CN218919245U

CN218919245U - Insulating sheet and battery

Info

Publication number: CN218919245U
Application number: CN202223154518.XU
Authority: CN
Inventors: 张俊川; 魏恒谦; 李文成
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-04-25
Anticipated expiration: 2032-11-25

Abstract

The utility model provides an insulating sheet and a battery. The first insulating sheet comprises five first protection sheets which are integrally connected, and the first protection sheets are suitable for wrapping the five surfaces of the battery core respectively to form a structure with an opening at the top; and a joint area is arranged between the adjacent first protection sheets, and the thickness of the joint area is smaller than that of the first protection sheets. The thickness of the connecting area of the insulating sheet with the structure is smaller than that of the first protective sheet, so that the first insulating sheet can be folded along the connecting area, and the wrapping efficiency of the battery cell is improved; and the edge of the battery core can be insulated and protected through the connection area.

Description

Insulating sheet and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to an insulating sheet and a battery.

Background

The existing battery assembly mode is that a plurality of battery cells are attached to form a battery cell group, and then the battery cell group is placed in a battery shell to form a high-capacity battery. In order to avoid corrosion of the shell, the shell of the current battery cell is usually positively charged, and in order to prevent short circuit between the shell and the negative electrode, the battery cell needs to be insulated and protected; the higher the number of battery cell strings in the battery pack or the module, the higher the loop voltage, and the higher the insulation protection requirement on the electrode group inside the battery cells.

The existing square battery cell structure is insulated through an insulating sheet, and the insulating sheet wraps two large faces, two side faces and the bottom face of the square battery cell. The insulating sheet expansion state comprises five faces of a cuboid expansion chart, the five faces of the insulating sheet are folded along each edge of the battery cell to wrap the battery cell, the thickness of each face of the insulating sheet is the same, the insulating sheet is inconvenient to fold, and the wrapping efficiency of the battery cell is low.

Disclosure of Invention

Therefore, the utility model aims to overcome the defect of inconvenient folding caused by the fact that the thickness of each surface of the insulating sheet is the same in the prior art.

To this end, the utility model provides an insulating sheet comprising

The first insulating sheet comprises five first protection sheets which are integrally connected, two adjacent first protection sheets can be mutually folded, and the first protection sheets are suitable for wrapping five surfaces of the battery cell respectively to form a structure with an opening at the top;

and a joint area is arranged between the adjacent first protection sheets, and the thickness of the joint area is smaller than that of the first protection sheets.

Optionally, the width of the joint area of the insulating sheet is 0.02mm-41mm; and/or the land thickness is 5 μm to 200 μm.

Optionally, in the insulating sheet, the first protection sheet is provided with a superposition portion.

Optionally, the insulating sheet further comprises a second insulating sheet, the second insulating sheet wraps and is connected to the outside of four corners of the bottom of the first insulating sheet, and when the second insulating sheet is in a folded state, the second insulating sheet has three sealed wrapping surfaces.

Optionally, the second insulating sheet is in a right triangular pyramid shape.

Optionally, the above-mentioned insulating sheet, the second insulating sheet includes two second protection sheets and two third protection sheets, two adjacent side edges of second protection sheets are connected integrally, two third protection sheets are connected integrally respectively in two same side edges of second protection sheets, two adjacent sides of third protection sheets overlap in order to enclose into confined parcel face with two second protection sheets, can fold between two second protection sheets, and second protection sheet and third protection sheet junction can fold.

Optionally, in the insulating sheet, the second protection sheet is rectangular, and the third protection sheet is triangular; and/or the third protective sheet is trapezoid.

Optionally, in the insulating sheet, an angle of a joint of the third protection sheet and the second protection sheet is 45 ° -90 °.

Optionally, the materials of the first insulating sheet and the second insulating sheet are polypropylene; and/or

The second insulating sheet is adhered to the first insulating sheet.

The utility model provides a battery comprising the insulating sheet described in any one of the above.

The technical scheme of the utility model has the following advantages:

1. according to the insulating sheet provided by the utility model, the thickness of the joint area is smaller than that of the first protection sheet, so that the first insulating sheet can be folded along the joint area conveniently, and the wrapping efficiency of the battery cell is improved; and the edge of the battery core can be insulated and protected through the connection area.

2. According to the insulating sheet provided by the utility model, the five first protection sheets of the first insulating sheet are respectively wrapped outside the battery cells, and then the second insulating sheet is wrapped outside the four corners of the bottom of the first insulating sheet so as to cover the gaps at the four corners of the bottom of the first insulating sheet, thereby ensuring the insulating effect of the insulating sheet and meeting the protection requirement on the electrode group inside the battery cells under the condition of higher number of battery cell strings.

3. The overlapping part is arranged on the first insulating sheet so as to wrap the side edges and the bottom edges of the battery cell, ensure that the first insulating sheet completely wraps the four side surfaces of the battery cell, improve the wrapping property of the first insulating sheet and improve the insulating effect of the insulating sheet.

4. According to the battery provided by the utility model, the four sides, the bottom and the bottom four corners of the battery cell are completely wrapped by the insulating sheets, so that the insulating effect is good, the protection requirement on the electrode group inside the battery cell is met under the condition of higher number of battery cell strings, the short circuit or arc discharge condition between the shell and the negative electrode under high voltage is avoided, and the safety of the battery is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing a folded state of an insulating sheet according to embodiment 1 of the present utility model;

FIG. 2 is an expanded view of the first insulating sheet of FIG. 1;

fig. 3 is a schematic view of a second insulating sheet in the insulating sheets according to embodiment 1 of the present utility model;

fig. 4 is an expanded view of a first modified structure of a second insulating sheet among the insulating sheets provided in embodiment 1 of the present utility model;

fig. 5 is an expanded view of a second modified structure of a second insulating sheet among the insulating sheets provided in embodiment 1 of the present utility model.

Reference numerals illustrate:

1. a first insulating sheet; 11. a first protective sheet; 12. a junction region; 13. a superposition section; 2. a second insulating sheet; 21. a second protective sheet; 22. a third protective sheet; 23. a first edge; 24. a second side; 25. a third side; 3. a battery cell; 4. and an adhesive part.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying 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 thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

The present embodiment provides an insulating sheet, as shown in fig. 1 to 3, which includes a first insulating sheet 1, where the first insulating sheet 1 includes five first protection sheets 11 integrally connected, and two adjacent first protection sheets can be folded mutually, and the first protection sheets 11 are adapted to wrap five faces of the battery core 3 respectively to form a top opening structure; an engagement region 12 is provided between adjacent first protection sheets 11, and the thickness of the engagement region 12 is smaller than that of the first protection sheets 11.

The thickness of the connecting area 12 of the insulating sheet with the structure is smaller than that of the first protection sheet 11, so that the first insulating sheet 1 can be folded along the connecting area 12 conveniently, and the wrapping efficiency of the battery cell is improved; and the edge of the battery cell 3 can be insulated and protected through the joint area 12.

Preferably, the spacing between adjacent first protection sheets 11 is 0.02mm to 41mm, i.e., the width of the land area 12 is 0.02mm to 41mm, the thickness of the first protection sheets 11 is 10 μm to 500 μm, and the thickness of the land area 12 is 5 μm to 200 μm. In order to facilitate bending, a crease may be formed in advance on the transition edge of the first protection sheet 11 and the joining region 12.

The insulating sheet further comprises a second insulating sheet 2, the second insulating sheet 2 is wrapped and connected outside four corners of the bottom of the first insulating sheet 1, and when the second insulating sheet 2 is in a folded state, the second insulating sheet 2 is provided with three closed wrapping surfaces. After the first insulating sheet wraps the battery cell, gaps still exist on the insulating sheets at four corners of the bottom of the battery cell, and the insulating effect is affected. The insulating piece of this structure, the five first protection pieces 11 of first insulating piece 1 wrap up outside electric core 3 respectively earlier, wrap up second insulating piece 2 outside the bottom four corners of first insulating piece 1 again to cover the gap of first insulating piece 1 bottom four corners department, guarantee the insulating effect of insulating piece, satisfy the protection requirement to the inside utmost point group of electric core 3 under the higher circumstances of electric core 3 cluster number, avoid under the high pressure casing and negative pole short circuit or the condition of drawing the arc, promote the security of electric core 3.

Optionally, the battery cell is a square battery cell, and the five first protection sheets 11 wrap the five faces of the square battery cell respectively to form a square structure with an open top.

Referring to fig. 1 and 3, the second insulating sheet 2 has a rectangular triangular pyramid shape. The second insulating sheet 2 comprises three mutually perpendicular sealing wrapping surfaces, one side of the second insulating sheet 2 extending vertically is a first side 23 thereof, one side extending horizontally is a second side 24 thereof, and the lengths of the first side 23 and the second side 24 are preferably 10mm-30mm, so that four corners of the first insulating sheet 1 can be wrapped and materials can be saved.

Alternatively, the first insulating sheet 1 and the second insulating sheet 2 are made of polypropylene, and have excellent high-frequency insulating properties.

Alternatively, the second insulating sheet 2 is adhered to the first insulating sheet 1, and the first insulating sheet 1 is easily connected to the second insulating sheet 2. For example, an adhesive portion 4 is provided on the inner side of each wrapping surface of the second insulating sheet 2, for example, the adhesive portion is a non-adhesive layer, and the second insulating sheet 2 is adhered to the first insulating sheet 1 by non-adhesive. The first insulating sheet 1 and the second insulating sheet 2 may also be connected by heat fusion.

Referring to fig. 2, the first protection sheets 11 are provided with overlapping portions 13, overlapping areas of the two first protection sheets 11 which are not integrally connected with the first insulation sheets 1 are wrapped through the overlapping portions 13 so as to wrap side edges and bottom edges of the battery cells 3, the first insulation sheets 1 are guaranteed to wrap four side faces of the battery cells 3 completely, the wrapping performance of the first insulation sheets 1 is improved, and the insulation effect of the insulation sheets is improved.

Referring to fig. 2, the developed view of the five first protective sheets 11 is a developed view of five faces of a rectangular parallelepiped, and the five first protective sheets 11 include two large side faces, two small side faces, and one bottom face. The two large side surfaces and the bottom surface of the first insulating sheet 1 are arranged in the same row, the two small side surfaces are arranged at the upper end and the lower end of the right large side surface, the long sides of the two small side surfaces are connected with large overlapping parts through the connecting areas 12, the wide sides of the two small side surfaces close to the bottom surface are connected with small overlapping parts through the connecting areas 12, for example, the large overlapping parts and the small overlapping parts are rectangular, the length of the large overlapping parts is identical to that of the small side surfaces, the length of the small overlapping parts is identical to that of the small side surfaces, after the small overlapping parts are folded, the large overlapping parts wrap the overlapping areas between the small side surfaces and the large side surfaces, and the small overlapping parts wrap the overlapping areas between the small side surfaces and the bottom surfaces.

Alternatively, the joining region 12 may be integrally formed on the first protective sheet 11 or formed by stamping, and the joining region 12 may be made of soft material such as adhesive tape, and the adjacent first protective sheets 11 are connected by adhesive tape.

Example 2

The present embodiment provides an insulating sheet, see fig. 4, which is different from embodiment 1 in that the second insulating sheet 2 includes two second protection sheets 21 and two third protection sheets 22, adjacent sides of the two second protection sheets 21 are integrally connected, the two third protection sheets 22 are integrally connected to same side sides of the two second protection sheets 21, adjacent sides of the two third protection sheets 22 overlap to enclose three enclosed wrapping surfaces with the two second protection sheets 21, the two second protection sheets 21 are foldable, and a junction between the second protection sheets 21 and the third protection sheets 22 is foldable. For example, after folding, two second protection sheets 21 are respectively located on two adjacent large and small sides of the first insulating sheet 1, and two third protection sheets 22 are located on the bottom surface of the first insulating sheet 1.

Optionally, the third protective sheet 22 is triangular. The angle of the corner where the third protective sheet 22 is connected with the second protective sheet 21 is 45 ° -90 °, which ensures that the adjacent sides of the two third protective sheets 22 overlap, preferably, the angle of the corner where the third protective sheet 22 is connected with the second protective sheet 21 is 45 ° -60 °, which ensures that the adjacent sides of the two third protective sheets 22 overlap and the overlapping area is small, which is advantageous for reducing the overall thickness of the insulating sheet and saving materials. The adjacent side of the two third protection sheets 22 is a third side 25, the length of which is preferably 7-22mm. The second protective sheet 21 may have a rectangular shape, a right triangle shape, or the like.

Each of the second and third

protective sheets

21 and 22 is provided with a non-adhesive layer on an inner side wall thereof to conveniently and rapidly connect the second insulating sheet 2 to the first insulating sheet 1.

As a modification, referring to fig. 5, the third protection sheet 22 may also have a trapezoid shape, and two third protection sheets 22 may also have a triangle shape, one trapezoid shape.

Example 3

This embodiment provides a battery including the insulating sheet, the battery cell 3, and the case in embodiment 1 or embodiment 2. The insulating sheet is wrapped outside the battery cell 3, and then the battery cell 3 is placed in the shell. The thickness of the joint area 12 of the first insulating sheet 1 is smaller than that of the first protective sheet 11, so that the first insulating sheet 1 can be folded along the joint area 12 conveniently, and the wrapping efficiency of the battery cell is improved; and the edge of the battery cell 3 can be insulated and protected through the joint area 12.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. An insulating sheet, characterized by comprising:

the first insulating sheet (1) comprises five first protection sheets (11) which are integrally connected, wherein two adjacent first protection sheets (11) can be mutually folded, and the first protection sheets (11) are suitable for wrapping five surfaces of the battery cell (3) respectively to form a structure with an open top;

and a joint area (12) is arranged between the adjacent first protection sheets (11), and the thickness of the joint area (12) is smaller than that of the first protection sheets (11).

2. The insulating sheet of claim 1, wherein the land width is 0.02mm to 41mm; and/or the land thickness is 5 μm to 200 μm.

3. Insulating sheet according to claim 1 or 2, characterized in that the first protective sheet (11) is provided with a coinciding space (13).

4. The insulating sheet according to claim 1 or 2, further comprising a second insulating sheet (2), wherein the second insulating sheet (2) is wrapped around and connected to the outside of the bottom four corners of the first insulating sheet (1), and wherein the second insulating sheet (2) has three enclosed wrapping surfaces when the second insulating sheet (2) is in a folded state.

5. Insulating sheet according to claim 4, characterized in that the second insulating sheet (2) has a right triangular pyramid shape.

6. The insulating sheet according to claim 4, wherein the second insulating sheet (2) comprises two second protective sheets (21) and two third protective sheets (22), adjacent sides of the two second protective sheets (21) are integrally connected, the two third protective sheets (22) are integrally connected to same side sides of the two second protective sheets (21), adjacent sides of the two third protective sheets (22) overlap to form a closed wrapping surface with the two second protective sheets (21), a joint between the two second protective sheets (21) and the third protective sheets (22) can be folded.

7. The insulating sheet according to claim 6, characterized in that the second protective sheet (21) is rectangular and the third protective sheet (22) is triangular; and/or the third protective sheet (22) has a trapezoid shape.

8. Insulating sheet according to claim 7, characterized in that the angle of the connection of the third protective sheet (22) to the second protective sheet (21) is 45 ° -90 °.

9. The insulating sheet according to claim 4, wherein the first insulating sheet (1) and the second insulating sheet (2) are both made of polypropylene; and/or

The second insulating sheet (2) is adhered to the first insulating sheet (1).

10. A battery comprising the insulating sheet according to any one of claims 1 to 9.