Cylindrical battery swelling adhesive tape structure and cylindrical lithium ion battery
By setting blank areas on the swelling tape and controlling relevant parameters, the alignment and deformation adaptability problems during battery winding were solved, thereby improving the stability and reliability of the battery structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-28
AI Technical Summary
The existing swelling tape for cylindrical lithium-ion batteries is prone to reduced alignment due to uneven tension or operational errors during the winding process, affecting structural stability and flatness. In addition, it lacks space to accommodate the deformation of the core, which may lead to cracking or detachment of the tape.
A blank area is set on the swelling tape, and parameters such as the width, height, area ratio and tab height ratio of the blank area are controlled to ensure tape alignment and extensibility, and to provide tolerance space to adapt to core deformation.
It improves the stability of the battery's outer diameter and the uniformity of its overall structure, enhances the battery's reliability and lifespan, avoids tape cracking or detachment, and improves production yield and battery performance.
Smart Images
Figure CN224177361U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical battery swelling tape structure and a cylindrical lithium-ion battery. Background Technology
[0002] In the field of battery manufacturing, the core is a core component, and its structural stability and safety are of paramount importance. After the core is rolled, a separator needs to be attached to the outer layer. This separator is not only flexible and can closely fit the contour of the core, providing good wrapping and fixing, but also can isolate external impurities to a certain extent. Finally, swelling tape is attached to the outside of the separator to prevent leakage of internal electrolyte.
[0003] A cylindrical lithium-ion battery with publication number CN220086141U includes a battery casing and an electrode assembly. The electrode assembly is disposed within the hollow battery casing. Electrolyte is injected into the battery casing. The electrode assembly is a wound electrode assembly. The electrode assembly includes a core and a swollen adhesive tape. The core is wound by a negative electrode sheet, a separator, and a positive electrode sheet. A separator is disposed between the negative electrode sheet and the positive electrode sheet to separate them. The core ends with a negative electrode sheet, and a swollen adhesive tape is adhered to the end of the core. Before the cylindrical lithium-ion battery is injected with electrolyte, there are gaps between the core and the inner wall of the battery casing.
[0004] The swelling tape in the above-mentioned solution lacks blank areas. During the application process, uneven tension or operational errors may lead to a decrease in alignment, affecting the flatness and stability of the overall structure. At the same time, the tape without blank areas lacks sufficient space to buffer the slight deformation of the core caused by factors such as temperature changes and charge-discharge cycles during subsequent use. This may adversely affect the tape's extensibility and even cause the tape to crack or fall off. Utility Model Content
[0005] In view of this, the present invention proposes a cylindrical battery swelling tape structure and a cylindrical lithium-ion battery. By providing a blank area on the swelling tape, the alignment and extensibility of the tape are improved.
[0006] The technical solution of this utility model is implemented as follows: Firstly, this utility model provides a cylindrical battery swelling adhesive tape structure, including a core, a separator, and a swelling adhesive tape. The separator is wound around the outside of the core, and the swelling adhesive tape is wound around the outside of the separator. The swelling adhesive tape has a blank area.
[0007] The ratio of the width L1 of the blank area of the swelling tape to the width L0 of the diaphragm satisfies: L1 / L0 = 2%-10%, and the width L1 of the blank area is 0.5-2mm.
[0008] Based on the above technical solutions, preferably, the height of the blank area is equal to the height of the swelling tape, and the height H1 of the swelling tape is 53-65mm.
[0009] Based on the above technical solutions, preferably, the ratio of the height H1 of the swelling tape to the height H0 of the diaphragm satisfies: H1 / H0=86-96%.
[0010] Based on the above technical solutions, preferably, the ratio between the area S1 of the blank area and the total area S0 of the swollen adhesive tape satisfies: S1 / S0 = 0.6-2.6%.
[0011] Based on the above technical solutions, preferably, the core has a positive electrode side tab and a negative electrode side tab, which are respectively located at both ends of the core and on both sides of the diaphragm.
[0012] Based on the above technical solutions, preferably, the ratio of the height L11 of the positive electrode side tab and / or negative electrode side tab to the height L10 of the swelling adhesive tape on the same side at the corresponding edge of the positive electrode side tab or the edge of the negative electrode side tab satisfies: L11 / L10=56-76%.
[0013] Based on the above technical solutions, preferably, the ratio of the height L12 of the positive electrode side and / or negative electrode side diaphragm extending beyond the swollen adhesive tape to the height L10 of the swollen adhesive tape extending to the corresponding positive electrode side tab edge or negative electrode side tab edge on the same side satisfies: L12 / L10=24-44%, and on the same side, L11+L12=L10.
[0014] Based on the above technical solutions, preferably, the height L11 of the positive electrode side tab and / or negative electrode side tab is 3-5mm; the height L12 of the positive electrode side and / or negative electrode side diaphragm extending beyond the swollen adhesive tape is 1.5-3.5mm.
[0015] Based on the above technical solutions, preferably, the thickness of the swelling tape is 0.02-0.05mm.
[0016] Secondly, this utility model also provides a cylindrical lithium-ion battery, including a cylindrical battery swelling tape structure.
[0017] The cylindrical battery swelling tape structure and cylindrical lithium-ion battery of this invention have the following advantages over the prior art:
[0018] (1) The blank area set on the swelling tape can prevent the swelling tape from overlapping, ensure the stability of the outer diameter of the battery, maintain the uniformity and consistency of the internal structure of the battery and the stable electrochemical performance, improve the quality and reliability of the battery, and at the same time, it can solve the problem of tape alignment, provide tolerance space for position deviation, maintain good alignment, improve production yield and appearance quality; it can also provide space for tape extension, so that it can adapt to the deformation of the core, avoid cracking or loss of adhesion, enhance the overall performance and reliability of the battery and extend its service life.
[0019] (2) By reasonably controlling multiple parameters of the swelling tape, including the width of the blank area, the ratio of its height to the diaphragm height, the ratio of the area of the blank area to the overall area, the ratio of the tab height, the ratio of the diaphragm height excess, and the thickness of the swelling tape, positional deviation and alignment problems are effectively avoided, ensuring the effective wrapping and fixing of the core by the swelling tape, preventing internal short circuits in the battery, ensuring welding reliability, maintaining the uniformity and consistency of the battery structure, improving battery performance, reliability, and safety, extending service life, and taking into account cost control and assembly efficiency, the overall performance of the battery is optimized. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the cylindrical battery swelling tape structure of this utility model;
[0022] Figure 2 This is a schematic diagram showing the blank area markings of the cylindrical battery swelling tape structure of this utility model;
[0023] Figure 3 This is a schematic diagram showing the area marking of the swollen adhesive tape in the cylindrical core and cylindrical battery of this utility model.
[0024] Figure 4 This is a schematic diagram showing the markings of the cylindrical core and the side tabs and separator of the cylindrical battery of this utility model. Detailed Implementation
[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0026] like Figure 1-4 As shown, in a first aspect, this utility model provides a cylindrical battery swelling tape structure, including a core 1, a separator 2, and a swelling tape 3. The separator 2 is wound around the outside of the core 1, and the swelling tape 3 is wound around the outside of the separator 2. The swelling tape 3 has a blank area 31, wherein the ratio of the width L1 of the blank area 31 of the swelling tape 3 to the width L0 of the separator 2 satisfies: L1 / L0 = 2%-10%, and the width L1 of the blank area 31 is 0.5-2mm.
[0027] It should be noted that if the swelling tape overlaps during battery manufacturing, it will lead to an increase in local thickness, which in turn will increase the outer diameter of the battery. This change in outer diameter may exceed the design specifications, affecting not only the compatibility of the battery with other components but also potentially having an adverse effect on the battery's performance. The blank area 31 of the swelling tape 3 ensures that the swelling tape 3 will not overlap during winding and application, thereby ensuring the stability of the battery's outer diameter. A stable outer diameter helps maintain the uniformity and consistency of the battery's internal structure, enabling the battery to maintain stable electrochemical performance during charging and discharging, thus improving the battery's quality and reliability.
[0028] Furthermore, the blank space of the swelling tape 3 effectively solves the problem of tape alignment. In actual production, due to the influence of various factors such as equipment precision, operating techniques, and material properties, the swelling tape 3 inevitably experiences certain positional deviations when being wound and applied. Without the blank space 31, these deviations may lead to uneven tape edges or even misalignment, affecting the aesthetics and structural stability of the battery. The blank space 31 provides a certain tolerance for tape alignment, accommodating these positional deviations and ensuring that the tape maintains good alignment after winding, thereby improving the battery's production yield and appearance quality.
[0029] Meanwhile, the blank area 31 provides space for the tape to extend during winding and application. During battery use, various environmental factors, such as temperature changes and charge / discharge cycles, can cause slight deformation of the core 1. The swollen tape 3 needs to have a certain degree of extensibility to accommodate these deformations, ensuring effective wrapping and protection of the core 1. The blank area 31 provided by the swollen tape 3 allows the tape to extend freely under external force without breaking or losing its adhesiveness due to excessive compression. This provides a buffer for the tape's extension, improving its adaptability and durability, thereby enhancing the overall performance and reliability of the battery and extending its lifespan.
[0030] In addition, if the size of the blank area 31 is not appropriate, the desired effect will not be achieved.
[0031] Understandably, when the blank width is too small, i.e., L1 is too small, the blank area 31 in the middle becomes very narrow. In the actual operation of wrapping and applying adhesive, due to factors such as equipment precision, operating techniques, and the characteristics of the material itself, certain positional deviations and alignment problems are inevitable. At this time, the blank area 31, which is too small, cannot effectively accommodate these deviations, and the upper and lower tapes may overlap. This overlap not only seriously affects the aesthetics of the battery appearance and reduces the overall quality of the product, but also brings many adverse effects on the battery performance. From the perspective of battery structure, tape overlap will lead to an increase in local thickness, making the battery larger in the diameter direction. This change in size will break the original structural balance of the battery and affect the electrochemical reaction environment inside the battery.
[0032] Conversely, when the blank area is too large, i.e., L1 is too large, the blank area 31 in the middle becomes too spacious. One of the main functions of the swelling tape 3 during winding and application is to wrap the core 1, ensuring it doesn't unravel during processes such as roller testing. However, an excessively large blank area 31 can cause uneven distribution of the wrapping force of the swelling tape 3 on the core 1. In some areas, the tape may not adhere tightly to the core 1, resulting in a lack of effective constraint on the core 1 during roller testing. During roller testing, the battery is subjected to various external forces, such as vibration and impact. If the wrapping force of the swelling tape 3 is insufficient, the core 1 is prone to loosening or even unraveling under these external forces, increasing the probability of cell failure. Once the cell fails, the battery cannot pass the test and cannot meet the requirements of actual use. Furthermore, an excessively large blank area 31 may also affect the overall structural stability of the battery, reducing its vibration and impact resistance, further impacting its performance and reliability.
[0033] This embodiment ensures that the swelling tape 3 can effectively avoid positional deviation and alignment problems by reasonably controlling the width range of the blank area 31 of the swelling tape 3, and can give full play to its role in wrapping the core 1, thereby improving the performance and reliability of the battery.
[0034] Specifically, in this embodiment, the width of the diaphragm 2 is L0 = 20.35 mm; the width of the blank area 31 is L1 = 1 mm; and the ratio of the width of the blank area 31 L1 of the swelling tape 3 to the width of the diaphragm 2 is L1 / L0 = 4.9%.
[0035] In this embodiment, the height of the blank area 31 is equal to the height of the swelling tape 3, and the height H1 of the swelling tape 3 is 53-65mm.
[0036] In this embodiment, the ratio of the height H1 of the swelling tape 3 to the height H0 of the diaphragm 2 satisfies: H1 / H0 = 86-96%.
[0037] It should be noted that the ratio of the height H1 of the swelling tape 3 to the height H0 of the diaphragm 2 being too large or too small has adverse effects.
[0038] When the ratio of the height of the swelling tape 3 to the height of the separator 2 is too small, it means that the coverage area of the swelling tape 3 is too small. If the coverage area is too small, especially at the top and bottom ends, the coverage of the swelling tape 3 is insufficient, and it cannot provide enough binding force. During the roller test, the battery will be subjected to various external forces such as vibration and impact. Due to the insufficient coverage of the swelling tape 3 at the top and bottom ends, the core 1 is prone to loosening or even unraveling under these external forces. The unraveling of the core 1 will cause frequent pulling at the welding points with the positive and negative current collectors. This frequent pulling will cause metal fatigue at the welding points, leading to weld breakage. Weld breakage will seriously affect the electrical connection of the battery, reduce the battery's conductivity, decrease the battery's performance, and may even lead to battery failure. Therefore, a small height ratio range will pose a serious threat to welding reliability and affect the quality and stability of the battery.
[0039] When the ratio of the height of the swelling tape 3 to the height of the separator 2 is too large, it will bring a series of cost and performance problems. The amount of swelling tape 3 used will increase significantly, which will increase the manufacturing cost of the cell. In addition, since the swelling tape 3 occupies more space, the amount of electrolyte injected will also increase accordingly, which will reduce the overall energy density of the battery.
[0040] Understandably, by reasonably controlling the ratio range of the height of the swelling tape 3 to the height of the diaphragm 2, it is ensured that the swelling tape 3 can provide sufficient coverage and fixation while avoiding increased costs and decreased energy density.
[0041] Specifically, in this embodiment, the height of the diaphragm 2 is H0 = 65 mm; the height of the swelling tape 3 is H1 = 60 mm; and the ratio of the height of the swelling tape 3 H1 to the height of the diaphragm 2 H0 is H1 / H0 = 92%.
[0042] In this embodiment, the ratio between the area S1 of the blank area 31 and the total area S0 of the swollen adhesive tape 3 satisfies: S1 / S0 = 0.6-2.6%.
[0043] It should be noted that the adverse effects of an excessively large or small ratio between the area S1 of the blank area 31 and the total area S0 of the swollen adhesive tape 3 should be considered.
[0044] When the ratio of the area of the blank area 31 to the total area of the swelling tape 3 is too small, the small blank area 31 cannot effectively accommodate the positional deviation, resulting in the upper and lower tapes overlapping. This not only damages the neatness and aesthetics of the battery appearance and reduces the perceived quality of the product, but also has a negative impact on the battery's performance. Structurally, tape overlap leads to an increase in local thickness, making the battery larger in the diameter direction; it breaks the original structural balance of the battery and affects the electrochemical reaction environment inside the battery.
[0045] When the ratio of the area of the blank area 31 to the total area of the swelling tape 3 is too large, that is, when the area of the blank area 31 in the middle is too large, the excessively large blank area 31 will cause the adhesion force of the swelling tape 3 to the core 1 to be unevenly distributed. The tape in some areas may not be able to adhere tightly to the core 1, resulting in the core 1 lacking effective constraint during the roller test; thus increasing the probability of cell failure.
[0046] It is understandable that by reasonably controlling the ratio between the area S1 of the blank area 31 and the overall area S0 of the swelling tape 3, the swelling tape can effectively avoid positional deviation and alignment problems, and fully play its role in wrapping the core 1, thereby improving the performance and stability of the battery.
[0047] Specifically, in this embodiment, the total area of the swelling tape 3 completely covering a circumference is S0 = 3834 mm². 2 The area S1 of the blank area 31 is S1 = 60 mm. 2 The ratio between the area S1 of the blank area 31 and the total area S0 of the swollen adhesive tape 3 is S1 / S0 = 1.56%.
[0048] In this embodiment, the core 1 has a positive electrode side tab 11 and a negative electrode side tab 12. The positive electrode side tab 11 and the negative electrode side tab 12 are respectively disposed at both ends of the core 1 and located on both sides of the diaphragm 2. The swelling adhesive tape 3 is disposed at the center of the diaphragm 2 in the height direction.
[0049] In this embodiment, the ratio of the height L11 of the positive electrode side tab 11 and / or the negative electrode side tab 12 to the height L10 of the same side swelling tape 3 to the edge of the corresponding positive electrode side tab 11 or negative electrode side tab 12 satisfies: L11 / L10=56-76%.
[0050] In this embodiment, the height L11 of the positive electrode side tab 11 and / or the negative electrode side tab 12 is 3-5mm.
[0051] It should be noted that the adverse effects of the ratio of the height L11 of the positive electrode side tab 11 and / or the negative electrode side tab 12 to the height L10 of the same side swelling tape 3 to the edge of the corresponding positive electrode side tab 11 or negative electrode side tab 12 being too large or too small.
[0052] When the ratio of the height of the positive / negative electrode tabs to the height of the swollen adhesive tape 3 on the same side to the tabs is too small, the foil at L11 needs to be flattened in the next process of the core 1. Because L11 is too small, the flattened layer will also be too small. During laser welding of the current collector and the flattened layer, the small flattened layer cannot provide sufficient buffering and protection. The high temperature generated during laser welding may penetrate the flattened layer and directly burn the separator 2. The separator 2 plays a crucial role in isolating the positive and negative electrodes and preventing short circuits in the battery. Once the separator 2 is burned, its insulation performance will be damaged, increasing the risk of internal short circuits in the battery and severely reducing the battery's safety performance.
[0053] When the ratio of the height of the positive / negative electrode tabs to the height of the same-side swollen adhesive tape 3 to the tabs is too large, the foil material selected for the core 1 becomes wider. This is because a larger foil area is needed to accommodate the taller tabs, which increases the cost of raw materials. In addition, during the flattening process, the thickness of the flattening will also become thicker due to the large size of L11. A thicker flattening layer will increase the difficulty of flattening, making the flattening process more complex and time-consuming. This will not only reduce manufacturing efficiency but also affect the quality of flattening, thereby affecting the overall performance and reliability of the battery.
[0054] It is understandable that by reasonably controlling the ratio of the height L11 of the positive electrode side tab 11 and / or the negative electrode side tab 12 to the height L10 of the same side swelling tape 3 to the corresponding positive electrode side tab 11 or negative electrode side tab 12, the leveling layer can be ensured to provide sufficient protection without increasing the cost and manufacturing difficulty excessively.
[0055] Specifically, in this embodiment, the height L11 of the positive electrode side tab 11 and / or the negative electrode side tab 12 is 4mm, the height L10 of the same side swelling tape 3 to the corresponding positive electrode side tab 11 or negative electrode side tab 12 is 6.5mm, and the ratio of the height L11 of the positive electrode side tab 11 and / or the negative electrode side tab 12 to the height L10 of the same side swelling tape 3 to the corresponding positive electrode side tab 11 or negative electrode side tab 12 is L11 / L10 = 61.5%.
[0056] In this embodiment, the ratio of the height L12 of the positive and / or negative electrode diaphragm 2 extending beyond the swelling tape 3 to the height L10 of the swelling tape 3 on the same side to the edge of the corresponding positive electrode tab 11 or negative electrode tab 12 satisfies: L12 / L10=24-44%, and on the same side, L11+L12=L10.
[0057] In this embodiment, the height L12 of the positive and / or negative electrode side diaphragm 2 extending beyond the swollen adhesive tape 3 is 1.5-3.5 mm.
[0058] It should be noted that the adverse effects of the ratio of the height L12 of the positive electrode side and / or negative electrode side diaphragm 2 extending beyond the swelling tape 3 to the height L10 of the swelling tape 3 on the same side to the corresponding positive electrode side tab 11 or negative electrode side tab 12 being too large or too small.
[0059] When the ratio of the height of the positive / negative electrode side separator 2 to the corresponding height of the swelling tape 3 on the same side is too small, the excessively small L12 makes it easy for gaps or loose wrapping to appear in the separator 2 when wrapping the positive and negative electrodes, increasing the risk of direct contact between the positive and negative electrodes. Once the positive and negative electrodes come into direct contact, it will cause a short circuit in the battery, which will not only affect the battery performance, but may also lead to serious consequences such as overheating, combustion, or even explosion, greatly reducing the safety and reliability of the battery.
[0060] When the ratio of the height of the positive / negative electrode side separator 2 to the corresponding height of the swelling adhesive tape 3 on the same side is too large, on the one hand, the excessive height of the separator 2 may prevent the welding equipment from accurately aligning with the flattened layer, resulting in welding position deviation or weak welding, thereby reducing welding quality; on the other hand, the high temperature generated during the welding process may burn the separator 2, damaging the structure and performance of the separator 2; damage to the separator 2 will further affect the safety performance of the battery, increase the risk of internal short circuits in the battery, and shorten the battery's service life.
[0061] It is understandable that by reasonably controlling the ratio of the height L12 of the positive and / or negative electrode side separator 2 extending beyond the swelling tape 3 to the height L10 of the same side swelling tape 3 to the corresponding positive electrode side tab 11 or negative electrode side tab 12, the separator 2 can effectively wrap the positive and negative electrodes, while avoiding interference with the welding process, thereby improving the overall performance and safety of the battery.
[0062] Specifically, in this embodiment, the height L12 of the positive electrode side and / or negative electrode side diaphragm 2 extending beyond the swelling tape 3 is 2.5 mm, and the ratio of the height L12 of the positive electrode side and / or negative electrode side diaphragm 2 extending beyond the swelling tape 3 to the height L10 of the same side swelling tape 3 to the corresponding positive electrode side tab 11 or negative electrode side tab 12 is L12 / L10 = 2.5 / 6.5 = 38.5%.
[0063] In this embodiment, the thickness of the swelling tape 3 is 0.02-0.05 mm.
[0064] It should be noted that excessively large or small thicknesses of the swelling tape 3 can have adverse effects.
[0065] When the thickness of the swelling tape 3 is too small, the swelling rate of the swelling tape 3 will decrease significantly, and there will be insufficient swelling volume to help fix the core in the casing. During battery use, especially in high-frequency vibration environments, if the swelling tape 3 does not have sufficient swelling volume, the core will easily shake at high frequency in the casing. This shaking will generate frequent pulling forces on the solder marks of the positive and negative current collectors at the top and bottom, causing the metal structure at the weld to gradually deteriorate, resulting in a decrease in welding reliability. This pulls on the solder marks of the positive and negative current collectors at the top and bottom, reducing welding reliability and affecting the battery's lifespan and safety.
[0066] When the thickness of the swelling tape 3 is too large, it will cause difficulties in assembly. After the swelling tape 3 covers the core 1, its size in the diameter direction increases, which increases the overall outer diameter of the core 1. This makes it difficult to insert the core 1 into the shell, and the insertion process becomes difficult. The increase in assembly difficulty will not only increase the operational complexity in the production process, but also reduce assembly efficiency.
[0067] Understandably, by reasonably controlling the thickness range of the swelling tape 3, it is possible to ensure the stable fixation of the core 1 within the casing, while also facilitating battery assembly and production.
[0068] Specifically, in this embodiment, the thickness of the swelling tape 3 is 0.03 mm.
[0069] Secondly, this utility model also provides a cylindrical lithium-ion battery, including a cylindrical battery swelling tape structure.
[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A cylindrical battery swelling tape structure, characterized in that, The assembly includes a core (1), a diaphragm (2), and a swelling adhesive tape (3). The diaphragm (2) is wound around the outside of the core (1), and the swelling adhesive tape (3) is wound around the outside of the diaphragm (2). The swelling adhesive tape (3) has a blank area (31). The ratio of the width L1 of the blank area (31) of the swelling tape (3) to the width L0 of the diaphragm (2) satisfies: L1 / L0 = 2%-10%, and the width L1 of the blank area (31) is 0.5-2mm.
2. The cylindrical battery swelling tape structure as described in claim 1, characterized in that: The height of the blank area (31) is equal to the height of the swelling tape (3), and the height H1 of the swelling tape (3) is 53-65mm.
3. The cylindrical battery swelling tape structure as described in claim 2, characterized in that: The ratio of the height H1 of the swelling tape (3) to the height H0 of the diaphragm (2) satisfies: H1 / H0 = 86-96%.
4. The cylindrical battery swelling tape structure as described in claim 1, characterized in that: The ratio between the area S1 of the blank area (31) and the total area S0 of the swollen adhesive tape (3) satisfies: S1 / S0 = 0.6-2.6%.
5. The cylindrical battery swelling tape structure as described in claim 1, characterized in that: The core (1) has a positive electrode side tab (11) and a negative electrode side tab (12), which are located at both ends of the core (1) and on both sides of the diaphragm (2).
6. The cylindrical battery swelling tape structure as described in claim 5, characterized in that: The ratio of the height L11 of the positive electrode side tab (11) and / or the negative electrode side tab (12) to the height L10 of the same side swelling tape (3) to the edge of the corresponding positive electrode side tab (11) or negative electrode side tab (12) satisfies: L11 / L10=56-76%.
7. The cylindrical battery swelling tape structure as described in claim 6, characterized in that: The ratio of the height L12 of the positive and / or negative electrode side diaphragm (2) extending beyond the swollen adhesive tape (3) to the height L10 of the swollen adhesive tape (3) on the same side to the edge of the corresponding positive electrode tab (11) or negative electrode tab (12) satisfies: L12 / L10=24-44%, and on the same side, L11+L12=L10.
8. The cylindrical battery swelling tape structure as described in claim 7, characterized in that: The height L11 of the positive electrode side tab (11) and / or the negative electrode side tab (12) is 3-5 mm; the height L12 of the portion of the positive electrode side and / or the negative electrode side diaphragm (2) extending beyond the swollen adhesive tape (3) is 1.5-3.5 mm.
9. The cylindrical battery swelling tape structure as described in claim 1, characterized in that: The thickness of the swelling tape (3) is 0.02-0.05 mm.
10. A cylindrical lithium-ion battery, characterized in that: Includes the cylindrical battery swelling tape structure as described in any one of claims 1-9.
Citation Information
Patent Citations
Cylindrical lithium ion battery
CN220086141U