Pole group packaging film and battery pack

Abstract

The utility model discloses a pole group packaging film and a battery pack, the pole group packaging film comprises a first piece, a second piece and a third piece which are connected in sequence, first folds extending along the length direction of the pole group packaging film are formed between the first piece and the second piece and between the third piece and the second piece, and second folds extending along the length direction of the pole group packaging film are formed between the third piece and the second piece. The distance T1 between the two first creases is not smaller than the width T of the pole group, and the difference value between the distance T1 between the two first creases and the width T of the pole group is within the range of 1-3 mm. According to the pole group packaging film disclosed by the utility model, the difference value between the distance T1 between the two first creases and the width T of the pole group is controlled within the range of 1mm-3mm, so that the design parameters of the pole group packaging film are reasonable, the pole group packaging film effectively wraps the pole group, the safety of a battery cell is ensured, short circuit between the pole group and a shell is avoided, and the service life of the battery cell is prolonged. And the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a pole group packaging film and a battery pack. Background Art

[0002] Related technologies point out that the packaging film of the battery cell pole group serves to isolate the pole group from the battery cell shell to avoid short circuits between the pole group and the shell. Existing packaging films use unreasonable parameters such as penetration mark design or indentation design position, resulting in a high risk of short circuits between the pole group and the battery cell shell / low bending efficiency of production line equipment, which may eventually affect the normal performance of the battery cell. 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, the utility model provides a pole group packaging film, which realizes effective coating of the pole group by the pole group packaging film.

[0004] The utility model also provides a battery pack.

[0005] According to the first aspect of the utility model, the electrode group packaging film is used to cover the electrode group, including a first sheet, a second sheet and a third sheet connected in sequence, and a first fold extending along the length direction of the electrode group packaging film is formed between the first sheet and the second sheet and between the third sheet and the second sheet, and the distance T1 between the two first folds is not less than the width T of the electrode group, and the difference between the distance T1 between the two first folds and the width T of the electrode group is in the range of 1mm-3mm.

[0006] According to the electrode group packaging film of the utility model, by controlling the difference between the distance T1 between the two first folds and the width T of the electrode group within the range of 1mm-3mm, the design parameters of the electrode group packaging film are reasonable, the electrode group packaging film is effectively coated on the electrode group, the safety of the battery cell is ensured, the short circuit between the electrode group and the shell is avoided, and the production efficiency is improved.

[0007] In some embodiments, at least two second folds extending along the width direction of the pole group packaging film are formed on the second sheet, the length T2 of each second fold is less than the distance T1 between the first folds, and the difference between the length T2 of each second fold and the distance T1 between the first folds is in the range of 6mm-10mm; and / or, the side overlapping edge height T4 of the pole group packaging film is greater than the width T of the pole group, and the difference between the side overlapping edge height T4 of the pole group packaging film and the width T of the pole group is in the range of 3mm-5mm.

[0008] In some embodiments, the width T3 of the electrode group packaging film is T1+2*H, where H is the height of the electrode group.

[0009] In some embodiments, the length L1 of the electrode group packaging film satisfies the length L of the electrode group and the width T of the electrode group: 8mm≤L1-(L+T)≤13mm; and / or, at least two third folds extending along the width direction of the electrode group packaging film are formed on the first sheet, the distance L2 between any two adjacent third folds is greater than the length L of the electrode group, the difference between the distance L2 between any two adjacent third folds and the length L of the electrode group is in the range of 1.5mm-3mm, and in the width direction of the electrode group packaging film, the third fold is correspondingly formed on the third sheet.

[0010] In some embodiments, the length L3 of the first fold is smaller than the distance L2 between any two adjacent third folds, and the difference between the length L3 of the first fold and the distance L2 between any two adjacent third folds is in the range of 12 mm-16 mm.

[0011] In some embodiments, the width L4 of the second sheet is greater than the distance L2 between any two adjacent third folds, and the difference between the width L4 of the second sheet and the distance L2 between any two adjacent third folds is in the range of 40 mm-60 mm.

[0012] In some embodiments, the ratios of the depths of the first crease, the second crease, and the third crease to the thickness of the electrode group packaging film are all in the range of 1 / 3 to 1 / 2.

[0013] In other embodiments, a fourth fold is formed at both ends of the electrode group packaging film, and a distance T5 between the fourth fold and the end of the electrode group packaging film satisfies: 2mm≤T5-0.5T≤5mm, and a ratio between a depth of the fourth fold and a thickness of the electrode group packaging film is in a range of 1 / 3 to 1 / 2.

[0014] Further, the length L5 of the pole group packaging film is greater than the length L of the pole group, and the difference between the length L5 of the pole group packaging film and the length L of the pole group is in the range of 6mm-12mm; and / or, the width T6 of the pole group packaging film and the width T and height H of the pole group satisfy: 7mm≤T6-2(T+H)≤14mm.

[0015] A battery pack according to the second aspect of the utility model comprises the electrode group packaging film according to the first aspect of the utility model.

[0016] According to the battery pack of the utility model, by providing the electrode group packaging film of the first aspect, the safety performance of the battery pack is improved, the normal performance of the battery pack is ensured, the defective rate of the battery pack is reduced, and the production efficiency of the battery pack is improved.

[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] Figure 1 is a schematic diagram of a pole group packaging film according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of a side view of the electrode group packaging film shown in ;

[0020] Figure 3 is a schematic diagram of a pole group packaging film of another embodiment;

[0021] Figure 4 yes Figure 3 A schematic diagram of a side view of the electrode group packaging film shown in ;

[0022] Figure 5 yes Figure 3 Schematic diagram of the coating of the electrode group packaging film shown in;

[0023] Figure 6 yes Figure 5 A schematic diagram of the electrode group packaging film coating from another perspective shown in FIG.

[0024] Figure 7 It is a schematic diagram of a pole group packaging film according to another embodiment.

[0025] Reference numerals:

[0026] 100. Electrode group packaging film;

[0027] 1. The first piece; 2. The second piece; 3. The third piece;

[0028] 4. First fold; 5. Second fold; 6. Third fold; 7. Fourth fold;

[0029] 8. Tape. DETAILED DESCRIPTION

[0030] 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] Reference below Figure 1-Figure 7 The electrode group packaging film 100 according to the first embodiment of the utility model is described.

[0032] like Figure 1 , Figure 3 and Figure 7 As shown, the electrode group packaging film 100 according to the embodiment of the first aspect of the utility model includes: a first sheet 1, a second sheet 2 and a third sheet 3.

[0033] Specifically, the first sheet 1, the second sheet 2 and the third sheet 3 are connected in sequence, and a first fold 4 extending along the length direction of the electrode group packaging film 100 is formed between the first sheet 1 and the second sheet 2 and between the third sheet 3 and the second sheet 2, and the distance T1 between the two first folds 4 is not less than the width T of the electrode group, and the difference between the distance T1 between the two first folds 4 and the width T of the electrode group is within the range of 1mm-3mm. Therefore, the electrode group packaging film 100 can effectively cover the electrode group, reducing the difficulty of assembly.

[0034] According to the electrode group packaging film 100 of the embodiment of the utility model, by controlling the difference between the distance T1 between the two first folds 4 and the width T of the electrode group within the range of 1mm-3mm, the design parameters of the electrode group packaging film 100 are reasonable, the electrode group packaging film 100 is effectively coated on the electrode group, the safety of the battery cell is ensured, the short circuit between the electrode group and the shell is avoided, and the production efficiency is improved.

[0035] For example, the difference between the distance T1 between the two first folds 4 and the width T of the pole group can be: 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm and so on.

[0036] In one embodiment of the present invention, Figure 1As shown, at least two second folds 5 extending along the width direction of the electrode group packaging film 100 are formed on the second sheet 2, the length T2 of each second fold 5 is less than the distance T1 between the first folds 4, and the difference between the length T2 of each second fold 5 and the distance T1 between the first folds 4 is in the range of 6mm-10mm; and / or, the side overlap height T4 of the electrode group packaging film 100 is greater than the width T of the electrode group, and the difference between the side overlap height T4 of the electrode group packaging film 100 and the width T of the electrode group is in the range of 3mm-5mm. As a result, the design parameters of the electrode group packaging film 100 are reasonable, the electrode group packaging film 100 is effectively coated on the electrode group, and a short circuit between the electrode group and the shell is avoided.

[0037] For example, the difference between the length T2 of each second crease 5 and the distance T1 between the first crease 4 can be: 6.0mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7.0mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8.0mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9.0mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10.0mm and so on; the difference between the side overlapping edge height T4 of the electrode group packaging film 100 and the width T of the electrode group can be: 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm and so on.

[0038] In one embodiment of the present invention, Figure 1 As shown, the width T3 of the electrode group packaging film is T1+2*H, where H is the height of the electrode group. Thus, the design parameters of the electrode group packaging film 100 are reasonable, and the electrode group packaging film 100 effectively covers the electrode group, avoiding short circuit between the electrode group and the shell.

[0039] In one embodiment of the present invention, Figure 1As shown, the length L1 of the electrode group packaging film 100 satisfies the following conditions: 8mm≤L1-(L+T)≤13mm with the length L of the electrode group and the width T of the electrode group; and / or, at least two third folds 6 extending along the width direction of the electrode group packaging film 100 are formed on the first sheet 1, the distance L2 between any two adjacent third folds 6 is greater than the length L of the electrode group, the difference between the distance L2 between any two adjacent third folds 6 and the length L of the electrode group is within the range of 1.5mm-3mm, and in the width direction of the electrode group packaging film 100, the third fold 6 is correspondingly formed on the third sheet 3. Thus, the design parameters of the electrode group packaging film 100 are reasonable, the electrode group packaging film 100 is effectively coated on the electrode group, and a short circuit between the electrode group and the shell is avoided.

[0040] For example, the length L1 of the electrode group packaging film 100 can be: (L+T+8) mm, (L+T+9) mm, (L+T+10) mm, (L+T+11) mm, (L+T+12) mm, (L+T+13) mm, and so on.

[0041] In one embodiment of the present invention, Figure 1 As shown, the length L3 of the first fold 4 is less than the distance L2 between any two adjacent third folds 6, and the difference between the length L3 of the first fold 4 and the distance L2 between any two adjacent third folds 6 is in the range of 12 mm to 16 mm. Thus, the design parameters of the electrode group packaging film 100 are reasonable, and the electrode group packaging film 100 effectively covers the electrode group, thereby avoiding a short circuit between the electrode group and the shell.

[0042] For example, the difference between the length L3 of the first fold 4 and the distance L2 between any two adjacent third folds 6 can be: 12.0mm, 12.1mm, 12.2mm, 12.3mm, 12.4mm, 12.5mm, 12.6mm, 12.7mm, 12.8mm, 12.9mm, 13.0mm, 13.1mm, 13.2mm, 13.3mm, 13.4mm, 13.5mm, 13.6mm, 13.7mm m, 13.8mm, 13.9mm, 14.0mm, 14.1mm, 14.2mm, 14.3mm, 14.4mm, 14.5mm, 14.6mm, 14.7mm, 14.8mm, 14. 9mm, 15.0mm, 15.1mm, 15.2mm, 15.3mm, 15.4mm, 15.5mm, 15.6mm, 15.7mm, 15.8mm, 15.9mm, 16.0mm, etc.

[0043] In one embodiment of the present invention, Figure 1As shown, the width L4 of the second sheet 2 is greater than the distance L2 between any two adjacent third folds 6, and the difference between the width L4 of the second sheet 2 and the distance L2 between any two adjacent third folds 6 is in the range of 40 mm to 60 mm. Thus, the design parameters of the electrode group packaging film 100 are reasonable, and the electrode group packaging film 100 effectively covers the electrode group, thereby avoiding a short circuit between the electrode group and the shell.

[0044] For example, the difference between the width L4 of the second sheet 2 and the distance L2 between any two adjacent third folds 6 can be: 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm and so on.

[0045] In one embodiment of the present invention, Figure 1 As shown, the ratios of the depths of the first fold 4, the second fold 5 and the third fold 6 to the thickness of the electrode group packaging film 100 are all within the range of 1 / 3 to 1 / 2. Thus, the design parameters of the electrode group packaging film 100 are reasonable, and the electrode group packaging film 100 effectively covers the electrode group, thereby avoiding a short circuit between the electrode group and the shell.

[0046] For example, the ratio of the depth of the first fold 4 , the second fold 5 , and the third fold 6 to the thickness of the electrode group packaging film 100 may be: 1 / 3, 2 / 5, 9 / 20, 1 / 2, and so on.

[0047] In the above embodiment, if Figure 1 As shown, the electrode group is a square electrode group, and after the electrode group packaging film 100 covers the electrode group, no bottom tape 8 is required to be attached, and both ends of the second sheet 2 in the length direction have edges; in another embodiment of the utility model, as Figure 3 and Figure 5 As shown, the electrode group is a square electrode group. After the electrode group packaging film 100 covers the electrode group, the bottom tape 8 needs to be attached, and no edge is provided in the length direction of the second sheet 2, which reduces the powder of the electrode sheet in the electrode group from falling into the shell and reduces the risk of electrochemical corrosion of the shell.

[0048] In another embodiment of the present invention, Figure 7As shown, the electrode group is a blade electrode group, and the electrode group packaging film 100 is respectively formed with a fourth fold 7 at both ends, and the distance T5 between the fourth fold 7 and the end of the electrode group packaging film 100 satisfies: 2mm≤T5-0.5T≤5mm, and the ratio between the depth of the fourth fold 7 and the thickness of the electrode group packaging film 100 is in the range of 1 / 3 to 1 / 2. As a result, the design parameters of the electrode group packaging film 100 are reasonable, and the electrode group packaging film 100 is effectively coated on the electrode group, thereby avoiding a short circuit between the electrode group and the shell.

[0049] For example, the distance T5 between the fourth fold 7 and the end of the electrode group packaging film 100 can be: (2-0.5T) mm, (3-0.5T) mm, (4-0.5T) mm, (5-0.5T) mm, etc.; the ratio between the depth of the fourth fold 7 and the thickness of the electrode group packaging film 100 can be: 1 / 3, 2 / 5, 9 / 20, 1 / 2, etc.

[0050] Furthermore, if Figure 5 As shown, the length L5 of the electrode group packaging film 100 is greater than the length L of the electrode group, and the difference between the length L5 of the electrode group packaging film 100 and the length L of the electrode group is in the range of 6mm-12mm; and / or, the width T6 of the electrode group packaging film 100 and the width T and height H of the electrode group satisfy: 7mm≤T6-2(T+H)≤14mm. Thus, the design parameters of the electrode group packaging film 100 are reasonable, and the electrode group packaging film 100 effectively covers the electrode group, avoiding short circuit between the electrode group and the shell.

[0051] For example, the difference between the length L5 of the electrode group packaging film 100 and the length L of the electrode group can be: 6.0mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7.0mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8.0mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9.0mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm m, 10.0mm, 10.1mm, 10.2mm, 10.3mm, 10.4mm, 10.5mm, 10.6mm, 10.7mm, 10.8mm, 10.9mm, 11. 0mm, 11.1mm, 11.2mm, 11.3mm, 11.4mm, 11.5mm, 11.6mm, 11.7mm, 11.8mm, 11.9mm, 12.0mm, etc.;

[0052] The width T6 of the electrode group packaging film 100 can be: (7+2T+2H) mm, (8+2T+2H) mm, (9+2T+2H) mm, (10+2T+2H) mm, (11+2T+2H) mm, (12+2T+2H) mm, (13+2T+2H) mm, (14+2T+2H) mm, and so on.

[0053] The battery pack according to the embodiment of the second aspect of the utility model includes the electrode group packaging film 100 according to the embodiment of the first aspect of the utility model.

[0054] According to the battery pack of the embodiment of the utility model, by providing the electrode group packaging film 100 of the first embodiment, the safety performance of the battery pack is improved, the normal performance of the battery pack is ensured, the defective rate of the battery pack is reduced, and the production efficiency of the battery pack is improved.

[0055] In the description of the present invention, it should be understood 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; 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 invention can be understood according to specific circumstances.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] 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 electrode group packaging film, used for coating an electrode group, characterized in that: It comprises a first sheet, a second sheet and a third sheet which are connected in sequence, a first fold extending along the length direction of the electrode group packaging film is formed between the first sheet and the second sheet and between the third sheet and the second sheet, a distance T1 between two first folds is not less than a width T of the electrode group, and a difference between the distance T1 between two first folds and the width T of the electrode group is in the range of 1mm-3mm.

2. The electrode group packaging film according to claim 1, characterized in that: At least two second folds extending along the width direction of the electrode group packaging film are formed on the second sheet, the length T2 of each second fold is less than the distance T1 between the first folds, and the difference between the length T2 of each second fold and the distance T1 between the first folds is in the range of 6mm-10mm; And / or, the side overlapping edge height T4 of the electrode group packaging film is smaller than the width T of the electrode group, and the difference between the side overlapping edge height T4 of the electrode group packaging film and the width T of the electrode group is in the range of 3mm-5mm.

3. The electrode group packaging film according to claim 2, characterized in that: The width T3 of the electrode group packaging film is T1+2*H, where H is the height of the electrode group.

4. The electrode group packaging film according to claim 3, characterized in that: The length L1 of the electrode group packaging film satisfies the following conditions: 8mm≤L1-(L+T)≤13mm, the length L of the electrode group, and the width T of the electrode group. And / or, at least two third folds extending along the width direction of the pole group packaging film are formed on the first sheet, the distance L2 between any two adjacent third folds is greater than the length L of the pole group, the difference between the distance L2 between any two adjacent third folds and the length L of the pole group is in the range of 1.5mm-3mm, and the third fold is correspondingly formed on the third sheet in the width direction of the pole group packaging film.

5. The electrode group packaging film according to claim 4, characterized in that: The length L3 of the first fold is smaller than the distance L2 between any two adjacent third folds, and the difference between the length L3 of the first fold and the distance L2 between any two adjacent third folds is in the range of 12 mm-16 mm.

6. The electrode group packaging film according to claim 4, characterized in that: The width L4 of the second sheet is greater than the distance L2 between any two adjacent third folds, and the difference between the width L4 of the second sheet and the distance L2 between any two adjacent third folds is in the range of 40 mm-60 mm.

7. The electrode group packaging film according to claim 6, characterized in that: The ratios of the depths of the first crease, the second crease and the third crease to the thickness of the electrode group packaging film are all in the range of 1 / 3 to 1 / 2.

8. The electrode group packaging film according to claim 1, characterized in that: A fourth fold is formed at both ends of the electrode group packaging film, and a distance T5 between the fourth fold and the end of the electrode group packaging film satisfies: 2mm≤T5-0.5T≤5mm, and a ratio between the depth of the fourth fold and the thickness of the electrode group packaging film is in the range of 1 / 3 to 1 / 2.

9. The electrode group packaging film according to claim 8, characterized in that: The length L5 of the electrode group packaging film is greater than the length L of the electrode group, and the difference between the length L5 of the electrode group packaging film and the length L of the electrode group is in the range of 6mm-12mm; and / or, The width T6 of the electrode group packaging film and the width T and height H of the electrode group satisfy: 7mm≤T6-2(T+H)≤14mm.

10. A battery pack, characterized in that: The invention comprises the electrode group packaging film according to any one of claims 1 to 9.

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