CN218783202U

CN218783202U - Pole piece and battery cell

Info

Publication number: CN218783202U
Application number: CN202223361585.9U
Authority: CN
Inventors: 张宇; 屈永辉; 肖芳芳; 李聪; 陈贤锐; 纪荣进; 郑明清
Original assignee: Zhejiang Liwei Energy Technology Co ltd
Current assignee: Zhejiang Liwei Energy Technology Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-03-31
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a pole piece, include: the buffer body is provided with a first welding area, a bending area and a second welding area, and the first welding area is connected with the current collector. The utility model also discloses an electricity core, include: positive plate, negative plate and diaphragm. The first weld zone of the buffer body is connected with the mass flow body, the second weld zone of the buffer body is connected with the utmost point ear, be connected with the district of buckling between first weld zone and second weld zone, setting through the district of buckling, make the second weld zone can relative motion with first weld zone, and then make utmost point ear and mass flow body relative motion, receive the impact back in the use, because the design of buckling in district, make utmost point ear have certain activity space, play the cushioning effect, even utmost point ear after because of the impact takes off, still can keep keeping the circuit with being connected of mass flow body and switching on through the buffer body, the phenomenon of breaking circuit is avoided appearing, the anti-falling performance and the stability ability of battery have been promoted greatly.

Description

Pole piece and battery cell

Technical Field

The utility model relates to a battery technology field specifically, relates to a pole piece and electric core.

Background

Lithium ion batteries are a new generation of chemical energy which is recently developed and widely used, and are used in mobile phones, notebook computers and other scenes. The power supply has the characteristics of long service life, high energy density, small size, safety and the like, and becomes a preferred power supply of mobile terminal energy.

In the use, the condition of collision, falling and striking can appear in the inevitable, and above condition all can lead to the fact the impact to the electric core of battery, and one of common problem is exactly that the fracture phenomenon appears in the junction of leading to mass flow body and utmost point ear, and then makes mass flow body and utmost point ear break away from, and final battery is because the unable normal use that opens circuit.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a pole piece and electric core.

The utility model discloses a pole piece, include: the buffer body is provided with a first welding area, a bending area and a second welding area, the first welding area is connected with the current collector, the first welding area is connected with the second welding area through the bending area, and the lug is arranged on the second welding area; wherein, the first welding area and the second welding area can move relatively through the bending area.

According to the utility model discloses an embodiment, the district of buckling is buckled towards the direction of being close to the mass flow body.

According to the utility model discloses an embodiment, the district of buckling is buckled towards the direction of keeping away from the mass flow body.

According to the utility model discloses an embodiment, the quantity in first weld zone and the district of buckling is two, and two first weld zone intervals set up and connect the mass flow body, and two districts of buckling are connected with two first weld zones respectively, and the second weld zone is located between two districts of buckling, and two districts of buckling of second weld zone connection.

According to the utility model discloses an embodiment, the quantity of the buffering body is at least two, connects through first welding area between the buffering body, and just two at least buffering bodies are located one side or both sides of the mass flow body.

According to the utility model discloses an embodiment, the district of buckling on the adjacent buffering body is buckled towards the direction of keeping away from and being close to the mass flow body respectively.

According to the utility model discloses an embodiment, the quantity of the buffering body is at least two, and two at least buffering bodies distribute in the both sides of the mass flow body.

According to the utility model discloses an embodiment, the district of buckling of mass flow body one side is buckled towards the direction of keeping away from the mass flow body, and the district of buckling of mass flow body opposite side is buckled towards the direction of being close to the mass flow body.

According to the utility model discloses an embodiment, the district of buckling distributes along the length direction or the width direction of mass flow body.

The utility model discloses an electric core, include: the positive plate and/or the negative plate adopt a plate structure.

The beneficial effects of the utility model reside in that, through the mass flow body, the cooperation setting of buffer body and utmost point ear, the first weld zone and the mass flow body coupling of buffer body, the second weld zone and the utmost point ear coupling of buffer body, be connected with the district of buckling between first weld zone and second weld zone, setting through the district of buckling, make second weld zone and first weld zone can relative motion, and then make utmost point ear and mass flow body relative motion, receive the impact back in the use, because the design of buckling in the district, make utmost point ear have certain activity space, play the cushioning effect, even utmost point ear after falling off because of the impact, still can keep keeping the circuit with being connected of mass flow body and switching on through the buffer body, the phenomenon of circuit breaking has avoided appearing, the anti-falling performance and the stability ability of battery have been promoted greatly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a front view of a pole piece;

FIG. 2 is another elevation view of the pole piece;

FIG. 3 is one of the cross-sectional views of the pole piece;

FIG. 4 is a second cross-sectional view of the pole piece;

FIG. 5 is a third cross-sectional view of a pole piece;

FIG. 6 is a fourth cross-sectional view of the pole piece;

FIG. 7 is a fifth cross-sectional view of a pole piece;

FIG. 8 is a sixth cross-sectional view of a pole piece;

FIG. 9 is a seventh cross-sectional view of the pole piece;

FIG. 10 is an eighth cross-sectional view of a pole piece;

FIG. 11 is a ninth cross-sectional view of a pole piece;

FIG. 12 is ten of cross-sectional views of the pole pieces;

FIG. 13 is an eleventh cross-sectional view of a pole piece.

Description of reference numerals:

1-current collector;

2-a buffer; 21-a first welding zone; 22-a bending zone; 23-a second welding zone;

and 3-pole ear.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Example one

As shown in fig. 1-3, fig. 1 is a front view of a pole piece; FIG. 2 is another elevation view of the pole piece; fig. 3 is one of cross-sectional views of a pole piece. The pole piece comprises a current collector 1, a buffer body 2 and a pole lug 3, wherein the buffer body 2 is connected with the current collector 1, and the pole lug 3 is arranged on the buffer body 2. Further, the buffer 2 may be formed along the length L of the current collector 1, or may be formed along the width W of the current collector 1, in this embodiment, the buffer 2 is formed along the length L.

In a specific application, the material of the buffer body 2 may be determined according to the usage scenario, for example, when the pole piece is used as a positive pole piece, the current collector 1 is made of aluminum, the buffer body 2 is made of aluminum, and the thickness of the buffer body 2 is greater than that of the current collector 1, specifically, the thickness of the buffer body 2 is greater than or equal to 8 μm; for another example, when the electrode sheet is used as a negative electrode sheet, the current collector 1 is made of copper, the buffer 2 is made of copper, and the thickness of the buffer 2 is greater than that of the current collector 1, specifically, the thickness of the buffer 2 is greater than or equal to 4 μm.

The buffer body 2 is provided with a first welding area 21, a bending area 22 and a second welding area 23, the first welding area 21 is connected with the current collector 1, the bending area 22 is connected with the first welding area 21 and the second welding area 23, and the pole ear 3 is arranged on the second welding area 23. Specifically, the number of the first welding areas 21 and the number of the bending areas 22 are two, the two first welding areas 21 are spaced apart from each other and are connected to the current collector 1, the two bending areas 22 are respectively connected to the two first welding areas 21, and the second welding area 23 is connected to the two bending areas 22. In this embodiment, the bending region 22 bends toward a direction away from the current collector 1. Specifically, in order to facilitate the connection of the tab 3 with the second weld zone 23, the cross-sectional area of the second weld zone 23 is greater than that of the tab 3. The first welding zone 21 and the current collector 1 and the second welding zone 23 and the tab 3 can be welded together, for example, by ultrasonic welding, resistance welding, laser welding, etc. Furthermore, in order to achieve a better buffering effect, the size of the bending region 22 in the width W direction is greater than 2.5mm; in order to enhance the connection firmness of the first welding area 21 and the current collector 1, the size of the first welding area 21 in the width W direction is larger than 2mm. The current collector 1 exposed outside the first welding area 21 has a width of 1.5mm or less.

Example two

Fig. 4 is a second cross-sectional view of the pole piece, as shown in fig. 4. The structure of this embodiment is substantially the same as that of the first embodiment, and the difference is that: the number of the buffer bodies 2 is two, and the two buffer bodies 2 are respectively positioned on two sides of the current collector 1.

EXAMPLE III

As shown in fig. 5, fig. 5 is a third cross-sectional view of the pole piece. The structure of this embodiment is basically the same as that of the second embodiment, and the difference is that: the quantity of buffer 2 is two, and a first welding area 21 on two buffer 2 is connected, forms the combination of buffer 2, and another first welding area 21 on two buffer 2 all is connected with mass flow body 1.

Example four

As shown in fig. 6, fig. 6 is a fourth cross-sectional view of the pole piece. The structure of this embodiment is basically the same as that of the third embodiment, and the difference is that: the combination body of the buffer body 2 is arranged on both sides of the current collector 1.

EXAMPLE five

As shown in fig. 7, fig. 7 is a fifth cross-sectional view of the pole piece. The structure of this embodiment is substantially the same as that of the first embodiment, and the difference is: the bent region 22 is bent toward the current collector 1.

EXAMPLE six

As shown in fig. 8, fig. 8 is a sixth cross-sectional view of the pole piece. The structure of this embodiment is substantially the same as that of the fifth embodiment, and the difference is that: the number of the buffer bodies 2 is two, and the two buffer bodies 2 are respectively arranged on two sides of the current collector 1.

EXAMPLE seven

As shown in fig. 9, fig. 9 is a seventh cross-sectional view of the pole piece. The structure of this embodiment is substantially the same as that of the fifth embodiment, and the difference is that the number of the buffer bodies 2 is two, one first welding area 21 on two buffer bodies 2 is connected to form an assembly of the buffer bodies 2, and the other first welding area 21 on two buffer bodies 2 is connected to the current collector 1.

Example eight

As shown in fig. 10, fig. 10 is an eighth cross-sectional view of the pole piece. The structure of this embodiment is substantially the same as that of the seventh embodiment, and the difference is that the number of the combined bodies of the buffer bodies 2 is also two, and the combined bodies of the two buffer bodies 2 are respectively located on both sides of the current collector 1.

Example nine

As shown in fig. 11, fig. 11 is a ninth cross-sectional view of the pole piece. The structure of the present embodiment is similar to that of the second embodiment or the sixth embodiment, and the difference is that the number of the buffer bodies 2 is two, wherein the bending region 22 of one buffer body 2 bends toward the direction close to the current collector 1, and the bending region 22 of the other buffer body 2 bends toward the direction away from the current collector 1; and two buffer bodies 2 are respectively positioned at both sides of the current collector 1.

Example ten

As shown in fig. 12, fig. 12 is ten cross-sectional views of the pole piece. The structure of the present embodiment is similar to that of the third or seventh embodiment, and the difference is that the number of the buffer bodies 2 is two, the bending region 22 of one buffer body 2 bends toward the current collector 1, and the bending region 22 of the other buffer body 2 bends toward the direction away from the current collector 1, so as to connect one of the first welding regions 21 on the two buffer bodies 2, thereby forming an assembly of the buffer bodies 2.

EXAMPLE eleven

As shown in fig. 13, fig. 13 is an eleventh cross-sectional view of the pole piece. The structure of this embodiment is substantially the same as that of embodiment ten, and the difference is: in this embodiment, the number of the assemblies formed by the two buffer bodies 2 is also two, and the two assemblies are respectively located on two sides of the current collector 1.

Although the number of the buffer bodies 2 is two in the above listed embodiments, the number is not limited, and in the embodiments, the number is merely described in detail as an example, and is not limited to the number of the buffer bodies 2, that is, in practical applications, the number of the buffer bodies 2 may be increased or decreased according to requirements, and since the number of the buffer members cannot be exhaustive, the number of the buffer members is not listed here.

Example twelve

The battery cell comprises a positive plate, a negative plate and a diaphragm, wherein the diaphragm is positioned between the positive plate and the negative plate, and the positive plate, the negative plate and the diaphragm are superposed and then wound. In this embodiment, either the positive electrode sheet or the negative electrode sheet has any one of the electrode sheet structures of the first to eleventh embodiments, and the other one has a conventional electrode sheet structure.

EXAMPLE thirteen

The structure of this embodiment is substantially the same as that of the twelfth embodiment, except that: in this embodiment, the positive electrode plate and the negative electrode plate all adopt any one of the electrode plate structures of the first embodiment to the eleventh embodiment.

In summary, through the matching arrangement of the current collector 1, the buffer body 2 and the tab 3, the first welding region 21 of the buffer body 2 is connected with the current collector 1, the second welding region 23 of the buffer body 2 is connected with the tab 3, the bending region 22 is connected between the first welding region 21 and the second welding region 23, and through the arrangement of the bending region 22, the second welding region 23 and the first welding region 21 can move relatively, so that the tab 3 and the current collector 1 can move relatively, after being impacted in the using process, the tab 3 has a certain moving space due to the bending design of the bending region 22, so as to play a role of buffering, even if the tab 3 falls off due to impact, the connection between the tab and the current collector 1 can be maintained through the buffer body 2, so that the phenomenon of circuit breaking is avoided, and the falling resistance and stability of the battery are greatly improved.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A pole piece, comprising: the current collector comprises a current collector body (1), a buffer body (2) and a tab (3), wherein the buffer body (2) is provided with a first welding area (21), a bending area (22) and a second welding area (23), the first welding area (21) is connected with the current collector body (1), the first welding area (21) is connected with the second welding area (23) through the bending area (22), and the tab (3) is arranged on the second welding area (23); wherein the first welding area (21) and the second welding area (23) are movable relative to each other by the bending area (22).

2. The pole piece according to claim 1, characterized in that the bending zone (22) is bent towards the direction of approach of the current collector (1).

3. Pole piece according to claim 1, characterized in that the bending zone (22) is bent away from the current collector (1).

4. The pole piece according to claim 2 or 3, characterized in that the number of the first welding areas (21) and the bending areas (22) is two, two first welding areas (21) are arranged at intervals and connected with the current collector (1), two bending areas (22) are respectively connected with the two first welding areas (21), the second welding area (23) is located between the two bending areas (22), and the second welding area (23) is connected with the two bending areas (22).

5. The pole piece according to claim 4, characterized in that the number of said buffer bodies (2) is at least two, said buffer bodies (2) are connected by said first welding area (21), and at least two of said buffer bodies (2) are located on one or both sides of said current collector (1).

6. The pole piece according to claim 5, characterized in that the bending areas (22) on adjacent buffer bodies (2) are bent away from and close to the current collector (1), respectively.

7. The pole piece according to claim 4, characterized in that the number of the buffer bodies (2) is at least two, and at least two buffer bodies (2) are distributed on two sides of the current collector (1).

8. The pole piece of claim 7, wherein the bending area (22) on one side of the current collector (1) is bent in a direction away from the current collector (1), and the bending area (22) on the other side of the current collector (1) is bent in a direction close to the current collector (1).

9. The pole piece according to claim 4, characterized in that the bending zones (22) are distributed along the length direction or the width direction of the current collector (1).

10. An electrical core, comprising: the positive plate, the negative plate and the diaphragm, wherein the positive plate and/or the negative plate adopts the pole piece structure of any one of claims 1 to 9.