Concave tab gummed paper structure and battery
The concave ear glue paper structure solves the problem of battery unevenness caused by the difference in the ear thickness, achieves the flatness and consistency of the internal structure of the battery, and improves the cycle life of the battery.
Patent Information
- Application Number
- CN202422290605.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-19
AI Technical Summary
In the prior art, the thickness difference of the lithium-ion battery ears leads to uneven pressure when the battery cell is transformed, affecting the film formation effect, and thus leading to a decrease in the battery cycle performance and shortening of the life of the battery.
The concave ear glue paper structure is adopted, including a concave ear piece and fill paper. The ear ear is arranged in the ear groove. The thickness of the ear is the same as the thickness of the glue layer. The thickness of the fill paper is equal to the sum of the thickness of the two glue layers, forming an overall flush, enhancing the flatness of the internal structure of the battery.
It improves consistency during the battery formation process, improves local lithium evolution phenomenon, and improves the cycle life of the battery and the uniformity of the internal structure.
Smart Images
Figure CN223156236U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of battery manufacturing, and in particular to a concave tab tape structure and a battery. Background Art
[0002] In the manufacturing process of lithium-ion batteries, adhesive tape is widely used to protect and fix the tabs to prevent the tabs from being damaged or short-circuited during formation and subsequent processes. However, when the uniform thickness adhesive tape used in the prior art is applied to the tabs, since the tabs themselves have a certain thickness, there is a significant height difference between the tab area and other parts of the battery cell. Figure 3 The figure shows a common core winding structure. The uneven thickness of the battery core mainly comes from the positive and negative electrodes with the tabs welded to the innermost circle. Figure 4 This is a schematic diagram of the positive and negative electrodes with the tabs welded to the innermost circle of a common winding core. It can be seen that the tabs are welded to the innermost circle of the winding core, and the tabs have a certain thickness, making the thickness distribution of the battery cell uneven from left to right, with the two tabs being the thickest. The height difference between the tab position and the non-tab position is at least one tab thickness, which is not conducive to uniform pressure on the winding core during formation. Therefore, the thickness difference is particularly prominent in the formation process of the battery cell, which can easily cause uneven local force, thereby affecting the film formation effect, and ultimately leading to a decrease in the cycle performance and shortened cycle life of the battery cell. Utility Model Content
[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a concave tab tape structure and a battery that can improve film formation consistency.
[0004] The purpose of this disclosure is achieved through the following technical solutions:
[0005] A concave tab tape structure includes a concave tape assembly, a tab and filling tape, wherein the concave tape assembly includes a first adhesive layer, a second adhesive layer and a third adhesive layer, wherein the first adhesive layer and the second adhesive layer are respectively connected to two ends of the third adhesive layer, and the first adhesive layer, the second adhesive layer and the third adhesive layer are arranged to form a tab groove, wherein the tab is arranged in the tab groove, and the thickness of the tab is the same as the thickness of the first adhesive layer and the thickness of the second adhesive layer.
[0006] The filling adhesive tape is adhered to the side of the concave adhesive tape component, and the thickness of the filling adhesive tape is equal to the sum of the thickness of the first adhesive layer and the third adhesive layer.
[0007] In one embodiment, there are multiple filling adhesive tapes, and the multiple filling adhesive tapes are respectively adhered to two sides of the concave adhesive tape component.
[0008] In one embodiment, the concave tab adhesive tape structure further includes a current collector, the tab is connected to the current collector, and the first adhesive layer and the second adhesive layer are bonded to the current collector.
[0009] In one embodiment, the concave tab adhesive tape structure further includes a current collector adhesive tape, and the current collector adhesive tape is bonded to a side surface of the current collector facing away from the tab.
[0010] In one embodiment, the concave tab adhesive tape structure further includes a positive and negative separator, the side of the third adhesive layer facing away from the current collector is bonded to the positive and negative separator, and the side of the filling adhesive tape facing away from the current collector is bonded to the positive and negative separator.
[0011] In one embodiment, the width dimension range of the tab groove is equal to the width dimension of the tab plus 0.5 mm.
[0012] In one embodiment, the thickness range of the tab is within 80 μm to 500 μm.
[0013] In one embodiment, the thickness range of the first adhesive layer and the second adhesive layer is within 80 μm to 500 μm.
[0014] In one embodiment, the thickness range of the third adhesive layer is within 12 μm to 20 μm.
[0015] A battery includes the concave tab adhesive tape structure according to any one of the above.
[0016] Compared with the prior art, the present disclosure has at least the following advantages:
[0017] 1. For the above concave tab adhesive tape structure, since the tab is arranged in the tab groove of the concave adhesive tape assembly and the filling adhesive tape is bonded to the side of the concave adhesive tape assembly, the tab, the concave adhesive tape assembly and the filling adhesive tape are bonded to form a whole. Moreover, the thickness of the tab is the same as that of the first adhesive layer and the second adhesive layer, and the thickness of the filling adhesive tape is equal to the sum of the thickness of the first adhesive layer and the thickness of the third adhesive layer. As a result, the whole is kept flush in the width extension direction of the tab, thereby reducing the non-uniformity inside the battery caused by the thickness difference at the position where the tab is located, improving the flatness of the internal structure of the battery, being beneficial to improving the consistency of the battery during the formation process, improving the local lithium plating phenomenon of the battery, and enhancing the cycle life of the battery. Description of the Drawings
[0018] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and thus 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.
[0019] Figure 1 It is a schematic structural diagram of a concave tab sticker structure of an embodiment;
[0020] Figure 2 is Figure 1 a partial structural schematic diagram of the shown concave tab sticker structure;
[0021] Figure 3 is a common core structure;
[0022] Figure 4 is a schematic diagram of the positive and negative electrode plates with tabs welded to the innermost circle of a common core. Specific Embodiments
[0023] To facilitate the understanding of the present disclosure, the following will describe the present disclosure more comprehensively with reference to the relevant accompanying drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure content of the present disclosure understood more thoroughly and comprehensively.
[0024] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiment.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0026] To better understand the technical solutions and beneficial effects of the present disclosure, the following will further describe the present disclosure in detail with specific embodiments:
[0027] Such as Figure 1 and Figure 2As shown, a concave tab adhesive tape structure 10 according to an embodiment of the present disclosure includes a concave adhesive tape assembly 100, a tab 200, and a filling adhesive tape 300. The concave adhesive tape assembly 100 includes a first adhesive layer 110, a second adhesive layer 120, and a third adhesive layer 130. The first adhesive layer 110 and the second adhesive layer 120 are respectively connected to two ends of the third adhesive layer 130. The first adhesive layer 110, the second adhesive layer 120, and the third adhesive layer 130 enclose a tab groove 1101. The tab 200 is disposed in the tab groove 1101. The thickness a of the tab 200 is the same as the thickness d of the first adhesive layer 110 and the second adhesive layer 120.
[0028] Further, the filling adhesive tape 300 is bonded to the side of the concave adhesive tape assembly 100. The thickness h of the filling adhesive tape 300 is equal to the sum of the thickness d of the first adhesive layer 110 and the thickness t of the third adhesive layer 130.
[0029] In this embodiment, since the thickness d of the first adhesive layer 110 and the second adhesive layer 120 is the same as the thickness a of the tab 200, the sum of the thickness d of the third adhesive layer 130 and the thickness d of the first adhesive layer 110 is equal to the thickness h of the filling adhesive tape 300, and the tab 200 is disposed in the tab groove 1101 formed by enclosing the first adhesive layer 110, the second adhesive layer 120, and the third adhesive layer 130, so that the edges of the tab 200, the concave adhesive tape assembly 100, and the filling adhesive tape 300 are flush in the extending direction of the width b of the tab 200. And during the battery assembly process, the concave adhesive tape assembly 100 covers the tab 200, so that the concave adhesive tape assembly 100 is closely attached to the tab 200, and at the same time, it is ensured that the edges of the concave adhesive tape assembly 100 and the filling adhesive tape 300 are flush. Thus, the filling adhesive tape 300 can balance the thickness of the tab 200 and the concave adhesive tape assembly 100, that is, the thickness at the position where the tab 200 is located is the same as the thickness at the positions on both sides where the tab 200 is not located, thereby ensuring that the thickness a of the tab 200 does not affect the overall flatness of the battery.
[0030] For the above concave tab adhesive tape structure 10, since the tab 200 is disposed in the tab groove 1101 of the concave adhesive tape assembly 100 and the filling adhesive tape 300 is bonded to the side of the concave adhesive tape assembly 100, the tab 200, the concave adhesive tape assembly 100, and the filling adhesive tape 300 are bonded to form a whole. And the thickness a of the tab 200 is the same as the thickness d of the first adhesive layer 110 and the second adhesive layer 120, and the thickness h of the filling adhesive tape 300 is equal to the sum of the thickness d of the first adhesive layer 110 and the thickness t of the third adhesive layer 130. Thus, the whole is flush in the extending direction of the width b of the tab 200, thereby reducing the non-uniformity caused by the thickness difference at the position where the tab 200 is located inside the battery, improving the flatness of the internal structure of the battery, being beneficial to improving the consistency of the battery during the formation process, improving the local lithium plating phenomenon of the battery, and enhancing the cycle life of the battery.
[0031] As Figure 1 shown, in one embodiment, the number of filling adhesive tapes 300 is multiple, and the multiple filling adhesive tapes 300 are respectively bonded to both sides of the concave adhesive tape assembly 100. In this embodiment, when the battery length is relatively long, due to the increase in the battery length, the concave adhesive tape assembly 100 may be bent or deformed when stressed, thus affecting the flatness inside the battery. If multiple filling adhesive tapes 300 are respectively bonded to both sides of the concave adhesive tape assembly 100, it can not only balance the thickness difference caused by the tab 200, but also enhance the structural strength of the concave adhesive tape assembly 100, prevent it from being bent or deformed due to the too long battery length, and further enable the concave tab adhesive tape structure 10 to maintain the flatness inside the battery.
[0032] As Figure 1 and Figure 2 shown, in one embodiment, the concave tab adhesive tape structure 10 further includes a current collector 400, the tab 200 is connected to the current collector 400, and the first adhesive layer 110 and the second adhesive layer 120 are bonded to the current collector 400. In this embodiment, during the charging and discharging process of the battery, the current enters or exits the battery through the tab, and then reaches or exits the active material area inside the battery after being collected and distributed by the current collector 400. In order to avoid short circuit of the tab 200 inside the battery, the first adhesive layer 110 and the second adhesive layer 120 are required to provide insulation protection for the tab 200. At the same time, in order to maintain the flatness inside the battery, the first adhesive layer 110 and the second adhesive layer 120 with the same thickness as the tab 200 are bonded to the current collector 400, so that the first adhesive layer 110 and the second adhesive layer 120 are flush with the tab 200 in the extending direction of its width b, thereby ensuring that the position of the tab 200 does not affect the flatness inside the battery and improving the uniformity inside the battery.
[0033] As Figure 1 shown, in one embodiment, the concave tab adhesive tape structure 10 further includes a current collector adhesive tape 500, and the current collector adhesive tape 500 is bonded to the side surface of the current collector 400 facing away from the tab 200. In this embodiment, during the operation of the battery, the current collector adhesive tape 500 provides insulation protection for the current collector 400, preventing the current collector 400 from contacting the conductive substances inside the battery, thereby avoiding the risk of short circuit inside the battery caused by the current collector 400, and thus improving the safety of the battery. Secondly, the current collector adhesive tape 500 also plays a role in fixing and supporting the current collector 400, helping to keep the position of the current collector 400 stable during the charging and discharging process, and further improving the stability of the concave tab adhesive tape structure 10.
[0034] As Figure 1As shown, in one embodiment, the concave tab adhesive tape structure 10 further includes a positive and negative separator 600. One side of the third adhesive layer 130 facing away from the current collector 400 is adhered to the positive and negative separator 600, and one side of the filling adhesive tape 300 facing away from the current collector 400 is adhered to the positive and negative separator 600. In this embodiment, the positive and negative separator 600 is adhered to one side of the third adhesive layer 130 and the filling adhesive tape 300 facing away from the current collector 400. Its function is to isolate the positive and negative tabs inside the battery, thereby preventing short circuits during the operation of the battery. At the same time, the positive and negative separator 600 also has good electrolyte wettability and ion conductivity, allowing ions in the electrolyte to freely shuttle between the positive and negative electrodes to complete the charging and discharging process of the battery, and preventing impurities and particulate matter in the electrolyte from migrating between the positive and negative electrodes, thereby maintaining the stability of the charging and discharging process of the battery.
[0035] As Figure 1 and Figure 2 shown, in one embodiment, the width w dimension range of the tab groove 1101 is equal to the width b dimension of the tab 200 plus 0.5 mm. In this embodiment, since the width w dimension range of the tab groove 1101 is 0.5 mm larger than the width b dimension of the tab 200, when the tab 200 is inserted into the tab groove 1101, it avoids mutual collision and interference between the tab 200 and the tab groove 1101 due to the insufficient width of the tab groove 1101, thereby improving the assembly efficiency of the battery.
[0036] As Figure 2 shown, in one embodiment, the thickness a range of the tab 200 is within 80 um to 500 um. In this embodiment, the tab thickness range within 80 um to 500 um can ensure that the tab 200 has a sufficient material basis to meet the requirements of the battery for the current conduction ability and mechanical strength of the tab 200 during the charging and discharging process, while effectively avoiding problems such as current interruption, overheating, or mechanical damage caused by the material being too thin, thereby improving the stability of the concave tab adhesive tape structure 10.
[0037] As Figure 2 shown, in one embodiment, the thickness d range of the first adhesive layer 110 and the second adhesive layer 120 is within 80 um to 500 um. In this embodiment, since the thicknesses of the first adhesive layer 110 and the second adhesive layer 120 are the same as the thickness a of the tab 200, the thickness d range of the first adhesive layer 110 and the second adhesive layer 120 is basically the same as the thickness a range of the tab 200. When the tab 200 is disposed in the tab groove 1101 formed by enclosing the first adhesive layer 110, the second adhesive layer 120, and the third adhesive layer 130, the tab 200 can be adapted to the thickness dimension of the tab groove 1101, thereby ensuring that the tab 200 can be flush with the first adhesive layer 110 and the second adhesive layer 120 in its width extension direction, and further improving the flatness of the internal structure of the battery.
[0038] As Figure 2 shown, in one embodiment, the thickness t of the third adhesive layer 130 ranges from 12 um to 20 um. In this embodiment, in order to ensure that the first adhesive layer 110 has sufficient mechanical strength, insulation performance, and current conduction ability, the thickness d of the first adhesive layer 110 is set to range between 12 um and 20 um. At the same time, to avoid affecting the uniformity inside the battery due to the thickness of the first adhesive layer 110, the flatness inside the battery is ensured not to be affected by the thickness d of the first adhesive layer 110.
[0039] A battery includes the concave tab adhesive paper structure 10 as described in any one of the above. In this embodiment, since the thickness d of the first adhesive layer 110 and the second adhesive layer 120 is the same as the thickness a of the tab 200, the sum of the thickness d of the third adhesive layer 130 and the first adhesive layer 110 is equal to the thickness h of the filling adhesive paper 300, and the tab 200 is disposed in the tab groove 1101 formed by enclosing the first adhesive layer 110, the second adhesive layer 120, and the third adhesive layer 130, so that the edges of the tab 200, the concave adhesive paper assembly 100, and the filling adhesive paper 300 are kept flush in the extending direction of the width b of the tab 200. And during the battery assembly process, the concave adhesive paper assembly 100 is covered on the tab, so that the concave adhesive paper assembly 100 is closely attached to the tab, and at the same time, it is ensured that the edges of the concave adhesive paper assembly 100 and the filling adhesive paper 300 are flush, so that the filling adhesive paper 300 can balance the thicknesses of the tab 200 and the concave adhesive paper assembly 100, that is, the thickness at the position where the tab 200 is located is the same as the thicknesses at the positions on both sides where the tab 200 is not located, thereby ensuring that the thickness a of the tab 200 does not affect the overall flatness of the battery.
[0040] Compared with the prior art, the present disclosure has at least the following advantages:
[0041] 1. For the above concave tab adhesive paper structure 10, since the tab 200 is disposed in the tab groove 1101 of the concave adhesive paper assembly 100, and the filling adhesive paper 300 is bonded to the side of the concave adhesive paper assembly 100, the tab 200 and the concave adhesive paper assembly 100 are bonded to the filling adhesive paper 300 to form a whole. And the thickness a of the tab 200 is the same as the thickness d of the first adhesive layer 110 and the second adhesive layer 120, and the thickness h of the filling adhesive paper 300 is equal to the sum of the thickness d of the first adhesive layer 110 and the thickness t of the third adhesive layer 130, so that the whole is kept flush in the extending direction of the width b of the tab 200. Furthermore, the non-uniformity caused by the thickness difference at the position where the tab 200 is located inside the battery is reduced, and the flatness of the internal structure of the battery is improved, which is beneficial to improving the consistency of the battery during the formation process, improving the local lithium plating phenomenon of the battery, and enhancing the cycle life of the battery.
[0042] The above-described embodiments merely represent several implementation manners of the present disclosure. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the disclosed patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.
Claims
1. A concave tab adhesive tape structure, characterized in that, It includes a concave adhesive tape assembly, tab and filling adhesive tape. The concave adhesive tape assembly includes a first adhesive layer, a second adhesive layer and a third adhesive layer. The first adhesive layer and the second adhesive layer are respectively connected to both ends of the third adhesive layer. The first adhesive layer, the second adhesive layer and the third adhesive layer enclose to form a tab groove. The tab is arranged in the tab groove, and the thickness of the tab is the same as that of the first adhesive layer and the second adhesive layer. The filling adhesive tape is bonded to the side of the concave adhesive tape assembly, and the thickness of the filling adhesive tape is equal to the sum of the thickness of the first adhesive layer and the thickness of the third adhesive layer.
2. The concave tab adhesive tape structure according to claim 1, wherein The number of the filling adhesive tapes is multiple, and the multiple filling adhesive tapes are respectively bonded to both sides of the concave adhesive tape assembly.
3. The concave tab adhesive tape structure according to claim 1, characterized in that, The concave tab adhesive tape structure further includes a current collector. The tab is connected to the current collector, and the first adhesive layer and the second adhesive layer are bonded to the current collector.
4. The concave tab adhesive tape structure according to claim 3, wherein, The concave tab adhesive tape structure further includes a current collector adhesive tape, and the current collector adhesive tape is bonded to the side of the current collector facing away from the tab.
5. The concave tab adhesive tape structure according to claim 3, wherein, The concave tab adhesive tape structure further includes a positive and negative separator. The side of the third adhesive layer facing away from the current collector is bonded to the positive and negative separator, and the side of the filling adhesive tape facing away from the current collector is bonded to the positive and negative separator.
6. The concave tab adhesive tape structure according to claim 1, wherein, The width dimension range of the tab groove is equal to the width dimension of the tab plus 0.5 mm.
7. The concave tab adhesive tape structure according to claim 1, wherein The thickness range of the tab is within 80 um to 500 um.
8. The concave tab adhesive tape structure according to claim 1, wherein, The thickness range of the first adhesive layer and the second adhesive layer is within 80 um to 500 um.
9. The concave tab adhesive tape structure according to claim 1, wherein, The thickness range of the third adhesive layer is within 12 um to 20 um.
10. A battery, characterized in that, It includes the concave tab adhesive tape structure according to any one of claims 1 to 9.