be disposed between the conductive element 122 and the top cap 121, so that, in a heated state, the conductive element 122 and the top cap 121 are connected by the hot melt PP glue 123, and the conductive element 122 and the top cap 121 may be insulated and sealed. On the inside wall of the top cover 121 facing the accommodating cavity 11, a casing insulating glue 124 may be further attached, where the casing insulating glue 124 is a non-metal insulating material, and the thickness may be 0.02-0.1 mm, for example, 0.03-0.05 mm.

Referring to fig. 2 and 4, which are schematic structural views of the cap assembly 12, optionally, the conductive member 122 includes a boss portion 1221, the boss portion 1221 is disposed corresponding to the through hole 1211 of the top cap 121, and the boss portion 1221 protrudes outside of the other portion of the conductive member 122 to protrude into the accommodating cavity 11 through the through hole 1211, and in addition, the first tab 25 is electrically connected to the bottom end surface of the boss portion 1221. By providing the boss 1221 on the conductive member 122 in this manner, the boss 1221 protrudes from the through hole 1211 of the top cover 121 into the accommodating chamber 11, and is electrically connected to the first tab 25. As a possible embodiment, the boss portion 1221 may be formed by, for example, punching, and the outer contour of the boss portion 1221 may be substantially the same as the contour of the edge portion of the through-hole 1211.

The conductive member 122 may further include a bridging portion 1222 disposed around the boss portion 1221, one end of the bridging portion 1222 is connected to the boss portion 1221 and protrudes away from the boss portion 1221, when the conductive member 122 is mounted, the bridging portion 1222 may be welded to the top cap 121 by the hot melt PP glue 123, and the boss portion 1221 protrudes into the receiving cavity 11 through the through hole 1211. It should be noted that the side surface of the boss 1221 is spaced from the wall of the through hole by a predetermined distance to prevent the conductive member 122 from contacting the top cap 121. At this time, the first tab 25 may directly contact the boss portion 1221, that is, the conductive member 122 and the first tab 25 are electrically connected. The second tab 26 may be welded directly to the inner side wall of the bottom of the casing 10, and the welding point may correspond to the central position of the winding core 24.

The first tab 25 and the land 1221 can be soldered to each other and form a second solder print 126, and the second solder print 126 can be located on the side of the conductive element 122 facing away from the sealing element 30, i.e. in fig. 2, the second solder print 126 is located on the upper surface of the conductive element 122.

And the sealing member 30 and the conductive member 122 may be welded to each other to form a first solder mark 125, and the first solder mark 125 may be located on a side of the conductive member 122 facing the sealing member 30, that is, in fig. 2, the first solder mark 125 is located on a lower surface of the conductive member 122. In this way, the first weld mark 125 is located on one side of the sealing member 30, and the weld mark is not visible from the appearance of the sealing member 30, which can enhance the aesthetic appearance of the button cell.

Here, the first solder mark 125 and the second solder mark 126 may be staggered, which can improve the flatness of the whole button cell and make the button cell more beautiful.

Alternatively, the first solder mark 125 and the second solder mark 126 may overlap each other. Thus, when welding, the first welding stamp 125 and the second welding stamp 126 can be fused with each other, which can enhance the firmness of welding, so that the reliability of the button cell is higher.

With continued reference to fig. 4, the projecting end face of the boss portion 1221 is located at a height relative to the bottom of the lower case 13 that is lower than the height at which the bottom end face of the top cover 121, i.e., the setting height h1 of the bottom end face of the boss portion 1221, i.e., the projecting end face, is located relative to the bottom of the lower case 13, that is, the setting height h2 of the bottom end face of the top cover 121 relative to the bottom of the lower case 13. In this way, the first tab 25 can be welded directly on the bottom end face of the boss portion 1221 without contacting the inner wall of the lower case 13. Of course, in the case where the case insulating paste 124 is provided on the bottom end surface of the top cover 12, the bottom end surface of the insulating paste 124, that is, the bottom end surface of the top cover 121, can be considered.

Alternatively, referring to fig. 2, a mounting groove 1223 may be further formed on a surface of the conductive member 122 facing away from the boss portion 1221, the mounting groove 1223 corresponds to the boss portion 1221, and the liquid injection hole 50 may be located at a bottom of the mounting groove 1223, so that the sealing member 30 may be mounted in the mounting groove 1223. Through setting up the mounting groove 1223 that can hold sealing member 30, sealing member 30 can not bulge in button cell 100's surface like this, and the outward appearance is comparatively good, and secondly mounting groove 1223 is located the position that corresponds with the boss, can make full use of boss portion 1221 partial protrusion height like this, makes the thickness of whole electrically conductive piece 122 comparatively even.

Fig. 5 is a schematic cross-sectional view of another structure of a battery provided in an embodiment of the present application, fig. 6 is a schematic cross-sectional view of another structure of a battery provided in an embodiment of the present application, and fig. 7 is a schematic overall structure of another structure of a battery provided in an embodiment of the present application. The button cell 200 of the present embodiment, which has been described with reference to fig. 5, 6, and 7, changes the position of the pour hole, the structure of the conductive member, and the installation position of the sealing member based on the above embodiment. The rest of the structure is similar to the structure shown in fig. 2 and 3, and the description is omitted here.

As described above, the lower case 13 includes the bottom wall 131 and the side wall 132 surrounding the bottom wall 131, and the bottom end of the side wall 132 is connected to the bottom wall 131. in contrast to the above, the pour hole 70 is located on the bottom wall 131, and the sealing member 71 is welded to the bottom wall 131 to cover the pour hole 70.

In an alternative embodiment, the cover assembly 12 includes a top cover 121 and a conductive member 72, the top cover 121 is connected to the top end of the sidewall 132, a through hole 1211 is formed on the top cover 121, the conductive member 72 covers the through hole 1211, and the conductive member 72 is connected to the top cover 121 in an insulated manner; the electrode assembly 20 includes a first tab 25 and a second tab 26, the first tab 25 being welded to the conductive member 72, and the second tab 26 being welded to the bottom wall 131.

In the case where the pour hole 70 is provided in the bottom wall 131, the welding point a of the sealing member 71 and the bottom wall 131 is located at a position on the bottom wall 131 close to the sealing member 71, while the welding point B of the bottom wall 131 and the second tab 26 may be located at other positions so as to be away from the position of the welding point a, so that overlapping of two welding points is avoided, and the flatness of the appearance of the entire button cell can be increased. And for the first tab 25, it may be welded directly to the conductive member 72.

It will be appreciated that the bottom mounting recess 74 may be formed in the outer surface of the bottom wall 131, and the pour hole 70 may be located at the bottom of the bottom mounting recess 74. The bottom mounting groove 74 is configured to receive the sealing member 71 such that the sealing member 71 is mounted in the bottom mounting groove 74. Here, by providing the bottom mounting groove 74 capable of accommodating the sealing member 71, the sealing member 71 does not protrude from the surface of the button cell 100, and the appearance is better.

In the button cell of this application, electrolyte pours into in the well kenozooecium of rolling up the core from liquid filling hole department, and the depressed part is used for storing remaining electrolyte, annotates liquid hole and depressed part after annotating the liquid, and through circumference overlap joint, and the welding line is sealed, certainly, can make sealing and annotate approximate coaxial setting between the liquid hole.

In the embodiment of the application, the button cell comprises a shell, an electrode assembly and a sealing piece, wherein the shell is internally provided with an accommodating cavity, the electrode assembly is positioned in the accommodating cavity, and the shell is provided with a liquid injection hole for injecting electrolyte into the accommodating cavity; the outer surface of the shell is provided with a sunken part which is sunken to the inner side of the accommodating cavity, and the sunken part is positioned at the orifice of the liquid injection hole and is communicated with the liquid injection hole; the sealing piece is welded on the outer side of the shell to seal the concave part and the liquid injection hole. In the above scheme, the recessed part is arranged at the orifice of the liquid injection hole, and the opening part of the recessed part is opened towards the outer side of the shell, so that the electrolyte remained near the orifice of the liquid injection hole can be accommodated in the recessed part and cannot be attached to the outer surface of the shell after the electrolyte is injected, the welding operation of the sealing piece and the shell cannot be influenced, the welding tightness cannot be influenced, and the safety and the stability of the button cell are better.

The utility model also provides an electronic equipment, include: the electronic equipment comprises an electronic equipment body and a battery, wherein the battery provides electric energy for the electronic equipment body.

Wherein, the utility model provides a structure of battery among the electronic equipment with above the structure of battery the same to can bring the same or similar technological effect, no longer give unnecessary details here.

In the description of the present invention, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through an intermediary, a connection between two elements, or an interactive relationship between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. The battery is characterized by comprising a shell, an electrode assembly and a sealing piece, wherein the shell is internally provided with an accommodating cavity, the electrode assembly is positioned in the accommodating cavity, and the shell is provided with a liquid injection hole for injecting electrolyte into the accommodating cavity;

the outer surface of the shell is provided with a sunken part which is sunken towards the inner side of the accommodating cavity, and the sunken part is positioned at the orifice of the liquid injection hole and communicated with the liquid injection hole; the sealing piece is welded on the outer side of the shell to seal the concave part and the liquid injection hole.

2. The battery according to claim 1,

the sunken part surrounds the hole opening along the circumferential direction of the liquid injection hole, so that the sunken part forms a counter bore structure.

3. The battery according to claim 1 or 2,

the shell comprises a lower shell and a cover plate assembly, and the lower shell and the cover plate assembly jointly enclose the accommodating cavity;

the cover plate assembly comprises a top cover and a conductive piece, the top cover is connected to the top of the lower shell, a through hole is formed in the top cover, the conductive piece covers the through hole, and the conductive piece is in insulated connection with the top cover;

the liquid injection hole is located on the conductive piece, and the sealing piece is welded on the conductive piece to seal the concave part and the liquid injection hole.

4. The battery according to claim 3,

the conductive piece comprises a boss part, the boss part is arranged corresponding to the through hole of the top cover, and the boss part protrudes out of the other parts of the conductive piece so as to extend into the accommodating cavity through the through hole;

the electrode assembly includes a first tab electrically connected to the boss portion.

5. The battery according to claim 4,

the sealing piece and the conductive piece are welded with each other to form a first welding mark, and the first welding mark is positioned on one surface, facing the sealing piece, of the conductive piece; the first electrode lug and the boss part are welded and connected with each other, and a second welding mark is formed and is positioned on one surface, away from the sealing piece, of the conductive piece;

the first welding impression and the second welding impression are staggered; or

The first and second solder impressions overlap one another.

6. The battery according to claim 4,

the height of the convex end surface of the boss portion relative to the bottom of the lower shell is lower than the height of the bottom end surface of the top cover.

7. The battery according to claim 4,

deviating from on the electrically conductive piece be equipped with the mounting groove in the one side of boss portion, the mounting groove with the boss corresponds, annotate the liquid hole and be located the tank bottom of mounting groove, sealing member install in the mounting groove.

8. The battery according to claim 1 or 2,

the shell comprises a lower shell and a cover plate assembly, and the lower shell and the cover plate assembly jointly enclose the accommodating cavity;

the lower shell comprises a bottom wall and a side wall surrounding the bottom wall, the bottom end of the side wall is connected with the bottom wall, the liquid injection hole is located in the bottom wall, and the sealing piece is welded on the bottom wall to seal the liquid injection hole.

9. The battery according to claim 8,

the cover plate assembly comprises a top cover and a conductive piece, the top cover is connected to the top end of the side wall, a through hole is formed in the top cover, the conductive piece covers the through hole, and the conductive piece is in insulated connection with the top cover; the electrode assembly comprises a first tab and a second tab, the first tab is welded with the conductive piece, and the second tab is welded with the bottom wall.

10. An electronic device comprising an electronic device body and the battery according to any one of claims 1 to 9, the battery supplying electric power to the electronic device body.

Images