CN219123421U - Positive electrode tab, tab structure with positive electrode tab and battery - Google Patents

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly discloses a positive electrode tab, a tab structure with the positive electrode tab and a battery. In the tab structure, the second connecting section through setting up anodal tab is bent and is formed first kink, can make anodal tab wholly cushion like this when rocking or drunkenness under the influence of external world, reduced the unexpected cracked risk of anodal tab, set up first kink into the form of arranging the protection architecture inside again, can guarantee like this that the second connecting section can not appear the phenomenon of fracture when buckling, guarantee anodal tab and the circuit board of setting in the electric core body outside be in the intercommunication state, promoted the practicality of tab structure effectively.

Description

Positive electrode tab, tab structure with positive electrode tab and battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a positive electrode tab, a tab structure with the positive electrode tab and a battery.

Background

Lithium batteries can be divided into a hard shell battery and a soft package battery according to the shell property of an electric core, wherein the soft package battery has the advantages of high safety, light weight, large capacity, small internal resistance, flexible design and the like, so that the soft package battery is widely applied.

The existing soft-package battery mainly comprises a positive electrode material, a negative electrode material, a diaphragm, an aluminum plastic packaging film, a positive electrode tab and a negative electrode tab. The battery cell comprises a battery cell main body, a separator, a positive electrode material, a negative electrode material and a negative electrode material, wherein the positive electrode material and the negative electrode material are arranged on two sides of the separator and then wound to form the battery cell main body; placing the battery cell main body in an aluminum plastic packaging film for packaging; one end of the positive electrode lug is electrically connected with the positive electrode material, and the other end of the positive electrode lug is exposed outside the battery cell main body; one end of the negative electrode material is electrically connected with the negative electrode material, and the other end of the negative electrode material is exposed outside the battery cell main body.

After the soft package battery is assembled, the battery needs to be subjected to falling or vibration test, the winding core can be caused to move, so that the battery core tab is pulled under force, the risk of mechanical fatigue fracture exists, particularly, the bent positive electrode tab is made of aluminum materials, the bending resistance of the aluminum materials is poor, the tensile strength is weak, the positive electrode tab is easily broken at the bending position, and the practicability of the positive electrode tab cannot be guaranteed.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is that the aluminum material of the aluminum-nickel-converted tab in the prior art has higher hardness, so that the bending part of the aluminum material is easy to crack after bending.

To this end, the present utility model provides a positive electrode tab comprising:

the first connecting section is used for being electrically connected with an external battery cell body, the second connecting section is bent to form at least one first bending part, and the third connecting section is used for being electrically connected with an external circuit board;

the protection structure is sleeved on the outer side of the first bending part.

Optionally, the positive electrode tab described above,

the second connecting section is bent for three times to form three first bending parts, the first bending parts are all of U-shaped structures, and included angles are formed between the opening directions of the adjacent first bending parts.

Optionally, the positive electrode tab described above,

the protection structure is sleeved on the whole outer side of the second connecting section.

A tab structure comprising:

the positive electrode tab is the positive electrode tab;

and a negative electrode tab.

A battery, comprising:

a cell body;

the circuit board is arranged at the head part of the battery cell body;

the electrode lug structure is the electrode lug structure and is respectively connected with the battery cell body and the circuit board.

Alternatively, the battery described above,

the positive electrode tab in the tab structure is welded with the circuit board through the nickel sheet, and the nickel sheet is provided with a groove structure; and part of the structure of the third connecting section is inserted into the groove structure and welded with the inner side wall of the groove structure.

Optionally, the battery further includes:

the packaging piece is attached to the outer side wall surface of the battery cell body to form a top sealing part and a side sealing part, and the side sealing parts are arranged on two sides of the battery cell body along the width direction and two sides of the top sealing part;

the first connecting section penetrates through the top sealing part.

Optionally, the battery further includes:

the protection piece, the protection piece is including the fourth linkage segment, fifth linkage segment and the sixth linkage segment that connect gradually, the fourth linkage segment attached in top seal portion lateral wall face, the sixth linkage segment is in the opening part of first kink is bent and is formed the second kink, the sixth linkage segment is on a parallel with the fourth linkage segment sets up and attached in another lateral wall face of top seal portion, so that the protection piece encloses and closes and form the installation cavity.

Alternatively, the battery described above,

the fifth connecting section is provided with a first sub-connecting section, a second sub-connecting section and a third sub-connecting section which are sequentially connected, the first sub-connecting section and the third sub-connecting section are parallel to the plane where the head of the battery cell body is located, the second sub-connecting section is perpendicular to the plane where the head of the battery cell body is located, and the circuit board is arranged in the mounting cavity.

Alternatively, the battery described above,

the sealing element is arranged at the connecting part of the first connecting section and the second connecting section.

The technical scheme provided by the utility model has the following advantages:

the utility model provides a positive electrode tab, which comprises a first connecting section, a second connecting section and a third connecting section which are sequentially connected, wherein the first connecting section is used for being electrically connected with an external battery cell body, the second connecting section is bent to form at least one first bending part, and the third connecting section is used for being electrically connected with an external circuit board; the protection structure is sleeved on the outer side of the first bending part.

The positive pole tab of this structure is bent through setting up the second linkage segment and is formed first kink, can make the whole buffering of positive pole tab like this when rocking or drunkenness under the influence of external world, reduced the unexpected cracked risk of positive pole tab, set up first kink into the form of arranging the protection architecture inside again, can guarantee like this that the second linkage segment can not appear the phenomenon of fracture when buckling, guarantee that positive pole tab is in the intercommunication state with the circuit board that sets up in the electric core body outside, promoted the practicality of tab structure effectively.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a partial perspective view of a battery provided in an embodiment of the present utility model;

FIG. 2 is a schematic view, partially in section, of a battery provided in an embodiment of the present utility model;

fig. 3 is a schematic connection diagram of a positive electrode tab in the tab structure according to the embodiment of the present utility model;

fig. 4 is a schematic partial cutaway view of a positive electrode tab in a tab structure according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram showing the connection of a protector in a battery according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of a first bending portion of a tab structure according to an embodiment of the present utility model;

fig. 7 is a schematic view of a package in a battery according to an embodiment of the present utility model;

fig. 8 is a schematic view of a battery provided in an embodiment of the present utility model;

reference numerals illustrate:

1-a positive electrode tab; 11-a first connection section; 12-a second connection section; 121-a first bend; 13-a third connecting section;

2-a protective structure;

3-seals;

4-a negative electrode tab;

5-a battery cell body; 51-positive electrode structure; 52-negative electrode structure; 53-separator;

6-a circuit board;

7-packaging; 71-top seal; 72-side seals;

8-a protector; 81-fourth connection section; 82-a fifth connecting section; 821-first sub-connection section; 822-a second sub-connection section; 823-third sub-connection section; 83-sixth connection section; 831-second bend;

9-nickel flakes.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

The present embodiment provides a positive electrode tab, referring to fig. 1 to 6, which includes a first connection section 11, a second connection section 12 and a third connection section 13 that are sequentially connected, wherein the first connection section 11 is used for electrically connecting with an external electric core body 5, the second connection section 12 is bent to form at least one first bending part 121, and the third connection section 13 is used for electrically connecting with an external circuit board 6; the protection structure 2 is sleeved outside the first bending part 121. The first bending portion 121 is an aluminum layer, and the protection structure 2 is sleeved outside the aluminum layer, so as to form a structure as shown in fig. 6, that is, the protection structure 2 is coated outside the aluminum layer on any cross section of the extending direction of the first bending portion 121. It may be noted that, in the positive electrode tab provided in this embodiment, the number of the first bending portions 121 is not limited, and only needs to be determined by a developer according to the required compressive strength, for example, in this embodiment, the number of the first bending portions 121 is selected to be three, that is, the second connecting section 12 is bent three times, and meanwhile, a certain included angle is formed between the opening directions of adjacent first bending portions 121, which may be 180 ° in this embodiment, that is, as shown in fig. 3 and 4; the battery can also be at any angle (not shown in the figure) between 90 degrees and 180 degrees, and finally forms a double-U-shaped telescopic structure, so that the adverse risks of breakage and the like caused by stress of the root of the positive electrode tab 1 when the battery is tested in mechanical reliability can be reduced. In this embodiment, after the second connection section 12 is bent three times, three first bending portions 121 are formed, and the opening directions of the three first bending portions 121 are respectively opposite to the head of the battery core body 5, and opposite to the head of the battery core body 5, so as to form a double-U-shaped tab structure.

It may be noted that, when the protection structure 2 is provided, the protection structure 2 may be further sleeved on the whole outer side of the second connection section 12, so that not only the first bending portion 121 may be protected, but also the rest of the second connection section 12 may be protected. Specifically, when the whole second connecting section is formed by an aluminum layer and the outside of the whole second connecting section 12 is sleeved by the protection structure 2, any cross section along the extending direction of the second connecting section can have the effect similar to that shown in fig. 6, the protection structure 2 is sleeved on the outside of the aluminum layer, and the aluminum layer is covered by the protection structure 2 to realize protection.

It should be noted that, since the method of increasing the strength commonly used in the industry is to thicken, that is, to increase the thickness of the tab, but this causes a loss of battery capacity, the battery provided in this embodiment, as shown in fig. 3 and 4, only increases the strength of the second connection section 12, but does not perform any treatment on the first connection section 11 and the third connection section 13.

It should be noted that, the material of the protection structure 2 is not limited by the positive electrode tab provided in this embodiment, and only the bending strength and the tensile strength of the second connection section 12 need to be increased, and the material compatible with aluminum may be selected; meanwhile, if necessary, other protective materials are needed to make the protective structure 2 have the characteristics of high temperature resistance, wear resistance, corrosion resistance and the like. As one embodiment, the protection structure 2 is a hard oxide layer.

It may be noted that, the positive electrode tab provided in this embodiment may be used for welding with an external circuit board 6, and correspondingly, an external welding section for welding with the external circuit board 6 needs to be reserved in the positive electrode tab 1, where the external welding section may be the whole third connecting section 13 mentioned in this embodiment, or may be a part of the third connecting section 13, and the third connecting section 13 needs to reserve an external welding section with a length of 1.5mm to 4mm, so that the subsequent welding requirement for different products is convenient.

Through setting up the second linkage segment 12 of anodal utmost point ear 1 and bending and forming first kink 121, can make anodal utmost point ear 1 wholly cushion like this when rocking or drunkenness under the influence of external world, reduced the unexpected cracked risk of anodal utmost point ear 1, set up first kink 121 into the form of arranging protection architecture 2 inside again, can guarantee like this that second linkage segment 12 can not appear the phenomenon of fracture when buckling, guarantee anodal utmost point ear 1 and the circuit board 6 of setting in the cell body 5 outside be in the intercommunication state, promoted the practicality of anodal utmost point ear effectively.

Example 2

The present embodiment provides a tab structure, including the positive electrode tab in embodiment 1, and further including the negative electrode tab.

As shown in fig. 1 and fig. 2, the tab structure provided in this embodiment should keep the usage habit of the negative electrode tab 4 in the existing solution, so two ends of the negative electrode tab 4 are electrically connected with the external electric core body 5 and the external circuit board 6 respectively; in addition, in order to make the positive electrode tab 1 and the negative electrode tab 4 have the same buffer action, in this embodiment, the negative electrode tab 4 is also bent three times to form three third bent portions identical to the positive electrode tab 1, and at this time, the bent structures, the length dimensions, and the like of the third bent portions and the first bent portions 121 are identical.

It may be noted that, in the tab structure provided in this embodiment, one end of the negative electrode tab 4 is electrically connected to the battery core body 5, and the other end of the negative electrode tab 4 is electrically connected to the circuit board 6. In this embodiment, the negative electrode tab 4 and the positive electrode tab 1 may be disposed at a head portion of the cell body 5 at intervals.

In the tab structure provided in this embodiment, the material of the negative electrode tab 4 is not limited, and in order to conform to the usage habit of the conventional scheme, the negative electrode tab 4 is made of a nickel material, so that the strength of the negative electrode tab 4 is higher than that of the positive electrode tab 1 made of an aluminum material, and therefore, the negative electrode tab 4 may not be protected.

It can be stated that, the tab structure provided in this embodiment needs to reserve the length of 1.5mm to 4mm at the outside welding section of the negative electrode tab 4, so that the subsequent welding requirements for different products are facilitated. The outer welding section of the negative electrode tab 4 is matched with the third connecting section 13 of the positive electrode tab 1, the outer welding section of the negative electrode tab 4 is made of nickel material, the third connecting section 13 of the positive electrode tab 1 is made of aluminum material, and the third connecting section are both used for welding with the external circuit board 6.

Example 3

This embodiment provides a battery including the tab structure provided in embodiment 2.

As shown in fig. 1 and 2, the battery provided in this embodiment further includes a battery core body 5 and a circuit board 6. The circuit board 6 is disposed at the head of the battery core body 5, and the tab structure is connected with the battery core body 5 and the circuit board 6 respectively.

Because the positive electrode tab 1 and the circuit board 6 in the prior art are connected by the nickel sheet, as shown in fig. 1, 3 and 4, the battery provided in this embodiment further includes the nickel sheet 9. At this time, one end of the nickel plate 9 is soldered to the circuit board 6, and the other end of the nickel plate 9 is soldered to the third connecting section 13. As one of the embodiments, the nickel sheet 9 is provided in a U-shape, that is, the nickel sheet 9 is provided with a groove structure, the opening of the groove structure faces the third connecting section 13, a part of the structure of the third connecting section 13 is inserted into the groove structure of the nickel sheet 9, that is, the inner side wall of the U-shape structure is inserted, and then the inner side wall of the nickel sheet 9 and the inserted part of the third connecting section 13 are welded.

Further, in the battery provided in this embodiment, the outer side wall surface of the groove structure is welded to the circuit board 6. In this embodiment, the outer side wall surface of the groove structure includes wall surfaces other than the inner side wall, that is, a side wall surface, an upper end surface, a lower end surface, and the like, and after a part of the third connection section 13 is inserted into the groove structure of the nickel sheet 9 to be welded, one or more of the remaining wall surfaces of the groove structure are welded with the circuit board 6, so as to realize conduction between the positive electrode tab 1 and the circuit board 6, and conduction between the negative electrode tab 4 and the circuit board 6.

Because the aluminum plastic film of the battery and the exposed part of the tab in the prior art are in direct contact, short circuit can be caused, as shown in fig. 1, 2, 3, 4, 7 and 8, the battery provided in this embodiment further includes a package 7. Wherein, the packaging piece 7 is attached to the outer side wall surface of the battery cell body 5 to form a top sealing part 71 and a side sealing part 72, and the side sealing part 72 is arranged at two sides of the battery cell body 5 along the width direction and two sides of the top sealing part 71; in particular, in practice, the first connecting section 11 needs to be inserted through the top seal 71.

As shown in fig. 2, 3 and 5, the battery provided in this embodiment further includes a protection member 8. The protection member 8 includes a fourth connecting section 81, a fifth connecting section 82 and a sixth connecting section 83, which are sequentially connected, the fourth connecting section 81 is attached to an outer side wall surface of the top sealing portion 71, the sixth connecting section 83 is bent at an opening of the first bending portion 121 to form a second bending portion 831, and the sixth connecting section 83 is parallel to the fourth connecting section 81 and is attached to another outer side wall surface of the top sealing portion 71, so that the protection member 8 encloses and forms an installation cavity. In this embodiment, the mounting cavity is a hollow receiving cavity.

It may be noted that, in the battery provided in this embodiment, the fifth connection section 82 has a first sub-connection section 821, a second sub-connection section 822 and a third sub-connection section 823 that are sequentially connected, and the first sub-connection section 821 and the third sub-connection section 823 are parallel to a plane where the head of the battery cell body 5 is located, and the second sub-connection section 822 is perpendicular to the plane where the head of the battery cell body 5 is located. The third sub-connection section 823 is located below the first sub-connection section 821, and compared with the first sub-connection section, the third sub-connection section 823 is located closer to the head of the battery core body 5, one end of the third sub-connection section 823 is connected with the sixth connection section 83, the other end of the third sub-connection section 823 is connected with the second sub-connection section 822, the sixth connection section 83 is perpendicular to the plane where the head of the battery core body 5 is located and is attached to the other outer side wall surface of the top sealing portion 71, which is far away from the fourth connection section 81, and then the sixth connection section 83 is bent to form a second bending portion 831, which faces the opening of one of the first bending portions 121.

Further, at this time, the electrical components such as the circuit board 6 are disposed in the mounting cavity, and the electrical components are parallel to the second sub-connection section 822 of the fifth connection section 82, and the electrical components are disposed toward the second sub-connection section 822.

It should be noted that, in the battery provided in this embodiment, as shown in fig. 5, the second bending portion 831 is disposed near the first bending portion 121 on the side far from the circuit board 6, and the opening orientation of the second bending portion 831 may be the same as the opening orientation of the first bending portion 121.

As shown in fig. 1 and 8, the battery provided in this embodiment includes a battery cell body 5 including a positive electrode structure 51, a negative electrode structure 52, and a separator 53, where the positive electrode structure 51 and the negative electrode structure 52 are disposed at intervals and on both sides of the separator 53, respectively.

As shown in fig. 3 and 4, the positive electrode tab provided in this embodiment further includes a sealing member 3, and the sealing member 3 is disposed at a connection portion of the first connection section 11 and the second connection section 12.

It can be stated that the battery provided in this embodiment has a length of the sealing member 3 of 0.2mm to 2mm to accommodate different products.

In the battery provided in this embodiment, the type of the sealing member 3 is not limited, and in order to facilitate the packaging of the battery cell body 5, the sealing member 3 may be selected as a sealant.

It should be noted that, after the sealing glue seals the connection portion of the first connection section 11 and the second connection section 12, a part of the sealing glue needs to enter the top sealing portion 71 along the extending direction of the positive electrode tab 1, so as to achieve complete sealing at the top sealing portion 71, and effectively ensure the safety of the battery during use. In practical application, the cathode tab 4 is also provided with the same sealing member 3, i.e. sealant, and the specific setting manner is the same as that of the anode tab 1, which is not described in detail in this embodiment.

When the battery provided by the embodiment is produced and installed, a treatment scheme of increasing local strength is adopted, so that the protection structure 2 with higher bending resistance and tensile strength is formed on the second connecting section 12; subsequently, the sealing element 3 is arranged at the joint of the first connecting section 11 and the second connecting section 12, such as applying a sealing glue or the like; then, the positive electrode tab 1 and the negative electrode tab 4 are subjected to integral punching, the first connecting section 11 and the positive electrode structure 51 are welded, and the positive electrode structure 51, the diaphragm 53, the negative electrode structure 52, the packaging piece 7 and the like are assembled into the battery core body 5; then the components such as the circuit board 6 and the like are protected by using the protecting piece 8; cutting the positive electrode tab 1 and the negative electrode tab 4 into target values according to requirements; connecting the third connecting section 13 with the circuit board 6 through the nickel sheet 9, for example, welding the nickel sheet 9 with the circuit board 6, and then laser welding the third connecting section 13 and the nickel sheet 9 into a whole to form a semi-finished battery; then, bending the positive electrode tab 1 and the negative electrode tab 4 by using a bending jig, and it should be noted that the protecting member 8 is also bent to place components such as the circuit board 6 near the top sealing portion 71; and finally, the protection piece 8 is used for integrally wrapping the battery cell body 5 to form a battery.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A positive electrode tab, comprising:

the first connecting section (11), the second connecting section (12) and the third connecting section (13) are sequentially connected, the first connecting section (11) is used for being electrically connected with the external battery cell body (5), the second connecting section (12) is bent to form at least one first bending part (121), and the third connecting section (13) is used for being electrically connected with the external circuit board (6);

and the protection structure (2) is sleeved outside the first bending part (121).

2. The positive electrode tab of claim 1, wherein,

the second connecting section (12) is bent for three times to form three first bending parts (121), the first bending parts (121) are all of U-shaped structures, and included angles are formed between the opening directions of the adjacent first bending parts (121).

3. The positive electrode tab of claim 1, wherein,

the protection structure (2) is sleeved on the integral outer side of the second connecting section (12).

4. A tab structure, comprising:

a positive electrode tab as claimed in any one of claims 1 to 3;

and a negative electrode tab (4).

5. A battery, comprising:

a cell body (5);

the circuit board (6) is arranged at the head part of the battery cell body (5);

the electrode lug structure is as claimed in claim 4, and is respectively connected with the battery core body (5) and the circuit board (6).

6. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

the lithium ion battery also comprises a nickel sheet (9), wherein the positive electrode tab in the tab structure is welded with the circuit board (6) through the nickel sheet (9), and the nickel sheet (9) is provided with a groove structure; and part of the structure of the third connecting section (13) is inserted into the groove structure and welded with the inner side wall of the groove structure.

7. The battery of claim 5, further comprising:

the packaging piece (7), the packaging piece (7) is attached to the outer side wall surface of the battery cell body (5) to form a top sealing part (71) and side sealing parts (72), and the side sealing parts (72) are arranged on two sides of the battery cell body (5) along the width direction and two sides of the top sealing part (71);

the first connecting section (11) penetrates through the top sealing part (71).

8. The battery of claim 7, further comprising:

the protection piece (8), protection piece (8) are including fourth linkage segment (81), fifth linkage segment (82) and the sixth linkage segment (83) that connect gradually, fourth linkage segment (81) attach in top seal portion (71) lateral wall, sixth linkage segment (83) bend in the opening part of one of them first kink (121) and form second kink (831), sixth linkage segment (83) are on a parallel with fourth linkage segment (81) set up and attach in another lateral wall of top seal portion (71), so that protection piece (8) enclose and close and form the installation cavity.

9. The battery according to claim 8, wherein the fifth connection section (82) has a first sub-connection section (821), a second sub-connection section (822) and a third sub-connection section (823) which are sequentially connected, and the first sub-connection section (821) and the third sub-connection section (823) are parallel to a plane in which the head of the cell body (5) is located, and the second sub-connection section (822) is perpendicular to a plane in which the head of the cell body (5) is located, and the circuit board (6) is disposed in the mounting cavity.

10. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

also comprises a sealing element (3), wherein the sealing element (3) is arranged at the connecting part of the first connecting section (11) and the second connecting section (12).

Images