Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of batteries, the single battery comprises: a shell having a first opening, a second opening and an inner cavity arranged between the first opening and the second opening; the first cover plate assembly covers the first opening; the second cover plate assembly covers the second opening; the electrode assembly is arranged in the inner cavity; an insulating film covering a peripheral side of the electrode assembly; the side plate is arranged in the inner cavity, the side plate is connected with the first cover plate assembly and the insulating film, and the side plate extends to the second opening from the first cover plate assembly; through the side plates, when the electrode assembly enters the shell, the electrode assembly can be uniformly stressed in a push-pull mode, the speed and the direction of the electrode assembly are controlled, the possibility that the electrode assembly deflects or inclines in the shell entering process is reduced, and therefore the shell entering posture of the electrode assembly is maintained, and the service life of the electrode assembly is prolonged. The distance between the insulating film and the inner wall is kept, and the possibility of generation of wrinkles is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a single battery, a battery pack and an electric device. BACKGROUND

[0002] In the structure of the battery cell, the outer side of the battery cell placed in the battery shell is wrapped with an insulating film, and the insulating film is used for safely isolating and protecting the battery cell. In the process of putting the battery cell into the shell in the later process, the battery cell is usually pushed into the opening on one side of the shell. Since the spacing between the battery cell and the shell is limited, and the battery cell is prone to deflection under the action of the pushing force, as the depth of the battery cell into the shell increases, the friction between the insulating film and the shell gradually increases, so that the pulling force on the insulating film in the length direction of the battery cell becomes larger and larger, so that the insulating film of the bare battery cell is prone to wrinkle, which affects the process yield. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims to solve the technical problem that the pulling force on the insulating film in the length direction of the battery cell becomes larger and larger when the battery cell is put into the shell at present, and the insulating film of the bare battery cell is prone to wrinkle. Another object of the application is to provide a battery pack. A third object of the application is to provide an electric device.

[0004] Technical scheme: The single battery provided in the embodiments of the application comprises:

[0005] a shell having a first opening, a second opening and an inner cavity provided between the first opening and the second opening;

[0006] a first cover plate assembly covering the first opening;

[0007] a second cover plate assembly covering the second opening;

[0008] an electrode assembly provided in the inner cavity;

[0009] an insulating film wrapping the outer side of the electrode assembly;

[0010] a side plate provided in the inner cavity, the side plate being connected with the first cover plate assembly and the insulating film respectively, and the side plate extending from the first cover plate assembly to the second opening.

[0011] In some embodiments, the insulating film is wrapped on the outer side of the side plate.

[0012] Alternatively, the insulating film is provided between the side plate and the electrode assembly.

[0013] In some embodiments, a plurality of side plates are provided, and each side plate is provided on the two sides of the electrode assembly.

[0014] In some embodiments, the first cover plate assembly comprises:

[0015] a cover disposed on the first plate body of the first opening;

[0016] a plastic part connected to the first plate body, the plastic part being located in the inner cavity and at least partially wrapped in the insulation film, the insulation film being provided with a gap for exposing a portion of the plastic part, the side plate being connected to the portion of the plastic part exposed from the insulation film.

[0017] In some embodiments, the single battery further comprises a tape attached to the insulation film and covering the gap.

[0018] In some embodiments, the side plate is hot-melt connected to the insulation film and is formed with a connection mark.

[0019] In some embodiments, the side plate is formed with a plurality of connection marks, and the plurality of connection marks are arranged at intervals in the length direction of the single battery.

[0020] In some embodiments, the side plate is provided with a plurality of first holes, and the insulation film is provided with a plurality of second holes, the first holes being oppositely arranged with the second holes.

[0021] Correspondingly, the battery pack according to the embodiments of the present application comprises the single battery described above.

[0022] Correspondingly, the power consumption device according to the embodiments of the present application comprises the single battery described above, or comprises the battery pack described above.

[0023] Beneficial effects: When the single battery according to the embodiments of the present application is assembled into a shell, the electrode assembly part is first pushed into the shell, then the side plate is clamped by a traction tool and pulled into the shell, the movement of the electrode assembly is guided by the pulling force, so that the electrode assembly can stabilize its relative position under the cooperation of the pushing force and the pulling force, reducing the possibility of deviation of the electrode assembly, so that the insulation film can maintain the distance with the inner wall, reducing the possibility of wrinkle, and thus improving the process yield; since the side plate is connected with the first cover plate assembly and the insulation film respectively, when the insulation film generates a wrinkle trend opposite to its moving direction under the action of friction force, the side plate plays a supporting role for the insulation film, so that the insulation film remains flat.

[0024] The battery pack according to the embodiments of the present application comprises the single battery described above, and thus can have all the technical features and beneficial effects of the single battery described above.

[0025] The power consumption device according to the embodiments of the present application comprises the single battery described above or the battery pack described above, and thus can have all the technical features and technical effects of the single battery or the battery pack described above. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0027] Figure 1 The exploded view of the single battery provided in the embodiments of the present application is shown in the figure.

[0028] Figure 2 The exploded view of the single battery provided in the embodiments of the present application is shown in the figure.

[0029] Figure 3 The schematic view of the side plate before cutting provided in the embodiments of the present application is shown in the figure.

[0030] Figure 4 The schematic view of the relative position of the side plate and the insulating film provided in the embodiments of the present application is shown in the figure.

[0031] Figure 5 The schematic view of the adhesive tape provided in the embodiments of the present application is shown in the figure.

[0032] The figure shows the following: 1, the shell; 11, the first opening; 12, the second opening; 13, the inner cavity; 2, the first cover plate assembly; 21, the first plate body; 22, the plastic part; 3, the second cover plate assembly; 4, the electrode assembly; 5, the insulating film; 51, the notch; 52, the second hole; 6, the side plate; 60, the connection mark; 61, the first hole; 7, the adhesive tape. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort also belong to the protection scope of the present application.

[0034] In the description of the present application, it should be understood that the terms "height", "thickness", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, at least one of which can be one, two or more, unless otherwise specifically limited. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical, for example, within an angle range of 85°-95°.

[0035] It should be noted that in the drawings of the embodiments of the present application, the arrow marked X represents the length direction X of the single battery, the arrow marked Y represents the width direction Y of the single battery, and the arrow marked Z represents the thickness direction Z of the single battery. The length direction X, the width direction Y and the thickness direction Z are introduced to more clearly describe the structure and relative positional relationship of the components in the single battery. In actual application, the height direction X may change according to the different placement modes of the single battery.

[0036] Please refer to Figure 1 and Figure 2 The single battery of the embodiments of the present application includes a shell 1, a first cover plate assembly 2, a second cover plate assembly 3, an electrode assembly 4, an insulating film 5 and a side plate 6. The shell 1 has a first opening 11, a second opening 12 and an inner cavity 13 arranged between the first opening 11 and the second opening 12, and the inner cavity 13 communicates with the first opening 11 and the second opening 12. The first cover plate assembly 2 is arranged on the first opening 11 to seal the first opening 11, and the second cover plate assembly 3 is arranged on the second opening 12 to seal the second opening 12. The first cover plate assembly 2 and the second cover plate assembly 3 jointly seal the inner cavity 13, so that the inside of the single battery can be isolated from the external environment, thereby ensuring the electrical safety of the inside of the single battery. The electrode assembly 4 is arranged in the inner cavity 13, and the electrode assembly 4 includes an electrode body formed by winding the electrode sheet and the separator arranged in layers. The insulating film 5 is wrapped around the periphery of the electrode assembly 4, and the insulating film 5 isolates the electrode body from the shell 1, thereby playing the role of insulation, protection and support for the periphery of the electrode body. The side plate 6 is arranged in the inner cavity 13, and the side plate 6 is connected with the first cover plate assembly 2 and the insulating film 5 respectively. The side plate 6 extends from the first cover plate assembly 2 to the second opening 12, and the side plate 6 is made of insulating material to maintain electrical insulation between the side plate 6 and the electrode assembly 4, so as to prevent the electrode assembly 4 from short-circuiting.

[0037] When assembling, one end of the electrode assembly 4 is pushed into the shell 1 through the first opening 11, the side plate 6 is clamped by a pulling tool away from one end of the first cover plate assembly 2, and a pulling force is applied to the side plate 6, so that the electrode assembly 4 is moved into the shell 1 in a push-pull manner. Compared with pushing the electrode assembly 4 into the shell 1 by applying a pushing force on one side, the push-pull manner can make the electrode assembly 4 bear uniform force, control the speed and direction of the electrode assembly 4, reduce the possibility of deflection or inclination of the electrode assembly 4 during the shell entering process, thereby maintaining the shell entering posture of the electrode assembly 4, keeping the spacing between the insulating film 5 and the inner wall of the shell 1, reducing the possibility of wrinkle generation, and further improving the process yield.

[0038] Please refer to Figures 1 to 4 The monomer battery has a length direction X corresponding from the first cover plate assembly 2 to the second cover plate assembly 3. In order to facilitate pulling the side plate 6, the side plate 6 can be extended to the outside of the insulating film 5 along the length direction X, that is, the part of the side plate 6 corresponding to the second opening 12 protrudes from the insulating film 5 along the length direction X. When entering the shell, the part of the side plate 6 protruding from the insulating film 5 along the length direction X is clamped by the pulling tool. After the shell entering is completed, the part of the side plate 6 is cut off or folded and placed into the shell 1.

[0039] Please refer to Figure 1 and Figure 2 In some embodiments, the insulating film 5 covers the outside of the side plate 6, that is, the side plate 6 is located between the insulating film 5 and the electrode assembly 4. The side plate 6 is connected with the insulating film 5 on one side and is covered by the insulating film 5 on the other side, which reduces the possibility of separation between the side plate 6 and the insulating film 5, so that the side plate 6 can bear relatively larger pulling force load. In some other embodiments, the insulating film 5 is arranged between the side plate 6 and the electrode assembly 4, that is, the side plate 6 is located outside the insulating film 5. At this time, the side plate 6 can play a clamping role on the insulating film 5, so that the insulating film 5 is attached to the surface of the electrode assembly 4. At the same time, when assembling into the shell, the side plate 6 can also isolate the direct contact between part of the insulating film 5 and the inner wall of the shell 1, thereby playing a protective role on the insulating film 5.

[0040] Please refer to Figure 1 and Figure 4In some embodiments, the number of side plates 6 is multiple, and at least one side plate 6 is arranged on each side of the electrode assembly 4. The multiple side plates 6 increase the supporting effect on the insulation film 5, so that the insulation film 5 can be kept flat under the friction between the insulation film 5 and the shell 1. At the same time, the multiple side plates 6 are distributed at different positions, which can disperse the pulling force during the pulling process, so as to improve the uniformity of the stress of the electrode assembly 4 and further increase the stability of the movement of the electrode assembly 4. In the embodiment, the single battery has a width direction Y and a thickness direction Z perpendicular to each other, the width direction Y is perpendicular to the length direction X, and one side plate 6 is arranged on each side of the electrode assembly 4 along the width direction Y. In the thickness direction Z, the width of the side plate 6 is not greater than the thickness of the electrode assembly 4. The side plate 6 corresponds to the position of the narrow side of the electrode assembly 4, and fully utilizes the space beside the narrow side. In some other embodiments, the multiple side plates 6 are arranged on both sides of the electrode assembly 4 along the thickness direction Z and at the middle position of the width of the electrode assembly 4.

[0041] Please refer to Figure 1 and Figure 4 In some embodiments, the first cover plate assembly 2 comprises a first plate body 21 and a plastic part 22. The first plate body 21 covers the first opening 11, and the plastic part 22 is connected to the first plate body 21 and located in the inner cavity 13. At least part of the plastic part 22 is wrapped in the insulation film 5. The insulation film 5 is provided with a notch 51 for exposing part of the plastic part 22. The side plate 6 is connected to the part of the plastic part 22 exposed from the insulation film 5. The side plate 6 and the plastic part 22 can be connected by hot melting, so that the side plate 6 is directly connected to the plastic part 22 through the notch 51, avoiding the interference of the thickness of the insulation film 5, which is beneficial to increase the stability of the connection between the side plate 6 and the plastic part 22. At the same time, since the insulation film 5 does not need to be hot-melted, the temperature required for hot-melting of the side plate 6 can be reduced, so as to protect the plastic part 22 and improve the hot-melting efficiency.

[0042] The electrode assembly 4 further comprises a tab connected to the first plate body 21 and the electrode body respectively to lead out the current generated by the electrode body. The structure of the second cover plate assembly 3 is the same as that of the first cover plate assembly 2. Correspondingly, the connection structure of the second cover plate assembly 3 with the insulation film 5 and the side plate 6 is also the same as that of the first cover plate assembly 2. There is a difference in the assembly sequence, which will not be described here.

[0043] Please refer to Figure 5 In some embodiments, the single battery further comprises a tape 7 attached to the insulation film 5 and covering the notch 51. The tape 7 covers the notch 51, which protects the connection point of the side plate 6 and the plastic part 22 inside the notch 51.

[0044] Please refer to Figure 4In some embodiments, the side plate 6 is hot melt connected with the insulating film 5, and is formed with a connection mark 60. The connection mark 60 indicates that the side plate 6 and the insulating film 5 form a close contact and connection, which can increase the strength and stability of the connection. In addition, during the quality inspection process, the connection mark 60 can be used as one of the indicators for quality control. By checking the shape, size and consistency of the connection mark 60, the quality of the connection can be evaluated, and possible problems or defects can be found in time. For example, the connection mark 60 is rectangular. The image of the connection mark 60 formed after the hot melt connection of the side plate 6 and the insulating film 5 can be obtained by an image recognition device. The image is compared with a standard sample, and size measurement and defect detection are performed. The size value and whether the mark is continuous are used for judgment.

[0045] For reference Figure 4 In some embodiments, a plurality of connection marks 60 are formed on the side plate 6, and the plurality of connection marks 60 are arranged at intervals in the length direction X of the single battery, which is perpendicular to the width direction Y and the thickness direction Z. The plurality of connection marks 60 means that the side plate 6 and the insulating film 5 are hot melt connected at multiple points, which is beneficial to increase the stability of the connection of the side plate 6 and the insulating film 5. Meanwhile, the connection marks 60 are arranged at intervals, which can reduce the influence of the hot melt temperature on each other.

[0046] For reference Figure 4 In some embodiments, a plurality of first holes 61 are provided through the side plate 6 and arranged at intervals in the length direction X. A plurality of second holes 52 are provided through the insulating film 5, and the first holes 61 and the second holes 52 are arranged opposite to each other. When hot melt connecting the side plate 6 and the insulating film 5, the relative positions of the side plate 6 and the insulating film 5 can be fixed by passing the positioning convex structure through the first hole 61 and the second hole 52, which facilitates the subsequent hot melt connection, thereby improving the position accuracy and quality of the connection.

[0047] Correspondingly, the battery pack provided by the embodiments of the present application includes the single battery of the above-mentioned embodiments, and therefore can have all the technical features and beneficial effects of the single battery, which will not be described herein again.

[0048] Correspondingly, the power consumption equipment provided by the embodiments of the present application can be a computer, an energy storage power supply device or various types of equipment. It can be understood that the power consumption equipment includes the single battery of the above-mentioned embodiments, or includes the battery pack of the above-mentioned embodiments, and therefore can have all the technical features and technical effects of the single battery or the battery pack, which will not be described herein again.

[0049] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0050] The single battery provided by the embodiments of the present application is described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment descriptions are only used to help understand the technical solutions of the present application and the core ideas thereof. Those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell, characterized by, The single battery comprises: a housing (1) having a first opening (11), a second opening (12), and an inner cavity (13) arranged between the first opening (11) and the second opening (12); a first cover plate assembly (2) covering the first opening (11); a second cover plate assembly (3) covering the second opening (12); an electrode assembly (4) arranged in the inner cavity (13); an insulation film (5) covering a side of the electrode assembly (4); a side plate (6) arranged in the inner cavity (13), the side plate (6) being connected with the first cover plate assembly (2) and the insulation film (5) respectively, and the side plate (6) extending from the first cover plate assembly (2) to the second opening (12).

2. The cell according to claim 1, wherein The insulation film (5) covers an outer side of the side plate (6). Alternatively, the insulation film (5) is arranged between the side plate (6) and the electrode assembly (4).

3. The cell according to claim 1, wherein A plurality of side plates (6) are arranged on both sides of the electrode assembly (4).

4. The cell according to claim 1, wherein The first cover plate assembly (2) comprises: a first plate body (21) covering the first opening (11); a plastic part (22) connected to the first plate body (21), the plastic part (22) being located in the inner cavity (13) and at least partially wrapped in the insulation film (5), the insulation film (5) being provided with a notch (51) for exposing part of the plastic part (22), and the side plate (6) being connected with the part of the plastic part (22) exposed from the insulation film (5).

5. The cell according to claim 4, wherein The single battery further comprises a tape (7) attached to the insulation film (5) and covering the notch (51).

6. The cell according to claim 1, wherein The side plate (6) is hot-melt connected with the insulation film (5) and forms a connection mark (60).

7. The cell according to claim 6, wherein The side plate (6) forms a plurality of connection marks (60), and the plurality of connection marks (60) are arranged at intervals in a length direction of the single battery.

8. The cell according to claim 1, wherein The side plate (6) is provided with a plurality of first holes (61), and the insulation film (5) is provided with a plurality of second holes (52), the first holes (61) and the second holes (52) being arranged oppositely.

9. A battery pack, characterized by, The battery pack comprises the single battery according to any one of claims 1 to 8.

10. An electric device, characterized by The battery pack comprises the single battery according to any one of claims 1 to 8, or the battery pack according to claim 9.

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