Insulator and secondary battery

Abstract

The utility model provides an insulating part and a secondary battery. The insulating part comprises an insulating part body, the insulating part body is bent for multiple times to form a polyhedral structure with an opening in the top, the polyhedral structure is composed of two oppositely arranged first side surfaces, two oppositely arranged second side surfaces and an insulating bottom surface, and the insulating bottom surface corresponds to the bottom surface of an electrode assembly of the secondary battery; each second side face is correspondingly provided with at least one gap adhesive tape, each gap adhesive tape comprises an adhesive area and a non-adhesive area, the adhesive areas cover the second side faces and the insulating bottom face, and at least one part of the non-adhesive areas cover the two first side faces. According to the utility model, the problem of poor use performance of an insulating part in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to an insulating component and a secondary battery. Background Technology

[0002] Currently, the electrode assembly of secondary batteries typically uses an insulating component that covers two large surfaces from the bottom up. The sides of the electrode assembly are then folded over by extensions on both sides of these large surfaces. The top of the insulating component and the plastic under the top cover are usually fixed by heat fusion. Adhesive tape is typically used to fix the movable parts at the bottom of the insulating component on both sides of the electrode assembly. However, this tape fixing method usually has the following problems: Gaps exist between the bottom surface of the insulating component and the side covering formed by the overlap of the two large surfaces. These gaps pose a risk of conductive materials inside the battery, such as carbon particles, coming into contact with the casing and causing electrochemical corrosion. When the width of the tape fixing the bottom of the insulating component is less than the width of the side of the electrode assembly, it cannot completely cover the aforementioned gaps, and the risk of electrochemical corrosion still exists on both sides of the tape. When the width of the tape fixing the bottom of the insulating component is greater than the width of the side of the electrode assembly, the excess width needs to be folded over and pasted onto the large surfaces. When the bottom and side corners are folded over onto the large surfaces, there is excess adhesive. When the electrode assembly is installed in the casing, the excess adhesive can get stuck to the edge of the casing opening, causing weld spalling on the top cover.

[0003] Therefore, existing technologies suffer from poor performance of insulating components. Utility Model Content

[0004] The main purpose of this invention is to provide an insulating component and a secondary battery to solve the problem of poor performance of insulating components in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an insulating component is provided, comprising: an insulating component body, which is formed into a polyhedral structure with an opening at the top after being bent multiple times; the polyhedral structure consists of two opposing first side surfaces, two opposing second side surfaces, and an insulating bottom surface, wherein the insulating bottom surface corresponds to the bottom surface of the electrode assembly of the secondary battery; at least two gap tapes, wherein each second side surface is provided with at least one gap tape, the gap tapes including adhesive areas and non-adhesive areas, the adhesive areas covering the second side surfaces and the insulating bottom surface, and at least a portion of the non-adhesive areas covering the two first side surfaces.

[0006] Furthermore, there are two glue-free areas, with an adhesive area located between the two glue-free areas, and the two glue-free areas are symmetrically arranged about the adhesive area.

[0007] Furthermore, the gap tape also has two first fold lines and one second fold line. At least a portion of the first fold line coincides with the connection between the first side and the second side, and at least another portion of the first fold line coincides with the connection between the first side and the insulating bottom surface. The second fold line is disposed between the two first fold lines, and the second fold line divides the adhesive area into two parts corresponding to the second side and the insulating bottom surface, respectively.

[0008] Furthermore, the substrate of the gap tape is integrally formed, and the surface of the substrate corresponding to the adhesive area has adhesive liquid.

[0009] Furthermore, the base material of the gap tape is polyethylene terephthalate (PET) or polyimide (PI).

[0010] Furthermore, the adhesive is made of acrylic pressure-sensitive adhesive or acrylic adhesive.

[0011] Furthermore, the base color of the gap tape is different from the color of the adhesive.

[0012] Furthermore, the substrate of the gap tape is transparent, and the adhesive liquid is blue.

[0013] Furthermore, in the arrangement direction of the adhesive and non-adhesive areas, the width of the gap tape is greater than or equal to 5 mm and less than or equal to 150 mm; and / or the width of the adhesive area is greater than or equal to 1 mm and less than or equal to 100 mm.

[0014] Furthermore, the ratio of the thickness of the non-adhesive area of ​​the gap tape to the thickness of the adhesive area of ​​the gap tape is greater than or equal to 1 / 10 and less than or equal to 9 / 10.

[0015] According to another aspect of the present invention, a secondary battery is provided, including the aforementioned insulating component.

[0016] Applying the technical solution of this utility model, the insulating component in this application includes an insulating component body and at least two gap tapes. The insulating component body, after being bent multiple times, forms a polyhedral structure with an opening at the top. The polyhedral structure consists of two opposing first side surfaces, two opposing second side surfaces, and an insulating bottom surface, with the insulating bottom surface corresponding to the bottom surface of the electrode assembly of the secondary battery. Each second side surface is respectively provided with at least one gap tape, the gap tape including an adhesive area and a non-adhesive area. The adhesive area covers the second side surface and the insulating bottom surface, and at least a portion of the non-adhesive area covers the two first side surfaces.

[0017] When using the insulating component of this application, the insulating component body can form a polyhedral structure with an opening at the top after multiple bending. Therefore, the insulating component body, after forming the polyhedral structure, can be fitted over the electrode assembly, thus protecting the electrode assembly and ensuring insulation between the electrode assembly and the battery casing. Furthermore, since the insulating component of this application also has a gap tape, the gaps in the polyhedral structure can be sealed with the gap tape, preventing conductive materials inside the electrode assembly, such as carbon particles, from contacting the casing and causing electrochemical corrosion. Moreover, since the gap tape has adhesive and non-adhesive areas, when bending and pasting the gap tape onto the polyhedral structure formed by the insulating component body, the non-adhesive area prevents adhesive from overflowing outside the area covered by the gap tape. This avoids the problem in the prior art where excess adhesive gets stuck on the edge of the casing opening when the electrode assembly is installed, leading to welding defects on the casing top cover. Therefore, the insulating component of this application effectively solves the problem of poor performance of existing insulating components. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of an insulating component according to a specific embodiment of the present invention is shown;

[0020] Figure 2 It shows Figure 1 A schematic diagram of the structure of the insulating component before it is bent.

[0021] Figure 3 A schematic diagram of the structure of the gap tape of the insulating component according to a specific embodiment of this application is shown;

[0022] Figure 4 An exploded view of a portion of the structure of a secondary battery according to a specific embodiment of this application is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Insulating body; 11. First side; 12. Second side; 13. Insulating bottom surface; 14. Bending line; 15. First region; 16. Second region; 17. Third region; 18. Fourth region; 20. Electrode assembly; 30. Gap tape; 31. Adhesive area; 32. Unadhesive area; 40. Top cover; 50. Base plate. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0028] To address the problem of poor performance of insulating components in the prior art, this application provides an insulating component and a secondary battery.

[0029] And, as Figures 1 to 4 As shown, the secondary battery in this application has the following insulating components.

[0030] The insulating component in this application includes an insulating component body 10 and at least two gap tapes 30. The insulating component body 10 is formed into a polyhedral structure with an opening at the top after being bent multiple times. The polyhedral structure consists of two opposing first side surfaces 11, two opposing second side surfaces 12, and an insulating bottom surface 13, and the insulating bottom surface 13 corresponds to the bottom surface of the electrode assembly 20 of the secondary battery. Each second side surface 12 is provided with at least one gap tape 30. The gap tape 30 includes an adhesive area 31 and an adhesive-free area 32. The adhesive area 31 covers the second side surface 12 and the insulating bottom surface 13, and at least a portion of the adhesive-free area 32 covers the two first side surfaces 11.

[0031] When using the insulating component of this application, since the insulating component body 10 can form a polyhedral structure with an opening at the top after multiple bending, the insulating component body 10 after forming the polyhedral structure can be fitted onto the outside of the electrode assembly 20, thereby protecting the electrode assembly 20 and ensuring insulation between the electrode assembly 20 and the battery casing. Furthermore, since the insulating component of this application also has a gap tape 30, the gaps in the polyhedral structure can be sealed by the gap tape 30, thereby preventing conductive materials inside the electrode assembly 20, such as carbon particles, from contacting the casing through these gaps and causing electrochemical corrosion. Moreover, since the gap tape 30 has an adhesive area 31 and a non-adhesive area 32, when the gap tape 30 is bent and pasted onto the polyhedral structure formed by the insulating component body 10, the non-adhesive area 32 prevents the adhesive from overflowing from the adhesive area 31 outside the area covered by the gap tape 30, thus avoiding the problem in the prior art where excess adhesive gets stuck on the edge of the casing opening when the electrode assembly 20 is inserted into the casing, leading to welding defects on the casing top cover 40. Therefore, the insulating component in this application effectively solves the problem of poor performance of insulating components in the prior art.

[0032] Optionally, the substrate of the gap tape 30 is integrally formed, and the surface of the substrate corresponding to the adhesive area 31 has adhesive. That is, the substrate surface of the adhesive area 31 has adhesive, while the substrate surface of the non-adhesive area 32 does not have adhesive, and the substrates of the adhesive area 31 and the non-adhesive area 32 are integrally formed, both being the substrate of the gap tape 30. In this case, although the non-adhesive area 32 cannot be bonded to the polyhedral structure, when the polyhedral structure is encased in the shell after covering the electrode assembly 20, the filling effect of the electrode assembly 20 and the supporting effect of the shell ensure that the polyhedral structure can adhere to the non-adhesive area 32 without causing the non-adhesive area 32 to lift up.

[0033] Optionally, the base material of the gap tape 30 is polyethylene terephthalate (PET), polyimide (PI) or other insulating materials, preferably PET.

[0034] Optionally, the base color of the gap tape 30 is different from the color of the adhesive. For example, the base of the gap tape 30 is transparent, and the adhesive is blue. This arrangement facilitates the identification of the adhesive-covered area 31 and the non-adhesive-covered area 32, making the assembly process more convenient and efficient. Therefore, in this application, the base of the gap tape 30 can be a colorless and transparent base.

[0035] Optionally, the adhesive on the substrate surface of the adhesive region 31 is made of acrylic pressure-sensitive adhesive, acrylic adhesive or other adhesives commonly used in the art, preferably acrylic pressure-sensitive adhesive.

[0036] Optionally, the insulating body 10 is a Mylar membrane, and the Mylar membrane is made of polypropylene (PP).

[0037] In this application, the insulating body 10 is a sheet-like or plate-like rectangle before bending, and has multiple bending lines 14, allowing it to form a polyhedral structure after bending along these lines. Generally, the polyhedral structure can be a cuboid with an opening at the top. Alternatively, the insulating body 10 can be cut along the bending lines 14 during bending to facilitate bending and form a polyhedral structure. Furthermore, the multiple bending lines 14 on the insulating body 10 can divide it into different regions, each corresponding to a first side 11, a second side 12, and an insulating bottom surface 13 of the resulting polyhedral structure. The second side 12 of the bent polyhedral structure can be composed of multiple different regions, while the first side 11 and the insulating bottom surface 13 are each composed of a single region. In other words, the second side 12 is formed by splicing together multiple bent areas of the insulating body 10. At this time, the sum of the areas of the multiple bent areas is greater than the area of ​​the second side 12. For the polyhedral second side 12, there will be gaps at the two corners formed between the second side 12 and the insulating bottom surface 13 and the first side 11, so gap tape 30 is needed to seal them.

[0038] In this application, the first side 11 corresponds to the large side of the electrode assembly 20 and the second side 12 corresponds to the small side of the electrode assembly 20, or in other words, the area of ​​the first side 11 is larger than the area of ​​the second side 12.

[0039] In such Figure 2 In the illustrated embodiment, multiple bends 14 divide the insulating body 10 into a first region 15, two second regions 16 located on both sides of the first region 15 along its length, two third regions 17 located at both ends of the first region 15 along its length, and four fourth regions 18 located at the four corners of the insulating body 10, with each fourth region 18 adjacent to both the second and third regions 16. Therefore, the first region 15 corresponds to the insulating bottom surface 13 of the polyhedral structure, the second region 16 corresponds to the first side surface 11 of the polyhedral structure, and the third and fourth regions 17 partially overlap to form the second side surface 12.

[0040] Specifically, there are two adhesive-free areas 32, and an adhesive area 31 is located between the two adhesive-free areas 32, with the two adhesive-free areas 32 symmetrically arranged about the adhesive area 31. This arrangement ensures that the two adhesive-free areas 32 correspond to the two first side surfaces 11, so that the adhesive overflowing from the adhesive area 31 onto the large surface of the electrode assembly 20 can be covered by the adhesive-free areas 32. This prevents the adhesive from the gap tape 30 from contacting the housing during the process of placing the insulating body 10 into the housing after covering the electrode assembly 20, thereby preventing welding defects on the top cover of the housing.

[0041] In one specific embodiment of this application, the gap tape 30 further has two first fold lines and one second fold line. At least a portion of the first fold line coincides with the connection between the first side surface 11 and the second side surface 12, and at least another portion of the first fold line coincides with the connection between the first side surface 11 and the insulating bottom surface 13. The second fold line is disposed between the two first fold lines, and the second fold line divides the adhesive area 31 into two parts corresponding to the second side surface 12 and the insulating bottom surface 13, respectively. Specifically, the first fold line and the second fold line are perpendicular to each other; and the two ends of the second fold line are respectively connected to the two first fold lines. That is, the connection between the second fold line and the two first fold lines corresponds to the two corners formed between the second side surface 12 and the insulating bottom surface 13 and the first side surface 11, respectively. Furthermore, in this application, the length of the gap tape 30 in the first fold line direction can be greater than the length of the gap tape 30 in the second fold line direction.

[0042] Optionally, a first fold line is provided at the connection point between the two glue-free areas 32 and the glued area 31. That is, at this time, the glue-free area 32 only covers the first side 11.

[0043] Optionally, each adhesive-free area 32 is provided with a first fold line. In this case, the adhesive-free area 32 not only covers the first side 11, but also the second side 12 and the insulating bottom surface 13.

[0044] In other words, in the length direction of the second fold line, for the adhesive region 31, the length of the adhesive region 31 is less than or equal to the length of the second side surface 12.

[0045] Optionally, in the arrangement direction of the adhesive-coated area 31 and the non-adhesive-coated area 32, the width of the gap tape 30 is greater than or equal to 5 mm and less than or equal to 150 mm; alternatively, the width of the adhesive-coated area 31 is greater than or equal to 1 mm and less than or equal to 100 mm. That is, the adhesive-coated area 31 and the non-adhesive-coated area 32 are arranged along the width direction of the gap tape 30. Of course, in this application, the specific dimensional parameters of the gap tape 30 can be adaptively adjusted according to actual design requirements.

[0046] Optionally, the ratio of the thickness of the gap tape 30 corresponding to the adhesive-free area 32 to the thickness of the gap tape 30 corresponding to the adhesive area 31 is greater than or equal to 1 / 10 and less than or equal to 9 / 10. Furthermore, in this application, the thickness of the gap tape 30 corresponding to the adhesive-free area 32 can be adaptively adjusted according to actual usage requirements. By designing the thickness of the gap tape 30 corresponding to the adhesive-free area 32 to be less than the thickness of the gap tape 30 corresponding to the adhesive area 31, it is possible to effectively reduce the resistance of the insulating component when it enters the housing along with the electrode assembly 20.

[0047] Optionally, the insulating bottom surface 13 may also be provided with a corresponding bottom support plate 50.

[0048] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0049] When using the insulating component of this application, the insulating component body can form a polyhedral structure with an opening at the top after multiple bending. Therefore, the insulating component body, after forming the polyhedral structure, can be fitted over the electrode assembly, thus protecting the electrode assembly and ensuring insulation between the electrode assembly and the battery casing. Furthermore, since the insulating component of this application also has a gap tape, the gaps in the polyhedral structure can be sealed with the gap tape, preventing conductive materials inside the electrode assembly, such as carbon particles, from contacting the casing and causing electrochemical corrosion. Moreover, since the gap tape has adhesive and non-adhesive areas, when bending and pasting the gap tape onto the polyhedral structure formed by the insulating component body, the non-adhesive area prevents adhesive from overflowing outside the area covered by the gap tape. This avoids the problem in the prior art where excess adhesive gets stuck on the edge of the casing opening when the electrode assembly is installed, leading to welding defects on the casing top cover. Therefore, the insulating component of this application effectively solves the problem of poor performance of existing insulating components.

[0050] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, 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.

[0052] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An insulating member, characterized by, include: The insulating body (10) is formed by bending the insulating body (10) multiple times to form a polyhedral structure with an opening at the top. The polyhedral structure consists of two opposing first side surfaces (11), two opposing second side surfaces (12), and an insulating bottom surface (13). The insulating bottom surface (13) corresponds to the bottom surface of the electrode assembly (20) of the secondary battery. At least two gap tapes (30) are provided, and each second side (12) is provided with at least one gap tape (30). The gap tape (30) includes an adhesive area (31) and an adhesive-free area (32). The adhesive area (31) covers the second side (12) and the insulating bottom surface (13). At least a portion of the adhesive-free area (32) covers the two first side surfaces (11).

2. The insulator of claim 1, wherein There are two glue-free areas (32), and the glued area (31) is located between the two glue-free areas (32), and the two glue-free areas (32) are symmetrically arranged with respect to the glued area (31).

3. The insulator of claim 2, wherein, The gap tape (30) also has two first fold lines and one second fold line. At least a portion of the first fold line coincides with the connection between the first side surface (11) and the second side surface (12), and at least another portion of the first fold line coincides with the connection between the first side surface (11) and the insulating bottom surface (13); The second fold line is disposed between the two first fold lines, and the second fold line divides the adhesive area (31) into two parts corresponding to the second side surface (12) and the insulating bottom surface (13), respectively.

4. The insulating component according to claim 1, characterized in that, The substrate of the gap tape (30) is integrally formed, and the surface of the substrate has adhesive liquid on the part corresponding to the adhesive area (31).

5. The insulating component according to claim 4, characterized in that, The substrate material of the gap tape (30) is polyethylene terephthalate or polyimide; and / or; The adhesive is made of acrylic pressure-sensitive adhesive or acrylic adhesive.

6. The insulating component according to claim 4, characterized in that, The base color of the gap tape (30) is different from the color of the adhesive liquid.

7. The insulating component according to claim 6, characterized in that, The substrate of the gap tape (30) is transparent, and the adhesive liquid is blue.

8. The insulator of claim 1, wherein In the arrangement direction of the glued area (31) and the non-glue area (32), The width of the gap tape (30) is greater than or equal to 5 mm and less than or equal to 150 mm; and / or The width of the adhesive area (31) is greater than or equal to 1 mm and less than or equal to 100 mm.

9. The insulator of claim 1, wherein The ratio of the thickness of the gap tape (30) corresponding to the adhesive-free area (32) to the thickness of the gap tape (30) corresponding to the adhesive area (31) is greater than or equal to 1 / 10, and Less than or equal to 9 / 10.

10. A secondary battery characterized by comprising: Including the insulating element as described in any one of claims 1 to 9.

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