A lithium battery aluminum shell coating to prevent bulging and its manufacturing process

Abstract

This invention discloses an anti-bulging lithium battery aluminum shell coating and its manufacturing process, belonging to the field of lithium battery aluminum shell coating technology. It includes a clamping outer layer, an aluminum foil middle layer, and a protective inner layer. The clamping outer layer is disposed on the outer surface of the aluminum foil middle layer, and the protective inner layer is disposed on the inner surface of the aluminum foil middle layer. The thickness ratio of the clamping outer layer, the aluminum foil middle layer, and the protective inner layer is 2:2:1. This invention solves the problem that existing lithium battery aluminum shell coatings cannot effectively prevent lithium battery bulging during use, resulting in poor performance. By placing transverse and longitudinal clamping fixing strips within the base layer, this invention improves the overall support strength of the clamping outer layer. When the lithium battery aluminum shell coating is wrapped around the battery cell, the clamping outer layer adheres tightly to the cell and is not easily deformed, effectively clamping and reinforcing the cell. Its high strength prevents lithium battery bulging and improves the overall performance of the lithium battery aluminum shell coating.

Description

Technical Field

[0001] This invention relates to the field of lithium battery aluminum shell coating technology, specifically to a lithium battery aluminum shell coating for preventing bulging and its manufacturing process. Background Technology

[0002] As the power source for new energy vehicles, lithium battery technology has developed rapidly in recent years. Currently, the common lithium-ion battery structure involves the manufacturing process of square lithium batteries. After the cells are manufactured, they need to be assembled into a rigid square aluminum casing. Because the aluminum casing is hard, there is a risk of scratching the cells. Therefore, before installing the cells into the aluminum casing, a coating needs to be applied to prevent damage from the aluminum casing.

[0003] Chinese patent CN219801062U discloses a Mylar membrane structure and battery, belonging to the field of battery manufacturing technology. The disclosed Mylar membrane structure, by creating notches in the membrane, allows the adhesive structure to be simultaneously adhered to both the membrane and the outer surface of the battery cell, facilitating the connection between the membrane and the cell. Furthermore, it eliminates the need for a hot-melt process to connect the membrane and the cell, avoiding welding defects and ensuring battery production quality. The adhesion method is also simple, improving production efficiency. However, this patent has the following drawbacks:

[0004] Existing aluminum casing coatings for lithium batteries cannot effectively prevent lithium batteries from bulging during use, resulting in poor performance of the aluminum casing coatings for lithium batteries. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium battery aluminum shell coating that prevents bulging and its manufacturing process, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A lithium battery aluminum shell coating for preventing bulging includes a clamping outer layer, an aluminum foil middle layer, and a protective inner layer. The clamping outer layer is disposed on the outer surface of the aluminum foil middle layer, and the protective inner layer is disposed on the inner surface of the aluminum foil middle layer. The thickness ratio of the clamping outer layer, the aluminum foil middle layer, and the protective inner layer is 2:2:1.

[0008] Preferably, the clamping outer layer includes a base layer and a surface layer, wherein the surface layer is disposed on the base layer and the surface layer is attached to the base layer by an adhesive.

[0009] Preferably, the clamping outer layer further includes a transverse clamping fixing strip and a longitudinal clamping fixing strip. The transverse clamping fixing strip is arranged transversely within the base layer, and the longitudinal clamping fixing strip is arranged longitudinally within the base layer. The transverse clamping fixing strip and the longitudinal clamping fixing strip are connected to each other.

[0010] Preferably, both the base layer and the surface layer are made of polyamide fiber, which is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is then repeatedly extruded and stretched by a calender to form an extended product of uniform thickness. The extended product is then processed to form a base layer and a surface layer that meet the size requirements.

[0011] Preferably, both the transverse clamping and fixing strips and the longitudinal clamping and fixing strips are made of ultra-high molecular weight polyethylene (UHMWPE). High pressure is applied to UHMWPE below its melting point. Through a rotating wheel with a screw groove and an arc-shaped slider with a tongue groove perpendicular to the screw groove, the UHMWPE particles are deformed by the pressure generated by the friction between the material and the container wall during processing. Through particle deformation, the particles are fused together and the material is extruded through the die to form transverse clamping and fixing strips and longitudinal clamping and fixing strips that meet the size requirements.

[0012] Preferably, the base layer is provided with a positioning groove, and the transverse clamping and fixing strip and the longitudinal clamping and fixing strip are assembled in the positioning groove.

[0013] Preferably, the aluminum foil middle layer is made from aluminum blocks. Under the protection of an inert gas, the aluminum blocks are heated to a high temperature and melted. The molten aluminum is then cast into an aluminum plate. Through multiple rolling processes, a thin and long rolled product is formed. The rolled product is then processed to form an aluminum foil middle layer that meets the size requirements.

[0014] Preferably, the protective inner layer is made of polypropylene, which is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is then repeatedly squeezed and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form a protective inner layer that meets the size requirements.

[0015] According to another aspect of the present invention, a manufacturing process for an anti-bulging lithium battery aluminum shell coating as described above is provided, comprising the following steps:

[0016] S1, Production clamping outer layer:

[0017] Using polyamide fibers as raw materials, the pre-product is stirred, mixed, plasticized and compressed by an extruder, and then repeatedly extruded and stretched by a calender to form a base layer and surface layer that meet the size requirements.

[0018] The base layer is processed to create positioning grooves.

[0019] Using ultra-high molecular weight polyethylene as raw material, high pressure is applied to it below the melting point of ultra-high molecular weight polyethylene. The pressure causes the ultra-high molecular weight polyethylene particles to deform and fuse together. The material is then extruded through a die to form transverse clamping and fixing strips and longitudinal clamping and fixing strips that meet the size requirements.

[0020] The transverse clamping and fixing strips and the longitudinal clamping and fixing strips are assembled in the positioning groove, and the surface layer is bonded to the base layer to form the clamping outer layer.

[0021] S2, Production of the middle layer of aluminum foil:

[0022] Using aluminum blocks as raw material, the aluminum blocks are heated to a high temperature and smelted under the protection of inert gas. The molten aluminum is then cast into aluminum plates. Through multiple rolling processes, thin and long rolled products are formed. The rolled products are then processed to form an aluminum foil middle layer that meets the size requirements.

[0023] S3, Production Protective Inner Layer:

[0024] Using polypropylene as raw material, the pre-product of a certain shape is extruded by stirring, mixing, plasticizing and pressing in an extruder. The pre-product is then repeatedly extruded and stretched in a calender to form a uniformly thick extended product. The extended product is then processed to form a protective inner layer that meets the size requirements.

[0025] S4. Production of aluminum casing coating for lithium batteries:

[0026] A clamping outer layer is set on the outer surface of the aluminum foil middle layer, and a protective inner layer is set on the inner surface of the aluminum foil middle layer. Through multiple rolling processes, a lithium battery aluminum shell coating with uniform thickness is formed.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention improves the overall support strength of the clamping outer layer by setting the transverse and longitudinal clamping fixing strips inside the base layer. When the lithium battery aluminum shell coating is wrapped on the cell, the clamping outer layer can be tightly attached to the cell and is not easily deformed. It can clamp and reinforce the cell, and its high strength can prevent the lithium battery from bulging and improve the performance of the lithium battery aluminum shell coating. Attached Figure Description

[0029] Figure 1 This is a front view of the anti-bulging lithium battery aluminum shell coating of the present invention;

[0030] Figure 2 This is a schematic diagram showing the unfolded structure of the anti-bulging lithium battery aluminum shell coating of the present invention;

[0031] Figure 3 This is an exploded view of the clamping outer layer according to Embodiment 1 of the present invention;

[0032] Figure 4 An exploded view of a substrate layer provided with transverse clamping and fixing strips and longitudinal clamping and fixing strips according to Embodiment 1 of the present invention;

[0033] Figure 5 This is a schematic diagram of the transverse clamping and fixing strip and the longitudinal clamping and fixing strip according to Embodiment 1 of the present invention;

[0034] Figure 6 This is a schematic diagram of a transverse clamping and fixing strip provided on the base layer in Embodiment 2 of the present invention;

[0035] Figure 7 This is a schematic diagram of a longitudinal clamping and fixing strip provided on the base layer in Embodiment 3 of the present invention.

[0036] In the diagram: 1. Clamping outer layer; 11. Base layer; 111. Positioning groove; 12. Surface layer; 13. Transverse clamping fixing strip; 14. Longitudinal clamping fixing strip; 2. Aluminum foil middle layer; 3. Protective inner layer; Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To address the issue that existing lithium battery aluminum casing coatings are ineffective in preventing lithium battery bulging during use, resulting in poor performance, please refer to [link to relevant documentation]. Figures 1-7 This embodiment provides the following technical solution:

[0039] Example 1

[0040] A lithium battery aluminum shell coating for preventing bulging includes a clamping outer layer 1, an aluminum foil middle layer 2, and a protective inner layer 3. The clamping outer layer 1 is disposed on the outer surface of the aluminum foil middle layer 2, and the protective inner layer 3 is disposed on the inner surface of the aluminum foil middle layer 2. The thickness ratio of the clamping outer layer 1, the aluminum foil middle layer 2, and the protective inner layer 3 is 2:2:1.

[0041] It should be noted that when the aluminum shell coating of the lithium battery is wrapped around the cell, the outer clamping layer 1 can clamp and reinforce the cell, which has high strength, can prevent the lithium battery from bulging, and can improve the performance of the aluminum shell coating of the lithium battery.

[0042] In this embodiment, the clamping outer layer 1 includes a base layer 11 and a surface layer 12. The surface layer 12 is disposed on the base layer 11 and is attached to the base layer 11 by an adhesive.

[0043] In this embodiment, the clamping outer layer 1 further includes a transverse clamping fixing strip 13 and a longitudinal clamping fixing strip 14. The transverse clamping fixing strip 13 is arranged transversely within the base layer 11, and the longitudinal clamping fixing strip 14 is arranged longitudinally within the base layer 11. The transverse clamping fixing strip 13 and the longitudinal clamping fixing strip 14 are connected to each other.

[0044] It should be noted that by setting the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 inside the base layer 11, the overall support strength of the clamping outer layer 1 can be improved, the battery cell can be clamped and reinforced, the lithium battery can be prevented from bulging, and the effect of the lithium battery aluminum shell coating can be improved.

[0045] In this embodiment, both the base layer 11 and the surface layer 12 are made of polyamide fiber. The fiber is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly extruded and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the base layer 11 and the surface layer 12 that meet the size requirements.

[0046] It should be noted that polyamide fiber generally refers to nylon, which is a general term for thermoplastic resins containing repeating amide groups —[NHCO]— in the main molecular chain. It includes aliphatic PA, aliphatic-aromatic PA and aromatic PA. Among them, aliphatic PA has many varieties, large output and wide application. Its name is determined by the specific number of carbon atoms in the synthetic monomer. It has good wear resistance and high elastic recovery rate.

[0047] In this embodiment, both the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 are made of ultra-high molecular weight polyethylene (UHMWPE). High pressure is applied to UHMWPE below its melting point. Through a rotating wheel with a screw groove and an arc-shaped slider with a tongue groove (the tongue groove is perpendicular to the screw groove), the UHMWPE particles are deformed by the pressure generated by the friction between the material and the container wall during the processing. Through particle deformation, the particles are fused together and the material is extruded through the die to form the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 that meet the size requirements.

[0048] It should be noted that ultra-high molecular weight polyethylene (UHMWPE) is an unbranched linear polyethylene with a molecular weight of over 1.5 million. It has excellent comprehensive properties, including superior wear resistance, high strength, stable chemical properties, and strong anti-aging performance. Therefore, using UHMWPE to produce the transverse clamping and fixing strips 13 and longitudinal clamping and fixing strips 14 can improve the support strength of the transverse clamping and fixing strips 13 and longitudinal clamping and fixing strips 14, making the clamping outer layer 1 adhere tightly to the battery cell without easily deforming. This can clamp and reinforce the battery cell, prevent lithium battery bulging, and improve the performance of the aluminum shell coating of lithium batteries.

[0049] In this embodiment, a positioning groove 111 is provided on the base layer 11, and the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 are assembled in the positioning groove 111.

[0050] In this embodiment, the aluminum foil middle layer 2 is made from aluminum blocks. Under the protection of inert gas, the aluminum blocks are heated to a high temperature and melted. The molten aluminum is then cast into an aluminum plate. Through multiple rolling processes, a thin and long rolled product is formed. The rolled product is then processed to form the aluminum foil middle layer 2 that meets the size requirements.

[0051] In this embodiment, the protective inner layer 3 is made of polypropylene. The polypropylene is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly squeezed and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the protective inner layer 3 that meets the size requirements.

[0052] To better illustrate the production process of an anti-bulging lithium battery aluminum shell coating, this embodiment provides a production process for an anti-bulging lithium battery aluminum shell coating according to the above-mentioned method, including the following steps:

[0053] S1, Production clamping outer layer 1:

[0054] Using polyamide fiber as raw material, the pre-product is stirred, mixed, plasticized and compressed by an extruder, and then repeatedly extruded and stretched by a calender to form a base layer 11 and a surface layer 12 that meet the size requirements.

[0055] The base layer 11 is processed to create a positioning groove 111 on the base layer 11;

[0056] Using ultra-high molecular weight polyethylene as raw material, high pressure is applied to it below the melting point of ultra-high molecular weight polyethylene. The pressure causes the ultra-high molecular weight polyethylene particles to deform and fuse the particles together. The material is then extruded through the die to form transverse clamping and fixing strips 13 and longitudinal clamping and fixing strips 14 that meet the size requirements.

[0057] The transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 are assembled in the positioning groove 111, and the surface layer 12 is bonded to the base layer 11 to form the clamping outer layer 1.

[0058] S2, Production of aluminum foil middle layer 2:

[0059] Using aluminum blocks as raw materials, the aluminum blocks are heated to high temperature and smelted under inert gas protection. The molten aluminum is then cast into aluminum plates. Through multiple rolling processes, thin and long rolled products are formed. The rolled products are then processed to form aluminum foil middle layer 2 that meets the size requirements.

[0060] S3, Production Protective Inner Layer 3:

[0061] Using polypropylene as raw material, the pre-product of a certain shape is extruded by stirring, mixing, plasticizing and pressing in an extruder. The pre-product is then repeatedly extruded and stretched in a calender to form a uniformly thick extended product. The extended product is then processed to form a protective inner layer 3 that meets the size requirements.

[0062] S4. Production of aluminum casing coating for lithium batteries:

[0063] A clamping outer layer 1 is provided on the outer surface of the aluminum foil middle layer 2, and a protective inner layer 3 is provided on the inner surface of the aluminum foil middle layer 2. Through multiple rolling processes, a lithium battery aluminum shell coating with uniform thickness is formed.

[0064] Example 2

[0065] A lithium battery aluminum shell coating for preventing bulging includes a clamping outer layer 1, an aluminum foil middle layer 2, and a protective inner layer 3. The clamping outer layer 1 is disposed on the outer surface of the aluminum foil middle layer 2, and the protective inner layer 3 is disposed on the inner surface of the aluminum foil middle layer 2. The thickness ratio of the clamping outer layer 1, the aluminum foil middle layer 2, and the protective inner layer 3 is 2:2:1.

[0066] It should be noted that when the aluminum shell coating of the lithium battery is wrapped around the cell, the outer clamping layer 1 can clamp and reinforce the cell, which has high strength, can prevent the lithium battery from bulging, and can improve the performance of the aluminum shell coating of the lithium battery.

[0067] In this embodiment, the clamping outer layer 1 includes a base layer 11 and a surface layer 12. The surface layer 12 is disposed on the base layer 11 and is attached to the base layer 11 by an adhesive.

[0068] In this embodiment, the clamping outer layer 1 further includes a transverse clamping fixing strip 13, which is transversely disposed within the base layer 11.

[0069] In this embodiment, both the base layer 11 and the surface layer 12 are made of polyamide fiber. The fiber is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly extruded and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the base layer 11 and the surface layer 12 that meet the size requirements.

[0070] In this embodiment, the transverse clamping and fixing strip 13 is made of ultra-high molecular weight polyethylene (UHMWPE). High pressure is applied to UHMWPE below its melting point. Through a rotating wheel with a screw groove and an arc-shaped slider with a tongue groove (the tongue groove is perpendicular to the screw groove), the UHMWPE particles are deformed by the pressure generated by the friction between the material and the container wall during the processing. Through particle deformation, the particles are fused together and the material is extruded through the die to form the transverse clamping and fixing strip 13 that meets the size requirements.

[0071] In this embodiment, a positioning groove 111 is provided on the base layer 11, and the transverse clamping and fixing strip 13 is assembled in the positioning groove 111.

[0072] In this embodiment, the aluminum foil middle layer 2 is made from aluminum blocks. Under the protection of inert gas, the aluminum blocks are heated to a high temperature and melted. The molten aluminum is then cast into an aluminum plate. Through multiple rolling processes, a thin and long rolled product is formed. The rolled product is then processed to form the aluminum foil middle layer 2 that meets the size requirements.

[0073] In this embodiment, the protective inner layer 3 is made of polypropylene. The polypropylene is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly squeezed and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the protective inner layer 3 that meets the size requirements.

[0074] Compared with Example 1, Example 2 eliminates the longitudinal clamping and fixing strip 14 structure. The same production process as Example 1 is used to produce the lithium battery aluminum shell coating, and the production step of the longitudinal clamping and fixing strip 14 is eliminated accordingly.

[0075] Example 3

[0076] A lithium battery aluminum shell coating for preventing bulging includes a clamping outer layer 1, an aluminum foil middle layer 2, and a protective inner layer 3. The clamping outer layer 1 is disposed on the outer surface of the aluminum foil middle layer 2, and the protective inner layer 3 is disposed on the inner surface of the aluminum foil middle layer 2. The thickness ratio of the clamping outer layer 1, the aluminum foil middle layer 2, and the protective inner layer 3 is 2:2:1.

[0077] It should be noted that when the aluminum shell coating of the lithium battery is wrapped around the cell, the outer clamping layer 1 can clamp and reinforce the cell, which has high strength, can prevent the lithium battery from bulging, and can improve the performance of the aluminum shell coating of the lithium battery.

[0078] In this embodiment, the clamping outer layer 1 includes a base layer 11 and a surface layer 12. The surface layer 12 is disposed on the base layer 11 and is attached to the base layer 11 by an adhesive.

[0079] In this embodiment, the clamping outer layer 1 further includes a longitudinal clamping fixing strip 14, which is longitudinally disposed within the base layer 11.

[0080] In this embodiment, both the base layer 11 and the surface layer 12 are made of polyamide fiber. The fiber is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly extruded and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the base layer 11 and the surface layer 12 that meet the size requirements.

[0081] In this embodiment, the longitudinal clamping and fixing strips 14 are all made of ultra-high molecular weight polyethylene (UHMWPE). High pressure is applied to UHMWPE below its melting point. Through a rotating wheel with a screw groove and an arc-shaped slider with a tongue groove, the tongue groove is perpendicular to the screw groove. During the processing, the pressure generated by the friction between the material and the container wall causes the UHMWPE particles to deform. Through particle deformation, the particles are fused together and the material is extruded through the die to form the longitudinal clamping and fixing strips 14 that meet the size requirements.

[0082] In this embodiment, a positioning groove 111 is provided on the base layer 11, and the longitudinal clamping and fixing strip 14 is assembled in the positioning groove 111.

[0083] In this embodiment, the aluminum foil middle layer 2 is made from aluminum blocks. Under the protection of inert gas, the aluminum blocks are heated to a high temperature and melted. The molten aluminum is then cast into an aluminum plate. Through multiple rolling processes, a thin and long rolled product is formed. The rolled product is then processed to form the aluminum foil middle layer 2 that meets the size requirements.

[0084] In this embodiment, the protective inner layer 3 is made of polypropylene. The polypropylene is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly squeezed and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the protective inner layer 3 that meets the size requirements.

[0085] Compared with Example 1, Example 3 eliminates the transverse clamping and fixing strip 13 structure. The same production process as Example 1 is used to produce the lithium battery aluminum shell coating, and the production step of the transverse clamping and fixing strip 13 is eliminated accordingly.

[0086] Comparative Example

[0087] A lithium battery aluminum shell coating for preventing bulging includes a clamping outer layer 1, an aluminum foil middle layer 2, and a protective inner layer 3. The clamping outer layer 1 is disposed on the outer surface of the aluminum foil middle layer 2, and the protective inner layer 3 is disposed on the inner surface of the aluminum foil middle layer 2. The thickness ratio of the clamping outer layer 1, the aluminum foil middle layer 2, and the protective inner layer 3 is 2:2:1.

[0088] It should be noted that when the aluminum shell coating of the lithium battery is wrapped around the cell, the outer clamping layer 1 can clamp and reinforce the cell, which has high strength, can prevent the lithium battery from bulging, and can improve the performance of the aluminum shell coating of the lithium battery.

[0089] In this embodiment, the clamping outer layer 1 includes a base layer 11 and a surface layer 12. The surface layer 12 is disposed on the base layer 11 and is attached to the base layer 11 by an adhesive.

[0090] In this embodiment, both the base layer 11 and the surface layer 12 are made of polyamide fiber. The fiber is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly extruded and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the base layer 11 and the surface layer 12 that meet the size requirements.

[0091] In this embodiment, the aluminum foil middle layer 2 is made from aluminum blocks. Under the protection of inert gas, the aluminum blocks are heated to a high temperature and melted. The molten aluminum is then cast into an aluminum plate. Through multiple rolling processes, a thin and long rolled product is formed. The rolled product is then processed to form the aluminum foil middle layer 2 that meets the size requirements.

[0092] In this embodiment, the protective inner layer 3 is made of polypropylene. The polypropylene is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly squeezed and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form the protective inner layer 3 that meets the size requirements.

[0093] Compared with Example 1, the comparative example omits the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14. The same production process as Example 1 is used to produce the lithium battery aluminum shell coating, and the production steps of the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 are correspondingly eliminated.

[0094] The performance of the lithium battery aluminum shell coatings produced in Examples 1 to 3 and the comparative example was tested, and the performance test results of the lithium battery aluminum shell coatings are shown in Table 1:

[0095] Table 1: Performance Test Results of Aluminum Shell Coating for Lithium-ion Batteries

[0096]

[0097] As can be seen from the table above, the lithium battery aluminum shell coatings produced in Examples 1 to 3 all have good support strength and anti-bulging rate.

[0098] Compared with Example 1, Example 2 shows a decrease in both support strength and anti-bulging rate, indicating that the longitudinal clamping and fixing strip 14 can improve the support strength and anti-bulging rate of the lithium battery aluminum shell coating.

[0099] Compared with Example 1, Example 3 shows a decrease in both support strength and anti-bulging rate, indicating that the transverse clamping fixing strip 13 can improve the support strength and anti-bulging rate of the lithium battery aluminum shell coating.

[0100] Compared with Example 1, the comparative example showed a decrease in both support strength and anti-bulging rate. Since the comparative example did not add the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14, the support strength and anti-bulging rate of the lithium battery aluminum shell coating decreased. This indicates that the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 can improve the support strength and anti-bulging rate of the lithium battery aluminum shell coating.

[0101] Therefore, by setting the transverse clamping and fixing strip 13 and the longitudinal clamping and fixing strip 14 inside the base layer 11, the overall support strength of the clamping outer layer 1 can be improved. When the lithium battery aluminum shell coating is wrapped on the cell, the clamping outer layer 1 can be tightly attached to the cell and is not easily deformed. The cell can be clamped and reinforced. It has high strength, which can prevent the lithium battery from bulging and improve the performance of the lithium battery aluminum shell coating.

[0102] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0103] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for producing an anti-bulging lithium battery aluminum shell coating, used to produce an anti-bulging lithium battery aluminum shell coating, the anti-bulging lithium battery aluminum shell coating comprising a clamping outer layer (1), an aluminum foil middle layer (2), and a protective inner layer (3), characterized in that, The outer surface of the aluminum foil middle layer (2) is provided with a clamping outer layer (1), and the inner surface of the aluminum foil middle layer (2) is provided with a protective inner layer (3). The thickness ratio of the clamping outer layer (1), the aluminum foil middle layer (2) and the protective inner layer (3) is 2:2:

1. The clamping outer layer (1) includes a base layer (11) and a surface layer (12). The surface layer (12) is disposed on the base layer (11) and is connected to the base layer (11) by an adhesive. The clamping outer layer (1) also includes a transverse clamping fixing strip (13) and a longitudinal clamping fixing strip (14). The transverse clamping fixing strip (13) is disposed transversely in the base layer (11), and the longitudinal clamping fixing strip (14) is disposed longitudinally in the base layer (11). The transverse clamping fixing strip (13) and the longitudinal clamping fixing strip (14) are connected to each other. The base layer (11) is provided with a positioning groove (111), and the transverse clamping fixing strip (13) and the longitudinal clamping fixing strip (14) are assembled in the positioning groove (111). The production method of the anti-bulging lithium battery aluminum shell coating includes the following steps: S1, Production clamping outer layer (1): Using polyamide fiber as raw material, the product is stirred, mixed, plasticized and compressed by an extruder, and the pre-product is repeatedly extruded and stretched by a calender to form a base layer (11) and a surface layer (12) that meet the size requirements. The base layer (11) is processed to form a positioning groove (111). Using ultra-high molecular weight polyethylene as raw material, high pressure is applied to it below the melting point of ultra-high molecular weight polyethylene. The pressure causes the ultra-high molecular weight polyethylene particles to deform and fuse the particles together. The material is extruded through the die to form a transverse clamping and fixing strip (13) and a longitudinal clamping and fixing strip (14) that meet the size requirements. The transverse clamping and fixing strip (13) and the longitudinal clamping and fixing strip (14) are assembled in the positioning groove (111), and the surface layer (12) is bonded to the base layer (11) to form a clamping outer layer (1). S2, Production of the middle layer of aluminum foil (2): Using aluminum blocks as raw materials, the aluminum blocks are heated to high temperature and smelted under inert gas protection. The smelted aluminum liquid is cast into aluminum plates and rolled into thin and long rolled products through multiple rolling processes. The rolled products are then processed to form an aluminum foil middle layer that meets the size requirements (2). S3, Production protective inner layer (3): Using polypropylene as raw material, the pre-product of a certain shape is extruded by stirring, mixing, plasticizing and pressing in an extruder. The pre-product is repeatedly squeezed and stretched in a calender to form a uniformly thick extended product. The extended product is then processed to form a protective inner layer that meets the size requirements (3). S4. Production of aluminum casing coating for lithium batteries: A clamping outer layer (1) is provided on the outer surface of the aluminum foil middle layer (2), and a protective inner layer (3) is provided on the inner surface of the aluminum foil middle layer (2). Through multiple rolling passes, a lithium battery aluminum shell coating with uniform thickness is formed.

2. The method for producing an anti-bulging lithium battery aluminum shell coating according to claim 1, characterized in that, The base layer (11) and surface layer (12) are both made of polyamide fiber. The pre-products are stirred, mixed, plasticized and compressed by an extruder to form a certain shape. The pre-products are repeatedly squeezed and stretched by a calender to form a uniformly thick extended product. The extended product is then processed to form a base layer (11) and surface layer (12) that meet the size requirements.

3. The method for producing an anti-bulging lithium battery aluminum shell coating according to claim 2, characterized in that, Both the transverse clamping and fixing strip (13) and the longitudinal clamping and fixing strip (14) are made of ultra-high molecular weight polyethylene. High pressure is applied to the ultra-high molecular weight polyethylene below its melting point. Through a rotating wheel with a screw groove and an arc-shaped slider with a tongue groove, the tongue groove is perpendicular to the screw groove. During the processing, the pressure generated by the friction between the material and the container wall causes the ultra-high molecular weight polyethylene particles to deform. Through particle deformation, the particles are fused together and the material is extruded through the die to form the transverse clamping and fixing strip (13) and the longitudinal clamping and fixing strip (14) that meet the size requirements.

4. The method for producing an anti-bulging lithium battery aluminum shell coating according to claim 1, characterized in that, The aluminum foil middle layer (2) is made from aluminum blocks. Under the protection of inert gas, the aluminum blocks are heated to a high temperature and melted. The melted aluminum liquid is cast into an aluminum plate. Through multiple rolling processes, a thin and long rolled product is formed. The rolled product is processed to form an aluminum foil middle layer (2) that meets the size requirements.

5. The method for producing an anti-bulging lithium battery aluminum shell coating according to claim 1, characterized in that, The protective inner layer (3) is made of polypropylene as raw material. It is stirred, mixed, plasticized and compressed by an extruder to extrude a pre-product of a certain shape. The pre-product is repeatedly squeezed and stretched by a calender to form an extended product with uniform thickness. The extended product is then processed to form a protective inner layer (3) that meets the size requirements.

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