CN113809482A

CN113809482A - Battery and method for producing battery

Info

Publication number: CN113809482A
Application number: CN202111078795.4A
Authority: CN
Inventors: 厉成北; 王智峰; 章辉; 彭宁
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2021-12-17

Abstract

The application provides a battery and a preparation method of the battery, and belongs to the field of batteries. The battery comprises a shell and a winding core, wherein the shell comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover covers the opening, the shell cover and the shell body jointly form an accommodating cavity, and the winding core is positioned in the accommodating cavity. Be provided with on the cap and annotate the liquid hole, have a roll core chamber in rolling up the core, roll up and be connected with at least one first utmost point ear on the core, first utmost point ear is located and rolls up between the inner bottom wall of core and casing, annotates the projection of liquid hole on the inner bottom wall of casing, the projection of rolling up the core chamber on the inner bottom wall of casing and the projection of first utmost point ear on the inner bottom wall of casing at least partial coincidence. The surface of the first tab, which is close to one side of the inner bottom wall of the shell, is welded with the inner bottom wall of the shell, and a first welding seam is formed on the outer bottom wall of the shell. The battery and the preparation method of the battery can achieve the purpose of improving the service performance of the battery.

Description

Battery and method for producing battery

Technical Field

The application relates to the technical field of batteries, in particular to a battery and a preparation method of the battery.

Background

Among the batteries, the button battery has been widely used in various miniature electronic products because of its small size.

The button cell comprises a shell, a shell cover assembly matched with the shell and a winding core placed in the shell. The coil core is welded with the negative electrode lug and the positive electrode lug, the coil core is welded on the shell cover assembly through the positive electrode lug, the coil core is welded on the bottom wall of the shell through the negative electrode lug, then the shell is closed and packaged, and sealing test is carried out, so that the button cell is prepared. In the related art, the welding mode between the negative electrode lug and the bottom wall of the shell is to weld the negative electrode lug and the bottom wall of the shell together through the inner cavity of the winding core, however, welding slag splashing and high temperature are generated in the process, and the welding slag splashing and high temperature can damage the inner cavity of the winding core.

Therefore, the above welding method may result in poor battery performance.

Disclosure of Invention

In order to solve at least one of the problems mentioned in the background art, the present application provides a battery and a method of manufacturing the battery, which can achieve the object of improving the use performance of the battery.

In order to achieve the above object, in a first aspect, the present application provides a battery including a case and a winding core, the case includes a housing body and a case cover, the housing body has an opening, the case cover covers the opening, the case cover and the housing body together form a receiving cavity, and the winding core is located in the receiving cavity.

Be provided with on the cap and annotate the liquid hole, it has a core chamber to roll up in the core, it is connected with at least one first utmost point ear to roll up on the core, first utmost point ear is located roll up the core with between the inner bottom wall of casing, it is in to annotate the liquid hole the projection on the inner bottom wall of casing the core chamber is in projection on the inner bottom wall of casing and first utmost point ear is in projection at least partial coincidence on the inner bottom wall of casing.

The surface of the first tab, which is close to one side of the inner bottom wall of the shell, is welded with the inner bottom wall of the shell, and a first welding seam is formed on the outer bottom wall of the shell.

As a possible implementation, the shape of the first weld is a point shape, a circle shape, a spiral point shape, a spiral line shape, an arc shape, a cross shape or a meter shape.

As a possible realization, a weld region is formed on the outer bottom wall of the housing in the projection of the first tab on the bottom wall of the housing, the first weld seam being located in the weld region.

As a possible implementation manner, the welding area is circular, and the diameter of the circular welding area is 1-3 mm; and/or the distance between the welding area and the edge of the shell is 3.5-6 mm.

As a possible realization, the thickness of the bottom wall of the casing is 0.05-0.3 mm; and/or the value range of the penetration of the first welding line is 0.06-0.4 mm; and/or the value range of the welding seam surplus height of the first welding seam is 0.02-0.1 mm.

As a possible implementation manner, the case cover comprises a first conductive piece, a second conductive piece and an insulating piece positioned between the first conductive piece and the second conductive piece, wherein the first conductive piece is welded with the end part of one side of the case body far away from the bottom wall, and a second welding line is formed; the first conductive piece is provided with a first through hole, and the second conductive piece is connected with the second pole lug.

As a possible implementation manner, the second electrically conductive piece is close to the one side of first electrically conductive piece is provided with the metal boss, at least part the metal boss extends to in the first through-hole, and with the second utmost point ear is connected, be provided with on the second electrically conductive piece and annotate the liquid hole, it runs through to annotate the liquid hole the metal boss, and with roll up core chamber intercommunication.

As a possible implementation, the second weld is arranged along a circumferential direction of an edge of the shell cover; the melting width of the second welding line ranges from 0.2mm to 0.3 mm; and/or the value range of the penetration of the second welding line is 0.05-0.15 mm.

As a possible implementation manner, the winding core is further connected with the second tab, the second tab is welded with the second conductive piece, and a space exists between the welding position of the second tab and the second conductive piece and the liquid injection hole; wherein the first tab and the second tab have opposite polarities.

As a possible implementation manner, the value ranges of the thickness of the first tab and the thickness of the second tab are both 0.03-0.15 mm; and/or the width of the first tab and the width of the second tab both range from 2mm to 4 mm; and/or the diameter range of the liquid injection hole is 1-2 mm.

In a second aspect, the present application also provides a method for manufacturing a battery, including:

a can and a roll core are provided. The shell comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover covers the opening, the shell cover and the shell body jointly form an accommodating cavity, and the winding core is located in the accommodating cavity.

And welding the shell and the first lug from the side of the outer bottom wall of the shell, and forming a first welding seam on the outer bottom wall of the shell. Wherein, before the first welding seam is formed, the shell cover is welded with the end part of the side of the shell body far away from the bottom wall, and a second welding seam is formed.

Compared with the related art, the beneficial effects of the application are that:

this application is through improving the welding mode between casing and the first utmost point ear among the correlation technique, be about to through the mode of rolling up core chamber welding casing and first utmost point ear, and the adjustment is for carrying out the welded mode to casing and first utmost point ear through the outer diapire of casing to in this welding mode of eliminating correlation technique, the welding slag splashes, the influence of heat and remaining welding slag to rolling up the core chamber, thereby realizes improving the purpose of the performance of battery.

The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded view of a battery (without a closure cap) provided in an embodiment of the present application;

fig. 2 is a bottom view of a battery provided in accordance with an embodiment of the present application having a first weld;

fig. 3 is a bottom view of a battery provided in accordance with an embodiment of the present application having an alternative first weld;

fig. 4 is a bottom view of a battery provided in accordance with an embodiment of the present application having an alternative first weld;

fig. 5 is a bottom view of a battery provided in accordance with an embodiment of the present application having an alternative first weld;

fig. 6 is a bottom view of a battery provided in accordance with an embodiment of the present application having an alternative first weld;

fig. 7 is a bottom view of a battery provided in accordance with an embodiment of the present application having an alternative first weld;

fig. 8 is a bottom view of a battery provided in accordance with an embodiment of the present application having an alternative first weld;

fig. 9 is an assembly view of a battery (without a sealing cover) provided in an embodiment of the present application;

FIG. 10 is a cross-sectional view taken along line A-A of FIG. 9;

FIG. 11 is an enlarged view of a portion of FIG. 10 at B;

FIG. 12 is an enlarged view of a portion of FIG. 10 at C;

fig. 13 is an exploded view of a cover of a battery according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a cover of a battery provided in an embodiment of the present application in an open state;

fig. 15 is an assembly view of a battery (provided with a capping) according to an embodiment of the present application;

fig. 16 is a flowchart of a method for manufacturing a battery provided in an embodiment of the present application;

fig. 17 is a flowchart showing a specific operation step of step S100 in fig. 16.

Description of reference numerals:

100-a housing;

110-a housing;

111-opening; 112-first weld; 113-a welding area;

120-a shell cover;

121-liquid injection hole; 122-a first electrically conductive member; 123-a second conductive member; 124-an insulator; 125-second weld;

130-a containing cavity;

140-a blocking cover;

200-a winding core;

210-a core winding cavity; 220-a first tab; 230-second pole ear.

Detailed Description

The button cell comprises a shell, a shell cover assembly matched with the shell and a winding core placed in the shell. The coil core is welded with the negative electrode lug and the positive electrode lug, the coil core is welded on the shell cover assembly through the positive electrode lug, the coil core is welded on the bottom wall of the shell through the negative electrode lug, then the shell is closed and packaged, and sealing test is carried out, so that the button cell is prepared. In the related art, the negative tab and the bottom wall of the can are usually welded by passing a welding pin or a laser beam through the cavity inside the winding core, but such welding has the following disadvantages: the heat and welding slag splash in the welding process can affect the inner cavity of the winding core. Specifically, the heat in the welding process can melt the core winding cavity of the core, and welding slag generated in the welding process splashes and remains in the core winding cavity after the welding process is finished, so that the use performance of the battery is poor.

Based on the technical problem, the application provides a battery and a preparation method of the battery, wherein a shell cover covers an opening of a shell, so that the shell cover and the shell together form an accommodating cavity, a winding core is positioned in the accommodating cavity, a first tab connected to the winding core is positioned between the winding core and an inner bottom wall of the shell, and a projection of a liquid injection hole in the shell cover on the inner bottom wall of the shell, a projection of the winding core cavity in the winding core on the inner bottom wall of the shell and a projection of the first tab on the inner bottom wall of the shell are at least partially overlapped; the surface of the first tab, which is close to one side of the inner bottom wall of the shell, is welded with the inner bottom wall of the shell, and a first welding seam is formed on the outer bottom wall of the shell, so that the aim of improving the service performance of the battery is fulfilled.

In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Example one

Fig. 1 is an exploded view of a battery (without a cap) according to an embodiment of the present application. Fig. 2 is a bottom view of a battery having a first weld provided in accordance with an embodiment of the present disclosure. Fig. 3 is a bottom view of a battery provided in an embodiment of the present application having another first weld. Fig. 4 is a bottom view of a battery provided in an embodiment of the present application having another first weld. Fig. 5 is a bottom view of a battery provided in an embodiment of the present application having an alternative first weld. Fig. 6 is a bottom view of a battery provided in an embodiment of the present application having an alternative first weld. Fig. 7 is a bottom view of a battery provided in an embodiment of the present application having an alternative first weld. Fig. 8 is a bottom view of a battery provided in an embodiment of the present application having an alternative first weld.

Fig. 9 is an assembly view of a battery (without a sealing cover) provided in an embodiment of the present application. Fig. 10 is a sectional view taken along the line a-a of fig. 9. Fig. 11 is a partial enlarged view of fig. 10 at B. Fig. 12 is a partial enlarged view at C in fig. 10. Fig. 13 is an exploded view of a cover of a battery according to an embodiment of the present invention. Fig. 14 is a schematic structural diagram of a cover of a battery provided in an embodiment of the present application in an open state. Fig. 15 is an assembly view of a battery (provided with a capping) according to an embodiment of the present application.

The first embodiment of the present application provides a battery, which is shown in fig. 1 to 8, and includes a housing 100 and a winding core 200, where the housing 100 includes a casing 110 and a casing cover 120, the casing 110 has an opening 111, the casing cover 120 covers the opening 111, the casing cover 120 and the casing 110 together form an accommodating cavity 130, and the winding core 200 is located in the accommodating cavity 130.

The case cover 120 is provided with a liquid injection hole 121, the core 200 is provided with a core cavity 210 therein, the core 200 is connected with at least one first tab 220, the first tab 220 is located between the core 200 and the inner bottom wall of the case 110, and the projection of the liquid injection hole 121 on the inner bottom wall of the case 110, the projection of the core cavity 210 on the inner bottom wall of the case 110 and the projection of the first tab 220 on the inner bottom wall of the case 110 are at least partially overlapped.

The surface of the first tab 220 adjacent to the inner bottom wall of the casing 110 is welded to the inner bottom wall of the casing 110, and a first weld 112 is formed on the outer bottom wall of the casing 110.

In this embodiment, the battery case 100 includes a case 110 and a case cover 120, wherein the case 110 is made of stainless steel, the case 110 is a hollow cylinder with an opening 111 at one end, and the case cover 120 is a circular cover body adapted to the structure and shape of the case 110. The winding core 200 is placed in the accommodating cavity 130 formed by the shell cover 120 and the shell 110, wherein the shape of the inner cavity of the accommodating cavity 130 is matched with the shape of the winding core 200, and the shape of the winding core 200 is slightly smaller than the size of the inner cavity of the accommodating cavity 130, so that the winding core 200 cannot shake due to a large installation gap when placed in the accommodating cavity 130, and the winding core 200 can be stably and reliably installed in the accommodating cavity 130 due to the structural design.

It should be noted that in the present embodiment, the casing cover 120 is provided with the liquid injection hole 121, and the purpose of the liquid injection hole 121 is mainly to reserve a pouring opening for the electrolyte for the subsequent process, specifically, after the casing cover 120 is covered on the casing body 110, the electrolyte can be added into the core cavity 210 in the core 200 through the reserved liquid injection hole 121.

In addition, at least one first tab 220 is connected to the winding core 200, for example, one first tab 220 is connected to the winding core 200, or two or more first tabs 220 may be connected, and the performance requirement of the battery is specifically selected reasonably, which is not limited in this embodiment. Here, the first tab 220 may be a positive tab or a negative tab, which is not limited in this embodiment, but it should be noted that other structures in the battery are adjusted correspondingly according to whether the first tab 220 is the positive tab or the negative tab, so that the battery structure can meet the use requirement after the preparation is completed.

Wherein a portion of the first tab 220 is connected to the winding core 200, and another portion is located between the winding core 200 and the inner bottom wall of the case 110. The projection of the liquid injection hole 121 on the inner bottom wall of the case body 110, the projection of the winding core cavity 210 on the inner bottom wall of the case body 110, and the projection of the first tab 220 on the inner bottom wall of the case body 110 at least partially coincide, and for example, the projection area of the first tab 220 on the inner bottom wall of the case body 110, the projection of the winding core cavity 210 on the inner bottom wall of the case body 110, and the projection of the liquid injection hole 121 on the inner bottom wall of the case body 110 may be sequentially reduced. The main purpose of this is to facilitate the filling of the electrolyte, and to enable the electrolyte in the winding core cavity 210 of the battery to be in electrical contact with the first tab 220.

Specifically, the projection of the liquid inlet 121 on the inner bottom wall of the casing 110 and the projection of the winding core chamber 210 on the inner bottom wall of the casing 110 at least partially overlap each other to enable the electrolyte to be smoothly poured into the winding core chamber 210 through the liquid inlet 121. The projection of the winding core cavity 210 on the inner bottom wall of the casing 110 and the projection of the first tab 220 on the inner bottom wall of the casing 110 are at least partially overlapped, which mainly aims to enable the electrolyte in the winding core cavity 210 to be in good electrical contact with the first tab 220, so as to prevent the situation that the electrolyte in the winding core cavity 210 cannot be in electrical contact with the first tab 220 to cause the abnormal use of the battery.

Wherein the first tab 220 is welded to the bottom wall of the case 110. Specifically, the first tab 220 and the bottom wall of the housing 110 are welded together by performing a welding operation on the outer wall of the housing 110, and finally the first weld 112 is formed on the outer bottom wall of the housing 110.

Regarding the shape of the first weld 112, there are seven implementations:

as a first possible implementation, referring to fig. 2, the shape of the first weld 112 is a point shape.

In this embodiment, the first welding seam 112 is in the form of a spot, that is, the first tab 220 and the inner bottom wall of the casing 110 are welded together by spot welding, and when the first welding seam 112 is in the form of a spot, the influence on the structures of the inner bottom wall of the casing 110 and the first tab 220 is small, compared to other welding methods, and therefore, the appearance of the casing 110 can be maintained as beautiful as possible.

As a second possible implementation, referring to fig. 3, the first weld 112 is circular in shape.

It should be noted that, in the embodiment, the shape of the first welding seam 112 is a circle, and compared with the case that the first welding seam 112 is a point shape, because the area of the circle is larger than that of the point shape, the welding strength in this welding manner is higher, that is, the welding between the inner bottom wall of the housing 110 and the first tab 220 is firmer and more reliable.

As a third possible implementation, referring to fig. 4, the shape of the first weld 112 is a spiral point shape.

It should be noted that, in the present embodiment, the shape of the first welding seam 112 is a spiral point shape, and as can be seen from fig. 4, because this way is a spiral shape formed by connecting a plurality of welding points, the density of the spiral shape can be flexibly adjusted, and compared with the case that the first welding seam 112 is a circular shape, when the first welding seam 112 is a spiral point shape within the same welding area, the density of the first welding seam 112 is greater than the density of the first welding seam 112 being a circular shape, so the welding strength in this way is higher, that is, the welding between the inner bottom wall of the housing 110 and the first tab 220 is firmer and more reliable.

As a fourth possible implementation, referring to fig. 5, the first weld 112 has a spiral shape.

It should be noted that, in the embodiment, the shape of the first welding seam 112 is a spiral line, and compared with the case that the welding track is composed of a plurality of welding points when the shape of the first welding seam 112 is a spiral point, the welding track of the welding method is continuous, so that the welding method is convenient to operate, thereby saving the labor time and improving the labor efficiency.

As a fifth possible implementation, referring to fig. 6, the first weld 112 is arc-shaped.

It should be noted that, in the embodiment, when the shape of the first welding seam 112 is an arc, on one hand, compared with when the shape of the first welding seam 112 is a spiral shape, the welding track of the welding manner is simple and is easier to operate; on the other hand, the welding strength is higher when the welding strength is weaker than when the first weld 112 is point-shaped, in which the connection between the case 110 and the first tab 220 is point-connected.

As a sixth possible implementation, referring to fig. 7, the first weld 112 has a cross shape.

It should be noted that, in the embodiment, when the first welding seam 112 is in the shape of a cross, because two mutually perpendicular trajectories of the cross are both linear, the welding manner is simple and convenient, and the welding strength is better than that when the first welding seam 112 is in the shape of a point.

As a seventh possible implementation manner, referring to fig. 8, the shape of the first welding seam 112 is a meter-shaped seam.

In the embodiment, when the first welding seam 112 is in a shape of a cross, the welding strength between the housing 110 and the first tab 220 is higher and the welding between the housing 110 and the first tab 220 is more reliable than when the first welding seam 112 is in a shape of a cross.

It should be noted that the shape of the first welding seam 112 formed on the outer bottom wall of the housing 110 is not limited to the above seven cases, and the present embodiment does not limit this. It should be emphasized that, in the welding process of the housing 110 and the first tab 220, no matter which welding shape is adopted, the influence of the complexity of the welding process on the labor efficiency and the influence of the complexity of the welding track on the welding strength need to be comprehensively considered.

As a possible implementation, referring to fig. 2 to 8, the projection of the first tab 220 on the outer bottom wall of the casing 110 forms a welding area 113, and the first weld 112 is located in the welding area 113.

It should be noted that, in the present embodiment, the welding region 113 is formed on the outer bottom wall of the casing 110 in the projection of the first tab 220 on the bottom wall of the casing 110, that is, the welding region 113 is located in the projection of the first tab 220 on the outer bottom wall of the casing 110, and the first weld seam 112 is located in the welding region 113, so as to ensure that, no matter what shape the first weld seam 112 takes, as long as the first weld seam 112 is located in the welding region 113, reliable welding can be ensured between the inner bottom wall of the casing 110 and the first tab 220, and a situation that a cold joint is generated between the casing 110 and the first tab 220 due to an improper selection of a welding position of the first weld seam 112 is prevented.

As a possible implementation, with reference to fig. 2 to 8, the welding area 113 is circular and the diameter of the circular welding area 113 (indicated by D1 in fig. 2 to 8) is 1-3 mm.

It should be noted that, in this embodiment, the welding area 113 is circular, and compared with the other shapes such as a square shape, a triangular shape, or a polygonal shape, which are selected for the welding area 113, the arrangement is more convenient to constrain the first welding seams 112 to be arranged in an even and symmetrical manner in this area, so that the welding strength between the inner bottom wall of the housing 110 and the first tab 220 is higher, and the welding seams are more evenly distributed. The diameter of the welding area 113 is 1-3mm, for example, the diameter of the welding area 113 may be 1mm, 1.5mm, 2mm, 2.5mm, or 3mm, or may be any value between 1-3mm, which is not limited in this embodiment. The specific value of the diameter of the welding region 113 can be flexibly selected according to the size of the first tab 220 and the requirement for the welding strength between the housing 110 and the first tab 220 in the actual welding process.

As a possible implementation, referring to fig. 2 to 8, the distance between the welding area 113 and the edge of the shell 110 (denoted by a in fig. 2 to 8) is 3.5-6 mm.

It should be noted that, in this embodiment, the distance between the welding region 113 and the edge of the housing 110 is 3.5 to 6mm, and exemplarily, the distance between the welding region 113 and the edge of the housing 110 may be 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm or 6mm, or may be any value between 3.5 to 6mm, which is not limited in this embodiment. The specific value of the distance between the welding area 113 and the edge of the shell 110 can be flexibly selected by comprehensively considering the size of the outer diameter dimension of the shell 110 in the actual welding process, the welding strength requirement and the influence of the welding track on the appearance.

As a possible implementation, referring to fig. 10, the thickness of the bottom wall of the housing 110 (denoted by b in fig. 10) is 0.05-0.3 mm.

In this embodiment, the thickness of the bottom wall of the housing 110 is limited to 0.05-0.3mm, and for example, the thickness of the bottom wall of the housing 110 may be 0.05mm, 0.1mm, 0.2mm, or 0.3mm, or may be any value between 0.05-0.3mm, which is not limited in this embodiment. Here, the thickness of the bottom wall of the housing 110 is defined, and on one hand, the risk of insufficient supporting strength of the housing 110 due to too thin bottom wall of the housing 110 can be reduced; on the other hand, the problem that the energy density of the battery is influenced due to the fact that the inner space of the whole battery is too small because the bottom wall of the shell 110 is too thick can be avoided; it is also possible to avoid the problem that the use requirement of the battery cannot be satisfied due to the increase in the height and weight of the entire battery caused by the excessive thickness of the bottom wall of the case 110.

As a possible implementation, referring to FIG. 11, the penetration of the first weld 112 (denoted by c in FIG. 11) may range from 0.06mm to 0.4 mm.

It should be noted that, in this embodiment, the penetration of the first welding seam 112 is in a range of 0.06-0.4mm, and exemplarily, the penetration of the first welding seam 112 may be 0.06mm, 0.1mm, 0.2mm, 0.3mm, or 0.4mm, or may be any value between 0.06mm and 0.4mm, which is not limited in this embodiment. The penetration depth of the first welding seam 112 is limited, and the main purpose is to ensure that the penetration depth of the first welding seam 112 is slightly larger than the thickness of the bottom wall of the casing 110 under the condition that the thickness of the bottom wall of the casing 110 is constant, so that on one hand, the situation that the penetration depth of the first welding seam 112 is too small to weld through the bottom wall of the casing 110 and further weld the casing and the first tab 220 cannot be realized can be avoided; on the other hand, the first tab 220 can be prevented from being welded through due to the excessive penetration of the first weld seam 112, and the risk of welding through the first tab 220 is further reduced.

As a possible implementation manner, referring to fig. 11, the weld reinforcement height (denoted by d in fig. 11) of the first weld 112 is in a range of 0.02-0.1 mm.

It should be noted that, in this embodiment, a value of the weld reinforcement of the first weld 112 is in a range of 0.02-0.1mm, and exemplarily, the weld reinforcement of the first weld 112 may be 0.02mm, 0.04mm, 0.06mm, 0.08mm, or 0.1mm, or may be any value between 0.02-0.1mm, which is not limited in this embodiment. Here, the weld reinforcement of the first weld 112 is defined, which is to flatten the outer bottom wall of the housing 110, and avoid uneven outer bottom wall of the housing 110 caused by too large weld reinforcement of the first weld 112; on the other hand, the weld margin of the first weld 112 cannot be too small, which may result in insufficient welding strength between the inner bottom wall of the housing 110 and the first tab 220.

As one possible implementation manner, referring to fig. 13, the case cover 120 includes a first conductive member 122, a second conductive member 123, and an insulating member 124 located between the first conductive member 122 and the second conductive member 123, wherein, referring to fig. 9, the first conductive member 122 is welded to an end of the side of the case body 110 away from the bottom wall, and a second welding seam 125 is formed; the first conductive member 122 has a first through hole, and the second conductive member 123 is connected to the second tab 230.

A metal boss is arranged on one surface of the second conductive member 123 close to the first conductive member 122, at least part of the metal boss extends into the first through hole and is connected with the second pole lug 230, a liquid injection hole 121 is arranged on the second conductive member 123, and the liquid injection hole 121 penetrates through the metal boss and is communicated with the winding core cavity 210.

In this embodiment, the first conductive member 122, the casing 110 and the first tab 220 are welded in sequence to form a first electrode of the battery. The second conductive member 123 is welded to a second tab 230 for forming a second electrode of the battery, wherein the second tab 230 is welded to a metal boss of the second conductive member 123. It should be noted that one of the first electrode and the second electrode may serve as a positive electrode of the battery, and the other of the first electrode and the second electrode may serve as a negative electrode of the battery. Here, the insulating member 124 is located between the first conductive member 122 and the second conductive member 123, and may be made of an insulating adhesive. The insulating member 124 is provided to electrically insulate the first conductive member 122 from the second conductive member 123, and to prevent adverse effects on battery performance due to short circuit between the first conductive member 122 and the second conductive member 123.

As one possible implementation, referring to fig. 9, the second welding seam 125 is arranged in a circumferential direction of the edge of the housing cover 120. Referring to fig. 12, the second weld 125 has a weld width (denoted by e in fig. 12) ranging from 0.2 to 0.3 mm.

It should be noted that, in this embodiment, the second welding seam 125 is arranged along the circumferential direction of the edge of the casing cover 120, which means that the track of the second welding seam 125 is a continuous track, and the track is a circular track formed by surrounding the edge of the casing cover 120. This is provided for the purpose of enabling the cover 120 to reliably seal the opening 111 in the housing 110.

It should be further noted that, in this embodiment, a value range of the weld width of the second weld 125 is 0.2-0.3mm, and exemplarily, the weld width of the second weld 125 may be 0.2mm, 0.25mm, or 0.3mm, or may be any value between 0.2-0.3mm, which is not limited in this embodiment, and specifically, the welding strength between the case cover 120 and the case body 110 can be ensured. Due to the arrangement, on one hand, excessive heat generated during welding due to excessive widening of the second welding seam 125 can be avoided, and further, the damage degree to the shell 110, the shell cover 120 and the winding core 200 can be reduced; on the other hand, it can be avoided that the gap between the case cover 120 and the case body 110 cannot be filled due to the excessively small fusion width of the second welding seam 125, that is, the requirement for sealing the battery cannot be met, and insufficient cold welding and welding strength are caused.

As a possible implementation, referring to fig. 12, the penetration (denoted by f in fig. 12) of the second weld 125 ranges from 0.05mm to 0.15 mm.

It should be noted that, in this embodiment, the penetration of the second welding seam 125 is in a range of 0.05-0.15mm, and exemplarily, the penetration of the second welding seam 125 may be 0.05mm, 0.1mm, or 0.15mm, or may be any value between 0.05-0.15mm, which is not limited in this embodiment, and specifically, the welding strength between the case cover 120 and the case body 110 can be ensured.

As one possible implementation manner, referring to fig. 14, the winding core 200 is further connected with a second tab 230, the second tab 230 is welded to the second conductive member 123, and a gap (denoted by g in fig. 14) exists between the welding position of the second tab 230 and the second conductive member 123 and the liquid pouring hole 121; referring to fig. 1, the first tab 220 and the second tab 230 have opposite polarities.

It should be noted that, in the present embodiment, the first tab 220 and the second tab 230 are set to have opposite polarities, and the main purpose of the present embodiment is to enable the first tab 220 and the second tab 230 to be respectively connected to two electrodes with opposite polarities in the battery, so as to ensure that the battery can be normally used. The distance exists between the welding position of the second tab 230 and the second conductive member 123 and the injection hole 121, and is mainly used for preventing the injection hole 121 from being blocked due to the welding of the second tab 230 and the second conductive member 123, so that subsequent electrolyte cannot be smoothly injected through the injection hole 121.

As one possible implementation manner, referring to fig. 11 and 12, the thickness of the first tab 220 (denoted by h1 in fig. 11) and the thickness of the second tab 230 (denoted by h2 in fig. 12) both have a value ranging from 0.03mm to 0.15 mm.

In this embodiment, the first tab 220 may be a negative tab, the second tab 230 may be a positive tab, or the first tab 220 may be a positive tab, and the second tab 230 may be a negative tab, which is not limited in this embodiment. The negative electrode tab is made of nickel or stainless steel nickel-plated material, and the positive electrode tab is made of aluminum or aluminum alloy material. Here, the thickness of the first tab 220 and the thickness of the second tab 230 both range from 0.03 to 0.15mm, and for example, the thickness of the first tab 220 and the thickness of the second tab 230 may both range from 0.03mm, 0.06mm, 0.1mm or 0.15mm, and may also range from any value between 0.03 and 0.15mm, which is not limited in this embodiment.

In addition, the thickness of the first tab 220 and the thickness of the second tab 230 are limited, so that on one hand, the problem that the tab is easy to break due to insufficient strength caused by too thin thickness of the first tab 220 and the second tab 230 can be avoided; on the other hand, the problem that the tab occupies a large space inside the battery due to the fact that the thickness of the first tab 220 and the thickness of the second tab 230 are too thick can be avoided.

As one possible implementation manner, referring to fig. 1 and 14, the width of the first tab 220 (denoted by i1 in fig. 1) and the width of the second tab 230 (denoted by i2 in fig. 14) both have a value in a range of 2-4 mm.

It should be noted that, in this embodiment, the value ranges of the width of the first tab 220 and the width of the second tab 230 are both 2-4mm, and for example, the width of the first tab 220 and the width of the second tab 230 may both be 2mm, 3mm or 4mm, or may be any value between 2-4mm, which is not limited in this embodiment. The value range of the width of the first tab 220 is limited mainly considering that the width of the first tab 220 is based on the diameter of the winding core cavity 210 in the winding core 200, and the width of the second tab 230 is required to be the same as the width of the first tab 220.

As one possible implementation, referring to FIG. 9, the diameter of the pour hole 121 (indicated by D2 in FIG. 9) is in the range of 1-2 mm.

In the present embodiment, the diameter of the liquid inlet 121 is in the range of 1-2mm, and the diameter of the liquid inlet 121 may be 1mm, 1.5mm or 2mm, or may be any value between 1-2mm, which is not limited in the present embodiment. Here, the diameter range of the liquid injection hole 121 is limited, so that on one hand, the structural strength of the case cover 120 is prevented from being insufficient due to the overlarge size of the liquid injection hole 121; on the other hand, the difficulty increase of electrolyte filling caused by the undersize of the liquid injection hole 121 can be avoided.

Example two

Fig. 16 is a flowchart of a method for manufacturing a battery according to an embodiment of the present disclosure. Fig. 17 is a flowchart showing a specific operation step of step S100 in fig. 16.

In a second aspect, the present application also provides a method for preparing a battery, which can be used for preparing the above battery. Referring to fig. 16, the method of manufacturing the battery includes:

s100: a can and a roll core are provided.

The casing 100 includes a casing body 110 and a casing cover 120, the casing body 110 has an opening 111, the casing cover 120 covers the opening 111, the casing cover 120 and the casing body 110 together form a receiving cavity 130, and the winding core 200 is located in the receiving cavity 130.

Specifically, referring to fig. 17, step S100 includes:

s110: respectively connecting the first end of the first tab and the first end of the second tab to the side wall of the winding core; wherein, the second of first utmost point ear is held and the second of second utmost point ear is held and all is extended towards the outside of rolling up the core, has the interval between second utmost point ear and the first utmost point ear.

The reason for providing the space between the second tab 230 and the first tab 220 is to prevent the first tab 220 and the second tab 230 from being short-circuited, which may adversely affect the performance of the battery. In addition, the purpose of extending the opposite ends of the first tab 220 and the second tab 230 to the outside of the winding core 200 is mainly to prepare for the subsequent processes, so that the first tab 220 can be welded to the inner bottom wall of the case body 110, and the second tab 230 can be welded to the case cover 120.

S120: and bending the first tab to enable the first end of the first tab to be attached to the first end face of the winding core.

Note that, one end of the first tab 220 is attached to the first end surface of the winding core 200, so that the winding core 200 connected with the first tab 220 is conveniently placed in the accommodating cavity 130 through the opening 111, and the first tab 220 can contact with the inner bottom wall of the casing 110, so that the first tab 220 is conveniently welded to the inner bottom wall of the casing 110 in the subsequent process.

S130: and placing the winding core in the accommodating cavity through the opening on the shell to enable the first tab to be in contact with the inner bottom wall of the shell.

S140: and bending the second tab to enable the first end of the second tab to be respectively attached to the second end face of the winding core and the bottom face of the shell cover.

It should be noted that the second tab 230 is bent to make the first end of the second tab respectively fit with the second end face of the winding core 200 and the bottom surface of the case cover 120, so as to facilitate the case cover 120 to cover the case 110 in the subsequent process.

The first end face and the second end face of the winding core 200 are two opposite end faces in the thickness direction of the winding core 200.

S150: and the shell cover covers the shell, and the shell cover is welded on the shell in a welding mode.

It should be noted that, here, after the housing cover 120 and the housing 110 are welded, the welding track needs to be continuous, that is, the weld seam between the housing cover 120 and the housing 110 is complete and has no gap, so as to prepare for the air tightness test in the subsequent process. In addition, step S150 is disposed before step S200, that is, the housing cover 120 is covered on the housing 110 and welded, and then the housing 110 and the first tab 220 are welded from the outer bottom wall side of the housing 110, so that the sub-arrangement is convenient for welding between the housing 110 and the first tab 220 in the subsequent steps.

S200: the shell and the first tab are welded from the outer bottom wall side of the shell, and a first weld is formed on the outer bottom wall of the shell.

Wherein the cover 120 is welded to the end of the housing 110 on the side remote from the bottom wall before the first weld 112 is formed, and a second weld 125 is formed.

It should be noted that, the shell 110 and the first tab 220 are welded on one side of the outer bottom wall of the shell 110, on one hand, the influence of spattering of welding slag and heat on the inner wall of the core cavity 210 when the first tab 220 is welded on the shell 110 through the core cavity 210 of the core 200 in the related art can be effectively prevented; on the other hand, such a welding manner can also avoid that welding slag remains in the winding core cavity 210 after welding when the first tab 220 is welded to the housing 110 through the winding core cavity 210 of the winding core 200 in the related art, which may cause adverse effects on the safety performance of the battery.

After step S200, the method further includes:

s300: and injecting electrolyte into the core rolling cavity through the liquid injection hole.

S400: the liquid injection hole is blocked by a blocking cover.

S500: and (5) carrying out air tightness detection on the assembled battery.

In addition, it should be noted that, except that the battery adopts the structure described in the foregoing first embodiment, other steps that are not described in detail all adopt the prior art, and this embodiment is not described herein again.

In the description of the present application, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. 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 in describing and simplifying the present application, and do not indicate or imply that the referenced model or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. In the description of the present application, "a plurality" means two or more unless specifically stated otherwise.

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 for illustrating the technical solutions 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 solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The battery is characterized by comprising a shell and a winding core, wherein the shell comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover covers the opening, the shell cover and the shell body jointly form an accommodating cavity, and the winding core is positioned in the accommodating cavity;

the shell cover is provided with a liquid injection hole, a core winding cavity is arranged in the core winding, at least one first lug is connected to the core winding and is positioned between the core winding and the inner bottom wall of the shell, and the projection of the liquid injection hole on the inner bottom wall of the shell, the projection of the core winding cavity on the inner bottom wall of the shell and the projection of the first lug on the inner bottom wall of the shell are at least partially overlapped;

2. The battery of claim 1, wherein the first weld is in the shape of a dot, a circle, a spiral dot, a spiral, an arc, a cross, or a m-shape.

3. The battery of claim 1 wherein a weld area is formed on the outer bottom wall of the case in projection of the first tab on the bottom wall of the case, the first weld being located within the weld area.

4. The battery of claim 3, wherein the welding region is circular and the diameter of the circular welding region is in the range of 1-3 mm;

and/or the distance between the welding area and the edge of the shell is 3.5-6 mm.

5. The battery of claim 1, wherein the bottom wall of the housing has a thickness in the range of 0.05-0.3 mm;

and/or the value range of the penetration of the first welding line is 0.06-0.4 mm;

and/or the value range of the welding seam surplus height of the first welding seam is 0.02-0.1 mm.

6. The battery according to any one of claims 1 to 5, wherein the case cover comprises a first conductive member, a second conductive member, and an insulating member between the first conductive member and the second conductive member, wherein the first conductive member is welded to an end portion of the case on a side away from the bottom wall and forms a second weld; the first conductive piece is provided with a first through hole, and the second conductive piece is connected with the second pole lug.

7. The battery of claim 6, wherein a metal boss is disposed on a surface of the second conductive member adjacent to the first conductive member, at least a portion of the metal boss extends into the first through hole and is connected to the second tab, and a liquid injection hole is disposed on the second conductive member, the liquid injection hole extending through the metal boss and communicating with the winding core cavity.

8. The cell defined in claim 6, wherein the second weld is arranged in a circumferential direction of an edge of the can cover;

the melting width of the second welding line ranges from 0.2mm to 0.3 mm;

and/or the value range of the penetration of the second welding line is 0.05-0.15 mm.

9. The battery of claim 6, wherein the winding core is further connected with the second tab, the second tab is welded with the second conductive member, and a distance exists between the welding position of the second tab and the second conductive member and the liquid injection hole;

wherein the first tab and the second tab have opposite polarities.

10. The battery of claim 6, wherein the thickness of the first tab and the thickness of the second tab both range from 0.03mm to 0.15 mm;

and/or the width of the first tab and the width of the second tab both range from 2mm to 4 mm;

and/or the diameter range of the liquid injection hole is 1-2 mm.

11. A method of making a battery, comprising:

providing a shell and a winding core;

the shell comprises a shell body and a shell cover, wherein the shell body is provided with an opening, the shell cover covers the opening, the shell cover and the shell body jointly form an accommodating cavity, and the winding core is positioned in the accommodating cavity;

welding the shell and the first tab from the side of the outer bottom wall of the shell, and forming a first welding seam on the outer bottom wall of the shell;

wherein, before the first welding seam is formed, the shell cover is welded with the end part of the side of the shell body far away from the bottom wall, and a second welding seam is formed.