Safe battery cell

Abstract

The utility model belongs to the technical field of battery safety, and particularly relates to a safe battery cell which comprises a battery cell formed by stacking or winding a plurality of positive plates, negative plates and diaphragms, and the battery cell is provided with an extension part protruding outwards; the tab is arranged on one side of the extension part, and the tab is fixedly connected with the extension part; and the safety gummed paper is arranged at the joint of the tab and the extension part, and the safety gummed paper covers the whole extension part and part of the tab. The safety gummed paper is arranged at the joint of the tab and the extension part to cover the whole extension part and part of the tab, so that burrs are effectively prevented from puncturing the surface shell of the battery, the safety of the battery is improved, meanwhile, the volume and the weight of the battery are not obviously increased, and good heat dissipation performance can be kept.

Description

Technical Field

[0001] This utility model belongs to the field of battery safety technology, and in particular relates to a safe battery cell. Background Technology

[0002] For multi-tab winding cores, stacked cores, etc., it is necessary to perform transition welding at the battery extension section to weld the external tabs. After the transition welding, in order to fix the position of the tabs and prevent the transition welding area from piercing the aluminum-plastic film, a layer of adhesive tape needs to be applied, and then the tab bending process is carried out.

[0003] After bending, one side of the connection is inside the bend. Even if there are burrs on this side, they will not puncture the battery casing and the impact is minimal. However, the other side is in direct contact with the battery casing, and burrs on this side can puncture the battery casing, thus affecting battery safety. Therefore, a technical solution is needed to address the above problem, which can improve battery safety and prevent burrs from puncturing the battery casing. Utility Model Content

[0004] The purpose of this utility model is to design a safe battery cell based on the inventor's own practice and actual usage, in order to solve the technical problem that burrs after welding the tabs and extension parts can puncture the battery casing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A safe battery cell includes a cell formed by stacking or winding multiple positive electrode plates, negative electrode plates and separators, the cell having an outwardly protruding extension;

[0007] A tab is provided on one side of the extension portion and is fixedly connected to the extension portion;

[0008] Safety tape is provided at the connection between the electrode tab and the extension portion, and the safety tape covers the entire extension portion and part of the electrode tab.

[0009] Furthermore, the safety tape includes a first safety tape and a second safety tape, which are respectively placed on both sides of the electrode tab.

[0010] Furthermore, the first safety adhesive tape and the second safety adhesive tape are symmetrically disposed on both sides of the electrode tab along the thickness direction of the battery cell.

[0011] Furthermore, one end of both the first and second safety tapes is connected to the battery cell, and the other end of both the first and second safety tapes is connected to the electrode tab. The connection point between the extension portion and the electrode tab is located within the coverage area of ​​the first and second safety tapes.

[0012] Furthermore, the first safety tape has a single-layer structure, while the second safety tape has a double-layer structure.

[0013] Furthermore, the second safety adhesive tape includes an inner layer of safety adhesive tape and an outer layer of safety adhesive tape, which are formed by bonding or integral molding.

[0014] Furthermore, the inner layer of safety adhesive tape is attached to the tab and the extension portion, and the outer layer of safety adhesive tape is disposed on the side of the inner layer of safety adhesive tape away from the tab.

[0015] Furthermore, the height of the outer layer of safety tape is less than the height of the inner layer of safety tape, and the position of the outer layer of safety tape on the inner layer of safety tape corresponds to the connection point between the tab and the extension.

[0016] Furthermore, one first safety tape and one second safety tape are provided, and the multiple tabs and multiple extensions are covered together by the corresponding first safety tape and second safety tape.

[0017] Another solution provided in this application is that the number of the first safety tape and the second safety tape corresponds to the number of the tabs and the extensions, and each corresponding first safety tape and the second safety tape corresponds to one tab and the extension, and the corresponding tabs and extensions are covered by the first safety tape and the second safety tape.

[0018] The beneficial effects of this utility model are as follows: This utility model provides a safe battery cell, comprising a cell formed by stacking or winding multiple positive electrode plates, negative electrode plates, and a separator. The cell has an outwardly protruding extension portion; tabs are disposed on one side of the extension portion and are fixedly connected to the extension portion; safety adhesive tape is disposed at the connection between the tabs and the extension portion, covering the entire extension portion and part of the tabs. By providing safety adhesive tape at the connection between the tabs and the extension portion, covering the entire extension portion and part of the tabs, burrs are effectively prevented from puncturing the battery casing, improving battery safety. Simultaneously, it does not significantly increase the battery's size and weight and maintains good heat dissipation performance. Attached Figure Description

[0019] The following will refer to the appendix. Figures 1 to 7This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery cell in Embodiment 1 of this utility model;

[0021] Figure 2 This is a side view of the battery cell in Embodiment 1 of this utility model;

[0022] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0023] Figure 4 This is a schematic diagram of the structure of the battery cell tab after bending in Embodiment 1 of this utility model;

[0024] Figure 5 This is a side view of the battery cell tab after bending in Embodiment 1 of this utility model;

[0025] Figure 6 for Figure 5 A magnified view of part B in the diagram;

[0026] Figure 7 This is a schematic diagram of the overall structure of the battery cell in Embodiment 2 of this utility model.

[0027] In the picture: 1. Battery cell; 2. Electrode tab; 3. Safety tape;

[0028] 11. Extension section;

[0029] 31. First safety tape; 32. Second safety tape;

[0030] 321. Inner layer safety tape; 322. Outer layer safety tape. Detailed Implementation

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] The following is in conjunction with the appendix Figures 1 to 7 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0036] Example 1

[0037] This embodiment discloses a safety battery cell 1, which includes a battery cell 1 formed by stacking or winding multiple positive electrode plates, negative electrode plates and separators, and the battery cell 1 has an outwardly protruding extension portion 11;

[0038] Electrode 2 is disposed on one side of extension 11 and is fixedly connected to extension 11;

[0039] Safety tape 3 is provided at the connection between the tab 2 and the extension 11, and the safety tape 3 covers the entire extension 11 and part of the tab 2.

[0040] By setting safety tape 3 at the connection between the tab 2 and the extension 11, covering the entire extension 11 and part of the tab 2, burrs are effectively prevented from puncturing the battery casing, improving battery safety. At the same time, the size and weight of the battery are not significantly increased, and good heat dissipation performance is maintained.

[0041] The extension 11 of the battery cell 1 can be formed by stamping, cutting, or folding processes, and its protruding length can be adjusted according to the welding requirements of the tab 2. The tab 2 can be made of copper, aluminum, or nickel and is fixedly connected to the extension 11 by laser welding, ultrasonic welding, or resistance welding. The safety tape 3 is preferably made of polyimide tape, polyester tape, or acrylic tape, and the coverage area of ​​the tape should extend at least 5 mm beyond the connection between the tab 2 and the extension 11. As a preferred embodiment, the safety tape 3 can be pre-coated with hot melt adhesive and firmly bonded by heating and pressurizing.

[0042] This technical solution effectively solves the safety hazard of burrs piercing the battery casing in the transition welding area by setting a full-coverage safety adhesive tape 3 at the connection between the tab 2 and the extension 11 of the cell 1. Specifically, the safety adhesive tape 3 forms an overall cover for the welding area. In the subsequent bending process of the tab 2, the tape can play an isolation and protection role, preventing burrs from piercing the battery casing and thus affecting battery safety.

[0043] Furthermore, the safety tape 3 includes a first safety tape 31 and a second safety tape 32, which are respectively placed on both sides of the tab 2.

[0044] By providing a first safety adhesive tape 31 and a second safety adhesive tape 32 on both sides of the tab 2, burrs at the connection between the tab 2 and the extension 11 can be effectively prevented from piercing the battery casing. The first safety adhesive tape 31 primarily serves to fix the position of the tab 2, while the second safety adhesive tape 32 provides an additional protective layer. When the tab 2 is bent, the safety adhesive tapes 32 on both sides work together to ensure that the connection is completely covered, preventing burrs from being exposed. Compared to solutions that only provide tape on one side, this solution significantly improves the battery's safety performance, especially in preventing burrs from the tab 2 from piercing the aluminum-plastic film.

[0045] Specifically, the first safety adhesive tape 31 and the second safety adhesive tape 32 are respectively set on both sides of the tab 2 to fully cover the tab 2, prevent the tab 2 from directly contacting the battery casing, and further prevent welding burrs from contacting the battery casing, which could cause the battery casing to crack and reduce battery safety.

[0046] Furthermore, the first safety tape 31 and the second safety tape 32 are symmetrically arranged on both sides of the tab 2 along the thickness direction of the battery cell 1.

[0047] Specifically, symmetrical arrangement means that the first safety tape 31 and the second safety tape 32 are mirror images of each other in the thickness direction of the cell 1 with the tab 2 as the center line. As a preferred embodiment, symmetrical arrangement can be achieved by setting the size, shape and material of the first safety tape 31 and the second safety tape 32 to be exactly the same, and pasting them at equal intervals with the center line of the tab 2 as the reference.

[0048] Therefore, by symmetrically arranging the first safety tape 31 and the second safety tape 32, the protective effect on both sides of the tab 2 can be ensured to be consistent, effectively preventing the battery casing from being punctured by burrs on the tab 2. Specifically, during the bending process of the tab 2, the symmetrically arranged safety tapes 3 can evenly distribute the stress, preventing the tape from falling off or shifting due to excessive force on one side. At the same time, the symmetrical arrangement can also ensure balanced heat dissipation on both sides of the tab 2, avoiding localized overheating.

[0049] Furthermore, one end of the first safety tape 31 and the second safety tape 32 are both connected to the battery cell 1, and the other end of the first safety tape 31 and the second safety tape 32 are both connected to the electrode tab 2. The connection between the extension portion 11 and the electrode tab 2 is located within the coverage area of ​​the first safety tape 31 and the second safety tape 32.

[0050] Specifically, the first safety tape 31 and the second safety tape 32 are respectively connected to the tab 2 and the battery cell 1. The first safety tape 31 and the second safety tape 32 can also increase the stability of the connection between the battery cells 1 and the battery cell 1. The tab 2 is affected by the tension of the first safety tape 31 and the second safety tape 32 and always maintains a stable connection with the battery cell 1. The connection between the extension 11 and the tab 2 is completely covered by the first safety tape 31 and the second safety tape 32 on both sides, which further reduces the risk of burrs at the connection being exposed to the outside.

[0051] Furthermore, the first safety tape 31 has a single-layer structure, while the second safety tape 32 has a double-layer structure.

[0052] Specifically, the second safety tape 32 includes an inner layer safety tape 321 and an outer layer safety tape 322, which are formed by bonding or integral molding.

[0053] Therefore, this technical solution employs an asymmetrical adhesive tape structure design, featuring a double-layer protective structure on the side of the tab 2 that directly contacts the battery casing after bending. This effectively prevents burrs on that side from puncturing the battery casing. The height and position of the outer safety adhesive tape 322 are specially designed to ensure both protective effectiveness and material waste. Compared to existing technologies, this solution achieves optimal material utilization while maintaining safety.

[0054] Furthermore, the inner layer of safety adhesive tape 321 is attached to the tab 2 and the extension portion 11, and the outer layer of safety adhesive tape 322 is disposed on the side of the inner layer of safety adhesive tape 321 away from the tab 2.

[0055] Specifically, the height of the outer layer of safety tape 322 is less than the height of the inner layer of safety tape 321, and the position of the outer layer of safety tape 322 on the inner layer of safety tape 321 corresponds to the connection between the tab 2 and the extension 11.

[0056] The inner layer of safety tape 321 can be made of polyimide tape or polyester tape, and the outer layer of safety tape 322 can be made of the same or different material as the inner layer. As a preferred embodiment, the outer layer of safety tape 322 can be made of a material with higher puncture resistance, such as aramid fiber reinforced tape. Specifically, the installation position of the outer layer of safety tape 322 can be precisely aligned with the welding area between the tab 2 and the extension 11, which usually produces more burrs.

[0057] By adding a reinforced outer layer of safety tape 322 to one side of the inner layer of safety tape 321, burrs can be better prevented from piercing the tape, thereby reducing the chance of the battery causing safety hazards.

[0058] Furthermore, one first safety tape 31 and one second safety tape 32 are provided, and the multiple tabs 2 and multiple extensions 11 are covered together by the corresponding first safety tape 31 and second safety tape 32.

[0059] Specifically, the first safety tape 31 and the second safety tape 32 can be in the form of a continuous strip, with a length sufficient to cover all the connection areas of the tabs 2 and the extension 11. As a preferred embodiment, the first safety tape 31 and the second safety tape 32 can be pre-cut to a specific length and width and simultaneously applied to both sides of the tab 2 group and the extension 11 group. The width of the tape should ensure complete coverage of the connection between the tabs 2 and the extension 11, extending to a portion of the surface of the tabs 2 and the extension 11. Furthermore, the adhesive strength of the tape must meet the requirement of maintaining a fixed position during the subsequent bending process of the tabs 2.

[0060] Therefore, this technical solution simplifies the manufacturing process and improves assembly efficiency by using a single first safety adhesive tape 31 and a second safety adhesive tape 32 to completely cover multiple tabs 2 and extension portions 11. Simultaneously, the overall covering method ensures effective protection at all connections between the tabs 2 and the extension portions 11, avoiding protection failures caused by incomplete tape application in individual locations. This solution is particularly suitable for cell 1 structures with multiple tabs 2, reducing production costs while ensuring safety.

[0061] Example 2

[0062] The number of first safety tapes 31 and second safety tapes 32 corresponds to the number of tabs 2 and extensions 11. Each corresponding first safety tape 31 and second tab 2 corresponds to one tab 2 and one extension 11. The first safety tape 31 and second safety tape 32 cover the corresponding tab 2 and extension 11.

[0063] Specifically, the number of first safety tapes 31 and second safety tapes 32 corresponds to the number of tabs 2 and extensions 11, meaning that each connection point of tab 2 and extension 11 is provided with a set of independent first safety tapes 31 and second safety tapes 32. For example, when the battery cell 1 has multiple tabs 2 and extensions 11, each connection point of tab 2 and extension 11 is provided with a set of first safety tapes 31 and second safety tapes 32, instead of covering all tabs 2 and extensions 11 together. As a preferred embodiment, the first safety tapes 31 and second safety tapes 32 can adopt a single-layer structure and a double-layer structure, respectively. The double-layer structure of the second safety tape 32 can include an inner layer safety tape 321 and an outer layer safety tape 322. The inner layer safety tape 321 is attached to the tab 2 and extension 11, and the outer layer safety tape 322 is located on the side of the inner layer safety tape 321 away from the tab 2.

[0064] Therefore, by providing independent first safety tape 31 and second safety tape 32 for each tab 2 and extension 11, this technical solution can more precisely cover the connection between each tab 2 and extension 11, thereby effectively preventing burrs in the transfer welding area from puncturing the battery casing.

[0065] The other structures are the same as in Embodiment 1, and will not be described in detail in this embodiment.

[0066] Example 3

[0067] Unlike Embodiment 1, in this embodiment the positions of the inner safety tape 321 and the outer safety tape 322 can be interchanged, that is, the outer safety tape 322 is placed between the inner safety tape 321 and the tab 2.

[0068] The other structures are the same as in Embodiment 1, and will not be described in detail in this embodiment.

[0069] Example 4

[0070] This embodiment discloses a bonding process for the second safety tape 32. In this embodiment, the outer layer safety tape 322 and the inner layer tape are connected by adhesive placement. First, the inner layer safety tape 321 is pasted to one side of the tab 2. After confirming that the position of the inner layer safety tape 321 is accurate, the outer layer safety tape 322 is pasted to the position corresponding to the connection point of the inner layer safety tape 321.

[0071] Example 5

[0072] This embodiment also discloses a bonding process for the second safety tape 32, but it differs from Embodiment 4 in that the outer layer of safety tape 322 is first aligned with the joint and bonded. After the position is confirmed, the inner layer of safety tape 321 is then placed over the outer layer of safety tape 322.

[0073] Everything else is the same as in Example 4, and will not be described in detail in this example.

[0074] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0075] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A safe battery cell, characterized in that: include A battery cell consisting of multiple positive electrode plates, negative electrode plates, and separators stacked or wound together, the battery cell having an outwardly protruding extension; A tab is provided on one side of the extension portion and is fixedly connected to the extension portion; Safety tape is provided at the connection between the electrode tab and the extension portion, and the safety tape covers the entire extension portion and part of the electrode tab.

2. The safety battery cell according to claim 1, characterized in that: The safety tape includes a first safety tape and a second safety tape, which are respectively placed on both sides of the electrode tab.

3. The safety battery cell according to claim 2, characterized in that: The first safety adhesive tape and the second safety adhesive tape are symmetrically disposed on both sides of the electrode tab along the thickness direction of the battery cell.

4. The safety battery cell according to claim 2, characterized in that: One end of both the first and second safety tapes is connected to the battery cell, and the other end of both the first and second safety tapes is connected to the electrode tab. The connection point between the extension portion and the electrode tab is located within the coverage area of ​​the first and second safety tapes.

5. The safety battery cell according to claim 2, characterized in that: The first safety tape has a single-layer structure, and the second safety tape has a double-layer structure.

6. The safety battery cell according to claim 5, characterized in that: The second safety tape includes an inner layer of safety tape and an outer layer of safety tape, which are formed by bonding or integral molding.

7. The safety battery cell according to claim 6, characterized in that: The inner layer of safety adhesive paper is attached to the tab and the extension portion, and the outer layer of safety adhesive paper is disposed on the side of the inner layer of safety adhesive paper away from the tab.

8. The safety battery cell according to claim 7, characterized in that: The height of the outer layer of safety tape is less than the height of the inner layer of safety tape, and the position of the outer layer of safety tape on the inner layer of safety tape corresponds to the connection point between the tab and the extension.

9. The safety battery cell according to any one of claims 2-8, characterized in that: One first safety tape and one second safety tape are provided, and the multiple tabs and multiple extensions are covered together by the corresponding first safety tape and second safety tape.

10. The safety battery cell according to any one of claims 2-8, characterized in that: The number of the first safety tape and the second safety tape corresponds to the number of the tabs and the extensions. Each corresponding first safety tape and second safety tape corresponds to one tab and one extension. The first safety tape and the second safety tape cover the corresponding tabs and extensions.

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