Insulating film, battery cell, and battery

Abstract

The utility model discloses an insulating film, battery monomer and battery, the insulating film is used for the battery monomer, the battery monomer comprises a cover plate, a shell and a pole group located in the shell, the cover plate is connected with the two ends of the shell, the insulating film comprises an insulating film body and a protective piece, the insulating film body is coated on the peripheral side of the pole group, and the protective piece is arranged in the shell. The insulating film body is lapped and fixed with a lower insulating part of the battery monomer; the protection piece is located on the side, close to the pole group, of the insulation film body and abuts against the lower insulation piece. According to the insulating film provided by the utility model, the insulating film comprises the insulating film body and the protection piece, the protection piece is positioned on one side, close to the pole group, of the insulating film body, and the protection piece is used for increasing the connection strength of the insulating film body and the lower insulating piece and preventing the tab from opening the connection part of the insulating film body and the lower insulating piece; therefore, short circuit of the pole group is caused by contact between the tabs and the shell, and the safety of the single battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an insulating film, a battery monomer and a battery. Background Art

[0002] In the related art, the lower plastic of the cover plate and the bare cell insulating sheet are fixed by hot melt. Since the tab and the cover plate are welded horizontally at the same time, in order to avoid the tab, one side of the lower plastic is lower than the other side. The length of the lower plastic on the lower side is limited. The hot melt fixing point of the lower plastic on the lower side and the bare cell insulating sheet is relatively weak. There is a problem that after the tab is bent, the bare cell insulating sheet and the fixing point of the lower plastic are stretched and short-circuited with the shell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an insulating film, the insulating film comprising an insulating film body and a protective member, the protective member is used to increase the connection strength between the insulating film body and the lower insulating member, and improve the safety of the battery cell.

[0004] The utility model also provides a battery monomer having the insulating film.

[0005] The utility model also provides a battery having the battery monomer.

[0006] The insulating film according to the first aspect of the present invention is used for a battery cell, and the battery cell includes a cover plate, a shell and a pole group located in the shell, and the cover plate is connected to both ends of the shell, including: an insulating film body, the insulating film body is coated on the outer peripheral side of the pole group and is located in the shell, the insulating film body is overlapped and fixed with the lower insulating part of the cover plate; a protective part, the protective part is located on the side of the insulating film body close to the pole group and abuts against the lower insulating part.

[0007] According to the insulating film of the embodiment of the utility model, the insulating film includes an insulating film body and a protective member. The protective member is located on a side of the insulating film body close to the pole group. The protective member is used to increase the connection strength between the insulating film body and the lower insulating member to prevent the pole ear from stretching the connection between the insulating film body and the lower insulating member, causing the pole ear to contact the shell and cause a short circuit of the pole group, thereby improving the safety of the battery cell.

[0008] According to some embodiments of the present invention, a notch is provided on the lower insulating member, and the protective member is located in the notch.

[0009] According to some embodiments of the present invention, the protective member has a first inclined portion, the lower insulating member has a second inclined portion matching the first inclined portion, and the second inclined portion is arranged close to the notch.

[0010] According to some embodiments of the present invention, the thickness of the protective member is a, satisfying 0.5 mm ≤ a ≤ 1.5 mm.

[0011] According to some embodiments of the present invention, the width of the protective member is b, satisfying 2.0 mm ≤ b ≤ 3.0 mm.

[0012] According to some embodiments of the present invention, the protective component is an integrally formed injection molded component.

[0013] A battery cell according to an embodiment of the second aspect of the utility model includes: an insulating film according to an embodiment of the first aspect of the utility model.

[0014] According to the battery cell of the embodiment of the utility model, by providing the above-mentioned insulating film, it is prevented that the pole ear stretches the connection between the insulating film body and the lower insulating member, causing the pole ear to contact with the shell and cause a short circuit of the pole group, thereby improving the safety of the battery cell.

[0015] According to some embodiments of the present invention, the battery cell includes: a pole group, a pole ear is connected to one end of the pole group, the pole ear has a bent portion, and the protective member is arranged opposite to the bent portion.

[0016] According to some embodiments of the present invention, the electrode tab is a negative electrode tab.

[0017] The battery according to the embodiment of the third aspect of the utility model includes: the battery cell according to the embodiment of the second aspect of the utility model.

[0018] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery cell, it is prevented that the pole ear stretches the connection between the insulating film body and the lower insulating member, causing the pole ear to contact with the shell and cause a short circuit of the pole group, thereby improving the safety of the battery cell and further improving the safety of the battery.

[0019] 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

[0020] 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:

[0021] Figure 1 is a schematic diagram of an insulating film according to some embodiments of the utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the middle protection part;

[0023] Figure 3yes Figure 1 A schematic diagram of the middle protective member in another direction;

[0024] Figure 4 yes Figure 1 a side view of the middle protection member;

[0025] Figure 5 It is a schematic diagram of the cooperation between the cover plate and the housing according to some embodiments of the utility model;

[0026] Figure 6 is a cross-sectional view of a cover plate according to some embodiments of the utility model.

[0027] Reference numerals:

[0028] 10. Battery cells;

[0029] 11. Cover plate; 12. Lower insulating member; 121. Notch; 13. Pole group; 14. Pole ear;

[0030] 2. Insulating film; 21. Insulating film body; 22. Protective member; 221. First inclined portion. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the description of the present utility model, 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] Reference below Figure 1-Figure 6 The insulating film 2 according to the embodiment of the present invention is described.

[0035] According to the insulating film 2 of the embodiment of the first aspect of the utility model, the insulating film 2 is used for a battery cell 10, and the battery cell 10 includes a cover plate 11, a shell and a pole group 13 located in the shell, and pole ears 14 are connected to both ends of the pole group 13. The cover plate 11 is connected to both ends of the shell. When the cover plate 11 is installed to both ends of the shell, the cover plate 11 bends the pole ears 14 in the shell and is located between the cover plate 11 and the pole group 13.

[0036] The insulating film 2 includes an insulating film body 21 and a protective member 22. The insulating film body 21 is coated on the outer peripheral side of the pole group 13 and is located in the shell. The insulating film body 21 can prevent the pole group 13 from contacting the shell and preventing the pole group 13 from short-circuiting. The insulating film body 21 is overlapped and fixed with the lower insulating member 12 of the cover plate 11 to prevent the pole ear 14 from contacting the shell and preventing the pole group 13 from short-circuiting.

[0037] The protective member 22 is located on the side of the insulating film body 21 close to the pole group 13, and the protective member 22 is in contact with the lower insulating member 12. The protective member 22 is used to increase the strength of the connection and fixation between the insulating film body 21 and the lower insulating member 12 to prevent the pole ear 14 from stretching the connection between the insulating film body 21 and the lower insulating member 12, causing the pole ear 14 to contact the shell and cause the pole group 13 to short-circuit, thereby improving the safety of the battery cell 10; and the protective member 22 is arranged on the side of the insulating film body 21 close to the pole group 13, which can prevent the protective member 22 from occupying too much internal space of the battery cell 10, thereby improving the energy density of the battery cell 10.

[0038] According to the insulating film 2 of the embodiment of the utility model, the insulating film 2 includes an insulating film body 21 and a protective member 22. The protective member 22 is located on the side of the insulating film body 21 close to the pole group 13. The protective member 22 is used to increase the connection strength between the insulating film body 21 and the lower insulating member 12 to prevent the pole ear 14 from stretching the connection between the insulating film body 21 and the lower insulating member 12, causing the pole ear 14 to contact the shell and cause the pole group 13 to short-circuit, thereby improving the safety of the battery cell 10.

[0039] According to some embodiments of the present invention, referring to Figure 1-Figure 6 A notch 121 is provided on the lower insulating member 12 , and the protective member 22 is located in the notch 121 , which can further prevent the protective member 22 from occupying the internal space of the battery cell 10 , thereby improving the utilization rate of the internal space of the battery cell 10 .

[0040] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The protective member 22 has a first inclined portion 221, and the lower insulating member 12 has a second inclined portion matched with the first inclined portion 221, and the second inclined portion is arranged near the notch 121. The protective member 22 is located in the notch 121, and the protective member 22 can be well positioned through the cooperation of the first inclined portion 221 and the second inclined portion, thereby improving the accuracy of the position of the protective member 22; at the same time, the cooperation of the first inclined portion 221 and the second inclined portion can make the protective member 22 completely abut against the lower insulating member 12, thereby better preventing the tab 14 from contacting the shell, and further improving the safety of the battery cell 10.

[0041] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The thickness of the protective member 22 is a, which satisfies 0.5 mm ≤ a ≤ 1.5 mm. For example, the thickness of the protective member 22 may be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm or 1.5 mm.

[0042] The thickness of the lower insulating member 12 and the insulating film body 21 is about 0.1 mm, while the thickness of the protective member 22 is much greater than the thickness of the lower insulating member 12 and the insulating film body 21, which can well increase the connection strength between the lower insulating member 12 and the insulating film body 21. If the thickness of the protective member 22 is less than 0.5 mm, the protective member 22 is too thin and cannot increase the connection strength between the lower insulating member 12 and the insulating film body 21; if the thickness of the protective member 22 is greater than 1.5 mm, the protective member 22 will occupy too much internal space of the battery cell 10, which is not conducive to increasing the energy density of the battery cell 10.

[0043] According to some embodiments of the present invention, referring to Figure 1-Figure 4 , the width of the protective member 22 is b, which satisfies 2.0 mm ≤ b ≤ 3.0 mm. For example, the width of the protective member 22 may be 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm or 3.0 mm. Within this range, the width of the protective member 22 does not occupy too much of the internal space of the battery cell 10, and can also increase the connection strength between the lower insulating member 12 and the insulating film body 21.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 4The protective member 22 is an integrally formed injection-molded member, which can provide the protective member 22 with an insulating function, and also make the processing technology of the protective member 22 simple and the structural strength strong.

[0045] The battery cell 10 according to the second embodiment of the utility model includes: the insulating film 2 according to the first embodiment of the utility model.

[0046] According to the battery cell 10 of the embodiment of the utility model, the insulating film 2 is provided to prevent the pole ear 14 from stretching the connection between the insulating film body 21 and the lower insulating member 12 to cause the pole ear 14 to contact the shell and cause the pole group 13 to short-circuit, thereby improving the safety of the battery cell 10.

[0047] According to some embodiments of the present invention, referring to Figure 1-Figure 6 The battery cell 10 includes a pole group 13, at one end of which is connected a pole ear 14, the pole ear 14 having a bent portion, the protective member 22 being arranged opposite to the bent portion, the bent portion of the pole ear 14 having a force acting toward the outside of the shell, and the protective member 22 being arranged on one side of the bent portion of the pole ear 14, so that the force of the bent portion can act on the protective member 22, the structural strength of the protective member 22 is relatively strong, and the bent portion can be prevented from stretching the connection between the insulating film body 21 and the lower insulating member 12.

[0048] According to some embodiments of the present invention, referring to Figure 1-Figure 6 The tab 14 is a negative tab 14. When the negative tab 14 is bent between the shell and the cover plate 11, the negative tab 14 is easy to stretch the connection between the insulating film body 21 and the lower insulating member 12; and an end plate is provided at the bent portion of the positive tab 14, and the end plate is used to isolate the positive tab 14 from the shell.

[0049] Refer to the following Figure 1-Figure 6 An insulating film 2 and a battery cell 10 having the same according to an embodiment of the present invention are described.

[0050] The battery cell 10 includes a shell, an electrode group 13, an insulating film 2 and a cover plate 11. The insulating film 2 includes an insulating film body 21 and a protective member 22. The insulating film body 21 is coated on the outer peripheral side of the electrode group 13 and is located in the shell; a positive electrode tab 14 and a negative electrode tab 14 are respectively connected to the two ends of the electrode group 13. The cover plate 11 includes a lower insulating member 12. An end plate is connected between the positive electrode tab 14 and the shell to isolate the positive electrode tab 14 from the shell.

[0051] When the shell and the cover plate 11 are fixedly connected, the cover plate 11 is placed in a horizontal direction, and the negative pole tab 14 extends from the shell to be connected to the pole of the cover plate 11. In order to avoid the negative pole tab 14, a notch 121 is provided on the lower insulating member 12, resulting in the height of the side of the lower insulating member 12 close to the negative pole tab 14 being lower than the height of the side away from the negative pole tab 14. The height of the lower insulating member 12 on the side close to the negative pole tab 14 is h2, and the height of the lower insulating member 12 on the side away from the negative pole tab 14 is h1, and h1>h2.

[0052] The negative pole ear 14 is passed through the notch 121 and connected to the pole, the cover plate 11 is flipped toward the direction of the shell, and the negative pole ear 14 is folded, a bending portion is formed on the negative pole ear 14, the protective member 22 is located in the notch 121, and connects and fixes the insulating film body 21, the protective member 22 and the lower insulating member 12, thereby increasing the connection strength between the insulating film body 21 and the lower insulating member 12, and the protective member 22 is arranged opposite to the bending portion, thereby preventing the bending portion from stretching the connection between the lower insulating member 12 and the insulating film 2, causing the negative pole ear 14 to contact with the shell, resulting in a short circuit in the battery cell 10, thereby improving the safety of the battery cell 10.

[0053] The battery according to the embodiment of the third aspect of the utility model comprises: the battery cell 10 according to the embodiment of the second aspect of the utility model.

[0054] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery cell 10, it is prevented that the pole ear 14 stretches the connection between the insulating film body 21 and the lower insulating member 12, causing the pole ear 14 to contact with the shell and cause the pole group 13 to short-circuit, thereby improving the safety of the battery cell 10 and further improving the safety of the battery.

[0055] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. 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.

[0056] 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 film for a battery cell, the battery cell comprising a cover plate, a shell and a pole group located in the shell, the cover plate is connected to both ends of the shell, characterized in that: include: An insulating film body, the insulating film body is covered on the outer peripheral side of the pole group and is located in the shell, and the insulating film body is overlapped and fixed with the lower insulating member of the cover plate; A protective member is located on a side of the insulating film body close to the pole group and abuts against the lower insulating member.

2. The insulating film according to claim 1, wherein The lower insulating member is provided with a notch, and the protective member is located in the notch.

3. The insulating film according to claim 2, characterized in that The protection member has a first inclined portion, and the lower insulating member has a second inclined portion matched with the first inclined portion, and the second inclined portion is arranged close to the notch.

4. The insulating film according to claim 1, wherein The thickness of the protective member is a, satisfying 0.5 mm ≤ a ≤ 1.5 mm.

5. The insulating film according to claim 1, wherein The width of the protective member is b, which satisfies 2.0 mm ≤ b ≤ 3.0 mm.

6. The insulating film according to claim 1, wherein The protective part is an integrally formed injection molded part.

7. A battery cell, characterized in that: include: The insulating film according to any one of claims 1 to 6.

8. The battery cell according to claim 7, characterized in that: include: The pole group has a pole ear connected to one end of the pole group, the pole ear has a bent portion, and the protective member is arranged opposite to the bent portion.

9. The battery cell according to claim 8, characterized in that: The electrode tab is a negative electrode tab.

10. A battery, characterized in that: include: The battery cell according to any one of claims 7 to 9.

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