Single battery and battery pack

Abstract

The utility model discloses a single battery which comprises a battery shell, and the battery shell is provided with a battery cell large surface, a battery cell side surface and a battery cell bottom surface; the insulating film is provided with a film body large face, a film body side face and a film body bottom face, the film body large face is attached to the battery cell large face, the film body bottom face is attached to the battery cell bottom face, the film body side face is attached to the battery cell side face, the film body side face covers at least part of the battery cell side face, and a film body adjacent face is defined by the film body bottom face and the film body side face; a cutting line is arranged on the adjacent surface of the film body from one side edge far away from the bottom surface of the film body to the bottom surface of the film body, so that the adjacent surface of the film body can be folded to the side surface of the cell, and a gap area is formed between the side surface of the film body and the adjacent surface of the film body; the sealing film at least covers the gap area, the sealing film is arranged on the insulating film in a stacked mode, and the number of layers of the sealing film is not more than three. Meanwhile, the utility model further discloses a battery pack applying the single battery, and the problem that the layer difference of coating films on the same side wall of an existing shell is too large is solved.

Description

Technical Field

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

[0002] The single cell includes a shell and a coating film wrapped around the shell. The coating film is used to insulate the shell and protect the shell. The existing U-shaped coating film overlaps at most five layers on the same side wall of the shell, and at least two layers, which makes the layer difference of the coating film on the same side wall of the shell too large, affecting the assembly of the single cell in the battery pack or battery pack. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art described above, the utility model provides a single cell and a battery pack to solve the problem of too large layer difference of the coating film on the same side wall of the existing shell.

[0004] The technical solution adopted by the utility model to solve the problem is:

[0005] A single battery, comprising:

[0006] A battery case, the battery case comprising a battery cell bottom surface, a battery cell top surface, two oppositely disposed battery cell large surfaces, and two oppositely disposed battery cell side surfaces, the battery cell bottom surface being oppositely disposed to the battery cell top surface;

[0007] An insulating film, wherein the insulating film has a large film surface, a film side surface, and a film bottom surface, wherein the large film surface is attached to the large film surface of the battery cell, the film bottom surface is attached to the battery cell bottom surface, the film side surface is attached to the battery cell side surface, and the film side surface covers at least a portion of the battery cell side surface, the film bottom surface and the film side surface are surrounded by a film body adjacent surface, and the film body adjacent surface is provided with a cutting line from a side edge away from the film body bottom surface toward the film body bottom surface, so that the film body adjacent surface can be folded to the battery cell side surface, and the film body side surface and the film body adjacent surface form a gap area;

[0008] A sealing film, wherein the sealing film at least covers the gap area, and the sealing film is stacked on the insulating film, and the number of stacked layers does not exceed three.

[0009] In this way, by setting cutting lines on the adjacent surfaces of the film body, the adjacent surfaces of the film body can be folded and attached to the side surfaces of the battery cell of the battery shell. At the same time, the sealing film is attached to the side surfaces of the film body of the insulating film and the gap area surrounded by the adjacent surfaces of the film body. This can not only better cover the blue film of the single cell exposed in the gap area to better ensure the insulation and safety of the single cell, but also better resist the pulling force applied to the insulating film by the expansion of the single cell, thereby ensuring its structural strength and stability.

[0010] More importantly, the number of stacked layers of the sealing film and the insulating film does not exceed three, so that the side of the battery cell of the battery shell can ensure good flatness after the insulating film and the sealing film are attached, solving the problem of excessive layer difference of the coating film on the same side wall of the existing shell, and facilitating the assembly of the single cell into the battery pack and the battery pack.

[0011] The utility model also discloses a battery pack using the single cell battery. Based on the safety of the single cell battery, the safety of the battery pack and the battery pack is improved. Meanwhile, the single cell battery is easy to assemble in the battery pack with a small assembly tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a first structural schematic diagram of the battery housing in the utility model;

[0013] Figure 2 This is a second structural schematic diagram of the battery housing in the present utility model;

[0014] Figure 3 This is a schematic diagram of the explosion structure of a single battery of the utility model;

[0015] Figure 4 It is a schematic diagram of the insulating film in the utility model in an unfolded state;

[0016] Figure 5 It is a three-dimensional structural diagram of the insulating film in the utility model in a semi-folded and wrapped state;

[0017] Figure 6 It is a three-dimensional structural diagram of the insulating film in the utility model in a folded and wrapped state;

[0018] Figure 7 It is a schematic diagram of folding and pasting a single battery of the utility model;

[0019] Figure 8 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0020] Icons: 1-battery case, 11-large surface of battery cell, 12-side surface of battery cell, 13-bottom surface of battery cell, 14-top surface of battery cell, 2-insulating film, 21-large surface of membrane body, 22-side surface of membrane body, 23-bottom surface of membrane body, 24-adjacent surface of membrane body, 25-cutting line, 3-gap area, 4-sealing film, 51-side folding line, 52-adjacent folding line, 53-internal folding line, 54-large surface folding line, 61-common stacking area, 62-cutting stacking area. DETAILED DESCRIPTION

[0021] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions 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 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 invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] Please combine the specific Figure 1 and Figure 2 As shown, the utility model discloses a single battery, wherein the single battery is preferably a square battery, and the single battery comprises a battery housing 1 and an insulating film 2, wherein the battery housing 1 is in a rectangular parallelepiped shape, and the battery housing 1 has a large surface 11 of a battery cell, a side surface 12 of a battery cell, a bottom surface 13 of a battery cell and a top surface 14 of a battery cell, wherein the top surface 14 of the battery cell is a side wall of the battery housing 1 where an electrode is arranged, and the bottom surface 13 of the battery cell is a side arranged opposite to the top surface 14 of the battery cell, as shown in FIG. Figure 1 As shown, the H direction is the height direction of the battery case 1 of the single cell, that is, the height direction of the battery case 1 is the direction of the battery case 1 from the bottom surface 13 of the battery cell to the top surface 14 of the battery cell. The large surface 11 of the battery cell and the side surface 12 of the battery cell are both located on the circumferential side of the battery case 1 in the height direction. The large surface 11 of the battery cell is the side wall with the largest area in the battery case 1. The area of ​​the large surface 11 of the battery cell is greater than the area of ​​the side surface 12 of the battery cell. There are two large surfaces 11 of the battery cell, and the two large surfaces 11 are relatively distributed. There are two side surfaces 12 of the battery cell, and the two side surfaces 12 of the battery cell are relatively distributed.

[0025] For further details, please refer to Figure 3 and Figure 4As shown, the above-mentioned insulating film 2 has a large film surface 21, a film side surface 22, and a film bottom surface 23. The number of the large film surface 21 is preferably configured as two. The large film surface 21 is attached to the corresponding large surface 11 of the battery cell. Each of the two opposite sides of the large film surface 21 is configured with a film side surface 22. The film side surface 22 is attached to the battery cell side surface 12, and the film side surface 22 at least covers a portion of the battery cell side surface 12, that is, the sum of the areas of the two film side surfaces 22 of the same battery cell side surface 12 is less than or equal to the area of ​​the battery cell side surface 12, and the film bottom surface 23 is attached to the battery cell bottom surface 13.

[0026] The core solution of this embodiment is to combine Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the membrane bottom surface 23 and the membrane side surface 22 are surrounded by a membrane adjacent surface 24 , and a cutting line 25 is provided on the membrane adjacent surface 24 from a side away from the membrane bottom surface 23 toward the membrane bottom surface 23 , so that the membrane adjacent surface 24 can be folded to the battery cell side surface 12 .

[0027] Specifically, please combine Figure 5 and Figure 6 As shown, the adjacent surface 24 of the film body can be folded more conveniently and quickly under the action of the cutting line 25, and attached to the side surface 12 of the battery cell. At the same time, when both the side surfaces 22 of the film body are folded and attached to the side surface 12 of the battery cell, the number of layers of the folded overlap between the side surface 22 of the film body and the adjacent surface 24 of the film body is at most three layers, that is, Figure 4 As shown, after the film side faces 22 located on two opposite sides of the adjacent faces 24 of the film body are folded and attached to the same battery cell side face 12, each film side face 22 partially overlaps with the adjacent faces 24 of the film body and is folded to form a common stacking area 61. At this time, the number of layers of the common stacking area 61 is three, thereby reducing the layer difference of the insulating film 2 coated on the battery cell side face 12.

[0028] It should be noted that the specific Figure 4 , Figure 6 and Figure 8As shown, the adjacent surface 24 of the film body and the bottom surface 23 of the film body are folded to form an adjacent folding line 52, and the adjacent surface 24 of the film body is folded and deflected around the adjacent folding line 52 toward the battery cell side surface 12 of the battery housing 1, and the adjacent surface 24 of the film body and the side surface 22 of the film body are folded to form a side folding line 51, and the end of the side folding line 51 close to the bottom surface 23 of the film body is a folding common point, and the adjacent surface 24 of the film body is folded to form an internal folding line 53, and the internal folding line 53 extends obliquely from the folding common point toward the cutting line 25 until it intersects with the end of the cutting line 25 close to the adjacent folding line 52 ... adjacent surface 24 of the film body is folded to form an internal folding line 53, and the adjacent surface 24 of the film body is folded to form an internal folding line 53, and the adjacent surface 24 of the film body is folded to form an internal folding line 53, and the adjacent surface 24 of the film body is folded to form an internal folding line 53, and the adjacent surface 24 of the film body is folded to form an internal folding line 53, and the adjacent surface 24 of the film body is folded to form an internal folding line 53, During the folding and bonding process of the battery cell side surface 12, the adjacent surface 24 of the film body will be synchronously folded and deflected toward the side surface 22 of the film body around the side folding line 51, so that the inside of the adjacent surface 24 of the film body will bend and deform at the position of the internal folding line 53 toward the battery cell side surface 12 of the battery shell 1, and the inside of the adjacent surface 24 of the film body will be separated at the position of the cutting line 25. Then, when the side surface 22 of the film body is folded and bonded to the battery cell side surface 12 of the battery shell 1, the cutting line 25, the internal folding line 53, the adjacent folding line 52, and the side edge of the side surface 22 of the film body will surround the above-mentioned common stacking area 61.

[0029] It should be supplemented that the membrane side surface 22 and the membrane large surface 21 are folded to form a large surface folding line 54 , and the membrane side surface 22 is folded and deflected toward the cell side surface 12 of the battery housing 1 around the large surface folding line 54 .

[0030] It should also be noted that the length of the cutting line 25 is smaller than the length of the side folding line 51, which not only ensures that the inner part of the adjacent surface 24 of the film body can be folded to form an internal folding line 53. More importantly, it avoids the problem that the cutting line 25 cuts the adjacent folding line 52, which causes the insulating film 2 to easily expose the blue film of the single cell during the folding process, thereby effectively ensuring the safety of the single cell and its battery pack.

[0031] In addition, the membrane side surface 22 and the adjacent surface 24 of the membrane body are folded and fitted on the battery cell side surface 12, which can also ensure that when the single cell expands in the battery shell 1 under the charging and discharging state, the membrane side surface 22 and the battery cell side surface 12 of the battery shell 1 have a larger fitting area, so that it can better resist the pulling force applied to the insulating film 2 by the expansion of the single cell. The structural strength is high, which can effectively prevent the insulating film 2 on the battery cell side surface 12 from tearing, thereby improving the safety of the single cell; and when the single cell is assembled and used in a battery pack and a battery pack, the bottom surface 13 of the battery cell is matched with structural glue or a liquid cooling plate, and the top surface 14 of the battery cell is mostly matched with components, and the large surfaces 11 of the adjacent single cells are fitted to each other. Therefore, by comparison, the side surface 12 of the battery cell is more susceptible to wear and tear from other components in the battery pack or battery pack.

[0032] More importantly, if Figure 6As shown, the above-mentioned adjacent film faces 24 and two film side faces 22 form a gap area 3, that is, the gap area 3 is the area where the film side faces 22 connected to the two large film faces 21 and the adjacent film faces 24 do not cover the cell side faces 12. When the sum of the areas of the two film side faces 22 of the same cell side face 12 is less than the area of ​​the cell side face 12, that is, the length of the adjacent folding line 52 is greater than twice the length of the side folding line 51, at this time, the gap area 3 is a gap area. When the sum of the areas of the two film side faces 22 of the same cell side face 12 is equal to the area of ​​the cell side face 12, that is, the length of the adjacent folding line 52 is equal to twice the length of the side folding line 51, at this time, the gap area 3 is a blank gap.

[0033] In this embodiment, combined with Figure 3 and Figure 7 As shown, the single cell also includes a sealing film 4, which is stacked on the insulating film 2 and covers at least the above-mentioned gap area 3. In this way, the problem of the blue film on the outer surface of the battery casing 1 being exposed through the gap area 3 can be effectively avoided, thereby ensuring good insulation and safety of the single cell. Furthermore, the number of layers of the insulating film 2 and the sealing film 4 stacked together does not exceed three. In this way, the total layer difference of the insulating film 2 and the sealing film 4 coated on the side surface 12 of the battery cell is reduced, which is beneficial to improve the flatness of the side surface 12 of the battery casing 1 of the single cell after the insulating film 2 and the sealing film 4 are attached, thereby facilitating the assembly of the single cell into the battery pack and the battery pack.

[0034] It should be noted that the specific Figure 6 and Figure 7 As shown, the sealing film 4 is located on one side of the common stacking area 61 to ensure that the sealing film 4 and the common stacking area 61 are not overlapped, so that the number of layers of the insulating film 2 and the sealing film 4 stacked together does not exceed three, thereby better ensuring the flatness of the cell side 12 of the battery casing 1 after the insulating film 2 and the sealing film 4 are attached.

[0035] As a preferred method of this embodiment, please refer to Figure 6 and Figure 7 As shown, there are two cutting lines 25 on the adjacent surfaces 24 of the above-mentioned film body, and the two cutting lines 25 are preferably arranged in parallel, and a cutting stacking area 62 is configured between the two cutting lines 25, and the cutting stacking area 62 at least partially overlaps with the sealing film 4. In this way, it is ensured that the sealing film 4 can be better stacked and adhered to the cutting stacking area 62, so that it can completely cover the gap area 3, thereby ensuring the safety of the single battery, battery pack and battery pack.

[0036] It should be noted that if Figure 4 and Figure 8As shown, one of the two cutting lines 25 is defined as a first tangent line, and the other of the two cutting lines 25 is defined as a second tangent line, and the first tangent line is greater than or equal to the second tangent line.

[0037] It should also be noted that the side folding line 51 close to the first tangent is defined as the first folding line, the side folding line 51 close to the second tangent is defined as the second folding line, the spacing between the first tangent and the first folding line is the first spacing, the spacing between the second tangent and the second folding line is the second spacing, and the first spacing can be equal to the second spacing. Of course, the first spacing can also be unequal to the second spacing, which effectively improves the fault tolerance rate in the process of producing the single cell, reduces the production difficulty and production cost of the single cell, and at the same time, improves the production efficiency of the single cell.

[0038] As a further preferred embodiment of the present invention, the spacing between the sealing film 4 and the cutting stacking area 62 is defined as an overlapping spacing H, and the overlapping spacing H is greater than or equal to 2 mm, so as to ensure that the sealing film 4 can be better laminated and adhered to the cutting stacking area 62, thereby ensuring that the blue film of the single cell will not be exposed, thereby improving the safety of the single cell.

[0039] Based on the above single cell battery, the inventor also discloses a battery pack using the single cell battery. Based on the safety of the single cell battery, the safety of the battery pack and the battery pack is improved. Meanwhile, the single cell battery is easy to assemble in the battery pack, and the assembly tolerance is small.

[0040] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A single cell battery, characterized in that: include: A battery casing (1), the battery casing (1) comprising a battery cell bottom surface (13), a battery cell top surface (14), two battery cell large surfaces (11) arranged opposite to each other, and two battery cell side surfaces (12) arranged opposite to each other, the battery cell bottom surface (13) and the battery cell top surface (14) being arranged opposite to each other; An insulating film (2), the insulating film (2) comprising a large film surface (21), a film side surface (22), and a film bottom surface (23); the large film surface (21) is attached to the large cell surface (11); the film bottom surface (23) is attached to the cell bottom surface (13); the film side surface (22) is attached to the cell side surface (12); and the film side surface (22) covers at least a portion of the cell side surface (12); the film bottom surface (23) and the film side surface (22) are surrounded by a film adjacent surface (24); a cutting line (25) is provided on the film adjacent surface (24) from a side away from the film bottom surface (23) toward the film bottom surface (23), so that the film adjacent surface (24) can be folded to the cell side surface (12); and the film side surface (22) and the film adjacent surface (24) form a gap area (3); A sealing film (4), the sealing film (4) at least covers the gap area (3), the sealing film (4) is stacked on the insulating film (2), and the number of stacked layers does not exceed three.

2. The single cell according to claim 1, characterized in that: The adjacent surface (24) of the membrane body and the side surface (22) of the membrane body are folded to form a side folding line (51), and the length dimension of the cutting line (25) is smaller than the length dimension of the side folding line (51).

3. The single cell according to claim 2, characterized in that: The adjacent surface (24) of the membrane body is folded with the bottom surface (23) of the membrane body to form an adjacent folding line (52), and the length of the adjacent folding line (52) is greater than or equal to twice the length of the side folding line (51).

4. The single cell according to claim 2, characterized in that: An internal folding line (53) is formed by folding the adjacent surface (24) of the membrane body, and one end of the side folding line (51) close to the bottom surface (23) of the membrane body is a folding common point. The internal folding line (53) extends obliquely from the folding common point toward the cutting line (25).

5. The single cell according to claim 4, characterized in that: The membrane side surfaces (22) are arranged on two opposite sides of the adjacent surface (24) of the membrane body. In the same battery cell side surface (12), each of the membrane side surfaces (22) partially overlaps with the adjacent surface (24) of the membrane body and is folded to form a common stacking area (61). The number of stacking layers of the common stacking area (61) is three. The sealing film (4) is located on one side of the common stacking area (61).

6. The single cell according to claim 2, 4 or 5, characterized in that: The adjacent surface (24) of the film body has a cutting and laminating area (62) and two cutting lines (25), the cutting and laminating area (62) is located between the two cutting lines (25), and the cutting and laminating area (62) at least partially overlaps with the sealing film (4).

7. The single cell according to claim 6, characterized in that: The distance between the sealing film (4) and the cutting stacking area (62) is defined as an overlapping distance H, and the overlapping distance H is greater than or equal to 2 mm.

8. The single cell according to claim 6, characterized in that: One of the two cutting lines (25) is defined as a first tangent line, and the other of the two cutting lines (25) is defined as a second tangent line, wherein the first tangent line is greater than or equal to the second tangent line.

9. The single cell according to claim 8, characterized in that: The side folding line (51) close to the first tangent line is defined as a first folding line, the side folding line (51) close to the second tangent line is defined as a second folding line, the spacing between the first tangent line and the first folding line is defined as a first spacing, the spacing between the second tangent line and the second folding line is defined as a second spacing, and the first spacing and the second spacing are unequal or equal.

10. A battery pack, characterized in that: Comprising the single cell as claimed in any one of claims 1 to 9.

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