Battery assembly method and battery

Abstract

This invention belongs to the field of battery technology and discloses a battery assembly method and a battery. In this battery assembly method, since the first wall and the second wall constituting the outer casing are an integral structure, and a connection window for welding the tabs is opened on the first wall, on the one hand, after the tabs opposite to the first wall have completed the welding process, the first wall side does not need to be sealed to the outer casing through welding operations. This avoids the adverse effects of vibration, high temperature and other factors generated during the welding operation when the outer casing is closed, thus improving the welding quality. On the other hand, since the first wall and the first connecting piece are fixed together by the first pole post, and the first wall and the second wall are an integral structure, the tabs and the first connecting piece are in a relatively stable state when welding operations are performed on the tabs and the first connecting piece through the connection window, reducing the difficulty of welding the tabs and the first connecting piece.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery assembly method and a battery. Background Technology

[0002] The blade battery is constructed with electrode groups on both sides as the core components. The traditional assembly process of the blade battery usually involves first inserting the electrode group into the battery casing, then bending the electrode groups on both sides of the electrode group multiple times to form an approximate S-shape, and then installing the cover plate assembly with the terminal post into both sides of the battery casing. The electrode group is then welded to the terminal post. After the electrode group and terminal post are welded, the battery casing is then welded to the aluminum plates in the cover plate assembly on both sides to seal the battery casing, thus completing the assembly of the blade battery.

[0003] However, the blade battery assembled using this method has two main drawbacks. First, the welding of the tabs and terminals must be completed first. This means that during the welding process between the aluminum plate and the battery casing, factors such as vibration and high temperature can affect the already welded tabs and terminals, reducing the welding quality and impacting conductivity. Second, to ensure the welding quality of the tabs and terminals, relative stability between them is required. However, since the welding of the cover plate assembly to the battery casing occurs after the welding of the terminals and tabs, the cover plate assembly and the battery casing are in a relatively free state, making the welding of the tabs and terminals more difficult. Summary of the Invention

[0004] The purpose of this invention is to provide a battery assembly method and a battery that is easy to operate and produces high welding quality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On the one hand, a battery assembly method is provided, wherein the battery assembled by the battery assembly method includes a casing module, a housing unit, and a sealing module;

[0007] The battery assembly method includes the following steps:

[0008] S1. The outer shell module includes an outer shell body, a first pole post, and a first connecting piece. The outer shell body is a hollow shell structure with a single-sided opening, and includes a first wall surface opposite to the opening and a plurality of second walls surrounding the first wall surface. A connection window communicating with the cavity is opened on the first wall surface. One end of the first connecting piece is fixed to the first wall surface by the first pole post, and the other end of the first connecting piece extends to the bottom of the connection window. The shell insertion unit includes a pole group with pole tabs on both sides. The shell insertion unit is inserted into the cavity of the outer shell body, and the pole tabs opposite to the first wall surface are bent so that the pole tabs overlap the surface of the first connecting piece facing the connection window, and the opening of the outer shell body is closed.

[0009] S2. Complete the final welding of the structure that closes the opening of the outer shell body to the outer shell body;

[0010] S3. Perform welding operation on the electrode tab facing below the connection window;

[0011] S4. Place the closed module at the connection window and close the connection window.

[0012] Optionally, step S1 may further include the following steps;

[0013] S11. The electrode assembly includes a first surface and a second surface with the electrode tabs, and a plurality of side surfaces perpendicular to the first surface and the second surface. The first surface is disposed opposite to the first wall surface, and an insulating film is covered on the plurality of side surfaces of the electrode assembly.

[0014] S12. The battery further includes at least one fixed end plate, the fixed end plate having a clearance groove for the tab to pass through, and at most one fixed end plate is disposed on the first surface and thermally fused with the insulating film.

[0015] S13. The battery further includes at most one first cover plate module or at most one second cover plate module. At most one fixed end plate, or at most one first cover plate module, or at most one second cover plate module is disposed on the second surface and thermally fused with the insulating film to form the housing unit. The first cover plate module or the second cover plate module is initially welded to the housing body to close the opening of the housing body.

[0016] Optionally, in step S13, when the fixed end plate is heat-fused to the insulating film on the second surface, and the first cover plate module closes the opening of the outer shell body, step S13 includes the following steps:

[0017] S131A. The fixed end plate is placed on the second surface and thermally fused with the insulating film, and the tabs on the second surface pass through the clearance groove of the fixed end plate to form the housing unit.

[0018] S132A. The housing unit is installed into the cavity of the housing body;

[0019] S133A, the first cover plate module includes a first cover plate body, a second pole post, and a second connecting piece. The first cover plate body has a connection window that communicates with the cavity of the outer shell body. One end of the second connecting piece is fixed to the first cover plate body by the second pole post, and the other end of the second connecting piece extends to the bottom of the connection window. The first cover plate module is placed on the side of the fixed end plate away from the pole group, and the pole ear that passes through the avoidance groove on the second surface is bent so that the pole ear overlaps the surface of the second connecting piece facing the connection window.

[0020] S134A. Spot weld the first cover plate body to the outer shell body to complete the initial connection between the first cover plate module and the outer shell body.

[0021] Optionally, in step S13, when the fixed end plate is heat-fused to the insulating film on the second surface, and the second cover module closes the opening of the outer shell body, step S13 includes the following steps:

[0022] S131B, The fixed end plate is placed on the second surface and thermally fused with the insulating film, and the tabs on the second surface pass through the clearance groove of the fixed end plate to form the housing unit;

[0023] S132B. The housing unit is installed into the cavity of the housing body;

[0024] S133B, The second cover plate module includes a second cover plate body and a third pole post. The third pole post is fixedly connected to the second cover plate body. The second cover plate module is placed on the side of the fixed end plate away from the pole group, and the pole lug that passes through the avoidance groove on the second surface is bent so that the pole lug is connected to the side of the third pole post facing the pole group.

[0025] S134B. Spot weld the second cover plate body to the outer shell body to complete the initial connection between the second cover plate module and the outer shell body.

[0026] Optionally, in step S13, when the first cover plate module is disposed on the second surface and thermally fused with the insulating film, step S13 further includes the following steps:

[0027] S131C, the first cover plate module further includes a first cover plate body, a second pole post, a second connecting piece, and a first insulating member. The first cover plate body has a connection window communicating with the cavity of the outer shell body. The first insulating member is disposed on the side of the first cover plate body facing the pole group and has a through structure communicating with the connection window. One end of the second connecting piece is fixed to the first cover plate body by the second pole post, and the other end of the second connecting piece extends to the bottom of the connection window. The first cover plate body is disposed on the second surface, and the pole tabs on the second surface are bent so that the pole tabs overlap the surface of the second connecting piece facing the through structure. The first insulating member and the insulating film are thermally fused to form the housing unit.

[0028] S132C. The housing unit is installed into the cavity of the housing body, and the first cover plate body closes the opening of the housing body.

[0029] S133C. Spot weld the first cover plate body to the outer shell body to complete the initial connection between the first cover plate module and the outer shell body.

[0030] Optionally, in step S13, when the second cover plate module is disposed on the second surface and thermally fused with the insulating film, step S13 further includes the following steps:

[0031] S131D, the second cover plate module includes a second cover plate body, a second insulating member, and a third pole. The second insulating member is disposed on the side of the second cover plate body facing the pole group. One end of the third pole is fixedly connected to the second cover plate body, and the other end of the third pole passes through the second insulating member. The second cover plate body is disposed on the second surface, and the pole tab on the second surface is bent so that the pole tab is connected to the end of the third pole passing through the second insulating member. The second insulating member is then thermally fused with the insulating film to form the housing unit.

[0032] S132D. The housing unit is installed into the cavity of the housing body, and the second cover plate body closes the opening of the housing body.

[0033] S133D, and spot weld the second cover plate body to the outer shell body to complete the initial connection between the second cover plate module and the outer shell body.

[0034] Optionally, step S11 further includes the following steps:

[0035] S111, the battery further includes at least one protective side plate, and at least one of the protective side plates is pre-heat-melted to a predetermined position on the insulating film;

[0036] S112. The insulating film is wrapped around a plurality of the sides of the electrode assembly, and at least one of the protective side plates covers one of the sides of the electrode assembly.

[0037] Optionally, the enclosed module includes an enclosed plate and an insulating plate, and step S4 further includes the following steps:

[0038] S41. The first cover plate body, and / or the first wall surface away from the pole group is provided with a mounting boss, the mounting boss is provided with mounting through holes that communicate with the connection window and are distributed in a stepped manner, and a limiting step is formed between the mounting through holes and the connection window, the sealing plate includes a sealing part and a plug-in part, the insulating plate is provided on the side of the plug-in part away from the sealing part, the plug-in part of the sealing plate is inserted into the connection window, the sealing part of the sealing plate is inserted into the mounting through hole, and the sealing part abuts against the limiting step;

[0039] S42. The sealing part is welded to the first cover plate body and / or the first wall surface. The width dimension of the overlap between the limiting step and the sealing part along the first direction is W. When the sealing part and the first cover plate body and / or the first wall surface are butt welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0040] Optionally, when the closure portion is welded to the first cover plate body and / or the first wall surface through the weld, the width dimension W satisfies 1mm≤W≤20mm.

[0041] On the other hand, a battery is also provided, which is assembled using the battery assembly method described in any of the preceding claims.

[0042] The beneficial effects of this invention are:

[0043] This invention provides a battery assembly method. In this method, the first and second walls constituting the outer casing are an integral structure, and a connection window for welding tabs is provided on the first wall. On the one hand, after the tabs opposite to the first wall have completed the welding process, the first wall side does not need to be sealed to the outer casing through welding. This avoids the adverse effects of vibration, high temperature, and other factors generated during the welding process when the outer casing is closed, thus improving the welding quality. On the other hand, since the first wall and the first connecting piece are fixed together by the first pole post, and the first and second walls are an integral structure, the tabs and the first connecting piece are in a relatively stable state when welding through the connection window, reducing the difficulty of welding the tabs and the first connecting piece.

[0044] The present invention also provides a battery that, by applying the above-described battery assembly method, improves welding quality, thereby ensuring high conductivity, and improving power supply capacity and product quality. Attached Figure Description

[0045] Figure 1 This is a flowchart of the battery assembly method provided by the present invention;

[0046] Figure 2 This is a cross-sectional view of the structure of the first wall of the outer casing module in the battery provided by the present invention;

[0047] Figure 3 This is a cross-sectional view of the structure of the first cover plate body of the first cover plate module in the battery provided by the present invention;

[0048] Figure 4 This is a partial structural diagram of the first cover plate body of the battery provided by the present invention having a mounting boss;

[0049] Figure 5 This is a schematic diagram of the structure of the first insulating component within the first cover plate module provided by the present invention;

[0050] Figure 6 This is a structural exploded view of the enclosed module in the battery provided by the present invention;

[0051] Figure 7 This is a schematic diagram of the fixed end plate in the battery provided by the present invention;

[0052] Figure 8 This is an assembly diagram of the second cover plate module in the battery provided by the present invention;

[0053] Figure 9 This is a schematic diagram of the structure of the outer casing of the battery provided by the present invention.

[0054] In the picture:

[0055] 100. Connecting window; 200. Mounting boss; 300. Mounting through hole; 400. Limiting step;

[0056] 1. Outer shell module; 11. Outer shell body; 111. First wall surface; 112. Second wall surface; 12. First pole post; 13. First connecting piece;

[0057] 2. First cover plate module; 21. First cover plate body; 22. Second pole post; 23. Second connecting piece; 24. First insulating component; 241. Through structure;

[0058] 3. Enclosed module; 31. Enclosed plate; 311. Enclosed part; 312. Connecting part; 32. Insulating plate;

[0059] 4. Fixed end plate; 41. Clearance through groove;

[0060] 5. Second cover plate module; 51. Second cover plate body; 52. Third pole post; 53. Second insulating component. Detailed Implementation

[0061] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0062] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0065] Example 1

[0066] like Figures 1 to 9 As shown, the battery assembly method includes the following steps:

[0067] S1. The outer shell module 1 includes an outer shell body 11, a first pole post 12, and a first connecting piece 13. The outer shell body 11 is a hollow shell structure with a single-sided opening, and includes a first wall surface 111 opposite to the opening and a plurality of second walls surface 112 surrounding the first wall surface 111. A connecting window 100 communicating with the cavity is provided on the first wall surface 111. One end of the first connecting piece 13 is fixed to the first wall surface 111 by the first pole post 12, and the other end of the first connecting piece 13 extends to the bottom of the connecting window 100. The shell insertion unit includes a pole group with pole tabs on both sides. The shell insertion unit is installed into the cavity of the outer shell body 11, and the pole tabs opposite to the first wall surface 111 are bent so that the pole tabs overlap the surface of the first connecting piece 13 facing the connecting window 100, and the opening of the outer shell body 11 is closed.

[0068] S2. Complete the final welding of the open structure of the closed outer shell body 11 to the outer shell body 11;

[0069] S3. Perform welding operations on the tabs facing the connection window 100;

[0070] S4. Place the closed module 3 at the connection window 100 and close the connection window 100.

[0071] In this battery assembly method, since the first wall 111 and the second wall 112 constituting the outer casing 11 are an integral structure, and a connection window 100 for welding the tabs is opened on the first wall 111, on the one hand, after the tabs opposite to the first wall 111 have completed the welding process, the first wall 111 side does not need to be sealed to the outer casing 11 through welding operations. This avoids the adverse effects of vibration, high temperature and other factors generated during the welding operation when the outer casing 11 is closed after the tabs on the first wall 111 side have completed the welding operation, thus improving the welding quality. On the other hand, since the first wall 111 and the first connecting piece 13 are fixed together by the first pole post 12, and the first wall 111 and the second wall 112 are an integral structure, when welding the tabs and the first connecting piece 13 through the connection window 100, the tabs and the first connecting piece 13 are in a relatively stable state, reducing the difficulty of welding the tabs and the first connecting piece 13.

[0072] Optionally, such as Figure 2 , Figure 3 , Figure 7 As shown, step S1 also includes the following steps;

[0073] S11. The electrode assembly includes a first surface and a second surface with electrode tabs, and a plurality of side surfaces perpendicular to the first surface and the second surface. The first surface is disposed opposite to the first wall surface 111, and an insulating film is covered on the plurality of side surfaces of the electrode assembly.

[0074] S12. The battery also includes at least one fixed end plate 4, which has a clearance groove 41 for the electrode tab to pass through. At most one fixed end plate 4 is placed on the first surface and is thermally fused with the insulating film.

[0075] S13. The battery also includes at most one first cover plate module 2 or at most one second cover plate module 5. At most one fixed end plate 4, or at most one first cover plate module 2, or at most one second cover plate module 5 is disposed on the second surface and thermally fused with an insulating film to form an in-shell unit. The first cover plate module 2 or the second cover plate module 5 is initially welded to the outer shell body 11 to close the opening of the outer shell body 11.

[0076] By covering multiple sides of the electrode assembly with an insulating film, four-sided protection is achieved. Secondly, by setting up at most one fixed end plate 4 that is thermally fused to the insulating film on the first surface, and setting up at most one fixed end plate 4, or at most one second cover plate module 5, or at most one first cover plate module 2 that is thermally fused to the insulating film on the second surface, an additional layer of protection is added to the first surface and / or the second surface. This, together with the insulating film covering the sides of the electrode assembly, forms an enclosure unit with at least five-sided protection, thereby ensuring the protection of the electrode assembly during enclosure installation, preventing damage to the electrode assembly during enclosure installation, and ensuring product quality.

[0077] In step S13 of this embodiment, when the fixed end plate 4 is thermally fused to the insulating film on the second surface, and the opening opposite the second surface of the closed outer shell body 11 is the first cover plate module 2, step S13 includes the following steps:

[0078] S131A. The fixed end plate 4 is placed on the second surface and heat-fused with the insulating film, and the tabs on the second surface pass through the clearance groove 41 of the fixed end plate 4 to form the housing unit.

[0079] S132A, The housing unit is installed into the cavity of the housing body 11;

[0080] S133A, the first cover plate module 2 includes a first cover plate body 21, a second pole post 22, and a second connecting piece 23. The first cover plate body 21 has a connection window 100 that communicates with the cavity of the outer shell body 11. One end of the second connecting piece 23 is fixed to the first cover plate body 21 by the second pole post 22, and the other end of the second connecting piece 23 extends to the bottom of the connection window 100. The first cover plate module 2 is placed on the side of the fixed end plate 4 away from the pole group, and the second surface is bent to pass through the avoidance groove 41 to make the pole tab overlap the surface of the second connecting piece 23 facing the connection window 100.

[0081] S134A. Spot weld the first cover plate body 21 to the outer shell body 11 to complete the initial connection between the first cover plate module 2 and the outer shell body 11.

[0082] By providing a fixed end plate 4 that is thermally fused to the insulating film on the second surface, the second surface is protected, so that regardless of whether the fixed end plate 4 is provided on the first surface, an enclosure unit with at least five-sided protection for the electrode assembly can be formed, thereby avoiding damage to the electrode assembly during enclosure.

[0083] In this embodiment, a fixed end plate 4 is also provided on the first surface, so that fixed end plates 4 that are thermally fused to the insulating film are provided on both the first and second surfaces of the electrode assembly, thereby forming an enclosure unit with six-sided protection, which provides high protection for the electrode assembly. In addition, the first cover plate module 2 is used to close the opening between the outer shell body 11 and the second surface, so that during assembly, the welding process of closing the opening of the outer shell body 11 is located before the welding process of the electrode tabs and the second connecting piece 23 on the second surface. This avoids the impact of vibration, high temperature and other adverse factors during the welding process on the electrode tabs and the second connecting piece 23 on the second surface, which have already been welded, when the outer shell body 11 is closed and welded, thus improving the welding quality between the electrode tabs and the second connecting piece 23 on the second surface. On the other hand, since the first cover plate module 2 and the outer shell body 11 are in a fixed state, the difficulty of welding the electrode tabs and the second connecting piece 23 on the second surface is reduced.

[0084] Therefore, after the assembly steps of Embodiment 1 are completed, a battery structure is formed having a housing module 1 with a connection window 100 on the first wall surface 111, a first cover module 2 with a connection window 100 on the first cover body 21, and two fixed end plates 4. It not only has a housing unit with six-sided protection and high protection, but also ensures that the two side tabs have high welding quality.

[0085] Optionally, step S11 further includes the following steps:

[0086] S111, the battery also includes at least one protective side plate, which is pre-heat-melted into a predetermined position on the insulating film;

[0087] S112. Cover multiple sides of the electrode assembly with an insulating film and make at least one protective side plate cover one side of the electrode assembly.

[0088] Protection is provided by the side of the protective side plate electrode assembly to prevent scratches during casing insertion.

[0089] Optionally, such as Figure 2 , Figure 3 , Figure 6 As shown, the enclosed module 3 includes an enclosed plate 31 and an insulating plate 32. In step S4, the following steps are also included:

[0090] S41, the first cover plate body 21, and / or, the first wall surface 111 is provided with a mounting boss 200 on the side away from the pole group. The mounting boss 200 is provided with mounting through holes 300 that communicate with the connection window 100 and are distributed in a stepped manner. A limiting step 400 is formed between the mounting through hole 300 and the connection window 100. The sealing plate 31 includes a sealing part 311 and a plug-in part 312. The insulating plate 32 is provided on the side of the plug-in part 312 away from the sealing part 311. The plug-in part 312 of the sealing plate 31 is inserted into the connection window 100. The sealing part 311 of the sealing plate 31 is inserted into the mounting through hole 300 and the sealing part 311 abuts against the limiting step 400.

[0091] S42. Weld the closing part 311 to the first cover plate body 21 and / or the first wall surface 111. The width dimension of the overlap between the limiting step 400 and the closing part 311 along the first direction is W. When the closing part 311 and the first cover plate body 21 and / or the first wall surface 111 are butt welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0092] By limiting the width dimension W when using butt welding to ensure it is 0.5mm ≤ W ≤ 20mm, two issues are avoided: firstly, a small overlap width would lead to defects such as weld breaks and spalls during butt welding; secondly, an excessively large overlap width would increase the structural dimensions and add extra costs. In this embodiment, mounting bosses 200 are provided on both the first cover plate body 21 and the first wall surface 111.

[0093] Optionally, such as Figure 2 , Figure 3 As shown, when the closure 311 is welded to the first cover plate body 21 and / or the first wall surface 111 through weld, the width dimension W satisfies 1mm≤W≤20mm.

[0094] By limiting the width dimension W when using through welding to ensure that it is 1mm ≤ W ≤ 20mm, two advantages are achieved: firstly, a small overlap width would prevent insufficient strength between the first cover plate body 21 and / or the first wall surface 111 and the closing plate 31 after through welding, thus failing to meet the 1.2MPa pressure test requirement; secondly, an excessively large overlap width would increase the structural dimensions and incur additional costs. In this embodiment, mounting bosses 200 are provided on both the first cover plate body 21 and the first wall surface 111.

[0095] Example 2

[0096] For the sake of simplicity, the same or corresponding parts in Embodiment 2 are referred to with the same reference numerals as in Embodiment 1, and only the differences between Embodiment 2 and Embodiment 1 are described. The difference is that in step S12, the fixed end plate 4 is not provided on the first surface.

[0097] Therefore, after the assembly steps of Embodiment 2 are completed, a shell module 1 with a connection window 100 opened on the first wall surface 111, a first cover module 2 with a connection window 100 opened on the first cover body 21, and a battery structure with a fixed end plate 4 set on the second surface are formed. At this time, the fixed end plate 4 on the second surface and the insulating film form a shell unit with five-sided protection. Compared with Embodiment 1, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0098] Example 3

[0099] For the sake of simplicity, the same or corresponding parts in Embodiment 3 are referred to by the same reference numerals as in Embodiment 1. Only the differences between Embodiment 3 and Embodiment 1 are described. The difference is that step S13 in Embodiment 3 is different from step S13 in Embodiment 1.

[0100] In step S13 of this embodiment, when the fixed end plate 4 is thermally fused to the insulating film on the second surface, and the opening of the closed outer shell body 11 is the second cover plate module 5, step S13 includes the following steps:

[0101] S131B, The fixed end plate 4 is placed on the second surface and heat-fused with the insulating film, and the tabs on the second surface pass through the clearance groove 41 of the fixed end plate 4 to form the housing unit.

[0102] S132B, Install the housing unit into the cavity of the housing body 11;

[0103] S133B, the second cover plate module 5 includes a second cover plate body 51 and a third pole post 52. The third pole post 52 is fixedly connected to the second cover plate body 51. The second cover plate module 5 is placed on the side of the fixed end plate 4 away from the pole group, and the pole ear of the second surface is bent through the avoidance groove 41 so that the pole ear is connected to the side of the third pole post 52 facing the pole group.

[0104] S134B, Spot weld the second cover plate body 51 to the outer shell body 11 to complete the initial connection between the second cover plate module 5 and the outer shell body 11.

[0105] The second cover module 5 is a cover assembly of a traditional blade battery, and its type can be a traditional welded cover, a riveted cover, or a minimalist cover. In this third embodiment, the second cover module 5 is a traditional riveted cover.

[0106] In this embodiment, a fixed end plate 4 is also provided on the first surface, so that fixed end plates 4 that are thermally fused to the insulating film are provided on both the first and second surfaces of the electrode assembly, thereby forming an enclosure unit with six-sided protection, providing high protection for the electrode assembly. In addition, since the electrode tab on the other side of the electrode assembly is fixed to the first wall surface 111, the welding quality is improved. Therefore, while ensuring high welding quality of the electrode tab on one side of the electrode assembly, the use of a second cover plate module 5 with mature technology to close the opening of the outer shell body 11 helps to control manufacturing costs while improving the welding quality and welding convenience of one side of the electrode tab.

[0107] Therefore, after the assembly steps of Embodiment 3 are completed, a battery structure is formed having a housing module 1 with a connection window 100 on the first wall surface 111, a second cover module 5 for closing the opening, and two fixed end plates 4. It not only has a housing unit with six-sided protection and high protection, but also ensures that the electrode tab on one side of the electrode group has high welding quality.

[0108] Example 4

[0109] For the sake of simplicity, the same or corresponding parts in Embodiment 4 and Embodiment 3 are referred to by the same reference numerals as in Embodiment 3. Only the differences between Embodiment 4 and Embodiment 3 are described. The difference is that in step S12, the fixed end plate 4 is not provided on the first surface.

[0110] Therefore, after the assembly steps of Embodiment 4 are completed, a battery structure is formed having a housing module 1 with a connection window 100 on the first wall surface 111, a second cover module 5 for closing the opening, and a fixed end plate 4 on the second surface. At this time, the fixed end plate 4 on the second surface and the insulating film form a housing unit with five-sided protection. Compared with Embodiment 3, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0111] Example 5

[0112] For the sake of simplicity, the same or corresponding parts in Embodiment 5 are referred to with the same reference numerals as in Embodiment 1. Only the differences between Embodiment 5 and Embodiment 1 are described. The difference is that step S13 in Embodiment 1 is different from step S13 in Embodiment 3.

[0113] In step S13 of this embodiment, when the first cover plate module 2 is thermally fused to the insulating film on the second surface, step S13 includes the following steps:

[0114] S131C, the first cover plate module 2 also includes a first cover plate body 21, a second pole post 22, a second connecting piece 23 and a first insulating member 24. The first cover plate body 21 has a connection window 100 communicating with the cavity of the outer shell body 11. The first insulating member 24 is disposed on the side of the first cover plate body 21 facing the pole group and has a through structure 241 communicating with the connection window 100. One end of the second connecting piece 23 is fixed to the first cover plate body 21 by the second pole post 22, and the other end of the second connecting piece 23 extends to the bottom of the connection window 100. The first cover plate body 21 is disposed on the second surface, and the pole tabs of the second surface are bent so that the pole tabs overlap the surface of the second connecting piece 23 facing the through structure 241. The first insulating member 24 is thermally fused with the insulating film to form an inner shell unit.

[0115] S132C. The housing unit is installed into the cavity of the housing body 11, and the first cover plate body 21 closes the opening of the housing body 11.

[0116] S133C. Spot weld the first cover plate body 21 to the outer shell body 11 to complete the initial connection between the first cover plate module 2 and the outer shell body 11.

[0117] By setting a first cover plate module 2 that is thermally fused to the insulating film on the second surface, the second surface is protected, so that regardless of whether the fixed end plate 4 is set on the first surface, an enclosure unit with at least five-sided protection for the electrode group can be formed, thereby avoiding damage to the electrode group during enclosure.

[0118] In this embodiment, a fixed end plate 4 is provided on the first surface, so that the first surface of the electrode assembly is protected by the fixed end plate 4, and the second surface of the electrode assembly is protected by the first cover plate module 2. Together with the insulating film covering the sides, a housing unit with six-sided protection is formed, which has high protection performance for the electrode assembly. In addition, the first cover plate module 2 is used to close the opening of the outer shell body 11, so that the electrode tabs and the second connecting piece 23 on the second surface are welded after the welding process of the first cover plate body 21 and the outer shell body 11. This avoids the influence of vibration, high temperature and other adverse factors during the welding process on the electrode tabs and the second connecting piece 23 on the second surface that have been welded when the outer shell body 11 is closed, thus improving the welding quality between the second connecting piece 23 and the electrode tabs on the second surface. Furthermore, since the first cover plate module 2 and the outer shell body 11 are in a fixed state, the difficulty of welding the electrode tabs and the second connecting piece 23 on the second surface is reduced.

[0119] Therefore, after the assembly step of Embodiment 5 is completed, a battery structure is formed having a housing module 1 with a connection window 100 opened on the first wall surface 111, a first cover module 2 with a connection window 100 opened on the first cover body 21, and a fixed end plate 4 provided on the first surface. It not only has a housing unit with six-sided protection and high protection, but also ensures that the two side tabs have high welding quality.

[0120] Example 6

[0121] For the sake of simplicity, the same or corresponding parts in Embodiment 6 and Embodiment 5 are referred to by the same reference numerals as in Embodiment 5, and only the differences between Embodiment 6 and Embodiment 5 are described. The difference is that in step S12, the fixed end plate 4 is not provided on the first surface.

[0122] Therefore, after the assembly steps of Embodiment Six are completed, a battery structure is formed with a housing module 1 having a connection window 100 on the first wall surface 111 and a first cover module 2 having a connection window 100 on the first cover body 21, but without a fixed end plate 4. At this time, the first cover module 2 on the second surface and the insulating film form an in-shell unit with five-sided protection. Compared with Embodiment Five, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0123] Example 7

[0124] For the sake of simplicity, the same or corresponding parts in Embodiment 7 are referred to with the same reference numerals as in Embodiment 1. Only the differences between Embodiment 7 and Embodiment 1 are described. The difference is that step S13 in Embodiment 7 is different from step S13 in Embodiment 1.

[0125] In step S13 of this embodiment, when the second cover plate module 5 is thermally fused to the insulating film on the second surface, step S13 includes the following steps:

[0126] S131D, the second cover plate module 5 includes a second cover plate body 51, a second insulating member 53, and a third pole 52. The second insulating member 53 is disposed on the side of the second cover plate body 51 facing the pole group. One end of the third pole 52 is fixedly connected to the second cover plate body 51, and the other end of the third pole 52 passes through the second insulating member 53. The second cover plate body 51 is disposed on the second surface, and the pole tabs on the second surface are bent so that the pole tabs are connected to the end of the third pole 52 that passes through the second insulating member 53. The second insulating member 53 is thermally fused with the insulating film to form an in-shell unit.

[0127] S132D: The housing unit is installed into the cavity of the housing body 11, and the second cover plate body 51 closes the opening of the housing body 11.

[0128] S133D, and spot weld the second cover plate body 51 to the outer shell body 11 to complete the initial connection between the second cover plate module 5 and the outer shell body 11.

[0129] By setting a second cover plate module 5 that is thermally fused to the insulating film on the second surface, the second surface is protected, so that regardless of whether the fixed end plate 4 is set on the first surface, an enclosure unit with at least five-sided protection for the electrode group can be formed, thereby avoiding damage to the electrode group during enclosure.

[0130] In this embodiment, the second cover module 5 is a cover assembly of a traditional blade battery, which can be a traditional welded cover, a riveted cover, or a minimalist cover. In this embodiment, the second cover module 5 is a traditional riveted cover.

[0131] Since the electrode lugs on the other side of the electrode assembly are fixed to the first wall surface 111, the welding quality is improved. Therefore, while ensuring that the electrode lugs on one side of the electrode assembly have high welding quality, the use of the second cover plate module 5 with mature technology to close the opening of the outer shell body 11 helps to control manufacturing costs while improving the welding quality and welding convenience of one side of the electrode lugs.

[0132] In this embodiment, a fixed end plate 4 is provided on the first surface, so that the first surface of the electrode assembly is protected by the fixed end plate 4, and the second surface of the electrode assembly is protected by the second cover plate module 5. Together with the insulating film covering the sides, a housing unit with six-sided protection is formed, which has high protection performance for the electrode assembly. Furthermore, since the second cover plate module 5 is heat-fused to the second surface of the electrode assembly, after the housing unit is installed, the second cover plate module 5 can simultaneously close the opening between the outer shell body 11 and the second surface, thereby reducing the assembly process steps and improving assembly efficiency.

[0133] Therefore, after the assembly steps of Embodiment Seven are completed, a battery structure is formed having a housing module 1 with a connection window 100 opened on the first wall surface 111, a second cover module 5 for closing the opening, and a fixed end plate 4 provided on the first surface. It not only has a housing unit with six-sided protection and high protection, but also ensures that the electrode tab on one side of the electrode group has high welding quality.

[0134] Example 8

[0135] For the sake of simplicity, the same or corresponding parts in Embodiment 8 and Embodiment 7 are referred to by the same reference numerals as in Embodiment 7, and only the differences between Embodiment 8 and Embodiment 7 are described. The difference is that in step S12, the fixed end plate 4 is not provided on the first surface.

[0136] Therefore, after the assembly steps of Embodiment 8 are completed, a battery structure is formed having a housing module 1 with a connection window 100 on the first wall surface 111 and a second cover module 5 for closing the opening, but without a fixed end plate 4. At this time, the second cover module 5 on the second surface and the insulating film form an in-shell unit with five-sided protection. Compared with Embodiment 7, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0137] Optionally, this application also provides a battery assembled using the battery assembly method described above. By applying the battery assembly method described above and improving welding quality, this battery ensures high conductivity, thereby improving power supply capacity and product quality.

[0138] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method of assembling a battery, characterized by, The battery assembled by the battery assembling method comprises a shell module, a cell-in-shell unit and a closing module; The battery assembling method comprises the following steps: S1, the shell module comprises a shell body, a first pole and a first connecting sheet, the shell body is a hollow shell structure with one side open, and comprises a first wall surface opposite to the open side and a plurality of second wall surfaces arranged around the first wall surface, a connecting window in communication with the cavity is formed in the first wall surface, one end of the first connecting sheet is fixed to the first wall surface by the first pole, the other end of the first connecting sheet extends below the connecting window, the cell-in-shell unit comprises a pole group with two side tabs, the cell-in-shell unit is assembled into the cavity of the shell body, and the tabs opposite to the first wall surface are bent to overlap the surface of the first connecting sheet towards the connecting window, and the open side of the shell body is closed; S2, the structure closing the open side of the shell body is finally welded with the shell body; S3, the tabs below the connecting window are welded; S4, the closing module is arranged at the connecting window to close the connecting window; In step S1, the following steps are further included: S11, the pole group comprises a first surface and a second surface provided with the tabs, and a plurality of side surfaces perpendicular to the first surface and the second surface, the first surface is arranged opposite to the first wall surface, and an insulating film is wrapped on the plurality of side surfaces of the pole group; S12, the battery further comprises at least one fixed end plate, the fixed end plate is provided with a avoiding through slot for the tabs to pass through, at most one fixed end plate is arranged on the first surface and is hot melted with the insulating film; S13, the battery further comprises at most one first cover plate module or at most one second cover plate module, at most one fixed end plate, at most one first cover plate module or at most one second cover plate module is arranged on the second surface and is hot melted with the insulating film, so as to form the cell-in-shell unit, the first cover plate module or the second cover plate module is preliminarily welded with the shell body, so as to close the open side of the shell body; In step S13, when the first cover plate module is arranged on the second surface and is hot melted with the insulating film, step S13 further comprises the following steps: S131C, the first cover plate module further comprises a first cover plate body, a second pole column, a second connecting sheet and a first insulating piece, the first cover plate body is provided with the connecting window communicated with the cavity of the shell body, the first insulating piece is arranged on the side of the first cover plate body facing the pole group, and the first insulating piece is provided with a through structure communicated with the connecting window, one end of the second connecting sheet is fixed on the first cover plate body by the second pole column, the other end of the second connecting sheet extends to below the connecting window, the first cover plate body is arranged on the second surface, and the tab of the second surface is bent to be overlapped on the surface of the second connecting sheet facing the through structure, and the first insulating piece is hot-melted with the insulating film to form the shell-in unit; S132C, the shell-in unit is arranged in the cavity of the shell body, and the first cover plate body closes the opening of the shell body; S133C, the first cover plate body is spot-welded with the shell body, and the preliminary connection of the first cover plate module and the shell body is completed; The first surface is not provided with the fixed end plate, and a battery structure without the fixed end plate is formed, which comprises the shell module provided with the connecting window in the first wall surface and the first cover plate module provided with the connecting window in the first cover plate body; In step S13, when the second cover plate module is arranged on the second surface and hot-melted with the insulating film, step S13 further comprises the following steps: S131D, the second cover plate module comprises a second cover plate body, a second insulating piece and a third pole column, the second insulating piece is arranged on the side of the second cover plate body facing the pole group, one end of the third pole column is fixedly connected to the second cover plate body, the other end of the third pole column penetrates through the second insulating piece, the second cover plate body is arranged at the second surface, the tab of the second surface is bent, the tab is connected to one end of the third pole column penetrating through the second insulating piece, and the second insulating piece is hot-melted with the insulating film to form the shell-in unit; S132D, the shell-in unit is arranged in the cavity of the shell body, and the second cover plate body closes the opening of the shell body; S133D, and the second cover plate body is spot-welded with the shell body, and the preliminary connection of the second cover plate module and the shell body is completed; The first surface is not provided with the fixed end plate, and a battery structure without the fixed end plate is formed, which comprises the shell module provided with the connecting window in the first wall surface and the second cover plate module for closing the opening; The closing module comprises a closing plate and an insulating plate, and in step S4, the following steps are further included: S41, the first cover plate body, and / or the first wall surface away from the side of the pole group is provided with a mounting boss, the mounting boss is provided with a mounting through hole which is communicated with the connecting window and is distributed in steps, and a limiting step is formed between the mounting through hole and the connecting window, the closure plate includes a closure part and a plug-in part, the insulation plate is arranged on the side of the plug-in part away from the closure part, the plug-in part of the closure plate is inserted into the connecting window, the closure part of the closure plate is inserted into the mounting through hole, and the closure part is abutted with the limiting step; S42, the closure part is welded with the first cover plate body, and / or the first wall surface, the width dimension of the limiting step and the closure part overlapping in the first direction is W, when the closure part is butt welding with the first cover plate body, and / or the first wall surface, the width dimension W satisfies 0.5mm≤W≤20mm; When the closure part is penetration welding with the first cover plate body, and / or the first wall surface, the width dimension W satisfies 1mm≤W≤20mm.

2. The battery assembling method according to claim 1, wherein In step S13, when the fixed end plate is arranged on the second surface and the insulation film is hot melting, and the first cover plate module is used to close the opening of the shell body, step S13 includes the following steps: S131A, the fixed end plate is arranged on the second surface and the insulation film is hot melting, and the tab on the second surface passes through the avoiding through slot of the fixed end plate, so as to form the shell entering unit; S132A, the shell entering unit is arranged in the cavity of the shell body; S133A, the first cover plate module includes a first cover plate body, a second pole column and a second connecting piece, the first cover plate body is provided with the connecting window which is communicated with the cavity of the shell body, one end of the second connecting piece is fixed on the first cover plate body by the second pole column, the other end of the second connecting piece extends below the connecting window, the first cover plate module is arranged on the side of the fixed end plate away from the pole group, and the tab of the second surface passing through the avoiding through slot is bent, so that the tab is overlapped on the surface of the second connecting piece facing the connecting window; S134A, the first cover plate body is spot welded with the shell body, and the preliminary connection of the first cover plate module and the shell body is completed.

3. The battery assembly method of claim 1, wherein, In step S13, when the fixed end plate is arranged on the second surface and the insulation film is hot melting, and the second cover plate module is used to close the opening of the shell body, step S13 includes the following steps: S131B, the fixed end plate is arranged on the second surface and the insulation film is hot melting, and the tab on the second surface passes through the avoiding through slot of the fixed end plate, so as to form the shell entering unit; S132B, the shell entering unit is arranged in the cavity of the shell body; S133B, the second cover plate module includes a second cover plate body and a third pole post, the third pole post is fixedly connected on the second cover plate body, the second cover plate module is arranged on the side of the fixed end plate away from the pole group, and the second surface is bent through the pole lug of the avoiding through slot, so that the pole lug is connected to the side of the third pole post facing the pole group; S134B, the second cover plate body is spot welded with the shell body, and the preliminary connection of the second cover plate module and the shell body is completed.

4. The battery assembly method of claim 1, wherein, In step S11, the following steps are further included: S111, the battery further includes at least one protective side plate, and at least one protective side plate is pre-hot-melted at a set position of the insulating film; S112, the insulating film is wrapped around the plurality of side surfaces of the pole group, and at least one protective side plate covers one of the side surfaces of the pole group.

5. A battery characterized by The battery is assembled by using the battery assembling method according to any one of claims 1-4.

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