CN218896781U - Bare cell insulating sheet and battery thereof - Google Patents

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 insulation sheet and its battery

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 technique

At present, prismatic lithium-ion batteries usually use adhesive tape or pp Mylar film to isolate the shell and bare cells, but the bottom of the coated cells needs to add a bottom plate, which has two functions: (1) Further isolate the bare cell from the bottom of the shell to play an insulating role; (2) make the electrolyte soak into the bottom of the cell to improve the wettability of the pole piece. However, the bottom plate will take up more internal space, reduce the assembly ratio, and reduce the amount of electrolyte in the battery.

Utility model content

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

The utility model also aims to propose a battery to apply the above-mentioned insulating sheet of the bare cell.

The insulating sheet for the bare electric core according to the embodiment of the present invention includes: an insulating sheet body, the insulating sheet body is used to cover the bare electric core, and the insulating sheet body has a bottom corresponding to the bare electric core. The bottom end surface of the bottom end surface is provided with a supporting convex part and an electrolyte solution inlet and outlet hole.

According to the bare cell insulating sheet of the embodiment of the utility model, by setting the supporting convex part and the electrolyte inlet and outlet holes on the bottom end surface, the supporting convex part can replace the bottom supporting plate, and the electrolyte inlet and outlet can allow more electrolyte to enter In the battery, the cost can be reduced, more space inside the battery can be released, more electrolyte can be injected, the wettability of the pole piece is better, and the purpose of improving the cycle life of the battery is achieved.

In some embodiments, there are at least three support protrusions, and the line connecting two adjacent support protrusions among the at least three support protrusions is the same as the other two adjacent support protrusions. Departmental connections intersect.

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 the other part is disposed at the other end of the insulating sheet body in the longitudinal direction.

In some embodiments, there are one or more supporting protrusions at both ends of the lengthwise direction of the insulating sheet body, and when there are multiple supporting protrusions, the plurality of supporting protrusions are arranged along the length of the insulating sheet. The width direction of the main body is arranged at intervals.

In some embodiments, the electrolyte inlet and outlet holes are provided in multiple rows, and there are at least two electrolyte inlet and outlet holes in each row.

In some embodiments, multiple rows of electrolyte inlet and outlet holes are arranged at intervals along the length direction of the insulating sheet body, and at least two electrolyte inlet and outlet holes in each row are arranged at intervals along the width direction of the insulating sheet body .

In some embodiments, multiple rows of the electrolyte inlet and outlet holes are arranged at intervals along the width direction of the insulating sheet body, and at least two electrolyte inlet and outlet holes in each row are arranged at intervals along the length direction of the insulating sheet body .

In some embodiments, multiple rows of the electrolyte inlet and outlet holes are arranged at intervals along the length direction of the insulating sheet body, and at least two electrolyte inlet and outlet holes in each row are arranged at intervals along the first direction, and the first The included angle between the direction and the length direction of the insulation sheet body is less than 90 degrees.

In some embodiments, the height of the supporting convex part is 0.2mm-0.5mm.

The battery according to the embodiment of the present invention includes: a bare cell; the above-mentioned bare cell insulating sheet, the body of the insulating sheet is coated on the bare cell; a casing, the bare cell and the bare cell The cell insulating sheet is arranged in the casing, and the supporting protrusion stops against the bottom of the casing. Thus, the cycle life of the battery is improved.

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

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the structural representation of bare electric core insulating sheet in the embodiment of the present utility model;

Fig. 2 is a structural schematic diagram of a bare cell insulation sheet in yet another embodiment of the utility model;

Fig. 3 is a structural schematic diagram of a bare cell insulating sheet in another embodiment of the present invention;

Fig. 4 is a schematic diagram of another angle of the insulating sheet of the bare cell in the embodiment of the present invention.

Reference signs:

100. Bare cell insulation sheet;

10. Insulation sheet body; 101. Bottom surface; 1011. Support convex part; 1012. Electrolyte solution inlet and outlet holes.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In describing the present invention, it should be understood that the terms "centre", "length", "upper", "lower", "front", "rear", "left", "right", "vertical" , "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description , rather than 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 utility model.

In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features, which are used to describe the features differently, without order or importance.

In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Referring to Fig. 1-Fig. 4, the bare cell insulation sheet 100 according to the embodiment of the present utility model will be described below.

As shown in FIG. 1 , the bare cell insulating sheet 100 according to the embodiment of the present invention includes: an insulating sheet body 10 .

The insulating sheet body 10 is used to cover the bare cell, and the insulating sheet body 10 has a bottom end surface 101 corresponding to the bottom of the bare cell.

It can be understood that the insulating sheet body 10 has insulating properties, and it can be folded to form a three-dimensional structure with a mounting cavity, and the bare cell is placed in the mounting cavity, so that the bare cell and the outer shell are insulated from each other. The outer bottom end surface 101 of the three-dimensional structure formed by the insulating sheet body 10 is equipped with a supporting convex part 1011, which is used to replace the bottom support plate in the prior art and increase the space in the battery pack. The liquid inlet and outlet holes 1012 allow the electrolyte to enter the battery cell through the electrolyte solution inlet and outlet hole 1012, thereby infiltrating the battery cell and improving the cycle life of the battery. It should be noted that the material of the insulating sheet body 10 is not particularly limited, and those skilled in the art can select according to needs, for example, it can be made of PP. At the same time, the specific shape of the supporting convex portion 1011 is not particularly limited, for example, it can be a cylinder, and the area of the supporting convex portion 1011 is obviously smaller than the area of the bottom end surface 101, and those skilled in the art can select a specific area according to actual needs.

According to the bare cell insulating sheet 100 of the embodiment of the utility model, by setting the supporting convex part 1011 and the electrolyte solution inlet and outlet hole 1012 on the bottom end surface 101, the supporting convex part 1011 can replace the bottom supporting plate, and the electrolyte solution inlet and outlet can make more More electrolyte enters the battery, which can reduce the cost, release more space inside the battery, inject more electrolyte, make the wettability of the pole piece better, and achieve the purpose of improving the battery cycle life.

In some embodiments, referring to FIG. 1 , there are at least three supporting protrusions 1011 , and the line connecting two adjacent supporting protrusions 1011 among the at least three supporting protrusions 1011 is connected to the other adjacent two supporting protrusions. The connection of 1011 intersects. It can be understood that, through the above arrangement, it is ensured that the supporting convex portion 1011 can relatively stably support the battery cell. It should be noted that the specific number of the supporting protrusions 1011 may be greater than or equal to three, for example, it may be three, four or six.

In some embodiments, referring to FIG. 1 , some of the at least three supporting protrusions 1011 are set at one end of the length direction of the insulating sheet body 10, and the other part is set at the other end of the length direction of the insulating sheet body 10, so that the supporting protrusions 1011 supports the battery better. Specifically, referring to FIG. 1 , there are two groups of supporting protrusions 1011 , one group of supporting protrusions 1011 on the left side and one group of supporting protrusions 1011 on the right side. It should be noted that the length direction is the left-right direction in FIG. 1 .

In some embodiments, referring to FIG. 1 , there are one or more supporting protrusions 1011 at both ends of the length direction of the insulating sheet body 10 , and when there are multiple supporting protrusions 1011 , the plurality of supporting protrusions 1011 along the insulating sheet body 10 The width direction of the battery is set at intervals, so that the installation stability of the battery cell is increased. Specifically, two groups of supporting protrusions 1011 can be formed in the left and right directions, the left group has two supporting protrusions 1011 spaced along the front and rear direction, and the right group has two supporting protrusions 1011 spaced along the front and rear direction. Convex part 1011. It should be noted that the width direction is the front-back direction in FIG. 2 .

In some embodiments, referring to FIG. 1 , there are multiple rows of electrolyte inlet and outlet holes 1012 , and each row of electrolyte inlet and outlet holes 1012 is at least two, so that the electrolyte can infiltrate the battery cell more efficiently and improve the cycle life of the battery.

In some embodiments, referring to FIG. 1 , multiple rows of electrolyte inlet and outlet holes 1012 are arranged at intervals along the length direction of the insulating sheet body 10 , and at least two electrolyte inlet and outlet holes 1012 in each row are arranged at intervals along the width direction of the insulating sheet body 10 , so that the inside of the bare cell is always infiltrated with electrolyte, improving the cycle life of the battery. It should be noted that the “length direction” refers to the left-right direction in FIG. 1 , and the “width direction” refers to the front-rear direction in FIG. 1 .

In some embodiments, referring to FIG. 2 , multiple rows of electrolyte inlet and outlet holes 1012 are arranged at intervals along the width direction of the insulating sheet body 10 , and at least two electrolyte inlet and outlet holes 1012 of each row are arranged at intervals along the length direction of the insulating sheet body 10 , so that the inside of the bare cell is always infiltrated with electrolyte, improving the cycle life of the battery. It should be noted that the “width direction” refers to the front-rear 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 arranged at intervals along the length direction of the insulating sheet body 10, and at least two electrolyte inlet and outlet holes 1012 in each row are arranged at intervals along the first direction, and the first direction The included angle with the length direction of the insulating sheet body 10 is less than 90 degrees, so that the inside of the bare cell is always infiltrated with the electrolyte, 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 and outlet holes 1012 is formed in FIG. 3 .

In some embodiments, referring to FIG. 4 , the height of the supporting protrusion 1011 is 0.2 mm˜0.5 mm. It should be noted that the height of the supporting convex portion 1011 can be any value from 0.2mm to 0.5mm, for example, it can be 0.2mm, 0.3mm or 0.5mm.

The battery according to the embodiment of the present invention includes: a bare cell and the above-mentioned bare cell insulating sheet 100, the insulating sheet body 10 is coated on the bare cell; the shell, the bare cell and the bare cell insulating sheet 100 are set Inside the housing, the supporting protrusion 1011 abuts against the bottom of the housing. Thus, the cycle life of the battery is improved.

A specific embodiment of the bare cell insulation sheet 100 of the present invention will be described below with reference to the accompanying drawings.

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

The insulating sheet body 10 is used to cover the bare cell, and the insulating sheet body 10 has a bottom end surface 101 corresponding to the bottom of the bare cell.

There are four supporting protrusions 1011 , and the line connecting two adjacent supporting protrusions 1011 among the four supporting protrusions 1011 intersects the connection between the other two adjacent supporting protrusions 1011 . The four supporting protrusions 1011 form two groups, and the two groups of supporting protrusions 1011 are arranged at intervals along the length direction of the insulating sheet body 10 . There are two supporting protrusions 1011 , and the two supporting protrusions 1011 are spaced apart along the width direction of the insulating sheet body 10 .

There are twelve rows of electrolyte inlet and outlet holes 1012, and each row has seven electrolyte inlet and outlet holes 1012. Twelve rows of electrolyte inlet and outlet holes 1012 are arranged at intervals along the length direction of the insulating sheet body 10 , and seven electrolyte inlet and outlet holes 1012 in each row are arranged at intervals along the width direction of the insulating sheet body 10 . The height of the supporting convex portion 1011 was 0.3 mm.

The battery according to the embodiment of the present invention includes: a bare cell, a bare cell insulating sheet 100 and a casing, the insulating sheet body 10 is coated on the bare cell; the bare cell and the bare cell insulating sheet 100 are arranged on the casing Inside, the supporting protrusion 1011 stops against the bottom of the housing.

In the description of this specification, descriptions with reference to the terms "some embodiments", "optionally", "further" or "some examples" mean that specific features, structures, materials or Features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

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.

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