CN218101608U

CN218101608U - Battery, battery module and battery pack

Info

Publication number: CN218101608U
Application number: CN202222379278.7U
Authority: CN
Inventors: 王天顺; 韩延林
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2022-12-20
Anticipated expiration: 2032-09-07

Abstract

The utility model discloses a battery, battery module and battery package relates to the battery field. The battery comprises a top cover assembly and a battery cell, wherein the top cover assembly comprises a positive pole and a negative pole, a positive pole lug of the battery cell is connected with the positive pole, and a negative pole lug of the battery cell is connected with the negative pole; and a diaphragm connecting lug is arranged on a diaphragm of the battery cell and is in contact with the top cover assembly. The utility model provides a battery can fully absorb electrolyte, has better charge-discharge performance.

Description

Battery, battery module and battery pack

Technical Field

The utility model relates to a battery field particularly, relates to a battery, battery module and battery package.

Background

At present, in order to optimize the arrangement of the batteries, some battery packs on the market adopt the inverted arrangement of the batteries.

After the battery is inverted, the top cover assembly is positioned below the battery core, and because the components such as the negative electrode lug, the connecting sheet and the lower plastic are arranged between the battery core and the top cover sheet, a certain gap is generated between the battery core and the top cover assembly for isolation. Since the electrolyte filled in the gap does not contact the separator, it is difficult to absorb the electrolyte, thereby affecting the charge and discharge performance of the battery and the battery pack.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery, it has that electrolyte absorbs abundant, the better characteristics of charge-discharge performance.

Another object of the utility model is to provide a battery module, it has that electrolyte absorbs abundant, the better characteristics of charge-discharge performance.

Another object of the present invention is to provide a battery pack, which has the advantages of sufficient absorption of electrolyte and better charging and discharging performance.

The utility model provides a technical scheme:

a battery comprises a top cover assembly and a battery cell, wherein the top cover assembly comprises a positive pole and a negative pole, a positive pole lug of the battery cell is connected with the positive pole, and a negative pole lug of the battery cell is connected with the negative pole; and a diaphragm connecting lug is arranged on the diaphragm of the battery cell and is in contact with the top cover assembly.

Furthermore, the battery cell is provided with a connecting end, the connecting end and the top cover component are arranged oppositely, and the diaphragm connecting lug and the positive lug and the negative lug are all protruded out of the connecting end.

Further, the positive electrode tab, the diaphragm connecting tab and the negative electrode tab are sequentially arranged at intervals along a first direction on the connecting end.

Further, the planes of the positive tab, the negative tab and the diaphragm connecting tab are parallel to the first direction.

Further, the number of the diaphragm engaging lugs is multiple, the diaphragm engaging lugs are sequentially stacked and connected in a second direction, and the second direction is perpendicular to the first direction.

Further, the diaphragm connecting lug and the diaphragm of the battery cell are integrally formed.

Further, the top cap subassembly still includes top cap piece and lower plastic, the plastic sets up down the top cap piece is close to one side of electric core, the top cap piece with be provided with down between the plastic and accomodate the clearance, the diaphragm engaging lug is kept away from the one end embedding of electric core accomodate in the clearance.

The top cover assembly further comprises a positive connecting piece and a negative connecting piece, the positive connecting piece is arranged on one side, away from the top cover piece, of the lower plastic, and the positive lug is connected with the positive pole through the positive connecting piece;

the negative electrode connecting piece is arranged on one side, away from the top cover piece, of the lower plastic, and the negative electrode lug is connected with the negative electrode column through the negative electrode connecting piece.

The embodiment of the utility model provides a battery module, include the battery, the battery includes top cap subassembly and electric core, the anodal ear and/or the negative pole ear of electric core with top cap subassembly connects, be provided with the diaphragm engaging lug on the diaphragm of electric core, the diaphragm engaging lug with the contact of top cap subassembly. In a vertical direction, the battery cell is located above the top cover assembly.

An embodiment of the utility model provides a battery pack is still provided, include the battery module, the battery module include the battery, the battery includes top cap subassembly and electric core, the positive ear and/or the negative pole ear of electric core with the top cap subassembly is connected, be provided with the diaphragm engaging lug on the diaphragm of electric core, the diaphragm engaging lug with the contact of top cap subassembly. In the vertical direction, the battery cell is located above the top cover assembly.

Compared with the prior art, the utility model provides a battery is provided with the diaphragm engaging lug on its electric core diaphragm, the diaphragm engaging lug contacts with the top cap subassembly. In practical applications, when the battery is inverted, the electrolyte filled between the battery core and the cap assembly can still be absorbed by the diaphragm tabs. Therefore, the utility model provides a beneficial effect of battery includes: the electrolyte can be fully absorbed, and the charge and discharge performance is better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the battery cell in fig. 1;

fig. 3 is a schematic structural diagram of a diaphragm of the battery cell in fig. 2;

fig. 4 is a schematic view of a connection structure between the top cover plate and the lower plastic of the top cover assembly in fig. 1.

Icon: 100-a battery; 110-a cap assembly; 111-top cover sheet; 1111-positive pole; 1112-a negative pole post; 1115-a housing gap; 112-lower plastic cement; 113-positive connection piece; 114-negative electrode connection tab; 120-electric core; 121-positive tab; 122-negative tab; 123-a membrane; 124-diaphragm engaging lugs; 125-connecting end.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that a product of the present invention is usually placed when used, or orientations or positional relationships that a person skilled in the art usually understands, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be broadly construed, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect through an intermediate medium, and the connection may be internal to the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

Examples

Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery 100 provided in this embodiment.

The battery 100 provided in this embodiment includes a top cap assembly 110, a battery cell 120, and a casing (not shown in the drawings), wherein the battery cell 120 is accommodated in the casing, the top cap assembly 110 is connected to a tab of the battery cell 120 and covers the casing, an electrolyte is filled in the casing, and a gap is formed between the top cap assembly 110 and a main body of the battery cell 120, and the gap is also filled with the electrolyte. The diaphragm 123 of the battery cell 120 is provided with a diaphragm connecting lug 124, and the diaphragm connecting lug 124 is in contact with the cap assembly 110 and is used for absorbing electrolyte filled between the cap assembly 110 and the main body of the battery cell 120.

The top cover assembly 110 comprises a top cover plate 111, a lower plastic 112, a positive connecting plate 113 and a negative connecting plate 114, wherein the top cover plate 111 is provided with a positive post 1111 and a negative post 1112, the positive connecting plate 113 is arranged on one side of the lower plastic 112 far away from the top cover plate 111 and connected with the positive post 1111 through laser welding, and the negative connecting plate 114 is arranged on one side of the lower plastic 112 far away from the top cover plate 111 and connected with the negative post 1112 through the laser welding.

It is understood that the top cover assembly 110 may further include conventional elements and structures such as an upper plastic, a sealing ring, etc., which are not described in the embodiment.

The positive tab 121 of the battery cell 120 is connected to the positive connection tab 113 by ultrasonic welding, and the negative tab 122 is connected to the negative connection tab 114 by ultrasonic welding. It can be understood that, due to the existence of the positive tab 121, the negative tab 122, the positive connection tab 113 and the negative connection tab 114, the two groups of connection relationships necessarily occupy a certain space, that is, a gap necessarily exists between the battery cell 120 and the top cap assembly 110, and actually, the gap is a gap formed between the battery cell 120 and the lower plastic 112.

In a scenario where the actual battery 100 is applied upside down, the electrolyte filled in the gap between the battery cell 120 and the top cap assembly 110 is limited by gravity, and is always located in the gap and is not absorbed by the diaphragm 123 of the battery cell 120, that is, does not participate in the transportation of lithium ions, so that the transfer efficiency of the lithium ions in the charging and discharging processes is affected, that is, the charging and discharging performance of the battery 100 is affected. In order to solve the problem, the diaphragm 123 of the battery cell 120 is provided with the diaphragm engaging lug 124, and the diaphragm engaging lug 124 extends out of the main body of the battery cell 120 to contact with the top cover assembly 110, and actually contacts with the lower plastic 112 or the top cover sheet 111, so that the electrolyte in the gap is fully absorbed, and the charging and discharging performance of the battery 100 is improved.

In this embodiment, the battery cell 120 is provided with a connection end 125, the connection end 125 is disposed opposite to the top cap assembly 110, and the diaphragm connection tab 124, the positive tab 121, and the negative tab 122 all protrude from the connection end 125. In other embodiments, one of the positive posts 1111 and the negative posts 1112 may be disposed at the top end of the housing, i.e. only the remaining one of the positive posts 1111 and the negative posts 1112 is disposed on the top cover assembly 110. In this case, only the tab corresponding to the terminal post on the top cap assembly 110 may be protruded from the connection end 125 of the battery cell 120, and the tab of the other polarity is connected to the casing through the end of the battery cell 120 away from the connection end 125.

For example, in another embodiment, only the positive post 1111 is disposed on the top cover sheet 111 of the top cover assembly 110, only the positive tab 121 and the diaphragm connecting tab 124 of the battery cell 120 protrude from the connecting end 125, the positive tab 121 is connected to the positive post 1111 through the positive connecting sheet 113, and the diaphragm connecting tab 124 is in contact with the top cover assembly 110.

In fact, the tab and diaphragm connecting tab 124 may protrude from the battery cell 120 from the same direction, and may also protrude from the battery cell 120 from different directions. For example, in yet another embodiment, the battery cells 120 are laterally tab-extended, that is, the positive tab 121 and the negative tab 122 of the battery cell 120 are horizontally extended from the body of the battery cell 120, and the top cap assembly 110 is vertically above or below the body of the battery cell 120. In this case, the diaphragm engaging lug 124 may protrude laterally from the battery cell 120, that is, the diaphragm engaging lug 124 protrudes from the battery cell 120 and is bent in the vertical direction and extends to contact with the top cap assembly 110; the diaphragm coupling lug 124 may also protrude from the battery cell 120 in a vertical direction corresponding to one side of the top cover assembly 110, and linearly extend to contact with the top cover assembly 110.

Referring to fig. 2 and fig. 3 in combination, fig. 2 is a schematic structural diagram of the battery cell 120 in fig. 1, and fig. 3 is a schematic structural diagram of the diaphragm 123 of the battery cell 120.

In this embodiment, the positive tab 121, the diaphragm tab 124, and the negative tab 122 are sequentially arranged at intervals along the first direction on the connection end 125. The first direction is a direction indicated by an arrow X in fig. 2, the positive tab 121, the diaphragm tab 124, and the negative tab 122 are disposed at intervals in the first direction, that is, the diaphragm tab 124 is located between the positive tab 121 and the negative tab 122, and also plays a role in isolating the positive tab 121 from the negative tab 122, so as to prevent the positive and negative short circuits from occurring due to deformation of the battery cell 120.

In practice, the planes of the positive tab 121, the negative tab 122, and the separator tab 124 are all parallel to the first direction. It is understood that the positive electrode tab 121, the negative electrode tab 122, and the separator connection tab 124 do not overlap regardless of the lamination structure or the winding structure of the battery cell 120.

The number of the diaphragm engaging lugs 124 is plural, and the plural diaphragm engaging lugs 124 are sequentially stacked and connected in a second direction perpendicular to the first direction, which is a direction indicated by a Y arrow in fig. 2. The second direction actually refers to a horizontal direction perpendicular to the first direction, i.e., the second direction is parallel to a plane in which the connection end 125 is located.

It can be understood that if the battery cell 120 provided in the present embodiment is a laminated structure, each layer of the separator 123 is provided with a separator engaging lug 124, and if the battery cell 120 is a wound structure, the separator 123 is provided with a plurality of separator engaging lugs 124 at intervals.

It should be noted that the diaphragm engaging lug 124 is actually a part of the diaphragm 123, and in order not to destroy the structural integrity of the diaphragm 123 and not to affect the normal passage of lithium ions, the diaphragm engaging lug 124 is integrally formed with the diaphragm 123 of the battery cell 120 in this embodiment. In the actual manufacturing process, the diaphragm engaging lug 124 is directly formed on the diaphragm 123 by cutting the diaphragm 123.

Referring to fig. 4, fig. 4 is a schematic view illustrating a connection structure between a top cover sheet 111 and a lower plastic 112 of a top cover assembly 110.

Considering that the diaphragm 123 is made of a flexible material, the diaphragm engaging lug 124 formed on the diaphragm 123 may move out of contact with the top cap assembly 110 due to vibration of the battery 100 and other reasons. In order to solve the problem, in the embodiment, a receiving gap 1115 is disposed between the top cover sheet 111 and the lower plastic 112 of the top cover assembly 110, and an end of the diaphragm engaging lug 124 away from the battery cell 120 is inserted into the receiving gap 1115.

In practical application, after one end of the diaphragm engaging lug 124, which is far away from the battery core 120, extends into the receiving gap 1115, the receiving gap 1115 plays a role in fixing the diaphragm engaging lug 124, so that the diaphragm engaging lug 124 can sufficiently absorb electrolyte filled in the gap between the lower plastic 112 and the battery core 120.

In this embodiment, a concave notch is formed on one side of lower plastic 112 close to top cover sheet 111, and top cover sheet 111 covers the notch, thereby defining a receiving gap 1115. In other embodiments, the securing of the septum attachment ears 124 may be accomplished in other ways. For example, a hook may be provided on the lower plastic 112 to hook the diaphragm coupling lug 124 thereon.

The present embodiment further provides a battery 100 module, where the battery 100 module includes a plurality of the aforementioned batteries 100, and the plurality of batteries 100 are all inverted, that is, in the vertical direction, the battery core 120 is located above the top cover assembly 110. The battery 100 module further includes conventional components such as bus bars, which are not described in this embodiment.

In addition, the embodiment further provides a battery 100 pack, which includes a box body and the battery 100 module, wherein the battery 100 module is accommodated in the box body.

In summary, the battery 100 provided in this embodiment can fully absorb the electrolyte, thereby having better charge and discharge performance. Therefore, the battery 100 module and the battery 100 pack provided with the battery 100 according to the present embodiment have the characteristics of better charging and discharging performance.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 protection scope of the present invention.

Claims

1. A battery is characterized by comprising a top cover assembly and a battery cell, wherein the top cover assembly comprises a positive pole and a negative pole, a positive pole ear of the battery cell is connected with the positive pole, and a negative pole ear of the battery cell is connected with the negative pole; and a diaphragm connecting lug is arranged on the diaphragm of the battery cell and is in contact with the top cover assembly.

2. The battery of claim 1, wherein the battery core is provided with a connection end, the connection end is arranged opposite to the top cover assembly, and the diaphragm connection lug, the positive electrode lug and the negative electrode lug are all protruded from the connection end.

3. The battery of claim 2, wherein the positive tab, the separator tab, and the negative tab are sequentially spaced along a first direction on the connection end.

4. The battery of claim 3, wherein the positive tab, the negative tab, and the separator tab each lie in a plane that is parallel to the first direction.

5. The battery according to claim 3, wherein the number of the separator tabs is plural, and a plurality of the separator tabs are sequentially stacked and connected in a second direction perpendicular to the first direction.

6. The battery of any of claims 1-5, wherein the membrane tabs are integrally formed with the membrane of the cell.

7. The battery of any one of claims 1-5, wherein the top cap assembly further comprises a top cap piece and a lower plastic, the lower plastic is disposed on a side of the top cap piece close to the battery cell, a receiving gap is disposed between the top cap piece and the lower plastic, one end of the diaphragm engaging lug, which is far away from the battery cell, is embedded into the receiving gap, and the diaphragm engaging lug is in contact with the lower plastic.

8. The battery of claim 7, wherein the top cap assembly further comprises a positive connecting tab and a negative connecting tab, the positive connecting tab is disposed on a side of the lower plastic away from the top cap piece, and the positive tab is connected to the positive post through the positive connecting tab;

the negative pole connection piece is arranged on one side, away from the top cover piece, of the lower plastic, and the negative pole lug is connected with the negative pole column through the negative pole connection piece.

9. A battery module comprising the battery of any of claims 1-8, wherein the cells are positioned above the cap assembly in a vertical orientation.

10. A battery pack comprising the battery module according to claim 9.