Battery insulating housing structure and manufacturing molding process

Abstract

The application discloses a battery insulating shell structure and a manufacturing forming process. The shell structure comprises an outer shell and an inner sleeve shell. The outer shell is provided with a first opening on one side. The inner sleeve shell is made of insulating material. The inner sleeve shell is embedded in the outer shell from the first opening. One end of the inner sleeve shell is provided with a second opening in the same direction as the first opening. A connecting ring is arranged between the outer periphery of the inner sleeve shell at the second opening and the inner wall of the outer shell. The connecting ring is fixedly connected with the outer periphery wall of the inner sleeve shell through welding. The connecting ring is fixedly connected with the inner wall of the outer shell through welding. The application comprises an outer shell and an inner sleeve shell embedded in the outer shell. A connecting ring is arranged between the inner sleeve shell and the outer shell. The connecting ring fixedly connects the outer shell and the inner sleeve shell through welding. The inner sleeve shell is made of insulating material, so that an insulating cavity is formed in the shell structure.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to the structure and manufacturing process of battery insulating casing. Background Technology

[0002] Lithium batteries typically consist of a casing and a battery module located inside the casing. The battery module and the casing need to be insulated. Therefore, after the casing is manufactured, an insulating material layer is usually sprayed onto the inner wall of the casing to meet the insulation requirements. Alternatively, after the battery module is manufactured, it is insulated, such as by wrapping or injection molding, to isolate the battery module from the casing. Although this achieves the insulation effect, it has the problems of high manufacturing cost, low production capacity, and low process reliability. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the aforementioned technologies by designing a battery insulating shell structure and a manufacturing process.

[0004] This invention includes a battery insulating shell structure, comprising an outer shell and an inner liner shell. The outer shell has a first opening on one side. The inner liner shell is made of insulating material and is embedded in the outer shell through the first opening. One end of the inner liner shell has a second opening in the same direction as the first opening. A connecting ring is provided between the outer periphery of the inner liner shell at the second opening and the inner wall of the outer shell. The connecting ring is fixedly connected to the outer peripheral wall of the inner liner shell by welding, and the connecting ring is fixedly connected to the inner wall of the outer shell by welding.

[0005] Preferably, the outer shell is formed by a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate to form a box structure with an opening, wherein the opening is the first opening.

[0006] Further optimization involves forming the first, second, and third side plates by bending one plate from end to end; the fourth side plate and the bottom plate are fixedly connected by welding, or the fourth side plate and the bottom plate are integrally formed.

[0007] Further optimization involves the first, second, third, and fourth side plates being formed by bending and connecting a single plate end to end to create a box structure with openings at both ends. The seams at the beginning and end are located on one of the narrower side plates and are connected by welding. The outer shell forms a first opening and a third opening at its two ends, respectively, and the bottom plate is welded to the third opening.

[0008] Further optimization involves providing grooves on the inner walls of the first, second, third, and fourth side plates. An intermediate layer is provided between the outer shell and the inner liner shell. The intermediate layer is connected to the inner walls of the four side plates and forms a constant temperature channel with the grooves. A heating source or a cooling source is poured into the constant temperature channel.

[0009] Preferably, the connecting ring has a square cross-section, one side of the connecting ring is attached and welded to the inner liner shell, and the other side of the connecting ring is attached and welded to the inner side wall of the outer shell; preferably, the inner wall of the outer shell is provided with a stepped surface, and the side and bottom of the connecting ring facing the inner side wall of the outer shell are engaged with the stepped surface; the second opening of the inner liner shell is bent outward to form a bent portion, or the outer peripheral wall of the inner liner shell near the second opening protrudes circumferentially to form a bent portion, and the side and top of the connecting ring facing the outer peripheral wall of the inner liner shell are engaged with the bent portion.

[0010] Further optimization involves making the inner liner shell an insulating material, and making the connecting ring the same material as the outer shell, which is metal.

[0011] The present invention also includes a manufacturing process comprising the following steps:

[0012] Step 1: Prepare the board body by creating grooves on the inner wall surface of the board body, with the grooves extending to opposite ends of the board body;

[0013] Step 2: The sheet metal is bent and welded to form the outer shell;

[0014] Step 3: Prepare the sheet material. After bending and welding, the sheet material is formed into a tubular component. The open end of the tubular component is longitudinally cut to form a connecting ring.

[0015] Step 4: Prepare the inner liner shell. Fit the connecting ring onto the second opening of the inner liner shell. One side of the connecting ring should be attached to the outer peripheral wall of the inner liner shell, and the other side should be used as the welding operation surface.

[0016] Step 5: Perform dense, continuous spot welding on the welding operation surface to fix the connecting ring to the inner liner shell. The spot welding trajectory is along the circumference of the connecting ring and located in the middle of the welding operation surface.

[0017] Step 6: Insert the inner sleeve with the welded connecting ring into the outer shell, so that the welding operation surface of the connecting ring is in contact with the inner wall of the outer shell.

[0018] Step 7: Perform dense, continuous spot welding along the intersection line between the top of the welding operation surface and the inner wall of the outer shell.

[0019] Preferably, in step two, the plate body includes plate body one and plate body two.

[0020] Plate one is bent into a C-shaped plate with a right-angle bend, and plate two is bent into an L-shaped plate. The L-shaped plate and the C-shaped plate are welded together to form an outer shell with a first opening; or

[0021] Plate 1 is bent into a C-shaped plate with a right angle. Then, the two open ends of the C-shaped plate are bent at right angles and joined together, forming a seam. The seam is fixedly connected by welding. Plate 2 is welded to its bottom as a base plate, thus forming an outer shell with the first opening.

[0022] The present invention also includes another manufacturing process comprising the following steps:

[0023] Step 1: Prepare the plate. The plate is stamped to form an outer shell with one end having the first opening.

[0024] Step 2: Create grooves on the inner wall surface of the outer casing, with the grooves extending to opposite ends of the outer casing;

[0025] Step 3: Prepare the sheet material. After bending and welding, the sheet material is formed into a tubular component. The open end of the tubular component is longitudinally cut to form a connecting ring.

[0026] Step 4: Prepare the inner liner shell. Fit the connecting ring onto the second opening of the inner liner shell. One side of the connecting ring is attached to the outer peripheral wall of the inner liner shell, and the other side serves as the welding operation surface.

[0027] Step 5: Perform dense spot welding on the welding operation surface to fix the connecting ring to the inner liner shell. The spot welding trajectory is along the circumference of the connecting ring and located in the middle of the welding operation surface.

[0028] Step 6: Insert the inner sleeve with the welded connecting ring into the outer shell, so that the welding operation surface of the connecting ring is in contact with the inner wall of the outer shell.

[0029] Step 7: Perform dense, continuous spot welding along the intersection line between the top of the welding operation surface and the inner wall of the outer shell.

[0030] The technical advantages of this invention are as follows: the outer shell has a first opening, and the inner liner is fitted into the outer shell through the first opening. The inner liner has a second opening on the same side as the first opening. The inner liner is made of insulating material, thus forming an insulating cavity. A connecting ring is provided between the outer peripheral wall of the inner liner at the first opening and the inner wall of the outer shell. The connecting ring is welded to both the inner liner and the outer shell, thus fixing the inner liner and the outer shell together. Simultaneously, both the outer shell and the connecting ring are made of metal, such as aluminum, while the inner liner is made of insulating material, such as plastic. The outer shell and the connecting ring are welded using the same material, while the connecting ring and the inner liner are welded using dissimilar materials. Laser welding and through-welding are used for fixing, respectively. By employing different welding methods, the connection is stable and firm. The insulation life of the outer shell is longer; the opening of the inner liner shell is bent to form a bend, which engages with the connecting ring, improving the welding reliability between the connecting ring and the inner liner shell and preventing the inner liner shell from shifting after the welded part comes off, thus ensuring the stability of the inner liner shell. It also facilitates the addition of an end cap at the first opening; the inner wall of the outer shell has a groove. After the inner liner shell is installed, the outer peripheral wall of the inner liner shell and the groove form a constant temperature channel. The constant temperature channel is filled with a heat source or a cooling source, so that the entire shell can be in a heated, cooled or constant temperature state. In addition, there is an intermediate layer between the inner liner shell and the outer shell. The intermediate layer is welded to the inner wall of the outer shell and forms a constant temperature channel with the groove, avoiding leakage of the constant temperature channel due to uneven contact between the inner liner shell and the inner wall of the outer shell. Attached Figure Description

[0031] Figure 1 This is an overall structural appearance diagram of the present invention;

[0032] Figure 2 This is a structural diagram of Embodiment 1;

[0033] Figure 3 This is a structural diagram of Embodiment 2;

[0034] Figure 4 This is a structural diagram of Embodiment 3;

[0035] Figure 5 The structure is when the inner wall of the inner liner shell has a stepped surface. Figure 1 ;

[0036] Figure 6 The structure is when the inner wall of the inner liner shell has a stepped surface. Figure 2 ;

[0037] Figure 7 This is a structural diagram when the inner wall of the inner liner shell is a plane;

[0038] Figure 8 This is a structural diagram of the inner lining shell with a bent section;

[0039] Figure 9 This is a structural diagram of the constant temperature channel;

[0040] Figure 10 This is a diagram showing the positioning structure of the inner liner and connecting ring when using tooling fixtures;

[0041] Figure 11 This is a schematic diagram of the connection line between the connecting ring and the inner wall of the outer shell.

[0042] In the diagram: 1. Outer shell; 11. First opening; 12. First side plate; 13. Second side plate; 14. Third side plate; 15. Fourth side plate; 16. Base plate; 17. Third opening; 18. Fourth opening; 19. Stepped surface; 110. Groove; 111. Seam line; 112. Constant temperature channel; 2. Inner liner shell; 21. Second opening; 22. Bending section; 3. Connecting ring; 31. Welding operation surface; 32. Spot welding trajectory; 33. Intersection line; 4. Tooling fixture. Detailed Implementation

[0043] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0044] Example 1

[0045] The present invention includes an outer shell 1 and an inner liner shell 2, such as Figure 1 and 2 As shown, the outer shell 1 is a box-shaped structure. In this embodiment, the outer shell 1 has six side walls, one of which has a first opening 11, thus forming an open box-shaped structure. The inner liner 2 is embedded in the outer shell 1 through the first opening 11. The inner liner 2 is also a box-shaped structure, which facilitates the placement of the battery cell assembly inside. One end of the inner liner 2 has a second opening 21 in the same direction as the first opening 11. A connecting ring 3 is provided between the outer periphery of the inner liner 2 at the second opening 21 and the inner wall of the outer shell 1. In this embodiment, the connecting ring 3 is similar to a sealing ring and has a strip-shaped structure. The connecting ring 3 is sleeved on the outer peripheral wall of the inner liner shell 2, and the connecting ring 3 and the outer peripheral wall of the inner liner shell 2 are fitted together. This facilitates the connection between the connecting ring 3 and the outer peripheral wall of the inner liner shell 2 by welding. After the inner liner shell 2 and the connecting ring 3 are fixed together, the inner liner shell 2 and the connecting ring 3 are embedded together into the outer shell 1. At this time, the connecting ring 3 is also fitted with the inner wall of the outer shell 1. Then, the connecting ring 3 and the inner wall of the outer shell 1 are fixedly connected by welding.

[0046] Furthermore, the outer shell 1 is made of metal, such as aluminum, and the inner liner shell 2 is made of insulating material, such as plastic, such as PP or PET. The connecting ring 3 is also made of metal, such as aluminum, so that the connecting ring 3 and the outer shell 1 can be welded with the same material, while the connecting ring 3 and the inner liner shell 2 are welded with different materials, making welding more convenient and reducing the defect rate. Welding of different materials is usually laser welding, forming offline welding.

[0047] Furthermore, the cross-section of the connecting ring 3 is square. One side of the connecting ring 3 is attached to and welded to the inner liner shell 2, while the opposite side of the connecting ring 3 is attached to and welded to the inner wall of the outer shell 1, thereby maximizing the welding surface area and increasing the welding strength.

[0048] Furthermore, the inner wall of the outer shell 1 can be a flat surface or a stepped surface 19 can be provided. The side and bottom of the connecting ring 3 facing the inner wall of the outer shell 1 are engaged with the stepped surface 19 to limit the connection ring 3. Then, the side of the connecting ring 3 facing the inner wall of the outer shell 1 and the inner wall of the outer shell 1 are welded together.

[0049] The edge of the second opening 21 of the inner liner shell 2 is bent outward to form a bent portion 22. The bent portion 22 is at a right angle to the peripheral wall of the inner liner shell 2. The bottom of the bent portion 22 is exactly engaged with the upper side of the connecting ring 3 in a stepped manner, which makes the welding and fixing between the inner liner shell 2 and the connecting ring 3 more secure, and at the same time increases the firmness of the inner liner shell 2 embedded in the outer shell 1.

[0050] Furthermore, the bent portion 22 can also be formed by the circumferential protrusion of the outer peripheral wall of the inner liner shell 2 near the second opening 21, that is, the bent portion 22 is formed by the circumferential protrusion from the outer peripheral wall of the inner liner shell 2.

[0051] Of course, when the inner wall of the housing is provided with a stepped surface 19, the connecting ring 3 may not be necessary, and the bent part 22 can be directly engaged with the stepped surface 19 and fixedly connected by welding.

[0052] Furthermore, the outer shell 1 includes a first side plate 12, a second side plate 13, a third side plate 14, a fourth side plate 15, and a bottom plate 16. The first side plate 12, the second side plate 13, and the third side plate 14 are formed by bending and connecting the ends of a single plate. The fourth side plate 15 and the bottom plate 16 are fixedly connected by welding. The fourth side plate 15 and the bottom plate 16 are integral plates, i.e., L-shaped plates. The fourth side plate 15 corresponds to the opening of the outer shell 1 as the fourth opening 18. The L-shaped plate is welded to the shell formed by the three side plates, i.e., the fourth side plate 15 is welded to the fourth opening 18, and the bottom plate 16 is welded to the third opening 17. This not only facilitates the installation of the inner liner shell 2, but also makes the outer shell 1 less prone to deformation during processing compared to the integral molding method.

[0053] The inner walls of the first side plate 12, the second side plate 13, the third side plate 14, and the fourth side plate 15 are all provided with grooves 110. After the four side plates are enclosed, the four corresponding grooves 110 are enclosed to form an annular groove 110. In this embodiment, each side plate has at least one groove 110. The multiple grooves 110 on each side plate are distributed parallel to each other along the height direction of the side plate, so that after the four side plates are enclosed, the side wall of the outer shell 1 forms multiple parallel annular grooves 110. After the inner liner 2 is embedded in the outer shell 1, the outer wall of the inner liner 2 is attached to the inner side wall of the outer shell 1. The outer wall of the inner liner 2 covers the opening of the groove 110, so that the outer wall of the inner liner 2 and the groove 110 enclose to form a constant temperature channel 112. A heating source or cooling source, such as heating liquid or cooling liquid, can be poured into the constant temperature channel 112 to achieve cooling, heating or constant temperature of the entire shell. The outer peripheral wall of the outer casing 1 is provided with a connector, which is connected to the constant temperature channel 112. It is very convenient to fill or replace the liquid in the constant temperature channel 112 through the connector.

[0054] This embodiment also includes a manufacturing process for the battery insulating shell structure, which includes the following steps:

[0055] Step 1: Prepare plate 1 and plate 2. Both plate 1 and plate 2 are made from sheet metal. A groove 110 is made on the surface of plate 1. The groove 110 passes through the opposite ends of the plate. When plate 1 is closed, it can form an annular constant temperature channel 112. In this embodiment, the groove 110 is made using conventional technology. For example, a grooving machine can be used to groove plate 1.

[0056] Step 2: Plate 1 is bent to form a C-shaped plate with a right angle, and Plate 2 is bent to form an L-shaped plate. The L-shaped plate and the C-shaped plate are welded together to form an outer shell 1 with a first opening 11. This outer shell 1 is the outer shell 1 in Embodiment 1, that is, the first side plate 12, the second side plate 13, and the third side plate 14 are enclosed to form a C-shaped plate, while the fourth side plate 15 and the bottom plate 16 are L-shaped plates.

[0057] This embodiment requires an intermediate layer. In this case, the intermediate layer is welded to the inner wall of each side plate. The intermediate layer can be made of metal or insulating material.

[0058] In this embodiment, the intermediate layer is welded to the surface of the first plate to cover the groove 110, and then the plate is bent.

[0059] Step 3: Prepare a sheet of material. After bending and welding, the sheet of material is formed into a square tubular part. The open end of the tubular part is longitudinally cut to form a square connecting ring 3 after blanking.

[0060] Step 4: Prepare the inner liner shell 2. In this embodiment, the inner liner shell 2 is made of plastic and is manufactured by injection molding or blow molding. The connecting ring 3 is fitted onto the second opening 21 of the inner liner shell 2. One side of the connecting ring 3 is attached to the outer peripheral wall of the inner liner shell 2, and the other side serves as the welding operation surface 31. During this process, a tooling fixture 4 can be used. In this embodiment, the tooling fixture 4 adopts a block structure. The inner liner shell 2 is upside down fitted onto the tooling fixture 4. The outer wall of the tooling fixture 4 supports and positions the inner liner shell 2. After the side of the connecting ring 3 is attached to the inner liner shell 2, the welding operation surface 31 of the connecting ring 3 is pressed so that the connecting ring 3 can be flatly attached to the outer wall of the inner liner shell 2, and the second opening 21 of the connecting ring 3 and the inner liner shell 2 can be aligned against the tooling fixture 4 to limit the position of the connecting ring 3 and the inner liner shell 2 and prevent the connecting ring 3 and the inner liner shell 2 from shifting during the welding process.

[0061] Step 5: Perform penetrating and dense spot welding on the welding operation surface 31 to fix the connecting ring 3 to the inner liner shell 2. The spot welding trajectory 32 is distributed along the circumference of the connecting ring 3 and the spot welding trajectory 32 is located in the middle of the welding operation surface 31.

[0062] Step 6: Insert the inner sleeve 2 with the connecting ring 3 welded on into the outer shell 1, so that the welding operation surface 31 of the connecting ring 3 is attached to the inner wall of the outer shell 1.

[0063] Step 7: After the welding operation surface 31 is attached to the inner wall of the outer shell 1, a ring-shaped intersection line is formed between the top of the welding operation surface 31 and the inner wall of the outer shell 1 along the circumference of the connecting ring 3. Dense spot welding is performed along the intersection line 33 to fix the connection between the connecting ring 3 and the outer shell 1. In this embodiment, dense continuous laser spot welding is used for spot welding.

[0064] Example 2

[0065] The basic structure is the same as that of the first embodiment, except that the first side plate 12, the second side plate 13, the third side plate 14 and the fourth side plate 15 are formed by bending and connecting the ends of a plate to form a shell with openings at both ends. The connection between the ends of the shell forms a seam line 111. The seam line 111 is located on one of the side plates and is connected by welding. The side plate is the one with the narrower width. The openings at both ends of the side plate form a first opening 11 and a third opening 17, respectively. The bottom plate 16 is welded to the third opening 17.

[0066] This embodiment also includes a manufacturing process for the battery insulating shell structure, which includes the following steps:

[0067] Step 1: Prepare plate 1 and plate 2. Both plate 1 and plate 2 are made from sheet metal. A groove 110 is made on the surface of plate 1. The groove 110 passes through the opposite ends of the plate. When plate 1 is closed, it can form an annular constant temperature channel 112. In this embodiment, the groove 110 is made using conventional technology. For example, a grooving machine can be used to groove plate 1.

[0068] Step 2: Plate 1 is bent to form a C-shaped plate with a right angle. Then, the two open ends of the C-shaped plate are bent at right angles and joined together to form a seam line 111. The seam line 111 is fixedly connected by welding. Plate 2 is welded to its bottom as a base plate 16, thereby forming an outer shell 1 with a first opening 11. This outer shell 1 is the outer shell 1 in Embodiment 2.

[0069] The intermediate layer in this embodiment can be set or not. When it is set, the steps of one embodiment can be referred to.

[0070] Step 3: Prepare a sheet of material. After bending and welding, the sheet of material is formed into a square tubular part. The open end of the tubular part is longitudinally cut to form a square connecting ring 3 after blanking.

[0071] Step 4: Prepare the inner liner shell 2. In this embodiment, the inner liner shell 2 is made of plastic and is manufactured by injection molding or blow molding. The connecting ring 3 is fitted onto the second opening 21 of the inner liner shell 2. One side of the connecting ring 3 is attached to the outer peripheral wall of the inner liner shell 2, and the other side serves as the welding operation surface 31. During this process, a tooling fixture 4 can be used. In this embodiment, the tooling fixture 4 adopts a block structure. The inner liner shell 2 is upside down fitted onto the tooling fixture 4. The outer wall of the tooling fixture 4 supports and positions the inner liner shell 2. After the side of the connecting ring 3 is attached to the inner liner shell 2, the welding operation surface 31 of the connecting ring 3 is pressed so that the connecting ring 3 can be flatly attached to the outer wall of the inner liner shell 2, and the second opening 21 of the connecting ring 3 and the inner liner shell 2 can be aligned against the tooling fixture 4 to limit the position of the connecting ring 3 and the inner liner shell 2 and prevent the connecting ring 3 and the inner liner shell 2 from shifting during the welding process.

[0072] Step 5: Perform penetrating and dense spot welding on the welding operation surface 31 to fix the connecting ring 3 to the inner liner shell 2. The spot welding trajectory 32 is distributed along the circumference of the connecting ring 3 and the spot welding trajectory 32 is located in the middle of the welding operation surface 31.

[0073] Step 6: Insert the inner sleeve 2 with the connecting ring 3 welded on into the outer shell 1, so that the welding operation surface 31 of the connecting ring 3 is attached to the inner wall of the outer shell 1.

[0074] Step 7: After the welding operation surface 31 is attached to the inner wall of the outer shell 1, a ring-shaped intersection line is formed between the top of the welding operation surface 31 and the inner wall of the outer shell 1 along the circumference of the connecting ring 3. Dense spot welding is performed along the intersection line 33 to fix the connection between the connecting ring 3 and the outer shell 1. In this embodiment, dense continuous laser spot welding is used for spot welding.

[0075] Example 3

[0076] The basic structure is the same as that of the first embodiment, except that the outer shell 1 is formed by the first side plate 12, the second side plate 13, the third side plate 14, the fourth side plate 15 and the bottom plate 16 to form a box structure with an opening. The opening at the top is the first opening 11. That is, the first side plate 12, the second side plate 13, the third side plate 14, the fourth side plate 15 and the bottom plate 16 are integral. The first side plate 12, the second side plate 13, the third side plate 14, the fourth side plate 15 and the bottom plate 16 are formed by forming a single plate, such as by stamping.

[0077] The present invention also includes a manufacturing process for a battery insulating shell structure, comprising the following steps:

[0078] Step 1: Prepare board body 1 and board body 2. Both board body 1 and board body 2 are made by cutting boards.

[0079] Step 2: The plate is directly stretched to form an outer shell 1 with a first opening 11 at the top. That is, the outer shell 1 is directly stretched and formed by the plate. The outer shell 1 is the outer shell 1 in Embodiment 3.

[0080] Step 3: Prepare a sheet of material. After bending and welding, the sheet of material is formed into a square tubular part. The open end of the tubular part is longitudinally cut to form a square connecting ring 3 after blanking.

[0081] Step 4: Prepare the inner liner shell 2. In this embodiment, the inner liner shell 2 is made of plastic and is manufactured by injection molding or blow molding. The connecting ring 3 is fitted onto the second opening 21 of the inner liner shell 2. One side of the connecting ring 3 is attached to the outer peripheral wall of the inner liner shell 2, and the other side serves as the welding operation surface 31. During this process, a tooling fixture 4 can be used. In this embodiment, the tooling fixture 4 adopts a block structure. The inner liner shell 2 is upside down fitted onto the tooling fixture 4. The outer wall of the tooling fixture 4 supports and positions the inner liner shell 2. After the side of the connecting ring 3 is attached to the inner liner shell 2, the welding operation surface 31 of the connecting ring 3 is pressed so that the connecting ring 3 can be flatly attached to the outer wall of the inner liner shell 2, and the second opening 21 of the connecting ring 3 and the inner liner shell 2 can be aligned against the tooling fixture 4 to limit the position of the connecting ring 3 and the inner liner shell 2 and prevent the connecting ring 3 and the inner liner shell 2 from shifting during the welding process.

[0082] Step 5: Perform penetrating and dense spot welding on the welding operation surface 31 to fix the connecting ring 3 to the inner liner shell 2. The spot welding trajectory 32 is distributed along the circumference of the connecting ring 3 and the spot welding trajectory 32 is located in the middle of the welding operation surface 31.

[0083] Step 6: Insert the inner sleeve 2 with the connecting ring 3 welded on into the outer shell 1, so that the welding operation surface 31 of the connecting ring 3 is attached to the inner wall of the outer shell 1.

[0084] Step 7: After the welding operation surface 31 is attached to the inner wall of the outer shell 1, a ring-shaped intersection line is formed between the top of the welding operation surface 31 and the inner wall of the outer shell 1 along the circumference of the connecting ring 3. Dense spot welding is performed along the intersection line 33 to fix the connection between the connecting ring 3 and the outer shell 1. In this embodiment, dense continuous laser spot welding is used for spot welding.

[0085] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A battery insulating casing structure, characterized in that, The device includes an outer shell (1) and an inner liner shell (2). The outer shell (1) has a first opening (11) on one side. The inner liner shell (2) is made of insulating material and is embedded in the outer shell (1) through the first opening (11). One end of the inner liner shell (2) has a second opening (21) in the same direction as the first opening (11). A connecting ring (3) is provided between the outer periphery of the inner liner shell (2) at the second opening (21) and the inner wall of the outer shell (1). The connecting ring (3) is fixedly connected to the outer periphery of the inner liner shell (2) by welding, and the connecting ring (3) is fixedly connected to the inner wall of the outer shell (1) by welding. Connection; the outer shell (1) is formed by the first side plate (12), the second side plate (13), the third side plate (14), the fourth side plate (15) and the bottom plate (16) to form a box structure with an opening, the opening being the first opening (11); the inner walls of the first side plate (12), the second side plate (13), the third side plate (14) and the fourth side plate (15) are all provided with grooves (110), the outer shell (1) and the inner liner shell (2) are provided with an intermediate layer, the intermediate layer is connected to the inner walls of the four side plates and is surrounded by the grooves (110) to form a constant temperature channel (112), the constant temperature channel (112) is filled with a heating source or a cooling source.

2. The battery insulating shell structure according to claim 1, characterized in that, The first side plate (12), the second side plate (13), and the third side plate (14) are formed by bending a single plate from end to end; The fourth side plate (15) and the bottom plate (16) are fixedly connected by welding, or the fourth side plate (15) and the bottom plate (16) are integrally formed.

3. The battery insulating housing structure according to claim 2, characterized in that, The first side plate (12), the second side plate (13), the third side plate (14) and the fourth side plate (15) are formed by bending and connecting the ends of a plate to form a box structure with openings at both ends. The seam line (111) at the beginning and end is located on one of the side plates with a narrow width and is connected by welding. The outer shell (1) forms a first opening (11) and a third opening (17) at its two openings respectively. The bottom plate (16) is welded to the third opening (17).

4. The battery insulating shell structure according to claim 1, characterized in that, The cross-section of the connecting ring (3) is square. One side of the connecting ring (3) is attached to and welded to the inner liner shell (2), and the other side of the connecting ring (3) is attached to and welded to the inner side wall of the outer shell (1). The inner wall of the outer shell (1) is provided with a stepped surface (19), and the connecting ring (3) is engaged with the side and bottom of the inner wall of the outer shell (1) on the stepped surface (19); the second opening (21) of the inner liner (2) is bent outward to form a bent part (22), or the outer peripheral wall of the inner liner (2) near the second opening (21) protrudes circumferentially to form a bent part (22), and the connecting ring (3) is engaged with the side and top of the outer peripheral wall of the inner liner (2) on the bent part (22).

5. The battery insulating housing structure according to claim 3, characterized in that, The inner liner (2) is made of insulating material, and the connecting ring (3) is made of the same material as the outer shell (1) and is metal.

6. A manufacturing process for a battery insulating shell structure as described in any one of claims 1 to 5, characterized in that, It has the following steps: Step 1: Prepare the plate body and make a groove (110) on the inner wall surface of the plate body. The groove (110) extends to the opposite ends of the plate body. Step 2: The plate is bent and welded to form the outer shell (1); Step 3: Prepare the sheet material. After bending and welding, the sheet material is formed into a tubular part. The open end of the tubular part is longitudinally cut to form a connecting ring (3). Step 4: Prepare the inner liner shell (2), and put the connecting ring (3) onto the second opening (21) of the inner liner shell (2). One side of the connecting ring (3) is attached to the outer peripheral wall of the inner liner shell (2), and the other side is used as the welding operation surface (31). Step 5: Perform dense continuous spot welding on the welding operation surface (31) to fix the connecting ring (3) to the inner liner shell (2), wherein the spot welding trajectory (32) is along the circumference of the connecting ring (3) and located in the middle of the welding operation surface (31); Step 6: Insert the inner liner (2) with the connecting ring (3) welded on into the outer shell (1), so that the welding operation surface (31) of the connecting ring (3) fits against the inner wall of the outer shell (1); Step 7: Perform dense, continuous spot welding along the intersection line between the top of the welding operation surface (31) and the inner wall of the outer shell (1).

7. The manufacturing process according to claim 6, characterized in that, In step two, the plate body includes plate body one and plate body two. Plate 1 is bent into a C-shaped plate with a right angle, and plate 2 is bent into an L-shaped plate. The L-shaped plate and the C-shaped plate are welded together to form an outer shell (1) with a first opening (11); or The first plate is bent to form a C-shaped plate with a right angle. Then, the two open ends of the C-shaped plate are bent at right angles and joined together, forming a seam line (111) at the joint. The seam line (111) is fixedly connected by welding. The second plate is welded to its bottom as a base plate (16), thereby forming an outer shell (1) with a first opening (11).

8. A manufacturing process for a battery insulating shell structure as described in any one of claims 1 to 5, characterized in that, It has the following steps: Step 1: Prepare the plate body. The plate body is formed into an outer shell (1) with one end having the first opening (11) through a molding process. Step 2: Prepare the sheet material. After bending and welding, the sheet material is formed into a tubular part. The open end of the tubular part is longitudinally cut to form a connecting ring (3). Step 3: Prepare the inner liner shell (2), and put the connecting ring (3) onto the second opening (21) of the inner liner shell (2). One side of the connecting ring (3) is attached to the outer peripheral wall of the inner liner shell (2), and the other side is used as the welding operation surface (31). Step 4: Perform dense connection spot welding on the welding operation surface (31) to fix the connecting ring (3) to the inner liner shell (2), wherein the spot welding trajectory (32) is along the circumference of the connecting ring (3) and located in the middle position of the welding operation surface (31). Step 5: Insert the inner liner (2) with the connecting ring (3) welded on into the outer shell (1), so that the welding operation surface (31) of the connecting ring (3) is attached to the inner wall of the outer shell (1); Step 6: Perform dense, continuous spot welding along the intersection line between the top of the welding operation surface (31) and the inner wall of the outer shell (1).

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