Housing, electrochemical device and method of manufacture

Abstract

This invention provides a housing, an electrochemical device, and a preparation method. The housing includes an outer shell and an electrode assembly. The outer shell has a receiving cavity with an installation opening, and a positioning step is formed by a recess around the installation opening on the outer side wall of the outer shell. The electrode assembly includes a support ring, an electrode member, and an insulating ring. The support ring is positioned and installed on the outer side wall of the outer shell via the positioning step. The electrode member is insulated and installed on the support ring via the insulating ring, and the electrode member extends into the receiving cavity through the insulating ring, the support ring, and the installation opening. This invention saves production costs and improves production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of electrochemical device technology, and in particular relates to a shell, an electrochemical device, and a preparation method thereof. Background Technology

[0002] Polymer lithium-ion batteries are widely used in consumer electronics, new energy vehicles, and energy storage systems due to their high energy density. The battery casing requires terminals to connect the cells to external circuitry. In existing technologies, the positioning accuracy between the casing and terminals is not high, affecting battery production efficiency. Furthermore, to prevent electrical connection between the casing and terminals, an insulating connection is required, such as through adhesive bonding. Therefore, improving the bonding performance of the casing necessitates surface treatment of the entire casing, increasing production costs. Additionally, the casing surface is easily scratched during subsequent assembly, affecting yield and ultimately impacting battery production efficiency. Moreover, bonding the casing and terminals with adhesive requires heating the entire casing to a high temperature, resulting in prolonged heating time and high energy consumption, further increasing production costs and impacting efficiency. Summary of the Invention

[0003] This invention addresses the technical problems of high production cost and low production efficiency in the preparation of shells in existing technologies by providing a shell, an electrochemical device, and a preparation method.

[0004] In view of the above technical problems, embodiments of the present invention provide a housing, an electrochemical device, and a preparation method. The housing includes an outer shell and an electrode assembly. The outer shell is provided with a receiving cavity having an installation opening, and a positioning step is formed by recessing the outer side wall of the outer shell around the installation opening. The pole assembly includes a support ring, a pole piece, and an insulating ring. The support ring is positioned and installed on the outer side wall of the housing via the positioning step. The pole piece is insulated and installed on the support ring via the insulating ring, and the pole piece extends into the receiving cavity through the insulating ring, the support ring, and the mounting port.

[0005] In this embodiment, by setting a support ring between the pole piece and the outer shell, the pole piece can be first insulated and mounted on the support ring to form a pole piece assembly. Then, the support ring is mounted on the outer wall of the outer shell to complete the connection between the pole piece assembly and the outer shell. In this process, the pole piece is already insulated from the support ring by the insulation ring. The connection between the support ring and the outer shell does not require insulation consideration and can be achieved by welding or other methods. Therefore, there is no need to perform surface treatment and heating on the outer shell to increase the stability of its connection with the pole piece. Only the support ring, which is directly connected to the pole piece, needs to be surface treated and heated to increase its connection stability, thus saving production costs and improving production efficiency. Furthermore, by setting a positioning step around the mounting opening on the outer wall of the outer shell, the support ring can be quickly positioned with the mounting opening through the positioning step, completing the connection between the support ring and the outer shell, further improving production efficiency.

[0006] An electrochemical device, including the housing.

[0007] A method for preparing the shell, comprising: The outer casing is stamped to form a positioning step at the edge of the mounting opening; A plurality of support rings spaced apart on the support strip are subjected to a half-cut stamping process to form a half-cut step around each of the support rings; The pole pieces are insulated and installed one-to-one on each of the support rings of the support strip to form multiple pole assemblies on the support strip. Positioning is achieved by using the positioning steps to position and install the support ring of the pole assembly on the outer side wall of the housing, and the pole assembly is controlled to separate from the support strip to confirm that the housing assembly is complete.

[0008] In this embodiment, by stamping the outer shell to form a positioning step at the edge of the mounting opening, the support ring can be quickly positioned with the mounting opening via the positioning step, completing the connection between the support ring and the outer shell, thus improving production efficiency. By performing a half-cut stamping process on multiple support rings spaced apart on the support strip, half-cut steps are formed around each support ring, reducing the connection force between the support ring and the support strip, making the connection force between the support ring and the support strip less than the connection force between the support ring and the outer shell. Afterwards, after the support ring is positioned and installed on the outer wall of the outer shell via the positioning step, it can be directly separated from the support strip by pulling. The above method uses a strip-type feeding system, resulting in faster installation speed and improved production yield and efficiency. Furthermore, by setting a support ring between the pole piece and the outer shell, the pole piece can be first insulated and mounted on the support ring to form a pole piece assembly. Then, the support ring is mounted on the outer wall of the outer shell to complete the connection between the pole piece assembly and the outer shell. In the above process, the pole piece has already achieved insulation from the support ring through the insulation ring. The support ring and the outer shell can be connected by welding or other methods. Therefore, there is no need to consider the insulation between the outer shell and the pole piece. Instead of surface treating and heating the outer shell, which has a larger surface area, to increase the stability of its connection with the pole piece, it is only necessary to surface treat and heat the support ring, which has a smaller surface area and is directly connected to the pole piece, to increase the stability of its insulating connection with the pole piece. This saves production costs and improves production efficiency. Attached Figure Description

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0010] Figure 1 This is a schematic diagram of the structure of the housing provided in the first embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram of the structure of the pole assembly of the housing provided in an embodiment of the present invention.

[0012] Figure 3 This is a schematic diagram of the structure of the support strip provided in an embodiment of the present invention.

[0013] Figure 4 This is a schematic diagram of the structure of the support strip provided in another embodiment of the present invention.

[0014] Figure 5 This is a schematic diagram of the shell structure provided in the second embodiment of the present invention.

[0015] Figure 6 This is a schematic diagram of the shell structure provided in the third embodiment of the present invention.

[0016] Figure 7This is a schematic diagram of the shell structure provided in the fourth embodiment of the present invention.

[0017] Figure 8 This is a schematic diagram of the shell structure provided in the fifth embodiment of the present invention.

[0018] Figure 9 This is a schematic diagram of the shell structure provided in the sixth embodiment of the present invention.

[0019] Figure 10 This is a schematic diagram of the electrochemical device provided in the first embodiment of the present invention.

[0020] Figure 11 This is a schematic diagram of the electrochemical device provided in the second embodiment of the present invention.

[0021] Figure 12 This is a flowchart of a preparation method provided in an embodiment of the present invention.

[0022] The reference numerals in the accompanying drawings are as follows: 110. Outer shell; 111. Mounting port; 112. Receiving cavity; 113. Positioning step; 1131. First guide surface; 120. Terminal assembly; 121. Support ring body; 1211. Electroplating layer; 1212. First passivation layer; 1213. Second guide surface; 122. Terminal piece; 1221. Top electrode plate; 1222. Column body; 1223. Bottom electrode plate; 1224. Second passivation layer; 123. Insulating ring body; 1231. Upper plate body; 12311. First plate body; 12312. Second plate body; 12313. Limiting rib; 1232. Lower plate body; 12321. Third plate body; 12322. Fourth plate body; 124. Washer; 130. Welded body; 200. Support strip; 300. Battery cell; 400. Shell cover. Detailed Implementation

[0023] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0024] It should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the present invention.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] like Figures 1 to 9 As shown, an embodiment of the present invention provides a housing, including an outer shell 110 and a pole assembly 120; the outer shell 110 is provided with a receiving cavity 112 having a mounting opening 111, and a positioning step 113 is recessed around the mounting opening 111 on the outer side wall of the outer shell 110; the pole assembly 120 includes a support ring 121, a pole member 122, and an insulating ring 123. The support ring 121 is positioned and installed on the outer side wall of the outer shell 110 through the positioning step 113, and the pole member 122 is insulated and installed on the support ring 121 through the insulating ring 123, and the pole member 122 extends into the receiving cavity 112 through the insulating ring 123, the support ring 121, and the mounting opening 111.

[0027] Understandably, the accommodating cavity 112 is used to accommodate components such as the battery cell 300. The bottom of the terminal 122 is located inside the accommodating cavity 112 and is used for electrical connection with the battery cell 300 housed in the accommodating cavity 112. The top of the terminal 122 is located outside the accommodating cavity 112 to enable electrical connection with external components to output electrical energy; the bottom end of the terminal 122 extends into the accommodating cavity 112 through the insulating ring 123, the support ring 121, and the mounting port 111, and is used for electrical connection with components such as the battery cell 300 inside the accommodating cavity 112.

[0028] The positioning step 113 can be formed by stamping at the edge of the mounting opening 111 on the outer shell 110. Alternatively, the positioning step 113 can be formed together with the outer shell 110 at the edge of the mounting opening 111 by casting or forging. The depth of the positioning step 113 is less than half the thickness of the outer shell 110, thereby ensuring the structural strength of the outer shell 110 while achieving positioning.

[0029] The insulating ring 123 is connected to the side of the support ring 121 opposite to the receiving cavity 112. The pole piece 122 is insulatedly connected to the support ring 121 through the insulating ring 123, thereby avoiding short circuits caused by electrical connection between the support ring 121 and the outer casing 110.

[0030] The thickness of the insulating ring 123 can be set according to the actual situation, as long as it ensures that the pole piece 122 is stably installed on the support ring 121 through the insulating ring 123, and ensures the insulation between the pole piece 122 and the support ring 121.

[0031] In one embodiment, the thickness of the insulating ring 123 is 0.08~0.18mm.

[0032] The connection method between the insulating ring 123 and the supporting ring 121, and between the insulating ring 123 and the pole piece 122, can be set according to the actual situation, as long as the connection stability and insulation of the supporting ring 121 and the pole piece 122 are ensured.

[0033] like Figure 2 As shown, in one embodiment, the insulating ring 123 is an insulating rubber ring bonded between the support ring 121 and the pole piece 122. In this embodiment, the insulating ring 123 is bonded to the support ring 121, and the insulating ring 123 is bonded to the pole piece 122. The insulating ring 123 can be made of polypropylene, polyethylene, or composite insulating adhesive.

[0034] The support ring 121 and the positioning step 113 are matched in shape. There may be a gap between the support ring 121 and the positioning step 113 to facilitate the positioning of the support ring 121 and the positioning step 113. In one embodiment, the gap is less than 0.10 mm.

[0035] The support ring 121 can be made of metal, such as stainless steel alloy, aluminum alloy, or nickel alloy. In one embodiment, the thickness of the support ring 121 is less than or equal to 0.20 mm (e.g., 0.05 mm, 0.075 mm, 0.10 mm, 0.15 mm, or 0.2 mm, etc.), thereby facilitating welding to the outer shell 110.

[0036] The material of the support ring 121 can be set according to the actual situation, as long as the connection stability between the support ring 121 and the insulating ring 123, and between the support ring 121 and the outer shell 110 is ensured simultaneously. In one embodiment, the material of the support ring 121 is stainless steel alloy, aluminum alloy, or nickel alloy.

[0037] The connection between the support ring 121 and the outer shell 110 includes, but is not limited to, one or more methods such as welding or bonding. In one embodiment, the support ring 121 is welded to the outer side wall of the outer shell 110. Specifically, after the support ring 121 is positioned on the outer side wall of the outer shell 110 by the positioning step 113, welding is performed on the upper surface of the support ring 121, and the welding penetrates the support ring 121 until it reaches approximately the middle of the thickness of the outer shell 110. Through the above welding, a connection can be formed between the support ring 121 and the outer shell 110. Figure 1 The welded body 130 shown.

[0038] The welded bodies 130 are arranged in a ring along the mounting opening 111. The cross-section of the welded bodies 130 in the vertical direction is conical. The outer diameter of the positioning step 113 is larger than the outer diameter of the welded bodies 130. In one embodiment, the difference between the outer diameter of the positioning step 113 and the outer diameter of the welded bodies 130 is greater than or equal to 0.3 mm and less than or equal to 1.6 mm.

[0039] The outer diameter of the welded body 130 is larger than the outer diameter of the insulating ring 123. In one embodiment, the difference between the outer diameter of the welded body 130 and the outer diameter of the insulating ring 123 is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0040] like Figure 3 As shown, in one embodiment, there can be multiple support rings 121, and the multiple support rings 121 are spaced apart on the support strip 200.

[0041] Understandably, the plurality of support rings 121 are spaced apart on the support strip 200, which can be as follows: Figure 5 and Figure 6 As shown, the pole piece 122 is insulated and installed one-to-one with the supporting ring 123 on each of the supporting rings 121 of the supporting strip 200, so as to form multiple pole pieces 120 on the supporting strip 200, thereby improving the production efficiency of the product.

[0042] Before the support ring 121 is positioned and installed on the outer side wall of the outer casing 110 via the positioning step 113, it can be as follows: Figure 4As shown, firstly, a plurality of support rings 121 spaced apart on the support strip 200 are subjected to a half-cut stamping process to form a half-cut step around each support ring 121. This reduces the connection force between the support ring 121 and the support strip 200, making the connection force between the support ring 121 and the support strip 200 less than the connection force between the support ring 121 and the outer shell 110. Afterwards, once the support ring 121 is positioned and installed on the outer wall of the outer shell 110 via the positioning step 113, it can be directly separated from the support strip 200 by pulling. This method uses a strip-type feeding system, which is fast and avoids scratches on the surface of the pole piece 122, improving product yield and production efficiency.

[0043] In this embodiment, by providing a support ring 121 between the pole piece 122 and the outer shell 110, the pole piece 122 can be first insulated and mounted on the support ring 121 through the insulating ring 123 to form the pole piece assembly 120. Then, the support ring 121 is mounted on the outer side wall of the outer shell 110 to complete the connection between the pole piece assembly 120 and the outer shell 110. In the above process, the pole piece 122 has been insulated from the support ring 121 through the insulating ring 123. The connection between the support ring 121 and the outer shell 110 does not need to consider insulation and can be connected by welding or other methods. Therefore, there is no need to perform surface treatment and heating on the outer shell 110 to increase its connection stability with the pole piece 122. Only the support ring 121 directly connected to the pole piece 122 needs to be surface treated and heated to increase its connection stability with the pole piece 122, which saves production costs and improves production efficiency. In addition, by setting a positioning step 113 around the mounting opening 111 on the outer side wall of the outer shell 110, the support ring 121 can be quickly positioned with the mounting opening 111 through the positioning step 113, and the connection between the support ring 121 and the outer shell 110 can be completed, thereby improving production efficiency.

[0044] like Figure 2 As shown, in one embodiment, the support ring 121 is sequentially covered with an electroplated layer 1211 and a first passivation layer 1212. Understandably, the electroplated layer 1211 is used to improve the surface smoothness of the support ring 121. The thickness of the electroplated layer 1211 can be set according to actual conditions. In one embodiment, the thickness of the electroplated layer 1211 is 0.2~2μm.

[0045] The first passivation layer 1212 can be formed after passivating the support ring 121. The first passivation layer 1212 can increase the affinity between the support ring 121 and the insulating ring 123, increasing adhesion and thus strengthening the sealing performance of the housing. The thickness of the first passivation layer 1212 can be set according to actual conditions. In one embodiment, the thickness of the first passivation layer 1212 is 5~50 nm.

[0046] The material of the electrode post 122 can be set according to actual conditions, as long as the electrode post 122 can conduct electricity. In one embodiment, the material of the electrode post 122 is aluminum.

[0047] In one embodiment, the electrode post 122 is covered with a second passivation layer 1224. Understandably, the second passivation layer 1224 can be formed after passivating the electrode post 122. The second passivation layer 1224 can increase the affinity between the electrode post 122 and the insulating ring 123, increasing adhesion and thus strengthening the sealing performance of the housing. The thickness of the second passivation layer 1224 can be set according to actual conditions. In one embodiment, the thickness of the second passivation layer 1224 is 5~50 nm.

[0048] like Figure 7 and Figure 8 As shown, in one embodiment, the positioning step 113 is provided with a first guide surface 1131, and the support ring 121 is provided with a second guide surface 1213 opposite to the first guide surface 1131. It can be understood that the first guide surface 1131 and the second guide surface 1213 can be as follows: Figure 7 The inclined plane shown or as Figure 8 The arc surface shown has a first guide surface 1131 that cooperates with the second guide surface 1213 to guide the support ring 121 to fall smoothly into the positioning step 113, reducing the risk of assembly jamming and improving assembly efficiency.

[0049] like Figure 9As shown, in one embodiment, the insulating ring 123 includes an upper sheet 1231 and a lower sheet 1232; the pole piece 122 includes a top pole plate 1221, a pole piece 1222, and a bottom pole plate 1223. The bottom pole plate 1223 is located within the receiving cavity 112. One end of the pole piece 1222 is connected to the top pole plate 1221, and the other end of the pole piece 1222 passes through the insulating ring 123, the supporting ring 121, and the mounting port 111 to connect to the bottom pole plate. 1223; The lower sheet 1232 is insulated against the bottom electrode 1223 and the support ring 121. The upper sheet 1231 includes a first sheet 12311 insulated against the top electrode 1221 and the support ring 121, and a second sheet 12312 insulated between the column 1222 and the support ring 121. The second sheet 12312 extends from the bottom end of the first sheet 12311 toward the lower sheet 1232.

[0050] Understandably, the top electrode plate 1221 is located outside the receiving cavity 112, and the bottom electrode plate 1223 is located inside the receiving cavity 112. The connection method of the bottom electrode plate 1223, the column 1222, and the top electrode plate 1221 can be one or more of the following: integral molding, bonding, or welding. In one embodiment, the connection method of the bottom electrode plate 1223, the column 1222, and the top electrode plate 1221 is integral molding. The second piece 12312 is located between the outer shell 110 and the column 1222 to insulate and isolate the outer shell 110 and the column 1222, preventing the column 1222 from contacting the outer shell 110 and causing a short circuit in the event of displacement due to external forces, thereby further improving safety.

[0051] During the installation of the electrode post 122, the electrode post 122 can first be passed through the lower plate 1232, the mounting port 111, and the upper plate 1231 from bottom to top, and then the top electrode plate 1221 can be stamped out at the top of the post 1222 by stamping. Alternatively, the electrode post 122 can first be passed through the upper plate 1231, the mounting port 111, and the lower plate 1232 from top to bottom, and then the bottom electrode plate 1223 can be stamped out at the bottom of the post 1222 by stamping.

[0052] The second piece 12312 cooperates with the lower piece 1232 to not only insulate the outer shell 110 and the electrode post 122, but also to insulate the electrode post 122 and the support ring 121. At the same time, it forms a multi-layer sealing structure for the mounting port 111, eliminating assembly gaps and further improving the sealing performance at the mounting port 111 to prevent electrolyte leakage.

[0053] like Figure 9 As shown, in one embodiment, the upper plate 1231 further includes a limiting rib 12313 extending upward from the top of the first plate 12311. The limiting rib 12313 is arranged around the top electrode plate 1221 to limit the top electrode plate 1221.

[0054] Understandably, a mounting groove for mounting the top electrode plate 1221 is formed between the first piece 12311 and the limiting rib 12313. The limiting rib 12313 is used to limit the top electrode plate 1221 in the mounting groove to prevent the top electrode plate 1221 from shifting during installation or use.

[0055] like Figure 9 As shown, in one embodiment, the pole assembly 120 further includes a washer 124; the bottom end of the washer 124 abuts against the bottom pole plate 1223, and the top end of the washer 124 abuts against the bottom end of the lower plate 1232 and the second plate 12312.

[0056] like Figure 9 As shown, in one embodiment, the lower sheet 1232 includes a third sheet 12321 that insulates against the washer 124 and the support ring 121, and a fourth sheet 12322 that extends downward from the bottom surface of the third sheet 12321, the inner sidewall of the fourth sheet 12322 abutting against the outer sidewall of the washer 124.

[0057] Understandably, the fourth piece 12322 is used to further strengthen the insulation protection between the support ring 121 and the pole piece 122, enhance the insulation effect, and prevent the support ring 121 and the pole piece 122 from short-circuiting.

[0058] like Figure 10 and Figure 11 As shown, one embodiment of the present invention also provides an electrochemical device, including the housing.

[0059] In the electrochemical device of the above embodiments of the present invention, by providing a support ring 121 between the electrode post 122 and the outer shell 110, the electrode post 122 can be first insulated and mounted on the support ring 121 through an insulating ring 123 to form an electrode post assembly 120. Then, the support ring 121 is mounted on the outer side wall of the outer shell 110 to complete the connection between the electrode post assembly 120 and the outer shell 110. In this process, there is no need to perform surface treatment on the outer shell 110 to increase the connection stability with the electrode post 122; only the support ring 121, which is directly connected to the electrode post 122, needs surface treatment to increase its connection stability. This saves production costs and improves production efficiency. Furthermore, by providing a positioning step 113 around the mounting opening 111 on the outer side wall of the outer shell 110, the support ring 121 can be quickly positioned with the mounting opening 111 through the positioning step 113, completing the connection between the support ring 121 and the outer shell 110, further improving production efficiency.

[0060] In one embodiment, the electrochemical device further includes a battery cell 300 located within the accommodating cavity 112. The battery cell 300 is electrically connected to the bottom of the electrode post 122 to output electrical energy to external components.

[0061] In one embodiment, the electrochemical device further includes a cover 400 corresponding to the housing 110.

[0062] like Figure 12 As shown, an embodiment of the present invention also provides a method for preparing the shell, including steps S100-S400: S100, the housing 110 is stamped to form a positioning step 113 at the edge of the mounting opening 111.

[0063] The shape of the positioning step 113 corresponds to that of the support ring 121. The depth of the positioning step 113 is less than half the thickness of the outer shell 110, thereby ensuring the structural strength of the outer shell 110 while achieving positioning.

[0064] S200: Perform a half-cut stamping process on a plurality of support rings 121 spaced apart on the support strip 200 to form a half-cut step around each of the support rings 121.

[0065] The semi-cut step is used to reduce the connection force between the support ring 121 and the support strip 200, making the connection force between the support ring 121 and the support strip 200 less than the connection force between the support ring 121 and the outer shell 110. This facilitates the direct separation of the support ring 121 from the support strip 200 by pulling after the support ring 121 has been positioned and installed on the outer wall of the outer shell 110 via the positioning step 113.

[0066] S300, the pole piece 122 is insulatedly installed on each of the support rings 121 of the support strip 200 through the insulating rings 123, so as to form a plurality of pole pieces 120 on the support strip 200.

[0067] Understandably, multiple support rings 121 are spaced apart on the support strip 200, allowing the pole pieces 122 to be insulated and installed one-to-one on each support ring 121 of the support strip 200 via insulating rings 123, thereby forming multiple pole pieces assemblies 120 on the support strip 200. This method uses strip feeding, which is fast and avoids scratches on the surface of the pole pieces 122, improving product yield and production efficiency.

[0068] S400. Position the support ring 121 of the pole post assembly 120 on the outer side wall of the outer shell 110 by positioning it through the positioning step 113, and control the pole post assembly 120 to separate from the support strip 200 to confirm that the shell assembly is complete.

[0069] Understandably, the connection force between the support ring 121 and the support strip 200 is less than the connection force between the support ring 121 and the outer shell 110. After the support ring 121 of the pole post assembly 120 is positioned and installed on the outer side wall of the outer shell 110, the pole post assembly 120 can be controlled to separate from the support strip 200, thereby completing the assembly of the shell.

[0070] In the manufacturing method for the housing described in the above embodiments of the present invention, the outer shell 110 is stamped to form a positioning step 113 at the edge of the mounting opening 111. This allows the support ring 121 to be quickly positioned with the mounting opening 111 via the positioning step 113, thus completing the connection between the support ring 121 and the outer shell 110, thereby improving production efficiency. By performing a half-cut stamping process on multiple support rings 121 spaced apart on the support strip 200, half-cut steps are formed around each support ring 121, reducing the connection force between the support ring 121 and the support strip 200, making the connection force between the support ring 121 and the support strip 200 less than the connection force between the support ring 121 and the outer shell 110. Afterwards, once the support ring 121 is positioned and installed on the outer wall of the outer shell 110 via the positioning step 113, it can be directly separated from the support strip 200 by pulling. The above method uses a conveyor belt feeding system, which speeds up installation and improves production yield and efficiency. Furthermore, by providing a support ring 121 between the pole piece 122 and the outer shell 110, the pole piece 122 can be first insulated and mounted on the support ring 121 through the insulating ring 123 to form the pole piece assembly 120. Then, the support ring 121 is mounted on the outer side wall of the outer shell 110 to complete the connection between the pole piece assembly 120 and the outer shell 110. In the above process, the pole piece 122 has already achieved insulation with the support ring 121 through the insulating ring 123. The support ring 121 and the outer shell 110 can be connected by welding or other methods. Therefore, there is no need to consider the insulation between the outer shell 110 and the pole piece 122. Instead of performing surface treatment and heating on the outer shell 110, which has a larger surface area, to increase its connection stability with the pole piece 122, it is only necessary to perform surface treatment and heating on the support ring 121, which has a smaller surface area and is directly connected to the pole piece 122, to increase its insulation connection stability with the pole piece 122. This saves production costs and improves production efficiency.

[0071] like Figure 9 As shown, in one embodiment, the insulating ring 123 includes an upper sheet 1231 and a lower sheet 1232; the upper sheet 1231 includes a first sheet 12311 and a second sheet 12312; the pole piece 122 includes a pole piece 1222; Step S300, which involves insulatingly mounting the pole piece 122 one-to-one with each of the support rings 121 of the support strip 200 through the insulating ring 123 to form a plurality of pole piece assemblies 120 on the support strip 200, includes: S310, control the first piece 12311 and the lower piece 1232 to adhere to the opposite sides of the support ring 121, and the second piece 12312 passes through the support ring 121 to connect to the lower piece 1232.

[0072] S320, the column 1222 is passed through the insulating ring 123 and the support ring 121, and both ends of the column 1222 are stamped to form a top electrode plate 1221 and a bottom electrode plate 1223 at the two ends of the column 1222, respectively. The top electrode plate 1221 abuts the first piece 12311 against the top of the support ring 121, and the bottom electrode plate 1223 abuts the lower piece 1232 against the bottom of the support ring 121, so as to form the pole assembly 120 on the support strip 200.

[0073] In one embodiment, the insulating ring 123 is an insulating rubber ring. The thickness of the insulating rubber ring can be set according to actual conditions, as long as it ensures that the pole piece 122 is securely mounted on the support ring 121 through the insulating rubber ring, and ensures the insulation between the pole piece 122 and the support ring 121.

[0074] In one embodiment, the thickness of the insulating ring 123 is 0.08~0.18mm.

[0075] Step S300, which involves insulatingly mounting the pole piece 122 one-to-one with each of the support rings 121 of the support strip 200 through the insulating ring 123 to form a plurality of pole piece assemblies 120 on the support strip 200, includes: S330. The pole piece 122 is bonded to the support ring 121 through the insulating ring 123 to form the pole assembly 120 on the support strip 200.

[0076] In one embodiment, before performing half-cut stamping on the plurality of support rings 121 spaced apart on the support strip 200 in step S200, the method further includes: S500: The support strip 200 is electroplated to form an electroplated layer 1211 on the surface of all support rings 121 of the support strip 200. Understandably, the electroplated layer 1211 is used to improve the surface smoothness of the support rings 121. The thickness of the electroplated layer 1211 can be set according to actual conditions. In one embodiment, the thickness of the electroplated layer 1211 is 0.2~2μm.

[0077] S600, the support strip 200 is passivated to form a first passivation layer 1212 on the surface of all the support rings 121. Understandably, the first passivation layer 1212 can increase the affinity between the support rings 121 and the insulating rings 123, increasing adhesion and thus strengthening the sealing performance of the housing. The thickness of the first passivation layer 1212 can be set according to actual conditions. In one embodiment, the thickness of the first passivation layer 1212 is 5~50 nm.

[0078] The above are merely embodiments of the shell, electrochemical device, and preparation method of the present invention, and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A housing, characterized in that, It includes a housing (110) and a pole assembly (120); the housing (110) is provided with a receiving cavity (112) having a mounting opening (111), and a positioning step (113) is recessed around the mounting opening (111) on the outer side wall of the housing (110); The pole assembly (120) includes a support ring (121), a pole piece (122), and an insulating ring (123). The support ring (121) is positioned and installed on the outer side wall of the outer shell (110) via the positioning step (113). The pole piece (122) is insulated and installed on the support ring (121) via the insulating ring (123). The pole piece (122) extends into the receiving cavity (112) through the insulating ring (123), the support ring (121), and the mounting port (111). The support ring (121) is sequentially covered with an electroplated layer (1211) and a first passivation layer (1212); and / or The support ring (121) is made of stainless steel alloy, aluminum alloy, or nickel alloy; and / or The pole piece (122) is made of aluminum; and / or The pole piece (122) is covered with a second passivation layer (1224).

2. The housing according to claim 1, characterized in that, The insulating ring body (123) includes an upper sheet (1231) and a lower sheet (1232); The pole piece (122) includes a top pole plate (1221), a pole body (1222), and a bottom pole plate (1223). The bottom pole plate (1223) is located in the receiving cavity (112). One end of the pole body (1222) is connected to the top pole plate (1221), and the other end of the pole body (1222) passes through the insulating ring (123), the support ring (121), and the mounting port (111) to connect to the bottom pole plate (1223). The lower sheet (1232) is insulated against the bottom electrode plate (1223) and the support ring (121). The upper sheet (1231) includes a first sheet (12311) insulated against the top electrode plate (1221) and the support ring (121), and a second sheet (12312) insulated between the column (1222) and the support ring (121). The second sheet (12312) extends from the bottom end of the first sheet (12311) toward the lower sheet (1232).

3. The housing according to claim 2, characterized in that, The pole assembly (120) also includes a washer (124); the bottom end of the washer (124) abuts against the bottom pole plate (1223), and the top end of the washer (124) abuts against the bottom end of the lower plate (1232) and the second plate (12312).

4. The housing according to claim 1, characterized in that, The insulating ring (123) is an insulating rubber ring bonded between the support ring (121) and the pole piece (122).

5. The housing according to claim 1, characterized in that, The positioning step (113) is provided with a first guide surface (1131), and the support ring (121) is provided with a second guide surface (1213) at a position opposite to the first guide surface (1131); and / or The support ring (121) is welded to the outer wall of the outer shell (110).

6. An electrochemical device, characterized in that, Includes the housing as described in any one of claims 1 to 5.

7. A method for preparing a shell as described in any one of claims 1 to 5, characterized in that, include: The outer casing (110) is stamped to form a positioning step (113) at the edge of the mounting opening (111); A plurality of support rings (121) spaced apart on the support strip (200) are subjected to a half-cut stamping process to form a half-cut step around each of the support rings (121); The pole piece (122) is insulatedly installed on each of the support rings (121) of the support strip (200) one by one through the insulating ring (123) to form a plurality of pole pieces (120) on the support strip (200); Positioning is achieved by positioning the support ring (121) of the pole post assembly (120) on the outer side wall of the outer shell (110) using the positioning step (113), and controlling the pole post assembly (120) to separate from the support strip (200) to confirm that the shell assembly is complete.

8. The method for preparing the shell according to claim 7, characterized in that, The insulating ring body (123) includes an upper sheet (1231) and a lower sheet (1232); the upper sheet (1231) includes a first sheet (12311) and a second sheet (12312); the pole piece (122) includes a pole piece (1222); The method of insulatingly mounting the pole piece (122) on each of the support rings (121) of the support strip (200) through the insulating ring (123) to form a plurality of pole piece assemblies (120) on the support strip (200) includes: The first piece (12311) and the lower piece (1232) are attached to the opposite sides of the support ring (121), and the second piece (12312) passes through the support ring (121) and connects to the lower piece (1232); The column (1222) is passed through the insulating ring (123) and the support ring (121), and both ends of the column (1222) are stamped to form a top electrode plate (1221) and a bottom electrode plate (1223) at the two ends of the column (1222), respectively. The top electrode plate (1221) abuts the first piece (12311) against the top of the support ring (121), and the bottom electrode plate (1223) abuts the lower piece (1232) against the bottom of the support ring (121) to form the pole assembly (120) on the support strip (200).

9. The method for preparing the shell according to claim 7, characterized in that, The insulating ring body (123) is an insulating rubber ring; The method of insulatingly mounting the pole piece (122) on each of the support rings (121) of the support strip (200) through the insulating ring (123) to form a plurality of pole piece assemblies (120) on the support strip (200) includes: The pole piece (122) is bonded to the support ring (121) via the insulating ring (123) to form the pole assembly (120) on the support strip (200).

10. The method for preparing the shell according to claim 7, characterized in that, Before performing the half-cut stamping process on the multiple support rings (121) spaced apart on the support strip (200), the process also includes: The support strip (200) is electroplated to form an electroplated layer (1211) on the surface of all the support rings (121) of the support strip (200); The support strip (200) is passivated to form a first passivation layer (1212) on the surface of all the support rings (121).

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