Assembly method of cylindrical battery structure and cylindrical battery

Abstract

The present invention relates to an assembly method for a cylindrical battery structure and a cylindrical battery, wherein the assembly method comprises the following steps: S1, spreading a positive tab and a negative tab on the same end face of a battery cell to obtain a semi-finished product A; connecting a cap and a transition component to obtain a semi-finished product B, wherein the transition component comprises a positive electrode transition piece and a negative electrode transition piece; S2, connecting the positive electrode transition piece of semi-finished product B to the positive tab of semi-finished product A, and connecting the negative electrode transition piece of semi-finished product B to the negative electrode tab of semi-finished product A, to obtain a semi-finished product C; S3, bending the cap along the semi-finished product C so that the positive electrode column on the cap fits the semi-finished product C, and connecting the positive electrode column and the semi-finished product C to obtain a semi-finished product D; S4, installing the semi-finished product D into a housing, and fixing the semi-finished product D to the housing to obtain a semi-finished product E; S5, injecting an electrolyte into the semi-finished product E to obtain a cylindrical battery. The present invention uses a simple method to achieve the connection of the cap, tabs, and transition piece, optimizes the process, and improves the welding quality rate and the mass production capacity of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an assembling method of a cylindrical battery structure and a cylindrical battery. Background Art

[0002] In the lithium battery field, lithium-ion batteries can be divided into cylindrical, prismatic, and pouch batteries based on their packaging methods. The components of these three types of batteries are similar, with the core difference being that cylindrical and prismatic batteries use metal as their outer shells, while pouch batteries use aluminum-plastic film. Furthermore, cylindrical and prismatic batteries are often manufactured using a winding process, while pouch batteries are often manufactured using a lamination process.

[0003] Among them, cylindrical batteries have the most mature production process, offering advantages in production efficiency, yield rate, investment cost, and product consistency. Furthermore, in terms of safety, cylindrical batteries have low cell capacity, resulting in less energy released in the event of thermal runaway. Furthermore, the curved surface of cylindrical batteries allows for line contact between cells, which, compared to the surface contact of square and soft-pack batteries, limits heat transfer between cells to a certain extent, making it less likely to cause heat spread.

[0004] Research has found that increasing cylindrical size can improve energy density and assembly efficiency, reducing system costs and BMS complexity. Cylindrical batteries can be categorized by size, including the common 18650, which is 18mm in diameter and 65mm in height, as well as the common 21700 and 4680 sizes.

[0005] Among them, the 46 series cylindrical batteries can significantly reduce costs and improve energy density due to their larger size and reduced number of structural parts. For this reason, the lithium battery field mainly focuses on the research and development of the 46 series cylindrical batteries.

[0006] The tab processing technology of the 4680 series cylindrical battery mainly adopts the flattening process, that is, the tabs are produced at both ends of the battery cell, and then the tabs are flattened. After flattening, the busbars are welded at both ends of the battery. The positive and negative poles of the battery are at both ends of the battery.

[0007] To facilitate understanding of the above-mentioned tab processing technology, two references are provided as follows:

[0008] 1. A Chinese invention patent (CN112038704A) discloses an automated assembly process for cylindrical lithium-ion batteries with full tabs, describing the manufacturing process for batteries with positive and negative terminals at both ends. However, the battery with positive and negative terminals disclosed in the aforementioned patent has the following shortcomings: both the positive and negative busbars are bent, wasting space; and the battery housing is uncharged, meaning the positive terminal is located at one end and the negative terminal at the other, hindering the subsequent assembly and connection of the module and battery pack.

[0009] 2. A Chinese invention patent (CN115036585A) discloses a battery structure with a tab at one end and a battery assembly method. The tab and adapter are first welded, and then the laser penetrates the cap and adapter for welding. The shortcomings of the battery assembly method disclosed in the above document are as follows: after the tab and adapter are welded, the laser penetrates the cap for welding, which easily leads to a small welding tension between the tab and the adapter. The adapter and the cap need to be moved and pressed during the welding process, which will cause the tab and the adapter to be detached, and easily lead to defects such as welding through and explosion points. The welding quality rate is low, and it is not suitable for mass production of batteries.

[0010] In summary: the existing connection method of battery caps, tabs and adapters is complicated, the process stability is poor, the welding yield is poor, and the battery mass production capacity is low. Summary of the Invention

[0011] In view of the deficiencies in the prior art, the present invention discloses an assembly method for a cylindrical battery structure and a cylindrical battery.

[0012] The technical solutions adopted in the present invention are as follows:

[0013] A method for assembling a cylindrical battery structure comprises the following steps:

[0014] S1. Spread the positive and negative tabs on the same end face of the battery cell to obtain a semi-finished product A; connect the cap and the adapter component to obtain a semi-finished product B, wherein the adapter component includes a transfer insulator, a positive transfer sheet, and a negative transfer sheet, the transfer insulator defines two accommodating portions, the positive transfer sheet and the negative transfer sheet are respectively engaged and fixed with the two accommodating portions, the negative transfer sheet includes a negative current collecting disc, a bent portion, and an extended portion, the bent portion and the extended portion are both arranged in the same direction along the radial direction of the negative current collecting disc, and the bent portion connects the extended portion and the cap;

[0015] S2. Connecting the positive electrode adapter of the semi-finished product B to the positive electrode tab of the semi-finished product A, and connecting the negative electrode adapter of the semi-finished product B to the negative electrode tab of the semi-finished product A to obtain a semi-finished product C;

[0016] S3, bending the cap along the semi-finished product C so that the positive electrode column on the cap fits the semi-finished product C, and connecting the positive electrode column and the semi-finished product C to obtain a semi-finished product D;

[0017] S4, loading the semi-finished product D into a housing, fixing the semi-finished product D to the housing, and obtaining a semi-finished product E;

[0018] S5. Inject electrolyte into the semi-finished product E to obtain a cylindrical battery.

[0019] In some embodiments, in step S1, the assembly process of the semi-finished product A includes the following steps:

[0020] Cutting the positive electrode sheet and the negative electrode sheet according to a preset size, and die-cutting the positive electrode sheet and the negative electrode sheet to form a tab area, wherein the positive electrode sheet and the negative electrode sheet are formed with alternating tab areas and non-tab areas, and the tab area is die-cut to form at least one tab;

[0021] The positive electrode sheet, the negative electrode sheet and the separator are wound to form a battery cell;

[0022] The battery cell is shaped to obtain a semi-finished product A.

[0023] In some embodiments, the extension portion and the cap are connected by welding.

[0024] In some embodiments, the cap and the negative electrode adapter plate of the adapter component are connected by welding.

[0025] In some embodiments, the cap includes a negative electrode cover plate, the positive electrode column and an insulating member, the negative electrode cover plate has a pole through hole, the insulating member has a positioning hole, one end of the positive electrode column passes through the pole through hole, the other end of the positive electrode column extends out of the positioning hole, and the insulating member supports the negative electrode cover plate.

[0026] In some embodiments, the positive electrode adapter of the semi-finished product B and the positive electrode tab of the semi-finished product A, as well as the negative electrode adapter of the semi-finished product B and the negative electrode tab of the semi-finished product A are connected by welding.

[0027] In some embodiments, in step S3, the cap is bent twice along the semi-finished product C, wherein the first bending angle is 90° and the second bending angle is 180°.

[0028] In some embodiments, in step S3, the positive electrode column and the positive electrode adapter of the semi-finished product C are connected by welding.

[0029] In some embodiments, the welding method is ultrasonic torque welding.

[0030] In some embodiments, in step S4, the cap of the semi-finished product E and the shell are connected by welding.

[0031] A cylindrical battery is assembled using the cylindrical battery assembly method described above.

[0032] An electrical device comprises the battery as described above.

[0033] The above technical solution of the present invention has the following advantages over the prior art:

[0034] The assembly method of the cylindrical battery structure described in the present invention uses a simple assembly method to achieve electrical connection between the cap, the tab and the adapter, optimizes the existing assembly process of the cylindrical battery, and improves the welding quality and the mass production capacity of the battery.

[0035] In the assembly method of the cylindrical battery structure described in the present invention, the negative electrode adapter is designed as an adapter with a bent portion and an extended portion, which is conducive to the electrical connection between the cap and the tab and also simplifies the subsequent connection process.

[0036] The assembly method of the cylindrical battery structure described in the present invention discloses all process flows and steps, discloses assembly details, solves the existing manufacturing problem of same-side tab battery cells, and is conducive to the manufacture of cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0038] Figure 1 It is a structural schematic diagram of the cylindrical battery structure in the present invention.

[0039] Figure 2 It is a structural schematic diagram of the battery cell in the present invention.

[0040] Figure 3 It is a schematic diagram of the tab cutting in the present invention.

[0041] Figure 4 It is a structural diagram of the transfer component in the present invention.

[0042] Figure 5 It is an exploded view of the transition component in the present invention.

[0043] Figure 6 It is a structural schematic diagram of the cap in the present invention.

[0044] Figure 7 It is an exploded view of the cap in the present invention.

[0045] Figure 8 It is a schematic diagram of the connection between the adapter component and the cap in the present invention.

[0046] Figure 9 It is a schematic diagram of the connection between the adapter component, the cap and the battery cell in the present invention.

[0047] Figure 10 It is a schematic diagram of the bending of the adapter component and the cap in the present invention.

[0048] Figure 11 It is a schematic diagram of the connection between the positive electrode adapter and the positive electrode column in the present invention.

[0049] Explanation of the reference numerals in the accompanying drawings in the specification: 1. Shell; 2. Adapter component; 21. Adapter insulating member; 22. Positive electrode adapter plate; 23. Negative electrode adapter plate; 231. Negative electrode current collecting plate; 232. Bending portion; 233. Extension portion; 3. Cap; 31. Negative electrode cover plate; 32. Positive electrode column; 33. Insulating member; 4. Battery cell; 5. Positive electrode ear; 6. Negative electrode ear; 7. Support insulating member; 8. Pole ear area; 9. Non-pole ear area. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0053] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean 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 also mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1:

[0057] Combine Figure 1 、 Figure 2 and Figures 8-11 , a method for assembling a cylindrical battery structure, comprising the following steps:

[0058] S1. Spread the positive electrode tab 5 and the negative electrode tab 6 on the same end surface of the battery cell 4 to obtain a semi-finished product A; connect the cap 3 and the adapter component 2 to obtain a semi-finished product B, wherein the adapter component 2 includes a positive electrode adapter plate 22 and a negative electrode adapter plate 23;

[0059] like Figure 3 As shown, specifically, the assembly process of the semi-finished product A includes the following steps:

[0060] The positive electrode sheet and the negative electrode sheet are cut into pieces according to a preset size, and the positive electrode sheet and the negative electrode sheet are die-cut to form a tab region 8, wherein both the positive electrode sheet and the negative electrode sheet are formed with alternating tab regions 8 and non-tab regions 9, and at least one tab is die-cut into the tab region 8; preferably, the positive electrode sheet and the negative electrode sheet are formed into the tab region 8 by laser die-cutting;

[0061] The positive electrode sheet, the negative electrode sheet, and the separator are wound to form a battery cell 4; specifically, the die-cut electrode sheet is wound on a winding machine, and the tabs are pre-shaped while winding so that the tabs are tilted toward the inside of the winding core to obtain a winding core;

[0062] The battery cell 4 is shaped to obtain a semi-finished product A. Specifically, the tabs of the completed winding core are shaped so that the tabs are completely and densely spread on the end surface of the winding core to obtain a semi-finished product A.

[0063] S2. Connect the positive electrode adapter 22 of semi-finished product B to the positive electrode tab 5 of semi-finished product A, and connect the negative electrode adapter 23 of semi-finished product B to the negative electrode tab 6 of semi-finished product A to obtain semi-finished product C;

[0064] S3, bend the cap 3 along the semi-finished product C so that the positive electrode column 32 on the cap 3 fits the semi-finished product C, and connect the positive electrode column 32 and the semi-finished product C to obtain a semi-finished product D;

[0065] Among them, the negative electrode adapter 23 and the cap 3 are first welded together; then the adapter and the tabs are welded together by laser pulse welding, wherein the positive electrode adapter 22 and the positive tab 5 are welded together, and the negative electrode adapter 23 and the negative tab 6 are welded together; finally, the cap 3 is bent twice along the semi-finished product C, wherein the first bending angle is 90°, leaving a crease, and the second bending angle is 180°, bending along the crease so that the positive pole 32 of the cap 3 and the raised position of the positive electrode adapter 22 are completely fitted together;

[0066] S4, loading the semi-finished product D into the housing 1, fixing the semi-finished product D to the housing 1, and obtaining the semi-finished product E;

[0067] S5. Inject electrolyte into the semi-finished product E to obtain a cylindrical battery.

[0068] The above provides an assembly method for a cylindrical battery structure, which uses a simple assembly method to achieve electrical connection between the cap, the tab and the adapter, optimizes the process, and improves the welding quality and the mass production capacity of the battery.

[0069] In this embodiment, the positive electrode sheet includes a positive current collector and a positive active material layer coated on opposite sides of the positive current collector. The negative electrode sheet includes a negative current collector and a negative active material layer coated on opposite sides of the negative current collector. The battery cell 4 corresponds to the portion of the electrode sheet coated with the active material layer. The positive tabs are the portion of the positive electrode sheet not coated with the positive active material layer, and the negative tabs are the portion of the negative electrode sheet not coated with the negative active material layer. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative current collector can be made of copper, and the negative active material can be carbon or silicon. To ensure high current flow without melting, multiple positive tabs 5 and multiple negative tabs 6 are required. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0070] In this embodiment, the positive electrode tab 5 is made of aluminum foil, and the negative electrode tab 6 is made of copper foil. Preferably, the thickness of the aluminum foil is 10 μm-20 μm, and the thickness of the copper foil is 4 μm-10 μm.

[0071] The positive electrode adapter plate 22 is made of 1060-O aluminum, which has a hardness of less than 30HV and a thickness of ≤0.4mm. The preferred thickness of the positive electrode adapter plate 22 is 0.2mm or 0.3mm, which is conducive to the subsequent ultrasonic torque welding operation.

[0072] The negative electrode adapter plate 23 is made of T2 copper material with a thickness of ≤0.4 mm. The preferred thickness of the negative electrode adapter plate 23 is 0.2 mm or 0.3 mm. It can be nickel-plated or not, which is beneficial for subsequent laser welding operations.

[0073] The positive electrode post on cap 3 is made of 1060 aluminum or 3003 aluminum, with a hardness greater than 30 HV, to prevent deformation and facilitate subsequent ultrasonic torque welding. Cap 3 is also made of steel and electroplated with nickel, where the phosphorus content is less than 1%, to reduce laser welding cracking.

[0074] In this embodiment, the adapter and the tab are welded together by laser pulse welding. The peak power of the laser pulse welding is 5000W-7000W, the welding residue is greater than 50%, and the welding tension is greater than 10N.

[0075] Combine Figure 4 and Figure 5 In this embodiment, the adapter component 2 further includes an adapter insulator 21. The adapter insulator 21 has two accommodating portions. The positive electrode adapter plate 22 and the negative electrode adapter plate 23 are respectively fixedly engaged with the two accommodating portions. Figure 5 As shown, in this embodiment, the negative electrode adapter plate 23 includes a negative electrode current collecting disc 231, a bent portion 232, and an extension portion 233. The bent portion 232 and the extension portion 233 are both arranged in the same radial direction of the negative electrode current collecting disc 231, and the bent portion 232 connects the extension portion 233 and the cap 3. The extension portion 233 and the cap 3 are connected by welding, and the cap 3 and the negative electrode adapter plate 23 of the adapter component 2 are connected by welding, preferably using continuous laser welding, more preferably using single-mode laser welding, with a welding power of 1000W-2000W; the weld penetration is greater than 0.2mm, the weld width is greater than 0.3mm, and the weld length is greater than 10mm.

[0076] Combine Figure 6 and Figure 7 In this embodiment, the cap 3 includes a negative electrode cover plate 31, a positive electrode post 32, and an insulating member 33. The negative electrode cover plate 31 defines a post through-hole, and the insulating member 33 defines a positioning hole. One end of the positive electrode post 32 passes through the post through-hole, and the other end of the positive electrode post 32 extends out of the positioning hole. The insulating member 33 supports the negative electrode cover plate 31. Because the negative electrode cover plate 31 is welded to the housing 1, the housing of the cylindrical battery in the present invention is charged.

[0077] In this embodiment, in step S3, the positive electrode post 32 and the positive electrode adapter 22 of the semi-finished product C are connected by welding. Specifically, ultrasonic torque welding is used to weld the positive electrode post 32 and the positive electrode adapter 22. The diameter of the welding needle is less than the diameter of the center hole of the winding core, the welding energy is 20J-100J, the weld residual area is greater than 50%, and the welding tension is greater than 20N.

[0078] In step S4, the cap 3 and the shell 1 of the semi-finished product E are connected by welding, and the cap 3 and the shell 1 are sealed by laser continuous welding. The welding power is 1000W-1500W, the penetration depth is greater than 0.3mm, the penetration width is greater than 0.6mm, and the tensile strength is greater than 1.2Mpa.

[0079] Furthermore, the assembly method of the cylindrical battery structure also includes baking, standing, forming and sealing. The baking is performed after step S4 and before step S5. The baking temperature is 80°C-110°C, the baking time is 4h-16h, and the water content is less than 300PPM. The standing, forming and sealing processes are performed after step S5. Among them, the sealing can be performed by assembling a sealing steel nail onto the liquid filling port of the battery, and the sealing steel nail is sealed by laser welding.

[0080] It should be noted that welding must be performed in the order of the above process flow. The tabs need to be die-cut before winding, mainly because they are already formed after winding and cannot be cut. Before the winding core is inserted into the winding needle, the tabs are pre-bent, that is, the tabs are flattened, and then wound into the winding needle. The purpose is to make the tabs tilt toward the inside of the winding core. If this step is not performed, the tabs will be in an upright state, and it will be impossible to flatten the entire tab, that is, to reshape the battery cell 4, which will affect the quality of the subsequent laser welding process.

[0081] The purpose of shaping the tabs is to improve the density and flatness between the tabs and ensure the welding quality.

[0082] The negative electrode adapter 23 and the cap 3 are welded first, with the purpose of electrically connecting the adapter and the tab first. If the adapter and the tab are welded before the adapter and the cap 3 are welded, the welding tension between the tab and the adapter is small, and the adapter and the cap 3 need to be moved and pressed during the welding process, which will cause the tab and adapter that have been welded first to separate, resulting in defective products.

[0083] The reason cap 3 must be bent along semi-finished product C after welding the adapter and tab is to weld the adapter and tab first. This allows the tab and adapter to be aligned, facilitating welding. If pre-bent, cap 3 will be erected, and the adapter's low strength will make it difficult to support the cap 3. Furthermore, an erected cap 3 risks blocking laser transmission and interfering with welding. Only after cap 3 is bent and fastened along semi-finished product C can the protrusions of positive electrode column 32 and positive adapter 22 come into close contact for torque welding.

[0084] The last steps are shell insertion, sealing welding, etc. Example 2:

[0085] like Figure 1 As shown, a cylindrical battery is assembled using the cylindrical battery assembly method provided in Example 1.

[0086] Combine Figure 2 and Figures 4-10 Specifically, the cylindrical battery includes:

[0087] Battery cell 4, with a positive electrode tab 5 and a negative electrode tab 6 extending from the same side of the battery cell 4;

[0088] The housing 1 is used to house the battery cell 4. Specifically, the housing 1 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both ends. The housing 1 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys. The housing 1 is cylindrical in shape. When the housing 1 is a hollow structure with openings at both ends, one opening is sealed by welding with a metal sheet, and the other opening is sealed by welding with a cap 3.

[0089] The cap 3 includes a negative electrode cover plate 31, a positive electrode post 32, and an insulating member 33. The negative electrode cover plate 31 is provided with a through-hole, through which the positive electrode post 32 passes. The positive electrode post 32 is insulated and connected to the negative electrode cover plate 31 by the insulating member 33. The projected shape of the negative electrode cover plate 31 can be adapted to the projected shape of the housing 1. For example, if the housing 1 is a cylindrical structure, the negative electrode cover plate 31 is a circular plate-shaped structure adapted to the housing 1. The negative electrode cover plate 31 can also be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloy. The material of the positive electrode post 32 can be a conductive metal material such as aluminum, and the insulating member 33 can be an insulating material such as rubber.

[0090] The adapter component 2 includes an adapter insulator 21, a positive adapter plate 22, and a negative adapter plate 23. The positive adapter plate 22 and the negative adapter plate 23 are insulated and connected by the adapter insulator 21. The positive adapter plate 22 is used to electrically connect the positive column 32 and the positive ear 5. The negative adapter plate 23 includes a negative current collector 231, a bent portion 232, and an extension 233. The negative current collector 231 is parallel to the extension 233. The bent portion 232 is arranged between the negative current collector 231 and the extension 233. The negative current collector 231 is electrically connected to the negative ear 6, and the extension 233 is connected to the cap 3. It should be noted that Figure 5 and Figure 8 In the embodiment, the shape of the extension portion 233 is arc-shaped, but is not limited to this shape. The area of ​​the extension portion 233 can be appropriately increased to increase the flow area and improve the flow capacity of the negative current collecting disc 231. Therefore, the shape of the extension portion 233 is not limited. The contact surface between the positive electrode adapter 22 and the transfer insulator 21, and the contact surface between the negative electrode adapter 23 and the transfer insulator 21 are surface treated, such as by chemical etching and laser engraving, to form nanopores on the contact surface. The transfer insulator 21 is injection molded between the positive electrode adapter 22 and the negative electrode adapter 23.

[0091] Combine Figure 4 and Figure 5The positive electrode adapter 22 includes an integrally formed main body and a first protrusion. The main body is connected to the positive electrode tab 5. The first protrusion protrudes toward and is connected to the positive electrode post 32. The adapter insulator 21 is provided with a first avoidance hole at a position corresponding to the first protrusion. The positive electrode post 32 is a hollow structure, and the first protrusion is connected to the positive electrode post 32 with a concave-convex fit.

[0092] In the above embodiment, by providing a protrusion protruding toward the positive electrode post 32 on the positive electrode adapter 22, the positive electrode adapter 22 can be brought into contact with and welded to the positive electrode post 32. At the same time, the main body is brought into contact with and welded to the positive electrode tab 5, so that the positive electrode tab 5 is connected to the positive electrode post 32 through the positive electrode adapter 22. Because the protrusion needs to contact the positive electrode post 32, the adapter insulator 21 is provided with an avoidance hole at the corresponding position, so that the protrusion can pass through the avoidance hole, thereby completing the contact between the protrusion and the positive electrode post 32.

[0093] Preferably, the positive electrode adapter plate 22 and the negative electrode adapter plate 23 are respectively provided with a plurality of second protrusions and third protrusions extending toward the battery cell 4, and the adapter insulating member 21 is provided with second avoidance holes at corresponding positions of the second protrusions and the third protrusions. Figure 4 In the figure, the positive electrode adapter 22 and the negative electrode adapter 23 are respectively provided with three second and third protrusions extending toward the battery cell 4. During welding, the positive electrode adapter 22 is welded to the positive electrode tab 5 by pressing the second protrusion against the positive electrode tab 5, and then laser penetration welding is performed to connect the positive electrode adapter 22 with the positive electrode tab 5, thereby preventing the welding of the positive electrode tab 5 and the positive electrode adapter 22 from causing a cold weld. The negative electrode adapter 23 is welded to the negative electrode tab 6 by pressing the third protrusion against the negative electrode tab 6, and then laser penetration welding is performed to connect the negative electrode adapter 23 with the negative electrode tab 6, thereby preventing the welding of the negative electrode tab 12 and the negative electrode current collecting plate 231 from causing a cold weld. Because laser penetration welding is required, a second avoidance hole is provided in the adapter insulator 21 to expose the second and third protrusions for welding. Since the second protrusion is exposed through the second avoidance hole, in order to prevent the second protrusion from contacting the cap 3 , the shape of the transition insulating member 21 needs to be able to cover the second protrusion, thereby isolating the second protrusion from the cap 3 .

[0094] Furthermore, by providing an injection hole at the bottom of the cap 3 or the housing 1, the cylindrical battery can be filled with electrolyte through the injection hole. After the injection is completed, the injection hole can be sealed with a sealing steel nail. By providing an explosion-proof valve at the bottom of the cap 3 or the housing 1, when thermal runaway occurs in the cylindrical battery, the internal gas can be discharged through the explosion-proof valve in a timely manner, thereby completing the pressure relief and ensuring the safety of the cylindrical battery.

[0095] like Figure 11As shown, optionally, a supporting insulating member 7 is provided at the bottom of the battery, and the supporting insulating member 7 is used to prevent the bottom of the battery cell 4 from contacting the bottom inner wall of the shell 1 and causing a short circuit. Example 3:

[0096] An electrical device includes the battery provided in Example 2. The basic structure, principles, and technical effects of the battery are the same as those in Example 2. For the sake of brevity, any details not mentioned in this example are referenced to the corresponding content in Example 2. The primary design point of the present invention lies in the improved assembly method of the cylindrical battery structure. Other structures of the electrical device, such as the electrical connection and mechanical structure of the electrical device, will not be described in detail here.

[0097] Electrical equipment can be cars, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Cars can be fuel cars, gas cars, or new energy cars. New energy cars can be pure electric cars, hybrid cars, or extended-range cars, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present invention do not impose any special restrictions on the above-mentioned electrical equipment.

[0098] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0099] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for assembling a cylindrical battery structure, characterized in that The following steps are involved: S1. Spreading the positive electrode tab (5) and the negative electrode tab (6) on the same end face of the battery cell (4) to obtain a semi-finished product A; connecting the cap (3) and the transition component (2) to obtain a semi-finished product B, wherein the transition component (2) includes a transition insulating member (21), a positive electrode transition piece (22) and a negative electrode transition piece (23); the transition insulating member (21) has two accommodating portions, and the positive electrode transition piece (22) and the negative electrode transition piece (23) are respectively engaged and fixed with the two accommodating portions; the negative electrode transition piece (23) includes a negative electrode current collecting disc (231), a bending portion (232) and an extension portion (233); the bending portion (232) and the extension portion (233) are both arranged in the same direction along the radial direction of the negative electrode current collecting disc (231); the bending portion (232) connects the extension portion (233) and the cap (3); S2, connecting the positive electrode adapter (22) of the semi-finished product B and the positive electrode tab (5) of the semi-finished product A, and connecting the negative electrode adapter (23) of the semi-finished product B and the negative electrode tab (6) of the semi-finished product A to obtain a semi-finished product C; S3, bending the cap (3) along the semi-finished product C so that the positive electrode column (32) on the cap (3) fits the semi-finished product C, and connecting the positive electrode column (32) and the semi-finished product C to obtain a semi-finished product D; S4, loading the semi-finished product D into the housing (1), fixing the semi-finished product D to the housing (1), and obtaining a semi-finished product E; S5. Inject electrolyte into the semi-finished product E to obtain a cylindrical battery.

2. The method for assembling a cylindrical battery structure according to claim 1, wherein: In step S1, the assembly process of the semi-finished product A includes the following steps: Cutting the positive electrode sheet and the negative electrode sheet according to a preset size, and die-cutting the positive electrode sheet and the negative electrode sheet to form a tab area (8), wherein the positive electrode sheet and the negative electrode sheet are both formed with alternately distributed tab areas (8) and non-tab areas (9), and the tab area (8) is die-cut to form at least one tab; The positive electrode sheet, the negative electrode sheet, and the separator are wound to form a battery cell (4); The battery cell (4) is shaped to obtain a semi-finished product A.

3. The method for assembling a cylindrical battery structure according to claim 1, wherein: The extension portion (233) and the cap (3) are connected by welding.

4. The method for assembling a cylindrical battery structure according to claim 1, wherein: The cap (3) and the negative electrode adapter plate (23) of the adapter component (2) are connected by welding.

5. The method for assembling a cylindrical battery structure according to claim 1, wherein: The cap (3) comprises a negative electrode cover plate (31), the positive electrode column (32) and an insulating member (33); the negative electrode cover plate (31) is provided with a column through hole; the insulating member (33) is provided with a positioning hole; one end of the positive electrode column (32) passes through the column through hole; the other end of the positive electrode column (32) extends out of the positioning hole; and the insulating member (33) supports the negative electrode cover plate (31).

6. The method for assembling a cylindrical battery structure according to claim 1, wherein: The positive electrode adapter (22) of the semi-finished product B and the positive electrode tab (5) of the semi-finished product A, as well as the negative electrode adapter (23) of the semi-finished product B and the negative electrode tab (6) of the semi-finished product A, are all connected by welding.

7. The method for assembling a cylindrical battery structure according to claim 1, wherein: In step S3, the cap (3) is bent twice along the semi-finished product C, wherein the first bending angle is 90° and the second bending angle is 180°.

8. The method for assembling a cylindrical battery structure according to claim 1, wherein: In step S3, the positive electrode column (32) and the positive electrode adapter (22) of the semi-finished product C are connected by welding.

9. The method for assembling a cylindrical battery structure according to claim 8, wherein: The welding method is ultrasonic torque welding.

10. The method for assembling a cylindrical battery structure according to claim 1, wherein: In step S4, the cap (3) of the semi-finished product E and the shell (1) are connected by welding.

11. A cylindrical battery, characterized in that: The cylindrical battery is assembled using the cylindrical battery assembly method according to any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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