Integrated battery pressing mold matched with all-solid-state battery material characterization

Abstract

The utility model relates to an integrated battery pressing mould matched with all-solid-state battery material characterization, which is characterized in that an upper pressing module, a pressing head guide sleeve and a lower pressing module are sequentially arranged in a pressing block guide sleeve from top to bottom, a battery sleeve is arranged in the pressing head guide sleeve, a battery assembly is arranged in the battery sleeve, an upper pressing head is arranged at the lower end of the upper pressing module, and a lower pressing head is arranged at the lower end of the lower pressing module. A lower pressing head is arranged at the upper end of the lower pressing module, the upper pressing head abuts against the upper side of the battery assembly after being inserted from the upper end of the battery sleeve, and the lower pressing head abuts against the lower side of the battery assembly after being inserted from the lower end of the battery sleeve; after pressing is completed, the battery assembly and the battery sleeve are taken out of the pressing head guide sleeve together. After pressing is completed, the battery sleeve and the battery assembly in the battery sleeve can be taken out together, demolding is convenient, meanwhile, the shape of the battery assembly cannot be damaged, and the battery sleeve and the battery assembly after demolding can be directly assembled on an in-situ X-ray imaging battery or other in-situ solid-state battery mold for testing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery test technical field, concretely is a kind of integrated battery pressing mould matched with all-solid-state battery material characterization. BACKGROUND

[0002] Compared with traditional batteries, all-solid-state batteries composed of inorganic solid-state electrolytes have higher safety performance. Compared with traditional liquid electrolytes, inorganic solid-state electrolytes have advantages such as non-flammability and non-leakage. In addition, inorganic solid-state electrolytes have a wide electrochemical stability window and high Young's modulus, which can match high-theoretical-capacity metal lithium anodes, high-voltage cathodes, and inhibit the generation of lithium dendrites in electrochemical processes. This not only takes advantage of the high energy density of metal lithium anodes and high-voltage cathode materials, but also further improves the safety performance of all-solid-state batteries.

[0003] However, a large number of experimental studies have shown that assembled all-solid-state batteries have low specific capacity, poor rate performance, and short cycle life, which is usually due to the unique "solid-solid" contact between the solid-state electrolyte and the electrode material in the all-solid-state battery. Unlike the liquid-solid contact between the liquid electrolyte and the electrode material in the traditional liquid battery, the solid-solid contact between the solid-state electrolyte and the electrode material is a rigid contact. Poor contact will result in the active electrode material not being able to fully exert its electrochemical performance, reducing the battery capacity. At the same time, poor solid-solid contact will also increase the interfacial impedance and hinder the effective migration of lithium ions, reducing the rate performance of the battery. On the other hand, the applied stacking external pressure during the operation of the solid-state battery can also cause the pulverization and structural degradation of the electrode material, which will also deteriorate the overall performance of the battery. Therefore, revealing the performance degradation mechanism of all-solid-state batteries and elucidating the failure mechanism of solid-state battery materials have become the key direction of all-solid-state battery research.

[0004] But the solid-state battery mold in the prior art is often difficult to analyze the performance degradation mechanism of the battery and the failure principle of the battery material. At present, the widely studied solid-state battery usually adopts a specific solid-state battery pressing mold and uses a powder pressing method for preparation, and then uses the solid-state battery pressing mold as a solid-state battery mold to connect an electrochemical workstation for electrochemical testing of the assembled battery. Please refer to patents CN219737364U, CN218272631U, CN218887272U, etc. Although the full solid-state battery can be assembled after several operations using such a solid-state battery mold or pressing mold, the failed electrode material is difficult to remove from such a battery mold or pressing mold and perform other characterization experiments such as optical microscopy, scanning electron microscopy, X-ray diffraction, and X-ray tomography. This is mainly because the electrode material formed by the powder pressing method is prone to friction with the inner wall of the mold cylinder when removed, resulting in some material remaining on the inner wall surface of the mold cylinder, thereby damaging the structural integrity of the outer surface of the formed compact electrode material. In addition, when characterizing the performance degradation mechanism of the full solid-state battery composed of a thinner electrolyte sheet, it is more difficult to directly remove the sheet from the ordinary tablet pressing mold after completing the tablet pressing process. Therefore, it limits the in-depth explanation of the failure mechanism of the solid-state battery.

[0005] In order to achieve the purpose of easy demolding of the solid-state battery without damaging the sample, some new pressing molds have appeared in the prior art, such as the patent CN217021539U discloses a left and right split full solid-state battery pressing mold. When pressing the solid-state battery, the left half mold and the right half mold are first connected and fixed together by the pull bolt and the through pin, and after the pressing is completed and the pull bolt and the through pin are removed, the pressing mold can be split into the left half mold and the right half mold, thereby achieving non-destructive demolding of the formed compact solid-state battery. For example, the patent CN218350460U discloses a solid-state battery pressing mold based on the combination of the pressure head guide sleeve and the pressure block guide sleeve formed by a plurality of lobe bodies. When pressing the solid-state battery, the plurality of lobe bodies are first assembled in the pressure block guide sleeve to form the pressure head guide sleeve, and after the pressing is completed, the lobe bodies of the pressure head guide sleeve are removed to achieve demolding of the formed compact battery. The above devices achieve the purpose of non-destructive removal of the pressed and formed solid-state battery from the mold, but their structures are relatively complex and cumbersome, and the demolded solid-state battery is difficult to transplant into other in-situ solid-state battery molds for in-situ characterization experiments such as optical microscopy and X-ray tomography. Practical new type

[0006] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0007] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0008] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0009] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0010] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0011] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0012] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0013] The utility model discloses a purpose lies in providing a kind of integrated battery pressing mould with full solid-state battery material characterization, the device can be extracted after completing pressing, and battery sleeve is taken out together with internal battery assembly, and it is convenient to demould, and also will not damage battery assembly form, and battery sleeve and battery assembly after demoulding can be directly assembled on in situ X-ray imaging battery or other in situ solid-state battery mould and test.

[0014] 1. The utility model discloses a press after first with upper and lower press module disassembles, then with the battery sleeve and battery assembly of inside guiding sleeve of press head is taken out from the guiding sleeve of press block, finally, the battery sleeve is together with the battery assembly of inside and is ejected from the guiding sleeve of press head with the demoulding stick, and the demoulding operation is more convenient, and because the demoulding stick and battery sleeve are in contact, therefore will not destroy the form of battery assembly.

[0015] 2. The utility model discloses the battery sleeve is taken out together with the battery assembly of inside, and the both ends of battery sleeve can be directly fitted on the corresponding end post in the X-ray imaging battery of original position, also can be fitted on the corresponding end post of other original position solid state battery mould according to the test need to carry out the in-situ characterization in the battery operating condition process, thereby can guarantee the failure mechanism analysis detection of battery, also improve the use flexibility of battery assembly. ACCURACY

[0016] Figure 1 It is the use state sectional view of the utility model,

[0017] Figure 2 It is Figure 1 The utility model discloses the exploded schematic view,

[0018] Figure 3 It is Figure 1 The structure schematic diagram of battery assembly,

[0019] Figure 4 It is the assembly process schematic Figure 1 of the utility model,

[0020] Figure 5 It is the assembly process schematic Figure 2 of the utility model,

[0021] Figure 6 It is the assembly process schematic Figure 3 of the utility model,

[0022] Figure 7 It is the assembly process schematic Figure 4 of the utility model,

[0023] Figure 8 It is the assembly process schematic Figure 5 of the utility model,

[0024] Figure 9 It is the X-ray imaging battery schematic diagram of in-situ of battery assembly formed by using the utility model,

[0025] Figure 10 It is Figure 9 The X-ray imaging test result schematic diagram of X-ray imaging battery of in-situ of assembly,

[0026] Figure 11 For Figure 9 The in-situ X-ray imaging battery electrochemical test result schematic diagram assembled in the middle.

[0027] Wherein, 1 is the upper pressing module, 101 is the upper limit flange, 102 is the upper pressing head, 2 is the lower pressing module, 201 is the lower limit flange, 202 is the lower pressing head, 3 is the pressing block guide sleeve, 4 is the pressing head guide sleeve, 5 is the battery sleeve, 6 is the battery assembly, 601 is the positive electrode gasket, 602 is the battery material layer, 6021 is the positive electrode material layer, 6022 is the solid electrolyte powder layer, 6023 is the negative electrode material layer, 603 is the negative electrode gasket, and 7 is the demolding rod. DETAILED DESCRIPTION

[0028] The utility model will be further described in detail below with reference to the drawings.

[0029] As Figures 1-8 shown, the utility model includes pressing block guide sleeve 3, and upper pressing module 1, pressing head guide sleeve 4 and lower pressing module 2 are sequentially equipped in pressing block guide sleeve 3 from top to bottom, wherein battery sleeve 5 is equipped in the inside of pressing head guide sleeve 4, battery assembly 6 is equipped in the inside of battery sleeve 5, upper pressing head 102 is equipped in the lower end of upper pressing module 1, lower pressing head 202 is equipped in the upper end of lower pressing module 2, and upper pressing head 102 is inserted into battery sleeve 5 upper end after and is in abutment with battery assembly 6 upper side, lower pressing head 202 is inserted into battery sleeve 5 lower end after and is in abutment with battery assembly 6 lower side, as Figure 9 shown, the utility model completes pressing, and battery assembly 6 together with battery sleeve 5 can be taken out and installed on in-situ X-ray imaging battery, so that, as Figures 10-11 shown, the assembled in-situ X-ray imaging battery can directly carry out relevant test.

[0030] As Figures 1-8 shown, in the embodiment, upper end of upper pressing module 1 is equipped with upper limit flange 101, and upper limit flange 101 is equipped on the upper side of pressing block guide sleeve 3, and lower end of lower pressing module 2 is equipped with lower limit flange 201, and lower limit flange 201 is equipped on the lower side of pressing block guide sleeve 3.

[0031] As Figure 1 , Figure 3 and Figure 10 shown, in the embodiment, battery assembly 6 includes positive electrode gasket 601, battery material layer 602 and negative electrode gasket 603 sequentially arranged from top to bottom, upper pressing head 102 is in abutment with positive electrode gasket 601, and lower pressing head 202 is in abutment with negative electrode gasket 603.

[0032] As Figure 3 andFigure 10 In the embodiment shown, the battery material layer 602 includes, from top to bottom, a positive electrode material layer 6021, a solid-state electrolyte powder layer 6022, and a negative electrode material layer 6023.

[0033] As shown in Figures 8-9 After the pressing is completed, the upper pressing module 1 and the lower pressing module 2 are first removed from the pressing block guide sleeve 3, and then the pressing head guide sleeve 4 is removed from the pressing block guide sleeve 3. Then, the battery assembly 6 together with the battery sleeve 5 is ejected from the pressing head guide sleeve 4 by a demolding rod 7. After ejection, the two ends of the battery sleeve 5 can be directly sleeved on the corresponding end posts inside the in-situ X-ray imaging battery, or can be sleeved on the corresponding end posts of other in-situ solid-state battery molds according to testing needs. In addition, since the demolding rod 7 abuts against the battery sleeve 5 to eject the battery assembly 6 together with the battery assembly 6 inside, the form of the battery assembly 6 will not be damaged.

[0034] The working principle of the utility model is as follows:

[0035] The following application example is used to illustrate the use process of the utility model. In the application example, a full-solid-state lithium-sulfur battery is pressed and assembled into an in-situ X-ray imaging battery for testing. The positive electrode material of the lithium-sulfur battery is Li2S composite positive electrode material powder, which includes the following components and the mass ratio of each component is Li2S:LSPS:C = 3.5:4:2.5 in wt%, the solid-state electrolyte is Li 10 SnP2S 12 (LSPS) solid-sulfide solid-state electrolyte powder, and the negative electrode material is InLi alloy.

[0036] Step 1: as shown in Figure 4 The inner diameter of the polyimide tube is 3.00 mm, the tube wall thickness is 0.01 mm, and the battery sleeve 5 is sleeved on the lower pressing head 202 (outer diameter is 3.00 mm) of the lower pressing module 2 made of stainless steel, and the bottom end of the battery sleeve 5 abuts against the upper surface of the lower pressing module 2.

[0037] Step 2: as shown in Figure 5 The negative electrode gasket 603 made of stainless steel with an outer diameter of 3.00 mm and a thickness of 0.30 mm is first placed inside the battery sleeve 5, and the negative electrode gasket 603 abuts against the upper end surface of the lower pressing head 202. Then, an InLi alloy with an outer diameter of 3.00 mm and a thickness of 0.50 mm is placed inside the battery sleeve 5 to form a negative electrode material layer 6023, and then 5.60 mg of Li 10 SnP2S 12(LSPS) sulfurized solid electrolyte powder to form a solid electrolyte powder layer 6022, then 0.40 mg of Li2S composite cathode material is placed to form a cathode material layer 6021, and finally a stainless steel positive electrode gasket 601 with an outer diameter of 3.00 mm and a thickness of 0.30 mm is placed.

[0038] Step 3: as shown in Figure 6 , a steel punch guide sleeve 4 with an inner diameter of 3.01 mm, an outer diameter of 25.00 mm, and a height of 15.00 mm is sleeved outside the battery sleeve 5 of the battery assembly 6 assembled in step 2, and at this time the punch guide sleeve 4 abuts against the upper surface of the lower pressing module 2.

[0039] Step 4: as shown in Figure 7 , an acrylic block guide sleeve 3 with an inner diameter of 40.00 mm, an outer diameter of 60.00 mm, and a height of 90.00 mm is sleeved outside the main body (with an outer diameter of 40.00 mm and a height of 40.00 mm) of the lower pressing module 2, and at the same time the lower end of the block guide sleeve 3 abuts against the lower limiting flange 201 of the lower pressing module 2.

[0040] Step 5: as shown in Figure 8 , the upper pressing module 1 of stainless steel is placed into the upper end of the block guide sleeve 3, and it is ensured that the upper press head 102 on the lower side of the upper pressing module 1 falls into the battery sleeve 5, and the lower end of the upper press head 102 abuts against the positive electrode gasket 601 in the battery assembly 6.

[0041] Step 6: the Figure 8 inventive new battery assembly 6 is placed on a stamping machine for battery pressing, and the pressure used is 360 MPa, and the stamping machine is a commonly known technology in the field.

[0042] Step 7: as shown in Figure 9 , after the battery pressing is completed, the inventive new battery is taken off the stamping machine, and then the upper pressing module 1, the lower pressing module 2, and the block guide sleeve 3 are removed, and then the punch guide sleeve 4 is taken out, and then a demolding rod 7 of stainless steel with an outer diameter of 3.00 mm and a length of 100.00 mm is used to eject the pressed battery assembly 6 together with the battery sleeve 5 from the punch guide sleeve 4.

[0043] Step 8: as shown in Figure 9 , the battery assembly 6 taken out in step 7 is used together with the battery sleeve 5 to assemble an in-situ X-ray imaging battery, and the structure of the assembled in-situ X-ray imaging battery is as shown in Figure 9 , and then various tests are performed on the assembled in-situ X-ray imaging battery, wherein Figure 10 the X-ray characterization results of the in-situ X-ray imaging battery are shown in Figure 11Electrochemical results are shown for in situ X-ray imaging batteries, with the vertical coordinate being potential and the horizontal coordinate being time.

Claims

1. An integrated battery pressing mold for characterizing all-solid-state battery materials, characterized in that: The application relates to a battery pressing device, which comprises a pressing block guide sleeve (3), and an upper pressing module (1), a pressing head guide sleeve (4) and a lower pressing module (2) are sequentially arranged in the pressing block guide sleeve (3) from top to bottom, a battery sleeve (5) is arranged in the pressing head guide sleeve (4), a battery assembly (6) is arranged in the battery sleeve (5), an upper pressing head (102) is arranged at the lower end of the upper pressing module (1), a lower pressing head (202) is arranged at the upper end of the lower pressing module (2), the upper pressing head (102) is inserted into the upper end of the battery sleeve (5) and abuts against the upper side of the battery assembly (6), the lower pressing head (202) is inserted into the lower end of the battery sleeve (5) and abuts against the lower side of the battery assembly (6), and the battery assembly (6) is taken out from the pressing head guide sleeve (4) together with the battery sleeve (5) after pressing.

2. The integrated battery press mold for characterization of a coin all-solid-state battery material of claim 1, wherein: An upper limiting flange (101) is arranged at the upper end of the upper pressing module (1) and located on the upper side of the pressing block guide sleeve (3), and a lower limiting flange (201) is arranged at the lower end of the lower pressing module (2) and located on the lower side of the pressing block guide sleeve (3).

3. The integrated battery press mold for characterization of a coin all-solid-state battery material of claim 1, wherein: The battery assembly (6) comprises a positive electrode gasket (601), a battery material layer (602) and a negative electrode gasket (603) which are sequentially arranged from top to bottom, the upper pressing head (102) abuts against the positive electrode gasket (601), and the lower pressing head (202) abuts against the negative electrode gasket (603).

4. The integrated battery press mold for characterization of a coin all-solid-state battery material of claim 3, wherein: The battery material layer (602) comprises a positive electrode material layer (6021), a solid-state electrolyte powder layer (6022) and a negative electrode material layer (6023) which are sequentially arranged from top to bottom.

5. The integrated battery press mold for characterization of a coin all-solid-state battery material of claim 1, wherein: After pressing, the upper pressing module (1) and the lower pressing module (2) are removed from the pressing block guide sleeve (3), then the pressing head guide sleeve (4) is taken out from the pressing block guide sleeve (3), then the battery assembly (6) is pushed out from the pressing head guide sleeve (4) together with the battery sleeve (5) through a demolding rod (7), and the demolding rod (7) abuts against the battery sleeve (5).

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