Battery and electric device

Abstract

The battery comprises a battery cell packaged by a packaging film, and the battery cell is provided with a bottom surface, a top surface, a large side surface and a small side surface, the bottom surface and the top surface are opposite to each other, and the large side surface and the small side surface are connected with the bottom surface and the top surface; the battery has a first direction which is perpendicular to the small side surface; the packaging film is provided with a top sealing edge, a side sealing edge and a connecting part, the top sealing edge is connected with the side sealing edge through the connecting part, the connecting part comprises a first bending area and a second bending area, the side sealing edge is bent towards the small side face and attached to the small side face, the first bending area is bent towards the top face and attached to the top face, and the second bending area and the top sealing edge are bent by a preset angle. The top sealing edge is bent towards the top surface and partially attached to the top surface, so that sealing edge protrusions are formed at the two ends of the top surface in the first direction. The battery length is shortened, and the battery capacity of the same size is increased; and the first bending area and the second bending area have supporting and limiting effects on the top sealing edge, so that the battery cell is protected, and the situation that the stress at the folding part is increased due to repeated folding and the folding part is damaged is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] A battery is a device that converts external energy into electrical energy and stores it inside to power external devices (such as portable electronic devices) when needed. Generally speaking, a battery includes a battery cell, a battery protection board, and insulating packaging accessories. With the rapid development of electronic devices, their functions are becoming more and more powerful and their sizes are becoming smaller and smaller. Existing batteries cannot meet the size requirements of electrical devices.

[0003] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a battery and an electrical device.

[0005] According to one aspect of the present application, the present application provides a battery, comprising a battery cell encapsulated by a packaging film, the battery cell having a bottom surface and a top surface facing away from each other, and a large side surface and a small side surface connecting the bottom surface and the top surface; the battery has a first direction, and the first direction is perpendicular to the small side surface; the packaging film has a top seal extending from the top surface, a side seal extending from the small side surface, and a connecting portion, the top seal is connected to the side seal through the connecting portion, the connecting portion includes a first bending area and a second bending area, the side seal is bent toward the small side surface and adheres to the small side surface, the first bending area is bent toward the top surface and adheres to the top surface, the second bending area is bent at a preset angle with the top seal, the top seal is bent toward the top surface and partially adheres to the top surface, so as to form edge sealing protrusions at both ends of the top surface in the first direction.

[0006] Furthermore, the angle between the first bending zone and the second bending zone is a, wherein 60°<a<150°; before bending, the top edge seal has a first edge away from the top surface, and the angle between the folded edge of the side edge seal and the first edge formed after bending to form the edge seal protrusion is b, wherein 0°<b<90°.

[0007] Furthermore, the battery cell is provided with at least two pole tabs, which are led out from the top surface, pass through the top sealing edge and extend outside the packaging film.

[0008] Furthermore, it also includes a protective plate and a flexible circuit board arranged on the protective plate, the flexible circuit board includes a first circuit board electrically connected to the pole ear through a connecting piece and a second circuit board arranged on both sides of the first circuit board in the first direction, the second circuit board is folded toward the first circuit board, and the pole ear is folded toward the top sealing edge.

[0009] Furthermore, an insulating sticker is pasted between the first circuit board and the second circuit board.

[0010] Furthermore, a connecting terminal is provided at the free end of the second circuit board.

[0011] Furthermore, an accommodating space is formed between the edge sealing protrusions, and the first circuit board or the second circuit board falls into the accommodating space.

[0012] Furthermore, the insulating film is a Mylar film, and the connecting sheet is a nickel sheet.

[0013] Furthermore, double-sided tape is provided between the protection plate and the top edge seal.

[0014] According to another aspect of the present application, there is provided an electrical device comprising any of the batteries described above.

[0015] A battery and an electrical device provided in an embodiment of the present application can shorten the length of the battery by bending the top seal and the side seal, so that the battery capacity of the same size battery can be increased. After bending, the two ends of the top seal in the first direction cover the first bending area and the second bending area to form a seal protrusion. The first bending area and the second bending area have a supporting and limiting effect on the top seal. The structure is stable, which is beneficial to the protection of the battery cell, and the stress at the folding point will not be increased due to multiple folding, resulting in damage to the folding point and affecting the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic structural diagram of a battery cell and a packaging film provided in an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of the structure after the top edge sealing and side edge sealing are bent, as provided in an embodiment of the present application.

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0021] Figure 5 It is a schematic diagram of the structure of the shaping and cutting of the pole ears provided in the embodiment of the application.

[0022] Figure 6 It is a schematic diagram of the connection structure between the pole ear and the protection plate provided in the application embodiment.

[0023] Figure 7 A schematic diagram of the bending of the connecting piece provided in the application embodiment.

[0024] Figure 8 A schematic diagram of the bending of the protection plate provided in the application embodiment.

[0025] Fig. 9 A schematic diagram of the installation of the insulation sticker provided for the application embodiment.

[0026] Fig.10 A schematic diagram of the structure of the folded second circuit board provided in the application embodiment.

[0027] Fig.11 for Fig.11 main view.

[0028] In the figure:

[0029] 1. Battery cell; 11. Tab; 12. Large side surface; 13. Bottom surface; 14. Top surface; 15. Small side surface; 2. Packaging film; 21. Connecting part; 211. First bending area; 212. Second bending area; 22. Top edge sealing; 221. First side; 23. Side edge sealing; 3. Edge sealing protrusion; 4. Protection plate; 5. Flexible circuit board; 51. First circuit board; 52. Second circuit board; 6. Connecting piece; 7. Insulating sticker; 8. Connecting terminal. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 mutual 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 this application can be understood according to specific circumstances.

[0032] A battery and an electrical device in the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] An embodiment of the present application provides a battery, comprising a battery cell encapsulated by a packaging film, the battery cell having a bottom surface and a top surface facing away from each other, and a large side surface and a small side surface connecting the bottom surface and the top surface; the battery has a first direction, and the first direction is perpendicular to the small side surface; the packaging film has a top seal extending from the top surface, a side seal extending from the small side surface, and a connecting portion, the top seal is connected to the side seal through the connecting portion, the connecting portion comprises a first bending area and a second bending area, the side seal is bent toward the small side surface and adhered to the small side surface, the first bending area is bent toward the top surface and adhered to the top surface, the second bending area is bent at a preset angle with the top seal, the top seal is bent toward the top surface and partially adhered to the top surface, so as to form seal protrusions at both ends of the top surface in the first direction.

[0034] The technical solution provided in the embodiment of the present application aims to shorten the length of the battery by bending the top seal and the side seal, so that the battery capacity of the same size battery can be increased. After bending, the two ends of the top seal in the first direction are covered on the first bending area and the second bending area to form a sealing protrusion. The first bending area and the second bending area have a supporting and limiting effect on the top seal. The structure is stable, which is beneficial to the protection of the battery cell, and the stress at the folding point will not be increased due to multiple folding, resulting in damage at the folding point and affecting the service life of the battery.

[0035] In the following embodiments, the battery includes but is not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery is used to provide electrical energy to electrical devices. The electrical device can be a mobile phone, a portable device, a laptop computer, an electric car, an electric car, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0036] See also Figure 1 , Figure 1 It is a schematic structural diagram of a battery cell and a packaging film provided in an embodiment of the present application.

[0037] In one embodiment, a battery includes a battery cell 1 and a packaging film 2 wrapped around the battery cell 1, wherein the battery cell 1 is provided with at least two pole tabs 11, and the battery cell 1 has a bottom surface 13 and a top surface 14 that are opposite to each other, and a large side surface 12 and a small side surface 15 connecting the bottom surface 13 and the top surface 14; in this embodiment, two pole tabs 11 are provided, and the two pole tabs 11 are led out from the top surface 14 and extend to the outside of the packaging film 2, and the packaging film 2 has a top sealing edge 22 extending from the top surface 14, a side sealing edge 23 extending from the small side surface 15, and a connecting portion 21.

[0038] It should be noted that the size of the small side surface 15 and the large side surface 12 is the size of the area, that is, the area of ​​the small side surface 15 is smaller than the area of ​​the large side surface 12; the top edge seal 22 is connected to the side edge seal 23 through the connecting portion 21, and the connecting portion 21 includes a first bending area 211 and a second bending area 212.

[0039] See also Figure 2 , Figure 2 It is a schematic diagram of the structure after the top edge sealing and side edge sealing are bent, as provided in an embodiment of the present application.

[0040] In one embodiment, the side sealing edge 23 is bent toward the small side surface 15 and is attached to the small side surface 15, and the connecting portion 21 is bent toward the top surface 14, so that the first bending area 211 is attached to the top surface 14, and the second bending area 212 is bent at a preset angle with the top sealing edge 22, and the top sealing edge 22 is bent toward the top surface 14 and partially attached to the top surface 14, and the bent top sealing edge 22 is in the first direction (such as Figure 1The two end covers (as shown in the X direction, the same below) are arranged above the first bending area 211 and the second bending area 212 to form an edge sealing protrusion 3.

[0041] It should be noted that the first direction is perpendicular to the small side surface 15, and the preset angle can be 0° or close to 0°, that is, the second bending area 212 and the top sealing edge 22 can be in a fitted state or in an adjacent state, which is set according to actual use; at the same time, the first bending area 211 is fitted on the top surface 14, and such a setting can ensure that the formed sealing edge protrusion 3 has a stable structure and ensures the safety of the battery cell 1, and the setting of the structure avoids excessive folding, prevents damage at the folding point, and affects the service life. The folding method in the prior art is not conducive to extending the service life, and compared with the three bends in this application, under the same volume, the present application can have a larger battery capacity.

[0042] It should be noted that in this embodiment, two tabs 11 are provided, and in other embodiments, other numbers may be provided, which is selected according to actual conditions; and the tabs 11 extend to the outside of the packaging film 2, specifically, the bottom of the tabs 11 is sealed by the tab glue and extends to the outside of the packaging film 2. Moreover, when the top sealing edge 22 is bent toward the top surface 14, the tabs 11 are also bent accordingly.

[0043] See also Figure 3 and Figure 4 , Figure 3 for Figure 2 The enlarged view of point A in the middle. Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0044] In one embodiment, the angle between the second bending zone 212 and the first bending zone 211 is a, wherein 60°<a<150°; before bending, the top edge 22 has a first edge 221 away from the top surface 14), and the angle between the folded edge of the side seal 23 and the first edge 211 after bending to form the seal protrusion 3 is b, wherein 0°<b<90°.

[0045] It should be noted that the above-mentioned first edge 221 is the free end of the top sealing edge 22, that is, the edge away from the top surface 14 before bending. The top sealing edge 22 forms a sealing protrusion 3 after bending. The first edges 221 located at both ends of the top sealing edge 22 in the first direction (that is, the first edge 221 within the range of the sealing protrusion 3) form an angle b with the folded edge of the side sealing edge 23. The angle b cannot be 0°. When it is 0°, the local stress of the folded edge of the top sealing edge 22 will become larger, and damage will occur; it cannot be 90° either. When it is 90°, it will affect the fit between the top sealing edge 22 and the top surface 14, affect the coating effect, and be detrimental to the protection of the battery cell 1.

[0046] See also Figure 6, Figure 6 It is a schematic diagram of the connection structure between the pole ear and the protection plate provided in the application embodiment.

[0047] In one embodiment, the battery further includes a protective plate 4 and a flexible circuit board 5 arranged on the protective plate 4, the flexible circuit board 5 including a first circuit board 51 and a second circuit board 52, the first circuit board 51 is electrically connected to the pole ear 11 through a connecting piece 6, and the second circuit board 52 is connected to both sides of the first circuit board 51 in the first direction; the second circuit board 52 is folded toward the first circuit board 51, and the pole ear 11 is folded toward the top sealing edge 22.

[0048] It should be noted that the connecting sheet 6 may be a nickel sheet, but is not limited thereto; the second circuit board 52 is folded over the first circuit board 51, that is, the first circuit board 51 is folded on the side away from the tab 11; and when the connecting sheet 6 is connected to the tab 11, the tab 11 needs to be bent (such as Figure 5 After the connection is completed, the protection plate 4 is folded 90° (as shown in FIG. Figure 7 After that, the tab 11 is folded toward the top sealing edge 22. At this time, the protection plate 4 is located between the first circuit board 51 and the top sealing edge 22 (as shown in FIG. Figure 8 As shown), a double-sided tape is provided between the protection plate 4 and the top sealing edge 22, which can ensure the stability of the protection plate 4 and further ensure the stability of the flexible circuit board 5; the bending through the above steps can effectively reduce the overall size of the battery and improve the battery capacity.

[0049] See also Fig. 9 , Fig. 9 A schematic diagram of the installation of the insulation sticker provided for the application embodiment.

[0050] In one embodiment, an insulating sticker 7 is pasted between the first circuit board 51 and the second circuit board 52. The insulating sticker 7 is provided to ensure stable use of the battery and improve safety. In this embodiment, the insulating sticker 7 can be a Mylar film, but is not limited thereto.

[0051] In addition, a connecting terminal 8 is disposed at the free end of the second circuit board 52 , and is electrically connected to the outside through the connecting terminal 8 , which will not be described in detail here.

[0052] See also Fig.10 and Fig.11 , Fig.10 A schematic diagram of the structure of the folded second circuit board provided in the application embodiment, Fig.11 for Fig.10 main view.

[0053] In one embodiment, an accommodating space is formed between the edge sealing protrusions 3, the first circuit board 51 or the second circuit board 52 falls into the accommodating space, and the flexible circuit board 5 is bent in the edge sealing protrusions 3, which has a certain protection effect on the flexible circuit board 5 from external interference and can reduce the size of the battery. Under the condition of the same size, the battery capacity is improved.

[0054] Therefore, a battery and an electrical device provided in an embodiment of the present application can shorten the length of the battery by bending the top seal and the side seal, so that the battery capacity of the same size battery can be increased. After bending, the two ends of the top seal in the first direction cover the first bending area and the second bending area to form a seal protrusion. The first bending area and the second bending area have a supporting and limiting effect on the opposite sides of the top seal. The structure is stable, which is beneficial to the protection of the battery cell, and the stress at the folding point will not be increased due to multiple folding, resulting in damage to the folding point and affecting the service life of the battery.

[0055] In the various embodiments of the present application, if there is no special explanation and logical conflict, the terms or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships. In the present application, "at least one" means one or more, and "more" means two or more.

[0056] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

[0057] The above is a detailed introduction to a battery and an electrical device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand a battery of the present application and its core idea. At the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery, characterized in that: The invention comprises a battery cell (1) encapsulated by an encapsulation film (2), wherein the battery cell (1) has a bottom surface (13) and a top surface (14) which are opposite to each other, and a large side surface (12) and a small side surface (15) which connect the bottom surface (13) and the top surface (14); The battery has a first direction (X), the first direction (X) being perpendicular to the small side surface (15); The packaging film (2) comprises a top sealing edge (22) extending from the top surface (14), a side sealing edge (23) extending from the small side surface (15), and a connecting portion (21); the top sealing edge (22) is connected to the side sealing edge (23) via the connecting portion (21); the connecting portion (21) comprises a first bending area (211) and a second bending area (212); the side sealing edge (23) is bent toward the small side surface (15) and adheres to the small side surface (15); the first bending area (211) is bent toward the top surface (14) and adheres to the top surface (14); the second bending area (212) and the top sealing edge (22) are bent at a preset angle; the top sealing edge (22) is bent toward the top surface (14) and partially adheres to the top surface (14), so as to form sealing protrusions (3) at both ends of the top surface (14) in the first direction (X).

2. The battery according to claim 1, characterized in that The angle between the first bending area (211) and the second bending area (212) is a, wherein 60°<a<150°; before bending, the top edge seal (22) has a first edge (221) away from the top surface (14); the angle between the folded edge of the side edge seal (23) and the first edge (221) formed after bending to form the edge seal protrusion (3) is b, wherein 0°<b<90°.

3. The battery according to claim 1, characterized in that The battery cell (1) is provided with at least two pole tabs (11), and the pole tabs (11) are led out from the top surface (14), pass through the top sealing edge (22), and extend to the outside of the packaging film (2).

4. The battery according to claim 3, characterized in that It also comprises a protective plate (4) and a flexible circuit board (5) arranged on the protective plate (4), the flexible circuit board (5) comprising a first circuit board (51) electrically connected to the pole ear (11) via a connecting piece (6) and a second circuit board (52) arranged on both sides of the first circuit board (51) in the first direction, the second circuit board (52) being folded toward the first circuit board (51), and the pole ear (11) being folded toward the top sealing edge (22).

5. The battery according to claim 4, characterized in that An insulating sticker (7) is pasted between the first circuit board (51) and the second circuit board (52).

6. The battery according to claim 4 or 5, characterized in that A connecting terminal (8) is provided at the free end of the second circuit board (52).

7. The battery according to claim 4, characterized in that An accommodating space is formed between the edge sealing protrusions (3), and the first circuit board (51) or the second circuit board (52) falls into the accommodating space.

8. The battery according to claim 5, characterized in that The insulating film (7) is a Mylar film, and the connecting sheet (6) is a nickel sheet.

9. The battery according to claim 8, characterized in that Double-sided adhesive is provided between the protection plate (4) and the top sealing edge (22).

10. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 9.

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