Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery. The battery cell comprises a pole group and a protective film, tabs are arranged on two opposite sides of the pole group along the first direction; the protective films wrap the peripheral side of the pole group, the number of the protective films is one or more, the protective films are arranged in the circumferential direction of the pole group, the circumferential direction of the pole group is perpendicular to the first direction, and the ends, in the circumferential direction of the pole group, of the protective films are fixed to the pole group through adhesive tape. According to the battery cell disclosed by the embodiment of the utility model, the protective film is arranged on the peripheral side of the pole group, so that potential safety hazards such as short circuit caused by contact between the pole group and the outside can be avoided. The one or more protective films are arranged in the circumferential direction of the pole group, and the ends, in the circumferential direction of the pole group, of the protective films are fixed to the pole group through the adhesive tape, so that the fixing mode of the protective films on the pole group is simple, the cost can be reduced, the fixing speed of the protective films on the pole group can be higher, and the production efficiency can be improved.

Description

Technical Field

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

[0002] At present, in order to prevent the battery cells in lithium-ion batteries from contacting the battery shell and causing a short circuit, a protective film is usually coated on the outer side of the electrode group. In related technologies, the protective film is often fixed to the outer side of the electrode group by thermal plastic sealing, which makes the battery preparation speed slow. How to increase the fixing speed of the protective film on the electrode group and thus improve the production efficiency of the battery remains to be solved. 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 propose a battery cell, which can prevent the electrode group from contacting the outside world (such as the battery housing) and causing safety hazards such as short circuits by providing a protective film on the outer peripheral side of the electrode group. The protective film is one or multiple protective films are provided along the circumference of the electrode group, and the ends of the protective film along the circumferential direction of the electrode group are fixed to the electrode group by tape, so that the fixing method of the protective film on the electrode group is simple, which can reduce costs, and can make the fixing speed of the protective film on the electrode group faster, which can improve production efficiency.

[0004] The utility model also provides a battery with the battery core.

[0005] According to the first aspect of the utility model, the battery cell includes: a pole group, the pole group having pole ears on opposite sides along a first direction; a protective film, the protective film is coated on the outer peripheral side of the pole group, the protective film is one or a plurality of protective films are arranged along the circumference of the pole group, the circumference of the pole group is perpendicular to the first direction, and the end of the protective film along the circumferential direction of the pole group is fixed to the pole group by tape.

[0006] According to the battery cell of the embodiment of the utility model, by providing a protective film on the outer circumference of the electrode group, it is possible to avoid the electrode group from contacting the outside world (such as the battery housing) and causing safety hazards such as short circuits. By providing one protective film or multiple protective films arranged along the circumference of the electrode group and fixing the ends of the protective films along the circumference of the electrode group to the electrode group by tape, the fixing method of the protective film on the electrode group is simple, which can reduce costs, and can make the fixing speed of the protective film on the electrode group faster, which can improve production efficiency.

[0007] According to some embodiments of the present invention, the adhesive tape is in the shape of an elongated strip and extends along the first direction.

[0008] According to some embodiments of the present invention, in the circumferential direction of the pole group, two adjacent ends of the protective film are fixed to the pole group by the same adhesive tape.

[0009] According to some embodiments of the present invention, in the circumferential direction of the pole group, two adjacent ends of the protective film are overlapped or butted along the circumferential direction of the pole group or spaced apart in the circumferential direction of the pole group.

[0010] According to some embodiments of the present invention, there are multiple protective films, and the multiple protective films are the same.

[0011] According to some embodiments of the present invention, there are two protective films, and the ends of the two protective films are located on the large surface, side surface or corner of the pole group.

[0012] According to some embodiments of the present invention, the thickness of the protective film ranges from 0.15 mm to 0.25 mm.

[0013] According to some embodiments of the present invention, the protective film is a PP film, a PE film or a PET film; and / or the melting temperature of the protective film is not less than 150°C.

[0014] According to some embodiments of the present invention, the impact strength of the protective film is not less than 2kg / cm 2 ; The insulation resistance of the protective film is not less than 500MΩ.

[0015] A battery according to an embodiment of the second aspect of the utility model comprises: a shell; and a battery cell according to an embodiment of the first aspect of the utility model, wherein the battery cell is arranged in the shell.

[0016] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery cell and providing a protective film on the outer peripheral side of the electrode group, it is possible to avoid safety hazards such as short circuit caused by contact between the electrode group and the outside world (such as the battery housing), thereby improving the safety performance of the battery.

[0017] 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

[0018] 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:

[0019] Figure 1 is a schematic diagram of a battery cell according to the first embodiment of the utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the protective film in;

[0021] Figure 3is a schematic diagram of a battery cell according to the second embodiment of the utility model;

[0022] Figure 4 yes Figure 3 Schematic diagram of the protective film in;

[0023] Figure 5 is a schematic diagram of a battery cell according to Embodiment 3 of the present utility model;

[0024] Figure 6 yes Figure 5 Schematic diagram of the protective film in;

[0025] Figure 7 is a schematic diagram of a battery cell according to a fourth embodiment of the present utility model;

[0026] Figure 8 yes Figure 7 Schematic diagram of the protective film in;

[0027] Fig. 9 is a schematic diagram of a battery cell according to Embodiment 5 of the present utility model;

[0028] Fig.10 yes Fig. 9 Schematic diagram of the protective film in;

[0029] Fig.11 is a schematic diagram of a battery cell according to Embodiment 6 of the present utility model;

[0030] Fig.12 yes Fig.11 Schematic diagram of the protective film in;

[0031] Fig.13 is a schematic diagram of a battery cell according to Embodiment 7 of the present utility model;

[0032] Fig.14 yes Fig.13 Schematic diagram of the protective film in;

[0033] Fig.15 is a schematic diagram of a battery cell according to Embodiment 8 of the present utility model;

[0034] Fig.16 yes Fig.15 Schematic diagram of the protective film.

[0035] Reference numerals:

[0036] 100. Battery cell;

[0037] 1. Pole group;

[0038] 2. Protective film; 21. End. DETAILED DESCRIPTION

[0039] 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.

[0040] Reference below Figure 1-Figure 16 A battery cell 100 according to an embodiment of the present invention is described.

[0041] Reference Figure 1 , Figure 4 and Fig.14 According to the battery cell 100 of the first aspect of the utility model, it includes a pole group 1 and a protective film 2. The pole group 1 has pole ears on two opposite sides along the first direction. The protective film 2 is coated on the outer peripheral side of the pole group 1. The protective film 2 is one or multiple protective films 2 are arranged along the circumference of the pole group 1. The circumference of the pole group 1 is perpendicular to the first direction. The end 21 of the protective film 2 along the circumferential direction of the pole group 1 is fixed to the pole group 1 by tape. The protective film 2 is coated on the outer peripheral side of the pole group 1, which can prevent the pole group 1 from contacting with the outside world (such as the battery casing) and causing safety hazards such as short circuits.

[0042] Among them, the protective film 2 is one or multiple ones arranged along the circumference of the pole group 1, and the end 21 of the protective film 2 along the circumferential direction of the pole group 1 is fixed to the pole group 1 by tape, so that the fixing method of the protective film 2 on the pole group 1 is simple, which can reduce costs, and can make the fixing speed of the protective film 2 on the pole group 1 faster, which can improve production efficiency.

[0043] According to the battery cell 100 of the embodiment of the utility model, by providing a protective film 2 on the outer peripheral side of the electrode group 1, it is possible to prevent the electrode group 1 from contacting the outside world (such as the battery housing) and causing safety hazards such as short circuits. The protective film 2 is one or multiple protective films are provided along the circumference of the electrode group 1, and the end 21 of the protective film 2 along the circumference of the electrode group 1 is fixed to the electrode group 1 by tape, so that the fixing method of the protective film 2 on the electrode group 1 is simple, which can reduce costs, and the fixing speed of the protective film 2 on the electrode group 1 can be faster, which can improve production efficiency.

[0044] Reference Figure 1 , Figure 4 and Fig.14 According to some embodiments of the utility model, the adhesive tape is in the shape of a long strip and extends along the first direction, which can simplify the fixing method of the protective film 2 on the electrode group 1, thereby protecting the electrode group 1, and can make the fixing speed of the protective film 2 on the electrode group 1 faster, thereby improving production efficiency.

[0045] Reference Figure 1 , Figure 4 and Fig.14According to some embodiments of the utility model, in the circumferential direction of the pole group 1, two adjacent ends 21 of the protective film 2 are fixed to the pole group 1 by the same tape, which can make the fixing method of the protective film 2 on the pole group 1 simple and relatively stable, thereby improving the assembly efficiency of the protective film 2 on the pole group 1.

[0046] For example, the protective film 2 can be one, and in the circumferential direction of the pole group 1, the two ends 21 of the protective film 2 can be overlapped on the side of the pole group 1, and the ends 21 of the protective film 2 can be fixed to the pole group 1 by the same tape to complete the assembly of the protective film 2 on the pole group 1.

[0047] For another example, there may be two protective films 2. In the circumferential direction of the pole group 1, two adjacent ends 21 of the protective film 2 may be overlapped on the large surface or the side surface. The ends 21 of the protective film 2 may be fixed to the pole group 1 by the same adhesive tape, thereby completing the assembly of the protective film 2 on the pole group 1.

[0048] For another example, there may be two protective films 2. In the circumferential direction of the pole group 1, two adjacent ends 21 of the protective film 2 may be spaced apart on the large surface or the side surface. The two adjacent ends 21 of the protective film 2 may be fixed to the pole group 1 by the same adhesive tape, thereby completing the assembly of the protective film 2 on the pole group 1.

[0049] For another example, there can be two protective films 2. In the circumferential direction of the pole group 1, the two adjacent ends 21 of the protective film 2 can be located on the large surface, side surface or corner. The two adjacent ends 21 of the protective film 2 can be fixed to the pole group 1 by the same tape to complete the assembly of the protective film 2 on the pole group 1.

[0050] Reference Figure 1 , Figure 4 and Fig.14 According to some embodiments of the utility model, in the circumferential direction of the pole group 1, two adjacent ends 21 of the protective film 2 are overlapped or butted along the circumferential direction of the pole group 1 or spaced in the circumferential direction of the pole group 1. For example, in the circumferential direction of the pole group 1, two adjacent ends 21 of the protective film 2 may be overlapped; for another example, two adjacent ends 21 of the protective film 2 may be butted along the circumferential direction of the pole group 1; for another example, the protective film 2 may be spaced in the circumferential direction of the pole group 1. By overlapping or butting along the circumferential direction of the pole group 1 or spaced in the circumferential direction of the pole group 1, the protective film 2 can be applied to pole groups 1 of different sizes, the utilization rate of the protective film 2 can be improved, and the manufacturing cost can be reduced.

[0051] Reference Figure 1 and Figure 4According to some embodiments of the present invention, there are multiple protective films 2, and the multiple protective films 2 are all the same, which can simplify the production of the protective films 2 and reduce the increase in manufacturing costs caused by producing multiple protective films 2.

[0052] Reference Figure 4 , Fig.10 and Fig.16 According to some embodiments of the utility model, there are two protective films 2, and the ends 21 of the two protective films 2 are located on the large surface, side surface or corner of the pole group 1. For example, there are two protective films 2, and the ends 21 of the two protective films 2 can be located on the large surface of the pole group 1, and the protective film 2 can be quickly fixed to the pole group 1 by tape; for another example, there are two protective films 2, and the ends 21 of the two protective films 2 can be located on the side surface of the pole group 1, and the protective film 2 can be quickly fixed to the pole group 1 by tape; for another example, there are two protective films 2, and the ends 21 of the two protective films 2 can be located at the corners of the pole group 1, and the protective film 2 can be quickly fixed to the pole group 1 by tape.

[0053] By locating the ends 21 of the two protective films 2 on the large surface, side surface or corner of the electrode group 1 , the assembly method of the protective films 2 can be diversified, thereby improving the assembly efficiency of the protective films 2 .

[0054] Reference Figure 2 and Figure 4 According to some embodiments of the present invention, the thickness of the protective film 2 ranges from 0.15 mm to 0.25 mm. For example, the thickness of the protective film 2 can be 0.15 mm, 0.18 mm, 0.20 mm, 0.22 mm, etc. By making the thickness of the protective film 2 not less than 0.15 mm, the thickness of the protective film 2 itself can be sufficient to protect the electrode group 1; by making the thickness of the protective film 2 not greater than 0.25 mm, the thickness of the protective film 2 can be thin enough, so that the overall volume of the protective film 2 coated on the electrode group 1 can be less changed than the volume of the electrode group 1.

[0055] By setting the thickness of the protective film 2 to a range of 0.15 mm to 0.25 mm, the thickness of the protective film 2 itself can be sufficient to protect the electrode group 1; and the thickness of the protective film 2 can be made thin enough so that the overall volume of the protective film 2 coated on the electrode group 1 changes less than the volume of the electrode group 1.

[0056] Reference Figure 2 and Figure 4 According to some embodiments of the present invention, the protective film 2 is a PP film, a PE film or a PET film, which can make the protective film 2 have higher stability.

[0057] Reference Figure 2 and Figure 4According to some embodiments of the present invention, the melting temperature of the protective film 2 is not less than 150° C., so that the protective film 2 can still protect the electrode group 1 when the temperature of the electrode group 1 is high.

[0058] Reference Figure 2 and Figure 4 According to some embodiments of the present invention, the protective film 2 is a PP film, a PE film or a PET film and the melting temperature of the protective film 2 is not less than 150°C, so that the protective film 2 has a higher stability and can still protect the electrode group 1 when the temperature of the electrode group 1 is high.

[0059] Reference Figure 2 and Figure 4 According to some embodiments of the present invention, the impact strength of the protective film 2 is not less than 2kg / cm 2 ; The insulation resistance of the protective film 2 is not less than 500MΩ. For example, the impact strength of the protective film 2 can be 2.5kg / cm 2 , 3kg / cm 2 , 4kg / cm 2 , 6kg / cm 2 The insulation resistance of the protective film 2 can be 600MΩ, 800MΩ, 900MΩ, 1000MΩ, etc. The impact strength of the protective film 2 is not less than 2kg / cm 2 ; It can ensure that the protective film 2 has sufficient impact resistance and can prevent foreign matter from damaging the electrode group 1; the insulation resistance of the protective film 2 is not less than 500MΩ, which can protect the electrode group 1 and prevent the electrode group 1 from contacting the outside world and causing safety hazards such as short circuits.

[0060] Reference Figure 1 and Figure 3 According to the second aspect of the present invention, the battery comprises: a housing; and the battery cell 100 according to the first aspect of the present invention, the battery cell 100 being disposed in the housing.

[0061] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery cell 100 and providing a protective film 2 on the outer peripheral side of the electrode group 1, it is possible to avoid safety hazards such as short circuit caused by contact between the electrode group 1 and the outside (such as the battery housing), thereby improving the safety performance of the battery.

[0062] 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.

[0063] 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. A battery cell, characterized in that: include: A pole group, wherein the pole group has pole ears on two opposite sides along a first direction; A protective film is coated on the outer peripheral side of the pole group. The protective film is one or multiple protective films are arranged along the circumference of the pole group. The circumference of the pole group is perpendicular to the first direction. The end of the protective film along the circumferential direction of the pole group is fixed to the pole group by tape.

2. The battery cell according to claim 1, characterized in that: The adhesive tape is in a long strip shape and extends along the first direction.

3. The battery cell according to claim 1, characterized in that: In the circumferential direction of the pole group, two adjacent ends of the protective film are fixed to the pole group by the same adhesive tape.

4. The battery cell according to claim 1, characterized in that: In the circumferential direction of the pole group, two adjacent ends of the protective film are overlapped or butted along the circumferential direction of the pole group or spaced apart in the circumferential direction of the pole group.

5. The battery cell according to claim 1, characterized in that: There are multiple protective films, and the multiple protective films are the same.

6. The battery cell according to claim 1, characterized in that: There are two protective films, and the ends of the two protective films are located on the large surface, side surface or corner of the pole group.

7. The battery cell according to claim 1, characterized in that: The thickness of the protective film ranges from 0.15 mm to 0.25 mm.

8. The battery cell according to claim 1, characterized in that: The protective film is a PP film, a PE film or a PET film; and / or the melting temperature of the protective film is not less than 150°C.

9. The battery cell according to claim 1, characterized in that: The impact strength of the protective film is not less than 2kg / cm 2 ; The insulation resistance of the protective film is not less than 500MΩ.

10. A battery, characterized in that: include: case; The battery cell according to any one of claims 1 to 9, wherein the battery cell is disposed in the shell.

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