An all-solid-state battery
By setting avoidance grooves at the edge of the thickness compensation layer of the all-solid-state battery and attaching the ends of the adhesive tape, the problem of uneven pressure on the surface of the all-solid-state battery was solved, resulting in a more uniform conductivity distribution, reduced short-circuit risk, and improved battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-21
AI Technical Summary
In the existing all-solid-state battery stacking process, the use of PET tape leads to uneven distribution of surface pressure, which in turn affects the conductivity distribution and increases the risk of short circuits.
An avoidance groove is set at the edge of the thickness compensation layer of the all-solid-state battery, and the end of the tape is pasted in the groove. The groove depth compensates for the thickness difference of the bare cell surface, thereby improving the uniformity of surface pressure distribution.
It effectively prevents excessive deposition of lithium ions in the tape area, reduces the risk of short circuits, and improves the rate and cycle performance of the battery.
Smart Images
Figure CN224537090U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of all-solid-state battery technology, and specifically to an all-solid-state battery. Background Technology
[0002] The distribution of surface conductivity in all-solid-state batteries is strongly correlated with the distribution of surface pressure. A more uniform surface pressure distribution leads to a more uniform surface conductivity distribution, which is beneficial for improving the rate capability and cycle performance of all-solid-state batteries. However, current stacking processes require the application of PET tape to bare all-solid-state batteries to prevent electrode misalignment. These PET tapes are 50–100 μm thick. When test pressure is applied, the pressure in the tape area is higher than in the normal area, resulting in uneven surface pressure distribution in the all-solid-state battery, which in turn leads to uneven surface conductivity distribution. Utility Model Content
[0003] In view of this, this application provides an all-solid-state battery that compensates for the thickness difference of the bare cell surface by providing a depth compensation layer with avoidance grooves, thereby improving the uniformity of surface pressure distribution and preventing short circuit problems caused by excessive deposition of lithium ions in the tape area.
[0004] To achieve the above objectives, this application provides the following technical solution:
[0005] An all-solid-state battery, comprising:
[0006] The battery cell has a first side and a second side that are arranged opposite to each other;
[0007] A thickness compensation layer, wherein an avoidance groove is provided at the edge of the thickness compensation layer, the thickness compensation layer includes a first thickness compensation layer respectively disposed on the first surface and a second thickness compensation layer disposed on the second surface, and the avoidance groove includes a first avoidance groove disposed on the first thickness compensation layer and a second avoidance groove disposed on the second thickness compensation layer;
[0008] The tape has one end attached to the first clearance groove along its length, and the other end attached to the second clearance groove opposite to the first clearance groove.
[0009] Optionally, the depth of the clearance groove is equal to the difference between the thickness of the tape and the thickness of the adhesive layer of the tape.
[0010] Optionally, the dimension of the thickness compensation layer in the first direction is equal to the dimension of the first surface in the first direction, and the dimension of the thickness compensation layer in the second direction is equal to the dimension of the first surface in the second direction.
[0011] Optionally, the distance between the end of the tape in the longitudinal direction and the inner edge of the clearance groove is 0 to 1 mm; and / or, the distance between the edge of the tape in the width direction and the edge of the clearance groove is 0 to 1 mm.
[0012] Optionally, the all-solid-state battery further includes an aluminum-plastic film, which is encapsulated on the thickness compensation layer and the outer periphery of the cell.
[0013] Optionally, the thickness compensation layer is separately disposed from the battery cell, and the thickness compensation layer has uniformly distributed protrusions on the surface near the battery cell.
[0014] Optionally, the thickness compensation layer has uniformly distributed protrusions on the surface away from the battery cell.
[0015] Optionally, the first thickness compensation layer and the second thickness compensation layer are integrally formed with the first surface and the second surface, respectively, and the surfaces of the first thickness compensation layer and the second thickness compensation layer are provided with uniformly distributed protrusions.
[0016] Optionally, the edge of the thickness compensation layer is provided with a chamfer, the angle of the chamfer being less than 45°; and / or, the width of the chamfer is 5 to 20 μm.
[0017] Optionally, the thickness compensation layer is made of one or more of PET, PE, PP, polyimide, and silicone rubber.
[0018] The all-solid-state battery of this application has a relief groove at the edge of its thickness compensation layer, and the end of the tape along its length is pasted into the relief groove. In this way, the depth of the relief groove can offset the thickness of the tape itself. Thus, by setting a depth compensation layer with relief grooves, the thickness difference of the bare cell surface is compensated, thereby improving the uniformity of surface pressure distribution and preventing short circuit problems caused by excessive deposition of lithium ions in the tape area. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0020] Figure 1 A top view of an existing all-solid-state battery.
[0021] Figure 2 A side view of a conventional all-solid-state battery;
[0022] Figure 3 This is a top view of the all-solid-state battery of this application;
[0023] Figure 4 This is a side view of the all-solid-state battery of this application;
[0024] Figure 5 This is a cross-sectional schematic diagram of a thickness compensation layer printed on the surface of an all-solid-state battery using 3D printing technology.
[0025] exist Figures 1-5 middle:
[0026] 1. Battery cell; 11. Positive electrode tab; 12. Negative electrode tab; 2. Adhesive tape; 3. Thickness compensation layer. Detailed Implementation
[0027] This application provides an all-solid-state battery that uses a depth compensation layer with clearance grooves to compensate for the thickness difference of the bare cell surface, thereby improving the uniformity of surface pressure distribution and preventing short circuit problems caused by excessive deposition of lithium ions in the tape area.
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0029] like Figures 1-2 As shown, in existing all-solid-state batteries, multiple adhesive tapes 2 are evenly distributed on the cell 1. One end of these adhesive tapes 2 is attached to the first surface and the other end is attached to the second surface, which can prevent the electrode from being misaligned. Due to the thickness of the adhesive tapes 2 themselves, the surface pressure distribution of the all-solid-state battery is easily uneven, which further leads to uneven surface conductivity distribution of the all-solid-state battery.
[0030] like Figures 3-4 As shown, this application provides an all-solid-state battery, comprising:
[0031] The battery cell 1 has a first side and a second side arranged opposite to each other, that is, the front and back sides of the battery cell 1. One end of the battery cell 1 is provided with a positive electrode tab 11 and a negative electrode tab 12.
[0032] Thickness compensation layer 3, with an avoidance groove at its edge, the thickness compensation layer 3 includes a first thickness compensation layer 3 respectively disposed on the first surface. Figure 3The first thickness compensation layer 1 (facing us) and the second thickness compensation layer 3 (located on the back of the cell 1, not shown) are arranged on the second surface. The clearance groove includes a first clearance groove on the first thickness compensation layer 3 and a second clearance groove on the second thickness compensation layer 3. The first thickness compensation layer 3 has 6 first clearance grooves on its edge, with two on each long side and one on each short side. Correspondingly, the second thickness compensation layer 3 has 6 second clearance grooves on its edge, with two on each long side and one on each short side.
[0033] The tape 2, preferably made of PET material, has one end attached to the first clearance groove along its length, and the other end attached to the second clearance groove opposite to the first clearance groove. The positions of the first clearance groove and the second clearance groove correspond one-to-one; that is, each first clearance groove corresponds to one second clearance groove, so that the tape 2 can better adhere to the surface of the cell 1 between the first and second surfaces, thereby making the thickness compensation layer 3 and the stacked cell 1 more firmly bonded.
[0034] The thickness compensation layer 3 has an avoidance groove at its edge, and the end of the tape 2 along its length is pasted into the avoidance groove. In this way, the depth of the avoidance groove can offset the thickness of the tape 2 itself. Thus, by setting the depth compensation layer with the avoidance groove, the thickness difference of the bare cell 1 is compensated, thereby improving the uniformity of the surface pressure distribution and preventing short circuit problems caused by excessive deposition of lithium ions in the tape 2 area.
[0035] In a preferred embodiment, the depth of the clearance groove is equal to the difference between the thickness of the tape 2 and the thickness of the adhesive layer of the tape 2.
[0036] After the battery cell 1 with the thickness compensation layer 3 is compressed, the tape 2 is also squeezed. The thickness of the tape 2 after compression is negligible, resulting in a reduction in thickness. Therefore, in order to make the actual thickness of the tape 2 after compression consistent with the depth of the relief groove, thereby minimizing the thickness difference of the battery cell 1, the depth of the relief groove is set to the difference between the thickness of the tape 2 and the thickness of the tape 2's adhesive layer, which is the actual thickness of the tape 2 after compression.
[0037] In a preferred embodiment, the thickness compensation layer 3 in the first direction ( Figure 3 The dimension of the first surface in the X direction is equal to the dimension of the first surface in the first direction, and the thickness compensation layer 3 in the second direction is equal to the dimension of the first surface in the first direction. Figure 3 The dimension of the first face in the Y direction is equal to the dimension of the second face in the second direction.
[0038] In fact, since the battery cell 1 is formed by stacked electrode sheets, the dimensions of the first and second sides are actually the dimensions of the electrode sheets. The thickness compensation layer 3 is located on the upper and lower sides of the battery cell 1, and its dimensions are consistent with the electrode sheets. In this way, the thickness compensation layer 3 can be aligned with the edge of the first or second side of the battery cell 1, so that the tape 2 can be easily and firmly adhered when pasted, preventing the electrode sheets from falling apart.
[0039] In a preferred embodiment, the distance between the end of the tape 2 in the longitudinal direction and the inner edge of the relief groove is 0 to 1 mm; and / or, the distance between the edge of the tape 2 in the width direction and the edge of the relief groove is 0 to 1 mm.
[0040] In this way, there is a gap between the end of the tape 2 in the length direction and the edge of the tape 2 in the width direction and the relief groove, or at least it will not stick to the outside of the edge of the relief groove, thus avoiding the generation of thickness difference on the bare cell 1.
[0041] In a preferred embodiment, the all-solid-state battery further includes an aluminum-plastic film, which is encapsulated around the thickness compensation layer 3 and the outer periphery of the cell 1. The aluminum-plastic film is composed of a multilayer composite material (outer nylon / middle aluminum foil / inner polypropylene), which can resist external impact, puncture and friction, and prevent damage to the structure of the cell 1.
[0042] In a preferred embodiment, the thickness compensation layer 3 is separately disposed from the battery cell 1, and the thickness compensation layer 3 has uniformly distributed protrusions on the surface near the battery cell 1.
[0043] Since the aluminum-plastic film is encapsulated on the outer periphery of the thickness compensation layer 3 and the battery cell 1, it is necessary to evacuate and degas the air. Therefore, it is necessary to ensure that the gas in the aluminum-plastic film and coating is effectively extracted during vacuuming. The thickness compensation layer 3 and the surface of the battery cell 1 are prone to sticking together and generating air bubbles that cannot be extracted. The thickness compensation layer 3 has uniformly distributed protrusions on its surface near the battery cell 1, which can maintain a certain gap between the thickness compensation layer 3 and the surface of the battery cell 1, allowing the gas to be extracted smoothly. The height of the protrusions should be <10μm, preferably 5μm, and the diameter of the protrusions should be <50μm, preferably 20μm.
[0044] In a preferred embodiment, the thickness compensation layer 3 has uniformly distributed protrusions on the surface away from the battery cell 1.
[0045] Similarly, to prevent air bubbles from forming between the thickness compensation layer 3 and the aluminum-plastic film and being unable to be extracted, the surface of the thickness compensation layer 3 away from the battery cell 1 is provided with uniformly distributed protrusions. That is, both sides of the thickness compensation layer 3 are provided with a raised dot matrix, so as to ensure that the gas between the aluminum-plastic film and the thickness compensation layer 3 is effectively extracted during vacuuming. The height of the protrusions should be <10μm, preferably 5μm, and the diameter should be <50μm, preferably 20μm.
[0046] In a preferred embodiment, such as Figure 5 As shown, the first thickness compensation layer 3 and the second thickness compensation layer 3 are integrally formed with the first surface and the second surface, respectively, and the surfaces of the first thickness compensation layer 3 and the second thickness compensation layer 3 are provided with uniformly distributed protrusions.
[0047] In this embodiment, a thickness compensation layer 3 can be printed on the surface of the battery cell 1 using 3D printing technology, which is integrally formed with the battery cell 1, directly avoiding the problem of air bubbles easily forming between the thickness compensation layer 3 and the surface of the battery cell 1.
[0048] A coating of a certain thickness and shape is printed on the surface of the bare battery cell 1 with adhesive tape 2 using 3D printing technology as a thickness compensation layer 3. The steps are as follows:
[0049] 1. Slurry Preparation: Polystyrene microspheres and SBR binder are dispersed in isobutyl isobutyrate solvent at a ratio of 80:20, with a solid content of 25%. Mechanical stirring is used to ensure uniform dispersion of the polystyrene microspheres in the isobutyl isobutyrate solvent, forming a stable slurry. The low density of the polystyrene microspheres is beneficial for maintaining the energy density of the all-solid-state battery. The particle size of the polystyrene microspheres is 200–1000 nm, preferably 600 nm.
[0050] 2. The slurry from step 2 is applied to bare cell 1 using a 3D printer, and a dry film is obtained by heating at 80°C.
[0051] 3. The distance between the membrane and the edge of the battery cell 1 is 0-1 mm, preferably 0.5 mm. The thickness of the thickness compensation layer 3 should be 1-5 times the thickness of the tape 2, preferably 1.0 times.
[0052] 4. The surface of the thickness compensation layer 3 should form uniformly distributed protrusions as a gas guiding structure. When the cell 1 is packaged, it is beneficial for the gas to be discharged between the thickness compensation layer 3 and the aluminum-plastic film. The depth of these surface gas guiding structures is 10 to 100 μm, preferably 50 μm.
[0053] 5. The thickness compensation layer 3 of the 3D printing should strictly avoid the tape 2 and be 0-1mm away from the edge of the tape 2, preferably 0.5mm.
[0054] In a preferred embodiment, the edge of the thickness compensation layer 3 is provided with a chamfer, the angle of which is less than 45°; and / or, the width of the chamfer is 5 to 20 μm.
[0055] The edge of the thickness compensation layer 3 is designed with a chamfer, the chamfer angle is <45°, preferably 15°, and the chamfer width is 5 to 20 μm, preferably 10 μm. The chamfer can prevent the electrode of the cell 1 from being damaged by sharp corners.
[0056] In a preferred embodiment, the thickness compensation layer 3 is made of one or more of PET, PE, PP, polyimide, and silicone rubber.
[0057] Since the preferred material for tape 2 is PET, the material of thickness compensation layer 3 can be one or more of PET, PE, PP, polyimide, and silicone rubber, so that the modulus and deformation of thickness compensation layer 3 are the same as those of PET tape 2. Preferably, the material of thickness compensation layer 3 is PET.
[0058] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0059] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.
[0060] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.
[0061] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0062] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.
[0063] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. An all-solid-state battery, characterized in that, include: The battery cell has a first side and a second side that are arranged opposite to each other; A thickness compensation layer, wherein an avoidance groove is provided at the edge of the thickness compensation layer, the thickness compensation layer includes a first thickness compensation layer respectively disposed on the first surface and a second thickness compensation layer disposed on the second surface, and the avoidance groove includes a first avoidance groove disposed on the first thickness compensation layer and a second avoidance groove disposed on the second thickness compensation layer; The tape has one end attached to the first clearance groove along its length, and the other end attached to the second clearance groove opposite to the first clearance groove.
2. The all-solid-state battery according to claim 1, characterized in that, The depth of the clearance groove is equal to the difference between the thickness of the tape and the thickness of the adhesive layer of the tape.
3. The all-solid-state battery according to claim 1, characterized in that, The dimension of the thickness compensation layer in the first direction is equal to the dimension of the first surface in the first direction, and the dimension of the thickness compensation layer in the second direction is equal to the dimension of the first surface in the second direction.
4. The all-solid-state battery according to claim 3, characterized in that, The distance between the end of the tape along its length and the inner edge of the clearance groove is 0 to 1 mm; and / or, the distance between the edge of the tape along its width and the edge of the clearance groove is 0 to 1 mm.
5. The all-solid-state battery according to claim 1, characterized in that, The all-solid-state battery also includes an aluminum-plastic film, which is encapsulated in the thickness compensation layer and the outer periphery of the cell.
6. The all-solid-state battery according to claim 5, characterized in that, The thickness compensation layer is separate from the battery cell, and the thickness compensation layer has uniformly distributed protrusions on its surface near the battery cell.
7. The all-solid-state battery according to claim 6, characterized in that, The thickness compensation layer has uniformly distributed protrusions on its surface away from the battery cell.
8. The all-solid-state battery according to claim 6, characterized in that, The first thickness compensation layer and the second thickness compensation layer are integrally formed with the first surface and the second surface, respectively, and the surfaces of the first thickness compensation layer and the second thickness compensation layer are provided with uniformly distributed protrusions.
9. The all-solid-state battery according to claim 1, characterized in that, The thickness compensation layer has a chamfered edge with an angle less than 45°; and / or the chamfer has a width of 5 to 20 μm.
10. The all-solid-state battery according to claim 1, characterized in that, The thickness compensation layer is made of one or more of PET, PE, PP, polyimide, and silicone rubber.