Winding core fixing assembly for semi-solid lithium battery, winding core structure and semi-solid lithium battery
By setting a matrix of vent holes and a preset blank gap on the outer peripheral wall of the expansion ring, the problem of poor pressure release in silicon-based anode semi-solid lithium batteries with high expansion rate is solved, achieving rapid release of expansion pressure, avoiding deformation and enhancing the fixing effect.
Patent Information
- Application Number
- CN202520863377.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-06-19
- Estimated Expiration
- 2035-04-30
AI Technical Summary
In existing technologies, semi-solid lithium batteries with silicon-based anodes that have a high expansion rate can expand by up to 300% during charge-discharge cycles, which makes the cell structure prone to deformation. Traditional expansion tapes cannot effectively release the expansion pressure.
Design a core fixing component, including an expansion rubber ring and a release film stacked in sequence. The outer peripheral wall of the expansion rubber ring forms multiple matrix-distributed vent holes, with the vent hole ratio being 20%-40% and the hole diameter decreasing. Combined with a preset blank gap, it is used to quickly release the expansion pressure.
It effectively avoids core deformation caused by expansion pressure, ensures that the expansion ring releases pressure evenly, prevents local deformation, and enhances the fixing effect and structural strength.
Smart Images
Figure CN224377363U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of semi-solid lithium battery technology, and in particular to a core fixing assembly, core structure and semi-solid lithium battery for use in a semi-solid lithium battery. Background Technology
[0002] Typically, there is a gap between the battery cell and the metal casing of a lithium battery. If this gap is not filled, the cell can shift under significant external vibration or impact, leading to electrode deformation or desoldering of the tabs. Therefore, commercially available lithium batteries usually incorporate expansion tape in this gap to effectively prevent cell movement.
[0003] Semi-solid-state lithium batteries, as a common form of lithium battery, exhibit higher safety compared to liquid lithium batteries, and are therefore widely favored in the current market. Because semi-solid-state lithium batteries have a wider operating temperature range (-30℃ to 100℃), the thermal stability of the expanding adhesive used with them is required to be higher. For example, the expanding adhesive tape for lithium batteries and its preparation method described in Chinese patent document CN115851151B are composites of a base layer and an adhesive layer. By modifying the polymer base of the base layer, the temperature resistance and swelling rate of the expanding adhesive tape are significantly improved, allowing the tape to absorb electrolyte and expand to firmly fix the lithium battery in the electrolyte.
[0004] Although the aforementioned expansion tape can effectively fix the battery cell, for some semi-solid-state lithium batteries with silicon-based anodes that have a high expansion rate, the expansion rate can reach as high as 300% during charge-discharge cycles. This results in a large internal expansion pressure within the restricted battery cell, which can easily cause the battery cell structure to deform. Utility Model Content
[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a core fixing component, core structure and semi-solid lithium battery for a semi-solid lithium battery that can quickly release the internal expansion pressure of the core to reduce the risk of core deformation due to expansion pressure, and also reduce the risk of deformation of the expansion rubber ring.
[0006] The purpose of this disclosure is achieved through the following technical solution:
[0007] A core fixing assembly for a semi-solid-state lithium battery includes an expansion ring and a release film stacked sequentially, wherein the release film is peelably disposed on the inner sidewall of the expansion ring.
[0008] The outer peripheral wall of the expansion ring is formed with multiple vent holes, which are distributed in a matrix.
[0009] The expansion ring includes a first adhesive part, a winding part, and a second adhesive part. The first adhesive part is connected to the second adhesive part through the winding part, and together they form a closed annular mounting cavity, which is used to accommodate the core.
[0010] In one embodiment, the total area of all the vent holes is 20%-40% of the area of the expansion ring.
[0011] In one embodiment, the pore size of the vent decreases sequentially from the end closer to the release film to the end farther away from the release film.
[0012] In one embodiment, the pore size of the vent is 0.1 μm-1 μm; and / or,
[0013] The spacing between each vent is 5mm-20mm.
[0014] In one embodiment, the thickness of the expansion ring is 35μm-80μm.
[0015] In one embodiment, the second adhesive portion is fixed to the second adhesive portion by a first adhesive layer.
[0016] In one embodiment, the first adhesive portion includes a first base layer and a second adhesive layer stacked sequentially; and / or,
[0017] The winding portion includes a second base layer and a third adhesive layer stacked sequentially; and / or,
[0018] The second adhesive portion includes a third base layer and a fourth adhesive layer stacked sequentially.
[0019] A core structure includes a core and a core fixing assembly for a semi-solid lithium battery as described in any of the above embodiments. The core fixing assembly is sleeved on the outer peripheral wall of the core through a closed annular mounting cavity. The two side walls of the expansion ring of the core fixing assembly form a preset blank gap with the two side ends of the core.
[0020] In one embodiment, the ratio of the height of the preset blanking gap to the height of the core is (1-2):20; and / or,
[0021] The core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence, wherein the negative electrode sheet includes a silicon-based composite layer.
[0022] A semi-solid-state lithium battery includes the core structure described in any of the above embodiments.
[0023] Compared with the prior art, this disclosure has at least the following advantages:
[0024] 1) The core fixing assembly includes an expansion ring and a release film stacked in sequence. The release film can be peeled off the inner wall of the expansion ring, allowing the operator to tear it off during use. When not in use, the release film effectively prevents dust from entering, thus ensuring the adhesive performance of the expansion ring. The outer peripheral wall of the expansion ring has multiple vent holes, which can quickly release the internal expansion pressure of the core. This released pressure flows out from the explosion-proof components of the semi-solid lithium battery, effectively regulating the internal expansion pressure of the core and avoiding the deformation problem caused by excessive expansion pressure in traditional cores.
[0025] 2) Because the vents are distributed in a matrix, the vents are evenly distributed in the expansion ring. This ensures that the expansion ring can quickly release the internal expansion pressure of the core in 360°, while also avoiding the problem of deformation of the expansion ring caused by uneven distribution of vents leading to localized large expansion pressure. Attached Figure Description
[0026] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the core structure of an embodiment of the present invention from one direction;
[0028] Figure 2 This is a schematic diagram of the core structure of one embodiment of the present invention from another direction;
[0029] Figure 3 for Figure 2 The enlarged view shown at point A is shown below.
[0030] Figure 4 This is a partial structural diagram of a core fixing assembly according to an embodiment of the present invention, taken from one direction.
[0031] Reference numerals: 10, core fixing assembly; 100, expansion ring; 110, vent hole; 120, closed annular mounting cavity; 130, first adhesive part; 131, first base layer; 132, second adhesive layer; 140, winding part; 150, second adhesive part; 160, first adhesive layer; 200, release film; 20, core structure; 21, core; 22, preset blanking gap. Detailed Implementation
[0032] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0034] 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 disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0035] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:
[0036] Please see Figures 1 to 3 An embodiment of a core fixing assembly 10 for a semi-solid lithium battery includes an expansion ring 100 and a release film 200 stacked sequentially. The release film 200 is peelably disposed on the inner sidewall of the expansion ring 100, allowing the operator to tear off the release film 200 during use. When not in use, the release film 200 effectively prevents dust from entering, thereby effectively ensuring the adhesive performance of the expansion ring 100. The outer peripheral wall of the expansion ring 100 has a plurality of vent holes 110 formed through it, and the vent holes 110 are arranged in a matrix. The expansion ring 100 includes a first adhesive part 130, a winding part 140, and a second adhesive part 150. The first adhesive part 130 is connected to the second adhesive part 150 through the winding part 140, and together they form a closed annular mounting cavity 120 for receiving the core 21.
[0037] It should be noted that although traditional expansion tape has a certain porosity, which can release expansion pressure to some extent, for some semi-solid lithium batteries with silicon-based anodes that have a high expansion rate, the porosity of the expansion tape itself is still insufficient to quickly release the expansion pressure of the core 21.
[0038] Therefore, in this disclosure, by forming multiple vent holes 110 through the outer peripheral wall of the expansion ring 100, the additional multiple vent holes 110 can release the internal expansion pressure of the core 21 more quickly, and these released expansion pressures will flow out from the explosion-proof components of the semi-solid lithium battery, thereby better regulating the internal expansion pressure of the core 21 and effectively avoiding the problem of deformation caused by the large expansion pressure of the traditional core 21.
[0039] It can also be understood that since the ventilation holes 110 are distributed in a matrix, the multiple ventilation holes 110 are evenly distributed in the expansion ring 100. This ensures that the expansion ring 100 can quickly release the internal expansion pressure of the core 21 in 360°, while also avoiding the problem of deformation of the expansion ring 100 due to uneven distribution of ventilation holes 110 causing localized large release of expansion pressure.
[0040] It is understandable that if the proportion of each vent 110 in the expansion ring 100 is too large, the expansion ring 100 will not be able to fix the expansion core 21 well; if the proportion of each vent 110 in the expansion ring 100 is too small, the internal expansion pressure of the core 21 cannot be released quickly, resulting in the core 21 still deforming. Therefore, in one embodiment, the total area of each vent 110 to the area of the expansion ring 100 is 20%-40% to ensure that the proportion of each vent 110 in the expansion ring 100 is appropriate. In this way, while achieving good fixation of the expansion core 21, it is also ensured that the expansion ring 100 can quickly release the internal expansion pressure of the core 21, so as to effectively reduce the problem of expansion deformation of the core 21.
[0041] In one embodiment, the porosity of the expansion ring 100 is 60%-70% to ensure that the expansion ring 100 itself has good swelling rate and air permeability. In particular, when used in conjunction with the fact that the total area of each of the air vents 110 is 20%-40% of the area of the expansion ring 100, the overall structure of the expansion ring 100 is well ensured, thereby achieving better fixation of the expansion core 21 and ensuring that the expansion ring 100 can quickly release the internal expansion pressure of the core 21, so as to effectively reduce the problem of expansion deformation of the core 21.
[0042] In one embodiment, the aperture size of the vent 110 decreases sequentially from the end closer to the release film 200 to the end farther away from the release film 200. This not only helps to optimize the air permeability of the expansion ring 100 to quickly release the expansion pressure of the core 21, but also enhances the structural strength of the expansion ring 100, enabling it to more effectively fix the expansion core 21 during expansion and prevent unnecessary displacement or deformation.
[0043] In one embodiment, the pore diameter of the vent 110 is 0.1μm-1μm; especially when combined with the spacing of each vent 110 being 5mm-20mm and the thickness of the expansion ring 100 being 35μm-80μm, it is ensured that the distribution of each vent 110 within the expansion ring 100 is more appropriate, effectively avoiding the problem that the expansion ring 100 is prone to breakage during the expansion process due to improper distribution of the vent 110.
[0044] In one embodiment, the second adhesive portion 150 is fixed to the second adhesive portion 150 by a first adhesive layer 160, so as to achieve adhesive fixation between the first adhesive portion 130 and the second adhesive portion 150, thereby ensuring that the second adhesive portion 150, the first adhesive layer 160 and the winding portion 140 can be connected to form a closed annular mounting cavity 120, thereby achieving the fixation of the core 21.
[0045] like Figure 4 As shown, in one embodiment, the first adhesive portion 130 includes a first base layer 131 and a second adhesive layer 132 stacked sequentially to achieve adhesive fixation between the first adhesive portion 130 and the outer peripheral wall of the core 21. Similarly, the winding portion 140 includes a second base layer and a third adhesive layer stacked sequentially to achieve adhesive fixation between the winding portion 140 and the outer peripheral wall of the core 21. The second adhesive portion 150 includes a third base layer and a fourth adhesive layer stacked sequentially to achieve adhesive fixation between the second adhesive portion 150 and the outer peripheral wall of the core 21.
[0046] Of course, in order to improve the structural strength of the expansion ring 100, in one embodiment, the first base layer 131, the second base layer, and the third base layer are integrally molded structures, that is, the first base layer 131, the second base layer, and the third base layer are directly injection molded from polymer materials. Specifically, the polymer materials include any one of copolyacrylonitrile-methyl acrylate, thermoplastic polyurethane, polyolefins, and polyamides.
[0047] It should be noted that copolyacrylonitrile-methyl acrylate, thermoplastic polyurethane, polyolefins and polyamides are known materials, and this disclosure only protects the connection relationship between the first base layer 131, the second base layer and the third base layer.
[0048] like Figures 1 to 3As shown, this disclosure also provides a core structure 20, including a core 21 and a core fixing assembly 10 for a semi-solid lithium battery as described in any of the above embodiments. The core fixing assembly 10 is sleeved on the outer peripheral wall of the core 21 through a closed annular mounting cavity 120. The two side walls of the expansion ring 100 of the core fixing assembly 10 form a preset blank gap 22 with the two side ends of the core 21, respectively. The added blank gap can provide better stress release for the expansion of the core 21, effectively avoiding the problem that the core 21 will deform during the expansion process due to the inability to release stress because the expansion ring 100 completely binds the core 21.
[0049] In one embodiment, the ratio of the height of the preset blank gap 22 to the height of the core 21 is (1-2):20; to ensure that the distribution of the expansion ring 100 on the core 21 is more suitable, and to provide better stress release for the expansion of the core 21 while achieving better fixation.
[0050] In one embodiment, the core 21 is formed by winding a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence. The negative electrode sheet includes a silicon-based composite layer. The added expansion ring 100 can better restrain the semi-solid lithium battery with silicon-based negative electrode and effectively avoid the problem of deformation of the core 21 due to excessive expansion pressure.
[0051] This disclosure also provides a semi-solid-state lithium battery, including the core structure 20 described in any of the above embodiments.
[0052] Compared with the prior art, this disclosure has at least the following advantages:
[0053] 1) Since the core fixing assembly 10 includes an expansion ring 100 and a release film 200 stacked in sequence, the release film 200 can be peeled off and disposed on the inner side wall of the expansion ring 100, so that the operator can tear off the release film 200 when using it, and when not in use, the release film 200 can effectively block the entry of dust, so as to effectively ensure the adhesive performance of the expansion ring 100; since the outer peripheral wall of the expansion ring 100 has multiple vent holes 110 through it, the additional multiple vent holes 110 can release the internal expansion pressure of the core 21 more quickly, and these released expansion pressures will flow out from the explosion-proof components of the semi-solid lithium battery, thereby better regulating the internal expansion pressure of the core 21 and effectively avoiding the problem of deformation caused by the large expansion pressure of the traditional core 21.
[0054] 2) Since the ventilation holes 110 are distributed in a matrix, the multiple ventilation holes 110 are evenly distributed in the expansion ring 100. This ensures that the expansion ring 100 can quickly release the internal expansion pressure of the core 21 in 360°, while also avoiding the problem of deformation of the expansion ring 100 due to uneven distribution of ventilation holes 110 causing local large release of expansion pressure.
[0055] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A core fixing assembly for a semi-solid-state lithium battery, the core fixing assembly comprising an expansion ring and a release film stacked sequentially, the release film being peelable and disposed on the inner sidewall of the expansion ring, characterized in that, The outer peripheral wall of the expansion ring is formed with multiple vent holes, which are distributed in a matrix. The expansion ring includes a first adhesive part, a winding part, and a second adhesive part. The first adhesive part is connected to the second adhesive part through the winding part, and together they form a closed annular mounting cavity, which is used to accommodate the core.
2. The winding core fixing assembly for a semi-solid-state lithium battery according to claim 1, characterized in that, The total area of all the vent holes accounts for 20%-40% of the area of the expansion ring.
3. The winding core fixing assembly for a semi-solid lithium battery according to claim 1, characterized in that, The size of the vent holes decreases sequentially from the end closer to the release film to the end farther away from the release film.
4. The winding core fixing assembly for a semi-solid-state lithium battery according to claim 1, characterized in that, The pore size of the vent is 0.1μm-1μm; and / or, The spacing between each vent is 5mm-20mm.
5. The winding core fixing assembly for a semi-solid-state lithium battery according to claim 1, characterized in that, The thickness of the expansion ring is 35μm-80μm.
6. The winding core fixing assembly for a semi-solid-state lithium battery according to claim 1, characterized in that, The second adhesive portion is fixed to the second adhesive portion by the first adhesive layer.
7. The winding core fixing assembly for a semi-solid-state lithium battery according to claim 1, characterized in that, The first adhesive portion includes a first base layer and a second adhesive layer stacked sequentially; and / or, The winding portion includes a second base layer and a third adhesive layer stacked sequentially; and / or, The second adhesive portion includes a third base layer and a fourth adhesive layer stacked sequentially.
8. A core structure, characterized in that, The invention includes a winding core and a winding core fixing assembly for a semi-solid lithium battery according to any one of claims 1-7. The winding core fixing assembly is sleeved on the outer peripheral wall of the winding core through a closed annular mounting cavity, and the two side walls of the expansion ring of the winding core fixing assembly form a preset blank gap with the two side ends of the winding core, respectively.
9. The core structure according to claim 8, characterized in that, The ratio of the height of the preset blank gap to the height of the core is (1-2):20; and / or, The core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence, wherein the negative electrode sheet includes a silicon-based composite layer.
10. A semi-solid-state lithium battery, characterized in that, Includes the core structure as described in claim 8 or 9.