A manufacturing process for an internally insulated battery case

Abstract

The application discloses a manufacturing process of an inner insulation battery shell, and steps of the manufacturing process comprise the following steps: arranging a battery shell and an insulation lining, the battery shell being internally provided with a cavity; uniformly applying a first adhesive on a glue coating area of an inner wall of the cavity or an outer wall of the insulation lining, so as to form a bonding layer on the glue coating area of the inner wall of the cavity or the outer wall of the insulation lining; loading the battery shell and the insulation lining on a first assembly structure and a second assembly structure of an assembly device respectively, when the first assembly structure and the second assembly structure of the assembly device are closed, the insulation lining is located in the cavity, and the outer wall of the insulation lining is bonded and fixed on the inner wall of the cavity through the bonding layer; continuously applying an electrolyte-resistant second adhesive between an opening edge of the insulation lining and the inner wall of the cavity, the second adhesive connecting and sealing the opening edge of the insulation lining and the inner wall of the cavity, and the second adhesive being continuously arranged along the opening of the insulation lining. The manufacturing process makes the insulation lining and the battery shell closely fit and fixed more firmly.

Description

Technical Field

[0001] This invention belongs to the technical field of new energy vehicle batteries, specifically relating to a manufacturing process for an internally insulating battery casing. Background Technology

[0002] The battery is a core component of new energy vehicles and the power source for their operation. In traditional new energy vehicle batteries, the cells are wrapped with an insulating film with vents (lacking any sealing function), leaving the electrolyte in contact with the casing. Therefore, under high voltage, the electrolyte and casing become conductive, causing current to break down the plastic at the positive and negative electrodes, resulting in a short circuit and posing a risk of fire and explosion. To address this defect, the battery casing structure has been modified by bonding the non-venting insulating film to the inner wall of the battery casing. The upper edge of the insulating film is not sealed to prevent the electrolyte from conducting with the casing, thus reducing the probability of short circuits and the risk of cell fire and explosion. However, the upper edge of the insulating film is not sealed to the inner wall of the battery casing, which makes it easy for the adhesive layer to come into contact with the electrolyte inside the battery. This adhesive layer is not resistant to electrolyte, so once the adhesive layer comes into contact with the electrolyte, it is easy for the adhesive to fail, which makes the insulating film easy to fall off. The electrolyte can also easily enter between the insulating film and the battery casing, causing electrolyte loss and reducing the battery's range. Therefore, this problem urgently needs to be solved. Summary of the Invention

[0003] This invention provides a manufacturing process for an internally insulating battery casing to address the shortcomings of the aforementioned technical problems.

[0004] The manufacturing process of an internally insulating battery casing designed in this invention includes the following steps: S1. Configure a battery casing and an insulating liner. The battery casing has a cavity inside, and the shape of the insulating liner is adapted to the shape of the cavity. S2. Apply the first adhesive evenly to the adhesive application area on the inner wall of the cavity or the outer wall of the insulating liner to form an adhesive layer on the adhesive application area on the inner wall of the cavity or the outer wall of the insulating liner. S3. The battery casing and the insulating liner are respectively loaded onto the first assembly structure and the second assembly structure of the assembly equipment. When the first assembly structure and the second assembly structure of the assembly equipment are closed, the insulating liner is located in the cavity, and the outer wall of the insulating liner is bonded and fixed to the inner wall of the cavity through the adhesive layer. S4. A second adhesive resistant to electrolyte is continuously applied between the opening edge of the insulating liner and the inner wall of the cavity. The second adhesive connects the opening edge of the insulating liner to the inner wall of the cavity to seal the bonding section of the adhesive layer, and the second adhesive is continuously applied along the opening of the insulating liner.

[0005] According to the manufacturing process of an inner insulating battery shell described above, in step S4, the battery shell with the insulating inner liner is positioned on the positioning fixture. When the nozzle of the spray nozzle approaches the opening edge of the insulating inner liner, the spray nozzle moves along the trajectory of the opening edge of the insulating inner liner. During the movement, the nozzle of the spray nozzle sprays out a second adhesive and coats it onto the opening edge of the insulating inner liner.

[0006] According to the manufacturing process of an inner insulating battery casing described above, the positioning fixture is vertically arranged so that the battery casing with the insulating inner liner is vertically positioned on the positioning fixture, and the opening of the battery casing faces the glue spraying head. The glue spraying head is vertically arranged so that the glue nozzle axis of the glue spraying head is parallel to the axis of the positioning fixture. During the second adhesive application, the movement trajectory of the glue spraying head is a circular movement trajectory along the edge of the opening of the insulating inner liner; or... The positioning fixture is tilted so that the battery case with the insulating liner is positioned tilted on the positioning fixture, and the opening of the battery case faces the glue spraying head. The glue spraying head is tilted so that the glue nozzle axis of the glue spraying head is parallel to the axis of the positioning fixture. When the second adhesive is applied, the movement trajectory of the glue spraying head is a circular movement trajectory along the edge of the opening of the insulating liner.

[0007] According to the manufacturing process of an inner insulating battery shell described above, the positioning fixture is inclined so that the battery shell with the insulating inner liner is positioned in an inclined position on the positioning fixture, and the glue spraying head is vertically set. The angle between the glue nozzle axis of the glue spraying head and the axis of the positioning fixture is an obtuse angle. The opening edge of the insulating inner liner includes two opposing first edges and two opposing second edges. When the battery case with the insulating inner liner is positioned horizontally and tilted on the positioning fixture, the glue spray head moves in a straight line along the trajectory of the first edge to apply the second adhesive to the first edge. When the battery case with the insulating inner liner is positioned vertically and tilted on the positioning fixture, the glue spray head moves in a straight line along the trajectory of the second edge to apply the second adhesive to the second edge.

[0008] According to the manufacturing process of an inner insulating battery shell described above, a step of surface pretreatment of the outer wall of the insulating liner is provided between step S1 and step S2. The step includes surface pretreatment with a treatment agent, flame surface pretreatment, corona surface pretreatment or plasma surface treatment. Surface pretreatment of the treatment agent involves wiping the outer wall of the insulating liner with a wiping agent soaked in alcohol to clean it. After cleaning, a chlorinated polyolefin modified primer is applied to the outer wall of the insulating liner. The process is completed after the outer wall of the insulating liner dries. Flame surface pretreatment involves wiping the outer wall of the insulating liner with an alcohol-soaked wiping agent to clean it. The blue outer flame of the flame gun sweeps across the cleaned outer wall of the insulating liner at a uniform and rapid speed. The distance between the nozzle of the flame gun and the outer wall of the insulating liner is 10-15cm, and the dwell time during each sweep is ≤1 second. For corona surface pretreatment, the outer wall of the insulating liner is wiped with a wiping body soaked in alcohol to clean it. The cleaned insulating liner is then passed through the corona space of the corona machine at a uniform speed, with the outer wall of the cleaned insulating liner facing the corona roller of the corona machine during passage. The working power of the corona roller is 500-1000W, and the distance between the outer wall of the insulating liner and the corona roller of the corona machine is 2-3mm. Plasma surface treatment involves wiping the outer wall of the insulating liner with an alcohol-soaked wiping agent to clean it. Plasma sprayed from a plasma gun sweeps across the cleaned outer wall of the insulating liner at a uniform and rapid speed. The distance between the nozzle of the plasma gun and the outer wall of the insulating liner is 5-15mm, and the displacement speed of the plasma gun sweeping across the cleaned outer wall of the insulating liner is 50-100mm / s.

[0009] According to the manufacturing process of an inner insulating battery case described above, a step of performing surface pretreatment on at least a portion of the inner wall of the cavity of the battery case to form an adhesive coating area is provided between step S1 and step S2. The step includes surface pretreatment by grinding, surface pretreatment by etching, surface pretreatment by primer, or surface pretreatment by sandblasting. For surface pretreatment, at least part of the inner wall of the cavity of the battery case is wiped with a wiping cloth soaked in alcohol to clean it. At least part of the inner wall of the cavity of the battery case is sanded with sandpaper. After sanding, an adhesive area is formed. Then, the adhesive area is cleaned and wiped again with a wiping cloth soaked in alcohol. For surface corrosion pretreatment, use alkaline degreasing powder to remove oil stains from at least part of the inner wall of the battery case cavity. Rinse the inner wall of the battery case cavity with clean water multiple times to remove the alkaline degreasing powder. Then, immerse the battery case in a 5% dilute sulfuric acid solution or an environmentally friendly aluminum micro-etching agent at room temperature for 30-60 seconds until the inner wall of the battery case cavity uniformly loses its gloss, indicating that the treatment is complete. A coating area is formed on the inner wall of the battery case cavity. Then, rinse the entire battery case with the gloss-free inner wall with clean water multiple times again. After rinsing, dry the battery case. The primer surface pretreatment involves wiping at least part of the inner wall of the battery case cavity with an alcohol-soaked wiping agent to clean it. After the inner wall of the battery case cavity has been cleaned, a silane solution is applied and then dried. After drying, the adhesive coating area is formed. The surface is pretreated by sandblasting. Isopropyl alcohol is used to clean at least part of the inner wall of the cavity of the battery case. The inner wall of the cavity of the battery case is sandblasted to form a rough surface. The sand and dust on the rough surface are blown away with an air gun and then dried. After drying, the rough surface is used as the adhesive coating area.

[0010] According to the manufacturing process of an inner insulating battery casing described above, in step S2, the insulating liner is fitted onto the face-changing fixture, with the outer wall of the insulating liner that needs to be coated with the first adhesive facing the nozzle of the glue sprayer. When the nozzle of the glue sprayer approaches the outer wall of the insulating liner that needs to be coated with the first adhesive, the nozzle of the glue sprayer sprays out the first adhesive and coats it on the outer wall of one side of the insulating liner. At the same time, the glue sprayer is driven to move so that the outer wall of one side of the insulating liner is evenly coated with the first adhesive. After the outer wall of one side of the insulating liner is coated, the face-changing fixture moves to make the insulating liner face-changing multiple times. After each face-changing, the first adhesive coating is performed again until the outer wall of each side of the insulating liner is evenly coated with the first adhesive.

[0011] According to the manufacturing process of an inner insulating battery shell described above, in step S2, the nozzle of the glue sprayer enters the cavity and faces the glue application area of ​​the cavity. At this time, the displacement of the nozzle of the glue sprayer causes the first adhesive to be uniformly applied to the glue application area.

[0012] According to the manufacturing process of an inner insulating battery case described above, in step S3, the second assembly structure of the assembly equipment includes an outwardly expanding assembly body adapted to the shape of the insulating liner. The insulating liner is fitted onto the outwardly expanding assembly body, and the battery case is positioned on the first assembly structure of the assembly equipment. The outwardly expanding assembly body and the first assembly structure of the assembly equipment are coaxially arranged. When the outwardly expanding assembly body or the first assembly structure is translated along the axis, the outwardly expanding assembly body is inserted into the cavity of the battery case, so that the bottom outer wall of the insulating liner and the bottom inner wall of the cavity are tightly bonded together through an adhesive layer. The heating element in the outwardly expanding assembly body works to heat and soften the insulating liner. After heating is completed, the multiple movable parts of the outwardly expanding assembly body move outward and expand, causing the peripheral sidewall of the insulating liner to expand outward and be tightly bonded to the inner peripheral wall of the cavity through an adhesive layer.

[0013] According to the manufacturing process of an internally insulated battery casing described above, the first assembly structure of the assembly equipment includes a positioning sleeve, on which a positioning cavity is provided for adapting the shape of the battery casing, and the battery casing is placed in the positioning cavity for positioning.

[0014] The manufacturing process for an internally insulating battery casing designed in this invention has the following beneficial effects: The opening edge of the insulating liner is sealed to the inner wall of the cavity with a second adhesive to seal the opening edge of the insulating liner with the inner wall of the cavity, so that the insulating liner and the battery shell fit tightly and are more firmly fixed, and also avoid the problem of the insulating liner opening edge and the inner wall of the cavity easily coming apart. Attached Figure Description

[0015] Figure 1 This is an assembly process diagram showing the bonding layer forming on the outer wall of the insulating liner.

[0016] Figure 2 This is a magnified view of point A.

[0017] Figure 3 This is an assembly process diagram showing the bonding layer forming on the inner wall of the battery casing.

[0018] Figure 4 This is a magnified view of point B.

[0019] Figure 5 This is a cross-sectional view of the inner insulating battery casing in three dimensions.

[0020] Figure 6 This is a magnified view of point C.

[0021] Figure 7 This is a 3D view of the inner insulating battery casing.

[0022] Figure 8 This is a magnified view of point D.

[0023] Figure 9 This is a schematic diagram (a) of the insulating liner being coated with the first adhesive.

[0024] Figure 10 This is a schematic diagram (II) of the insulating lining being coated with the first adhesive.

[0025] Figure 11 This is a schematic diagram (III) of the insulating lining being coated with the first adhesive.

[0026] Figure 12 This is a schematic diagram of applying a second adhesive to the first edge.

[0027] Figure 13 This is a schematic diagram (a) of applying a second adhesive to the second edge.

[0028] Figure 14 This is a schematic diagram (II) of applying a second adhesive to the second edge.

[0029] Figure 15 It is a three-dimensional view of the overall structure of the assembly equipment (equipped with a shell and insulating liner).

[0030] Figure 16It is a three-dimensional view of the overall structure of the assembly equipment (without the housing and insulating liner assembled).

[0031] Figure 17 This is an exploded view of the area between the baffle and the mounting base.

[0032] Figure 18 This is a partial exploded view of the expanded assembly.

[0033] Figure 19 This is a structural diagram of the outward-expanding assembly when the inner top block is not extended.

[0034] Figure 20 This is a structural diagram of the outward-expanding assembly when the inner top block extends.

[0035] Figure 21 It is an exploded view of the overall expanded assembly.

[0036] Figure 22 It is a structural explosion of the first assembly structure. Figure 1 .

[0037] Figure 23 It is a structural explosion of the first assembly structure. Figure 2 .

[0038] Figure 24 This is a three-dimensional structural view of the unassembled battery casing and insulating liner.

[0039] Figure 25 This is a bottom view of the structure of the unassembled insulating liner.

[0040] Figure 26 This is a cross-sectional view of the insulating liner being fitted onto the inner support block.

[0041] Figure 27 This is a schematic diagram of the cooling pipes inside the positioning sleeve.

[0042] Labels: 20. Clearance; 21. Draft angle; 3. Base; 4. First assembly structure; 41. Fixed seat; 411. Groove; 412. Mounting hole; 413. Guide post; 414. Push plate; 415. Second reset elastic element; 416. Side groove; 417. Countersunk hole; 418. Screw hole; 42. Positioning sleeve; 421. Positioning cavity; 43. Slider; 44. Guide rail; 45. Translation drive element; 5. Second assembly structure; 51. Mounting seat; 52. Slide groove; 53. Inner support element; 531. Base; 532. Inner support block; 533. Blind hole; 54. Guide groove; 55. Inner top block; 56. First reset elastic element; 57. Telescopic drive element; 58. Heating assembly; 59. Cooling pipe; 591. Inlet; 592. Outlet; 593. Plug; 510. Baffle; 100 Battery casing; 110 Cavity; 200 Insulating liner; 210 Opening edge; 220 Adhesive sprayer; 221 Spray nozzle; 230 Face-changing fixture; 300 Adhesive layer; 400 Second adhesive; 410 Positioning fixture; 420 Adhesive spray head; 422 Adhesive nozzle; 211 First edge; 212 Second edge. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention and to more clearly define the scope of protection of the present invention, the present invention will be described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present invention, and are merely a part of the embodiments of the present invention. The specific and direct descriptions of related structures are only for the convenience of understanding the present invention, and the specific features do not necessarily or directly limit the scope of the present invention. Conventional choices and substitutions made by those skilled in the art under the guidance of the present invention should be considered within the scope of protection of the present invention.

[0044] Example 1: like Figures 1-8 As shown in the figure, the manufacturing process of an internally insulating battery casing described in this embodiment includes the following steps: S1. A battery casing 100 and an insulating liner 200 are configured. The battery casing 100 has a cavity 110 inside, and the shape of the insulating liner 200 is adapted to the shape of the cavity 110. The battery casing 100 is integrally formed by stretching a metal plate using a stretching process. Generally, the battery casing 100 is an aluminum casing, and the insulating liner 200 is integrally formed by blow molding of PP material.

[0045] S2. Apply the first adhesive evenly to the adhesive application area on the inner wall of the cavity 110 or the outer wall of the insulating liner 200 to form an adhesive layer 300 on the adhesive application area on the inner wall of the cavity 110 or the outer wall of the insulating liner 200. In order to achieve rapid curing and avoid affecting assembly, the first adhesive is generally not an electrolyte-resistant hot melt adhesive. The first adhesive is a reactive (PUR) hot melt adhesive, etc., or other known hot melt adhesives with adhesive function can be used. The specific coating method is as follows.

[0046] In step S2, the insulating liner 200 is fitted onto the face-changing fixture 230, with the outer wall of the insulating liner 200 on the side to be coated with the first adhesive facing the nozzle 221 of the glue sprayer 220. When the nozzle 221 of the glue sprayer 220 approaches the outer wall of the insulating liner 200 on the side to be coated with the first adhesive, the nozzle 221 of the glue sprayer 220 sprays the first adhesive and coats it onto the outer wall of one side of the insulating liner 200. At the same time, the glue sprayer 220 is driven to move so that the outer wall of one side of the insulating liner 200 is evenly coated with the first adhesive. After the outer wall of one side of the insulating liner 200 is coated, the face-changing fixture 230 moves, causing the insulating liner 200 to be face-changed multiple times. After each face-changing, the first adhesive application is repeated until each outer wall of the insulating liner 200 is evenly coated with the first adhesive. The adhesive sprayer 220 is mounted on a first machining center capable of X, Y, and Z-axis displacement. Therefore, during adhesive application, the adhesive sprayer 220 moves along the X, Y, and Z axes to evenly apply the first adhesive to the outer wall of the insulating liner 200. Figures 9-11 As shown; or, In step S2, the nozzle 221 of the glue sprayer 220 enters the cavity 110 and faces the glue application area of ​​the cavity 110. At this time, the nozzle 221 of the glue sprayer 220 is displaced so that the first adhesive is evenly applied to the glue application area. The glue sprayer 220 is mounted on a first machining center that can be displaced in three axes: X, Y, and Z. Therefore, during glue application, the glue sprayer 220 is displaced in the X, Y, and Z axes to evenly apply the first adhesive to the glue application area of ​​the cavity 110. The glue sprayer 220 is a commercially available hot melt glue sprayer.

[0047] S3. The battery casing 100 and the insulating liner 200 are respectively loaded onto the first assembly structure 4 and the second assembly structure 5 of the assembly equipment. When the first assembly structure 4 and the second assembly structure 5 of the assembly equipment are closed, the insulating liner 200 is located inside the cavity 110, and the outer wall of the insulating liner 200 is bonded and fixed to the inner wall of the cavity 110 by the adhesive layer 300. Figures 15-26 As shown, the method allows the insulating liner 200 to be tightly bonded to the inner wall of the cavity 110, and the bonding surface is fully covered, so that the insulating liner 200 has strong adhesion after bonding and is not easy to fall off. The specific structures of the first assembly structure 4 and the second assembly structure 5 of the assembly equipment are as follows.

[0048] Further, in step S3, the second assembly structure 5 of the assembly equipment includes an outwardly expanding assembly body adapted to the shape of the insulating liner 200. The outwardly expanding assembly body is coaxially arranged with the first assembly structure 4 of the assembly equipment. The insulating liner 200 is fitted onto the outwardly expanding assembly body. The battery case 100 is positioned on the first assembly structure 4 of the assembly equipment. The first assembly structure 4 of the assembly equipment includes a positioning sleeve 42. The positioning sleeve 42 is provided with a positioning cavity 421 for adapting the shape of the battery case 100. The battery case 100 is placed in the positioning cavity 421 for positioning. When the outward-expanding assembly or the first assembly structure 4 translates along the axis, the outward-expanding assembly is inserted into the cavity 110 of the battery case 100, so that the bottom outer wall of the insulating liner 200 and the bottom inner wall of the cavity 110 are tightly bonded together by the adhesive layer 300. The heating element in the outward-expanding assembly works to heat and soften the insulating liner 200. After heating is completed, the multiple movable parts of the outward-expanding assembly move outward and expand, causing the peripheral sidewall of the insulating liner 200 to expand outward and be tightly bonded to the inner peripheral wall of the cavity 110 by the adhesive layer 300. The method is reasonably set and improves the reliability of the bonding.

[0049] Specifically, the assembly equipment includes a base 3, a first assembly structure 4, and a second assembly structure 5. The base 3 is equipped with a sliding assembly. The first assembly structure 4 includes a fixed seat 41 and a positioning sleeve 42. The fixed seat 41 is connected to the sliding assembly and reciprocates along the base 3 under the drive of the sliding assembly. The positioning sleeve 42 is connected to the fixed seat 41 and reciprocates under the drive of the fixed seat 41. The positioning sleeve 42 has a positioning cavity 421 for accommodating the battery case 100. The shape of the positioning cavity 421 matches the shape of the battery case 100. Both ends of the positioning cavity 421 are open. One open end is connected to the fixed base 41, and the other open end is suspended and faces the second assembly structure 5. The fixed base 41 has a side groove 416. The open end of the positioning sleeve 42 is just stuck in the side groove 416, so that the positioning sleeve 42 can be limited on the fixed base 41. Then, the open end of the positioning sleeve 42 is provided with a screw hole 418. The screw hole 418 is connected to the fixed base 41 by bolts or other fasteners, thereby fixing the positioning sleeve 42 to the fixed base 41. The battery case 100 is inserted from the open end of the positioning sleeve 42 into the positioning cavity 421 of the positioning sleeve 42, thereby positioning the battery case 100.

[0050] The second assembly structure 5 also includes a mounting base 51 and six inner support members 53. The mounting base 51 is fixed to the base 3. The mounting base 51 has several grooves 52 on the side facing the first assembly structure 4. Each groove 52 has an inner support member 53 slidably connected to it. The six inner support members 53 are combined to form an outwardly expanding assembly. Each inner support member 53 includes a base 531 and an inner support block 532 connected to the base 531. The base 531 corresponds one-to-one with the groove 52 and is slidably fitted in the corresponding groove 52. In this embodiment, the bottom end of the inner support block 532 is integrally connected to the base 531, and the top end... As the suspended end faces the direction of the first assembly structure 4, since the insulating liner 200 is a cuboid box structure with a draft angle 21, the six inner support members 53 each have six inner support blocks 532. The six inner support blocks 532 can slide through their respective bases 531. After the six inner support blocks 532 slide together relative to each other, they form an assembly. The insulating liner 200 can be fitted onto the assembled inner support blocks 532. The outer peripheral walls of the six inner support blocks 532 fit and abut against the four inner peripheral walls of the insulating liner 200. The six inner support blocks 532 include two flat inner support blocks 53. Two strip-shaped inner support blocks 532 are arranged in parallel vertically, corresponding to the center of the upper and lower inner walls of the insulating liner 200. Two strip-shaped inner support blocks 532 are arranged in pairs on either side of the flat inner support blocks 532, with two strip-shaped inner support blocks 532 on each side arranged in parallel vertically, corresponding to the four corners of the insulating liner 200. The six inner support blocks 532 are distributed circumferentially along the inner peripheral wall of the insulating liner 200, that is, the six inner support members 53 are radially distributed along the periphery of the inner top block 55, and the inner walls of the six inner support blocks 532 enclose a guide... The inner wall of the guide groove 54 is inclined, that is, the inner walls of the six inner support blocks 532 are inclined, that is, the inner walls of the inner support blocks 532 are inclined surfaces, which gradually slope towards the center of the guide groove 54 from the bottom to the top. From the longitudinal section, the guide groove 54 forms a cone shape that narrows from the bottom to the top. Correspondingly, the inner top block 55 is also cone-shaped. When the inner top block 55 moves towards the top, it can simultaneously push the six inner support blocks 532 outward, so that the six inner support blocks 532 form an outward expansion action, thereby opening up the insulating liner 200.

[0051] In this embodiment, the peripheral walls of the inner top block 55 are inclined, that is, the four peripheral walls of the inner top block 55 are inclined inward from the bottom end to the suspended end, forming a frustum-shaped structure with a small top and a large bottom; two flat inner support blocks 532 are respectively located on the upper and lower sides of the center of the inner top block 55, and the inner walls of the flat inner support blocks 532 are correspondingly inclined inward from the bottom end to the suspended end, so that the inner walls of the flat inner support blocks 532 and the upper and lower side walls of the inner top block 55 form an adaptive fit. When the inner top block 55 moves from the bottom end to the top end, the inner top block 55 will move along the flat plate. The inclined inner wall of the inner support block 532 moves and gradually pushes the two flat inner support blocks 532 outward, so that the two flat inner support blocks 532 move outward respectively. The outer wall of the flat inner support block 532 is straight. At this time, the outer wall abuts against the corresponding inner peripheral wall of the insulating liner 200. As the flat inner support block 532 moves outward, the outer wall squeezes the corresponding inner peripheral wall of the insulating liner 200, thereby opening the softened insulating liner 200 so that the insulating liner 200 can fit against the inner wall of the battery case 100; two strip-shaped inner support blocks 532 is located to the left of the inner top block 55 and is distributed vertically. Two other strip-shaped inner support blocks 532 are located to the right of the inner top block 55 and are also distributed vertically. That is, the four strip-shaped inner support blocks 532 are located at the four corners of the inner top block 55. Since the four strip-shaped inner support blocks 532 are located at the four corners of the inner top block 55, each strip-shaped inner support block 532 has two mutually perpendicular surfaces facing the inner wall of the inner top block 55. These two surfaces are also inclined inwards from the bottom end to the suspended end to form mutually perpendicular inclined surfaces, which are respectively perpendicular to the inner wall of the inner top block 55. The two outer walls of one corner of the top block 55 abut against each other and form an adaptive fit, so that when the inner top block 55 moves from the bottom to the top, the four corners of the inner top block 55 will move along the corresponding two mutually perpendicular inclined surfaces and gradually push the strip-shaped inner support block 532 outward. It should be noted that the two mutually perpendicular inclined surfaces of the strip-shaped inner support block 532 are exactly matched with the two sides of one corner of the inner top block 55. In this way, the strip-shaped inner support block 532 can form an inclined outward expansion, so that the corner of the insulating liner 200 can be uniformly compressed.

[0052] It should be noted that, as Figures 17 to 20As shown, the base 531 slides within the groove 52 and is flush with the edge of the groove 52. The inner support block 532 extends forward relative to the base 531. The mounting base 51 has a baffle 510 at the opening of the groove 52. The baffle 510 surrounds the six inner support blocks 532, covering all the grooves 52, thereby positioning all the inner support members 53 and allowing them to slide along the grooves 52. Because the outward expansion of the inner support block 532 is small, the sliding path of the inner support member 53 is very short. A first reset elastic member 56 is provided between the groove 52 and the base 531. A blind hole 533 is provided on the inner sidewall of the groove 52, and the first reset elastic member 56 is installed in the blind hole 533. Inside, the first reset elastic element 56 is a spring, with one end abutting the bottom of the blind hole 533 and the other end abutting the base 531, so that the base 531 can elastically reset and translate along the slide groove 52. When the inner top block 55 does not push the inner support block 532, the six inner support blocks 532 are in a closed state under the elastic force of the first reset elastic element 56. At this time, the insulating liner 200 can be directly sleeved on the six inner support blocks 532. When the inner top block 55 translates and pushes the inner support block 532, the inner support block 532 compresses the first reset elastic element 56 and moves outward, thereby forming an outward expansion action. When the inner top block 55 retracts, the inner support block 532 returns to the closed state under the elastic force of the first reset elastic element 56.

[0053] Furthermore, the mounting base 51 is provided with a telescopic drive member 57, the telescopic end of which is connected to the inner top block 55, so that the inner top block 55 can reciprocate and slide along the guide groove 54 under the drive of the telescopic drive member 57.

[0054] Furthermore, such as Figure 21 As shown, the heating component 58 is a heating wire or heating tube disposed inside the inner support block 532. Each inner support block 532 has an internal mounting cavity or pipeline. The heating wire or heating tube is installed in the mounting cavity or pipeline. One end of the heating wire or heating tube is connected to the control center of the tooling via a wire running from the mounting base 51. Alternatively, the heating component 58 is a heating pipe disposed inside the inner support block 532. Each inner support block 532 has an internal heating pipe. The heating pipe is filled with a circulating heating liquid, such as hot water or other heating solvent, to heat the inner support block 532, and then heat the insulating liner 200 sleeved on the inner support block 532, so that the insulating liner 200 softens to the point that it can be deformed by the inner support block 532. The heating structures and methods of the above two heating components 58 adopt conventional technologies, and the specific working principles and structures are not described in detail here.

[0055] Furthermore, the sliding assembly includes a slider 43, a guide rail 44, and a translation drive 45. The guide rail 44 is disposed on the base 3, the slider 43 is slidably engaged with the guide rail 44, the translation drive 45 is connected to the slider 43 and drives the slider 43 to slide along the guide rail 44, and the fixed seat 41 is connected to the slider 43, thereby driving the first assembly structure 4 to move closer to or away from the second assembly structure 5. Furthermore, such as Figure 22 and 23 As shown, the fixing base 41 has a groove 411 at the opening end of the positioning sleeve 42, i.e., in the side groove 416. The fixing base 41 has a mounting hole 412 in the groove 411, which extends into the groove 411. A guide post 413 is inserted into the mounting hole 412. The top end of the guide post 413 passes through the mounting hole 412 and connects to the push plate 414. The guide post 413 can be telescopically inserted into the mounting hole 412, that is, the guide post 413 is movable relative to the fixing base 41, so that the push plate 414 is movable relative to the fixing base 41. The push plate 414 and the groove A second reset elastic element 415, which is a spring, is provided between the grooves 411. The push plate 414 and the groove 411 have opposing countersunk holes 417. The two ends of the second reset elastic element 415 are respectively installed in the two countersunk holes 417, meaning one end of the second reset elastic element 415 abuts against the push plate 414 and the other end abuts against the fixed seat 41. Thus, under the elastic force of the second reset elastic element 415, the push plate 414 is always in a popped-out state relative to the fixed seat 41. When the positioning sleeve 42 is fixedly connected to the fixed seat 41 and the battery casing 100 is positioned… After the positioning sleeve 42, the second reset elastic element 415 of the push plate 414 abuts against the bottom end of the battery case 100 under the elastic thrust of the push plate 414. As the battery case 100 moves towards the second assembly structure 5 driven by the first assembly structure 4, the second assembly structure 5, which is fitted with the insulating liner 200, is inserted into the battery case 100, so that the insulating liner 200 is fitted into the battery case 100. The first assembly structure 4 continues to drive the battery case 100 to move until it is pressed tightly until the bottom end of the insulating liner 200 is attached to the inner bottom end of the battery case 100. At this time, the push plate 414 presses tightly against the battery case 100. The bottom end is compressed and then the inner support 53 on the second assembly structure 5 softens and expands the insulating liner 200, so that the inner wall of the insulating liner 200 can be completely attached to the inner wall of the battery case 100. After the insulating liner 200 cools and solidifies, the first assembly structure 4 moves back, so that the inner support 53 and the insulating liner 200 are separated. At this time, the push plate 414 pushes the battery case 100 after hot pressing and bonding under the action of the second reset elastic member 415, thereby pushing the open end of the battery case 100 out of the positioning sleeve 42, so as to facilitate the removal of the battery case 100. The telescopic drive component 57 is a telescopic cylinder or electric actuator, such as the ACE series compact thin cylinder from Airtac; the translation drive component 45 is a telescopic cylinder or electric actuator, such as the RMS16X450 magnetic coupling rodless cylinder from Airtac, which is driven manually or automatically.

[0056] The specific working principle of the assembly equipment: The battery casing 100 is fitted inside the positioning sleeve 42, that is, the battery casing 100 is positioned on the first assembly structure 4 of the assembly equipment. The battery casing 100 is placed horizontally, and the opening of the battery casing 100 faces the translation direction of the first assembly structure 4. The battery casing 100 is translated towards the first assembly structure 4 under the action of the first assembly structure 4. The second assembly structure 5 has a heating component 58, which heats the second assembly structure 5, that is, heats the inner support member 53, so that the inner support member 53 is in a constant temperature or preheated state, thus making the insulation inner... The liner 200 remains under heat, accelerating the heating process. Then, the insulating liner 200 is fitted onto the second assembly structure 5 of the assembly equipment. The first assembly structure 4 pushes the battery casing 100 until it is fitted over the insulating liner 200 and pressed tightly until the bottom wall of the battery casing 100 and the insulating liner 200 are in contact, so that the insulating liner 200 is completely fitted inside the battery casing 100. At this point, because the peripheral wall of the insulating liner 200 has a draft angle 21, the bottom wall of the insulating liner 200 is in contact with the inner bottom wall of the battery casing 100, and the peripheral wall of the insulating liner 200 is in contact with the battery casing 100. The inner peripheral walls of the shell 100 cannot fit together, leaving a gap 20. This can be understood as the larger the height of the insulating liner 200, the larger the draft angle 21 it forms. Of course, this gap 20 can be formed in other situations, such as the natural bending caused by the softness of the insulating liner 200 material. The heating component 58 in the second assembly structure 5 continuously heats the inner support 53. Through heat conduction, the heat on the inner support 53 is transferred to the insulating liner 200, causing the insulating liner 200 to continuously soften under heat. The heating temperature here is generally related to the material of the insulating liner 200. The heating temperature of the heating component 58 is adjusted according to the softening temperature of different materials, and the heating time can be adjusted according to actual testing. For example, when the insulating liner 200 is made of plastic, the heating component usually uses a temperature range of 60 to 70 degrees to continuously heat the inner support 53. It should be noted that the heating component starts heating the inner support 53 before the insulating liner 200 is put on, so that the inner support 53 is in a constant temperature state, and then the insulating liner 200 is put on, which speeds up the heating rate of the insulating liner 200.Several inner support members 53 abut against the peripheral wall of the insulating liner 200 and expand outward simultaneously. The softened insulating liner 200 deforms and expands due to the outward expansion of the inner support members 53, so that the outer peripheral wall of the insulating liner 200 and the inner peripheral wall of the battery case 100 are attached and bonded to each other. The bonding is achieved through the adhesive layer 300. The detail required in this step is that the suspended end of the inner support block 532 presses the insulating liner 200 tightly, so that the bottom wall of the insulating liner 200 is pressed and adhered to the inner bottom wall of the battery case 100. At this time, the bottom wall of the insulating liner 200 and the inner bottom wall of the battery case 100 are tightly abutted, so that the bottom wall of the insulating liner 200 is tightly attached to the inner bottom wall of the battery case 100. Thus, when the inner support block 532 expands outward, the end face of the suspended end of the inner support block 532 moves along the bottom wall of the insulating liner 200, and the outer wall of the inner support block 532 presses the softened insulating liner 200 against the inner bottom wall of the battery case 100. The outer periphery of the battery casing 100 is pushed outward, causing the outer periphery of the insulating liner 200 to adhere tightly to the inner periphery of the battery casing 100, thus ensuring that the entire insulating liner 200 is completely adhered to the inner wall of the battery casing 100. This is maintained for a certain period of time, allowing the insulating liner 200 to be completely bonded to the inner wall of the battery casing 100 through the adhesive layer 300. The heating component 58 stops heating, allowing the insulating liner 200 to cool and solidify. Simultaneously, the adhesive between the insulating liner 200 and the battery casing 100 also cools and solidifies. Then, the inner support 53 resets and detaches from the insulating liner 200. The first assembly structure 4 moves away from the second assembly structure 5, and the push plate 414 is no longer under pressure, pushing the battery casing 100 forward, causing the open end of the battery casing 100 to protrude from the open end of the positioning sleeve 42. This allows the battery casing to be removed after hot pressing and bonding. The cooling time here is...

[0057] like Figure 26 As shown, before the insulating liner 200 is fitted into the battery case 100 and then heat-pressed, the suspended end of the inner support block 532 is tightly attached to the bottom wall of the insulating liner 200. The peripheral wall of the suspended end of the inner support block 532 is attached to the inner wall of the insulating liner 200 near the bottom of the insulating liner 200. As the inner top block 55 moves toward the suspended end, the upper and lower flat inner support blocks 532 move up and down respectively under the push of the inner top block 55. The strip-shaped inner support block 532 moves obliquely outward relative to the inner top block 55. That is, the six inner support blocks 532 move radially outward relative to the inner top block 55 at the same time, so that the inner support blocks 532 gradually open the insulating liner 200.

[0058] Of course, the second assembly structure 5 is also equipped with a temperature sensor for monitoring the heating temperature of the heating component 58, as well as a related control center, so that the entire process can be centrally controlled. The structure and working principle of the control center are conventional technologies and will not be described in detail here.

[0059] Furthermore, such as Figure 27As shown, a cooling pipe 59 is provided inside the positioning sleeve 42. The cooling pipe 59 is located inside the positioning sleeve 42 and contains coolant to accelerate the cooling of the insulating liner 200 after hot pressing and bonding. In this embodiment, several cooling pipes 59 are distributed circumferentially and parallel to each other inside the positioning sleeve 42. Each cooling pipe 59 has an inlet 591 and an outlet 592, both of which are located on the outer wall of the positioning sleeve 42. Both the inlet 591 and the outlet 592 are used to install connectors, which are used to connect to external or base 3 cooling equipment. Coolant enters the cooling pipe 59 through the connector from the inlet 591 and then exits from the outlet 592, thereby realizing the circulation of coolant within the cooling pipe 59. To facilitate the processing of the cooling pipe 59 on the positioning sleeve 42, holes are made in the outer peripheral wall surface of the positioning sleeve 42 to form the cooling pipe 59. Plugs 593 are provided on these holes to prevent water leakage.

[0060] S4. A second adhesive 400 resistant to electrolyte is continuously applied between the opening edge 210 of the insulating liner 200 and the inner wall of the cavity 110. The second adhesive 400 connects the opening edge 210 of the insulating liner 200 to the inner wall of the cavity 110 to seal the bonding section of the adhesive layer 300. The second adhesive 400 is continuously applied along the opening of the insulating liner 200, forming a linear structure after application. The second adhesive 400 resistant to electrolyte is generally a polyolefin (PO) hot melt adhesive, etc. Alternatively, other known electrolyte-resistant hot melt adhesives can be used. When the second adhesive 400 is applied, the battery case 100 with the insulating liner 200 fixed is positioned on the positioning fixture 410. When the nozzle 422 of the spray nozzle 420 approaches the opening edge 210 of the insulating liner 200, the spray nozzle 420 moves along the trajectory of the opening edge 210 of the insulating liner 200. During the movement, the nozzle 422 of the spray nozzle 420 sprays out the second adhesive 400 and applies it to the opening edge 210 of the insulating liner 200.

[0061] In this embodiment, the positioning fixture 410 is vertically positioned so that the battery casing 100, to which the insulating liner 200 is fixed, is vertically positioned on the positioning fixture 410, and the opening of the battery casing 100 faces the spray nozzle 420. The spray nozzle 420 is vertically positioned so that the axis of the nozzle 422 is parallel to the axis of the positioning fixture 410. When the second adhesive 400 is applied, the movement trajectory of the spray nozzle 420 is a circular movement trajectory along the opening edge 210 of the insulating liner 200; or The positioning fixture 410 is inclined so that the battery case 100, to which the insulating liner 200 is fixed, is positioned at an angle on the positioning fixture 410. The opening of the battery case 100 faces the spray nozzle 420. The spray nozzle 420 is inclined and the tilt direction of the spray nozzle 420 is the same as that of the positioning fixture 410, so that the axis of the nozzle 422 of the spray nozzle 420 is parallel to the axis of the positioning fixture 410. When the second adhesive 400 is applied, the movement trajectory of the spray nozzle 420 is a circular movement trajectory along the opening edge 210 of the insulating liner 200.

[0062] In another embodiment, such as Figures 12-14 As shown, the positioning fixture 410 is inclined so that the battery case 100 with the insulating inner liner 200 is positioned in an inclined position on the positioning fixture 410, and the glue spraying head 420 is vertically arranged. The angle between the axis of the glue nozzle 422 of the glue spraying head 420 and the axis of the positioning fixture 410 is an obtuse angle. The opening edge 210 of the insulating inner liner 200 includes two opposing first edges 211 and two opposing second edges 212. When the battery case 100 with the insulating inner liner 200 is positioned horizontally and tilted on the positioning fixture 410, the glue spray head 420 moves in a straight line along the trajectory of the first edge 211 to apply the second adhesive 400 to the first edge 211. When the battery case 100 with the insulating inner liner 200 is positioned vertically and tilted on the positioning fixture 410, the glue spray head 420 moves in a straight line along the trajectory of the second edge 212 to apply the second adhesive 400 to the second edge 212.

[0063] The positioning fixture 410 mentioned above adopts an L-shaped positioning plate, on which a workpiece positioning groove for positioning the battery case is formed. The adhesive spraying head 420 mentioned above is installed on a second machining center that can be moved along the X, Y, and Z axes. Therefore, when applying adhesive, the adhesive spraying head 420 is moved along the X, Y, and Z axes to evenly apply the second adhesive 400 to the opening edge 210 of the insulating liner 200. At the same time, the application of the second adhesive 400 can be selected and implemented according to the actual situation. The adhesive spraying head 420 is a commercially available hot melt adhesive spraying head 420.

[0064] After step S4, the performance and appearance of the manufactured inner insulating battery casing 100 can be checked, and the qualified inner insulating battery casing 100 can be packaged and stored.

[0065] Example 2: The manufacturing process of the inner insulating battery shell described in this embodiment is similar to that of Embodiment 1, but the difference is that a surface pretreatment step for the outer wall of the insulating liner 200 is provided between step S1 and step S2. The step includes surface pretreatment with a treatment agent, flame surface pretreatment, corona surface pretreatment or plasma surface treatment.

[0066] The surface pretreatment involves wiping the outer wall of the insulating liner 200 with an alcohol-soaked wiping agent (cotton cloth, cotton, or wiping cloth) to clean it. A chlorinated polyolefin modified primer is then applied to the cleaned outer wall of the insulating liner 200, and the process is completed after the outer wall of the insulating liner 200 dries. This surface pretreatment improves surface properties and provides a wetting effect to the outer wall of the insulating liner 200, making it easier for the first adhesive to adhere to the outer wall of the insulating liner 200.

[0067] The surface pretreatment involves wiping the outer wall of the insulating liner 200 with an alcohol-soaked wiping material (cotton cloth, cotton, or wiping cloth) to clean it. The blue outer flame from the flame gun sweeps across the cleaned outer wall of the insulating liner 200 at a uniform and rapid speed. The distance between the nozzle of the flame gun and the outer wall of the insulating liner 200 is 10-15cm, preferably 12cm, and the dwell time during each sweep is ≤1 second. This surface pretreatment improves the surface properties and wets the outer wall of the insulating liner 200, making it easier for the first adhesive to adhere to the outer wall of the insulating liner 200.

[0068] The surface pretreatment for corona treatment involves wiping the outer wall of the insulating liner 200 with an alcohol-soaked wiping agent to clean it. The cleaned insulating liner 200 is then passed through the corona space of the corona machine at a uniform speed, with its outer wall facing the corona roller of the corona machine during passage, thus performing corona treatment on the outer wall of the insulating liner 200. The working power of the corona roller is 500-1000W, preferably 800W. The distance between the outer wall of the insulating liner 200 and the corona roller of the corona machine is 2-3mm, preferably 2.5mm. The surface pretreatment is an etching surface treatment, which creates a rough structure on the outer wall of the insulating liner 200, making it easier for the first adhesive to adhere to the outer wall of the insulating liner 200.

[0069] Plasma surface treatment involves wiping the outer wall of the insulating liner 200 with an alcohol-soaked wiping agent to clean it. Plasma sprayed from a plasma gun sweeps across the cleaned outer wall of the insulating liner 200 at a uniform and rapid speed. The distance between the nozzle of the plasma gun and the outer wall of the insulating liner 200 is 5-15 mm, and the displacement speed of the plasma gun sweeping across the cleaned outer wall of the insulating liner 200 is 50-100 mm / s, preferably 70 mm / s. The surface pretreatment is etching, which creates a rough structure on the outer wall of the insulating liner 200, making it easier for the first adhesive to adhere to the outer wall of the insulating liner 200.

[0070] The four methods of surface pretreatment of the insulating liner 200 mentioned above can be selected according to the actual situation.

[0071] Example 3: The manufacturing process of an internally insulating battery casing described in this embodiment is similar to that of Embodiment 1, but the difference is that a step of surface pretreatment of at least a portion of the inner wall of the cavity 110 of the battery casing 100 to form an adhesive coating area is provided between step S1 and step S2. The step includes surface pretreatment by grinding, surface pretreatment by etching, surface pretreatment by primer, or surface pretreatment by sandblasting.

[0072] The surface is pretreated by wiping at least part of the inner wall of the cavity 110 of the battery case 100 with an alcohol-soaked wiping agent to clean it. At least part of the inner wall of the cavity 110 of the battery case 100 is then sanded with sandpaper. After sanding, an adhesive application area is formed. The adhesive application area is then cleaned and wiped again with an alcohol-soaked wiping agent. The sandpaper used is 400-800 grit sandpaper, preferably 500 grit sandpaper. Sanding is done in the same direction. Therefore, the surface pretreatment by wiping creates a micro-rough structure on the inner wall of the cavity 110, thereby improving the adhesion of the first adhesive to the battery case 100.

[0073] For surface pretreatment against corrosion, at least part of the inner wall of the cavity 110 of the battery case 100 is cleaned with alkaline degreasing powder to remove oil stains. The inner wall of the cavity 110 of the battery case 100 is then rinsed with clean water multiple times to remove the alkaline degreasing powder, generally 2-3 times. The battery case 100 is then subjected to 5% corrosion at room temperature. Immerse the battery casing 100 in a dilute sulfuric acid solution or an environmentally friendly aluminum micro-etching agent for 30-60 seconds, generally 60 seconds, until the inner wall of the cavity 110 of the battery casing 100 uniformly loses its gloss. This indicates that the treatment is complete and an adhesive coating area is formed on the inner wall of the cavity 110 of the battery casing 100. Then, rinse the entire battery casing 100 with clean water several times after the inner wall loses its gloss. Generally, rinse with clean water three times. After rinsing, dry the casing using hot air at 80℃. After drying, the adhesive coating should be completed within 30 minutes. This process removes the oxide layer and forms a porous microstructure on the surface of the inner wall of the aluminum casing, thereby improving the anchoring effect of the adhesive on the surface of the inner wall of the aluminum casing and making the first adhesive bond to the battery casing 100 more firmly.

[0074] For the surface pretreatment of the primer, at least part of the inner wall of the cavity 110 of the battery case 100 is wiped with an alcohol-soaked wiping agent to clean it. After the inner wall of the cavity 110 of the battery case 100 has been cleaned, a silane solution is applied and then dried. After drying, the adhesive coating area is formed. For the preparation of the silane solution: commonly used models KH560 (suitable for epoxy adhesive) and KH550 (suitable for polyurethane / instant adhesive) are dissolved at a ratio of 2% in a mixed solvent of 95% anhydrous ethanol + 5% deionized water, stirred evenly, and allowed to stand for hydrolysis for 5 minutes to obtain the silane solution. Drying is carried out by air drying or hot air drying at 80°C. This surface pretreatment method allows one end to form a covalent bond with the hydroxyl groups on the aluminum surface, and the other end to react with the active groups of the adhesive, thereby improving the adhesion of the first adhesive to the battery case 100.

[0075] The surface pretreatment involves cleaning at least a portion of the inner wall of the cavity 110 of the battery casing 100 with isopropyl alcohol. The cleaned inner wall is then sandblasted to create a rough surface. After blowing away the sand and dust with an air gun, the surface is dried. Once dried, the rough surface becomes the adhesive application area. The sand used is 80-120 mesh glass abrasive, the sandblasting pressure is 0.3-0.5 MPa, and the distance between the sandblasting nozzle and the cleaned inner wall is 10-15 cm, preferably 12 cm. The sandblasting nozzle evenly sweeps across the cleaned inner wall. Drying is done by air drying, and adhesive must be applied within one hour of drying. This surface pretreatment removes the oxide layer and oil, creating a uniform micro-rough surface, improving the anchoring effect of the first adhesive on the battery casing 100. Typically, 100 mesh glass abrasive is used, and the sandblasting pressure is 0.4 MPa.

[0076] The above four methods for surface pretreatment of at least part of the inner wall of the cavity 110 of the battery case 100 can be selected according to the actual situation.

[0077] Finally, the insulating liner 200 in the inner insulating battery shell 100 prepared according to Examples 1 to 3 is not easy to fall off from the inner wall of the battery shell 100, making the insulating liner 200 more firmly installed on the battery shell 100, and the use of the inner insulating battery shell 100 is also safer and more reliable. At the same time, the first adhesive in this invention is a hot melt adhesive, so that when the insulating liner 200 is heated, the hot melt adhesive can also melt accordingly, so that when the insulating liner 200 is stretched and deformed, the melted hot melt adhesive can also be squeezed to form a uniform distribution. This not only facilitates bonding, but also prevents the insulating liner 200 from being uneven due to uneven glue distribution.

Claims

1. A manufacturing process for an internally insulating battery casing, characterized in that, The steps include the following: S1. A battery case (100) and an insulating liner (200) are configured. The battery case (100) has a cavity (110) inside. The shape of the insulating liner (200) is adapted to the shape of the cavity (110). S2. Apply a first adhesive uniformly to the adhesive application area on the inner wall of the cavity (110) or the outer wall of the insulating liner (200) to form an adhesive layer (300) on the adhesive application area on the inner wall of the cavity (110) or the outer wall of the insulating liner (200). In step S2, the insulating liner (200) is fitted onto the face-changing fixture (230), and the outer wall of the insulating liner (200) on the side that needs to be coated with the first adhesive faces the nozzle (221) of the glue sprayer (220). When the nozzle (221) of the glue sprayer (220) approaches the outer wall of the insulating liner (200) on the side that needs to be coated with the first adhesive, the nozzle (221) of the glue sprayer (220) sprays out the first adhesive and coats it on the outer wall of the insulating liner (200). At the same time, the glue sprayer (220) is driven to move so that the outer wall of the insulating liner (200) is evenly coated with the first adhesive. After the outer wall of the insulating liner (200) is coated, the face-changing fixture (230) moves so that the insulating liner (200) is changed multiple times. After each face-changing, the first adhesive coating is performed again until the outer wall of each side of the insulating liner (200) is evenly coated with the first adhesive. S3. The battery case (100) and the insulating liner (200) are respectively loaded onto the first assembly structure (4) and the second assembly structure (5) of the assembly equipment. When the first assembly structure (4) and the second assembly structure (5) of the assembly equipment are closed, the insulating liner (200) is located inside the cavity (110), and the outer wall of the insulating liner (200) is bonded and fixed to the inner wall of the cavity (110) by the adhesive layer (300). In step S3, the second assembly structure (5) of the assembly equipment includes an outwardly expanding assembly body adapted to the shape of the insulating liner (200). The insulating liner (200) is fitted onto the outwardly expanding assembly body. The battery case (100) is positioned on the first assembly structure (4) of the assembly equipment. The outwardly expanding assembly body and the first assembly structure (4) of the assembly equipment are coaxially arranged. When the outwardly expanding assembly body or the first assembly structure (4) is translated along the axis, the outwardly expanding assembly body is inserted into the battery case (100). Inside the cavity (110), the bottom outer wall of the insulating liner (200) is tightly bonded to the bottom inner wall of the cavity (110) through an adhesive layer (300), and the heating element in the outward expansion assembly works to heat and soften the insulating liner (200). After the heating is completed, the multiple movable parts of the outward expansion assembly move outward and expand, causing the peripheral sidewall of the insulating liner (200) to expand outward and be tightly bonded to the inner peripheral wall of the cavity (110) through the adhesive layer (300); S4. A second adhesive (400) resistant to electrolyte is continuously applied between the opening edge (210) of the insulating liner (200) and the inner wall of the cavity (110). The second adhesive (400) connects the opening edge (210) of the insulating liner (200) to the inner wall of the cavity (110) to seal the bonding section of the adhesive layer (300), and the second adhesive (400) is continuously provided along the opening of the insulating liner (200).

2. The manufacturing process of an inner insulating battery casing according to claim 1, characterized in that, In step S4, the battery case (100) with the insulating liner (200) fixed is positioned on the positioning fixture (410). When the nozzle (422) of the spray nozzle (420) approaches the opening edge (210) of the insulating liner (200), the spray nozzle (420) moves along the trajectory of the opening edge (210) of the insulating liner (200). During the movement, the nozzle (422) of the spray nozzle (420) sprays out the second adhesive (400) and coats it onto the opening edge (210) of the insulating liner (200).

3. The manufacturing process of an internally insulating battery casing according to claim 2, characterized in that, The positioning fixture (410) is vertically positioned so that the battery case (100) with the insulating liner (200) fixed thereon is vertically positioned on the positioning fixture (410), and the opening of the battery case (100) faces the spray nozzle (420). The spray nozzle (420) is vertically positioned so that the axis of the nozzle (422) is parallel to the axis of the positioning fixture (410). When the second adhesive (400) is applied, the movement trajectory of the spray nozzle (420) is a circular movement trajectory along the opening edge (210) of the insulating liner (200); or, The positioning fixture (410) is inclined so that the battery case (100) with the insulating liner (200) is positioned in an inclined position on the positioning fixture (410), and the opening of the battery case (100) faces the spray nozzle (420). The spray nozzle (420) is inclined so that the axis of the nozzle (422) of the spray nozzle (420) is parallel to the axis of the positioning fixture (410). When the second adhesive (400) is applied, the movement trajectory of the spray nozzle (420) is a circular movement trajectory along the opening edge (210) of the insulating liner (200).

4. The manufacturing process of an inner insulating battery casing according to claim 2, characterized in that, The positioning fixture (410) is inclined so that the battery case (100) with the insulating liner (200) is positioned in an inclined manner on the positioning fixture (410), and the glue spraying head (420) is vertically arranged. The angle between the axis of the glue nozzle (422) of the glue spraying head (420) and the axis of the positioning fixture (410) is an obtuse angle. The opening edge (210) of the insulating liner (200) includes two opposing first edges (211) and two opposing second edges (212). When the battery case (100) with the insulating inner liner (200) is positioned horizontally and tilted on the positioning fixture (410), the glue spray head (420) moves in a straight line along the trajectory of the first edge (211) to apply the second adhesive (400) to the first edge (211). When the battery case (100) with the insulating inner liner (200) is positioned vertically and tilted on the positioning fixture (410), the glue spray head (420) moves in a straight line along the trajectory of the second edge (212) to apply the second adhesive (400) to the second edge (212).

5. The manufacturing process of an internally insulating battery casing according to claim 1, characterized in that, Between step S1 and step S2, there is a step of surface pretreatment of the outer wall of the insulating liner (200), which includes surface pretreatment with a treatment agent, flame surface pretreatment, corona surface pretreatment or plasma surface treatment. The surface of the treatment agent is pretreated by wiping the outer wall of the insulating liner (200) with a wiping body soaked in alcohol to clean it. Chlorinated polyolefin modified primer is applied to the outer wall of the cleaned insulating liner (200) and the process is completed after the outer wall of the insulating liner (200) dries. Flame surface pretreatment: The outer wall of the insulating liner (200) is wiped with a wiping body soaked in alcohol to clean it. The blue outer flame of the flame gun sweeps across the cleaned outer wall of the insulating liner (200) at a uniform and fast speed. The distance between the nozzle of the flame gun and the outer wall of the insulating liner (200) is 10-15cm, and the dwell time during a single sweep is ≤1 second. Corona surface pretreatment: The outer wall of the insulating liner (200) is wiped with a wiping body soaked in alcohol to clean it. The cleaned insulating liner (200) is passed through the corona space of the corona machine at a uniform speed, and the outer wall of the cleaned insulating liner (200) faces the corona roller of the corona machine when passing through. The working power of the corona roller is 500-1000W, and the distance between the outer wall of the insulating liner (200) and the corona roller of the corona machine is 2-3mm. Plasma surface treatment involves wiping the outer wall of the insulating liner (200) with an alcohol-soaked wiping agent to clean it. Plasma sprayed from the plasma gun sweeps across the cleaned outer wall of the insulating liner (200) at a uniform and rapid speed. The distance between the nozzle of the plasma gun and the outer wall of the insulating liner (200) is 5-15 mm, and the displacement speed of the plasma gun sweeping across the cleaned outer wall of the insulating liner (200) is 50-100 mm / s.

6. The manufacturing process of an internally insulating battery casing according to claim 1, characterized in that, Between step S1 and step S2, there is a step of performing surface pretreatment on at least part of the inner wall of the cavity (110) of the battery case (100) to form an adhesive coating area. The step includes surface pretreatment by grinding, surface pretreatment by etching, surface pretreatment by primer, or surface pretreatment by sandblasting. For surface pretreatment, at least part of the inner wall of the cavity (110) of the battery case (100) is wiped with a wiping body soaked in alcohol to clean it. At least part of the inner wall of the cavity (110) of the battery case (100) is polished with sandpaper. After polishing, an adhesive area is formed. Then, the adhesive area is cleaned and wiped again with a wiping body soaked in alcohol. For surface corrosion pretreatment, use alkaline degreasing powder to remove oil stains from at least part of the inner wall of the cavity (110) of the battery case (100). Rinse the inner wall of the cavity (110) of the battery case (100) with clean water multiple times to remove the alkaline degreasing powder. Then, immerse the battery case (100) in a 5% dilute sulfuric acid solution or an environmentally friendly aluminum micro-etching agent at room temperature for 30-60 seconds until the inner wall of the cavity (110) of the battery case (100) is uniformly dull, indicating that the treatment is complete. A coating area is formed on the inner wall of the cavity (110) of the battery case (100). Then, rinse the entire battery case (100) with clean water multiple times after the inner wall is dulled. After rinsing, dry the battery case (100). The surface of the primer is pretreated by wiping at least part of the inner wall of the cavity (110) of the battery case (100) with a wiping body soaked in alcohol to clean it. After the inner wall of the cavity (110) of the battery case (100) has been cleaned, a silane solution is applied and then dried. After drying, the adhesive area is formed. The surface is pretreated by sandblasting. At least part of the inner wall of the cavity (110) of the battery case (100) is cleaned with isopropyl alcohol. The inner wall of the cavity (110) of the battery case (100) after cleaning is sandblasted to form a rough surface. The sand and dust on the rough surface are blown away with an air gun and then dried. After drying, the rough surface is used as the adhesive coating area.

7. The manufacturing process of an inner insulating battery casing according to claim 1, characterized in that, The first assembly structure (4) of the assembly equipment includes a positioning sleeve (42), on which a positioning cavity is provided for the shape adaptation of the battery case (100), and the battery case (100) is placed in the positioning cavity for positioning.

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