CN210805912U

CN210805912U - Battery tab and battery containing same

Info

Publication number: CN210805912U
Application number: CN201922003663.XU
Authority: CN
Inventors: 覃关键; 许瑞; 王易玮
Original assignee: Dongguan Huiyang Power Technology Co ltd
Current assignee: Dongguan Huiyang Power Technology Co ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-06-19
Anticipated expiration: 2029-11-19

Abstract

The utility model belongs to the technical field of the battery, especially, relate to a battery tab, glue including utmost point ear body and utmost point ear, the utmost point ear body includes weld zone, transition district, encapsulated area and exposes the district, utmost point ear glue set up in the encapsulated area, utmost point ear body be provided with the cavity passageway and with the through-hole of cavity passageway intercommunication, the through-hole is located the transition district. In addition, the invention also provides a battery, which comprises a naked battery cell, and a positive pole lug and a negative pole lug welded on the naked battery cell, wherein the positive pole lug and/or the negative pole lug are/is the lug. Compared with the prior art, the utility model discloses this utmost point ear can effectively ensure the injection of electrolyte and become gaseous discharge, adopts the battery of this utmost point ear, can practice thrift manufacturing cost, can improve production efficiency again.

Description

Battery tab and battery containing same

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a battery tab and contain battery of this battery tab.

Background

The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.

The soft package lithium ion battery mainly comprises the following process flows: 1) sheet making and winding; 2) packaging by a roll core; 3) a top side sealing process; 4) liquid injection and pre-sealing; 5) a formation step; 6) vacuumizing and secondary sealing; 7) and (4) carrying out subsequent procedures such as capacity grading and the like. In the traditional preparation process, the liquid injection and vacuum pumping processes are mainly carried out in a mode of reserving an air bag, a part of unsealed aluminum-plastic film is reserved on the side edge to complete the liquid injection process, gas generated by formation is pumped out through the air bag, and redundant aluminum-plastic film is removed to complete the secondary sealing process. However, the traditional process has certain disadvantages: 1) the reserved aluminum-plastic film is removed in a secondary sealing process, so that a large amount of aluminum-plastic film is wasted; 2) the process flow is complicated, the consumed time is long, and the production efficiency is low.

In order to solve the above problems, in the prior art, a hollow channel is provided in a tab, an electrolyte is injected into a battery through the hollow channel by an electrolyte injection device, the battery is vacuumized through the hollow channel by a vacuum device, and simultaneously, generated gas is also exhausted from the battery through the hollow channel. Although the method reduces the waste of air bag materials and secondary sealing procedures, the end of the pole lug connected with the hollow channel and the pole piece is often sealed in the welding process, so that the electrolyte cannot be injected into the battery from the end, and the formed gas cannot be smoothly discharged out of the battery.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: the battery tab can effectively ensure the injection of electrolyte and the discharge of formed gas, save the production cost of the battery and improve the production efficiency of the battery.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a battery tab, includes utmost point ear body and utmost point ear glue, the utmost point ear body includes weld zone, transition district, encapsulated area and exposes the district, utmost point ear glue set up in the encapsulated area, the utmost point ear body be provided with the cavity passageway and with the through-hole of cavity passageway intercommunication, the through-hole is located the transition district.

On the one hand, the utility model discloses a battery tab converts traditional solid utmost point ear into the utmost point ear that has the cavity passageway in advance, with the notes liquid of battery and change into the product business turn over by this cavity passageway for the battery that adopts this utmost point ear need not to set up and leaves behind the encapsulation in advance of plastic-aluminum membrane and annotate liquid mouth and air pocket, also can reduce two processes, has both reduced the occupation space of equipment, and the cost is reduced again, has improved production efficiency. On the other hand, the utility model discloses still be provided with the through-hole with the cavity passageway intercommunication on the transition district of utmost point ear body to it is encapsulated in battery inside, when utmost point ear body welding on the utmost point piece, even if the cavity passageway of utmost point ear weld district has been sealed by the welding, electrolyte and change into the gas that produces and also can pass through this through-hole business turn over cavity passageway, thereby effectively ensure the pouring into of electrolyte and change into the discharge that produces the gas.

As an improvement of the battery tab, the width of the welding area is 5-10 mm. Generally, the tab welding area is 5 to 10 mm. Of course, the width of the welding area can be changed correspondingly according to the sizes of different battery cores.

As an improvement of the battery tab, the thickness of the hollow channel is 0.1-2 mm. The thickness of the hollow channel can be set according to the actual liquid injection requirement, but should be kept in the range as much as possible. If the thickness of the hollow channel is too large, since a part of the tab is connected inside the battery, when the thickness is too large, the battery thickness of the tab portion is too thick compared to the battery of the other portion, so that there is a risk of reducing the energy density; if the thickness of the hollow channel is too small, because the electrolyte liquid has surface tension, and the channel is too small, a lot of energy is consumed to drive the electrolyte to enter the battery shell, and in addition, the channel is too small, which is not beneficial to industrial practical production application and increases the difficulty of practical production. Therefore, it is preferable to maintain the thickness of the hollow passage within this range. Preferably, the thickness of the hollow channel is 0.5-1.5 mm.

As an improvement of the battery tab of the present invention, the hollow passage is a circular passage, an oval passage or a waist-shaped passage. Of course, the hollow passage is not limited to the illustrated shape, wherein the circular hole is convenient to process, and the elliptical hole and the kidney-shaped hole can increase the passage area and are more beneficial to the injection of the electrolyte.

As a battery tab's an improvement, the opening from interior to exterior of through-hole leans out gradually. The through hole opening is gradually inclined outwards, so that the electrolyte can be smoothly discharged from the hollow channel, and the generated gas can be quickly collected into the hollow channel through the through hole.

As a battery tab's an improvement, the width of utmost point ear body is 5 ~ 120mm, whole thickness after utmost point ear body pressfitting is sealed is 0.1 ~ 2 mm. The width of the tab body can be subjected to die cutting according to the sizes of different battery cores, the overall thickness of the tab body after press-fitting and sealing is approximately similar to the thickness of the tab body before the hollow channel is not arranged in the initial manufacturing process, and the thickness of the final tab is not changed due to the arrangement of the hollow channel.

Another object of the present invention is to: the utility model provides a battery, include naked electric core and weld in anodal utmost point ear and negative pole utmost point ear on the naked electric core, anodal utmost point ear and/or negative pole utmost point ear be the instruction book the aforesaid utmost point ear. At least one of the positive electrode lug and the negative electrode lug is provided with a hollow channel, and certainly, when the positive electrode lug and the negative electrode lug are both provided with the hollow channel, the injection efficiency of electrolyte can be higher, and the exhaust efficiency of gas generated by formation can also be higher.

As an improvement of the battery, the positive pole utmost point ear with the negative pole utmost point ear sets up naked electric core with one end. When the positive pole lug and the negative pole lug are arranged at the same end, the packaging process of the battery is simpler.

As an improvement of the battery, the positive pole utmost point ear with the negative pole utmost point ear set up in naked electric core both ends relative. The positive pole lug and the negative pole lug are arranged at two opposite ends of the bare cell, so that the area of the positive pole lug and/or the negative pole lug can be properly increased, the width of the hollow channel can also be properly increased, and the injection of electrolyte and the discharge of generated gas are more smooth.

The beneficial effects of the utility model reside in that: the utility model provides a battery tab, glue including utmost point ear body and utmost point ear, the utmost point ear body includes weld zone, transition district, encapsulated area and exposes the district, utmost point ear glue set up in the encapsulated area, utmost point ear body be provided with the cavity passageway and with the through-hole of cavity passageway intercommunication, the through-hole is located the transition district. In addition, the invention also provides a battery, which comprises a naked battery cell, and a positive pole lug and a negative pole lug welded on the naked battery cell, wherein the positive pole lug and/or the negative pole lug are/is the lug. Compared with the prior art, the utility model discloses this utmost point ear can effectively ensure the injection of electrolyte and become gaseous discharge, adopts the battery of this utmost point ear, can practice thrift manufacturing cost, can improve production efficiency again.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is one of the structural schematic diagrams of the middle tab body of the present invention.

Fig. 3 is a second schematic structural view of the middle tab body according to the present invention.

Wherein: 1-pole lug body, 2-pole lug glue, 11-hollow channel, 12-through hole, 101-welding area, 102-transition area, 103-packaging area and 104-exposed area.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

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

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.

Example 1

As shown in fig. 1 to 3, a battery tab comprises a tab body 1 and tab glue 2, wherein the tab body 1 comprises a welding region 101, a transition region 102, a packaging region 103 and an exposed region 104, the tab glue 2 is arranged in the packaging region 103, the tab body 1 is provided with a hollow channel 11 and a through hole 12 communicated with the hollow channel 11, and the through hole 12 is located in the transition region 102. On one hand, the liquid injection and the chemical formation gas production of the battery are both fed and discharged through the hollow channel 11, so that the battery adopting the tab does not need to be provided with a liquid injection port and an air bag after the pre-sealing of the aluminum plastic film, the secondary sealing process can be reduced, the occupied space of equipment is reduced, the cost is reduced, and the production efficiency is improved. On the other hand, the transition region of the tab body 1 is provided with a through hole 12 communicated with the hollow channel 11 and is packaged in the battery, when the tab body 1 is welded on the tab, even if the hollow channel 11 of the tab welding region 102 is welded and sealed, the electrolyte and the generated gas can enter and exit the hollow channel 11 through the through hole 12, thereby effectively ensuring the injection of the electrolyte and the discharge of the generated gas.

Further, the width of the welding area 102 is 5 to 10 mm. The width of the welding region 102 may also be changed according to the size of different battery cells.

Further, the thickness of the hollow channel 11 is 0.1-2 mm. Preferably, the thickness of the hollow channel 11 is 0.5-1.5 mm. The thickness of the hollow channel 11 can be set according to the actual filling requirements, but should be kept within this range as much as possible. If the thickness of the hollow channel 11 is too large, since a part of the tab is connected inside the battery, when the thickness is too large, the battery thickness of the tab portion is too thick relative to the battery of the other portion, and thus there is a risk of reducing the energy density; if the thickness of the hollow channel 11 is too small, because the electrolyte liquid has surface tension, the channel is too small, a lot of energy is consumed to drive the electrolyte to enter the battery shell, and in addition, the channel is too small, which is not beneficial to industrial practical production application and increases the difficulty of practical production.

Further, the hollow passage 11 is a circular hole, an oval hole or a kidney-shaped hole.

Further, the opening of the through-hole 12 is gradually inclined outward from the inside to the outside. The gradual outward inclination of the opening of the through hole 12 is more beneficial to the smooth discharge of the electrolyte from the hollow channel 11, and similarly, it is more beneficial to the rapid gas generation from the through hole 12 into the hollow channel 12.

Further, the width of the tab body 1 is 5-120 mm, and the overall thickness of the tab body 1 after press-fitting and sealing is 0.1-2 mm. The width of the tab body 1 can be die-cut according to the sizes of different battery cells, the overall thickness of the tab body 1 after press-fitting and sealing is approximately similar to the thickness of the tab body before the hollow channel 11 is not arranged in the initial manufacture, and the thickness of the final tab is not changed due to the arrangement of the hollow channel 11. The press-fit sealing means that after the electrode lug body 1 is subjected to formation to generate gas, the electrode lug body is pressed through external force, and then the hollow channel 11 is completely welded and sealed through a welding process.

Example 2

The utility model provides a battery, includes naked electric core and welds anodal utmost point ear and the negative pole utmost point ear on naked electric core, and anodal utmost point ear is the utmost point ear of embodiment 1, and negative pole utmost point ear is conventional utmost point ear. The positive pole utmost point ear and negative pole utmost point ear set up the same end at naked electric core.

Example 3

The utility model provides a battery, includes naked electric core and welds anodal utmost point ear and the negative pole utmost point ear on naked electric core, and anodal utmost point ear and negative pole utmost point ear are embodiment 1's utmost point ear. The positive pole utmost point ear and negative pole utmost point ear set up the same end at naked electric core.

Example 4

A battery comprises a naked battery cell, and a positive electrode lug and a negative electrode lug which are welded on the naked battery cell, wherein the positive electrode lug is a conventional lug, and the negative electrode lug is the lug of embodiment 1. The positive pole lug and the negative pole lug are arranged at two opposite ends of the naked electric core.

Example 5

The utility model provides a battery, includes naked electric core and welds anodal utmost point ear and the negative pole utmost point ear on naked electric core, and anodal utmost point ear and negative pole utmost point ear are embodiment 1's utmost point ear. The positive pole lug and the negative pole lug are arranged at two opposite ends of the naked electric core.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A battery tab, its characterized in that: including utmost point ear body and utmost point ear glue, the utmost point ear body includes weld zone, transition district, encapsulated area and exposes the district, utmost point ear glue set up in the encapsulated area, the utmost point ear body be provided with hollow channel and with the through-hole of hollow channel intercommunication, the through-hole is located the transition district.

2. The battery tab as claimed in claim 1, wherein: the width of the welding area is 5-10 mm.

3. The battery tab as claimed in claim 1, wherein: the thickness of the hollow channel is 0.1-2 mm.

4. The battery tab as claimed in claim 3, wherein: the thickness of the hollow channel is 0.5-1.5 mm.

5. The battery tab as claimed in claim 1, wherein: the hollow channel is a circular pore channel, an oval pore channel or a kidney-shaped pore channel.

6. The battery tab as claimed in claim 1, wherein: the opening of the through hole is gradually inclined outwards from inside to outside.

7. The battery tab as claimed in claim 1, wherein: the width of utmost point ear body is 5 ~ 120mm, the whole thickness of utmost point ear body pressfitting after sealed is 0.1 ~ 2 mm.

8. The utility model provides a battery, includes naked electric core and welds in anodal utmost point ear and negative pole utmost point ear on the naked electric core, its characterized in that: the positive electrode tab and/or the negative electrode tab is the tab as claimed in any one of claims 1 to 7.

9. The battery of claim 8, wherein: the positive pole lug and the negative pole lug are arranged at the same end of the naked electric core.

10. The battery of claim 8, wherein: the positive pole lug and the negative pole lug are arranged at two opposite ends of the bare cell.