CN217562786U - Battery with a battery cell - Google Patents

Abstract

The utility model relates to a battery technology field provides a battery. The battery includes: a battery case; the battery comprises a battery cell, a battery shell and a battery cover, wherein the battery cell is arranged in the battery shell and comprises a battery cell main body and a tab part, and the tab part extends out of the side surface of the battery cell main body; a first insulating film covering at least a part of the cell main body; the second insulating film is independent of the first insulating film, the second insulating film covers the upper surface of the first insulating film and covers at least part of the lug part, and the first insulating film is located between the battery cell main body and the second insulating film, so that the first insulating film and the second insulating film can insulate the battery cell and the battery shell.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery technology field especially relates to a battery.

Background

In the related art, the electric core of the battery is arranged in the battery shell, and due to the structural limitation of the electric core and the lug part, the electric core and the battery shell are easy to have insulation failure risks.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery to improve the performance of battery.

The utility model provides a battery, include:

a battery case;

the battery comprises a battery cell, wherein the battery cell is arranged in a battery shell and comprises a battery cell main body and a lug part, and the lug part extends out from the side surface of the battery cell main body;

a first insulating film covering at least a part of the cell main body;

and a second insulating film provided separately from the first insulating film, the second insulating film covering an upper surface of the first insulating film and covering at least a part of the tab portion, the first insulating film being located between the cell main body and the second insulating film.

The utility model discloses battery of embodiment includes battery case, electric core, first insulating film and second insulating film, and first insulating film covers the at least part of electric core main part, and the second insulating film is connected in first insulating film, and covers utmost point ear portion setting to can make first insulating film and second insulating film realize the insulation to electric core and battery case. The second insulating film is arranged independently of the first insulating film, so that the first insulating film and the second insulating film can be conveniently installed, the assembly efficiency of the battery is improved, the second insulating film is connected to the first insulating film, the installation stability of the first insulating film and the second insulating film can be guaranteed, the first insulating film and the second insulating film are guaranteed to reliably insulate the battery core and the battery shell, and the safety performance of the battery is improved.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram of a battery shown in accordance with an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a partially exploded structure of a battery according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating the internal structure of a battery according to an exemplary embodiment;

FIG. 4 is an enlarged, fragmentary, schematic view of the interior of a battery according to one exemplary embodiment;

FIG. 5 is a schematic diagram illustrating a partial structure of a battery according to an exemplary embodiment;

FIG. 6 is a partially enlarged schematic structural view of a portion of a battery according to an exemplary embodiment;

FIG. 7 is a partial schematic diagram of a battery according to one exemplary embodiment;

fig. 8 is a partial structural view of a second segment and cell of a battery according to an exemplary embodiment;

fig. 9 is a partial structural view of a first insulating film and a cell of a battery according to an exemplary embodiment;

fig. 10 is a schematic diagram showing the structure of a first insulating film of a battery according to an exemplary embodiment;

fig. 11 is a flow diagram illustrating a method of manufacturing a battery according to an exemplary embodiment.

The reference numerals are illustrated below:

10. a battery case; 11. a first housing member; 12. a second housing member; 13. sinking; 20. an electric core; 21. a cell main body; 211. a first surface; 212. a second surface; 22. a pole ear portion; 221. a first bending region; 222. a second bending region; 30. a first insulating film; 31. a first end; 32. a second end; 33. a main body part; 34. an extension portion; 40. a second insulating film; 41. a first stage; 42. a second stage; 50. a third insulating film; 60. a patch; 70. and (4) a pole component.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, so it should be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and encompass, for example, a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery, please refer to fig. 1 to fig. 10, the battery includes: a battery case 10; the battery comprises a battery cell 20, the battery cell 20 is arranged in the battery shell 10, the battery cell 20 includes a cell main body 21 and a tab portion 22, and the tab portion 22 extends from a side surface of the cell main body 21; a first insulating film 30, the first insulating film 30 covering at least a portion of the cell main body 21; and a second insulating film 40, the second insulating film 40 being provided separately from the first insulating film 30, the second insulating film 40 being provided so as to cover an upper surface of the first insulating film 30 and to cover at least a part of the lug portion 22, the first insulating film 30 being located between the cell main body 21 and the second insulating film 40.

The battery of an embodiment of the present invention includes a battery case 10, a battery cell 20, a first insulating film 30 and a second insulating film 40, wherein the first insulating film 30 covers at least a portion of the battery cell main body 21, the second insulating film 40 is connected to the first insulating film 30, and covers the electrode lug 22, so that the first insulating film 30 and the second insulating film 40 can be used to insulate the battery cell 20 and the battery case 10. Since the second insulating film 40 is provided separately from the first insulating film 30, the mounting of the first insulating film 30 and the second insulating film 40 can be facilitated, thereby improving the assembly efficiency of the battery, and the mounting stability of the first insulating film 30 and the second insulating film 40 can be ensured by connecting the second insulating film 40 to the first insulating film 30, thereby ensuring that the first insulating film 30 and the second insulating film 40 achieve reliable insulation of the battery cell 20 and the battery case 10, thereby improving the safety performance of the battery.

Note that, the first insulating film 30 covers at least a portion of the cell main body 21, the second insulating film 40 is disposed to cover the lug portion 22, and the second insulating film 40 is connected to the first insulating film 30, so that the stability of the disposition of the first insulating film 30 and the second insulating film 40 can be ensured, thereby ensuring that the first insulating film 30 realizes reliable insulation of the cell main body 21 and the battery case 10, and the second insulating film 40 realizes reliable insulation of the lug portion 22 and the battery case 10.

The first insulating film 30 covers at least a portion of the cell main body 21, and the second insulating film 40 covers an upper surface of the first insulating film 30, i.e., the second insulating film 40 is located above the first insulating film 30, so that the first insulating film 30 can be located between the cell main body 21 and the second insulating film 40, thereby ensuring that the first insulating film 30 reliably covers the cell main body 21.

Utmost point ear 22 in electric core main part 21 need be through the formation of restrainting the bending type, and through the second insulating film 40 that is provided with on the surface at utmost point ear 22, not only can guarantee to insulate between utmost point ear 22 and the battery case 10 and set up, and when utmost point ear 22 was restrainted and was buckled, the frock can be buckled second insulating film 40 and drive utmost point ear 22 and buckle, be convenient for retrain utmost point ear 22, appear the warpage when preventing utmost point ear 22 from restrainting and fall the bits, thereby improve the assembly efficiency and the yield of battery, reduce the inside safe risk of battery.

The second insulating film 40 is provided independently of the first insulating film 30, that is, the first insulating film 30 and the second insulating film 40 can be easily mounted, not only can the mounting positions of the first insulating film 30 and the second insulating film 40 be effectively controlled, after all, components having a relatively small structure can be more easily mounted, and the first insulating film 30 and the second insulating film 40 themselves are easily wrinkled, and therefore, the above-mentioned problem can be avoided by independently mounting the first insulating film 30 and the second insulating film 40, so that the mounting efficiency of the first insulating film 30 and the second insulating film 40 can be improved, and the mounting quality of the first insulating film 30 and the second insulating film 40 can be ensured.

In one embodiment, the first insulating film 30 may be a mylar film. The second insulating film 40 may include a PET tape or a PI tape, etc., and for example, the second insulating film 40 may be a blue PET tape.

In one embodiment, the second insulating film 40 is provided with a glue layer, and the second insulating film 40 is adhered to the first insulating film 30, so that the second insulating film 40 can be reliably connected to the first insulating film 30, thereby fixing the first insulating film 30 and avoiding the insulation failure of the cell main body 21 caused by the cracking of the first insulating film 30. The second insulating film 40 may be bonded to the tab portion 22 by a glue layer, and further, the second insulating film 40 may be bonded to the cell main body 21 by a glue layer. The adhesive layer may be a colloid in the related art, for example, an adhesive or a structural adhesive, and the like.

In one embodiment, the first insulating film 30 is not provided with a glue layer, that is, the first insulating film 30 may cover the cell main body 21, so that the first insulating film 30 may be conveniently covered on the cell main body 21, and it may be ensured that the first insulating film 30 may be smoothly covered on the cell main body 21, and the first insulating film 30 may be prevented from being wrinkled due to the glue layer, so that flatness of the first insulating film 30 and the second insulating film 40 may be ensured when the first insulating film 30 is subsequently connected through the second insulating film 40, thereby improving the covering quality of the battery and ensuring the safety performance of the battery.

In one embodiment, the second insulating film 40 is partially adhered to the surface of the first insulating film 30 away from the cell body 21, and is partially adhered to the surface of the cell body 21 not covered by the first insulating film 30, that is, the second insulating film 40 is partially adhered to the first insulating film 30, and the second insulating film 40 is partially adhered to the cell body 21, so that the first insulating film 30 can be firmly fixed to the cell body 21, the relative displacement between the first insulating film 30 and the cell body 21 can be prevented, the cell body 21 can be prevented from directly contacting the battery casing 10 after being exposed, and the second insulating film 40 can also be used for insulating and protecting the battery casing 10 and the cell body 21.

In one embodiment, the first insulating film 30 includes a first end 31 and a second end 32 opposite to each other, and the second insulating film 40 connects the first end 31 and the second end 32, so that the first insulating film 30 and the second insulating film 40 can be connected, and the first insulating film 30 can be ensured to stably cover the cell main body 21.

The first end 31 and the second end 32 may directly abut, and in some embodiments, it is not excluded that the first end 31 and the second end 32 are spaced apart, but the first insulating film 30 is formed with an overlapping portion, i.e., one of the first end 31 and the second end 32 is covered by the first insulating film 30.

In one embodiment, as shown in fig. 9, the first insulating film 30 includes a first end 31 and a second end 32 opposite to each other, a gap is formed between the first end 31 and the second end 32 to expose a portion of the cell main body 21, the second insulating film 40 connects the first end 31 and the second end 32, and the second insulating film 40 covers the gap, so that the second insulating film 40 can be partially adhered to the first insulating film 30, and the second insulating film 40 is partially adhered to the cell main body 21 to firmly fix the first insulating film 30 to the cell main body 21, thereby preventing relative displacement between the first insulating film 30 and the cell main body 21.

As shown in fig. 3, the second insulating film 40 is connected to the first insulating film 30. Both ends of the second insulating film 40 may extend onto the two lug parts 22, respectively, to thereby cover the lug parts 22. In one embodiment, as shown in fig. 9 and 10, the first insulating film 30 includes a main body portion 33 and an extending portion 34, the main body portion 33 covers a portion of the cell main body 21, and the extending portion 34 extends from an end of the main body portion 33 along a first direction to be disposed beyond the cell main body 21, so that the extending portion 34 can be used for realizing insulation protection between the counter electrode lug portion 22 and the battery case 10, thereby improving the safety performance of the battery. The second insulating film 40 is connected to the main body portion 33.

In one embodiment, the extension portion 34 extends from a part of the end of the main body portion 33, so that the width of the extension portion 34 is smaller than that of the main body portion 33, that is, a gap is formed between two ends of the extension portion 34 along the circumferential direction of the main body portion 33, which can reduce the size of the extension portion 34, but does not affect the extension portion 34 to achieve insulation protection between the tab portion 22 and the battery case 10.

As shown in fig. 9 and 10, the extension 34 is formed in a U-shape, and the extension 34 can protect the electrode tab 22 and the battery case 10 from each other.

The width of the main body 33 refers to the size of the end of the main body 33, and correspondingly, the width of the extension 34 refers to the length of the extension 34 connected to the end of the main body 33.

In some embodiments, it is not excluded that the extension 34 extends from all of the end of the main body portion 33, such that the width of the extension 34 is equal to the width of the main body portion 33.

In one embodiment, as shown in fig. 3 to 7, the second insulating film 40 includes a first section 41 and a second section 42, the first section 41 connects the first end 31 and the second end 32, the second section 42 is connected to the first section 41 and covers the electrode ear 22, so that the first section 41 is partially adhered to the first insulating film 30, the first section 41 is partially adhered to the cell main body 21, so that the first insulating film 30 is firmly fixed to the cell main body 21, the relative displacement between the first insulating film 30 and the cell main body 21 is prevented, the cell main body 21 is prevented from directly contacting the battery case 10 after being exposed, and the second section 42 can achieve insulation protection between the electrode ear 22 and the battery case 10.

It should be noted that, the first section 41 covers the cell main body 21, the second section 42 covers the pole ear portion 22, and the second section 42 is connected to the first section 41, so as to ensure the stability of the arrangement of the first section 41 and the second section 42, thereby ensuring that the first section 41 realizes reliable insulation of the cell main body 21 and the battery case 10, and the second section 42 realizes reliable insulation of the pole ear portion 22 and the battery case 10.

Utmost point ear 22 on electric core main part 21 is many to be required to be buckled and is formed through binding up, and through being provided with second section 42 on the surface at utmost point ear 22, not only can guarantee to insulate between utmost point ear 22 and the battery case 10 and set up, and when utmost point ear 22 was bound up and is buckled, the frock can be buckled second section 42 and drive utmost point ear 22 and buckle, be convenient for retrain utmost point ear 22, appear the warpage when preventing utmost point ear 22 from binding up and fall the bits, thereby improve the assembly efficiency and the yield of battery, reduce the inside safe risk of battery.

The battery cell 20 includes a battery cell main body 21 and two tab portions 22, the two tab portions 22 may be respectively located on two opposite sides of the battery cell main body 21, one tab portion 22 extends from one side surface of the battery cell main body 21 along a first direction, the other tab portion 22 extends from the other side surface of the battery cell main body 21 along a second direction, the first direction and the second direction are opposite, the second section 42 may be two, and the two second sections 42 respectively cover the two tab portions 22, as shown in fig. 3 and 5.

In one embodiment, the first section 41 may be PET tape or PI tape, etc., for example, the first section 41 may be blue PET tape. Second section 42 may be PET tape or PI tape, etc., for example, second section 42 may be blue PET tape.

In one embodiment, the width of the second section 42 is greater than that of the first section 41 along the width direction of the cell main body 21, and the second section 42 is connected to the first section 41, so that the first section 41 can reliably cover the cell main body 21, thereby ensuring that the first section 41 and the second section 42 reliably insulate the cell 20 and the battery shell 10, and improving the safety performance of the battery.

In one embodiment, the width of the second section 42 is greater than the width of the tab portion 22 along the width direction of the cell main body 21, so as to prevent two ends of the tab portion 22 from exceeding two ends of the second section 42 along the width direction of the cell main body 21, that is, to ensure that two ends of the tab portion 22 do not exceed two ends of the second section 42, thereby realizing reliable covering of the tab portion 22 by the second section 42, and thus ensuring that an insulation arrangement is formed between the tab portion 22 and the battery case 10, thereby improving the safety performance of the battery. The width direction of the cell main body 21 is parallel to the width direction of the tab part 22, and the width direction of the tab part 22 is perpendicular to the direction in which the tab part 22 is led out from the side of the cell main body 21.

In one embodiment, the first segment 41 extends from one end of the first insulating film 30 to the other end of the first insulating film 30 along the length direction of the cell body 21, so that the first segment 41 can reliably cover the first insulating film 30, thereby enabling the first insulating film 30 to reliably protect the cell body 21, thereby ensuring effective insulation between the battery case 10 and the cell body 21.

In one embodiment, the width of the second insulating film 40 is greater than the width of the lug part 22, and the width of the second insulating film 40 is smaller than the width of the cell main body 21, so that on the basis of ensuring that the second insulating film 40 can reliably cover the lug part 22, the problem of inconvenient installation due to the excessively large width of the second insulating film 40 can be avoided.

The tab 22 is sized to be the width of the tab 22 in a direction perpendicular to the direction in which the tab 22 is drawn out from the side of the cell main body 21.

The width of the second section 42 of the second insulating film 40 may be greater than the width of the tab portion 22, while the width of the second section 42 of the second insulating film 40 may be less than the width of the cell main body 21, the width of the first section 41 may be less than the width of the cell main body 21, while the width of the first section 41 may be greater than the width of the second section 42, or the width of the first section 41 may be less than the width of the second section 42.

In one embodiment, there are two tab portions 22, and the two tab portions 22 respectively extend from two opposite sides of the cell main body 21; the second insulating film 40 extends from one of the pole ear portions 22 to the other pole ear portion 22, so that the assembly efficiency of the second insulating film 40 can be improved, the second insulating film 40 can be ensured to reliably fix the first insulating film 30, and further the second insulating film 40 can be ensured to form reliable insulation protection for the two pole ear portions 22.

It should be noted that the tab portion 22 can be used to connect with the terminal assembly, and most of the tab portion 22 is exposed, and if no other insulating structure is provided between the tab portion 22 and the battery case 10, the risk of electrical connection between the tab portion 22 and the battery case 10 easily occurs. In this embodiment, second segment 42 is disposed to cover tab portion 22, and the two ends of tab portion 22 are not beyond the two ends of second segment 42, so that second segment 42 can effectively ensure the insulation arrangement between tab portion 22 and battery case 10.

In one embodiment, the tab portion 22 includes more than two single tabs extending from the side surface of the cell main body 21, and the tab portion 22 is formed after the multiple single tabs are gathered, so as to form a first bending area 221 on one side of the tab portion 22 close to the cell main body 21; wherein, second section 42 covers first bending region 221 to guarantee insulating setting between utmost point ear portion 22 and battery case 10, and second section 42 can be used for the frock to buckle a plurality of monolithic utmost point ears, appear the warpage when preventing with this that a plurality of monolithic utmost point ears from drawing in and fall the bits, thereby improve the assembly efficiency and the yield of battery, reduce the inside safety risk of battery.

The top of a plurality of monolithic utmost point ears can cover and have second section 42, when a plurality of monolithic utmost point ears were received and is restrainted and buckle, the frock can be buckled second section 42 and drive a plurality of monolithic utmost point ears and buckle, is convenient for retrain a plurality of monolithic utmost point ears, prevents that a plurality of monolithic utmost point ears from appearing the warpage and falling the bits when receiving and restrainting to improve the assembly efficiency and the yield of battery, reduce the inside safe risk of battery. When the plurality of single tabs are bundled and bent, a first bending region 221 as shown in fig. 7 and 8 may be formed.

It should be noted that the battery cell main body 21 includes more than two pole pieces, the tab portion 22 includes more than two single-piece tabs, the single-piece tabs respectively extend from the pole pieces corresponding to the single-piece tabs, the width of the single-piece tabs may be smaller than the width of the pole pieces, and a plurality of single-piece tabs are stacked to form the tab portion 22. Wherein the one-piece tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

In one embodiment, the length of the second section 42 exceeding the tab portion 22 is 1mm to 10mm along the width direction of the cell main body 21, which not only can ensure the reliable covering of the tab portion 22 by the second section 42, but also can avoid the problem of inconvenient installation and the like caused by the overlong second section 42.

The length of the second section 42 beyond the tab portion 22 in the width direction of the cell main body 21 may be 1mm, 1.1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 4.9mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.8mm, 9.9mm, 10mm, or the like.

Note that, both ends of the second segment 42 may be disposed beyond the tab portions 22 in the width direction of the cell main body 21. Alternatively, one end of the second segment 42 may be disposed beyond the tab portion 22 and the other end may be flush with the tab portion 22 in the width direction of the cell main body 21.

In one embodiment, as shown in fig. 7 and 8, the pole ear portion 22 is formed with a second bending region 222, and the second bending region 222 is located on a side of the first bending region 221 away from the cell main body 21; the first bending region 221 and the second bending region 222 are disposed at an interval. The second bending region 222 is formed to reduce the length of the lug portion 22 along the length direction of the cell main body 21, so as to reduce the space occupied by the lug portion 22 in the length direction, thereby not only saving the internal space of the battery case 10, but also avoiding the end portion of the lug portion 22 forming an electrical connection with the battery case 10.

In one embodiment, as shown in fig. 7 and 8, the second segment 42 also covers the second bending region 222, such that the second segment 42 ensures that the second bending region 222 does not form an electrical connection with the battery case 10.

Considering that the second bending region 222 may be located at the farthest end in the cell length direction, so that the possibility that the second bending region 222 contacts the battery case 10 may increase, the second segment 42 also covers the second bending region 222, so that the second segment 42 ensures reliable insulation between the second bending region 222 and the battery case 10.

In one embodiment, the end of the second segment 42 away from the cell main body 21 extends to between the second bending region 222 and the end of the tab 22 away from the cell main body 21, which not only ensures that the second segment 42 can reliably cover the second bending region 222, but also avoids the problem that the second segment 42 is too long and inconvenient to install and increases the cost.

In one embodiment, the end of the second segment 42 away from the cell main body 21 does not exceed the end of the tab portion 22 away from the cell main body 21, i.e., the length of the second segment 42 covering the tab portion 22 may be less than the length of the tab portion 22, so as to facilitate the arrangement of the second segment 42, and also ensure the reliable insulation between the second segment 42 and the tab portion 22 and the battery case 10.

In one embodiment, as shown in fig. 7, the battery further includes an interposer 60, the interposer 60 is disposed in the battery case 10, and the tab portion 22 covers a portion of the interposer 60; the tab portion 22 is bent from one end of the interposer 60 to form a second bending region 222, so that the tab portion 22 can be ensured to reliably cover a portion of the interposer 60, and the contact area between the tab portion 22 and the interposer 60 can be increased, thereby improving the overcurrent capacity of the tab portion 22 and the interposer 60.

In one embodiment, second segment 42 covers the side of ear portion 22 facing away from interposer 60 to ensure that second segment 42 can cover ear portion 22, ensure the insulating formation of ear portion 22, and prevent ear portion 22 from bending to generate metal dust that affects the overall safety of the battery.

As shown in fig. 7, after the tab portion 22 extends from the side surface of the cell main body 21, the tab portion 22 may be bent at one end of the adaptor sheet 60, so that the tab portion 22 covers the adaptor sheet 60, that is, a part of the tab portion 22 is located inside the adaptor sheet 60, at this time, the second section 42 may cover at least a part of the tab portion 22 located below the adaptor sheet 60, so that the tab portion 22 may be prevented from being bent to generate metal chips, thereby improving the insulating property of the second section 42.

In one embodiment, as shown in fig. 7, the second segment 42 is connected to the cell main body 21, so that not only the connection stability of the second segment 42 can be ensured, but also the second segment 42 can form an insulation protection for the cell main body 21.

In one embodiment, as shown in fig. 2, the cell main body 21 includes two oppositely disposed first surfaces 211 and four second surfaces 212 disposed around the first surfaces 211, and an area of the first surfaces 211 is larger than an area of the second surfaces 212; wherein second segment 42 is attached to first surface 211 and second segment 42 covers a large surface of ear 22, such that second segment 42 reliably protects ear 22 and provides reliable insulation protection.

It should be noted that the two opposing first surfaces 211 are large surfaces of the cell main body 21, the four second surfaces 212 are small surfaces of the cell main body 21, and the four second surfaces 212 include two pairs of small surfaces, that is, a first pair of small surfaces extending along the length direction of the cell main body 21 and a second pair of small surfaces extending along the width direction of the cell main body 21, and the area of the first pair of small surfaces is larger than that of the second pair of small surfaces, but smaller than that of the large surfaces. Two pole ear portions 22 may extend from a second pair of the minor surfaces, respectively.

Accordingly, the battery case 10 may include two large surfaces and four small surfaces, and the two large surfaces of the battery case 10 and the two large surfaces of the cell main body 21 are disposed opposite to each other, and the four small surfaces of the battery case 10 and the four small surfaces of the cell main body 21 are disposed opposite to each other.

When the single tab of the tab portion 22 is flattened, the single tab is parallel to the first surface 211, and the second segment 42 covers the tab portion 22, so that the second segment 42 can effectively protect the insulation between the tab portion 22 and the battery case 10.

In one embodiment, the second section 42 is disposed independently of the first section 41, the second section 42 is connected to the upper surface of the first section 41, and the width of the second section 42 is 5mm to 20mm longer than the width of the first section 41 in the width direction of the cell main body 21, so as to prevent two ends of the first section 41 from exceeding two ends of the second section 42 in the width direction of the cell main body 21, so that the second section 42 can be reliably pressed against the first section 41, thereby ensuring the connection stability of the first section 41, and the length of the second section 42 is not too long, thereby avoiding increasing the cost.

The width of the second section 42 is longer than the width of the first section 41 by 5mm, 6mm, 7mm, 10mm, 12mm, 15mm, 16mm, 18mm, 19mm, 20mm, or the like in the width direction of the cell main body 21.

In one embodiment, the second section 42 is integrally formed with the first section 41, so that the second insulating film 40 can cover the lug part 22 and the first insulating film 30 at one time, thereby improving the mounting efficiency of the second insulating film 40.

In one embodiment, the second section 42 is provided separately from the first section 41, and the second section 42 covers a portion of the first section 41, so that the second section 42 can be connected to the first section 41, and the second section 42 can be installed separately from the first section 41, thereby improving the accuracy of installation of the second section 42 to the first section 41.

In one embodiment, the second segment 42 also covers the surface of the cell main body 21 not covered by the first insulating film 30 and the first segment 41, so that the second segment 42 can be connected to the first insulating film 30, the cell main body 21, and the pole ear portion 22 at the same time, thereby ensuring the connection stability of the second segment 42 and improving the insulation protection range of the second segment 42.

In one embodiment, as shown in fig. 2, the cell body 21 includes two first surfaces 211 disposed opposite to each other and four second surfaces 212 disposed around the first surfaces 211, and an area of the first surfaces 211 is larger than an area of the second surfaces 212; wherein the first insulating film 30, the first segment 41 and the second segment 42 cover the same first surface 211. The first end 31 and the second end 32 of the first insulating film 30 are located on the first surface 211, in order to ensure that the first segment 41 can be connected to the first end 31 and the second end 32, and the first segment 41 covers the surface of the cell main body 21, at this time, the gap between the first end 31 and the second end 32 may be relatively large, thereby ensuring the connection stability of the first segment 41, and the second segment 42 can be ensured to cover the large surface of the tab part 22, thereby ensuring that the second segment 42 can achieve reliable insulation protection between the tab part 22 and the battery case 10.

In one embodiment, the first segment 41 covers a portion of the first surface 211; the area of the first section 41 covering the first surface 211 is not more than half of the area of the first surface 211, so that the first section 41 can be prevented from being too large to cause cost increase while the first section 41 can be fixed on the first insulating film 30, and the first section 41 can be conveniently arranged to improve the installation efficiency.

In one embodiment, as shown in fig. 3 to 5, the battery further includes a third insulating film 50, and the third insulating film 50 covers both one first surface 211 and two adjacent second surfaces 212, that is, the third insulating film 50 may cover corner regions of the cell main body 21, that is, corner regions of the cell main body 21, so as to ensure that the corner regions of the cell main body 21 are protected by the third insulating film 50, thereby improving the insulating performance between the cell main body 21 and the battery case 10.

In one embodiment, as shown in fig. 3 and 4, the first insulating film 30 covers a portion of the third insulating film 50, and the second insulating film 40 is bonded to the surface of the first insulating film 30 covering the first surface 211, so that the first insulating film 30 can form a fixation to the third insulating film 50, ensuring that the third insulating film 50 can reliably protect the corner region of the cell main body 21. The third insulating film 50 may be a PET tape or a PI tape, etc., and for example, the third insulating film 50 may be a blue PET tape.

In one embodiment, as shown in fig. 1 and 2, the battery further includes: the pole assembly 70, the pole assembly 70 is connected with the adapter sheet 60, and a part of the pole assembly 70 is positioned outside the battery shell 10; wherein, the pole assembly 70 is disposed on the large surface of the battery casing 10, so that the large surface of the battery casing 10 can provide sufficient supporting force for the pole assembly 70, thereby ensuring the stability of the pole assembly 70. The pole assembly 70 is connected to the adaptor sheet 60, and the adaptor sheet 60 is connected to the tab part 22, so that the pole assembly 70 serves as an electrode terminal of the battery. The pole assembly 70 and the interposer 60 may be welded, or the pole assembly 70 and the interposer 60 may be riveted.

In some embodiments, there are two pole assemblies 70, two pole assemblies 70 are a positive pole assembly and a negative pole assembly, respectively, each pole assembly 70 may include two poles for increasing the current capacity of the battery, there are two pole tabs 22, two pole ears 22 are a positive pole ear and a negative pole ear, respectively, the positive pole assembly is connected to the positive pole ear, and the negative pole assembly is connected to the negative pole ear.

It should be noted that the pole assembly 70 and the battery housing 10 may be insulated from each other, for example, an insulating member may be used for insulation between the two, or an insulating coating may be used for insulation, which is not limited herein and may be selected according to actual requirements.

In one embodiment, the battery housing 10 is provided with a recess 13, and the pole assembly 70 is located in the recess 13, so that the pole assembly 70 can be prevented from occupying the stacking space of the battery pack, thereby improving the energy density of the battery pack.

In one embodiment, as shown in fig. 1, a recess 13 is disposed on the battery housing 10, the post assembly 70 and the recess 13 are respectively located on two opposite surfaces of the battery housing 10, and the recess 13 is used for receiving the post assembly of another battery, so that when the batteries are grouped, the post assembly of another battery is received in the recess 13, the post assembly is prevented from occupying a space between two batteries, a distance between two adjacent batteries is reduced, and thus energy density of the battery group is improved.

In one embodiment, as shown in fig. 1 and 2, the pole assembly 70 may be two, the recess 13 may be two, the two pole assemblies 70 may be disposed on the same large surface of the battery housing 10, and the two recesses 13 may be disposed on the other large surface of the battery housing 10.

In one embodiment, as shown in fig. 2, the battery case 10 includes: a first housing part 11; a second housing part 12, the second housing part 12 being connected to the first housing part 11 to enclose the cells 20; the first housing member 11 is a flat plate.

In one embodiment, the pole assembly 70 can be disposed on the first housing part 11, and the first housing part 11 is a flat plate, which not only has a simple structure, but also facilitates the disposition of the pole assembly 70, thereby improving the molding efficiency of the battery.

In one embodiment, the battery case 10 may be made of stainless steel or aluminum, and has good corrosion resistance and sufficient strength. The battery case 10 is substantially rectangular.

It should be noted that the first housing member 11 and the second housing member 12 may be provided independently, as shown in fig. 2. In some embodiments, it is not excluded that the first housing part 11 and the second housing part 12 may be a unitary structure, with the space for accommodating the cell 20 being formed by stamping and subsequently being connected in a closed manner by welding.

In one embodiment, the length of the cell is a,400mm a 2800mm, the width of the cell is b, the height of the cell is c,2b a 80b, and/or 0.5c b 20c.

Further, b is more than or equal to 80mm and less than or equal to 200mm, and c is more than or equal to 10mm and less than or equal to 100mm.

Preferably, 4 b.ltoreq.a.ltoreq.25 b, and/or 2 c.ltoreq.b.ltoreq.10 c.

In the battery of the above embodiment, the ratio of the length to the width of the battery is large, and further, the ratio of the width to the height of the battery is large, while ensuring sufficient energy density.

In one embodiment, the length of the battery is a, the width of the battery is b, the a is more than or equal to 4b and less than or equal to 7b, namely, the ratio of the length to the width of the battery is larger in the embodiment, so that the energy density of the battery is increased, and the battery pack is convenient to form subsequently.

In one embodiment, the height of the battery is c, b is more than or equal to 3c and less than or equal to 7c, and the ratio of the width to the height of the battery is larger, so that the battery is convenient to form under the condition of ensuring enough energy density.

Alternatively, the length of the cell may be 800mm to 1800mm, the width of the cell may be 80mm to 180mm, and the height of the cell may be 15mm to 35mm.

The length of the battery is a dimension in the battery length direction, the width of the battery is a dimension in the battery width direction, and the height of the battery is a dimension in the battery height direction, that is, the thickness of the battery.

In one embodiment, the batteries are laminated batteries, which are convenient to pack and can be processed to obtain batteries with longer length.

The battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacking portion, wherein the stacking portion comprises a first pole piece, a partition and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. And the polarities of the first pole piece and the second pole piece can be interchanged.

Specifically, the battery cell 20 is a laminated battery cell, and the battery cell 20 has a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm disposed between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Optionally, the battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core.

An embodiment of the utility model also provides a group battery, and the group battery includes above-mentioned battery.

The battery of the battery pack according to an embodiment of the present invention includes a battery case 10, a battery cell 20, a first insulating film 30 and a second insulating film 40, the first insulating film 30 covers at least a portion of the battery cell main body 21, the second insulating film 40 is connected to the first insulating film 30, and the electrode ear portion 22 is covered, so that the first insulating film 30 and the second insulating film 40 can be used to insulate the battery cell 20 and the battery case 10. Since the second insulating film 40 is provided separately from the first insulating film 30, it is possible to facilitate the installation of the first insulating film 30 and the second insulating film 40, thereby improving the assembly efficiency of the battery, and to connect the second insulating film 40 to the first insulating film 30, it is possible to secure the installation stability of the first insulating film 30 and the second insulating film 40, thereby securing the first insulating film 30 and the second insulating film 40 to achieve reliable insulation of the battery cell 20 and the battery case 10, thereby improving the safety performance of the battery pack.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixing a plurality of batteries.

It should be noted that a plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed through the end plate and the side plate. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

An embodiment of the present invention further provides a method for manufacturing a battery, please refer to fig. 11, the method for manufacturing a battery includes:

s101, welding at least two single tabs to form tab parts 22 extending from the side surfaces of a battery cell main body 21;

s103, coating at least a portion of the cell body 21 with the first insulating film 30;

s105, the lug part 22 is covered with the second insulating film 40, and the second insulating film 40 is connected to the first insulating film 30, so that the second insulating film 40 covers the upper surface of the first insulating film 30, and the first insulating film 30 is located between the cell main body 21 and the second insulating film 40.

The utility model discloses a manufacturing method of battery of an embodiment passes through first insulating film 30 cladding electric core main part 21 at least partly, and second insulating film 40 covers utmost point ear portion 22 to make second insulating film 40 connect in first insulating film 30, can guarantee the installation stability of first insulating film 30 and second insulating film 40, guarantee with this that first insulating film 30 and second insulating film 40 realize the reliable insulation to electric core 20 and battery case 10, thereby improve the security performance of battery.

In one embodiment, after the lug part 22 extending from the side surface of the cell main body 21 is welded, the lug part 22 is covered by the second insulating film 40, and the second insulating film 40 is connected to the first insulating film 30, so that metal chips generated by welding and bending the lug part 22 can be encapsulated by the second insulating film 40, thereby avoiding the metal chips from causing electric connection analysis on the battery, and improving the safety performance of the battery.

In one embodiment, after the portion of the cell main body 21 is covered with the first insulating film 30, the tab 22 extending from the side surface of the cell main body 21 is welded, and the tab 22 may be formed of a plurality of single tabs.

The tab portion 22 may be formed by welding a plurality of single tabs, or by welding the tab portion 22 to the interposer 60.

In one embodiment, the second insulating film 40 is bonded from the tab part 22 and extended to the first insulating film 30, so that the mounting efficiency of the second insulating film 40 can be improved, thereby simplifying the mounting process of the second insulating film 40.

The second insulating film 40 may be considered to have an integrally formed structure in which the first stage 41 and the second stage 42 are adhered and extended from the tab part 22 to the first insulating film 30, so that the second insulating film 40 may cover the tab part 22 and the first insulating film 30 at one time, thereby improving the mounting efficiency of the second insulating film 40.

In one embodiment, the second insulating film 40 is bonded and extended from one of the tab portions 22 to the other of the tab portions 22, so that the assembly efficiency of the second insulating film 40 can be improved, the second insulating film 40 can be ensured to be capable of reliably fixing the first insulating film 30, and further, the second insulating film 40 can be ensured to be capable of reliably protecting the two tab portions 22 from being insulated. The second insulating film 40 is of an integrally formed structure, thereby facilitating the installation of the second insulating film 40.

In one embodiment, the second insulating film 40 includes a first segment 41 and a second segment 42 separately provided, and the first segment 41 and the second segment 42 are sequentially composed, for example, the first segment 41 is bonded to the first insulating film 30, the second segment 42 is bonded to the tab part 22, and the second segment 42 is connected to the first segment 41.

In one embodiment, the method of manufacturing a battery further comprises: before the portion of the cell main body 21 is coated with the first insulating film 30, the corner regions of the cell main body 21 are coated with the third insulating film 50; the first insulating film 30 covers the third insulating film 50, so that the first insulating film 30 can form a fixation to the third insulating film 50, and the corner regions of the cell main body 21 can be reliably protected by the third insulating film 50.

In one embodiment, the method of manufacturing a battery further comprises: the pole assembly 70 and the pole adapter plate 60 are welded.

In one embodiment, a method of manufacturing a battery is used to form the battery described above.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (15)

1. A battery, comprising:

a battery case (10);

the battery cell (20) is arranged in the battery shell (10), the battery cell (20) comprises a cell main body (21) and a tab part (22), and the tab part (22) extends out of the side surface of the cell main body (21);

a first insulating film (30), the first insulating film (30) covering at least a portion of the cell main body (21);

a second insulating film (40), the second insulating film (40) being disposed independently of the first insulating film (30), the second insulating film (40) covering an upper surface of the first insulating film (30) and covering at least a portion of the tab portion (22), the first insulating film (30) being located between the cell main body (21) and the second insulating film (40).

2. The battery according to claim 1, wherein the second insulating film (40) is partially adhered to the surface of the first insulating film (30) away from the cell body (21), and is partially adhered to the surface of the cell body (21) not covered by the first insulating film (30).

3. The battery according to claim 1, wherein the first insulating film (30) comprises a first end (31) and a second end (32) opposite to each other, and the second insulating film (40) connects the first end (31) and the second end (32).

4. The battery according to claim 3, wherein a gap is formed between the first end (31) and the second end (32) to expose a portion of the cell body (21), and the second insulating film (40) covers the gap.

5. The battery according to claim 3, wherein the second insulating film (40) includes a first segment (41) and a second segment (42), the first segment (41) connecting the first end (31) and the second end (32), the second segment (42) being connected to the first segment (41) and disposed to cover the lug portion (22).

6. The battery of claim 5, wherein the second segment (42) is of unitary construction with the first segment (41).

7. The battery according to claim 6, wherein the first segment (41) extends from one end of the first insulating film (30) to the other end of the first insulating film (30) in a longitudinal direction of the cell main body (21).

8. The battery according to claim 6, wherein the second segment (42) also covers a surface of the cell main body (21) that is not covered by the first insulating film (30) and the first segment (41).

9. The battery of claim 8, wherein the cell body (21) comprises two first surfaces (211) arranged oppositely and four second surfaces (212) arranged around the first surfaces (211), and the area of the first surfaces (211) is larger than that of the second surfaces (212);

wherein the first insulating film (30), the first segment (41), and the second segment (42) cover the same first surface (211).

10. The battery according to claim 9, further comprising a third insulating film (50), wherein the third insulating film (50) covers both one of the first surfaces (211) and two adjacent second surfaces (212).

11. The battery according to claim 10, wherein the first insulating film (30) covers a portion of the third insulating film (50), and the second insulating film (40) is bonded to a surface of the first insulating film (30) covering the first surface (211).

12. The battery according to any one of claims 1 to 11, wherein the second insulating film (40) is provided with a glue layer, and the second insulating film (40) is provided in adhesion with the first insulating film (30).

13. The battery according to claim 12, wherein the first insulating film (30) is not provided with a glue layer.

14. The battery according to any one of claims 1 to 11, wherein the width of the second insulating film (40) is greater than the width of the tab portion (22), and the width of the second insulating film (40) is smaller than the width of the cell main body (21).

15. The battery according to any one of claims 1 to 11, wherein the number of the lug portions (22) is two, and the two lug portions (22) extend from two opposite sides of the cell main body (21);

wherein the second insulating film (40) extends from one of the lug parts (22) to the other of the lug parts (22).

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