CN210744062U

CN210744062U - Utmost point ear structure and lithium cell

Info

Publication number: CN210744062U
Application number: CN201921732907.1U
Authority: CN
Inventors: 付洪利; 赵瑞瑞; 刘亮亮; 祝媛; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-06-12
Anticipated expiration: 2029-10-15

Abstract

The utility model relates to a lithium cell technical field specifically discloses a utmost point ear structure and lithium cell. The utility model discloses a utmost point ear structure is including being applied to the lithium cell, the lithium cell is including the book core and the casing that are provided with positive pole junction and negative pole junction, the casing is insulating with rolling up a core, utmost point ear structure includes first insulation piece and first utmost point ear, first insulation piece sets up in the terminal surface of rolling up a core, first utmost point ear includes the first connection structure of being connected with negative pole or positive pole junction and with the first structure of buckling that is connected of buckling, first structure of buckling sets up in the one side that first insulation piece deviates from the book core, first connection structure connects in the casing. The first bending structure absorbs vibration caused by external force, and can prevent breakage caused by pulling of external force. The first insulation piece covers the terminal surface of rolling up the core, arranges the first structure of buckling in the one side of keeping away from rolling up the core on the first insulation piece, not only makes and keeps insulating between first utmost point ear and the roll core, can also provide limiting displacement for first utmost point ear.

Description

Utmost point ear structure and lithium cell

Technical Field

The utility model relates to a lithium cell technical field especially relates to a utmost point ear structure and lithium cell.

Background

People can not use lithium batteries in the life of the current society, such as lithium batteries with high energy density. The lithium battery comprises a winding core storing electric energy and provided with a positive electrode connecting part and a negative electrode connecting part and a shell provided with a positive electrode and a negative electrode, wherein the winding core is connected with the shell through a pole lug, and when a power transmission end of a power consumption device is correspondingly connected to the positive electrode and the negative electrode of the lithium battery shell, the lithium battery can provide electric energy for the power consumption device. However, in some application scenarios, the lithium battery is inevitably subjected to external force, and the caused vibration may cause the tab to break, so that the power supply of the lithium battery fails, and even causes the risk of internal short circuit.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a utmost point ear structure, its antivibration, prevent that fracture is effectual.

Another object of the embodiment is to provide a lithium cell, its anti vibration is effectual, reduces the risk that the battery became invalid.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

the first aspect provides a tab structure, tab structure is applied to the lithium cell, the lithium cell is including the book core and the casing that are provided with positive junction and negative pole junction, tab structure includes first insulation piece and first utmost point ear, the casing with it is insulating to roll up the core, first insulation piece set up in roll up the terminal surface of core, first utmost point ear include with the negative pole junction or the first structure of buckling that positive junction connects and with the first connection structure that the structure of buckling is connected, first structure of buckling set up in the one side that first insulation piece deviates from the book core, so that first utmost point ear with it is insulating to roll up the core, first connection structure connect in the casing, the casing can electrically conduct.

As a preferable mode of the tab structure, the first bending structure is bent and extended along a direction of an end face of the winding core.

As a preferable mode of the tab structure, the first bending structure includes any one of a W-shaped, Z-shaped, S-shaped, and spiral-shaped structure having a spring characteristic.

As a preferred scheme of utmost point ear structure, utmost point ear structure still include the second utmost point ear with stack in the second insulating piece of first insulating piece, the second insulating piece with first insulating piece is provided with second through-hole and first through-hole respectively, the one end of second utmost point ear is passed the second through-hole with connect behind the first through-hole not another electrode junction that first utmost point ear is connected.

As an optimal scheme of the tab structure, the second tab includes a second bending structure and a second connection structure connected with the second bending structure, the second bending structure is arranged in the second insulation sheet deviating from the surface of the winding core, the first bending structure is arranged in the second insulation sheet and between the first insulation sheets, so that the second tab is insulated with the first tab.

As a preferred scheme of the tab structure, the lithium battery further comprises a cap hermetically arranged at one end of the shell and insulated from the shell, the second connecting structure is connected to the cap, and the cap is conductive.

As a preferable scheme of the tab structure, the first tab, except for a connection portion of the first bending structure and the negative electrode connection portion or the positive electrode connection portion, and a connection portion of the first connection structure and the casing, is provided with an insulating glue.

As a preferable scheme of the pole lug structure, the thickness of the first pole lug is D, and D is more than 0mm and less than or equal to 0.15 mm.

As a preferable mode of the tab structure, the first insulating sheet is made of any one of insulating plastics of PP, PET, and PFA.

In a second aspect, a lithium battery is provided, which comprises a winding core, a shell and a tab structure, wherein the shell is insulated by the winding core, the tab structure is connected with the winding core and the shell, and the shell can conduct electricity.

The utility model discloses beneficial effect does:

through set up first insulation piece in lithium cell inside, form utmost point ear structure with first utmost point ear, and the constitution of first utmost point ear include the first structure of buckling and the first connection structure of being connected with the first structure of buckling that negative pole junction or anodal junction are connected, make first utmost point ear can be through the casing that can electrically conduct in the first connection structure connection lithium cell, can also absorb the vibration that exogenic action arouses through first structure of buckling, and first structure of buckling is ductility in addition, can prevent to receive the fracture that external force dragged the arouse. In addition, the first insulation sheet is arranged on the end face of the winding core, and the first bending structure is arranged on the first insulation sheet, so that insulation is kept between the first tab and the winding core, and the first tab can be supported.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a structural cross-sectional view of a tab structure according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a first tab and a second tab according to another embodiment of the present invention.

Fig. 3 is a cross-sectional view of a lithium battery according to another embodiment of the present invention.

In the figure:

1. a tab structure; 11. a first insulating sheet; 111. a first through hole; 12. a first tab; 121. a first bending structure; 122. a first connecting structure; 13. a second tab; 131. a second bending structure; 132. a second connecting structure; 14. a second insulating sheet; 141. a second through hole; 15. insulating glue;

2. a winding core; 21. a positive electrode junction; 22. a negative electrode junction;

3. a housing;

4. and (7) capping.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, an embodiment of the present invention provides a tab structure 1, where the tab structure 1 of this embodiment can be applied to a variety of storage batteries including tabs, such as a lithium battery, the lithium battery may include a winding core 2 provided with a positive connection point 21 and a negative connection point 22, and a case 3 insulated from the winding core 2, the tab structure 1 includes a first insulating sheet 11 and a first tab 12, the first insulating sheet 11 is disposed on an end surface of the winding core 2, the first tab 12 includes a first bending structure 121 connected to the negative connection point 22 or the positive connection point 21, and a first connecting structure 122 connected to the first bending structure 121, the first bending structure 121 is disposed on a surface of the first insulating sheet 11 facing away from the winding core 2, so as to insulate the first tab 12 from the winding core 2, the first connecting structure 122 is connected to the case 3, where the case 3 is conductive, or as a first electrode terminal to which the electrical consumer is to be connected.

Through set up first insulating sheet 11 in the lithium cell inside, and form utmost point ear structure 1 with first utmost point ear 12, and first utmost point ear 12 constitute including the first structure of buckling 121 and the first connection structure 122 of being connected with first structure of buckling 121 that negative pole junction 22 or positive pole junction 21 are connected, make first utmost point ear 12 can be through the casing 3 of first connection structure 122 connection lithium cell, can also absorb the vibration that the exogenic action arouses through first structure of buckling 121, and the department of buckling of first structure of buckling 121 can move about, it has the ductility, can prevent to receive the fracture that external force dragged the arouse. In addition, set up first insulation piece 11 in the terminal surface of rolling up core 2, still place first bending structure 121 in the one side of keeping away from rolling up core 2 on first insulation piece 11, not only make and keep insulating between first utmost point ear 12 and the rolling up core 2, can also provide the spacing effect of support for first utmost point ear 12.

In practical applications, the bending extending direction of the first bending structure 121 may be various, however, the first bending structure 121 may exhibit the characteristic of a spring when the bending extending direction is stressed, and in one embodiment, referring to fig. 1, the first bending structure 121 may be bent and extended along the facing direction of the end surface of the winding core 2, so that the first bending structure 121 has the characteristic of a spring in the facing direction of the end surface, and can absorb stronger external force vibration compared with other bending extending directions, thereby further improving the vibration resistance.

In addition, the shape structure of the first bending structure 121 may be various, and in order to further enhance the spring characteristic of the first bending structure 121, in one embodiment, the first bending structure 121 may be a structure having a spring characteristic including any one of a W shape, a Z shape, an S shape, and a spiral shape. In addition to the spring characteristic, the W-shaped or Z-shaped first bending structure 121 can exhibit excellent compression resistance, the S-shaped first bending structure 121 can exhibit excellent tension resistance, and the spiral-shaped first bending structure 121 can exhibit both compression resistance and tension resistance, so that the vibration resistance and fracture resistance of the first tab 12 of the present embodiment are further enhanced.

Also, in one embodiment, referring to fig. 1, the tab structure 1 may further include a second tab 13 and a second insulation sheet 14 stacked on the first insulation sheet 11, the second insulation sheet 14 and the first insulation sheet 11 being provided with a second through hole 141 and a first through hole 111, respectively, such that one end of the second tab 13 passes through the second through hole 141 and the first through hole 111 to be connected to another electrode connection point other than the first bent structure 121, if the first tab 12 is connected with the negative pole junction 22, the second tab 13 is connected with the positive pole junction 21, so that the necessary insulation state between the winding core 2 and the second pole lug 13 can be ensured by the second insulation sheet 14 and the first insulation sheet 11, the second lug 13 can be connected with the anode connecting part 21 or the cathode connecting part 22 of the winding core 2 in the shortest distance, and the second through hole 141 and the first through hole 111 can also provide a limiting effect on the second lug 13.

Further, in another embodiment, referring to fig. 1, the second tab 13 may further include a second bending structure 131 and a second connecting structure 132 connected to the second bending structure 131, the second bending structure 131 is disposed on a side of the second insulating sheet 14 away from the winding core 2, and the first bending structure 121 is disposed between the second insulating sheet 14 and the first insulating sheet 11, so that the second tab 13 is insulated from the first tab 12, and meanwhile, the second insulating sheet 14 and the first insulating sheet 11 can also provide a clamping limiting effect for the first tab 12.

Particularly, in an embodiment, the second bending structure 131 may also have the same shape and structure, or the same bending and extending direction, or the same shape and structure and bending and extending direction as the first bending structure 121, so as to achieve the same effect as the first bending structure 121.

The structure of the second electrode terminal in the lithium battery can be various, and in an embodiment, referring to fig. 1, the lithium battery can further include a cap 4 hermetically disposed at one end of the casing 3 and insulated from the casing 3, and the second connecting structure 132 is connected to the cap 4, and the cap 4 is electrically conductive, and can not only serve as the second electrode terminal of the lithium battery, but also serve as a packaging structure of the lithium battery, and the casing 3 is wrapped by an outer layer of the fixed lithium battery.

In an embodiment, in order to increase the connection efficiency of the first tab 12 and the housing 3, the connection point of the first tab 12 and the housing 3 may be a welded structure formed after spot welding, and in order to facilitate detachment after connection, the connection point of the first tab 12 and the housing 3 may also be a riveted structure formed after riveting, which is not particularly limited in this embodiment.

Similarly, in another example, the joint of the second tab 13 and the cap 4 may also be a welded structure formed after spot welding or a riveted structure formed after riveting, and the obtained effect is similar to that of the previous embodiment, and is not described again in this embodiment.

In order to further enhance the insulating ability of the first tab 12, in another embodiment, referring to fig. 1 and fig. 2, besides the connection portion of the first bending structure 121 and the negative electrode connection 22 or the positive electrode connection 21 and the connection portion of the first connection structure 122 and the housing 3, an insulating glue 15 is disposed in the first tab 12, and the insulating glue 15 may wrap a main body portion of the first tab 12 to form a wrapping structure, so that the first tab 12 is prevented from being oxidized and touched by the second tab 13 or other conductive objects, thereby avoiding the occurrence of a short circuit condition. Similarly, in another embodiment, the insulating glue 15 may be disposed on the second tab 13 except for the connection portion between the second bending structure 131 and the negative electrode connection 22 or the positive electrode connection 21, and the connection portion between the second connection structure 132 and the cap 4, so that the effect achieved is similar to that of the previous embodiment, and the description of this embodiment is omitted.

In one embodiment, the first tab 12 may be made of any one of pure nickel, nickel-plated, stainless steel and copper, and in another embodiment, the second tab 13 may also be made of any one of pure nickel, nickel-plated, stainless steel and copper. In addition, in other embodiments, the first tab 12 or the second tab 13 may also be made of sheet metal, which facilitates processing into a bent spring structure while ensuring good electrical conductivity.

For the design of the first tab 12, in one example, the thickness of the first tab 12 may be set as D, and the thickness range of D is 0mm < D ≦ 0.15mm, so that while ensuring sufficient structural strength and bendable degree, manufacturing materials are saved and processing is facilitated.

Correspondingly, as for the design of the first insulating sheet 11, in one example, the first insulating sheet 11 may be made of any one of insulating plastics of PP (Polypropylene), PET (Polyethylene terephthalate), PFA (polytetrafluoroethylene). Wherein, PP is a semi-crystalline thermoplastic plastic, has higher impact resistance and strong mechanical property, and can resist corrosion of various organic solvents and acid and alkali; the PET has excellent abrasion and friction resistance, dimensional stability and electrical insulation, and meanwhile, the product has the characteristics of high strength, good transparency, no toxicity, seepage prevention, light weight, high production efficiency and the like; PFA has the characteristics of chemical corrosion resistance, low friction coefficient, electric insulation, energy consumption and the like. The first insulating sheet 11 made of any one of PP, PET and PFA has not only excellent electrical insulation but also performance characteristics corresponding to each plastic material.

Referring to fig. 3, the embodiment of the present invention further provides a lithium battery, including rolling up core 2, casing 3 and utmost point ear structure 1, casing 3 and rolling up core 2 are insulating, and utmost point ear structure 1 is connected in rolling up core 2 and casing 3, and casing 3 is electrically conductive. The tab structure 1 in this embodiment may have the same structure and achieve the same effect as the tab structure 1 in the above embodiment, and details are not repeated in this embodiment.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in a descriptive sense or positional relationship based on the orientation or positional relationship shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a tab structure, tab structure is applied to the lithium cell, the lithium cell is including the book core and the casing that are provided with anodal junction and negative pole junction, the casing with it is insulating to roll up the core, a serial communication port, tab structure includes first insulation piece and first utmost point ear, first insulation piece set up in roll up the terminal surface of core, first utmost point ear include with the negative pole junction or the first structure of buckling that anodal junction is connected and with the first connection structure that the first structure of buckling is connected, first structure of buckling set up in the one side that first insulation piece deviates from the book core, so that first utmost point ear with it is insulating to roll up the core, first connection structure connect in the casing, the casing can electrically conduct.

2. The tab structure as claimed in claim 1, wherein the first bending structure is bent and extended in a direction toward the end surface of the winding core.

3. The tab structure as claimed in claim 1, wherein the first bending structure includes a structure having a spring characteristic in any one of a W shape, a Z shape, an S shape, and a spiral shape.

4. The tab structure of claim 1, further comprising a second tab and a second insulation sheet stacked on the first insulation sheet, wherein the second insulation sheet and the first insulation sheet are respectively provided with a second through hole and a first through hole, and one end of the second tab passes through the second through hole and the first through hole and then is connected to another electrode connection part to which the first tab is not connected.

5. The tab structure of claim 4, wherein the second tab comprises a second bending structure and a second connecting structure connected to the second bending structure, the second bending structure is disposed on a surface of the second insulating sheet facing away from the winding core, and the first bending structure is disposed between the second insulating sheet and the first insulating sheet, so that the second tab is insulated from the first tab.

6. The tab structure of claim 5, wherein the lithium battery further comprises a cap sealingly disposed at one end of the housing and insulated from the housing, the second connection structure being connected to the cap, the cap being electrically conductive.

7. The tab structure of claim 1, wherein the first tab is provided with an insulating glue except for a connection portion of the first bent structure and the negative electrode connection site or the positive electrode connection site and a connection portion of the first connection structure and the housing.

8. The tab structure as claimed in any one of claims 1 to 7, wherein the first tab has a thickness D, and 0mm < D ≦ 0.15 mm.

9. The tab structure as claimed in any one of claims 1 to 7, wherein the first insulation sheet is made of any one of insulation plastics of PP, PET, PFA.

10. A lithium battery comprising a winding core, a housing and the tab structure of any of claims 1-9, wherein the housing is insulated from the winding core, the tab structure is connected to the winding core and the housing, and the housing is electrically conductive.