Insulating sheet and battery pole group

Abstract

The utility model discloses an insulating sheet and a battery pole group. Bending indentations are formed at the joints of two adjacent areas in a narrow-surface coating area, a large-surface coating area and an overlapping area; the extension lengths of the narrow surface coating area, the large surface coating area and the overlapping area along the length direction of the insulating sheet are L; wherein L = M-a1-a2-k1-b1-b2, or L = M-a1-k1-b1-a2-k2-b3, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover plate, a2 is the thickness of the negative electrode cover plate, k1 is the thickness of the positive electrode lower plastic, b1 is the distance from the insulating sheet to the positive electrode lower plastic, b2 is the distance from the insulating sheet to the negative electrode cover plate, and k2 is the thickness of the negative electrode lower plastic, b3 is the distance from the insulating sheet to the negative electrode lower plastic. According to the insulating sheet disclosed by the embodiment of the utility model, the insulating sheet can be conveniently attached to the naked battery cell, the attaching degree between the insulating sheet and the naked battery cell can be improved, the battery cell can be conveniently mounted in the shell, the use safety is improved, and the use effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to an insulating sheet and a battery pole group having the insulating sheet. Background Art

[0002] As lithium-ion battery technology matures, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, so the performance and safety requirements of lithium-ion batteries are also increasing. The bare cell insulation sheet of the blade battery is a key component in lithium-ion batteries. Its function is to protect the electrode group and avoid short circuits caused by overlapping the electrode group and the shell.

[0003] The existing bare blade battery cell insulating sheet is wrapped around the electrode group and then hot-fused to the positive and negative electrode plastic parts, and the overlapping areas are glued before being put into the shell. However, due to the long shell entry stroke of the blade cell, the width and length of the bare cell insulating sheet vary greatly, and it is very easy to be damaged or wrinkled, resulting in overlapping and short circuiting of the electrode group and the shell, causing safety problems. In addition, the tightness of the bare cell insulating sheet wrapping varies greatly, and the gap between the electrode group and the shell is of different sizes, which can easily cause the electrode group to move or make it difficult to enter the shell. There is room for improvement. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an insulating sheet, which has a high degree of fit with the bare battery core, facilitates the installation of the battery core into the housing, and improves the safety of use.

[0005] According to the insulating sheet of the embodiment of the utility model, the insulating sheet is used to cover the bare battery cell of the blade battery, and the insulating sheet includes a narrow surface covering area, a large surface covering area and an overlapping area connected along the width direction, and the large surface covering area and the overlapping area are two and respectively located on both sides of the narrow surface covering, and the connection between the two adjacent ones of the narrow surface covering area, the large surface covering area and the overlapping area is formed with a bending indentation, and the extension lengths of the narrow surface covering area, the large surface covering area and the overlapping area along the length direction of the insulating sheet are all L; wherein, it satisfies: L = M-a1-a2-k1- b1-b2, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover, a2 is the thickness of the negative electrode cover, k1 is the thickness of the plastic under the positive electrode, b1 is the distance from the insulating sheet to the plastic under the positive electrode, and b2 is the distance from the insulating sheet to the negative electrode cover; or satisfies: L=M-a1-k1-b1-a2-k2-b3, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover, k1 is the thickness of the plastic under the positive electrode, b1 is the distance from the insulating sheet to the plastic under the positive electrode, a2 is the thickness of the negative electrode cover, k2 is the thickness of the plastic under the negative electrode, and b3 is the distance from the insulating sheet to the plastic under the negative electrode.

[0006] According to the insulating sheet of the embodiment of the utility model, a narrow surface coating area, a large surface coating area and an overlapping area are provided, and bending indentations are provided, so that the insulating sheet can be attached to the bare battery cell, and the extension length L of the narrow surface coating area, the large surface coating area and the overlapping area along the length direction of the insulating sheet is set to satisfy: L = M-a1-a2-k1-b1-b2, or satisfy: L = M-a1-k1-b1-a2-k2-b3, which can improve the fit between the insulating sheet and the bare battery cell, facilitate the installation of the battery cell into the shell, and reduce the risk of damage and wrinkles of the insulating sheet, thereby improving the safety of use, achieving better use effect and a wider range of applications.

[0007] According to the insulating sheet of some embodiments of the utility model, the extension length of the large surface coating area along the width direction of the insulating sheet is A, and satisfies: A=e+d+h, wherein e is the width of the battery cell pole group, d is the thickness of the side plate of the bare battery cell, and h is the thickness of the insulating sheet.

[0008] According to the insulating sheet of some embodiments of the present invention, the extension length of the narrow surface coating area along the width direction of the insulating sheet is B, and satisfies: B=n+h, wherein n is the thickness of the battery cell electrode group, and h is the thickness of the insulating sheet.

[0009] According to the insulating sheet of some embodiments of the present invention, the extending length of the overlapping area along the width direction of the insulating sheet is C, and satisfies: C=(n / 2+1)~n+h.

[0010] According to the insulating sheet of some embodiments of the present invention, M, a1, a2 and k are quantitative values, and b1 and b2 are variable values.

[0011] According to some embodiments of the utility model, the insulating sheet satisfies the following requirements: 0.45 mm ≤ b1 ≤ 1.55 mm, 0.45 mm ≤ b2 ≤ 1.55 mm, and 0.45 mm ≤ b3 ≤ 1.55 mm.

[0012] According to the insulating sheet of some embodiments of the present invention, the two large surface covering areas have the same extension length along the width direction of the insulating sheet; and / or the two overlapping areas have the same extension length along the width direction of the insulating sheet.

[0013] According to the insulating sheet of some embodiments of the present invention, the extending length of the overlapping area along the width direction of the insulating sheet is less than or equal to the extending length of the narrow surface coating area along the width direction of the insulating sheet; and / or, the extending length of the overlapping area along the width direction of the insulating sheet is greater than half of the extending length of the narrow surface coating area along the width direction of the insulating sheet.

[0014] According to the insulating sheet of some embodiments of the present invention, the extension length of the narrow surface coating area along the width direction of the insulating sheet is smaller than the extension length of the large surface coating area along the width direction of the insulating sheet, and is greater than the extension length of the overlapping area along the width direction of the insulating sheet.

[0015] The utility model also provides a battery pole group.

[0016] According to the battery electrode group of the embodiment of the utility model, it includes a bare battery cell and an insulating sheet as described in any one of the above items, wherein the insulating sheet is coated on the side of the bare battery cell, and the bare battery cell includes two large side surfaces distributed along the thickness direction and two narrow side surfaces distributed along the width direction, the two large surface coated areas are respectively adhered to the two large side surfaces, the narrow surface coated area is adhered to one of the narrow side surfaces, and the two overlapping areas are both adhered to the other narrow side surface.

[0017] The battery electrode group and the above-mentioned insulating sheet have the same advantages as those of the prior art, which will not be described in detail here.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of an insulating sheet according to an embodiment of the utility model;

[0021] Figure 2 is a cross-sectional view of a battery electrode group according to an embodiment of the utility model;

[0022] Figure 3 It is a schematic structural diagram of a battery electrode group according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] Battery electrode group 100,

[0025] Bare battery cell 1, insulating sheet 2, narrow surface coating area 21, large surface coating area 22, overlapping area 23, bending indentation 24, positive electrode cover plate 3, negative electrode cover plate 4, positive electrode lower plastic 5, side plate 6. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Reference below Figure 1-Figure 3 The insulating sheet 2 according to the embodiment of the utility model is described. The insulating sheet 2 has a high degree of fit with the bare battery cell 1, which facilitates the installation of the battery cell into the housing and improves the safety of use.

[0030] like Figure 1-Figure 3 As shown, according to an insulating sheet 2 of an embodiment of the utility model, a bare cell 1 of a blade battery is covered with the insulating sheet 2, and the insulating sheet 2 includes a narrow surface covering area 21, a large surface covering area 22 and an overlapping area 23 connected along the width direction. There are two large surface covering areas 22 and two overlapping areas 23, respectively, and they are located on both sides of the narrow surface covering. A bending indentation 24 is formed at the connection between two adjacent ones of the narrow surface covering area 21, the large surface covering area 22 and the overlapping area 23.

[0031] Specifically, the insulating sheet 2 is used to cover the outer side of the bare cell 1 of the blade battery, and is fixedly connected to the bare cell 1 by hot melting, gluing, etc., so as to protect the electrode group and avoid short circuit caused by overlapping of the electrode group and the battery shell, thereby improving the safety of battery use. The insulating sheet 2 is provided with a narrow surface coating area 21, a large surface coating area 22 and an overlapping area 23, and the narrow surface coating area 21 is connected to the large surface coating area 22, and the large surface coating area 22 is connected to the overlapping area 23. The large surface coating area 22 is set as two and the overlapping area 23 is also set as two. The two large surface coating areas 22 and the two overlapping areas 23 are respectively located on both sides of the narrow surface coating. The narrow surface coating area 21 is connected to the large surface coating area 22 and the large surface coating area 22 is connected to the overlapping area 23. Bending indentations 24 are provided at the connection between the narrow surface coating area 21 and the large surface coating area 22 and at the connection between the large surface coating area 22 and the overlapping area 23, so that the insulating sheet 2 can be bent quickly and accurately when it is coated on the outer side of the bare cell 1 of the blade battery, thereby improving assembly accuracy and assembly capacity.

[0032] The extension lengths of the narrow surface coating area 21, the large surface coating area 22 and the overlapping area 23 along the length direction of the insulating sheet 2 are all L, that is, the extension lengths of the narrow surface coating area 21, the large surface coating area 22 and the overlapping area 23 along the length direction of the insulating sheet 2 are all equal, wherein: L = M-a1-a2-k1-b1-b2, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover plate 3, a2 is the thickness of the negative electrode cover plate 4, k1 is the thickness of the positive electrode lower plastic 5, b1 is the distance from the insulating sheet 2 to the positive electrode lower plastic 5, and b2 is the distance from the insulating sheet 2 to the negative electrode The sum of the distance between the electrode covers 4, that is, the thickness of the positive electrode cover 3, the thickness of the negative electrode cover 4, the thickness of the positive lower plastic 5, the distance from the insulating sheet 2 to the positive lower plastic 5, the distance from the insulating sheet 2 to the negative electrode cover 4, and the length of the insulating sheet 2 is equal to the shoulder height of the battery cell, so that the insulating sheet 2 can just cover the outside of the bare battery cell 1 in the length direction, avoiding problems such as damage and wrinkles caused by the insulating sheet 2 being too long, improving the fit between the insulating sheet 2 and the bare battery cell 1, and also avoiding the insulating sheet 2 being too short, resulting in the battery electrode group 100 not being insulated from the battery shell, thereby improving the safety of use.

[0033] Or satisfy: L = M-a1-k1-b1-a2-k2-b3, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover 3, k1 is the thickness of the plastic 5 under the positive electrode, b1 is the distance from the insulating sheet 2 to the plastic 5 under the positive electrode, a2 is the thickness of the negative electrode cover 4, k2 is the thickness of the plastic under the negative electrode, b3 is the distance from the insulating sheet 2 to the plastic under the negative electrode, that is, the thickness of the positive electrode cover 3, the thickness of the negative electrode cover 4, the thickness of the plastic 5 under the positive electrode, the distance from the insulating sheet 2 to the plastic under the positive electrode 5, the thickness of the plastic under the negative electrode, the distance from the insulating sheet 2 to the plastic under the negative electrode, and the length of the insulating sheet 2 are equal to the shoulder height of the battery cell, so that the insulating sheet 2 can just cover the outside of the bare battery cell 1 in the length direction, avoiding problems such as damage and wrinkles caused by the insulating sheet 2 being too long, improving the fit between the insulating sheet 2 and the bare battery cell 1, and also avoiding the insulating sheet 2 being too short to cause the battery electrode group 100 to be not insulated from the battery shell, thereby improving the safety of use. Figure 1 The left-right direction is shown in the figure, and the length direction is as shown in the figure. Figure 1 The up and down directions shown in .

[0034] According to the insulating sheet 2 of the embodiment of the utility model, a narrow surface coating area 21, a large surface coating area 22 and an overlapping area 23 are provided, and a bending indentation 24 is provided, so that the insulating sheet 2 can be attached to the bare battery cell 1, and the extension length L of the narrow surface coating area 21, the large surface coating area 22 and the overlapping area 23 along the length direction of the insulating sheet 2 is set to satisfy: L = M-a1-a2-k1-b1-b2, or satisfy: L = M-a1-k1-b1-a2-k2-b3, which can improve the fit between the insulating sheet 2 and the bare battery cell 1, facilitate the installation of the battery cell into the shell, and reduce the risk of damage and wrinkles of the insulating sheet 2, thereby improving the safety of use, achieving better use effect and a wider range of applications.

[0035] In some embodiments, the extension length of the large surface coating area 22 along the width direction of the insulating sheet 2 is A, and satisfies: A=e+d+h, where e is the width of the battery cell electrode group, d is the thickness of the side panel 6 of the bare battery cell 1, and h is the thickness of the insulating sheet 2.

[0036] Specifically, Figure 1-Figure 2As shown, the extension length of the large surface coating area 22 along the width direction of the insulating sheet 2 is set to A, and A satisfies: A=e+d+h, wherein e is the width of the battery cell pole group, d is the thickness of the side plate 6 of the bare battery cell 1, and h is the thickness of the insulating sheet 2, that is, the extension length of the large surface coating area 22 along the width direction of the insulating sheet 2 is set to the sum of the width of the battery cell pole group, the thickness of the side plate 6 of the bare battery cell 1 and the thickness of the insulating sheet 2, so that the extension length of the large surface coating area 22 of the insulating sheet 2 in the width direction of the insulating sheet 2 can just cover the outside of the large side surface of the bare battery cell 1, avoiding problems such as damage and wrinkles of the insulating sheet 2 caused by the large surface coating area 22 being too long, improving the fit between the insulating sheet 2 and the bare battery cell 1, and also avoiding the large surface coating area 22 being too short The width leads to incomplete coating of the remaining areas, thereby improving safety in use.

[0037] In some embodiments, the extension length of the narrow surface coating region 21 along the width direction of the insulating sheet 2 is B, and satisfies: B=n+h, where n is the thickness of the battery cell electrode group, and h is the thickness of the insulating sheet 2.

[0038] Specifically, Figure 1 and Figure 3 As shown, the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2 is set to B, the thickness of the battery cell pole group is set to n, the thickness of the insulating sheet 2 is set to h, and it satisfies: B=n+h, that is, the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2 is set to be equal to the sum of the thickness of the battery cell pole group and the thickness of the insulating sheet 2, so that the extension length of the narrow surface coating area 21 of the insulating sheet 2 in the width direction of the insulating sheet 2 can just cover the outside of the narrow side of the bare battery 1, avoiding problems such as damage and wrinkles of the insulating sheet 2 caused by the narrow surface coating area 21 being too long, improving the fit between the insulating sheet 2 and the bare battery 1, and also avoiding the narrow surface coating area 21 being too short The width is incompletely coated in the remaining areas, thereby improving safety in use.

[0039] In some embodiments, the extending length of the overlapping region 23 along the width direction of the insulating sheet 2 is C, and satisfies: C=(n / 2+1)~n+h.

[0040] Specifically, Figure 1 and Figure 3As shown, the extension length of the overlapping area 23 along the width direction of the insulating sheet 2 is set to C, the thickness of the battery cell electrode group is set to n, and satisfies: C = (n / 2 + 1mm) ~ n, that is, the extension length of the overlapping area 23 along the width direction of the insulating sheet 2 is set to half of the thickness of the battery cell electrode group plus one millimeter to the sum of the thickness of the battery cell electrode group and the thickness of the insulating sheet 2, so that the extension length of the overlapping area 23 of the insulating sheet 2 in the width direction of the insulating sheet 2 can just cover the narrow side of the bare battery cell 1, avoiding problems such as damage and wrinkles of the insulating sheet 2 caused by the overlapping area 23 being too long, improving the fit between the insulating sheet 2 and the bare battery cell 1, and also avoiding the overlapping area 23 being too short to cause a gap between the two overlapping areas 23, thereby improving safety in use.

[0041] In some embodiments, M, a1, a2, k1 and k2 are quantitative values, b1, b2 and b3 are variable values, wherein M is the shoulder height of the bare cell 1, a1 is the thickness of the positive electrode cover 3, a2 is the thickness of the negative electrode cover 4, k1 is the thickness of the plastic 5 under the positive electrode, k2 is the thickness of the plastic under the negative electrode, b1 is the distance from the insulating sheet 2 to the plastic 5 under the positive electrode, b2 is the distance from the insulating sheet 2 to the negative electrode cover 4, and b3 is the distance from the insulating sheet 2 to the plastic under the negative electrode. M, a1, a2, k1 and k2 are all set values ​​when the battery electrode group 100 is produced, and b1, b2 and b3 are the set sizes of the insulating sheet 2. The size of the insulating sheet 2 can be changed by adjusting the values ​​of b1, b2 and b3, thereby adjusting the coating effect of the insulating sheet 2 on the bare cell 1 to meet different usage requirements.

[0042] In some embodiments, the insulating sheet 2 satisfies: 0.45mm≤b1≤1.55mm, 0.45mm≤b2≤1.55mm, 0.45mm≤b3≤1.55mm, b1 is set to the distance from the insulating sheet 2 to the plastic 5 under the positive electrode, b2 is set to the distance from the insulating sheet 2 to the negative electrode cover 4, b3 is the distance from the insulating sheet 2 to the plastic under the negative electrode, and b1 satisfies: 0.45mm≤b1≤1.55mm, that is, the distance from the insulating sheet 2 to the plastic 5 under the positive electrode can be set to 0.45mm, 1.5mm and 1.55mm, etc. In this embodiment, the distance from the insulating sheet 2 to the plastic 5 under the positive electrode is set to 1.5mm, and b2 satisfies: 0.45mm≤b2≤1.55mm, that is, the distance from the insulating sheet 2 to the negative electrode cover 4 can be set to 0.45mm, 1mm and 1.55mm, etc. In this embodiment, the distance from the insulating sheet 2 to the negative electrode cover 4 is set to 1mm, and b3 satisfies: 0.45mm≤b3≤1.55mm, that is, the distance from the insulating sheet 2 to the plastic under the negative electrode can be set to 0.45mm, 1.5mm and 1.55mm, etc., which can improve the covering effect of the insulating sheet 2 on the bare battery cell 1, avoid the problem of damage and wrinkles of the insulating sheet 2 caused by the excessive width of the overlapping area 23, and improve the safety of use.

[0043] In some embodiments, the two large surface covering regions 22 have the same extension length along the width direction of the insulating sheet 2 , and / or the two overlapping regions 23 have the same extension length along the width direction of the insulating sheet 2 .

[0044] Specifically, Figure 1 As shown, the insulating sheet 2 is provided with two large surface coating areas 22, and the two large surface coating areas 22 are respectively connected to both sides of the narrow surface coating area 21, and the extension lengths of the two large surface coating areas 22 along the width direction of the insulating sheet 2 are the same. At the same time, the extension lengths of the two large surface coating areas 22 along the length direction of the insulating sheet 2 are both L, that is, the two large surface coating areas 22 are symmetrically arranged on both sides of the narrow surface coating area 21.

[0045] Furthermore, the insulating sheet 2 is provided with two overlapping areas 23, and the two overlapping areas 23 are respectively connected to the two large surface coating areas 22, and the extension lengths of the two overlapping areas 23 along the width direction of the insulating sheet 2 are the same. At the same time, the extension lengths of the two overlapping areas 23 along the length direction of the insulating sheet 2 are both L, that is, the two overlapping areas 23 and the two large surface coating areas 22 are symmetrically arranged on both sides of the narrow surface coating area 21, thereby ensuring the consistency of the wrapping of the bare battery cell 1 in each area and improving the wrapping effect of the insulating sheet 2 on the bare battery cell 1.

[0046] In some embodiments, the extending length of the overlapping region 23 along the width direction of the insulating sheet 2 is less than or equal to the extending length of the narrow surface coating region 21 along the width direction of the insulating sheet 2, and / or, the extending length of the overlapping region 23 along the width direction of the insulating sheet 2 is greater than half of the extending length of the narrow surface coating region 21 along the width direction of the insulating sheet 2.

[0047] Specifically, the bare cell 1 is configured as a rectangular parallelepiped, the insulating sheet 2 is coated on the outside of the side of the bare cell 1, and two large surface coating areas 22 are correspondingly coated on the outside of the two large side surfaces of the rectangular parallelepiped, a narrow surface coating area 21 is correspondingly coated on the outside of a narrow side surface of the rectangular parallelepiped, and two overlapping areas 23 are simultaneously coated on the outside of a narrow side surface of the rectangular parallelepiped, the narrow side surface of the rectangular parallelepiped correspondingly coated by the narrow surface coating area 21 is the same size as the narrow side surface of the rectangular parallelepiped coated by the two overlapping areas 23, and the extension length of the overlapping area 23 along the width direction of the insulating sheet 2 is set to be less than or equal to the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2, so as to avoid the two overlapping areas 23 from piling up outside the same narrow side surface of the rectangular parallelepiped, causing problems such as damage and wrinkles of the insulating sheet 2, and thereby improve the fit between the insulating sheet 2 and the bare cell 1.

[0048] Furthermore, the extension length of the overlapping area 23 along the width direction of the insulating sheet 2 is set to be greater than half of the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2, that is, the sum of the extension lengths of the two overlapping areas 23 along the width direction of the insulating sheet 2 is greater than the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2. This can avoid incomplete coating of the two overlapping areas 23 on the same narrow side of the cuboid, resulting in short circuits and other problems, thereby improving safety in use.

[0049] In some embodiments, the extension length of the narrow surface coating region 21 along the width direction of the insulating sheet 2 is smaller than the extension length of the large surface coating region 22 along the width direction of the insulating sheet 2 and is greater than the extension length of the overlapping region 23 along the width direction of the insulating sheet 2 .

[0050] Specifically, Figure 1 As shown, the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2 is smaller than the extension length of the large surface coating area 22 along the width direction of the insulating sheet 2, that is, the narrow surface coating area 21 can be coated on the outside of the narrow side of the bare battery cell 1, and the large surface coating area 22 can be coated on the outside of the large side of the bare battery cell 1, thereby improving the coating effect of the insulating sheet 2 on the bare battery cell 1.

[0051] Furthermore, the extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2 is greater than the extension length of the overlapping area 23 along the width direction of the insulating sheet 2. The overlapping area 23 is set to two. The two overlapping areas 23 can overlap and coat the same narrow side of the bare battery cell 1, or they can just join and coat the same narrow side of the bare battery cell 1. The narrow surface coating area 21 needs to be coated separately on the narrow side of the bare battery cell 1. The extension length of the narrow surface coating area 21 along the width direction of the insulating sheet 2 is set to be greater than the extension length of the overlapping area 23 along the width direction of the insulating sheet 2. This can ensure the coating effect of the narrow surface coating area 21 on the narrow side of the bare battery cell 1, and can also avoid the overlapping area 23 being set too long, which may cause damage, wrinkles and other problems on the insulating sheet 2, thereby improving the fit between the insulating sheet 2 and the bare battery cell 1.

[0052] The utility model also provides a battery electrode group 100 .

[0053] The battery electrode group 100 according to the embodiment of the utility model comprises a bare battery cell 1 and any one of the above-mentioned insulating sheets 2 .

[0054] Specifically, the insulating sheet 2 is coated on the outside of the side of the bare battery cell 1, and the bare battery cell 1 includes two large side surfaces distributed along the thickness direction and two narrow side surfaces distributed along the width direction. The two large surface coating areas 22 are respectively adhered to the two large side surfaces, the narrow surface coating area 21 is adhered to one narrow side surface, and the two overlapping areas 23 are both adhered to the other narrow side surface, so that the large surface coating area 22, the narrow surface coating area 21 and the overlapping area 23 are all coated on the outside of different side surfaces of the bare battery cell 1, thereby ensuring the fit of the coating, reducing the risk of damage and wrinkles of the insulating sheet 2, and improving safety of use.

[0055] According to the battery electrode group 100 of the embodiment of the utility model, a narrow surface coating area 21, a large surface coating area 22 and an overlapping area 23 are provided, and a bending indentation 24 is provided, so that the insulating sheet 2 is conveniently fitted to the bare battery cell 1, and the extension length L of the narrow surface coating area 21, the large surface coating area 22 and the overlapping area 23 along the length direction of the insulating sheet 2 is set to satisfy: L = M-a1-a2-k1-b1-b2, or satisfy: L = M-a1-k1-b1-a2-k2-b3, which can improve the fit between the insulating sheet 2 and the bare battery cell 1, facilitate the installation of the battery cell into the shell, and reduce the risk of damage, wrinkles, etc. of the insulating sheet 2, thereby improving the safety of use, achieving better use effect and a wider range of applications.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An insulating sheet, which is used to cover the bare cell of a blade battery, characterized in that: The insulating sheet comprises a narrow surface coating region, a large surface coating region and an overlapping region connected along the width direction, the large surface coating region and the overlapping region are two and are respectively located on both sides of the narrow surface coating, a bending indentation is formed at the connection between two adjacent ones of the narrow surface coating region, the large surface coating region and the overlapping region, and the extension lengths of the narrow surface coating region, the large surface coating region and the overlapping region along the length direction of the insulating sheet are all L; Among them, it satisfies: L=M-a1-k1-b1-a2-b2, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover, k1 is the thickness of the plastic under the positive electrode, b1 is the distance from the insulating sheet to the plastic under the positive electrode, a2 is the thickness of the negative electrode cover, and b2 is the distance from the insulating sheet to the negative electrode cover; or satisfies: L=M-a1-k1-b1-a2-k2-b3, M is the shoulder height of the battery cell, a1 is the thickness of the positive electrode cover, k1 is the thickness of the plastic under the positive electrode, b1 is the distance from the insulating sheet to the plastic under the positive electrode, a2 is the thickness of the negative electrode cover, k2 is the thickness of the plastic under the negative electrode, and b3 is the distance from the insulating sheet to the plastic under the negative electrode.

2. The insulating sheet according to claim 1, characterized in that: The extension length of the large surface coating area along the width direction of the insulating sheet is A, and satisfies: A=e+d+h, wherein e is the width of the battery cell electrode group, d is the thickness of the side plate of the bare battery cell, and h is the thickness of the insulating sheet.

3. The insulating sheet according to claim 1, characterized in that: The extension length of the narrow surface coating area along the width direction of the insulating sheet is B, and satisfies: B=n+h, wherein n is the thickness of the battery cell electrode group, and h is the thickness of the insulating sheet.

4. The insulating sheet according to claim 3, characterized in that: The extending length of the overlapping area along the width direction of the insulating sheet is C, and satisfies: C=(n / 2+1)~n+h.

5. The insulating sheet according to any one of claims 1 to 4, characterized in that: M, a1, a2, k1 and k2 are quantitative values, and b1, b2 and b3 are variable values.

6. The insulating sheet according to claim 5, characterized in that: Satisfies: 0.45mm≤b1≤1.55mm, 0.45mm≤b2≤1.55mm, 0.45mm≤b3≤1.55mm.

7. The insulating sheet according to claim 1, characterized in that: The two large surface coating regions have the same extension length along the width direction of the insulating sheet; And / or, the two overlapping regions have the same extension length along the width direction of the insulating sheet.

8. The insulating sheet according to claim 1, characterized in that: The extending length of the overlapping area along the width direction of the insulating sheet is less than or equal to the extending length of the narrow surface covering area along the width direction of the insulating sheet; And / or, an extension length of the overlapping region along the width direction of the insulating sheet is greater than half of an extension length of the narrow surface covering region along the width direction of the insulating sheet.

9. The insulating sheet according to claim 1, characterized in that: An extension length of the narrow surface coating region along the width direction of the insulating sheet is smaller than an extension length of the large surface coating region along the width direction of the insulating sheet, and is larger than an extension length of the overlapping region along the width direction of the insulating sheet.

10. A battery electrode group, characterized in that: It comprises a bare battery cell and an insulating sheet as described in any one of claims 1 to 9, wherein the insulating sheet is coated on the outside of the side of the bare battery cell, and the bare battery cell comprises two large side surfaces distributed along the thickness direction and two narrow side surfaces distributed along the width direction, the two large surface coated areas are respectively adhered to the two large side surfaces, the narrow surface coated area is adhered to one of the narrow side surfaces, and the two overlapping areas are both adhered to the other narrow side surface.

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