CN218896781U

CN218896781U - Bare cell insulating sheet and battery thereof

Info

Publication number: CN218896781U
Application number: CN202223376299.XU
Authority: CN
Inventors: 张兴; 苏家磊
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-04-21
Anticipated expiration: 2032-12-15

Abstract

The utility model discloses a bare cell insulating sheet and a battery thereof, wherein the bare cell insulating sheet comprises: the insulating sheet body is used for being coated on the bare cell, and the insulating sheet body is provided with a bottom end face corresponding to the bottom of the bare cell, and the bottom end face is provided with a supporting convex part and an electrolyte inlet and outlet hole. The bare cell insulating sheet can cancel the bottom support plate structural member, realize the purpose of reducing cost, release more space inside the battery, and inject more electrolyte, so that the wettability of the electrode sheet is better, thereby achieving the purpose of prolonging the cycle life of the battery.

Description

Bare cell insulating sheet and battery thereof

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a bare cell insulating sheet and a battery thereof.

Background

At present, a Mylar film made of an adhesive tape or pp material is generally adopted for isolating a shell and a bare cell, but a layer of bottom supporting plate is required to be added at the bottom of the coated cell, and the functions of the bottom supporting plate are as follows: (1) The bare cell is further isolated from the bottom of the shell, so that an insulating effect is achieved; (2) Electrolyte is infiltrated to the bottom of the battery cell, so that the wettability of the pole piece is improved. But the bottom plate occupies more internal space, reduces the assembly ratio, and reduces the amount of electrolyte in the battery.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an objective of the present utility model is to provide a bare cell insulating sheet, so as to solve the problem that the bottom plate occupies too much space in the battery and reduces the amount of electrolyte in the battery in the prior art.

The utility model also aims to provide a battery for applying the bare cell insulating sheet.

According to an embodiment of the utility model, a bare cell insulating sheet includes: the insulating sheet body is used for being coated on the bare cell, and the insulating sheet body is provided with a bottom end face corresponding to the bottom of the bare cell, and the bottom end face is provided with a supporting convex part and an electrolyte inlet and outlet hole.

According to the bare cell insulating sheet provided by the embodiment of the utility model, the supporting convex part and the electrolyte inlet and outlet holes are formed on the bottom end surface, the supporting convex part can replace the bottom supporting plate, and more electrolyte can enter the battery through the electrolyte inlet and outlet, so that the cost can be reduced, more space in the battery can be released, more electrolyte is injected, the wettability of the pole piece is better, and the purpose of prolonging the cycle life of the battery is achieved.

In some embodiments, the number of the support protrusions is at least three, and a connecting line of two adjacent support protrusions in the at least three support protrusions intersects with a connecting line of two adjacent support protrusions.

In some embodiments, at least three of the supporting protrusions are partially disposed at one end of the insulating sheet body in the longitudinal direction, and another portion is disposed at the other end of the insulating sheet body in the longitudinal direction.

In some embodiments, when the number of the supporting protrusions is one or more at both ends in the longitudinal direction of the insulating sheet body, and the number of the supporting protrusions is plural, the plurality of the supporting protrusions are disposed at intervals in the width direction of the insulating sheet body.

In some embodiments, the electrolyte inlet and outlet holes are provided with a plurality of rows, and each row of electrolyte inlet and outlet holes is at least two.

In some embodiments, a plurality of rows of the electrolyte access holes are spaced apart along a length direction of the insulating sheet body, and at least two of the electrolyte access holes of each row are spaced apart along a width direction of the insulating sheet body.

In some embodiments, the plurality of rows of the electrolyte access holes are spaced apart along a width direction of the insulating sheet body, and at least two of the electrolyte access holes of each row are spaced apart along a length direction of the insulating sheet body.

In some embodiments, the plurality of rows of electrolyte inlet and outlet holes are spaced apart along the length direction of the insulating sheet body, and at least two electrolyte inlet and outlet holes of each row are spaced apart along a first direction, and an included angle between the first direction and the length direction of the insulating sheet body is smaller than 90 degrees.

In some embodiments, the height of the support protrusions is 0.2mm to 0.5mm.

A battery according to an embodiment of the present utility model includes: a bare cell; the bare cell insulating sheet comprises a bare cell body, wherein the bare cell body is coated with the bare cell; the bare cell and the bare cell insulating sheet are arranged in the shell, and the supporting convex part is stopped on the bottom of the shell. Thereby, the cycle life of the battery is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a bare cell insulating sheet according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a bare cell insulating sheet according to another embodiment of the present utility model;

FIG. 3 is a schematic view of a bare cell insulating sheet according to another embodiment of the present utility model;

fig. 4 is a schematic view of another angle of the bare cell insulating sheet in an embodiment of the utility model.

Reference numerals:

100. bare cell insulating sheet;

10. an insulating sheet body; 101. a bottom end surface; 1011. a support protrusion; 1012. electrolyte inlet and outlet holes.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

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

Referring now to fig. 1-4, a bare cell insulating sheet 100 according to an embodiment of the present utility model is described.

As shown in fig. 1, a bare cell insulating sheet 100 according to an embodiment of the present utility model includes: an insulating sheet body 10.

The insulating sheet body 10 is used for wrapping the bare cell, and the insulating sheet body 10 is provided with a bottom end face 101 corresponding to the bottom of the bare cell, and the bottom end face 101 is provided with a supporting convex portion 1011 and an electrolyte inlet and outlet 1012.

It will be appreciated that the insulative sheet body 10 has insulative properties that can be folded to form a three-dimensional structure having a mounting cavity within which the bare cell is disposed such that the bare cell and the housing are insulated from one another. The support convex portion 1011 is arranged on the outer bottom end face 101 of the three-dimensional structure formed by the insulating sheet body 10 and used for replacing a bottom supporting plate in the prior art, so that the space in the battery pack is enlarged, and meanwhile, the electrolyte inlet and outlet holes 1012 are further formed in the bottom end face 101, so that electrolyte enters the battery cell through the electrolyte inlet and outlet holes 1012, the battery cell is soaked, and the cycle life of the battery is prolonged. The material of the insulating sheet body 10 is not particularly limited, and one skilled in the art may select it as necessary, and for example, it may be PP. Meanwhile, the specific shape of the supporting protrusion 1011 is not particularly limited, and for example, may be a cylinder, and the area of the supporting protrusion 1011 is significantly smaller than the area of the bottom end face 101, and a specific area may be selected according to actual needs by those skilled in the art.

According to the bare cell insulating sheet 100 provided by the embodiment of the utility model, the bottom end surface 101 is provided with the supporting convex part 1011 and the electrolyte inlet and outlet hole 1012, the supporting convex part 1011 can replace the bottom plate, and more electrolyte can enter the battery through the electrolyte inlet and outlet, so that the cost can be reduced, more space in the battery can be released, more electrolyte is injected, the wettability of the pole piece is better, and the purpose of prolonging the cycle life of the battery is achieved.

In some embodiments, referring to fig. 1, the number of support protrusions 1011 is at least three, and the line connecting two adjacent support protrusions 1011 of the at least three support protrusions 1011 intersects with the line connecting two adjacent support protrusions 1011. It can be understood that, through the above arrangement, the supporting protrusions 1011 are ensured to support the battery cell relatively firmly. The specific number of the support protrusions 1011 may be three or more, and may be three, four, six, or the like, for example.

In some embodiments, referring to fig. 1, at least three supporting protrusions 1011 are partially provided at one end of the insulating sheet body 10 in the length direction, and another portion is provided at the other end of the insulating sheet body 10 in the length direction, so that the supporting protrusions 1011 better support the battery cells. Specifically, referring to fig. 1, the support protrusions 1011 are formed in two groups, with one group of support protrusions 1011 on the left side and one group of support protrusions 1011 on the right side. The longitudinal direction is the left-right direction in fig. 1.

In some embodiments, referring to fig. 1, when the number of the supporting protrusions 1011 at both ends in the length direction of the insulative sheet body 10 is one or more and the number of the supporting protrusions 1011 is plural, the plurality of supporting protrusions 1011 are disposed at intervals in the width direction of the insulative sheet body 10, thereby increasing the mounting stability of the battery cell. Specifically, two sets of support protrusions 1011 may be formed in the left-right direction, one set on the left having two support protrusions 1011 disposed at intervals in the front-rear direction, and one set on the right having two support protrusions 1011 disposed at intervals in the front-rear direction. The width direction is the front-back direction in fig. 2.

In some embodiments, referring to fig. 1, the electrolyte access holes 1012 are provided with multiple rows, and each row of electrolyte access holes 1012 is at least two, so that the electrolyte can infiltrate the battery cell more efficiently, and the cycle life of the battery is prolonged.

In some embodiments, referring to fig. 1, multiple rows of electrolyte inlet and outlet holes 1012 are spaced apart along the length direction of the insulating sheet body 10, and at least two electrolyte inlet and outlet holes 1012 of each row are spaced apart along the width direction of the insulating sheet body 10, so that the inside of the bare cell is always soaked by electrolyte, and the cycle life of the battery is improved. The "longitudinal direction" is the left-right direction in fig. 1, and the "width direction" is the front-back direction in fig. 1.

In some embodiments, referring to fig. 2, multiple rows of electrolyte inlet and outlet holes 1012 are spaced apart along the width direction of the insulating sheet body 10, and at least two electrolyte inlet and outlet holes 1012 of each row are spaced apart along the length direction of the insulating sheet body 10, so that the inside of the bare cell is always soaked by electrolyte, and the cycle life of the battery is improved. The "width direction" refers to the front-back direction in fig. 2, and the "length direction" refers to the left-right direction in fig. 2.

In some embodiments, referring to fig. 3, multiple rows of electrolyte inlet and outlet holes 1012 are spaced apart along the length direction of the insulating sheet body 10, at least two electrolyte inlet and outlet holes 1012 of each row are spaced apart along the first direction, and an included angle between the first direction and the length direction of the insulating sheet body 10 is smaller than 90 degrees, so that electrolyte is infiltrated into the bare cell all the time, and the cycle life of the battery is improved. It should be noted that, the "longitudinal direction" refers to the left-right direction in fig. 3, and the "first direction" refers to the direction in which each row of electrolyte inlet/outlet holes 1012 is formed in fig. 3.

In some embodiments, referring to fig. 4, the height of the support protrusions 1011 is 0.2mm to 0.5mm. The height of the supporting projection 1011 may be any value from 0.2mm to 0.5mm, and may be, for example, 0.2mm, 0.3mm, or 0.5mm.

A battery according to an embodiment of the present utility model includes: the bare cell and the bare cell insulating sheet 100 are arranged in a way that the insulating sheet body 10 is coated on the bare cell; the housing, the bare cell and the bare cell insulating sheet 100 are provided in the housing, and the supporting boss 1011 is stopped on the bottom of the housing. Thereby, the cycle life of the battery is improved.

One embodiment of the bare cell insulating sheet 100 of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1, the bare cell insulating sheet 100 includes: an insulating sheet body 10.

The number of the support protrusions 1011 is four, and the connection line of two adjacent support protrusions 1011 of the four support protrusions 1011 intersects with the connection line of two adjacent support protrusions 1011. The four supporting protrusions 1011 form two groups, and the two groups of supporting protrusions 1011 are disposed at intervals along the length direction of the insulating sheet body 10. The number of the supporting protrusions 1011 is two, and the two supporting protrusions 1011 are provided at intervals in the width direction of the insulating sheet body 10.

Twelve rows of electrolyte inlet holes 1012 are arranged, and each row of electrolyte inlet holes 1012 is seven. Twelve rows of electrolyte access holes 1012 are spaced apart along the length direction of the insulating sheet body 10, and seven electrolyte access holes 1012 of each row are spaced apart along the width direction of the insulating sheet body 10. The height of the supporting boss 1011 is 0.3mm.

A battery according to an embodiment of the present utility model includes: the bare cell, the bare cell insulation sheet 100 and the shell, wherein the insulation sheet body 10 is coated on the bare cell; the bare cell and the bare cell insulating sheet 100 are provided in the case, and the supporting boss 1011 abuts on the bottom of the case.

In the description of the present specification, reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A bare cell insulating sheet, comprising:

the insulating sheet body (10), insulating sheet body (10) are used for cladding on naked electric core, just insulating sheet body (10) have corresponding bottom terminal surface (101) that the bottom of naked electric core set up, be equipped with on bottom terminal surface (101) and support convex part (1011) and electrolyte business turn over hole (1012).

2. The bare cell insulating sheet according to claim 1, wherein the number of the supporting protrusions (1011) is at least three, and a connecting line of two adjacent supporting protrusions (1011) of the at least three supporting protrusions (1011) intersects with a connecting line of two adjacent supporting protrusions (1011).

3. The bare cell insulating sheet according to claim 2, wherein at least three of the supporting projections (1011) are provided partially at one end in the longitudinal direction of the insulating sheet body (10) and the other portion is provided at the other end in the longitudinal direction of the insulating sheet body (10).

4. A bare cell insulating sheet according to claim 3, wherein the insulating sheet body (10) has one or more support protrusions (1011) at both ends in the longitudinal direction, and when the support protrusions (1011) are plural, the plurality of support protrusions (1011) are arranged at intervals in the width direction of the insulating sheet body (10).

5. The bare cell insulating sheet according to claim 1, wherein the electrolyte access holes (1012) are provided in a plurality of rows, each row of the electrolyte access holes (1012) being at least two.

6. The bare cell insulating sheet according to claim 5, wherein a plurality of rows of the electrolyte access holes (1012) are arranged at intervals along the length direction of the insulating sheet body (10), and at least two of the electrolyte access holes (1012) of each row are arranged at intervals along the width direction of the insulating sheet body (10).

7. The bare cell insulating sheet according to claim 5, wherein a plurality of rows of the electrolyte access holes (1012) are arranged at intervals in a width direction of the insulating sheet body (10), and at least two of the electrolyte access holes (1012) of each row are arranged at intervals in a length direction of the insulating sheet body (10).

8. The bare cell insulating sheet according to claim 5, wherein a plurality of rows of the electrolyte access holes (1012) are arranged at intervals along the length direction of the insulating sheet body (10), at least two of the electrolyte access holes (1012) of each row are arranged at intervals along a first direction, and an angle between the first direction and the length direction of the insulating sheet body (10) is smaller than 90 degrees.

9. The bare cell insulating sheet according to claim 1, wherein the height of the supporting protrusion (1011) is 0.2mm to 0.5mm.

10. A battery, comprising:

a bare cell;

the bare cell insulating sheet according to any one of claims 1-9, the insulating sheet body (10) being coated on the bare cell;

the bare cell and the bare cell insulating sheet are arranged in the shell, and the supporting convex part (1011) is stopped on the bottom of the shell.