CN111668439A - Electric connector, battery cell, soft package battery, module of soft package battery and battery cell lug machining method - Google Patents

Abstract

The invention discloses an electric connecting piece, an electric core, a soft package battery, a module thereof and a processing method of a lug of the electric core. According to the invention, the buffer area and the fusing area are arranged on the electric connecting piece, when an external circuit such as a battery cell is in short circuit, instantaneous large current is generated in the battery cell, the fusing area is fused, the short circuit process is terminated, and the buffer area plays a role in buffering pulling caused by vibration and impact.

Description

Electric connector, battery cell, soft package battery, module of soft package battery and battery cell lug machining method

Technical Field

The invention relates to the field of soft package batteries, in particular to an electric connector, a battery cell, a soft package battery, a module of the soft package battery and a battery cell lug processing method.

Background

The safety protection when the battery is short-circuited is a link which must be considered when a power battery package (Pack) is designed. In addition to package (Pack) level short circuit protection, the cell and module level also needs to consider short circuit protection design. For the hard-shell battery, a fusing area (Fuse) is designed inside each Cell (Cell). The current loop can be disconnected at the short-circuit moment, and the short-circuit protection function is achieved. For a soft package battery cell, a short circuit protection device is not arranged inside the battery cell at present, and when an external short circuit occurs, all the battery cells are in the middle of a short circuit loop. In a short time, a large amount of heat is generated. If the design is not protected, the battery core is easily damaged, and even safety risks such as fire are caused.

At present, the following technical schemes are mainly adopted at the level of a soft package battery core:

firstly, slotting on a tab to manufacture a fusing area;

secondly, a step shape is formed in the thickness direction of the electrode lug so as to form a fusing area;

thirdly, pre-bending the pole ear.

Fig. 7 shows a scheme of providing a fuse area on a tab, where when a short circuit occurs outside a battery cell, a large current is generated inside the battery cell in the instant, so that the fuse area fuses, and the short circuit process is terminated. The disadvantages of this solution are:

firstly, the tab is made of two materials: the aluminum strip 400 and the nickel strip 420 are connected by welding, so that the cost is increased;

secondly, the fusing area weakens the structural strength of the pole lug and cannot structurally reinforce the fusing area;

thirdly, electric sparks generated when the fusing area is fused can damage and even ignite the battery cell;

fourth, insulation after fusing cannot be guaranteed. After fusing, due to vibration, the two ends of the fusing area can contact and strike fire momentarily, so that the risk of fire is caused.

Fig. 8 shows a scheme of pre-bending the tab, which adopts an arc-shaped bend at the upper and lower sections of the tab 731, so as to avoid being pulled and broken during the battery cell vehicle-mounted vibration process. The disadvantages of this solution are:

firstly, when assembling, the tab is bent, so that the assembling efficiency is influenced;

secondly, the ideal design is difficult to realize in actual production;

and thirdly, the length types of the lugs are greatly increased when multiple electric cores are connected in parallel, and the production efficiency of a production line is reduced.

Fig. 9 shows a scheme of making a step shape in the tab thickness direction to form a fuse area, where a cell tab is composed of a tab 1 and a tab glue 2, where the tab is divided into a first tab portion 1a and a second tab portion 1b, and the thickness of the first tab portion 1a is greater than that of the second tab portion 1 b. When the short circuit takes place for electric core, can follow second pole ear department fusing, prevent the short circuit process and go on to avoid electric core explosion on fire, improved the security performance of electric core. The disadvantages of this solution are:

firstly, the thickness of the positive electrode lug of the current soft package battery cell is mostly 0.4mm, and the positive electrode lug is taken as a first electrode lug part, so that the thickness of a second electrode lug part is less than 0.4mm, the structural strength is weaker, and the positive electrode lug is easy to break from the connection part of the two electrode lug parts;

secondly, the stepped shape of the tab increases the cost.

Disclosure of Invention

The invention aims to provide an electric connector, an electric core, a soft package battery, a module thereof and a processing method of an electric core lug, so as to solve the problems in the prior art.

In order to solve the above problems, according to one aspect of the present invention, there is provided an electrical connector having opposite first and second ends, the electrical connector having a fuse region and a buffer region arranged in order along the first end toward the second end.

In one embodiment, the electrical connector is a cell tab, the cell tab includes a tab body having a first end and a second end opposite to each other, and the fuse area and the buffer area are sequentially disposed on the tab body along the first end toward the second end.

In one embodiment, the tab body has a uniform thickness.

In one embodiment, the tab body is made of a single material.

In one embodiment, the fuse region is further covered with a protective layer.

In one embodiment, the protective layer is tab glue, and the tab glue completely covers the fusing area.

In one embodiment, the buffer area is a pre-bending part formed on the tab body, and the pre-bending part extends along the width direction of the tab.

In one embodiment, the cross section of the pre-bending part is circular arc, semi-circular arc or wave.

In one embodiment, the fusing region is formed by slotting or punching a hole in the tab body.

In one embodiment, the fusing region includes a groove extending in a width direction of the tab body.

In one embodiment, the grooves are provided at both sides of the tab body in the width direction and extend toward the middle, or the grooves are provided at the middle of the tab body in the width direction.

In one embodiment, the fusing region includes a plurality of openings disposed in a width direction of the tab body and penetrating a thickness of the tab body.

According to another aspect of the invention, the battery cell is further provided, wherein the battery cell tabs are respectively arranged at two ends of the battery cell, and the battery cell tabs are electrically connected with the two ends of the battery cell and respectively used as a positive electrode and a negative electrode.

According to another aspect of the invention, the soft package battery comprises a battery cell, a packaging part wrapping the battery cell and the battery cell tabs, wherein the battery cell tabs are electrically connected with two ends of the battery cell and used as a positive electrode and a negative electrode of the soft package battery.

According to another aspect of the invention, there is also provided a soft-package battery module, which comprises a battery core assembly, a busbar assembly, an end plate assembly and a housing assembly, wherein the battery core assembly comprises a plurality of battery cell units, the battery cell units are arranged side by side in sequence and are provided with the battery cell tabs of any one of claims 1 to 11 at two ends, the battery core assembly is arranged in the housing assembly and is electrically connected with the busbar assembly, the busbar assembly is connected with the housing assembly, and the end plate assembly is connected with the busbar assembly and the housing assembly.

According to another aspect of the present invention, there is also provided a method for processing a cell tab, the method including the steps of:

firstly, cutting a coiled material into a sheet material with a required size;

secondly, punching a buffer area on the sheet by using a die;

thirdly, punching the fusing area on the sheet by using a die, or processing the fusing area on the sheet by using linear cutting and laser cutting;

step four, carrying out surface treatment on the sheet; and

step five: wrapping tab glue outside the fusing area;

or the method comprises the steps of:

firstly, cutting a coiled material into a sheet material with a required size;

secondly, punching a fusing area on the sheet by using a die, or processing the fusing area on the sheet by using linear cutting and laser cutting;

thirdly, punching a buffer area on the sheet by using a die;

step four, carrying out surface treatment on the sheet; and

step five: and a tab adhesive is wrapped outside the fusing area.

In conclusion, the tab is provided with the pre-bending area, so that the pulling caused by vibration and impact is buffered, the tab glue can be used for tightly wrapping the fusing area, the tab structure is reinforced, and the insulation of the fusing area after fusing can be ensured; in addition, the pole lug can be made of the same material, and the cost is low. And finally, the bending area and the slotting area can be formed at one time by conventional stamping and blanking processes, and the cost is low.

Drawings

Fig. 1 illustrates an exploded view of a battery module according to an embodiment of the present invention.

Figure 2 is a perspective view of one embodiment of a cell unit of the cell assembly of figure 1.

Fig. 3A-3B are front and left side views of a cell tab according to an embodiment of the present invention.

Fig. 4A-4B are front and left side views of a cell tab according to another embodiment of the present invention.

Fig. 5A-5B are front and left side views of a cell tab according to another embodiment of the present invention.

Fig. 6 is a flowchart of a method for processing a cell tab according to an embodiment of the present invention.

Fig. 7 shows a prior art solution for providing a fuse area on a tab.

Fig. 8 shows a prior art solution for pre-bending the pole ear.

Fig. 9 shows a prior art solution in which a step shape is formed in the thickness direction of a tab to form a fuse region.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

The application relates to an electric connector which is mainly used as a battery, in particular to a battery core tab of a soft package lithium ion battery. The battery generally includes a cell, a package member wrapping the cell, and a cell tab electrically connected to the cell. The cell tabs serve as the positive and negative electrodes of the battery. The cells and packages may employ any suitable structure and materials known or to be developed in the art and will not be described in detail herein. The battery of this application can be used to for equipment such as new energy automobile power supply.

Hereinafter, the electrical connector of the present application will be described in detail by taking a cell tab of a battery as an example. It will be appreciated that the electrical connector of the present application may also be used in other devices where disconnection may occur, such as circuit breakers. In the following embodiments, a cell tab of a battery is taken as an example for description.

Referring to fig. 1, there is shown an exploded view of a battery module 100 according to an embodiment of the present invention. One embodiment of the present invention provides a battery module 100, and the battery module 100 may be, for example, a pouch battery, which may be applied to the field of new energy vehicles, such as new energy electric vehicles or similar industrial fields.

Alternatively, as shown in fig. 1, the battery module 100 may include a battery cell assembly 100A, a busbar assembly 100B, an end plate assembly 100C, and a housing assembly 100D, where the battery cell assembly 100A includes a plurality of battery cell units, and the battery cell units are sequentially arranged side by side. The electric core assembly 100A is disposed within the housing assembly 100D and electrically connected to the busbar assembly 100B, the busbar assembly 100B is connected to the housing assembly 100D, and the end plate assembly 100C is connected to the busbar assembly 100B and the housing assembly 100D.

As shown in fig. 1, the bus bar assembly 100B and the end plate assembly 100C are two in number and are respectively located at both ends of the housing assembly 100D and the electric core assembly 100A. The two end plate assemblies 100C are used to encapsulate the two bus bar assemblies 100B, respectively, thereby achieving the encapsulation of the battery module 100.

Fig. 2 is a schematic perspective view of an embodiment of a cell unit of the cell assembly 100A. As shown in fig. 2, the cell unit 100E includes a cell 101E, a cell top seal 102E, and a cell tab 200, where the specific structure of the cell tab 200 refers to the following embodiments of the cell tab. Two ends of the battery core 101E are provided with a battery core top seal 101E, the battery core top seal 101E is connected with a battery core tab 200, a first end of the battery core tab 200 is electrically connected with the battery core through the battery core top seal 101E, and the other end of the battery core tab 200 is connected to the busbar assembly 100B, so that the battery core 101E is electrically connected with the busbar assembly 100B through the battery core tab 200.

It should be noted that, although the battery cell unit 100E is described by taking the battery cell tab 200 as an example, the battery cell unit 100E may be provided with a battery cell tab in each embodiment described below, for example, the battery cell tab 10A or the battery cell tab 300.

It should be further noted that the battery cell unit may also be a soft package battery, and the soft package battery may include, for example, a battery cell, a package member wrapping the battery cell, and a battery cell tab electrically connected to two ends of the battery cell. The cell tabs at the two ends of the cell are respectively used as the positive pole and the negative pole of the battery.

Embodiments of the cell tabs of the present invention are described below in conjunction with fig. 3-5. For convenience of description, an end of the cell tab connected to the cell is defined as a first end, and an end of the cell tab opposite to the first end is defined as a second end, and in the above-described embodiment of the battery module 100, that is, an end of the cell tab used for connection to the bus bar assembly is defined as a second end.

The battery cell tab is sequentially provided with the fusing area and the buffer area from the first end to the second end, and the fusing area is used for generating instant heavy current in the battery cell to fuse the fusing area when the external of the battery cell is short-circuited, so that the short-circuit process is terminated, the battery cell is prevented from being ignited and exploded, and the safety performance of the battery cell is improved; the buffer zone plays a role in buffering dragging caused by vibration and impact and protects the fusing zone, so that the service life of the battery module is prolonged and the safety performance of the battery module is improved, and the battery module has a wide application prospect.

Fig. 3A-3B are front and left side views of a cell tab 10A in accordance with an embodiment of the present invention. As shown in fig. 3A-3B, the cell tab 10A includes a tab body 10, and the tab body 10 may be made of, for example, a thin aluminum strip or other suitable material, and has a first end 11 and a second end 12 opposite to each other, where the first end 11 is used for connecting a cell (not shown), and the second end 12 is used for connecting a busbar assembly or a cell tab of another cell. The tab body 10 is provided with a fusing region 14 and a buffer region 13 in sequence from the first end 11 to the second end 12. The buffer zone 13 may be formed by pre-bending the tab body 10, for example, by one-time stamping. When electric core is applied to new forms of energy power automobile, electric core can vibrate along with going of vehicle, and at this moment the buffer zone can provide the buffering, avoids utmost point ear to receive to drag and the fracture, can also protect the fusing area simultaneously.

As is apparent from fig. 3A, the buffer zone 13 extends from the left end to the right end in the width direction of the tab body 10 (i.e., from left to right in fig. 3A). As shown in fig. 3B, the cross section of the buffer area in this embodiment is a semi-circular arc, however, it should be understood by those skilled in the art that the cross section of the buffer area may also be a circular arc or a wave.

The fusing region 14 is formed by forming a plurality of openings 141 in the tab body 10. As is apparent from fig. 3A, the plurality of holes 141 extend in the width direction of the tab body 10 (i.e., in the left-to-right direction in fig. 3A) and are parallel to the buffer zone 13. The shape of the aperture 141 may be circular, rectangular, diamond, etc. The number of the apertures 141 may be any number, such as five, ten, etc., depending on the width of the tab. The opening 141 can be formed by blanking, for example, which can reduce the local over-current area, increase the local resistance, form the fusing area, and when the external short circuit occurs to the battery cell, the current sharply increases, and the temperature in the fusing area rapidly rises and fuses, so as to protect the battery cell from further damage, and avoid the danger of fire, explosion, etc.

Further, as shown in fig. 3A, a protective layer 15 may be further disposed on the surface of the fusing region 14, and the protective layer 15 may be, for example, tab glue, which tightly wraps the fusing region 14, reinforces the tab structure, prevents the fusing region from being broken due to vibration, impact, etc. during normal operation, and simultaneously ensures insulation after fusing of the fusing region. The tab glue can be different high temperature resistant sealing materials such as fluorine rubber, silicon rubber, polypropylene rubber and the like. The protective layer 15 may cover only the fuse region 14, or may cover the fuse region 14 and a partial region other than the fuse region 14.

A cell tab 200 according to another embodiment of the invention is described below with reference to fig. 4A-4B. Fig. 4A-4B are front and left side views of a cell tab 200 according to another embodiment of the present invention. The cell tab 200 differs from the cell tab 10A in the structure of the fuse region 24, and the fuse region 24 of the cell tab 200 is formed by forming an elongated groove 241 extending in the width direction of the tab body 20 on the tab body 20.

Specifically, as shown in fig. 4A-4B, the cell tab 200 includes a tab body 20, where the tab body 20 has a first end 21 and a second end 22 opposite to each other, the first end 21 is used for connecting a cell (not shown), and the second end 22 is used for connecting a bus bar assembly or a cell tab of another cell. The tab body 20 is provided with a fusing region 24 and a buffer region 23 in sequence from the first end 21 to the second end 22. Buffer zone 23 is through forming at utmost point ear body 20 preflex, for example form through a punching press, and when new forms of energy power automobile was applied to electric core, electric core can vibrate along with going of vehicle, and at this moment the buffer zone can provide the buffering, avoids utmost point ear to receive to drag and the fracture, can also protect the fusing area simultaneously.

As is apparent from fig. 4A, the buffer zone 23 extends from the left end to the right end in the width direction of the tab body 20 (i.e., from left to right in fig. 4A). As shown in fig. 4B, the cross section of the buffer area in this embodiment is a semi-circular arc, however, it can be understood by those skilled in the art that the cross section of the buffer area can also be a circular arc or a wave.

The fusing region 24 is formed by forming an elongated groove 241 on the tab body 20. As is apparent from fig. 4A, the long groove 241 extends in the width direction of the tab body 20 (i.e., in the left-to-right direction in fig. 4A) and is parallel to the buffer zone 23. The shape of the elongated slot 241 may be circular, rectangular, diamond, etc. The length of the long groove 241 may be three tenths, one half, or the like of the width of the tab body 20. The long groove 241 can be formed by punching or processing on a sheet material by linear cutting or laser cutting, and the long groove 241 is formed on the tab body 20, so that the local flow area can be reduced, the local resistance can be increased, and a fusing area can be formed.

Further, as shown in fig. 4A, a protection layer 25 may be further disposed on the surface of the fusing area 24, the protection layer 25 may be, for example, tab glue, the fusing area 24 is tightly wrapped by the tab glue, the tab structure is reinforced, the fusing area is prevented from being broken due to vibration, impact, and the like during normal operation, and insulation after the fusing area is fused may also be ensured, and the tab glue may be, for example, different high temperature-resistant sealing materials, such as fluororubber, silicone rubber, polypropylene rubber, and the like. Similar to the protective layer 15 of the upper core tab 10A, the protective layer 25 may cover only the fuse region 24 of the tab body, or may cover the fuse region 24 of the tab body and a partial region other than the fuse region 24.

A cell tab according to another embodiment of the present invention will be described in detail with reference to fig. 5A to 5B. Fig. 5A-5B are front and left side views of a cell tab 300 according to another embodiment of the present invention. The difference between the battery cell tab 300 and the battery cell tabs 10A and 200 lies in the structure of the fusing area 34, and the fusing area 34 of the battery cell tab 300 is formed by respectively forming a groove 341 extending along the width direction of the tab body 20 at the left end portion and the right end portion of the tab body 20.

Specifically, as shown in fig. 5A-5B, the cell tab 300 includes a tab body 30, where the tab body 30 has a first end 31 and a second end 32 opposite to each other, the first end 31 is used for connecting a cell (not shown), and the second end 32 is used for connecting a bus bar assembly or a cell tab of another cell. The tab body 30 is provided with a fusing region 34 and a buffer region 33 in sequence from the first end 31 to the second end 32. The buffer zone 33 is formed by pre-bending the tab body 30, for example, by one-time punching. When electric core is applied to new forms of energy power automobile, electric core can vibrate along with going of vehicle, and at this moment the buffer zone can provide the buffering, avoids utmost point ear to receive to drag and the fracture, can also protect the fusing area simultaneously.

As is apparent from fig. 5A, the buffer zone 33 extends from the left end to the right end in the width direction of the tab body 30 (i.e., the direction from left to right in fig. 3A). As shown in fig. 3B, the cross section of the buffer area in this embodiment is a semi-circular arc, however, it should be understood by those skilled in the art that the cross section of the buffer area may also be a circular arc or a wave.

The fusing region 34 is formed by forming two grooves 341 on the tab body 30. As is apparent from fig. 3A, the two grooves 341 extend from the left and right ends of the tab body 10 to the middle portion, respectively, and form a connection portion in the middle portion, and the lengths of the grooves 341 at the left and right ends may be the same or different, for example, may be one fourth or one third of the width of the tab body 30. The shape of the groove 341 may also be circular, rectangular, diamond, etc. Similar to the elongated groove 241 of the cell tab 200, the groove 341 may also be formed by punching, or by machining a sheet material by wire cutting or laser cutting, for example. Through forming recess 341 on utmost point ear body 30, can play and reduce the local overcurrent area of electric core utmost point ear, increase local resistance, form the fusing region, when external short circuit takes place for electric core, the sharp increase of electric current, the regional temperature of fusing risees rapidly and fuses to protection electric core does not take place further damage, avoids taking place dangers such as fire, explosion.

Further, as shown in fig. 5A, a protection layer 35 is further disposed on the surface of the fusing area 34, the protection layer 35 may be, for example, tab glue, the fusing area 34 is tightly wrapped by the tab glue, the tab structure is reinforced, the fusing area is prevented from being broken due to vibration, impact, and the like during normal operation, and insulation after the fusing area is fused can be ensured, and the tab glue may be, for example, different high temperature-resistant sealing materials, such as fluororubber, silicone rubber, polypropylene rubber, and the like. As shown in fig. 5A, the protection layer 35 may cover only the fuse region 34, or may cover the fuse region 34 and a region other than a part of the fuse region 34.

A method of processing the cell tab in the above embodiment of the present invention is described below with reference to fig. 6, and it should be understood that the method described below can be applied to the processing of the cell tab in any of the above embodiments, for example, the processing of the cell tab 10A, the cell tab 200, or the cell tab 300. As shown in fig. 6, a method for processing a cell tab in the above embodiment of the present invention may include the following steps:

step S100: the web is cut into sheets of the desired size.

In step S100, the coiled material is cut into sheets with appropriate sizes according to the sizes of the battery cell tabs to be processed.

Step S200: the buffer zone is stamped out of the sheet material using a die.

Step S300: and punching the fusing area on the sheet by using a die, or processing the fusing area on the sheet by using linear cutting and laser cutting.

Step S400: performing surface treatment on the sheet;

step S500: and a tab adhesive is wrapped outside the fusing area.

It should be noted that the sequence of step S200 and step S300 can be changed, that is, after step S100, step S300 can be performed first, and then step S200 can be performed, that is, the fusing region is punched on the sheet by using a die, or after the fusing region is machined on the sheet by using wire cutting or laser cutting, the buffer region is punched on the sheet by using a die.

In conclusion, aiming at the problem that the structural strength of the fusing area to the electrode lug is weakened, the bending area is arranged on the electrode lug, so that the buffer effect on pulling caused by vibration and impact is achieved, the electrode lug glue can be used for tightly wrapping the fusing area to reinforce the electrode lug structure, and meanwhile, the insulation of the fusing area after fusing can be ensured; in addition, the pole lug can be made of the same material, and the cost is low. And finally, the bending area and the slotting area can be formed at one time by conventional stamping and blanking processes, and the cost is low.

While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (16)

1. An electrical connector characterized in that the electrical connector has opposite first and second ends, and a fuse region and a buffer region are arranged in the electrical connector in sequence from the first end to the second end.

2. The electrical connector of claim 1, wherein said electrical connector is a cell tab, said cell tab including a tab body having a first end for connecting to a cell and a second end opposite said first end, said tab body having said fuse region and said buffer region disposed thereon in sequence from said first end to said second end.

3. The electrical connector of claim 2, wherein said tab body has a uniform thickness.

4. The electrical connector of claim 2, wherein said tab body is made of a single material.

5. The electrical connector of claim 2, wherein said fuse region is further covered with a protective layer.

6. The electrical connector of claim 5, wherein said protective layer is tab glue, said tab glue completely covering said fuse region.

7. The electrical connector of claim 2, wherein said buffer is a pre-bend formed in said tab body, said pre-bend extending in a width direction of said tab.

8. The electrical connector of claim 7, wherein said pre-bend portion has a circular arc, semi-circular arc or wave shape in cross-section.

9. The electrical connector of claim 2, wherein said fuse region is formed by notching or punching a slot in said tab body.

10. The electrical connector of claim 2, wherein said fuse region includes a groove extending along a width of said tab body.

11. The electrical connector as claimed in claim 10, wherein the grooves are provided at both sides of the tab body in the width direction and extend toward the middle, or the grooves are provided at the middle of the tab body in the width direction.

12. The electrical connector of claim 2, wherein said fuse region includes a plurality of openings through the thickness of said tab body disposed along the width of said tab body.

13. A battery cell, characterized in that both ends of the battery cell are respectively provided with the battery cell tabs according to any one of claims 2 to 11, and the battery cell tabs are electrically connected with both ends of the battery cell and respectively serve as a positive electrode and a negative electrode.

14. A soft-package battery, characterized in that, soft-package battery includes electric core, parcel electric core's packaging part and the above-mentioned claim 2-12 the electric core utmost point ear, the electric core utmost point ear with the both ends electricity of electric core is connected and is used as soft-package battery's positive pole and negative pole.

15. The utility model provides a laminate polymer battery module, its characterized in that, laminate polymer battery module battery core subassembly, busbar subassembly, end plate subassembly and shell subassembly, battery core subassembly includes a plurality of electric core units, a plurality of electric core units set up side by side in proper order and be equipped with any one of claim 2-12 at both ends electric core utmost point ear, wherein battery core subassembly set up in the shell subassembly and with busbar subassembly electricity is connected, busbar subassembly with shell subassembly is connected, end plate subassembly with busbar subassembly and shell subassembly are connected.

16. A processing method of a battery core tab is characterized in that,

the method comprises the following steps:

firstly, cutting a coiled material into a sheet material with a required size;

secondly, punching a buffer area on the sheet by using a die;

thirdly, punching the fusing area on the sheet by using a die, or processing the fusing area on the sheet by using linear cutting and laser cutting;

step four, carrying out surface treatment on the sheet; and

step five: wrapping tab glue outside the fusing area;

or the method comprises the steps of:

firstly, cutting a coiled material into a sheet material with a required size;

secondly, punching a fusing area on the sheet by using a die, or processing the fusing area on the sheet by using linear cutting and laser cutting;

thirdly, punching a buffer area on the sheet by using a die;

step four, carrying out surface treatment on the sheet; and

step five: and a tab adhesive is wrapped outside the fusing area.

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