Battery structure

Abstract

The utility model provides a battery structure which comprises a battery cell and an insulation assembly, the insulation assembly covers the peripheral side of the battery cell, the insulation assembly comprises an insulation film and an insulation spacer, the insulation film is provided with a containing cavity, and the battery cell is located in the containing cavity; the insulating spacer covers a cavity opening of the accommodating cavity, the outer periphery of the insulating spacer is provided with an assembly bulge, and the assembly bulge protrudes towards one side of the accommodating cavity; wherein an assembly gap is formed between at least part of the outer circumferential surface of the battery cell and at least part of the inner circumferential surface of the insulating film, and the assembly bulge is embedded in the assembly gap and is connected with the insulating film. According to the utility model, the problem that the insulating film and the insulating spacer of a battery product in the prior art have a poor protection effect on the naked battery cell is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, and particularly to a battery structure. Background Art

[0002] In existing battery products, the insulating gasket and the bare battery cell are only positioned by a welding tooling during the assembly process. If mechanical fluctuations or other influences occur during the production process, it is easy to cause the insulating gasket and the adapter plate connected thereto to be displaced, resulting in difficulties in the subsequent process of inserting the battery cell into the shell.

[0003] In addition, in previous battery products, the insulating film outside the bare battery cell was usually heat-melted with the boss of the plastic part under the top cover. With the development of batteries, the distance between the bare battery cell and the top cover has been further reduced, and the plastic boss under the top cover cannot meet the heat-melting requirements, resulting in that some existing battery products can only adopt a fixing method without heat-melting for the insulating film, and the insulating film in this way has a poor protection effect on the bare battery cell.

[0004] At the same time, the plastic boss under the existing product top cover is generally narrow, and it still poses a great challenge in welding and pressing. In addition, the narrow laser weld seam is likely to result in a low post-welding peel force in the subsequent process, and cannot effectively protect the bare battery cell.

[0005] Therefore, there is an urgent need for a battery product in which the insulating gasket and the insulating film can effectively protect the bare battery cell. Summary of the Utility Model

[0006] The main purpose of the utility model is to provide a battery structure to solve the problem that the insulating film and the insulating gasket of the existing battery products have poor protection effects on the bare battery cell.

[0007] To achieve the above purpose, the utility model provides a battery structure, including a battery cell and an insulating component. The insulating component covers the outer peripheral side of the battery cell. The insulating component includes an insulating film and an insulating gasket. The insulating film has a receiving cavity, and the battery cell is located in the receiving cavity. The insulating gasket covers the opening of the receiving cavity. The outer peripheral edge of the insulating gasket has an assembly protrusion, and the assembly protrusion protrudes toward the side of the receiving cavity. Wherein, an assembly gap is formed between at least a part of the outer peripheral surface of the battery cell and at least a part of the inner peripheral surface of the insulating film, and the assembly protrusion is embedded at the assembly gap and connected to the insulating film.

[0008] Further, the assembly protrusion is welded and connected to the insulating film.

[0009] Further, the assembly protrusion is a continuous one around the outer peripheral edge of the insulating gasket; or, the assembly protrusions are multiple ones spaced apart around the outer peripheral edge of the insulating gasket.

[0010] Further, one side of the assembly protrusion facing the insulating film has a first assembly surface, and one side of the insulating film facing the assembly protrusion has a second assembly surface, and the first assembly surface is welded to the second assembly surface.

[0011] Further, in the direction from the bottom surface to the opening of the accommodation cavity, the following is satisfied between the first height H1 of the insulating film and the second height H2 of the assembly protrusion: 3 mm < H2 < H1.

[0012] Further, the surface of the assembly protrusion facing the battery cell is adapted to the outer peripheral surface of the battery cell at the assembly gap; and / or, the surface of the assembly protrusion facing the insulating film is adapted to the inner peripheral surface of the insulating film at the assembly gap.

[0013] Further, one end of the assembly protrusion away from the insulating gasket has an inclined guiding surface facing the battery cell side, and in the direction from the opening to the bottom surface of the accommodation cavity, the inclined guiding surface extends obliquely in the direction away from the battery cell.

[0014] Further, the insulating gasket is square, and the assembly protrusions are multiple and arranged at intervals around the outer peripheral edge of the insulating gasket. Among them, the multiple assembly protrusions are arranged at intervals around the straight edge segments of the outer peripheral edge of the insulating gasket, and the assembly protrusions are strip-shaped; and / or, the multiple assembly protrusions are arranged at intervals around the four corners of the outer peripheral edge of the insulating gasket, and the assembly protrusions are L-shaped bent.

[0015] Further, there are four assembly protrusions, and the four assembly protrusions are correspondingly arranged at the four corners of the outer peripheral edge of the insulating gasket. Each assembly protrusion is L-shaped bent, and the first surface of the assembly protrusion facing the battery cell side is an arc surface, and the second surface of the assembly protrusion facing the insulating film side is an arc surface.

[0016] Further, a partial surface of a second circle with a second radius of R2 forms the second surface. The battery structure further includes a housing, and the housing has an accommodation cavity for accommodating the battery cell wrapped with the insulating component. The following is satisfied between the fourth radius R4 of the rounded corners at the four corners of the housing and the second radius R2: R2 > R4.

[0017] Applying the technical solution of the present utility model, by providing assembly protrusions on the outer peripheral edge of the insulating gasket, and at the same time, the assembly protrusions protrude towards the accommodating cavity side. In addition, an assembly gap is formed between at least part of the outer peripheral surface of the battery cell and at least part of the inner peripheral surface of the insulating film. The assembly protrusions are embedded at the assembly gap and connected to the insulating film. By connecting the assembly protrusions to the insulating film, the connection reliability between the two is ensured, thereby ensuring the effective protection of the insulating gasket and the insulating film for the battery cell. The setting of the assembly protrusions achieves the purpose of hard positioning of the assembly protrusions and the battery cell, ensures the stability of the insulating gasket during the assembly process, and can also ensure that the adapter plate fixed on the insulating gasket is not easily offset after connection, seriously affecting the subsequent assembly process. In addition, the setting of the assembly protrusions can also limit the battery cell to prevent the battery cell from shaking during the assembly or transportation process.

[0018] Furthermore, with the setting of the assembly protrusions, the connection position of the insulating film is transferred from the plastic part below the top cover to the assembly protrusions of the insulating gasket, which can achieve better connection and pressing, and at the same time has a wider laser welding seam, which is beneficial to achieving a higher post-welding peel force and playing a stable protective role for the battery cell.

[0019] Furthermore, with the setting of the assembly protrusions, the connection position of the insulating film is transferred from the plastic part below the top cover to the assembly protrusions of the insulating gasket, thereby allowing the distance between the upper surface of the top space of the battery cell and the top cover to be further reduced, which is beneficial to ensuring the overall structural compactness of the battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The schematic diagrams in the specification that form a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0021] Figure 1 Shows an exploded structural schematic diagram of a battery structure according to an optional embodiment of the present utility model;

[0022] Figure 2 Shows Figure 1 An enlarged structural schematic diagram of part A in

[0023] Figure 3 Shows Figure 1 A structural schematic diagram of the insulating gasket of the battery structure in

[0024] Figure 4 Shows Figure 3 A structural schematic diagram of one side of the assembly protrusion of the insulating gasket in

[0025] Figure 5 Shows Figure 4Schematic diagram of the enlarged structure at position B in

[0026] Figure 6 shows Figure 1 Schematic diagram of the structure where an assembly gap is formed between the battery cell and the insulating film in

[0027] Figure 7 shows Figure 1 Schematic diagram of the sectional structure of the battery structure before disassembly in

[0028] Among them, the above-mentioned drawings include the following reference numerals:

[0029] 10. Battery cell;

[0030] 20. Insulating film; 21. Accommodating cavity;

[0031] 30. Insulating gasket; 31. Assembly protrusion; 311. Inclined guiding surface;

[0032] 100. Assembly gap. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] To solve the problem that the insulating film and the insulating gasket of the existing battery products have poor protection effects on the bare battery cell, the present invention provides a battery structure.

[0035] As Figures 1 to 7 shown, the battery structure includes a battery cell 10 and an insulating assembly. The insulating assembly covers the outer peripheral side of the battery cell 10. The insulating assembly includes an insulating film 20 and an insulating gasket 30. The insulating film 20 has an accommodating cavity 21, and the battery cell 10 is located in the accommodating cavity 21; the insulating gasket 30 covers the cavity opening of the accommodating cavity 21. The outer peripheral edge of the insulating gasket 30 has an assembly protrusion 31, and the assembly protrusion 31 protrudes toward the accommodating cavity 21; among them, an assembly gap 100 is formed between at least a part of the outer peripheral surface of the battery cell 10 and at least a part of the inner peripheral surface of the insulating film 20, and the assembly protrusion 31 is embedded at the assembly gap 100 and is connected to the insulating film 20.

[0036] Applying the technical solution of the present utility model, by providing an assembly protrusion 31 on the outer peripheral edge of the insulating gasket 30. At the same time, the assembly protrusion 31 protrudes towards the accommodating cavity 21. In addition, an assembly gap 100 is formed between at least a part of the outer peripheral surface of the battery cell 10 and at least a part of the inner peripheral surface of the insulating film 20. The assembly protrusion 31 is embedded at the assembly gap 100 and connected to the insulating film 20. By connecting the assembly protrusion 31 to the insulating film 20, the connection reliability between the two is ensured, thereby ensuring the effective protection of the insulating gasket 30 and the insulating film 20 on the battery cell 10. The setting of the assembly protrusion 31 achieves the purpose of hard positioning of the assembly protrusion 31 and the battery cell 10, ensuring the stability of the insulating gasket 30 during the assembly process, and also ensuring that the adapter plate fixed on the insulating gasket 30 is not prone to offset after connection, seriously affecting the subsequent assembly process; in addition, the setting of the assembly protrusion 31 can also limit the battery cell 10 to prevent the battery cell 10 from shaking during the assembly or transportation process.

[0037] Furthermore, the setting of the assembly protrusion 31 transfers the connection position of the insulating film 20 from the plastic part below the top cover to the assembly protrusion 31 of the insulating gasket 30, which can achieve better connection and press-fitting, and at the same time has a wider laser weld seam, which is beneficial to achieving a higher post-weld peel force and playing a stable protective role for the battery cell 10.

[0038] Furthermore, the setting of the assembly protrusion 31 transfers the connection position of the insulating film 20 from the plastic part below the top cover to the assembly protrusion 31 of the insulating gasket 30, thereby allowing the top space of the battery cell 10, that is, the distance between the upper surface of the battery cell 10 and the top cover to be further reduced, which is beneficial to ensuring the overall structural compactness of the battery structure.

[0039] Preferably, the assembly protrusion 31 is welded to the insulating film 20. Transferring the laser welding position of the insulating film 20 from the plastic part below the top cover to the assembly protrusion 31 of the insulating gasket 30 can achieve better welding and press-fitting, and at the same time has a wider laser weld seam, which is beneficial to achieving a higher post-weld peel force and playing a stable protective role for the battery cell 10; in addition, allowing the top space of the battery cell 10, that is, the distance between the upper surface of the battery cell 10 and the top cover to be further reduced, is beneficial to ensuring the overall structural compactness of the battery structure.

[0040] It should be noted that in an embodiment not shown in the present application, the assembly protrusion 31 is a continuous one around the outer peripheral edge of the insulating gasket 30.

[0041] Of course, in the present application, the assembly protrusion 31 can also be a plurality of spaced-apart ones around the outer peripheral edge of the insulating gasket 30.

[0042] It should be noted that in this application, the side of the assembly protrusion 31 facing the insulating film 20 has a first assembly surface, and the side of the insulating film 20 facing the assembly protrusion 31 has a second assembly surface, and the first assembly surface and the second assembly surface are connected by welding. In this way, the connection reliability and stability between the assembly protrusion 31 and the insulating film 20 are ensured.

[0043] Optionally, in the direction from the cavity bottom surface to the cavity opening of the accommodation cavity 21, the following relationship is satisfied between the first height H1 of the insulating film 20 and the second height H2 of the assembly protrusion 31: 3 mm < H2 < H1. In this way, by reasonably optimizing the relationship between the first height H1 and the second height H2 of the assembly protrusion 31, it is ensured that the second height H2 of the assembly protrusion 31 can be within a reasonable range, ensuring that the assembly protrusion 31 has a sufficient first assembly surface, thereby ensuring the welding reliability between the first assembly surface and the second assembly surface.

[0044] Optionally, the surface of the assembly protrusion 31 facing the battery cell 10 is adapted to the outer peripheral surface of the battery cell 10 at the assembly gap 100; and / or, the surface of the assembly protrusion 31 facing the insulating film 20 is adapted to the inner peripheral surface of the insulating film 20 at the assembly gap 100. In this way, the positioning reliability of the assembly protrusion 31 for the battery cell 10 is ensured, and the fitting reliability between the first welding surface and the second welding surface between the assembly protrusion 31 and the insulating film 20 is ensured.

[0045] As Figure 1 and Figure 2 As shown, one end of the assembly protrusion 31 away from the insulating gasket 30 has an inclined guiding surface 311, and the inclined guiding surface 311 faces the side of the battery cell 10, and in the direction from the cavity opening to the cavity bottom surface of the accommodation cavity 21, the inclined guiding surface 311 extends obliquely in the direction away from the battery cell 10. In this way, when the insulating gasket 30 and the battery cell 10 are assembled and fitted, the setting of the inclined guiding surface 311 plays a guiding role.

[0046] It should be noted that in this application, the insulating gasket 30 is square, and the assembly protrusions 31 are multiple and are arranged at intervals around the outer peripheral edge of the insulating gasket 30. Among them, the multiple assembly protrusions 31 are arranged at intervals around the straight edge segments of the outer peripheral edge of the insulating gasket 30, and the assembly protrusions 31 are strip-shaped; and / or, the multiple assembly protrusions 31 are arranged at intervals around the four corners of the outer peripheral edge of the insulating gasket 30, and the assembly protrusions 31 are in an L-shaped bent shape.

[0047] Specifically, as Figures 1 to 7As shown, there are four assembly protrusions 31, and the four assembly protrusions 31 are correspondingly arranged at the four corners of the outer peripheral edge of the insulating gasket 30. Each assembly protrusion 31 is in an L-shaped bent shape, and the first surface of the assembly protrusion 31 facing the battery cell 10 is an arc surface, and the second surface of the assembly protrusion 31 facing the insulating film 20 is an arc surface. In this way, it is ensured that the first surface of the assembly protrusion 31 is as adapted as possible to a part of the outer peripheral surface of the wound core, and it is ensured that the second surface can be as adapted as possible to a part of the outer peripheral surface of the insulating film 20.

[0048] It should be noted that in an embodiment not shown in the present application, a part of the surface of the second circle with the second radius R2 forms the second surface. The battery structure further includes a housing, the housing has a receiving cavity, and the receiving cavity is used to receive the battery cell 10 wrapped with the insulating component. The fourth radius R4 of the rounded corners at the four corners of the housing and the second radius R2 satisfy: R2 > R4. In this way, by setting the four corners of the housing into a rounded corner structure, the assembly convenience between the battery cell 10 wrapped with the insulating component and the housing is ensured.

[0049] Preferably, the housing is an aluminum shell.

[0050] As Figure 4 and Figure 5 As shown, the thickness in the middle of the L-shaped bent assembly protrusion 31 is greater than the thickness on both sides. In this way, while ensuring that the first surface of the assembly protrusion 31 is as adapted as possible to a part of the outer peripheral surface of the wound core and ensuring that the second surface can be as adapted as possible to a part of the outer peripheral surface of the insulating film 20, the assembly gap 100 formed between at least a part of the outer peripheral surface of the battery cell 10 and at least a part of the inner peripheral surface of the insulating film 20 can be fully utilized.

[0051] It should be noted that in the present application, when the assembly protrusion 31 is located at the straight edge section of the outer peripheral edge of the insulating gasket 30 and the assembly protrusion 31 is strip-shaped, the shape of the assembly protrusion 31 can be square, trapezoidal, or quasi-trapezoidal.

[0052] Optionally, the insulating film 20 is a plastic insulating film with a thickness of about 0.1 mm.

[0053] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0055] For the sake of convenience of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used here to describe the spatial positional relationship of a device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0056] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] It should be noted that the terms "first", "second", etc. in the specification, claims, and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here.

[0058] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery structure, characterized in that: include: Battery cell (10); An insulating component, the insulating component cover is arranged on the outer peripheral side of the battery core (10), and the insulating component comprises: An insulating film (20), the insulating film (20) having a containing cavity (21), the battery cell (10) being located in the containing cavity (21); An insulating gasket (30), the insulating gasket (30) being arranged to cover the cavity opening of the accommodating cavity (21), the outer periphery of the insulating gasket (30) having an assembly protrusion (31), the assembly protrusion (31) being arranged to protrude toward one side of the accommodating cavity (21); An assembly gap (100) is formed between at least a portion of the outer circumference of the battery cell (10) and at least a portion of the inner circumference of the insulating film (20), and the assembly protrusion (31) is embedded in the assembly gap (100) and connected to the insulating film (20).

2. The battery structure according to claim 1, characterized in that: The assembly protrusion (31) is connected to the insulating film (20) by welding.

3. The battery structure according to claim 1, characterized in that: The assembly protrusion (31) is a continuous protrusion extending around the outer periphery of the insulating gasket (30); or, The assembly protrusions (31) are multiple and are arranged at intervals around the outer periphery of the insulating gasket (30).

4. The battery structure according to claim 1, characterized in that: The side of the assembly protrusion (31) facing the insulating film (20) has a first assembly surface, and the side of the insulating film (20) facing the assembly protrusion (31) has a second assembly surface, and the first assembly surface is welded to the second assembly surface.

5. The battery structure according to claim 1, characterized in that: In the direction from the bottom surface of the accommodating cavity (21) to the cavity opening, a first height H1 of the insulating film (20) and a second height H2 of the assembly protrusion (31) satisfy the following relationship: 3mm<H2<H1.

6. The battery structure according to claim 1, characterized in that: The surface of the assembly protrusion (31) facing the battery core (10) is matched with the outer peripheral surface of the battery core (10) at the assembly gap (100); and / or, The surface of the assembly protrusion (31) facing the insulating film (20) is matched with the inner peripheral surface of the insulating film (20) at the assembly gap (100).

7. The battery structure according to claim 1, characterized in that: The end of the assembly protrusion (31) away from the insulating gasket (30) has an inclined guide surface (311), the inclined guide surface (311) faces one side of the battery core (10), and in the direction from the cavity opening to the cavity bottom surface of the accommodating cavity (21), the inclined guide surface (311) extends obliquely in a direction away from the battery core (10).

8. The battery structure according to claim 1, characterized in that: The insulating gasket (30) is square in shape, and the assembly protrusions (31) are multiple and arranged at intervals around the outer periphery of the insulating gasket (30), wherein: A plurality of the assembly protrusions (31) are arranged at intervals around the straight edge section of the outer periphery of the insulating gasket (30), and the assembly protrusions (31) are in the shape of strips; and / or, A plurality of the assembly protrusions (31) are arranged at intervals around four corners of the outer periphery of the insulating gasket (30), and the assembly protrusions (31) are in an L-shaped bending shape.

9. The battery structure according to claim 1, characterized in that: The four assembly protrusions (31) are arranged at four corners of the outer periphery of the insulating gasket (30) respectively, each of the assembly protrusions (31) is in an L-shaped bending shape, and the first surface of the assembly protrusion (31) facing the battery cell (10) is a curved surface, and the second surface of the assembly protrusion (31) facing the insulating film (20) is a curved surface.

10. The battery structure according to claim 9, characterized in that: The second surface is formed by a partial surface of a second circle with a second radius R2, and the battery structure further comprises: A shell having a housing cavity, wherein the housing cavity is used to accommodate the battery core (10) wrapped with the insulating component, and the fourth radius R4 and the second radius R2 of the fillets at the four corners of the shell satisfy: R2>R4.

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