CN216958436U - Battery with improved battery capacity - Google Patents

Abstract

The utility model provides a battery, which comprises a shell, a battery cell and a pole lug, wherein the battery cell and the pole lug are arranged in the shell, the pole lug comprises a first end part and a second end part, the first end part is electrically connected with the battery cell, and the second end part is electrically connected with the shell. Utmost point ear is still including the portion of bending that sets up between first end and second end, so that utmost point ear has flexible surplus, just also make utmost point ear have scalability, when utmost point ear received external pulling force, the portion of bending can take place flexible deformation, with eliminate partial pulling force, thereby reduce or eliminate the tension of utmost point ear and concentrate, can not drag utmost point ear and shell electric connection's welding position, effectively reduce or avoid utmost point ear fracture, improve utmost point ear and electric core, the reliability and the stability of electricity connection between the shell, improve the security and the performance of battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

The battery is a component for converting chemical energy into electric energy, and has very wide application in daily life and work. For example, the bluetooth headset is often used in various electronic devices such as mobile phones, cameras, notebooks, bluetooth headsets, and tablets to provide power for the electronic devices. The device occupies a very important position in the life and work of people.

The battery comprises a shell and a battery cell positioned in the shell, wherein the battery cell is provided with tabs (such as a positive tab and a negative tab) which are used for being connected with the shell so as to realize the conduction of current. At present, a tab on a battery cell is generally of a straight structure, one end of the tab is connected with a current collector of the battery cell, and the other end of the tab is connected with a casing, for example, the tab is generally connected with the casing and the current collector in a welding manner.

However, the tension in the tab is concentrated, and the tab is easily broken under external tension when the battery collides or expands during charging and discharging, thereby reducing the safety and usability of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery, which aims to solve the problems that the tension of a lug is concentrated, the lug is easy to break and the safety and the use performance of the battery are reduced in the conventional battery.

The application provides a battery, which comprises a shell, a battery cell and a lug, wherein the battery cell and the lug are arranged in the shell;

the tab comprises a first end and a second end, the first end is electrically connected with the battery cell, and the second end is electrically connected with the shell;

the tab further comprises a bent portion arranged between the first end portion and the second end portion.

Therefore, the bending part has certain flexibility, so that the tab has certain flexible allowance, and the tab has scalability. When the tab is subjected to external tension, for example, expansion deformation occurs in the battery charging and discharging process, or falling, collision and shaking occur in the transportation or use process, the bending structure can be subjected to telescopic deformation to eliminate partial tension, so that the tension concentration of the tab is reduced or eliminated, the welding position of the electrical connection between the tab and the shell is not dragged, the tab is effectively reduced or avoided from being broken, the reliability and stability of the electrical connection between the tab and the battery core and between the tab and the shell are improved, and the safety and the use performance of the battery are improved.

In one possible implementation manner, the cross-sectional shape of the bending portion includes a W shape, a V shape, a Z shape, and a circular arc shape.

In a possible implementation manner, the tab protrudes toward one side of the battery cell and is bent to form the bent portion.

In a possible implementation manner, the vertex of the bent portion does not exceed the surface of the second end portion, which faces away from the battery cell.

In a possible realization mode, the length of the bending part is 0.4mm-2 mm.

In a possible implementation manner, the bent portion is disposed near the second end portion.

In one possible implementation manner, the tabs include a first tab and a second tab, the casing includes a conductive shell and a conductive piece, and the conductive piece is arranged on the conductive shell in an insulated manner;

the first electrode lug is electrically connected with the conductive piece, and the second electrode lug is electrically connected with the conductive shell;

the first tab comprises a third end part electrically connected with the conductive piece, a fourth end part electrically connected with the battery cell and a first bending part positioned between the third end part and the fourth end part;

and/or the second pole lug comprises a fifth end part electrically connected with the conductive shell, a sixth end part electrically connected with the battery cell and a second bending part positioned between the fifth end part and the sixth end part.

In a possible implementation manner, the conductive shell further comprises a cover plate, the cover plate is covered on the conductive shell, and the conductive piece is arranged on the cover plate in an insulating manner.

In a possible implementation manner, an insulating piece is further included, and the insulating piece is located between the first tab and the cover plate;

alternatively, the insulator is located between the first tab and the conductive housing.

In one possible implementation, the insulator is disposed around the first tab such that the insulator is disposed on opposite sides of the first tab.

In one possible implementation, the width of the insulator is 0.2mm to 1mm greater than the width of the first tab in the width direction of the tab.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the drawings without inventive labor.

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

fig. 2 is an exploded view of a battery according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of a bending portion with a W-shaped cross section according to an embodiment of the present application;

fig. 4 is a schematic structural view of a bending portion having a V-shaped cross section according to an embodiment of the present application;

fig. 5 is a schematic structural view of a bending portion having a zigzag cross-sectional shape according to an embodiment of the present application;

fig. 6 is a schematic structural view of a bending portion having a circular arc-shaped cross section according to an embodiment of the present application;

fig. 7 is a schematic structural diagram illustrating a connection between a tab and a conductive member according to an embodiment of the present disclosure;

fig. 8 is a schematic structural view illustrating an insulator disposed on a tab according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a connection between a tab and a soft tab according to an embodiment of the present application;

fig. 10 is a side view illustrating connection of a tab and a soft tab provided in an embodiment of the application.

Description of reference numerals:

100-a battery;

10-a housing;

11-a conductive housing;

12-a conductive member;

13-a cover plate;

14-liquid injection hole;

20-electric core;

21-soft tab;

30-pole ear;

31-a first end portion;

32-a second end;

33-bending part;

40-an insulator;

50-an insulating layer;

60-welding seams.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.

For example, electronic devices such as mobile phones, cameras, and notebooks, which are commonly used in life, need to be powered by batteries, so as to ensure normal operation of the electronic devices.

Just as the content in the background art, be provided with electric core and utmost point ear in the casing of battery, the one end and the electric core of utmost point ear are connected, the other end is connected with the casing, generally, the structure of utmost point ear is straight column structure, that is to say, utmost point ear is in a state of stretching tightly and straightening, just so make the inside tension of utmost point ear comparatively concentrate, in the battery transportation or the in-process of using, meet and collide with, rock or when charging and discharging inflation, will make utmost point ear take place to split under the effect of external pulling force, especially the position that extremely ear and casing and electric core welded easily breaks, thereby influence the connection between utmost point ear and electric core, the casing, the security and the performance of battery have been reduced.

Based on the above problems, the battery provided by the embodiment of the application can reduce or eliminate the tension concentration of the tab, thereby reducing or avoiding the probability that the tab is broken in the battery charging and discharging or collision process, improving the reliability and stability of connection between the tab and the battery core and the shell, and improving the safety and the use performance of the battery.

Fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application, and fig. 2 is an exploded view of the battery provided in the embodiment of the present application.

The battery provided by the embodiment of the application can be a lithium ion battery, such as a steel shell battery or a button battery. The battery can be applied to electronic equipment such as a mobile phone, a camera, a bluetooth headset and the like to provide power for the electronic equipment, and taking the battery as a button battery as an example, as shown in fig. 1 and fig. 2, the battery 100 includes a housing 10, a battery core 20 arranged in the housing 10, and a tab 30.

The tab 30 includes a first end 31 and a second end 32, where the first end 31 may be electrically connected to the battery cell 20, and the second end 32 may be electrically connected to the casing 10, so that electric energy on the battery cell 20 can be transmitted to the casing 10 through the tab 30.

The tab 30 may be connected to the housing 10 and the battery cell 20 by bonding, clamping, welding, or the like, and in the embodiment of the present application, the tab 30 is connected to the housing 10 and the battery cell 20 by welding as an example.

Specifically, the battery cell 20 may include a current collector and an active coating (not shown in the figure) disposed on the current collector, the current collector extends outward to form a soft tab 21 (shown in fig. 9), an electrolyte (not shown in the figure) may also be disposed in the cavity of the housing 10, the active coating may perform a chemical reaction in the electrolyte to generate electric energy, and the first end 31 of the tab 30 may be welded to the soft tab 21 of the battery cell 20, so as to achieve electrical connection between the tab 30 and the battery cell 20.

Can also set up on the shell 10 and annotate liquid hole 14, annotate the cavity intercommunication of liquid hole 14 and shell 10, electrolyte can be through annotating the cavity that liquid hole 14 pours into shell 10 into, wherein, annotate the diameter of liquid hole 14 and can be 1mm-3mm, can make things convenient for the pouring into of electrolyte like this, simultaneously, can also prevent to influence the structural strength of shell 10 because of annotating the too big structural strength who annotates liquid hole 14 diameter, help improving the structural stability and the reliability of shell 10.

With continued reference to fig. 2, the tab 30 further includes a bent portion 33 disposed between the first end portion 31 and the second end portion 32, for example, a portion of the tab 30 may be subjected to a bending operation to form the bent portion 33 on the tab 30. Thus, the bent portion 33 has a certain flexibility, so that the tab 30 has a certain flexibility margin, and the tab 30 has flexibility. When the tab 30 is subjected to external pulling force, for example, expansion deformation occurs during the charging and discharging process of the battery, or the tab falls, bumps, or shakes during the transportation or use process, the bending portion 33 can be deformed in a telescopic manner to eliminate partial pulling force, so that the tension concentration of the tab 30 is reduced or eliminated, the tab 30 is not dragged to the welding position where the tab 30 is electrically connected with the housing 10, the breakage of the tab 30 is effectively reduced or avoided, the reliability and stability of the electrical connection between the tab 30 and the battery cell 20, the housing 10 are improved, and the safety and the use performance of the battery 100 are improved.

For example, in the manufacturing process of the battery 100, the first end portion 31 of the tab 30 and the soft tab 21 on the battery cell 20 may be welded and connected first, then the tab 30 is bent by the bending apparatus to form the bent portion 33 on the tab 30, and finally the second end portion 32 of the tab 30 and the housing 10 are welded and connected.

The bending portion 33 may be disposed close to the second end portion 32 of the tab, that is, the bending portion 33 is relatively far from the first end portion 31, so that the influence on the connection between the first end portion 31 and the battery cell 20 when the bending portion 33 is formed by bending can be avoided, and the reliability and stability of the electrical connection between the first end portion 31 and the battery cell 20 can be effectively ensured.

With continued reference to fig. 1 and 2, in the embodiment of the present application, the outer case 10 of the battery 100 may include a conductive housing 11 and a conductive member 12, wherein the conductive member 12 is disposed on the conductive housing 11 in an insulated manner.

The tabs 30 may include a first tab (i.e., the tab 30 in fig. 2) and a second tab (not shown in the drawings), the first tab may be electrically connected to the conductive component 12 (see fig. 7), and the second tab may be electrically connected to the conductive housing 11, wherein the first tab may be a positive tab and the second tab may be a negative tab, so that the conductive component 12 is a positive terminal of the battery 100 and the conductive housing 11 is a negative terminal of the battery 100.

Alternatively, the first tab may be a negative tab and the second tab may be a positive tab, so that the conductive component 12 is a negative end of the battery 100 and the conductive shell 11 is a positive end of the battery 100, in this embodiment, the first tab is a positive tab, the second tab is a negative tab, that is, the conductive component 12 is a positive end of the battery 100, and the conductive shell 11 is a negative end of the battery 100.

The positive electrode tab and the positive electrode current collector may be made of the same material, such as aluminum, and the negative electrode tab and the negative electrode current collector may be made of the same material, such as copper.

The first tab may include a third end (i.e., the first end 31 in fig. 2) electrically connected to the conductive member 12, a fourth end (i.e., the second end 32 in fig. 2) electrically connected to the battery cell, and a first bent portion (i.e., the bent portion 33 in fig. 2) between the third end and the fourth end. Just so can make first utmost point ear have certain scalability through first portion of bending to effectively avoid first utmost point ear breaking of taking place when receiving external tension, effectively improve stability and the reliability of electricity connection between first utmost point ear and electrically conductive 12, electric core 20, also improved reliability and stability of electric conductivity ability on the battery 100 positive pole end.

The second tab may also include a fifth end (not shown) electrically connected to the conductive housing 11, a sixth end (not shown) electrically connected to the cell, and a second bend (not shown) between the fifth end and the sixth end. Therefore, the second bending part can enable the second pole lug to have a certain telescopic allowance, so that the stability and reliability of the electric connection between the second pole lug and the conductive shell 11 and between the second pole lug and the battery cell 20 are effectively improved, the stability and reliability of the conductivity at the negative pole end of the battery 100 are also improved, and the stability and safety of the battery 100 are further improved.

In a possible implementation manner, as shown in fig. 1 and fig. 2, a cover plate 13 is further included, the cover plate 13 may be disposed on the conductive housing 11 in a covering manner, the conductive element 12 may be disposed on the cover plate 13 in an insulating manner, and specifically, an insulating layer 50 may be disposed between the conductive element 12 and the cover plate 13, and the insulating layer 50 may isolate the conductive element 12 and the cover plate 13 from each other, so as to prevent the conductive element 12 and the cover plate 13 from contacting each other and causing a short circuit of the battery 100.

In another possible implementation manner, the conductive housing may include a bottom wall and a side wall, the side wall is enclosed on the bottom wall, the cover plate is covered on the side wall, and a cavity of the housing is enclosed among the cover plate, the side wall and the bottom wall. The conductive member may be insulated from the sidewall of the conductive case, for example, an insulating layer may be provided between the conductive member and the sidewall of the conductive case to isolate the conductive member from the sidewall and prevent the conductive member from contacting the sidewall of the conductive case to short-circuit the battery.

In another possible implementation manner, the conductive member may be further disposed on the bottom wall of the conductive shell in an insulating manner, for example, an insulating layer may be disposed between the conductive member and the bottom wall to isolate the conductive member from the bottom wall and prevent the conductive member from contacting the bottom wall of the conductive shell to cause a short circuit of the battery.

The first tab (i.e., the tab 30 for connecting the conductive device 12 and the battery cell 20) provided in the embodiment of the present application will be described below by taking the structure of the battery 100 in which the conductive device 12 is disposed on the cover plate 13 in an insulating manner as an example.

Fig. 3 is a schematic view of a bending portion structure with a W-shaped cross section provided in an embodiment of the present application, fig. 4 is a schematic view of a bending portion structure with a V-shaped cross section provided in an embodiment of the present application, fig. 5 is a schematic view of a bending portion structure with a Z-shaped cross section provided in an embodiment of the present application, fig. 6 is a schematic view of a bending portion structure with a circular arc cross section provided in an embodiment of the present application, and fig. 7 is a schematic view of a structure of a tab connected to a conductive member provided in an embodiment of the present application.

Referring to fig. 3, the cross-sectional shape of the bending portion 33 may be W-shaped, or, referring to fig. 4, the cross-sectional shape of the bending portion 33 may be V-shaped, or, referring to fig. 5, the cross-sectional shape of the bending portion 33 may be Z-shaped, or, referring to fig. 6, the cross-sectional shape of the bending portion 33 may be circular arc. The portion 33 of bending of above-mentioned shape can effectively improve utmost point ear 30's scalable surplus, improves utmost point ear 30's elasticity, when utmost point ear 30 receives external force, can effectively prevent utmost point ear 30 fracture, improves reliability and the stability of being connected between utmost point ear 30 and electric core 20, shell 10.

As shown in fig. 6, the tab 30 may protrude and bend toward one side of the battery cell 20 to form a bent portion 33, that is, the bent portion 33 protrudes and bends toward the battery cell 20, but not toward one side of the cover plate 13, so that the contact between the bent portion 33 and the cover plate 13 can be effectively reduced or avoided, and thus the contact between the bent portion 33 and the cover plate 13 to short-circuit the battery 100 is prevented, and the safety of the battery 100 can be effectively improved.

As shown in fig. 6, the vertex of the bent portion 33 does not exceed a surface of the second end portion 32 facing away from the battery cell, that is, the bent portion 33 may be located below a side of the second end portion 32 facing away from the battery cell 20, where below refers to a direction in which the tab 30 faces one side of the battery cell 20, and above refers to a direction opposite to the below, that is, above refers to a direction in which the tab faces one side of the conductive component 12. That is, the bending portion 33 is entirely located below the side of the second end portion 32 facing the conductive member 12, and does not protrude above the side of the second end portion 32 facing the conductive member 12. This can further reduce or prevent the contact between the bent portion 33 and the cap plate 13, thereby effectively preventing the contact between the bent portion 33 and the cap plate 13 from causing a short circuit in the battery 100, and further improving the safety of the battery 100.

Referring to fig. 7, in the length direction of the tab 30 (i.e., the y direction in the figure), the length L1 of the bending portion 33 may range from 0.4mm to 2mm, and the bending portion 33 located in the length range may effectively improve the expansion margin of the tab 30, thereby further improving the elasticity of the tab 30. Meanwhile, the influence of overlong bending part 33 on the electric connection between the tab 30 and the battery cell 20 and the electric connection between the tab 30 and the battery cell 10 can be reduced or avoided, and the reliability of the connection between the tab 30 and the battery cell 20 and the electric connection between the tab 30 and the casing 10 can be improved.

As shown in fig. 7, the width W1 of the tab 30 may be 1.5mm-5mm, and the tab 30 located in the width range may effectively increase the welding area between the tab 30 and the battery cell 20 and between the tab 30 and the battery case 10, so as to effectively improve the firmness and reliability of the electrical connection between the tab 30 and the battery cell 10 and between the tab 30 and the battery cell 20, and meanwhile, the structural strength of the tab 30 may also be improved, and the fracture of the tab 30 may be effectively reduced or avoided.

The thickness of the tab 30 is 0.05mm-0.2mm, and the tab 30 within the thickness range can further improve the strength of the tab 30, prevent the tab 30 from breaking, and simultaneously can further improve the reliability and stability of connection between the tab 30 and the battery cell 20 and the housing 10.

Fig. 8 is a schematic structural diagram of an insulator disposed on a tab according to an embodiment of the present application.

In the embodiment of the present application, an insulating member 40 is further included in the battery 100, as shown in fig. 8, wherein when the conductive member 12 is insulatedly disposed on the cover plate 13, the insulating member 40 may be disposed on a side (shown in fig. 2) of the first tab (i.e., the tab 30 in the figure) facing the cover plate 13, that is, the insulating member 40 is disposed between the tab 30 and the cover plate 13 to isolate the tab 30 from the cover plate 13, so as to prevent the tab 30 from contacting the cover plate 13 to short-circuit the battery 100, and effectively improve the safety of the battery 100.

Or, the insulating member may be further disposed between the first tab and the conductive casing, for example, when the conductive member is disposed on the sidewall of the conductive casing in an insulating manner, the insulating member may be disposed at a position where the first tab corresponds to the sidewall to isolate the first tab from the sidewall, so as to prevent the first tab from contacting the sidewall to short-circuit the battery. Or, when the conductive piece is arranged on the bottom wall of the conductive shell in an insulating way, the insulating piece can be arranged at the position corresponding to the first tab and the bottom wall so as to isolate the first tab from the bottom wall, and therefore, the first tab is prevented from being in contact with the bottom wall to cause the short circuit of the battery.

Take first utmost point ear and apron to be separated by the insulating part as an example, wherein, insulating part 40 can encircle first utmost point ear setting to all be provided with insulating part 40 on making the relative two sides of first utmost point ear, also be provided with this insulating part 40 on the one side of first utmost point ear towards apron 13 and the one side of apron 13 dorsad, can make insulating part 40 also play certain insulating effect between the terminal surface of first utmost point ear and electric core 20 (the terminal surface of electric core 20 towards electrically conductive 12 one end promptly), can prevent effectively that first utmost point ear and electric core 20 from taking place the contact, prevent that first utmost point ear and electric core 20 contact and make battery 100 take place the short circuit. Simultaneously, insulator 40 encircles first utmost point ear setting, can also further improve the fastness and the reliability that insulator 40 set up on first utmost point ear, promotes the insulating effect of insulator 40 between to first utmost point ear and apron 13, electric core 20.

A second insulating member (not shown in the figure) may also be disposed on the end surface of the end of the battery cell 20 facing the conductive member 12, so that the end surface of the battery cell 20 can be effectively prevented from contacting the first tab, the cover plate 13 and the conductive member 12, thereby effectively preventing the battery cell 20 from contacting the above structural members to cause a short circuit of the battery 100, and further improving the safety of the battery 100.

With continued reference to fig. 8, in the width direction (i.e., x direction in the figure) of the first tab (i.e., the tab 30 in the figure), the width W2 of the insulating member 40 is 0.2mm-1mm greater than the width W1 of the first tab, so that the insulating effect of the insulating member 40 on the first tab can be further improved, and the influence on the insulation between the first tab and the cover plate 13 due to the too small width of the insulating member 40 can be reduced or avoided. Meanwhile, the width of the insulating piece 40 can be prevented from being too large to clamp the insulating piece between the connecting parts of the cover plate 13 and the conductive shell 11, and the phenomenon that the normal connection between the cover plate 13 and the conductive shell 11 is affected due to the too wide insulating piece 40 can be avoided.

In the embodiment of the present invention, the tab 30 and the outer shell 10 may be electrically connected by welding, and in particular, when the tab 30 and the outer shell 10 are electrically connected by welding, a weld 60 (see fig. 7) may be formed on the tab 30, and in particular, the weld 60 may be formed on the second end portion 32 of the tab 30, so that the tab 30 and the outer shell 10 may be connected by the weld 60. The tab 30 and the housing 10 may be welded together by ultrasonic welding or laser welding.

The weld penetration of the weld 60 may be greater than the thickness of the tab 30 and less than the sum of the thicknesses of the tab 30 and the housing 10, i.e., the weld penetration of the weld 60 on the first tab may be greater than the thickness of the first tab and less than the sum of the thicknesses of the first tab and the conductive member 12. And the weld penetration of the weld 60 on the second tab may be greater than the thickness of the second tab and less than the sum of the thickness of the second tab and the conductive shell 11.

Therefore, the problem that the firmness and the reliability of connection between the lug 30 and the shell 10 are reduced due to too small welding penetration can be effectively avoided, and the reliability and the stability of electric connection between the lug 30 and the shell 10 are effectively improved. Meanwhile, it is possible to prevent the weld 60 from extending to the other surface of the case due to excessive weld penetration, to prevent the weld 60 from extending to the other surface of the case 10 and affecting the connection between the case 10 and other structural members, and to improve the overall aesthetic appearance of the battery 100.

Specifically, for example, the weld penetration of the weld 60 may be 0.08mm to 0.2mm, and specifically, the weld penetration of the weld 60 may be selectively set according to the thicknesses of the tabs 30 (i.e., the first tab and the second tab), the thicknesses of the housing 10 (the conductive member 12 and the conductive housing 11), and specific scene requirements.

Wherein, the welding seam 60 is provided with a welding print bulge, and the height range of the welding print bulge can be 0.02mm-0.1 mm. The solder print protrusion in the height range can effectively reduce or avoid interference with the battery cell 20 due to too high solder print protrusion, and prevent the normal operation of the battery 100 from being influenced by the interference of the solder print protrusion and the battery cell 20.

The weld 60 on the tab 30 may be a spot weld or a continuous weld, for example, the shape of the weld 60 may include: circular, polygonal, arcuate, spiral point, and spiral. Specifically, the shape of the weld 60 can be selected and set according to specific scene requirements.

After the welding operation between the tab 30 and the housing 10 is completed, a tensile test may be performed on the tab 30, specifically, a tensile test of 180 ° may be performed on the tab 30 in an extension plane parallel to the tab 30, and a tensile value may be greater than or equal to 5N. According to the tensile test results, it can be determined that the connection strength between the tab 30 and the case 10 in the battery 100 provided in the embodiment of the present application satisfies the requirements.

Fig. 9 is a schematic structural diagram of connection of a tab and a soft tab provided in an embodiment of the present application, and fig. 10 is a side view of connection of a tab and a soft tab provided in an embodiment of the present application.

As shown in fig. 9 and 10, when the tab 30 is welded to the soft tab 21 of the battery cell 20, a weld 60 is also formed at the first end 31 of the tab 30, wherein the height of the weld projection between the tab 30 and the soft tab 21 may be 0.02mm to 0.1mm, and the weld projection within the height range may effectively avoid interference between the weld 60 and the battery cell 20, thereby effectively ensuring normal operation of the battery 100.

The welding between the tab 30 and the soft tab 21 can also be achieved by ultrasonic welding or laser welding. After the welding operation between the tab 30 and the soft tab 21 is completed, the tab 30 can be subjected to a tensile test, specifically, the tab 30 can be subjected to a tensile test of 180 degrees in an extension plane parallel to the tab 30, and the tensile value can be greater than or equal to 5N. According to the tensile test result, it can be determined that the connection strength between the tab 30 and the soft tab 21 in the battery 100 provided in the embodiment of the present application meets the requirement.

After the assembly of the battery 100 is completed, the tightness test can be performed on the battery 100, specifically, the tightness test can be performed by a helium test method, and according to the tightness test result, the tested leak rate is less than 1.0E-6mbar.l/s, and it can be judged that the tightness meets the requirements in the battery 100 provided by the embodiment of the present application.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, merely 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 thus, are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, 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.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, may be used in either the internal or the external relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

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; while the utility model has been described in detail and with reference to the foregoing embodiments, it will 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; 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 invention.

Claims (11)

1. The battery is characterized by comprising a shell, a battery core and a lug, wherein the battery core and the lug are arranged in the shell;

the tab comprises a first end and a second end, the first end is electrically connected with the battery cell, and the second end is electrically connected with the shell;

the tab further comprises a bent portion arranged between the first end portion and the second end portion.

2. The battery according to claim 1, wherein the cross-sectional shape of the bent portion includes a W-shape, a V-shape, a Z-shape, and a circular arc shape.

3. The battery of claim 1 or 2, wherein the tab protrudes toward one side of the battery cell and is bent to form the bent portion.

4. The battery of claim 3, wherein the vertex of the bent portion does not exceed the surface of the second end portion facing away from the battery cell.

5. The battery according to claim 4, wherein the length of the bent portion is 0.4mm-2 mm.

6. The battery of claim 5, wherein the bend is disposed proximate the second end.

7. The battery of claim 1 or 2, wherein the tabs comprise a first tab and a second tab, the housing comprises a conductive shell and a conductive member, and the conductive member is insulatively disposed on the conductive shell;

the first electrode lug is electrically connected with the conductive piece, and the second electrode lug is electrically connected with the conductive shell;

the first tab comprises a third end part electrically connected with the conductive piece, a fourth end part electrically connected with the battery cell and a first bending part positioned between the third end part and the fourth end part;

and/or the second pole lug comprises a fifth end part electrically connected with the conductive shell, a sixth end part electrically connected with the battery cell and a second bending part positioned between the fifth end part and the sixth end part.

8. The battery of claim 7, further comprising a cover plate covering the conductive housing, wherein the conductive member is insulated from the cover plate.

9. The battery of claim 8, further comprising an insulator between the first tab and the cover plate;

alternatively, the insulator is located between the first tab and the conductive housing.

10. The battery of claim 9, wherein the insulator is disposed around the first tab.

11. The battery of claim 9, wherein the width of the insulator is 0.2mm-1mm greater than the width of the first tab.

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