Battery and battery module

Abstract

The utility model relates to the technical field of battery structures, in particular to a battery and a battery module, the battery comprises a roll core structure and a packaging structure, the roll core structure comprises a full-tab roll core main body; the full-tab roll core main body is cylindrical; the packaging structure comprises a soft packaging film, and the soft packaging film wraps the outer side of the full-tab roll core main body, so that a shell of the battery is formed. According to the battery and the battery module provided by the embodiment of the utility model, the battery adopts a combined form of the cylindrical roll core structure, the full-tab design and the soft packaging film, the forming process of the cylindrical roll core structure is simpler and quicker, so that the production efficiency of the battery can be improved, the over-current capability of the battery can be improved through the full-tab design, and the service life of the battery is prolonged. The transmission efficiency of the battery can be improved; and moreover, the flexible packaging film is higher in flexibility and can be placed flatly to complete infiltration, so that the height of the battery can be increased directly, and the energy density of the battery is improved.

Description

Technical Field

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

[0002] Soft-pack batteries are a type of power battery. They use a soft packaging film to cover the internal winding core and electrolyte to form the overall structure of the battery. Soft-pack batteries have the advantages of high safety and light weight.

[0003] At present, the shape of common soft-pack batteries is generally a square structure, and the corresponding core inside the soft-pack battery is also square. The core is formed by lamination or square winding, and the pole ear is led out on one side of the core. In the prior art, the production efficiency of the square core structure is slow, which affects the production efficiency of the battery, and the core of the soft-pack battery is generally a single-pole ear structure, which will lead to poor current capacity of the battery. Utility Model Content

[0004] In order to solve at least the above technical problems existing in the prior art, an embodiment of the utility model provides a battery and a battery module.

[0005] One aspect of an embodiment of the utility model provides a battery, including a core structure and a packaging structure; the core structure includes a full-tab core body, and the full-tab core body is cylindrical; the packaging structure includes a soft packaging film, and the soft packaging film covers the outer side of the full-tab core body to form the outer shell of the battery.

[0006] In some embodiments, the full-tab winding core body includes a positive electrode sheet, a negative electrode sheet and a separator; a current collector with a set height is provided on the long side of the positive electrode sheet and the negative electrode sheet, and the current collector is synchronously wound with the positive electrode sheet, the negative electrode sheet and the separator, and a flattened full-tab structure is formed at the end of the full-tab winding core body.

[0007] In some embodiments, the full-tab winding core body includes a positive electrode sheet, a negative electrode sheet and a separator; a current collector with a set height is provided on the long sides of the positive electrode sheet and the negative electrode sheet, and the current collector is divided into a plurality of sub-current collectors, and the plurality of sub-current collectors are synchronously wound with the positive electrode sheet, the negative electrode sheet and the separator, and a cut-and-stacked full-tab structure is formed at the end of the full-tab winding core body.

[0008] In some embodiments, the flexible packaging film includes a cylindrical packaging body, and the full-tab core body is located inside the packaging body; the port of the packaging body includes a heat-sealing interface structure, and the full-tab core body is sealed inside the packaging body through the heat-sealing interface structure.

[0009] In some embodiments, the packaging body includes a group of buckled edges arranged along the axial direction of the packaging body; after the full-tab winding core body is placed in the packaging body, the buckled edges are sealed and connected.

[0010] In some embodiments, the packaging body includes two sets of buckled edges arranged axially along the packaging body, so that the packaging body is a split structure; after the full-tab core body is placed in the packaging body, the buckled edges located on the same side are sealed and connected.

[0011] In some embodiments, the packaging body is connected to a buffer bag for buffering gas.

[0012] Another aspect of the utility model provides a battery module, comprising a plurality of connected batteries as mentioned above.

[0013] A battery and a battery module provided by an embodiment of the utility model, wherein the battery adopts a combination of a cylindrical core structure, a full-ear design and a soft packaging film, wherein the molding process of the cylindrical core structure is simpler and faster, thereby improving the production efficiency of the battery, and the full-ear design can improve the battery's current capacity and the battery's transmission efficiency; and the soft packaging film has higher flexibility and can be placed flat to complete the impregnation, thereby increasing the height and width of the battery and improving the battery's energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] By reading the detailed description below with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, wherein:

[0015] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0016] Figure 1 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model;

[0017] Figure 2 The main view of the positive electrode sheet or the negative electrode sheet in the full-electrode winding core body of the battery provided by the embodiment of the utility model Figure 1 ;

[0018] Figure 3 The main view of the positive electrode sheet or the negative electrode sheet in the full-electrode winding core body of the battery provided by the embodiment of the utility model Figure 2 ;

[0019] Figure 4 The structure of the flexible packaging film of the battery provided by the embodiment of the utility model is schematically shown. Figure 1 ;

[0020] Figure 5 The structure of the flexible packaging film of the battery provided by the embodiment of the utility model is schematically shown. Figure 2 .

[0021] In the figure:

[0022] 10: core structure; 20: packaging structure;

[0023] 11: full-electrode winding core body; 111: positive electrode sheet; 112: negative electrode sheet; 113: current collector; 114: sub-current collector;

[0024] 21: flexible packaging film; 211: packaging body; 212: heat-sealed interface structure; 213: buckled edge. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] An embodiment of the utility model provides a battery and a battery module, wherein the battery includes a roll core structure and a packaging structure; wherein the roll core structure is cylindrical in shape, that is, formed by a circular winding method, and a full-ear structure is provided on the cylindrical roll core structure; the packaging structure is a soft packaging film, which is coated on the outer side of the roll core structure to serve as a battery shell.

[0027] The following is a detailed description of the various structures of the battery and the battery module provided by the embodiments of the present invention, as well as the positional relationship and connection relationship between the various structures, in conjunction with the accompanying drawings.

[0028] like Figures 1 to 5 As shown, the full-ear core body 11 is cylindrical, and the full-ear core body 11 includes a positive electrode sheet 11, a negative electrode sheet 112 and a diaphragm. When the cylindrical core is produced, the diaphragm is located between the positive electrode sheet 11 and the negative electrode sheet 112 to play an isolation role. The three are wound together to form a cylindrical core structure 10 by rotating the winding needle; wherein, the production efficiency of the cylindrical core manufacturing process is higher than that of the square core structure.

[0029] like Figure 2 As shown, in the embodiment of the utility model, a current collector 113 with a set height is provided on the long sides of the positive electrode sheet 11 and the negative electrode sheet 112. The current collector 113 is synchronously wound with the positive electrode sheet 11, the negative electrode sheet 112 and the separator, and a flattened full-electrode ear structure is formed at the end of the full-electrode ear winding core body 11.

[0030] The form of the current collector 113 in the positive electrode sheet 11 and the negative electrode sheet 112 is determined according to the full-ear molding method. For example, when the molded core structure 10 is processed by flattening, the current collector 113 can be cut to a reasonable height. After the winding operation of the core structure 10 is completed, the current collector 113 is molded using a flattening mechanism.

[0031] like Figure 3 As shown, in the embodiment of the utility model, a current collector 113 with a set height is provided on the long side of the positive electrode sheet 11 and the negative electrode sheet 112, and the current collector 113 is divided into a plurality of sub-current collectors 114, and the plurality of sub-current collectors 114 are synchronously wound with the positive electrode sheet 11, the negative electrode sheet 112 and the separator, and a cut-and-stacked full-electrode lug structure is formed at the end of the full-electrode lug winding core body 11.

[0032] When the formed core structure 10 is processed by cutting and stacking, the current collector 113 is cut to a reasonable height and then evenly divided into a plurality of sub-current collectors 114. After the winding operation of the core structure 10 is completed, the current collector 113 is formed by using a cutting and stacking mechanism.

[0033] A full-ear structure is formed at the end of the cylindrical winding core structure 10. When the battery is formed, the full-ear structure is connected to the external ear. The battery adopts a full-ear structure, so that the battery has a higher current capacity, which can improve the transmission efficiency of the battery and meet the use requirements of higher power equipment.

[0034] For example, when the battery is applied to the field of electric vehicles, the battery can improve the high performance requirements of electric vehicles and have a faster charging efficiency, thereby shortening the charging time of electric vehicles.

[0035] In the embodiment of the utility model, the packaging structure 20 includes a soft packaging film 21, and the soft packaging film 21 covers the outer side of the full-ear core body 11, thereby forming the outer shell of the battery. Among them, the soft packaging film 21 includes a cylindrical packaging body 211, and the full-ear core body 11 is located in the packaging body 211. Then, the port of the packaging body 211 can be packaged, wherein the packaging operation can adopt a heating packaging method, that is, the port part of the packaging body 211 is superimposed together, and then the part is heated so that the port part of the packaging body 211 is melted together, and the port of the packaging body 211 includes a heat-sealed interface structure 212, thereby forming a sealing structure.

[0036] During the sealing process, a port is reserved through which the electrolyte is injected. After the electrolyte is injected, the reserved port is heated and sealed to form a fully sealed structure to ensure battery performance.

[0037] In an embodiment of the utility model, the packaging body 211 is connected to a cache bag for caching gas. After the electrolyte is injected, the flexible packaging film 21 can reserve a gas cache bag according to the battery characteristics, which is used for exhausting gas during the battery charging and discharging process. After the battery completes the exhaust operation, the cache bag is removed, and finally, the exhaust port on the packaging body 211 is heat-sealed.

[0038] In the embodiment of the utility model, the packaging body 211 of the flexible packaging film 21 can be an integral cylindrical structure, or a buckle edge 213 is provided on the packaging body 211, for example, Figure 4 As shown, a set of buckle edges 213 are provided on the packaging body 211. After the full-tab winding core body 11 is placed in the packaging body 211, the buckle edges 213 are sealed and connected; or, for example, as Figure 5 As shown, the packaging body 211 includes two sets of buckled edges 213 arranged axially along the packaging body 211, so that the packaging body 211 is a split structure, for example, the two splits are symmetrical structures; after the full-ear roll core body 11 is placed in the packaging body 211, the buckled edges 213 located on the same side are sealed and connected.

[0039] After the packaging body 211 of the soft packaging film 21 is provided with the buckled edge 213, it is convenient to wrap the entire pole ear core body 11, and the overall packaging body 211 (without the buckled edge 213) has better sealing and fewer seals, which is beneficial to the sealing of the soft packaging film 21. Therefore, the structure of the packaging body 211 of the soft packaging film 21 can be selected according to actual usage requirements.

[0040] The embodiment of the utility model also provides a battery module, including a plurality of connected batteries as described above. A plurality of batteries are connected in series or in parallel to form a battery module. In the battery module, the battery adopts a combination of a cylindrical core structure 10, a full-ear design and a flexible packaging film 21, wherein the molding process of the cylindrical core structure 10 is simpler and faster, thereby improving the production efficiency of the battery, and the full-ear design can improve the battery's current capacity and the transmission efficiency of the battery; and the flexible packaging film 21 is more flexible and can be placed flat to complete the infiltration, thereby increasing the height and direction of the battery and improving the battery energy density.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. 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 different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0042] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one 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.

[0043] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery, characterized in that: It comprises a roll core structure (10) and a packaging structure (20); The winding core structure (10) comprises a full-tab winding core body (11), and the full-tab winding core body (11) is cylindrical; The packaging structure (20) comprises a soft packaging film (21), and the soft packaging film (21) covers the outer side of the full-tab winding core body (11), thereby forming the outer shell of the battery.

2. The battery according to claim 1, characterized in that The full-electrode-tab winding core body (11) comprises a positive electrode sheet (111), a negative electrode sheet (112) and a separator; A current collector (113) with a set height is provided on the long sides of the positive electrode sheet (111) and the negative electrode sheet (112); the current collector (113) is synchronously wound with the positive electrode sheet (111), the negative electrode sheet (112) and the separator, and a flattened full-electrode lug structure is formed at the end of the full-electrode lug winding core body (11).

3. The battery according to claim 1, characterized in that The full-electrode-tab winding core body (11) comprises a positive electrode sheet (111), a negative electrode sheet (112) and a separator; A current collector (113) with a set height is provided on the long sides of the positive electrode sheet (111) and the negative electrode sheet (112), and the current collector (113) is divided into a plurality of sub-current collectors (114). The plurality of sub-current collectors (114) are synchronously wound with the positive electrode sheet (111), the negative electrode sheet (112) and the separator, and a cut-and-stack full-electrode lug structure is formed at the end of the full-electrode lug winding core body (11).

4. The battery according to claim 1, characterized in that The flexible packaging film (21) comprises a cylindrical packaging body (211), and the full-tab winding core body (11) is located inside the packaging body (211); The port of the packaging body (211) comprises a heat-sealing interface structure (212), and the full-tab winding core body (11) is sealed in the packaging body (211) through the heat-sealing interface structure (212).

5. The battery according to claim 4, characterized in that The packaging body (211) comprises a group of buckled edges (213) arranged along the axial direction of the packaging body (211); After the full-tab winding core body (11) is placed in the packaging body (211), the buckled edges (213) are sealed and connected.

6. The battery according to claim 4, characterized in that The packaging body (211) comprises two groups of buckled edges (213) arranged along the axial direction of the packaging body (211), so that the packaging body (211) is a split structure; After the full-tab winding core body (11) is placed in the packaging body (211), the buckled edges (213) located on the same side are sealed and connected.

7. The battery according to claim 4, characterized in that The packaging body (211) is connected to a buffer bag for buffering gas.

8. A battery module, characterized in that: A battery comprising a plurality of connected batteries as claimed in any one of claims 1 to 7.

Images