Adhesive tape sheet, composite adhesive tape and battery
By designing a tape sheet with a deformed part, the problem that the secondary battery cannot release the deformation during expansion is solved, and the adaptive release and stability management of battery expansion is realized.
Patent Information
- Application Number
- CN202421872417.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-02
AI Technical Summary
In secondary batteries, when the electrode assembly expands during use, the electrode plate itself is inelastic and the end is bound by conventional tape, and the deformation is not released, resulting in the expansion of the battery being unable to be released.
A tape sheet is designed, including a base part and a deformation part connected along the length direction. The base part is used to adhere to the main body of the electrode assembly, and the deformed part is attached to the main body and end of the electrode assembly. It can stretch and deform as the end moves when the electrode assembly expands, and reasonably adjust the binding force of the tape strip to provide expansion space.
Through this design, the battery can adaptively release the deformation during the expansion process to avoid falling apart, while effectively managing the expansion volume and improving the stability of the battery use.
Smart Images
Figure CN222907800U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power batteries, and in particular, to an adhesive tape sheet, a composite adhesive tape and a battery. Background Art
[0002] In a secondary battery, an electrode assembly is generally formed by tightly winding a negative electrode sheet, a separator and a positive electrode sheet, and the end of the electrode assembly is fixed by an adhesive tape sheet to prevent it from coming apart during the use of the battery.
[0003] However, since the electrode sheet itself is not an elastomer, it cannot release the amount of deformation when it expands; and since the end of the electrode sheet is restricted by a conventional adhesive tape, the expansion generated during the use of the battery cannot be released. Summary of the Utility Model
[0004] The purpose of the utility model is to provide an adhesive tape sheet, a composite adhesive tape and a secondary battery, which can reasonably adjust the binding force of the adhesive tape strip, provide a certain space for the expansion of the electrode assembly, and release the expansion amount of the battery.
[0005] The embodiments of the utility model are implemented as follows:
[0006] In a first aspect, the utility model provides an adhesive tape sheet, including a base portion and a deformation portion connected along the length direction. The base portion is used for adhering to the main body of the electrode assembly, and the deformation portion adheres to the main body and the end of the electrode assembly, and is used for stretching and deforming along with the movement of the end of the electrode assembly when the electrode assembly expands.
[0007] In an optional embodiment, the initial length dimension a of the deformation portion 0 satisfies the following relational expression:
[0008] 10mm ≤ a 0 ≤ 12.6mm.
[0009] In an optional embodiment, the initial length dimension a of the deformation portion 0 and the extension dimension a of the deformation portion satisfy the following relational expression:
[0010] 1 ≤ a / a 0 ≤ 1.5.
[0011] In an optional embodiment, the sum L of the lengths of the base portion and the deformation portion 1 and the perimeter L of the electrode assembly satisfy the following relational expression:
[0012] 0mm ≤ L - L 1 ≤ 3mm.
[0013] In an alternative embodiment, the tape piece further includes an overlapping portion, and the overlapping portion is connected to one end of the deformable portion away from the base portion and is used for adhering to the base portion.
[0014] In an alternative embodiment, the sum of the lengths of the base portion, the deformable portion, and the overlapping portion, L 2 and the perimeter L of the electrode assembly satisfy the following relationship:
[0015] 0 mm < L 2 - L ≤ 10 mm.
[0016] In an alternative embodiment, the deformable portion is made of polyurethane or polyvinyl alcohol.
[0017] In an alternative embodiment, the deformable portion and / or the base portion are provided with ventilation holes.
[0018] In a second aspect, the present utility model provides a composite tape, including at least two tape pieces of any one of the foregoing embodiments connected along the length direction, and any two adjacent tape pieces are connected through a tearing portion.
[0019] In a third aspect, the present utility model provides a battery, including an electrode assembly and a tape piece of any one of the foregoing embodiments, and the tape piece is adhered to the electrode assembly.
[0020] The beneficial effects of the embodiments of the present utility model include:
[0021] The present application provides a tape piece, a composite tape, and a battery. The tape piece includes a base portion and a deformable portion connected along the length direction. Among them, the base portion is used for adhering to the main body of the electrode assembly, so as to firmly adhere one end of the tape piece to the electrode assembly. The deformable portion is adhered to the main body and the end of the electrode assembly to fix the end of the electrode assembly to the main body of the electrode assembly, ensuring that the electrode assembly will not fall apart during use. And, the deformable portion is used for stretching and deforming as the end of the electrode assembly moves when the electrode assembly expands, so as to reasonably adjust the binding force of the tape strip, provide a certain space for the expansion of the electrode assembly, and release the battery expansion amount. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0023] Figure 1 Schematic diagram of the composite tape provided by the embodiment of the present utility model;
[0024] Figure 2 Schematic diagram of the tape piece provided by the embodiment of the present utility model applied to the electrode assembly;
[0025] Figure 3 Schematic diagram of the tape piece provided by the embodiment of the present utility model.
[0026] Reference numerals: 10 - tape piece; 30 - composite tape; 50 - electrode assembly; 100 - base part; 300 - deformed part; 500 - overlapping part. Detailed implementation manners
[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0028] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0029] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.
[0031] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0032] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0033] An embodiment of the present utility model provides a battery, especially a square or cylindrical secondary battery. The battery includes an electrode assembly 50 and a tape piece 10 adhered to the electrode assembly 50.
[0034] It should be noted that during the expansion of the battery, the tape piece 10 adhering to the end of the electrode assembly 50 can adaptively deform, so that on the basis of ensuring the fixation of the electrode assembly 50, a certain displacement adjustment can be realized at the end of the electrode tab, adapting to the expansion of the battery. It can be understood that the main body here specifically refers to the winding main body, and the end here specifically refers to the winding end.
[0035] In addition, as Figure 1 shown, an embodiment of the present utility model also provides a composite tape 30, which includes at least two of the above-mentioned tape pieces 10, and any two adjacent tape pieces 10 are connected through a tearing part, so as to facilitate the staff to quickly obtain the required tape piece 10 and avoid damage or deformation of the tape piece 10 caused by improper tearing.
[0036] Exemplarily, the tearing part can specifically be a notch or a cutting line arranged at the connection of two adjacent tape pieces 10, or a tearing strip with opposite ends respectively connected to the two tape pieces 10.
[0037] Next, the specific structures of the various components of the tape piece 10 provided in this embodiment and the corresponding relationships therebetween will be described in detail.
[0038] Figure 2 is a schematic diagram of the tape piece 10 provided in an embodiment of the present utility model applied to the electrode assembly 50. Figure 3 is a schematic diagram of the tape piece 10 provided in an embodiment of the present utility model. Please refer to Figure 2 and Figure 3 , the present application provides a tape piece 10, which includes a base part 100 and a deformation part 300 connected along the length direction.
[0039] Among them, the base part 100 is used to adhere to the main body of the electrode assembly 50, so that one end of the tape piece 10 is firmly adhered to the electrode assembly 50. The deformation part 300 adheres to the main body and the end of the electrode assembly 50 to fix the end of the electrode assembly 50 to the main body of the electrode assembly 50, ensuring that the electrode assembly 50 will not fall apart during use. Specifically, both the base part 100 and the deformation part 300 achieve adhesion through pressure-sensitive adhesive.
[0040] Moreover, the deformation part 300 is used to stretch and deform as the end of the electrode assembly 50 moves when the electrode assembly 50 expands, so as to reasonably adjust the binding force of the tape strip, provide a certain space for the expansion of the electrode assembly 50, and release the battery expansion amount.
[0041] In some embodiments, to ensure that the electrode assembly 50 adhered with the above tape piece 10 still has adhesion after soaking, the deformation part 300 is made of polyurethane or polyvinyl alcohol. It can be understood that both polyurethane and polyvinyl alcohol have a certain elastic force and can stably stay in the electrolyte.
[0042] To facilitate the penetration of the electrolyte, the deformation part 300 and / or the base part 100 are provided with ventilation holes. In addition, it should also be noted that the ventilation holes at the deformation part 300 also increase the degree of freedom of deformation, and can achieve the beneficial effect of bending or stretching more freely.
[0043] In this embodiment, to firmly adhere the end of the electrode assembly 50 to the main body of the electrode assembly 50 and at the same time control the economic manufacturing cost of the deformation part 300, the initial length dimension a of the deformation part 300 0 satisfies the following relationship: 10 mm ≤ a 0 ≤ 12.6 mm.
[0044] Correspondingly, the initial thickness dimension h of the deformation part 300 0 and the thickness dimension H of the base part 100 satisfy the following relationship: 0.7 ≤ h 0 / H ≤ 1. That is to say, the deformation part 300 becomes 30% thinner than the base part 100, and the thickness and weight are reduced, thereby ensuring the lithium electron transfer efficiency when the electrode assembly 50 is immersed in the electrolyte, and thus ensuring the energy density of the electrode assembly 50.
[0045] Optionally, to ensure the release of the expansion amount, the initial length dimension a of the deformation part 300 0 and the extension dimension a of the deformation part 300 satisfy the following relationship: 1 ≤ a / a 0 ≤ 1.5. It should be noted that the extension dimension here refers to the length difference before and after the deformation of the deformation part 300. Through the limitation of the above length difference, the rationality of adjusting the binding force of the tape strip is ensured.
[0046] Since the thickness of the deformation part 300 also changes accordingly when it is stretched and deformed in the length direction. On the above basis, to prevent the deformation part 300 from being overstretched and having an overly thin thickness, the initial thickness dimension h of the deformation part 300 0 and the compression dimension h of the deformation part 300 satisfy the following relational expression: 0 < h / h 0 ≤ 0.3. Similarly to the above, the compression dimension here refers to the thickness difference of the deformation part 300 before and after deformation. By restricting the above thickness difference, it is ensured that the deformation part 300 will not break due to excessive deformation.
[0047] To ensure the adhesion strength and adhesion firmness when the tape piece 10 is applied, in some embodiments, the sum of the lengths of the base part 100 and the deformation part 300, L 1 and the perimeter l of the electrode assembly 50 satisfy the following relational expression: 0 mm ≤ L - L 1 ≤ 3 mm. When calculating the sum of the lengths, the initial length dimensions before deformation are used for both the deformation part 300 and the base part 100, and will not be elaborated further hereinafter.
[0048] In some other embodiments, as Figure 3 shown, the tape piece 10 further includes an overlapping part 500, and the overlapping part 500 is connected to the end of the deformation part 300 away from the base part 100 and is used for adhering to the base part 100. Based on the above settings, it can be understood that after positioning and adhering the deformation part 300 at the end of the electrode assembly 50 and adhering it to the corresponding main body of the electrode assembly 50. Then, the base part 100 is pulled to conform and adhere to the main body of the electrode assembly 50. At this time, the tape piece 10 completely winds around the electrode assembly 50 for one circle, and then the overlapping part 500 is adhered to the base part 100 to achieve fixation.
[0049] On the above basis, to prevent the size of the overlapping part 500 from being too large and affecting the energy density of the electrode assembly 50, the sum of the lengths of the base part 100, the deformation part 300, and the overlapping part 500, L 2 and the perimeter L of the electrode assembly 50 satisfy the following relational expression: 0 mm < L 2 - L ≤ 10 mm.
[0050] Taking this embodiment as an example, the working process of the tape piece 10 provided by the present application is as follows:
[0051] The worker positions and adheres the deformation part 300 at the end of the electrode assembly 50 and adheres it to the corresponding main body of the electrode assembly 50 to fix the end of the electrode assembly 50 relative to the main body of the electrode assembly 50. Then, the base part 100 is pulled to conform and adhere to the main body of the electrode assembly 50. At this time, the tape piece 10 completely winds around the electrode assembly 50 for one circle, and then the overlapping part 500 is adhered to the base part 100 to achieve fixation.
[0052] In summary, the present application provides a tape piece 10, a composite tape 30, and a battery. The tape piece 10 includes a base portion 100 and a deformation portion 300 connected along the length direction. Among them, the base portion 100 is used to adhere to the main body of the electrode assembly 50, so as to firmly adhere one end of the tape piece 10 to the electrode assembly 50. The deformation portion 300 adheres to the main body and the end of the electrode assembly 50 to fix the end of the electrode assembly 50 to the main body of the electrode assembly 50, ensuring that the electrode assembly 50 will not fall apart during use. Moreover, the deformation portion 300 is used to stretch and deform as the end of the electrode assembly 50 moves when the electrode assembly 50 expands, thereby reasonably adjusting the binding force of the tape strip, providing a certain space for the expansion of the electrode assembly 50, and releasing the expansion amount of the battery.
[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An adhesive tape sheet, characterized in that: The invention comprises a base portion (100) and a deformation portion (300) connected along the length direction, wherein the base portion (100) is used to adhere to the main body of the electrode assembly (50), and the deformation portion (300) is adhered to the main body and the end of the electrode assembly (50) and is used to stretch and deform as the end of the electrode assembly (50) moves when the electrode assembly (50) expands.
2. The adhesive tape sheet according to claim 1, characterized in that: The initial length dimension a0 of the deformation portion (300) satisfies the following relationship: 10mm≤a0≤12.6mm.
3. The adhesive tape sheet according to claim 2, characterized in that: The initial length dimension a0 of the deformation portion (300) and the extension dimension a of the deformation portion (300) satisfy the following relationship: 1≤a / a0≤1.
5.
4. The adhesive tape sheet according to claim 1, characterized in that: The sum L1 of the lengths of the base portion (100) and the deformation portion (300) and the circumference L of the electrode assembly (50) satisfy the following relationship: 0mm≤L-L1≤3mm.
5. The adhesive tape sheet according to claim 1, characterized in that: The adhesive tape sheet (10) further comprises an overlap portion (500), and the overlap portion (500) is connected to an end of the deformation portion (300) away from the base portion (100), and is used to adhere to the base portion (100).
6. The adhesive tape sheet according to claim 5, characterized in that: The sum L2 of the lengths of the base portion (100), the deformation portion (300) and the overlap portion (500) and the circumference L of the electrode assembly (50) satisfy the following relationship: 0mm<L2-L≤10mm.
7. The adhesive tape sheet according to any one of claims 1 to 6, characterized in that: The deformation portion (300) is made of polyurethane or polyvinyl alcohol.
8. The adhesive tape sheet according to any one of claims 1 to 6, characterized in that: The deformation portion (300) and / or the base portion (100) are provided with ventilation holes.
9. A composite tape, characterized in that: It comprises at least two adhesive tape pieces (10) according to any one of claims 1 to 8 connected along a length direction, and any two adjacent adhesive tape pieces (10) are connected via a tearing portion.
10. A battery, characterized in that: It comprises an electrode assembly (50) and the adhesive tape sheet (10) according to any one of claims 1 to 8, wherein the adhesive tape sheet (10) is adhered to the electrode assembly (50).